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From: "Alastair D'Silva" <alastair@d-silva.org>
To: "'Dan Williams'" <dan.j.williams@intel.com>
Cc: "\'Aneesh Kumar K . V\'" <aneesh.kumar@linux.ibm.com>,
	"\'Oliver O\'Halloran\'" <oohall@gmail.com>,
	"\'Benjamin Herrenschmidt\'" <benh@kernel.crashing.org>,
	"\'Paul Mackerras\'" <paulus@samba.org>,
	"\'Michael Ellerman\'" <mpe@ellerman.id.au>,
	"\'Frederic Barrat\'" <fbarrat@linux.ibm.com>,
	"\'Andrew Donnellan\'" <ajd@linux.ibm.com>,
	"\'Arnd Bergmann\'" <arnd@arndb.de>,
	"\'Greg Kroah-Hartman\'" <gregkh@linuxfoundation.org>,
	"\'Vishal Verma\'" <vishal.l.verma@intel.com>,
	"\'Dave Jiang\'" <dave.jiang@intel.com>,
	"\'Ira Weiny\'" <ira.weiny@intel.com>,
	"\'Andrew Morton\'" <akpm@linux-foundation.org>,
	"\'Mauro Carvalho Chehab\'" <mchehab+samsung@kernel.org>,
	"\'David S. Miller\'" <davem@davemloft.net>,
	"\'Rob Herring\'" <robh@kernel.org>,
	"\'Anton Blanchard\'" <anton@ozlabs.org>,
	"\'Krzysztof Kozlowski\'" <krzk@kernel.org>,
	"\'Mahesh Salgaonkar\'" <mahesh@linux.vnet.ibm.com>,
	"\'Madhavan Srinivasan\'" <maddy@linux.vnet.ibm.com>,
	"\'Cédric Le Goater\'" <clg@kaod.org>,
	"\'Anju T Sudhakar\'" <anju@linux.vnet.ibm.com>,
	"\'Hari Bathini\'" <hbathini@linux.ibm.com>,
	"\'Thomas Gleixner\'" <tglx@linutronix.de>,
	"\'Greg Kurz\'" <groug@kaod.org>,
	"\'Nicholas Piggin\'" <npiggin@gmail.com>,
	"\'Masahiro Yamada\'" <yamada.masahiro@socionext.com>,
	"\'Alexey Kardashevskiy\'" <aik@ozlabs.ru>,
	"\'Linux Kernel Mailing List\'" <linux-kernel@vger.kernel.org>,
	'linuxppc-dev' <linuxppc-dev@lists.ozlabs.org>,
	'linux-nvdimm' <linux-nvdimm@lists.01.org>,
	"\'Linux MM\'" <linux-mm@kvack.org>
Subject: RE: [PATCH v4 07/25] ocxl: Add functions to map/unmap LPC memory
Date: Fri, 3 Apr 2020 14:50:36 +1100
Message-ID: <303a01d6096b$0ea3e120$2beba360$@d-silva.org> (raw)
In-Reply-To: <CAPcyv4gUU4PbQK1YJLfOToLDmFWsWWLySwkqHuoqGDvKZJGQvg@mail.gmail.com>


> -----Original Message-----
> From: Dan Williams <dan.j.williams@intel.com>
> Sent: Wednesday, 1 April 2020 7:49 PM
> To: Alastair D'Silva <alastair@d-silva.org>
> Cc: Aneesh Kumar K . V <aneesh.kumar@linux.ibm.com>; Oliver O'Halloran
> <oohall@gmail.com>; Benjamin Herrenschmidt
> <benh@kernel.crashing.org>; Paul Mackerras <paulus@samba.org>; Michael
> Ellerman <mpe@ellerman.id.au>; Frederic Barrat <fbarrat@linux.ibm.com>;
> Andrew Donnellan <ajd@linux.ibm.com>; Arnd Bergmann
> <arnd@arndb.de>; Greg Kroah-Hartman <gregkh@linuxfoundation.org>;
> Vishal Verma <vishal.l.verma@intel.com>; Dave Jiang
> <dave.jiang@intel.com>; Ira Weiny <ira.weiny@intel.com>; Andrew Morton
> <akpm@linux-foundation.org>; Mauro Carvalho Chehab
> <mchehab+samsung@kernel.org>; David S. Miller <davem@davemloft.net>;
> Rob Herring <robh@kernel.org>; Anton Blanchard <anton@ozlabs.org>;
> Krzysztof Kozlowski <krzk@kernel.org>; Mahesh Salgaonkar
> <mahesh@linux.vnet.ibm.com>; Madhavan Srinivasan
> <maddy@linux.vnet.ibm.com>; Cédric Le Goater <clg@kaod.org>; Anju T
> Sudhakar <anju@linux.vnet.ibm.com>; Hari Bathini
> <hbathini@linux.ibm.com>; Thomas Gleixner <tglx@linutronix.de>; Greg
> Kurz <groug@kaod.org>; Nicholas Piggin <npiggin@gmail.com>; Masahiro
> Yamada <yamada.masahiro@socionext.com>; Alexey Kardashevskiy
> <aik@ozlabs.ru>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>;
> linuxppc-dev <linuxppc-dev@lists.ozlabs.org>; linux-nvdimm <linux-
> nvdimm@lists.01.org>; Linux MM <linux-mm@kvack.org>
> Subject: Re: [PATCH v4 07/25] ocxl: Add functions to map/unmap LPC
> memory
> 
> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@d-silva.org>
> wrote:
> >
> > Add functions to map/unmap LPC memory
> >
> 
> "map memory" is an overloaded term. I'm guessing this patch has nothing to
> do with mapping memory in the MMU. Is it updating hardware resource
> decoders to start claiming address space that was allocated previously?
> 

It's similar to MMIO - these calls end up setting up a BAR which places the LPC
memory into a physical memory range addressable by the kernel.

> > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> > Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
> > ---
> >  drivers/misc/ocxl/core.c          | 51 +++++++++++++++++++++++++++++++
> >  drivers/misc/ocxl/ocxl_internal.h |  3 ++
> >  include/misc/ocxl.h               | 21 +++++++++++++
> >  3 files changed, 75 insertions(+)
> >
> > diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c index
> > 2531c6cf19a0..75ff14e3882a 100644
> > --- a/drivers/misc/ocxl/core.c
> > +++ b/drivers/misc/ocxl/core.c
> > @@ -210,6 +210,56 @@ static void unmap_mmio_areas(struct ocxl_afu
> *afu)
> >         release_fn_bar(afu->fn, afu->config.global_mmio_bar);  }
> >
> > +int ocxl_afu_map_lpc_mem(struct ocxl_afu *afu) {
> > +       struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
> > +
> > +       if ((afu->config.lpc_mem_size + afu-
> >config.special_purpose_mem_size) == 0)
> > +               return 0;
> > +
> > +       afu->lpc_base_addr = ocxl_link_lpc_map(afu->fn->link, dev);
> > +       if (afu->lpc_base_addr == 0)
> > +               return -EINVAL;
> > +
> > +       if (afu->config.lpc_mem_size > 0) {
> > +               afu->lpc_res.start = afu->lpc_base_addr + afu-
> >config.lpc_mem_offset;
> > +               afu->lpc_res.end = afu->lpc_res.start + afu->config.lpc_mem_size
> - 1;
> > +       }
> > +
> > +       if (afu->config.special_purpose_mem_size > 0) {
> > +               afu->special_purpose_res.start = afu->lpc_base_addr +
> > +                                                afu->config.special_purpose_mem_offset;
> > +               afu->special_purpose_res.end = afu->special_purpose_res.start +
> > +                                              afu->config.special_purpose_mem_size - 1;
> > +       }
> > +
> > +       return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(ocxl_afu_map_lpc_mem);
> > +
> > +struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu) {
> > +       return &afu->lpc_res;
> > +}
> > +EXPORT_SYMBOL_GPL(ocxl_afu_lpc_mem);
> > +
> > +static void unmap_lpc_mem(struct ocxl_afu *afu) {
> > +       struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
> > +
> > +       if (afu->lpc_res.start || afu->special_purpose_res.start) {
> > +               void *link = afu->fn->link;
> > +
> > +               // only release the link when the the last consumer calls release
> > +               ocxl_link_lpc_release(link, dev);
> > +
> > +               afu->lpc_res.start = 0;
> > +               afu->lpc_res.end = 0;
> > +               afu->special_purpose_res.start = 0;
> > +               afu->special_purpose_res.end = 0;
> > +       }
> > +}
> > +
> >  static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct
> > pci_dev *dev)  {
> >         int rc;
> > @@ -251,6 +301,7 @@ static int configure_afu(struct ocxl_afu *afu, u8
> > afu_idx, struct pci_dev *dev)
> >
> >  static void deconfigure_afu(struct ocxl_afu *afu)  {
> > +       unmap_lpc_mem(afu);
> >         unmap_mmio_areas(afu);
> >         reclaim_afu_pasid(afu);
> >         reclaim_afu_actag(afu);
> > diff --git a/drivers/misc/ocxl/ocxl_internal.h
> > b/drivers/misc/ocxl/ocxl_internal.h
> > index 2d7575225bd7..7b975a89db7b 100644
> > --- a/drivers/misc/ocxl/ocxl_internal.h
> > +++ b/drivers/misc/ocxl/ocxl_internal.h
> > @@ -52,6 +52,9 @@ struct ocxl_afu {
> >         void __iomem *global_mmio_ptr;
> >         u64 pp_mmio_start;
> >         void *private;
> > +       u64 lpc_base_addr; /* Covers both LPC & special purpose memory */
> > +       struct resource lpc_res;
> > +       struct resource special_purpose_res;
> >  };
> >
> >  enum ocxl_context_status {
> > diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h index
> > 357ef1aadbc0..d8b0b4d46bfb 100644
> > --- a/include/misc/ocxl.h
> > +++ b/include/misc/ocxl.h
> > @@ -203,6 +203,27 @@ int ocxl_irq_set_handler(struct ocxl_context
> > *ctx, int irq_id,
> >
> >  // AFU Metadata
> >
> > +/**
> > + * ocxl_afu_map_lpc_mem() - Map the LPC system & special purpose
> > +memory for an AFU
> > + * Do not call this during device discovery, as there may me multiple
> 
> s/me/be/
> 
> 
> > + * devices on a link, and the memory is mapped for the whole link,
> > +not
> > + * just one device. It should only be called after all devices have
> > + * registered their memory on the link.
> > + *
> > + * @afu: The AFU that has the LPC memory to map
> > + *
> > + * Returns 0 on success, negative on failure  */ int
> > +ocxl_afu_map_lpc_mem(struct ocxl_afu *afu);
> > +
> > +/**
> > + * ocxl_afu_lpc_mem() - Get the physical address range of LPC memory
> > +for an AFU
> > + * @afu: The AFU associated with the LPC memory
> > + *
> > + * Returns a pointer to the resource struct for the physical address
> > +range  */ struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu);
> > +
> >  /**
> >   * ocxl_afu_config() - Get a pointer to the config for an AFU
> >   * @afu: a pointer to the AFU to get the config for
> > --
> > 2.24.1
> >



-- 
Alastair D'Silva           mob: 0423 762 819
skype: alastair_dsilva     msn: alastair@d-silva.org
blog: http://alastair.d-silva.org    Twitter: @EvilDeece


  reply index

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  7:11 [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 01/25] powerpc/powernv: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-01 22:51     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 02/25] mm/memory_hotplug: Allow check_hotplug_memory_addressable to be called from drivers Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-02  4:33     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI LPC memory Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-02  4:36     ` Alastair D'Silva
2020-04-02 10:41     ` Benjamin Herrenschmidt
2020-04-03  4:27       ` Michael Ellerman
2020-03-27  7:11 ` [PATCH v4 04/25] ocxl: Remove unnecessary externs Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 05/25] ocxl: Address kernel doc errors & warnings Alastair D'Silva
2020-04-01  8:49   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 06/25] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2020-04-01  8:48   ` Dan Williams
2020-04-02  6:21     ` Andrew Donnellan
2020-03-27  7:11 ` [PATCH v4 07/25] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2020-04-01  8:49   ` Dan Williams
2020-04-03  3:50     ` Alastair D'Silva [this message]
2020-03-27  7:11 ` [PATCH v4 08/25] ocxl: Emit a log message showing how much LPC memory was detected Alastair D'Silva
2020-04-01  8:49   ` Dan Williams
2020-04-02  1:29     ` Joe Perches
2020-04-03  3:52     ` Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 09/25] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 10/25] nvdimm: Add driver for OpenCAPI Persistent Memory Alastair D'Silva
2020-03-29  2:56   ` Matthew Wilcox
2020-03-29  2:59     ` Matthew Wilcox
2020-04-01  8:49   ` Dan Williams
2020-04-01 19:35     ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 11/25] powerpc: Enable the OpenCAPI Persistent Memory driver for powernv_defconfig Alastair D'Silva
2020-04-01 20:26   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 12/25] nvdimm/ocxl: Add register addresses & status values to the header Alastair D'Silva
2020-04-01 20:27   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 13/25] nvdimm/ocxl: Read the capability registers & wait for device ready Alastair D'Silva
2020-04-02  0:20   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 14/25] nvdimm/ocxl: Add support for Admin commands Alastair D'Silva
2020-04-02  6:41   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 15/25] nvdimm/ocxl: Register a character device for userspace to interact with Alastair D'Silva
2020-04-02  0:27   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 16/25] nvdimm/ocxl: Implement the Read Error Log command Alastair D'Silva
2020-04-03  0:54   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 17/25] nvdimm/ocxl: Add controller dump IOCTLs Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 18/25] nvdimm/ocxl: Add an IOCTL to report controller statistics Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 19/25] nvdimm/ocxl: Forward events to userspace Alastair D'Silva
2020-04-02  2:08   ` Dan Williams
2020-03-27  7:11 ` [PATCH v4 20/25] nvdimm/ocxl: Add an IOCTL to request controller health & perf data Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 21/25] nvdimm/ocxl: Implement the heartbeat command Alastair D'Silva
2020-03-27  7:11 ` [PATCH v4 22/25] nvdimm/ocxl: Add debug IOCTLs Alastair D'Silva
2020-03-27  7:12 ` [PATCH v4 23/25] nvdimm/ocxl: Expose SMART data via ndctl Alastair D'Silva
2020-03-27  7:12 ` [PATCH v4 24/25] nvdimm/ocxl: Expose the serial number & firmware version in sysfs Alastair D'Silva
2020-03-27  7:12 ` [PATCH v4 25/25] MAINTAINERS: Add myself & nvdimm/ocxl to ocxl Alastair D'Silva
2020-04-01  8:47 ` [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices Dan Williams
2020-04-01 22:44   ` Alastair D'Silva
2020-04-02  3:42     ` Michael Ellerman
2020-04-02  3:50       ` Oliver O'Halloran
2020-04-02 10:06         ` Michael Ellerman
2020-04-02 11:10           ` Greg Kurz

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