From 688d4dfcdd624192cbf03c08402e444d1d11f294 Mon Sep 17 00:00:00 2001 From: Cody P Schafer Date: Wed, 7 Jan 2015 17:13:50 -0800 Subject: [PATCH] perf tools: Support parsing parameterized events Enable event specification like: pmu/event_name,param1=0x1,param2=0x4/ Assuming that /sys/bus/event_source/devices/pmu/events/event_name Contains something like param2=?,bar=1,param1=? Signed-off-by: Cody P Schafer Signed-off-by: Sukadev Bhattiprolu Acked-by: Jiri Olsa Cc: Cody P Schafer Cc: Haren Myneni Cc: Jiri Olsa Cc: Michael Ellerman Cc: Paul Mackerras Cc: Peter Zijlstra Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1420679633-28856-2-git-send-email-sukadev@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-events.h | 1 + tools/perf/util/pmu.c | 74 +++++++++++++++++++++++++++++----- 2 files changed, 64 insertions(+), 11 deletions(-) diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index db2cf78ff0f3..ca226cef8460 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -71,6 +71,7 @@ struct parse_events_term { int type_val; int type_term; struct list_head list; + bool used; }; struct parse_events_evlist { diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 5c9c4947cfb4..bfbecf7abd38 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -550,6 +550,35 @@ static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v, } } +/* + * Term is a string term, and might be a param-term. Try to look up it's value + * in the remaining terms. + * - We have a term like "base-or-format-term=param-term", + * - We need to find the value supplied for "param-term" (with param-term named + * in a config string) later on in the term list. + */ +static int pmu_resolve_param_term(struct parse_events_term *term, + struct list_head *head_terms, + __u64 *value) +{ + struct parse_events_term *t; + + list_for_each_entry(t, head_terms, list) { + if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) { + if (!strcmp(t->config, term->config)) { + t->used = true; + *value = t->val.num; + return 0; + } + } + } + + if (verbose) + printf("Required parameter '%s' not specified\n", term->config); + + return -1; +} + /* * Setup one of config[12] attr members based on the * user input data - term parameter. @@ -557,25 +586,33 @@ static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v, static int pmu_config_term(struct list_head *formats, struct perf_event_attr *attr, struct parse_events_term *term, + struct list_head *head_terms, bool zero) { struct perf_pmu_format *format; __u64 *vp; + __u64 val; + + /* + * If this is a parameter we've already used for parameterized-eval, + * skip it in normal eval. + */ + if (term->used) + return 0; /* - * Support only for hardcoded and numnerial terms. * Hardcoded terms should be already in, so nothing * to be done for them. */ if (parse_events__is_hardcoded_term(term)) return 0; - if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) - return -EINVAL; - format = pmu_find_format(formats, term->config); - if (!format) + if (!format) { + if (verbose) + printf("Invalid event/parameter '%s'\n", term->config); return -EINVAL; + } switch (format->value) { case PERF_PMU_FORMAT_VALUE_CONFIG: @@ -592,11 +629,25 @@ static int pmu_config_term(struct list_head *formats, } /* - * XXX If we ever decide to go with string values for - * non-hardcoded terms, here's the place to translate - * them into value. + * Either directly use a numeric term, or try to translate string terms + * using event parameters. */ - pmu_format_value(format->bits, term->val.num, vp, zero); + if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) + val = term->val.num; + else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) { + if (strcmp(term->val.str, "?")) { + if (verbose) + pr_info("Invalid sysfs entry %s=%s\n", + term->config, term->val.str); + return -EINVAL; + } + + if (pmu_resolve_param_term(term, head_terms, &val)) + return -EINVAL; + } else + return -EINVAL; + + pmu_format_value(format->bits, val, vp, zero); return 0; } @@ -607,9 +658,10 @@ int perf_pmu__config_terms(struct list_head *formats, { struct parse_events_term *term; - list_for_each_entry(term, head_terms, list) - if (pmu_config_term(formats, attr, term, zero)) + list_for_each_entry(term, head_terms, list) { + if (pmu_config_term(formats, attr, term, head_terms, zero)) return -EINVAL; + } return 0; } -- 2.20.1