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Pawel Osciake23ccc02010-10-11 10:56:41 -03001/*
Junghak Sungc1399902015-09-22 10:30:29 -03002 * videobuf2-core.h - Video Buffer 2 Core Framework
Pawel Osciake23ccc02010-10-11 10:56:41 -03003 *
4 * Copyright (C) 2010 Samsung Electronics
5 *
Pawel Osciak95072082011-03-13 15:23:32 -03006 * Author: Pawel Osciak <pawel@osciak.com>
Pawel Osciake23ccc02010-10-11 10:56:41 -03007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation.
11 */
12#ifndef _MEDIA_VIDEOBUF2_CORE_H
13#define _MEDIA_VIDEOBUF2_CORE_H
14
15#include <linux/mm_types.h>
16#include <linux/mutex.h>
17#include <linux/poll.h>
Sumit Semwalc5384042012-06-14 10:37:37 -030018#include <linux/dma-buf.h>
Pawel Osciake23ccc02010-10-11 10:56:41 -030019
Junghak Sungbed04f92015-10-06 06:37:47 -030020#define VB2_MAX_FRAME (32)
21#define VB2_MAX_PLANES (8)
22
23enum vb2_memory {
24 VB2_MEMORY_UNKNOWN = 0,
25 VB2_MEMORY_MMAP = 1,
26 VB2_MEMORY_USERPTR = 2,
27 VB2_MEMORY_DMABUF = 4,
28};
29
Marek Szyprowskib25748f2010-12-06 05:56:55 -030030struct vb2_fileio_data;
Hans Verkuil3415a892014-04-14 07:33:00 -030031struct vb2_threadio_data;
Pawel Osciake23ccc02010-10-11 10:56:41 -030032
33/**
34 * struct vb2_mem_ops - memory handling/memory allocator operations
35 * @alloc: allocate video memory and, optionally, allocator private data,
36 * return NULL on failure or a pointer to allocator private,
37 * per-buffer data on success; the returned private structure
38 * will then be passed as buf_priv argument to other ops in this
Hans Verkuilb6ba2052013-03-01 15:44:20 -030039 * structure. Additional gfp_flags to use when allocating the
40 * are also passed to this operation. These flags are from the
41 * gfp_flags field of vb2_queue.
Pawel Osciake23ccc02010-10-11 10:56:41 -030042 * @put: inform the allocator that the buffer will no longer be used;
43 * usually will result in the allocator freeing the buffer (if
44 * no other users of this buffer are present); the buf_priv
45 * argument is the allocator private per-buffer structure
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030046 * previously returned from the alloc callback.
Mauro Carvalho Chehab32d81b42015-10-01 13:59:29 -030047 * @get_dmabuf: acquire userspace memory for a hardware operation; used for
48 * DMABUF memory types.
Pawel Osciake23ccc02010-10-11 10:56:41 -030049 * @get_userptr: acquire userspace memory for a hardware operation; used for
50 * USERPTR memory types; vaddr is the address passed to the
51 * videobuf layer when queuing a video buffer of USERPTR type;
52 * should return an allocator private per-buffer structure
53 * associated with the buffer on success, NULL on failure;
54 * the returned private structure will then be passed as buf_priv
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030055 * argument to other ops in this structure.
Pawel Osciake23ccc02010-10-11 10:56:41 -030056 * @put_userptr: inform the allocator that a USERPTR buffer will no longer
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030057 * be used.
Sumit Semwalc5384042012-06-14 10:37:37 -030058 * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation;
Hans Verkuil36c0f8b2016-04-15 09:15:05 -030059 * used for DMABUF memory types; dev is the alloc device
Sumit Semwalc5384042012-06-14 10:37:37 -030060 * dbuf is the shared dma_buf; returns NULL on failure;
61 * allocator private per-buffer structure on success;
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030062 * this needs to be used for further accesses to the buffer.
Sumit Semwalc5384042012-06-14 10:37:37 -030063 * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF
64 * buffer is no longer used; the buf_priv argument is the
65 * allocator private per-buffer structure previously returned
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030066 * from the attach_dmabuf callback.
Sumit Semwalc5384042012-06-14 10:37:37 -030067 * @map_dmabuf: request for access to the dmabuf from allocator; the allocator
68 * of dmabuf is informed that this driver is going to use the
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030069 * dmabuf.
Sumit Semwalc5384042012-06-14 10:37:37 -030070 * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030071 * that this driver is done using the dmabuf for now.
Marek Szyprowski3e0c2f22012-06-14 10:37:43 -030072 * @prepare: called every time the buffer is passed from userspace to the
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030073 * driver, useful for cache synchronisation, optional.
Marek Szyprowski3e0c2f22012-06-14 10:37:43 -030074 * @finish: called every time the buffer is passed back from the driver
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030075 * to the userspace, also optional.
Pawel Osciake23ccc02010-10-11 10:56:41 -030076 * @vaddr: return a kernel virtual address to a given memory buffer
77 * associated with the passed private structure or NULL if no
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030078 * such mapping exists.
Pawel Osciake23ccc02010-10-11 10:56:41 -030079 * @cookie: return allocator specific cookie for a given memory buffer
80 * associated with the passed private structure or NULL if not
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030081 * available.
Pawel Osciake23ccc02010-10-11 10:56:41 -030082 * @num_users: return the current number of users of a memory buffer;
83 * return 1 if the videobuf layer (or actually the driver using
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030084 * it) is the only user.
Pawel Osciake23ccc02010-10-11 10:56:41 -030085 * @mmap: setup a userspace mapping for a given memory buffer under
Hans Verkuil3f12e6b2014-02-28 12:25:28 -030086 * the provided virtual memory region.
Pawel Osciake23ccc02010-10-11 10:56:41 -030087 *
Mauro Carvalho Chehab89cb3dd2016-07-17 08:44:08 -030088 * Those operations are used by the videobuf2 core to implement the memory
89 * handling/memory allocators for each type of supported streaming I/O method.
90 *
91 * .. note::
92 * #) Required ops for USERPTR types: get_userptr, put_userptr.
93 *
94 * #) Required ops for MMAP types: alloc, put, num_users, mmap.
95 *
96 * #) Required ops for read/write access types: alloc, put, num_users, vaddr.
97 *
98 * #) Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf, unmap_dmabuf.
Pawel Osciake23ccc02010-10-11 10:56:41 -030099 */
100struct vb2_mem_ops {
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300101 void *(*alloc)(struct device *dev, const struct dma_attrs *attrs,
Hans Verkuild16e8322016-04-15 09:15:05 -0300102 unsigned long size, enum dma_data_direction dma_dir,
Hans Verkuild935c572014-11-18 09:50:59 -0300103 gfp_t gfp_flags);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300104 void (*put)(void *buf_priv);
Philipp Zabelea3aba82013-05-21 05:11:35 -0300105 struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300106
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300107 void *(*get_userptr)(struct device *dev, unsigned long vaddr,
Hans Verkuilcd474032014-11-18 09:50:58 -0300108 unsigned long size,
109 enum dma_data_direction dma_dir);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300110 void (*put_userptr)(void *buf_priv);
111
Marek Szyprowski3e0c2f22012-06-14 10:37:43 -0300112 void (*prepare)(void *buf_priv);
113 void (*finish)(void *buf_priv);
114
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300115 void *(*attach_dmabuf)(struct device *dev, struct dma_buf *dbuf,
Hans Verkuilcd474032014-11-18 09:50:58 -0300116 unsigned long size,
117 enum dma_data_direction dma_dir);
Sumit Semwalc5384042012-06-14 10:37:37 -0300118 void (*detach_dmabuf)(void *buf_priv);
119 int (*map_dmabuf)(void *buf_priv);
120 void (*unmap_dmabuf)(void *buf_priv);
121
Pawel Osciake23ccc02010-10-11 10:56:41 -0300122 void *(*vaddr)(void *buf_priv);
123 void *(*cookie)(void *buf_priv);
124
125 unsigned int (*num_users)(void *buf_priv);
126
127 int (*mmap)(void *buf_priv, struct vm_area_struct *vma);
128};
129
Junghak Sung2d700712015-09-22 10:30:30 -0300130/**
131 * struct vb2_plane - plane information
132 * @mem_priv: private data with this plane
133 * @dbuf: dma_buf - shared buffer object
134 * @dbuf_mapped: flag to show whether dbuf is mapped or not
135 * @bytesused: number of bytes occupied by data in the plane (payload)
136 * @length: size of this plane (NOT the payload) in bytes
Hans Verkuil58e1ba32015-11-20 09:40:14 -0200137 * @min_length: minimum required size of this plane (NOT the payload) in bytes.
138 * @length is always greater or equal to @min_length.
Mauro Carvalho Chehab32d81b42015-10-01 13:59:29 -0300139 * @offset: when memory in the associated struct vb2_buffer is
Junghak Sung2d700712015-09-22 10:30:30 -0300140 * VB2_MEMORY_MMAP, equals the offset from the start of
141 * the device memory for this plane (or is a "cookie" that
142 * should be passed to mmap() called on the video node)
143 * @userptr: when memory is VB2_MEMORY_USERPTR, a userspace pointer
144 * pointing to this plane
145 * @fd: when memory is VB2_MEMORY_DMABUF, a userspace file
146 * descriptor associated with this plane
Mauro Carvalho Chehab32d81b42015-10-01 13:59:29 -0300147 * @m: Union with memtype-specific data (@offset, @userptr or
148 * @fd).
Junghak Sung2d700712015-09-22 10:30:30 -0300149 * @data_offset: offset in the plane to the start of data; usually 0,
150 * unless there is a header in front of the data
151 * Should contain enough information to be able to cover all the fields
152 * of struct v4l2_plane at videodev2.h
153 */
Pawel Osciake23ccc02010-10-11 10:56:41 -0300154struct vb2_plane {
155 void *mem_priv;
Sumit Semwalc5384042012-06-14 10:37:37 -0300156 struct dma_buf *dbuf;
157 unsigned int dbuf_mapped;
Junghak Sung2d700712015-09-22 10:30:30 -0300158 unsigned int bytesused;
159 unsigned int length;
Hans Verkuil58e1ba32015-11-20 09:40:14 -0200160 unsigned int min_length;
Junghak Sung2d700712015-09-22 10:30:30 -0300161 union {
162 unsigned int offset;
163 unsigned long userptr;
164 int fd;
165 } m;
166 unsigned int data_offset;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300167};
168
169/**
170 * enum vb2_io_modes - queue access methods
171 * @VB2_MMAP: driver supports MMAP with streaming API
172 * @VB2_USERPTR: driver supports USERPTR with streaming API
173 * @VB2_READ: driver supports read() style access
174 * @VB2_WRITE: driver supports write() style access
Sumit Semwalc5384042012-06-14 10:37:37 -0300175 * @VB2_DMABUF: driver supports DMABUF with streaming API
Pawel Osciake23ccc02010-10-11 10:56:41 -0300176 */
177enum vb2_io_modes {
178 VB2_MMAP = (1 << 0),
179 VB2_USERPTR = (1 << 1),
180 VB2_READ = (1 << 2),
181 VB2_WRITE = (1 << 3),
Sumit Semwalc5384042012-06-14 10:37:37 -0300182 VB2_DMABUF = (1 << 4),
Pawel Osciake23ccc02010-10-11 10:56:41 -0300183};
184
185/**
Pawel Osciake23ccc02010-10-11 10:56:41 -0300186 * enum vb2_buffer_state - current video buffer state
187 * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control
Hans Verkuilb18a8ff2013-12-13 13:13:38 -0300188 * @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf
Guennadi Liakhovetskiebc087d2011-08-31 06:51:10 -0300189 * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver
Pawel Osciake23ccc02010-10-11 10:56:41 -0300190 * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver
Sakari Ailus6d058c52015-07-03 04:37:07 -0300191 * @VB2_BUF_STATE_REQUEUEING: re-queue a buffer to the driver
Pawel Osciake23ccc02010-10-11 10:56:41 -0300192 * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used
193 * in a hardware operation
194 * @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but
195 * not yet dequeued to userspace
196 * @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer
197 * has ended with an error, which will be reported
198 * to the userspace when it is dequeued
199 */
200enum vb2_buffer_state {
201 VB2_BUF_STATE_DEQUEUED,
Hans Verkuilb18a8ff2013-12-13 13:13:38 -0300202 VB2_BUF_STATE_PREPARING,
Guennadi Liakhovetskiebc087d2011-08-31 06:51:10 -0300203 VB2_BUF_STATE_PREPARED,
Pawel Osciake23ccc02010-10-11 10:56:41 -0300204 VB2_BUF_STATE_QUEUED,
Sakari Ailus6d058c52015-07-03 04:37:07 -0300205 VB2_BUF_STATE_REQUEUEING,
Pawel Osciake23ccc02010-10-11 10:56:41 -0300206 VB2_BUF_STATE_ACTIVE,
207 VB2_BUF_STATE_DONE,
208 VB2_BUF_STATE_ERROR,
209};
210
211struct vb2_queue;
212
213/**
214 * struct vb2_buffer - represents a video buffer
Pawel Osciake23ccc02010-10-11 10:56:41 -0300215 * @vb2_queue: the queue to which this driver belongs
Junghak Sung2d700712015-09-22 10:30:30 -0300216 * @index: id number of the buffer
217 * @type: buffer type
218 * @memory: the method, in which the actual data is passed
Pawel Osciake23ccc02010-10-11 10:56:41 -0300219 * @num_planes: number of planes in the buffer
220 * on an internal driver queue
Junghak Sung2d700712015-09-22 10:30:30 -0300221 * @planes: private per-plane information; do not change
Junghak Sungd6dd6452015-11-03 08:16:37 -0200222 * @timestamp: frame timestamp in ns
Pawel Osciake23ccc02010-10-11 10:56:41 -0300223 */
224struct vb2_buffer {
Pawel Osciake23ccc02010-10-11 10:56:41 -0300225 struct vb2_queue *vb2_queue;
Junghak Sung2d700712015-09-22 10:30:30 -0300226 unsigned int index;
227 unsigned int type;
228 unsigned int memory;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300229 unsigned int num_planes;
Junghak Sungbed04f92015-10-06 06:37:47 -0300230 struct vb2_plane planes[VB2_MAX_PLANES];
Junghak Sungd6dd6452015-11-03 08:16:37 -0200231 u64 timestamp;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300232
Mauro Carvalho Chehabefe98012015-10-05 09:12:56 -0300233 /* private: internal use only
234 *
235 * state: current buffer state; do not change
236 * queued_entry: entry on the queued buffers list, which holds
237 * all buffers queued from userspace
238 * done_entry: entry on the list that stores all buffers ready
239 * to be dequeued to userspace
240 */
Pawel Osciake23ccc02010-10-11 10:56:41 -0300241 enum vb2_buffer_state state;
242
243 struct list_head queued_entry;
244 struct list_head done_entry;
Hans Verkuilb5b45412014-01-29 11:53:25 -0300245#ifdef CONFIG_VIDEO_ADV_DEBUG
246 /*
247 * Counters for how often these buffer-related ops are
248 * called. Used to check for unbalanced ops.
249 */
250 u32 cnt_mem_alloc;
251 u32 cnt_mem_put;
252 u32 cnt_mem_get_dmabuf;
253 u32 cnt_mem_get_userptr;
254 u32 cnt_mem_put_userptr;
255 u32 cnt_mem_prepare;
256 u32 cnt_mem_finish;
257 u32 cnt_mem_attach_dmabuf;
258 u32 cnt_mem_detach_dmabuf;
259 u32 cnt_mem_map_dmabuf;
260 u32 cnt_mem_unmap_dmabuf;
261 u32 cnt_mem_vaddr;
262 u32 cnt_mem_cookie;
263 u32 cnt_mem_num_users;
264 u32 cnt_mem_mmap;
265
266 u32 cnt_buf_init;
267 u32 cnt_buf_prepare;
268 u32 cnt_buf_finish;
269 u32 cnt_buf_cleanup;
270 u32 cnt_buf_queue;
271
272 /* This counts the number of calls to vb2_buffer_done() */
273 u32 cnt_buf_done;
274#endif
Pawel Osciake23ccc02010-10-11 10:56:41 -0300275};
276
277/**
278 * struct vb2_ops - driver-specific callbacks
279 *
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300280 * @queue_setup: called from %VIDIOC_REQBUFS and %VIDIOC_CREATE_BUFS
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200281 * handlers before memory allocation. It can be called
282 * twice: if the original number of requested buffers
283 * could not be allocated, then it will be called a
284 * second time with the actually allocated number of
285 * buffers to verify if that is OK.
286 * The driver should return the required number of buffers
Mauro Carvalho Chehab89cb3dd2016-07-17 08:44:08 -0300287 * in \*num_buffers, the required number of planes per
288 * buffer in \*num_planes, the size of each plane should be
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300289 * set in the sizes\[\] array and optional per-plane
290 * allocator specific device in the alloc_devs\[\] array.
291 * When called from %VIDIOC_REQBUFS, \*num_planes == 0, the
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200292 * driver has to use the currently configured format to
Mauro Carvalho Chehab89cb3dd2016-07-17 08:44:08 -0300293 * determine the plane sizes and \*num_buffers is the total
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200294 * number of buffers that are being allocated. When called
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300295 * from %VIDIOC_CREATE_BUFS, \*num_planes != 0 and it
296 * describes the requested number of planes and sizes\[\]
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200297 * contains the requested plane sizes. If either
Mauro Carvalho Chehab89cb3dd2016-07-17 08:44:08 -0300298 * \*num_planes or the requested sizes are invalid callback
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300299 * must return %-EINVAL. In this case \*num_buffers are
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200300 * being allocated additionally to q->num_buffers.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300301 * @wait_prepare: release any locks taken while calling vb2 functions;
302 * it is called before an ioctl needs to wait for a new
303 * buffer to arrive; required to avoid a deadlock in
Hans Verkuil3f12e6b2014-02-28 12:25:28 -0300304 * blocking access type.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300305 * @wait_finish: reacquire all locks released in the previous callback;
306 * required to continue operation after sleeping while
Hans Verkuil3f12e6b2014-02-28 12:25:28 -0300307 * waiting for a new buffer to arrive.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300308 * @buf_init: called once after allocating a buffer (in MMAP case)
309 * or after acquiring a new USERPTR buffer; drivers may
310 * perform additional buffer-related initialization;
311 * initialization failure (return != 0) will prevent
Hans Verkuil3f12e6b2014-02-28 12:25:28 -0300312 * queue setup from completing successfully; optional.
Guennadi Liakhovetski2d864012011-09-28 09:23:02 -0300313 * @buf_prepare: called every time the buffer is queued from userspace
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300314 * and from the %VIDIOC_PREPARE_BUF ioctl; drivers may
Hans Verkuilcf227422014-11-18 09:50:57 -0300315 * perform any initialization required before each
316 * hardware operation in this callback; drivers can
317 * access/modify the buffer here as it is still synced for
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300318 * the CPU; drivers that support %VIDIOC_CREATE_BUFS must
Hans Verkuilcf227422014-11-18 09:50:57 -0300319 * also validate the buffer size; if an error is returned,
320 * the buffer will not be queued in driver; optional.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300321 * @buf_finish: called before every dequeue of the buffer back to
Hans Verkuilcf227422014-11-18 09:50:57 -0300322 * userspace; the buffer is synced for the CPU, so drivers
323 * can access/modify the buffer contents; drivers may
324 * perform any operations required before userspace
325 * accesses the buffer; optional. The buffer state can be
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300326 * one of the following: %DONE and %ERROR occur while
327 * streaming is in progress, and the %PREPARED state occurs
Hans Verkuilcf227422014-11-18 09:50:57 -0300328 * when the queue has been canceled and all pending
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300329 * buffers are being returned to their default %DEQUEUED
Hans Verkuilcf227422014-11-18 09:50:57 -0300330 * state. Typically you only have to do something if the
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300331 * state is %VB2_BUF_STATE_DONE, since in all other cases
Hans Verkuilcf227422014-11-18 09:50:57 -0300332 * the buffer contents will be ignored anyway.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300333 * @buf_cleanup: called once before the buffer is freed; drivers may
Hans Verkuil3f12e6b2014-02-28 12:25:28 -0300334 * perform any additional cleanup; optional.
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300335 * @start_streaming: called once to enter 'streaming' state; the driver may
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300336 * receive buffers with @buf_queue callback
337 * before @start_streaming is called; the driver gets the
338 * number of already queued buffers in count parameter;
339 * driver can return an error if hardware fails, in that
340 * case all buffers that have been already given by
341 * the @buf_queue callback are to be returned by the driver
342 * by calling @vb2_buffer_done\(%VB2_BUF_STATE_QUEUED\).
Hans Verkuilccf58cb2014-07-23 03:17:06 -0300343 * If you need a minimum number of buffers before you can
344 * start streaming, then set @min_buffers_needed in the
345 * vb2_queue structure. If that is non-zero then
346 * start_streaming won't be called until at least that
347 * many buffers have been queued up by userspace.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300348 * @stop_streaming: called when 'streaming' state must be disabled; driver
349 * should stop any DMA transactions or wait until they
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300350 * finish and give back all buffers it got from &buf_queue
351 * callback by calling @vb2_buffer_done\(\) with either
352 * %VB2_BUF_STATE_DONE or %VB2_BUF_STATE_ERROR; may use
Hans Verkuilccf58cb2014-07-23 03:17:06 -0300353 * vb2_wait_for_all_buffers() function
Pawel Osciake23ccc02010-10-11 10:56:41 -0300354 * @buf_queue: passes buffer vb to the driver; driver may start
355 * hardware operation on this buffer; driver should give
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300356 * the buffer back by calling vb2_buffer_done() function;
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300357 * it is allways called after calling %VIDIOC_STREAMON ioctl;
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300358 * might be called before start_streaming callback if user
Mauro Carvalho Chehab564aaf62016-07-23 07:12:03 -0300359 * pre-queued buffers before calling %VIDIOC_STREAMON.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300360 */
361struct vb2_ops {
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200362 int (*queue_setup)(struct vb2_queue *q,
Guennadi Liakhovetskifc714e702011-08-24 10:30:21 -0300363 unsigned int *num_buffers, unsigned int *num_planes,
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300364 unsigned int sizes[], struct device *alloc_devs[]);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300365
366 void (*wait_prepare)(struct vb2_queue *q);
367 void (*wait_finish)(struct vb2_queue *q);
368
369 int (*buf_init)(struct vb2_buffer *vb);
370 int (*buf_prepare)(struct vb2_buffer *vb);
Hans Verkuil06470642014-03-04 07:27:13 -0300371 void (*buf_finish)(struct vb2_buffer *vb);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300372 void (*buf_cleanup)(struct vb2_buffer *vb);
373
Marek Szyprowskibd323e22011-08-29 08:51:49 -0300374 int (*start_streaming)(struct vb2_queue *q, unsigned int count);
Hans Verkuile37559b2014-04-17 02:47:21 -0300375 void (*stop_streaming)(struct vb2_queue *q);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300376
377 void (*buf_queue)(struct vb2_buffer *vb);
378};
379
Hans Verkuil10cc3b12015-11-20 08:32:00 -0200380/**
381 * struct vb2_ops - driver-specific callbacks
382 *
Sakari Ailuse7e0c3e2016-04-03 16:15:00 -0300383 * @verify_planes_array: Verify that a given user space structure contains
384 * enough planes for the buffer. This is called
385 * for each dequeued buffer.
Hans Verkuil10cc3b12015-11-20 08:32:00 -0200386 * @fill_user_buffer: given a vb2_buffer fill in the userspace structure.
387 * For V4L2 this is a struct v4l2_buffer.
388 * @fill_vb2_buffer: given a userspace structure, fill in the vb2_buffer.
389 * If the userspace structure is invalid, then this op
390 * will return an error.
391 * @copy_timestamp: copy the timestamp from a userspace structure to
392 * the vb2_buffer struct.
393 */
Junghak Sungb0e0e1f2015-10-06 06:37:48 -0300394struct vb2_buf_ops {
Sakari Ailuse7e0c3e2016-04-03 16:15:00 -0300395 int (*verify_planes_array)(struct vb2_buffer *vb, const void *pb);
Hans Verkuil10cc3b12015-11-20 08:32:00 -0200396 void (*fill_user_buffer)(struct vb2_buffer *vb, void *pb);
Junghak Sungb0e0e1f2015-10-06 06:37:48 -0300397 int (*fill_vb2_buffer)(struct vb2_buffer *vb, const void *pb,
398 struct vb2_plane *planes);
Hans Verkuil10cc3b12015-11-20 08:32:00 -0200399 void (*copy_timestamp)(struct vb2_buffer *vb, const void *pb);
Junghak Sungb0e0e1f2015-10-06 06:37:48 -0300400};
Hans Verkuil5a5adf62012-06-22 07:29:35 -0300401
Pawel Osciake23ccc02010-10-11 10:56:41 -0300402/**
403 * struct vb2_queue - a videobuf queue
404 *
Junghak Sungbed04f92015-10-06 06:37:47 -0300405 * @type: private buffer type whose content is defined by the vb2-core
406 * caller. For example, for V4L2, it should match
407 * the V4L2_BUF_TYPE_* in include/uapi/linux/videodev2.h
Pawel Osciake23ccc02010-10-11 10:56:41 -0300408 * @io_modes: supported io methods (see vb2_io_modes enum)
Hans Verkuil20be7ab2015-12-16 08:30:43 -0200409 * @dev: device to use for the default allocation context if the driver
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300410 * doesn't fill in the @alloc_devs array.
Hans Verkuild16e8322016-04-15 09:15:05 -0300411 * @dma_attrs: DMA attributes to use for the DMA. May be NULL.
Kamil Debski06e7a9b62015-02-23 09:26:16 -0300412 * @fileio_read_once: report EOF after reading the first buffer
413 * @fileio_write_immediately: queue buffer after each write() call
Kamil Debskif61bf132015-02-23 09:26:17 -0300414 * @allow_zero_bytesused: allow bytesused == 0 to be passed to the driver
Ricardo Ribaldab9387682016-04-25 06:04:45 -0300415 * @quirk_poll_must_check_waiting_for_buffers: Return POLLERR at poll when QBUF
416 * has not been called. This is a vb1 idiom that has been adopted
417 * also by vb2.
Hans Verkuil5a5adf62012-06-22 07:29:35 -0300418 * @lock: pointer to a mutex that protects the vb2_queue struct. The
419 * driver can set this to a mutex to let the v4l2 core serialize
420 * the queuing ioctls. If the driver wants to handle locking
421 * itself, then this should be set to NULL. This lock is not used
422 * by the videobuf2 core API.
423 * @owner: The filehandle that 'owns' the buffers, i.e. the filehandle
424 * that called reqbufs, create_buffers or started fileio.
425 * This field is not used by the videobuf2 core API, but it allows
426 * drivers to easily associate an owner filehandle with the queue.
Pawel Osciake23ccc02010-10-11 10:56:41 -0300427 * @ops: driver-specific callbacks
428 * @mem_ops: memory allocator specific callbacks
Junghak Sungb0e0e1f2015-10-06 06:37:48 -0300429 * @buf_ops: callbacks to deliver buffer information
430 * between user-space and kernel-space
Pawel Osciake23ccc02010-10-11 10:56:41 -0300431 * @drv_priv: driver private data
432 * @buf_struct_size: size of the driver-specific buffer structure;
433 * "0" indicates the driver doesn't want to use a custom buffer
Junghak Sung2d700712015-09-22 10:30:30 -0300434 * structure type. for example, sizeof(struct vb2_v4l2_buffer)
435 * will be used for v4l2.
Laurent Pinchart072f1a42014-09-11 19:43:46 -0300436 * @timestamp_flags: Timestamp flags; V4L2_BUF_FLAG_TIMESTAMP_* and
437 * V4L2_BUF_FLAG_TSTAMP_SRC_*
Hans Verkuilb6ba2052013-03-01 15:44:20 -0300438 * @gfp_flags: additional gfp flags used when allocating the buffers.
439 * Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32
440 * to force the buffer allocation to a specific memory zone.
Hans Verkuilb3379c62014-02-24 13:51:03 -0300441 * @min_buffers_needed: the minimum number of buffers needed before
442 * start_streaming() can be called. Used when a DMA engine
443 * cannot be started unless at least this number of buffers
444 * have been queued into the driver.
Mauro Carvalho Chehabd78757e2015-08-22 08:57:02 -0300445 */
446/*
447 * Private elements (won't appear at the DocBook):
Hans Verkuilf035eb42014-08-07 03:47:14 -0300448 * @mmap_lock: private mutex used when buffers are allocated/freed/mmapped
Pawel Osciake23ccc02010-10-11 10:56:41 -0300449 * @memory: current memory type used
450 * @bufs: videobuf buffer structures
451 * @num_buffers: number of allocated/used buffers
452 * @queued_list: list of buffers currently queued from userspace
Hans Verkuilb3379c62014-02-24 13:51:03 -0300453 * @queued_count: number of buffers queued and ready for streaming.
Hans Verkuil6ea3b982014-02-06 05:46:11 -0300454 * @owned_by_drv_count: number of buffers owned by the driver
Pawel Osciake23ccc02010-10-11 10:56:41 -0300455 * @done_list: list of buffers ready to be dequeued to userspace
456 * @done_lock: lock to protect done_list list
457 * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300458 * @alloc_devs: memory type/allocator-specific per-plane device
Pawel Osciake23ccc02010-10-11 10:56:41 -0300459 * @streaming: current streaming state
Hans Verkuilb3379c62014-02-24 13:51:03 -0300460 * @start_streaming_called: start_streaming() was called successfully and we
461 * started streaming.
Laurent Pinchart4bb72672014-06-03 18:53:25 -0300462 * @error: a fatal error occurred on the queue
Hans Verkuil58d75f42014-09-20 16:16:35 -0300463 * @waiting_for_buffers: used in poll() to check if vb2 is still waiting for
464 * buffers. Only set for capture queues if qbuf has not yet been
465 * called since poll() needs to return POLLERR in that situation.
Junghak Sungbed04f92015-10-06 06:37:47 -0300466 * @is_multiplanar: set if buffer type is multiplanar
467 * @is_output: set if buffer type is output
Junghak Sung959c3ef2015-11-03 08:16:38 -0200468 * @copy_timestamp: set if vb2-core should set timestamps
Philipp Zabelc1621842015-05-04 07:51:06 -0300469 * @last_buffer_dequeued: used in poll() and DQBUF to immediately return if the
470 * last decoded buffer was already dequeued. Set for capture queues
471 * when a buffer with the V4L2_BUF_FLAG_LAST is dequeued.
Marek Szyprowskib25748f2010-12-06 05:56:55 -0300472 * @fileio: file io emulator internal data, used only if emulator is active
Hans Verkuil3415a892014-04-14 07:33:00 -0300473 * @threadio: thread io internal data, used only if thread is active
Pawel Osciake23ccc02010-10-11 10:56:41 -0300474 */
475struct vb2_queue {
Junghak Sungbed04f92015-10-06 06:37:47 -0300476 unsigned int type;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300477 unsigned int io_modes;
Hans Verkuil20be7ab2015-12-16 08:30:43 -0200478 struct device *dev;
Hans Verkuild16e8322016-04-15 09:15:05 -0300479 const struct dma_attrs *dma_attrs;
Kamil Debski06e7a9b62015-02-23 09:26:16 -0300480 unsigned fileio_read_once:1;
481 unsigned fileio_write_immediately:1;
Kamil Debskif61bf132015-02-23 09:26:17 -0300482 unsigned allow_zero_bytesused:1;
Ricardo Ribaldab9387682016-04-25 06:04:45 -0300483 unsigned quirk_poll_must_check_waiting_for_buffers:1;
Kamil Debski06e7a9b62015-02-23 09:26:16 -0300484
Hans Verkuil5a5adf62012-06-22 07:29:35 -0300485 struct mutex *lock;
Junghak Sungbed04f92015-10-06 06:37:47 -0300486 void *owner;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300487
488 const struct vb2_ops *ops;
489 const struct vb2_mem_ops *mem_ops;
Junghak Sungb0e0e1f2015-10-06 06:37:48 -0300490 const struct vb2_buf_ops *buf_ops;
491
Pawel Osciake23ccc02010-10-11 10:56:41 -0300492 void *drv_priv;
493 unsigned int buf_struct_size;
Sakari Ailusade48682014-02-25 19:12:19 -0300494 u32 timestamp_flags;
Hans Verkuilb6ba2052013-03-01 15:44:20 -0300495 gfp_t gfp_flags;
Hans Verkuilb3379c62014-02-24 13:51:03 -0300496 u32 min_buffers_needed;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300497
Mauro Carvalho Chehabd78757e2015-08-22 08:57:02 -0300498 /* private: internal use only */
Hans Verkuilf035eb42014-08-07 03:47:14 -0300499 struct mutex mmap_lock;
Junghak Sungbed04f92015-10-06 06:37:47 -0300500 unsigned int memory;
501 struct vb2_buffer *bufs[VB2_MAX_FRAME];
Pawel Osciake23ccc02010-10-11 10:56:41 -0300502 unsigned int num_buffers;
503
504 struct list_head queued_list;
Hans Verkuilb3379c62014-02-24 13:51:03 -0300505 unsigned int queued_count;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300506
Hans Verkuil6ea3b982014-02-06 05:46:11 -0300507 atomic_t owned_by_drv_count;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300508 struct list_head done_list;
509 spinlock_t done_lock;
510 wait_queue_head_t done_wq;
511
Hans Verkuil36c0f8b2016-04-15 09:15:05 -0300512 struct device *alloc_devs[VB2_MAX_PLANES];
Pawel Osciake23ccc02010-10-11 10:56:41 -0300513
514 unsigned int streaming:1;
Hans Verkuilb3379c62014-02-24 13:51:03 -0300515 unsigned int start_streaming_called:1;
Laurent Pinchart4bb72672014-06-03 18:53:25 -0300516 unsigned int error:1;
Hans Verkuil58d75f42014-09-20 16:16:35 -0300517 unsigned int waiting_for_buffers:1;
Junghak Sungbed04f92015-10-06 06:37:47 -0300518 unsigned int is_multiplanar:1;
519 unsigned int is_output:1;
Junghak Sung959c3ef2015-11-03 08:16:38 -0200520 unsigned int copy_timestamp:1;
Philipp Zabelc1621842015-05-04 07:51:06 -0300521 unsigned int last_buffer_dequeued:1;
Marek Szyprowskib25748f2010-12-06 05:56:55 -0300522
523 struct vb2_fileio_data *fileio;
Hans Verkuil3415a892014-04-14 07:33:00 -0300524 struct vb2_threadio_data *threadio;
Hans Verkuilb5b45412014-01-29 11:53:25 -0300525
526#ifdef CONFIG_VIDEO_ADV_DEBUG
527 /*
528 * Counters for how often these queue-related ops are
529 * called. Used to check for unbalanced ops.
530 */
531 u32 cnt_queue_setup;
532 u32 cnt_wait_prepare;
533 u32 cnt_wait_finish;
534 u32 cnt_start_streaming;
535 u32 cnt_stop_streaming;
536#endif
Pawel Osciake23ccc02010-10-11 10:56:41 -0300537};
538
539void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no);
540void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
541
542void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
Laurent Pinchart34ea4d42014-03-09 21:42:52 -0300543void vb2_discard_done(struct vb2_queue *q);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300544int vb2_wait_for_all_buffers(struct vb2_queue *q);
545
Hans Verkuil10cc3b12015-11-20 08:32:00 -0200546void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb);
Junghak Sung3c5be982015-10-06 06:37:49 -0300547int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
548 unsigned int *count);
549int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
Hans Verkuildf9ecb02015-10-28 00:50:37 -0200550 unsigned int *count, unsigned requested_planes,
551 const unsigned int requested_sizes[]);
Junghak Sung3c5be982015-10-06 06:37:49 -0300552int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb);
553int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb);
Hans Verkuilfac710e2016-01-27 10:08:42 -0200554int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
555 bool nonblocking);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300556
Junghak Sung3c5be982015-10-06 06:37:49 -0300557int vb2_core_streamon(struct vb2_queue *q, unsigned int type);
558int vb2_core_streamoff(struct vb2_queue *q, unsigned int type);
Guennadi Liakhovetski2d864012011-09-28 09:23:02 -0300559
Junghak Sung3c5be982015-10-06 06:37:49 -0300560int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type,
561 unsigned int index, unsigned int plane, unsigned int flags);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300562
Junghak Sung3c5be982015-10-06 06:37:49 -0300563int vb2_core_queue_init(struct vb2_queue *q);
564void vb2_core_queue_release(struct vb2_queue *q);
565
Laurent Pinchart4bb72672014-06-03 18:53:25 -0300566void vb2_queue_error(struct vb2_queue *q);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300567
Pawel Osciake23ccc02010-10-11 10:56:41 -0300568int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
Scott Jiang6f524ec2011-09-21 09:25:23 -0300569#ifndef CONFIG_MMU
570unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
571 unsigned long addr,
572 unsigned long len,
573 unsigned long pgoff,
574 unsigned long flags);
575#endif
Junghak Sungaf3bac12015-11-03 08:16:42 -0200576unsigned int vb2_core_poll(struct vb2_queue *q, struct file *file,
577 poll_table *wait);
578size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
579 loff_t *ppos, int nonblock);
580size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
581 loff_t *ppos, int nonblock);
582
583/*
584 * vb2_thread_fnc - callback function for use with vb2_thread
585 *
586 * This is called whenever a buffer is dequeued in the thread.
587 */
588typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv);
589
590/**
591 * vb2_thread_start() - start a thread for the given queue.
592 * @q: videobuf queue
593 * @fnc: callback function
594 * @priv: priv pointer passed to the callback function
595 * @thread_name:the name of the thread. This will be prefixed with "vb2-".
596 *
597 * This starts a thread that will queue and dequeue until an error occurs
598 * or @vb2_thread_stop is called.
599 *
600 * This function should not be used for anything else but the videobuf2-dvb
601 * support. If you think you have another good use-case for this, then please
602 * contact the linux-media mailinglist first.
603 */
604int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
605 const char *thread_name);
606
607/**
608 * vb2_thread_stop() - stop the thread for the given queue.
609 * @q: videobuf queue
610 */
611int vb2_thread_stop(struct vb2_queue *q);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300612
613/**
614 * vb2_is_streaming() - return streaming status of the queue
615 * @q: videobuf queue
616 */
617static inline bool vb2_is_streaming(struct vb2_queue *q)
618{
619 return q->streaming;
620}
621
622/**
Hans Verkuil74753cf2014-04-07 09:23:50 -0300623 * vb2_fileio_is_active() - return true if fileio is active.
624 * @q: videobuf queue
625 *
626 * This returns true if read() or write() is used to stream the data
627 * as opposed to stream I/O. This is almost never an important distinction,
628 * except in rare cases. One such case is that using read() or write() to
629 * stream a format using V4L2_FIELD_ALTERNATE is not allowed since there
630 * is no way you can pass the field information of each buffer to/from
631 * userspace. A driver that supports this field format should check for
632 * this in the queue_setup op and reject it if this function returns true.
633 */
634static inline bool vb2_fileio_is_active(struct vb2_queue *q)
635{
636 return q->fileio;
637}
638
639/**
Pawel Osciake23ccc02010-10-11 10:56:41 -0300640 * vb2_is_busy() - return busy status of the queue
641 * @q: videobuf queue
642 *
643 * This function checks if queue has any buffers allocated.
644 */
645static inline bool vb2_is_busy(struct vb2_queue *q)
646{
647 return (q->num_buffers > 0);
648}
649
650/**
651 * vb2_get_drv_priv() - return driver private data associated with the queue
652 * @q: videobuf queue
653 */
654static inline void *vb2_get_drv_priv(struct vb2_queue *q)
655{
656 return q->drv_priv;
657}
658
659/**
660 * vb2_set_plane_payload() - set bytesused for the plane plane_no
661 * @vb: buffer for which plane payload should be set
662 * @plane_no: plane number for which payload should be set
663 * @size: payload in bytes
664 */
665static inline void vb2_set_plane_payload(struct vb2_buffer *vb,
666 unsigned int plane_no, unsigned long size)
667{
668 if (plane_no < vb->num_planes)
Junghak Sung2d700712015-09-22 10:30:30 -0300669 vb->planes[plane_no].bytesused = size;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300670}
671
672/**
Laurent Pinchart9f00eda2011-02-27 14:38:19 -0300673 * vb2_get_plane_payload() - get bytesused for the plane plane_no
Pawel Osciake23ccc02010-10-11 10:56:41 -0300674 * @vb: buffer for which plane payload should be set
675 * @plane_no: plane number for which payload should be set
Pawel Osciake23ccc02010-10-11 10:56:41 -0300676 */
677static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb,
678 unsigned int plane_no)
679{
680 if (plane_no < vb->num_planes)
Junghak Sung2d700712015-09-22 10:30:30 -0300681 return vb->planes[plane_no].bytesused;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300682 return 0;
683}
684
685/**
686 * vb2_plane_size() - return plane size in bytes
687 * @vb: buffer for which plane size should be returned
688 * @plane_no: plane number for which size should be returned
689 */
690static inline unsigned long
691vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no)
692{
693 if (plane_no < vb->num_planes)
Junghak Sung2d700712015-09-22 10:30:30 -0300694 return vb->planes[plane_no].length;
Pawel Osciake23ccc02010-10-11 10:56:41 -0300695 return 0;
696}
697
Prabhakar Ladead13032014-09-06 12:26:49 -0300698/**
699 * vb2_start_streaming_called() - return streaming status of driver
700 * @q: videobuf queue
701 */
702static inline bool vb2_start_streaming_called(struct vb2_queue *q)
703{
704 return q->start_streaming_called;
705}
706
Philipp Zabelc1621842015-05-04 07:51:06 -0300707/**
708 * vb2_clear_last_buffer_dequeued() - clear last buffer dequeued flag of queue
709 * @q: videobuf queue
710 */
711static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q)
712{
713 q->last_buffer_dequeued = false;
714}
715
Junghak Sungaf3bac12015-11-03 08:16:42 -0200716/*
717 * The following functions are not part of the vb2 core API, but are useful
718 * functions for videobuf2-*.
719 */
720bool vb2_buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb);
721int vb2_verify_memory_type(struct vb2_queue *q,
722 enum vb2_memory memory, unsigned int type);
Pawel Osciake23ccc02010-10-11 10:56:41 -0300723#endif /* _MEDIA_VIDEOBUF2_CORE_H */