/* SPDX-License-Identifier: GPL-2.0-or-later */ /* buffer queues. Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> Copyright (C) 2004 Chris Kennedy <c@groovy.org> Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl> */ #ifndef IVTV_QUEUE_H #define IVTV_QUEUE_H #define IVTV_DMA_UNMAPPED ((u32) -1) #define SLICED_VBI_PIO 0 /* ivtv_buffer utility functions */ static inline int ivtv_might_use_pio(struct ivtv_stream *s) { return s->dma == DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI); } static inline int ivtv_use_pio(struct ivtv_stream *s) { struct ivtv *itv = s->itv; return s->dma == DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set); } static inline int ivtv_might_use_dma(struct ivtv_stream *s) { return s->dma != DMA_NONE; } static inline int ivtv_use_dma(struct ivtv_stream *s) { return !ivtv_use_pio(s); } static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf) { if (ivtv_use_dma(s)) dma_sync_single_for_cpu(&s->itv->pdev->dev, buf->dma_handle, s->buf_size + 256, s->dma); } static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf) { if (ivtv_use_dma(s)) dma_sync_single_for_device(&s->itv->pdev->dev, buf->dma_handle, s->buf_size + 256, s->dma); } int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes); void ivtv_buf_swap(struct ivtv_buffer *buf); /* ivtv_queue utility functions */ void ivtv_queue_init(struct ivtv_queue *q); void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q); struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q); int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal, struct ivtv_queue *to, int needed_bytes); void ivtv_flush_queues(struct ivtv_stream *s); /* ivtv_stream utility functions */ int ivtv_stream_alloc(struct ivtv_stream *s); void ivtv_stream_free(struct ivtv_stream *s); static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s) { if (ivtv_use_dma(s)) dma_sync_single_for_cpu(&s->itv->pdev->dev, s->sg_handle, sizeof(struct ivtv_sg_element), DMA_TO_DEVICE); } static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s) { if (ivtv_use_dma(s)) dma_sync_single_for_device(&s->itv->pdev->dev, s->sg_handle, sizeof(struct ivtv_sg_element), DMA_TO_DEVICE); } #endif