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author | Takashi Iwai <tiwai@suse.de> | 2014-09-08 13:01:10 +0400 |
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committer | Takashi Iwai <tiwai@suse.de> | 2014-09-08 13:01:44 +0400 |
commit | 7fd4394dfe1db02ba904dfa1048f718cbca822d1 (patch) | |
tree | 902d159ced8c873ee8f58c3301c30f674f099a03 /sound/core | |
parent | d6cc58e127a0b7df78d869a29ff073da6fb899bb (diff) | |
parent | 7af142f752116e86adbe2073f2922d8265a77709 (diff) | |
download | linux-7fd4394dfe1db02ba904dfa1048f718cbca822d1.tar.xz |
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.c | 1 | ||||
-rw-r--r-- | sound/core/pcm_native.c | 136 |
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; |