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virtio-sound: handle VIRTIO_SND_R_PCM_PREPARE

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

Based-on: 5a2f350eec
Signed-off-by: Igor Skalkin <Igor.Skalkin@opensynergy.com>
Signed-off-by: Anton Yakovlev <Anton.Yakovlev@opensynergy.com>
Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <c6a9c437ef48e45f083fc957dcf7fe18a028e657.1698062525.git.manos.pitsidianakis@linaro.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Manos Pitsidianakis 2023-10-23 15:03:24 +03:00 committed by Michael S. Tsirkin
parent 64704ce04b
commit e5788b8fbf
1 changed files with 24 additions and 0 deletions
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24
hw/audio/virtio-snd.c
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@ -478,6 +478,28 @@ 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(stream_id)
? virtio_snd_pcm_prepare(s, stream_id)
: cpu_to_le32(VIRTIO_SND_S_BAD_MSG);
}
/*
* Handles VIRTIO_SND_R_PCM_START.
*
@ -569,6 +591,8 @@ 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;