Commit c5a26ea4 authored by Jin Yao's avatar Jin Yao Committed by Arnaldo Carvalho de Melo
Browse files

perf pmu: Add hybrid helper functions 



The functions perf_pmu__is_hybrid and perf_pmu__find_hybrid_pmu
can be used to identify the hybrid platform and return the found
hybrid cpu pmu. All the detected hybrid pmus have been saved in
'perf_pmu__hybrid_pmus' list. So we just need to search this list.

perf_pmu__hybrid_type_to_pmu converts the user specified string
to hybrid pmu name. This is used to support the '--cputype' option
in next patches.

perf_pmu__has_hybrid checks the existing of hybrid pmu. Note that,
we have to define it in pmu.c (make pmu-hybrid.c no more symbol
dependency), otherwise perf test python would be failed.

Signed-off-by: default avatarJin Yao <yao.jin@linux.intel.com>
Reviewed-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210427070139.25256-7-yao.jin@linux.intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 44462430

tools/perf/util/pmu-hybrid.c

+40 −0
Original line number Diff line number Diff line
@@ -47,3 +47,43 @@ bool perf_pmu__hybrid_mounted(const char *name) 


	return true;

}



struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)

{

	struct perf_pmu *pmu;



	if (!name)

		return NULL;



	perf_pmu__for_each_hybrid_pmu(pmu) {

		if (!strcmp(name, pmu->name))

			return pmu;

	}



	return NULL;

}



bool perf_pmu__is_hybrid(const char *name)

{

	return perf_pmu__find_hybrid_pmu(name) != NULL;

}



char *perf_pmu__hybrid_type_to_pmu(const char *type)

{

	char *pmu_name = NULL;



	if (asprintf(&pmu_name, "cpu_%s", type) < 0)

		return NULL;



	if (perf_pmu__is_hybrid(pmu_name))

		return pmu_name;



	/*

	 * pmu may be not scanned, check the sysfs.

	 */

	if (perf_pmu__hybrid_mounted(pmu_name))

		return pmu_name;



	free(pmu_name);

	return NULL;

}

tools/perf/util/pmu-hybrid.h

+4 −0
Original line number Diff line number Diff line
@@ -15,4 +15,8 @@ extern struct list_head perf_pmu__hybrid_pmus; 


bool perf_pmu__hybrid_mounted(const char *name);



struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name);

bool perf_pmu__is_hybrid(const char *name);

char *perf_pmu__hybrid_type_to_pmu(const char *type);



#endif /* __PMU_HYBRID_H */

tools/perf/util/pmu.c

+11 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ int perf_pmu_parse(struct list_head *list, char *name); 
extern FILE *perf_pmu_in;



static LIST_HEAD(pmus);

static bool hybrid_scanned;



/*

 * Parse & process all the sysfs attributes located under
@@ -1861,3 +1862,13 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config, 
		   "'%llx' not supported by kernel)!\n",

		   name ?: "N/A", buf, config);

}



bool perf_pmu__has_hybrid(void)

{

	if (!hybrid_scanned) {

		hybrid_scanned = true;

		perf_pmu__scan(NULL);

	}



	return !list_empty(&perf_pmu__hybrid_pmus);

}

tools/perf/util/pmu.h

+2 −0
Original line number Diff line number Diff line
@@ -132,4 +132,6 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu); 
void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,

				   char *name);



bool perf_pmu__has_hybrid(void);



#endif /* __PMU_H */