[deliverable/linux.git] / tools / perf / util / pmu.c

#include <linux/list.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include "fs.h"
#include "util.h"
#include "pmu.h"
#include "parse-events.h"
#include "cpumap.h"

struct perf_pmu_alias {
	char *name;
	struct list_head terms;
	struct list_head list;
};

struct perf_pmu_format {
	char *name;
	int value;
	DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
	struct list_head list;
};

#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"

int perf_pmu_parse(struct list_head *list, char *name);
extern FILE *perf_pmu_in;

static LIST_HEAD(pmus);

/*
 * Parse & process all the sysfs attributes located under
 * the directory specified in 'dir' parameter.
 */
int perf_pmu__format_parse(char *dir, struct list_head *head)
{
	struct dirent *evt_ent;
	DIR *format_dir;
	int ret = 0;

	format_dir = opendir(dir);
	if (!format_dir)
		return -EINVAL;

	while (!ret && (evt_ent = readdir(format_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;

		perf_pmu_in = file;
		ret = perf_pmu_parse(head, name);
		fclose(file);
	}

	closedir(format_dir);
	return ret;
}

/*
 * Reading/parsing the default pmu format definition, which should be
 * located at:
 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
 */
static int pmu_format(const char *name, struct list_head *format)
{
	struct stat st;
	char path[PATH_MAX];
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return -1;

	snprintf(path, PATH_MAX,
		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);

	if (stat(path, &st) < 0)
		return 0;	/* no error if format does not exist */

	if (perf_pmu__format_parse(path, format))
		return -1;

	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(const char *name, struct list_head *head)
{
	struct stat st;
	char path[PATH_MAX];
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return -1;

	snprintf(path, PATH_MAX,
		 "%s/bus/event_source/devices/%s/events", sysfs, name);

	if (stat(path, &st) < 0)
		return 0;	 /* no error if 'events' does not exist */

	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:
 * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 */
static int pmu_type(const char *name, __u32 *type)
{
	struct stat st;
	char path[PATH_MAX];
	FILE *file;
	int ret = 0;
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return -1;

	snprintf(path, PATH_MAX,
		 "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);

	if (stat(path, &st) < 0)
		return -1;

	file = fopen(path, "r");
	if (!file)
		return -EINVAL;

	if (1 != fscanf(file, "%u", type))
		ret = -1;

	fclose(file);
	return ret;
}

/* Add all pmus in sysfs to pmu list: */
static void pmu_read_sysfs(void)
{
	char path[PATH_MAX];
	DIR *dir;
	struct dirent *dent;
	const char *sysfs = sysfs__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 cpu_map *pmu_cpumask(const char *name)
{
	struct stat st;
	char path[PATH_MAX];
	FILE *file;
	struct cpu_map *cpus;
	const char *sysfs = sysfs__mountpoint();

	if (!sysfs)
		return NULL;

	snprintf(path, PATH_MAX,
		 "%s/bus/event_source/devices/%s/cpumask", sysfs, name);

	if (stat(path, &st) < 0)
		return NULL;

	file = fopen(path, "r");
	if (!file)
		return NULL;

	cpus = cpu_map__read(file);
	fclose(file);
	return cpus;
}

static struct perf_pmu *pmu_lookup(const char *name)
{
	struct perf_pmu *pmu;
	LIST_HEAD(format);
	LIST_HEAD(aliases);
	__u32 type;

	/*
	 * The pmu data we store & need consists of the pmu
	 * type value and format definitions. Load both right
	 * now.
	 */
	if (pmu_format(name, &format))
		return NULL;

	if (pmu_aliases(name, &aliases))
		return NULL;

	if (pmu_type(name, &type))
		return NULL;

	pmu = zalloc(sizeof(*pmu));
	if (!pmu)
		return NULL;

	pmu->cpus = pmu_cpumask(name);

	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;
	list_add_tail(&pmu->list, &pmus);
	return pmu;
}

static struct perf_pmu *pmu_find(const char *name)
{
	struct perf_pmu *pmu;

	list_for_each_entry(pmu, &pmus, list)
		if (!strcmp(pmu->name, name))
			return pmu;

	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(const char *name)
{
	struct perf_pmu *pmu;

	/*
	 * Once PMU is loaded it stays in the list,
	 * so we keep us from multiple reading/parsing
	 * the pmu format definitions.
	 */
	pmu = pmu_find(name);
	if (pmu)
		return pmu;

	return pmu_lookup(name);
}

static struct perf_pmu_format *
pmu_find_format(struct list_head *formats, char *name)
{
	struct perf_pmu_format *format;

	list_for_each_entry(format, formats, list)
		if (!strcmp(format->name, name))
			return format;

	return NULL;
}

/*
 * Returns value based on the format definition (format parameter)
 * and unformated value (value parameter).
 *
 * TODO maybe optimize a little ;)
 */
static __u64 pmu_format_value(unsigned long *format, __u64 value)
{
	unsigned long fbit, vbit;
	__u64 v = 0;

	for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {

		if (!test_bit(fbit, format))
			continue;

		if (!(value & (1llu << vbit++)))
			continue;

		v |= (1llu << fbit);
	}

	return v;
}

/*
 * Setup one of config[12] attr members based on the
 * user input data - temr parameter.
 */
static int pmu_config_term(struct list_head *formats,
			   struct perf_event_attr *attr,
			   struct parse_events_term *term)
{
	struct perf_pmu_format *format;
	__u64 *vp;

	/*
	 * 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)
		return -EINVAL;

	switch (format->value) {
	case PERF_PMU_FORMAT_VALUE_CONFIG:
		vp = &attr->config;
		break;
	case PERF_PMU_FORMAT_VALUE_CONFIG1:
		vp = &attr->config1;
		break;
	case PERF_PMU_FORMAT_VALUE_CONFIG2:
		vp = &attr->config2;
		break;
	default:
		return -EINVAL;
	}

	/*
	 * XXX If we ever decide to go with string values for
	 * non-hardcoded terms, here's the place to translate
	 * them into value.
	 */
	*vp |= pmu_format_value(format->bits, term->val.num);
	return 0;
}

int perf_pmu__config_terms(struct list_head *formats,
			   struct perf_event_attr *attr,
			   struct list_head *head_terms)
{
	struct parse_events_term *term;

	list_for_each_entry(term, head_terms, list)
		if (pmu_config_term(formats, attr, term))
			return -EINVAL;

	return 0;
}

/*
 * Configures event's 'attr' parameter based on the:
 * 1) users input - specified in terms parameter
 * 2) pmu format definitions - specified by pmu parameter
 */
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
		     struct list_head *head_terms)
{
	attr->type = pmu->type;
	return perf_pmu__config_terms(&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)
{
	struct perf_pmu_format *format;

	format = zalloc(sizeof(*format));
	if (!format)
		return -ENOMEM;

	format->name = strdup(name);
	format->value = config;
	memcpy(format->bits, bits, sizeof(format->bits));

	list_add_tail(&format->list, list);
	return 0;
}

void perf_pmu__set_format(unsigned long *bits, long from, long to)
{
	long b;

	if (!to)
		to = from;

	memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
	for (b = from; b <= to; b++)
		set_bit(b, bits);
}

static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
			  struct perf_pmu_alias *alias)
{
	snprintf(buf, len, "%s/%s/", pmu->name, alias->name);
	return buf;
}

static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
			     struct perf_pmu_alias *alias)
{
	snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
	return buf;
}

static int cmp_string(const void *a, const void *b)
{
	const char * const *as = a;
	const char * const *bs = b;
	return strcmp(*as, *bs);
}

void print_pmu_events(const char *event_glob, bool name_only)
{
	struct perf_pmu *pmu;
	struct perf_pmu_alias *alias;
	char buf[1024];
	int printed = 0;
	int len, j;
	char **aliases;

	pmu = NULL;
	len = 0;
	while ((pmu = perf_pmu__scan(pmu)) != NULL)
		list_for_each_entry(alias, &pmu->aliases, list)
			len++;
	aliases = malloc(sizeof(char *) * len);
	if (!aliases)
		return;
	pmu = NULL;
	j = 0;
	while ((pmu = perf_pmu__scan(pmu)) != NULL)
		list_for_each_entry(alias, &pmu->aliases, list) {
			char *name = format_alias(buf, sizeof(buf), pmu, alias);
			bool is_cpu = !strcmp(pmu->name, "cpu");

			if (event_glob != NULL &&
			    !(strglobmatch(name, event_glob) ||
			      (!is_cpu && strglobmatch(alias->name,
						       event_glob))))
				continue;
			aliases[j] = name;
			if (is_cpu && !name_only)
				aliases[j] = format_alias_or(buf, sizeof(buf),
							      pmu, alias);
			aliases[j] = strdup(aliases[j]);
			j++;
		}
	len = j;
	qsort(aliases, len, sizeof(char *), cmp_string);
	for (j = 0; j < len; j++) {
		if (name_only) {
			printf("%s ", aliases[j]);
			continue;
		}
		printf("  %-50s [Kernel PMU event]\n", aliases[j]);
		free(aliases[j]);
		printed++;
	}
	if (printed)
		printf("\n");
	free(aliases);
}

bool pmu_have_event(const char *pname, const char *name)
{
	struct perf_pmu *pmu;
	struct perf_pmu_alias *alias;

	pmu = NULL;
	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
		if (strcmp(pname, pmu->name))
			continue;
		list_for_each_entry(alias, &pmu->aliases, list)
			if (!strcmp(alias->name, name))
				return true;
	}
	return false;
}
Commit	Line	Data
cd82a32e JO	1	#include <linux/list.h>
	2	#include <sys/types.h>
	3	#include <sys/stat.h>
	4	#include <unistd.h>
	5	#include <stdio.h>
	6	#include <dirent.h>
4299a549	7	#include "fs.h"
cd82a32e JO	8	#include "util.h"
	9	#include "pmu.h"
	10	#include "parse-events.h"
7ae92e74	11	#include "cpumap.h"
cd82a32e	12
ab1bf653 ACM	13	struct perf_pmu_alias {
	14	char *name;
	15	struct list_head terms;
	16	struct list_head list;
	17	};
	18
	19	struct perf_pmu_format {
	20	char *name;
	21	int value;
	22	DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
	23	struct list_head list;
	24	};
	25
50a9667c RR	26	#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
50a9667c RR	27
cd82a32e JO	28	int perf_pmu_parse(struct list_head list, char name);
	29	extern FILE *perf_pmu_in;
	30
	31	static LIST_HEAD(pmus);
	32
	33	/*
	34	* Parse & process all the sysfs attributes located under
	35	* the directory specified in 'dir' parameter.
	36	*/
cff7f956	37	int perf_pmu__format_parse(char dir, struct list_head head)
cd82a32e JO	38	{
	39	struct dirent *evt_ent;
	40	DIR *format_dir;
	41	int ret = 0;
	42
	43	format_dir = opendir(dir);
	44	if (!format_dir)
	45	return -EINVAL;
	46
	47	while (!ret && (evt_ent = readdir(format_dir))) {
	48	char path[PATH_MAX];
	49	char *name = evt_ent->d_name;
	50	FILE *file;
	51
	52	if (!strcmp(name, ".") \|\| !strcmp(name, ".."))
	53	continue;
	54
	55	snprintf(path, PATH_MAX, "%s/%s", dir, name);
	56
	57	ret = -EINVAL;
	58	file = fopen(path, "r");
	59	if (!file)
	60	break;
	61
	62	perf_pmu_in = file;
	63	ret = perf_pmu_parse(head, name);
	64	fclose(file);
	65	}
	66
	67	closedir(format_dir);
	68	return ret;
	69	}
	70
	71	/*
	72	* Reading/parsing the default pmu format definition, which should be
	73	* located at:
	74	* /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
	75	*/
b6b96fb4	76	static int pmu_format(const char name, struct list_head format)
cd82a32e JO	77	{
	78	struct stat st;
	79	char path[PATH_MAX];
cf38fada	80	const char *sysfs = sysfs__mountpoint();
cd82a32e	81
cd82a32e JO	82	if (!sysfs)
	83	return -1;
	84
	85	snprintf(path, PATH_MAX,
50a9667c	86	"%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
cd82a32e JO	87
cd82a32e JO	88	if (stat(path, &st) < 0)
9bc8f9fe	89	return 0; /* no error if format does not exist */
cd82a32e	90
cff7f956	91	if (perf_pmu__format_parse(path, format))
cd82a32e JO	92	return -1;
	93
	94	return 0;
	95	}
	96
a6146d50 ZY	97	static int perf_pmu__new_alias(struct list_head list, char name, FILE *file)
a6146d50 ZY	98	{
5c6ccc37	99	struct perf_pmu_alias *alias;
a6146d50 ZY	100	char buf[256];
	101	int ret;
	102
	103	ret = fread(buf, 1, sizeof(buf), file);
	104	if (ret == 0)
	105	return -EINVAL;
	106	buf[ret] = 0;
	107
	108	alias = malloc(sizeof(*alias));
	109	if (!alias)
	110	return -ENOMEM;
	111
	112	INIT_LIST_HEAD(&alias->terms);
	113	ret = parse_events_terms(&alias->terms, buf);
	114	if (ret) {
	115	free(alias);
	116	return ret;
	117	}
	118
	119	alias->name = strdup(name);
	120	list_add_tail(&alias->list, list);
	121	return 0;
	122	}
	123
	124	/*
	125	* Process all the sysfs attributes located under the directory
	126	* specified in 'dir' parameter.
	127	*/
	128	static int pmu_aliases_parse(char dir, struct list_head head)
	129	{
	130	struct dirent *evt_ent;
	131	DIR *event_dir;
	132	int ret = 0;
	133
	134	event_dir = opendir(dir);
	135	if (!event_dir)
	136	return -EINVAL;
	137
	138	while (!ret && (evt_ent = readdir(event_dir))) {
	139	char path[PATH_MAX];
	140	char *name = evt_ent->d_name;
	141	FILE *file;
	142
	143	if (!strcmp(name, ".") \|\| !strcmp(name, ".."))
	144	continue;
	145
	146	snprintf(path, PATH_MAX, "%s/%s", dir, name);
	147
	148	ret = -EINVAL;
	149	file = fopen(path, "r");
	150	if (!file)
	151	break;
	152	ret = perf_pmu__new_alias(head, name, file);
	153	fclose(file);
	154	}
	155
	156	closedir(event_dir);
	157	return ret;
	158	}
	159
	160	/*
	161	* Reading the pmu event aliases definition, which should be located at:
	162	* /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
	163	*/
b6b96fb4	164	static int pmu_aliases(const char name, struct list_head head)
a6146d50 ZY	165	{
	166	struct stat st;
	167	char path[PATH_MAX];
cf38fada	168	const char *sysfs = sysfs__mountpoint();
a6146d50	169
a6146d50 ZY	170	if (!sysfs)
	171	return -1;
	172
	173	snprintf(path, PATH_MAX,
	174	"%s/bus/event_source/devices/%s/events", sysfs, name);
	175
	176	if (stat(path, &st) < 0)
3fded963	177	return 0; /* no error if 'events' does not exist */
a6146d50 ZY	178
	179	if (pmu_aliases_parse(path, head))
	180	return -1;
	181
	182	return 0;
	183	}
	184
5c6ccc37	185	static int pmu_alias_terms(struct perf_pmu_alias *alias,
a6146d50 ZY	186	struct list_head *terms)
a6146d50 ZY	187	{
6cee6cd3	188	struct parse_events_term term, clone;
a6146d50 ZY	189	LIST_HEAD(list);
	190	int ret;
	191
	192	list_for_each_entry(term, &alias->terms, list) {
6cee6cd3	193	ret = parse_events_term__clone(&clone, term);
a6146d50 ZY	194	if (ret) {
	195	parse_events__free_terms(&list);
	196	return ret;
	197	}
	198	list_add_tail(&clone->list, &list);
	199	}
	200	list_splice(&list, terms);
	201	return 0;
	202	}
	203
cd82a32e JO	204	/*
	205	* Reading/parsing the default pmu type value, which should be
	206	* located at:
	207	* /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
	208	*/
b6b96fb4	209	static int pmu_type(const char name, __u32 type)
cd82a32e JO	210	{
	211	struct stat st;
	212	char path[PATH_MAX];
cd82a32e JO	213	FILE *file;
cd82a32e JO	214	int ret = 0;
cf38fada	215	const char *sysfs = sysfs__mountpoint();
cd82a32e	216
cd82a32e JO	217	if (!sysfs)
	218	return -1;
	219
	220	snprintf(path, PATH_MAX,
50a9667c	221	"%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
cd82a32e JO	222
	223	if (stat(path, &st) < 0)
	224	return -1;
	225
	226	file = fopen(path, "r");
	227	if (!file)
	228	return -EINVAL;
	229
	230	if (1 != fscanf(file, "%u", type))
	231	ret = -1;
	232
	233	fclose(file);
	234	return ret;
	235	}
	236
50a9667c RR	237	/* Add all pmus in sysfs to pmu list: */
	238	static void pmu_read_sysfs(void)
	239	{
	240	char path[PATH_MAX];
50a9667c RR	241	DIR *dir;
50a9667c RR	242	struct dirent *dent;
cf38fada	243	const char *sysfs = sysfs__mountpoint();
50a9667c	244
50a9667c RR	245	if (!sysfs)
	246	return;
	247
	248	snprintf(path, PATH_MAX,
	249	"%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
	250
	251	dir = opendir(path);
	252	if (!dir)
	253	return;
	254
	255	while ((dent = readdir(dir))) {
	256	if (!strcmp(dent->d_name, ".") \|\| !strcmp(dent->d_name, ".."))
	257	continue;
	258	/* add to static LIST_HEAD(pmus): */
	259	perf_pmu__find(dent->d_name);
	260	}
	261
	262	closedir(dir);
	263	}
	264
b6b96fb4	265	static struct cpu_map pmu_cpumask(const char name)
7ae92e74 YZ	266	{
	267	struct stat st;
	268	char path[PATH_MAX];
7ae92e74 YZ	269	FILE *file;
7ae92e74 YZ	270	struct cpu_map *cpus;
cf38fada	271	const char *sysfs = sysfs__mountpoint();
7ae92e74	272
7ae92e74 YZ	273	if (!sysfs)
	274	return NULL;
	275
	276	snprintf(path, PATH_MAX,
	277	"%s/bus/event_source/devices/%s/cpumask", sysfs, name);
	278
	279	if (stat(path, &st) < 0)
	280	return NULL;
	281
	282	file = fopen(path, "r");
	283	if (!file)
	284	return NULL;
	285
	286	cpus = cpu_map__read(file);
	287	fclose(file);
	288	return cpus;
	289	}
	290
b6b96fb4	291	static struct perf_pmu pmu_lookup(const char name)
cd82a32e JO	292	{
	293	struct perf_pmu *pmu;
	294	LIST_HEAD(format);
a6146d50	295	LIST_HEAD(aliases);
cd82a32e JO	296	__u32 type;
	297
	298	/*
	299	* The pmu data we store & need consists of the pmu
	300	* type value and format definitions. Load both right
	301	* now.
	302	*/
	303	if (pmu_format(name, &format))
	304	return NULL;
	305
3fded963 JO	306	if (pmu_aliases(name, &aliases))
	307	return NULL;
	308
cd82a32e JO	309	if (pmu_type(name, &type))
	310	return NULL;
	311
	312	pmu = zalloc(sizeof(*pmu));
	313	if (!pmu)
	314	return NULL;
	315
7ae92e74 YZ	316	pmu->cpus = pmu_cpumask(name);
7ae92e74 YZ	317
cd82a32e	318	INIT_LIST_HEAD(&pmu->format);
a6146d50	319	INIT_LIST_HEAD(&pmu->aliases);
cd82a32e	320	list_splice(&format, &pmu->format);
a6146d50	321	list_splice(&aliases, &pmu->aliases);
cd82a32e JO	322	pmu->name = strdup(name);
cd82a32e JO	323	pmu->type = type;
9bc8f9fe	324	list_add_tail(&pmu->list, &pmus);
cd82a32e JO	325	return pmu;
	326	}
	327
b6b96fb4	328	static struct perf_pmu pmu_find(const char name)
cd82a32e JO	329	{
	330	struct perf_pmu *pmu;
	331
	332	list_for_each_entry(pmu, &pmus, list)
	333	if (!strcmp(pmu->name, name))
	334	return pmu;
	335
	336	return NULL;
	337	}
	338
50a9667c RR	339	struct perf_pmu perf_pmu__scan(struct perf_pmu pmu)
	340	{
	341	/*
	342	* pmu iterator: If pmu is NULL, we start at the begin,
	343	* otherwise return the next pmu. Returns NULL on end.
	344	*/
	345	if (!pmu) {
	346	pmu_read_sysfs();
	347	pmu = list_prepare_entry(pmu, &pmus, list);
	348	}
	349	list_for_each_entry_continue(pmu, &pmus, list)
	350	return pmu;
	351	return NULL;
	352	}
	353
b6b96fb4	354	struct perf_pmu perf_pmu__find(const char name)
cd82a32e JO	355	{
	356	struct perf_pmu *pmu;
	357
	358	/*
	359	* Once PMU is loaded it stays in the list,
	360	* so we keep us from multiple reading/parsing
	361	* the pmu format definitions.
	362	*/
	363	pmu = pmu_find(name);
	364	if (pmu)
	365	return pmu;
	366
	367	return pmu_lookup(name);
	368	}
	369
5c6ccc37	370	static struct perf_pmu_format *
cd82a32e JO	371	pmu_find_format(struct list_head formats, char name)
cd82a32e JO	372	{
5c6ccc37	373	struct perf_pmu_format *format;
cd82a32e JO	374
	375	list_for_each_entry(format, formats, list)
	376	if (!strcmp(format->name, name))
	377	return format;
	378
	379	return NULL;
	380	}
	381
	382	/*
	383	* Returns value based on the format definition (format parameter)
	384	* and unformated value (value parameter).
	385	*
	386	* TODO maybe optimize a little ;)
	387	*/
	388	static __u64 pmu_format_value(unsigned long *format, __u64 value)
	389	{
	390	unsigned long fbit, vbit;
	391	__u64 v = 0;
	392
	393	for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
	394
	395	if (!test_bit(fbit, format))
	396	continue;
	397
	398	if (!(value & (1llu << vbit++)))
	399	continue;
	400
	401	v \|= (1llu << fbit);
	402	}
	403
	404	return v;
	405	}
	406
	407	/*
	408	* Setup one of config[12] attr members based on the
	409	* user input data - temr parameter.
	410	*/
	411	static int pmu_config_term(struct list_head *formats,
	412	struct perf_event_attr *attr,
6cee6cd3	413	struct parse_events_term *term)
cd82a32e	414	{
5c6ccc37	415	struct perf_pmu_format *format;
cd82a32e JO	416	__u64 *vp;
	417
	418	/*
	419	* Support only for hardcoded and numnerial terms.
	420	* Hardcoded terms should be already in, so nothing
	421	* to be done for them.
	422	*/
	423	if (parse_events__is_hardcoded_term(term))
	424	return 0;
	425
16fa7e82	426	if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
cd82a32e JO	427	return -EINVAL;
	428
	429	format = pmu_find_format(formats, term->config);
	430	if (!format)
	431	return -EINVAL;
	432
	433	switch (format->value) {
	434	case PERF_PMU_FORMAT_VALUE_CONFIG:
	435	vp = &attr->config;
	436	break;
	437	case PERF_PMU_FORMAT_VALUE_CONFIG1:
	438	vp = &attr->config1;
	439	break;
	440	case PERF_PMU_FORMAT_VALUE_CONFIG2:
	441	vp = &attr->config2;
	442	break;
	443	default:
	444	return -EINVAL;
	445	}
	446
16fa7e82 JO	447	/*
	448	* XXX If we ever decide to go with string values for
	449	* non-hardcoded terms, here's the place to translate
	450	* them into value.
	451	*/
cd82a32e JO	452	*vp \|= pmu_format_value(format->bits, term->val.num);
	453	return 0;
	454	}
	455
cff7f956 JO	456	int perf_pmu__config_terms(struct list_head *formats,
	457	struct perf_event_attr *attr,
	458	struct list_head *head_terms)
cd82a32e	459	{
6cee6cd3	460	struct parse_events_term *term;
cd82a32e	461
6b5fc39b	462	list_for_each_entry(term, head_terms, list)
cd82a32e JO	463	if (pmu_config_term(formats, attr, term))
	464	return -EINVAL;
	465
	466	return 0;
	467	}
	468
	469	/*
	470	* Configures event's 'attr' parameter based on the:
	471	* 1) users input - specified in terms parameter
	472	* 2) pmu format definitions - specified by pmu parameter
	473	*/
	474	int perf_pmu__config(struct perf_pmu pmu, struct perf_event_attr attr,
	475	struct list_head *head_terms)
	476	{
	477	attr->type = pmu->type;
cff7f956	478	return perf_pmu__config_terms(&pmu->format, attr, head_terms);
cd82a32e JO	479	}
cd82a32e JO	480
5c6ccc37 ACM	481	static struct perf_pmu_alias pmu_find_alias(struct perf_pmu pmu,
5c6ccc37 ACM	482	struct parse_events_term *term)
a6146d50	483	{
5c6ccc37	484	struct perf_pmu_alias *alias;
a6146d50 ZY	485	char *name;
	486
	487	if (parse_events__is_hardcoded_term(term))
	488	return NULL;
	489
	490	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
	491	if (term->val.num != 1)
	492	return NULL;
	493	if (pmu_find_format(&pmu->format, term->config))
	494	return NULL;
	495	name = term->config;
	496	} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
	497	if (strcasecmp(term->config, "event"))
	498	return NULL;
	499	name = term->val.str;
	500	} else {
	501	return NULL;
	502	}
	503
	504	list_for_each_entry(alias, &pmu->aliases, list) {
	505	if (!strcasecmp(alias->name, name))
	506	return alias;
	507	}
	508	return NULL;
	509	}
	510
	511	/*
	512	* Find alias in the terms list and replace it with the terms
	513	* defined for the alias
	514	*/
	515	int perf_pmu__check_alias(struct perf_pmu pmu, struct list_head head_terms)
	516	{
6cee6cd3	517	struct parse_events_term term, h;
5c6ccc37	518	struct perf_pmu_alias *alias;
a6146d50 ZY	519	int ret;
	520
	521	list_for_each_entry_safe(term, h, head_terms, list) {
	522	alias = pmu_find_alias(pmu, term);
	523	if (!alias)
	524	continue;
	525	ret = pmu_alias_terms(alias, &term->list);
	526	if (ret)
	527	return ret;
	528	list_del(&term->list);
	529	free(term);
	530	}
	531	return 0;
	532	}
	533
cd82a32e JO	534	int perf_pmu__new_format(struct list_head list, char name,
	535	int config, unsigned long *bits)
	536	{
5c6ccc37	537	struct perf_pmu_format *format;
cd82a32e JO	538
	539	format = zalloc(sizeof(*format));
	540	if (!format)
	541	return -ENOMEM;
	542
	543	format->name = strdup(name);
	544	format->value = config;
	545	memcpy(format->bits, bits, sizeof(format->bits));
	546
	547	list_add_tail(&format->list, list);
	548	return 0;
	549	}
	550
	551	void perf_pmu__set_format(unsigned long *bits, long from, long to)
	552	{
	553	long b;
	554
	555	if (!to)
	556	to = from;
	557
15268138	558	memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
cd82a32e JO	559	for (b = from; b <= to; b++)
	560	set_bit(b, bits);
	561	}
dc098b35 AK	562
	563	static char format_alias(char buf, int len, struct perf_pmu *pmu,
	564	struct perf_pmu_alias *alias)
	565	{
	566	snprintf(buf, len, "%s/%s/", pmu->name, alias->name);
	567	return buf;
	568	}
	569
	570	static char format_alias_or(char buf, int len, struct perf_pmu *pmu,
	571	struct perf_pmu_alias *alias)
	572	{
	573	snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
	574	return buf;
	575	}
	576
	577	static int cmp_string(const void a, const void b)
	578	{
	579	const char * const *as = a;
	580	const char * const *bs = b;
	581	return strcmp(as, bs);
	582	}
	583
	584	void print_pmu_events(const char *event_glob, bool name_only)
	585	{
	586	struct perf_pmu *pmu;
	587	struct perf_pmu_alias *alias;
	588	char buf[1024];
	589	int printed = 0;
	590	int len, j;
	591	char **aliases;
	592
	593	pmu = NULL;
	594	len = 0;
	595	while ((pmu = perf_pmu__scan(pmu)) != NULL)
	596	list_for_each_entry(alias, &pmu->aliases, list)
	597	len++;
	598	aliases = malloc(sizeof(char ) len);
	599	if (!aliases)
	600	return;
	601	pmu = NULL;
	602	j = 0;
	603	while ((pmu = perf_pmu__scan(pmu)) != NULL)
	604	list_for_each_entry(alias, &pmu->aliases, list) {
	605	char *name = format_alias(buf, sizeof(buf), pmu, alias);
	606	bool is_cpu = !strcmp(pmu->name, "cpu");
	607
	608	if (event_glob != NULL &&
	609	!(strglobmatch(name, event_glob) \|\|
	610	(!is_cpu && strglobmatch(alias->name,
	611	event_glob))))
	612	continue;
	613	aliases[j] = name;
	614	if (is_cpu && !name_only)
	615	aliases[j] = format_alias_or(buf, sizeof(buf),
	616	pmu, alias);
	617	aliases[j] = strdup(aliases[j]);
	618	j++;
	619	}
	620	len = j;
	621	qsort(aliases, len, sizeof(char *), cmp_string);
	622	for (j = 0; j < len; j++) {
	623	if (name_only) {
	624	printf("%s ", aliases[j]);
	625	continue;
626	}
627	printf(" %-50s [Kernel PMU event]\n", aliases[j]);
628	free(aliases[j]);
629	printed++;
630	}
631	if (printed)
632	printf("\n");
633	free(aliases);
634	}
4cabc3d1 AK	635
	636	bool pmu_have_event(const char pname, const char name)
	637	{
	638	struct perf_pmu *pmu;
	639	struct perf_pmu_alias *alias;
	640
	641	pmu = NULL;
	642	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
	643	if (strcmp(pname, pmu->name))
	644	continue;
	645	list_for_each_entry(alias, &pmu->aliases, list)
	646	if (!strcmp(alias->name, name))
	647	return true;
	648	}
	649	return false;
	650	}