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linux/sound/soc/soc-compress.c
Takashi Iwai 2c4e315457 ALSA: compress: Initialize mutex in snd_compress_new() 
Currently the snd_compr.lock mutex isn't initialized in the API
functions although the lock is used many places in other code in
compress offload API.  It's because the object was expected to be
initialized via snd_compress_register(), but this was never used by
ASoC, which is the only user.  Instead, ASoC initializes the mutex by
itself, and this is error-prone.

This patch moves the mutex initialization into the more appropriate
place, snd_compress_new(), for avoiding the missing init.

Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20210714162424.4412-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-07-15 10:22:38 +02:00

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// SPDX-License-Identifier: GPL-2.0+
//
// soc-compress.c -- ALSA SoC Compress
//
// Copyright (C) 2012 Intel Corp.
//
// Authors: Namarta Kohli <namartax.kohli@intel.com>
// Ramesh Babu K V <ramesh.babu@linux.intel.com>
// Vinod Koul <vinod.koul@linux.intel.com>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <sound/core.h>
#include <sound/compress_params.h>
#include <sound/compress_driver.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/soc-dpcm.h>
#include <sound/soc-link.h>
#include <linux/pm_runtime.h>
static int soc_compr_clean(struct snd_compr_stream *cstream, int rollback)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (!rollback)
snd_soc_runtime_deactivate(rtd, stream);
snd_soc_dai_digital_mute(codec_dai, 1, stream);
if (!snd_soc_dai_active(cpu_dai))
cpu_dai->rate = 0;
if (!snd_soc_dai_active(codec_dai))
codec_dai->rate = 0;
snd_soc_link_compr_shutdown(cstream, rollback);
snd_soc_component_compr_free(cstream, rollback);
snd_soc_dai_compr_shutdown(cpu_dai, cstream, rollback);
if (!rollback)
snd_soc_dapm_stream_stop(rtd, stream);
mutex_unlock(&rtd->card->pcm_mutex);
snd_soc_pcm_component_pm_runtime_put(rtd, cstream, rollback);
return 0;
}
static int soc_compr_free(struct snd_compr_stream *cstream)
{
return soc_compr_clean(cstream, 0);
}
static int soc_compr_open(struct snd_compr_stream *cstream)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
int ret;
ret = snd_soc_pcm_component_pm_runtime_get(rtd, cstream);
if (ret < 0)
goto err_no_lock;
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
if (ret < 0)
goto err;
ret = snd_soc_component_compr_open(cstream);
if (ret < 0)
goto err;
ret = snd_soc_link_compr_startup(cstream);
if (ret < 0)
goto err;
snd_soc_runtime_activate(rtd, stream);
err:
mutex_unlock(&rtd->card->pcm_mutex);
err_no_lock:
if (ret < 0)
soc_compr_clean(cstream, 1);
return ret;
}
static int soc_compr_open_fe(struct snd_compr_stream *cstream)
{
struct snd_soc_pcm_runtime *fe = cstream->private_data;
struct snd_pcm_substream *fe_substream =
fe->pcm->streams[cstream->direction].substream;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
struct snd_soc_dpcm *dpcm;
struct snd_soc_dapm_widget_list *list;
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
int ret;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
fe->dpcm[stream].runtime = fe_substream->runtime;
ret = dpcm_path_get(fe, stream, &list);
if (ret < 0)
goto be_err;
/* calculate valid and active FE <-> BE dpcms */
dpcm_process_paths(fe, stream, &list, 1);
fe->dpcm[stream].runtime = fe_substream->runtime;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
ret = dpcm_be_dai_startup(fe, stream);
if (ret < 0) {
/* clean up all links */
for_each_dpcm_be(fe, stream, dpcm)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
dpcm_be_disconnect(fe, stream);
fe->dpcm[stream].runtime = NULL;
goto out;
}
ret = snd_soc_dai_compr_startup(cpu_dai, cstream);
if (ret < 0)
goto out;
ret = snd_soc_component_compr_open(cstream);
if (ret < 0)
goto open_err;
ret = snd_soc_link_compr_startup(cstream);
if (ret < 0)
goto machine_err;
dpcm_clear_pending_state(fe, stream);
dpcm_path_put(&list);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
snd_soc_runtime_activate(fe, stream);
mutex_unlock(&fe->card->pcm_mutex);
mutex_unlock(&fe->card->mutex);
return 0;
machine_err:
snd_soc_component_compr_free(cstream, 1);
open_err:
snd_soc_dai_compr_shutdown(cpu_dai, cstream, 1);
out:
dpcm_path_put(&list);
be_err:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_unlock(&fe->card->mutex);
return ret;
}
static int soc_compr_free_fe(struct snd_compr_stream *cstream)
{
struct snd_soc_pcm_runtime *fe = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
struct snd_soc_dpcm *dpcm;
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
snd_soc_runtime_deactivate(fe, stream);
mutex_unlock(&fe->card->pcm_mutex);
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
dpcm_be_dai_hw_free(fe, stream);
dpcm_be_dai_shutdown(fe, stream);
/* mark FE's links ready to prune */
for_each_dpcm_be(fe, stream, dpcm)
dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
dpcm_be_disconnect(fe, stream);
fe->dpcm[stream].runtime = NULL;
snd_soc_link_compr_shutdown(cstream, 0);
snd_soc_component_compr_free(cstream, 0);
snd_soc_dai_compr_shutdown(cpu_dai, cstream, 0);
mutex_unlock(&fe->card->mutex);
return 0;
}
static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
int ret;
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
ret = snd_soc_component_compr_trigger(cstream, cmd);
if (ret < 0)
goto out;
ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
if (ret < 0)
goto out;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
snd_soc_dai_digital_mute(codec_dai, 0, stream);
break;
case SNDRV_PCM_TRIGGER_STOP:
snd_soc_dai_digital_mute(codec_dai, 1, stream);
break;
}
out:
mutex_unlock(&rtd->card->pcm_mutex);
return ret;
}
static int soc_compr_trigger_fe(struct snd_compr_stream *cstream, int cmd)
{
struct snd_soc_pcm_runtime *fe = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
int ret;
if (cmd == SND_COMPR_TRIGGER_PARTIAL_DRAIN ||
cmd == SND_COMPR_TRIGGER_DRAIN)
return snd_soc_component_compr_trigger(cstream, cmd);
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd);
if (ret < 0)
goto out;
ret = snd_soc_component_compr_trigger(cstream, cmd);
if (ret < 0)
goto out;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
ret = dpcm_be_dai_trigger(fe, stream, cmd);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
break;
}
out:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_unlock(&fe->card->mutex);
return ret;
}
static int soc_compr_set_params(struct snd_compr_stream *cstream,
struct snd_compr_params *params)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
int ret;
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
/*
* First we call set_params for the CPU DAI, then the component
* driver this should configure the SoC side. If the machine has
* compressed ops then we call that as well. The expectation is
* that these callbacks will configure everything for this compress
* path, like configuring a PCM port for a CODEC.
*/
ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
if (ret < 0)
goto err;
ret = snd_soc_component_compr_set_params(cstream, params);
if (ret < 0)
goto err;
ret = snd_soc_link_compr_set_params(cstream);
if (ret < 0)
goto err;
snd_soc_dapm_stream_event(rtd, stream, SND_SOC_DAPM_STREAM_START);
/* cancel any delayed stream shutdown that is pending */
rtd->pop_wait = 0;
mutex_unlock(&rtd->card->pcm_mutex);
cancel_delayed_work_sync(&rtd->delayed_work);
return 0;
err:
mutex_unlock(&rtd->card->pcm_mutex);
return ret;
}
static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
struct snd_compr_params *params)
{
struct snd_soc_pcm_runtime *fe = cstream->private_data;
struct snd_pcm_substream *fe_substream =
fe->pcm->streams[cstream->direction].substream;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
int ret;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
/*
* Create an empty hw_params for the BE as the machine driver must
* fix this up to match DSP decoder and ASRC configuration.
* I.e. machine driver fixup for compressed BE is mandatory.
*/
memset(&fe->dpcm[fe_substream->stream].hw_params, 0,
sizeof(struct snd_pcm_hw_params));
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
ret = dpcm_be_dai_hw_params(fe, stream);
if (ret < 0)
goto out;
ret = dpcm_be_dai_prepare(fe, stream);
if (ret < 0)
goto out;
ret = snd_soc_dai_compr_set_params(cpu_dai, cstream, params);
if (ret < 0)
goto out;
ret = snd_soc_component_compr_set_params(cstream, params);
if (ret < 0)
goto out;
ret = snd_soc_link_compr_set_params(cstream);
if (ret < 0)
goto out;
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
out:
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_unlock(&fe->card->mutex);
return ret;
}
static int soc_compr_get_params(struct snd_compr_stream *cstream,
struct snd_codec *params)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int ret = 0;
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
ret = snd_soc_dai_compr_get_params(cpu_dai, cstream, params);
if (ret < 0)
goto err;
ret = snd_soc_component_compr_get_params(cstream, params);
err:
mutex_unlock(&rtd->card->pcm_mutex);
return ret;
}
static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int ret;
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
ret = snd_soc_dai_compr_ack(cpu_dai, cstream, bytes);
if (ret < 0)
goto err;
ret = snd_soc_component_compr_ack(cstream, bytes);
err:
mutex_unlock(&rtd->card->pcm_mutex);
return ret;
}
static int soc_compr_pointer(struct snd_compr_stream *cstream,
struct snd_compr_tstamp *tstamp)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
int ret;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
ret = snd_soc_dai_compr_pointer(cpu_dai, cstream, tstamp);
if (ret < 0)
goto out;
ret = snd_soc_component_compr_pointer(cstream, tstamp);
out:
mutex_unlock(&rtd->card->pcm_mutex);
return ret;
}
static int soc_compr_set_metadata(struct snd_compr_stream *cstream,
struct snd_compr_metadata *metadata)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int ret;
ret = snd_soc_dai_compr_set_metadata(cpu_dai, cstream, metadata);
if (ret < 0)
return ret;
return snd_soc_component_compr_set_metadata(cstream, metadata);
}
static int soc_compr_get_metadata(struct snd_compr_stream *cstream,
struct snd_compr_metadata *metadata)
{
struct snd_soc_pcm_runtime *rtd = cstream->private_data;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int ret;
ret = snd_soc_dai_compr_get_metadata(cpu_dai, cstream, metadata);
if (ret < 0)
return ret;
return snd_soc_component_compr_get_metadata(cstream, metadata);
}
/* ASoC Compress operations */
static struct snd_compr_ops soc_compr_ops = {
.open = soc_compr_open,
.free = soc_compr_free,
.set_params = soc_compr_set_params,
.set_metadata = soc_compr_set_metadata,
.get_metadata = soc_compr_get_metadata,
.get_params = soc_compr_get_params,
.trigger = soc_compr_trigger,
.pointer = soc_compr_pointer,
.ack = soc_compr_ack,
.get_caps = snd_soc_component_compr_get_caps,
.get_codec_caps = snd_soc_component_compr_get_codec_caps,
};
/* ASoC Dynamic Compress operations */
static struct snd_compr_ops soc_compr_dyn_ops = {
.open = soc_compr_open_fe,
.free = soc_compr_free_fe,
.set_params = soc_compr_set_params_fe,
.get_params = soc_compr_get_params,
.set_metadata = soc_compr_set_metadata,
.get_metadata = soc_compr_get_metadata,
.trigger = soc_compr_trigger_fe,
.pointer = soc_compr_pointer,
.ack = soc_compr_ack,
.get_caps = snd_soc_component_compr_get_caps,
.get_codec_caps = snd_soc_component_compr_get_codec_caps,
};
/**
* snd_soc_new_compress - create a new compress.
*
* @rtd: The runtime for which we will create compress
* @num: the device index number (zero based - shared with normal PCMs)
*
* Return: 0 for success, else error.
*/
int snd_soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num)
{
struct snd_soc_component *component;
struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
struct snd_compr *compr;
struct snd_pcm *be_pcm;
char new_name[64];
int ret = 0, direction = 0;
int playback = 0, capture = 0;
int i;
/*
* make sure these are same value,
* and then use these as equally
*/
BUILD_BUG_ON((int)SNDRV_PCM_STREAM_PLAYBACK != (int)SND_COMPRESS_PLAYBACK);
BUILD_BUG_ON((int)SNDRV_PCM_STREAM_CAPTURE != (int)SND_COMPRESS_CAPTURE);
if (rtd->num_cpus > 1 ||
rtd->num_codecs > 1) {
dev_err(rtd->card->dev,
"Compress ASoC: Multi CPU/Codec not supported\n");
return -EINVAL;
}
/* check client and interface hw capabilities */
if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_PLAYBACK))
playback = 1;
if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_CAPTURE))
capture = 1;
/*
* Compress devices are unidirectional so only one of the directions
* should be set, check for that (xor)
*/
if (playback + capture != 1) {
dev_err(rtd->card->dev,
"Compress ASoC: Invalid direction for P %d, C %d\n",
playback, capture);
return -EINVAL;
}
if (playback)
direction = SND_COMPRESS_PLAYBACK;
else
direction = SND_COMPRESS_CAPTURE;
compr = devm_kzalloc(rtd->card->dev, sizeof(*compr), GFP_KERNEL);
if (!compr)
return -ENOMEM;
compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops),
GFP_KERNEL);
if (!compr->ops)
return -ENOMEM;
if (rtd->dai_link->dynamic) {
snprintf(new_name, sizeof(new_name), "(%s)",
rtd->dai_link->stream_name);
ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
rtd->dai_link->dpcm_playback,
rtd->dai_link->dpcm_capture, &be_pcm);
if (ret < 0) {
dev_err(rtd->card->dev,
"Compress ASoC: can't create compressed for %s: %d\n",
rtd->dai_link->name, ret);
return ret;
}
rtd->pcm = be_pcm;
rtd->fe_compr = 1;
if (rtd->dai_link->dpcm_playback)
be_pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
else if (rtd->dai_link->dpcm_capture)
be_pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
memcpy(compr->ops, &soc_compr_dyn_ops, sizeof(soc_compr_dyn_ops));
} else {
snprintf(new_name, sizeof(new_name), "%s %s-%d",
rtd->dai_link->stream_name, codec_dai->name, num);
memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops));
}
for_each_rtd_components(rtd, i, component) {
if (!component->driver->compress_ops ||
!component->driver->compress_ops->copy)
continue;
compr->ops->copy = snd_soc_component_compr_copy;
break;
}
ret = snd_compress_new(rtd->card->snd_card, num, direction,
new_name, compr);
if (ret < 0) {
component = asoc_rtd_to_codec(rtd, 0)->component;
dev_err(component->dev,
"Compress ASoC: can't create compress for codec %s: %d\n",
component->name, ret);
return ret;
}
/* DAPM dai link stream work */
rtd->close_delayed_work_func = snd_soc_close_delayed_work;
rtd->compr = compr;
compr->private_data = rtd;
dev_dbg(rtd->card->dev, "Compress ASoC: %s <-> %s mapping ok\n",
codec_dai->name, cpu_dai->name);
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_new_compress);
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