kselftest/alsa: pcm - move more configuration to configuration files

Obtain all test parameters from the configuration files. The defaults
are defined in the pcm-test.conf file. The test count and parameters
may be variable per specific hardware.

Also, handle alt_formats field now (with the fixes in the format loop).
It replaces the original "automatic" logic which is not so universal.

The code may be further extended to skip various tests based
on the configuration hints, if the exact PCM hardware parameters
are not available for the given hardware.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-alsa-pcm-test-hacks-v4-2-5a152e65b1e1@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>

tools/testing/selftests/alsa/Makefile

@@ -14,7 +14,7 @@ TEST_GEN_PROGS := mixer-test pcm-test
 
 TEST_GEN_PROGS_EXTENDED := libatest.so
 
-TEST_FILES := conf.d
+TEST_FILES := conf.d pcm-test.conf
 
 include ../lib.mk
 

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

@@ -12,6 +12,7 @@
 
 snd_config_t *get_alsalib_config(void);
 
+snd_config_t *conf_load_from_file(const char *filename);
 void conf_load(void);
 void conf_free(void);
 snd_config_t *conf_by_card(int card);
@@ -20,5 +21,7 @@ int conf_get_count(snd_config_t *root, const char *key1, const char *key2);
 const char *conf_get_string(snd_config_t *root, const char *key1, const char *key2, const char *def);
 long conf_get_long(snd_config_t *root, const char *key1, const char *key2, long def);
 int conf_get_bool(snd_config_t *root, const char *key1, const char *key2, int def);
+void conf_get_string_array(snd_config_t *root, const char *key1, const char *key2,
+			   const char **array, int array_size, const char *def);
 
 #endif /* __ALSA_LOCAL_H */

tools/testing/selftests/alsa/conf.c

@@ -125,7 +125,7 @@ static int dump_config_tree(snd_config_t *top)
 	snd_output_close(out);
 }
 
-static snd_config_t *load(const char *filename)
+snd_config_t *conf_load_from_file(const char *filename)
 {
 	snd_config_t *dst;
 	snd_input_t *input;
@@ -235,7 +235,7 @@ static bool test_filename1(int card, const char *filename, const char *sysfs_car
 	snd_config_t *config, *sysfs_config, *card_config, *sysfs_card_config, *node;
 	snd_config_iterator_t i, next;
 
-	config = load(filename);
+	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);
@@ -446,3 +446,25 @@ int conf_get_bool(snd_config_t *root, const char *key1, const char *key2, int de
 		ksft_exit_fail_msg("key '%s'.'%s' is not an bool\n", key1, key2);
 	return !!ret;
 }
+
+void conf_get_string_array(snd_config_t *root, const char *key1, const char *key2,
+			   const char **array, int array_size, const char *def)
+{
+	snd_config_t *cfg;
+	char buf[16];
+	int ret, index;
+
+	ret = conf_get_by_keys(root, key1, key2, &cfg);
+	if (ret == -ENOENT)
+		cfg = NULL;
+	else if (ret < 0)
+		ksft_exit_fail_msg("key '%s'.'%s' search error: %s\n", key1, key2, snd_strerror(ret));
+	for (index = 0; index < array_size; index++) {
+		if (cfg == NULL) {
+			array[index] = def;
+		} else {
+			sprintf(buf, "%i", index);
+			array[index] = conf_get_string(cfg, buf, NULL, def);
+		}
+	}
+}

tools/testing/selftests/alsa/conf.d/Lenovo_ThinkPad_P1_Gen2.conf

@@ -55,6 +55,14 @@ card.hda {
 				period_size 24000
 				buffer_size 192000
 			}
+			test.time3 {
+				access RW_INTERLEAVED
+				format S16_LE
+				rate 44100
+				channels 2
+				period_size 24000
+				buffer_size 192000
+			}
 		}
 		CAPTURE {
 			# use default tests, check for the presence

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

@@ -31,7 +31,6 @@ struct pcm_data {
 	struct pcm_data *next;
 };
 
-int num_pcms = 0;
 struct pcm_data *pcm_list = NULL;
 
 int num_missing = 0;
@@ -200,7 +199,6 @@ static void find_pcms(void)
 					pcm_data->pcm_config = conf_get_subtree(card_config, key, NULL);
 					pcm_data->next = pcm_list;
 					pcm_list = pcm_data;
-					num_pcms++;
 				}
 			}
 		}
@@ -219,17 +217,15 @@ static void find_pcms(void)
 	snd_config_delete(config);
 }
 
-static void test_pcm_time1(struct pcm_data *data,
+static void test_pcm_time(struct pcm_data *data, const char *test_name, snd_config_t *pcm_cfg)
-			   const char *cfg_prefix, const char *sformat,
-			   long srate, long schannels,
-			   long speriod_size, long sbuffer_size)
 {
 	char name[64], key[128], msg[256];
 	const char *cs;
 	int i, err;
 	snd_pcm_t *handle = NULL;
 	snd_pcm_access_t access = SND_PCM_ACCESS_RW_INTERLEAVED;
-	snd_pcm_format_t format;
+	snd_pcm_format_t format, old_format;
+	const char *alt_formats[8];
 	unsigned char *samples = NULL;
 	snd_pcm_sframes_t frames;
 	long long ms;
@@ -237,27 +233,23 @@ static void test_pcm_time1(struct pcm_data *data,
 	unsigned int rrate;
 	snd_pcm_uframes_t rperiod_size, rbuffer_size, start_threshold;
 	timestamp_t tstamp;
-	bool pass = false, automatic = true;
+	bool pass = false;
 	snd_pcm_hw_params_t *hw_params;
 	snd_pcm_sw_params_t *sw_params;
 
 	snd_pcm_hw_params_alloca(&hw_params);
 	snd_pcm_sw_params_alloca(&sw_params);
 
-	cs = conf_get_string(data->pcm_config, cfg_prefix, "format", sformat);
+	cs = conf_get_string(pcm_cfg, "format", NULL, "S16_LE");
 	format = snd_pcm_format_value(cs);
 	if (format == SND_PCM_FORMAT_UNKNOWN)
 		ksft_exit_fail_msg("Wrong format '%s'\n", cs);
-	rate = conf_get_long(data->pcm_config, cfg_prefix, "rate", srate);
+	conf_get_string_array(pcm_cfg, "alt_formats", NULL,
-	channels = conf_get_long(data->pcm_config, cfg_prefix, "channels", schannels);
+				alt_formats, ARRAY_SIZE(alt_formats), NULL);
-	period_size = conf_get_long(data->pcm_config, cfg_prefix, "period_size", speriod_size);
+	rate = conf_get_long(pcm_cfg, "rate", NULL, 48000);
-	buffer_size = conf_get_long(data->pcm_config, cfg_prefix, "buffer_size", sbuffer_size);
+	channels = conf_get_long(pcm_cfg, "channels", NULL, 2);
-
+	period_size = conf_get_long(pcm_cfg, "period_size", NULL, 4096);
-	automatic = strcmp(sformat, snd_pcm_format_name(format)) == 0 &&
+	buffer_size = conf_get_long(pcm_cfg, "buffer_size", NULL, 16384);
-			srate == rate &&
-			schannels == channels &&
-			speriod_size == period_size &&
-			sbuffer_size == buffer_size;
 
 	samples = malloc((rate * channels * snd_pcm_format_physical_width(format)) / 8);
 	if (!samples)
@@ -287,16 +279,29 @@ static void test_pcm_time1(struct pcm_data *data,
 					   snd_pcm_access_name(access), snd_strerror(err));
 		goto __close;
 	}
+	i = -1;
 __format:
 	err = snd_pcm_hw_params_set_format(handle, hw_params, format);
 	if (err < 0) {
-		if (automatic && format == SND_PCM_FORMAT_S16_LE) {
+		i++;
-			format = SND_PCM_FORMAT_S32_LE;
+		if (i < ARRAY_SIZE(alt_formats) && alt_formats[i]) {
-			ksft_print_msg("%s.%d.%d.%d.%s.%s format S16_LE -> S32_LE\n",
+			old_format = format;
-					 cfg_prefix,
+			format = snd_pcm_format_value(alt_formats[i]);
-					 data->card, data->device, data->subdevice,
+			if (format != SND_PCM_FORMAT_UNKNOWN) {
-					 snd_pcm_stream_name(data->stream),
+				ksft_print_msg("%s.%d.%d.%d.%s.%s format %s -> %s\n",
-					 snd_pcm_access_name(access));
+						 test_name,
+						 data->card, data->device, data->subdevice,
+						 snd_pcm_stream_name(data->stream),
+						 snd_pcm_access_name(access),
+						 snd_pcm_format_name(old_format),
+						 snd_pcm_format_name(format));
+				samples = realloc(samples, (rate * channels *
+							    snd_pcm_format_physical_width(format)) / 8);
+				if (!samples)
+					ksft_exit_fail_msg("Out of memory\n");
+				snd_pcm_format_set_silence(format, samples, rate * channels);
+				goto __format;
+			}
 		}
 		snprintf(msg, sizeof(msg), "snd_pcm_hw_params_set_format %s: %s",
 					   snd_pcm_format_name(format), snd_strerror(err));
@@ -362,7 +367,7 @@ static void test_pcm_time1(struct pcm_data *data,
 	}
 
 	ksft_print_msg("%s.%d.%d.%d.%s hw_params.%s.%s.%ld.%ld.%ld.%ld sw_params.%ld\n",
-			 cfg_prefix,
+			 test_name,
 			 data->card, data->device, data->subdevice,
 			 snd_pcm_stream_name(data->stream),
 			 snd_pcm_access_name(access),
@@ -411,7 +416,7 @@ static void test_pcm_time1(struct pcm_data *data,
 	pass = true;
 __close:
 	ksft_test_result(pass, "%s.%d.%d.%d.%s%s%s\n",
-			 cfg_prefix,
+			 test_name,
 			 data->card, data->device, data->subdevice,
 			 snd_pcm_stream_name(data->stream),
 			 msg[0] ? " " : "", msg);
@@ -420,19 +425,35 @@ static void test_pcm_time1(struct pcm_data *data,
 		snd_pcm_close(handle);
 }
 
-#define TESTS_PER_PCM 2
-
 int main(void)
 {
 	struct pcm_data *pcm;
+	snd_config_t *global_config, *default_pcm_config, *cfg, *pcm_cfg;
+	snd_config_iterator_t i, next;
+	int num_pcm_tests = 0, num_tests;
+	const char *test_name, *test_type;
 
 	ksft_print_header();
 
+	global_config = conf_load_from_file("pcm-test.conf");
+	default_pcm_config = conf_get_subtree(global_config, "pcm", NULL);
+	if (default_pcm_config == NULL)
+		ksft_exit_fail_msg("default pcm test configuration (pcm compound) is missing\n");
+
 	conf_load();
 
 	find_pcms();
 
-	ksft_set_plan(num_missing + num_pcms * TESTS_PER_PCM);
+	for (pcm = pcm_list; pcm != NULL; pcm = pcm->next) {
+		cfg = pcm->pcm_config;
+		if (cfg == NULL)
+			cfg = default_pcm_config;
+		num_tests = conf_get_count(cfg, "test", NULL);
+		if (num_tests > 0)
+			num_pcm_tests += num_tests;
+	}
+
+	ksft_set_plan(num_missing + num_pcm_tests);
 
 	for (pcm = pcm_missing; pcm != NULL; pcm = pcm->next) {
 		ksft_test_result(false, "test.missing.%d.%d.%d.%s\n",
@@ -441,10 +462,25 @@ int main(void)
 	}
 
 	for (pcm = pcm_list; pcm != NULL; pcm = pcm->next) {
-		test_pcm_time1(pcm, "test.time1", "S16_LE", 48000, 2, 512, 4096);
+		cfg = pcm->pcm_config;
-		test_pcm_time1(pcm, "test.time2", "S16_LE", 48000, 2, 24000, 192000);
+		if (cfg == NULL)
+			cfg = default_pcm_config;
+		cfg = conf_get_subtree(cfg, "test", NULL);
+		if (cfg == NULL)
+			continue;
+		snd_config_for_each(i, next, cfg) {
+			pcm_cfg = snd_config_iterator_entry(i);
+			if (snd_config_get_id(pcm_cfg, &test_name) < 0)
+				ksft_exit_fail_msg("snd_config_get_id\n");
+			test_type = conf_get_string(pcm_cfg, "type", NULL, "time");
+			if (strcmp(test_type, "time") == 0)
+				test_pcm_time(pcm, test_name, pcm_cfg);
+			else
+				ksft_exit_fail_msg("unknown test type '%s'\n", test_type);
+		}
 	}
 
+	snd_config_delete(global_config);
 	conf_free();
 
 	ksft_exit_pass();

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

@@ -0,0 +1,16 @@
+pcm.test.time1 {
+	format S16_LE
+	alt_formats [ S32_LE ]
+	rate 48000
+	channels 2
+	period_size 512
+	buffer_size 4096
+}
+pcm.test.time2 {
+	format S16_LE
+	alt_formats [ S32_LE ]
+	rate 48000
+	channels 2
+	period_size 24000
+	buffer_size 192000
+}