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authorCharles Keepax <ckeepax@opensource.wolfsonmicro.com>2016-06-13 16:17:10 +0300
committerMark Brown <broonie@kernel.org>2016-06-13 18:45:37 +0300
commita4f2d87c63571d4cd9467d369f2fbf2362646043 (patch)
tree9ba1c814757a52c9f18c2be6bf0fd85f3c0d0e2a /sound/core/compress_offload.c
parent1a695a905c18548062509178b98bc91e67510864 (diff)
downloadlinux-a4f2d87c63571d4cd9467d369f2fbf2362646043.tar.xz
ALSA: compress: Add function to indicate the stream has gone bad
Currently, the avail IOCTL doesn't pass any error status, which means typically on error it simply shows no data available. This can lead to situations where user-space is waiting indefinitely for data that will never come as the DSP has suffered an unrecoverable error. Add snd_compr_stop_error which end drivers can call to indicate the stream has suffered an unrecoverable error and stop it. The avail and poll IOCTLs are then updated to report if the stream is in an error state to user-space. Allowing the error to propagate out. Processing of the actual snd_compr_stop needs to be deferred to a worker thread as the end driver may detect the errors during an existing operation callback. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/core/compress_offload.c')
-rw-r--r--sound/core/compress_offload.c67
1 files changed, 65 insertions, 2 deletions
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 9b3334be9df2..2c498488af6c 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -67,6 +67,8 @@ struct snd_compr_file {
struct snd_compr_stream stream;
};
+static void error_delayed_work(struct work_struct *work);
+
/*
* a note on stream states used:
* we use following states in the compressed core
@@ -123,6 +125,9 @@ static int snd_compr_open(struct inode *inode, struct file *f)
snd_card_unref(compr->card);
return -ENOMEM;
}
+
+ INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
+
data->stream.ops = compr->ops;
data->stream.direction = dirn;
data->stream.private_data = compr->private_data;
@@ -153,6 +158,8 @@ static int snd_compr_free(struct inode *inode, struct file *f)
struct snd_compr_file *data = f->private_data;
struct snd_compr_runtime *runtime = data->stream.runtime;
+ cancel_delayed_work_sync(&data->stream.error_work);
+
switch (runtime->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_DRAINING:
@@ -237,6 +244,15 @@ snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
avail = snd_compr_calc_avail(stream, &ioctl_avail);
ioctl_avail.avail = avail;
+ switch (stream->runtime->state) {
+ case SNDRV_PCM_STATE_OPEN:
+ return -EBADFD;
+ case SNDRV_PCM_STATE_XRUN:
+ return -EPIPE;
+ default:
+ break;
+ }
+
if (copy_to_user((__u64 __user *)arg,
&ioctl_avail, sizeof(ioctl_avail)))
return -EFAULT;
@@ -346,11 +362,13 @@ static ssize_t snd_compr_read(struct file *f, char __user *buf,
switch (stream->runtime->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_PREPARED:
- case SNDRV_PCM_STATE_XRUN:
case SNDRV_PCM_STATE_SUSPENDED:
case SNDRV_PCM_STATE_DISCONNECTED:
retval = -EBADFD;
goto out;
+ case SNDRV_PCM_STATE_XRUN:
+ retval = -EPIPE;
+ goto out;
}
avail = snd_compr_get_avail(stream);
@@ -399,10 +417,16 @@ static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
stream = &data->stream;
mutex_lock(&stream->device->lock);
- if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
+
+ switch (stream->runtime->state) {
+ case SNDRV_PCM_STATE_OPEN:
+ case SNDRV_PCM_STATE_XRUN:
retval = snd_compr_get_poll(stream) | POLLERR;
goto out;
+ default:
+ break;
}
+
poll_wait(f, &stream->runtime->sleep, wait);
avail = snd_compr_get_avail(stream);
@@ -697,6 +721,45 @@ static int snd_compr_stop(struct snd_compr_stream *stream)
return retval;
}
+static void error_delayed_work(struct work_struct *work)
+{
+ struct snd_compr_stream *stream;
+
+ stream = container_of(work, struct snd_compr_stream, error_work.work);
+
+ mutex_lock(&stream->device->lock);
+
+ stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
+ wake_up(&stream->runtime->sleep);
+
+ mutex_unlock(&stream->device->lock);
+}
+
+/*
+ * snd_compr_stop_error: Report a fatal error on a stream
+ * @stream: pointer to stream
+ * @state: state to transition the stream to
+ *
+ * Stop the stream and set its state.
+ *
+ * Should be called with compressed device lock held.
+ */
+int snd_compr_stop_error(struct snd_compr_stream *stream,
+ snd_pcm_state_t state)
+{
+ if (stream->runtime->state == state)
+ return 0;
+
+ stream->runtime->state = state;
+
+ pr_debug("Changing state to: %d\n", state);
+
+ queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_compr_stop_error);
+
static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
{
int ret;