From 6bf86cada3eb8ec3eb80cdce5280e7a22dac8b01 Mon Sep 17 00:00:00 2001 From: Ganapatrao Kulkarni Date: Thu, 20 Apr 2023 22:52:53 -0700 Subject: [PATCH] perf cs-etm: Add fix for coresight trace for any range of CPUs The current implementation supports coresight trace decode for a range of CPUs, if the first CPU is CPU0. Perf report segfaults, if tried for sparse CPUs list and also for any range of CPUs(non zero first CPU). Adding a fix to perf report for any range of CPUs and for sparse list. Signed-off-by: Ganapatrao Kulkarni Link: https://lore.kernel.org/r/20230421055253.83912-1-gankulkarni@os.amperecomputing.com Cc: suzuki.poulose@arm.com Cc: acme@kernel.org Cc: mathieu.poirier@linaro.org Cc: mike.leach@linaro.org Cc: linux-arm-kernel@lists.infradead.org Cc: darren@os.amperecomputing.com Cc: scclevenger@os.amperecomputing.com Cc: scott@os.amperecomputing.com Cc: linux-kernel@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/cs-etm.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 456994564d6e4..91299cc56bf78 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -290,6 +290,25 @@ static int cs_etm__metadata_set_trace_id(u8 trace_chan_id, u64 *cpu_metadata) (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \ }) +/* + * Get a metadata for a specific cpu from an array. + * + */ +static u64 *get_cpu_data(struct cs_etm_auxtrace *etm, int cpu) +{ + int i; + u64 *metadata = NULL; + + for (i = 0; i < etm->num_cpu; i++) { + if (etm->metadata[i][CS_ETM_CPU] == (u64)cpu) { + metadata = etm->metadata[i]; + break; + } + } + + return metadata; +} + /* * Handle the PERF_RECORD_AUX_OUTPUT_HW_ID event. * @@ -359,8 +378,11 @@ static int cs_etm__process_aux_output_hw_id(struct perf_session *session, return 0; } + cpu_data = get_cpu_data(etm, cpu); + if (cpu_data == NULL) + return err; + /* not one we've seen before - lets map it */ - cpu_data = etm->metadata[cpu]; err = cs_etm__map_trace_id(trace_chan_id, cpu_data); if (err) return err; -- 2.30.2