From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: acme@kernel.org
Cc: peterz@infradead.org, mingo@redhat.com,
alexander.shishkin@linux.intel.com, jolsa@redhat.com,
namhyung@kernel.org, suzuki.poulose@arm.com, leo.yan@linaro.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org
Subject: [PATCH v2 02/17] perf tools: Configure timestsamp generation in CPU-wide mode
Date: Fri, 24 May 2019 11:34:53 -0600 [thread overview]
Message-ID: <20190524173508.29044-3-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <20190524173508.29044-1-mathieu.poirier@linaro.org>
When operating in CPU-wide mode tracers need to generate timestamps in
order to correlate the code being traced on one CPU with what is executed
on other CPUs.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
tools/perf/arch/arm/util/cs-etm.c | 57 +++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index 3912f0bf04ed..be1e4f20affa 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -99,6 +99,54 @@ static int cs_etm_set_context_id(struct auxtrace_record *itr,
return err;
}
+static int cs_etm_set_timestamp(struct auxtrace_record *itr,
+ struct perf_evsel *evsel, int cpu)
+{
+ struct cs_etm_recording *ptr;
+ struct perf_pmu *cs_etm_pmu;
+ char path[PATH_MAX];
+ int err = -EINVAL;
+ u32 val;
+
+ ptr = container_of(itr, struct cs_etm_recording, itr);
+ cs_etm_pmu = ptr->cs_etm_pmu;
+
+ if (!cs_etm_is_etmv4(itr, cpu))
+ goto out;
+
+ /* Get a handle on TRCIRD0 */
+ snprintf(path, PATH_MAX, "cpu%d/%s",
+ cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
+ err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
+
+ /* There was a problem reading the file, bailing out */
+ if (err != 1) {
+ pr_err("%s: can't read file %s\n",
+ CORESIGHT_ETM_PMU_NAME, path);
+ goto out;
+ }
+
+ /*
+ * TRCIDR0.TSSIZE, bit [28-24], indicates whether global timestamping
+ * is supported:
+ * 0b00000 Global timestamping is not implemented
+ * 0b00110 Implementation supports a maximum timestamp of 48bits.
+ * 0b01000 Implementation supports a maximum timestamp of 64bits.
+ */
+ val &= GENMASK(28, 24);
+ if (!val) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* All good, let the kernel know */
+ evsel->attr.config |= (1 << ETM_OPT_TS);
+ err = 0;
+
+out:
+ return err;
+}
+
static int cs_etm_set_option(struct auxtrace_record *itr,
struct perf_evsel *evsel, u32 option)
{
@@ -118,6 +166,11 @@ static int cs_etm_set_option(struct auxtrace_record *itr,
if (err)
goto out;
break;
+ case ETM_OPT_TS:
+ err = cs_etm_set_timestamp(itr, evsel, i);
+ if (err)
+ goto out;
+ break;
default:
goto out;
}
@@ -343,6 +396,10 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
err = cs_etm_set_option(itr, cs_etm_evsel, ETM_OPT_CTXTID);
if (err)
goto out;
+
+ err = cs_etm_set_option(itr, cs_etm_evsel, ETM_OPT_TS);
+ if (err)
+ goto out;
}
/* Add dummy event to keep tracking */
--
2.17.1
next prev parent reply other threads:[~2019-05-24 17:35 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-24 17:34 [PATCH v2 00/17] perf tools: Coresight: Add CPU-wide trace support Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 01/17] perf tools: Configure contextID tracing in CPU-wide mode Mathieu Poirier
2019-06-07 9:21 ` Suzuki K Poulose
2019-06-07 17:40 ` Mathieu Poirier
2019-06-07 18:20 ` Arnaldo Carvalho de Melo
2019-06-07 19:33 ` Mathieu Poirier
2019-06-17 19:36 ` [tip:perf/core] perf cs-etm: Remove duplicate GENMASK() define, use linux/bits.h instead tip-bot for Arnaldo Carvalho de Melo
2019-06-17 19:20 ` [tip:perf/core] perf cs-etm: Configure contextID tracing in CPU-wide mode tip-bot for Mathieu Poirier
2019-05-24 17:34 ` Mathieu Poirier [this message]
2019-06-07 9:41 ` [PATCH v2 02/17] perf tools: Configure timestsamp generation " Suzuki K Poulose
2019-06-07 17:46 ` Mathieu Poirier
2019-06-07 18:34 ` Arnaldo Carvalho de Melo
2019-06-17 19:20 ` [tip:perf/core] perf cs-etm: Configure timestamp " tip-bot for Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 03/17] perf tools: Configure SWITCH_EVENTS " Mathieu Poirier
2019-06-17 19:21 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 04/17] perf tools: Add handling of itrace start events Mathieu Poirier
2019-06-17 19:22 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 05/17] perf tools: Add handling of switch-CPU-wide events Mathieu Poirier
2019-06-17 19:22 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 06/17] perf tools: Refactor error path in cs_etm_decoder__new() Mathieu Poirier
2019-06-17 19:23 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 07/17] perf tools: Move packet queue out of decoder structure Mathieu Poirier
2019-06-17 19:24 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:34 ` [PATCH v2 08/17] perf tools: Fix indentation in function cs_etm__process_decoder_queue() Mathieu Poirier
2019-06-17 19:25 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 09/17] perf tools: Introduce the concept of trace ID queues Mathieu Poirier
2019-06-17 19:25 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 10/17] perf tools: Get rid of unused cpu in struct cs_etm_queue Mathieu Poirier
2019-06-17 19:26 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 11/17] perf tools: Move thread to traceid_queue Mathieu Poirier
2019-06-17 19:27 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 12/17] perf tools: Move tid/pid " Mathieu Poirier
2019-06-17 19:27 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 13/17] perf tools: Use traceID aware memory callback API Mathieu Poirier
2019-06-17 19:28 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 14/17] perf tools: Add support for multiple traceID queues Mathieu Poirier
2019-06-17 19:29 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 15/17] perf tools: Linking PE contextID with perf thread mechanic Mathieu Poirier
2019-06-17 19:29 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 16/17] perf tools: Add notion of time to decoding code Mathieu Poirier
2019-06-06 18:50 ` Arnaldo Carvalho de Melo
2019-06-07 14:38 ` Mathieu Poirier
2019-06-17 19:30 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-24 17:35 ` [PATCH v2 17/17] perf tools: Add support for CPU-wide trace scenarios Mathieu Poirier
2019-06-17 19:31 ` [tip:perf/core] perf cs-etm: " tip-bot for Mathieu Poirier
2019-05-31 1:45 ` [PATCH v2 00/17] perf tools: Coresight: Add CPU-wide trace support Leo Yan
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