Commit a347306f authored by Al Grant's avatar Al Grant Committed by Arnaldo Carvalho de Melo

perf intel-pt: Fix corrupt data after perf inject from

Commit 42bbabed ("perf tools: Add hw_idx in struct branch_stack")
changed the format of branch stacks in perf samples. When samples use
this new format, a flag must be set in the corresponding event.

Synthesized branch stacks generated from Intel PT were using the new
format, but not setting the event attribute, leading to consumers
seeing corrupt data. This patch fixes the issue by setting the event
attribute to indicate use of the new format.

Fixes: 42bbabed ("perf tools: Add hw_idx in struct branch_stack")
Signed-off-by: default avatarAl Grant <al.grant@arm.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lore.kernel.org/lkml/20200819084751.17686-2-leo.yan@linaro.orgSigned-off-by: default avatarLeo Yan <leo.yan@linaro.org>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f5f8e7e5
...@@ -3017,8 +3017,15 @@ static int intel_pt_synth_events(struct intel_pt *pt, ...@@ -3017,8 +3017,15 @@ static int intel_pt_synth_events(struct intel_pt *pt,
if (pt->synth_opts.callchain) if (pt->synth_opts.callchain)
attr.sample_type |= PERF_SAMPLE_CALLCHAIN; attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
if (pt->synth_opts.last_branch) if (pt->synth_opts.last_branch) {
attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
/*
* We don't use the hardware index, but the sample generation
* code uses the new format branch_stack with this field,
* so the event attributes must indicate that it's present.
*/
attr.branch_sample_type |= PERF_SAMPLE_BRANCH_HW_INDEX;
}
if (pt->synth_opts.instructions) { if (pt->synth_opts.instructions) {
attr.config = PERF_COUNT_HW_INSTRUCTIONS; attr.config = PERF_COUNT_HW_INSTRUCTIONS;
......
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