cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ivtv-queue.h (2559B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3    buffer queues.
      4    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
      5    Copyright (C) 2004  Chris Kennedy <c@groovy.org>
      6    Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
      7
      8 */
      9
     10#ifndef IVTV_QUEUE_H
     11#define IVTV_QUEUE_H
     12
     13#define IVTV_DMA_UNMAPPED	((u32) -1)
     14#define SLICED_VBI_PIO 0
     15
     16/* ivtv_buffer utility functions */
     17
     18static inline int ivtv_might_use_pio(struct ivtv_stream *s)
     19{
     20	return s->dma == DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI);
     21}
     22
     23static inline int ivtv_use_pio(struct ivtv_stream *s)
     24{
     25	struct ivtv *itv = s->itv;
     26
     27	return s->dma == DMA_NONE ||
     28	    (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set);
     29}
     30
     31static inline int ivtv_might_use_dma(struct ivtv_stream *s)
     32{
     33	return s->dma != DMA_NONE;
     34}
     35
     36static inline int ivtv_use_dma(struct ivtv_stream *s)
     37{
     38	return !ivtv_use_pio(s);
     39}
     40
     41static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf)
     42{
     43	if (ivtv_use_dma(s))
     44		dma_sync_single_for_cpu(&s->itv->pdev->dev, buf->dma_handle,
     45					s->buf_size + 256, s->dma);
     46}
     47
     48static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf)
     49{
     50	if (ivtv_use_dma(s))
     51		dma_sync_single_for_device(&s->itv->pdev->dev,
     52					   buf->dma_handle, s->buf_size + 256,
     53					   s->dma);
     54}
     55
     56int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
     57void ivtv_buf_swap(struct ivtv_buffer *buf);
     58
     59/* ivtv_queue utility functions */
     60void ivtv_queue_init(struct ivtv_queue *q);
     61void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
     62struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
     63int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
     64		    struct ivtv_queue *to, int needed_bytes);
     65void ivtv_flush_queues(struct ivtv_stream *s);
     66
     67/* ivtv_stream utility functions */
     68int ivtv_stream_alloc(struct ivtv_stream *s);
     69void ivtv_stream_free(struct ivtv_stream *s);
     70
     71static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
     72{
     73	if (ivtv_use_dma(s))
     74		dma_sync_single_for_cpu(&s->itv->pdev->dev, s->sg_handle,
     75					sizeof(struct ivtv_sg_element),
     76					DMA_TO_DEVICE);
     77}
     78
     79static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
     80{
     81	if (ivtv_use_dma(s))
     82		dma_sync_single_for_device(&s->itv->pdev->dev, s->sg_handle,
     83					   sizeof(struct ivtv_sg_element),
     84					   DMA_TO_DEVICE);
     85}
     86
     87#endif