[PATCH v7 07/12] virtio-sound: handle VIRTIO_SND_PCM_SET_PARAMS

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

Handle the set parameters control request. It reconfigures a stream
based on a guest's preference if the values are valid and supported.

Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
---
 hw/virtio/trace-events |  1 +
 hw/virtio/virtio-snd.c | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 8eae1bf881..f70cde4f01 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -163,6 +163,7 @@ 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_pcm_set_params(uint32_t stream) "VIRTIO_SND_PCM_SET_PARAMS called for stream %"PRIu32
 virtio_snd_handle_ctrl(void *vdev, void *vq) "snd %p: handle ctrl event for queue %p"
 virtio_snd_handle_pcm_info(uint32_t stream) "VIRTIO_SND_R_PCM_INFO called for stream %"PRIu32
 virtio_snd_handle_pcm_start_stop(const char *code, uint32_t stream) "%s called for stream %"PRIu32
diff --git a/hw/virtio/virtio-snd.c b/hw/virtio/virtio-snd.c
index 6946309e40..b9d17c29a4 100644
--- a/hw/virtio/virtio-snd.c
+++ b/hw/virtio/virtio-snd.c
@@ -266,6 +266,30 @@ uint32_t virtio_snd_pcm_set_params_impl(VirtIOSound *s,
     return VIRTIO_SND_S_OK;
 }
 
+/*
+ * Handles the VIRTIO_SND_R_PCM_SET_PARAMS request.
+ *
+ * @s: VirtIOSound device
+ * @cmd: The request command queue element from VirtIOSound cmdq field
+ */
+static void virtio_snd_handle_pcm_set_params(VirtIOSound *s,
+                                             virtio_snd_ctrl_command *cmd)
+{
+    virtio_snd_pcm_set_params req;
+    size_t sz = iov_to_buf(cmd->elem->out_sg,
+                           cmd->elem->out_num,
+                           0,
+                           &req,
+                           sizeof(req));
+    if (sz != sizeof(virtio_snd_pcm_set_params)) {
+        cmd->resp.code = VIRTIO_SND_S_BAD_MSG;
+        return;
+    }
+
+    trace_virtio_snd_handle_pcm_set_params(req.hdr.stream_id);
+    cmd->resp.code = virtio_snd_pcm_set_params_impl(s, &req);
+}
+
 /*
  * Get a QEMU Audiosystem compatible format value from a VIRTIO_SND_PCM_FMT_*
  */
@@ -482,6 +506,8 @@ process_cmd(VirtIOSound *s, virtio_snd_ctrl_command *cmd)
         virtio_snd_handle_pcm_start_stop(s, cmd, false);
         break;
     case VIRTIO_SND_R_PCM_SET_PARAMS:
+        virtio_snd_handle_pcm_set_params(s, cmd);
+        break;
     case VIRTIO_SND_R_PCM_PREPARE:
     case VIRTIO_SND_R_PCM_RELEASE:
         cmd->resp.code = VIRTIO_SND_S_NOT_SUPP;
-- 
2.39.2