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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
#include "tp_pmu.h"
#include "pmus.h"
#include <api/fs/fs.h>
#include <api/fs/tracing_path.h>
#include <api/io_dir.h>
#include <linux/kernel.h>
#include <errno.h>
#include <string.h>
int tp_pmu__id(const char *sys, const char *name)
{
char *tp_dir = get_events_file(sys);
char path[PATH_MAX];
int id, err;
if (!tp_dir)
return -1;
scnprintf(path, PATH_MAX, "%s/%s/id", tp_dir, name);
put_events_file(tp_dir);
err = filename__read_int(path, &id);
if (err)
return err;
return id;
}
int tp_pmu__for_each_tp_event(const char *sys, void *state, tp_event_callback cb)
{
char *evt_path;
struct io_dirent64 *evt_ent;
struct io_dir evt_dir;
int ret = 0;
evt_path = get_events_file(sys);
if (!evt_path)
return -errno;
io_dir__init(&evt_dir, open(evt_path, O_CLOEXEC | O_DIRECTORY | O_RDONLY));
if (evt_dir.dirfd < 0) {
ret = -errno;
put_events_file(evt_path);
return ret;
}
put_events_file(evt_path);
while (!ret && (evt_ent = io_dir__readdir(&evt_dir))) {
if (!strcmp(evt_ent->d_name, ".")
|| !strcmp(evt_ent->d_name, "..")
|| !strcmp(evt_ent->d_name, "enable")
|| !strcmp(evt_ent->d_name, "filter"))
continue;
ret = cb(state, sys, evt_ent->d_name);
if (ret)
break;
}
close(evt_dir.dirfd);
return ret;
}
int tp_pmu__for_each_tp_sys(void *state, tp_sys_callback cb)
{
struct io_dirent64 *events_ent;
struct io_dir events_dir;
int ret = 0;
char *events_dir_path = get_tracing_file("events");
if (!events_dir_path)
return -errno;
io_dir__init(&events_dir, open(events_dir_path, O_CLOEXEC | O_DIRECTORY | O_RDONLY));
if (events_dir.dirfd < 0) {
ret = -errno;
put_events_file(events_dir_path);
return ret;
}
put_events_file(events_dir_path);
while (!ret && (events_ent = io_dir__readdir(&events_dir))) {
if (!strcmp(events_ent->d_name, ".") ||
!strcmp(events_ent->d_name, "..") ||
!strcmp(events_ent->d_name, "enable") ||
!strcmp(events_ent->d_name, "header_event") ||
!strcmp(events_ent->d_name, "header_page"))
continue;
ret = cb(state, events_ent->d_name);
if (ret)
break;
}
close(events_dir.dirfd);
return ret;
}
bool perf_pmu__is_tracepoint(const struct perf_pmu *pmu)
{
return pmu->type == PERF_TYPE_TRACEPOINT;
}
struct for_each_event_args {
void *state;
pmu_event_callback cb;
const struct perf_pmu *pmu;
};
static int for_each_event_cb(void *state, const char *sys_name, const char *evt_name)
{
struct for_each_event_args *args = state;
char name[2 * FILENAME_MAX + 2];
/* 16 possible hex digits and 22 other characters and \0. */
char encoding[16 + 22];
char *format = NULL;
size_t format_size;
struct pmu_event_info info = {
.pmu = args->pmu,
.pmu_name = args->pmu->name,
.event_type_desc = "Tracepoint event",
};
char *tp_dir = get_events_file(sys_name);
char path[PATH_MAX];
int id, err;
if (!tp_dir)
return -1;
scnprintf(path, sizeof(path), "%s/%s/id", tp_dir, evt_name);
err = filename__read_int(path, &id);
if (err == 0) {
snprintf(encoding, sizeof(encoding), "tracepoint/config=0x%x/", id);
info.encoding_desc = encoding;
}
scnprintf(path, sizeof(path), "%s/%s/format", tp_dir, evt_name);
put_events_file(tp_dir);
err = filename__read_str(path, &format, &format_size);
if (err == 0) {
info.long_desc = format;
for (size_t i = 0 ; i < format_size; i++) {
/* Swap tabs to spaces due to some rendering issues. */
if (format[i] == '\t')
format[i] = ' ';
}
}
snprintf(name, sizeof(name), "%s:%s", sys_name, evt_name);
info.name = name;
err = args->cb(args->state, &info);
free(format);
return err;
}
static int for_each_event_sys_cb(void *state, const char *sys_name)
{
return tp_pmu__for_each_tp_event(sys_name, state, for_each_event_cb);
}
int tp_pmu__for_each_event(struct perf_pmu *pmu, void *state, pmu_event_callback cb)
{
struct for_each_event_args args = {
.state = state,
.cb = cb,
.pmu = pmu,
};
return tp_pmu__for_each_tp_sys(&args, for_each_event_sys_cb);
}
static int num_events_cb(void *state, const char *sys_name __maybe_unused,
const char *evt_name __maybe_unused)
{
size_t *count = state;
(*count)++;
return 0;
}
static int num_events_sys_cb(void *state, const char *sys_name)
{
return tp_pmu__for_each_tp_event(sys_name, state, num_events_cb);
}
size_t tp_pmu__num_events(struct perf_pmu *pmu __maybe_unused)
{
size_t count = 0;
tp_pmu__for_each_tp_sys(&count, num_events_sys_cb);
return count;
}
bool tp_pmu__have_event(struct perf_pmu *pmu __maybe_unused, const char *name)
{
char *dup_name, *colon;
int id;
colon = strchr(name, ':');
if (colon == NULL)
return false;
dup_name = strdup(name);
if (!dup_name)
return false;
colon = dup_name + (colon - name);
*colon = '\0';
id = tp_pmu__id(dup_name, colon + 1);
free(dup_name);
return id >= 0;
}
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