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File Content: `videobuf-dma-sg.h`

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * helper functions for SG DMA video4linux capture buffers
 *
 * The functions expect the hardware being able to scatter gather
 * (i.e. the buffers are not linear in physical memory, but fragmented
 * into PAGE_SIZE chunks).  They also assume the driver does not need
 * to touch the video data.
 *
 * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
 *
 * Highly based on video-buf written originally by:
 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
 * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
 * (c) 2006 Ted Walther and John Sokol
 */
#ifndef _VIDEOBUF_DMA_SG_H
#define _VIDEOBUF_DMA_SG_H

#include <media/videobuf-core.h>

/* --------------------------------------------------------------------- */

/*
 * A small set of helper functions to manage buffers (both userland
 * and kernel) for DMA.
 *
 * videobuf_dma_init_*()
 *	creates a buffer.  The userland version takes a userspace
 *	pointer + length.  The kernel version just wants the size and
 *	does memory allocation too using vmalloc_32().
 *
 * videobuf_dma_*()
 *	see Documentation/core-api/dma-api-howto.rst, these functions to
 *	basically the same.  The map function does also build a
 *	scatterlist for the buffer (and unmap frees it ...)
 *
 * videobuf_dma_free()
 *	no comment ...
 *
 */

struct videobuf_dmabuf {
	u32                 magic;

	/* for userland buffer */
	int                 offset;
	size_t		    size;
	struct page         **pages;

	/* for kernel buffers */
	void                *vaddr;
	struct page         **vaddr_pages;
	dma_addr_t          *dma_addr;
	struct device       *dev;

	/* for overlay buffers (pci-pci dma) */
	dma_addr_t          bus_addr;

	/* common */
	struct scatterlist  *sglist;
	int                 sglen;
	unsigned long       nr_pages;
	int                 direction;
};

struct videobuf_dma_sg_memory {
	u32                 magic;

	/* for mmap'ed buffers */
	struct videobuf_dmabuf  dma;
};

/*
 * Scatter-gather DMA buffer API.
 *
 * These functions provide a simple way to create a page list and a
 * scatter-gather list from a kernel, userspace of physical address and map the
 * memory for DMA operation.
 *
 * Despite the name, this is totally unrelated to videobuf, except that
 * videobuf-dma-sg uses the same API internally.
 */
int videobuf_dma_free(struct videobuf_dmabuf *dma);

int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma);
struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf);

void *videobuf_sg_alloc(size_t size);

void videobuf_queue_sg_init(struct videobuf_queue *q,
			 const struct videobuf_queue_ops *ops,
			 struct device *dev,
			 spinlock_t *irqlock,
			 enum v4l2_buf_type type,
			 enum v4l2_field field,
			 unsigned int msize,
			 void *priv,
			 struct mutex *ext_lock);

#endif /* _VIDEOBUF_DMA_SG_H */

Name	Size	Permission
davinci	---	0755
drv-intf	---	0755
i2c	---	0755
tpg	---	0755
cec-notifier.h	5146 bytes	0644
cec-pin.h	2853 bytes	0644
cec.h	18230 bytes	0644
demux.h	23237 bytes	0644
dmxdev.h	6008 bytes	0644
dvb-usb-ids.h	19922 bytes	0644
dvb_ca_en50221.h	4455 bytes	0644
dvb_demux.h	11033 bytes	0644
dvb_frontend.h	30751 bytes	0644
dvb_net.h	2300 bytes	0644
dvb_ringbuffer.h	8524 bytes	0644
dvb_vb2.h	7838 bytes	0644
dvbdev.h	14775 bytes	0644
frame_vector.h	1459 bytes	0644
hevc-ctrls.h	10045 bytes	0644
imx.h	190 bytes	0644
media-dev-allocator.h	2261 bytes	0644
media-device.h	18076 bytes	0644
media-devnode.h	5415 bytes	0644
media-entity.h	48244 bytes	0644
media-request.h	12245 bytes	0644
rc-core.h	12562 bytes	0644
rc-map.h	14759 bytes	0644
rcar-fcp.h	1127 bytes	0644
tuner-types.h	7723 bytes	0644
tuner.h	8603 bytes	0644
tveeprom.h	3375 bytes	0644
v4l2-async.h	11545 bytes	0644
v4l2-common.h	20437 bytes	0644
v4l2-ctrls.h	55507 bytes	0644
v4l2-dev.h	20595 bytes	0644
v4l2-device.h	19053 bytes	0644
v4l2-dv-timings.h	9295 bytes	0644
v4l2-event.h	6150 bytes	0644
v4l2-fh.h	4317 bytes	0644
v4l2-flash-led-class.h	5888 bytes	0644
v4l2-fwnode.h	18687 bytes	0644
v4l2-h264.h	2921 bytes	0644
v4l2-image-sizes.h	827 bytes	0644
v4l2-ioctl.h	34326 bytes	0644
v4l2-jpeg.h	5207 bytes	0644
v4l2-mc.h	7860 bytes	0644
v4l2-mediabus.h	8862 bytes	0644
v4l2-mem2mem.h	30106 bytes	0644
v4l2-rect.h	5852 bytes	0644
v4l2-subdev.h	74973 bytes	0644
videobuf-core.h	6974 bytes	0644
videobuf-dma-contig.h	909 bytes	0644
videobuf-dma-sg.h	2856 bytes	0644
videobuf-vmalloc.h	1166 bytes	0644
videobuf2-core.h	53166 bytes	0644
videobuf2-dma-contig.h	883 bytes	0644
videobuf2-dma-sg.h	698 bytes	0644
videobuf2-dvb.h	1857 bytes	0644
videobuf2-memops.h	1119 bytes	0644
videobuf2-v4l2.h	14829 bytes	0644
videobuf2-vmalloc.h	509 bytes	0644
vsp1.h	3652 bytes	0644

File Content: videobuf-dma-sg.h

File Content: `videobuf-dma-sg.h`