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Subject[PATCH v6 9/9] ALSA: virtio: introduce device suspend/resume support
Date
All running PCM substreams are stopped on device suspend and restarted
on device resume.

Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com>
---
sound/virtio/virtio_card.c | 56 +++++++++++++++++++++++++++++++++++
sound/virtio/virtio_pcm.c | 1 +
sound/virtio/virtio_pcm_ops.c | 41 ++++++++++++++++++++-----
3 files changed, 90 insertions(+), 8 deletions(-)

diff --git a/sound/virtio/virtio_card.c b/sound/virtio/virtio_card.c
index 59455a562018..c7ae8801991d 100644
--- a/sound/virtio/virtio_card.c
+++ b/sound/virtio/virtio_card.c
@@ -323,6 +323,58 @@ static void virtsnd_remove(struct virtio_device *vdev)
kfree(snd->event_msgs);
}

+#ifdef CONFIG_PM_SLEEP
+/**
+ * virtsnd_freeze() - Suspend device.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_freeze(struct virtio_device *vdev)
+{
+ struct virtio_snd *snd = vdev->priv;
+
+ virtsnd_ctl_msg_cancel_all(snd);
+
+ vdev->config->del_vqs(vdev);
+ vdev->config->reset(vdev);
+
+ kfree(snd->event_msgs);
+
+ /*
+ * If the virtsnd_restore() fails before re-allocating events, then we
+ * get a dangling pointer here.
+ */
+ snd->event_msgs = NULL;
+
+ return 0;
+}
+
+/**
+ * virtsnd_restore() - Resume device.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_restore(struct virtio_device *vdev)
+{
+ struct virtio_snd *snd = vdev->priv;
+ int rc;
+
+ rc = virtsnd_find_vqs(snd);
+ if (rc)
+ return rc;
+
+ virtio_device_ready(vdev);
+
+ virtsnd_enable_event_vq(snd);
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
static const struct virtio_device_id id_table[] = {
{ VIRTIO_ID_SOUND, VIRTIO_DEV_ANY_ID },
{ 0 },
@@ -335,6 +387,10 @@ static struct virtio_driver virtsnd_driver = {
.validate = virtsnd_validate,
.probe = virtsnd_probe,
.remove = virtsnd_remove,
+#ifdef CONFIG_PM_SLEEP
+ .freeze = virtsnd_freeze,
+ .restore = virtsnd_restore,
+#endif
};

static int __init init(void)
diff --git a/sound/virtio/virtio_pcm.c b/sound/virtio/virtio_pcm.c
index 3605151860f2..4a4a6583b002 100644
--- a/sound/virtio/virtio_pcm.c
+++ b/sound/virtio/virtio_pcm.c
@@ -109,6 +109,7 @@ static int virtsnd_pcm_build_hw(struct virtio_pcm_substream *vss,
SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_PAUSE;

if (!info->channels_min || info->channels_min > info->channels_max) {
diff --git a/sound/virtio/virtio_pcm_ops.c b/sound/virtio/virtio_pcm_ops.c
index d02d79bd94f3..03a7e2666cfb 100644
--- a/sound/virtio/virtio_pcm_ops.c
+++ b/sound/virtio/virtio_pcm_ops.c
@@ -167,7 +167,8 @@ static int virtsnd_pcm_hw_params(struct snd_pcm_substream *substream,
int vrate = -1;
int rc;

- if (virtsnd_pcm_msg_pending_num(vss)) {
+ if (runtime->status->state != SNDRV_PCM_STATE_SUSPENDED &&
+ virtsnd_pcm_msg_pending_num(vss)) {
dev_err(&vdev->dev, "SID %u: invalid I/O queue state\n",
vss->sid);
return -EBADFD;
@@ -231,6 +232,10 @@ static int virtsnd_pcm_hw_params(struct snd_pcm_substream *substream,
if (rc)
return rc;

+ /* If messages have already been allocated before, do nothing. */
+ if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
+ return 0;
+
/* Free previously allocated messages (if any). */
virtsnd_pcm_msg_free(vss);

@@ -267,20 +272,24 @@ static int virtsnd_pcm_hw_free(struct snd_pcm_substream *substream)
*/
static int virtsnd_pcm_prepare(struct snd_pcm_substream *substream)
{
+ struct snd_pcm_runtime *runtime = substream->runtime;
struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
struct virtio_device *vdev = vss->snd->vdev;
struct virtio_snd_msg *msg;

- if (virtsnd_pcm_msg_pending_num(vss)) {
- dev_err(&vdev->dev, "SID %u: invalid I/O queue state\n",
- vss->sid);
- return -EBADFD;
+ if (runtime->status->state != SNDRV_PCM_STATE_SUSPENDED) {
+ if (virtsnd_pcm_msg_pending_num(vss)) {
+ dev_err(&vdev->dev, "SID %u: invalid I/O queue state\n",
+ vss->sid);
+ return -EBADFD;
+ }
+
+ vss->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+ vss->hw_ptr = 0;
+ vss->msg_last_enqueued = -1;
}

- vss->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
- vss->hw_ptr = 0;
vss->xfer_xrun = false;
- vss->msg_last_enqueued = -1;
vss->msg_count = 0;

msg = virtsnd_pcm_ctl_msg_alloc(vss, VIRTIO_SND_R_PCM_PREPARE,
@@ -309,6 +318,21 @@ static int virtsnd_pcm_trigger(struct snd_pcm_substream *substream, int command)
int rc;

switch (command) {
+ case SNDRV_PCM_TRIGGER_RESUME: {
+ /*
+ * We restart the substream by executing the standard command
+ * sequence.
+ */
+ rc = virtsnd_pcm_hw_params(substream, NULL);
+ if (rc)
+ return rc;
+
+ rc = virtsnd_pcm_prepare(substream);
+ if (rc)
+ return rc;
+
+ fallthrough;
+ }
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: {
struct virtio_snd_queue *queue = virtsnd_pcm_queue(vss);
@@ -335,6 +359,7 @@ static int virtsnd_pcm_trigger(struct snd_pcm_substream *substream, int command)

return virtsnd_ctl_msg_send_sync(snd, msg);
}
+ case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH: {
spin_lock_irqsave(&vss->lock, flags);
--
2.30.1

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