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https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
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9d45e514da
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>
79 lines
2.3 KiB
C
79 lines
2.3 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_MSG_H
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#define VIRTIO_SND_MSG_H
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#include <linux/atomic.h>
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#include <linux/virtio.h>
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struct virtio_snd;
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struct virtio_snd_msg;
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void virtsnd_ctl_msg_ref(struct virtio_snd_msg *msg);
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void virtsnd_ctl_msg_unref(struct virtio_snd_msg *msg);
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void *virtsnd_ctl_msg_request(struct virtio_snd_msg *msg);
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void *virtsnd_ctl_msg_response(struct virtio_snd_msg *msg);
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struct virtio_snd_msg *virtsnd_ctl_msg_alloc(size_t request_size,
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size_t response_size, gfp_t gfp);
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int virtsnd_ctl_msg_send(struct virtio_snd *snd, struct virtio_snd_msg *msg,
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struct scatterlist *out_sgs,
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struct scatterlist *in_sgs, bool nowait);
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/**
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* virtsnd_ctl_msg_send_sync() - Simplified sending of synchronous message.
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* @snd: VirtIO sound device.
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* @msg: Control message.
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*
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* After returning from this function, the message will be deleted. If message
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* content is still needed, the caller must additionally to
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* virtsnd_ctl_msg_ref/unref() it.
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*
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* The msg_timeout_ms module parameter defines the message completion timeout.
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* If the message is not completed within this time, the function will return an
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* error.
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*
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* Context: Any context that permits to sleep.
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* Return: 0 on success, -errno on failure.
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*
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* The return value is a message status code (VIRTIO_SND_S_XXX) converted to an
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* appropriate -errno value.
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*/
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static inline int virtsnd_ctl_msg_send_sync(struct virtio_snd *snd,
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struct virtio_snd_msg *msg)
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{
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return virtsnd_ctl_msg_send(snd, msg, NULL, NULL, false);
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}
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/**
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* virtsnd_ctl_msg_send_async() - Simplified sending of asynchronous message.
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* @snd: VirtIO sound device.
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* @msg: Control message.
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*
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* Context: Any context.
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* Return: 0 on success, -errno on failure.
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*/
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static inline int virtsnd_ctl_msg_send_async(struct virtio_snd *snd,
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struct virtio_snd_msg *msg)
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{
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return virtsnd_ctl_msg_send(snd, msg, NULL, NULL, true);
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}
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void virtsnd_ctl_msg_cancel_all(struct virtio_snd *snd);
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void virtsnd_ctl_msg_complete(struct virtio_snd_msg *msg);
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int virtsnd_ctl_query_info(struct virtio_snd *snd, int command, int start_id,
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int count, size_t size, void *info);
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void virtsnd_ctl_notify_cb(struct virtqueue *vqueue);
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#endif /* VIRTIO_SND_MSG_H */
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