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Message-ID: <1604666153-4187-4-git-send-email-john.garry@huawei.com>
Date: Fri, 6 Nov 2020 20:35:43 +0800
From: John Garry <john.garry@...wei.com>
To: <acme@...nel.org>, <will@...nel.org>, <mark.rutland@....com>,
<jolsa@...hat.com>, <irogers@...gle.com>, <leo.yan@...aro.org>,
<peterz@...radead.org>, <mingo@...hat.com>,
<alexander.shishkin@...ux.intel.com>, <namhyung@...nel.org>,
<mathieu.poirier@...aro.org>
CC: <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <qiangqing.zhang@....com>,
<zhangshaokun@...ilicon.com>, <linux-imx@....com>,
<kjain@...ux.ibm.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v5 03/13] perf pmu: Add pmu_id()
Add a function to read the PMU id sysfs entry. This is only done for uncore
PMUs where this would possibly be relevant.
Signed-off-by: John Garry <john.garry@...wei.com>
---
tools/perf/util/pmu.c | 18 ++++++++++++++++++
tools/perf/util/pmu.h | 1 +
2 files changed, 19 insertions(+)
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index d41caeb35cf6..cbeda45ce578 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -597,6 +597,7 @@ static struct perf_cpu_map *__pmu_cpumask(const char *path)
* Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
* may have a "cpus" file.
*/
+#define SYS_TEMPLATE_ID "./bus/event_source/devices/%s/identifier"
#define CPUS_TEMPLATE_UNCORE "%s/bus/event_source/devices/%s/cpumask"
#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"
@@ -635,6 +636,21 @@ static bool pmu_is_uncore(const char *name)
return file_available(path);
}
+static char *pmu_id(const char *name)
+{
+ char path[PATH_MAX], *str;
+ size_t len;
+
+ snprintf(path, PATH_MAX, SYS_TEMPLATE_ID, name);
+
+ if (sysfs__read_str(path, &str, &len) < 0)
+ return NULL;
+
+ str[len - 1] = 0; /* remove line feed */
+
+ return str;
+}
+
/*
* PMU CORE devices have different name other than cpu in sysfs on some
* platforms.
@@ -847,6 +863,8 @@ static struct perf_pmu *pmu_lookup(const char *name)
pmu->name = strdup(name);
pmu->type = type;
pmu->is_uncore = pmu_is_uncore(name);
+ if (pmu->is_uncore)
+ pmu->id = pmu_id(name);
pmu->max_precise = pmu_max_precise(name);
pmu_add_cpu_aliases(&aliases, pmu);
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index a64e9c9ce731..d4366e8e79df 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -30,6 +30,7 @@ struct perf_pmu_caps {
struct perf_pmu {
char *name;
+ char *id;
__u32 type;
bool selectable;
bool is_uncore;
--
2.26.2
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