diff options
| -rw-r--r-- | tools/perf/util/header.c | 78 | ||||
| -rw-r--r-- | tools/perf/util/header.h | 1 | ||||
| -rw-r--r-- | tools/perf/util/pmu.c | 50 | ||||
| -rw-r--r-- | tools/perf/util/pmu.h | 2 |
4 files changed, 129 insertions, 2 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 69374deeb4a8..63aad3109e34 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -20,6 +20,7 @@ #include "symbol.h" #include "debug.h" #include "cpumap.h" +#include "pmu.h" static bool no_buildid_cache = false; @@ -1004,6 +1005,45 @@ done: } /* + * File format: + * + * struct pmu_mappings { + * u32 pmu_num; + * struct pmu_map { + * u32 type; + * char name[]; + * }[pmu_num]; + * }; + */ + +static int write_pmu_mappings(int fd, struct perf_header *h __used, + struct perf_evlist *evlist __used) +{ + struct perf_pmu *pmu = NULL; + off_t offset = lseek(fd, 0, SEEK_CUR); + __u32 pmu_num = 0; + + /* write real pmu_num later */ + do_write(fd, &pmu_num, sizeof(pmu_num)); + + while ((pmu = perf_pmu__scan(pmu))) { + if (!pmu->name) + continue; + pmu_num++; + do_write(fd, &pmu->type, sizeof(pmu->type)); + do_write_string(fd, pmu->name); + } + + if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) { + /* discard all */ + lseek(fd, offset, SEEK_SET); + return -1; + } + + return 0; +} + +/* * default get_cpuid(): nothing gets recorded * actual implementation must be in arch/$(ARCH)/util/header.c */ @@ -1389,6 +1429,43 @@ static void print_branch_stack(struct perf_header *ph __used, int fd __used, fprintf(fp, "# contains samples with branch stack\n"); } +static void print_pmu_mappings(struct perf_header *ph, int fd, FILE *fp) +{ + const char *delimiter = "# pmu mappings: "; + char *name; + int ret; + u32 pmu_num; + u32 type; + + ret = read(fd, &pmu_num, sizeof(pmu_num)); + if (ret != sizeof(pmu_num)) + goto error; + + if (!pmu_num) { + fprintf(fp, "# pmu mappings: not available\n"); + return; + } + + while (pmu_num) { + if (read(fd, &type, sizeof(type)) != sizeof(type)) + break; + name = do_read_string(fd, ph); + if (!name) + break; + pmu_num--; + fprintf(fp, "%s%s = %" PRIu32, delimiter, name, type); + free(name); + delimiter = ", "; + } + + fprintf(fp, "\n"); + + if (!pmu_num) + return; +error: + fprintf(fp, "# pmu mappings: unable to read\n"); +} + static int __event_process_build_id(struct build_id_event *bev, char *filename, struct perf_session *session) @@ -1644,6 +1721,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = { FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology), FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology), FEAT_OPA(HEADER_BRANCH_STACK, branch_stack), + FEAT_OPA(HEADER_PMU_MAPPINGS, pmu_mappings), }; struct header_print_data { diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h index 24962e707e5b..9d5eedceda72 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -28,6 +28,7 @@ enum { HEADER_CPU_TOPOLOGY, HEADER_NUMA_TOPOLOGY, HEADER_BRANCH_STACK, + HEADER_PMU_MAPPINGS, HEADER_LAST_FEATURE, HEADER_FEAT_BITS = 256, }; diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 67715a42cd6d..6631d828db3d 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -10,6 +10,8 @@ #include "pmu.h" #include "parse-events.h" +#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/" + int perf_pmu_parse(struct list_head *list, char *name); extern FILE *perf_pmu_in; @@ -69,7 +71,7 @@ static int pmu_format(char *name, struct list_head *format) return -1; snprintf(path, PATH_MAX, - "%s/bus/event_source/devices/%s/format", sysfs, name); + "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name); if (stat(path, &st) < 0) return 0; /* no error if format does not exist */ @@ -206,7 +208,7 @@ static int pmu_type(char *name, __u32 *type) return -1; snprintf(path, PATH_MAX, - "%s/bus/event_source/devices/%s/type", sysfs, name); + "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name); if (stat(path, &st) < 0) return -1; @@ -222,6 +224,35 @@ static int pmu_type(char *name, __u32 *type) return ret; } +/* Add all pmus in sysfs to pmu list: */ +static void pmu_read_sysfs(void) +{ + char path[PATH_MAX]; + const char *sysfs; + DIR *dir; + struct dirent *dent; + + sysfs = sysfs_find_mountpoint(); + if (!sysfs) + return; + + snprintf(path, PATH_MAX, + "%s" EVENT_SOURCE_DEVICE_PATH, sysfs); + + dir = opendir(path); + if (!dir) + return; + + while ((dent = readdir(dir))) { + if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) + continue; + /* add to static LIST_HEAD(pmus): */ + perf_pmu__find(dent->d_name); + } + + closedir(dir); +} + static struct perf_pmu *pmu_lookup(char *name) { struct perf_pmu *pmu; @@ -267,6 +298,21 @@ static struct perf_pmu *pmu_find(char *name) return NULL; } +struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu) +{ + /* + * pmu iterator: If pmu is NULL, we start at the begin, + * otherwise return the next pmu. Returns NULL on end. + */ + if (!pmu) { + pmu_read_sysfs(); + pmu = list_prepare_entry(pmu, &pmus, list); + } + list_for_each_entry_continue(pmu, &pmus, list) + return pmu; + return NULL; +} + struct perf_pmu *perf_pmu__find(char *name) { struct perf_pmu *pmu; diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index 535f2c5258ab..47f68d3cc5d1 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -46,5 +46,7 @@ int perf_pmu__new_format(struct list_head *list, char *name, int config, unsigned long *bits); void perf_pmu__set_format(unsigned long *bits, long from, long to); +struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu); + int perf_pmu__test(void); #endif /* __PMU_H */ |