libperf: Move 'idx' from tools/perf to perf_evsel::idx

Move evsel::idx to perf_evsel::idx, so we can move the group interface
to libperf.

Committer notes:

Fixup evsel->idx usage in tools/perf/util/bpf_counter_cgroup.c, that
appeared in my tree in my local tree.

Also fixed up these:

$ find tools/perf/ -name "*.[ch]" | xargs grep 'evsel->idx'
tools/perf/ui/gtk/annotate.c:                      evsel->idx + i);
tools/perf/ui/gtk/annotate.c:                   evsel->idx);
$

That running 'make -C tools/perf build-test' caught.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Requested-by: Shunsuke Nakamura <nakamura.shun@fujitsu.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210706151704.73662-3-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/perf/evlist.c

@@ -66,6 +66,7 @@ static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
 void perf_evlist__add(struct perf_evlist *evlist,
 		      struct perf_evsel *evsel)
 {
+	evsel->idx = evlist->nr_entries;
 	list_add_tail(&evsel->node, &evlist->entries);
 	evlist->nr_entries += 1;
 	__perf_evlist__propagate_maps(evlist, evsel);

tools/lib/perf/evsel.c

@@ -18,18 +18,20 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 
-void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr)
+void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
+		      int idx)
 {
 	INIT_LIST_HEAD(&evsel->node);
 	evsel->attr = *attr;
+	evsel->idx  = idx;
 }
 
 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
 {
 	struct perf_evsel *evsel = zalloc(sizeof(*evsel));
 
 	if (evsel != NULL)
-		perf_evsel__init(evsel, attr);
+		perf_evsel__init(evsel, attr, 0);
 
 	return evsel;
 }

tools/lib/perf/include/internal/evsel.h

@@ -49,9 +49,11 @@ struct perf_evsel {
 	/* parse modifier helper */
 	int			 nr_members;
 	bool			 system_wide;
+	int			 idx;
 };
 
-void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr);
+void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
+		      int idx);
 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
 void perf_evsel__close_fd(struct perf_evsel *evsel);
 void perf_evsel__free_fd(struct perf_evsel *evsel);

tools/perf/arch/x86/util/iostat.c

@@ -322,7 +322,7 @@ static int iostat_event_group(struct evlist *evl,
 	}
 
 	evlist__for_each_entry(evl, evsel) {
-		evsel->priv = list->rps[evsel->idx / metrics_count];
+		evsel->priv = list->rps[evsel->core.idx / metrics_count];
 	}
 	list->nr_entries = 0;
 err:
@@ -428,7 +428,7 @@ void iostat_print_metric(struct perf_stat_config *config, struct evsel *evsel,
 {
 	double iostat_value = 0;
 	u64 prev_count_val = 0;
-	const char *iostat_metric = iostat_metric_by_idx(evsel->idx);
+	const char *iostat_metric = iostat_metric_by_idx(evsel->core.idx);
 	u8 die = ((struct iio_root_port *)evsel->priv)->die;
 	struct perf_counts_values *count = perf_counts(evsel->counts, die, 0);
 

tools/perf/builtin-diff.c

@@ -1031,12 +1031,12 @@ static int process_base_stream(struct data__file *data_base,
 			continue;
 
 		es_base = evsel_streams__entry(data_base->evlist_streams,
-					       evsel_base->idx);
+					       evsel_base->core.idx);
 		if (!es_base)
 			return -1;
 
 		es_pair = evsel_streams__entry(data_pair->evlist_streams,
-					       evsel_pair->idx);
+					       evsel_pair->core.idx);
 		if (!es_pair)
 			return -1;
 

tools/perf/builtin-report.c

@@ -332,7 +332,7 @@ static int process_read_event(struct perf_tool *tool,
 		const char *name = evsel__name(evsel);
 		int err = perf_read_values_add_value(&rep->show_threads_values,
 					   event->read.pid, event->read.tid,
-					   evsel->idx,
+					   evsel->core.idx,
 					   name,
 					   event->read.value);
 
@@ -666,7 +666,7 @@ static int report__collapse_hists(struct report *rep)
 	evlist__for_each_entry(rep->session->evlist, pos) {
 		struct hists *hists = evsel__hists(pos);
 
-		if (pos->idx == 0)
+		if (pos->core.idx == 0)
 			hists->symbol_filter_str = rep->symbol_filter_str;
 
 		hists->socket_filter = rep->socket_filter;

tools/perf/builtin-top.c

@@ -264,9 +264,9 @@ static void perf_top__show_details(struct perf_top *top)
 
 	if (top->evlist->enabled) {
 		if (top->zero)
-			symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
+			symbol__annotate_zero_histogram(symbol, top->sym_evsel->core.idx);
 		else
-			symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
+			symbol__annotate_decay_histogram(symbol, top->sym_evsel->core.idx);
 	}
 	if (more != 0)
 		printf("%d lines not displayed, maybe increase display entries [e]\n", more);
@@ -530,7 +530,7 @@ static bool perf_top__handle_keypress(struct perf_top *top, int c)
 				fprintf(stderr, "\nAvailable events:");
 
 				evlist__for_each_entry(top->evlist, top->sym_evsel)
-					fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, evsel__name(top->sym_evsel));
+					fprintf(stderr, "\n\t%d %s", top->sym_evsel->core.idx, evsel__name(top->sym_evsel));
 
 				prompt_integer(&counter, "Enter details event counter");
 
@@ -541,7 +541,7 @@ static bool perf_top__handle_keypress(struct perf_top *top, int c)
 					break;
 				}
 				evlist__for_each_entry(top->evlist, top->sym_evsel)
-					if (top->sym_evsel->idx == counter)
+					if (top->sym_evsel->core.idx == counter)
 						break;
 			} else
 				top->sym_evsel = evlist__first(top->evlist);

tools/perf/tests/evsel-roundtrip-name.c

@@ -44,7 +44,7 @@ static int perf_evsel__roundtrip_cache_name_test(void)
 
 			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
 				__evsel__hw_cache_type_op_res_name(type, op, i, name, sizeof(name));
-				if (evsel->idx != idx)
+				if (evsel->core.idx != idx)
 					continue;
 
 				++idx;
@@ -84,9 +84,9 @@ static int __perf_evsel__name_array_test(const char *names[], int nr_names,
 
 	err = 0;
 	evlist__for_each_entry(evlist, evsel) {
-		if (strcmp(evsel__name(evsel), names[evsel->idx / distance])) {
+		if (strcmp(evsel__name(evsel), names[evsel->core.idx / distance])) {
 			--err;
-			pr_debug("%s != %s\n", evsel__name(evsel), names[evsel->idx / distance]);
+			pr_debug("%s != %s\n", evsel__name(evsel), names[evsel->core.idx / distance]);
 		}
 	}
 

tools/perf/tests/mmap-basic.c

@@ -139,18 +139,18 @@ int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unuse
 				 " doesn't map to an evsel\n", sample.id);
 			goto out_delete_evlist;
 		}
-		nr_events[evsel->idx]++;
+		nr_events[evsel->core.idx]++;
 		perf_mmap__consume(&md->core);
 	}
 	perf_mmap__read_done(&md->core);
 
 out_init:
 	err = 0;
 	evlist__for_each_entry(evlist, evsel) {
-		if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
+		if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) {
 			pr_debug("expected %d %s events, got %d\n",
-				 expected_nr_events[evsel->idx],
-				 evsel__name(evsel), nr_events[evsel->idx]);
+				 expected_nr_events[evsel->core.idx],
+				 evsel__name(evsel), nr_events[evsel->core.idx]);
 			err = -1;
 			goto out_delete_evlist;
 		}

tools/perf/ui/browsers/annotate.c

@@ -749,7 +749,7 @@ static int annotate_browser__run(struct annotate_browser *browser,
 				hbt->timer(hbt->arg);
 
 			if (delay_secs != 0) {
-				symbol__annotate_decay_histogram(sym, evsel->idx);
+				symbol__annotate_decay_histogram(sym, evsel->core.idx);
 				hists__scnprintf_title(hists, title, sizeof(title));
 				annotate_browser__show(&browser->b, title, help);
 			}

tools/perf/ui/gtk/annotate.c

@@ -135,12 +135,12 @@ static int perf_gtk__annotate_symbol(GtkWidget *window, struct map_symbol *ms,
 				ret += perf_gtk__get_percent(s + ret,
 							     sizeof(s) - ret,
 							     sym, pos,
-							     evsel->idx + i);
+							     evsel->core.idx + i);
 				ret += scnprintf(s + ret, sizeof(s) - ret, " ");
 			}
 		} else {
 			ret = perf_gtk__get_percent(s, sizeof(s), sym, pos,
-						    evsel->idx);
+						    evsel->core.idx);
 		}
 
 		if (ret)

tools/perf/util/annotate.c

@@ -961,7 +961,7 @@ static int symbol__inc_addr_samples(struct map_symbol *ms,
 	if (sym == NULL)
 		return 0;
 	src = symbol__hists(sym, evsel->evlist->core.nr_entries);
-	return src ? __symbol__inc_addr_samples(ms, src, evsel->idx, addr, sample) : 0;
+	return src ? __symbol__inc_addr_samples(ms, src, evsel->core.idx, addr, sample) : 0;
 }
 
 static int symbol__account_cycles(u64 addr, u64 start,
@@ -2159,7 +2159,7 @@ static void annotation__calc_percent(struct annotation *notes,
 
 			BUG_ON(i >= al->data_nr);
 
-			sym_hist = annotation__histogram(notes, evsel->idx);
+			sym_hist = annotation__histogram(notes, evsel->core.idx);
 			data = &al->data[i++];
 
 			calc_percent(sym_hist, hists, data, al->offset, end);
@@ -2340,7 +2340,7 @@ static void print_summary(struct rb_root *root, const char *filename)
 static void symbol__annotate_hits(struct symbol *sym, struct evsel *evsel)
 {
 	struct annotation *notes = symbol__annotation(sym);
-	struct sym_hist *h = annotation__histogram(notes, evsel->idx);
+	struct sym_hist *h = annotation__histogram(notes, evsel->core.idx);
 	u64 len = symbol__size(sym), offset;
 
 	for (offset = 0; offset < len; ++offset)
@@ -2373,7 +2373,7 @@ int symbol__annotate_printf(struct map_symbol *ms, struct evsel *evsel,
 	const char *d_filename;
 	const char *evsel_name = evsel__name(evsel);
 	struct annotation *notes = symbol__annotation(sym);
-	struct sym_hist *h = annotation__histogram(notes, evsel->idx);
+	struct sym_hist *h = annotation__histogram(notes, evsel->core.idx);
 	struct annotation_line *pos, *queue = NULL;
 	u64 start = map__rip_2objdump(map, sym->start);
 	int printed = 2, queue_len = 0, addr_fmt_width;

tools/perf/util/bpf_counter_cgroup.c

@@ -124,7 +124,7 @@ static int bperf_load_program(struct evlist *evlist)
 			map_fd = bpf_map__fd(skel->maps.events);
 			for (cpu = 0; cpu < nr_cpus; cpu++) {
 				int fd = FD(evsel, cpu);
-				__u32 idx = evsel->idx * total_cpus +
+				__u32 idx = evsel->core.idx * total_cpus +
 					evlist->core.all_cpus->map[cpu];
 
 				err = bpf_map_update_elem(map_fd, &idx, &fd,
@@ -221,7 +221,7 @@ static int bperf_cgrp__sync_counters(struct evlist *evlist)
 
 static int bperf_cgrp__enable(struct evsel *evsel)
 {
-	if (evsel->idx)
+	if (evsel->core.idx)
 		return 0;
 
 	bperf_cgrp__sync_counters(evsel->evlist);
@@ -232,7 +232,7 @@ static int bperf_cgrp__enable(struct evsel *evsel)
 
 static int bperf_cgrp__disable(struct evsel *evsel)
 {
-	if (evsel->idx)
+	if (evsel->core.idx)
 		return 0;
 
 	bperf_cgrp__sync_counters(evsel->evlist);
@@ -251,7 +251,7 @@ static int bperf_cgrp__read(struct evsel *evsel)
 	int reading_map_fd, err = 0;
 	__u32 idx;
 
-	if (evsel->idx)
+	if (evsel->core.idx)
 		return 0;
 
 	bperf_cgrp__sync_counters(evsel->evlist);
@@ -263,7 +263,7 @@ static int bperf_cgrp__read(struct evsel *evsel)
 	reading_map_fd = bpf_map__fd(skel->maps.cgrp_readings);
 
 	evlist__for_each_entry(evlist, evsel) {
-		idx = evsel->idx;
+		idx = evsel->core.idx;
 		err = bpf_map_lookup_elem(reading_map_fd, &idx, values);
 		if (err) {
 			pr_err("bpf map lookup falied: idx=%u, event=%s, cgrp=%s\n",
@@ -288,7 +288,7 @@ static int bperf_cgrp__read(struct evsel *evsel)
 
 static int bperf_cgrp__destroy(struct evsel *evsel)
 {
-	if (evsel->idx)
+	if (evsel->core.idx)
 		return 0;
 
 	bperf_cgroup_bpf__destroy(skel);

tools/perf/util/evlist.c

@@ -165,11 +165,9 @@ void evlist__delete(struct evlist *evlist)
 
 void evlist__add(struct evlist *evlist, struct evsel *entry)
 {
-	entry->evlist = evlist;
-	entry->idx = evlist->core.nr_entries;
-	entry->tracking = !entry->idx;
-
 	perf_evlist__add(&evlist->core, &entry->core);
+	entry->evlist = evlist;
+	entry->tracking = !entry->core.idx;
 
 	if (evlist->core.nr_entries == 1)
 		evlist__set_id_pos(evlist);
@@ -232,7 +230,7 @@ void __evlist__set_leader(struct list_head *list)
 	leader = list_entry(list->next, struct evsel, core.node);
 	evsel = list_entry(list->prev, struct evsel, core.node);
 
-	leader->core.nr_members = evsel->idx - leader->idx + 1;
+	leader->core.nr_members = evsel->core.idx - leader->core.idx + 1;
 
 	__evlist__for_each_entry(list, evsel) {
 		evsel->leader = leader;
@@ -2137,7 +2135,7 @@ struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
 	struct evsel *evsel;
 
 	evlist__for_each_entry(evlist, evsel) {
-		if (evsel->idx == idx)
+		if (evsel->core.idx == idx)
 			return evsel;
 	}
 	return NULL;

tools/perf/util/evsel.c

@@ -239,8 +239,7 @@ bool evsel__is_function_event(struct evsel *evsel)
 void evsel__init(struct evsel *evsel,
 		 struct perf_event_attr *attr, int idx)
 {
-	perf_evsel__init(&evsel->core, attr);
-	evsel->idx	   = idx;
+	perf_evsel__init(&evsel->core, attr, idx);
 	evsel->tracking	   = !idx;
 	evsel->leader	   = evsel;
 	evsel->unit	   = "";

tools/perf/util/evsel.h

@@ -49,7 +49,6 @@ struct evsel {
 	struct perf_evsel	core;
 	struct evlist		*evlist;
 	off_t			id_offset;
-	int			idx;
 	int			id_pos;
 	int			is_pos;
 	unsigned int		sample_size;
@@ -406,7 +405,7 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
 
 static inline int evsel__group_idx(struct evsel *evsel)
 {
-	return evsel->idx - evsel->leader->idx;
+	return evsel->core.idx - evsel->leader->core.idx;
 }
 
 /* Iterates group WITHOUT the leader. */

tools/perf/util/header.c

@@ -789,7 +789,7 @@ static int write_group_desc(struct feat_fd *ff,
 	evlist__for_each_entry(evlist, evsel) {
 		if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {
 			const char *name = evsel->group_name ?: "{anon_group}";
-			u32 leader_idx = evsel->idx;
+			u32 leader_idx = evsel->core.idx;
 			u32 nr_members = evsel->core.nr_members;
 
 			ret = do_write_string(ff, name);
@@ -1844,7 +1844,7 @@ static struct evsel *read_event_desc(struct feat_fd *ff)
 		msz = sz;
 
 	for (i = 0, evsel = events; i < nre; evsel++, i++) {
-		evsel->idx = i;
+		evsel->core.idx = i;
 
 		/*
 		 * must read entire on-file attr struct to
@@ -2379,7 +2379,7 @@ static struct evsel *evlist__find_by_index(struct evlist *evlist, int idx)
 	struct evsel *evsel;
 
 	evlist__for_each_entry(evlist, evsel) {
-		if (evsel->idx == idx)
+		if (evsel->core.idx == idx)
 			return evsel;
 	}
 
@@ -2393,7 +2393,7 @@ static void evlist__set_event_name(struct evlist *evlist, struct evsel *event)
 	if (!event->name)
 		return;
 
-	evsel = evlist__find_by_index(evlist, event->idx);
+	evsel = evlist__find_by_index(evlist, event->core.idx);
 	if (!evsel)
 		return;
 
@@ -2739,7 +2739,7 @@ static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
 
 	i = nr = 0;
 	evlist__for_each_entry(session->evlist, evsel) {
-		if (evsel->idx == (int) desc[i].leader_idx) {
+		if (evsel->core.idx == (int) desc[i].leader_idx) {
 			evsel->leader = evsel;
 			/* {anon_group} is a dummy name */
 			if (strcmp(desc[i].name, "{anon_group}")) {