perf evsel: Add accessor for tool_event

Currently tool events use a dedicated variable within the evsel. Later
changes will move this to the unused struct perf_event_attr config for
these events. Add an accessor to allow the later change to be well
typed and avoid changing all uses.
Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20240907050830.6752-4-irogers@google.com
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Yang Jihong <yangjihong@bytedance.com>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Clément Le Goffic <clement.legoffic@foss.st.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ze Gao <zegao2021@gmail.com>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Junhao He <hejunhao3@huawei.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Sun Haiyong <sunhaiyong@loongson.cn>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Xu Yang <xu.yang_2@nxp.com>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Veronika Molnarova <vmolnaro@redhat.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-perf-users@vger.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -294,14 +294,14 @@ static int read_single_counter(struct evsel *counter, int cpu_map_idx, int threa
 	 * terminates. Use the wait4 values in that case.
 	 */
 	if (err && cpu_map_idx == 0 &&
-	    (counter->tool_event == PERF_TOOL_USER_TIME ||
-	     counter->tool_event == PERF_TOOL_SYSTEM_TIME)) {
+	    (evsel__tool_event(counter) == PERF_TOOL_USER_TIME ||
+	     evsel__tool_event(counter) == PERF_TOOL_SYSTEM_TIME)) {
 		u64 val, *start_time;
 		struct perf_counts_values *count =
 			perf_counts(counter->counts, cpu_map_idx, thread);
 
 		start_time = xyarray__entry(counter->start_times, cpu_map_idx, thread);
-		if (counter->tool_event == PERF_TOOL_USER_TIME)
+		if (evsel__tool_event(counter) == PERF_TOOL_USER_TIME)
 			val = ru_stats.ru_utime_usec_stat.mean;
 		else
 			val = ru_stats.ru_stime_usec_stat.mean;

tools/perf/util/evsel.c

@@ -773,7 +773,7 @@ const char *evsel__name(struct evsel *evsel)
 
 	case PERF_TYPE_SOFTWARE:
 		if (evsel__is_tool(evsel))
-			evsel__tool_name(evsel->tool_event, bf, sizeof(bf));
+			evsel__tool_name(evsel__tool_event(evsel), bf, sizeof(bf));
 		else
 			evsel__sw_name(evsel, bf, sizeof(bf));
 		break;
@@ -811,7 +811,7 @@ const char *evsel__metric_id(const struct evsel *evsel)
 		return evsel->metric_id;
 
 	if (evsel__is_tool(evsel))
-		return perf_tool_event__to_str(evsel->tool_event);
+		return perf_tool_event__to_str(evsel__tool_event(evsel));
 
 	return "unknown";
 }
@@ -1503,8 +1503,8 @@ void evsel__exit(struct evsel *evsel)
 	evsel->per_pkg_mask = NULL;
 	zfree(&evsel->metric_events);
 	perf_evsel__object.fini(evsel);
-	if (evsel->tool_event == PERF_TOOL_SYSTEM_TIME ||
-	    evsel->tool_event == PERF_TOOL_USER_TIME)
+	if (evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME ||
+	    evsel__tool_event(evsel) == PERF_TOOL_USER_TIME)
 		xyarray__delete(evsel->start_times);
 }
 
@@ -1785,7 +1785,7 @@ static int evsel__read_tool(struct evsel *evsel, int cpu_map_idx, int thread)
 
 	count = perf_counts(evsel->counts, cpu_map_idx, thread);
 
-	switch (evsel->tool_event) {
+	switch (evsel__tool_event(evsel)) {
 	case PERF_TOOL_DURATION_TIME:
 		/*
 		 * Pretend duration_time is only on the first CPU and thread, or
@@ -1800,7 +1800,7 @@ static int evsel__read_tool(struct evsel *evsel, int cpu_map_idx, int thread)
 		break;
 	case PERF_TOOL_USER_TIME:
 	case PERF_TOOL_SYSTEM_TIME: {
-		bool system = evsel->tool_event == PERF_TOOL_SYSTEM_TIME;
+		bool system = evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME;
 
 		start_time = xyarray__entry(evsel->start_times, cpu_map_idx, thread);
 		fd = FD(evsel, cpu_map_idx, thread);
@@ -2072,8 +2072,8 @@ static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
 	    perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0)
 		return -ENOMEM;
 
-	if ((evsel->tool_event == PERF_TOOL_SYSTEM_TIME ||
-	     evsel->tool_event == PERF_TOOL_USER_TIME) &&
+	if ((evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME ||
+	     evsel__tool_event(evsel) == PERF_TOOL_USER_TIME) &&
 	    !evsel->start_times) {
 		evsel->start_times = xyarray__new(perf_cpu_map__nr(cpus), nthreads, sizeof(__u64));
 		if (!evsel->start_times)
@@ -2262,7 +2262,7 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 	int pid = -1, err, old_errno;
 	enum rlimit_action set_rlimit = NO_CHANGE;
 
-	if (evsel->tool_event == PERF_TOOL_DURATION_TIME) {
+	if (evsel__tool_event(evsel) == PERF_TOOL_DURATION_TIME) {
 		if (evsel->core.attr.sample_period) /* no sampling */
 			return -EINVAL;
 		evsel->start_time = rdclock();
@@ -2304,9 +2304,9 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 			if (!evsel->cgrp && !evsel->core.system_wide)
 				pid = perf_thread_map__pid(threads, thread);
 
-			if (evsel->tool_event == PERF_TOOL_USER_TIME ||
-			    evsel->tool_event == PERF_TOOL_SYSTEM_TIME) {
-				bool system = evsel->tool_event == PERF_TOOL_SYSTEM_TIME;
+			if (evsel__tool_event(evsel) == PERF_TOOL_USER_TIME ||
+			    evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME) {
+				bool system = evsel__tool_event(evsel) == PERF_TOOL_SYSTEM_TIME;
 				__u64 *start_time = NULL;
 
 				if (evsel->core.attr.sample_period) {

tools/perf/util/evsel.h

@@ -330,6 +330,11 @@ static inline bool evsel__is_retire_lat(const struct evsel *evsel)
 	return evsel->retire_lat;
 }
 
+static inline enum perf_tool_event evsel__tool_event(const struct evsel *evsel)
+{
+	return evsel->tool_event;
+}
+
 const char *evsel__group_name(struct evsel *evsel);
 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size);
 

tools/perf/util/stat-shadow.c

@@ -380,7 +380,7 @@ static int prepare_metric(const struct metric_expr *mexp,
 			struct stats *stats;
 			double scale;
 
-			switch (metric_events[i]->tool_event) {
+			switch (evsel__tool_event(metric_events[i])) {
 			case PERF_TOOL_DURATION_TIME:
 				stats = &walltime_nsecs_stats;
 				scale = 1e-9;