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From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>,
	Nageswara R Sastry <nasastry@in.ibm.com>,
	Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
	Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 4/8] perf tools: Read and store caps/max_precise in perf_pmu
Date: Tue,  5 Mar 2019 16:25:32 +0100
Message-ID: <20190305152536.21035-5-jolsa@kernel.org> (raw)
In-Reply-To: <20190305152536.21035-1-jolsa@kernel.org>

Read the caps/max_precise value and store it in struct
perf_pmu to be used when setting the maximum precise_ip
field in following patch.

Link: http://lkml.kernel.org/n/tip-y47h37fzs5t8hy9t0j5g9pyj@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/pmu.c | 14 ++++++++++++++
 tools/perf/util/pmu.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 51d437f55d18..6199a3174ab9 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -752,6 +752,19 @@ perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 	return NULL;
 }
 
+static int pmu_max_precise(const char *name)
+{
+	char path[PATH_MAX];
+	int max_precise = -1;
+
+	scnprintf(path, PATH_MAX,
+		 "bus/event_source/devices/%s/caps/max_precise",
+		 name);
+
+	sysfs__read_int(path, &max_precise);
+	return max_precise;
+}
+
 static struct perf_pmu *pmu_lookup(const char *name)
 {
 	struct perf_pmu *pmu;
@@ -784,6 +797,7 @@ static struct perf_pmu *pmu_lookup(const char *name)
 	pmu->name = strdup(name);
 	pmu->type = type;
 	pmu->is_uncore = pmu_is_uncore(name);
+	pmu->max_precise = pmu_max_precise(name);
 	pmu_add_cpu_aliases(&aliases, pmu);
 
 	INIT_LIST_HEAD(&pmu->format);
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 47253c3daf55..bd9ec2704a57 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -26,6 +26,7 @@ struct perf_pmu {
 	__u32 type;
 	bool selectable;
 	bool is_uncore;
+	int max_precise;
 	struct perf_event_attr *default_config;
 	struct cpu_map *cpus;
 	struct list_head format;  /* HEAD struct perf_pmu_format -> list */
-- 
2.17.2


  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-05 15:25 [PATCH 0/8] perf tools: Assorted fixes Jiri Olsa
2019-03-05 15:25 ` [PATCH 1/8] perf c2c: Fix c2c report for empty numa node Jiri Olsa
2019-03-09 20:05   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 2/8] perf tools: Add error path into hist_entry__init Jiri Olsa
2019-03-09 20:06   ` [tip:perf/urgent] perf hist: " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 3/8] perf hist: Fix memory leak of srcline Jiri Olsa
2019-03-09 20:07   ` [tip:perf/urgent] " tip-bot for Jiri Olsa
2019-03-05 15:25 ` Jiri Olsa [this message]
2019-03-09 20:07   ` [tip:perf/urgent] perf tools: Read and store caps/max_precise in perf_pmu tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 5/8] perf tools: Get precise_ip from the pmu config Jiri Olsa
2019-03-05 16:13   ` Andi Kleen
2019-03-05 16:28     ` Jiri Olsa
2019-03-05 16:40       ` Andi Kleen
2019-03-07 15:35         ` [PATCHv2 " Jiri Olsa
2019-03-07 16:51           ` Andi Kleen
2019-03-07 22:32             ` Jiri Olsa
2019-03-14 14:01             ` Jiri Olsa
2019-03-14 15:49               ` Andi Kleen
2019-03-15 12:15                 ` [PATCH] perf tools: Move precise_ip detection into perf_evsel__open Jiri Olsa
2019-03-15 14:05                   ` Andi Kleen
2019-03-15 14:35                   ` Arnaldo Carvalho de Melo
2019-03-15 14:52                     ` Jiri Olsa
2019-03-23 15:04                       ` Jiri Olsa
2019-03-25 14:53                         ` Arnaldo Carvalho de Melo
2019-03-05 15:25 ` [PATCH 6/8] perf tools: Probe for precise_ip with simple attr Jiri Olsa
2019-03-09 20:08   ` [tip:perf/urgent] perf evsel: " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 7/8] perf tools: Fix double free in perf_data__close Jiri Olsa
2019-03-09 20:09   ` [tip:perf/urgent] perf session: " tip-bot for Jiri Olsa
2019-03-05 15:25 ` [PATCH 8/8] perf tools: Force perf_data__open|close zero data->file.path Jiri Olsa
2019-03-09 20:09   ` [tip:perf/urgent] perf data: " tip-bot for Jiri Olsa

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