The pcm_mutex is used to prevent concurrent execution of snd_pcm_ops callbacks. This works fine most of the cases but it can not handle setups when the same DAI is used by different rtd, for example: pcm3168a have two DAIs: one for Playback and one for Capture. If the codec is connected to a single CPU DAI we need to have two dai_link to support both playback and capture.
In this case the snd_pcm_ops callbacks can be executed in parallel causing unexpected races in DAI drivers.
By moving the pcm_mutex up to card level this can be solved while - hopefully - not breaking other setups.
Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com --- Hi,
I have tested the patch on several boards. it fixes the issue with single card with multiple dai_links where the CPU side (mcasp) is the same.
However I can not test with anything which use DPCM. It would be great if the patch would gather few tested-by from folks having access to more complicated setups.
The backround of this patch: https://mailman.alsa-project.org/pipermail/alsa-devel/2019-August/153864.htm...
Regards, Peter
include/sound/soc.h | 6 +++-- sound/soc/soc-compress.c | 48 ++++++++++++++++++++-------------------- sound/soc/soc-core.c | 2 +- sound/soc/soc-pcm.c | 36 +++++++++++++++--------------- 4 files changed, 47 insertions(+), 45 deletions(-)
diff --git a/include/sound/soc.h b/include/sound/soc.h index 6ac6481b4882..ec2dbe0ac2aa 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -990,6 +990,10 @@ struct snd_soc_card { struct mutex mutex; struct mutex dapm_mutex;
+ /* Mutex for PCM operations */ + struct mutex pcm_mutex; + enum snd_soc_pcm_subclass pcm_subclass; + spinlock_t dpcm_lock;
bool instantiated; @@ -1107,8 +1111,6 @@ struct snd_soc_pcm_runtime { struct device *dev; struct snd_soc_card *card; struct snd_soc_dai_link *dai_link; - struct mutex pcm_mutex; - enum snd_soc_pcm_subclass pcm_subclass; struct snd_pcm_ops ops;
unsigned int params_select; /* currently selected param for dai link */ diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c index 289211069a1e..9e54d8ae6d2c 100644 --- a/sound/soc/soc-compress.c +++ b/sound/soc/soc-compress.c @@ -80,7 +80,7 @@ static int soc_compr_open(struct snd_compr_stream *cstream) struct snd_soc_dai *cpu_dai = rtd->cpu_dai; int ret;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (cpu_dai->driver->cops && cpu_dai->driver->cops->startup) { ret = cpu_dai->driver->cops->startup(cstream, cpu_dai); @@ -108,7 +108,7 @@ static int soc_compr_open(struct snd_compr_stream *cstream)
snd_soc_runtime_activate(rtd, cstream->direction);
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex);
return 0;
@@ -118,7 +118,7 @@ static int soc_compr_open(struct snd_compr_stream *cstream) if (cpu_dai->driver->cops && cpu_dai->driver->cops->shutdown) cpu_dai->driver->cops->shutdown(cstream, cpu_dai); out: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -224,7 +224,7 @@ static void close_delayed_work(struct work_struct *work) container_of(work, struct snd_soc_pcm_runtime, delayed_work.work); struct snd_soc_dai *codec_dai = rtd->codec_dai;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
dev_dbg(rtd->dev, "Compress ASoC: pop wq checking: %s status: %s waiting: %s\n", @@ -239,7 +239,7 @@ static void close_delayed_work(struct work_struct *work) SND_SOC_DAPM_STREAM_STOP); }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); }
static int soc_compr_free(struct snd_compr_stream *cstream) @@ -249,7 +249,7 @@ static int soc_compr_free(struct snd_compr_stream *cstream) struct snd_soc_dai *codec_dai = rtd->codec_dai; int stream;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (cstream->direction == SND_COMPRESS_PLAYBACK) stream = SNDRV_PCM_STREAM_PLAYBACK; @@ -292,7 +292,7 @@ static int soc_compr_free(struct snd_compr_stream *cstream) SND_SOC_DAPM_STREAM_STOP); }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return 0; }
@@ -375,7 +375,7 @@ static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd) struct snd_soc_dai *cpu_dai = rtd->cpu_dai; int ret;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
ret = soc_compr_components_trigger(cstream, cmd); if (ret < 0) @@ -394,7 +394,7 @@ static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd) }
out: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -480,7 +480,7 @@ static int soc_compr_set_params(struct snd_compr_stream *cstream, struct snd_soc_dai *cpu_dai = rtd->cpu_dai; int ret;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
/* * First we call set_params for the CPU DAI, then the component @@ -514,14 +514,14 @@ static int soc_compr_set_params(struct snd_compr_stream *cstream,
/* cancel any delayed stream shutdown that is pending */ rtd->pop_wait = 0; - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex);
cancel_delayed_work_sync(&rtd->delayed_work);
return 0;
err: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -593,7 +593,7 @@ static int soc_compr_get_params(struct snd_compr_stream *cstream, struct snd_soc_dai *cpu_dai = rtd->cpu_dai; int ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (cpu_dai->driver->cops && cpu_dai->driver->cops->get_params) { ret = cpu_dai->driver->cops->get_params(cstream, params, cpu_dai); @@ -613,7 +613,7 @@ static int soc_compr_get_params(struct snd_compr_stream *cstream, }
err: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -625,7 +625,7 @@ static int soc_compr_get_caps(struct snd_compr_stream *cstream, struct snd_soc_rtdcom_list *rtdcom; int ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
for_each_rtdcom(rtd, rtdcom) { component = rtdcom->component; @@ -638,7 +638,7 @@ static int soc_compr_get_caps(struct snd_compr_stream *cstream, break; }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -650,7 +650,7 @@ static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream, struct snd_soc_rtdcom_list *rtdcom; int ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
for_each_rtdcom(rtd, rtdcom) { component = rtdcom->component; @@ -664,7 +664,7 @@ static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream, break; }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -676,7 +676,7 @@ static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes) struct snd_soc_dai *cpu_dai = rtd->cpu_dai; int ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (cpu_dai->driver->cops && cpu_dai->driver->cops->ack) { ret = cpu_dai->driver->cops->ack(cstream, bytes, cpu_dai); @@ -697,7 +697,7 @@ static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes) }
err: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -710,7 +710,7 @@ static int soc_compr_pointer(struct snd_compr_stream *cstream, int ret = 0; struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (cpu_dai->driver->cops && cpu_dai->driver->cops->pointer) cpu_dai->driver->cops->pointer(cstream, tstamp, cpu_dai); @@ -726,7 +726,7 @@ static int soc_compr_pointer(struct snd_compr_stream *cstream, break; }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -738,7 +738,7 @@ static int soc_compr_copy(struct snd_compr_stream *cstream, struct snd_soc_rtdcom_list *rtdcom; int ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
for_each_rtdcom(rtd, rtdcom) { component = rtdcom->component; @@ -751,7 +751,7 @@ static int soc_compr_copy(struct snd_compr_stream *cstream, break; }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index bb1e9e2c4ff4..7f2064889a23 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -1344,7 +1344,6 @@ static int soc_post_component_init(struct snd_soc_pcm_runtime *rtd, rtd->dev->groups = soc_dev_attr_groups; dev_set_name(rtd->dev, "%s", name); dev_set_drvdata(rtd->dev, rtd); - mutex_init(&rtd->pcm_mutex); INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients); INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].be_clients); INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].fe_clients); @@ -2395,6 +2394,7 @@ int snd_soc_register_card(struct snd_soc_card *card) card->instantiated = 0; mutex_init(&card->mutex); mutex_init(&card->dapm_mutex); + mutex_init(&card->pcm_mutex); spin_lock_init(&card->dpcm_lock);
return snd_soc_bind_card(card); diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index 77c986fe08d0..93bb4a347779 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -36,7 +36,7 @@ * Increments the active count for all the DAIs and components attached to a PCM * runtime. Should typically be called when a stream is opened. * - * Must be called with the rtd->pcm_mutex being held + * Must be called with the rtd->card->pcm_mutex being held */ void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream) { @@ -44,7 +44,7 @@ void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream) struct snd_soc_dai *codec_dai; int i;
- lockdep_assert_held(&rtd->pcm_mutex); + lockdep_assert_held(&rtd->card->pcm_mutex);
if (stream == SNDRV_PCM_STREAM_PLAYBACK) { cpu_dai->playback_active++; @@ -72,7 +72,7 @@ void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream) * Decrements the active count for all the DAIs and components attached to a PCM * runtime. Should typically be called when a stream is closed. * - * Must be called with the rtd->pcm_mutex being held + * Must be called with the rtd->card->pcm_mutex being held */ void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream) { @@ -80,7 +80,7 @@ void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream) struct snd_soc_dai *codec_dai; int i;
- lockdep_assert_held(&rtd->pcm_mutex); + lockdep_assert_held(&rtd->card->pcm_mutex);
if (stream == SNDRV_PCM_STREAM_PLAYBACK) { cpu_dai->playback_active--; @@ -506,7 +506,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream) pm_runtime_get_sync(component->dev); }
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
/* startup the audio subsystem */ ret = snd_soc_dai_startup(cpu_dai, substream); @@ -604,7 +604,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
snd_soc_runtime_activate(rtd, substream->stream);
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return 0;
config_err: @@ -623,7 +623,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
snd_soc_dai_shutdown(cpu_dai, substream); out: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex);
for_each_rtdcom(rtd, rtdcom) { component = rtdcom->component; @@ -653,7 +653,7 @@ static void close_delayed_work(struct work_struct *work) container_of(work, struct snd_soc_pcm_runtime, delayed_work.work); struct snd_soc_dai *codec_dai = rtd->codec_dais[0];
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n", codec_dai->driver->playback.stream_name, @@ -667,7 +667,7 @@ static void close_delayed_work(struct work_struct *work) SND_SOC_DAPM_STREAM_STOP); }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); }
static void codec2codec_close_delayed_work(struct work_struct *work) @@ -694,7 +694,7 @@ static int soc_pcm_close(struct snd_pcm_substream *substream) struct snd_soc_dai *codec_dai; int i;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
snd_soc_runtime_deactivate(rtd, substream->stream);
@@ -738,7 +738,7 @@ static int soc_pcm_close(struct snd_pcm_substream *substream) SND_SOC_DAPM_STREAM_STOP); }
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex);
for_each_rtdcom(rtd, rtdcom) { component = rtdcom->component; @@ -771,7 +771,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream) struct snd_soc_dai *codec_dai; int i, ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
if (rtd->dai_link->ops->prepare) { ret = rtd->dai_link->ops->prepare(substream); @@ -826,7 +826,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream) snd_soc_dai_digital_mute(cpu_dai, 0, substream->stream);
out: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -876,7 +876,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_soc_dai *codec_dai; int i, ret = 0;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass); if (rtd->dai_link->ops->hw_params) { ret = rtd->dai_link->ops->hw_params(substream, params); if (ret < 0) { @@ -962,7 +962,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream, if (ret) goto component_err; out: - mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret;
component_err: @@ -986,7 +986,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream, if (rtd->dai_link->ops->hw_free) rtd->dai_link->ops->hw_free(substream);
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return ret; }
@@ -1001,7 +1001,7 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream) bool playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; int i;
- mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); + mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
/* clear the corresponding DAIs parameters when going to be inactive */ if (cpu_dai->active == 1) { @@ -1043,7 +1043,7 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
snd_soc_dai_hw_free(cpu_dai, substream);
- mutex_unlock(&rtd->pcm_mutex); + mutex_unlock(&rtd->card->pcm_mutex); return 0; }