summaryrefslogtreecommitdiff
path: root/tools/perf/util/print-events.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/print-events.c')
-rw-r--r--tools/perf/util/print-events.c134
1 files changed, 53 insertions, 81 deletions
diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index 9e47712507cc..a786cbfb0ff5 100644
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -9,6 +9,7 @@
#include <unistd.h>
#include <api/fs/tracing_path.h>
+#include <api/io.h>
#include <linux/stddef.h>
#include <linux/perf_event.h>
#include <linux/zalloc.h>
@@ -28,6 +29,8 @@
#include "tracepoint.h"
#include "pfm.h"
#include "thread_map.h"
+#include "tool_pmu.h"
+#include "util.h"
#define MAX_NAME_LEN 100
@@ -37,25 +40,10 @@ static const char * const event_type_descriptors[] = {
"Software event",
"Tracepoint event",
"Hardware cache event",
- "Raw hardware event descriptor",
+ "Raw event descriptor",
"Hardware breakpoint",
};
-static const struct event_symbol event_symbols_tool[PERF_TOOL_MAX] = {
- [PERF_TOOL_DURATION_TIME] = {
- .symbol = "duration_time",
- .alias = "",
- },
- [PERF_TOOL_USER_TIME] = {
- .symbol = "user_time",
- .alias = "",
- },
- [PERF_TOOL_SYSTEM_TIME] = {
- .symbol = "system_time",
- .alias = "",
- },
-};
-
/*
* Print the events from <debugfs_mount_point>/tracing/events
*/
@@ -63,17 +51,17 @@ void print_tracepoint_events(const struct print_callbacks *print_cb __maybe_unus
{
char *events_path = get_tracing_file("events");
int events_fd = open(events_path, O_PATH);
+ struct dirent **sys_namelist = NULL;
+ int sys_items;
- put_tracing_file(events_path);
if (events_fd < 0) {
pr_err("Error: failed to open tracing events directory\n");
+ pr_err("%s: %s\n", events_path, strerror(errno));
return;
}
+ put_tracing_file(events_path);
-#ifdef HAVE_SCANDIRAT_SUPPORT
-{
- struct dirent **sys_namelist = NULL;
- int sys_items = tracing_events__scandir_alphasort(&sys_namelist);
+ sys_items = tracing_events__scandir_alphasort(&sys_namelist);
for (int i = 0; i < sys_items; i++) {
struct dirent *sys_dirent = sys_namelist[i];
@@ -92,34 +80,48 @@ void print_tracepoint_events(const struct print_callbacks *print_cb __maybe_unus
evt_items = scandirat(events_fd, sys_dirent->d_name, &evt_namelist, NULL, alphasort);
for (int j = 0; j < evt_items; j++) {
+ /*
+ * Buffer sized at twice the max filename length + 1
+ * separator + 1 \0 terminator.
+ */
+ char buf[NAME_MAX * 2 + 2];
+ /* 16 possible hex digits and 22 other characters and \0. */
+ char encoding[16 + 22];
struct dirent *evt_dirent = evt_namelist[j];
- char evt_path[MAXPATHLEN];
- int evt_fd;
+ struct io id;
+ __u64 config;
if (evt_dirent->d_type != DT_DIR ||
!strcmp(evt_dirent->d_name, ".") ||
!strcmp(evt_dirent->d_name, ".."))
goto next_evt;
- snprintf(evt_path, sizeof(evt_path), "%s/id", evt_dirent->d_name);
- evt_fd = openat(dir_fd, evt_path, O_RDONLY);
- if (evt_fd < 0)
+ snprintf(buf, sizeof(buf), "%s/id", evt_dirent->d_name);
+ io__init(&id, openat(dir_fd, buf, O_RDONLY), buf, sizeof(buf));
+
+ if (id.fd < 0)
goto next_evt;
- close(evt_fd);
- snprintf(evt_path, MAXPATHLEN, "%s:%s",
+ if (io__get_dec(&id, &config) < 0) {
+ close(id.fd);
+ goto next_evt;
+ }
+ close(id.fd);
+
+ snprintf(buf, sizeof(buf), "%s:%s",
sys_dirent->d_name, evt_dirent->d_name);
+ snprintf(encoding, sizeof(encoding), "tracepoint/config=0x%llx/", config);
print_cb->print_event(print_state,
/*topic=*/NULL,
- /*pmu_name=*/NULL,
- evt_path,
+ /*pmu_name=*/NULL, /* really "tracepoint" */
+ /*event_name=*/buf,
/*event_alias=*/NULL,
/*scale_unit=*/NULL,
/*deprecated=*/false,
"Tracepoint event",
/*desc=*/NULL,
/*long_desc=*/NULL,
- /*encoding_desc=*/NULL);
+ encoding);
next_evt:
free(evt_namelist[j]);
}
@@ -130,11 +132,6 @@ next_sys:
}
free(sys_namelist);
-}
-#else
- printf("\nWARNING: Your libc doesn't have the scandirat function, please ask its maintainers to implement it.\n"
- " As a rough fallback, please do 'ls %s' to see the available tracepoint events.\n", events_path);
-#endif
close(events_fd);
}
@@ -232,7 +229,6 @@ void print_sdt_events(const struct print_callbacks *print_cb, void *print_state)
bool is_event_supported(u8 type, u64 config)
{
bool ret = true;
- int open_return;
struct evsel *evsel;
struct perf_event_attr attr = {
.type = type,
@@ -246,20 +242,32 @@ bool is_event_supported(u8 type, u64 config)
evsel = evsel__new(&attr);
if (evsel) {
- open_return = evsel__open(evsel, NULL, tmap);
- ret = open_return >= 0;
+ ret = evsel__open(evsel, NULL, tmap) >= 0;
- if (open_return == -EACCES) {
+ if (!ret) {
/*
- * This happens if the paranoid value
+ * The event may fail to open if the paranoid value
* /proc/sys/kernel/perf_event_paranoid is set to 2
- * Re-run with exclude_kernel set; we don't do that
- * by default as some ARM machines do not support it.
- *
+ * Re-run with exclude_kernel set; we don't do that by
+ * default as some ARM machines do not support it.
*/
evsel->core.attr.exclude_kernel = 1;
ret = evsel__open(evsel, NULL, tmap) >= 0;
}
+
+ if (!ret) {
+ /*
+ * The event may fail to open if the PMU requires
+ * exclude_guest to be set (e.g. as the Apple M1 PMU
+ * requires).
+ * Re-run with exclude_guest set; we don't do that by
+ * default as it's equally legitimate for another PMU
+ * driver to require that exclude_guest is clear.
+ */
+ evsel->core.attr.exclude_guest = 1;
+ ret = evsel__open(evsel, NULL, tmap) >= 0;
+ }
+
evsel__delete(evsel);
}
@@ -319,24 +327,6 @@ int print_hwcache_events(const struct print_callbacks *print_cb, void *print_sta
return 0;
}
-void print_tool_events(const struct print_callbacks *print_cb, void *print_state)
-{
- // Start at 1 because the first enum entry means no tool event.
- for (int i = 1; i < PERF_TOOL_MAX; ++i) {
- print_cb->print_event(print_state,
- "tool",
- /*pmu_name=*/NULL,
- event_symbols_tool[i].symbol,
- event_symbols_tool[i].alias,
- /*scale_unit=*/NULL,
- /*deprecated=*/false,
- "Tool event",
- /*desc=*/NULL,
- /*long_desc=*/NULL,
- /*encoding_desc=*/NULL);
- }
-}
-
void print_symbol_events(const struct print_callbacks *print_cb, void *print_state,
unsigned int type, const struct event_symbol *syms,
unsigned int max)
@@ -395,15 +385,11 @@ void print_symbol_events(const struct print_callbacks *print_cb, void *print_sta
*/
void print_events(const struct print_callbacks *print_cb, void *print_state)
{
- char *tmp;
-
print_symbol_events(print_cb, print_state, PERF_TYPE_HARDWARE,
event_symbols_hw, PERF_COUNT_HW_MAX);
print_symbol_events(print_cb, print_state, PERF_TYPE_SOFTWARE,
event_symbols_sw, PERF_COUNT_SW_MAX);
- print_tool_events(print_cb, print_state);
-
print_hwcache_events(print_cb, print_state);
perf_pmus__print_pmu_events(print_cb, print_state);
@@ -420,21 +406,7 @@ void print_events(const struct print_callbacks *print_cb, void *print_state)
/*long_desc=*/NULL,
/*encoding_desc=*/NULL);
- if (asprintf(&tmp, "%s/t1=v1[,t2=v2,t3 ...]/modifier",
- perf_pmus__scan_core(/*pmu=*/NULL)->name) > 0) {
- print_cb->print_event(print_state,
- /*topic=*/NULL,
- /*pmu_name=*/NULL,
- tmp,
- /*event_alias=*/NULL,
- /*scale_unit=*/NULL,
- /*deprecated=*/false,
- event_type_descriptors[PERF_TYPE_RAW],
- "(see 'man perf-list' on how to encode it)",
- /*long_desc=*/NULL,
- /*encoding_desc=*/NULL);
- free(tmp);
- }
+ perf_pmus__print_raw_pmu_events(print_cb, print_state);
print_cb->print_event(print_state,
/*topic=*/NULL,
generated by cgit (git 2.34.1) at 2025-07-25 18:12:32 +0000