Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1 | /* |
| 2 | * videobuf2-core.c - V4L2 driver helper framework |
| 3 | * |
| 4 | * Copyright (C) 2010 Samsung Electronics |
| 5 | * |
Pawel Osciak | 9507208 | 2011-03-13 15:23:32 -0300 | [diff] [blame] | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 7 | * Marek Szyprowski <m.szyprowski@samsung.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/poll.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/sched.h> |
| 21 | |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 22 | #include <media/v4l2-dev.h> |
| 23 | #include <media/v4l2-fh.h> |
| 24 | #include <media/v4l2-event.h> |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 25 | #include <media/videobuf2-core.h> |
| 26 | |
| 27 | static int debug; |
| 28 | module_param(debug, int, 0644); |
| 29 | |
| 30 | #define dprintk(level, fmt, arg...) \ |
| 31 | do { \ |
| 32 | if (debug >= level) \ |
| 33 | printk(KERN_DEBUG "vb2: " fmt, ## arg); \ |
| 34 | } while (0) |
| 35 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 36 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 37 | |
| 38 | /* |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 39 | * If advanced debugging is on, then count how often each op is called |
| 40 | * successfully, which can either be per-buffer or per-queue. |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 41 | * |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 42 | * This makes it easy to check that the 'init' and 'cleanup' |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 43 | * (and variations thereof) stay balanced. |
| 44 | */ |
| 45 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 46 | #define log_memop(vb, op) \ |
| 47 | dprintk(2, "call_memop(%p, %d, %s)%s\n", \ |
| 48 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ |
| 49 | (vb)->vb2_queue->mem_ops->op ? "" : " (nop)") |
| 50 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 51 | #define call_memop(vb, op, args...) \ |
| 52 | ({ \ |
| 53 | struct vb2_queue *_q = (vb)->vb2_queue; \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 54 | int err; \ |
| 55 | \ |
| 56 | log_memop(vb, op); \ |
| 57 | err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \ |
| 58 | if (!err) \ |
| 59 | (vb)->cnt_mem_ ## op++; \ |
| 60 | err; \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 61 | }) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 62 | |
| 63 | #define call_ptr_memop(vb, op, args...) \ |
| 64 | ({ \ |
| 65 | struct vb2_queue *_q = (vb)->vb2_queue; \ |
| 66 | void *ptr; \ |
| 67 | \ |
| 68 | log_memop(vb, op); \ |
| 69 | ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \ |
| 70 | if (!IS_ERR_OR_NULL(ptr)) \ |
| 71 | (vb)->cnt_mem_ ## op++; \ |
| 72 | ptr; \ |
| 73 | }) |
| 74 | |
| 75 | #define call_void_memop(vb, op, args...) \ |
| 76 | ({ \ |
| 77 | struct vb2_queue *_q = (vb)->vb2_queue; \ |
| 78 | \ |
| 79 | log_memop(vb, op); \ |
| 80 | if (_q->mem_ops->op) \ |
| 81 | _q->mem_ops->op(args); \ |
| 82 | (vb)->cnt_mem_ ## op++; \ |
| 83 | }) |
| 84 | |
| 85 | #define log_qop(q, op) \ |
| 86 | dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \ |
| 87 | (q)->ops->op ? "" : " (nop)") |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 88 | |
| 89 | #define call_qop(q, op, args...) \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 90 | ({ \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 91 | int err; \ |
| 92 | \ |
| 93 | log_qop(q, op); \ |
| 94 | err = (q)->ops->op ? (q)->ops->op(args) : 0; \ |
| 95 | if (!err) \ |
| 96 | (q)->cnt_ ## op++; \ |
| 97 | err; \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 98 | }) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 99 | |
| 100 | #define call_void_qop(q, op, args...) \ |
| 101 | ({ \ |
| 102 | log_qop(q, op); \ |
| 103 | if ((q)->ops->op) \ |
| 104 | (q)->ops->op(args); \ |
| 105 | (q)->cnt_ ## op++; \ |
| 106 | }) |
| 107 | |
| 108 | #define log_vb_qop(vb, op, args...) \ |
| 109 | dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \ |
| 110 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ |
| 111 | (vb)->vb2_queue->ops->op ? "" : " (nop)") |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 112 | |
| 113 | #define call_vb_qop(vb, op, args...) \ |
| 114 | ({ \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 115 | int err; \ |
| 116 | \ |
| 117 | log_vb_qop(vb, op); \ |
| 118 | err = (vb)->vb2_queue->ops->op ? \ |
| 119 | (vb)->vb2_queue->ops->op(args) : 0; \ |
| 120 | if (!err) \ |
| 121 | (vb)->cnt_ ## op++; \ |
| 122 | err; \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 123 | }) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 124 | |
| 125 | #define call_void_vb_qop(vb, op, args...) \ |
| 126 | ({ \ |
| 127 | log_vb_qop(vb, op); \ |
| 128 | if ((vb)->vb2_queue->ops->op) \ |
| 129 | (vb)->vb2_queue->ops->op(args); \ |
| 130 | (vb)->cnt_ ## op++; \ |
| 131 | }) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 132 | |
| 133 | #else |
| 134 | |
| 135 | #define call_memop(vb, op, args...) \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 136 | ((vb)->vb2_queue->mem_ops->op ? \ |
| 137 | (vb)->vb2_queue->mem_ops->op(args) : 0) |
| 138 | |
| 139 | #define call_ptr_memop(vb, op, args...) \ |
| 140 | ((vb)->vb2_queue->mem_ops->op ? \ |
| 141 | (vb)->vb2_queue->mem_ops->op(args) : NULL) |
| 142 | |
| 143 | #define call_void_memop(vb, op, args...) \ |
| 144 | do { \ |
| 145 | if ((vb)->vb2_queue->mem_ops->op) \ |
| 146 | (vb)->vb2_queue->mem_ops->op(args); \ |
| 147 | } while (0) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 148 | |
| 149 | #define call_qop(q, op, args...) \ |
| 150 | ((q)->ops->op ? (q)->ops->op(args) : 0) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 151 | |
| 152 | #define call_void_qop(q, op, args...) \ |
| 153 | do { \ |
| 154 | if ((q)->ops->op) \ |
| 155 | (q)->ops->op(args); \ |
| 156 | } while (0) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 157 | |
| 158 | #define call_vb_qop(vb, op, args...) \ |
| 159 | ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 160 | |
| 161 | #define call_void_vb_qop(vb, op, args...) \ |
| 162 | do { \ |
| 163 | if ((vb)->vb2_queue->ops->op) \ |
| 164 | (vb)->vb2_queue->ops->op(args); \ |
| 165 | } while (0) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 166 | |
| 167 | #endif |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 168 | |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 169 | /* Flags that are set by the vb2 core */ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 170 | #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 171 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 172 | V4L2_BUF_FLAG_PREPARED | \ |
| 173 | V4L2_BUF_FLAG_TIMESTAMP_MASK) |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 174 | /* Output buffer flags that should be passed on to the driver */ |
| 175 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ |
| 176 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) |
Marek Szyprowski | ea42c8e | 2011-04-12 10:14:13 -0300 | [diff] [blame] | 177 | |
Hans Verkuil | fb64dca | 2014-02-28 12:49:18 -0300 | [diff] [blame] | 178 | static void __vb2_queue_cancel(struct vb2_queue *q); |
| 179 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 180 | /** |
| 181 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer |
| 182 | */ |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 183 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 184 | { |
| 185 | struct vb2_queue *q = vb->vb2_queue; |
| 186 | void *mem_priv; |
| 187 | int plane; |
| 188 | |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 189 | /* |
| 190 | * Allocate memory for all planes in this buffer |
| 191 | * NOTE: mmapped areas should be page aligned |
| 192 | */ |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 193 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 194 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
| 195 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 196 | mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane], |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 197 | size, q->gfp_flags); |
Guennadi Liakhovetski | 62a7943 | 2011-03-22 09:24:58 -0300 | [diff] [blame] | 198 | if (IS_ERR_OR_NULL(mem_priv)) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 199 | goto free; |
| 200 | |
| 201 | /* Associate allocator private data with this plane */ |
| 202 | vb->planes[plane].mem_priv = mem_priv; |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 203 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | return 0; |
| 207 | free: |
| 208 | /* Free already allocated memory if one of the allocations failed */ |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 209 | for (; plane > 0; --plane) { |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 210 | call_void_memop(vb, put, vb->planes[plane - 1].mem_priv); |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 211 | vb->planes[plane - 1].mem_priv = NULL; |
| 212 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 213 | |
| 214 | return -ENOMEM; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * __vb2_buf_mem_free() - free memory of the given buffer |
| 219 | */ |
| 220 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) |
| 221 | { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 222 | unsigned int plane; |
| 223 | |
| 224 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 225 | call_void_memop(vb, put, vb->planes[plane].mem_priv); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 226 | vb->planes[plane].mem_priv = NULL; |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 227 | dprintk(3, "Freed plane %d of buffer %d\n", plane, |
| 228 | vb->v4l2_buf.index); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 229 | } |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * __vb2_buf_userptr_put() - release userspace memory associated with |
| 234 | * a USERPTR buffer |
| 235 | */ |
| 236 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) |
| 237 | { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 238 | unsigned int plane; |
| 239 | |
| 240 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 241 | if (vb->planes[plane].mem_priv) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 242 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 243 | vb->planes[plane].mem_priv = NULL; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 244 | } |
| 245 | } |
| 246 | |
| 247 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 248 | * __vb2_plane_dmabuf_put() - release memory associated with |
| 249 | * a DMABUF shared plane |
| 250 | */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 251 | static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p) |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 252 | { |
| 253 | if (!p->mem_priv) |
| 254 | return; |
| 255 | |
| 256 | if (p->dbuf_mapped) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 257 | call_void_memop(vb, unmap_dmabuf, p->mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 258 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 259 | call_void_memop(vb, detach_dmabuf, p->mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 260 | dma_buf_put(p->dbuf); |
| 261 | memset(p, 0, sizeof(*p)); |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * __vb2_buf_dmabuf_put() - release memory associated with |
| 266 | * a DMABUF shared buffer |
| 267 | */ |
| 268 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) |
| 269 | { |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 270 | unsigned int plane; |
| 271 | |
| 272 | for (plane = 0; plane < vb->num_planes; ++plane) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 273 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | /** |
Hans Verkuil | a5e3d74 | 2013-12-04 15:14:05 +0100 | [diff] [blame] | 277 | * __setup_lengths() - setup initial lengths for every plane in |
| 278 | * every buffer on the queue |
| 279 | */ |
| 280 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) |
| 281 | { |
| 282 | unsigned int buffer, plane; |
| 283 | struct vb2_buffer *vb; |
| 284 | |
| 285 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { |
| 286 | vb = q->bufs[buffer]; |
| 287 | if (!vb) |
| 288 | continue; |
| 289 | |
| 290 | for (plane = 0; plane < vb->num_planes; ++plane) |
| 291 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 296 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in |
| 297 | * every buffer on the queue |
| 298 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 299 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 300 | { |
| 301 | unsigned int buffer, plane; |
| 302 | struct vb2_buffer *vb; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 303 | unsigned long off; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 304 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 305 | if (q->num_buffers) { |
| 306 | struct v4l2_plane *p; |
| 307 | vb = q->bufs[q->num_buffers - 1]; |
| 308 | p = &vb->v4l2_planes[vb->num_planes - 1]; |
| 309 | off = PAGE_ALIGN(p->m.mem_offset + p->length); |
| 310 | } else { |
| 311 | off = 0; |
| 312 | } |
| 313 | |
| 314 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 315 | vb = q->bufs[buffer]; |
| 316 | if (!vb) |
| 317 | continue; |
| 318 | |
| 319 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 320 | vb->v4l2_planes[plane].m.mem_offset = off; |
| 321 | |
| 322 | dprintk(3, "Buffer %d, plane %d offset 0x%08lx\n", |
| 323 | buffer, plane, off); |
| 324 | |
| 325 | off += vb->v4l2_planes[plane].length; |
| 326 | off = PAGE_ALIGN(off); |
| 327 | } |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) |
| 333 | * video buffer memory for all buffers/planes on the queue and initializes the |
| 334 | * queue |
| 335 | * |
| 336 | * Returns the number of buffers successfully allocated. |
| 337 | */ |
| 338 | static int __vb2_queue_alloc(struct vb2_queue *q, enum v4l2_memory memory, |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 339 | unsigned int num_buffers, unsigned int num_planes) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 340 | { |
| 341 | unsigned int buffer; |
| 342 | struct vb2_buffer *vb; |
| 343 | int ret; |
| 344 | |
| 345 | for (buffer = 0; buffer < num_buffers; ++buffer) { |
| 346 | /* Allocate videobuf buffer structures */ |
| 347 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); |
| 348 | if (!vb) { |
| 349 | dprintk(1, "Memory alloc for buffer struct failed\n"); |
| 350 | break; |
| 351 | } |
| 352 | |
| 353 | /* Length stores number of planes for multiplanar buffers */ |
| 354 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) |
| 355 | vb->v4l2_buf.length = num_planes; |
| 356 | |
| 357 | vb->state = VB2_BUF_STATE_DEQUEUED; |
| 358 | vb->vb2_queue = q; |
| 359 | vb->num_planes = num_planes; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 360 | vb->v4l2_buf.index = q->num_buffers + buffer; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 361 | vb->v4l2_buf.type = q->type; |
| 362 | vb->v4l2_buf.memory = memory; |
| 363 | |
| 364 | /* Allocate video buffer memory for the MMAP type */ |
| 365 | if (memory == V4L2_MEMORY_MMAP) { |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 366 | ret = __vb2_buf_mem_alloc(vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 367 | if (ret) { |
| 368 | dprintk(1, "Failed allocating memory for " |
| 369 | "buffer %d\n", buffer); |
| 370 | kfree(vb); |
| 371 | break; |
| 372 | } |
| 373 | /* |
| 374 | * Call the driver-provided buffer initialization |
| 375 | * callback, if given. An error in initialization |
| 376 | * results in queue setup failure. |
| 377 | */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 378 | ret = call_vb_qop(vb, buf_init, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 379 | if (ret) { |
| 380 | dprintk(1, "Buffer %d %p initialization" |
| 381 | " failed\n", buffer, vb); |
| 382 | __vb2_buf_mem_free(vb); |
| 383 | kfree(vb); |
| 384 | break; |
| 385 | } |
| 386 | } |
| 387 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 388 | q->bufs[q->num_buffers + buffer] = vb; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 389 | } |
| 390 | |
Hans Verkuil | a5e3d74 | 2013-12-04 15:14:05 +0100 | [diff] [blame] | 391 | __setup_lengths(q, buffer); |
Philipp Zabel | dc77523 | 2013-09-19 04:37:29 -0300 | [diff] [blame] | 392 | if (memory == V4L2_MEMORY_MMAP) |
| 393 | __setup_offsets(q, buffer); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 394 | |
| 395 | dprintk(1, "Allocated %d buffers, %d plane(s) each\n", |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 396 | buffer, num_planes); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 397 | |
| 398 | return buffer; |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * __vb2_free_mem() - release all video buffer memory for a given queue |
| 403 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 404 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 405 | { |
| 406 | unsigned int buffer; |
| 407 | struct vb2_buffer *vb; |
| 408 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 409 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 410 | ++buffer) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 411 | vb = q->bufs[buffer]; |
| 412 | if (!vb) |
| 413 | continue; |
| 414 | |
| 415 | /* Free MMAP buffers or release USERPTR buffers */ |
| 416 | if (q->memory == V4L2_MEMORY_MMAP) |
| 417 | __vb2_buf_mem_free(vb); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 418 | else if (q->memory == V4L2_MEMORY_DMABUF) |
| 419 | __vb2_buf_dmabuf_put(vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 420 | else |
| 421 | __vb2_buf_userptr_put(vb); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | /** |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 426 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
| 427 | * related information, if no buffers are left return the queue to an |
| 428 | * uninitialized state. Might be called even if the queue has already been freed. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 429 | */ |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 430 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 431 | { |
| 432 | unsigned int buffer; |
| 433 | |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 434 | /* |
| 435 | * Sanity check: when preparing a buffer the queue lock is released for |
| 436 | * a short while (see __buf_prepare for the details), which would allow |
| 437 | * a race with a reqbufs which can call this function. Removing the |
| 438 | * buffers from underneath __buf_prepare is obviously a bad idea, so we |
| 439 | * check if any of the buffers is in the state PREPARING, and if so we |
| 440 | * just return -EAGAIN. |
| 441 | */ |
| 442 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 443 | ++buffer) { |
| 444 | if (q->bufs[buffer] == NULL) |
| 445 | continue; |
| 446 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { |
| 447 | dprintk(1, "reqbufs: preparing buffers, cannot free\n"); |
| 448 | return -EAGAIN; |
| 449 | } |
| 450 | } |
| 451 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 452 | /* Call driver-provided cleanup function for each buffer, if provided */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 453 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 454 | ++buffer) { |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 455 | struct vb2_buffer *vb = q->bufs[buffer]; |
| 456 | |
| 457 | if (vb && vb->planes[0].mem_priv) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 458 | call_void_vb_qop(vb, buf_cleanup, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 459 | } |
| 460 | |
| 461 | /* Release video buffer memory */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 462 | __vb2_free_mem(q, buffers); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 463 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 464 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 465 | /* |
| 466 | * Check that all the calls were balances during the life-time of this |
| 467 | * queue. If not (or if the debug level is 1 or up), then dump the |
| 468 | * counters to the kernel log. |
| 469 | */ |
| 470 | if (q->num_buffers) { |
| 471 | bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming || |
| 472 | q->cnt_wait_prepare != q->cnt_wait_finish; |
| 473 | |
| 474 | if (unbalanced || debug) { |
| 475 | pr_info("vb2: counters for queue %p:%s\n", q, |
| 476 | unbalanced ? " UNBALANCED!" : ""); |
| 477 | pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", |
| 478 | q->cnt_queue_setup, q->cnt_start_streaming, |
| 479 | q->cnt_stop_streaming); |
| 480 | pr_info("vb2: wait_prepare: %u wait_finish: %u\n", |
| 481 | q->cnt_wait_prepare, q->cnt_wait_finish); |
| 482 | } |
| 483 | q->cnt_queue_setup = 0; |
| 484 | q->cnt_wait_prepare = 0; |
| 485 | q->cnt_wait_finish = 0; |
| 486 | q->cnt_start_streaming = 0; |
| 487 | q->cnt_stop_streaming = 0; |
| 488 | } |
| 489 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { |
| 490 | struct vb2_buffer *vb = q->bufs[buffer]; |
| 491 | bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || |
| 492 | vb->cnt_mem_prepare != vb->cnt_mem_finish || |
| 493 | vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || |
| 494 | vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || |
| 495 | vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || |
| 496 | vb->cnt_buf_queue != vb->cnt_buf_done || |
| 497 | vb->cnt_buf_prepare != vb->cnt_buf_finish || |
| 498 | vb->cnt_buf_init != vb->cnt_buf_cleanup; |
| 499 | |
| 500 | if (unbalanced || debug) { |
| 501 | pr_info("vb2: counters for queue %p, buffer %d:%s\n", |
| 502 | q, buffer, unbalanced ? " UNBALANCED!" : ""); |
| 503 | pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", |
| 504 | vb->cnt_buf_init, vb->cnt_buf_cleanup, |
| 505 | vb->cnt_buf_prepare, vb->cnt_buf_finish); |
| 506 | pr_info("vb2: buf_queue: %u buf_done: %u\n", |
| 507 | vb->cnt_buf_queue, vb->cnt_buf_done); |
| 508 | pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n", |
| 509 | vb->cnt_mem_alloc, vb->cnt_mem_put, |
| 510 | vb->cnt_mem_prepare, vb->cnt_mem_finish, |
| 511 | vb->cnt_mem_mmap); |
| 512 | pr_info("vb2: get_userptr: %u put_userptr: %u\n", |
| 513 | vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); |
| 514 | pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n", |
| 515 | vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf, |
| 516 | vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf); |
| 517 | pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n", |
| 518 | vb->cnt_mem_get_dmabuf, |
| 519 | vb->cnt_mem_num_users, |
| 520 | vb->cnt_mem_vaddr, |
| 521 | vb->cnt_mem_cookie); |
| 522 | } |
| 523 | } |
| 524 | #endif |
| 525 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 526 | /* Free videobuf buffers */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 527 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 528 | ++buffer) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 529 | kfree(q->bufs[buffer]); |
| 530 | q->bufs[buffer] = NULL; |
| 531 | } |
| 532 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 533 | q->num_buffers -= buffers; |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 534 | if (!q->num_buffers) { |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 535 | q->memory = 0; |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 536 | INIT_LIST_HEAD(&q->queued_list); |
| 537 | } |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 538 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | /** |
| 542 | * __verify_planes_array() - verify that the planes array passed in struct |
| 543 | * v4l2_buffer from userspace can be safely used |
| 544 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 545 | static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 546 | { |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 547 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
| 548 | return 0; |
| 549 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 550 | /* Is memory for copying plane information present? */ |
| 551 | if (NULL == b->m.planes) { |
| 552 | dprintk(1, "Multi-planar buffer passed but " |
| 553 | "planes array not provided\n"); |
| 554 | return -EINVAL; |
| 555 | } |
| 556 | |
| 557 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { |
| 558 | dprintk(1, "Incorrect planes array length, " |
| 559 | "expected %d, got %d\n", vb->num_planes, b->length); |
| 560 | return -EINVAL; |
| 561 | } |
| 562 | |
| 563 | return 0; |
| 564 | } |
| 565 | |
| 566 | /** |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 567 | * __verify_length() - Verify that the bytesused value for each plane fits in |
| 568 | * the plane length and that the data offset doesn't exceed the bytesused value. |
| 569 | */ |
| 570 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 571 | { |
| 572 | unsigned int length; |
| 573 | unsigned int plane; |
| 574 | |
| 575 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) |
| 576 | return 0; |
| 577 | |
| 578 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
| 579 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 580 | length = (b->memory == V4L2_MEMORY_USERPTR) |
| 581 | ? b->m.planes[plane].length |
| 582 | : vb->v4l2_planes[plane].length; |
| 583 | |
| 584 | if (b->m.planes[plane].bytesused > length) |
| 585 | return -EINVAL; |
Sylwester Nawrocki | 3c5c23c | 2013-08-26 11:47:09 -0300 | [diff] [blame] | 586 | |
| 587 | if (b->m.planes[plane].data_offset > 0 && |
| 588 | b->m.planes[plane].data_offset >= |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 589 | b->m.planes[plane].bytesused) |
| 590 | return -EINVAL; |
| 591 | } |
| 592 | } else { |
| 593 | length = (b->memory == V4L2_MEMORY_USERPTR) |
| 594 | ? b->length : vb->v4l2_planes[0].length; |
| 595 | |
| 596 | if (b->bytesused > length) |
| 597 | return -EINVAL; |
| 598 | } |
| 599 | |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | /** |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 604 | * __buffer_in_use() - return true if the buffer is in use and |
| 605 | * the queue cannot be freed (by the means of REQBUFS(0)) call |
| 606 | */ |
| 607 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) |
| 608 | { |
| 609 | unsigned int plane; |
| 610 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Marek Szyprowski | 2c2dd6ac | 2011-10-12 13:09:53 -0300 | [diff] [blame] | 611 | void *mem_priv = vb->planes[plane].mem_priv; |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 612 | /* |
| 613 | * If num_users() has not been provided, call_memop |
| 614 | * will return 0, apparently nobody cares about this |
| 615 | * case anyway. If num_users() returns more than 1, |
| 616 | * we are not the only user of the plane's memory. |
| 617 | */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 618 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 619 | return true; |
| 620 | } |
| 621 | return false; |
| 622 | } |
| 623 | |
| 624 | /** |
| 625 | * __buffers_in_use() - return true if any buffers on the queue are in use and |
| 626 | * the queue cannot be freed (by the means of REQBUFS(0)) call |
| 627 | */ |
| 628 | static bool __buffers_in_use(struct vb2_queue *q) |
| 629 | { |
| 630 | unsigned int buffer; |
| 631 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { |
| 632 | if (__buffer_in_use(q, q->bufs[buffer])) |
| 633 | return true; |
| 634 | } |
| 635 | return false; |
| 636 | } |
| 637 | |
| 638 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 639 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be |
| 640 | * returned to userspace |
| 641 | */ |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 642 | static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 643 | { |
| 644 | struct vb2_queue *q = vb->vb2_queue; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 645 | |
Sakari Ailus | 2b719d7 | 2012-05-02 09:40:03 -0300 | [diff] [blame] | 646 | /* Copy back data such as timestamp, flags, etc. */ |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 647 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
Sakari Ailus | 2b719d7 | 2012-05-02 09:40:03 -0300 | [diff] [blame] | 648 | b->reserved2 = vb->v4l2_buf.reserved2; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 649 | b->reserved = vb->v4l2_buf.reserved; |
| 650 | |
| 651 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 652 | /* |
| 653 | * Fill in plane-related data if userspace provided an array |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 654 | * for it. The caller has already verified memory and size. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 655 | */ |
Hans Verkuil | 3c0b606 | 2012-09-28 06:24:18 -0300 | [diff] [blame] | 656 | b->length = vb->num_planes; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 657 | memcpy(b->m.planes, vb->v4l2_planes, |
| 658 | b->length * sizeof(struct v4l2_plane)); |
| 659 | } else { |
| 660 | /* |
| 661 | * We use length and offset in v4l2_planes array even for |
| 662 | * single-planar buffers, but userspace does not. |
| 663 | */ |
| 664 | b->length = vb->v4l2_planes[0].length; |
| 665 | b->bytesused = vb->v4l2_planes[0].bytesused; |
| 666 | if (q->memory == V4L2_MEMORY_MMAP) |
| 667 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; |
| 668 | else if (q->memory == V4L2_MEMORY_USERPTR) |
| 669 | b->m.userptr = vb->v4l2_planes[0].m.userptr; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 670 | else if (q->memory == V4L2_MEMORY_DMABUF) |
| 671 | b->m.fd = vb->v4l2_planes[0].m.fd; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 672 | } |
| 673 | |
Marek Szyprowski | ea42c8e | 2011-04-12 10:14:13 -0300 | [diff] [blame] | 674 | /* |
| 675 | * Clear any buffer state related flags. |
| 676 | */ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 677 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
Sakari Ailus | 7ce6fd8 | 2014-02-25 19:08:52 -0300 | [diff] [blame] | 678 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
| 679 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
| 680 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { |
| 681 | /* |
| 682 | * For non-COPY timestamps, drop timestamp source bits |
| 683 | * and obtain the timestamp source from the queue. |
| 684 | */ |
| 685 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 686 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 687 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 688 | |
| 689 | switch (vb->state) { |
| 690 | case VB2_BUF_STATE_QUEUED: |
| 691 | case VB2_BUF_STATE_ACTIVE: |
| 692 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
| 693 | break; |
| 694 | case VB2_BUF_STATE_ERROR: |
| 695 | b->flags |= V4L2_BUF_FLAG_ERROR; |
| 696 | /* fall through */ |
| 697 | case VB2_BUF_STATE_DONE: |
| 698 | b->flags |= V4L2_BUF_FLAG_DONE; |
| 699 | break; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 700 | case VB2_BUF_STATE_PREPARED: |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 701 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
| 702 | break; |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 703 | case VB2_BUF_STATE_PREPARING: |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 704 | case VB2_BUF_STATE_DEQUEUED: |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 705 | /* nothing */ |
| 706 | break; |
| 707 | } |
| 708 | |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 709 | if (__buffer_in_use(q, vb)) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 710 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | /** |
| 714 | * vb2_querybuf() - query video buffer information |
| 715 | * @q: videobuf queue |
| 716 | * @b: buffer struct passed from userspace to vidioc_querybuf handler |
| 717 | * in driver |
| 718 | * |
| 719 | * Should be called from vidioc_querybuf ioctl handler in driver. |
| 720 | * This function will verify the passed v4l2_buffer structure and fill the |
| 721 | * relevant information for the userspace. |
| 722 | * |
| 723 | * The return values from this function are intended to be directly returned |
| 724 | * from vidioc_querybuf handler in driver. |
| 725 | */ |
| 726 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 727 | { |
| 728 | struct vb2_buffer *vb; |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 729 | int ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 730 | |
| 731 | if (b->type != q->type) { |
| 732 | dprintk(1, "querybuf: wrong buffer type\n"); |
| 733 | return -EINVAL; |
| 734 | } |
| 735 | |
| 736 | if (b->index >= q->num_buffers) { |
| 737 | dprintk(1, "querybuf: buffer index out of range\n"); |
| 738 | return -EINVAL; |
| 739 | } |
| 740 | vb = q->bufs[b->index]; |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 741 | ret = __verify_planes_array(vb, b); |
| 742 | if (!ret) |
| 743 | __fill_v4l2_buffer(vb, b); |
| 744 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 745 | } |
| 746 | EXPORT_SYMBOL(vb2_querybuf); |
| 747 | |
| 748 | /** |
| 749 | * __verify_userptr_ops() - verify that all memory operations required for |
| 750 | * USERPTR queue type have been provided |
| 751 | */ |
| 752 | static int __verify_userptr_ops(struct vb2_queue *q) |
| 753 | { |
| 754 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || |
| 755 | !q->mem_ops->put_userptr) |
| 756 | return -EINVAL; |
| 757 | |
| 758 | return 0; |
| 759 | } |
| 760 | |
| 761 | /** |
| 762 | * __verify_mmap_ops() - verify that all memory operations required for |
| 763 | * MMAP queue type have been provided |
| 764 | */ |
| 765 | static int __verify_mmap_ops(struct vb2_queue *q) |
| 766 | { |
| 767 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || |
| 768 | !q->mem_ops->put || !q->mem_ops->mmap) |
| 769 | return -EINVAL; |
| 770 | |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 775 | * __verify_dmabuf_ops() - verify that all memory operations required for |
| 776 | * DMABUF queue type have been provided |
| 777 | */ |
| 778 | static int __verify_dmabuf_ops(struct vb2_queue *q) |
| 779 | { |
| 780 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || |
| 781 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || |
| 782 | !q->mem_ops->unmap_dmabuf) |
| 783 | return -EINVAL; |
| 784 | |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | /** |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 789 | * __verify_memory_type() - Check whether the memory type and buffer type |
| 790 | * passed to a buffer operation are compatible with the queue. |
| 791 | */ |
| 792 | static int __verify_memory_type(struct vb2_queue *q, |
| 793 | enum v4l2_memory memory, enum v4l2_buf_type type) |
| 794 | { |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 795 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
| 796 | memory != V4L2_MEMORY_DMABUF) { |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 797 | dprintk(1, "reqbufs: unsupported memory type\n"); |
| 798 | return -EINVAL; |
| 799 | } |
| 800 | |
| 801 | if (type != q->type) { |
| 802 | dprintk(1, "reqbufs: requested type is incorrect\n"); |
| 803 | return -EINVAL; |
| 804 | } |
| 805 | |
| 806 | /* |
| 807 | * Make sure all the required memory ops for given memory type |
| 808 | * are available. |
| 809 | */ |
| 810 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { |
| 811 | dprintk(1, "reqbufs: MMAP for current setup unsupported\n"); |
| 812 | return -EINVAL; |
| 813 | } |
| 814 | |
| 815 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { |
| 816 | dprintk(1, "reqbufs: USERPTR for current setup unsupported\n"); |
| 817 | return -EINVAL; |
| 818 | } |
| 819 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 820 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
| 821 | dprintk(1, "reqbufs: DMABUF for current setup unsupported\n"); |
| 822 | return -EINVAL; |
| 823 | } |
| 824 | |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 825 | /* |
| 826 | * Place the busy tests at the end: -EBUSY can be ignored when |
| 827 | * create_bufs is called with count == 0, but count == 0 should still |
| 828 | * do the memory and type validation. |
| 829 | */ |
| 830 | if (q->fileio) { |
| 831 | dprintk(1, "reqbufs: file io in progress\n"); |
| 832 | return -EBUSY; |
| 833 | } |
| 834 | return 0; |
| 835 | } |
| 836 | |
| 837 | /** |
| 838 | * __reqbufs() - Initiate streaming |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 839 | * @q: videobuf2 queue |
| 840 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver |
| 841 | * |
| 842 | * Should be called from vidioc_reqbufs ioctl handler of a driver. |
| 843 | * This function: |
| 844 | * 1) verifies streaming parameters passed from the userspace, |
| 845 | * 2) sets up the queue, |
| 846 | * 3) negotiates number of buffers and planes per buffer with the driver |
| 847 | * to be used during streaming, |
| 848 | * 4) allocates internal buffer structures (struct vb2_buffer), according to |
| 849 | * the agreed parameters, |
| 850 | * 5) for MMAP memory type, allocates actual video memory, using the |
| 851 | * memory handling/allocation routines provided during queue initialization |
| 852 | * |
| 853 | * If req->count is 0, all the memory will be freed instead. |
| 854 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call |
| 855 | * and the queue is not busy, memory will be reallocated. |
| 856 | * |
| 857 | * The return values from this function are intended to be directly returned |
| 858 | * from vidioc_reqbufs handler in driver. |
| 859 | */ |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 860 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 861 | { |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 862 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 863 | int ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 864 | |
| 865 | if (q->streaming) { |
| 866 | dprintk(1, "reqbufs: streaming active\n"); |
| 867 | return -EBUSY; |
| 868 | } |
| 869 | |
Marek Szyprowski | 29e3fbd | 2011-03-09 14:03:24 -0300 | [diff] [blame] | 870 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 871 | /* |
| 872 | * We already have buffers allocated, so first check if they |
| 873 | * are not in use and can be freed. |
| 874 | */ |
| 875 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { |
| 876 | dprintk(1, "reqbufs: memory in use, cannot free\n"); |
| 877 | return -EBUSY; |
| 878 | } |
| 879 | |
Hans Verkuil | fb64dca | 2014-02-28 12:49:18 -0300 | [diff] [blame] | 880 | /* |
| 881 | * Call queue_cancel to clean up any buffers in the PREPARED or |
| 882 | * QUEUED state which is possible if buffers were prepared or |
| 883 | * queued without ever calling STREAMON. |
| 884 | */ |
| 885 | __vb2_queue_cancel(q); |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 886 | ret = __vb2_queue_free(q, q->num_buffers); |
| 887 | if (ret) |
| 888 | return ret; |
Marek Szyprowski | 29e3fbd | 2011-03-09 14:03:24 -0300 | [diff] [blame] | 889 | |
| 890 | /* |
| 891 | * In case of REQBUFS(0) return immediately without calling |
| 892 | * driver's queue_setup() callback and allocating resources. |
| 893 | */ |
| 894 | if (req->count == 0) |
| 895 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | /* |
| 899 | * Make sure the requested values and current defaults are sane. |
| 900 | */ |
| 901 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 902 | num_buffers = max_t(unsigned int, req->count, q->min_buffers_needed); |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 903 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 904 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
Marek Szyprowski | 13b1409 | 2011-04-14 07:17:44 -0300 | [diff] [blame] | 905 | q->memory = req->memory; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 906 | |
| 907 | /* |
| 908 | * Ask the driver how many buffers and planes per buffer it requires. |
| 909 | * Driver also sets the size and allocator context for each plane. |
| 910 | */ |
Guennadi Liakhovetski | fc714e7 | 2011-08-24 10:30:21 -0300 | [diff] [blame] | 911 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 912 | q->plane_sizes, q->alloc_ctx); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 913 | if (ret) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 914 | return ret; |
| 915 | |
| 916 | /* Finally, allocate buffers and video memory */ |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 917 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
| 918 | if (allocated_buffers == 0) { |
Marek Szyprowski | 66072d4 | 2011-06-28 08:29:02 -0300 | [diff] [blame] | 919 | dprintk(1, "Memory allocation failed\n"); |
| 920 | return -ENOMEM; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 921 | } |
| 922 | |
| 923 | /* |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 924 | * There is no point in continuing if we can't allocate the minimum |
| 925 | * number of buffers needed by this vb2_queue. |
| 926 | */ |
| 927 | if (allocated_buffers < q->min_buffers_needed) |
| 928 | ret = -ENOMEM; |
| 929 | |
| 930 | /* |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 931 | * Check if driver can handle the allocated number of buffers. |
| 932 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 933 | if (!ret && allocated_buffers < num_buffers) { |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 934 | num_buffers = allocated_buffers; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 935 | |
Guennadi Liakhovetski | fc714e7 | 2011-08-24 10:30:21 -0300 | [diff] [blame] | 936 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
| 937 | &num_planes, q->plane_sizes, q->alloc_ctx); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 938 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 939 | if (!ret && allocated_buffers < num_buffers) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 940 | ret = -ENOMEM; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 941 | |
| 942 | /* |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 943 | * Either the driver has accepted a smaller number of buffers, |
| 944 | * or .queue_setup() returned an error |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 945 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 946 | } |
| 947 | |
| 948 | q->num_buffers = allocated_buffers; |
| 949 | |
| 950 | if (ret < 0) { |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 951 | /* |
| 952 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' |
| 953 | * from q->num_buffers. |
| 954 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 955 | __vb2_queue_free(q, allocated_buffers); |
| 956 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 957 | } |
| 958 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 959 | /* |
| 960 | * Return the number of successfully allocated buffers |
| 961 | * to the userspace. |
| 962 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 963 | req->count = allocated_buffers; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 964 | |
| 965 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 966 | } |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 967 | |
| 968 | /** |
| 969 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and |
| 970 | * type values. |
| 971 | * @q: videobuf2 queue |
| 972 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver |
| 973 | */ |
| 974 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
| 975 | { |
| 976 | int ret = __verify_memory_type(q, req->memory, req->type); |
| 977 | |
| 978 | return ret ? ret : __reqbufs(q, req); |
| 979 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 980 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
| 981 | |
| 982 | /** |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 983 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 984 | * @q: videobuf2 queue |
| 985 | * @create: creation parameters, passed from userspace to vidioc_create_bufs |
| 986 | * handler in driver |
| 987 | * |
| 988 | * Should be called from vidioc_create_bufs ioctl handler of a driver. |
| 989 | * This function: |
| 990 | * 1) verifies parameter sanity |
| 991 | * 2) calls the .queue_setup() queue operation |
| 992 | * 3) performs any necessary memory allocations |
| 993 | * |
| 994 | * The return values from this function are intended to be directly returned |
| 995 | * from vidioc_create_bufs handler in driver. |
| 996 | */ |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 997 | static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 998 | { |
| 999 | unsigned int num_planes = 0, num_buffers, allocated_buffers; |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1000 | int ret; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1001 | |
| 1002 | if (q->num_buffers == VIDEO_MAX_FRAME) { |
| 1003 | dprintk(1, "%s(): maximum number of buffers already allocated\n", |
| 1004 | __func__); |
| 1005 | return -ENOBUFS; |
| 1006 | } |
| 1007 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1008 | if (!q->num_buffers) { |
| 1009 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
| 1010 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
| 1011 | q->memory = create->memory; |
| 1012 | } |
| 1013 | |
| 1014 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); |
| 1015 | |
| 1016 | /* |
| 1017 | * Ask the driver, whether the requested number of buffers, planes per |
| 1018 | * buffer and their sizes are acceptable |
| 1019 | */ |
| 1020 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, |
| 1021 | &num_planes, q->plane_sizes, q->alloc_ctx); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1022 | if (ret) |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1023 | return ret; |
| 1024 | |
| 1025 | /* Finally, allocate buffers and video memory */ |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1026 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1027 | num_planes); |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1028 | if (allocated_buffers == 0) { |
Hans Verkuil | f05393d2 | 2012-06-22 05:44:14 -0300 | [diff] [blame] | 1029 | dprintk(1, "Memory allocation failed\n"); |
| 1030 | return -ENOMEM; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1031 | } |
| 1032 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1033 | /* |
| 1034 | * Check if driver can handle the so far allocated number of buffers. |
| 1035 | */ |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1036 | if (allocated_buffers < num_buffers) { |
| 1037 | num_buffers = allocated_buffers; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1038 | |
| 1039 | /* |
| 1040 | * q->num_buffers contains the total number of buffers, that the |
| 1041 | * queue driver has set up |
| 1042 | */ |
| 1043 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, |
| 1044 | &num_planes, q->plane_sizes, q->alloc_ctx); |
| 1045 | |
| 1046 | if (!ret && allocated_buffers < num_buffers) |
| 1047 | ret = -ENOMEM; |
| 1048 | |
| 1049 | /* |
| 1050 | * Either the driver has accepted a smaller number of buffers, |
| 1051 | * or .queue_setup() returned an error |
| 1052 | */ |
| 1053 | } |
| 1054 | |
| 1055 | q->num_buffers += allocated_buffers; |
| 1056 | |
| 1057 | if (ret < 0) { |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1058 | /* |
| 1059 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' |
| 1060 | * from q->num_buffers. |
| 1061 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1062 | __vb2_queue_free(q, allocated_buffers); |
Hans Verkuil | f05393d2 | 2012-06-22 05:44:14 -0300 | [diff] [blame] | 1063 | return -ENOMEM; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1064 | } |
| 1065 | |
| 1066 | /* |
| 1067 | * Return the number of successfully allocated buffers |
| 1068 | * to the userspace. |
| 1069 | */ |
| 1070 | create->count = allocated_buffers; |
| 1071 | |
| 1072 | return 0; |
| 1073 | } |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1074 | |
| 1075 | /** |
Nicolas THERY | 53aa3b1 | 2012-07-20 09:25:37 -0300 | [diff] [blame] | 1076 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
| 1077 | * memory and type values. |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1078 | * @q: videobuf2 queue |
| 1079 | * @create: creation parameters, passed from userspace to vidioc_create_bufs |
| 1080 | * handler in driver |
| 1081 | */ |
| 1082 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
| 1083 | { |
| 1084 | int ret = __verify_memory_type(q, create->memory, create->format.type); |
| 1085 | |
| 1086 | create->index = q->num_buffers; |
Hans Verkuil | f05393d2 | 2012-06-22 05:44:14 -0300 | [diff] [blame] | 1087 | if (create->count == 0) |
| 1088 | return ret != -EBUSY ? ret : 0; |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1089 | return ret ? ret : __create_bufs(q, create); |
| 1090 | } |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1091 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
| 1092 | |
| 1093 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1094 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane |
| 1095 | * @vb: vb2_buffer to which the plane in question belongs to |
| 1096 | * @plane_no: plane number for which the address is to be returned |
| 1097 | * |
| 1098 | * This function returns a kernel virtual address of a given plane if |
| 1099 | * such a mapping exist, NULL otherwise. |
| 1100 | */ |
| 1101 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) |
| 1102 | { |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1103 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1104 | return NULL; |
| 1105 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1106 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1107 | |
| 1108 | } |
| 1109 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); |
| 1110 | |
| 1111 | /** |
| 1112 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane |
| 1113 | * @vb: vb2_buffer to which the plane in question belongs to |
| 1114 | * @plane_no: plane number for which the cookie is to be returned |
| 1115 | * |
| 1116 | * This function returns an allocator specific cookie for a given plane if |
| 1117 | * available, NULL otherwise. The allocator should provide some simple static |
| 1118 | * inline function, which would convert this cookie to the allocator specific |
| 1119 | * type that can be used directly by the driver to access the buffer. This can |
| 1120 | * be for example physical address, pointer to scatter list or IOMMU mapping. |
| 1121 | */ |
| 1122 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) |
| 1123 | { |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1124 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1125 | return NULL; |
| 1126 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1127 | return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1128 | } |
| 1129 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); |
| 1130 | |
| 1131 | /** |
| 1132 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished |
| 1133 | * @vb: vb2_buffer returned from the driver |
| 1134 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1135 | * or VB2_BUF_STATE_ERROR if the operation finished with an error. |
| 1136 | * If start_streaming fails then it should return buffers with state |
| 1137 | * VB2_BUF_STATE_QUEUED to put them back into the queue. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1138 | * |
| 1139 | * This function should be called by the driver after a hardware operation on |
| 1140 | * a buffer is finished and the buffer may be returned to userspace. The driver |
| 1141 | * cannot use this buffer anymore until it is queued back to it by videobuf |
| 1142 | * by the means of buf_queue callback. Only buffers previously queued to the |
| 1143 | * driver by buf_queue can be passed to this function. |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1144 | * |
| 1145 | * While streaming a buffer can only be returned in state DONE or ERROR. |
| 1146 | * The start_streaming op can also return them in case the DMA engine cannot |
| 1147 | * be started for some reason. In that case the buffers should be returned with |
| 1148 | * state QUEUED. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1149 | */ |
| 1150 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) |
| 1151 | { |
| 1152 | struct vb2_queue *q = vb->vb2_queue; |
| 1153 | unsigned long flags; |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1154 | unsigned int plane; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1155 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1156 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1157 | return; |
| 1158 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1159 | if (!q->start_streaming_called) { |
| 1160 | if (WARN_ON(state != VB2_BUF_STATE_QUEUED)) |
| 1161 | state = VB2_BUF_STATE_QUEUED; |
| 1162 | } else if (!WARN_ON(!q->start_streaming_called)) { |
| 1163 | if (WARN_ON(state != VB2_BUF_STATE_DONE && |
| 1164 | state != VB2_BUF_STATE_ERROR)) |
| 1165 | state = VB2_BUF_STATE_ERROR; |
| 1166 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1167 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 1168 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 1169 | /* |
| 1170 | * Although this is not a callback, it still does have to balance |
| 1171 | * with the buf_queue op. So update this counter manually. |
| 1172 | */ |
| 1173 | vb->cnt_buf_done++; |
| 1174 | #endif |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1175 | dprintk(4, "Done processing on buffer %d, state: %d\n", |
Tushar Behera | 9b6f5dc | 2012-11-12 04:01:29 -0300 | [diff] [blame] | 1176 | vb->v4l2_buf.index, state); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1177 | |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1178 | /* sync buffers */ |
| 1179 | for (plane = 0; plane < vb->num_planes; ++plane) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1180 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1181 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1182 | /* Add the buffer to the done buffers list */ |
| 1183 | spin_lock_irqsave(&q->done_lock, flags); |
| 1184 | vb->state = state; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1185 | if (state != VB2_BUF_STATE_QUEUED) |
| 1186 | list_add_tail(&vb->done_entry, &q->done_list); |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 1187 | atomic_dec(&q->owned_by_drv_count); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1188 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 1189 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1190 | if (state == VB2_BUF_STATE_QUEUED) |
| 1191 | return; |
| 1192 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1193 | /* Inform any processes that may be waiting for buffers */ |
| 1194 | wake_up(&q->done_wq); |
| 1195 | } |
| 1196 | EXPORT_SYMBOL_GPL(vb2_buffer_done); |
| 1197 | |
| 1198 | /** |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1199 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
| 1200 | * v4l2_buffer by the userspace. The caller has already verified that struct |
| 1201 | * v4l2_buffer has a valid number of planes. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1202 | */ |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1203 | static void __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1204 | struct v4l2_plane *v4l2_planes) |
| 1205 | { |
| 1206 | unsigned int plane; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1207 | |
| 1208 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1209 | /* Fill in driver-provided information for OUTPUT types */ |
| 1210 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 1211 | /* |
| 1212 | * Will have to go up to b->length when API starts |
| 1213 | * accepting variable number of planes. |
| 1214 | */ |
| 1215 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1216 | v4l2_planes[plane].bytesused = |
| 1217 | b->m.planes[plane].bytesused; |
| 1218 | v4l2_planes[plane].data_offset = |
| 1219 | b->m.planes[plane].data_offset; |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | if (b->memory == V4L2_MEMORY_USERPTR) { |
| 1224 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1225 | v4l2_planes[plane].m.userptr = |
| 1226 | b->m.planes[plane].m.userptr; |
| 1227 | v4l2_planes[plane].length = |
| 1228 | b->m.planes[plane].length; |
| 1229 | } |
| 1230 | } |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1231 | if (b->memory == V4L2_MEMORY_DMABUF) { |
| 1232 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1233 | v4l2_planes[plane].m.fd = |
| 1234 | b->m.planes[plane].m.fd; |
| 1235 | v4l2_planes[plane].length = |
| 1236 | b->m.planes[plane].length; |
| 1237 | v4l2_planes[plane].data_offset = |
| 1238 | b->m.planes[plane].data_offset; |
| 1239 | } |
| 1240 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1241 | } else { |
| 1242 | /* |
| 1243 | * Single-planar buffers do not use planes array, |
| 1244 | * so fill in relevant v4l2_buffer struct fields instead. |
| 1245 | * In videobuf we use our internal V4l2_planes struct for |
| 1246 | * single-planar buffers as well, for simplicity. |
| 1247 | */ |
Laurent Pinchart | ac706bf | 2012-12-17 07:38:16 -0300 | [diff] [blame] | 1248 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1249 | v4l2_planes[0].bytesused = b->bytesused; |
Laurent Pinchart | ac706bf | 2012-12-17 07:38:16 -0300 | [diff] [blame] | 1250 | v4l2_planes[0].data_offset = 0; |
| 1251 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1252 | |
| 1253 | if (b->memory == V4L2_MEMORY_USERPTR) { |
| 1254 | v4l2_planes[0].m.userptr = b->m.userptr; |
| 1255 | v4l2_planes[0].length = b->length; |
| 1256 | } |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1257 | |
| 1258 | if (b->memory == V4L2_MEMORY_DMABUF) { |
| 1259 | v4l2_planes[0].m.fd = b->m.fd; |
| 1260 | v4l2_planes[0].length = b->length; |
| 1261 | v4l2_planes[0].data_offset = 0; |
| 1262 | } |
| 1263 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1264 | } |
| 1265 | |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1266 | /* Zero flags that the vb2 core handles */ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 1267 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
Sakari Ailus | 7ce6fd8 | 2014-02-25 19:08:52 -0300 | [diff] [blame] | 1268 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
| 1269 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 1270 | /* |
| 1271 | * Non-COPY timestamps and non-OUTPUT queues will get |
| 1272 | * their timestamp and timestamp source flags from the |
| 1273 | * queue. |
| 1274 | */ |
| 1275 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 1276 | } |
| 1277 | |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1278 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 1279 | /* |
| 1280 | * For output buffers mask out the timecode flag: |
| 1281 | * this will be handled later in vb2_internal_qbuf(). |
| 1282 | * The 'field' is valid metadata for this output buffer |
| 1283 | * and so that needs to be copied here. |
| 1284 | */ |
| 1285 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; |
| 1286 | vb->v4l2_buf.field = b->field; |
| 1287 | } else { |
| 1288 | /* Zero any output buffer flags as this is a capture buffer */ |
| 1289 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; |
| 1290 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1291 | } |
| 1292 | |
| 1293 | /** |
| 1294 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer |
| 1295 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1296 | static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1297 | { |
| 1298 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; |
| 1299 | struct vb2_queue *q = vb->vb2_queue; |
| 1300 | void *mem_priv; |
| 1301 | unsigned int plane; |
| 1302 | int ret; |
| 1303 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1304 | bool reacquired = vb->planes[0].mem_priv == NULL; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1305 | |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1306 | /* Copy relevant information provided by the userspace */ |
| 1307 | __fill_vb2_buffer(vb, b, planes); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1308 | |
| 1309 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1310 | /* Skip the plane if already verified */ |
Marek Szyprowski | f0b7c7f | 2011-11-16 15:09:40 -0300 | [diff] [blame] | 1311 | if (vb->v4l2_planes[plane].m.userptr && |
| 1312 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1313 | && vb->v4l2_planes[plane].length == planes[plane].length) |
| 1314 | continue; |
| 1315 | |
| 1316 | dprintk(3, "qbuf: userspace address for plane %d changed, " |
| 1317 | "reacquiring memory\n", plane); |
| 1318 | |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1319 | /* Check if the provided plane buffer is large enough */ |
| 1320 | if (planes[plane].length < q->plane_sizes[plane]) { |
Seung-Woo Kim | 2484a7e | 2013-08-20 04:48:06 -0300 | [diff] [blame] | 1321 | dprintk(1, "qbuf: provided buffer size %u is less than " |
| 1322 | "setup size %u for plane %d\n", |
| 1323 | planes[plane].length, |
| 1324 | q->plane_sizes[plane], plane); |
Marek Szyprowski | 4c2625d | 2011-10-03 03:21:45 -0300 | [diff] [blame] | 1325 | ret = -EINVAL; |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1326 | goto err; |
| 1327 | } |
| 1328 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1329 | /* Release previously acquired memory if present */ |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1330 | if (vb->planes[plane].mem_priv) { |
| 1331 | if (!reacquired) { |
| 1332 | reacquired = true; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1333 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1334 | } |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1335 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1336 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1337 | |
| 1338 | vb->planes[plane].mem_priv = NULL; |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1339 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1340 | |
| 1341 | /* Acquire each plane's memory */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1342 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1343 | planes[plane].m.userptr, |
| 1344 | planes[plane].length, write); |
| 1345 | if (IS_ERR_OR_NULL(mem_priv)) { |
| 1346 | dprintk(1, "qbuf: failed acquiring userspace " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1347 | "memory for plane %d\n", plane); |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1348 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
| 1349 | goto err; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1350 | } |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1351 | vb->planes[plane].mem_priv = mem_priv; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1352 | } |
| 1353 | |
| 1354 | /* |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1355 | * Now that everything is in order, copy relevant information |
| 1356 | * provided by userspace. |
| 1357 | */ |
| 1358 | for (plane = 0; plane < vb->num_planes; ++plane) |
| 1359 | vb->v4l2_planes[plane] = planes[plane]; |
| 1360 | |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1361 | if (reacquired) { |
| 1362 | /* |
| 1363 | * One or more planes changed, so we must call buf_init to do |
| 1364 | * the driver-specific initialization on the newly acquired |
| 1365 | * buffer, if provided. |
| 1366 | */ |
| 1367 | ret = call_vb_qop(vb, buf_init, vb); |
| 1368 | if (ret) { |
| 1369 | dprintk(1, "qbuf: buffer initialization failed\n"); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1370 | goto err; |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | ret = call_vb_qop(vb, buf_prepare, vb); |
| 1375 | if (ret) { |
| 1376 | dprintk(1, "qbuf: buffer preparation failed\n"); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1377 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1378 | goto err; |
| 1379 | } |
| 1380 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1381 | return 0; |
| 1382 | err: |
| 1383 | /* In case of errors, release planes that were already acquired */ |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1384 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1385 | if (vb->planes[plane].mem_priv) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1386 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1387 | vb->planes[plane].mem_priv = NULL; |
| 1388 | vb->v4l2_planes[plane].m.userptr = 0; |
| 1389 | vb->v4l2_planes[plane].length = 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1390 | } |
| 1391 | |
| 1392 | return ret; |
| 1393 | } |
| 1394 | |
| 1395 | /** |
| 1396 | * __qbuf_mmap() - handle qbuf of an MMAP buffer |
| 1397 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1398 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1399 | { |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1400 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1401 | return call_vb_qop(vb, buf_prepare, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1402 | } |
| 1403 | |
| 1404 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1405 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer |
| 1406 | */ |
| 1407 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 1408 | { |
| 1409 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; |
| 1410 | struct vb2_queue *q = vb->vb2_queue; |
| 1411 | void *mem_priv; |
| 1412 | unsigned int plane; |
| 1413 | int ret; |
| 1414 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1415 | bool reacquired = vb->planes[0].mem_priv == NULL; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1416 | |
Laurent Pinchart | 6f546c5 | 2014-01-01 09:10:48 -0300 | [diff] [blame] | 1417 | /* Copy relevant information provided by the userspace */ |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1418 | __fill_vb2_buffer(vb, b, planes); |
| 1419 | |
| 1420 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1421 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); |
| 1422 | |
| 1423 | if (IS_ERR_OR_NULL(dbuf)) { |
| 1424 | dprintk(1, "qbuf: invalid dmabuf fd for plane %d\n", |
| 1425 | plane); |
| 1426 | ret = -EINVAL; |
| 1427 | goto err; |
| 1428 | } |
| 1429 | |
| 1430 | /* use DMABUF size if length is not provided */ |
| 1431 | if (planes[plane].length == 0) |
| 1432 | planes[plane].length = dbuf->size; |
| 1433 | |
| 1434 | if (planes[plane].length < planes[plane].data_offset + |
| 1435 | q->plane_sizes[plane]) { |
Seung-Woo Kim | 77c0782 | 2013-11-29 04:50:29 -0300 | [diff] [blame] | 1436 | dprintk(1, "qbuf: invalid dmabuf length for plane %d\n", |
| 1437 | plane); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1438 | ret = -EINVAL; |
| 1439 | goto err; |
| 1440 | } |
| 1441 | |
| 1442 | /* Skip the plane if already verified */ |
| 1443 | if (dbuf == vb->planes[plane].dbuf && |
| 1444 | vb->v4l2_planes[plane].length == planes[plane].length) { |
| 1445 | dma_buf_put(dbuf); |
| 1446 | continue; |
| 1447 | } |
| 1448 | |
| 1449 | dprintk(1, "qbuf: buffer for plane %d changed\n", plane); |
| 1450 | |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1451 | if (!reacquired) { |
| 1452 | reacquired = true; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1453 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1454 | } |
| 1455 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1456 | /* Release previously acquired memory if present */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 1457 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1458 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
| 1459 | |
| 1460 | /* Acquire each plane's memory */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1461 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1462 | dbuf, planes[plane].length, write); |
| 1463 | if (IS_ERR(mem_priv)) { |
| 1464 | dprintk(1, "qbuf: failed to attach dmabuf\n"); |
| 1465 | ret = PTR_ERR(mem_priv); |
| 1466 | dma_buf_put(dbuf); |
| 1467 | goto err; |
| 1468 | } |
| 1469 | |
| 1470 | vb->planes[plane].dbuf = dbuf; |
| 1471 | vb->planes[plane].mem_priv = mem_priv; |
| 1472 | } |
| 1473 | |
| 1474 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but |
| 1475 | * really we want to do this just before the DMA, not while queueing |
| 1476 | * the buffer(s).. |
| 1477 | */ |
| 1478 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 1479 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1480 | if (ret) { |
| 1481 | dprintk(1, "qbuf: failed to map dmabuf for plane %d\n", |
| 1482 | plane); |
| 1483 | goto err; |
| 1484 | } |
| 1485 | vb->planes[plane].dbuf_mapped = 1; |
| 1486 | } |
| 1487 | |
| 1488 | /* |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1489 | * Now that everything is in order, copy relevant information |
| 1490 | * provided by userspace. |
| 1491 | */ |
| 1492 | for (plane = 0; plane < vb->num_planes; ++plane) |
| 1493 | vb->v4l2_planes[plane] = planes[plane]; |
| 1494 | |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1495 | if (reacquired) { |
| 1496 | /* |
| 1497 | * Call driver-specific initialization on the newly acquired buffer, |
| 1498 | * if provided. |
| 1499 | */ |
| 1500 | ret = call_vb_qop(vb, buf_init, vb); |
| 1501 | if (ret) { |
| 1502 | dprintk(1, "qbuf: buffer initialization failed\n"); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1503 | goto err; |
| 1504 | } |
| 1505 | } |
| 1506 | |
| 1507 | ret = call_vb_qop(vb, buf_prepare, vb); |
| 1508 | if (ret) { |
| 1509 | dprintk(1, "qbuf: buffer preparation failed\n"); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1510 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1511 | goto err; |
| 1512 | } |
| 1513 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1514 | return 0; |
| 1515 | err: |
| 1516 | /* In case of errors, release planes that were already acquired */ |
| 1517 | __vb2_buf_dmabuf_put(vb); |
| 1518 | |
| 1519 | return ret; |
| 1520 | } |
| 1521 | |
| 1522 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1523 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing |
| 1524 | */ |
| 1525 | static void __enqueue_in_driver(struct vb2_buffer *vb) |
| 1526 | { |
| 1527 | struct vb2_queue *q = vb->vb2_queue; |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1528 | unsigned int plane; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1529 | |
| 1530 | vb->state = VB2_BUF_STATE_ACTIVE; |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 1531 | atomic_inc(&q->owned_by_drv_count); |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1532 | |
| 1533 | /* sync buffers */ |
| 1534 | for (plane = 0; plane < vb->num_planes; ++plane) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1535 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1536 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1537 | call_void_vb_qop(vb, buf_queue, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1538 | } |
| 1539 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1540 | static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1541 | { |
| 1542 | struct vb2_queue *q = vb->vb2_queue; |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1543 | struct rw_semaphore *mmap_sem; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1544 | int ret; |
| 1545 | |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 1546 | ret = __verify_length(vb, b); |
Sylwester Nawrocki | 3a9621b | 2013-08-26 11:47:53 -0300 | [diff] [blame] | 1547 | if (ret < 0) { |
| 1548 | dprintk(1, "%s(): plane parameters verification failed: %d\n", |
| 1549 | __func__, ret); |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 1550 | return ret; |
Sylwester Nawrocki | 3a9621b | 2013-08-26 11:47:53 -0300 | [diff] [blame] | 1551 | } |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 1552 | |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1553 | vb->state = VB2_BUF_STATE_PREPARING; |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1554 | vb->v4l2_buf.timestamp.tv_sec = 0; |
| 1555 | vb->v4l2_buf.timestamp.tv_usec = 0; |
| 1556 | vb->v4l2_buf.sequence = 0; |
| 1557 | |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1558 | switch (q->memory) { |
| 1559 | case V4L2_MEMORY_MMAP: |
| 1560 | ret = __qbuf_mmap(vb, b); |
| 1561 | break; |
| 1562 | case V4L2_MEMORY_USERPTR: |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1563 | /* |
Mauro Carvalho Chehab | f103b5d | 2014-01-07 07:03:09 -0200 | [diff] [blame] | 1564 | * In case of user pointer buffers vb2 allocators need to get |
| 1565 | * direct access to userspace pages. This requires getting |
| 1566 | * the mmap semaphore for read access in the current process |
| 1567 | * structure. The same semaphore is taken before calling mmap |
| 1568 | * operation, while both qbuf/prepare_buf and mmap are called |
| 1569 | * by the driver or v4l2 core with the driver's lock held. |
| 1570 | * To avoid an AB-BA deadlock (mmap_sem then driver's lock in |
| 1571 | * mmap and driver's lock then mmap_sem in qbuf/prepare_buf), |
| 1572 | * the videobuf2 core releases the driver's lock, takes |
| 1573 | * mmap_sem and then takes the driver's lock again. |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1574 | */ |
| 1575 | mmap_sem = ¤t->mm->mmap_sem; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1576 | call_void_qop(q, wait_prepare, q); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1577 | down_read(mmap_sem); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1578 | call_void_qop(q, wait_finish, q); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1579 | |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1580 | ret = __qbuf_userptr(vb, b); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1581 | |
| 1582 | up_read(mmap_sem); |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1583 | break; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1584 | case V4L2_MEMORY_DMABUF: |
| 1585 | ret = __qbuf_dmabuf(vb, b); |
| 1586 | break; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1587 | default: |
| 1588 | WARN(1, "Invalid queue type\n"); |
| 1589 | ret = -EINVAL; |
| 1590 | } |
| 1591 | |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1592 | if (ret) |
| 1593 | dprintk(1, "qbuf: buffer preparation failed: %d\n", ret); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1594 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1595 | |
| 1596 | return ret; |
| 1597 | } |
| 1598 | |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1599 | static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b, |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1600 | const char *opname) |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1601 | { |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1602 | if (b->type != q->type) { |
| 1603 | dprintk(1, "%s(): invalid buffer type\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1604 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1605 | } |
| 1606 | |
| 1607 | if (b->index >= q->num_buffers) { |
| 1608 | dprintk(1, "%s(): buffer index out of range\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1609 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1610 | } |
| 1611 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1612 | if (q->bufs[b->index] == NULL) { |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1613 | /* Should never happen */ |
| 1614 | dprintk(1, "%s(): buffer is NULL\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1615 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1616 | } |
| 1617 | |
| 1618 | if (b->memory != q->memory) { |
| 1619 | dprintk(1, "%s(): invalid memory type\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1620 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1621 | } |
| 1622 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1623 | return __verify_planes_array(q->bufs[b->index], b); |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1624 | } |
| 1625 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1626 | /** |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1627 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
| 1628 | * @q: videobuf2 queue |
| 1629 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
| 1630 | * handler in driver |
| 1631 | * |
| 1632 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
| 1633 | * This function: |
| 1634 | * 1) verifies the passed buffer, |
| 1635 | * 2) calls buf_prepare callback in the driver (if provided), in which |
| 1636 | * driver-specific buffer initialization can be performed, |
| 1637 | * |
| 1638 | * The return values from this function are intended to be directly returned |
| 1639 | * from vidioc_prepare_buf handler in driver. |
| 1640 | */ |
| 1641 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 1642 | { |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1643 | struct vb2_buffer *vb; |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1644 | int ret; |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1645 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1646 | if (q->fileio) { |
| 1647 | dprintk(1, "%s(): file io in progress\n", __func__); |
| 1648 | return -EBUSY; |
| 1649 | } |
| 1650 | |
| 1651 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1652 | if (ret) |
| 1653 | return ret; |
| 1654 | |
| 1655 | vb = q->bufs[b->index]; |
| 1656 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { |
| 1657 | dprintk(1, "%s(): invalid buffer state %d\n", __func__, |
| 1658 | vb->state); |
| 1659 | return -EINVAL; |
| 1660 | } |
| 1661 | |
| 1662 | ret = __buf_prepare(vb, b); |
| 1663 | if (!ret) { |
| 1664 | /* Fill buffer information for the userspace */ |
| 1665 | __fill_v4l2_buffer(vb, b); |
| 1666 | |
| 1667 | dprintk(1, "%s() of buffer %d succeeded\n", __func__, vb->v4l2_buf.index); |
| 1668 | } |
| 1669 | return ret; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1670 | } |
| 1671 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); |
| 1672 | |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1673 | /** |
| 1674 | * vb2_start_streaming() - Attempt to start streaming. |
| 1675 | * @q: videobuf2 queue |
| 1676 | * |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1677 | * Attempt to start streaming. When this function is called there must be |
| 1678 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum |
| 1679 | * number of buffers required for the DMA engine to function). If the |
| 1680 | * @start_streaming op fails it is supposed to return all the driver-owned |
| 1681 | * buffers back to vb2 in state QUEUED. Check if that happened and if |
| 1682 | * not warn and reclaim them forcefully. |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1683 | */ |
| 1684 | static int vb2_start_streaming(struct vb2_queue *q) |
| 1685 | { |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1686 | struct vb2_buffer *vb; |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1687 | int ret; |
| 1688 | |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1689 | /* |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1690 | * If any buffers were queued before streamon, |
| 1691 | * we can now pass them to driver for processing. |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1692 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1693 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
| 1694 | __enqueue_in_driver(vb); |
| 1695 | |
| 1696 | /* Tell the driver to start streaming */ |
| 1697 | ret = call_qop(q, start_streaming, q, |
| 1698 | atomic_read(&q->owned_by_drv_count)); |
| 1699 | q->start_streaming_called = ret == 0; |
| 1700 | if (!ret) |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1701 | return 0; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1702 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1703 | dprintk(1, "qbuf: driver refused to start streaming\n"); |
| 1704 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
| 1705 | unsigned i; |
| 1706 | |
| 1707 | /* |
| 1708 | * Forcefully reclaim buffers if the driver did not |
| 1709 | * correctly return them to vb2. |
| 1710 | */ |
| 1711 | for (i = 0; i < q->num_buffers; ++i) { |
| 1712 | vb = q->bufs[i]; |
| 1713 | if (vb->state == VB2_BUF_STATE_ACTIVE) |
| 1714 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); |
| 1715 | } |
| 1716 | /* Must be zero now */ |
| 1717 | WARN_ON(atomic_read(&q->owned_by_drv_count)); |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1718 | } |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1719 | return ret; |
| 1720 | } |
| 1721 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1722 | static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1723 | { |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1724 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
| 1725 | struct vb2_buffer *vb; |
| 1726 | |
| 1727 | if (ret) |
| 1728 | return ret; |
| 1729 | |
| 1730 | vb = q->bufs[b->index]; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1731 | |
| 1732 | switch (vb->state) { |
| 1733 | case VB2_BUF_STATE_DEQUEUED: |
| 1734 | ret = __buf_prepare(vb, b); |
| 1735 | if (ret) |
| 1736 | return ret; |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1737 | break; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1738 | case VB2_BUF_STATE_PREPARED: |
| 1739 | break; |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1740 | case VB2_BUF_STATE_PREPARING: |
| 1741 | dprintk(1, "qbuf: buffer still being prepared\n"); |
| 1742 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1743 | default: |
Hans Verkuil | 952c9ee | 2014-02-10 13:12:00 -0300 | [diff] [blame] | 1744 | dprintk(1, "%s(): invalid buffer state %d\n", __func__, |
| 1745 | vb->state); |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1746 | return -EINVAL; |
| 1747 | } |
| 1748 | |
| 1749 | /* |
| 1750 | * Add to the queued buffers list, a buffer will stay on it until |
| 1751 | * dequeued in dqbuf. |
| 1752 | */ |
| 1753 | list_add_tail(&vb->queued_entry, &q->queued_list); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1754 | q->queued_count++; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1755 | vb->state = VB2_BUF_STATE_QUEUED; |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1756 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
| 1757 | /* |
| 1758 | * For output buffers copy the timestamp if needed, |
| 1759 | * and the timecode field and flag if needed. |
| 1760 | */ |
Sakari Ailus | c57ff79 | 2014-03-01 10:28:02 -0300 | [diff] [blame] | 1761 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 1762 | V4L2_BUF_FLAG_TIMESTAMP_COPY) |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1763 | vb->v4l2_buf.timestamp = b->timestamp; |
| 1764 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; |
| 1765 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) |
| 1766 | vb->v4l2_buf.timecode = b->timecode; |
| 1767 | } |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1768 | |
| 1769 | /* |
| 1770 | * If already streaming, give the buffer to driver for processing. |
| 1771 | * If not, the buffer will be given to driver on next streamon. |
| 1772 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1773 | if (q->start_streaming_called) |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1774 | __enqueue_in_driver(vb); |
| 1775 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1776 | /* Fill buffer information for the userspace */ |
| 1777 | __fill_v4l2_buffer(vb, b); |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1778 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1779 | /* |
| 1780 | * If streamon has been called, and we haven't yet called |
| 1781 | * start_streaming() since not enough buffers were queued, and |
| 1782 | * we now have reached the minimum number of queued buffers, |
| 1783 | * then we can finally call start_streaming(). |
| 1784 | */ |
| 1785 | if (q->streaming && !q->start_streaming_called && |
| 1786 | q->queued_count >= q->min_buffers_needed) { |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1787 | ret = vb2_start_streaming(q); |
| 1788 | if (ret) |
| 1789 | return ret; |
| 1790 | } |
| 1791 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1792 | dprintk(1, "%s() of buffer %d succeeded\n", __func__, vb->v4l2_buf.index); |
| 1793 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1794 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1795 | |
| 1796 | /** |
| 1797 | * vb2_qbuf() - Queue a buffer from userspace |
| 1798 | * @q: videobuf2 queue |
| 1799 | * @b: buffer structure passed from userspace to vidioc_qbuf handler |
| 1800 | * in driver |
| 1801 | * |
| 1802 | * Should be called from vidioc_qbuf ioctl handler of a driver. |
| 1803 | * This function: |
| 1804 | * 1) verifies the passed buffer, |
| 1805 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in |
| 1806 | * which driver-specific buffer initialization can be performed, |
| 1807 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue |
| 1808 | * callback for processing. |
| 1809 | * |
| 1810 | * The return values from this function are intended to be directly returned |
| 1811 | * from vidioc_qbuf handler in driver. |
| 1812 | */ |
| 1813 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 1814 | { |
| 1815 | if (q->fileio) { |
| 1816 | dprintk(1, "%s(): file io in progress\n", __func__); |
| 1817 | return -EBUSY; |
| 1818 | } |
| 1819 | |
| 1820 | return vb2_internal_qbuf(q, b); |
| 1821 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1822 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
| 1823 | |
| 1824 | /** |
| 1825 | * __vb2_wait_for_done_vb() - wait for a buffer to become available |
| 1826 | * for dequeuing |
| 1827 | * |
| 1828 | * Will sleep if required for nonblocking == false. |
| 1829 | */ |
| 1830 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) |
| 1831 | { |
| 1832 | /* |
| 1833 | * All operations on vb_done_list are performed under done_lock |
| 1834 | * spinlock protection. However, buffers may be removed from |
| 1835 | * it and returned to userspace only while holding both driver's |
| 1836 | * lock and the done_lock spinlock. Thus we can be sure that as |
| 1837 | * long as we hold the driver's lock, the list will remain not |
| 1838 | * empty if list_empty() check succeeds. |
| 1839 | */ |
| 1840 | |
| 1841 | for (;;) { |
| 1842 | int ret; |
| 1843 | |
| 1844 | if (!q->streaming) { |
| 1845 | dprintk(1, "Streaming off, will not wait for buffers\n"); |
| 1846 | return -EINVAL; |
| 1847 | } |
| 1848 | |
| 1849 | if (!list_empty(&q->done_list)) { |
| 1850 | /* |
| 1851 | * Found a buffer that we were waiting for. |
| 1852 | */ |
| 1853 | break; |
| 1854 | } |
| 1855 | |
| 1856 | if (nonblocking) { |
| 1857 | dprintk(1, "Nonblocking and no buffers to dequeue, " |
| 1858 | "will not wait\n"); |
| 1859 | return -EAGAIN; |
| 1860 | } |
| 1861 | |
| 1862 | /* |
| 1863 | * We are streaming and blocking, wait for another buffer to |
| 1864 | * become ready or for streamoff. Driver's lock is released to |
| 1865 | * allow streamoff or qbuf to be called while waiting. |
| 1866 | */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1867 | call_void_qop(q, wait_prepare, q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1868 | |
| 1869 | /* |
| 1870 | * All locks have been released, it is safe to sleep now. |
| 1871 | */ |
| 1872 | dprintk(3, "Will sleep waiting for buffers\n"); |
| 1873 | ret = wait_event_interruptible(q->done_wq, |
| 1874 | !list_empty(&q->done_list) || !q->streaming); |
| 1875 | |
| 1876 | /* |
| 1877 | * We need to reevaluate both conditions again after reacquiring |
| 1878 | * the locks or return an error if one occurred. |
| 1879 | */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1880 | call_void_qop(q, wait_finish, q); |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1881 | if (ret) { |
| 1882 | dprintk(1, "Sleep was interrupted\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1883 | return ret; |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1884 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1885 | } |
| 1886 | return 0; |
| 1887 | } |
| 1888 | |
| 1889 | /** |
| 1890 | * __vb2_get_done_vb() - get a buffer ready for dequeuing |
| 1891 | * |
| 1892 | * Will sleep if required for nonblocking == false. |
| 1893 | */ |
| 1894 | static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb, |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1895 | struct v4l2_buffer *b, int nonblocking) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1896 | { |
| 1897 | unsigned long flags; |
| 1898 | int ret; |
| 1899 | |
| 1900 | /* |
| 1901 | * Wait for at least one buffer to become available on the done_list. |
| 1902 | */ |
| 1903 | ret = __vb2_wait_for_done_vb(q, nonblocking); |
| 1904 | if (ret) |
| 1905 | return ret; |
| 1906 | |
| 1907 | /* |
| 1908 | * Driver's lock has been held since we last verified that done_list |
| 1909 | * is not empty, so no need for another list_empty(done_list) check. |
| 1910 | */ |
| 1911 | spin_lock_irqsave(&q->done_lock, flags); |
| 1912 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1913 | /* |
| 1914 | * Only remove the buffer from done_list if v4l2_buffer can handle all |
| 1915 | * the planes. |
| 1916 | */ |
| 1917 | ret = __verify_planes_array(*vb, b); |
| 1918 | if (!ret) |
| 1919 | list_del(&(*vb)->done_entry); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1920 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 1921 | |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1922 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1923 | } |
| 1924 | |
| 1925 | /** |
| 1926 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 |
| 1927 | * @q: videobuf2 queue |
| 1928 | * |
| 1929 | * This function will wait until all buffers that have been given to the driver |
| 1930 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call |
| 1931 | * wait_prepare, wait_finish pair. It is intended to be called with all locks |
| 1932 | * taken, for example from stop_streaming() callback. |
| 1933 | */ |
| 1934 | int vb2_wait_for_all_buffers(struct vb2_queue *q) |
| 1935 | { |
| 1936 | if (!q->streaming) { |
| 1937 | dprintk(1, "Streaming off, will not wait for buffers\n"); |
| 1938 | return -EINVAL; |
| 1939 | } |
| 1940 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1941 | if (q->start_streaming_called) |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 1942 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1943 | return 0; |
| 1944 | } |
| 1945 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); |
| 1946 | |
| 1947 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1948 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state |
| 1949 | */ |
| 1950 | static void __vb2_dqbuf(struct vb2_buffer *vb) |
| 1951 | { |
| 1952 | struct vb2_queue *q = vb->vb2_queue; |
| 1953 | unsigned int i; |
| 1954 | |
| 1955 | /* nothing to do if the buffer is already dequeued */ |
| 1956 | if (vb->state == VB2_BUF_STATE_DEQUEUED) |
| 1957 | return; |
| 1958 | |
| 1959 | vb->state = VB2_BUF_STATE_DEQUEUED; |
| 1960 | |
| 1961 | /* unmap DMABUF buffer */ |
| 1962 | if (q->memory == V4L2_MEMORY_DMABUF) |
| 1963 | for (i = 0; i < vb->num_planes; ++i) { |
| 1964 | if (!vb->planes[i].dbuf_mapped) |
| 1965 | continue; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1966 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1967 | vb->planes[i].dbuf_mapped = 0; |
| 1968 | } |
| 1969 | } |
| 1970 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1971 | static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1972 | { |
| 1973 | struct vb2_buffer *vb = NULL; |
| 1974 | int ret; |
| 1975 | |
| 1976 | if (b->type != q->type) { |
| 1977 | dprintk(1, "dqbuf: invalid buffer type\n"); |
| 1978 | return -EINVAL; |
| 1979 | } |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1980 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
| 1981 | if (ret < 0) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1982 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1983 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1984 | switch (vb->state) { |
| 1985 | case VB2_BUF_STATE_DONE: |
| 1986 | dprintk(3, "dqbuf: Returning done buffer\n"); |
| 1987 | break; |
| 1988 | case VB2_BUF_STATE_ERROR: |
| 1989 | dprintk(3, "dqbuf: Returning done buffer with errors\n"); |
| 1990 | break; |
| 1991 | default: |
| 1992 | dprintk(1, "dqbuf: Invalid buffer state\n"); |
| 1993 | return -EINVAL; |
| 1994 | } |
| 1995 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 1996 | call_void_vb_qop(vb, buf_finish, vb); |
Hans Verkuil | 9cf3c31 | 2014-02-28 13:30:48 -0300 | [diff] [blame] | 1997 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1998 | /* Fill buffer information for the userspace */ |
| 1999 | __fill_v4l2_buffer(vb, b); |
| 2000 | /* Remove from videobuf queue */ |
| 2001 | list_del(&vb->queued_entry); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2002 | q->queued_count--; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 2003 | /* go back to dequeued state */ |
| 2004 | __vb2_dqbuf(vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2005 | |
| 2006 | dprintk(1, "dqbuf of buffer %d, with state %d\n", |
| 2007 | vb->v4l2_buf.index, vb->state); |
| 2008 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2009 | return 0; |
| 2010 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2011 | |
| 2012 | /** |
| 2013 | * vb2_dqbuf() - Dequeue a buffer to the userspace |
| 2014 | * @q: videobuf2 queue |
| 2015 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler |
| 2016 | * in driver |
| 2017 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no |
| 2018 | * buffers ready for dequeuing are present. Normally the driver |
| 2019 | * would be passing (file->f_flags & O_NONBLOCK) here |
| 2020 | * |
| 2021 | * Should be called from vidioc_dqbuf ioctl handler of a driver. |
| 2022 | * This function: |
| 2023 | * 1) verifies the passed buffer, |
| 2024 | * 2) calls buf_finish callback in the driver (if provided), in which |
| 2025 | * driver can perform any additional operations that may be required before |
| 2026 | * returning the buffer to userspace, such as cache sync, |
| 2027 | * 3) the buffer struct members are filled with relevant information for |
| 2028 | * the userspace. |
| 2029 | * |
| 2030 | * The return values from this function are intended to be directly returned |
| 2031 | * from vidioc_dqbuf handler in driver. |
| 2032 | */ |
| 2033 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
| 2034 | { |
| 2035 | if (q->fileio) { |
| 2036 | dprintk(1, "dqbuf: file io in progress\n"); |
| 2037 | return -EBUSY; |
| 2038 | } |
| 2039 | return vb2_internal_dqbuf(q, b, nonblocking); |
| 2040 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2041 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
| 2042 | |
| 2043 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2044 | * __vb2_queue_cancel() - cancel and stop (pause) streaming |
| 2045 | * |
| 2046 | * Removes all queued buffers from driver's queue and all buffers queued by |
| 2047 | * userspace from videobuf's queue. Returns to state after reqbufs. |
| 2048 | */ |
| 2049 | static void __vb2_queue_cancel(struct vb2_queue *q) |
| 2050 | { |
| 2051 | unsigned int i; |
| 2052 | |
| 2053 | /* |
| 2054 | * Tell driver to stop all transactions and release all queued |
| 2055 | * buffers. |
| 2056 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2057 | if (q->start_streaming_called) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2058 | call_qop(q, stop_streaming, q); |
| 2059 | q->streaming = 0; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2060 | q->start_streaming_called = 0; |
| 2061 | q->queued_count = 0; |
| 2062 | |
| 2063 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
| 2064 | for (i = 0; i < q->num_buffers; ++i) |
| 2065 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) |
| 2066 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); |
| 2067 | /* Must be zero now */ |
| 2068 | WARN_ON(atomic_read(&q->owned_by_drv_count)); |
| 2069 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2070 | |
| 2071 | /* |
| 2072 | * Remove all buffers from videobuf's list... |
| 2073 | */ |
| 2074 | INIT_LIST_HEAD(&q->queued_list); |
| 2075 | /* |
| 2076 | * ...and done list; userspace will not receive any buffers it |
| 2077 | * has not already dequeued before initiating cancel. |
| 2078 | */ |
| 2079 | INIT_LIST_HEAD(&q->done_list); |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 2080 | atomic_set(&q->owned_by_drv_count, 0); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2081 | wake_up_all(&q->done_wq); |
| 2082 | |
| 2083 | /* |
| 2084 | * Reinitialize all buffers for next use. |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 2085 | * Make sure to call buf_finish for any queued buffers. Normally |
| 2086 | * that's done in dqbuf, but that's not going to happen when we |
| 2087 | * cancel the whole queue. Note: this code belongs here, not in |
| 2088 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical |
| 2089 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't |
| 2090 | * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2091 | */ |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 2092 | for (i = 0; i < q->num_buffers; ++i) { |
| 2093 | struct vb2_buffer *vb = q->bufs[i]; |
| 2094 | |
| 2095 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { |
| 2096 | vb->state = VB2_BUF_STATE_PREPARED; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 2097 | call_void_vb_qop(vb, buf_finish, vb); |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 2098 | } |
| 2099 | __vb2_dqbuf(vb); |
| 2100 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2101 | } |
| 2102 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2103 | static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2104 | { |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2105 | int ret; |
| 2106 | |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2107 | if (type != q->type) { |
| 2108 | dprintk(1, "streamon: invalid stream type\n"); |
| 2109 | return -EINVAL; |
| 2110 | } |
| 2111 | |
| 2112 | if (q->streaming) { |
Ricardo Ribalda | f956035 | 2013-11-08 07:08:45 -0300 | [diff] [blame] | 2113 | dprintk(3, "streamon successful: already streaming\n"); |
| 2114 | return 0; |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2115 | } |
| 2116 | |
Ricardo Ribalda | 548df78 | 2014-01-08 05:01:33 -0300 | [diff] [blame] | 2117 | if (!q->num_buffers) { |
| 2118 | dprintk(1, "streamon: no buffers have been allocated\n"); |
| 2119 | return -EINVAL; |
| 2120 | } |
| 2121 | |
Ricardo Ribalda Delgado | 249f5a5 | 2014-01-08 05:01:33 -0300 | [diff] [blame] | 2122 | if (!q->num_buffers) { |
| 2123 | dprintk(1, "streamon: no buffers have been allocated\n"); |
| 2124 | return -EINVAL; |
| 2125 | } |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2126 | if (q->num_buffers < q->min_buffers_needed) { |
| 2127 | dprintk(1, "streamon: need at least %u allocated buffers\n", |
| 2128 | q->min_buffers_needed); |
| 2129 | return -EINVAL; |
| 2130 | } |
Ricardo Ribalda Delgado | 249f5a5 | 2014-01-08 05:01:33 -0300 | [diff] [blame] | 2131 | |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2132 | /* |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2133 | * Tell driver to start streaming provided sufficient buffers |
| 2134 | * are available. |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2135 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2136 | if (q->queued_count >= q->min_buffers_needed) { |
| 2137 | ret = vb2_start_streaming(q); |
| 2138 | if (ret) { |
| 2139 | __vb2_queue_cancel(q); |
| 2140 | return ret; |
| 2141 | } |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2142 | } |
| 2143 | |
| 2144 | q->streaming = 1; |
| 2145 | |
| 2146 | dprintk(3, "Streamon successful\n"); |
| 2147 | return 0; |
| 2148 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2149 | |
| 2150 | /** |
| 2151 | * vb2_streamon - start streaming |
| 2152 | * @q: videobuf2 queue |
| 2153 | * @type: type argument passed from userspace to vidioc_streamon handler |
| 2154 | * |
| 2155 | * Should be called from vidioc_streamon handler of a driver. |
| 2156 | * This function: |
| 2157 | * 1) verifies current state |
| 2158 | * 2) passes any previously queued buffers to the driver and starts streaming |
| 2159 | * |
| 2160 | * The return values from this function are intended to be directly returned |
| 2161 | * from vidioc_streamon handler in the driver. |
| 2162 | */ |
| 2163 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
| 2164 | { |
| 2165 | if (q->fileio) { |
| 2166 | dprintk(1, "streamon: file io in progress\n"); |
| 2167 | return -EBUSY; |
| 2168 | } |
| 2169 | return vb2_internal_streamon(q, type); |
| 2170 | } |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2171 | EXPORT_SYMBOL_GPL(vb2_streamon); |
| 2172 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2173 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
| 2174 | { |
| 2175 | if (type != q->type) { |
| 2176 | dprintk(1, "streamoff: invalid stream type\n"); |
| 2177 | return -EINVAL; |
| 2178 | } |
| 2179 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2180 | /* |
| 2181 | * Cancel will pause streaming and remove all buffers from the driver |
| 2182 | * and videobuf, effectively returning control over them to userspace. |
Hans Verkuil | 3f1a9a3 | 2014-02-25 09:42:45 -0300 | [diff] [blame] | 2183 | * |
| 2184 | * Note that we do this even if q->streaming == 0: if you prepare or |
| 2185 | * queue buffers, and then call streamoff without ever having called |
| 2186 | * streamon, you would still expect those buffers to be returned to |
| 2187 | * their normal dequeued state. |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2188 | */ |
| 2189 | __vb2_queue_cancel(q); |
| 2190 | |
| 2191 | dprintk(3, "Streamoff successful\n"); |
| 2192 | return 0; |
| 2193 | } |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2194 | |
| 2195 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2196 | * vb2_streamoff - stop streaming |
| 2197 | * @q: videobuf2 queue |
| 2198 | * @type: type argument passed from userspace to vidioc_streamoff handler |
| 2199 | * |
| 2200 | * Should be called from vidioc_streamoff handler of a driver. |
| 2201 | * This function: |
| 2202 | * 1) verifies current state, |
| 2203 | * 2) stop streaming and dequeues any queued buffers, including those previously |
| 2204 | * passed to the driver (after waiting for the driver to finish). |
| 2205 | * |
| 2206 | * This call can be used for pausing playback. |
| 2207 | * The return values from this function are intended to be directly returned |
| 2208 | * from vidioc_streamoff handler in the driver |
| 2209 | */ |
| 2210 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
| 2211 | { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2212 | if (q->fileio) { |
| 2213 | dprintk(1, "streamoff: file io in progress\n"); |
| 2214 | return -EBUSY; |
| 2215 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2216 | return vb2_internal_streamoff(q, type); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2217 | } |
| 2218 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
| 2219 | |
| 2220 | /** |
| 2221 | * __find_plane_by_offset() - find plane associated with the given offset off |
| 2222 | */ |
| 2223 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, |
| 2224 | unsigned int *_buffer, unsigned int *_plane) |
| 2225 | { |
| 2226 | struct vb2_buffer *vb; |
| 2227 | unsigned int buffer, plane; |
| 2228 | |
| 2229 | /* |
| 2230 | * Go over all buffers and their planes, comparing the given offset |
| 2231 | * with an offset assigned to each plane. If a match is found, |
| 2232 | * return its buffer and plane numbers. |
| 2233 | */ |
| 2234 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { |
| 2235 | vb = q->bufs[buffer]; |
| 2236 | |
| 2237 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 2238 | if (vb->v4l2_planes[plane].m.mem_offset == off) { |
| 2239 | *_buffer = buffer; |
| 2240 | *_plane = plane; |
| 2241 | return 0; |
| 2242 | } |
| 2243 | } |
| 2244 | } |
| 2245 | |
| 2246 | return -EINVAL; |
| 2247 | } |
| 2248 | |
| 2249 | /** |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2250 | * vb2_expbuf() - Export a buffer as a file descriptor |
| 2251 | * @q: videobuf2 queue |
| 2252 | * @eb: export buffer structure passed from userspace to vidioc_expbuf |
| 2253 | * handler in driver |
| 2254 | * |
| 2255 | * The return values from this function are intended to be directly returned |
| 2256 | * from vidioc_expbuf handler in driver. |
| 2257 | */ |
| 2258 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) |
| 2259 | { |
| 2260 | struct vb2_buffer *vb = NULL; |
| 2261 | struct vb2_plane *vb_plane; |
| 2262 | int ret; |
| 2263 | struct dma_buf *dbuf; |
| 2264 | |
| 2265 | if (q->memory != V4L2_MEMORY_MMAP) { |
| 2266 | dprintk(1, "Queue is not currently set up for mmap\n"); |
| 2267 | return -EINVAL; |
| 2268 | } |
| 2269 | |
| 2270 | if (!q->mem_ops->get_dmabuf) { |
| 2271 | dprintk(1, "Queue does not support DMA buffer exporting\n"); |
| 2272 | return -EINVAL; |
| 2273 | } |
| 2274 | |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame] | 2275 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
| 2276 | dprintk(1, "Queue does support only O_CLOEXEC and access mode flags\n"); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2277 | return -EINVAL; |
| 2278 | } |
| 2279 | |
| 2280 | if (eb->type != q->type) { |
| 2281 | dprintk(1, "qbuf: invalid buffer type\n"); |
| 2282 | return -EINVAL; |
| 2283 | } |
| 2284 | |
| 2285 | if (eb->index >= q->num_buffers) { |
| 2286 | dprintk(1, "buffer index out of range\n"); |
| 2287 | return -EINVAL; |
| 2288 | } |
| 2289 | |
| 2290 | vb = q->bufs[eb->index]; |
| 2291 | |
| 2292 | if (eb->plane >= vb->num_planes) { |
| 2293 | dprintk(1, "buffer plane out of range\n"); |
| 2294 | return -EINVAL; |
| 2295 | } |
| 2296 | |
| 2297 | vb_plane = &vb->planes[eb->plane]; |
| 2298 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 2299 | dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv, eb->flags & O_ACCMODE); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2300 | if (IS_ERR_OR_NULL(dbuf)) { |
| 2301 | dprintk(1, "Failed to export buffer %d, plane %d\n", |
| 2302 | eb->index, eb->plane); |
| 2303 | return -EINVAL; |
| 2304 | } |
| 2305 | |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame] | 2306 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2307 | if (ret < 0) { |
| 2308 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", |
| 2309 | eb->index, eb->plane, ret); |
| 2310 | dma_buf_put(dbuf); |
| 2311 | return ret; |
| 2312 | } |
| 2313 | |
| 2314 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", |
| 2315 | eb->index, eb->plane, ret); |
| 2316 | eb->fd = ret; |
| 2317 | |
| 2318 | return 0; |
| 2319 | } |
| 2320 | EXPORT_SYMBOL_GPL(vb2_expbuf); |
| 2321 | |
| 2322 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2323 | * vb2_mmap() - map video buffers into application address space |
| 2324 | * @q: videobuf2 queue |
| 2325 | * @vma: vma passed to the mmap file operation handler in the driver |
| 2326 | * |
| 2327 | * Should be called from mmap file operation handler of a driver. |
| 2328 | * This function maps one plane of one of the available video buffers to |
| 2329 | * userspace. To map whole video memory allocated on reqbufs, this function |
| 2330 | * has to be called once per each plane per each buffer previously allocated. |
| 2331 | * |
| 2332 | * When the userspace application calls mmap, it passes to it an offset returned |
| 2333 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as |
| 2334 | * a "cookie", which is then used to identify the plane to be mapped. |
| 2335 | * This function finds a plane with a matching offset and a mapping is performed |
| 2336 | * by the means of a provided memory operation. |
| 2337 | * |
| 2338 | * The return values from this function are intended to be directly returned |
| 2339 | * from the mmap handler in driver. |
| 2340 | */ |
| 2341 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) |
| 2342 | { |
| 2343 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2344 | struct vb2_buffer *vb; |
| 2345 | unsigned int buffer, plane; |
| 2346 | int ret; |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 2347 | unsigned long length; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2348 | |
| 2349 | if (q->memory != V4L2_MEMORY_MMAP) { |
| 2350 | dprintk(1, "Queue is not currently set up for mmap\n"); |
| 2351 | return -EINVAL; |
| 2352 | } |
| 2353 | |
| 2354 | /* |
| 2355 | * Check memory area access mode. |
| 2356 | */ |
| 2357 | if (!(vma->vm_flags & VM_SHARED)) { |
| 2358 | dprintk(1, "Invalid vma flags, VM_SHARED needed\n"); |
| 2359 | return -EINVAL; |
| 2360 | } |
| 2361 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
| 2362 | if (!(vma->vm_flags & VM_WRITE)) { |
| 2363 | dprintk(1, "Invalid vma flags, VM_WRITE needed\n"); |
| 2364 | return -EINVAL; |
| 2365 | } |
| 2366 | } else { |
| 2367 | if (!(vma->vm_flags & VM_READ)) { |
| 2368 | dprintk(1, "Invalid vma flags, VM_READ needed\n"); |
| 2369 | return -EINVAL; |
| 2370 | } |
| 2371 | } |
| 2372 | |
| 2373 | /* |
| 2374 | * Find the plane corresponding to the offset passed by userspace. |
| 2375 | */ |
| 2376 | ret = __find_plane_by_offset(q, off, &buffer, &plane); |
| 2377 | if (ret) |
| 2378 | return ret; |
| 2379 | |
| 2380 | vb = q->bufs[buffer]; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2381 | |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 2382 | /* |
| 2383 | * MMAP requires page_aligned buffers. |
| 2384 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), |
| 2385 | * so, we need to do the same here. |
| 2386 | */ |
| 2387 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); |
| 2388 | if (length < (vma->vm_end - vma->vm_start)) { |
| 2389 | dprintk(1, |
| 2390 | "MMAP invalid, as it would overflow buffer length\n"); |
Seung-Woo Kim | 068a0df | 2013-04-11 23:57:57 -0300 | [diff] [blame] | 2391 | return -EINVAL; |
| 2392 | } |
| 2393 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 2394 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame^] | 2395 | if (ret) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2396 | return ret; |
| 2397 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2398 | dprintk(3, "Buffer %d, plane %d successfully mapped\n", buffer, plane); |
| 2399 | return 0; |
| 2400 | } |
| 2401 | EXPORT_SYMBOL_GPL(vb2_mmap); |
| 2402 | |
Scott Jiang | 6f524ec | 2011-09-21 09:25:23 -0300 | [diff] [blame] | 2403 | #ifndef CONFIG_MMU |
| 2404 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, |
| 2405 | unsigned long addr, |
| 2406 | unsigned long len, |
| 2407 | unsigned long pgoff, |
| 2408 | unsigned long flags) |
| 2409 | { |
| 2410 | unsigned long off = pgoff << PAGE_SHIFT; |
| 2411 | struct vb2_buffer *vb; |
| 2412 | unsigned int buffer, plane; |
| 2413 | int ret; |
| 2414 | |
| 2415 | if (q->memory != V4L2_MEMORY_MMAP) { |
| 2416 | dprintk(1, "Queue is not currently set up for mmap\n"); |
| 2417 | return -EINVAL; |
| 2418 | } |
| 2419 | |
| 2420 | /* |
| 2421 | * Find the plane corresponding to the offset passed by userspace. |
| 2422 | */ |
| 2423 | ret = __find_plane_by_offset(q, off, &buffer, &plane); |
| 2424 | if (ret) |
| 2425 | return ret; |
| 2426 | |
| 2427 | vb = q->bufs[buffer]; |
| 2428 | |
| 2429 | return (unsigned long)vb2_plane_vaddr(vb, plane); |
| 2430 | } |
| 2431 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); |
| 2432 | #endif |
| 2433 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2434 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
| 2435 | static int __vb2_cleanup_fileio(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2436 | |
| 2437 | /** |
| 2438 | * vb2_poll() - implements poll userspace operation |
| 2439 | * @q: videobuf2 queue |
| 2440 | * @file: file argument passed to the poll file operation handler |
| 2441 | * @wait: wait argument passed to the poll file operation handler |
| 2442 | * |
| 2443 | * This function implements poll file operation handler for a driver. |
| 2444 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will |
| 2445 | * be informed that the file descriptor of a video device is available for |
| 2446 | * reading. |
| 2447 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor |
| 2448 | * will be reported as available for writing. |
| 2449 | * |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2450 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
| 2451 | * pending events. |
| 2452 | * |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2453 | * The return values from this function are intended to be directly returned |
| 2454 | * from poll handler in driver. |
| 2455 | */ |
| 2456 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) |
| 2457 | { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2458 | struct video_device *vfd = video_devdata(file); |
Hans Verkuil | bf5c7cb | 2011-07-13 04:01:30 -0300 | [diff] [blame] | 2459 | unsigned long req_events = poll_requested_events(wait); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2460 | struct vb2_buffer *vb = NULL; |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2461 | unsigned int res = 0; |
| 2462 | unsigned long flags; |
| 2463 | |
| 2464 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
| 2465 | struct v4l2_fh *fh = file->private_data; |
| 2466 | |
| 2467 | if (v4l2_event_pending(fh)) |
| 2468 | res = POLLPRI; |
| 2469 | else if (req_events & POLLPRI) |
| 2470 | poll_wait(file, &fh->wait, wait); |
| 2471 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2472 | |
Hans Verkuil | cd13823 | 2013-01-30 13:29:02 -0300 | [diff] [blame] | 2473 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
| 2474 | return res; |
| 2475 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) |
| 2476 | return res; |
| 2477 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2478 | /* |
Pawel Osciak | 4ffabdb | 2011-03-20 18:17:34 -0300 | [diff] [blame] | 2479 | * Start file I/O emulator only if streaming API has not been used yet. |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2480 | */ |
| 2481 | if (q->num_buffers == 0 && q->fileio == NULL) { |
Hans Verkuil | bf5c7cb | 2011-07-13 04:01:30 -0300 | [diff] [blame] | 2482 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
| 2483 | (req_events & (POLLIN | POLLRDNORM))) { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2484 | if (__vb2_init_fileio(q, 1)) |
| 2485 | return res | POLLERR; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2486 | } |
Hans Verkuil | bf5c7cb | 2011-07-13 04:01:30 -0300 | [diff] [blame] | 2487 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
| 2488 | (req_events & (POLLOUT | POLLWRNORM))) { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2489 | if (__vb2_init_fileio(q, 0)) |
| 2490 | return res | POLLERR; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2491 | /* |
| 2492 | * Write to OUTPUT queue can be done immediately. |
| 2493 | */ |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2494 | return res | POLLOUT | POLLWRNORM; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2495 | } |
| 2496 | } |
| 2497 | |
| 2498 | /* |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2499 | * There is nothing to wait for if no buffers have already been queued. |
| 2500 | */ |
| 2501 | if (list_empty(&q->queued_list)) |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2502 | return res | POLLERR; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2503 | |
Seung-Woo Kim | 412cb87 | 2013-05-20 23:47:29 -0300 | [diff] [blame] | 2504 | if (list_empty(&q->done_list)) |
| 2505 | poll_wait(file, &q->done_wq, wait); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2506 | |
| 2507 | /* |
| 2508 | * Take first buffer available for dequeuing. |
| 2509 | */ |
| 2510 | spin_lock_irqsave(&q->done_lock, flags); |
| 2511 | if (!list_empty(&q->done_list)) |
| 2512 | vb = list_first_entry(&q->done_list, struct vb2_buffer, |
| 2513 | done_entry); |
| 2514 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 2515 | |
| 2516 | if (vb && (vb->state == VB2_BUF_STATE_DONE |
| 2517 | || vb->state == VB2_BUF_STATE_ERROR)) { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2518 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
| 2519 | res | POLLOUT | POLLWRNORM : |
| 2520 | res | POLLIN | POLLRDNORM; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2521 | } |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2522 | return res; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2523 | } |
| 2524 | EXPORT_SYMBOL_GPL(vb2_poll); |
| 2525 | |
| 2526 | /** |
| 2527 | * vb2_queue_init() - initialize a videobuf2 queue |
| 2528 | * @q: videobuf2 queue; this structure should be allocated in driver |
| 2529 | * |
| 2530 | * The vb2_queue structure should be allocated by the driver. The driver is |
| 2531 | * responsible of clearing it's content and setting initial values for some |
| 2532 | * required entries before calling this function. |
| 2533 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer |
| 2534 | * to the struct vb2_queue description in include/media/videobuf2-core.h |
| 2535 | * for more information. |
| 2536 | */ |
| 2537 | int vb2_queue_init(struct vb2_queue *q) |
| 2538 | { |
Ezequiel Garcia | 896f38f | 2012-09-17 14:59:30 -0300 | [diff] [blame] | 2539 | /* |
| 2540 | * Sanity check |
| 2541 | */ |
| 2542 | if (WARN_ON(!q) || |
| 2543 | WARN_ON(!q->ops) || |
| 2544 | WARN_ON(!q->mem_ops) || |
| 2545 | WARN_ON(!q->type) || |
| 2546 | WARN_ON(!q->io_modes) || |
| 2547 | WARN_ON(!q->ops->queue_setup) || |
Kamil Debski | 6aa69f9 | 2013-01-25 06:29:57 -0300 | [diff] [blame] | 2548 | WARN_ON(!q->ops->buf_queue) || |
Sakari Ailus | 872484c | 2013-08-25 17:57:03 -0300 | [diff] [blame] | 2549 | WARN_ON(q->timestamp_flags & |
| 2550 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | |
| 2551 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) |
Ezequiel Garcia | 896f38f | 2012-09-17 14:59:30 -0300 | [diff] [blame] | 2552 | return -EINVAL; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2553 | |
Kamil Debski | 6aa69f9 | 2013-01-25 06:29:57 -0300 | [diff] [blame] | 2554 | /* Warn that the driver should choose an appropriate timestamp type */ |
Sakari Ailus | c57ff79 | 2014-03-01 10:28:02 -0300 | [diff] [blame] | 2555 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 2556 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); |
Kamil Debski | 6aa69f9 | 2013-01-25 06:29:57 -0300 | [diff] [blame] | 2557 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2558 | INIT_LIST_HEAD(&q->queued_list); |
| 2559 | INIT_LIST_HEAD(&q->done_list); |
| 2560 | spin_lock_init(&q->done_lock); |
| 2561 | init_waitqueue_head(&q->done_wq); |
| 2562 | |
| 2563 | if (q->buf_struct_size == 0) |
| 2564 | q->buf_struct_size = sizeof(struct vb2_buffer); |
| 2565 | |
| 2566 | return 0; |
| 2567 | } |
| 2568 | EXPORT_SYMBOL_GPL(vb2_queue_init); |
| 2569 | |
| 2570 | /** |
| 2571 | * vb2_queue_release() - stop streaming, release the queue and free memory |
| 2572 | * @q: videobuf2 queue |
| 2573 | * |
| 2574 | * This function stops streaming and performs necessary clean ups, including |
| 2575 | * freeing video buffer memory. The driver is responsible for freeing |
| 2576 | * the vb2_queue structure itself. |
| 2577 | */ |
| 2578 | void vb2_queue_release(struct vb2_queue *q) |
| 2579 | { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2580 | __vb2_cleanup_fileio(q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2581 | __vb2_queue_cancel(q); |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 2582 | __vb2_queue_free(q, q->num_buffers); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2583 | } |
| 2584 | EXPORT_SYMBOL_GPL(vb2_queue_release); |
| 2585 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2586 | /** |
| 2587 | * struct vb2_fileio_buf - buffer context used by file io emulator |
| 2588 | * |
| 2589 | * vb2 provides a compatibility layer and emulator of file io (read and |
| 2590 | * write) calls on top of streaming API. This structure is used for |
| 2591 | * tracking context related to the buffers. |
| 2592 | */ |
| 2593 | struct vb2_fileio_buf { |
| 2594 | void *vaddr; |
| 2595 | unsigned int size; |
| 2596 | unsigned int pos; |
| 2597 | unsigned int queued:1; |
| 2598 | }; |
| 2599 | |
| 2600 | /** |
| 2601 | * struct vb2_fileio_data - queue context used by file io emulator |
| 2602 | * |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2603 | * @cur_index: the index of the buffer currently being read from or |
| 2604 | * written to. If equal to q->num_buffers then a new buffer |
| 2605 | * must be dequeued. |
| 2606 | * @initial_index: in the read() case all buffers are queued up immediately |
| 2607 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles |
| 2608 | * buffers. However, in the write() case no buffers are initially |
| 2609 | * queued, instead whenever a buffer is full it is queued up by |
| 2610 | * __vb2_perform_fileio(). Only once all available buffers have |
| 2611 | * been queued up will __vb2_perform_fileio() start to dequeue |
| 2612 | * buffers. This means that initially __vb2_perform_fileio() |
| 2613 | * needs to know what buffer index to use when it is queuing up |
| 2614 | * the buffers for the first time. That initial index is stored |
| 2615 | * in this field. Once it is equal to q->num_buffers all |
| 2616 | * available buffers have been queued and __vb2_perform_fileio() |
| 2617 | * should start the normal dequeue/queue cycle. |
| 2618 | * |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2619 | * vb2 provides a compatibility layer and emulator of file io (read and |
| 2620 | * write) calls on top of streaming API. For proper operation it required |
| 2621 | * this structure to save the driver state between each call of the read |
| 2622 | * or write function. |
| 2623 | */ |
| 2624 | struct vb2_fileio_data { |
| 2625 | struct v4l2_requestbuffers req; |
| 2626 | struct v4l2_buffer b; |
| 2627 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2628 | unsigned int cur_index; |
| 2629 | unsigned int initial_index; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2630 | unsigned int q_count; |
| 2631 | unsigned int dq_count; |
| 2632 | unsigned int flags; |
| 2633 | }; |
| 2634 | |
| 2635 | /** |
| 2636 | * __vb2_init_fileio() - initialize file io emulator |
| 2637 | * @q: videobuf2 queue |
| 2638 | * @read: mode selector (1 means read, 0 means write) |
| 2639 | */ |
| 2640 | static int __vb2_init_fileio(struct vb2_queue *q, int read) |
| 2641 | { |
| 2642 | struct vb2_fileio_data *fileio; |
| 2643 | int i, ret; |
| 2644 | unsigned int count = 0; |
| 2645 | |
| 2646 | /* |
| 2647 | * Sanity check |
| 2648 | */ |
Hans Verkuil | e4d2581 | 2014-02-03 11:22:45 -0300 | [diff] [blame] | 2649 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
| 2650 | (!read && !(q->io_modes & VB2_WRITE)))) |
| 2651 | return -EINVAL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2652 | |
| 2653 | /* |
| 2654 | * Check if device supports mapping buffers to kernel virtual space. |
| 2655 | */ |
| 2656 | if (!q->mem_ops->vaddr) |
| 2657 | return -EBUSY; |
| 2658 | |
| 2659 | /* |
| 2660 | * Check if streaming api has not been already activated. |
| 2661 | */ |
| 2662 | if (q->streaming || q->num_buffers > 0) |
| 2663 | return -EBUSY; |
| 2664 | |
| 2665 | /* |
| 2666 | * Start with count 1, driver can increase it in queue_setup() |
| 2667 | */ |
| 2668 | count = 1; |
| 2669 | |
| 2670 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", |
| 2671 | (read) ? "read" : "write", count, q->io_flags); |
| 2672 | |
| 2673 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); |
| 2674 | if (fileio == NULL) |
| 2675 | return -ENOMEM; |
| 2676 | |
| 2677 | fileio->flags = q->io_flags; |
| 2678 | |
| 2679 | /* |
| 2680 | * Request buffers and use MMAP type to force driver |
| 2681 | * to allocate buffers by itself. |
| 2682 | */ |
| 2683 | fileio->req.count = count; |
| 2684 | fileio->req.memory = V4L2_MEMORY_MMAP; |
| 2685 | fileio->req.type = q->type; |
| 2686 | ret = vb2_reqbufs(q, &fileio->req); |
| 2687 | if (ret) |
| 2688 | goto err_kfree; |
| 2689 | |
| 2690 | /* |
| 2691 | * Check if plane_count is correct |
| 2692 | * (multiplane buffers are not supported). |
| 2693 | */ |
| 2694 | if (q->bufs[0]->num_planes != 1) { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2695 | ret = -EBUSY; |
| 2696 | goto err_reqbufs; |
| 2697 | } |
| 2698 | |
| 2699 | /* |
| 2700 | * Get kernel address of each buffer. |
| 2701 | */ |
| 2702 | for (i = 0; i < q->num_buffers; i++) { |
| 2703 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); |
Wei Yongjun | 5dd6946 | 2013-05-13 01:48:45 -0300 | [diff] [blame] | 2704 | if (fileio->bufs[i].vaddr == NULL) { |
| 2705 | ret = -EINVAL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2706 | goto err_reqbufs; |
Wei Yongjun | 5dd6946 | 2013-05-13 01:48:45 -0300 | [diff] [blame] | 2707 | } |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2708 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
| 2709 | } |
| 2710 | |
| 2711 | /* |
| 2712 | * Read mode requires pre queuing of all buffers. |
| 2713 | */ |
| 2714 | if (read) { |
| 2715 | /* |
| 2716 | * Queue all buffers. |
| 2717 | */ |
| 2718 | for (i = 0; i < q->num_buffers; i++) { |
| 2719 | struct v4l2_buffer *b = &fileio->b; |
| 2720 | memset(b, 0, sizeof(*b)); |
| 2721 | b->type = q->type; |
| 2722 | b->memory = q->memory; |
| 2723 | b->index = i; |
| 2724 | ret = vb2_qbuf(q, b); |
| 2725 | if (ret) |
| 2726 | goto err_reqbufs; |
| 2727 | fileio->bufs[i].queued = 1; |
| 2728 | } |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2729 | /* |
| 2730 | * All buffers have been queued, so mark that by setting |
| 2731 | * initial_index to q->num_buffers |
| 2732 | */ |
| 2733 | fileio->initial_index = q->num_buffers; |
| 2734 | fileio->cur_index = q->num_buffers; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2735 | } |
| 2736 | |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 2737 | /* |
| 2738 | * Start streaming. |
| 2739 | */ |
| 2740 | ret = vb2_streamon(q, q->type); |
| 2741 | if (ret) |
| 2742 | goto err_reqbufs; |
| 2743 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2744 | q->fileio = fileio; |
| 2745 | |
| 2746 | return ret; |
| 2747 | |
| 2748 | err_reqbufs: |
Hans de Goede | a67e172 | 2012-05-08 14:47:39 -0300 | [diff] [blame] | 2749 | fileio->req.count = 0; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2750 | vb2_reqbufs(q, &fileio->req); |
| 2751 | |
| 2752 | err_kfree: |
| 2753 | kfree(fileio); |
| 2754 | return ret; |
| 2755 | } |
| 2756 | |
| 2757 | /** |
| 2758 | * __vb2_cleanup_fileio() - free resourced used by file io emulator |
| 2759 | * @q: videobuf2 queue |
| 2760 | */ |
| 2761 | static int __vb2_cleanup_fileio(struct vb2_queue *q) |
| 2762 | { |
| 2763 | struct vb2_fileio_data *fileio = q->fileio; |
| 2764 | |
| 2765 | if (fileio) { |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2766 | vb2_internal_streamoff(q, q->type); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2767 | q->fileio = NULL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2768 | fileio->req.count = 0; |
| 2769 | vb2_reqbufs(q, &fileio->req); |
| 2770 | kfree(fileio); |
| 2771 | dprintk(3, "file io emulator closed\n"); |
| 2772 | } |
| 2773 | return 0; |
| 2774 | } |
| 2775 | |
| 2776 | /** |
| 2777 | * __vb2_perform_fileio() - perform a single file io (read or write) operation |
| 2778 | * @q: videobuf2 queue |
| 2779 | * @data: pointed to target userspace buffer |
| 2780 | * @count: number of bytes to read or write |
| 2781 | * @ppos: file handle position tracking pointer |
| 2782 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) |
| 2783 | * @read: access mode selector (1 means read, 0 means write) |
| 2784 | */ |
| 2785 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, |
| 2786 | loff_t *ppos, int nonblock, int read) |
| 2787 | { |
| 2788 | struct vb2_fileio_data *fileio; |
| 2789 | struct vb2_fileio_buf *buf; |
| 2790 | int ret, index; |
| 2791 | |
Mauro Carvalho Chehab | 08b99e2 | 2011-01-11 17:12:34 -0300 | [diff] [blame] | 2792 | dprintk(3, "file io: mode %s, offset %ld, count %zd, %sblocking\n", |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2793 | read ? "read" : "write", (long)*ppos, count, |
| 2794 | nonblock ? "non" : ""); |
| 2795 | |
| 2796 | if (!data) |
| 2797 | return -EINVAL; |
| 2798 | |
| 2799 | /* |
| 2800 | * Initialize emulator on first call. |
| 2801 | */ |
| 2802 | if (!q->fileio) { |
| 2803 | ret = __vb2_init_fileio(q, read); |
| 2804 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); |
| 2805 | if (ret) |
| 2806 | return ret; |
| 2807 | } |
| 2808 | fileio = q->fileio; |
| 2809 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2810 | /* |
| 2811 | * Check if we need to dequeue the buffer. |
| 2812 | */ |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2813 | index = fileio->cur_index; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2814 | if (index >= q->num_buffers) { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2815 | /* |
| 2816 | * Call vb2_dqbuf to get buffer back. |
| 2817 | */ |
| 2818 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 2819 | fileio->b.type = q->type; |
| 2820 | fileio->b.memory = q->memory; |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2821 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2822 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); |
| 2823 | if (ret) |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2824 | return ret; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2825 | fileio->dq_count += 1; |
| 2826 | |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2827 | fileio->cur_index = index = fileio->b.index; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2828 | buf = &fileio->bufs[index]; |
| 2829 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2830 | /* |
| 2831 | * Get number of bytes filled by the driver |
| 2832 | */ |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2833 | buf->pos = 0; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2834 | buf->queued = 0; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2835 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
| 2836 | : vb2_plane_size(q->bufs[index], 0); |
| 2837 | } else { |
| 2838 | buf = &fileio->bufs[index]; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2839 | } |
| 2840 | |
| 2841 | /* |
| 2842 | * Limit count on last few bytes of the buffer. |
| 2843 | */ |
| 2844 | if (buf->pos + count > buf->size) { |
| 2845 | count = buf->size - buf->pos; |
Mauro Carvalho Chehab | 08b99e2 | 2011-01-11 17:12:34 -0300 | [diff] [blame] | 2846 | dprintk(5, "reducing read count: %zd\n", count); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2847 | } |
| 2848 | |
| 2849 | /* |
| 2850 | * Transfer data to userspace. |
| 2851 | */ |
Mauro Carvalho Chehab | 08b99e2 | 2011-01-11 17:12:34 -0300 | [diff] [blame] | 2852 | dprintk(3, "file io: copying %zd bytes - buffer %d, offset %u\n", |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2853 | count, index, buf->pos); |
| 2854 | if (read) |
| 2855 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); |
| 2856 | else |
| 2857 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); |
| 2858 | if (ret) { |
| 2859 | dprintk(3, "file io: error copying data\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2860 | return -EFAULT; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2861 | } |
| 2862 | |
| 2863 | /* |
| 2864 | * Update counters. |
| 2865 | */ |
| 2866 | buf->pos += count; |
| 2867 | *ppos += count; |
| 2868 | |
| 2869 | /* |
| 2870 | * Queue next buffer if required. |
| 2871 | */ |
| 2872 | if (buf->pos == buf->size || |
| 2873 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { |
| 2874 | /* |
| 2875 | * Check if this is the last buffer to read. |
| 2876 | */ |
| 2877 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && |
| 2878 | fileio->dq_count == 1) { |
| 2879 | dprintk(3, "file io: read limit reached\n"); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2880 | return __vb2_cleanup_fileio(q); |
| 2881 | } |
| 2882 | |
| 2883 | /* |
| 2884 | * Call vb2_qbuf and give buffer to the driver. |
| 2885 | */ |
| 2886 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 2887 | fileio->b.type = q->type; |
| 2888 | fileio->b.memory = q->memory; |
| 2889 | fileio->b.index = index; |
| 2890 | fileio->b.bytesused = buf->pos; |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2891 | ret = vb2_internal_qbuf(q, &fileio->b); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2892 | dprintk(5, "file io: vb2_dbuf result: %d\n", ret); |
| 2893 | if (ret) |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2894 | return ret; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2895 | |
| 2896 | /* |
| 2897 | * Buffer has been queued, update the status |
| 2898 | */ |
| 2899 | buf->pos = 0; |
| 2900 | buf->queued = 1; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2901 | buf->size = vb2_plane_size(q->bufs[index], 0); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2902 | fileio->q_count += 1; |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2903 | /* |
| 2904 | * If we are queuing up buffers for the first time, then |
| 2905 | * increase initial_index by one. |
| 2906 | */ |
| 2907 | if (fileio->initial_index < q->num_buffers) |
| 2908 | fileio->initial_index++; |
| 2909 | /* |
| 2910 | * The next buffer to use is either a buffer that's going to be |
| 2911 | * queued for the first time (initial_index < q->num_buffers) |
| 2912 | * or it is equal to q->num_buffers, meaning that the next |
| 2913 | * time we need to dequeue a buffer since we've now queued up |
| 2914 | * all the 'first time' buffers. |
| 2915 | */ |
| 2916 | fileio->cur_index = fileio->initial_index; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2917 | } |
| 2918 | |
| 2919 | /* |
| 2920 | * Return proper number of bytes processed. |
| 2921 | */ |
| 2922 | if (ret == 0) |
| 2923 | ret = count; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2924 | return ret; |
| 2925 | } |
| 2926 | |
| 2927 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, |
| 2928 | loff_t *ppos, int nonblocking) |
| 2929 | { |
| 2930 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); |
| 2931 | } |
| 2932 | EXPORT_SYMBOL_GPL(vb2_read); |
| 2933 | |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 2934 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2935 | loff_t *ppos, int nonblocking) |
| 2936 | { |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 2937 | return __vb2_perform_fileio(q, (char __user *) data, count, |
| 2938 | ppos, nonblocking, 0); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2939 | } |
| 2940 | EXPORT_SYMBOL_GPL(vb2_write); |
| 2941 | |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 2942 | |
| 2943 | /* |
| 2944 | * The following functions are not part of the vb2 core API, but are helper |
| 2945 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations |
| 2946 | * and struct vb2_ops. |
| 2947 | * They contain boilerplate code that most if not all drivers have to do |
| 2948 | * and so they simplify the driver code. |
| 2949 | */ |
| 2950 | |
| 2951 | /* The queue is busy if there is a owner and you are not that owner. */ |
| 2952 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) |
| 2953 | { |
| 2954 | return vdev->queue->owner && vdev->queue->owner != file->private_data; |
| 2955 | } |
| 2956 | |
| 2957 | /* vb2 ioctl helpers */ |
| 2958 | |
| 2959 | int vb2_ioctl_reqbufs(struct file *file, void *priv, |
| 2960 | struct v4l2_requestbuffers *p) |
| 2961 | { |
| 2962 | struct video_device *vdev = video_devdata(file); |
| 2963 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); |
| 2964 | |
| 2965 | if (res) |
| 2966 | return res; |
| 2967 | if (vb2_queue_is_busy(vdev, file)) |
| 2968 | return -EBUSY; |
| 2969 | res = __reqbufs(vdev->queue, p); |
| 2970 | /* If count == 0, then the owner has released all buffers and he |
| 2971 | is no longer owner of the queue. Otherwise we have a new owner. */ |
| 2972 | if (res == 0) |
| 2973 | vdev->queue->owner = p->count ? file->private_data : NULL; |
| 2974 | return res; |
| 2975 | } |
| 2976 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); |
| 2977 | |
| 2978 | int vb2_ioctl_create_bufs(struct file *file, void *priv, |
| 2979 | struct v4l2_create_buffers *p) |
| 2980 | { |
| 2981 | struct video_device *vdev = video_devdata(file); |
| 2982 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); |
| 2983 | |
| 2984 | p->index = vdev->queue->num_buffers; |
| 2985 | /* If count == 0, then just check if memory and type are valid. |
| 2986 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ |
| 2987 | if (p->count == 0) |
| 2988 | return res != -EBUSY ? res : 0; |
| 2989 | if (res) |
| 2990 | return res; |
| 2991 | if (vb2_queue_is_busy(vdev, file)) |
| 2992 | return -EBUSY; |
| 2993 | res = __create_bufs(vdev->queue, p); |
| 2994 | if (res == 0) |
| 2995 | vdev->queue->owner = file->private_data; |
| 2996 | return res; |
| 2997 | } |
| 2998 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); |
| 2999 | |
| 3000 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, |
| 3001 | struct v4l2_buffer *p) |
| 3002 | { |
| 3003 | struct video_device *vdev = video_devdata(file); |
| 3004 | |
| 3005 | if (vb2_queue_is_busy(vdev, file)) |
| 3006 | return -EBUSY; |
| 3007 | return vb2_prepare_buf(vdev->queue, p); |
| 3008 | } |
| 3009 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); |
| 3010 | |
| 3011 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 3012 | { |
| 3013 | struct video_device *vdev = video_devdata(file); |
| 3014 | |
| 3015 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ |
| 3016 | return vb2_querybuf(vdev->queue, p); |
| 3017 | } |
| 3018 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); |
| 3019 | |
| 3020 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 3021 | { |
| 3022 | struct video_device *vdev = video_devdata(file); |
| 3023 | |
| 3024 | if (vb2_queue_is_busy(vdev, file)) |
| 3025 | return -EBUSY; |
| 3026 | return vb2_qbuf(vdev->queue, p); |
| 3027 | } |
| 3028 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); |
| 3029 | |
| 3030 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 3031 | { |
| 3032 | struct video_device *vdev = video_devdata(file); |
| 3033 | |
| 3034 | if (vb2_queue_is_busy(vdev, file)) |
| 3035 | return -EBUSY; |
| 3036 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); |
| 3037 | } |
| 3038 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); |
| 3039 | |
| 3040 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) |
| 3041 | { |
| 3042 | struct video_device *vdev = video_devdata(file); |
| 3043 | |
| 3044 | if (vb2_queue_is_busy(vdev, file)) |
| 3045 | return -EBUSY; |
| 3046 | return vb2_streamon(vdev->queue, i); |
| 3047 | } |
| 3048 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); |
| 3049 | |
| 3050 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) |
| 3051 | { |
| 3052 | struct video_device *vdev = video_devdata(file); |
| 3053 | |
| 3054 | if (vb2_queue_is_busy(vdev, file)) |
| 3055 | return -EBUSY; |
| 3056 | return vb2_streamoff(vdev->queue, i); |
| 3057 | } |
| 3058 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); |
| 3059 | |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 3060 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
| 3061 | { |
| 3062 | struct video_device *vdev = video_devdata(file); |
| 3063 | |
| 3064 | if (vb2_queue_is_busy(vdev, file)) |
| 3065 | return -EBUSY; |
| 3066 | return vb2_expbuf(vdev->queue, p); |
| 3067 | } |
| 3068 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); |
| 3069 | |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3070 | /* v4l2_file_operations helpers */ |
| 3071 | |
| 3072 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) |
| 3073 | { |
| 3074 | struct video_device *vdev = video_devdata(file); |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3075 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 3076 | int err; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3077 | |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3078 | if (lock && mutex_lock_interruptible(lock)) |
| 3079 | return -ERESTARTSYS; |
| 3080 | err = vb2_mmap(vdev->queue, vma); |
| 3081 | if (lock) |
| 3082 | mutex_unlock(lock); |
| 3083 | return err; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3084 | } |
| 3085 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); |
| 3086 | |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3087 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3088 | { |
| 3089 | struct video_device *vdev = video_devdata(file); |
| 3090 | |
| 3091 | if (file->private_data == vdev->queue->owner) { |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3092 | if (lock) |
| 3093 | mutex_lock(lock); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3094 | vb2_queue_release(vdev->queue); |
| 3095 | vdev->queue->owner = NULL; |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3096 | if (lock) |
| 3097 | mutex_unlock(lock); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3098 | } |
| 3099 | return v4l2_fh_release(file); |
| 3100 | } |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3101 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
| 3102 | |
| 3103 | int vb2_fop_release(struct file *file) |
| 3104 | { |
| 3105 | struct video_device *vdev = video_devdata(file); |
| 3106 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 3107 | |
| 3108 | return _vb2_fop_release(file, lock); |
| 3109 | } |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3110 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
| 3111 | |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 3112 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3113 | size_t count, loff_t *ppos) |
| 3114 | { |
| 3115 | struct video_device *vdev = video_devdata(file); |
| 3116 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3117 | int err = -EBUSY; |
| 3118 | |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3119 | if (lock && mutex_lock_interruptible(lock)) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3120 | return -ERESTARTSYS; |
| 3121 | if (vb2_queue_is_busy(vdev, file)) |
| 3122 | goto exit; |
| 3123 | err = vb2_write(vdev->queue, buf, count, ppos, |
| 3124 | file->f_flags & O_NONBLOCK); |
Hans Verkuil | 8c82c75 | 2012-09-07 12:50:02 -0300 | [diff] [blame] | 3125 | if (vdev->queue->fileio) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3126 | vdev->queue->owner = file->private_data; |
| 3127 | exit: |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3128 | if (lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3129 | mutex_unlock(lock); |
| 3130 | return err; |
| 3131 | } |
| 3132 | EXPORT_SYMBOL_GPL(vb2_fop_write); |
| 3133 | |
| 3134 | ssize_t vb2_fop_read(struct file *file, char __user *buf, |
| 3135 | size_t count, loff_t *ppos) |
| 3136 | { |
| 3137 | struct video_device *vdev = video_devdata(file); |
| 3138 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3139 | int err = -EBUSY; |
| 3140 | |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3141 | if (lock && mutex_lock_interruptible(lock)) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3142 | return -ERESTARTSYS; |
| 3143 | if (vb2_queue_is_busy(vdev, file)) |
| 3144 | goto exit; |
| 3145 | err = vb2_read(vdev->queue, buf, count, ppos, |
| 3146 | file->f_flags & O_NONBLOCK); |
Hans Verkuil | 8c82c75 | 2012-09-07 12:50:02 -0300 | [diff] [blame] | 3147 | if (vdev->queue->fileio) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3148 | vdev->queue->owner = file->private_data; |
| 3149 | exit: |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3150 | if (lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3151 | mutex_unlock(lock); |
| 3152 | return err; |
| 3153 | } |
| 3154 | EXPORT_SYMBOL_GPL(vb2_fop_read); |
| 3155 | |
| 3156 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) |
| 3157 | { |
| 3158 | struct video_device *vdev = video_devdata(file); |
| 3159 | struct vb2_queue *q = vdev->queue; |
| 3160 | struct mutex *lock = q->lock ? q->lock : vdev->lock; |
| 3161 | unsigned long req_events = poll_requested_events(wait); |
| 3162 | unsigned res; |
| 3163 | void *fileio; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3164 | bool must_lock = false; |
| 3165 | |
| 3166 | /* Try to be smart: only lock if polling might start fileio, |
| 3167 | otherwise locking will only introduce unwanted delays. */ |
| 3168 | if (q->num_buffers == 0 && q->fileio == NULL) { |
| 3169 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
| 3170 | (req_events & (POLLIN | POLLRDNORM))) |
| 3171 | must_lock = true; |
| 3172 | else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
| 3173 | (req_events & (POLLOUT | POLLWRNORM))) |
| 3174 | must_lock = true; |
| 3175 | } |
| 3176 | |
| 3177 | /* If locking is needed, but this helper doesn't know how, then you |
| 3178 | shouldn't be using this helper but you should write your own. */ |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3179 | WARN_ON(must_lock && !lock); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3180 | |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3181 | if (must_lock && lock && mutex_lock_interruptible(lock)) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3182 | return POLLERR; |
| 3183 | |
| 3184 | fileio = q->fileio; |
| 3185 | |
| 3186 | res = vb2_poll(vdev->queue, file, wait); |
| 3187 | |
| 3188 | /* If fileio was started, then we have a new queue owner. */ |
| 3189 | if (must_lock && !fileio && q->fileio) |
| 3190 | q->owner = file->private_data; |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3191 | if (must_lock && lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3192 | mutex_unlock(lock); |
| 3193 | return res; |
| 3194 | } |
| 3195 | EXPORT_SYMBOL_GPL(vb2_fop_poll); |
| 3196 | |
| 3197 | #ifndef CONFIG_MMU |
| 3198 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, |
| 3199 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 3200 | { |
| 3201 | struct video_device *vdev = video_devdata(file); |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3202 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 3203 | int ret; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3204 | |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3205 | if (lock && mutex_lock_interruptible(lock)) |
| 3206 | return -ERESTARTSYS; |
| 3207 | ret = vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); |
| 3208 | if (lock) |
| 3209 | mutex_unlock(lock); |
| 3210 | return ret; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3211 | } |
| 3212 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); |
| 3213 | #endif |
| 3214 | |
| 3215 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ |
| 3216 | |
| 3217 | void vb2_ops_wait_prepare(struct vb2_queue *vq) |
| 3218 | { |
| 3219 | mutex_unlock(vq->lock); |
| 3220 | } |
| 3221 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); |
| 3222 | |
| 3223 | void vb2_ops_wait_finish(struct vb2_queue *vq) |
| 3224 | { |
| 3225 | mutex_lock(vq->lock); |
| 3226 | } |
| 3227 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); |
| 3228 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 3229 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
Pawel Osciak | 9507208 | 2011-03-13 15:23:32 -0300 | [diff] [blame] | 3230 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 3231 | MODULE_LICENSE("GPL"); |