From: James Clark <james.clark@arm.com>
To: linux-perf-users@vger.kernel.org, tanmay@marvell.com,
leo.yan@linaro.org, mike.leach@linaro.org
Cc: sgoutham@marvell.com, gcherian@marvell.com, lcherian@marvell.com,
bbhushan2@marvell.com, German Gomez <german.gomez@arm.com>,
James Clark <james.clark@arm.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
John Garry <john.g.garry@oracle.com>,
Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v5 6/8] perf cs_etm: Record ts_source in AUXTRACE_INFO for ETMv4 and ETE
Date: Fri, 20 Jan 2023 14:36:59 +0000 [thread overview]
Message-ID: <20230120143702.4035046-7-james.clark@arm.com> (raw)
In-Reply-To: <20230120143702.4035046-1-james.clark@arm.com>
From: German Gomez <german.gomez@arm.com>
Read the value of ts_source exposed by the driver and store it in the
ETMv4 and ETE header. If the interface doesn't exist (such as in older
Kernels), defaults to a safe value of -1.
Signed-off-by: German Gomez <german.gomez@arm.com>
Signed-off-by: James Clark <james.clark@arm.com>
---
tools/perf/arch/arm/util/cs-etm.c | 48 +++++++++++++++++++++++++++++++
tools/perf/util/cs-etm-base.c | 2 ++
tools/perf/util/cs-etm.h | 2 ++
3 files changed, 52 insertions(+)
diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index b526ffe550a5..481e170cd3f1 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -53,6 +53,7 @@ static const char * const metadata_etmv4_ro[] = {
[CS_ETMV4_TRCIDR2] = "trcidr/trcidr2",
[CS_ETMV4_TRCIDR8] = "trcidr/trcidr8",
[CS_ETMV4_TRCAUTHSTATUS] = "mgmt/trcauthstatus",
+ [CS_ETMV4_TS_SOURCE] = "ts_source",
};
static const char * const metadata_ete_ro[] = {
@@ -62,6 +63,7 @@ static const char * const metadata_ete_ro[] = {
[CS_ETE_TRCIDR8] = "trcidr/trcidr8",
[CS_ETE_TRCAUTHSTATUS] = "mgmt/trcauthstatus",
[CS_ETE_TRCDEVARCH] = "mgmt/trcdevarch",
+ [CS_ETE_TS_SOURCE] = "ts_source",
};
static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu);
@@ -613,6 +615,32 @@ static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
return val;
}
+static int cs_etm_get_ro_signed(struct perf_pmu *pmu, int cpu, const char *path)
+{
+ char pmu_path[PATH_MAX];
+ int scan;
+ int val = 0;
+
+ /* Get RO metadata from sysfs */
+ snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path);
+
+ scan = perf_pmu__scan_file(pmu, pmu_path, "%d", &val);
+ if (scan != 1)
+ pr_err("%s: error reading: %s\n", __func__, pmu_path);
+
+ return val;
+}
+
+static bool cs_etm_pmu_path_exists(struct perf_pmu *pmu, int cpu, const char *path)
+{
+ char pmu_path[PATH_MAX];
+
+ /* Get RO metadata from sysfs */
+ snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path);
+
+ return perf_pmu__file_exists(pmu, pmu_path);
+}
+
#define TRCDEVARCH_ARCHPART_SHIFT 0
#define TRCDEVARCH_ARCHPART_MASK GENMASK(11, 0)
#define TRCDEVARCH_ARCHPART(x) (((x) & TRCDEVARCH_ARCHPART_MASK) >> TRCDEVARCH_ARCHPART_SHIFT)
@@ -654,6 +682,16 @@ static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr,
metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu,
metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]);
+
+ /* Kernels older than 5.19 may not expose ts_source */
+ if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TS_SOURCE]))
+ data[CS_ETMV4_TS_SOURCE] = (__u64) cs_etm_get_ro_signed(cs_etm_pmu, cpu,
+ metadata_etmv4_ro[CS_ETMV4_TS_SOURCE]);
+ else {
+ pr_warning("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n",
+ cpu);
+ data[CS_ETMV4_TS_SOURCE] = (__u64) -1;
+ }
}
static void cs_etm_save_ete_header(__u64 data[], struct auxtrace_record *itr, int cpu)
@@ -679,6 +717,16 @@ static void cs_etm_save_ete_header(__u64 data[], struct auxtrace_record *itr, in
/* ETE uses the same registers as ETMv4 plus TRCDEVARCH */
data[CS_ETE_TRCDEVARCH] = cs_etm_get_ro(cs_etm_pmu, cpu,
metadata_ete_ro[CS_ETE_TRCDEVARCH]);
+
+ /* Kernels older than 5.19 may not expose ts_source */
+ if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TS_SOURCE]))
+ data[CS_ETE_TS_SOURCE] = (__u64) cs_etm_get_ro_signed(cs_etm_pmu, cpu,
+ metadata_ete_ro[CS_ETE_TS_SOURCE]);
+ else {
+ pr_warning("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n",
+ cpu);
+ data[CS_ETE_TS_SOURCE] = (__u64) -1;
+ }
}
static void cs_etm_get_metadata(int cpu, u32 *offset,
diff --git a/tools/perf/util/cs-etm-base.c b/tools/perf/util/cs-etm-base.c
index 282042c6e944..5f48b756c4cf 100644
--- a/tools/perf/util/cs-etm-base.c
+++ b/tools/perf/util/cs-etm-base.c
@@ -36,6 +36,7 @@ static const char * const cs_etmv4_priv_fmts[] = {
[CS_ETMV4_TRCIDR2] = " TRCIDR2 %llx\n",
[CS_ETMV4_TRCIDR8] = " TRCIDR8 %llx\n",
[CS_ETMV4_TRCAUTHSTATUS] = " TRCAUTHSTATUS %llx\n",
+ [CS_ETMV4_TS_SOURCE] = " TS_SOURCE %lld\n",
};
static const char * const cs_ete_priv_fmts[] = {
@@ -50,6 +51,7 @@ static const char * const cs_ete_priv_fmts[] = {
[CS_ETE_TRCIDR8] = " TRCIDR8 %llx\n",
[CS_ETE_TRCAUTHSTATUS] = " TRCAUTHSTATUS %llx\n",
[CS_ETE_TRCDEVARCH] = " TRCDEVARCH %llx\n",
+ [CS_ETE_TS_SOURCE] = " TS_SOURCE %lld\n",
};
static const char * const param_unk_fmt =
diff --git a/tools/perf/util/cs-etm.h b/tools/perf/util/cs-etm.h
index c5925428afa9..ad790930bcbc 100644
--- a/tools/perf/util/cs-etm.h
+++ b/tools/perf/util/cs-etm.h
@@ -71,6 +71,7 @@ enum {
CS_ETMV4_TRCIDR2,
CS_ETMV4_TRCIDR8,
CS_ETMV4_TRCAUTHSTATUS,
+ CS_ETMV4_TS_SOURCE,
CS_ETMV4_PRIV_MAX,
};
@@ -92,6 +93,7 @@ enum {
CS_ETE_TRCIDR8,
CS_ETE_TRCAUTHSTATUS,
CS_ETE_TRCDEVARCH,
+ CS_ETE_TS_SOURCE,
CS_ETE_PRIV_MAX
};
--
2.25.1
next prev parent reply other threads:[~2023-01-20 14:41 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-20 14:36 [PATCH v5 0/8] perf cs_etm: Basic support for virtual/kernel timestamps James Clark
2023-01-20 14:36 ` [PATCH v5 1/8] perf: Remove duplication around EVENT_SOURCE_DEVICE_PATH James Clark
2023-01-20 14:36 ` [PATCH v5 2/8] perf: Use perf_pmu__open_file() and perf_pmu__scan_file() James Clark
2023-01-20 17:21 ` Arnaldo Carvalho de Melo
2023-01-20 17:32 ` Arnaldo Carvalho de Melo
2023-01-20 17:43 ` Arnaldo Carvalho de Melo
2023-01-23 10:36 ` James Clark
2023-01-20 14:36 ` [PATCH v5 3/8] perf: Remove remaining duplication of bus/event_source/devices/ James Clark
2023-01-20 14:36 ` [PATCH v5 4/8] perf pmu: Add function to check if a pmu file exists James Clark
2023-01-20 14:36 ` [PATCH v5 5/8] perf cs_etm: Keep separate symbols for ETMv4 and ETE parameters James Clark
2023-01-20 14:36 ` James Clark [this message]
2023-01-20 14:37 ` [PATCH v5 7/8] perf cs_etm: Set the time field in the synthetic samples James Clark
2023-01-20 14:37 ` [PATCH v5 8/8] perf: cs-etm: Ensure that Coresight timestamps don't go backwards James Clark
2023-01-20 17:12 ` Arnaldo Carvalho de Melo
2023-01-23 10:37 ` James Clark
2023-01-20 14:42 ` [PATCH v5 0/8] perf cs_etm: Basic support for virtual/kernel timestamps Suzuki K Poulose
2023-01-20 17:44 ` Tanmay Jagdale
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