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Subject[PATCH 4/7] x86/cpu: Add detection of AMD RAS Capabilities
Date
From: Yazen Ghannam <Yazen.Ghannam@amd.com>

Add a new CPUID leaf to hold the contents of CPUID 0x80000007_EBX (RasCap).

Define bits that are currently in use:
Bit 0: McaOverflowRecov
Bit 1: SUCCOR
Bit 3: ScalableMca

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/1462914639-29513-3-git-send-email-Yazen.Ghannam@amd.com
[ Shorten comment. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/include/asm/cpufeature.h | 1 +
arch/x86/include/asm/cpufeatures.h | 7 ++++++-
arch/x86/kernel/cpu/common.c | 10 +++++++---
3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 3636ec06c887..53ac9bbf2064 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -27,6 +27,7 @@ enum cpuid_leafs
CPUID_6_EAX,
CPUID_8000_000A_EDX,
CPUID_7_ECX,
+ CPUID_8000_0007_EBX,
};

#ifdef CONFIG_X86_FEATURE_NAMES
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 8f9afefd2dc5..d4e5018e9a44 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -12,7 +12,7 @@
/*
* Defines x86 CPU feature bits
*/
-#define NCAPINTS 17 /* N 32-bit words worth of info */
+#define NCAPINTS 18 /* N 32-bit words worth of info */
#define NBUGINTS 1 /* N 32-bit bug flags */

/*
@@ -280,6 +280,11 @@
#define X86_FEATURE_PKU (16*32+ 3) /* Protection Keys for Userspace */
#define X86_FEATURE_OSPKE (16*32+ 4) /* OS Protection Keys Enable */

+/* AMD-defined CPU features, CPUID level 0x80000007 (ebx), word 17 */
+#define X86_FEATURE_OVERFLOW_RECOV (17*32+0) /* MCA overflow recovery support */
+#define X86_FEATURE_SUCCOR (17*32+1) /* Uncorrectable error containment and recovery */
+#define X86_FEATURE_SMCA (17*32+3) /* Scalable MCA */
+
/*
* BUG word(s)
*/
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 8394b3d1f94f..dbc6f066e231 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -717,6 +717,13 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
}
}

+ if (c->extended_cpuid_level >= 0x80000007) {
+ cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
+
+ c->x86_capability[CPUID_8000_0007_EBX] = ebx;
+ c->x86_power = edx;
+ }
+
if (c->extended_cpuid_level >= 0x80000008) {
cpuid(0x80000008, &eax, &ebx, &ecx, &edx);

@@ -729,9 +736,6 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
c->x86_phys_bits = 36;
#endif

- if (c->extended_cpuid_level >= 0x80000007)
- c->x86_power = cpuid_edx(0x80000007);
-
if (c->extended_cpuid_level >= 0x8000000a)
c->x86_capability[CPUID_8000_000A_EDX] = cpuid_edx(0x8000000a);

--
2.7.3
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