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authorTakashi Iwai <tiwai@suse.de>2014-08-29 15:32:29 +0200
committerTakashi Iwai <tiwai@suse.de>2014-09-03 14:04:08 +0200
commit257f8cce5d40b811d229ed71602882baa0012808 (patch)
tree190a239257c625539a1b157acb3bd0075cdb61dc /sound/core
parent52addcf9d6669fa439387610bc65c92fa0980cef (diff)
ALSA: pcm: Allow nonatomic trigger operations
Currently, many PCM operations are performed in a critical section protected by spinlock, typically the trigger and pointer callbacks are assumed to be atomic. This is basically because some trigger action (e.g. PCM stop after drain or xrun) is done in the interrupt handler. If a driver runs in a threaded irq, however, this doesn't have to be atomic. And many devices want to handle trigger in a non-atomic context due to lengthy communications. This patch tries all PCM calls operational in non-atomic context. What it does is very simple: replaces the substream spinlock with the corresponding substream mutex when pcm->nonatomic flag is set. The driver that wants to use the non-atomic PCM ops just needs to set the flag and keep the rest as is. (Of course, it must not handle any PCM ops in irq context.) Note that the code doesn't check whether it's atomic-safe or not, but trust in 100% that the driver sets pcm->nonatomic correctly. One possible problem is the case where linked PCM substreams have inconsistent nonatomic states. For avoiding this, snd_pcm_link() returns an error if one tries to link an inconsistent PCM substream. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm.c1
-rw-r--r--sound/core/pcm_native.c76
2 files changed, 70 insertions, 7 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 43932e8dce66..afccdc553ef9 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -698,6 +698,7 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
}
substream->group = &substream->self_group;
spin_lock_init(&substream->self_group.lock);
+ mutex_init(&substream->self_group.mutex);
INIT_LIST_HEAD(&substream->self_group.substreams);
list_add_tail(&substream->link_list, &substream->self_group.substreams);
atomic_set(&substream->mmap_count, 0);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 8cd2f930ad0b..16d9b7e15f8b 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -77,7 +77,8 @@ static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
DEFINE_RWLOCK(snd_pcm_link_rwlock);
EXPORT_SYMBOL(snd_pcm_link_rwlock);
-static DECLARE_RWSEM(snd_pcm_link_rwsem);
+DECLARE_RWSEM(snd_pcm_link_rwsem);
+EXPORT_SYMBOL(snd_pcm_link_rwsem);
static inline mm_segment_t snd_enter_user(void)
{
@@ -727,9 +728,14 @@ static int snd_pcm_action_group(struct action_ops *ops,
int res = 0;
snd_pcm_group_for_each_entry(s, substream) {
- if (do_lock && s != substream)
- spin_lock_nested(&s->self_group.lock,
- SINGLE_DEPTH_NESTING);
+ if (do_lock && s != substream) {
+ if (s->pcm->nonatomic)
+ mutex_lock_nested(&s->self_group.mutex,
+ SINGLE_DEPTH_NESTING);
+ else
+ spin_lock_nested(&s->self_group.lock,
+ SINGLE_DEPTH_NESTING);
+ }
res = ops->pre_action(s, state);
if (res < 0)
goto _unlock;
@@ -755,8 +761,12 @@ static int snd_pcm_action_group(struct action_ops *ops,
if (do_lock) {
/* unlock streams */
snd_pcm_group_for_each_entry(s1, substream) {
- if (s1 != substream)
- spin_unlock(&s1->self_group.lock);
+ if (s1 != substream) {
+ if (s->pcm->nonatomic)
+ mutex_unlock(&s1->self_group.mutex);
+ else
+ spin_unlock(&s1->self_group.lock);
+ }
if (s1 == s) /* end */
break;
}
@@ -784,6 +794,27 @@ static int snd_pcm_action_single(struct action_ops *ops,
return res;
}
+/* call in mutex-protected context */
+static int snd_pcm_action_mutex(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state)
+{
+ int res;
+
+ if (snd_pcm_stream_linked(substream)) {
+ if (!mutex_trylock(&substream->group->mutex)) {
+ mutex_unlock(&substream->self_group.mutex);
+ mutex_lock(&substream->group->mutex);
+ mutex_lock(&substream->self_group.mutex);
+ }
+ res = snd_pcm_action_group(ops, substream, state, 1);
+ mutex_unlock(&substream->group->mutex);
+ } else {
+ res = snd_pcm_action_single(ops, substream, state);
+ }
+ return res;
+}
+
/*
* Note: call with stream lock
*/
@@ -793,6 +824,9 @@ static int snd_pcm_action(struct action_ops *ops,
{
int res;
+ if (substream->pcm->nonatomic)
+ return snd_pcm_action_mutex(ops, substream, state);
+
if (snd_pcm_stream_linked(substream)) {
if (!spin_trylock(&substream->group->lock)) {
spin_unlock(&substream->self_group.lock);
@@ -807,6 +841,29 @@ static int snd_pcm_action(struct action_ops *ops,
return res;
}
+static int snd_pcm_action_lock_mutex(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state)
+{
+ int res;
+
+ down_read(&snd_pcm_link_rwsem);
+ if (snd_pcm_stream_linked(substream)) {
+ mutex_lock(&substream->group->mutex);
+ mutex_lock_nested(&substream->self_group.mutex,
+ SINGLE_DEPTH_NESTING);
+ res = snd_pcm_action_group(ops, substream, state, 1);
+ mutex_unlock(&substream->self_group.mutex);
+ mutex_unlock(&substream->group->mutex);
+ } else {
+ mutex_lock(&substream->self_group.mutex);
+ res = snd_pcm_action_single(ops, substream, state);
+ mutex_unlock(&substream->self_group.mutex);
+ }
+ up_read(&snd_pcm_link_rwsem);
+ return res;
+}
+
/*
* Note: don't use any locks before
*/
@@ -816,6 +873,9 @@ static int snd_pcm_action_lock_irq(struct action_ops *ops,
{
int res;
+ if (substream->pcm->nonatomic)
+ return snd_pcm_action_lock_mutex(ops, substream, state);
+
read_lock_irq(&snd_pcm_link_rwlock);
if (snd_pcm_stream_linked(substream)) {
spin_lock(&substream->group->lock);
@@ -1634,7 +1694,8 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
down_write(&snd_pcm_link_rwsem);
write_lock_irq(&snd_pcm_link_rwlock);
if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
- substream->runtime->status->state != substream1->runtime->status->state) {
+ substream->runtime->status->state != substream1->runtime->status->state ||
+ substream->pcm->nonatomic != substream1->pcm->nonatomic) {
res = -EBADFD;
goto _end;
}
@@ -1646,6 +1707,7 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
substream->group = group;
group = NULL;
spin_lock_init(&substream->group->lock);
+ mutex_init(&substream->group->mutex);
INIT_LIST_HEAD(&substream->group->substreams);
list_add_tail(&substream->link_list, &substream->group->substreams);
substream->group->count = 1;

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