x86/cpu: Add detection of AMD RAS Capabilities

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>
[ Shorten comment. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1462971509-3856-5-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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);