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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>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* virtio-snd: Virtio sound device
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* Copyright (C) 2021 OpenSynergy GmbH
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*/
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#ifndef VIRTIO_SND_CARD_H
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#define VIRTIO_SND_CARD_H
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#include <linux/slab.h>
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#include <linux/virtio.h>
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#include <sound/core.h>
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#include <uapi/linux/virtio_snd.h>
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#include "virtio_ctl_msg.h"
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#define VIRTIO_SND_CARD_DRIVER "virtio-snd"
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#define VIRTIO_SND_CARD_NAME "VirtIO SoundCard"
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/**
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* struct virtio_snd_queue - Virtqueue wrapper structure.
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* @lock: Used to synchronize access to a virtqueue.
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* @vqueue: Underlying virtqueue.
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*/
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struct virtio_snd_queue {
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spinlock_t lock;
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struct virtqueue *vqueue;
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};
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/**
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* struct virtio_snd - VirtIO sound card device.
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* @vdev: Underlying virtio device.
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* @queues: Virtqueue wrappers.
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* @card: ALSA sound card.
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* @ctl_msgs: Pending control request list.
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* @event_msgs: Device events.
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*/
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struct virtio_snd {
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struct virtio_device *vdev;
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struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX];
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struct snd_card *card;
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struct list_head ctl_msgs;
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struct virtio_snd_event *event_msgs;
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};
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/* Message completion timeout in milliseconds (module parameter). */
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extern u32 virtsnd_msg_timeout_ms;
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static inline struct virtio_snd_queue *
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virtsnd_control_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_CONTROL];
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}
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static inline struct virtio_snd_queue *
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virtsnd_event_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_EVENT];
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}
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static inline struct virtio_snd_queue *
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virtsnd_tx_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_TX];
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}
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static inline struct virtio_snd_queue *
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virtsnd_rx_queue(struct virtio_snd *snd)
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{
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return &snd->queues[VIRTIO_SND_VQ_RX];
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}
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#endif /* VIRTIO_SND_CARD_H */
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