![Andi Kleen](/assets/img/avatar_default.png)
List the kernel supplied pmu event aliases in perf list It's better when the users can actually see them. Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1366480949-32292-2-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
640 lines
13 KiB
C
640 lines
13 KiB
C
#include <linux/list.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <dirent.h>
|
|
#include "sysfs.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 = sysfs_find_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 = 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 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];
|
|
const char *sysfs;
|
|
FILE *file;
|
|
int ret = 0;
|
|
|
|
sysfs = sysfs_find_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];
|
|
const char *sysfs;
|
|
DIR *dir;
|
|
struct dirent *dent;
|
|
|
|
sysfs = sysfs_find_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];
|
|
const char *sysfs;
|
|
FILE *file;
|
|
struct cpu_map *cpus;
|
|
|
|
sysfs = sysfs_find_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);
|
|
}
|