perf hists browser: Allow passing an initial hotkey

Sometimes we're in an outer code, like the main hists browser popup menu
and the user follows a suggestion about using some hotkey, and that
hotkey is really handled by hists_browser__run(), so allow for calling
it with that hotkey, making it handle it instead of waiting for the user
to press one.

Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-xv2l7i6o4urn37nv1h40ryfs@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-c2c.c

@@ -2384,7 +2384,7 @@ static int perf_c2c__browse_cacheline(struct hist_entry *he)
 	c2c_browser__update_nr_entries(browser);
 
 	while (1) {
-		key = hist_browser__run(browser, "? - help", true);
+		key = hist_browser__run(browser, "? - help", true, 0);
 
 		switch (key) {
 		case 's':
@@ -2453,7 +2453,7 @@ static int perf_c2c__hists_browse(struct hists *hists)
 	c2c_browser__update_nr_entries(browser);
 
 	while (1) {
-		key = hist_browser__run(browser, "? - help", true);
+		key = hist_browser__run(browser, "? - help", true, 0);
 
 		switch (key) {
 		case 'q':

tools/perf/ui/browsers/hists.c

@@ -672,27 +672,11 @@ static int hist_browser__title(struct hist_browser *browser, char *bf, size_t si
 	return browser->title ? browser->title(browser, bf, size) : 0;
 }
 
-int hist_browser__run(struct hist_browser *browser, const char *help,
-		      bool warn_lost_event)
+static int hist_browser__handle_hotkey(struct hist_browser *browser, bool warn_lost_event, char *title, int key)
 {
-	int key;
-	char title[160];
-	struct hist_browser_timer *hbt = browser->hbt;
-	int delay_secs = hbt ? hbt->refresh : 0;
-
-	browser->b.entries = &browser->hists->entries;
-	browser->b.nr_entries = hist_browser__nr_entries(browser);
-
-	hist_browser__title(browser, title, sizeof(title));
-
-	if (ui_browser__show(&browser->b, title, "%s", help) < 0)
-		return -1;
-
-	while (1) {
-		key = ui_browser__run(&browser->b, delay_secs);
-
 	switch (key) {
 	case K_TIMER: {
+		struct hist_browser_timer *hbt = browser->hbt;
 		u64 nr_entries;
 
 		WARN_ON_ONCE(!hbt);
@@ -700,8 +684,7 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
 		if (hbt)
 			hbt->timer(hbt->arg);
 
-			if (hist_browser__has_filter(browser) ||
-			    symbol_conf.report_hierarchy)
+		if (hist_browser__has_filter(browser) || symbol_conf.report_hierarchy)
 			hist_browser__update_nr_entries(browser);
 
 		nr_entries = hist_browser__nr_entries(browser);
@@ -717,21 +700,17 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
 
 		hist_browser__title(browser, title, sizeof(title));
 		ui_browser__show_title(&browser->b, title);
-			continue;
+		break;
 	}
 	case 'D': { /* Debug */
+		struct hist_entry *h = rb_entry(browser->b.top, struct hist_entry, rb_node);
 		static int seq;
-			struct hist_entry *h = rb_entry(browser->b.top,
-							struct hist_entry, rb_node);
+
 		ui_helpline__pop();
 		ui_helpline__fpush("%d: nr_ent=(%d,%d), etl: %d, rows=%d, idx=%d, fve: idx=%d, row_off=%d, nrows=%d",
-					   seq++, browser->b.nr_entries,
-					   browser->hists->nr_entries,
-					   browser->b.extra_title_lines,
-					   browser->b.rows,
-					   browser->b.index,
-					   browser->b.top_idx,
-					   h->row_offset, h->nr_rows);
+				   seq++, browser->b.nr_entries, browser->hists->nr_entries,
+				   browser->b.extra_title_lines, browser->b.rows,
+				   browser->b.index, browser->b.top_idx, h->row_offset, h->nr_rows);
 	}
 		break;
 	case 'C':
@@ -759,8 +738,35 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
 			break;
 		/* fall thru */
 	default:
-			goto out;
+		return -1;
 	}
+
+	return 0;
+}
+
+int hist_browser__run(struct hist_browser *browser, const char *help,
+		      bool warn_lost_event, int key)
+{
+	char title[160];
+	struct hist_browser_timer *hbt = browser->hbt;
+	int delay_secs = hbt ? hbt->refresh : 0;
+
+	browser->b.entries = &browser->hists->entries;
+	browser->b.nr_entries = hist_browser__nr_entries(browser);
+
+	hist_browser__title(browser, title, sizeof(title));
+
+	if (ui_browser__show(&browser->b, title, "%s", help) < 0)
+		return -1;
+
+	if (key && hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+		goto out;
+
+	while (1) {
+		key = ui_browser__run(&browser->b, delay_secs);
+
+		if (hist_browser__handle_hotkey(browser, warn_lost_event, title, key))
+			break;
 	}
 out:
 	ui_browser__hide(&browser->b);
@@ -2994,8 +3000,7 @@ static int perf_evsel__hists_browse(struct evsel *evsel, int nr_events,
 
 		nr_options = 0;
 
-		key = hist_browser__run(browser, helpline,
-					warn_lost_event);
+		key = hist_browser__run(browser, helpline, warn_lost_event, 0);
 
 		if (browser->he_selection != NULL) {
 			thread = hist_browser__selected_thread(browser);
@@ -3573,7 +3578,7 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
 	memset(&action, 0, sizeof(action));
 
 	while (1) {
-		key = hist_browser__run(browser, "? - help", true);
+		key = hist_browser__run(browser, "? - help", true, 0);
 
 		switch (key) {
 		case 'q':

tools/perf/ui/browsers/hists.h

@@ -34,7 +34,7 @@ struct hist_browser {
 struct hist_browser *hist_browser__new(struct hists *hists);
 void hist_browser__delete(struct hist_browser *browser);
 int hist_browser__run(struct hist_browser *browser, const char *help,
-		      bool warn_lost_event);
+		      bool warn_lost_event, int key);
 void hist_browser__init(struct hist_browser *browser,
 			struct hists *hists);
 #endif /* _PERF_UI_BROWSER_HISTS_H_ */