From: Jiri Olsa <jolsa@xxxxxxxxxx> [ Upstream commit 4929e95a1400e45b4b5a87fd3ce10273444187d4 ] Jin Yao reported issue with possible conflict between raw events and term values in pmu event syntax. Currently following syntax is resolved as raw event with 0xead value: uncore_imc_free_running/read/ instead of using 'read' term from uncore_imc_free_running pmu, because 'read' is correct raw event syntax with 0xead value. To solve this issue we do following: - check existing terms during rXXXX syntax processing and make them priority in case of conflict - allow pmu/r0x1234/ syntax to be able to specify conflicting raw event (implemented in previous patch) Also add automated tests for this and perf_pmu__parse_cleanup call to parse_events_terms, so the test gets properly cleaned up. Fixes: 3a6c51e4d66c ("perf parser: Add support to specify rXXX event with pmu") Reported-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> Tested-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx> Acked-by: Ian Rogers <irogers@xxxxxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Michael Petlan <mpetlan@xxxxxxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Stephane Eranian <eranian@xxxxxxxxxx> Cc: Thomas Richter <tmricht@xxxxxxxxxxxxx> Link: http://lore.kernel.org/lkml/20200726075244.1191481-2-jolsa@xxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- tools/perf/tests/parse-events.c | 37 ++++++++++++++++++++++++++++++++- tools/perf/util/parse-events.c | 28 +++++++++++++++++++++++++ tools/perf/util/parse-events.h | 2 ++ tools/perf/util/parse-events.l | 19 ++++++++++------- 4 files changed, 77 insertions(+), 9 deletions(-) diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c index 895188b63f963..6a2ec6ec0d0ef 100644 --- a/tools/perf/tests/parse-events.c +++ b/tools/perf/tests/parse-events.c @@ -631,6 +631,34 @@ static int test__checkterms_simple(struct list_head *terms) TEST_ASSERT_VAL("wrong val", term->val.num == 1); TEST_ASSERT_VAL("wrong config", !strcmp(term->config, "umask")); + /* + * read + * + * The perf_pmu__test_parse_init injects 'read' term into + * perf_pmu_events_list, so 'read' is evaluated as read term + * and not as raw event with 'ead' hex value. + */ + term = list_entry(term->list.next, struct parse_events_term, list); + TEST_ASSERT_VAL("wrong type term", + term->type_term == PARSE_EVENTS__TERM_TYPE_USER); + TEST_ASSERT_VAL("wrong type val", + term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); + TEST_ASSERT_VAL("wrong val", term->val.num == 1); + TEST_ASSERT_VAL("wrong config", !strcmp(term->config, "read")); + + /* + * r0xead + * + * To be still able to pass 'ead' value with 'r' syntax, + * we added support to parse 'r0xHEX' event. + */ + term = list_entry(term->list.next, struct parse_events_term, list); + TEST_ASSERT_VAL("wrong type term", + term->type_term == PARSE_EVENTS__TERM_TYPE_CONFIG); + TEST_ASSERT_VAL("wrong type val", + term->type_val == PARSE_EVENTS__TERM_TYPE_NUM); + TEST_ASSERT_VAL("wrong val", term->val.num == 0xead); + TEST_ASSERT_VAL("wrong config", !term->config); return 0; } @@ -1776,7 +1804,7 @@ struct terms_test { static struct terms_test test__terms[] = { [0] = { - .str = "config=10,config1,config2=3,umask=1", + .str = "config=10,config1,config2=3,umask=1,read,r0xead", .check = test__checkterms_simple, }, }; @@ -1836,6 +1864,13 @@ static int test_term(struct terms_test *t) INIT_LIST_HEAD(&terms); + /* + * The perf_pmu__test_parse_init prepares perf_pmu_events_list + * which gets freed in parse_events_terms. + */ + if (perf_pmu__test_parse_init()) + return -1; + ret = parse_events_terms(&terms, t->str); if (ret) { pr_debug("failed to parse terms '%s', err %d\n", diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 3decbb203846a..4476de0e678aa 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -2017,6 +2017,32 @@ static void perf_pmu__parse_init(void) perf_pmu__parse_cleanup(); } +/* + * This function injects special term in + * perf_pmu_events_list so the test code + * can check on this functionality. + */ +int perf_pmu__test_parse_init(void) +{ + struct perf_pmu_event_symbol *list; + + list = malloc(sizeof(*list) * 1); + if (!list) + return -ENOMEM; + + list->type = PMU_EVENT_SYMBOL; + list->symbol = strdup("read"); + + if (!list->symbol) { + free(list); + return -ENOMEM; + } + + perf_pmu_events_list = list; + perf_pmu_events_list_num = 1; + return 0; +} + enum perf_pmu_event_symbol_type perf_pmu__parse_check(const char *name) { @@ -2078,6 +2104,8 @@ int parse_events_terms(struct list_head *terms, const char *str) int ret; ret = parse_events__scanner(str, &parse_state); + perf_pmu__parse_cleanup(); + if (!ret) { list_splice(parse_state.terms, terms); zfree(&parse_state.terms); diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index 1fe23a2f9b36e..0b8cdb7270f04 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -253,4 +253,6 @@ static inline bool is_sdt_event(char *str __maybe_unused) } #endif /* HAVE_LIBELF_SUPPORT */ +int perf_pmu__test_parse_init(void); + #endif /* __PERF_PARSE_EVENTS_H */ diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index 002802e17059e..7332d16cb4fc7 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -41,14 +41,6 @@ static int value(yyscan_t scanner, int base) return __value(yylval, text, base, PE_VALUE); } -static int raw(yyscan_t scanner) -{ - YYSTYPE *yylval = parse_events_get_lval(scanner); - char *text = parse_events_get_text(scanner); - - return __value(yylval, text + 1, 16, PE_RAW); -} - static int str(yyscan_t scanner, int token) { YYSTYPE *yylval = parse_events_get_lval(scanner); @@ -72,6 +64,17 @@ static int str(yyscan_t scanner, int token) return token; } +static int raw(yyscan_t scanner) +{ + YYSTYPE *yylval = parse_events_get_lval(scanner); + char *text = parse_events_get_text(scanner); + + if (perf_pmu__parse_check(text) == PMU_EVENT_SYMBOL) + return str(scanner, PE_NAME); + + return __value(yylval, text + 1, 16, PE_RAW); +} + static bool isbpf_suffix(char *text) { int len = strlen(text); -- 2.25.1