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perf pmus: Factor perf_pmus__find_by_attr out of evsel__find_pmu

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Allow a PMU to be found by a perf_event_attr, useful when creating
evsels.

Reviewed-by: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250719030517.1990983-10-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers 2025-07-18 20:05:11 -07:00 • committed by Namhyung Kim
parent f958537f18
commit 3cb614a261
2 changed files with 19 additions and 12 deletions
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29
tools/perf/util/pmus.c
View file

@ -814,24 +814,18 @@ bool perf_pmus__supports_extended_type(void)
return perf_pmus__do_support_extended_type;
}
struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
struct perf_pmu *perf_pmus__find_by_attr(const struct perf_event_attr *attr)
{
struct perf_pmu *pmu = evsel->pmu;
bool legacy_core_type;
struct perf_pmu *pmu = perf_pmus__find_by_type(attr->type);
u32 type = attr->type;
bool legacy_core_type = type == PERF_TYPE_HARDWARE || type == PERF_TYPE_HW_CACHE;
if (pmu)
return pmu;
pmu = perf_pmus__find_by_type(evsel->core.attr.type);
legacy_core_type =
evsel->core.attr.type == PERF_TYPE_HARDWARE ||
evsel->core.attr.type == PERF_TYPE_HW_CACHE;
if (!pmu && legacy_core_type && perf_pmus__supports_extended_type()) {
u32 type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT;
type = attr->config >> PERF_PMU_TYPE_SHIFT;
pmu = perf_pmus__find_by_type(type);
}
if (!pmu && (legacy_core_type || evsel->core.attr.type == PERF_TYPE_RAW)) {
if (!pmu && (legacy_core_type || type == PERF_TYPE_RAW)) {
/*
* For legacy events, if there was no extended type info then
* assume the PMU is the first core PMU.
@ -842,6 +836,17 @@ struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
*/
pmu = perf_pmus__find_core_pmu();
}
return pmu;
}
struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
{
struct perf_pmu *pmu = evsel->pmu;
if (pmu)
return pmu;
pmu = perf_pmus__find_by_attr(&evsel->core.attr);
((struct evsel *)evsel)->pmu = pmu;
return pmu;
}

2
tools/perf/util/pmus.h
View file

@ -5,6 +5,7 @@
#include <stdbool.h>
#include <stddef.h>
struct perf_event_attr;
struct perf_pmu;
struct print_callbacks;
@ -16,6 +17,7 @@ void perf_pmus__destroy(void);
struct perf_pmu *perf_pmus__find(const char *name);
struct perf_pmu *perf_pmus__find_by_type(unsigned int type);
struct perf_pmu *perf_pmus__find_by_attr(const struct perf_event_attr *attr);
struct perf_pmu *perf_pmus__scan(struct perf_pmu *pmu);
struct perf_pmu *perf_pmus__scan_core(struct perf_pmu *pmu);