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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 v5 1/7] powerpc: Add TIDR CPU feature for POWER9
Date: Fri, 11 May 2018 16:12:57 +1000	[thread overview]
Message-ID: <20180511061303.10728-2-alastair@au1.ibm.com> (raw)
In-Reply-To: <20180511061303.10728-1-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/kernel/dt_cpu_ftrs.c   | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 66fcab13c8b4..9c0a3083571b 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/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 8ab51f6ca03a..415555e5b69f 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -716,6 +716,7 @@ 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;
 	}
 
 	/*
-- 
2.17.0

  reply	other threads:[~2018-05-11  6:16 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-11  6:12 [PATCH v5 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI Alastair D'Silva
2018-05-11  6:12 ` Alastair D'Silva [this message]
2018-05-11  8:38   ` [PATCH v5 1/7] powerpc: Add TIDR CPU feature for POWER9 Frederic Barrat
2018-05-31  4:19   ` Andrew Donnellan
2018-06-04 14:10   ` [v5,1/7] " Michael Ellerman
2018-05-11  6:12 ` [PATCH v5 2/7] powerpc: Use TIDR CPU feature to control TIDR allocation Alastair D'Silva
2018-05-11  8:46   ` Frederic Barrat
2018-05-31  4:20   ` Andrew Donnellan
2018-05-11  6:12 ` [PATCH v5 3/7] powerpc: use task_pid_nr() for TID allocation Alastair D'Silva
2018-05-11  8:48   ` Frederic Barrat
2018-05-31  4:29   ` Andrew Donnellan
2018-05-11  6:13 ` [PATCH v5 4/7] ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action Alastair D'Silva
2018-05-11  8:49   ` Frederic Barrat
2018-05-31  4:32   ` Andrew Donnellan
2018-05-11  6:13 ` [PATCH v5 5/7] ocxl: Expose the thread_id needed for wait on POWER9 Alastair D'Silva
2018-05-11  9:25   ` Frederic Barrat
2018-05-11 10:06     ` Alastair D'Silva
2018-05-11 11:03       ` Frederic Barrat
2018-05-31  4:42   ` Andrew Donnellan
2018-05-11  6:13 ` [PATCH v5 6/7] ocxl: Add an IOCTL so userspace knows what OCXL features are available Alastair D'Silva
2018-05-11  9:27   ` Frederic Barrat
2018-05-31  4:46   ` Andrew Donnellan
2018-05-11  6:13 ` [PATCH v5 7/7] ocxl: Document new OCXL IOCTLs Alastair D'Silva
2018-05-11  9:28   ` Frederic Barrat
2018-05-31  4:48   ` Andrew Donnellan

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