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78 lines
2.3 KiB
78 lines
2.3 KiB
/* 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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