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From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	mikey@neuling.org, vaibhav@linux.vnet.ibm.com,
	aneesh.kumar@linux.vnet.ibm.com, malat@debian.org,
	felix@linux.vnet.ibm.com, pombredanne@nexb.com,
	sukadev@linux.vnet.ibm.com, npiggin@gmail.com,
	gregkh@linuxfoundation.org, arnd@arndb.de,
	andrew.donnellan@au1.ibm.com, fbarrat@linux.vnet.ibm.com,
	corbet@lwn.net, "Alastair D'Silva" <alastair@d-silva.org>
Subject: [PATCH 1/7] powerpc: Add TIDR CPU feature for Power9
Date: Tue, 17 Apr 2018 12:09:44 +1000	[thread overview]
Message-ID: <20180417020950.21446-2-alastair@au1.ibm.com> (raw)
In-Reply-To: <20180417020950.21446-1-alastair@au1.ibm.com>

From: Alastair D'Silva <alastair@d-silva.org>

This patch adds a CPU feature bit to show whether the CPU has
the TIDR register available, enabling as_notify/wait in userspace.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
 arch/powerpc/include/asm/cputable.h  | 3 ++-
 arch/powerpc/include/asm/switch_to.h | 1 -
 arch/powerpc/kernel/dt_cpu_ftrs.c    | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 4e332f3531c5..54c4cbbe57b4 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -215,6 +215,7 @@ static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTR_P9_TM_HV_ASSIST		LONG_ASM_CONST(0x0000100000000000)
 #define CPU_FTR_P9_TM_XER_SO_BUG	LONG_ASM_CONST(0x0000200000000000)
 #define CPU_FTR_P9_TLBIE_BUG		LONG_ASM_CONST(0x0000400000000000)
+#define CPU_FTR_P9_TIDR			LONG_ASM_CONST(0x0000800000000000)
 
 #ifndef __ASSEMBLY__
 
@@ -462,7 +463,7 @@ static inline void cpu_feature_keys_init(void) { }
 	    CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
 	    CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_ARCH_207S | \
 	    CPU_FTR_TM_COMP | CPU_FTR_ARCH_300 | CPU_FTR_PKEY | \
-	    CPU_FTR_P9_TLBIE_BUG)
+	    CPU_FTR_P9_TLBIE_BUG | CPU_FTR_P9_TIDR)
 #define CPU_FTRS_POWER9_DD1 ((CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD1) & \
 			     (~CPU_FTR_SAO))
 #define CPU_FTRS_POWER9_DD2_0 CPU_FTRS_POWER9
diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
index be8c9fa23983..5b03d8a82409 100644
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -94,6 +94,5 @@ static inline void clear_task_ebb(struct task_struct *t)
 extern int set_thread_uses_vas(void);
 
 extern int set_thread_tidr(struct task_struct *t);
-extern void clear_thread_tidr(struct task_struct *t);
 
 #endif /* _ASM_POWERPC_SWITCH_TO_H */
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 11a3a4fed3fb..10f8b7f55637 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -722,6 +722,7 @@ static __init void cpufeatures_cpu_quirks(void)
 	if ((version & 0xffff0000) == 0x004e0000) {
 		cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
 		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_BUG;
+		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR;
 	}
 }
 
-- 
2.14.3

  reply	other threads:[~2018-04-17  2:09 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-17  2:09 [PATCH 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva
2018-04-17  2:09 ` Alastair D'Silva [this message]
2018-04-17  4:09   ` [PATCH 1/7] powerpc: Add TIDR CPU feature for Power9 Andrew Donnellan
2018-04-17  2:09 ` [PATCH 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva
2018-04-17  4:21   ` Andrew Donnellan
2018-04-17  5:31     ` Alastair D'Silva
2018-04-17  2:09 ` [PATCH 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva
2018-04-17  2:09 ` [PATCH 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva
2018-04-17  5:37   ` Andrew Donnellan
2018-04-17  2:09 ` [PATCH 5/7] ocxl: Expose the thread_id needed for wait on p9 Alastair D'Silva
2018-04-17  2:09 ` [PATCH 6/7] ocxl: Add an IOCTL so userspace knows which platform the kernel requires Alastair D'Silva
2018-04-17  2:09 ` [PATCH 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva
2018-04-17  3:45   ` Andrew Donnellan
2018-04-18  1:08 ` [PATCH v2 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva
2018-04-18  1:08   ` [PATCH v2 1/7] powerpc: Add TIDR CPU feature for Power9 Alastair D'Silva
2018-04-18  7:03     ` Andrew Donnellan
2018-05-07 17:17     ` Frederic Barrat
2018-05-08  3:13       ` Alastair D'Silva
2018-04-18  1:08   ` [PATCH v2 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva
2018-04-18  7:13     ` Andrew Donnellan
2018-05-07 17:19     ` Frederic Barrat
2018-04-18  1:08   ` [PATCH v2 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva
2018-04-20  8:43     ` Andrew Donnellan
2018-04-24 21:12       ` Sukadev Bhattiprolu
2018-04-26  9:25         ` Andrew Donnellan
2018-05-07 17:37     ` Frederic Barrat
2018-05-08  0:40       ` Alastair D'Silva
2018-04-18  1:08   ` [PATCH v2 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva
2018-05-07 17:38     ` Frederic Barrat
2018-04-18  1:08   ` [PATCH v2 5/7] ocxl: Expose the thread_id needed for wait on p9 Alastair D'Silva
2018-04-23  7:16     ` Andrew Donnellan
2018-05-07 18:08     ` Frederic Barrat
2018-04-18  1:08   ` [PATCH v2 6/7] ocxl: Add an IOCTL so userspace knows what CPU features are available Alastair D'Silva
2018-04-20  7:25     ` Andrew Donnellan
2018-05-07 18:14     ` Frederic Barrat
2018-05-08  0:41       ` Alastair D'Silva
2018-05-08  3:50         ` Nicholas Piggin
2018-05-08  3:54           ` Alastair D'Silva
2018-04-18  1:08   ` [PATCH v2 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva
2018-04-18  7:29     ` Andrew Donnellan
2018-05-07 18:15     ` Frederic Barrat
2018-05-09  0:42 ` [PATCH v3 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva
2018-05-09  0:42   ` [PATCH v3 1/7] powerpc: Add TIDR CPU feature for POWER9 Alastair D'Silva
2018-05-09  0:42   ` [PATCH v3 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva
2018-05-09  0:42   ` [PATCH v3 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva
2018-05-09  0:42   ` [PATCH v3 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva
2018-05-09  0:42   ` [PATCH v3 5/7] ocxl: Expose the thread_id needed for wait on POWER9 Alastair D'Silva
2018-05-11  5:01     ` Michael Ellerman
2018-05-09  0:42   ` [PATCH v3 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available Alastair D'Silva
2018-05-09  0:42   ` [PATCH v3 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva
2018-05-09  5:34   ` [PATCH v4 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva
2018-05-09  5:35     ` [PATCH v4 1/7] powerpc: Add TIDR CPU feature for POWER9 Alastair D'Silva
2018-05-09  5:35     ` [PATCH v4 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva
2018-05-09  5:35     ` [PATCH v4 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva
2018-05-09  5:35     ` [PATCH v4 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva
2018-05-09  5:35     ` [PATCH v4 5/7] ocxl: Expose the thread_id needed for wait on POWER9 Alastair D'Silva
2018-05-09  5:35     ` [PATCH v4 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available Alastair D'Silva
2018-05-11  5:20       ` Michael Ellerman
2018-05-09  5:35     ` [PATCH v4 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva

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