perf inject: Add new mmap2-buildid-all option

Add an option that allows all mmap or mmap2 events to be rewritten as
mmap2 events with build IDs.

This is similar to the existing -b/--build-ids and --buildid-all options
except instead of adding a build_id event an existing mmap/mmap2 event
is used as a template and a new mmap2 event synthesized from it.

As mmap2 events are typical this avoids the insertion of build_id
events.

Add test coverage to the pipe test.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anne Macedo <retpolanne@posteo.net>
Cc: Casey Chen <cachen@purestorage.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sun Haiyong <sunhaiyong@loongson.cn>
Link: https://lore.kernel.org/r/20240909203740.143492-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 68 insertions, 0 deletions

diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 6bb62e4e2d5d..a58444c4aed1 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -2266,6 +2266,63 @@ int perf_event__synthesize_build_id(const struct perf_tool *tool,
 
 		ev.header.size += ret;
 	}
+
+	return process(tool, &ev, sample, machine);
+}
+
+int perf_event__synthesize_mmap2_build_id(const struct perf_tool *tool,
+					  struct perf_sample *sample,
+					  struct machine *machine,
+					  perf_event__handler_t process,
+					  const struct evsel *evsel,
+					  __u16 misc,
+					  __u32 pid, __u32 tid,
+					  __u64 start, __u64 len, __u64 pgoff,
+					  const struct build_id *bid,
+					  __u32 prot, __u32 flags,
+					  const char *filename)
+{
+	union perf_event ev;
+	size_t ev_len;
+	void *array;
+	int ret;
+
+	ev_len = sizeof(ev.mmap2) - sizeof(ev.mmap2.filename) + strlen(filename) + 1;
+	ev_len = PERF_ALIGN(ev_len, sizeof(u64));
+
+	memset(&ev, 0, ev_len);
+
+	ev.mmap2.header.type = PERF_RECORD_MMAP2;
+	ev.mmap2.header.misc = misc | PERF_RECORD_MISC_MMAP_BUILD_ID;
+	ev.mmap2.header.size = ev_len;
+
+	ev.mmap2.pid = pid;
+	ev.mmap2.tid = tid;
+	ev.mmap2.start = start;
+	ev.mmap2.len = len;
+	ev.mmap2.pgoff = pgoff;
+
+	ev.mmap2.build_id_size = min(bid->size, sizeof(ev.mmap2.build_id));
+	memcpy(ev.mmap2.build_id, bid->data, ev.mmap2.build_id_size);
+
+	ev.mmap2.prot = prot;
+	ev.mmap2.flags = flags;
+
+	memcpy(ev.mmap2.filename, filename, min(strlen(filename), sizeof(ev.mmap.filename)));
+
+	array = &ev;
+	array += ev.header.size;
+	ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample);
+	if (ret < 0)
+		return ret;
+
+	if (ret & 7) {
+		pr_err("Bad id sample size %d\n", ret);
+		return -EINVAL;
+	}
+
+	ev.header.size += ret;
+
 	return process(tool, &ev, sample, machine);
 }
 
diff --git a/tools/perf/util/synthetic-events.h b/tools/perf/util/synthetic-events.h
index 795bf3e18396..b9c936b5cfeb 100644
--- a/tools/perf/util/synthetic-events.h
+++ b/tools/perf/util/synthetic-events.h
@@ -54,6 +54,17 @@ int perf_event__synthesize_build_id(const struct perf_tool *tool,
 				    __u16 misc,
 				    const struct build_id *bid,
 				    const char *filename);
+int perf_event__synthesize_mmap2_build_id(const struct perf_tool *tool,
+					  struct perf_sample *sample,
+					  struct machine *machine,
+					  perf_event__handler_t process,
+					  const struct evsel *evsel,
+					  __u16 misc,
+					  __u32 pid, __u32 tid,
+					  __u64 start, __u64 len, __u64 pgoff,
+					  const struct build_id *bid,
+					  __u32 prot, __u32 flags,
+					  const char *filename);
 int perf_event__synthesize_cpu_map(const struct perf_tool *tool, const struct perf_cpu_map *cpus, perf_event__handler_t process, struct machine *machine);
 int perf_event__synthesize_event_update_cpus(const struct perf_tool *tool, struct evsel *evsel, perf_event__handler_t process);
 int perf_event__synthesize_event_update_name(const struct perf_tool *tool, struct evsel *evsel, perf_event__handler_t process);