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/* 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 | Type | Size | Permission | Actions |
|---|---|---|---|---|
| davinci | Folder | 0755 |
|
|
| drv-intf | Folder | 0755 |
|
|
| i2c | Folder | 0755 |
|
|
| tpg | Folder | 0755 |
|
|
| cec-notifier.h | File | 5.03 KB | 0644 |
|
| cec-pin.h | File | 2.79 KB | 0644 |
|
| cec.h | File | 17.87 KB | 0644 |
|
| demux.h | File | 22.69 KB | 0644 |
|
| dmxdev.h | File | 5.87 KB | 0644 |
|
| dvb-usb-ids.h | File | 19.46 KB | 0644 |
|
| dvb_ca_en50221.h | File | 4.35 KB | 0644 |
|
| dvb_demux.h | File | 10.77 KB | 0644 |
|
| dvb_frontend.h | File | 30.03 KB | 0644 |
|
| dvb_net.h | File | 2.25 KB | 0644 |
|
| dvb_ringbuffer.h | File | 8.32 KB | 0644 |
|
| dvb_vb2.h | File | 7.65 KB | 0644 |
|
| dvbdev.h | File | 14.43 KB | 0644 |
|
| frame_vector.h | File | 1.42 KB | 0644 |
|
| hevc-ctrls.h | File | 9.81 KB | 0644 |
|
| imx.h | File | 190 B | 0644 |
|
| jpeg.h | File | 500 B | 0644 |
|
| media-dev-allocator.h | File | 2.21 KB | 0644 |
|
| media-device.h | File | 17.65 KB | 0644 |
|
| media-devnode.h | File | 5.29 KB | 0644 |
|
| media-entity.h | File | 47.11 KB | 0644 |
|
| media-request.h | File | 11.96 KB | 0644 |
|
| rc-core.h | File | 12.27 KB | 0644 |
|
| rc-map.h | File | 14.41 KB | 0644 |
|
| rcar-fcp.h | File | 1.1 KB | 0644 |
|
| tuner-types.h | File | 7.54 KB | 0644 |
|
| tuner.h | File | 8.4 KB | 0644 |
|
| tveeprom.h | File | 3.3 KB | 0644 |
|
| v4l2-async.h | File | 11.27 KB | 0644 |
|
| v4l2-common.h | File | 19.96 KB | 0644 |
|
| v4l2-ctrls.h | File | 54.21 KB | 0644 |
|
| v4l2-dev.h | File | 20.11 KB | 0644 |
|
| v4l2-device.h | File | 18.61 KB | 0644 |
|
| v4l2-dv-timings.h | File | 9.08 KB | 0644 |
|
| v4l2-event.h | File | 6.01 KB | 0644 |
|
| v4l2-fh.h | File | 4.22 KB | 0644 |
|
| v4l2-flash-led-class.h | File | 5.75 KB | 0644 |
|
| v4l2-fwnode.h | File | 18.25 KB | 0644 |
|
| v4l2-h264.h | File | 2.85 KB | 0644 |
|
| v4l2-image-sizes.h | File | 827 B | 0644 |
|
| v4l2-ioctl.h | File | 33.52 KB | 0644 |
|
| v4l2-jpeg.h | File | 5.08 KB | 0644 |
|
| v4l2-mc.h | File | 7.78 KB | 0644 |
|
| v4l2-mediabus.h | File | 8.65 KB | 0644 |
|
| v4l2-mem2mem.h | File | 29.4 KB | 0644 |
|
| v4l2-rect.h | File | 5.71 KB | 0644 |
|
| v4l2-subdev.h | File | 73.22 KB | 0644 |
|
| videobuf-core.h | File | 6.81 KB | 0644 |
|
| videobuf-dma-contig.h | File | 909 B | 0644 |
|
| videobuf-dma-sg.h | File | 2.79 KB | 0644 |
|
| videobuf-vmalloc.h | File | 1.14 KB | 0644 |
|
| videobuf2-core.h | File | 51.92 KB | 0644 |
|
| videobuf2-dma-contig.h | File | 883 B | 0644 |
|
| videobuf2-dma-sg.h | File | 698 B | 0644 |
|
| videobuf2-dvb.h | File | 1.81 KB | 0644 |
|
| videobuf2-memops.h | File | 1.09 KB | 0644 |
|
| videobuf2-v4l2.h | File | 14.48 KB | 0644 |
|
| videobuf2-vmalloc.h | File | 509 B | 0644 |
|
| vsp1.h | File | 3.57 KB | 0644 |
|