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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/media/video/ivtv/ivtv-queue.h
17633 views
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/*

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    buffer queues.

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    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>

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    Copyright (C) 2004  Chris Kennedy <[email protected]>

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    Copyright (C) 2005-2007  Hans Verkuil <[email protected]>

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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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    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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    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  02111-1307  USA

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 */

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#ifndef IVTV_QUEUE_H

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#define IVTV_QUEUE_H

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#define IVTV_DMA_UNMAPPED	((u32) -1)

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#define SLICED_VBI_PIO 0

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/* ivtv_buffer utility functions */

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static inline int ivtv_might_use_pio(struct ivtv_stream *s)

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{

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	return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);

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}

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static inline int ivtv_use_pio(struct ivtv_stream *s)

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{

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	struct ivtv *itv = s->itv;

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	return s->dma == PCI_DMA_NONE ||

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	    (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);

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}

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static inline int ivtv_might_use_dma(struct ivtv_stream *s)

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{

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	return s->dma != PCI_DMA_NONE;

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}

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static inline int ivtv_use_dma(struct ivtv_stream *s)

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{

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	return !ivtv_use_pio(s);

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}

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static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)

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{

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	if (ivtv_use_dma(s))

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		pci_dma_sync_single_for_cpu(s->itv->pdev, buf->dma_handle,

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				s->buf_size + 256, s->dma);

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}

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static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)

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{

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	if (ivtv_use_dma(s))

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		pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle,

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				s->buf_size + 256, s->dma);

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}

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int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);

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void ivtv_buf_swap(struct ivtv_buffer *buf);

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/* ivtv_queue utility functions */

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void ivtv_queue_init(struct ivtv_queue *q);

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void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);

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struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);

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int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,

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		    struct ivtv_queue *to, int needed_bytes);

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void ivtv_flush_queues(struct ivtv_stream *s);

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/* ivtv_stream utility functions */

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int ivtv_stream_alloc(struct ivtv_stream *s);

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void ivtv_stream_free(struct ivtv_stream *s);

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static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)

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{

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	if (ivtv_use_dma(s))

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		pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle,

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			sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);

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}

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static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)

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{

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	if (ivtv_use_dma(s))

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		pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle,

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			sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);

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}

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#endif

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