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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/media/video/cx18/cx18-queue.h
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/*

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 *  cx18 buffer queues

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 *

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 *  Derived from ivtv-queue.h

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 *

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 *  Copyright (C) 2007  Hans Verkuil <[email protected]>

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 *  Copyright (C) 2008  Andy Walls <[email protected]>

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 *

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 *  This program is free software; you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation; either version 2 of the License, or

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 *  (at your option) any later version.

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 *

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 *  This program is distributed in the hope that it will be useful,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License

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 *  along with this program; if not, write to the Free Software

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 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

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 *  02111-1307  USA

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 */

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#define CX18_DMA_UNMAPPED	((u32) -1)

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/* cx18_buffer utility functions */

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static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,

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	struct cx18_buffer *buf)

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{

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	pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle,

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				s->buf_size, s->dma);

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}

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static inline void cx18_buf_sync_for_device(struct cx18_stream *s,

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	struct cx18_buffer *buf)

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{

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	pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle,

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				s->buf_size, s->dma);

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}

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void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);

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static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,

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					    struct cx18_mdl *mdl)

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{

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	if (list_is_singular(&mdl->buf_list))

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		cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,

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							     struct cx18_buffer,

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							     list));

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	else

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		_cx18_mdl_sync_for_device(s, mdl);

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}

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void cx18_buf_swap(struct cx18_buffer *buf);

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void _cx18_mdl_swap(struct cx18_mdl *mdl);

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static inline void cx18_mdl_swap(struct cx18_mdl *mdl)

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{

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	if (list_is_singular(&mdl->buf_list))

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		cx18_buf_swap(list_first_entry(&mdl->buf_list,

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					       struct cx18_buffer, list));

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	else

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		_cx18_mdl_swap(mdl);

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}

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/* cx18_queue utility functions */

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struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,

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				 struct cx18_queue *q, int to_front);

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static inline

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struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,

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				struct cx18_queue *q)

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{

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	return _cx18_enqueue(s, mdl, q, 0); /* FIFO */

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}

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static inline

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struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,

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			     struct cx18_queue *q)

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{

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	return _cx18_enqueue(s, mdl, q, 1); /* LIFO */

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}

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void cx18_queue_init(struct cx18_queue *q);

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struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);

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struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,

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	u32 bytesused);

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void cx18_flush_queues(struct cx18_stream *s);

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/* queue MDL reconfiguration helpers */

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void cx18_unload_queues(struct cx18_stream *s);

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void cx18_load_queues(struct cx18_stream *s);

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/* cx18_stream utility functions */

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int cx18_stream_alloc(struct cx18_stream *s);

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void cx18_stream_free(struct cx18_stream *s);

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