perf tools: Add perf_event__synthesize_id_sample()

Add perf_event__synthesize_id_sample() to enable the synthesis of
ID samples.

This is needed by perf inject. When injecting events from a guest perf.data
file, there is a possibility that the sample ID numbers conflict. In that
case, perf_event__synthesize_id_sample() can be used to re-write the ID
sample.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index fe5db4b..ed96237 100644 (file)
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -1712,6 +1712,53 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_fo
        return 0;
 }
 
+int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
+{
+       __u64 *start = array;
+
+       /*
+        * used for cross-endian analysis. See git commit 65014ab3
+        * for why this goofiness is needed.
+        */
+       union u64_swap u;
+
+       if (type & PERF_SAMPLE_TID) {
+               u.val32[0] = sample->pid;
+               u.val32[1] = sample->tid;
+               *array = u.val64;
+               array++;
+       }
+
+       if (type & PERF_SAMPLE_TIME) {
+               *array = sample->time;
+               array++;
+       }
+
+       if (type & PERF_SAMPLE_ID) {
+               *array = sample->id;
+               array++;
+       }
+
+       if (type & PERF_SAMPLE_STREAM_ID) {
+               *array = sample->stream_id;
+               array++;
+       }
+
+       if (type & PERF_SAMPLE_CPU) {
+               u.val32[0] = sample->cpu;
+               u.val32[1] = 0;
+               *array = u.val64;
+               array++;
+       }
+
+       if (type & PERF_SAMPLE_IDENTIFIER) {
+               *array = sample->id;
+               array++;
+       }
+
+       return (void *)array - (void *)start;
+}
+
 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
                                    struct evlist *evlist, struct machine *machine)
 {

diff --git a/tools/perf/util/synthetic-events.h b/tools/perf/util/synthetic-events.h
index 78a0450..b136ec3 100644 (file)
--- a/tools/perf/util/synthetic-events.h
+++ b/tools/perf/util/synthetic-events.h
@@ -55,6 +55,7 @@ int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evs
 int perf_event__synthesize_extra_kmaps(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);
 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, struct evlist *evlist, perf_event__handler_t process);
 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, struct evlist *evlist, struct machine *machine);
+int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample);
 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);
 int perf_event__synthesize_mmap_events(struct perf_tool *tool, union perf_event *event, pid_t pid, pid_t tgid, perf_event__handler_t process, struct machine *machine, bool mmap_data);
 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);