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c5a26ea490
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: Jin Yao <yao.jin@linux.intel.com> Reviewed-by: Jiri 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: Arnaldo Carvalho de Melo <acme@redhat.com>
90 lines
1.5 KiB
C
90 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/list.h>
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#include <linux/compiler.h>
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#include <linux/string.h>
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#include <linux/zalloc.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdarg.h>
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#include <locale.h>
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#include <api/fs/fs.h>
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#include "fncache.h"
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#include "pmu-hybrid.h"
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LIST_HEAD(perf_pmu__hybrid_pmus);
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bool perf_pmu__hybrid_mounted(const char *name)
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{
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char path[PATH_MAX];
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const char *sysfs;
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FILE *file;
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int n, cpu;
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if (strncmp(name, "cpu_", 4))
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return false;
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sysfs = sysfs__mountpoint();
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if (!sysfs)
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return false;
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snprintf(path, PATH_MAX, CPUS_TEMPLATE_CPU, sysfs, name);
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if (!file_available(path))
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return false;
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file = fopen(path, "r");
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if (!file)
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return false;
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n = fscanf(file, "%u", &cpu);
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fclose(file);
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if (n <= 0)
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return false;
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return true;
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}
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struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)
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{
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struct perf_pmu *pmu;
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if (!name)
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return NULL;
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perf_pmu__for_each_hybrid_pmu(pmu) {
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if (!strcmp(name, pmu->name))
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return pmu;
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}
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return NULL;
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}
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bool perf_pmu__is_hybrid(const char *name)
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{
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return perf_pmu__find_hybrid_pmu(name) != NULL;
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}
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char *perf_pmu__hybrid_type_to_pmu(const char *type)
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{
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char *pmu_name = NULL;
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if (asprintf(&pmu_name, "cpu_%s", type) < 0)
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return NULL;
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if (perf_pmu__is_hybrid(pmu_name))
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return pmu_name;
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/*
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* pmu may be not scanned, check the sysfs.
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*/
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if (perf_pmu__hybrid_mounted(pmu_name))
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return pmu_name;
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free(pmu_name);
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return NULL;
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}
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