[PATCH v9 08/12] virtio-sound: handle VIRTIO_SND_R_PCM_PREPARE

[Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>]

Handles the PCM prepare control request. It initializes a PCM stream
when the guests asks for it.

Based-on: https://github.com/OpenSynergy/qemu/commit/5a2f350eec5d157b90d9c7b40a8e603f4da92471
Signed-off-by: Igor Skalkin <Igor.Skalkin@opensynergy.com>
Signed-off-by: Anton Yakovlev <Anton.Yakovlev@opensynergy.com>
Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 hw/virtio/virtio-snd.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/hw/virtio/virtio-snd.c b/hw/virtio/virtio-snd.c
index 29a70cd7e8..343afc0531 100644
--- a/hw/virtio/virtio-snd.c
+++ b/hw/virtio/virtio-snd.c
@@ -452,6 +452,28 @@ static const char *print_code(uint32_t code)
     #undef CASE
 };
 
+/*
+ * Handles VIRTIO_SND_R_PCM_PREPARE.
+ *
+ * @s: VirtIOSound device
+ * @cmd: The request command queue element from VirtIOSound cmdq field
+ */
+static void virtio_snd_handle_pcm_prepare(VirtIOSound *s,
+                                          virtio_snd_ctrl_command *cmd)
+{
+    uint32_t stream_id;
+    size_t msg_sz = iov_to_buf(cmd->elem->out_sg,
+                               cmd->elem->out_num,
+                               sizeof(virtio_snd_hdr),
+                               &stream_id,
+                               sizeof(stream_id));
+
+    stream_id = le32_to_cpu(stream_id);
+    cmd->resp.code = msg_sz == sizeof(uint32_t)
+                   ? virtio_snd_pcm_prepare(s, stream_id)
+                   : cpu_to_le32(VIRTIO_SND_S_BAD_MSG);
+}
+
 /*
  * Handles VIRTIO_SND_R_PCM_START.
  *
@@ -535,6 +557,8 @@ process_cmd(VirtIOSound *s, virtio_snd_ctrl_command *cmd)
         virtio_snd_handle_pcm_set_params(s, cmd);
         break;
     case VIRTIO_SND_R_PCM_PREPARE:
+        virtio_snd_handle_pcm_prepare(s, cmd);
+        break;
     case VIRTIO_SND_R_PCM_RELEASE:
         cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_NOT_SUPP);
         break;
-- 
2.39.2