linux-kernel - [PATCH v2 2/7] perf arm-spe: Store TSC parameters in auxtrace info

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Message-Id: <20210403072346.30430-3-leo.yan@linaro.org>
Date:   Sat,  3 Apr 2021 15:23:41 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        James Clark <james.clark@....com>, Al Grant <Al.Grant@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v2 2/7] perf arm-spe: Store TSC parameters in auxtrace info

The TSC parameters are used for conversion between arch timer counter
and kernel timestamp, this patch stores the parameters into the struct
perf_record_auxtrace_info, and it is saved in perf data file.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 tools/perf/arch/arm64/util/arm-spe.c | 23 +++++++++++++++++++++++
 tools/perf/util/arm-spe.h            |  6 ++++++
 2 files changed, 29 insertions(+)

diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
index 414c8a5584b1..dd940cf16f49 100644
--- a/tools/perf/arch/arm64/util/arm-spe.c
+++ b/tools/perf/arch/arm64/util/arm-spe.c
@@ -15,7 +15,9 @@
 #include "../../../util/event.h"
 #include "../../../util/evsel.h"
 #include "../../../util/evlist.h"
+#include "../../../util/mmap.h"
 #include "../../../util/session.h"
+#include "../../../util/tsc.h"
 #include <internal/lib.h> // page_size
 #include "../../../util/pmu.h"
 #include "../../../util/debug.h"
@@ -47,6 +49,9 @@ static int arm_spe_info_fill(struct auxtrace_record *itr,
 	struct arm_spe_recording *sper =
 			container_of(itr, struct arm_spe_recording, itr);
 	struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
+	struct perf_event_mmap_page *pc;
+	struct perf_tsc_conversion tc = { .time_mult = 0, };
+	int err;
 
 	if (priv_size != ARM_SPE_AUXTRACE_PRIV_SIZE)
 		return -EINVAL;
@@ -54,8 +59,26 @@ static int arm_spe_info_fill(struct auxtrace_record *itr,
 	if (!session->evlist->core.nr_mmaps)
 		return -EINVAL;
 
+	pc = session->evlist->mmap[0].core.base;
+	if (pc) {
+		err = perf_read_tsc_conversion(pc, &tc);
+		if (err) {
+			if (err != -EOPNOTSUPP)
+				return err;
+		}
+
+		if (!tc.time_mult)
+			ui__warning("Arm SPE: arch timer not available\n");
+	}
+
 	auxtrace_info->type = PERF_AUXTRACE_ARM_SPE;
 	auxtrace_info->priv[ARM_SPE_PMU_TYPE] = arm_spe_pmu->type;
+	auxtrace_info->priv[ARM_SPE_TIME_SHIFT] = tc.time_shift;
+	auxtrace_info->priv[ARM_SPE_TIME_MULT] = tc.time_mult;
+	auxtrace_info->priv[ARM_SPE_TIME_ZERO] = tc.time_zero;
+	auxtrace_info->priv[ARM_SPE_TIME_CYCLES] = tc.time_cycles;
+	auxtrace_info->priv[ARM_SPE_TIME_MASK] = tc.time_mask;
+	auxtrace_info->priv[ARM_SPE_CAP_USER_TIME_SHORT] = tc.cap_user_time_short;
 
 	return 0;
 }
diff --git a/tools/perf/util/arm-spe.h b/tools/perf/util/arm-spe.h
index 105ce0ea0a01..5bf3e838d226 100644
--- a/tools/perf/util/arm-spe.h
+++ b/tools/perf/util/arm-spe.h
@@ -11,6 +11,12 @@
 
 enum {
 	ARM_SPE_PMU_TYPE,
+	ARM_SPE_TIME_SHIFT,
+	ARM_SPE_TIME_MULT,
+	ARM_SPE_TIME_ZERO,
+	ARM_SPE_TIME_CYCLES,
+	ARM_SPE_TIME_MASK,
+	ARM_SPE_CAP_USER_TIME_SHORT,
 	ARM_SPE_AUXTRACE_PRIV_MAX,
 };
 
-- 
2.25.1