linux-kernel - [tip: perf/core] x86/cpufeatures: Add Architectural PerfMon Extension bit

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Date:   Mon, 09 Jan 2023 17:02:08 -0000
From:   "tip-bot2 for Kan Liang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kan Liang <kan.liang@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] x86/cpufeatures: Add Architectural PerfMon Extension bit

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     a018d2e3d4b1abc4a3cb64415c5d204fc5d2eafd
Gitweb:        https://git.kernel.org/tip/a018d2e3d4b1abc4a3cb64415c5d204fc5d2eafd
Author:        Kan Liang <kan.liang@...ux.intel.com>
AuthorDate:    Wed, 04 Jan 2023 12:13:44 -08:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Mon, 09 Jan 2023 12:22:08 +01:00

x86/cpufeatures: Add Architectural PerfMon Extension bit

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>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/r/20230104201349.1451191-4-kan.liang@linux.intel.com
---
 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 6101247..b64555b 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 */