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authorTakashi Iwai <tiwai@suse.de>2014-09-08 11:01:10 +0200
committerTakashi Iwai <tiwai@suse.de>2014-09-08 11:01:44 +0200
commit7fd4394dfe1db02ba904dfa1048f718cbca822d1 (patch)
tree902d159ced8c873ee8f58c3301c30f674f099a03 /sound/core
parentd6cc58e127a0b7df78d869a29ff073da6fb899bb (diff)
parent7af142f752116e86adbe2073f2922d8265a77709 (diff)
Merge branch 'topic/pcm-nonatomic' into for-next
This is a merge for exending PCM ops to be non-atomic.
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm.c1
-rw-r--r--sound/core/pcm_native.c136
2 files changed, 128 insertions, 9 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..85fe1a216225 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -74,11 +74,68 @@ 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 DEFINE_RWLOCK(snd_pcm_link_rwlock);
static DECLARE_RWSEM(snd_pcm_link_rwsem);
+void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
+{
+ if (substream->pcm->nonatomic) {
+ down_read(&snd_pcm_link_rwsem);
+ mutex_lock(&substream->self_group.mutex);
+ } else {
+ read_lock(&snd_pcm_link_rwlock);
+ spin_lock(&substream->self_group.lock);
+ }
+}
+EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
+
+void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
+{
+ if (substream->pcm->nonatomic) {
+ mutex_unlock(&substream->self_group.mutex);
+ up_read(&snd_pcm_link_rwsem);
+ } else {
+ spin_unlock(&substream->self_group.lock);
+ read_unlock(&snd_pcm_link_rwlock);
+ }
+}
+EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
+
+void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
+{
+ if (!substream->pcm->nonatomic)
+ local_irq_disable();
+ snd_pcm_stream_lock(substream);
+}
+EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
+
+void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
+{
+ snd_pcm_stream_unlock(substream);
+ if (!substream->pcm->nonatomic)
+ local_irq_enable();
+}
+EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
+
+unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
+{
+ unsigned long flags = 0;
+ if (!substream->pcm->nonatomic)
+ local_irq_save(flags);
+ snd_pcm_stream_lock(substream);
+ return flags;
+}
+EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
+
+void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
+ unsigned long flags)
+{
+ snd_pcm_stream_unlock(substream);
+ if (!substream->pcm->nonatomic)
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
+
static inline mm_segment_t snd_enter_user(void)
{
mm_segment_t fs = get_fs();
@@ -727,9 +784,14 @@ 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 +817,12 @@ 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 +850,27 @@ 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 +880,9 @@ 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 +897,29 @@ 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 +929,9 @@ 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 +1750,8 @@ 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 +1763,7 @@ 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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