ALSA: virtio: handling control messages
The control queue can be used by different parts of the driver to send
commands to the device. Control messages can be either synchronous or
asynchronous. The lifetime of a message is controlled by a reference
count.
Introduce a module parameter to set the message completion timeout:
msg_timeout_ms [=1000]
Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com>
Link: https://lore.kernel.org/r/20210302164709.3142702-4-anton.yakovlev@opensynergy.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/virtio/virtio_card.h b/sound/virtio/virtio_card.h
index b903b1b..1e76eef 100644
--- a/sound/virtio/virtio_card.h
+++ b/sound/virtio/virtio_card.h
@@ -11,6 +11,8 @@
#include <sound/core.h>
#include <uapi/linux/virtio_snd.h>
+#include "virtio_ctl_msg.h"
+
#define VIRTIO_SND_CARD_DRIVER "virtio-snd"
#define VIRTIO_SND_CARD_NAME "VirtIO SoundCard"
@@ -29,15 +31,20 @@ struct virtio_snd_queue {
* @vdev: Underlying virtio device.
* @queues: Virtqueue wrappers.
* @card: ALSA sound card.
+ * @ctl_msgs: Pending control request list.
* @event_msgs: Device events.
*/
struct virtio_snd {
struct virtio_device *vdev;
struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX];
struct snd_card *card;
+ struct list_head ctl_msgs;
struct virtio_snd_event *event_msgs;
};
+/* Message completion timeout in milliseconds (module parameter). */
+extern u32 virtsnd_msg_timeout_ms;
+
static inline struct virtio_snd_queue *
virtsnd_control_queue(struct virtio_snd *snd)
{