linux-kernel - [RFC PATCH v2 2/2] perf/x86/rapl: Enable Core RAPL for AMD

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Message-ID: <20230301181449.14647-3-wyes.karny@amd.com>
Date:   Wed, 1 Mar 2023 18:14:49 +0000
From:   Wyes Karny <wyes.karny@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "Namhyung Kim" <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Borislav Petkov" <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, <hpa@...or.com>,
        Stephane Eranian <eranian@...gle.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>
CC:     <x86@...nel.org>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <gautham.shenoy@....com>,
        <ananth.narayan@....com>,
        Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Wyes Karny <wyes.karny@....com>
Subject: [RFC PATCH v2 2/2] perf/x86/rapl: Enable Core RAPL for AMD

AMD processors support per-package and per-core energy monitoring
through RAPL counters which can be accessed by users running in
supervisor mode.

Core RAPL counters gives power consumption information per core.  For
AMD processors the package level RAPL counter are already exposed to
perf. Expose the core level RAPL counters also.

sudo perf stat -a --per-core -C 0-127 -e power/energy-cores/

Output:
S0-D0-C0           2               8.73 Joules power/energy-cores/
S0-D0-C1           2               8.73 Joules power/energy-cores/
S0-D0-C2           2               8.73 Joules power/energy-cores/
S0-D0-C3           2               8.73 Joules power/energy-cores/
S0-D0-C4           2               8.73 Joules power/energy-cores/

Signed-off-by: Wyes Karny <wyes.karny@....com>
---
 arch/x86/events/rapl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index e6a0c077daf5..9cce8e590cc4 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -546,7 +546,7 @@ static struct perf_msr intel_rapl_spr_msrs[] = {
  * - want to use same event codes across both architectures
  */
 static struct perf_msr amd_rapl_msrs[] = {
-	[PERF_RAPL_PP0]  = { 0, &rapl_events_cores_group, 0, false, 0 },
+	[PERF_RAPL_PP0]  = { MSR_AMD_CORE_ENERGY_STATUS, &rapl_events_cores_group, test_msr, false, RAPL_MSR_MASK },
 	[PERF_RAPL_PKG]  = { MSR_AMD_PKG_ENERGY_STATUS,  &rapl_events_pkg_group,   test_msr, false, RAPL_MSR_MASK },
 	[PERF_RAPL_RAM]  = { 0, &rapl_events_ram_group,   0, false, 0 },
 	[PERF_RAPL_PP1]  = { 0, &rapl_events_gpu_group,   0, false, 0 },
@@ -773,7 +773,8 @@ static struct rapl_model model_spr = {
 };
 
 static struct rapl_model model_amd_hygon = {
-	.events		= BIT(PERF_RAPL_PKG),
+	.events		= BIT(PERF_RAPL_PP0) |
+			  BIT(PERF_RAPL_PKG),
 	.msr_power_unit = MSR_AMD_RAPL_POWER_UNIT,
 	.rapl_msrs      = amd_rapl_msrs,
 };
-- 
2.34.1