linux-kernel - [tip: perf/core] x86/cpufeatures: Add AMD Fam19h Branch Sampling feature

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Date:   Tue, 05 Apr 2022 08:36:43 -0000
From:   "tip-bot2 for Stephane Eranian" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] x86/cpufeatures: Add AMD Fam19h Branch Sampling feature

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

Commit-ID:     a77d41ac3a0f41c80120ec5b8b08ab284fec950a
Gitweb:        https://git.kernel.org/tip/a77d41ac3a0f41c80120ec5b8b08ab284fec950a
Author:        Stephane Eranian <eranian@...gle.com>
AuthorDate:    Tue, 22 Mar 2022 15:15:06 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 05 Apr 2022 10:24:36 +02:00

x86/cpufeatures: Add AMD Fam19h Branch Sampling feature

Add a cpu feature for AMD Fam19h Branch Sampling feature as bit
31 of EBX on CPUID leaf function 0x80000008.

Signed-off-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20220322221517.2510440-3-eranian@google.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 73e643a..0d62afd 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -315,6 +315,7 @@
 #define X86_FEATURE_VIRT_SSBD		(13*32+25) /* Virtualized Speculative Store Bypass Disable */
 #define X86_FEATURE_AMD_SSB_NO		(13*32+26) /* "" Speculative Store Bypass is fixed in hardware. */
 #define X86_FEATURE_CPPC		(13*32+27) /* Collaborative Processor Performance Control */
+#define X86_FEATURE_BRS			(13*32+31) /* Branch Sampling available */
 
 /* Thermal and Power Management Leaf, CPUID level 0x00000006 (EAX), word 14 */
 #define X86_FEATURE_DTHERM		(14*32+ 0) /* Digital Thermal Sensor */