linux/tools/perf/util/pmu.c

567 lines
11 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(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(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(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(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(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(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(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);
}