From: German Gomez german.gomez@arm.com
mainline inclusion from mainline-v5.16-rc2 commit 9e1a8d9f6832 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4NGPV CVE: NA
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'perf inject' is currently not working for Arm SPE. When you try to run 'perf inject' and 'perf report' with a perf.data file that contains SPE traces, the tool reports a "Bad address" error:
# ./perf record -e arm_spe_0/ts_enable=1,store_filter=1,branch_filter=1,load_filter=1/ -a -- sleep 1 # ./perf inject -i perf.data -o perf.inject.data --itrace # ./perf report -i perf.inject.data --stdio
0x42c00 [0x8]: failed to process type: 9 [Bad address] Error: failed to process sample
As far as I know, the issue was first spotted in [1], but 'perf inject' was not yet injecting the samples. This patch does something similar to what cs_etm does for injecting the samples [2], but for SPE.
[1] https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210412091006.4... [2] https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/pe...
Reviewed-by: James Clark james.clark@arm.com Signed-off-by: German Gomez german.gomez@arm.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: John Garry john.garry@huawei.com Cc: Leo Yan leo.yan@linaro.org Cc: Mark Rutland mark.rutland@arm.com Cc: Mathieu Poirier mathieu.poirier@linaro.org Cc: Namhyung Kim namhyung@kernel.org Cc: Will Deacon will@kernel.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20211105104130.28186-2-german.gomez@arm.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Wei Li liwei391@huawei.com Reviewed-by: Yang Jihong yangjihong1@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- tools/perf/util/arm-spe.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c index 4748bcfe61de..fccac06b573a 100644 --- a/tools/perf/util/arm-spe.c +++ b/tools/perf/util/arm-spe.c @@ -51,6 +51,7 @@ struct arm_spe { u8 timeless_decoding; u8 data_queued;
+ u64 sample_type; u8 sample_flc; u8 sample_llc; u8 sample_tlb; @@ -287,6 +288,12 @@ static void arm_spe_prep_sample(struct arm_spe *spe, event->sample.header.size = sizeof(struct perf_event_header); }
+static int arm_spe__inject_event(union perf_event *event, struct perf_sample *sample, u64 type) +{ + event->header.size = perf_event__sample_event_size(sample, type, 0); + return perf_event__synthesize_sample(event, type, 0, sample); +} + static inline int arm_spe_deliver_synth_event(struct arm_spe *spe, struct arm_spe_queue *speq __maybe_unused, @@ -295,6 +302,12 @@ arm_spe_deliver_synth_event(struct arm_spe *spe, { int ret;
+ if (spe->synth_opts.inject) { + ret = arm_spe__inject_event(event, sample, spe->sample_type); + if (ret) + return ret; + } + ret = perf_session__deliver_synth_event(spe->session, event, sample); if (ret) pr_err("ARM SPE: failed to deliver event, error %d\n", ret); @@ -986,6 +999,8 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session) else attr.sample_type |= PERF_SAMPLE_TIME;
+ spe->sample_type = attr.sample_type; + attr.exclude_user = evsel->core.attr.exclude_user; attr.exclude_kernel = evsel->core.attr.exclude_kernel; attr.exclude_hv = evsel->core.attr.exclude_hv;