[tip:perf/core] perf/x86/msr: Add AMD PTSC (Performance Time-Stamp Counter) support

[tip-bot for Huang Rui]

Commit-ID:  8a22426184774d7ced9c1d3aa4d95d34101fb3be
Gitweb:     http://git.kernel.org/tip/8a22426184774d7ced9c1d3aa4d95d34101fb3be
Author:     Huang Rui <ray.huang@xxxxxxx>
AuthorDate: Fri, 29 Jan 2016 16:29:56 +0800
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 31 Mar 2016 10:30:39 +0200

perf/x86/msr: Add AMD PTSC (Performance Time-Stamp Counter) support

AMD Carrizo (Family 15h, Model 60h) introduces a time-stamp counter
which is indicated by CPUID.8000_0001H:ECX[27]. It increments at a 100
MHz rate in all P-states, and C states, S0, or S1. The frequency is
about 100MHz. This counter will be used to calculate processor power
and other parts. So add an interface into the MSR PMU to get the PTSC
counter value.

Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Cc: Jacob Shin <jacob.w.shin@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Robert Richter <rric@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1454056197-5893-2-git-send-email-ray.huang@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/events/msr.c              | 8 ++++++++
 arch/x86/include/asm/cpufeatures.h | 1 +
 arch/x86/include/asm/msr-index.h   | 1 +
 3 files changed, 10 insertions(+)

diff --git a/arch/x86/events/msr.c b/arch/x86/events/msr.c
index ec863b9..6f6772f 100644
--- a/arch/x86/events/msr.c
+++ b/arch/x86/events/msr.c
@@ -6,6 +6,7 @@ enum perf_msr_id {
 	PERF_MSR_MPERF			= 2,
 	PERF_MSR_PPERF			= 3,
 	PERF_MSR_SMI			= 4,
+	PERF_MSR_PTSC			= 5,
 
 	PERF_MSR_EVENT_MAX,
 };
@@ -15,6 +16,11 @@ static bool test_aperfmperf(int idx)
 	return boot_cpu_has(X86_FEATURE_APERFMPERF);
 }
 
+static bool test_ptsc(int idx)
+{
+	return boot_cpu_has(X86_FEATURE_PTSC);
+}
+
 static bool test_intel(int idx)
 {
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
@@ -74,6 +80,7 @@ PMU_EVENT_ATTR_STRING(aperf, evattr_aperf, "event=0x01");
 PMU_EVENT_ATTR_STRING(mperf, evattr_mperf, "event=0x02");
 PMU_EVENT_ATTR_STRING(pperf, evattr_pperf, "event=0x03");
 PMU_EVENT_ATTR_STRING(smi,   evattr_smi,   "event=0x04");
+PMU_EVENT_ATTR_STRING(ptsc,  evattr_ptsc,  "event=0x05");
 
 static struct perf_msr msr[] = {
 	[PERF_MSR_TSC]   = { 0,			&evattr_tsc,	NULL,		 },
@@ -81,6 +88,7 @@ static struct perf_msr msr[] = {
 	[PERF_MSR_MPERF] = { MSR_IA32_MPERF,	&evattr_mperf,	test_aperfmperf, },
 	[PERF_MSR_PPERF] = { MSR_PPERF,		&evattr_pperf,	test_intel,	 },
 	[PERF_MSR_SMI]   = { MSR_SMI_COUNT,	&evattr_smi,	test_intel,	 },
+	[PERF_MSR_PTSC]   = { MSR_F15H_PTSC,	&evattr_ptsc,	test_ptsc,	 },
 };
 
 static struct attribute *events_attrs[PERF_MSR_EVENT_MAX + 1] = {
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 44ebd04..bdf9042 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -177,6 +177,7 @@
 #define X86_FEATURE_PERFCTR_CORE ( 6*32+23) /* core performance counter extensions */
 #define X86_FEATURE_PERFCTR_NB  ( 6*32+24) /* NB performance counter extensions */
 #define X86_FEATURE_BPEXT	(6*32+26) /* data breakpoint extension */
+#define X86_FEATURE_PTSC	( 6*32+27) /* performance time-stamp counter */
 #define X86_FEATURE_PERFCTR_L2	( 6*32+28) /* L2 performance counter extensions */
 #define X86_FEATURE_MWAITX	( 6*32+29) /* MWAIT extension (MONITORX/MWAITX) */
 
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 984ab75..6e6a5cc 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -326,6 +326,7 @@
 #define MSR_F15H_PERF_CTR		0xc0010201
 #define MSR_F15H_NB_PERF_CTL		0xc0010240
 #define MSR_F15H_NB_PERF_CTR		0xc0010241
+#define MSR_F15H_PTSC			0xc0010280
 #define MSR_F15H_IC_CFG			0xc0011021
 
 /* Fam 10h MSRs */