linux-kernel - [PATCH V2 4/9] x86/cpufeatures: Add Architectural PerfMon Extension bit

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Date:   Wed,  4 Jan 2023 12:13:44 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     ak@...ux.intel.com, eranian@...gle.com, irogers@...gle.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V2 4/9] x86/cpufeatures: Add Architectural PerfMon Extension bit

From: Kan Liang <kan.liang@...ux.intel.com>

CPUID.(EAX=07H, ECX=1):EAX[8] indicates whether the Architectural
PerfMon Extension leaf (CPUID leaf 23) is supported.

The "X86_FEATURE_..., word 12" is already mirrored from CPUID
"0x00000007:1 (EAX)". Add X86_FEATURE_ARCH_PERFMON_EXT under the
"word 12" section.

The new Architectural PerfMon Extension leaf (CPUID leaf 23) will be
supported in the perf_events subsystem later.

The feature will not appear in /proc/cpuinfo.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---

Change since V1
- Rebase on top of 6.2-rc1

 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 61012476d66e..b64555b68a14 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -312,6 +312,7 @@
 #define X86_FEATURE_AVX_VNNI		(12*32+ 4) /* AVX VNNI instructions */
 #define X86_FEATURE_AVX512_BF16		(12*32+ 5) /* AVX512 BFLOAT16 instructions */
 #define X86_FEATURE_CMPCCXADD           (12*32+ 7) /* "" CMPccXADD instructions */
+#define X86_FEATURE_ARCH_PERFMON_EXT	(12*32+ 8) /* "" Intel Architectural PerfMon Extension */
 #define X86_FEATURE_AMX_FP16		(12*32+21) /* "" AMX fp16 Support */
 #define X86_FEATURE_AVX_IFMA            (12*32+23) /* "" Support for VPMADD52[H,L]UQ */
 
-- 
2.35.1