kselftest/alsa: pcm-test: Report cards declared in config but missing

When parsing the configs, keep track of card configurations that match
the current system but haven't matched any card, and report those as
test failures as they represent that a card which was expected to be
present on the system is missing. This allows the configuration files to
not only be used to detect missing PCM devices (which is currently
possible) but also that the soundcard hasn't been registered at all.

Signed-off-by: Nícolas F. R. A. Prado <[e-mail]>
Reviewed-by: Jaroslav Kysela <[e-mail]>
Reviewed-by: Mark Brown <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

tools/testing/selftests/alsa/alsa-local.h

···
 void conf_get_string_array(snd_config_t *root, const char *key1, const char *key2,
 			   const char **array, int array_size, const char *def);
 
+struct card_cfg_data {
+	int card;
+	snd_config_t *config;
+	const char *filename;
+	const char *config_id;
+	struct card_cfg_data *next;
+};
+
+extern struct card_cfg_data *conf_cards;
+
 #endif /* __ALSA_LOCAL_H */

tools/testing/selftests/alsa/conf.c

···
 
 #define SYSFS_ROOT "/sys"
 
-struct card_data {
-	int card;
-	snd_config_t *config;
-	const char *filename;
-	struct card_data *next;
-};
-
-static struct card_data *conf_cards;
+struct card_cfg_data *conf_cards;
 
 static const char *alsa_config =
 "ctl.hw {\n"
···
 	return config;
 }
 
-static struct card_data *conf_data_by_card(int card, bool msg)
+static struct card_cfg_data *conf_data_by_card(int card, bool msg)
 {
-	struct card_data *conf;
+	struct card_cfg_data *conf;
 
 	for (conf = conf_cards; conf; conf = conf->next) {
 		if (conf->card == card) {
···
 	return iter > 0;
 }
 
-static bool test_filename1(int card, const char *filename, const char *sysfs_card_root)
+static void assign_card_config(int card, const char *sysfs_card_root)
 {
-	struct card_data *data, *data2;
-	snd_config_t *config, *sysfs_config, *card_config, *sysfs_card_config, *node;
-	snd_config_iterator_t i, next;
+	struct card_cfg_data *data;
+	snd_config_t *sysfs_card_config;
 
-	config = conf_load_from_file(filename);
-	if (snd_config_search(config, "sysfs", &sysfs_config) ||
-	    snd_config_get_type(sysfs_config) != SND_CONFIG_TYPE_COMPOUND)
-		ksft_exit_fail_msg("Missing global sysfs block in filename %s\n", filename);
-	if (snd_config_search(config, "card", &card_config) ||
-	    snd_config_get_type(card_config) != SND_CONFIG_TYPE_COMPOUND)
-		ksft_exit_fail_msg("Missing global card block in filename %s\n", filename);
-	if (!sysfs_match(SYSFS_ROOT, sysfs_config))
-		return false;
-	snd_config_for_each(i, next, card_config) {
-		node = snd_config_iterator_entry(i);
-		if (snd_config_search(node, "sysfs", &sysfs_card_config) ||
-		    snd_config_get_type(sysfs_card_config) != SND_CONFIG_TYPE_COMPOUND)
-			ksft_exit_fail_msg("Missing card sysfs block in filename %s\n", filename);
+	for (data = conf_cards; data; data = data->next) {
+		snd_config_search(data->config, "sysfs", &sysfs_card_config);
 		if (!sysfs_match(sysfs_card_root, sysfs_card_config))
 			continue;
-		data = malloc(sizeof(*data));
-		if (!data)
-			ksft_exit_fail_msg("Out of memory\n");
-		data2 = conf_data_by_card(card, false);
-		if (data2)
-			ksft_exit_fail_msg("Duplicate card '%s' <-> '%s'\n", filename, data2->filename);
+
 		data->card = card;
-		data->filename = filename;
-		data->config = node;
-		data->next = conf_cards;
-		conf_cards = data;
-		return true;
+		break;
 	}
-	return false;
 }
 
-static bool test_filename(const char *filename)
+static void assign_card_configs(void)
 {
 	char fn[128];
 	int card;
 
 	for (card = 0; card < 32; card++) {
 		snprintf(fn, sizeof(fn), "%s/class/sound/card%d", SYSFS_ROOT, card);
-		if (access(fn, R_OK) == 0 && test_filename1(card, filename, fn))
-			return true;
+		if (access(fn, R_OK) == 0)
+			assign_card_config(card, fn);
 	}
-	return false;
 }
 
 static int filename_filter(const struct dirent *dirent)
···
 	return 0;
 }
 
+static bool match_config(const char *filename)
+{
+	struct card_cfg_data *data;
+	snd_config_t *config, *sysfs_config, *card_config, *sysfs_card_config, *node;
+	snd_config_iterator_t i, next;
+
+	config = conf_load_from_file(filename);
+	if (snd_config_search(config, "sysfs", &sysfs_config) ||
+	    snd_config_get_type(sysfs_config) != SND_CONFIG_TYPE_COMPOUND)
+		ksft_exit_fail_msg("Missing global sysfs block in filename %s\n", filename);
+	if (snd_config_search(config, "card", &card_config) ||
+	    snd_config_get_type(card_config) != SND_CONFIG_TYPE_COMPOUND)
+		ksft_exit_fail_msg("Missing global card block in filename %s\n", filename);
+	if (!sysfs_match(SYSFS_ROOT, sysfs_config))
+		return false;
+	snd_config_for_each(i, next, card_config) {
+		node = snd_config_iterator_entry(i);
+		if (snd_config_search(node, "sysfs", &sysfs_card_config) ||
+		    snd_config_get_type(sysfs_card_config) != SND_CONFIG_TYPE_COMPOUND)
+			ksft_exit_fail_msg("Missing card sysfs block in filename %s\n", filename);
+
+		data = malloc(sizeof(*data));
+		if (!data)
+			ksft_exit_fail_msg("Out of memory\n");
+		data->filename = filename;
+		data->config = node;
+		data->card = -1;
+		if (snd_config_get_id(node, &data->config_id))
+			ksft_exit_fail_msg("snd_config_get_id failed for card\n");
+		data->next = conf_cards;
+		conf_cards = data;
+	}
+	return true;
+}
+
 void conf_load(void)
 {
 	const char *fn = "conf.d";
···
 		if (filename == NULL)
 			ksft_exit_fail_msg("Out of memory\n");
 		sprintf(filename, "%s/%s", fn, namelist[j]->d_name);
-		if (test_filename(filename))
+		if (match_config(filename))
 			filename = NULL;
 		free(filename);
 		free(namelist[j]);
 	}
 	free(namelist);
+
+	assign_card_configs();
 }
 
 void conf_free(void)
 {
-	struct card_data *conf;
+	struct card_cfg_data *conf;
 
 	while (conf_cards) {
 		conf = conf_cards;
···
 
 snd_config_t *conf_by_card(int card)
 {
-	struct card_data *conf;
+	struct card_cfg_data *conf;
 
 	conf = conf_data_by_card(card, true);
 	if (conf)

tools/testing/selftests/alsa/pcm-test.c

···
 int main(void)
 {
 	struct card_data *card;
+	struct card_cfg_data *conf;
 	struct pcm_data *pcm;
 	snd_config_t *global_config, *cfg;
 	int num_pcm_tests = 0, num_tests, num_std_pcm_tests;
···
 
 	find_pcms();
 
+	for (conf = conf_cards; conf; conf = conf->next)
+		if (conf->card < 0)
+			num_missing++;
+
 	num_std_pcm_tests = conf_get_count(default_pcm_config, "test", NULL);
 
 	for (pcm = pcm_list; pcm != NULL; pcm = pcm->next) {
···
 	}
 
 	ksft_set_plan(num_missing + num_pcm_tests);
+
+	for (conf = conf_cards; conf; conf = conf->next)
+		if (conf->card < 0)
+			ksft_test_result_fail("test.missing.%s.%s\n",
+					      conf->filename, conf->config_id);
 
 	for (pcm = pcm_missing; pcm != NULL; pcm = pcm->next) {
 		ksft_test_result(false, "test.missing.%d.%d.%d.%s\n",