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1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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 <c@groovy.org>
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Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
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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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