perf session: Add e_flags to the e_machine helper

Allow e_flags as well as e_machine to be computed using the e_machine
helper.

This isn't currently used, the argument is always NULL, but it will be
used for a new header feature.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Aditya Bodkhe <aditya.b1@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrew Jones <ajones@ventanamicro.com>
Cc: Anubhav Shelat <ashelat@redhat.com>
Cc: Anup Patel <anup@brainfault.org>
Cc: Athira Rajeev <atrajeev@linux.ibm.com>
Cc: Blake Jones <blakejones@google.com>
Cc: Chun-Tse Shao <ctshao@google.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quan Zhou <zhouquan@iscas.ac.cn>
Cc: Shimin Guo <shimin.guo@skydio.com>
Cc: Swapnil Sapkal <swapnil.sapkal@amd.com>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yunseong Kim <ysk@kzalloc.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -902,7 +902,7 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
 
 	if (kvm->duration && time_diff > kvm->duration) {
 		char decode[KVM_EVENT_NAME_LEN];
-		uint16_t e_machine = perf_session__e_machine(kvm->session);
+		uint16_t e_machine = perf_session__e_machine(kvm->session, /*e_flags=*/NULL);
 
 		kvm->events_ops->decode_key(kvm, &event->key, decode);
 		if (!skip_event(e_machine, decode)) {
@@ -1187,7 +1187,7 @@ static int cpu_isa_config(struct perf_kvm_stat *kvm)
 		return -EINVAL;
 	}
 
-	e_machine = perf_session__e_machine(kvm->session);
+	e_machine = perf_session__e_machine(kvm->session, /*e_flags=*/NULL);
 	err = cpu_isa_init(kvm, e_machine, cpuid);
 	if (err == -ENOTSUP)
 		pr_err("CPU %s is not supported.\n", cpuid);
@@ -1549,7 +1549,7 @@ out:
 static int read_events(struct perf_kvm_stat *kvm)
 {
 	int ret;
-
+	uint16_t e_machine;
 	struct perf_data file = {
 		.path  = kvm->file_name,
 		.mode  = PERF_DATA_MODE_READ,
@@ -1574,7 +1574,8 @@ static int read_events(struct perf_kvm_stat *kvm)
 		goto out_delete;
 	}
 
-	if (!register_kvm_events_ops(kvm, perf_session__e_machine(kvm->session))) {
+	e_machine = perf_session__e_machine(kvm->session, /*e_flags=*/NULL);
+	if (!register_kvm_events_ops(kvm, e_machine)) {
 		ret = -EINVAL;
 		goto out_delete;
 	}

tools/perf/builtin-report.c

@@ -448,7 +448,7 @@ static int report__setup_sample_type(struct report *rep)
 		}
 	}
 
-	callchain_param_setup(sample_type, perf_session__e_machine(session));
+	callchain_param_setup(sample_type, perf_session__e_machine(session, /*e_flags=*/NULL));
 
 	if (rep->stitch_lbr && (callchain_param.record_mode != CALLCHAIN_LBR)) {
 		ui__warning("Can't find LBR callchain. Switch off --stitch-lbr.\n"
@@ -1296,7 +1296,7 @@ static int process_attr(const struct perf_tool *tool __maybe_unused,
 	 */
 	sample_type = evlist__combined_sample_type(*pevlist);
 	session = (*pevlist)->session;
-	callchain_param_setup(sample_type, perf_session__e_machine(session));
+	callchain_param_setup(sample_type, perf_session__e_machine(session, /*e_flags=*/NULL));
 	return 0;
 }
 

tools/perf/builtin-script.c

@@ -2818,6 +2818,7 @@ static int process_attr(const struct perf_tool *tool, union perf_event *event,
 	struct perf_script *scr = container_of(tool, struct perf_script, tool);
 	struct evlist *evlist;
 	struct evsel *evsel, *pos;
+	uint16_t e_machine;
 	u64 sample_type;
 	int err;
 
@@ -2859,7 +2860,8 @@ static int process_attr(const struct perf_tool *tool, union perf_event *event,
 	 * on events sample_type.
 	 */
 	sample_type = evlist__combined_sample_type(evlist);
-	callchain_param_setup(sample_type, perf_session__e_machine(evsel__session(evsel)));
+	e_machine = perf_session__e_machine(evsel__session(evsel), /*e_flags=*/NULL);
+	callchain_param_setup(sample_type, e_machine);
 
 	/* Enable fields for callchain entries */
 	if (symbol_conf.use_callchain &&
@@ -3834,7 +3836,7 @@ static void script__setup_sample_type(struct perf_script *script)
 	struct perf_session *session = script->session;
 	u64 sample_type = evlist__combined_sample_type(session->evlist);
 
-	callchain_param_setup(sample_type, perf_session__e_machine(session));
+	callchain_param_setup(sample_type, perf_session__e_machine(session, /*e_flags=*/NULL));
 
 	if (script->stitch_lbr && (callchain_param.record_mode != CALLCHAIN_LBR)) {
 		pr_warning("Can't find LBR callchain. Switch off --stitch-lbr.\n"

tools/perf/util/evsel.c

@@ -1008,11 +1008,11 @@ int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
 	return ret;
 }
 
-uint16_t evsel__e_machine(struct evsel *evsel)
+uint16_t evsel__e_machine(struct evsel *evsel, uint32_t *e_flags)
 {
 	struct perf_session *session = evsel__session(evsel);
 
-	return session ? perf_session__e_machine(session) : EM_HOST;
+	return perf_session__e_machine(session, e_flags);
 }
 
 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
@@ -1050,7 +1050,7 @@ static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *o
 
 	if (param->record_mode == CALLCHAIN_DWARF) {
 		if (!function) {
-			uint16_t e_machine = evsel__e_machine(evsel);
+			uint16_t e_machine = evsel__e_machine(evsel, /*e_flags=*/NULL);
 
 			evsel__set_sample_bit(evsel, REGS_USER);
 			evsel__set_sample_bit(evsel, STACK_USER);

tools/perf/util/evsel.h

@@ -546,7 +546,7 @@ static inline bool evsel__is_dummy_event(struct evsel *evsel)
 
 struct perf_session *evsel__session(struct evsel *evsel);
 struct perf_env *evsel__env(struct evsel *evsel);
-uint16_t evsel__e_machine(struct evsel *evsel);
+uint16_t evsel__e_machine(struct evsel *evsel, uint32_t *e_flags);
 
 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
 

tools/perf/util/kvm-stat.c

@@ -6,15 +6,19 @@
 
 bool kvm_exit_event(struct evsel *evsel)
 {
-	return evsel__name_is(evsel, kvm_exit_trace(evsel__e_machine(evsel)));
+	uint16_t e_machine = evsel__e_machine(evsel, /*e_flags=*/NULL);
+
+	return evsel__name_is(evsel, kvm_exit_trace(e_machine));
 }
 
 void exit_event_get_key(struct evsel *evsel,
 			struct perf_sample *sample,
 			struct event_key *key)
 {
+	uint16_t e_machine = evsel__e_machine(evsel, /*e_flags=*/NULL);
+
 	key->info = 0;
-	key->key  = evsel__intval(evsel, sample, kvm_exit_reason(evsel__e_machine(evsel)));
+	key->key  = evsel__intval(evsel, sample, kvm_exit_reason(e_machine));
 }
 
 
@@ -31,7 +35,9 @@ bool exit_event_begin(struct evsel *evsel,
 
 bool kvm_entry_event(struct evsel *evsel)
 {
-	return evsel__name_is(evsel, kvm_entry_trace(evsel__e_machine(evsel)));
+	uint16_t e_machine = evsel__e_machine(evsel, /*e_flags=*/NULL);
+
+	return evsel__name_is(evsel, kvm_entry_trace(e_machine));
 }
 
 bool exit_event_end(struct evsel *evsel,

tools/perf/util/session.c

@@ -2964,27 +2964,47 @@ struct perf_env *perf_session__env(struct perf_session *session)
 	return &session->header.env;
 }
 
-static int perf_session__e_machine_cb(struct thread *thread,
-				      void *arg __maybe_unused)
+struct perf_session__e_machine_cb_args {
+	uint32_t e_flags;
+	uint16_t e_machine;
+	bool need_e_flags;
+};
+
+static int perf_session__e_machine_cb(struct thread *thread, void *_args)
 {
-	uint16_t *result = arg;
+	struct perf_session__e_machine_cb_args *args = _args;
 	struct machine *machine = maps__machine(thread__maps(thread));
 
-	*result = thread__e_machine(thread, machine, /*e_flags=*/NULL);
-	return *result != EM_NONE ? 1 : 0;
+	args->e_machine = thread__e_machine(thread, machine,
+					    args->need_e_flags ? &args->e_flags : NULL);
+	return args->e_machine != EM_NONE ? 1 : 0;
 }
 
 /*
  * Note, a machine may have mixed 32-bit and 64-bit processes and so mixed
  * e_machines. Use thread__e_machine when this matters.
  */
-uint16_t perf_session__e_machine(struct perf_session *session)
+uint16_t perf_session__e_machine(struct perf_session *session, uint32_t *e_flags)
 {
-	uint16_t e_machine = EM_NONE;
+	struct perf_session__e_machine_cb_args args = {
+		.e_machine = EM_NONE,
+		.need_e_flags = e_flags != NULL,
+	};
+
+	if (!session) {
+		/* Default to assuming a host machine. */
+		if (e_flags)
+			*e_flags = EF_HOST;
+
+		return EM_HOST;
+	}
 
 	machines__for_each_thread(&session->machines,
-					 perf_session__e_machine_cb,
-					 &e_machine);
+				  perf_session__e_machine_cb,
+				  &args);
 
-	return e_machine == EM_NONE ? EM_HOST : e_machine;
+	if (e_flags)
+		*e_flags = args.e_flags;
+
+	return args.e_machine == EM_NONE ? EM_HOST : args.e_machine;
 }

tools/perf/util/session.h

@@ -211,6 +211,6 @@ int perf_event__process_finished_round(const struct perf_tool *tool,
 				       struct ordered_events *oe);
 
 struct perf_env *perf_session__env(struct perf_session *session);
-uint16_t perf_session__e_machine(struct perf_session *session);
+uint16_t perf_session__e_machine(struct perf_session *session, uint32_t *e_flags);
 
 #endif /* __PERF_SESSION_H */