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perf list: Add tracepoint encoding to detailed output

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The tracepoint id holds the config value and is probed in determining
what an event is. Add reading of the id so that we can display the
event encoding as:

  $ perf list --details
  ...
    alarmtimer:alarmtimer_cancel                       [Tracepoint event]
          tracepoint/config=0x18c/
  ...

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20240308001915.4060155-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2024-03-07 16:19:10 -08:00 committed by Arnaldo Carvalho de Melo
parent 2316ef5891
commit 525615ef6d
1 changed files with 26 additions and 11 deletions
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37
tools/perf/util/print-events.c
View File

@ -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>
@ -92,34 +93,48 @@ 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)
goto next_evt;
close(evt_fd);
snprintf(buf, sizeof(buf), "%s/id", evt_dirent->d_name);
io__init(&id, openat(dir_fd, buf, O_RDONLY), buf, sizeof(buf));
snprintf(evt_path, MAXPATHLEN, "%s:%s",
if (id.fd < 0)
goto next_evt;
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]);
}