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Subject[PATCH 3/3] x86/cpu: Add CLZERO detection
Date
From: Wan Zongshun <Vincent.Wan@amd.com>

AMD Fam17h processors introduce support for the CLZERO instruction. It
zeroes out the 64 byte cache line specified in RAX.

Add the bit here to allow /proc/cpuinfo to list the feature.

Boris: we're adding this as a separate ->x86_capability leaf because
CPUID_80000008_EBX is going to contain more feature bits and it will
fill out with time.

Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/1446059010-28010-3-git-send-email-Aravind.Gopalakrishnan@amd.com
[Wrap code in patch form, fix comments. ]
Signed-off-by: Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/include/asm/cpufeature.h | 5 ++++-
arch/x86/kernel/cpu/common.c | 1 +
2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 9727b3b48bd1..e4f8010f22e0 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -12,7 +12,7 @@
#include <asm/disabled-features.h>
#endif

-#define NCAPINTS 13 /* N 32-bit words worth of info */
+#define NCAPINTS 14 /* N 32-bit words worth of info */
#define NBUGINTS 1 /* N 32-bit bug flags */

/*
@@ -255,6 +255,9 @@
/* Intel-defined CPU QoS Sub-leaf, CPUID level 0x0000000F:1 (edx), word 12 */
#define X86_FEATURE_CQM_OCCUP_LLC (12*32+ 0) /* LLC occupancy monitoring if 1 */

+/* AMD-defined CPU features, CPUID level 0x80000008 (ebx), word 13 */
+#define X86_FEATURE_CLZERO (13*32+0) /* CLZERO instruction */
+
/*
* BUG word(s)
*/
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index de22ea7ff82f..4ddd780aeac9 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -670,6 +670,7 @@ void get_cpu_cap(struct cpuinfo_x86 *c)

c->x86_virt_bits = (eax >> 8) & 0xff;
c->x86_phys_bits = eax & 0xff;
+ c->x86_capability[13] = cpuid_ebx(0x80000008);
}
#ifdef CONFIG_X86_32
else if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36))
--
2.3.5


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