// SPDX-License-Identifier: GPL-2.0
/*
* This is the test which covers PCM middle layer data transferring using
* the virtual pcm test driver (snd-pcmtest).
*
* Copyright 2023 Ivan Orlov <[email protected]>
*/
#include <string.h>
#include <alsa/asoundlib.h>
#include "../kselftest_harness.h"
#define CH_NUM 4
struct pattern_buf {
char buf[1024];
int len;
};
struct pattern_buf patterns[CH_NUM];
struct pcmtest_test_params {
unsigned long buffer_size;
unsigned long period_size;
unsigned long channels;
unsigned int rate;
snd_pcm_access_t access;
size_t sec_buf_len;
size_t sample_size;
int time;
snd_pcm_format_t format;
};
static int read_patterns(void)
{
FILE *fp, *fpl;
int i;
char pf[64];
char plf[64];
for (i = 0; i < CH_NUM; i++) {
sprintf(plf, "/sys/kernel/debug/pcmtest/fill_pattern%d_len", i);
fpl = fopen(plf, "r");
if (!fpl)
return -1;
fscanf(fpl, "%u", &patterns[i].len);
fclose(fpl);
sprintf(pf, "/sys/kernel/debug/pcmtest/fill_pattern%d", i);
fp = fopen(pf, "r");
if (!fp)
return -1;
fread(patterns[i].buf, 1, patterns[i].len, fp);
fclose(fp);
}
return 0;
}
static int get_test_results(char *debug_name)
{
int result;
FILE *f;
char fname[128];
sprintf(fname, "/sys/kernel/debug/pcmtest/%s", debug_name);
f = fopen(fname, "r");
if (!f) {
printf("Failed to open file\n");
return -1;
}
fscanf(f, "%d", &result);
fclose(f);
return result;
}
static size_t get_sec_buf_len(unsigned int rate, unsigned long channels, snd_pcm_format_t format)
{
return rate * channels * snd_pcm_format_physical_width(format) / 8;
}
static int setup_handle(snd_pcm_t **handle, snd_pcm_sw_params_t *swparams,
snd_pcm_hw_params_t *hwparams, struct pcmtest_test_params *params,
int card, snd_pcm_stream_t stream)
{
char pcm_name[32];
int err;
sprintf(pcm_name, "hw:%d,0,0", card);
err = snd_pcm_open(handle, pcm_name, stream, 0);
if (err < 0)
return err;
snd_pcm_hw_params_any(*handle, hwparams);
snd_pcm_hw_params_set_rate_resample(*handle, hwparams, 0);
snd_pcm_hw_params_set_access(*handle, hwparams, params->access);
snd_pcm_hw_params_set_format(*handle, hwparams, params->format);
snd_pcm_hw_params_set_channels(*handle, hwparams, params->channels);
snd_pcm_hw_params_set_rate_near(*handle, hwparams, ¶ms->rate, 0);
snd_pcm_hw_params_set_period_size_near(*handle, hwparams, ¶ms->period_size, 0);
snd_pcm_hw_params_set_buffer_size_near(*handle, hwparams, ¶ms->buffer_size);
snd_pcm_hw_params(*handle, hwparams);
snd_pcm_sw_params_current(*handle, swparams);
snd_pcm_hw_params_set_rate_resample(*handle, hwparams, 0);
snd_pcm_sw_params_set_avail_min(*handle, swparams, params->period_size);
snd_pcm_hw_params_set_buffer_size_near(*handle, hwparams, ¶ms->buffer_size);
snd_pcm_hw_params_set_period_size_near(*handle, hwparams, ¶ms->period_size, 0);
snd_pcm_sw_params(*handle, swparams);
snd_pcm_hw_params(*handle, hwparams);
return 0;
}
FIXTURE(pcmtest) {
int card;
snd_pcm_sw_params_t *swparams;
snd_pcm_hw_params_t *hwparams;
struct pcmtest_test_params params;
};
FIXTURE_TEARDOWN(pcmtest) {
}
FIXTURE_SETUP(pcmtest) {
char *card_name;
int err;
if (geteuid())
SKIP(return, "This test needs root to run!");
err = read_patterns();
if (err)
SKIP(return, "Can't read patterns. Probably, module isn't loaded");
card_name = malloc(127);
ASSERT_NE(card_name, NULL);
self->params.buffer_size = 16384;
self->params.period_size = 4096;
self->params.channels = CH_NUM;
self->params.rate = 8000;
self->params.access = SND_PCM_ACCESS_RW_INTERLEAVED;
self->params.format = SND_PCM_FORMAT_S16_LE;
self->card = -1;
self->params.sample_size = snd_pcm_format_physical_width(self->params.format) / 8;
self->params.sec_buf_len = get_sec_buf_len(self->params.rate, self->params.channels,
self->params.format);
self->params.time = 4;
while (snd_card_next(&self->card) >= 0) {
if (self->card == -1)
break;
snd_card_get_name(self->card, &card_name);
if (!strcmp(card_name, "PCM-Test"))
break;
}
free(card_name);
ASSERT_NE(self->card, -1);
}
/*
* Here we are trying to send the looped monotonically increasing sequence of bytes to the driver.
* If our data isn't corrupted, the driver will set the content of 'pc_test' debugfs file to '1'
*/
TEST_F(pcmtest, playback) {
snd_pcm_t *handle;
unsigned char *it;
size_t write_res;
int test_results;
int i, cur_ch, pos_in_ch;
void *samples;
struct pcmtest_test_params *params = &self->params;
samples = calloc(self->params.sec_buf_len * self->params.time, 1);
ASSERT_NE(samples, NULL);
snd_pcm_sw_params_alloca(&self->swparams);
snd_pcm_hw_params_alloca(&self->hwparams);
ASSERT_EQ(setup_handle(&handle, self->swparams, self->hwparams, params,
self->card, SND_PCM_STREAM_PLAYBACK), 0);
snd_pcm_format_set_silence(params->format, samples,
params->rate * params->channels * params->time);
it = samples;
for (i = 0; i < self->params.sec_buf_len * params->time; i++) {
cur_ch = (i / params->sample_size) % CH_NUM;
pos_in_ch = i / params->sample_size / CH_NUM * params->sample_size
+ (i % params->sample_size);
it[i] = patterns[cur_ch].buf[pos_in_ch % patterns[cur_ch].len];
}
write_res = snd_pcm_writei(handle, samples, params->rate * params->time);
ASSERT_GE(write_res, 0);
snd_pcm_close(handle);
free(samples);
test_results = get_test_results("pc_test");
ASSERT_EQ(test_results, 1);
}
/*
* Here we test that the virtual alsa driver returns looped and monotonically increasing sequence
* of bytes. In the interleaved mode the buffer will contain samples in the following order:
* C0, C1, C2, C3, C0, C1, ...
*/
TEST_F(pcmtest, capture) {
snd_pcm_t *handle;
unsigned char *it;
size_t read_res;
int i, cur_ch, pos_in_ch;
void *samples;
struct pcmtest_test_params *params = &self->params;
samples = calloc(self->params.sec_buf_len * self->params.time, 1);
ASSERT_NE(samples, NULL);
snd_pcm_sw_params_alloca(&self->swparams);
snd_pcm_hw_params_alloca(&self->hwparams);
ASSERT_EQ(setup_handle(&handle, self->swparams, self->hwparams,
params, self->card, SND_PCM_STREAM_CAPTURE), 0);
snd_pcm_format_set_silence(params->format, samples,
params->rate * params->channels * params->time);
read_res = snd_pcm_readi(handle, samples, params->rate * params->time);
ASSERT_GE(read_res, 0);
snd_pcm_close(handle);
it = (unsigned char *)samples;
for (i = 0; i < self->params.sec_buf_len * self->params.time; i++) {
cur_ch = (i / params->sample_size) % CH_NUM;
pos_in_ch = i / params->sample_size / CH_NUM * params->sample_size
+ (i % params->sample_size);
ASSERT_EQ(it[i], patterns[cur_ch].buf[pos_in_ch % patterns[cur_ch].len]);
}
free(samples);
}
// Test capture in the non-interleaved access mode. The are buffers for each recorded channel
TEST_F(pcmtest, ni_capture) {
snd_pcm_t *handle;
struct pcmtest_test_params params = self->params;
char **chan_samples;
size_t i, j, read_res;
chan_samples = calloc(CH_NUM, sizeof(*chan_samples));
ASSERT_NE(chan_samples, NULL);
snd_pcm_sw_params_alloca(&self->swparams);
snd_pcm_hw_params_alloca(&self->hwparams);
params.access = SND_PCM_ACCESS_RW_NONINTERLEAVED;
ASSERT_EQ(setup_handle(&handle, self->swparams, self->hwparams,
¶ms, self->card, SND_PCM_STREAM_CAPTURE), 0);
for (i = 0; i < CH_NUM; i++)
chan_samples[i] = calloc(params.sec_buf_len * params.time, 1);
for (i = 0; i < 1; i++) {
read_res = snd_pcm_readn(handle, (void **)chan_samples, params.rate * params.time);
ASSERT_GE(read_res, 0);
}
snd_pcm_close(handle);
for (i = 0; i < CH_NUM; i++) {
for (j = 0; j < params.rate * params.time; j++)
ASSERT_EQ(chan_samples[i][j], patterns[i].buf[j % patterns[i].len]);
free(chan_samples[i]);
}
free(chan_samples);
}
TEST_F(pcmtest, ni_playback) {
snd_pcm_t *handle;
struct pcmtest_test_params params = self->params;
char **chan_samples;
size_t i, j, read_res;
int test_res;
chan_samples = calloc(CH_NUM, sizeof(*chan_samples));
ASSERT_NE(chan_samples, NULL);
snd_pcm_sw_params_alloca(&self->swparams);
snd_pcm_hw_params_alloca(&self->hwparams);
params.access = SND_PCM_ACCESS_RW_NONINTERLEAVED;
ASSERT_EQ(setup_handle(&handle, self->swparams, self->hwparams,
¶ms, self->card, SND_PCM_STREAM_PLAYBACK), 0);
for (i = 0; i < CH_NUM; i++) {
chan_samples[i] = calloc(params.sec_buf_len * params.time, 1);
for (j = 0; j < params.sec_buf_len * params.time; j++)
chan_samples[i][j] = patterns[i].buf[j % patterns[i].len];
}
for (i = 0; i < 1; i++) {
read_res = snd_pcm_writen(handle, (void **)chan_samples, params.rate * params.time);
ASSERT_GE(read_res, 0);
}
snd_pcm_close(handle);
test_res = get_test_results("pc_test");
ASSERT_EQ(test_res, 1);
for (i = 0; i < CH_NUM; i++)
free(chan_samples[i]);
free(chan_samples);
}
/*
* Here we are testing the custom ioctl definition inside the virtual driver. If it triggers
* successfully, the driver sets the content of 'ioctl_test' debugfs file to '1'.
*/
TEST_F(pcmtest, reset_ioctl) {
snd_pcm_t *handle;
int test_res;
struct pcmtest_test_params *params = &self->params;
snd_pcm_sw_params_alloca(&self->swparams);
snd_pcm_hw_params_alloca(&self->hwparams);
ASSERT_EQ(setup_handle(&handle, self->swparams, self->hwparams, params,
self->card, SND_PCM_STREAM_CAPTURE), 0);
snd_pcm_reset(handle);
test_res = get_test_results("ioctl_test");
ASSERT_EQ(test_res, 1);
snd_pcm_close(handle);
}
TEST_HARNESS_MAIN