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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/arch/x86/util/pmu.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/arch/x86/util/pmu.c')
-rw-r--r-- | tools/perf/arch/x86/util/pmu.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c new file mode 100644 index 0000000000..f428cffb03 --- /dev/null +++ b/tools/perf/arch/x86/util/pmu.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <string.h> +#include <stdio.h> +#include <sys/types.h> +#include <dirent.h> +#include <fcntl.h> +#include <linux/stddef.h> +#include <linux/perf_event.h> +#include <linux/zalloc.h> +#include <api/fs/fs.h> +#include <errno.h> + +#include "../../../util/intel-pt.h" +#include "../../../util/intel-bts.h" +#include "../../../util/pmu.h" +#include "../../../util/fncache.h" +#include "../../../util/pmus.h" +#include "env.h" + +struct pmu_alias { + char *name; + char *alias; + struct list_head list; +}; + +static LIST_HEAD(pmu_alias_name_list); +static bool cached_list; + +struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused) +{ +#ifdef HAVE_AUXTRACE_SUPPORT + if (!strcmp(pmu->name, INTEL_PT_PMU_NAME)) { + pmu->auxtrace = true; + return intel_pt_pmu_default_config(pmu); + } + if (!strcmp(pmu->name, INTEL_BTS_PMU_NAME)) { + pmu->auxtrace = true; + pmu->selectable = true; + } +#endif + return NULL; +} + +static void pmu_alias__delete(struct pmu_alias *pmu_alias) +{ + if (!pmu_alias) + return; + + zfree(&pmu_alias->name); + zfree(&pmu_alias->alias); + free(pmu_alias); +} + +static struct pmu_alias *pmu_alias__new(char *name, char *alias) +{ + struct pmu_alias *pmu_alias = zalloc(sizeof(*pmu_alias)); + + if (pmu_alias) { + pmu_alias->name = strdup(name); + if (!pmu_alias->name) + goto out_delete; + + pmu_alias->alias = strdup(alias); + if (!pmu_alias->alias) + goto out_delete; + } + return pmu_alias; + +out_delete: + pmu_alias__delete(pmu_alias); + return NULL; +} + +static int setup_pmu_alias_list(void) +{ + int fd, dirfd; + DIR *dir; + struct dirent *dent; + struct pmu_alias *pmu_alias; + char buf[MAX_PMU_NAME_LEN]; + FILE *file; + int ret = -ENOMEM; + + dirfd = perf_pmu__event_source_devices_fd(); + if (dirfd < 0) + return -1; + + dir = fdopendir(dirfd); + if (!dir) + return -errno; + + while ((dent = readdir(dir))) { + if (!strcmp(dent->d_name, ".") || + !strcmp(dent->d_name, "..")) + continue; + + fd = perf_pmu__pathname_fd(dirfd, dent->d_name, "alias", O_RDONLY); + if (fd < 0) + continue; + + file = fdopen(fd, "r"); + if (!file) + continue; + + if (!fgets(buf, sizeof(buf), file)) { + fclose(file); + continue; + } + + fclose(file); + + /* Remove the last '\n' */ + buf[strlen(buf) - 1] = 0; + + pmu_alias = pmu_alias__new(dent->d_name, buf); + if (!pmu_alias) + goto close_dir; + + list_add_tail(&pmu_alias->list, &pmu_alias_name_list); + } + + ret = 0; + +close_dir: + closedir(dir); + return ret; +} + +static const char *__pmu_find_real_name(const char *name) +{ + struct pmu_alias *pmu_alias; + + list_for_each_entry(pmu_alias, &pmu_alias_name_list, list) { + if (!strcmp(name, pmu_alias->alias)) + return pmu_alias->name; + } + + return name; +} + +const char *pmu_find_real_name(const char *name) +{ + if (cached_list) + return __pmu_find_real_name(name); + + setup_pmu_alias_list(); + cached_list = true; + + return __pmu_find_real_name(name); +} + +static const char *__pmu_find_alias_name(const char *name) +{ + struct pmu_alias *pmu_alias; + + list_for_each_entry(pmu_alias, &pmu_alias_name_list, list) { + if (!strcmp(name, pmu_alias->name)) + return pmu_alias->alias; + } + return NULL; +} + +const char *pmu_find_alias_name(const char *name) +{ + if (cached_list) + return __pmu_find_alias_name(name); + + setup_pmu_alias_list(); + cached_list = true; + + return __pmu_find_alias_name(name); +} + +int perf_pmus__num_mem_pmus(void) +{ + /* AMD uses IBS OP pmu and not a core PMU for perf mem/c2c */ + if (x86__is_amd_cpu()) + return 1; + + /* Intel uses core pmus for perf mem/c2c */ + return perf_pmus__num_core_pmus(); +} |