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// SPDX-License-Identifier: GPL-2.0
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <fcntl.h>
#include <linux/stddef.h>
#include <linux/perf_event.h>
#include <linux/zalloc.h>
#include <api/fs/fs.h>
#include <errno.h>
#include "../../../util/intel-pt.h"
#include "../../../util/intel-bts.h"
#include "../../../util/pmu.h"
#include "../../../util/fncache.h"
#define TEMPLATE_ALIAS "%s/bus/event_source/devices/%s/alias"
struct pmu_alias {
char *name;
char *alias;
struct list_head list;
};
static LIST_HEAD(pmu_alias_name_list);
static bool cached_list;
struct perf_event_attr *perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
{
#ifdef HAVE_AUXTRACE_SUPPORT
if (!strcmp(pmu->name, INTEL_PT_PMU_NAME))
return intel_pt_pmu_default_config(pmu);
if (!strcmp(pmu->name, INTEL_BTS_PMU_NAME))
pmu->selectable = true;
#endif
return NULL;
}
static void pmu_alias__delete(struct pmu_alias *pmu_alias)
{
if (!pmu_alias)
return;
zfree(&pmu_alias->name);
zfree(&pmu_alias->alias);
free(pmu_alias);
}
static struct pmu_alias *pmu_alias__new(char *name, char *alias)
{
struct pmu_alias *pmu_alias = zalloc(sizeof(*pmu_alias));
if (pmu_alias) {
pmu_alias->name = strdup(name);
if (!pmu_alias->name)
goto out_delete;
pmu_alias->alias = strdup(alias);
if (!pmu_alias->alias)
goto out_delete;
}
return pmu_alias;
out_delete:
pmu_alias__delete(pmu_alias);
return NULL;
}
static int setup_pmu_alias_list(void)
{
char path[PATH_MAX];
DIR *dir;
struct dirent *dent;
const char *sysfs = sysfs__mountpoint();
struct pmu_alias *pmu_alias;
char buf[MAX_PMU_NAME_LEN];
FILE *file;
int ret = -ENOMEM;
if (!sysfs)
return -1;
snprintf(path, PATH_MAX,
"%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
dir = opendir(path);
if (!dir)
return -errno;
while ((dent = readdir(dir))) {
if (!strcmp(dent->d_name, ".") ||
!strcmp(dent->d_name, ".."))
continue;
snprintf(path, PATH_MAX,
TEMPLATE_ALIAS, sysfs, dent->d_name);
if (!file_available(path))
continue;
file = fopen(path, "r");
if (!file)
continue;
if (!fgets(buf, sizeof(buf), file)) {
fclose(file);
continue;
}
fclose(file);
/* Remove the last '\n' */
buf[strlen(buf) - 1] = 0;
pmu_alias = pmu_alias__new(dent->d_name, buf);
if (!pmu_alias)
goto close_dir;
list_add_tail(&pmu_alias->list, &pmu_alias_name_list);
}
ret = 0;
close_dir:
closedir(dir);
return ret;
}
static char *__pmu_find_real_name(const char *name)
{
struct pmu_alias *pmu_alias;
list_for_each_entry(pmu_alias, &pmu_alias_name_list, list) {
if (!strcmp(name, pmu_alias->alias))
return pmu_alias->name;
}
return (char *)name;
}
char *pmu_find_real_name(const char *name)
{
if (cached_list)
return __pmu_find_real_name(name);
setup_pmu_alias_list();
cached_list = true;
return __pmu_find_real_name(name);
}
static char *__pmu_find_alias_name(const char *name)
{
struct pmu_alias *pmu_alias;
list_for_each_entry(pmu_alias, &pmu_alias_name_list, list) {
if (!strcmp(name, pmu_alias->name))
return pmu_alias->alias;
}
return NULL;
}
char *pmu_find_alias_name(const char *name)
{
if (cached_list)
return __pmu_find_alias_name(name);
setup_pmu_alias_list();
cached_list = true;
return __pmu_find_alias_name(name);
}
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