Commit a6146d50 authored by Zheng Yan's avatar Zheng Yan Committed by Ingo Molnar
Browse files

perf/tool: Add PMU event alias support 



Add support to specify alias term within the event description.

The definition of pmu event alias is located at:

  ${sysfs_mount}/bus/event_source/devices/${pmu}/events/

Each file in the 'events' directory defines a event alias. Its contents
are like:

  config=1,config1=2

Using pmu event alias, an event can be now specified like:

  uncore/CLOCKTICKS/ or uncore/event=CLOCKTICKS/

Signed-off-by: default avatarZheng Yan <zheng.z.yan@intel.com>
[ Cleaned it up. ]
Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1339741902-8449-13-git-send-email-zheng.z.yan@intel.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 90e2b22d

tools/perf/util/parse-events.c

+10 −0
Original line number Diff line number Diff line
@@ -701,6 +701,9 @@ int parse_events_add_pmu(struct list_head **list, int *idx, 


	memset(&attr, 0, sizeof(attr));



	if (perf_pmu__check_alias(pmu, head_config))

		return -EINVAL;



	/*

	 * Configure hardcoded terms first, no need to check

	 * return value when called with fail == 0 ;)
@@ -1143,6 +1146,13 @@ int parse_events__term_str(struct parse_events__term **term, 
			config, str, 0);

}



int parse_events__term_clone(struct parse_events__term **new,

			     struct parse_events__term *term)

{

	return new_term(new, term->type_val, term->type_term, term->config,

			term->val.str, term->val.num);

}



void parse_events__free_terms(struct list_head *terms)

{

	struct parse_events__term *term, *h;

tools/perf/util/parse-events.h

+2 −0
Original line number Diff line number Diff line
@@ -78,6 +78,8 @@ int parse_events__term_num(struct parse_events__term **_term, 
			   int type_term, char *config, long num);

int parse_events__term_str(struct parse_events__term **_term,

			   int type_term, char *config, char *str);

int parse_events__term_clone(struct parse_events__term **new,

			     struct parse_events__term *term);

void parse_events__free_terms(struct list_head *terms);

int parse_events_modifier(struct list_head *list, char *str);

int parse_events_add_tracepoint(struct list_head **list, int *idx,

tools/perf/util/pmu.c

+166 −0
Original line number Diff line number Diff line
@@ -80,6 +80,114 @@ static int pmu_format(char *name, struct list_head *format) 
	return 0;

}



static int perf_pmu__new_alias(struct list_head *list, char *name, FILE *file)

{

	struct perf_pmu__alias *alias;

	char buf[256];

	int ret;



	ret = fread(buf, 1, sizeof(buf), file);

	if (ret == 0)

		return -EINVAL;

	buf[ret] = 0;



	alias = malloc(sizeof(*alias));

	if (!alias)

		return -ENOMEM;



	INIT_LIST_HEAD(&alias->terms);

	ret = parse_events_terms(&alias->terms, buf);

	if (ret) {

		free(alias);

		return ret;

	}



	alias->name = strdup(name);

	list_add_tail(&alias->list, list);

	return 0;

}



/*

 * Process all the sysfs attributes located under the directory

 * specified in 'dir' parameter.

 */

static int pmu_aliases_parse(char *dir, struct list_head *head)

{

	struct dirent *evt_ent;

	DIR *event_dir;

	int ret = 0;



	event_dir = opendir(dir);

	if (!event_dir)

		return -EINVAL;



	while (!ret && (evt_ent = readdir(event_dir))) {

		char path[PATH_MAX];

		char *name = evt_ent->d_name;

		FILE *file;



		if (!strcmp(name, ".") || !strcmp(name, ".."))

			continue;



		snprintf(path, PATH_MAX, "%s/%s", dir, name);



		ret = -EINVAL;

		file = fopen(path, "r");

		if (!file)

			break;

		ret = perf_pmu__new_alias(head, name, file);

		fclose(file);

	}



	closedir(event_dir);

	return ret;

}



/*

 * Reading the pmu event aliases definition, which should be located at:

 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.

 */

static int pmu_aliases(char *name, struct list_head *head)

{

	struct stat st;

	char path[PATH_MAX];

	const char *sysfs;



	sysfs = sysfs_find_mountpoint();

	if (!sysfs)

		return -1;



	snprintf(path, PATH_MAX,

		 "%s/bus/event_source/devices/%s/events", sysfs, name);



	if (stat(path, &st) < 0)

		return -1;



	if (pmu_aliases_parse(path, head))

		return -1;



	return 0;

}



static int pmu_alias_terms(struct perf_pmu__alias *alias,

			   struct list_head *terms)

{

	struct parse_events__term *term, *clone;

	LIST_HEAD(list);

	int ret;



	list_for_each_entry(term, &alias->terms, list) {

		ret = parse_events__term_clone(&clone, term);

		if (ret) {

			parse_events__free_terms(&list);

			return ret;

		}

		list_add_tail(&clone->list, &list);

	}

	list_splice(&list, terms);

	return 0;

}



/*

 * Reading/parsing the default pmu type value, which should be

 * located at:
@@ -118,6 +226,7 @@ static struct perf_pmu *pmu_lookup(char *name) 
{

	struct perf_pmu *pmu;

	LIST_HEAD(format);

	LIST_HEAD(aliases);

	__u32 type;



	/*
@@ -135,8 +244,12 @@ static struct perf_pmu *pmu_lookup(char *name) 
	if (!pmu)

		return NULL;



	pmu_aliases(name, &aliases);



	INIT_LIST_HEAD(&pmu->format);

	INIT_LIST_HEAD(&pmu->aliases);

	list_splice(&format, &pmu->format);

	list_splice(&aliases, &pmu->aliases);

	pmu->name = strdup(name);

	pmu->type = type;

	return pmu;
@@ -279,6 +392,59 @@ int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr, 
	return pmu_config(&pmu->format, attr, head_terms);

}



static struct perf_pmu__alias *pmu_find_alias(struct perf_pmu *pmu,

					      struct parse_events__term *term)

{

	struct perf_pmu__alias *alias;

	char *name;



	if (parse_events__is_hardcoded_term(term))

		return NULL;



	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {

		if (term->val.num != 1)

			return NULL;

		if (pmu_find_format(&pmu->format, term->config))

			return NULL;

		name = term->config;

	} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {

		if (strcasecmp(term->config, "event"))

			return NULL;

		name = term->val.str;

	} else {

		return NULL;

	}



	list_for_each_entry(alias, &pmu->aliases, list) {

		if (!strcasecmp(alias->name, name))

			return alias;

	}

	return NULL;

}



/*

 * Find alias in the terms list and replace it with the terms

 * defined for the alias

 */

int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)

{

	struct parse_events__term *term, *h;

	struct perf_pmu__alias *alias;

	int ret;



	list_for_each_entry_safe(term, h, head_terms, list) {

		alias = pmu_find_alias(pmu, term);

		if (!alias)

			continue;

		ret = pmu_alias_terms(alias, &term->list);

		if (ret)

			return ret;

		list_del(&term->list);

		free(term);

	}

	return 0;

}



int perf_pmu__new_format(struct list_head *list, char *name,

			 int config, unsigned long *bits)

{

tools/perf/util/pmu.h

+10 −1
Original line number Diff line number Diff line
@@ -19,17 +19,26 @@ struct perf_pmu__format { 
	struct list_head list;

};



struct perf_pmu__alias {

	char *name;

	struct list_head terms;

	struct list_head list;

};



struct perf_pmu {

	char *name;

	__u32 type;

	struct list_head format;

	struct list_head aliases;

	struct list_head list;

};



struct perf_pmu *perf_pmu__find(char *name);

int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,

		     struct list_head *head_terms);



int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms);

struct list_head *perf_pmu__alias(struct perf_pmu *pmu,

				struct list_head *head_terms);

int perf_pmu_wrap(void);

void perf_pmu_error(struct list_head *list, char *name, char const *msg);

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