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Message-ID: <20210221135731.51348-10-anton.yakovlev@opensynergy.com>
Date: Sun, 21 Feb 2021 14:57:31 +0100
From: Anton Yakovlev <anton.yakovlev@...nsynergy.com>
To: <virtualization@...ts.linux-foundation.org>,
<alsa-devel@...a-project.org>, <virtio-dev@...ts.oasis-open.org>
CC: "Michael S. Tsirkin" <mst@...hat.com>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 9/9] ALSA: virtio: introduce device suspend/resume support
All running PCM substreams are stopped on device suspend and restarted
on device resume.
Signed-off-by: Anton Yakovlev <anton.yakovlev@...nsynergy.com>
---
sound/virtio/virtio_card.c | 57 +++++++++++++++++++++++++++++++++++
sound/virtio/virtio_pcm.c | 1 +
sound/virtio/virtio_pcm_ops.c | 44 ++++++++++++++++++++-------
3 files changed, 91 insertions(+), 11 deletions(-)
diff --git a/sound/virtio/virtio_card.c b/sound/virtio/virtio_card.c
index 787a4dec1da8..1f0a0fa7bbc0 100644
--- a/sound/virtio/virtio_card.c
+++ b/sound/virtio/virtio_card.c
@@ -373,6 +373,59 @@ static void virtsnd_config_changed(struct virtio_device *vdev)
"sound device configuration was changed\n");
}
+#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;
+
+ /* Stop all the virtqueues. */
+ vdev->config->reset(vdev);
+ vdev->config->del_vqs(vdev);
+
+ virtsnd_ctl_msg_cancel_all(snd);
+
+ 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 },
@@ -386,6 +439,10 @@ static struct virtio_driver virtsnd_driver = {
.probe = virtsnd_probe,
.remove = virtsnd_remove,
.config_changed = virtsnd_config_changed,
+#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 5f7b4090c6a2..d7471e0a9d04 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 07510778b555..ccef64502c13 100644
--- a/sound/virtio/virtio_pcm_ops.c
+++ b/sound/virtio/virtio_pcm_ops.c
@@ -218,6 +218,10 @@ 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;
+
return virtsnd_pcm_msg_alloc(vss, periods, period_bytes);
}
@@ -258,19 +262,21 @@ static int virtsnd_pcm_prepare(struct snd_pcm_substream *substream)
}
spin_lock_irqsave(&vss->lock, flags);
- /*
- * Since I/O messages are asynchronous, they can be completed
- * when the runtime structure no longer exists. Since each
- * completion implies incrementing the hw_ptr, we cache all the
- * current values needed to compute the new hw_ptr value.
- */
- vss->frame_bytes = runtime->frame_bits >> 3;
- vss->period_size = runtime->period_size;
- vss->buffer_size = runtime->buffer_size;
+ if (runtime->status->state != SNDRV_PCM_STATE_SUSPENDED) {
+ /*
+ * Since I/O messages are asynchronous, they can be completed
+ * when the runtime structure no longer exists. Since each
+ * completion implies incrementing the hw_ptr, we cache all the
+ * current values needed to compute the new hw_ptr value.
+ */
+ vss->frame_bytes = runtime->frame_bits >> 3;
+ vss->period_size = runtime->period_size;
+ vss->buffer_size = runtime->buffer_size;
- vss->hw_ptr = 0;
+ vss->hw_ptr = 0;
+ vss->msg_last_enqueued = -1;
+ }
vss->xfer_xrun = false;
- vss->msg_last_enqueued = -1;
vss->msg_count = 0;
spin_unlock_irqrestore(&vss->lock, flags);
@@ -300,6 +306,21 @@ 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);
@@ -326,6 +347,7 @@ 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);
--
2.30.0
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