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perf cs-etm: Configure timestamp generation in CPU-wide mode

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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>
Tested-by: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190524173508.29044-3-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Mathieu Poirier 2019-05-24 11:34:53 -06:00 committed by Arnaldo Carvalho de Melo
parent 3399ad9ac2
commit 1c839a5a40
1 changed files with 57 additions and 0 deletions
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57
tools/perf/arch/arm/util/cs-etm.c
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@ -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 */