virtio-sound: handle control messages and streams

Receive guest requests in the control (CTRL) queue of the virtio sound
device and reply with a NOT SUPPORTED error to all control commands.

The receiving handler is virtio_snd_handle_ctrl(). It stores all control
messages in the queue in the device's command queue. Then it calls
virtio_snd_process_cmdq() to handle each message.

The handler is process_cmd() which replies with VIRTIO_SND_S_NOT_SUPP.

Based-on: OpenSynergy/qemu@5a2f350
Signed-off-by: Igor Skalkin <[email protected]>
Signed-off-by: Anton Yakovlev <[email protected]>
Signed-off-by: Manos Pitsidianakis <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Tested-by: Alex Bennée <[email protected]>
Message-Id: <3224aff87e7c4f2777bfe1bbbbca93b72525992c.1698062525.git.manos.pitsidianakis@linaro.org>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

Author: epilys

hw/audio/trace-events

@@ -47,3 +47,7 @@ virtio_snd_vm_state_running(void) "vm state running"
 virtio_snd_vm_state_stopped(void) "vm state stopped"
 virtio_snd_realize(void *snd) "snd %p: realize"
 virtio_snd_unrealize(void *snd) "snd %p: unrealize"
+virtio_snd_handle_ctrl(void *vdev, void *vq) "snd %p: handle ctrl event for queue %p"
+virtio_snd_handle_code(uint32_t val, const char *code) "ctrl code msg val = %"PRIu32" == %s"
+virtio_snd_handle_chmap_info(void) "VIRTIO_SND_CHMAP_INFO called"
+virtio_snd_handle_event(void) "event queue callback called"