linux-kernel - [tip: perf/core] x86/msr: Add PerfCntrGlobal* registers

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Message-ID: <165126413302.4207.5780334274914327470.tip-bot2@tip-bot2>
Date:   Fri, 29 Apr 2022 20:28:53 -0000
From:   "tip-bot2 for Sandipan Das" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sandipan Das <sandipan.das@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] x86/msr: Add PerfCntrGlobal* registers

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

Commit-ID:     d9b0a81c777fcf9e412aef64a5f8f3e69bd150f5
Gitweb:        https://git.kernel.org/tip/d9b0a81c777fcf9e412aef64a5f8f3e69bd150f5
Author:        Sandipan Das <sandipan.das@....com>
AuthorDate:    Thu, 21 Apr 2022 11:16:54 +05:30
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 29 Apr 2022 11:06:26 +02:00

x86/msr: Add PerfCntrGlobal* registers

Add MSR definitions that will be used to enable the new AMD
Performance Monitoring Version 2 (PerfMonV2) features. These
include:

  * Performance Counter Global Control (PerfCntrGlobalCtl)
  * Performance Counter Global Status (PerfCntrGlobalStatus)
  * Performance Counter Global Status Clear (PerfCntrGlobalStatusClr)

The new Performance Counter Global Control and Status MSRs
provide an interface for enabling or disabling multiple
counters at the same time and for testing overflow without
probing the individual registers for each PMC.

The availability of these registers is indicated through the
PerfMonV2 feature bit of CPUID leaf 0x80000022 EAX.

Signed-off-by: Sandipan Das <sandipan.das@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/cdc0d8f75bd519848731b5c64d924f5a0619a573.1650515382.git.sandipan.das@amd.com
---
 arch/x86/include/asm/msr-index.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 8179ea3..58a44dc 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -524,6 +524,11 @@
 #define AMD_CPPC_DES_PERF(x)		(((x) & 0xff) << 16)
 #define AMD_CPPC_ENERGY_PERF_PREF(x)	(((x) & 0xff) << 24)
 
+/* AMD Performance Counter Global Status and Control MSRs */
+#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS	0xc0000300
+#define MSR_AMD64_PERF_CNTR_GLOBAL_CTL		0xc0000301
+#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR	0xc0000302
+
 /* Fam 17h MSRs */
 #define MSR_F17H_IRPERF			0xc00000e9