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* [PATCH v6 00/24] x86/resctrl: Merge the CDP resources
@ 2021-07-15 17:30 James Morse
  2021-07-15 17:30 ` [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource James Morse
                   ` (23 more replies)
  0 siblings, 24 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Hi folks,

Changes since v5? Nothing: just picked up the tags, (rebased and retested).
---

This series re-folds the resctrl code so the CDP resources (L3CODE et al)
behaviour is all contained in the filesystem parts, with a minimum amount
of arch specific code.

Arm have some CPU support for dividing caches into portions, and
applying bandwidth limits at various points in the SoC. The collective term
for these features is MPAM: Memory Partitioning and Monitoring.

MPAM is similar enough to Intel RDT, that it should use the defacto linux
interface: resctrl. This filesystem currently lives under arch/x86, and is
tightly coupled to the architecture.
Ultimately, my plan is to split the existing resctrl code up to have an
arch<->fs abstraction, then move all the bits out to fs/resctrl. From there
MPAM can be wired up.

x86 might have two resources with cache controls, (L2 and L3) but has
extra copies for CDP: L{2,3}{CODE,DATA}, which are marked as enabled
if CDP is enabled for the corresponding cache.

MPAM has an equivalent feature to CDP, but its a property of the CPU,
not the cache. Resctrl needs to have x86's odd/even behaviour, as that
its the ABI, but this isn't how the MPAM hardware works. It is entirely
possible that an in-kernel user of MPAM would not be using CDP, whereas
resctrl is.

Pretending L3CODE and L3DATA are entirely separate resources is a neat
trick, but doing this is specific to x86.
Doing this leaves the arch code in control of various parts of the
filesystem ABI: the resources names, and the way the schemata are parsed.
Allowing this stuff to vary between architectures is bad for user space.

This series collapses the CODE/DATA resources, moving all the user-visible
resctrl ABI into what becomes the filesystem code. CDP becomes the type of
configuration being applied to a cache. This is done by adding a
struct resctrl_schema to the parts of resctrl that will move to fs. This
holds the arch-code resource that is in use for this schema, along with
other properties like the name, and whether the configuration being applied
is CODE/DATA/BOTH.

This lets us fold the extra resources out of the arch code so that they
don't need to be duplicated if the equivalent feature to CDP is missing, or
implemented in a different way.


The first two patches split the resource and domain structs to have an
arch specific 'hw' portion, and the rest that is visible to resctrl.
Future series massage the resctrl code so there are no accesses to 'hw'
structures in the parts of resctrl that will move to fs, providing helpers
where necessary.

This series adds temporary scaffolding, which it removes a few patches
later. This is to allow things like the ctrlval arrays and resources to be
merged separately, which should make is easier to bisect. These things
are marked temporary, and should all be gone by the end of the series.

This series is a little rough around the monitors, would a fake
struct resctrl_schema for the monitors simplify things, or be a source
of bugs?

A side effect of merging these resources, is their names are no longer printed
in the kernel log at boot. e.g:
| resctrl: L3 allocation detected
| resctrl: MB allocation detected
| resctrl: L3 monitoring detected
would previously have had extra entries for 'L3CODE' and 'L3DATA'.
User-space cannot rely on this to discover CDP support, as the kernel log may
be inaccessible, may have been overwritten by newer messages, and because
parsing the kernel log is a bad idea.


This series is based on v5.14-rc1, and can be retrieved from:
git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/resctrl_merge_cdp/v6

v5: https://lore.kernel.org/lkml/20210617175820.24037-1-james.morse@arm.com/
v4: https://lore.kernel.org/lkml/20210614200941.12383-1-james.morse@arm.com/
v3: https://lore.kernel.org/lkml/20210519162424.27654-1-james.morse@arm.com/
v2: https://lore.kernel.org/lkml/20210312175849.8327-1-james.morse@arm.com/
v1: https://lore.kernel.org/lkml/20201030161120.227225-1-james.morse@arm.com/

Parts were previously posted as an RFC here:
https://lore.kernel.org/lkml/20200214182947.39194-1-james.morse@arm.com/


Thanks,

James Morse (24):
  x86/resctrl: Split struct rdt_resource
  x86/resctrl: Split struct rdt_domain
  x86/resctrl: Add a separate schema list for resctrl
  x86/resctrl: Pass the schema in info dir's private pointer
  x86/resctrl: Label the resources with their configuration type
  x86/resctrl: Walk the resctrl schema list instead of an arch list
  x86/resctrl: Store the effective num_closid in the schema
  x86/resctrl: Add resctrl_arch_get_num_closid()
  x86/resctrl: Pass the schema to resctrl filesystem functions
  x86/resctrl: Swizzle rdt_resource and resctrl_schema in
    pseudo_lock_region
  x86/resctrl: Add a helper to read/set the CDP configuration
  x86/resctrl: Move the schemata names into struct resctrl_schema
  x86/resctrl: Group staged configuration into a separate struct
  x86/resctrl: Allow different CODE/DATA configurations to be staged
  x86/resctrl: Rename update_domains() resctrl_arch_update_domains()
  x86/resctrl: Add a helper to read a closid's configuration
  x86/resctrl: Pass configuration type to resctrl_arch_get_config()
  x86/resctrl: Make ctrlval arrays the same size
  x86/resctrl: Apply offset correction when config is staged
  x86/resctrl: Calculate the index from the configuration type
  x86/resctrl: Merge the ctrl_val arrays
  x86/resctrl: Remove rdt_cdp_peer_get()
  x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range
  x86/resctrl: Merge the CDP resources

 arch/x86/kernel/cpu/resctrl/core.c        | 276 ++++++-------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 164 +++++---
 arch/x86/kernel/cpu/resctrl/internal.h    | 232 ++++-------
 arch/x86/kernel/cpu/resctrl/monitor.c     |  44 ++-
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  12 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 459 ++++++++++++----------
 include/linux/resctrl.h                   | 185 +++++++++
 7 files changed, 776 insertions(+), 596 deletions(-)

-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-28 16:17   ` James Morse
  2021-07-15 17:30 ` [PATCH v6 02/24] x86/resctrl: Split struct rdt_domain James Morse
                   ` (22 subsequent siblings)
  23 siblings, 1 reply; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

resctrl is the defacto Linux ABI for SoC resource partitioning features.

To support it on another architecture, it needs to be abstracted from
the features provided by Intel RDT and AMD PQoS, and moved to /fs/.
struct rdt_resource contains a mix of architecture private details
and properties of the filesystem interface user-space uses.

Start by splitting struct rdt_resource, into an architecture private
'hw' struct, which contains the common resctrl structure that would be
used by any architecture. The foreach helpers are most commonly used by
the filesystem code, and should return the common resctrl structure.
for_each_rdt_resource() is changed to walk the common structure in its
parent arch private structure.
Move as much of the structure as possible into the common structure
in the core code's header file. The x86 hardware accessors remain
part of the architecture private code, as do num_closid, mon_scale
and mbm_width.
mon_scale and mbm_width are used to detect overflow of the hardware
counters, and convert them from their native size to bytes. Any
cross-architecture abstraction should be in terms of bytes, making
these properties private.
The hardware's num_closid is kept in the private structure to force
the filesystem code to use a helper to access it. MPAM would return a
single value for the system, regardless of the resource. Using the
helper prevents this field from being confused with the version of
num_closid that is being exposed to user-space (added in a later patch).
After this split, filesytsem code touching a 'hw' struct indicates
where an abstraction is needed.

Splitting this structure only moves types around, and should not lead
to any change in behaviour.

Splitting rdt_domain up in a similar way happens in the next patch.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Renamed struct member 'r_resctrl'.

Changes since v3:
 * Fixed a spelling mistake

Changes since v2:
 * Added a comment above for_each_rdt_resources()
 * Expanded kerneldoc for rdt_hw_resource

Changes since v1:
 * Tabs space and other whitespace
 * Restored for_each_rdt_resource() calls in arch code
---
 arch/x86/kernel/cpu/resctrl/core.c        | 257 +++++++++++++---------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  14 +-
 arch/x86/kernel/cpu/resctrl/internal.h    | 150 ++++---------
 arch/x86/kernel/cpu/resctrl/monitor.c     |  32 +--
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |   4 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  68 +++---
 include/linux/resctrl.h                   | 110 +++++++++
 7 files changed, 363 insertions(+), 272 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 23001ae03e82..942d070aa92c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -57,120 +57,134 @@ static void
 mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
 	      struct rdt_resource *r);
 
-#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains)
+#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.domains)
 
-struct rdt_resource rdt_resources_all[] = {
+struct rdt_hw_resource rdt_resources_all[] = {
 	[RDT_RESOURCE_L3] =
 	{
-		.rid			= RDT_RESOURCE_L3,
-		.name			= "L3",
-		.domains		= domain_init(RDT_RESOURCE_L3),
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L3,
+			.name			= "L3",
+			.cache_level		= 3,
+			.cache = {
+				.min_cbm_bits	= 1,
+				.cbm_idx_mult	= 1,
+				.cbm_idx_offset	= 0,
+			},
+			.domains		= domain_init(RDT_RESOURCE_L3),
+			.parse_ctrlval		= parse_cbm,
+			.format_str		= "%d=%0*x",
+			.fflags			= RFTYPE_RES_CACHE,
+		},
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
 		.msr_update		= cat_wrmsr,
-		.cache_level		= 3,
-		.cache = {
-			.min_cbm_bits	= 1,
-			.cbm_idx_mult	= 1,
-			.cbm_idx_offset	= 0,
-		},
-		.parse_ctrlval		= parse_cbm,
-		.format_str		= "%d=%0*x",
-		.fflags			= RFTYPE_RES_CACHE,
 	},
 	[RDT_RESOURCE_L3DATA] =
 	{
-		.rid			= RDT_RESOURCE_L3DATA,
-		.name			= "L3DATA",
-		.domains		= domain_init(RDT_RESOURCE_L3DATA),
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L3DATA,
+			.name			= "L3DATA",
+			.cache_level		= 3,
+			.cache = {
+				.min_cbm_bits	= 1,
+				.cbm_idx_mult	= 2,
+				.cbm_idx_offset	= 0,
+			},
+			.domains		= domain_init(RDT_RESOURCE_L3DATA),
+			.parse_ctrlval		= parse_cbm,
+			.format_str		= "%d=%0*x",
+			.fflags			= RFTYPE_RES_CACHE,
+		},
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
 		.msr_update		= cat_wrmsr,
-		.cache_level		= 3,
-		.cache = {
-			.min_cbm_bits	= 1,
-			.cbm_idx_mult	= 2,
-			.cbm_idx_offset	= 0,
-		},
-		.parse_ctrlval		= parse_cbm,
-		.format_str		= "%d=%0*x",
-		.fflags			= RFTYPE_RES_CACHE,
 	},
 	[RDT_RESOURCE_L3CODE] =
 	{
-		.rid			= RDT_RESOURCE_L3CODE,
-		.name			= "L3CODE",
-		.domains		= domain_init(RDT_RESOURCE_L3CODE),
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L3CODE,
+			.name			= "L3CODE",
+			.cache_level		= 3,
+			.cache = {
+				.min_cbm_bits	= 1,
+				.cbm_idx_mult	= 2,
+				.cbm_idx_offset	= 1,
+			},
+			.domains		= domain_init(RDT_RESOURCE_L3CODE),
+			.parse_ctrlval		= parse_cbm,
+			.format_str		= "%d=%0*x",
+			.fflags			= RFTYPE_RES_CACHE,
+		},
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
 		.msr_update		= cat_wrmsr,
-		.cache_level		= 3,
-		.cache = {
-			.min_cbm_bits	= 1,
-			.cbm_idx_mult	= 2,
-			.cbm_idx_offset	= 1,
-		},
-		.parse_ctrlval		= parse_cbm,
-		.format_str		= "%d=%0*x",
-		.fflags			= RFTYPE_RES_CACHE,
 	},
 	[RDT_RESOURCE_L2] =
 	{
-		.rid			= RDT_RESOURCE_L2,
-		.name			= "L2",
-		.domains		= domain_init(RDT_RESOURCE_L2),
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L2,
+			.name			= "L2",
+			.cache_level		= 2,
+			.cache = {
+				.min_cbm_bits	= 1,
+				.cbm_idx_mult	= 1,
+				.cbm_idx_offset	= 0,
+			},
+			.domains		= domain_init(RDT_RESOURCE_L2),
+			.parse_ctrlval		= parse_cbm,
+			.format_str		= "%d=%0*x",
+			.fflags			= RFTYPE_RES_CACHE,
+		},
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
 		.msr_update		= cat_wrmsr,
-		.cache_level		= 2,
-		.cache = {
-			.min_cbm_bits	= 1,
-			.cbm_idx_mult	= 1,
-			.cbm_idx_offset	= 0,
-		},
-		.parse_ctrlval		= parse_cbm,
-		.format_str		= "%d=%0*x",
-		.fflags			= RFTYPE_RES_CACHE,
 	},
 	[RDT_RESOURCE_L2DATA] =
 	{
-		.rid			= RDT_RESOURCE_L2DATA,
-		.name			= "L2DATA",
-		.domains		= domain_init(RDT_RESOURCE_L2DATA),
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L2DATA,
+			.name			= "L2DATA",
+			.cache_level		= 2,
+			.cache = {
+				.min_cbm_bits	= 1,
+				.cbm_idx_mult	= 2,
+				.cbm_idx_offset	= 0,
+			},
+			.domains		= domain_init(RDT_RESOURCE_L2DATA),
+			.parse_ctrlval		= parse_cbm,
+			.format_str		= "%d=%0*x",
+			.fflags			= RFTYPE_RES_CACHE,
+		},
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
 		.msr_update		= cat_wrmsr,
-		.cache_level		= 2,
-		.cache = {
-			.min_cbm_bits	= 1,
-			.cbm_idx_mult	= 2,
-			.cbm_idx_offset	= 0,
-		},
-		.parse_ctrlval		= parse_cbm,
-		.format_str		= "%d=%0*x",
-		.fflags			= RFTYPE_RES_CACHE,
 	},
 	[RDT_RESOURCE_L2CODE] =
 	{
-		.rid			= RDT_RESOURCE_L2CODE,
-		.name			= "L2CODE",
-		.domains		= domain_init(RDT_RESOURCE_L2CODE),
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L2CODE,
+			.name			= "L2CODE",
+			.cache_level		= 2,
+			.cache = {
+				.min_cbm_bits	= 1,
+				.cbm_idx_mult	= 2,
+				.cbm_idx_offset	= 1,
+			},
+			.domains		= domain_init(RDT_RESOURCE_L2CODE),
+			.parse_ctrlval		= parse_cbm,
+			.format_str		= "%d=%0*x",
+			.fflags			= RFTYPE_RES_CACHE,
+		},
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
 		.msr_update		= cat_wrmsr,
-		.cache_level		= 2,
-		.cache = {
-			.min_cbm_bits	= 1,
-			.cbm_idx_mult	= 2,
-			.cbm_idx_offset	= 1,
-		},
-		.parse_ctrlval		= parse_cbm,
-		.format_str		= "%d=%0*x",
-		.fflags			= RFTYPE_RES_CACHE,
 	},
 	[RDT_RESOURCE_MBA] =
 	{
-		.rid			= RDT_RESOURCE_MBA,
-		.name			= "MB",
-		.domains		= domain_init(RDT_RESOURCE_MBA),
-		.cache_level		= 3,
-		.parse_ctrlval		= parse_bw,
-		.format_str		= "%d=%*u",
-		.fflags			= RFTYPE_RES_MB,
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_MBA,
+			.name			= "MB",
+			.cache_level		= 3,
+			.domains		= domain_init(RDT_RESOURCE_MBA),
+			.parse_ctrlval		= parse_bw,
+			.format_str		= "%d=%*u",
+			.fflags			= RFTYPE_RES_MB,
+		},
 	},
 };
 
@@ -199,7 +213,8 @@ static unsigned int cbm_idx(struct rdt_resource *r, unsigned int closid)
  */
 static inline void cache_alloc_hsw_probe(void)
 {
-	struct rdt_resource *r  = &rdt_resources_all[RDT_RESOURCE_L3];
+	struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_L3];
+	struct rdt_resource *r  = &hw_res->r_resctrl;
 	u32 l, h, max_cbm = BIT_MASK(20) - 1;
 
 	if (wrmsr_safe(MSR_IA32_L3_CBM_BASE, max_cbm, 0))
@@ -211,7 +226,7 @@ static inline void cache_alloc_hsw_probe(void)
 	if (l != max_cbm)
 		return;
 
-	r->num_closid = 4;
+	hw_res->num_closid = 4;
 	r->default_ctrl = max_cbm;
 	r->cache.cbm_len = 20;
 	r->cache.shareable_bits = 0xc0000;
@@ -225,7 +240,7 @@ static inline void cache_alloc_hsw_probe(void)
 bool is_mba_sc(struct rdt_resource *r)
 {
 	if (!r)
-		return rdt_resources_all[RDT_RESOURCE_MBA].membw.mba_sc;
+		return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.mba_sc;
 
 	return r->membw.mba_sc;
 }
@@ -253,12 +268,13 @@ static inline bool rdt_get_mb_table(struct rdt_resource *r)
 
 static bool __get_mem_config_intel(struct rdt_resource *r)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	union cpuid_0x10_3_eax eax;
 	union cpuid_0x10_x_edx edx;
 	u32 ebx, ecx, max_delay;
 
 	cpuid_count(0x00000010, 3, &eax.full, &ebx, &ecx, &edx.full);
-	r->num_closid = edx.split.cos_max + 1;
+	hw_res->num_closid = edx.split.cos_max + 1;
 	max_delay = eax.split.max_delay + 1;
 	r->default_ctrl = MAX_MBA_BW;
 	r->membw.arch_needs_linear = true;
@@ -287,12 +303,13 @@ static bool __get_mem_config_intel(struct rdt_resource *r)
 
 static bool __rdt_get_mem_config_amd(struct rdt_resource *r)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	union cpuid_0x10_3_eax eax;
 	union cpuid_0x10_x_edx edx;
 	u32 ebx, ecx;
 
 	cpuid_count(0x80000020, 1, &eax.full, &ebx, &ecx, &edx.full);
-	r->num_closid = edx.split.cos_max + 1;
+	hw_res->num_closid = edx.split.cos_max + 1;
 	r->default_ctrl = MAX_MBA_BW_AMD;
 
 	/* AMD does not use delay */
@@ -317,12 +334,13 @@ static bool __rdt_get_mem_config_amd(struct rdt_resource *r)
 
 static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	union cpuid_0x10_1_eax eax;
 	union cpuid_0x10_x_edx edx;
 	u32 ebx, ecx;
 
 	cpuid_count(0x00000010, idx, &eax.full, &ebx, &ecx, &edx.full);
-	r->num_closid = edx.split.cos_max + 1;
+	hw_res->num_closid = edx.split.cos_max + 1;
 	r->cache.cbm_len = eax.split.cbm_len + 1;
 	r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
 	r->cache.shareable_bits = ebx & r->default_ctrl;
@@ -333,10 +351,12 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 
 static void rdt_get_cdp_config(int level, int type)
 {
-	struct rdt_resource *r_l = &rdt_resources_all[level];
-	struct rdt_resource *r = &rdt_resources_all[type];
+	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
+	struct rdt_hw_resource *hw_res_l = resctrl_to_arch_res(r_l);
+	struct rdt_resource *r = &rdt_resources_all[type].r_resctrl;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
-	r->num_closid = r_l->num_closid / 2;
+	hw_res->num_closid = hw_res_l->num_closid / 2;
 	r->cache.cbm_len = r_l->cache.cbm_len;
 	r->default_ctrl = r_l->default_ctrl;
 	r->cache.shareable_bits = r_l->cache.shareable_bits;
@@ -365,9 +385,10 @@ static void
 mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 {
 	unsigned int i;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(r->msr_base + i, d->ctrl_val[i]);
+		wrmsrl(hw_res->msr_base + i, d->ctrl_val[i]);
 }
 
 /*
@@ -389,19 +410,21 @@ mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
 		struct rdt_resource *r)
 {
 	unsigned int i;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	/*  Write the delay values for mba. */
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(r->msr_base + i, delay_bw_map(d->ctrl_val[i], r));
+		wrmsrl(hw_res->msr_base + i, delay_bw_map(d->ctrl_val[i], r));
 }
 
 static void
 cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 {
 	unsigned int i;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(r->msr_base + cbm_idx(r, i), d->ctrl_val[i]);
+		wrmsrl(hw_res->msr_base + cbm_idx(r, i), d->ctrl_val[i]);
 }
 
 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
@@ -420,13 +443,14 @@ struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
 void rdt_ctrl_update(void *arg)
 {
 	struct msr_param *m = arg;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
 	struct rdt_resource *r = m->res;
 	int cpu = smp_processor_id();
 	struct rdt_domain *d;
 
 	d = get_domain_from_cpu(cpu, r);
 	if (d) {
-		r->msr_update(d, m, r);
+		hw_res->msr_update(d, m, r);
 		return;
 	}
 	pr_warn_once("cpu %d not found in any domain for resource %s\n",
@@ -468,6 +492,7 @@ struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
 
 void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	int i;
 
 	/*
@@ -476,7 +501,7 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
 	 * For Memory Allocation: Set b/w requested to 100%
 	 * and the bandwidth in MBps to U32_MAX
 	 */
-	for (i = 0; i < r->num_closid; i++, dc++, dm++) {
+	for (i = 0; i < hw_res->num_closid; i++, dc++, dm++) {
 		*dc = r->default_ctrl;
 		*dm = MBA_MAX_MBPS;
 	}
@@ -484,14 +509,15 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
 
 static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	struct msr_param m;
 	u32 *dc, *dm;
 
-	dc = kmalloc_array(r->num_closid, sizeof(*d->ctrl_val), GFP_KERNEL);
+	dc = kmalloc_array(hw_res->num_closid, sizeof(*d->ctrl_val), GFP_KERNEL);
 	if (!dc)
 		return -ENOMEM;
 
-	dm = kmalloc_array(r->num_closid, sizeof(*d->mbps_val), GFP_KERNEL);
+	dm = kmalloc_array(hw_res->num_closid, sizeof(*d->mbps_val), GFP_KERNEL);
 	if (!dm) {
 		kfree(dc);
 		return -ENOMEM;
@@ -502,8 +528,8 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 	setup_default_ctrlval(r, dc, dm);
 
 	m.low = 0;
-	m.high = r->num_closid;
-	r->msr_update(d, &m, r);
+	m.high = hw_res->num_closid;
+	hw_res->msr_update(d, &m, r);
 	return 0;
 }
 
@@ -655,7 +681,7 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	if (r == &rdt_resources_all[RDT_RESOURCE_L3]) {
+	if (r == &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl) {
 		if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
 			cancel_delayed_work(&d->mbm_over);
 			mbm_setup_overflow_handler(d, 0);
@@ -827,19 +853,22 @@ static bool __init rdt_cpu_has(int flag)
 
 static __init bool get_mem_config(void)
 {
+	struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_MBA];
+
 	if (!rdt_cpu_has(X86_FEATURE_MBA))
 		return false;
 
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
-		return __get_mem_config_intel(&rdt_resources_all[RDT_RESOURCE_MBA]);
+		return __get_mem_config_intel(&hw_res->r_resctrl);
 	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
-		return __rdt_get_mem_config_amd(&rdt_resources_all[RDT_RESOURCE_MBA]);
+		return __rdt_get_mem_config_amd(&hw_res->r_resctrl);
 
 	return false;
 }
 
 static __init bool get_rdt_alloc_resources(void)
 {
+	struct rdt_resource *r;
 	bool ret = false;
 
 	if (rdt_alloc_capable)
@@ -849,14 +878,16 @@ static __init bool get_rdt_alloc_resources(void)
 		return false;
 
 	if (rdt_cpu_has(X86_FEATURE_CAT_L3)) {
-		rdt_get_cache_alloc_cfg(1, &rdt_resources_all[RDT_RESOURCE_L3]);
+		r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+		rdt_get_cache_alloc_cfg(1, r);
 		if (rdt_cpu_has(X86_FEATURE_CDP_L3))
 			rdt_get_cdp_l3_config();
 		ret = true;
 	}
 	if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
 		/* CPUID 0x10.2 fields are same format at 0x10.1 */
-		rdt_get_cache_alloc_cfg(2, &rdt_resources_all[RDT_RESOURCE_L2]);
+		r = &rdt_resources_all[RDT_RESOURCE_L2].r_resctrl;
+		rdt_get_cache_alloc_cfg(2, r);
 		if (rdt_cpu_has(X86_FEATURE_CDP_L2))
 			rdt_get_cdp_l2_config();
 		ret = true;
@@ -870,6 +901,8 @@ static __init bool get_rdt_alloc_resources(void)
 
 static __init bool get_rdt_mon_resources(void)
 {
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+
 	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
 		rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
 	if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
@@ -880,7 +913,7 @@ static __init bool get_rdt_mon_resources(void)
 	if (!rdt_mon_features)
 		return false;
 
-	return !rdt_get_mon_l3_config(&rdt_resources_all[RDT_RESOURCE_L3]);
+	return !rdt_get_mon_l3_config(r);
 }
 
 static __init void __check_quirks_intel(void)
@@ -918,9 +951,12 @@ static __init bool get_rdt_resources(void)
 
 static __init void rdt_init_res_defs_intel(void)
 {
+	struct rdt_hw_resource *hw_res;
 	struct rdt_resource *r;
 
 	for_each_rdt_resource(r) {
+		hw_res = resctrl_to_arch_res(r);
+
 		if (r->rid == RDT_RESOURCE_L3 ||
 		    r->rid == RDT_RESOURCE_L3DATA ||
 		    r->rid == RDT_RESOURCE_L3CODE ||
@@ -931,17 +967,20 @@ static __init void rdt_init_res_defs_intel(void)
 			r->cache.arch_has_empty_bitmaps = false;
 			r->cache.arch_has_per_cpu_cfg = false;
 		} else if (r->rid == RDT_RESOURCE_MBA) {
-			r->msr_base = MSR_IA32_MBA_THRTL_BASE;
-			r->msr_update = mba_wrmsr_intel;
+			hw_res->msr_base = MSR_IA32_MBA_THRTL_BASE;
+			hw_res->msr_update = mba_wrmsr_intel;
 		}
 	}
 }
 
 static __init void rdt_init_res_defs_amd(void)
 {
+	struct rdt_hw_resource *hw_res;
 	struct rdt_resource *r;
 
 	for_each_rdt_resource(r) {
+		hw_res = resctrl_to_arch_res(r);
+
 		if (r->rid == RDT_RESOURCE_L3 ||
 		    r->rid == RDT_RESOURCE_L3DATA ||
 		    r->rid == RDT_RESOURCE_L3CODE ||
@@ -952,8 +991,8 @@ static __init void rdt_init_res_defs_amd(void)
 			r->cache.arch_has_empty_bitmaps = true;
 			r->cache.arch_has_per_cpu_cfg = true;
 		} else if (r->rid == RDT_RESOURCE_MBA) {
-			r->msr_base = MSR_IA32_MBA_BW_BASE;
-			r->msr_update = mba_wrmsr_amd;
+			hw_res->msr_base = MSR_IA32_MBA_BW_BASE;
+			hw_res->msr_update = mba_wrmsr_amd;
 		}
 	}
 }
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index c877642e8a14..3f0c33d5b658 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -284,10 +284,12 @@ int update_domains(struct rdt_resource *r, int closid)
 static int rdtgroup_parse_resource(char *resname, char *tok,
 				   struct rdtgroup *rdtgrp)
 {
+	struct rdt_hw_resource *hw_res;
 	struct rdt_resource *r;
 
 	for_each_alloc_enabled_rdt_resource(r) {
-		if (!strcmp(resname, r->name) && rdtgrp->closid < r->num_closid)
+		hw_res = resctrl_to_arch_res(r);
+		if (!strcmp(resname, r->name) && rdtgrp->closid < hw_res->num_closid)
 			return parse_line(tok, r, rdtgrp);
 	}
 	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
@@ -394,6 +396,7 @@ static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v)
 {
+	struct rdt_hw_resource *hw_res;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
 	int ret = 0;
@@ -418,7 +421,8 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 		} else {
 			closid = rdtgrp->closid;
 			for_each_alloc_enabled_rdt_resource(r) {
-				if (closid < r->num_closid)
+				hw_res = resctrl_to_arch_res(r);
+				if (closid < hw_res->num_closid)
 					show_doms(s, r, closid);
 			}
 		}
@@ -449,6 +453,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 {
 	struct kernfs_open_file *of = m->private;
+	struct rdt_hw_resource *hw_res;
 	u32 resid, evtid, domid;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
@@ -468,7 +473,8 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	domid = md.u.domid;
 	evtid = md.u.evtid;
 
-	r = &rdt_resources_all[resid];
+	hw_res = &rdt_resources_all[resid];
+	r = &hw_res->r_resctrl;
 	d = rdt_find_domain(r, domid, NULL);
 	if (IS_ERR_OR_NULL(d)) {
 		ret = -ENOENT;
@@ -482,7 +488,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	else if (rr.val & RMID_VAL_UNAVAIL)
 		seq_puts(m, "Unavailable\n");
 	else
-		seq_printf(m, "%llu\n", rr.val * r->mon_scale);
+		seq_printf(m, "%llu\n", rr.val * hw_res->mon_scale);
 
 out:
 	rdtgroup_kn_unlock(of->kn);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 6a5f60a37219..88d71c889328 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -2,6 +2,7 @@
 #ifndef _ASM_X86_RESCTRL_INTERNAL_H
 #define _ASM_X86_RESCTRL_INTERNAL_H
 
+#include <linux/resctrl.h>
 #include <linux/sched.h>
 #include <linux/kernfs.h>
 #include <linux/fs_context.h>
@@ -353,67 +354,6 @@ struct msr_param {
 	int			high;
 };
 
-/**
- * struct rdt_cache - Cache allocation related data
- * @cbm_len:		Length of the cache bit mask
- * @min_cbm_bits:	Minimum number of consecutive bits to be set
- * @cbm_idx_mult:	Multiplier of CBM index
- * @cbm_idx_offset:	Offset of CBM index. CBM index is computed by:
- *			closid * cbm_idx_multi + cbm_idx_offset
- *			in a cache bit mask
- * @shareable_bits:	Bitmask of shareable resource with other
- *			executing entities
- * @arch_has_sparse_bitmaps:	True if a bitmap like f00f is valid.
- * @arch_has_empty_bitmaps:	True if the '0' bitmap is valid.
- * @arch_has_per_cpu_cfg:	True if QOS_CFG register for this cache
- *				level has CPU scope.
- */
-struct rdt_cache {
-	unsigned int	cbm_len;
-	unsigned int	min_cbm_bits;
-	unsigned int	cbm_idx_mult;
-	unsigned int	cbm_idx_offset;
-	unsigned int	shareable_bits;
-	bool		arch_has_sparse_bitmaps;
-	bool		arch_has_empty_bitmaps;
-	bool		arch_has_per_cpu_cfg;
-};
-
-/**
- * enum membw_throttle_mode - System's memory bandwidth throttling mode
- * @THREAD_THROTTLE_UNDEFINED:	Not relevant to the system
- * @THREAD_THROTTLE_MAX:	Memory bandwidth is throttled at the core
- *				always using smallest bandwidth percentage
- *				assigned to threads, aka "max throttling"
- * @THREAD_THROTTLE_PER_THREAD:	Memory bandwidth is throttled at the thread
- */
-enum membw_throttle_mode {
-	THREAD_THROTTLE_UNDEFINED = 0,
-	THREAD_THROTTLE_MAX,
-	THREAD_THROTTLE_PER_THREAD,
-};
-
-/**
- * struct rdt_membw - Memory bandwidth allocation related data
- * @min_bw:		Minimum memory bandwidth percentage user can request
- * @bw_gran:		Granularity at which the memory bandwidth is allocated
- * @delay_linear:	True if memory B/W delay is in linear scale
- * @arch_needs_linear:	True if we can't configure non-linear resources
- * @throttle_mode:	Bandwidth throttling mode when threads request
- *			different memory bandwidths
- * @mba_sc:		True if MBA software controller(mba_sc) is enabled
- * @mb_map:		Mapping of memory B/W percentage to memory B/W delay
- */
-struct rdt_membw {
-	u32				min_bw;
-	u32				bw_gran;
-	u32				delay_linear;
-	bool				arch_needs_linear;
-	enum membw_throttle_mode	throttle_mode;
-	bool				mba_sc;
-	u32				*mb_map;
-};
-
 static inline bool is_llc_occupancy_enabled(void)
 {
 	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
@@ -446,58 +386,33 @@ struct rdt_parse_data {
 };
 
 /**
- * struct rdt_resource - attributes of an RDT resource
- * @rid:		The index of the resource
- * @alloc_enabled:	Is allocation enabled on this machine
- * @mon_enabled:	Is monitoring enabled for this feature
- * @alloc_capable:	Is allocation available on this machine
- * @mon_capable:	Is monitor feature available on this machine
- * @name:		Name to use in "schemata" file
- * @num_closid:		Number of CLOSIDs available
- * @cache_level:	Which cache level defines scope of this resource
- * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
+ * struct rdt_hw_resource - arch private attributes of a resctrl resource
+ * @r_resctrl:		Attributes of the resource used directly by resctrl.
+ * @num_closid:		Maximum number of closid this hardware can support.
  * @msr_base:		Base MSR address for CBMs
  * @msr_update:		Function pointer to update QOS MSRs
- * @data_width:		Character width of data when displaying
- * @domains:		All domains for this resource
- * @cache:		Cache allocation related data
- * @membw:		If the component has bandwidth controls, their properties.
- * @format_str:		Per resource format string to show domain value
- * @parse_ctrlval:	Per resource function pointer to parse control values
- * @evt_list:		List of monitoring events
- * @num_rmid:		Number of RMIDs available
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
  * @mbm_width:		Monitor width, to detect and correct for overflow.
- * @fflags:		flags to choose base and info files
+ *
+ * Members of this structure are either private to the architecture
+ * e.g. mbm_width, or accessed via helpers that provide abstraction. e.g.
+ * msr_update and msr_base.
  */
-struct rdt_resource {
-	int			rid;
-	bool			alloc_enabled;
-	bool			mon_enabled;
-	bool			alloc_capable;
-	bool			mon_capable;
-	char			*name;
+struct rdt_hw_resource {
+	struct rdt_resource	r_resctrl;
 	int			num_closid;
-	int			cache_level;
-	u32			default_ctrl;
 	unsigned int		msr_base;
 	void (*msr_update)	(struct rdt_domain *d, struct msr_param *m,
 				 struct rdt_resource *r);
-	int			data_width;
-	struct list_head	domains;
-	struct rdt_cache	cache;
-	struct rdt_membw	membw;
-	const char		*format_str;
-	int (*parse_ctrlval)(struct rdt_parse_data *data,
-			     struct rdt_resource *r,
-			     struct rdt_domain *d);
-	struct list_head	evt_list;
-	int			num_rmid;
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
-	unsigned long		fflags;
 };
 
+static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r)
+{
+	return container_of(r, struct rdt_hw_resource, r_resctrl);
+}
+
 int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	      struct rdt_domain *d);
 int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
@@ -505,7 +420,7 @@ int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
 
 extern struct mutex rdtgroup_mutex;
 
-extern struct rdt_resource rdt_resources_all[];
+extern struct rdt_hw_resource rdt_resources_all[];
 extern struct rdtgroup rdtgroup_default;
 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 
@@ -524,33 +439,42 @@ enum {
 	RDT_NUM_RESOURCES,
 };
 
+static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
+{
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res);
+
+	hw_res++;
+	return &hw_res->r_resctrl;
+}
+
+/*
+ * To return the common struct rdt_resource, which is contained in struct
+ * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
+ * This makes the limit the resctrl member past the end of the array.
+ */
 #define for_each_rdt_resource(r)					      \
-	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
-	     r++)
+	for (r = &rdt_resources_all[0].r_resctrl;			      \
+	     r < &rdt_resources_all[RDT_NUM_RESOURCES].r_resctrl;	      \
+	     r = resctrl_inc(r))
 
 #define for_each_capable_rdt_resource(r)				      \
-	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
-	     r++)							      \
+	for_each_rdt_resource(r)					      \
 		if (r->alloc_capable || r->mon_capable)
 
 #define for_each_alloc_capable_rdt_resource(r)				      \
-	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
-	     r++)							      \
+	for_each_rdt_resource(r)					      \
 		if (r->alloc_capable)
 
 #define for_each_mon_capable_rdt_resource(r)				      \
-	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
-	     r++)							      \
+	for_each_rdt_resource(r)					      \
 		if (r->mon_capable)
 
 #define for_each_alloc_enabled_rdt_resource(r)				      \
-	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
-	     r++)							      \
+	for_each_rdt_resource(r)					      \
 		if (r->alloc_enabled)
 
 #define for_each_mon_enabled_rdt_resource(r)				      \
-	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
-	     r++)							      \
+	for_each_rdt_resource(r)					      \
 		if (r->mon_enabled)
 
 /* CPUID.(EAX=10H, ECX=ResID=1).EAX */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index f07c10b87a87..5daf5847ff4c 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -174,7 +174,7 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
 	struct rdt_resource *r;
 	u32 crmid = 1, nrmid;
 
-	r = &rdt_resources_all[RDT_RESOURCE_L3];
+	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 
 	/*
 	 * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
@@ -232,7 +232,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
 	int cpu;
 	u64 val;
 
-	r = &rdt_resources_all[RDT_RESOURCE_L3];
+	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 
 	entry->busy = 0;
 	cpu = get_cpu();
@@ -287,6 +287,7 @@ static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
 
 static int __mon_event_count(u32 rmid, struct rmid_read *rr)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(rr->r);
 	struct mbm_state *m;
 	u64 chunks, tval;
 
@@ -319,7 +320,7 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
 		return 0;
 	}
 
-	chunks = mbm_overflow_count(m->prev_msr, tval, rr->r->mbm_width);
+	chunks = mbm_overflow_count(m->prev_msr, tval, hw_res->mbm_width);
 	m->chunks += chunks;
 	m->prev_msr = tval;
 
@@ -334,7 +335,7 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr)
  */
 static void mbm_bw_count(u32 rmid, struct rmid_read *rr)
 {
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3];
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(rr->r);
 	struct mbm_state *m = &rr->d->mbm_local[rmid];
 	u64 tval, cur_bw, chunks;
 
@@ -342,8 +343,8 @@ static void mbm_bw_count(u32 rmid, struct rmid_read *rr)
 	if (tval & (RMID_VAL_ERROR | RMID_VAL_UNAVAIL))
 		return;
 
-	chunks = mbm_overflow_count(m->prev_bw_msr, tval, rr->r->mbm_width);
-	cur_bw = (get_corrected_mbm_count(rmid, chunks) * r->mon_scale) >> 20;
+	chunks = mbm_overflow_count(m->prev_bw_msr, tval, hw_res->mbm_width);
+	cur_bw = (get_corrected_mbm_count(rmid, chunks) * hw_res->mon_scale) >> 20;
 
 	if (m->delta_comp)
 		m->delta_bw = abs(cur_bw - m->prev_bw);
@@ -416,6 +417,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 {
 	u32 closid, rmid, cur_msr, cur_msr_val, new_msr_val;
 	struct mbm_state *pmbm_data, *cmbm_data;
+	struct rdt_hw_resource *hw_r_mba;
 	u32 cur_bw, delta_bw, user_bw;
 	struct rdt_resource *r_mba;
 	struct rdt_domain *dom_mba;
@@ -425,7 +427,8 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	if (!is_mbm_local_enabled())
 		return;
 
-	r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
+	hw_r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
+	r_mba = &hw_r_mba->r_resctrl;
 	closid = rgrp->closid;
 	rmid = rgrp->mon.rmid;
 	pmbm_data = &dom_mbm->mbm_local[rmid];
@@ -474,7 +477,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 		return;
 	}
 
-	cur_msr = r_mba->msr_base + closid;
+	cur_msr = hw_r_mba->msr_base + closid;
 	wrmsrl(cur_msr, delay_bw_map(new_msr_val, r_mba));
 	dom_mba->ctrl_val[closid] = new_msr_val;
 
@@ -538,7 +541,7 @@ void cqm_handle_limbo(struct work_struct *work)
 
 	mutex_lock(&rdtgroup_mutex);
 
-	r = &rdt_resources_all[RDT_RESOURCE_L3];
+	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	d = container_of(work, struct rdt_domain, cqm_limbo.work);
 
 	__check_limbo(d, false);
@@ -574,7 +577,7 @@ void mbm_handle_overflow(struct work_struct *work)
 	if (!static_branch_likely(&rdt_mon_enable_key))
 		goto out_unlock;
 
-	r = &rdt_resources_all[RDT_RESOURCE_L3];
+	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	d = container_of(work, struct rdt_domain, mbm_over.work);
 
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
@@ -671,15 +674,16 @@ static void l3_mon_evt_init(struct rdt_resource *r)
 int rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	unsigned int cl_size = boot_cpu_data.x86_cache_size;
 	int ret;
 
-	r->mon_scale = boot_cpu_data.x86_cache_occ_scale;
+	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale;
 	r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;
-	r->mbm_width = MBM_CNTR_WIDTH_BASE;
+	hw_res->mbm_width = MBM_CNTR_WIDTH_BASE;
 
 	if (mbm_offset > 0 && mbm_offset <= MBM_CNTR_WIDTH_OFFSET_MAX)
-		r->mbm_width += mbm_offset;
+		hw_res->mbm_width += mbm_offset;
 	else if (mbm_offset > MBM_CNTR_WIDTH_OFFSET_MAX)
 		pr_warn("Ignoring impossible MBM counter offset\n");
 
@@ -693,7 +697,7 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
 	resctrl_cqm_threshold = cl_size * 1024 / r->num_rmid;
 
 	/* h/w works in units of "boot_cpu_data.x86_cache_occ_scale" */
-	resctrl_cqm_threshold /= r->mon_scale;
+	resctrl_cqm_threshold /= hw_res->mon_scale;
 
 	ret = dom_data_init(r);
 	if (ret)
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 2207916cae65..17868acd9b9c 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -688,8 +688,8 @@ int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
 	 *   resource, the portion of cache used by it should be made
 	 *   unavailable to all future allocations from both resources.
 	 */
-	if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled ||
-	    rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled) {
+	if (rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl.alloc_enabled ||
+	    rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl.alloc_enabled) {
 		rdt_last_cmd_puts("CDP enabled\n");
 		return -EINVAL;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 01fd30e7829d..d49a00754d98 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -100,12 +100,15 @@ int closids_supported(void)
 
 static void closid_init(void)
 {
+	struct rdt_hw_resource *hw_res;
 	struct rdt_resource *r;
 	int rdt_min_closid = 32;
 
 	/* Compute rdt_min_closid across all resources */
-	for_each_alloc_enabled_rdt_resource(r)
-		rdt_min_closid = min(rdt_min_closid, r->num_closid);
+	for_each_alloc_enabled_rdt_resource(r) {
+		hw_res = resctrl_to_arch_res(r);
+		rdt_min_closid = min(rdt_min_closid, hw_res->num_closid);
+	}
 
 	closid_free_map = BIT_MASK(rdt_min_closid) - 1;
 
@@ -843,8 +846,10 @@ static int rdt_num_closids_show(struct kernfs_open_file *of,
 				struct seq_file *seq, void *v)
 {
 	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_hw_resource *hw_res;
 
-	seq_printf(seq, "%d\n", r->num_closid);
+	hw_res = resctrl_to_arch_res(r);
+	seq_printf(seq, "%d\n", hw_res->num_closid);
 	return 0;
 }
 
@@ -1020,8 +1025,9 @@ static int max_threshold_occ_show(struct kernfs_open_file *of,
 				  struct seq_file *seq, void *v)
 {
 	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
-	seq_printf(seq, "%u\n", resctrl_cqm_threshold * r->mon_scale);
+	seq_printf(seq, "%u\n", resctrl_cqm_threshold * hw_res->mon_scale);
 
 	return 0;
 }
@@ -1042,7 +1048,7 @@ static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
 static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
 				       char *buf, size_t nbytes, loff_t off)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_hw_resource *hw_res;
 	unsigned int bytes;
 	int ret;
 
@@ -1053,7 +1059,8 @@ static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
 	if (bytes > (boot_cpu_data.x86_cache_size * 1024))
 		return -EINVAL;
 
-	resctrl_cqm_threshold = bytes / r->mon_scale;
+	hw_res = resctrl_to_arch_res(of->kn->parent->priv);
+	resctrl_cqm_threshold = bytes / hw_res->mon_scale;
 
 	return nbytes;
 }
@@ -1111,16 +1118,16 @@ static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
 
 	switch (r->rid) {
 	case RDT_RESOURCE_L3DATA:
-		_r_cdp = &rdt_resources_all[RDT_RESOURCE_L3CODE];
+		_r_cdp = &rdt_resources_all[RDT_RESOURCE_L3CODE].r_resctrl;
 		break;
 	case RDT_RESOURCE_L3CODE:
-		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L3DATA];
+		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl;
 		break;
 	case RDT_RESOURCE_L2DATA:
-		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2CODE];
+		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2CODE].r_resctrl;
 		break;
 	case RDT_RESOURCE_L2CODE:
-		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2DATA];
+		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl;
 		break;
 	default:
 		ret = -ENOENT;
@@ -1867,7 +1874,7 @@ static void l2_qos_cfg_update(void *arg)
 
 static inline bool is_mba_linear(void)
 {
-	return rdt_resources_all[RDT_RESOURCE_MBA].membw.delay_linear;
+	return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.delay_linear;
 }
 
 static int set_cache_qos_cfg(int level, bool enable)
@@ -1888,7 +1895,7 @@ static int set_cache_qos_cfg(int level, bool enable)
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
 		return -ENOMEM;
 
-	r_l = &rdt_resources_all[level];
+	r_l = &rdt_resources_all[level].r_resctrl;
 	list_for_each_entry(d, &r_l->domains, list) {
 		if (r_l->cache.arch_has_per_cpu_cfg)
 			/* Pick all the CPUs in the domain instance */
@@ -1917,10 +1924,10 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 	if (!r->alloc_capable)
 		return;
 
-	if (r == &rdt_resources_all[RDT_RESOURCE_L2DATA])
+	if (r == &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl)
 		l2_qos_cfg_update(&r->alloc_enabled);
 
-	if (r == &rdt_resources_all[RDT_RESOURCE_L3DATA])
+	if (r == &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl)
 		l3_qos_cfg_update(&r->alloc_enabled);
 }
 
@@ -1932,7 +1939,7 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
  */
 static int set_mba_sc(bool mba_sc)
 {
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA];
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 	struct rdt_domain *d;
 
 	if (!is_mbm_enabled() || !is_mba_linear() ||
@@ -1948,9 +1955,9 @@ static int set_mba_sc(bool mba_sc)
 
 static int cdp_enable(int level, int data_type, int code_type)
 {
-	struct rdt_resource *r_ldata = &rdt_resources_all[data_type];
-	struct rdt_resource *r_lcode = &rdt_resources_all[code_type];
-	struct rdt_resource *r_l = &rdt_resources_all[level];
+	struct rdt_resource *r_ldata = &rdt_resources_all[data_type].r_resctrl;
+	struct rdt_resource *r_lcode = &rdt_resources_all[code_type].r_resctrl;
+	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
 	int ret;
 
 	if (!r_l->alloc_capable || !r_ldata->alloc_capable ||
@@ -1980,13 +1987,13 @@ static int cdpl2_enable(void)
 
 static void cdp_disable(int level, int data_type, int code_type)
 {
-	struct rdt_resource *r = &rdt_resources_all[level];
+	struct rdt_resource *r = &rdt_resources_all[level].r_resctrl;
 
 	r->alloc_enabled = r->alloc_capable;
 
-	if (rdt_resources_all[data_type].alloc_enabled) {
-		rdt_resources_all[data_type].alloc_enabled = false;
-		rdt_resources_all[code_type].alloc_enabled = false;
+	if (rdt_resources_all[data_type].r_resctrl.alloc_enabled) {
+		rdt_resources_all[data_type].r_resctrl.alloc_enabled = false;
+		rdt_resources_all[code_type].r_resctrl.alloc_enabled = false;
 		set_cache_qos_cfg(level, false);
 	}
 }
@@ -2003,9 +2010,9 @@ static void cdpl2_disable(void)
 
 static void cdp_disable_all(void)
 {
-	if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled)
+	if (rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl.alloc_enabled)
 		cdpl3_disable();
-	if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled)
+	if (rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl.alloc_enabled)
 		cdpl2_disable();
 }
 
@@ -2153,7 +2160,7 @@ static int rdt_get_tree(struct fs_context *fc)
 		static_branch_enable_cpuslocked(&rdt_enable_key);
 
 	if (is_mbm_enabled()) {
-		r = &rdt_resources_all[RDT_RESOURCE_L3];
+		r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 		list_for_each_entry(dom, &r->domains, list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL);
 	}
@@ -2257,6 +2264,7 @@ static int rdt_init_fs_context(struct fs_context *fc)
 
 static int reset_all_ctrls(struct rdt_resource *r)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	struct msr_param msr_param;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
@@ -2267,7 +2275,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
 
 	msr_param.res = r;
 	msr_param.low = 0;
-	msr_param.high = r->num_closid;
+	msr_param.high = hw_res->num_closid;
 
 	/*
 	 * Disable resource control for this resource by setting all
@@ -2277,7 +2285,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	list_for_each_entry(d, &r->domains, list) {
 		cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
 
-		for (i = 0; i < r->num_closid; i++)
+		for (i = 0; i < hw_res->num_closid; i++)
 			d->ctrl_val[i] = r->default_ctrl;
 	}
 	cpu = get_cpu();
@@ -3124,13 +3132,13 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)
 
 static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
 {
-	if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled)
+	if (rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl.alloc_enabled)
 		seq_puts(seq, ",cdp");
 
-	if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled)
+	if (rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl.alloc_enabled)
 		seq_puts(seq, ",cdpl2");
 
-	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA]))
+	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
 		seq_puts(seq, ",mba_MBps");
 
 	return 0;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 9b05af9b3e28..5ccf36b7dbbf 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -2,6 +2,8 @@
 #ifndef _RESCTRL_H
 #define _RESCTRL_H
 
+#include <linux/kernel.h>
+#include <linux/list.h>
 #include <linux/pid.h>
 
 #ifdef CONFIG_PROC_CPU_RESCTRL
@@ -13,4 +15,112 @@ int proc_resctrl_show(struct seq_file *m,
 
 #endif
 
+struct rdt_domain;
+
+/**
+ * struct resctrl_cache - Cache allocation related data
+ * @cbm_len:		Length of the cache bit mask
+ * @min_cbm_bits:	Minimum number of consecutive bits to be set
+ * @cbm_idx_mult:	Multiplier of CBM index
+ * @cbm_idx_offset:	Offset of CBM index. CBM index is computed by:
+ *			closid * cbm_idx_multi + cbm_idx_offset
+ *			in a cache bit mask
+ * @shareable_bits:	Bitmask of shareable resource with other
+ *			executing entities
+ * @arch_has_sparse_bitmaps:	True if a bitmap like f00f is valid.
+ * @arch_has_empty_bitmaps:	True if the '0' bitmap is valid.
+ * @arch_has_per_cpu_cfg:	True if QOS_CFG register for this cache
+ *				level has CPU scope.
+ */
+struct resctrl_cache {
+	unsigned int	cbm_len;
+	unsigned int	min_cbm_bits;
+	unsigned int	cbm_idx_mult;	// TODO remove this
+	unsigned int	cbm_idx_offset; // TODO remove this
+	unsigned int	shareable_bits;
+	bool		arch_has_sparse_bitmaps;
+	bool		arch_has_empty_bitmaps;
+	bool		arch_has_per_cpu_cfg;
+};
+
+/**
+ * enum membw_throttle_mode - System's memory bandwidth throttling mode
+ * @THREAD_THROTTLE_UNDEFINED:	Not relevant to the system
+ * @THREAD_THROTTLE_MAX:	Memory bandwidth is throttled at the core
+ *				always using smallest bandwidth percentage
+ *				assigned to threads, aka "max throttling"
+ * @THREAD_THROTTLE_PER_THREAD:	Memory bandwidth is throttled at the thread
+ */
+enum membw_throttle_mode {
+	THREAD_THROTTLE_UNDEFINED = 0,
+	THREAD_THROTTLE_MAX,
+	THREAD_THROTTLE_PER_THREAD,
+};
+
+/**
+ * struct resctrl_membw - Memory bandwidth allocation related data
+ * @min_bw:		Minimum memory bandwidth percentage user can request
+ * @bw_gran:		Granularity at which the memory bandwidth is allocated
+ * @delay_linear:	True if memory B/W delay is in linear scale
+ * @arch_needs_linear:	True if we can't configure non-linear resources
+ * @throttle_mode:	Bandwidth throttling mode when threads request
+ *			different memory bandwidths
+ * @mba_sc:		True if MBA software controller(mba_sc) is enabled
+ * @mb_map:		Mapping of memory B/W percentage to memory B/W delay
+ */
+struct resctrl_membw {
+	u32				min_bw;
+	u32				bw_gran;
+	u32				delay_linear;
+	bool				arch_needs_linear;
+	enum membw_throttle_mode	throttle_mode;
+	bool				mba_sc;
+	u32				*mb_map;
+};
+
+struct rdt_parse_data;
+
+/**
+ * struct rdt_resource - attributes of a resctrl resource
+ * @rid:		The index of the resource
+ * @alloc_enabled:	Is allocation enabled on this machine
+ * @mon_enabled:	Is monitoring enabled for this feature
+ * @alloc_capable:	Is allocation available on this machine
+ * @mon_capable:	Is monitor feature available on this machine
+ * @num_rmid:		Number of RMIDs available
+ * @cache_level:	Which cache level defines scope of this resource
+ * @cache:		Cache allocation related data
+ * @membw:		If the component has bandwidth controls, their properties.
+ * @domains:		All domains for this resource
+ * @name:		Name to use in "schemata" file.
+ * @data_width:		Character width of data when displaying
+ * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
+ * @format_str:		Per resource format string to show domain value
+ * @parse_ctrlval:	Per resource function pointer to parse control values
+ * @evt_list:		List of monitoring events
+ * @fflags:		flags to choose base and info files
+ */
+struct rdt_resource {
+	int			rid;
+	bool			alloc_enabled;
+	bool			mon_enabled;
+	bool			alloc_capable;
+	bool			mon_capable;
+	int			num_rmid;
+	int			cache_level;
+	struct resctrl_cache	cache;
+	struct resctrl_membw	membw;
+	struct list_head	domains;
+	char			*name;
+	int			data_width;
+	u32			default_ctrl;
+	const char		*format_str;
+	int			(*parse_ctrlval)(struct rdt_parse_data *data,
+						 struct rdt_resource *r,
+						 struct rdt_domain *d);
+	struct list_head	evt_list;
+	unsigned long		fflags;
+
+};
+
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 02/24] x86/resctrl: Split struct rdt_domain
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
  2021-07-15 17:30 ` [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 03/24] x86/resctrl: Add a separate schema list for resctrl James Morse
                   ` (21 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

resctrl is the defacto Linux ABI for SoC resource partitioning features.

To support it on another architecture, it needs to be abstracted from
the features provided by Intel RDT and AMD PQoS, and moved to /fs/.
struct rdt_domain contains a mix of architecture private details
and properties of the filesystem interface user-space uses.

Continue by splitting struct rdt_domain, into an architecture private
'hw' struct, which contains the common resctrl structure that would be
used by any architecture. The hardware values in ctrl_val and mbps_val
need to be accessed via helpers to allow another architecture to convert
these into a different format if necessary. After this split, filesystem
code paths touching a 'hw' struct indicates where an abstraction
is needed.

Splitting this structure only moves types around, and should not lead
to any change in behaviour.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Renamed struct member 'd_resctrl'.

Changes since v3:
 * Removed a double word, removed a space.

Changes since v2:
 * Shuffled commit message,
 * Changed kerneldoc text above rdt_hw_domain

Changes since v1:
 * Tabs space and other whitespace
 * cpu becomes CPU in all comments touched
---
 arch/x86/kernel/cpu/resctrl/core.c        | 32 ++++++++++-------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 10 ++++--
 arch/x86/kernel/cpu/resctrl/internal.h    | 43 +++++++----------------
 arch/x86/kernel/cpu/resctrl/monitor.c     |  8 +++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 29 +++++++++------
 include/linux/resctrl.h                   | 32 ++++++++++++++++-
 6 files changed, 94 insertions(+), 60 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 942d070aa92c..10fbbc3cf40a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -385,10 +385,11 @@ static void
 mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 {
 	unsigned int i;
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(hw_res->msr_base + i, d->ctrl_val[i]);
+		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
 }
 
 /*
@@ -410,21 +411,23 @@ mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
 		struct rdt_resource *r)
 {
 	unsigned int i;
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	/*  Write the delay values for mba. */
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(hw_res->msr_base + i, delay_bw_map(d->ctrl_val[i], r));
+		wrmsrl(hw_res->msr_base + i, delay_bw_map(hw_dom->ctrl_val[i], r));
 }
 
 static void
 cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 {
 	unsigned int i;
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(hw_res->msr_base + cbm_idx(r, i), d->ctrl_val[i]);
+		wrmsrl(hw_res->msr_base + cbm_idx(r, i), hw_dom->ctrl_val[i]);
 }
 
 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
@@ -510,21 +513,22 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
 static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct msr_param m;
 	u32 *dc, *dm;
 
-	dc = kmalloc_array(hw_res->num_closid, sizeof(*d->ctrl_val), GFP_KERNEL);
+	dc = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->ctrl_val), GFP_KERNEL);
 	if (!dc)
 		return -ENOMEM;
 
-	dm = kmalloc_array(hw_res->num_closid, sizeof(*d->mbps_val), GFP_KERNEL);
+	dm = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->mbps_val), GFP_KERNEL);
 	if (!dm) {
 		kfree(dc);
 		return -ENOMEM;
 	}
 
-	d->ctrl_val = dc;
-	d->mbps_val = dm;
+	hw_dom->ctrl_val = dc;
+	hw_dom->mbps_val = dm;
 	setup_default_ctrlval(r, dc, dm);
 
 	m.low = 0;
@@ -586,6 +590,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 {
 	int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
 	struct list_head *add_pos = NULL;
+	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
 
 	d = rdt_find_domain(r, id, &add_pos);
@@ -601,10 +606,11 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	d = kzalloc_node(sizeof(*d), GFP_KERNEL, cpu_to_node(cpu));
-	if (!d)
+	hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu));
+	if (!hw_dom)
 		return;
 
+	d = &hw_dom->d_resctrl;
 	d->id = id;
 	cpumask_set_cpu(cpu, &d->cpu_mask);
 
@@ -633,6 +639,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 {
 	int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
+	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
 
 	d = rdt_find_domain(r, id, NULL);
@@ -640,6 +647,7 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 		pr_warn("Couldn't find cache id for CPU %d\n", cpu);
 		return;
 	}
+	hw_dom = resctrl_to_arch_dom(d);
 
 	cpumask_clear_cpu(cpu, &d->cpu_mask);
 	if (cpumask_empty(&d->cpu_mask)) {
@@ -672,12 +680,12 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 		if (d->plr)
 			d->plr->d = NULL;
 
-		kfree(d->ctrl_val);
-		kfree(d->mbps_val);
+		kfree(hw_dom->ctrl_val);
+		kfree(hw_dom->mbps_val);
 		bitmap_free(d->rmid_busy_llc);
 		kfree(d->mbm_total);
 		kfree(d->mbm_local);
-		kfree(d);
+		kfree(hw_dom);
 		return;
 	}
 
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 3f0c33d5b658..08eef539cb6c 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -238,6 +238,7 @@ static int parse_line(char *line, struct rdt_resource *r,
 
 int update_domains(struct rdt_resource *r, int closid)
 {
+	struct rdt_hw_domain *hw_dom;
 	struct msr_param msr_param;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
@@ -254,7 +255,8 @@ int update_domains(struct rdt_resource *r, int closid)
 
 	mba_sc = is_mba_sc(r);
 	list_for_each_entry(d, &r->domains, list) {
-		dc = !mba_sc ? d->ctrl_val : d->mbps_val;
+		hw_dom = resctrl_to_arch_dom(d);
+		dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
 		if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
 			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
 			dc[closid] = d->new_ctrl;
@@ -375,17 +377,19 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 
 static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
 {
+	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *dom;
 	bool sep = false;
 	u32 ctrl_val;
 
 	seq_printf(s, "%*s:", max_name_width, r->name);
 	list_for_each_entry(dom, &r->domains, list) {
+		hw_dom = resctrl_to_arch_dom(dom);
 		if (sep)
 			seq_puts(s, ";");
 
-		ctrl_val = (!is_mba_sc(r) ? dom->ctrl_val[closid] :
-			    dom->mbps_val[closid]);
+		ctrl_val = (!is_mba_sc(r) ? hw_dom->ctrl_val[closid] :
+			    hw_dom->mbps_val[closid]);
 		seq_printf(s, r->format_str, dom->id, max_data_width,
 			   ctrl_val);
 		sep = true;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 88d71c889328..6276beed64a8 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -304,44 +304,25 @@ struct mbm_state {
 };
 
 /**
- * struct rdt_domain - group of cpus sharing an RDT resource
- * @list:	all instances of this resource
- * @id:		unique id for this instance
- * @cpu_mask:	which cpus share this resource
- * @rmid_busy_llc:
- *		bitmap of which limbo RMIDs are above threshold
- * @mbm_total:	saved state for MBM total bandwidth
- * @mbm_local:	saved state for MBM local bandwidth
- * @mbm_over:	worker to periodically read MBM h/w counters
- * @cqm_limbo:	worker to periodically read CQM h/w counters
- * @mbm_work_cpu:
- *		worker cpu for MBM h/w counters
- * @cqm_work_cpu:
- *		worker cpu for CQM h/w counters
+ * struct rdt_hw_domain - Arch private attributes of a set of CPUs that share
+ *			  a resource
+ * @d_resctrl:	Properties exposed to the resctrl file system
  * @ctrl_val:	array of cache or mem ctrl values (indexed by CLOSID)
  * @mbps_val:	When mba_sc is enabled, this holds the bandwidth in MBps
- * @new_ctrl:	new ctrl value to be loaded
- * @have_new_ctrl: did user provide new_ctrl for this domain
- * @plr:	pseudo-locked region (if any) associated with domain
+ *
+ * Members of this structure are accessed via helpers that provide abstraction.
  */
-struct rdt_domain {
-	struct list_head		list;
-	int				id;
-	struct cpumask			cpu_mask;
-	unsigned long			*rmid_busy_llc;
-	struct mbm_state		*mbm_total;
-	struct mbm_state		*mbm_local;
-	struct delayed_work		mbm_over;
-	struct delayed_work		cqm_limbo;
-	int				mbm_work_cpu;
-	int				cqm_work_cpu;
+struct rdt_hw_domain {
+	struct rdt_domain		d_resctrl;
 	u32				*ctrl_val;
 	u32				*mbps_val;
-	u32				new_ctrl;
-	bool				have_new_ctrl;
-	struct pseudo_lock_region	*plr;
 };
 
+static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
+{
+	return container_of(r, struct rdt_hw_domain, d_resctrl);
+}
+
 /**
  * struct msr_param - set a range of MSRs from a domain
  * @res:       The resource to use
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 5daf5847ff4c..26a094870c16 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -418,6 +418,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	u32 closid, rmid, cur_msr, cur_msr_val, new_msr_val;
 	struct mbm_state *pmbm_data, *cmbm_data;
 	struct rdt_hw_resource *hw_r_mba;
+	struct rdt_hw_domain *hw_dom_mba;
 	u32 cur_bw, delta_bw, user_bw;
 	struct rdt_resource *r_mba;
 	struct rdt_domain *dom_mba;
@@ -438,11 +439,12 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 		pr_warn_once("Failure to get domain for MBA update\n");
 		return;
 	}
+	hw_dom_mba = resctrl_to_arch_dom(dom_mba);
 
 	cur_bw = pmbm_data->prev_bw;
-	user_bw = dom_mba->mbps_val[closid];
+	user_bw = hw_dom_mba->mbps_val[closid];
 	delta_bw = pmbm_data->delta_bw;
-	cur_msr_val = dom_mba->ctrl_val[closid];
+	cur_msr_val = hw_dom_mba->ctrl_val[closid];
 
 	/*
 	 * For Ctrl groups read data from child monitor groups.
@@ -479,7 +481,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 
 	cur_msr = hw_r_mba->msr_base + closid;
 	wrmsrl(cur_msr, delay_bw_map(new_msr_val, r_mba));
-	dom_mba->ctrl_val[closid] = new_msr_val;
+	hw_dom_mba->ctrl_val[closid] = new_msr_val;
 
 	/*
 	 * Delta values are updated dynamically package wise for each
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d49a00754d98..d190a21845ce 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -915,7 +915,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 	list_for_each_entry(dom, &r->domains, list) {
 		if (sep)
 			seq_putc(seq, ';');
-		ctrl = dom->ctrl_val;
+		ctrl = resctrl_to_arch_dom(dom)->ctrl_val;
 		sw_shareable = 0;
 		exclusive = 0;
 		seq_printf(seq, "%d=", dom->id);
@@ -1193,7 +1193,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 	}
 
 	/* Check for overlap with other resource groups */
-	ctrl = d->ctrl_val;
+	ctrl = resctrl_to_arch_dom(d)->ctrl_val;
 	for (i = 0; i < closids_supported(); i++, ctrl++) {
 		ctrl_b = *ctrl;
 		mode = rdtgroup_mode_by_closid(i);
@@ -1262,6 +1262,7 @@ bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
  */
 static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 {
+	struct rdt_hw_domain *hw_dom;
 	int closid = rdtgrp->closid;
 	struct rdt_resource *r;
 	bool has_cache = false;
@@ -1272,7 +1273,8 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 			continue;
 		has_cache = true;
 		list_for_each_entry(d, &r->domains, list) {
-			if (rdtgroup_cbm_overlaps(r, d, d->ctrl_val[closid],
+			hw_dom = resctrl_to_arch_dom(d);
+			if (rdtgroup_cbm_overlaps(r, d, hw_dom->ctrl_val[closid],
 						  rdtgrp->closid, false)) {
 				rdt_last_cmd_puts("Schemata overlaps\n");
 				return false;
@@ -1404,6 +1406,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 static int rdtgroup_size_show(struct kernfs_open_file *of,
 			      struct seq_file *s, void *v)
 {
+	struct rdt_hw_domain *hw_dom;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
 	struct rdt_domain *d;
@@ -1438,14 +1441,15 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 		sep = false;
 		seq_printf(s, "%*s:", max_name_width, r->name);
 		list_for_each_entry(d, &r->domains, list) {
+			hw_dom = resctrl_to_arch_dom(d);
 			if (sep)
 				seq_putc(s, ';');
 			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 				size = 0;
 			} else {
 				ctrl = (!is_mba_sc(r) ?
-						d->ctrl_val[rdtgrp->closid] :
-						d->mbps_val[rdtgrp->closid]);
+						hw_dom->ctrl_val[rdtgrp->closid] :
+						hw_dom->mbps_val[rdtgrp->closid]);
 				if (r->rid == RDT_RESOURCE_MBA)
 					size = ctrl;
 				else
@@ -1940,6 +1944,7 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 static int set_mba_sc(bool mba_sc)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
+	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
 
 	if (!is_mbm_enabled() || !is_mba_linear() ||
@@ -1947,8 +1952,10 @@ static int set_mba_sc(bool mba_sc)
 		return -EINVAL;
 
 	r->membw.mba_sc = mba_sc;
-	list_for_each_entry(d, &r->domains, list)
-		setup_default_ctrlval(r, d->ctrl_val, d->mbps_val);
+	list_for_each_entry(d, &r->domains, list) {
+		hw_dom = resctrl_to_arch_dom(d);
+		setup_default_ctrlval(r, hw_dom->ctrl_val, hw_dom->mbps_val);
+	}
 
 	return 0;
 }
@@ -2265,6 +2272,7 @@ static int rdt_init_fs_context(struct fs_context *fc)
 static int reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	struct rdt_hw_domain *hw_dom;
 	struct msr_param msr_param;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
@@ -2283,10 +2291,11 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	 * from each domain to update the MSRs below.
 	 */
 	list_for_each_entry(d, &r->domains, list) {
+		hw_dom = resctrl_to_arch_dom(d);
 		cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
 
 		for (i = 0; i < hw_res->num_closid; i++)
-			d->ctrl_val[i] = r->default_ctrl;
+			hw_dom->ctrl_val[i] = r->default_ctrl;
 	}
 	cpu = get_cpu();
 	/* Update CBM on this cpu if it's in cpu_mask. */
@@ -2665,7 +2674,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
 	d->have_new_ctrl = false;
 	d->new_ctrl = r->cache.shareable_bits;
 	used_b = r->cache.shareable_bits;
-	ctrl = d->ctrl_val;
+	ctrl = resctrl_to_arch_dom(d)->ctrl_val;
 	for (i = 0; i < closids_supported(); i++, ctrl++) {
 		if (closid_allocated(i) && i != closid) {
 			mode = rdtgroup_mode_by_closid(i);
@@ -2682,7 +2691,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
 			 * with an exclusive group.
 			 */
 			if (d_cdp)
-				peer_ctl = d_cdp->ctrl_val[i];
+				peer_ctl = resctrl_to_arch_dom(d_cdp)->ctrl_val[i];
 			else
 				peer_ctl = 0;
 			used_b |= *ctrl | peer_ctl;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5ccf36b7dbbf..a4c89dafd7fa 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -15,7 +15,37 @@ int proc_resctrl_show(struct seq_file *m,
 
 #endif
 
-struct rdt_domain;
+/**
+ * struct rdt_domain - group of CPUs sharing a resctrl resource
+ * @list:		all instances of this resource
+ * @id:			unique id for this instance
+ * @cpu_mask:		which CPUs share this resource
+ * @new_ctrl:		new ctrl value to be loaded
+ * @have_new_ctrl:	did user provide new_ctrl for this domain
+ * @rmid_busy_llc:	bitmap of which limbo RMIDs are above threshold
+ * @mbm_total:		saved state for MBM total bandwidth
+ * @mbm_local:		saved state for MBM local bandwidth
+ * @mbm_over:		worker to periodically read MBM h/w counters
+ * @cqm_limbo:		worker to periodically read CQM h/w counters
+ * @mbm_work_cpu:	worker CPU for MBM h/w counters
+ * @cqm_work_cpu:	worker CPU for CQM h/w counters
+ * @plr:		pseudo-locked region (if any) associated with domain
+ */
+struct rdt_domain {
+	struct list_head		list;
+	int				id;
+	struct cpumask			cpu_mask;
+	u32				new_ctrl;
+	bool				have_new_ctrl;
+	unsigned long			*rmid_busy_llc;
+	struct mbm_state		*mbm_total;
+	struct mbm_state		*mbm_local;
+	struct delayed_work		mbm_over;
+	struct delayed_work		cqm_limbo;
+	int				mbm_work_cpu;
+	int				cqm_work_cpu;
+	struct pseudo_lock_region	*plr;
+};
 
 /**
  * struct resctrl_cache - Cache allocation related data
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 03/24] x86/resctrl: Add a separate schema list for resctrl
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
  2021-07-15 17:30 ` [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource James Morse
  2021-07-15 17:30 ` [PATCH v6 02/24] x86/resctrl: Split struct rdt_domain James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 04/24] x86/resctrl: Pass the schema in info dir's private pointer James Morse
                   ` (20 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Resctrl exposes schemata to user-space, which allow the control values
to be specified for a group of tasks.

User-visible properties of the interface, (such as the schemata names
and how the values are parsed) are rooted in a struct provided by the
architecture code. (struct rdt_hw_resource). Once a second architecture
uses resctrl, this would allow user-visible properties to diverge
between architectures.

These properties should come from the resctrl code that will be common
to all architectures. Resctrl has no per-schema structure, only struct
rdt_{hw_,}resource. Create a struct resctrl_schema to hold the
rdt_resource. Before a second architecture can be supported, this
structure will also need to hold the schema name visible to user-space
and the type of configuration values for resctrl.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Fixed a spelling mistake, removed a space.

Changes since v2:
 * Expanded comments.
 * Shuffled commit message,

Changes since v1:
 * Renamed resctrl_all_schema list
 * Used schemata_list as a prefix to make these easier to search for
 * Added kerneldoc string
 * Removed 'pending configuration' reference in commit message
---
 arch/x86/kernel/cpu/resctrl/internal.h |  1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 43 +++++++++++++++++++++++++-
 include/linux/resctrl.h                | 11 +++++++
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 6276beed64a8..94f4c683b7c3 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -110,6 +110,7 @@ extern unsigned int resctrl_cqm_threshold;
 extern bool rdt_alloc_capable;
 extern bool rdt_mon_capable;
 extern unsigned int rdt_mon_features;
+extern struct list_head resctrl_schema_all;
 
 enum rdt_group_type {
 	RDTCTRL_GROUP = 0,
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d190a21845ce..3e0b6aa94571 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -39,6 +39,9 @@ static struct kernfs_root *rdt_root;
 struct rdtgroup rdtgroup_default;
 LIST_HEAD(rdt_all_groups);
 
+/* list of entries for the schemata file */
+LIST_HEAD(resctrl_schema_all);
+
 /* Kernel fs node for "info" directory under root */
 static struct kernfs_node *kn_info;
 
@@ -2109,6 +2112,35 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx)
 	return ret;
 }
 
+static int schemata_list_create(void)
+{
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+
+	for_each_alloc_enabled_rdt_resource(r) {
+		s = kzalloc(sizeof(*s), GFP_KERNEL);
+		if (!s)
+			return -ENOMEM;
+
+		s->res = r;
+
+		INIT_LIST_HEAD(&s->list);
+		list_add(&s->list, &resctrl_schema_all);
+	}
+
+	return 0;
+}
+
+static void schemata_list_destroy(void)
+{
+	struct resctrl_schema *s, *tmp;
+
+	list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
+		list_del(&s->list);
+		kfree(s);
+	}
+}
+
 static int rdt_get_tree(struct fs_context *fc)
 {
 	struct rdt_fs_context *ctx = rdt_fc2context(fc);
@@ -2130,11 +2162,17 @@ static int rdt_get_tree(struct fs_context *fc)
 	if (ret < 0)
 		goto out_cdp;
 
+	ret = schemata_list_create();
+	if (ret) {
+		schemata_list_destroy();
+		goto out_mba;
+	}
+
 	closid_init();
 
 	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
 	if (ret < 0)
-		goto out_mba;
+		goto out_schemata_free;
 
 	if (rdt_mon_capable) {
 		ret = mongroup_create_dir(rdtgroup_default.kn,
@@ -2184,6 +2222,8 @@ static int rdt_get_tree(struct fs_context *fc)
 		kernfs_remove(kn_mongrp);
 out_info:
 	kernfs_remove(kn_info);
+out_schemata_free:
+	schemata_list_destroy();
 out_mba:
 	if (ctx->enable_mba_mbps)
 		set_mba_sc(false);
@@ -2425,6 +2465,7 @@ static void rdt_kill_sb(struct super_block *sb)
 	rmdir_all_sub();
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
+	schemata_list_destroy();
 	static_branch_disable_cpuslocked(&rdt_alloc_enable_key);
 	static_branch_disable_cpuslocked(&rdt_mon_enable_key);
 	static_branch_disable_cpuslocked(&rdt_enable_key);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index a4c89dafd7fa..5a21d483da6a 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -153,4 +153,15 @@ struct rdt_resource {
 
 };
 
+/**
+ * struct resctrl_schema - configuration abilities of a resource presented to
+ *			   user-space
+ * @list:	Member of resctrl_schema_all.
+ * @res:	The resource structure exported by the architecture to describe
+ *		the hardware that is configured by this schema.
+ */
+struct resctrl_schema {
+	struct list_head		list;
+	struct rdt_resource		*res;
+};
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 04/24] x86/resctrl: Pass the schema in info dir's private pointer
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (2 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 03/24] x86/resctrl: Add a separate schema list for resctrl James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 05/24] x86/resctrl: Label the resources with their configuration type James Morse
                   ` (19 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Many of resctrl's per-schema files return a value from struct
rdt_resource, which they take as their 'priv' pointer.

Moving properties that resctrl exposes to user-space into the core
'fs' code, (e.g. the name of the schema), means some of the functions
that back the filesystem need the schema struct (to where the properties
are moved), but currently take struct rdt_resource. For example, once
the CDP resources are merged, struct rdt_resource no longer reflects all
the properties of the schema.
For the info dirs that represent a control, the information needed
will be accessed via struct resctrl_schema, as this is how the resource
is being used. For the monitors, its still struct rdt_resource as the
monitors aren't described as schema.
This difference means the type of the private pointers varies
between control and monitor info dirs.

Change the 'priv' pointer to point to struct resctrl_schema for
the per-schema files that represent a control. The type can be determined
from the fflags field. If the flags are RF_MON_INFO, its a struct
rdt_resource. If the flags are RF_CTRL_INFO, its a struct resctrl_schema.
No entry in res_common_files[] has both flags.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No Changes since v3

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Added comment above removed for_each_alloc_enabled_rdt_resource() to hint
   at symmetry.
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 38 +++++++++++++++++---------
 1 file changed, 25 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3e0b6aa94571..1fc40dbce85d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -848,7 +848,8 @@ static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
 static int rdt_num_closids_show(struct kernfs_open_file *of,
 				struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 	struct rdt_hw_resource *hw_res;
 
 	hw_res = resctrl_to_arch_res(r);
@@ -859,7 +860,8 @@ static int rdt_num_closids_show(struct kernfs_open_file *of,
 static int rdt_default_ctrl_show(struct kernfs_open_file *of,
 			     struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%x\n", r->default_ctrl);
 	return 0;
@@ -868,7 +870,8 @@ static int rdt_default_ctrl_show(struct kernfs_open_file *of,
 static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
 			     struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
 	return 0;
@@ -877,7 +880,8 @@ static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
 static int rdt_shareable_bits_show(struct kernfs_open_file *of,
 				   struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%x\n", r->cache.shareable_bits);
 	return 0;
@@ -900,13 +904,14 @@ static int rdt_shareable_bits_show(struct kernfs_open_file *of,
 static int rdt_bit_usage_show(struct kernfs_open_file *of,
 			      struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
 	/*
 	 * Use unsigned long even though only 32 bits are used to ensure
 	 * test_bit() is used safely.
 	 */
 	unsigned long sw_shareable = 0, hw_shareable = 0;
 	unsigned long exclusive = 0, pseudo_locked = 0;
+	struct rdt_resource *r = s->res;
 	struct rdt_domain *dom;
 	int i, hwb, swb, excl, psl;
 	enum rdtgrp_mode mode;
@@ -978,7 +983,8 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 static int rdt_min_bw_show(struct kernfs_open_file *of,
 			     struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->membw.min_bw);
 	return 0;
@@ -1009,7 +1015,8 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
 static int rdt_bw_gran_show(struct kernfs_open_file *of,
 			     struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->membw.bw_gran);
 	return 0;
@@ -1018,7 +1025,8 @@ static int rdt_bw_gran_show(struct kernfs_open_file *of,
 static int rdt_delay_linear_show(struct kernfs_open_file *of,
 			     struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->membw.delay_linear);
 	return 0;
@@ -1038,7 +1046,8 @@ static int max_threshold_occ_show(struct kernfs_open_file *of,
 static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
 					 struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
 
 	if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
 		seq_puts(seq, "per-thread\n");
@@ -1771,14 +1780,14 @@ int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
 	return ret;
 }
 
-static int rdtgroup_mkdir_info_resdir(struct rdt_resource *r, char *name,
+static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 				      unsigned long fflags)
 {
 	struct kernfs_node *kn_subdir;
 	int ret;
 
 	kn_subdir = kernfs_create_dir(kn_info, name,
-				      kn_info->mode, r);
+				      kn_info->mode, priv);
 	if (IS_ERR(kn_subdir))
 		return PTR_ERR(kn_subdir);
 
@@ -1795,6 +1804,7 @@ static int rdtgroup_mkdir_info_resdir(struct rdt_resource *r, char *name,
 
 static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 {
+	struct resctrl_schema *s;
 	struct rdt_resource *r;
 	unsigned long fflags;
 	char name[32];
@@ -1809,9 +1819,11 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 	if (ret)
 		goto out_destroy;
 
-	for_each_alloc_enabled_rdt_resource(r) {
+	/* loop over enabled controls, these are all alloc_enabled */
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
 		fflags =  r->fflags | RF_CTRL_INFO;
-		ret = rdtgroup_mkdir_info_resdir(r, r->name, fflags);
+		ret = rdtgroup_mkdir_info_resdir(s, r->name, fflags);
 		if (ret)
 			goto out_destroy;
 	}
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 05/24] x86/resctrl: Label the resources with their configuration type
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (3 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 04/24] x86/resctrl: Pass the schema in info dir's private pointer James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 06/24] x86/resctrl: Walk the resctrl schema list instead of an arch list James Morse
                   ` (18 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

The names of resources are used for the schema name presented to
user-space. The name used is rooted in a structure provided by
the architecture code because the names are different when CDP
is enabled. x86 implements this by swapping between two sets of
resource structures based on their alloc_enabled flag. The type
of configuration in-use is encoded in the name (and cbm_idx_offset).

Once the CDP behaviour is moved into the parts of resctrl that will
move to /fs/, there will be two struct resctrl_schema for one
struct rdt_resource. The schema describes the type of configuration
being applied to the resource. The name of the schema should be
generated by resctrl, base on the type of configuration. To do this
struct resctrl_schema needs to store the type of configuration in use
for a schema.

Create an enum resctrl_conf_type describing the options, and add
it to struct resctrl_schema. The underlying resources are still
separate, as cbm_idx_offset is still in use.
Temporarily label all the entries in rdt_resources_all[] and copy
that value to struct resctrl_schema. Copying the value ensures there
is no mismatch while the filesystem parts of resctrl are modified
to use the schema. Once the resources are merged, the filesystem
code can assign this value based on the schema being created.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Padded the comment for CDP_NONE into kernel doc.

Changes since v3:
 * Removed a space.

Changes since v2:
 * Renamed CDP_BOTH as CDP_NONE and described as 'no prioritisation'
 * Shuffled commit message,

Changes since v1:
 * {cdp,conf}_type typo
 * Added kerneldoc comment
---
 arch/x86/kernel/cpu/resctrl/core.c     |  7 +++++++
 arch/x86/kernel/cpu/resctrl/internal.h |  2 ++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  1 +
 include/linux/resctrl.h                | 14 ++++++++++++++
 4 files changed, 24 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 10fbbc3cf40a..c5b5c7227837 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -62,6 +62,7 @@ mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
 struct rdt_hw_resource rdt_resources_all[] = {
 	[RDT_RESOURCE_L3] =
 	{
+		.conf_type			= CDP_NONE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3,
 			.name			= "L3",
@@ -81,6 +82,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 	[RDT_RESOURCE_L3DATA] =
 	{
+		.conf_type			= CDP_DATA,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3DATA,
 			.name			= "L3DATA",
@@ -100,6 +102,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 	[RDT_RESOURCE_L3CODE] =
 	{
+		.conf_type			= CDP_CODE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3CODE,
 			.name			= "L3CODE",
@@ -119,6 +122,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 	[RDT_RESOURCE_L2] =
 	{
+		.conf_type			= CDP_NONE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2,
 			.name			= "L2",
@@ -138,6 +142,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 	[RDT_RESOURCE_L2DATA] =
 	{
+		.conf_type			= CDP_DATA,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2DATA,
 			.name			= "L2DATA",
@@ -157,6 +162,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 	[RDT_RESOURCE_L2CODE] =
 	{
+		.conf_type			= CDP_CODE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2CODE,
 			.name			= "L2CODE",
@@ -176,6 +182,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 	[RDT_RESOURCE_MBA] =
 	{
+		.conf_type			= CDP_NONE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_MBA,
 			.name			= "MB",
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 94f4c683b7c3..b757928f9a46 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -369,6 +369,7 @@ struct rdt_parse_data {
 
 /**
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
+ * @conf_type:		The type that should be used when configuring. temporary
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
  * @num_closid:		Maximum number of closid this hardware can support.
  * @msr_base:		Base MSR address for CBMs
@@ -381,6 +382,7 @@ struct rdt_parse_data {
  * msr_update and msr_base.
  */
 struct rdt_hw_resource {
+	enum resctrl_conf_type	conf_type;
 	struct rdt_resource	r_resctrl;
 	int			num_closid;
 	unsigned int		msr_base;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1fc40dbce85d..d7fd0712e76c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2135,6 +2135,7 @@ static int schemata_list_create(void)
 			return -ENOMEM;
 
 		s->res = r;
+		s->conf_type = resctrl_to_arch_res(r)->conf_type;
 
 		INIT_LIST_HEAD(&s->list);
 		list_add(&s->list, &resctrl_schema_all);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5a21d483da6a..095ed48168d7 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -15,6 +15,18 @@ int proc_resctrl_show(struct seq_file *m,
 
 #endif
 
+/**
+ * enum resctrl_conf_type - The type of configuration.
+ * @CDP_NONE:	No prioritisation, both code and data are controlled or monitored.
+ * @CDP_CODE:	Configuration applies to instruction fetches.
+ * @CDP_DATA:	Configuration applies to reads and writes.
+ */
+enum resctrl_conf_type {
+	CDP_NONE,
+	CDP_CODE,
+	CDP_DATA,
+};
+
 /**
  * struct rdt_domain - group of CPUs sharing a resctrl resource
  * @list:		all instances of this resource
@@ -157,11 +169,13 @@ struct rdt_resource {
  * struct resctrl_schema - configuration abilities of a resource presented to
  *			   user-space
  * @list:	Member of resctrl_schema_all.
+ * @conf_type:	Whether this schema is specific to code/data.
  * @res:	The resource structure exported by the architecture to describe
  *		the hardware that is configured by this schema.
  */
 struct resctrl_schema {
 	struct list_head		list;
+	enum resctrl_conf_type		conf_type;
 	struct rdt_resource		*res;
 };
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 06/24] x86/resctrl: Walk the resctrl schema list instead of an arch list
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (4 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 05/24] x86/resctrl: Label the resources with their configuration type James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 07/24] x86/resctrl: Store the effective num_closid in the schema James Morse
                   ` (17 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

When parsing a schema configuration value from user-space, resctrl
walks the architectures rdt_resources_all[] array to find a
matching struct rdt_resource.

Once the CDP resources are merged there will be one resource in
use by two schema. Anything walking rdt_resources_all[] on behalf
of a user-space request should walk the list of struct resctrl_schema
instead.

Change the users of for_each_alloc_enabled_rdt_resource() to walk
the schema instead. Schema were only created for alloc_enabled resources
so these two lists are currently equivalent.
schemata_list_create() and rdt_kill_sb() are ignored. The first
creates the schema list, and will eventually loop over the resource
indexes using an arch helper to retrieve the resource. rdt_kill_sb()
will eventually make use of an arch 'reset everything' helper.
After the filesystem code is moved, rdtgroup_pseudo_locked_in_hierarchy()
remains part of the x86 specific hooks to support pseudo lock. This code
walks each domain, and still does this after the separate resources are
merged.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * No one can spell pseudo

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Expanded commit message
 * Split from a larger patch
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 23 +++++++++++++++--------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 18 ++++++++++++------
 2 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 08eef539cb6c..405b99d31ef9 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -287,10 +287,12 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
 				   struct rdtgroup *rdtgrp)
 {
 	struct rdt_hw_resource *hw_res;
+	struct resctrl_schema *s;
 	struct rdt_resource *r;
 
-	for_each_alloc_enabled_rdt_resource(r) {
-		hw_res = resctrl_to_arch_res(r);
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		hw_res = resctrl_to_arch_res(s->res);
 		if (!strcmp(resname, r->name) && rdtgrp->closid < hw_res->num_closid)
 			return parse_line(tok, r, rdtgrp);
 	}
@@ -301,6 +303,7 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off)
 {
+	struct resctrl_schema *s;
 	struct rdtgroup *rdtgrp;
 	struct rdt_domain *dom;
 	struct rdt_resource *r;
@@ -331,8 +334,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 		goto out;
 	}
 
-	for_each_alloc_enabled_rdt_resource(r) {
-		list_for_each_entry(dom, &r->domains, list)
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		list_for_each_entry(dom, &s->res->domains, list)
 			dom->have_new_ctrl = false;
 	}
 
@@ -353,7 +356,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 			goto out;
 	}
 
-	for_each_alloc_enabled_rdt_resource(r) {
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
 		ret = update_domains(r, rdtgrp->closid);
 		if (ret)
 			goto out;
@@ -401,6 +405,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v)
 {
 	struct rdt_hw_resource *hw_res;
+	struct resctrl_schema *schema;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
 	int ret = 0;
@@ -409,8 +414,10 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 	rdtgrp = rdtgroup_kn_lock_live(of->kn);
 	if (rdtgrp) {
 		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			for_each_alloc_enabled_rdt_resource(r)
+			list_for_each_entry(schema, &resctrl_schema_all, list) {
+				r = schema->res;
 				seq_printf(s, "%s:uninitialized\n", r->name);
+			}
 		} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
 			if (!rdtgrp->plr->d) {
 				rdt_last_cmd_clear();
@@ -424,8 +431,8 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			}
 		} else {
 			closid = rdtgrp->closid;
-			for_each_alloc_enabled_rdt_resource(r) {
-				hw_res = resctrl_to_arch_res(r);
+			list_for_each_entry(schema, &resctrl_schema_all, list) {
+				hw_res = resctrl_to_arch_res(schema->res);
 				if (closid < hw_res->num_closid)
 					show_doms(s, r, closid);
 			}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d7fd0712e76c..7502b7de3916 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -104,12 +104,12 @@ int closids_supported(void)
 static void closid_init(void)
 {
 	struct rdt_hw_resource *hw_res;
-	struct rdt_resource *r;
+	struct resctrl_schema *s;
 	int rdt_min_closid = 32;
 
 	/* Compute rdt_min_closid across all resources */
-	for_each_alloc_enabled_rdt_resource(r) {
-		hw_res = resctrl_to_arch_res(r);
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		hw_res = resctrl_to_arch_res(s->res);
 		rdt_min_closid = min(rdt_min_closid, hw_res->num_closid);
 	}
 
@@ -1276,11 +1276,13 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 {
 	struct rdt_hw_domain *hw_dom;
 	int closid = rdtgrp->closid;
+	struct resctrl_schema *s;
 	struct rdt_resource *r;
 	bool has_cache = false;
 	struct rdt_domain *d;
 
-	for_each_alloc_enabled_rdt_resource(r) {
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
 		if (r->rid == RDT_RESOURCE_MBA)
 			continue;
 		has_cache = true;
@@ -1418,6 +1420,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 static int rdtgroup_size_show(struct kernfs_open_file *of,
 			      struct seq_file *s, void *v)
 {
+	struct resctrl_schema *schema;
 	struct rdt_hw_domain *hw_dom;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
@@ -1449,7 +1452,8 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 		goto out;
 	}
 
-	for_each_alloc_enabled_rdt_resource(r) {
+	list_for_each_entry(schema, &resctrl_schema_all, list) {
+		r = schema->res;
 		sep = false;
 		seq_printf(s, "%*s:", max_name_width, r->name);
 		list_for_each_entry(d, &r->domains, list) {
@@ -2815,10 +2819,12 @@ static void rdtgroup_init_mba(struct rdt_resource *r)
 /* Initialize the RDT group's allocations. */
 static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
 {
+	struct resctrl_schema *s;
 	struct rdt_resource *r;
 	int ret;
 
-	for_each_alloc_enabled_rdt_resource(r) {
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
 		if (r->rid == RDT_RESOURCE_MBA) {
 			rdtgroup_init_mba(r);
 		} else {
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 07/24] x86/resctrl: Store the effective num_closid in the schema
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (5 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 06/24] x86/resctrl: Walk the resctrl schema list instead of an arch list James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 08/24] x86/resctrl: Add resctrl_arch_get_num_closid() James Morse
                   ` (16 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Struct resctrl_schema holds properties that vary with the style of
configuration that resctrl applies to a resource. There are already
two values for the hardware's num_closid, depending on whether the
architecture presents the L3 or L3CODE/L3DATA resources.

As the way CDP changes the number of control groups that resctrl can create
is part of the user-space interface, it should be managed by the filesystem
parts of resctrl. This allows the architecture code to only describe the
value the hardware supports.

Add num_closid to resctrl_schema. This is the value seen by the filesystem,
which may be different to the maximum value described by the arch code
when CDP is enabled.
These functions operate on the num_closid value that is exposed to
user-space:
* rdtgroup_parse_resource()
* rdtgroup_schemata_show()
* rdt_num_closids_show()
* closid_init()
These are changed to use the schema value instead. schemata_list_create()
sets this value, and reaches into the architecture specific structure to
get the value. This will eventually be replaced with a helper.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Fixed two spelling mistakes.

Changes since v2:
 * Expanded kerneldoc comment.
 * Shuffled commit message,

Changes since v1:
 * Added missing : in a comment.
 * Expanded commit message.
 * Reordered patches
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  9 +++------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 13 ++++---------
 include/linux/resctrl.h                   |  4 ++++
 3 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 405b99d31ef9..d10fddaef5f4 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -286,14 +286,12 @@ int update_domains(struct rdt_resource *r, int closid)
 static int rdtgroup_parse_resource(char *resname, char *tok,
 				   struct rdtgroup *rdtgrp)
 {
-	struct rdt_hw_resource *hw_res;
 	struct resctrl_schema *s;
 	struct rdt_resource *r;
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		r = s->res;
-		hw_res = resctrl_to_arch_res(s->res);
-		if (!strcmp(resname, r->name) && rdtgrp->closid < hw_res->num_closid)
+		if (!strcmp(resname, r->name) && rdtgrp->closid < s->num_closid)
 			return parse_line(tok, r, rdtgrp);
 	}
 	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
@@ -404,7 +402,6 @@ static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v)
 {
-	struct rdt_hw_resource *hw_res;
 	struct resctrl_schema *schema;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
@@ -432,8 +429,8 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 		} else {
 			closid = rdtgrp->closid;
 			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				hw_res = resctrl_to_arch_res(schema->res);
-				if (closid < hw_res->num_closid)
+				r = schema->res;
+				if (closid < schema->num_closid)
 					show_doms(s, r, closid);
 			}
 		}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 7502b7de3916..2f29b7d7d602 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -103,15 +103,12 @@ int closids_supported(void)
 
 static void closid_init(void)
 {
-	struct rdt_hw_resource *hw_res;
 	struct resctrl_schema *s;
 	int rdt_min_closid = 32;
 
 	/* Compute rdt_min_closid across all resources */
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		hw_res = resctrl_to_arch_res(s->res);
-		rdt_min_closid = min(rdt_min_closid, hw_res->num_closid);
-	}
+	list_for_each_entry(s, &resctrl_schema_all, list)
+		rdt_min_closid = min(rdt_min_closid, s->num_closid);
 
 	closid_free_map = BIT_MASK(rdt_min_closid) - 1;
 
@@ -849,11 +846,8 @@ static int rdt_num_closids_show(struct kernfs_open_file *of,
 				struct seq_file *seq, void *v)
 {
 	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-	struct rdt_hw_resource *hw_res;
 
-	hw_res = resctrl_to_arch_res(r);
-	seq_printf(seq, "%d\n", hw_res->num_closid);
+	seq_printf(seq, "%u\n", s->num_closid);
 	return 0;
 }
 
@@ -2140,6 +2134,7 @@ static int schemata_list_create(void)
 
 		s->res = r;
 		s->conf_type = resctrl_to_arch_res(r)->conf_type;
+		s->num_closid = resctrl_to_arch_res(r)->num_closid;
 
 		INIT_LIST_HEAD(&s->list);
 		list_add(&s->list, &resctrl_schema_all);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 095ed48168d7..59d0fa78bb69 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -172,10 +172,14 @@ struct rdt_resource {
  * @conf_type:	Whether this schema is specific to code/data.
  * @res:	The resource structure exported by the architecture to describe
  *		the hardware that is configured by this schema.
+ * @num_closid:	The number of closid that can be used with this schema. When
+ *		features like CDP are enabled, this will be lower than the
+ *		hardware supports for the resource.
  */
 struct resctrl_schema {
 	struct list_head		list;
 	enum resctrl_conf_type		conf_type;
 	struct rdt_resource		*res;
+	int				num_closid;
 };
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 08/24] x86/resctrl: Add resctrl_arch_get_num_closid()
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (6 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 07/24] x86/resctrl: Store the effective num_closid in the schema James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 09/24] x86/resctrl: Pass the schema to resctrl filesystem functions James Morse
                   ` (15 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

To initialise struct resctrl_schema's num_closid, schemata_list_create()
reaches into the architectures private structure to retrieve num_closid
from the struct rdt_hw_resource. The 'half the closids' behaviour
should be part of the filesystem parts of resctrl that are the same
on any architecture. struct resctrl_schema's num_closid should
include any correction for CDP.

Having two properties called num_closid is likely to be confusing when
they have different values.

Add a helper to read the resource's num_closid from the arch code. This
should return the number of closid that the resource supports, regardless
of whether CDP is in use. Once the CDP resources are merged,
schemata_list_create() can apply the correction itself.
Using a type with an obvious size for the arch helper means changing
the type of num_closid to u32, which matches the type already used by
struct rdtgroup.

reset_all_ctrls() does not use resctrl_arch_get_num_closid(), even
though it sets up a structure for modifying the hardware. This function
will be part of the architecture code, the maximum closid should be the
maximum value the hardware has, regardless of the way resctrl is using
it. All the uses of num_closid in core.c are naturally part of the
architecture specific code.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Fixed a spelling mistake, removed four spaces.

Changes since v2:
 * Added comment in rdt_hw_resource
 * Shuffled commit message,

Changes since v1:
 * Rewrote commit message
 * Whitespace fixes
 * num_closid becomes u32 in all occurrences to reduce surprises
---
 arch/x86/kernel/cpu/resctrl/core.c     | 5 +++++
 arch/x86/kernel/cpu/resctrl/internal.h | 8 ++++++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 4 ++--
 include/linux/resctrl.h                | 6 +++++-
 4 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index c5b5c7227837..26e8d20cd072 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -450,6 +450,11 @@ struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
 	return NULL;
 }
 
+u32 resctrl_arch_get_num_closid(struct rdt_resource *r)
+{
+	return resctrl_to_arch_res(r)->num_closid;
+}
+
 void rdt_ctrl_update(void *arg)
 {
 	struct msr_param *m = arg;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index b757928f9a46..199ac3d55045 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -371,7 +371,11 @@ struct rdt_parse_data {
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
  * @conf_type:		The type that should be used when configuring. temporary
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
- * @num_closid:		Maximum number of closid this hardware can support.
+ * @num_closid:		Maximum number of closid this hardware can support,
+ *			regardless of CDP. This is exposed via
+ *			resctrl_arch_get_num_closid() to avoid confusion
+ *			with struct resctrl_schema's property of the same name,
+ *			which has been corrected for features like CDP.
  * @msr_base:		Base MSR address for CBMs
  * @msr_update:		Function pointer to update QOS MSRs
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
@@ -384,7 +388,7 @@ struct rdt_parse_data {
 struct rdt_hw_resource {
 	enum resctrl_conf_type	conf_type;
 	struct rdt_resource	r_resctrl;
-	int			num_closid;
+	u32			num_closid;
 	unsigned int		msr_base;
 	void (*msr_update)	(struct rdt_domain *d, struct msr_param *m,
 				 struct rdt_resource *r);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2f29b7d7d602..09ffe9a4a32b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -104,7 +104,7 @@ int closids_supported(void)
 static void closid_init(void)
 {
 	struct resctrl_schema *s;
-	int rdt_min_closid = 32;
+	u32 rdt_min_closid = 32;
 
 	/* Compute rdt_min_closid across all resources */
 	list_for_each_entry(s, &resctrl_schema_all, list)
@@ -2134,7 +2134,7 @@ static int schemata_list_create(void)
 
 		s->res = r;
 		s->conf_type = resctrl_to_arch_res(r)->conf_type;
-		s->num_closid = resctrl_to_arch_res(r)->num_closid;
+		s->num_closid = resctrl_arch_get_num_closid(r);
 
 		INIT_LIST_HEAD(&s->list);
 		list_add(&s->list, &resctrl_schema_all);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 59d0fa78bb69..b9d200592e54 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -180,6 +180,10 @@ struct resctrl_schema {
 	struct list_head		list;
 	enum resctrl_conf_type		conf_type;
 	struct rdt_resource		*res;
-	int				num_closid;
+	u32				num_closid;
 };
+
+/* The number of closid supported by this resource regardless of CDP */
+u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
+
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 09/24] x86/resctrl: Pass the schema to resctrl filesystem functions
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (7 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 08/24] x86/resctrl: Add resctrl_arch_get_num_closid() James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 10/24] x86/resctrl: Swizzle rdt_resource and resctrl_schema in pseudo_lock_region James Morse
                   ` (14 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Once the CDP resources are merged, there will be two struct
resctrl_schema for one struct rdt_resource. CDP becomes a type of
configuration that belongs to the schema.

Helpers like rdtgroup_cbm_overlaps() need access to the schema to
query the configuration (or configurations) based on schema properties.

Change these functions to take a struct schema instead of the
struct rdt_resource. All the modified functions are part of the filesystem
code that will move to /fs/resctrl once it is possible to support a
second architecture.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Fixed a typo.

No changes since v3.

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * split from a larger patch
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 23 +++++++++++++----------
 arch/x86/kernel/cpu/resctrl/internal.h    |  6 +++---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 19 +++++++++++--------
 include/linux/resctrl.h                   |  3 ++-
 4 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index d10fddaef5f4..219b057e65b0 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -57,9 +57,10 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
 	return true;
 }
 
-int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 	     struct rdt_domain *d)
 {
+	struct rdt_resource *r = s->res;
 	unsigned long bw_val;
 
 	if (d->have_new_ctrl) {
@@ -125,10 +126,11 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
  * Read one cache bit mask (hex). Check that it is valid for the current
  * resource type.
  */
-int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	      struct rdt_domain *d)
 {
 	struct rdtgroup *rdtgrp = data->rdtgrp;
+	struct rdt_resource *r = s->res;
 	u32 cbm_val;
 
 	if (d->have_new_ctrl) {
@@ -160,12 +162,12 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	 * The CBM may not overlap with the CBM of another closid if
 	 * either is exclusive.
 	 */
-	if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, true)) {
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
 		rdt_last_cmd_puts("Overlaps with exclusive group\n");
 		return -EINVAL;
 	}
 
-	if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
 		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
 		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 			rdt_last_cmd_puts("Overlaps with other group\n");
@@ -185,9 +187,10 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
  * separated by ";". The "id" is in decimal, and must match one of
  * the "id"s for this resource.
  */
-static int parse_line(char *line, struct rdt_resource *r,
+static int parse_line(char *line, struct resctrl_schema *s,
 		      struct rdtgroup *rdtgrp)
 {
+	struct rdt_resource *r = s->res;
 	struct rdt_parse_data data;
 	char *dom = NULL, *id;
 	struct rdt_domain *d;
@@ -213,7 +216,7 @@ static int parse_line(char *line, struct rdt_resource *r,
 		if (d->id == dom_id) {
 			data.buf = dom;
 			data.rdtgrp = rdtgrp;
-			if (r->parse_ctrlval(&data, r, d))
+			if (r->parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
 				/*
@@ -292,7 +295,7 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		r = s->res;
 		if (!strcmp(resname, r->name) && rdtgrp->closid < s->num_closid)
-			return parse_line(tok, r, rdtgrp);
+			return parse_line(tok, s, rdtgrp);
 	}
 	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
 	return -EINVAL;
@@ -377,8 +380,9 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
-static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
+static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
 {
+	struct rdt_resource *r = schema->res;
 	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *dom;
 	bool sep = false;
@@ -429,9 +433,8 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 		} else {
 			closid = rdtgrp->closid;
 			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				r = schema->res;
 				if (closid < schema->num_closid)
-					show_doms(s, r, closid);
+					show_doms(s, schema, closid);
 			}
 		}
 	} else {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 199ac3d55045..299c1960eae7 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -401,9 +401,9 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 	return container_of(r, struct rdt_hw_resource, r_resctrl);
 }
 
-int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	      struct rdt_domain *d);
-int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 	     struct rdt_domain *d);
 
 extern struct mutex rdtgroup_mutex;
@@ -506,7 +506,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v);
-bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
 			   unsigned long cbm, int closid, bool exclusive);
 unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
 				  unsigned long cbm);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 09ffe9a4a32b..53d281a9f54f 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1221,7 +1221,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 
 /**
  * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
- * @r: Resource to which domain instance @d belongs.
+ * @s: Schema for the resource to which domain instance @d belongs.
  * @d: The domain instance for which @closid is being tested.
  * @cbm: Capacity bitmask being tested.
  * @closid: Intended closid for @cbm.
@@ -1239,9 +1239,10 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
  *
  * Return: true if CBM overlap detected, false if there is no overlap
  */
-bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
 			   unsigned long cbm, int closid, bool exclusive)
 {
+	struct rdt_resource *r = s->res;
 	struct rdt_resource *r_cdp;
 	struct rdt_domain *d_cdp;
 
@@ -1282,7 +1283,8 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 		has_cache = true;
 		list_for_each_entry(d, &r->domains, list) {
 			hw_dom = resctrl_to_arch_dom(d);
-			if (rdtgroup_cbm_overlaps(r, d, hw_dom->ctrl_val[closid],
+			if (rdtgroup_cbm_overlaps(s, d,
+						  hw_dom->ctrl_val[closid],
 						  rdtgrp->closid, false)) {
 				rdt_last_cmd_puts("Schemata overlaps\n");
 				return false;
@@ -2712,11 +2714,12 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
  * Set the RDT domain up to start off with all usable allocations. That is,
  * all shareable and unused bits. All-zero CBM is invalid.
  */
-static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
+static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 				 u32 closid)
 {
 	struct rdt_resource *r_cdp = NULL;
 	struct rdt_domain *d_cdp = NULL;
+	struct rdt_resource *r = s->res;
 	u32 used_b = 0, unused_b = 0;
 	unsigned long tmp_cbm;
 	enum rdtgrp_mode mode;
@@ -2786,13 +2789,13 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
  * If there are no more shareable bits available on any domain then
  * the entire allocation will fail.
  */
-static int rdtgroup_init_cat(struct rdt_resource *r, u32 closid)
+static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 {
 	struct rdt_domain *d;
 	int ret;
 
-	list_for_each_entry(d, &r->domains, list) {
-		ret = __init_one_rdt_domain(d, r, closid);
+	list_for_each_entry(d, &s->res->domains, list) {
+		ret = __init_one_rdt_domain(d, s, closid);
 		if (ret < 0)
 			return ret;
 	}
@@ -2823,7 +2826,7 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
 		if (r->rid == RDT_RESOURCE_MBA) {
 			rdtgroup_init_mba(r);
 		} else {
-			ret = rdtgroup_init_cat(r, rdtgrp->closid);
+			ret = rdtgroup_init_cat(s, rdtgrp->closid);
 			if (ret < 0)
 				return ret;
 		}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b9d200592e54..979592c869e6 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -121,6 +121,7 @@ struct resctrl_membw {
 };
 
 struct rdt_parse_data;
+struct resctrl_schema;
 
 /**
  * struct rdt_resource - attributes of a resctrl resource
@@ -158,7 +159,7 @@ struct rdt_resource {
 	u32			default_ctrl;
 	const char		*format_str;
 	int			(*parse_ctrlval)(struct rdt_parse_data *data,
-						 struct rdt_resource *r,
+						 struct resctrl_schema *s,
 						 struct rdt_domain *d);
 	struct list_head	evt_list;
 	unsigned long		fflags;
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 10/24] x86/resctrl: Swizzle rdt_resource and resctrl_schema in pseudo_lock_region
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (8 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 09/24] x86/resctrl: Pass the schema to resctrl filesystem functions James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 11/24] x86/resctrl: Add a helper to read/set the CDP configuration James Morse
                   ` (13 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

struct pseudo_lock_region points to the rdt_resource.

Once the resources are merged, this won't be unique. The resource name
is moving into the schema, so that the filesystem portions of resctrl can
generate it.

Swap pseudo_lock_region's rdt_resource pointer for a schema pointer.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * Shuffled commit message,
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 4 ++--
 arch/x86/kernel/cpu/resctrl/internal.h    | 6 +++---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 8 ++++----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 4 ++--
 4 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 219b057e65b0..0ee1ded5b8ff 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -227,7 +227,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 				 * the required initialization for single
 				 * region and return.
 				 */
-				rdtgrp->plr->r = r;
+				rdtgrp->plr->s = s;
 				rdtgrp->plr->d = d;
 				rdtgrp->plr->cbm = d->new_ctrl;
 				d->plr = rdtgrp->plr;
@@ -426,7 +426,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 				ret = -ENODEV;
 			} else {
 				seq_printf(s, "%s:%d=%x\n",
-					   rdtgrp->plr->r->name,
+					   rdtgrp->plr->s->res->name,
 					   rdtgrp->plr->d->id,
 					   rdtgrp->plr->cbm);
 			}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 299c1960eae7..f2e370ff4b4e 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -163,8 +163,8 @@ struct mongroup {
 
 /**
  * struct pseudo_lock_region - pseudo-lock region information
- * @r:			RDT resource to which this pseudo-locked region
- *			belongs
+ * @s:			Resctrl schema for the resource to which this
+ *			pseudo-locked region belongs
  * @d:			RDT domain to which this pseudo-locked region
  *			belongs
  * @cbm:		bitmask of the pseudo-locked region
@@ -184,7 +184,7 @@ struct mongroup {
  * @pm_reqs:		Power management QoS requests related to this region
  */
 struct pseudo_lock_region {
-	struct rdt_resource	*r;
+	struct resctrl_schema	*s;
 	struct rdt_domain	*d;
 	u32			cbm;
 	wait_queue_head_t	lock_thread_wq;
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 17868acd9b9c..3c035a7fa61d 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -250,7 +250,7 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
 	plr->line_size = 0;
 	kfree(plr->kmem);
 	plr->kmem = NULL;
-	plr->r = NULL;
+	plr->s = NULL;
 	if (plr->d)
 		plr->d->plr = NULL;
 	plr->d = NULL;
@@ -294,10 +294,10 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 
 	ci = get_cpu_cacheinfo(plr->cpu);
 
-	plr->size = rdtgroup_cbm_to_size(plr->r, plr->d, plr->cbm);
+	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
 
 	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == plr->r->cache_level) {
+		if (ci->info_list[i].level == plr->s->res->cache_level) {
 			plr->line_size = ci->info_list[i].coherency_line_size;
 			return 0;
 		}
@@ -800,7 +800,7 @@ bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm
 	unsigned long cbm_b;
 
 	if (d->plr) {
-		cbm_len = d->plr->r->cache.cbm_len;
+		cbm_len = d->plr->s->res->cache.cbm_len;
 		cbm_b = d->plr->cbm;
 		if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
 			return true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 53d281a9f54f..305dcf8850a0 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1439,8 +1439,8 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 			ret = -ENODEV;
 		} else {
 			seq_printf(s, "%*s:", max_name_width,
-				   rdtgrp->plr->r->name);
-			size = rdtgroup_cbm_to_size(rdtgrp->plr->r,
+				   rdtgrp->plr->s->res->name);
+			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
 						    rdtgrp->plr->d,
 						    rdtgrp->plr->cbm);
 			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size);
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 11/24] x86/resctrl: Add a helper to read/set the CDP configuration
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (9 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 10/24] x86/resctrl: Swizzle rdt_resource and resctrl_schema in pseudo_lock_region James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 12/24] x86/resctrl: Move the schemata names into struct resctrl_schema James Morse
                   ` (12 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Whether CDP is enabled for a hardware resource like the L3 cache can
be found by inspecting the alloc_enabled flags of the L3CODE/L3DATA
struct rdt_hw_resources, even if they aren't in use.

Once these resources are merged, the flags can't be compared. Whether
CDP is enabled needs tracking explicitly. If another architecture is
emulating CDP the behaviour may not be per-resource. 'cdp_capable'
needs to be visible to resctrl, even if its not in use, as this
affects the padding of the schemata table visible to user-space.

Add cdp_enabled to struct rdt_hw_resource and cdp_capable to struct
rdt_resource. Add resctrl_arch_set_cdp_enabled() to let resctrl enable
or disable CDP on a resource. resctrl_arch_get_cdp_enabled() lets it
read the current state.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Moved cdp_capable to be visible outside the arch specific struct.
 * Moved this patch earlier in the series.

Changes since v3:
 * Fixed a spelling mistake.

Changes since v2:
 * Merged rdt_domain_reconfigure_cdp() changes here.
 * Shuffled commit message,

Changes since v1:
 * Added prototype for resctrl_arch_set_cdp_enabled()
 * s/Currently/Previously/
 * rdt_get_cdp_config() accesses the array directly as most of the code
   here disappears once the resources are merged.

It isn't practical for MPAM to hide the CDP emulation by applying the same
'L3' configuration to the two closid that are in use, as this would
then consume two monitors, which are likely to be in short supply.
---
 arch/x86/kernel/cpu/resctrl/core.c        |  4 ++
 arch/x86/kernel/cpu/resctrl/internal.h    | 11 +++-
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  4 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 75 +++++++++++++----------
 include/linux/resctrl.h                   |  3 +-
 5 files changed, 62 insertions(+), 35 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 26e8d20cd072..87b5aa7683ee 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -374,6 +374,10 @@ static void rdt_get_cdp_config(int level, int type)
 	 * "cdp" during resctrl file system mount time.
 	 */
 	r->alloc_enabled = false;
+	rdt_resources_all[level].cdp_enabled = false;
+	rdt_resources_all[type].cdp_enabled = false;
+	r_l->cdp_capable = true;
+	r->cdp_capable = true;
 }
 
 static void rdt_get_cdp_l3_config(void)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index f2e370ff4b4e..b8b45bae4b5b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -380,6 +380,7 @@ struct rdt_parse_data {
  * @msr_update:		Function pointer to update QOS MSRs
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
  * @mbm_width:		Monitor width, to detect and correct for overflow.
+ * @cdp_enabled:	CDP state of this resource
  *
  * Members of this structure are either private to the architecture
  * e.g. mbm_width, or accessed via helpers that provide abstraction. e.g.
@@ -394,6 +395,7 @@ struct rdt_hw_resource {
 				 struct rdt_resource *r);
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
+	bool			cdp_enabled;
 };
 
 static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r)
@@ -414,7 +416,7 @@ DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 
 extern struct dentry *debugfs_resctrl;
 
-enum {
+enum resctrl_res_level {
 	RDT_RESOURCE_L3,
 	RDT_RESOURCE_L3DATA,
 	RDT_RESOURCE_L3CODE,
@@ -435,6 +437,13 @@ static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
 	return &hw_res->r_resctrl;
 }
 
+static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
+{
+	return rdt_resources_all[l].cdp_enabled;
+}
+
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
+
 /*
  * To return the common struct rdt_resource, which is contained in struct
  * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 3c035a7fa61d..db813f819ad6 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -688,8 +688,8 @@ int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
 	 *   resource, the portion of cache used by it should be made
 	 *   unavailable to all future allocations from both resources.
 	 */
-	if (rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl.alloc_enabled ||
-	    rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl.alloc_enabled) {
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
+	    resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
 		rdt_last_cmd_puts("CDP enabled\n");
 		return -EINVAL;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 305dcf8850a0..cc9dacd73438 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1940,14 +1940,16 @@ static int set_cache_qos_cfg(int level, bool enable)
 /* Restore the qos cfg state when a domain comes online */
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 {
-	if (!r->alloc_capable)
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+
+	if (!r->cdp_capable)
 		return;
 
 	if (r == &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl)
-		l2_qos_cfg_update(&r->alloc_enabled);
+		l2_qos_cfg_update(&hw_res->cdp_enabled);
 
 	if (r == &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl)
-		l3_qos_cfg_update(&r->alloc_enabled);
+		l3_qos_cfg_update(&hw_res->cdp_enabled);
 }
 
 /*
@@ -1991,51 +1993,62 @@ static int cdp_enable(int level, int data_type, int code_type)
 		r_l->alloc_enabled = false;
 		r_ldata->alloc_enabled = true;
 		r_lcode->alloc_enabled = true;
+		rdt_resources_all[level].cdp_enabled = true;
+		rdt_resources_all[data_type].cdp_enabled = true;
+		rdt_resources_all[code_type].cdp_enabled = true;
 	}
 	return ret;
 }
 
-static int cdpl3_enable(void)
-{
-	return cdp_enable(RDT_RESOURCE_L3, RDT_RESOURCE_L3DATA,
-			  RDT_RESOURCE_L3CODE);
-}
-
-static int cdpl2_enable(void)
-{
-	return cdp_enable(RDT_RESOURCE_L2, RDT_RESOURCE_L2DATA,
-			  RDT_RESOURCE_L2CODE);
-}
-
 static void cdp_disable(int level, int data_type, int code_type)
 {
-	struct rdt_resource *r = &rdt_resources_all[level].r_resctrl;
+	struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
+	struct rdt_resource *r = &r_hw->r_resctrl;
 
 	r->alloc_enabled = r->alloc_capable;
 
-	if (rdt_resources_all[data_type].r_resctrl.alloc_enabled) {
+	if (r_hw->cdp_enabled) {
 		rdt_resources_all[data_type].r_resctrl.alloc_enabled = false;
 		rdt_resources_all[code_type].r_resctrl.alloc_enabled = false;
 		set_cache_qos_cfg(level, false);
+		r_hw->cdp_enabled = false;
+		rdt_resources_all[data_type].cdp_enabled = false;
+		rdt_resources_all[code_type].cdp_enabled = false;
 	}
 }
 
-static void cdpl3_disable(void)
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
 {
-	cdp_disable(RDT_RESOURCE_L3, RDT_RESOURCE_L3DATA, RDT_RESOURCE_L3CODE);
-}
+	struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
+	enum resctrl_res_level code_type, data_type;
 
-static void cdpl2_disable(void)
-{
-	cdp_disable(RDT_RESOURCE_L2, RDT_RESOURCE_L2DATA, RDT_RESOURCE_L2CODE);
+	if (!hw_res->r_resctrl.cdp_capable)
+		return -EINVAL;
+
+	if (l == RDT_RESOURCE_L3) {
+		code_type = RDT_RESOURCE_L3CODE;
+		data_type = RDT_RESOURCE_L3DATA;
+	} else if (l == RDT_RESOURCE_L2) {
+		code_type = RDT_RESOURCE_L2CODE;
+		data_type = RDT_RESOURCE_L2DATA;
+	} else {
+		return -EINVAL;
+	}
+
+	if (enable)
+		return cdp_enable(l, data_type, code_type);
+
+	cdp_disable(l, data_type, code_type);
+
+	return 0;
 }
 
 static void cdp_disable_all(void)
 {
-	if (rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl.alloc_enabled)
-		cdpl3_disable();
-	if (rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl.alloc_enabled)
-		cdpl2_disable();
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
+		resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
+		resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
 }
 
 /*
@@ -2113,10 +2126,10 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx)
 	int ret = 0;
 
 	if (ctx->enable_cdpl2)
-		ret = cdpl2_enable();
+		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
 
 	if (!ret && ctx->enable_cdpl3)
-		ret = cdpl3_enable();
+		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
 
 	if (!ret && ctx->enable_mba_mbps)
 		ret = set_mba_sc(true);
@@ -3199,10 +3212,10 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)
 
 static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
 {
-	if (rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl.alloc_enabled)
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
 		seq_puts(seq, ",cdp");
 
-	if (rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl.alloc_enabled)
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
 		seq_puts(seq, ",cdpl2");
 
 	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 979592c869e6..4b30571fbc8e 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -142,6 +142,7 @@ struct resctrl_schema;
  * @parse_ctrlval:	Per resource function pointer to parse control values
  * @evt_list:		List of monitoring events
  * @fflags:		flags to choose base and info files
+ * @cdp_capable:	Is the CDP feature available on this resource
  */
 struct rdt_resource {
 	int			rid;
@@ -163,7 +164,7 @@ struct rdt_resource {
 						 struct rdt_domain *d);
 	struct list_head	evt_list;
 	unsigned long		fflags;
-
+	bool			cdp_capable;
 };
 
 /**
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 12/24] x86/resctrl: Move the schemata names into struct resctrl_schema
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (10 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 11/24] x86/resctrl: Add a helper to read/set the CDP configuration James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 13/24] x86/resctrl: Group staged configuration into a separate struct James Morse
                   ` (11 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

resctrl 'info' directories and schema parsing use the schema name.
This lives in the struct rdt_resource, and is specified by the
architecture code.

Once the CDP resources are merged, there will only be one resource
(and one name) in use by two schema. To allow the CDP CODE/DATA
property to be the type of configuration the schema uses, the
name should also be per-schema.

Add a name field to struct resctrl_schema, and use this wherever
the schema name is exposed (or read from) user-space. Calculating
max_name_width for padding the schemata file also moves as this is
visible to user-space. As the names in struct rdt_resource already
include the CDP information, schemata_list_create() copies them.
schemata_list_create() includes the length of the CDP suffix when
calculating max_name_width in preparation for CDP resources being
merged.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Fixed a typo
 * Add the length of the CDP suffix when the resource is capable but CDP
   is not enabled.

Changes since v3:
 * Removed a space,

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Don't hardcode max_name_width, that leads to bugs
 * Move max_name_width to live with the code that will generate the name.
 * Fixed name/names typo
---
 arch/x86/kernel/cpu/resctrl/core.c        |  5 ----
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 10 +++-----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 29 +++++++++++++++++++----
 include/linux/resctrl.h                   |  2 ++
 4 files changed, 30 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 87b5aa7683ee..755118a9ef38 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -782,13 +782,8 @@ static int resctrl_offline_cpu(unsigned int cpu)
 static __init void rdt_init_padding(void)
 {
 	struct rdt_resource *r;
-	int cl;
 
 	for_each_alloc_capable_rdt_resource(r) {
-		cl = strlen(r->name);
-		if (cl > max_name_width)
-			max_name_width = cl;
-
 		if (r->data_width > max_data_width)
 			max_data_width = r->data_width;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 0ee1ded5b8ff..104b285f8a60 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -290,11 +290,9 @@ static int rdtgroup_parse_resource(char *resname, char *tok,
 				   struct rdtgroup *rdtgrp)
 {
 	struct resctrl_schema *s;
-	struct rdt_resource *r;
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		if (!strcmp(resname, r->name) && rdtgrp->closid < s->num_closid)
+		if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
 			return parse_line(tok, s, rdtgrp);
 	}
 	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
@@ -388,7 +386,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 	bool sep = false;
 	u32 ctrl_val;
 
-	seq_printf(s, "%*s:", max_name_width, r->name);
+	seq_printf(s, "%*s:", max_name_width, schema->name);
 	list_for_each_entry(dom, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(dom);
 		if (sep)
@@ -408,7 +406,6 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 {
 	struct resctrl_schema *schema;
 	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
 	int ret = 0;
 	u32 closid;
 
@@ -416,8 +413,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 	if (rdtgrp) {
 		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				r = schema->res;
-				seq_printf(s, "%s:uninitialized\n", r->name);
+				seq_printf(s, "%s:uninitialized\n", schema->name);
 			}
 		} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
 			if (!rdtgrp->plr->d) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cc9dacd73438..1f8c8d79d00b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1439,7 +1439,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 			ret = -ENODEV;
 		} else {
 			seq_printf(s, "%*s:", max_name_width,
-				   rdtgrp->plr->s->res->name);
+				   rdtgrp->plr->s->name);
 			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
 						    rdtgrp->plr->d,
 						    rdtgrp->plr->cbm);
@@ -1451,7 +1451,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 	list_for_each_entry(schema, &resctrl_schema_all, list) {
 		r = schema->res;
 		sep = false;
-		seq_printf(s, "%*s:", max_name_width, r->name);
+		seq_printf(s, "%*s:", max_name_width, schema->name);
 		list_for_each_entry(d, &r->domains, list) {
 			hw_dom = resctrl_to_arch_dom(d);
 			if (sep)
@@ -1823,7 +1823,7 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		r = s->res;
 		fflags =  r->fflags | RF_CTRL_INFO;
-		ret = rdtgroup_mkdir_info_resdir(s, r->name, fflags);
+		ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
 		if (ret)
 			goto out_destroy;
 	}
@@ -2141,6 +2141,7 @@ static int schemata_list_create(void)
 {
 	struct resctrl_schema *s;
 	struct rdt_resource *r;
+	int ret, cl;
 
 	for_each_alloc_enabled_rdt_resource(r) {
 		s = kzalloc(sizeof(*s), GFP_KERNEL);
@@ -2151,6 +2152,26 @@ static int schemata_list_create(void)
 		s->conf_type = resctrl_to_arch_res(r)->conf_type;
 		s->num_closid = resctrl_arch_get_num_closid(r);
 
+		ret = snprintf(s->name, sizeof(s->name), r->name);
+		if (ret >= sizeof(s->name)) {
+			kfree(s);
+			return -EINVAL;
+		}
+
+		cl = strlen(s->name);
+
+		/*
+		 * If CDP is supported by this resource, but not enabled,
+		 * include the suffix. This ensures the tabular format of the
+		 * schemata file does not change between mounts of the
+		 * filesystem.
+		 */
+		if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
+			cl += 4;
+
+		if (cl > max_name_width)
+			max_name_width = cl;
+
 		INIT_LIST_HEAD(&s->list);
 		list_add(&s->list, &resctrl_schema_all);
 	}
@@ -2784,7 +2805,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	 */
 	tmp_cbm = d->new_ctrl;
 	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
-		rdt_last_cmd_printf("No space on %s:%d\n", r->name, d->id);
+		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
 		return -ENOSPC;
 	}
 	d->have_new_ctrl = true;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 4b30571fbc8e..e482ce790ce2 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -171,6 +171,7 @@ struct rdt_resource {
  * struct resctrl_schema - configuration abilities of a resource presented to
  *			   user-space
  * @list:	Member of resctrl_schema_all.
+ * @name:	The name to use in the "schemata" file.
  * @conf_type:	Whether this schema is specific to code/data.
  * @res:	The resource structure exported by the architecture to describe
  *		the hardware that is configured by this schema.
@@ -180,6 +181,7 @@ struct rdt_resource {
  */
 struct resctrl_schema {
 	struct list_head		list;
+	char				name[8];
 	enum resctrl_conf_type		conf_type;
 	struct rdt_resource		*res;
 	u32				num_closid;
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 13/24] x86/resctrl: Group staged configuration into a separate struct
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (11 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 12/24] x86/resctrl: Move the schemata names into struct resctrl_schema James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 14/24] x86/resctrl: Allow different CODE/DATA configurations to be staged James Morse
                   ` (10 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

When configuration changes are made, the new value is written
to struct rdt_domain's new_ctrl field and the have_new_ctrl flag
is set. Later new_ctrl is copied to hardware by a call to
update_domains().

Once the CDP resources are merged, there will be one new_ctrl
field in use by two struct resctrl_schema requiring a per-schema
IPI to copy the value to hardware.

Move new_ctrl and have_new_ctrl into a new struct resctrl_staged_config.
Before the CDP resources can be merged, struct rdt_domain will
need an array of these, one per type of configuration. Using the
type as an index to the array will ensure that a schema configuration
string can't specify the same domain twice.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Fixed a typo.

No changes since v3.

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Expanded commit message
 * Removed explicit clearing of have_new_ctrl,
 * Moved ARRAY_SIZE() trickery to a later patch
 * Removed extra whitespace
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 43 +++++++++++++++--------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 22 +++++++-----
 include/linux/resctrl.h                   | 16 ++++++---
 3 files changed, 54 insertions(+), 27 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 104b285f8a60..9ddfa7607234 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -62,16 +62,17 @@ int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 {
 	struct rdt_resource *r = s->res;
 	unsigned long bw_val;
+	struct resctrl_staged_config *cfg = &d->staged_config;
 
-	if (d->have_new_ctrl) {
+	if (cfg->have_new_ctrl) {
 		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
 		return -EINVAL;
 	}
 
 	if (!bw_validate(data->buf, &bw_val, r))
 		return -EINVAL;
-	d->new_ctrl = bw_val;
-	d->have_new_ctrl = true;
+	cfg->new_ctrl = bw_val;
+	cfg->have_new_ctrl = true;
 
 	return 0;
 }
@@ -129,11 +130,12 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	      struct rdt_domain *d)
 {
+	struct resctrl_staged_config *cfg = &d->staged_config;
 	struct rdtgroup *rdtgrp = data->rdtgrp;
 	struct rdt_resource *r = s->res;
 	u32 cbm_val;
 
-	if (d->have_new_ctrl) {
+	if (cfg->have_new_ctrl) {
 		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
 		return -EINVAL;
 	}
@@ -175,8 +177,8 @@ int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 		}
 	}
 
-	d->new_ctrl = cbm_val;
-	d->have_new_ctrl = true;
+	cfg->new_ctrl = cbm_val;
+	cfg->have_new_ctrl = true;
 
 	return 0;
 }
@@ -190,6 +192,7 @@ int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 static int parse_line(char *line, struct resctrl_schema *s,
 		      struct rdtgroup *rdtgrp)
 {
+	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	struct rdt_parse_data data;
 	char *dom = NULL, *id;
@@ -219,6 +222,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 			if (r->parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
+				cfg = &d->staged_config;
 				/*
 				 * In pseudo-locking setup mode and just
 				 * parsed a valid CBM that should be
@@ -229,7 +233,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 				 */
 				rdtgrp->plr->s = s;
 				rdtgrp->plr->d = d;
-				rdtgrp->plr->cbm = d->new_ctrl;
+				rdtgrp->plr->cbm = cfg->new_ctrl;
 				d->plr = rdtgrp->plr;
 				return 0;
 			}
@@ -239,14 +243,27 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	return -EINVAL;
 }
 
+static void apply_config(struct rdt_hw_domain *hw_dom,
+			 struct resctrl_staged_config *cfg, int closid,
+			 cpumask_var_t cpu_mask, bool mba_sc)
+{
+	struct rdt_domain *dom = &hw_dom->d_resctrl;
+	u32 *dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
+
+	if (cfg->new_ctrl != dc[closid]) {
+		cpumask_set_cpu(cpumask_any(&dom->cpu_mask), cpu_mask);
+		dc[closid] = cfg->new_ctrl;
+	}
+}
+
 int update_domains(struct rdt_resource *r, int closid)
 {
+	struct resctrl_staged_config *cfg;
 	struct rdt_hw_domain *hw_dom;
 	struct msr_param msr_param;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
 	bool mba_sc;
-	u32 *dc;
 	int cpu;
 
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
@@ -259,11 +276,9 @@ int update_domains(struct rdt_resource *r, int closid)
 	mba_sc = is_mba_sc(r);
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
-		dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
-		if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
-			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
-			dc[closid] = d->new_ctrl;
-		}
+		cfg = &hw_dom->d_resctrl.staged_config;
+		if (cfg->have_new_ctrl)
+			apply_config(hw_dom, cfg, closid, cpu_mask, mba_sc);
 	}
 
 	/*
@@ -335,7 +350,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		list_for_each_entry(dom, &s->res->domains, list)
-			dom->have_new_ctrl = false;
+			memset(&dom->staged_config, 0, sizeof(dom->staged_config));
 	}
 
 	while ((tok = strsep(&buf, "\n")) != NULL) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1f8c8d79d00b..62cc82d7b06e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2752,6 +2752,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 				 u32 closid)
 {
 	struct rdt_resource *r_cdp = NULL;
+	struct resctrl_staged_config *cfg;
 	struct rdt_domain *d_cdp = NULL;
 	struct rdt_resource *r = s->res;
 	u32 used_b = 0, unused_b = 0;
@@ -2761,8 +2762,9 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	int i;
 
 	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
-	d->have_new_ctrl = false;
-	d->new_ctrl = r->cache.shareable_bits;
+	cfg = &d->staged_config;
+	cfg->have_new_ctrl = false;
+	cfg->new_ctrl = r->cache.shareable_bits;
 	used_b = r->cache.shareable_bits;
 	ctrl = resctrl_to_arch_dom(d)->ctrl_val;
 	for (i = 0; i < closids_supported(); i++, ctrl++) {
@@ -2786,29 +2788,29 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 				peer_ctl = 0;
 			used_b |= *ctrl | peer_ctl;
 			if (mode == RDT_MODE_SHAREABLE)
-				d->new_ctrl |= *ctrl | peer_ctl;
+				cfg->new_ctrl |= *ctrl | peer_ctl;
 		}
 	}
 	if (d->plr && d->plr->cbm > 0)
 		used_b |= d->plr->cbm;
 	unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
 	unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
-	d->new_ctrl |= unused_b;
+	cfg->new_ctrl |= unused_b;
 	/*
 	 * Force the initial CBM to be valid, user can
 	 * modify the CBM based on system availability.
 	 */
-	d->new_ctrl = cbm_ensure_valid(d->new_ctrl, r);
+	cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
 	/*
 	 * Assign the u32 CBM to an unsigned long to ensure that
 	 * bitmap_weight() does not access out-of-bound memory.
 	 */
-	tmp_cbm = d->new_ctrl;
+	tmp_cbm = cfg->new_ctrl;
 	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
 		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
 		return -ENOSPC;
 	}
-	d->have_new_ctrl = true;
+	cfg->have_new_ctrl = true;
 
 	return 0;
 }
@@ -2840,11 +2842,13 @@ static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 /* Initialize MBA resource with default values. */
 static void rdtgroup_init_mba(struct rdt_resource *r)
 {
+	struct resctrl_staged_config *cfg;
 	struct rdt_domain *d;
 
 	list_for_each_entry(d, &r->domains, list) {
-		d->new_ctrl = is_mba_sc(r) ? MBA_MAX_MBPS : r->default_ctrl;
-		d->have_new_ctrl = true;
+		cfg = &d->staged_config;
+		cfg->new_ctrl = is_mba_sc(r) ? MBA_MAX_MBPS : r->default_ctrl;
+		cfg->have_new_ctrl = true;
 	}
 }
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index e482ce790ce2..ff7f7d7e1348 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -27,13 +27,21 @@ enum resctrl_conf_type {
 	CDP_DATA,
 };
 
+/**
+ * struct resctrl_staged_config - parsed configuration to be applied
+ * @new_ctrl:		new ctrl value to be loaded
+ * @have_new_ctrl:	whether the user provided new_ctrl is valid
+ */
+struct resctrl_staged_config {
+	u32			new_ctrl;
+	bool			have_new_ctrl;
+};
+
 /**
  * struct rdt_domain - group of CPUs sharing a resctrl resource
  * @list:		all instances of this resource
  * @id:			unique id for this instance
  * @cpu_mask:		which CPUs share this resource
- * @new_ctrl:		new ctrl value to be loaded
- * @have_new_ctrl:	did user provide new_ctrl for this domain
  * @rmid_busy_llc:	bitmap of which limbo RMIDs are above threshold
  * @mbm_total:		saved state for MBM total bandwidth
  * @mbm_local:		saved state for MBM local bandwidth
@@ -42,13 +50,12 @@ enum resctrl_conf_type {
  * @mbm_work_cpu:	worker CPU for MBM h/w counters
  * @cqm_work_cpu:	worker CPU for CQM h/w counters
  * @plr:		pseudo-locked region (if any) associated with domain
+ * @staged_config:	parsed configuration to be applied
  */
 struct rdt_domain {
 	struct list_head		list;
 	int				id;
 	struct cpumask			cpu_mask;
-	u32				new_ctrl;
-	bool				have_new_ctrl;
 	unsigned long			*rmid_busy_llc;
 	struct mbm_state		*mbm_total;
 	struct mbm_state		*mbm_local;
@@ -57,6 +64,7 @@ struct rdt_domain {
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
 	struct pseudo_lock_region	*plr;
+	struct resctrl_staged_config	staged_config;
 };
 
 /**
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 14/24] x86/resctrl: Allow different CODE/DATA configurations to be staged
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (12 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 13/24] x86/resctrl: Group staged configuration into a separate struct James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 15/24] x86/resctrl: Rename update_domains() resctrl_arch_update_domains() James Morse
                   ` (9 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Before the CDP resources can be merged, struct rdt_domain will
need an array of struct resctrl_staged_config, one per type of
configuration.

Use the type as an index to the array to ensure that a schema
configuration string can't specify the same domain twice. This
will allow two schema to apply configuration changes to one resource.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Add an empty line

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Renamed max enum value CDP_NUM_TYPES
 * Whitespace and parenthesis
 * Missing word in the commit message
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 20 ++++++++++++++------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  5 +++--
 include/linux/resctrl.h                   |  4 +++-
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 9ddfa7607234..f29848f98846 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -60,10 +60,11 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
 int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 	     struct rdt_domain *d)
 {
+	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	unsigned long bw_val;
-	struct resctrl_staged_config *cfg = &d->staged_config;
 
+	cfg = &d->staged_config[s->conf_type];
 	if (cfg->have_new_ctrl) {
 		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
 		return -EINVAL;
@@ -130,11 +131,12 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	      struct rdt_domain *d)
 {
-	struct resctrl_staged_config *cfg = &d->staged_config;
 	struct rdtgroup *rdtgrp = data->rdtgrp;
+	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	u32 cbm_val;
 
+	cfg = &d->staged_config[s->conf_type];
 	if (cfg->have_new_ctrl) {
 		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
 		return -EINVAL;
@@ -192,6 +194,7 @@ int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 static int parse_line(char *line, struct resctrl_schema *s,
 		      struct rdtgroup *rdtgrp)
 {
+	enum resctrl_conf_type t = s->conf_type;
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	struct rdt_parse_data data;
@@ -222,7 +225,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 			if (r->parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
-				cfg = &d->staged_config;
+				cfg = &d->staged_config[t];
 				/*
 				 * In pseudo-locking setup mode and just
 				 * parsed a valid CBM that should be
@@ -261,6 +264,7 @@ int update_domains(struct rdt_resource *r, int closid)
 	struct resctrl_staged_config *cfg;
 	struct rdt_hw_domain *hw_dom;
 	struct msr_param msr_param;
+	enum resctrl_conf_type t;
 	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
 	bool mba_sc;
@@ -276,9 +280,13 @@ int update_domains(struct rdt_resource *r, int closid)
 	mba_sc = is_mba_sc(r);
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
-		cfg = &hw_dom->d_resctrl.staged_config;
-		if (cfg->have_new_ctrl)
+		for (t = 0; t < CDP_NUM_TYPES; t++) {
+			cfg = &hw_dom->d_resctrl.staged_config[t];
+			if (!cfg->have_new_ctrl)
+				continue;
+
 			apply_config(hw_dom, cfg, closid, cpu_mask, mba_sc);
+		}
 	}
 
 	/*
@@ -350,7 +358,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		list_for_each_entry(dom, &s->res->domains, list)
-			memset(&dom->staged_config, 0, sizeof(dom->staged_config));
+			memset(dom->staged_config, 0, sizeof(dom->staged_config));
 	}
 
 	while ((tok = strsep(&buf, "\n")) != NULL) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 62cc82d7b06e..9f1354cb94e9 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2751,6 +2751,7 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
 static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 				 u32 closid)
 {
+	enum resctrl_conf_type t = s->conf_type;
 	struct rdt_resource *r_cdp = NULL;
 	struct resctrl_staged_config *cfg;
 	struct rdt_domain *d_cdp = NULL;
@@ -2762,7 +2763,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	int i;
 
 	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
-	cfg = &d->staged_config;
+	cfg = &d->staged_config[t];
 	cfg->have_new_ctrl = false;
 	cfg->new_ctrl = r->cache.shareable_bits;
 	used_b = r->cache.shareable_bits;
@@ -2846,7 +2847,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r)
 	struct rdt_domain *d;
 
 	list_for_each_entry(d, &r->domains, list) {
-		cfg = &d->staged_config;
+		cfg = &d->staged_config[CDP_NONE];
 		cfg->new_ctrl = is_mba_sc(r) ? MBA_MAX_MBPS : r->default_ctrl;
 		cfg->have_new_ctrl = true;
 	}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index ff7f7d7e1348..51ba372f96cd 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -27,6 +27,8 @@ enum resctrl_conf_type {
 	CDP_DATA,
 };
 
+#define CDP_NUM_TYPES	(CDP_DATA + 1)
+
 /**
  * struct resctrl_staged_config - parsed configuration to be applied
  * @new_ctrl:		new ctrl value to be loaded
@@ -64,7 +66,7 @@ struct rdt_domain {
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
 	struct pseudo_lock_region	*plr;
-	struct resctrl_staged_config	staged_config;
+	struct resctrl_staged_config	staged_config[CDP_NUM_TYPES];
 };
 
 /**
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 15/24] x86/resctrl: Rename update_domains() resctrl_arch_update_domains()
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (13 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 14/24] x86/resctrl: Allow different CODE/DATA configurations to be staged James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 16/24] x86/resctrl: Add a helper to read a closid's configuration James Morse
                   ` (8 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

update_domains() merges the staged configuration changes into the
arch codes configuration array. Rename to make it clear its part of the
arch code interface to resctrl.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * The closid is no longer staged as from resctrl its always going to be
   the same number even with CDP.
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 4 ++--
 arch/x86/kernel/cpu/resctrl/internal.h    | 1 -
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 2 +-
 include/linux/resctrl.h                   | 1 +
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index f29848f98846..8cde76df888a 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -259,7 +259,7 @@ static void apply_config(struct rdt_hw_domain *hw_dom,
 	}
 }
 
-int update_domains(struct rdt_resource *r, int closid)
+int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 {
 	struct resctrl_staged_config *cfg;
 	struct rdt_hw_domain *hw_dom;
@@ -380,7 +380,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		r = s->res;
-		ret = update_domains(r, rdtgrp->closid);
+		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
 		if (ret)
 			goto out;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index b8b45bae4b5b..d89c251d7b5a 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -530,7 +530,6 @@ void rdt_pseudo_lock_release(void);
 int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
 void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
-int update_domains(struct rdt_resource *r, int closid);
 int closids_supported(void);
 void closid_free(int closid);
 int alloc_rmid(void);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 9f1354cb94e9..4b6de76493d6 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2870,7 +2870,7 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
 				return ret;
 		}
 
-		ret = update_domains(r, rdtgrp->closid);
+		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
 		if (ret < 0) {
 			rdt_last_cmd_puts("Failed to initialize allocations\n");
 			return ret;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 51ba372f96cd..be5881171576 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -199,5 +199,6 @@ struct resctrl_schema {
 
 /* The number of closid supported by this resource regardless of CDP */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
+int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 16/24] x86/resctrl: Add a helper to read a closid's configuration
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (14 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 15/24] x86/resctrl: Rename update_domains() resctrl_arch_update_domains() James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 17/24] x86/resctrl: Pass configuration type to resctrl_arch_get_config() James Morse
                   ` (7 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Functions like show_doms() reach into the architecture's private
structure to retrieve the configuration from the struct rdt_hw_resource.

The hardware configuration may look completely different to the
values resctrl gets from user-space. The staged configuration
and resctrl_arch_update_domains() allow the architecture to
convert or translate these values.

Resctrl shouldn't read or write the ctrl_val[] values directly.
Add a helper to read the current configuration. This will allow another
architecture to scale the bitmaps if necessary, and possibly use controls
that don't take the user-space control format at all.
Of the remaining functions that access ctrl_val[] directly,
apply_config() is part of the architecture specific code, and is called
via resctrl_arch_update_domains(). reset_all_ctrls() will be an
architecture specific helper.
update_mba_bw() manipulates both ctrl_val[], mbps_val[] and the
hardware. The mbps_val[] that matches the mba_sc state of the
resource is changed, but the other is left unchanged. Abstracting
this is the subject of later patches that affect set_mba_sc() too.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Fixed a spelling mistake.

Changes since v2:
 * Shuffled commit message,
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 16 ++++++---
 arch/x86/kernel/cpu/resctrl/monitor.c     |  6 +++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 43 ++++++++++-------------
 include/linux/resctrl.h                   |  2 ++
 4 files changed, 37 insertions(+), 30 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 8cde76df888a..4da08ba0deda 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -401,22 +401,30 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
+void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
+			     u32 closid, u32 *value)
+{
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
+
+	if (!is_mba_sc(r))
+		*value = hw_dom->ctrl_val[closid];
+	else
+		*value = hw_dom->mbps_val[closid];
+}
+
 static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
 {
 	struct rdt_resource *r = schema->res;
-	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *dom;
 	bool sep = false;
 	u32 ctrl_val;
 
 	seq_printf(s, "%*s:", max_name_width, schema->name);
 	list_for_each_entry(dom, &r->domains, list) {
-		hw_dom = resctrl_to_arch_dom(dom);
 		if (sep)
 			seq_puts(s, ";");
 
-		ctrl_val = (!is_mba_sc(r) ? hw_dom->ctrl_val[closid] :
-			    hw_dom->mbps_val[closid]);
+		resctrl_arch_get_config(r, dom, closid, &ctrl_val);
 		seq_printf(s, r->format_str, dom->id, max_data_width,
 			   ctrl_val);
 		sep = true;
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 26a094870c16..e45e7150eb81 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -442,8 +442,12 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	hw_dom_mba = resctrl_to_arch_dom(dom_mba);
 
 	cur_bw = pmbm_data->prev_bw;
-	user_bw = hw_dom_mba->mbps_val[closid];
+	resctrl_arch_get_config(r_mba, dom_mba, closid, &user_bw);
 	delta_bw = pmbm_data->delta_bw;
+	/*
+	 * resctrl_arch_get_config() chooses the mbps/ctrl value to return
+	 * based on is_mba_sc(). For now, reach into the hw_dom.
+	 */
 	cur_msr_val = hw_dom_mba->ctrl_val[closid];
 
 	/*
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 4b6de76493d6..6b2be5633536 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -910,27 +910,27 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 	int i, hwb, swb, excl, psl;
 	enum rdtgrp_mode mode;
 	bool sep = false;
-	u32 *ctrl;
+	u32 ctrl_val;
 
 	mutex_lock(&rdtgroup_mutex);
 	hw_shareable = r->cache.shareable_bits;
 	list_for_each_entry(dom, &r->domains, list) {
 		if (sep)
 			seq_putc(seq, ';');
-		ctrl = resctrl_to_arch_dom(dom)->ctrl_val;
 		sw_shareable = 0;
 		exclusive = 0;
 		seq_printf(seq, "%d=", dom->id);
-		for (i = 0; i < closids_supported(); i++, ctrl++) {
+		for (i = 0; i < closids_supported(); i++) {
 			if (!closid_allocated(i))
 				continue;
+			resctrl_arch_get_config(r, dom, i, &ctrl_val);
 			mode = rdtgroup_mode_by_closid(i);
 			switch (mode) {
 			case RDT_MODE_SHAREABLE:
-				sw_shareable |= *ctrl;
+				sw_shareable |= ctrl_val;
 				break;
 			case RDT_MODE_EXCLUSIVE:
-				exclusive |= *ctrl;
+				exclusive |= ctrl_val;
 				break;
 			case RDT_MODE_PSEUDO_LOCKSETUP:
 			/*
@@ -1188,7 +1188,6 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 {
 	enum rdtgrp_mode mode;
 	unsigned long ctrl_b;
-	u32 *ctrl;
 	int i;
 
 	/* Check for any overlap with regions used by hardware directly */
@@ -1199,9 +1198,8 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 	}
 
 	/* Check for overlap with other resource groups */
-	ctrl = resctrl_to_arch_dom(d)->ctrl_val;
-	for (i = 0; i < closids_supported(); i++, ctrl++) {
-		ctrl_b = *ctrl;
+	for (i = 0; i < closids_supported(); i++) {
+		resctrl_arch_get_config(r, d, i, (u32 *)&ctrl_b);
 		mode = rdtgroup_mode_by_closid(i);
 		if (closid_allocated(i) && i != closid &&
 		    mode != RDT_MODE_PSEUDO_LOCKSETUP) {
@@ -1269,12 +1267,12 @@ bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
  */
 static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 {
-	struct rdt_hw_domain *hw_dom;
 	int closid = rdtgrp->closid;
 	struct resctrl_schema *s;
 	struct rdt_resource *r;
 	bool has_cache = false;
 	struct rdt_domain *d;
+	u32 ctrl;
 
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		r = s->res;
@@ -1282,10 +1280,8 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 			continue;
 		has_cache = true;
 		list_for_each_entry(d, &r->domains, list) {
-			hw_dom = resctrl_to_arch_dom(d);
-			if (rdtgroup_cbm_overlaps(s, d,
-						  hw_dom->ctrl_val[closid],
-						  rdtgrp->closid, false)) {
+			resctrl_arch_get_config(r, d, closid, &ctrl);
+			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
 				rdt_last_cmd_puts("Schemata overlaps\n");
 				return false;
 			}
@@ -1417,7 +1413,6 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 			      struct seq_file *s, void *v)
 {
 	struct resctrl_schema *schema;
-	struct rdt_hw_domain *hw_dom;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
 	struct rdt_domain *d;
@@ -1453,15 +1448,13 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 		sep = false;
 		seq_printf(s, "%*s:", max_name_width, schema->name);
 		list_for_each_entry(d, &r->domains, list) {
-			hw_dom = resctrl_to_arch_dom(d);
 			if (sep)
 				seq_putc(s, ';');
 			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 				size = 0;
 			} else {
-				ctrl = (!is_mba_sc(r) ?
-						hw_dom->ctrl_val[rdtgrp->closid] :
-						hw_dom->mbps_val[rdtgrp->closid]);
+				resctrl_arch_get_config(r, d, rdtgrp->closid,
+							&ctrl);
 				if (r->rid == RDT_RESOURCE_MBA)
 					size = ctrl;
 				else
@@ -2759,7 +2752,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	u32 used_b = 0, unused_b = 0;
 	unsigned long tmp_cbm;
 	enum rdtgrp_mode mode;
-	u32 peer_ctl, *ctrl;
+	u32 peer_ctl, ctrl_val;
 	int i;
 
 	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
@@ -2767,8 +2760,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	cfg->have_new_ctrl = false;
 	cfg->new_ctrl = r->cache.shareable_bits;
 	used_b = r->cache.shareable_bits;
-	ctrl = resctrl_to_arch_dom(d)->ctrl_val;
-	for (i = 0; i < closids_supported(); i++, ctrl++) {
+	for (i = 0; i < closids_supported(); i++) {
 		if (closid_allocated(i) && i != closid) {
 			mode = rdtgroup_mode_by_closid(i);
 			if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
@@ -2784,12 +2776,13 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 			 * with an exclusive group.
 			 */
 			if (d_cdp)
-				peer_ctl = resctrl_to_arch_dom(d_cdp)->ctrl_val[i];
+				resctrl_arch_get_config(r_cdp, d_cdp, i, &peer_ctl);
 			else
 				peer_ctl = 0;
-			used_b |= *ctrl | peer_ctl;
+			resctrl_arch_get_config(r, d, i, &ctrl_val);
+			used_b |= ctrl_val | peer_ctl;
 			if (mode == RDT_MODE_SHAREABLE)
-				cfg->new_ctrl |= *ctrl | peer_ctl;
+				cfg->new_ctrl |= ctrl_val | peer_ctl;
 		}
 	}
 	if (d->plr && d->plr->cbm > 0)
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index be5881171576..3a2309403094 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -200,5 +200,7 @@ struct resctrl_schema {
 /* The number of closid supported by this resource regardless of CDP */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
+void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
+			     u32 closid, u32 *value);
 
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 17/24] x86/resctrl: Pass configuration type to resctrl_arch_get_config()
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (15 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 16/24] x86/resctrl: Add a helper to read a closid's configuration James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 18/24] x86/resctrl: Make ctrlval arrays the same size James Morse
                   ` (6 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

The ctrl_val[] array for a struct rdt_hw_resource only holds
configurations of one type. The type is implicit.

Once the CDP resources are merged, the ctrl_val[] array will hold
all the configurations for the hardware resource. When a particular
type of configuration is needed, it must be specified explicitly.

Pass the expected type from the schema into resctrl_arch_get_config().
Nothing uses this yet, but once a single ctrl_val[] array is used
for the three struct rdt_hw_resources that share hardware, the type
will be used to return the correct configuration value from the
shared array.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * Shuffled commit message,
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  5 ++--
 arch/x86/kernel/cpu/resctrl/monitor.c     |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 35 +++++++++++++++--------
 include/linux/resctrl.h                   |  3 +-
 4 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 4da08ba0deda..9ead0c0bf6ee 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -402,7 +402,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 }
 
 void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
-			     u32 closid, u32 *value)
+			     u32 closid, enum resctrl_conf_type type, u32 *value)
 {
 	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 
@@ -424,7 +424,8 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 		if (sep)
 			seq_puts(s, ";");
 
-		resctrl_arch_get_config(r, dom, closid, &ctrl_val);
+		resctrl_arch_get_config(r, dom, closid, schema->conf_type,
+					&ctrl_val);
 		seq_printf(s, r->format_str, dom->id, max_data_width,
 			   ctrl_val);
 		sep = true;
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index e45e7150eb81..eb227298487f 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -442,7 +442,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	hw_dom_mba = resctrl_to_arch_dom(dom_mba);
 
 	cur_bw = pmbm_data->prev_bw;
-	resctrl_arch_get_config(r_mba, dom_mba, closid, &user_bw);
+	resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE, &user_bw);
 	delta_bw = pmbm_data->delta_bw;
 	/*
 	 * resctrl_arch_get_config() chooses the mbps/ctrl value to return
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 6b2be5633536..61037b239327 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -923,7 +923,8 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 		for (i = 0; i < closids_supported(); i++) {
 			if (!closid_allocated(i))
 				continue;
-			resctrl_arch_get_config(r, dom, i, &ctrl_val);
+			resctrl_arch_get_config(r, dom, i, s->conf_type,
+						&ctrl_val);
 			mode = rdtgroup_mode_by_closid(i);
 			switch (mode) {
 			case RDT_MODE_SHAREABLE:
@@ -1099,6 +1100,7 @@ static int rdtgroup_mode_show(struct kernfs_open_file *of,
  *         Used to return the result.
  * @d_cdp: RDT domain that shares hardware with @d (RDT domain peer)
  *         Used to return the result.
+ * @peer_type: The CDP configuration type of the peer resource.
  *
  * RDT resources are managed independently and by extension the RDT domains
  * (RDT resource instances) are managed independently also. The Code and
@@ -1116,7 +1118,8 @@ static int rdtgroup_mode_show(struct kernfs_open_file *of,
  */
 static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
 			    struct rdt_resource **r_cdp,
-			    struct rdt_domain **d_cdp)
+			    struct rdt_domain **d_cdp,
+			    enum resctrl_conf_type *peer_type)
 {
 	struct rdt_resource *_r_cdp = NULL;
 	struct rdt_domain *_d_cdp = NULL;
@@ -1125,15 +1128,19 @@ static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
 	switch (r->rid) {
 	case RDT_RESOURCE_L3DATA:
 		_r_cdp = &rdt_resources_all[RDT_RESOURCE_L3CODE].r_resctrl;
+		*peer_type = CDP_CODE;
 		break;
 	case RDT_RESOURCE_L3CODE:
 		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl;
+		*peer_type = CDP_DATA;
 		break;
 	case RDT_RESOURCE_L2DATA:
 		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2CODE].r_resctrl;
+		*peer_type = CDP_CODE;
 		break;
 	case RDT_RESOURCE_L2CODE:
 		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl;
+		*peer_type = CDP_DATA;
 		break;
 	default:
 		ret = -ENOENT;
@@ -1184,7 +1191,8 @@ static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
  * Return: false if CBM does not overlap, true if it does.
  */
 static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
-				    unsigned long cbm, int closid, bool exclusive)
+				    unsigned long cbm, int closid,
+				    enum resctrl_conf_type type, bool exclusive)
 {
 	enum rdtgrp_mode mode;
 	unsigned long ctrl_b;
@@ -1199,7 +1207,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 
 	/* Check for overlap with other resource groups */
 	for (i = 0; i < closids_supported(); i++) {
-		resctrl_arch_get_config(r, d, i, (u32 *)&ctrl_b);
+		resctrl_arch_get_config(r, d, i, type, (u32 *)&ctrl_b);
 		mode = rdtgroup_mode_by_closid(i);
 		if (closid_allocated(i) && i != closid &&
 		    mode != RDT_MODE_PSEUDO_LOCKSETUP) {
@@ -1240,17 +1248,19 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
 			   unsigned long cbm, int closid, bool exclusive)
 {
+	enum resctrl_conf_type peer_type;
 	struct rdt_resource *r = s->res;
 	struct rdt_resource *r_cdp;
 	struct rdt_domain *d_cdp;
 
-	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, exclusive))
+	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
+				    exclusive))
 		return true;
 
-	if (rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp) < 0)
+	if (rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp, &peer_type) < 0)
 		return false;
 
-	return  __rdtgroup_cbm_overlaps(r_cdp, d_cdp, cbm, closid, exclusive);
+	return  __rdtgroup_cbm_overlaps(r_cdp, d_cdp, cbm, closid, peer_type, exclusive);
 }
 
 /**
@@ -1280,7 +1290,7 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 			continue;
 		has_cache = true;
 		list_for_each_entry(d, &r->domains, list) {
-			resctrl_arch_get_config(r, d, closid, &ctrl);
+			resctrl_arch_get_config(r, d, closid, s->conf_type, &ctrl);
 			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
 				rdt_last_cmd_puts("Schemata overlaps\n");
 				return false;
@@ -1454,7 +1464,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 				size = 0;
 			} else {
 				resctrl_arch_get_config(r, d, rdtgrp->closid,
-							&ctrl);
+							schema->conf_type, &ctrl);
 				if (r->rid == RDT_RESOURCE_MBA)
 					size = ctrl;
 				else
@@ -2747,6 +2757,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	enum resctrl_conf_type t = s->conf_type;
 	struct rdt_resource *r_cdp = NULL;
 	struct resctrl_staged_config *cfg;
+	enum resctrl_conf_type peer_type;
 	struct rdt_domain *d_cdp = NULL;
 	struct rdt_resource *r = s->res;
 	u32 used_b = 0, unused_b = 0;
@@ -2755,7 +2766,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	u32 peer_ctl, ctrl_val;
 	int i;
 
-	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
+	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp, &peer_type);
 	cfg = &d->staged_config[t];
 	cfg->have_new_ctrl = false;
 	cfg->new_ctrl = r->cache.shareable_bits;
@@ -2776,10 +2787,10 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 			 * with an exclusive group.
 			 */
 			if (d_cdp)
-				resctrl_arch_get_config(r_cdp, d_cdp, i, &peer_ctl);
+				resctrl_arch_get_config(r_cdp, d_cdp, i, peer_type, &peer_ctl);
 			else
 				peer_ctl = 0;
-			resctrl_arch_get_config(r, d, i, &ctrl_val);
+			resctrl_arch_get_config(r, d, i, s->conf_type, &ctrl_val);
 			used_b |= ctrl_val | peer_ctl;
 			if (mode == RDT_MODE_SHAREABLE)
 				cfg->new_ctrl |= ctrl_val | peer_ctl;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 3a2309403094..69d7387b7f22 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -201,6 +201,7 @@ struct resctrl_schema {
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
-			     u32 closid, u32 *value);
+			     u32 closid, enum resctrl_conf_type type,
+			     u32 *value);
 
 #endif /* _RESCTRL_H */
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 18/24] x86/resctrl: Make ctrlval arrays the same size
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (16 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 17/24] x86/resctrl: Pass configuration type to resctrl_arch_get_config() James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 19/24] x86/resctrl: Apply offset correction when config is staged James Morse
                   ` (5 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

The CODE and DATA resources report a num_closid that is half the
actual size supported by the hardware. This behaviour is visible
to user-space when CDP is enabled.
The CODE and DATA resources have their own ctrlval arrays which are half
the size of the underlying hardware because num_closid was already
adjusted. One holds the odd configurations values, the other even.

Before the CDP resources can be merged, the 'half the closids'
behaviour needs to be implemented by schemata_list_create(), but
this causes the ctrl_val[] array to be full sized.

Remove the logic from the architecture specific rdt_get_cdp_config()
setup, and add it to schemata_list_create(). Functions that
walk all the configurations, such as domain_setup_ctrlval() and
reset_all_ctrls(), take num_closid directly from struct rdt_hw_resource
also have to halve num_closid as only the lower half of each array is
in use. domain_setup_ctrlval() and reset_all_ctrls() both copy
struct rdt_hw_resource's num_closid to a struct msr_param. Correct
the value here. This is temporary as a subsequent patch will merge
all three ctrl_val[] arrays such that when CDP is in use, the
CODA/DATA layout in the array matches the hardware. reset_all_ctrls()'s
loop over the whole of ctrl_val[] is not touched as this is harmless,
and will be required as it is once the resources are merged.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v4:
 * Added missing words to the commit message, fixed a typo.

No changes since v3.

Changes since v2:
 * Shuffled commit message,
---
 arch/x86/kernel/cpu/resctrl/core.c     | 10 +++++++++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  9 +++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 755118a9ef38..9f8be5ee5e8a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -363,7 +363,7 @@ static void rdt_get_cdp_config(int level, int type)
 	struct rdt_resource *r = &rdt_resources_all[type].r_resctrl;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
-	hw_res->num_closid = hw_res_l->num_closid / 2;
+	hw_res->num_closid = hw_res_l->num_closid;
 	r->cache.cbm_len = r_l->cache.cbm_len;
 	r->default_ctrl = r_l->default_ctrl;
 	r->cache.shareable_bits = r_l->cache.shareable_bits;
@@ -549,6 +549,14 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 
 	m.low = 0;
 	m.high = hw_res->num_closid;
+
+	/*
+	 * temporary: the array is full-size, but cat_wrmsr() still re-maps
+	 * the index.
+	 */
+	if (hw_res->conf_type != CDP_NONE)
+		m.high /= 2;
+
 	hw_res->msr_update(d, &m, r);
 	return 0;
 }
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 61037b239327..299af12c9fe4 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2154,6 +2154,8 @@ static int schemata_list_create(void)
 		s->res = r;
 		s->conf_type = resctrl_to_arch_res(r)->conf_type;
 		s->num_closid = resctrl_arch_get_num_closid(r);
+		if (resctrl_arch_get_cdp_enabled(r->rid))
+			s->num_closid /= 2;
 
 		ret = snprintf(s->name, sizeof(s->name), r->name);
 		if (ret >= sizeof(s->name)) {
@@ -2376,6 +2378,13 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	msr_param.low = 0;
 	msr_param.high = hw_res->num_closid;
 
+	/*
+	 * temporary: the array is full-sized, but cat_wrmsr() still re-maps
+	 * the index.
+	 */
+	if (hw_res->cdp_enabled)
+		msr_param.high /= 2;
+
 	/*
 	 * Disable resource control for this resource by setting all
 	 * CBMs in all domains to the maximum mask value. Pick one CPU
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 19/24] x86/resctrl: Apply offset correction when config is staged
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (17 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 18/24] x86/resctrl: Make ctrlval arrays the same size James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 20/24] x86/resctrl: Calculate the index from the configuration type James Morse
                   ` (4 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

When resctrl comes to copy the CAT MSR values from the ctrl_val[] array
into hardware, it applies an offset adjustment based on the type of the
resource. CODE and DATA resources have their closid mapped into an
odd/even range. This mapping is based on a property of the resource.

This happens once the new control value has been written to the ctrl_val[]
array. Once the CDP resources are merged, there will only be a single
property that needs to cover both odd/even mappings to the single
ctrl_val[] array. The offset adjustment must be applied before the new
value is written to the array.

Move the logic from cat_wrmsr() to resctrl_arch_update_domains().
The value provided to apply_config() is now an index in the array,
not the closid. The parameters provided via struct msr_param are now
indexes too. As resctrl's use of closid is a u32, struct msr_param's
type is changed to match.
With this, the CODE and DATA resources only use the odd or even
indexes in the array. This allows the temporary num_closid/2 fixes in
domain_setup_ctrlval() and reset_all_ctrls() to be removed.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Fixed a fat-fingered 'unsinged u32' - oops!
 * Fixed a spelling mistake.

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Removing the patch that moved the closid to the staged config means the
   min/max and return from apply_config() appears here.
---
 arch/x86/kernel/cpu/resctrl/core.c        | 15 +----------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 32 +++++++++++++++++------
 arch/x86/kernel/cpu/resctrl/internal.h    |  4 +--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  7 -----
 4 files changed, 27 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 9f8be5ee5e8a..990e41661b4a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -195,11 +195,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 };
 
-static unsigned int cbm_idx(struct rdt_resource *r, unsigned int closid)
-{
-	return closid * r->cache.cbm_idx_mult + r->cache.cbm_idx_offset;
-}
-
 /*
  * cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs
  * as they do not have CPUID enumeration support for Cache allocation.
@@ -438,7 +433,7 @@ cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(hw_res->msr_base + cbm_idx(r, i), hw_dom->ctrl_val[i]);
+		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
 }
 
 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
@@ -549,14 +544,6 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 
 	m.low = 0;
 	m.high = hw_res->num_closid;
-
-	/*
-	 * temporary: the array is full-size, but cat_wrmsr() still re-maps
-	 * the index.
-	 */
-	if (hw_res->conf_type != CDP_NONE)
-		m.high /= 2;
-
 	hw_res->msr_update(d, &m, r);
 	return 0;
 }
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 9ead0c0bf6ee..fdb0e11a78dc 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -246,17 +246,29 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	return -EINVAL;
 }
 
-static void apply_config(struct rdt_hw_domain *hw_dom,
-			 struct resctrl_staged_config *cfg, int closid,
+static u32 cbm_idx(struct rdt_resource *r, unsigned int closid)
+{
+	if (r->rid == RDT_RESOURCE_MBA)
+		return closid;
+
+	return closid * r->cache.cbm_idx_mult + r->cache.cbm_idx_offset;
+}
+
+static bool apply_config(struct rdt_hw_domain *hw_dom,
+			 struct resctrl_staged_config *cfg, u32 idx,
 			 cpumask_var_t cpu_mask, bool mba_sc)
 {
 	struct rdt_domain *dom = &hw_dom->d_resctrl;
 	u32 *dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
 
-	if (cfg->new_ctrl != dc[closid]) {
+	if (cfg->new_ctrl != dc[idx]) {
 		cpumask_set_cpu(cpumask_any(&dom->cpu_mask), cpu_mask);
-		dc[closid] = cfg->new_ctrl;
+		dc[idx] = cfg->new_ctrl;
+
+		return true;
 	}
+
+	return false;
 }
 
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
@@ -269,11 +281,12 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	struct rdt_domain *d;
 	bool mba_sc;
 	int cpu;
+	u32 idx;
 
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
 		return -ENOMEM;
 
-	msr_param.low = closid;
+	msr_param.low = cbm_idx(r, closid);
 	msr_param.high = msr_param.low + 1;
 	msr_param.res = r;
 
@@ -285,7 +298,9 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			if (!cfg->have_new_ctrl)
 				continue;
 
-			apply_config(hw_dom, cfg, closid, cpu_mask, mba_sc);
+			idx = cbm_idx(r, closid);
+			if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc))
+				continue;
 		}
 	}
 
@@ -405,11 +420,12 @@ void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 			     u32 closid, enum resctrl_conf_type type, u32 *value)
 {
 	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
+	u32 idx = cbm_idx(r, closid);
 
 	if (!is_mba_sc(r))
-		*value = hw_dom->ctrl_val[closid];
+		*value = hw_dom->ctrl_val[idx];
 	else
-		*value = hw_dom->mbps_val[closid];
+		*value = hw_dom->mbps_val[idx];
 }
 
 static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index d89c251d7b5a..0260b1a63b86 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -332,8 +332,8 @@ static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
  */
 struct msr_param {
 	struct rdt_resource	*res;
-	int			low;
-	int			high;
+	u32			low;
+	u32			high;
 };
 
 static inline bool is_llc_occupancy_enabled(void)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 299af12c9fe4..1f72517057e8 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2378,13 +2378,6 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	msr_param.low = 0;
 	msr_param.high = hw_res->num_closid;
 
-	/*
-	 * temporary: the array is full-sized, but cat_wrmsr() still re-maps
-	 * the index.
-	 */
-	if (hw_res->cdp_enabled)
-		msr_param.high /= 2;
-
 	/*
 	 * Disable resource control for this resource by setting all
 	 * CBMs in all domains to the maximum mask value. Pick one CPU
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 20/24] x86/resctrl: Calculate the index from the configuration type
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (18 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 19/24] x86/resctrl: Apply offset correction when config is staged James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 21/24] x86/resctrl: Merge the ctrl_val arrays James Morse
                   ` (3 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

resctrl uses cbm_idx() to map a closid to an index in the
configuration array. This is based on a multiplier and offset
that are held in the resource.

To merge the resources, the resctrl arch code needs to calculate
the index from something else, as there will only be one resource.

Decide based on the staged configuration type. This makes the
static mult and offset parameters redundant.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * Shuffled commit message,
---
 arch/x86/kernel/cpu/resctrl/core.c        | 12 -----------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 25 ++++++++++++++---------
 include/linux/resctrl.h                   |  6 ------
 3 files changed, 15 insertions(+), 28 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 990e41661b4a..c6b953fe7fdf 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -69,8 +69,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.cache_level		= 3,
 			.cache = {
 				.min_cbm_bits	= 1,
-				.cbm_idx_mult	= 1,
-				.cbm_idx_offset	= 0,
 			},
 			.domains		= domain_init(RDT_RESOURCE_L3),
 			.parse_ctrlval		= parse_cbm,
@@ -89,8 +87,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.cache_level		= 3,
 			.cache = {
 				.min_cbm_bits	= 1,
-				.cbm_idx_mult	= 2,
-				.cbm_idx_offset	= 0,
 			},
 			.domains		= domain_init(RDT_RESOURCE_L3DATA),
 			.parse_ctrlval		= parse_cbm,
@@ -109,8 +105,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.cache_level		= 3,
 			.cache = {
 				.min_cbm_bits	= 1,
-				.cbm_idx_mult	= 2,
-				.cbm_idx_offset	= 1,
 			},
 			.domains		= domain_init(RDT_RESOURCE_L3CODE),
 			.parse_ctrlval		= parse_cbm,
@@ -129,8 +123,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.cache_level		= 2,
 			.cache = {
 				.min_cbm_bits	= 1,
-				.cbm_idx_mult	= 1,
-				.cbm_idx_offset	= 0,
 			},
 			.domains		= domain_init(RDT_RESOURCE_L2),
 			.parse_ctrlval		= parse_cbm,
@@ -149,8 +141,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.cache_level		= 2,
 			.cache = {
 				.min_cbm_bits	= 1,
-				.cbm_idx_mult	= 2,
-				.cbm_idx_offset	= 0,
 			},
 			.domains		= domain_init(RDT_RESOURCE_L2DATA),
 			.parse_ctrlval		= parse_cbm,
@@ -169,8 +159,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.cache_level		= 2,
 			.cache = {
 				.min_cbm_bits	= 1,
-				.cbm_idx_mult	= 2,
-				.cbm_idx_offset	= 1,
 			},
 			.domains		= domain_init(RDT_RESOURCE_L2CODE),
 			.parse_ctrlval		= parse_cbm,
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index fdb0e11a78dc..04d54d942527 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -246,12 +246,17 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	return -EINVAL;
 }
 
-static u32 cbm_idx(struct rdt_resource *r, unsigned int closid)
+static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
 {
-	if (r->rid == RDT_RESOURCE_MBA)
+	switch (type) {
+	default:
+	case CDP_NONE:
 		return closid;
-
-	return closid * r->cache.cbm_idx_mult + r->cache.cbm_idx_offset;
+	case CDP_CODE:
+		return (closid * 2) + 1;
+	case CDP_DATA:
+		return (closid * 2);
+	}
 }
 
 static bool apply_config(struct rdt_hw_domain *hw_dom,
@@ -286,10 +291,6 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
 		return -ENOMEM;
 
-	msr_param.low = cbm_idx(r, closid);
-	msr_param.high = msr_param.low + 1;
-	msr_param.res = r;
-
 	mba_sc = is_mba_sc(r);
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
@@ -298,9 +299,13 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			if (!cfg->have_new_ctrl)
 				continue;
 
-			idx = cbm_idx(r, closid);
+			idx = get_config_index(closid, t);
 			if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc))
 				continue;
+
+			msr_param.low = idx;
+			msr_param.high = msr_param.low + 1;
+			msr_param.res = r;
 		}
 	}
 
@@ -420,7 +425,7 @@ void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 			     u32 closid, enum resctrl_conf_type type, u32 *value)
 {
 	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	u32 idx = cbm_idx(r, closid);
+	u32 idx = get_config_index(closid, type);
 
 	if (!is_mba_sc(r))
 		*value = hw_dom->ctrl_val[idx];
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 69d7387b7f22..18dd764af0dd 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -73,10 +73,6 @@ struct rdt_domain {
  * struct resctrl_cache - Cache allocation related data
  * @cbm_len:		Length of the cache bit mask
  * @min_cbm_bits:	Minimum number of consecutive bits to be set
- * @cbm_idx_mult:	Multiplier of CBM index
- * @cbm_idx_offset:	Offset of CBM index. CBM index is computed by:
- *			closid * cbm_idx_multi + cbm_idx_offset
- *			in a cache bit mask
  * @shareable_bits:	Bitmask of shareable resource with other
  *			executing entities
  * @arch_has_sparse_bitmaps:	True if a bitmap like f00f is valid.
@@ -87,8 +83,6 @@ struct rdt_domain {
 struct resctrl_cache {
 	unsigned int	cbm_len;
 	unsigned int	min_cbm_bits;
-	unsigned int	cbm_idx_mult;	// TODO remove this
-	unsigned int	cbm_idx_offset; // TODO remove this
 	unsigned int	shareable_bits;
 	bool		arch_has_sparse_bitmaps;
 	bool		arch_has_empty_bitmaps;
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 21/24] x86/resctrl: Merge the ctrl_val arrays
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (19 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 20/24] x86/resctrl: Calculate the index from the configuration type James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 22/24] x86/resctrl: Remove rdt_cdp_peer_get() James Morse
                   ` (2 subsequent siblings)
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Each struct rdt_hw_resource has its own ctrl_val[] array. When CDP is
enabled, two resources are in use, each with its own ctrl_val[] array
that holds half of the configuration used by hardware. One uses the
odd slots, the other the even. rdt_cdp_peer_get() is the helper to
find the alternate resource, its domain, and corresponding entry
in the other ctrl_val[] array.

Once the CDP resources are merged there will be one struct rdt_hw_resource
and one ctrl_val[] array for each hardware resource. This will
include changes to rdt_cdp_peer_get(), making it hard to bisect any
issue.

Merge the ctrl_val[] arrays for three CODE/DATA/NONE resources first.
Doing this before merging the resources temporarily complicates
allocating and freeing the ctrl_val arrays. Add a helper to allocate
the ctrl_val array, that returns the value on the L2 or L3 resource
if it already exists. This gets removed once the resources are merged,
and there really is only one ctrl_val[] array.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Removed some parenthesis that disappear in a later patch.

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Added underscores to ctrlval when its not in a function name
 * Removed temporary free_ctrlval_arrays() function.
 * Reduced churn in domain_setup_ctrlval().
---
 arch/x86/kernel/cpu/resctrl/core.c | 65 ++++++++++++++++++++++++++++--
 1 file changed, 61 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index c6b953fe7fdf..4c0b1265ffd4 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -509,6 +509,57 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
 	}
 }
 
+static u32 *alloc_ctrlval_array(struct rdt_resource *r, struct rdt_domain *d,
+				bool mba_sc)
+{
+	/* these are for the underlying hardware, they may not match r/d */
+	struct rdt_domain *underlying_domain;
+	struct rdt_hw_resource *hw_res;
+	struct rdt_hw_domain *hw_dom;
+	bool remapped;
+
+	switch (r->rid) {
+	case RDT_RESOURCE_L3DATA:
+	case RDT_RESOURCE_L3CODE:
+		hw_res = &rdt_resources_all[RDT_RESOURCE_L3];
+		remapped = true;
+		break;
+	case RDT_RESOURCE_L2DATA:
+	case RDT_RESOURCE_L2CODE:
+		hw_res = &rdt_resources_all[RDT_RESOURCE_L2];
+		remapped = true;
+		break;
+	default:
+		hw_res = resctrl_to_arch_res(r);
+		remapped = false;
+	}
+
+	/*
+	 * If we changed the resource, we need to search for the underlying
+	 * domain. Doing this for all resources would make it tricky to add the
+	 * first resource, as domains aren't added to a resource list until
+	 * after the ctrlval arrays have been allocated.
+	 */
+	if (remapped)
+		underlying_domain = rdt_find_domain(&hw_res->r_resctrl, d->id,
+						    NULL);
+	else
+		underlying_domain = d;
+	hw_dom = resctrl_to_arch_dom(underlying_domain);
+
+	if (mba_sc) {
+		if (hw_dom->mbps_val)
+			return hw_dom->mbps_val;
+		return kmalloc_array(hw_res->num_closid,
+				     sizeof(*hw_dom->mbps_val), GFP_KERNEL);
+	} else {
+		if (hw_dom->ctrl_val)
+			return hw_dom->ctrl_val;
+		return kmalloc_array(hw_res->num_closid,
+				     sizeof(*hw_dom->ctrl_val), GFP_KERNEL);
+	}
+}
+
 static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
@@ -516,11 +567,11 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 	struct msr_param m;
 	u32 *dc, *dm;
 
-	dc = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->ctrl_val), GFP_KERNEL);
+	dc = alloc_ctrlval_array(r, d, false);
 	if (!dc)
 		return -ENOMEM;
 
-	dm = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->mbps_val), GFP_KERNEL);
+	dm = alloc_ctrlval_array(r, d, true);
 	if (!dm) {
 		kfree(dc);
 		return -ENOMEM;
@@ -679,8 +730,14 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 		if (d->plr)
 			d->plr->d = NULL;
 
-		kfree(hw_dom->ctrl_val);
-		kfree(hw_dom->mbps_val);
+		/* temporary: these four don't have a unique ctrlval array */
+		if (r->rid != RDT_RESOURCE_L3CODE &&
+		    r->rid != RDT_RESOURCE_L3DATA &&
+		    r->rid != RDT_RESOURCE_L2CODE &&
+		    r->rid != RDT_RESOURCE_L2DATA) {
+			kfree(hw_dom->ctrl_val);
+			kfree(hw_dom->mbps_val);
+		}
 		bitmap_free(d->rmid_busy_llc);
 		kfree(d->mbm_total);
 		kfree(d->mbm_local);
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 22/24] x86/resctrl: Remove rdt_cdp_peer_get()
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (20 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 21/24] x86/resctrl: Merge the ctrl_val arrays James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 23/24] x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range James Morse
  2021-07-15 17:30 ` [PATCH v6 24/24] x86/resctrl: Merge the CDP resources James Morse
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

When CDP is enabled, rdt_cdp_peer_get() finds the alternative
CODE/DATA resource and returns the alternative domain. This is used
to determine if bitmaps overlap when there are aliased entries
in the two struct rdt_hw_resources.

Now that the ctrl_val[] used by the CODE/DATA resources is the same,
the search for an alternate resource/domain is not needed.

Replace rdt_cdp_peer_get() with resctrl_peer_type(), which returns
the alternative type. This can be passed to resctrl_arch_get_config()
with the same resource and domain.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * Shuffled commit message,

Changes since v1:
 * Expanded commit mesasge.
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 99 ++++----------------------
 1 file changed, 14 insertions(+), 85 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1f72517057e8..7cf4bf3583a9 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1092,82 +1092,17 @@ static int rdtgroup_mode_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-/**
- * rdt_cdp_peer_get - Retrieve CDP peer if it exists
- * @r: RDT resource to which RDT domain @d belongs
- * @d: Cache instance for which a CDP peer is requested
- * @r_cdp: RDT resource that shares hardware with @r (RDT resource peer)
- *         Used to return the result.
- * @d_cdp: RDT domain that shares hardware with @d (RDT domain peer)
- *         Used to return the result.
- * @peer_type: The CDP configuration type of the peer resource.
- *
- * RDT resources are managed independently and by extension the RDT domains
- * (RDT resource instances) are managed independently also. The Code and
- * Data Prioritization (CDP) RDT resources, while managed independently,
- * could refer to the same underlying hardware. For example,
- * RDT_RESOURCE_L2CODE and RDT_RESOURCE_L2DATA both refer to the L2 cache.
- *
- * When provided with an RDT resource @r and an instance of that RDT
- * resource @d rdt_cdp_peer_get() will return if there is a peer RDT
- * resource and the exact instance that shares the same hardware.
- *
- * Return: 0 if a CDP peer was found, <0 on error or if no CDP peer exists.
- *         If a CDP peer was found, @r_cdp will point to the peer RDT resource
- *         and @d_cdp will point to the peer RDT domain.
- */
-static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
-			    struct rdt_resource **r_cdp,
-			    struct rdt_domain **d_cdp,
-			    enum resctrl_conf_type *peer_type)
+static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
 {
-	struct rdt_resource *_r_cdp = NULL;
-	struct rdt_domain *_d_cdp = NULL;
-	int ret = 0;
-
-	switch (r->rid) {
-	case RDT_RESOURCE_L3DATA:
-		_r_cdp = &rdt_resources_all[RDT_RESOURCE_L3CODE].r_resctrl;
-		*peer_type = CDP_CODE;
-		break;
-	case RDT_RESOURCE_L3CODE:
-		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl;
-		*peer_type = CDP_DATA;
-		break;
-	case RDT_RESOURCE_L2DATA:
-		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2CODE].r_resctrl;
-		*peer_type = CDP_CODE;
-		break;
-	case RDT_RESOURCE_L2CODE:
-		_r_cdp =  &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl;
-		*peer_type = CDP_DATA;
-		break;
+	switch (my_type) {
+	case CDP_CODE:
+		return CDP_DATA;
+	case CDP_DATA:
+		return CDP_CODE;
 	default:
-		ret = -ENOENT;
-		goto out;
+	case CDP_NONE:
+		return CDP_NONE;
 	}
-
-	/*
-	 * When a new CPU comes online and CDP is enabled then the new
-	 * RDT domains (if any) associated with both CDP RDT resources
-	 * are added in the same CPU online routine while the
-	 * rdtgroup_mutex is held. It should thus not happen for one
-	 * RDT domain to exist and be associated with its RDT CDP
-	 * resource but there is no RDT domain associated with the
-	 * peer RDT CDP resource. Hence the WARN.
-	 */
-	_d_cdp = rdt_find_domain(_r_cdp, d->id, NULL);
-	if (WARN_ON(IS_ERR_OR_NULL(_d_cdp))) {
-		_r_cdp = NULL;
-		_d_cdp = NULL;
-		ret = -EINVAL;
-	}
-
-out:
-	*r_cdp = _r_cdp;
-	*d_cdp = _d_cdp;
-
-	return ret;
 }
 
 /**
@@ -1248,19 +1183,16 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
 bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
 			   unsigned long cbm, int closid, bool exclusive)
 {
-	enum resctrl_conf_type peer_type;
+	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
 	struct rdt_resource *r = s->res;
-	struct rdt_resource *r_cdp;
-	struct rdt_domain *d_cdp;
 
 	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
 				    exclusive))
 		return true;
 
-	if (rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp, &peer_type) < 0)
+	if (!resctrl_arch_get_cdp_enabled(r->rid))
 		return false;
-
-	return  __rdtgroup_cbm_overlaps(r_cdp, d_cdp, cbm, closid, peer_type, exclusive);
+	return  __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
 }
 
 /**
@@ -2756,11 +2688,9 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
 static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 				 u32 closid)
 {
+	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
 	enum resctrl_conf_type t = s->conf_type;
-	struct rdt_resource *r_cdp = NULL;
 	struct resctrl_staged_config *cfg;
-	enum resctrl_conf_type peer_type;
-	struct rdt_domain *d_cdp = NULL;
 	struct rdt_resource *r = s->res;
 	u32 used_b = 0, unused_b = 0;
 	unsigned long tmp_cbm;
@@ -2768,7 +2698,6 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	u32 peer_ctl, ctrl_val;
 	int i;
 
-	rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp, &peer_type);
 	cfg = &d->staged_config[t];
 	cfg->have_new_ctrl = false;
 	cfg->new_ctrl = r->cache.shareable_bits;
@@ -2788,8 +2717,8 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 			 * usage to ensure there is no overlap
 			 * with an exclusive group.
 			 */
-			if (d_cdp)
-				resctrl_arch_get_config(r_cdp, d_cdp, i, peer_type, &peer_ctl);
+			if (resctrl_arch_get_cdp_enabled(r->rid))
+				resctrl_arch_get_config(r, d, i, peer_type, &peer_ctl);
 			else
 				peer_ctl = 0;
 			resctrl_arch_get_config(r, d, i, s->conf_type, &ctrl_val);
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 23/24] x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (21 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 22/24] x86/resctrl: Remove rdt_cdp_peer_get() James Morse
@ 2021-07-15 17:30 ` James Morse
  2021-07-15 17:30 ` [PATCH v6 24/24] x86/resctrl: Merge the CDP resources James Morse
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

resctrl_arch_update_domains() specifies the one closid that has
been modified and needs copying to the hardware.
resctrl_arch_update_domains() takes a struct rdt_resource and a
closid as arguments, but copies all the staged configurations
for that closid into the ctrl_val[] array.

resctrl_arch_update_domains() is called once per schema, but
once the resources and domains are merged, the second call of
a L2CODE/L2DATA pair will find no staged configurations, as
they were previously applied. The msr_param of the first call
only has one index, so would only have update the hardware
for the last staged configuration.

To avoid a second round of IPIs when changing L2CODE and L2DATA
in one go, expand the range of the msr_param if multiple staged
configurations are found.

Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
No changes since v3.

Changes since v2:
 * This patch is new.
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 04d54d942527..9e1c6730520b 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -292,6 +292,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 		return -ENOMEM;
 
 	mba_sc = is_mba_sc(r);
+	msr_param.res = NULL;
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
 		for (t = 0; t < CDP_NUM_TYPES; t++) {
@@ -303,9 +304,14 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc))
 				continue;
 
-			msr_param.low = idx;
-			msr_param.high = msr_param.low + 1;
-			msr_param.res = r;
+			if (!msr_param.res) {
+				msr_param.low = idx;
+				msr_param.high = msr_param.low + 1;
+				msr_param.res = r;
+			} else {
+				msr_param.low = min(msr_param.low, idx);
+				msr_param.high = max(msr_param.high, idx + 1);
+			}
 		}
 	}
 
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* [PATCH v6 24/24] x86/resctrl: Merge the CDP resources
  2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
                   ` (22 preceding siblings ...)
  2021-07-15 17:30 ` [PATCH v6 23/24] x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range James Morse
@ 2021-07-15 17:30 ` James Morse
  23 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-15 17:30 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger, James Morse,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

resctrl uses struct rdt_resource to describe the available hardware
resources. The domains of the CDP aliases share a single ctrl_val[]
array. The only differences between the struct rdt_hw_resource
aliases is the name and conf_type.

The name from struct rdt_hw_resource is visible to user-space. To
support another architecture, as many user-visible details should be
handled in the filesystem parts of the code that is common to all
architectures. The name and conf_type go together.

Remove conf_type and the CDP aliases. When CDP is supported and
enabled, schemata_list_create() can create two schema using the
single resource, generating the CODE/DATA suffix to the schema
name itself.
This allows the alloc_ctrlval_array() and complications around free()ing
the ctrl_val arrays to be removed.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v3:
 * Added braces around an else
 * Removed a space.

Changes since v2:
 * Removed stray conf_type that remained in the arch specific struct
 * Shuffled commit message,

Changes since v1:
 * rdt_get_cdp_config() is kept for its comment.
---
 arch/x86/kernel/cpu/resctrl/core.c     | 178 ++-----------------------
 arch/x86/kernel/cpu/resctrl/internal.h |   6 -
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 140 +++++++++----------
 3 files changed, 85 insertions(+), 239 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 4c0b1265ffd4..4b8813bafffd 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -62,7 +62,6 @@ mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
 struct rdt_hw_resource rdt_resources_all[] = {
 	[RDT_RESOURCE_L3] =
 	{
-		.conf_type			= CDP_NONE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3,
 			.name			= "L3",
@@ -78,45 +77,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
 		.msr_update		= cat_wrmsr,
 	},
-	[RDT_RESOURCE_L3DATA] =
-	{
-		.conf_type			= CDP_DATA,
-		.r_resctrl = {
-			.rid			= RDT_RESOURCE_L3DATA,
-			.name			= "L3DATA",
-			.cache_level		= 3,
-			.cache = {
-				.min_cbm_bits	= 1,
-			},
-			.domains		= domain_init(RDT_RESOURCE_L3DATA),
-			.parse_ctrlval		= parse_cbm,
-			.format_str		= "%d=%0*x",
-			.fflags			= RFTYPE_RES_CACHE,
-		},
-		.msr_base		= MSR_IA32_L3_CBM_BASE,
-		.msr_update		= cat_wrmsr,
-	},
-	[RDT_RESOURCE_L3CODE] =
-	{
-		.conf_type			= CDP_CODE,
-		.r_resctrl = {
-			.rid			= RDT_RESOURCE_L3CODE,
-			.name			= "L3CODE",
-			.cache_level		= 3,
-			.cache = {
-				.min_cbm_bits	= 1,
-			},
-			.domains		= domain_init(RDT_RESOURCE_L3CODE),
-			.parse_ctrlval		= parse_cbm,
-			.format_str		= "%d=%0*x",
-			.fflags			= RFTYPE_RES_CACHE,
-		},
-		.msr_base		= MSR_IA32_L3_CBM_BASE,
-		.msr_update		= cat_wrmsr,
-	},
 	[RDT_RESOURCE_L2] =
 	{
-		.conf_type			= CDP_NONE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2,
 			.name			= "L2",
@@ -132,45 +94,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
 		.msr_update		= cat_wrmsr,
 	},
-	[RDT_RESOURCE_L2DATA] =
-	{
-		.conf_type			= CDP_DATA,
-		.r_resctrl = {
-			.rid			= RDT_RESOURCE_L2DATA,
-			.name			= "L2DATA",
-			.cache_level		= 2,
-			.cache = {
-				.min_cbm_bits	= 1,
-			},
-			.domains		= domain_init(RDT_RESOURCE_L2DATA),
-			.parse_ctrlval		= parse_cbm,
-			.format_str		= "%d=%0*x",
-			.fflags			= RFTYPE_RES_CACHE,
-		},
-		.msr_base		= MSR_IA32_L2_CBM_BASE,
-		.msr_update		= cat_wrmsr,
-	},
-	[RDT_RESOURCE_L2CODE] =
-	{
-		.conf_type			= CDP_CODE,
-		.r_resctrl = {
-			.rid			= RDT_RESOURCE_L2CODE,
-			.name			= "L2CODE",
-			.cache_level		= 2,
-			.cache = {
-				.min_cbm_bits	= 1,
-			},
-			.domains		= domain_init(RDT_RESOURCE_L2CODE),
-			.parse_ctrlval		= parse_cbm,
-			.format_str		= "%d=%0*x",
-			.fflags			= RFTYPE_RES_CACHE,
-		},
-		.msr_base		= MSR_IA32_L2_CBM_BASE,
-		.msr_update		= cat_wrmsr,
-	},
 	[RDT_RESOURCE_MBA] =
 	{
-		.conf_type			= CDP_NONE,
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_MBA,
 			.name			= "MB",
@@ -339,40 +264,24 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 	r->alloc_enabled = true;
 }
 
-static void rdt_get_cdp_config(int level, int type)
+static void rdt_get_cdp_config(int level)
 {
-	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
-	struct rdt_hw_resource *hw_res_l = resctrl_to_arch_res(r_l);
-	struct rdt_resource *r = &rdt_resources_all[type].r_resctrl;
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
-	hw_res->num_closid = hw_res_l->num_closid;
-	r->cache.cbm_len = r_l->cache.cbm_len;
-	r->default_ctrl = r_l->default_ctrl;
-	r->cache.shareable_bits = r_l->cache.shareable_bits;
-	r->data_width = (r->cache.cbm_len + 3) / 4;
-	r->alloc_capable = true;
 	/*
 	 * By default, CDP is disabled. CDP can be enabled by mount parameter
 	 * "cdp" during resctrl file system mount time.
 	 */
-	r->alloc_enabled = false;
 	rdt_resources_all[level].cdp_enabled = false;
-	rdt_resources_all[type].cdp_enabled = false;
-	r_l->cdp_capable = true;
-	r->cdp_capable = true;
+	rdt_resources_all[level].r_resctrl.cdp_capable = true;
 }
 
 static void rdt_get_cdp_l3_config(void)
 {
-	rdt_get_cdp_config(RDT_RESOURCE_L3, RDT_RESOURCE_L3DATA);
-	rdt_get_cdp_config(RDT_RESOURCE_L3, RDT_RESOURCE_L3CODE);
+	rdt_get_cdp_config(RDT_RESOURCE_L3);
 }
 
 static void rdt_get_cdp_l2_config(void)
 {
-	rdt_get_cdp_config(RDT_RESOURCE_L2, RDT_RESOURCE_L2DATA);
-	rdt_get_cdp_config(RDT_RESOURCE_L2, RDT_RESOURCE_L2CODE);
+	rdt_get_cdp_config(RDT_RESOURCE_L2);
 }
 
 static void
@@ -509,57 +418,6 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
 	}
 }
 
-static u32 *alloc_ctrlval_array(struct rdt_resource *r, struct rdt_domain *d,
-				bool mba_sc)
-{
-	/* these are for the underlying hardware, they may not match r/d */
-	struct rdt_domain *underlying_domain;
-	struct rdt_hw_resource *hw_res;
-	struct rdt_hw_domain *hw_dom;
-	bool remapped;
-
-	switch (r->rid) {
-	case RDT_RESOURCE_L3DATA:
-	case RDT_RESOURCE_L3CODE:
-		hw_res = &rdt_resources_all[RDT_RESOURCE_L3];
-		remapped = true;
-		break;
-	case RDT_RESOURCE_L2DATA:
-	case RDT_RESOURCE_L2CODE:
-		hw_res = &rdt_resources_all[RDT_RESOURCE_L2];
-		remapped = true;
-		break;
-	default:
-		hw_res = resctrl_to_arch_res(r);
-		remapped = false;
-	}
-
-	/*
-	 * If we changed the resource, we need to search for the underlying
-	 * domain. Doing this for all resources would make it tricky to add the
-	 * first resource, as domains aren't added to a resource list until
-	 * after the ctrlval arrays have been allocated.
-	 */
-	if (remapped)
-		underlying_domain = rdt_find_domain(&hw_res->r_resctrl, d->id,
-						    NULL);
-	else
-		underlying_domain = d;
-	hw_dom = resctrl_to_arch_dom(underlying_domain);
-
-	if (mba_sc) {
-		if (hw_dom->mbps_val)
-			return hw_dom->mbps_val;
-		return kmalloc_array(hw_res->num_closid,
-				     sizeof(*hw_dom->mbps_val), GFP_KERNEL);
-	} else {
-		if (hw_dom->ctrl_val)
-			return hw_dom->ctrl_val;
-		return kmalloc_array(hw_res->num_closid,
-				     sizeof(*hw_dom->ctrl_val), GFP_KERNEL);
-	}
-}
-
 static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
@@ -567,11 +425,13 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 	struct msr_param m;
 	u32 *dc, *dm;
 
-	dc = alloc_ctrlval_array(r, d, false);
+	dc = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->ctrl_val),
+			   GFP_KERNEL);
 	if (!dc)
 		return -ENOMEM;
 
-	dm = alloc_ctrlval_array(r, d, true);
+	dm = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->mbps_val),
+			   GFP_KERNEL);
 	if (!dm) {
 		kfree(dc);
 		return -ENOMEM;
@@ -730,14 +590,8 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 		if (d->plr)
 			d->plr->d = NULL;
 
-		/* temporary: these four don't have a unique ctrlval array */
-		if (r->rid != RDT_RESOURCE_L3CODE &&
-		    r->rid != RDT_RESOURCE_L3DATA &&
-		    r->rid != RDT_RESOURCE_L2CODE &&
-		    r->rid != RDT_RESOURCE_L2DATA) {
-			kfree(hw_dom->ctrl_val);
-			kfree(hw_dom->mbps_val);
-		}
+		kfree(hw_dom->ctrl_val);
+		kfree(hw_dom->mbps_val);
 		bitmap_free(d->rmid_busy_llc);
 		kfree(d->mbm_total);
 		kfree(d->mbm_local);
@@ -1017,11 +871,7 @@ static __init void rdt_init_res_defs_intel(void)
 		hw_res = resctrl_to_arch_res(r);
 
 		if (r->rid == RDT_RESOURCE_L3 ||
-		    r->rid == RDT_RESOURCE_L3DATA ||
-		    r->rid == RDT_RESOURCE_L3CODE ||
-		    r->rid == RDT_RESOURCE_L2 ||
-		    r->rid == RDT_RESOURCE_L2DATA ||
-		    r->rid == RDT_RESOURCE_L2CODE) {
+		    r->rid == RDT_RESOURCE_L2) {
 			r->cache.arch_has_sparse_bitmaps = false;
 			r->cache.arch_has_empty_bitmaps = false;
 			r->cache.arch_has_per_cpu_cfg = false;
@@ -1041,11 +891,7 @@ static __init void rdt_init_res_defs_amd(void)
 		hw_res = resctrl_to_arch_res(r);
 
 		if (r->rid == RDT_RESOURCE_L3 ||
-		    r->rid == RDT_RESOURCE_L3DATA ||
-		    r->rid == RDT_RESOURCE_L3CODE ||
-		    r->rid == RDT_RESOURCE_L2 ||
-		    r->rid == RDT_RESOURCE_L2DATA ||
-		    r->rid == RDT_RESOURCE_L2CODE) {
+		    r->rid == RDT_RESOURCE_L2) {
 			r->cache.arch_has_sparse_bitmaps = true;
 			r->cache.arch_has_empty_bitmaps = true;
 			r->cache.arch_has_per_cpu_cfg = true;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 0260b1a63b86..b82b7def4242 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -369,7 +369,6 @@ struct rdt_parse_data {
 
 /**
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
- * @conf_type:		The type that should be used when configuring. temporary
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
  * @num_closid:		Maximum number of closid this hardware can support,
  *			regardless of CDP. This is exposed via
@@ -387,7 +386,6 @@ struct rdt_parse_data {
  * msr_update and msr_base.
  */
 struct rdt_hw_resource {
-	enum resctrl_conf_type	conf_type;
 	struct rdt_resource	r_resctrl;
 	u32			num_closid;
 	unsigned int		msr_base;
@@ -418,11 +416,7 @@ extern struct dentry *debugfs_resctrl;
 
 enum resctrl_res_level {
 	RDT_RESOURCE_L3,
-	RDT_RESOURCE_L3DATA,
-	RDT_RESOURCE_L3CODE,
 	RDT_RESOURCE_L2,
-	RDT_RESOURCE_L2DATA,
-	RDT_RESOURCE_L2CODE,
 	RDT_RESOURCE_MBA,
 
 	/* Must be the last */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 7cf4bf3583a9..89123a4977cf 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1880,10 +1880,10 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 	if (!r->cdp_capable)
 		return;
 
-	if (r == &rdt_resources_all[RDT_RESOURCE_L2DATA].r_resctrl)
+	if (r->rid == RDT_RESOURCE_L2)
 		l2_qos_cfg_update(&hw_res->cdp_enabled);
 
-	if (r == &rdt_resources_all[RDT_RESOURCE_L3DATA].r_resctrl)
+	if (r->rid == RDT_RESOURCE_L3)
 		l3_qos_cfg_update(&hw_res->cdp_enabled);
 }
 
@@ -1912,68 +1912,42 @@ static int set_mba_sc(bool mba_sc)
 	return 0;
 }
 
-static int cdp_enable(int level, int data_type, int code_type)
+static int cdp_enable(int level)
 {
-	struct rdt_resource *r_ldata = &rdt_resources_all[data_type].r_resctrl;
-	struct rdt_resource *r_lcode = &rdt_resources_all[code_type].r_resctrl;
 	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
 	int ret;
 
-	if (!r_l->alloc_capable || !r_ldata->alloc_capable ||
-	    !r_lcode->alloc_capable)
+	if (!r_l->alloc_capable)
 		return -EINVAL;
 
 	ret = set_cache_qos_cfg(level, true);
-	if (!ret) {
-		r_l->alloc_enabled = false;
-		r_ldata->alloc_enabled = true;
-		r_lcode->alloc_enabled = true;
+	if (!ret)
 		rdt_resources_all[level].cdp_enabled = true;
-		rdt_resources_all[data_type].cdp_enabled = true;
-		rdt_resources_all[code_type].cdp_enabled = true;
-	}
+
 	return ret;
 }
 
-static void cdp_disable(int level, int data_type, int code_type)
+static void cdp_disable(int level)
 {
 	struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
-	struct rdt_resource *r = &r_hw->r_resctrl;
-
-	r->alloc_enabled = r->alloc_capable;
 
 	if (r_hw->cdp_enabled) {
-		rdt_resources_all[data_type].r_resctrl.alloc_enabled = false;
-		rdt_resources_all[code_type].r_resctrl.alloc_enabled = false;
 		set_cache_qos_cfg(level, false);
 		r_hw->cdp_enabled = false;
-		rdt_resources_all[data_type].cdp_enabled = false;
-		rdt_resources_all[code_type].cdp_enabled = false;
 	}
 }
 
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
 {
 	struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
-	enum resctrl_res_level code_type, data_type;
 
 	if (!hw_res->r_resctrl.cdp_capable)
 		return -EINVAL;
 
-	if (l == RDT_RESOURCE_L3) {
-		code_type = RDT_RESOURCE_L3CODE;
-		data_type = RDT_RESOURCE_L3DATA;
-	} else if (l == RDT_RESOURCE_L2) {
-		code_type = RDT_RESOURCE_L2CODE;
-		data_type = RDT_RESOURCE_L2DATA;
-	} else {
-		return -EINVAL;
-	}
-
 	if (enable)
-		return cdp_enable(l, data_type, code_type);
+		return cdp_enable(l);
 
-	cdp_disable(l, data_type, code_type);
+	cdp_disable(l);
 
 	return 0;
 }
@@ -2072,48 +2046,80 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx)
 	return ret;
 }
 
-static int schemata_list_create(void)
+static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
 {
 	struct resctrl_schema *s;
-	struct rdt_resource *r;
+	const char *suffix = "";
 	int ret, cl;
 
+	s = kzalloc(sizeof(*s), GFP_KERNEL);
+	if (!s)
+		return -ENOMEM;
+
+	s->res = r;
+	s->num_closid = resctrl_arch_get_num_closid(r);
+	if (resctrl_arch_get_cdp_enabled(r->rid))
+		s->num_closid /= 2;
+
+	s->conf_type = type;
+	switch (type) {
+	case CDP_CODE:
+		suffix = "CODE";
+		break;
+	case CDP_DATA:
+		suffix = "DATA";
+		break;
+	case CDP_NONE:
+		suffix = "";
+		break;
+	}
+
+	ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
+	if (ret >= sizeof(s->name)) {
+		kfree(s);
+		return -EINVAL;
+	}
+
+	cl = strlen(s->name);
+
+	/*
+	 * If CDP is supported by this resource, but not enabled,
+	 * include the suffix. This ensures the tabular format of the
+	 * schemata file does not change between mounts of the filesystem.
+	 */
+	if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
+		cl += 4;
+
+	if (cl > max_name_width)
+		max_name_width = cl;
+
+	INIT_LIST_HEAD(&s->list);
+	list_add(&s->list, &resctrl_schema_all);
+
+	return 0;
+}
+
+static int schemata_list_create(void)
+{
+	struct rdt_resource *r;
+	int ret = 0;
+
 	for_each_alloc_enabled_rdt_resource(r) {
-		s = kzalloc(sizeof(*s), GFP_KERNEL);
-		if (!s)
-			return -ENOMEM;
+		if (resctrl_arch_get_cdp_enabled(r->rid)) {
+			ret = schemata_list_add(r, CDP_CODE);
+			if (ret)
+				break;
 
-		s->res = r;
-		s->conf_type = resctrl_to_arch_res(r)->conf_type;
-		s->num_closid = resctrl_arch_get_num_closid(r);
-		if (resctrl_arch_get_cdp_enabled(r->rid))
-			s->num_closid /= 2;
-
-		ret = snprintf(s->name, sizeof(s->name), r->name);
-		if (ret >= sizeof(s->name)) {
-			kfree(s);
-			return -EINVAL;
+			ret = schemata_list_add(r, CDP_DATA);
+		} else {
+			ret = schemata_list_add(r, CDP_NONE);
 		}
 
-		cl = strlen(s->name);
-
-		/*
-		 * If CDP is supported by this resource, but not enabled,
-		 * include the suffix. This ensures the tabular format of the
-		 * schemata file does not change between mounts of the
-		 * filesystem.
-		 */
-		if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
-			cl += 4;
-
-		if (cl > max_name_width)
-			max_name_width = cl;
-
-		INIT_LIST_HEAD(&s->list);
-		list_add(&s->list, &resctrl_schema_all);
+		if (ret)
+			break;
 	}
 
-	return 0;
+	return ret;
 }
 
 static void schemata_list_destroy(void)
-- 
2.30.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

* Re: [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource
  2021-07-15 17:30 ` [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource James Morse
@ 2021-07-28 16:17   ` James Morse
  0 siblings, 0 replies; 26+ messages in thread
From: James Morse @ 2021-07-28 16:17 UTC (permalink / raw)
  To: x86, linux-kernel
  Cc: Fenghua Yu, Reinette Chatre, Thomas Gleixner, Ingo Molnar,
	Borislav Petkov, H Peter Anvin, Babu Moger,
	shameerali.kolothum.thodi, Jamie Iles, D Scott Phillips OS,
	lcherian, bobo.shaobowang

Hello,

On 15/07/2021 18:30, James Morse wrote:
> resctrl is the defacto Linux ABI for SoC resource partitioning features.
> 
> To support it on another architecture, it needs to be abstracted from
> the features provided by Intel RDT and AMD PQoS, and moved to /fs/.
> struct rdt_resource contains a mix of architecture private details
> and properties of the filesystem interface user-space uses.
> 
> Start by splitting struct rdt_resource, into an architecture private
> 'hw' struct, which contains the common resctrl structure that would be
> used by any architecture.

> The foreach helpers are most commonly used by
> the filesystem code, and should return the common resctrl structure.
> for_each_rdt_resource() is changed to walk the common structure in its
> parent arch private structure.

[...]

> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 6a5f60a37219..88d71c889328 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h

> @@ -524,33 +439,42 @@ enum {
>  	RDT_NUM_RESOURCES,
>  };
>  
> +static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
> +{
> +	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res);
> +
> +	hw_res++;
> +	return &hw_res->r_resctrl;
> +}
> +
> +/*
> + * To return the common struct rdt_resource, which is contained in struct
> + * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
> + * This makes the limit the resctrl member past the end of the array.
> + */
>  #define for_each_rdt_resource(r)					      \
> -	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
> -	     r++)
> +	for (r = &rdt_resources_all[0].r_resctrl;			      \
> +	     r < &rdt_resources_all[RDT_NUM_RESOURCES].r_resctrl;	      \
> +	     r = resctrl_inc(r))

Kbuild robot reports UBSAN doesn't like this, presumably the dastardly compiler has gone
and generated some accesses. Easily fixed, (but now looks less like the original)

v6's branch gets a patch on top, I'll squash this into v7:
----%<----
@@ -441,11 +441,10 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
 /*
  * To return the common struct rdt_resource, which is contained in struct
  * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
- * This makes the limit the resctrl member past the end of the array.
  */
 #define for_each_rdt_resource(r)                                             \
        for (r = &rdt_resources_all[0].r_resctrl;                             \
-            r < &rdt_resources_all[RDT_NUM_RESOURCES].r_resctrl;             \
+            r <= &rdt_resources_all[RDT_NUM_RESOURCES - 1].r_resctrl;        \
             r = resctrl_inc(r))

 #define for_each_capable_rdt_resource(r)                                     \
----%<----


Thanks,

James

^ permalink raw reply	[flat|nested] 26+ messages in thread

end of thread, other threads:[~2021-07-28 16:17 UTC | newest]

Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-15 17:30 [PATCH v6 00/24] x86/resctrl: Merge the CDP resources James Morse
2021-07-15 17:30 ` [PATCH v6 01/24] x86/resctrl: Split struct rdt_resource James Morse
2021-07-28 16:17   ` James Morse
2021-07-15 17:30 ` [PATCH v6 02/24] x86/resctrl: Split struct rdt_domain James Morse
2021-07-15 17:30 ` [PATCH v6 03/24] x86/resctrl: Add a separate schema list for resctrl James Morse
2021-07-15 17:30 ` [PATCH v6 04/24] x86/resctrl: Pass the schema in info dir's private pointer James Morse
2021-07-15 17:30 ` [PATCH v6 05/24] x86/resctrl: Label the resources with their configuration type James Morse
2021-07-15 17:30 ` [PATCH v6 06/24] x86/resctrl: Walk the resctrl schema list instead of an arch list James Morse
2021-07-15 17:30 ` [PATCH v6 07/24] x86/resctrl: Store the effective num_closid in the schema James Morse
2021-07-15 17:30 ` [PATCH v6 08/24] x86/resctrl: Add resctrl_arch_get_num_closid() James Morse
2021-07-15 17:30 ` [PATCH v6 09/24] x86/resctrl: Pass the schema to resctrl filesystem functions James Morse
2021-07-15 17:30 ` [PATCH v6 10/24] x86/resctrl: Swizzle rdt_resource and resctrl_schema in pseudo_lock_region James Morse
2021-07-15 17:30 ` [PATCH v6 11/24] x86/resctrl: Add a helper to read/set the CDP configuration James Morse
2021-07-15 17:30 ` [PATCH v6 12/24] x86/resctrl: Move the schemata names into struct resctrl_schema James Morse
2021-07-15 17:30 ` [PATCH v6 13/24] x86/resctrl: Group staged configuration into a separate struct James Morse
2021-07-15 17:30 ` [PATCH v6 14/24] x86/resctrl: Allow different CODE/DATA configurations to be staged James Morse
2021-07-15 17:30 ` [PATCH v6 15/24] x86/resctrl: Rename update_domains() resctrl_arch_update_domains() James Morse
2021-07-15 17:30 ` [PATCH v6 16/24] x86/resctrl: Add a helper to read a closid's configuration James Morse
2021-07-15 17:30 ` [PATCH v6 17/24] x86/resctrl: Pass configuration type to resctrl_arch_get_config() James Morse
2021-07-15 17:30 ` [PATCH v6 18/24] x86/resctrl: Make ctrlval arrays the same size James Morse
2021-07-15 17:30 ` [PATCH v6 19/24] x86/resctrl: Apply offset correction when config is staged James Morse
2021-07-15 17:30 ` [PATCH v6 20/24] x86/resctrl: Calculate the index from the configuration type James Morse
2021-07-15 17:30 ` [PATCH v6 21/24] x86/resctrl: Merge the ctrl_val arrays James Morse
2021-07-15 17:30 ` [PATCH v6 22/24] x86/resctrl: Remove rdt_cdp_peer_get() James Morse
2021-07-15 17:30 ` [PATCH v6 23/24] x86/resctrl: Expand resctrl_arch_update_domains()'s msr_param range James Morse
2021-07-15 17:30 ` [PATCH v6 24/24] x86/resctrl: Merge the CDP resources James Morse

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