From c091ee90897aacf60aee510464cfc28b4041186f Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Thu, 24 Aug 2023 19:39:58 -0700 Subject: perf pmu: Remove logic for PMU name being NULL The PMU name could be NULL in the case of the fake_pmu. Initialize the name for the fake_pmu to "fake" so that all other logic can assume it is initialized. Add a const to the type of name so that a literal can be used to avoid additional initialization code. Propagate the cost through related routines and remove now unnecessary "(char *)" casts. Doing this located a bug in builtin-list for the pmu_glob that was missing a strdup. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20230825024002.801955-3-irogers@google.com Cc: K Prateek Nayak Cc: Ravi Bangoria Cc: James Clark Cc: Mark Rutland Cc: Suzuki Poulouse Cc: Sean Christopherson Cc: Wei Li Cc: Peter Zijlstra Cc: Adrian Hunter Cc: Arnaldo Carvalho de Melo Cc: Huacai Chen Cc: Jiri Olsa Cc: Namhyung Kim Cc: Will Deacon Cc: Leo Yan Cc: Mike Leach Cc: Kajol Jain Cc: Alexander Shishkin Cc: Kan Liang Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.org Cc: Ming Wang Cc: John Garry Cc: Ingo Molnar Cc: linux-kernel@vger.kernel.org Cc: linux-perf-users@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/arch/arm64/util/mem-events.c | 2 +- tools/perf/arch/powerpc/util/mem-events.c | 6 +++--- tools/perf/arch/x86/util/mem-events.c | 8 ++++---- tools/perf/arch/x86/util/pmu.c | 10 +++++----- tools/perf/builtin-list.c | 2 +- tools/perf/tests/pmu-events.c | 16 ++++++++-------- tools/perf/util/env.c | 8 ++------ tools/perf/util/header.c | 8 +------- tools/perf/util/mem-events.c | 16 ++++++++-------- tools/perf/util/mem-events.h | 2 +- tools/perf/util/parse-events.c | 7 ++----- tools/perf/util/parse-events.h | 2 +- tools/perf/util/parse-events.y | 2 +- tools/perf/util/pmu.c | 16 +++++++++------- tools/perf/util/pmu.h | 8 ++++---- 15 files changed, 51 insertions(+), 62 deletions(-) diff --git a/tools/perf/arch/arm64/util/mem-events.c b/tools/perf/arch/arm64/util/mem-events.c index df817d1f9f3e..3bcc5c7035c2 100644 --- a/tools/perf/arch/arm64/util/mem-events.c +++ b/tools/perf/arch/arm64/util/mem-events.c @@ -20,7 +20,7 @@ struct perf_mem_event *perf_mem_events__ptr(int i) return &perf_mem_events[i]; } -char *perf_mem_events__name(int i, char *pmu_name __maybe_unused) +const char *perf_mem_events__name(int i, const char *pmu_name __maybe_unused) { struct perf_mem_event *e = perf_mem_events__ptr(i); diff --git a/tools/perf/arch/powerpc/util/mem-events.c b/tools/perf/arch/powerpc/util/mem-events.c index 4120fafe0be4..78b986e5268d 100644 --- a/tools/perf/arch/powerpc/util/mem-events.c +++ b/tools/perf/arch/powerpc/util/mem-events.c @@ -3,10 +3,10 @@ #include "mem-events.h" /* PowerPC does not support 'ldlat' parameter. */ -char *perf_mem_events__name(int i, char *pmu_name __maybe_unused) +const char *perf_mem_events__name(int i, const char *pmu_name __maybe_unused) { if (i == PERF_MEM_EVENTS__LOAD) - return (char *) "cpu/mem-loads/"; + return "cpu/mem-loads/"; - return (char *) "cpu/mem-stores/"; + return "cpu/mem-stores/"; } diff --git a/tools/perf/arch/x86/util/mem-events.c b/tools/perf/arch/x86/util/mem-events.c index a8a782bcb121..191b372f9a2d 100644 --- a/tools/perf/arch/x86/util/mem-events.c +++ b/tools/perf/arch/x86/util/mem-events.c @@ -52,7 +52,7 @@ bool is_mem_loads_aux_event(struct evsel *leader) return leader->core.attr.config == MEM_LOADS_AUX; } -char *perf_mem_events__name(int i, char *pmu_name) +const char *perf_mem_events__name(int i, const char *pmu_name) { struct perf_mem_event *e = perf_mem_events__ptr(i); @@ -65,7 +65,7 @@ char *perf_mem_events__name(int i, char *pmu_name) if (!pmu_name) { mem_loads_name__init = true; - pmu_name = (char *)"cpu"; + pmu_name = "cpu"; } if (perf_pmus__have_event(pmu_name, "mem-loads-aux")) { @@ -82,12 +82,12 @@ char *perf_mem_events__name(int i, char *pmu_name) if (i == PERF_MEM_EVENTS__STORE) { if (!pmu_name) - pmu_name = (char *)"cpu"; + pmu_name = "cpu"; scnprintf(mem_stores_name, sizeof(mem_stores_name), e->name, pmu_name); return mem_stores_name; } - return (char *)e->name; + return e->name; } diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c index 65d8cdff4d5f..f428cffb0378 100644 --- a/tools/perf/arch/x86/util/pmu.c +++ b/tools/perf/arch/x86/util/pmu.c @@ -126,7 +126,7 @@ close_dir: return ret; } -static char *__pmu_find_real_name(const char *name) +static const char *__pmu_find_real_name(const char *name) { struct pmu_alias *pmu_alias; @@ -135,10 +135,10 @@ static char *__pmu_find_real_name(const char *name) return pmu_alias->name; } - return (char *)name; + return name; } -char *pmu_find_real_name(const char *name) +const char *pmu_find_real_name(const char *name) { if (cached_list) return __pmu_find_real_name(name); @@ -149,7 +149,7 @@ char *pmu_find_real_name(const char *name) return __pmu_find_real_name(name); } -static char *__pmu_find_alias_name(const char *name) +static const char *__pmu_find_alias_name(const char *name) { struct pmu_alias *pmu_alias; @@ -160,7 +160,7 @@ static char *__pmu_find_alias_name(const char *name) return NULL; } -char *pmu_find_alias_name(const char *name) +const char *pmu_find_alias_name(const char *name) { if (cached_list) return __pmu_find_alias_name(name); diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c index d8b9f606e734..8ac97a82744d 100644 --- a/tools/perf/builtin-list.c +++ b/tools/perf/builtin-list.c @@ -513,7 +513,7 @@ int cmd_list(int argc, const char **argv) ret = -1; goto out; } - default_ps.pmu_glob = pmu->name; + default_ps.pmu_glob = strdup(pmu->name); } } print_cb.print_start(ps); diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c index 28c8789c4305..d92de3d5365e 100644 --- a/tools/perf/tests/pmu-events.c +++ b/tools/perf/tests/pmu-events.c @@ -522,7 +522,7 @@ static int test_core_pmu_event_aliases_cb(void *state, struct pmu_event_info *al } /* Verify aliases are as expected */ -static int __test_core_pmu_event_aliases(char *pmu_name, int *count) +static int __test_core_pmu_event_aliases(const char *pmu_name, int *count) { struct perf_pmu_test_event const **test_event_table; struct perf_pmu *pmu; @@ -635,7 +635,7 @@ static int __test_uncore_pmu_event_aliases(struct perf_pmu_test_pmu *test_pmu) static struct perf_pmu_test_pmu test_pmus[] = { { .pmu = { - .name = (char *)"hisi_sccl1_ddrc2", + .name = "hisi_sccl1_ddrc2", .is_uncore = 1, }, .aliases = { @@ -644,7 +644,7 @@ static struct perf_pmu_test_pmu test_pmus[] = { }, { .pmu = { - .name = (char *)"uncore_cbox_0", + .name = "uncore_cbox_0", .is_uncore = 1, }, .aliases = { @@ -655,7 +655,7 @@ static struct perf_pmu_test_pmu test_pmus[] = { }, { .pmu = { - .name = (char *)"hisi_sccl3_l3c7", + .name = "hisi_sccl3_l3c7", .is_uncore = 1, }, .aliases = { @@ -664,7 +664,7 @@ static struct perf_pmu_test_pmu test_pmus[] = { }, { .pmu = { - .name = (char *)"uncore_imc_free_running_0", + .name = "uncore_imc_free_running_0", .is_uncore = 1, }, .aliases = { @@ -673,7 +673,7 @@ static struct perf_pmu_test_pmu test_pmus[] = { }, { .pmu = { - .name = (char *)"uncore_imc_0", + .name = "uncore_imc_0", .is_uncore = 1, }, .aliases = { @@ -682,7 +682,7 @@ static struct perf_pmu_test_pmu test_pmus[] = { }, { .pmu = { - .name = (char *)"uncore_sys_ddr_pmu0", + .name = "uncore_sys_ddr_pmu0", .is_uncore = 1, .id = (char *)"v8", }, @@ -692,7 +692,7 @@ static struct perf_pmu_test_pmu test_pmus[] = { }, { .pmu = { - .name = (char *)"uncore_sys_ccn_pmu4", + .name = "uncore_sys_ccn_pmu4", .is_uncore = 1, .id = (char *)"0x01", }, diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 9eabf3ec56e9..a164164001fb 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -324,11 +324,9 @@ int perf_env__read_pmu_mappings(struct perf_env *env) u32 pmu_num = 0; struct strbuf sb; - while ((pmu = perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; + while ((pmu = perf_pmus__scan(pmu))) pmu_num++; - } + if (!pmu_num) { pr_debug("pmu mappings not available\n"); return -ENOENT; @@ -339,8 +337,6 @@ int perf_env__read_pmu_mappings(struct perf_env *env) return -ENOMEM; while ((pmu = perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; if (strbuf_addf(&sb, "%u:%s", pmu->type, pmu->name) < 0) goto error; /* include a NULL character at the end */ diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 13c71d28e0eb..9f35d86a3351 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -746,20 +746,14 @@ static int write_pmu_mappings(struct feat_fd *ff, * Do a first pass to count number of pmu to avoid lseek so this * works in pipe mode as well. */ - while ((pmu = perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; + while ((pmu = perf_pmus__scan(pmu))) pmu_num++; - } ret = do_write(ff, &pmu_num, sizeof(pmu_num)); if (ret < 0) return ret; while ((pmu = perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; - ret = do_write(ff, &pmu->type, sizeof(pmu->type)); if (ret < 0) return ret; diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c index c07fe3a90722..39ffe8ceb380 100644 --- a/tools/perf/util/mem-events.c +++ b/tools/perf/util/mem-events.c @@ -37,7 +37,7 @@ struct perf_mem_event * __weak perf_mem_events__ptr(int i) return &perf_mem_events[i]; } -char * __weak perf_mem_events__name(int i, char *pmu_name __maybe_unused) +const char * __weak perf_mem_events__name(int i, const char *pmu_name __maybe_unused) { struct perf_mem_event *e = perf_mem_events__ptr(i); @@ -53,7 +53,7 @@ char * __weak perf_mem_events__name(int i, char *pmu_name __maybe_unused) return mem_loads_name; } - return (char *)e->name; + return e->name; } __weak bool is_mem_loads_aux_event(struct evsel *leader __maybe_unused) @@ -186,7 +186,6 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr, int i = *argv_nr, k = 0; struct perf_mem_event *e; struct perf_pmu *pmu; - char *s; for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) { e = perf_mem_events__ptr(j); @@ -209,15 +208,16 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr, } while ((pmu = perf_pmus__scan(pmu)) != NULL) { + const char *s = perf_mem_events__name(j, pmu->name); + rec_argv[i++] = "-e"; - s = perf_mem_events__name(j, pmu->name); if (s) { - s = strdup(s); - if (!s) + char *copy = strdup(s); + if (!copy) return -1; - rec_argv[i++] = s; - rec_tmp[k++] = s; + rec_argv[i++] = copy; + rec_tmp[k++] = copy; } } } diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h index 12372309d60e..b40ad6ea93fc 100644 --- a/tools/perf/util/mem-events.h +++ b/tools/perf/util/mem-events.h @@ -38,7 +38,7 @@ extern unsigned int perf_mem_events__loads_ldlat; int perf_mem_events__parse(const char *str); int perf_mem_events__init(void); -char *perf_mem_events__name(int i, char *pmu_name); +const char *perf_mem_events__name(int i, const char *pmu_name); struct perf_mem_event *perf_mem_events__ptr(int i); bool is_mem_loads_aux_event(struct evsel *leader); diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index c71e135d7335..621bdd157a0f 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -262,7 +262,7 @@ __add_event(struct list_head *list, int *idx, evsel->core.is_pmu_core = pmu ? pmu->is_core : false; evsel->auto_merge_stats = auto_merge_stats; evsel->pmu = pmu; - evsel->pmu_name = pmu && pmu->name ? strdup(pmu->name) : NULL; + evsel->pmu_name = pmu ? strdup(pmu->name) : NULL; if (name) evsel->name = strdup(name); @@ -437,9 +437,6 @@ bool parse_events__filter_pmu(const struct parse_events_state *parse_state, if (parse_state->pmu_filter == NULL) return false; - if (pmu->name == NULL) - return true; - return strcmp(parse_state->pmu_filter, pmu->name) != 0; } @@ -1292,7 +1289,7 @@ static bool config_term_percore(struct list_head *config_terms) } int parse_events_add_pmu(struct parse_events_state *parse_state, - struct list_head *list, char *name, + struct list_head *list, const char *name, struct list_head *head_config, bool auto_merge_stats, void *loc_) { diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index c7f779420723..c4e8d8e94b28 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -176,7 +176,7 @@ int parse_events_add_breakpoint(struct parse_events_state *parse_state, u64 addr, char *type, u64 len, struct list_head *head_config); int parse_events_add_pmu(struct parse_events_state *parse_state, - struct list_head *list, char *name, + struct list_head *list, const char *name, struct list_head *head_config, bool auto_merge_stats, void *loc); diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 00da1f8c0baf..3a9d4e2513b5 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -307,7 +307,7 @@ PE_NAME opt_pmu_config } while ((pmu = perf_pmus__scan(pmu)) != NULL) { - char *name = pmu->name; + const char *name = pmu->name; if (parse_events__filter_pmu(parse_state, pmu)) continue; diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index bb2ca29cd7bd..a96ccc5c3b51 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -29,7 +29,9 @@ #include "fncache.h" #include "util/evsel_config.h" -struct perf_pmu perf_pmu__fake; +struct perf_pmu perf_pmu__fake = { + .name = "fake", +}; #define UNIT_MAX_LEN 31 /* max length for event unit name */ @@ -967,13 +969,13 @@ perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused) return NULL; } -char * __weak +const char * __weak pmu_find_real_name(const char *name) { - return (char *)name; + return name; } -char * __weak +const char * __weak pmu_find_alias_name(const char *name __maybe_unused) { return NULL; @@ -991,8 +993,8 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char { struct perf_pmu *pmu; __u32 type; - char *name = pmu_find_real_name(lookup_name); - char *alias_name; + const char *name = pmu_find_real_name(lookup_name); + const char *alias_name; pmu = zalloc(sizeof(*pmu)); if (!pmu) @@ -1974,7 +1976,7 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config, name ?: "N/A", buf, config_name, config); } -int perf_pmu__match(char *pattern, char *name, char *tok) +int perf_pmu__match(const char *pattern, const char *name, const char *tok) { if (!name) return -1; diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index bae0de3ed7a5..e90169ab3dc2 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -39,7 +39,7 @@ struct perf_pmu_caps { */ struct perf_pmu { /** @name: The name of the PMU such as "cpu". */ - char *name; + const char *name; /** * @alias_name: Optional alternate name for the PMU determined in * architecture specific code. @@ -249,10 +249,10 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config, const char *config_name); void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu); -int perf_pmu__match(char *pattern, char *name, char *tok); +int perf_pmu__match(const char *pattern, const char *name, const char *tok); -char *pmu_find_real_name(const char *name); -char *pmu_find_alias_name(const char *name); +const char *pmu_find_real_name(const char *name); +const char *pmu_find_alias_name(const char *name); double perf_pmu__cpu_slots_per_cycle(void); int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size); int perf_pmu__pathname_scnprintf(char *buf, size_t size, -- cgit v1.2.3