aboutsummaryrefslogtreecommitdiffstats
path: root/sound/core/pcm_lib.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--sound/core/pcm_lib.c118
1 files changed, 90 insertions, 28 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 872a852de75c..8b6aeb8a78f7 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -106,6 +106,7 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
frames -= transfer;
ofs = 0;
}
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
}
#ifdef CONFIG_SND_DEBUG
@@ -185,7 +186,7 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream,
avail = snd_pcm_avail(substream);
if (avail > runtime->avail_max)
runtime->avail_max = avail;
- if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
if (avail >= runtime->buffer_size) {
snd_pcm_drain_done(substream);
return -EPIPE;
@@ -433,6 +434,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
no_delta_check:
if (runtime->status->hw_ptr == new_hw_ptr) {
+ runtime->hw_ptr_jiffies = curr_jiffies;
update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
return 0;
}
@@ -489,7 +491,7 @@ void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
EXPORT_SYMBOL(snd_pcm_set_ops);
/**
- * snd_pcm_sync - set the PCM sync id
+ * snd_pcm_set_sync - set the PCM sync id
* @substream: the pcm substream
*
* Sets the PCM sync identifier for the card.
@@ -1128,8 +1130,8 @@ int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
if (constrs->rules_num >= constrs->rules_all) {
struct snd_pcm_hw_rule *new;
unsigned int new_rules = constrs->rules_all + 16;
- new = krealloc(constrs->rules, new_rules * sizeof(*c),
- GFP_KERNEL);
+ new = krealloc_array(constrs->rules, new_rules,
+ sizeof(*c), GFP_KERNEL);
if (!new) {
va_end(args);
return -ENOMEM;
@@ -1745,7 +1747,7 @@ static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
channels = params_channels(params);
frame_size = snd_pcm_format_size(format, channels);
if (frame_size > 0)
- params->fifo_size /= (unsigned)frame_size;
+ params->fifo_size /= frame_size;
}
return 0;
}
@@ -1777,27 +1779,38 @@ int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
EXPORT_SYMBOL(snd_pcm_lib_ioctl);
/**
- * snd_pcm_period_elapsed - update the pcm status for the next period
- * @substream: the pcm substream instance
+ * snd_pcm_period_elapsed_under_stream_lock() - update the status of runtime for the next period
+ * under acquired lock of PCM substream.
+ * @substream: the instance of pcm substream.
+ *
+ * This function is called when the batch of audio data frames as the same size as the period of
+ * buffer is already processed in audio data transmission.
+ *
+ * The call of function updates the status of runtime with the latest position of audio data
+ * transmission, checks overrun and underrun over buffer, awaken user processes from waiting for
+ * available audio data frames, sampling audio timestamp, and performs stop or drain the PCM
+ * substream according to configured threshold.
+ *
+ * The function is intended to use for the case that PCM driver operates audio data frames under
+ * acquired lock of PCM substream; e.g. in callback of any operation of &snd_pcm_ops in process
+ * context. In any interrupt context, it's preferrable to use ``snd_pcm_period_elapsed()`` instead
+ * since lock of PCM substream should be acquired in advance.
+ *
+ * Developer should pay enough attention that some callbacks in &snd_pcm_ops are done by the call of
+ * function:
*
- * This function is called from the interrupt handler when the
- * PCM has processed the period size. It will update the current
- * pointer, wake up sleepers, etc.
+ * - .pointer - to retrieve current position of audio data transmission by frame count or XRUN state.
+ * - .trigger - with SNDRV_PCM_TRIGGER_STOP at XRUN or DRAINING state.
+ * - .get_time_info - to retrieve audio time stamp if needed.
*
- * Even if more than one periods have elapsed since the last call, you
- * have to call this only once.
+ * Even if more than one periods have elapsed since the last call, you have to call this only once.
*/
-void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
+void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
- unsigned long flags;
-
- if (snd_BUG_ON(!substream))
- return;
- snd_pcm_stream_lock_irqsave(substream, flags);
if (PCM_RUNTIME_CHECK(substream))
- goto _unlock;
+ return;
runtime = substream->runtime;
if (!snd_pcm_running(substream) ||
@@ -1809,8 +1822,31 @@ void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
snd_timer_interrupt(substream->timer, 1);
#endif
_end:
- kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
- _unlock:
+ snd_kill_fasync(runtime->fasync, SIGIO, POLL_IN);
+}
+EXPORT_SYMBOL(snd_pcm_period_elapsed_under_stream_lock);
+
+/**
+ * snd_pcm_period_elapsed() - update the status of runtime for the next period by acquiring lock of
+ * PCM substream.
+ * @substream: the instance of PCM substream.
+ *
+ * This function is mostly similar to ``snd_pcm_period_elapsed_under_stream_lock()`` except for
+ * acquiring lock of PCM substream voluntarily.
+ *
+ * It's typically called by any type of IRQ handler when hardware IRQ occurs to notify event that
+ * the batch of audio data frames as the same size as the period of buffer is already processed in
+ * audio data transmission.
+ */
+void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
+{
+ unsigned long flags;
+
+ if (snd_BUG_ON(!substream))
+ return;
+
+ snd_pcm_stream_lock_irqsave(substream, flags);
+ snd_pcm_period_elapsed_under_stream_lock(substream);
snd_pcm_stream_unlock_irqrestore(substream, flags);
}
EXPORT_SYMBOL(snd_pcm_period_elapsed);
@@ -1875,7 +1911,7 @@ static int wait_for_avail(struct snd_pcm_substream *substream,
snd_pcm_stream_lock_irq(substream);
set_current_state(TASK_INTERRUPTIBLE);
- switch (runtime->status->state) {
+ switch (runtime->state) {
case SNDRV_PCM_STATE_SUSPENDED:
err = -ESTRPIPE;
goto _endloop;
@@ -2063,14 +2099,14 @@ static int pcm_sanity_check(struct snd_pcm_substream *substream)
runtime = substream->runtime;
if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
return -EINVAL;
- if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ if (runtime->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
return 0;
}
static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
{
- switch (runtime->status->state) {
+ switch (runtime->state) {
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PAUSED:
@@ -2092,11 +2128,28 @@ int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
+ snd_pcm_sframes_t diff;
int ret;
if (old_appl_ptr == appl_ptr)
return 0;
+ if (appl_ptr >= runtime->boundary)
+ return -EINVAL;
+ /*
+ * check if a rewind is requested by the application
+ */
+ if (substream->runtime->info & SNDRV_PCM_INFO_NO_REWINDS) {
+ diff = appl_ptr - old_appl_ptr;
+ if (diff >= 0) {
+ if (diff > runtime->buffer_size)
+ return -EINVAL;
+ } else {
+ if (runtime->boundary + diff > runtime->buffer_size)
+ return -EINVAL;
+ }
+ }
+
runtime->control->appl_ptr = appl_ptr;
if (substream->ops->ack) {
ret = substream->ops->ack(substream);
@@ -2172,7 +2225,7 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
goto _end_unlock;
runtime->twake = runtime->control->avail_min ? : 1;
- if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ if (runtime->state == SNDRV_PCM_STATE_RUNNING)
snd_pcm_update_hw_ptr(substream);
/*
@@ -2180,7 +2233,7 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
* thread may start capture
*/
if (!is_playback &&
- runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
+ runtime->state == SNDRV_PCM_STATE_PREPARED &&
size >= runtime->start_threshold) {
err = snd_pcm_start(substream);
if (err < 0)
@@ -2194,7 +2247,7 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
snd_pcm_uframes_t cont;
if (!avail) {
if (!is_playback &&
- runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ runtime->state == SNDRV_PCM_STATE_DRAINING) {
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
goto _end_unlock;
}
@@ -2220,10 +2273,19 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
err = -EINVAL;
goto _end_unlock;
}
+ if (!atomic_inc_unless_negative(&runtime->buffer_accessing)) {
+ err = -EBUSY;
+ goto _end_unlock;
+ }
snd_pcm_stream_unlock_irq(substream);
+ if (!is_playback)
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
err = writer(substream, appl_ofs, data, offset, frames,
transfer);
+ if (is_playback)
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
snd_pcm_stream_lock_irq(substream);
+ atomic_dec(&runtime->buffer_accessing);
if (err < 0)
goto _end_unlock;
err = pcm_accessible_state(runtime);
@@ -2241,7 +2303,7 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
xfer += frames;
avail -= frames;
if (is_playback &&
- runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
+ runtime->state == SNDRV_PCM_STATE_PREPARED &&
snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
err = snd_pcm_start(substream);
if (err < 0)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.