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 | * |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 9 | * The vb2_thread implementation was based on code from videobuf-dvb.c: |
| 10 | * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] |
| 11 | * |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/poll.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/sched.h> |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 24 | #include <linux/freezer.h> |
| 25 | #include <linux/kthread.h> |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 26 | |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 27 | #include <media/v4l2-dev.h> |
| 28 | #include <media/v4l2-fh.h> |
| 29 | #include <media/v4l2-event.h> |
Hans Verkuil | ebd7c50 | 2014-04-11 04:36:57 -0300 | [diff] [blame] | 30 | #include <media/v4l2-common.h> |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 31 | #include <media/videobuf2-core.h> |
| 32 | |
| 33 | static int debug; |
| 34 | module_param(debug, int, 0644); |
| 35 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 36 | #define dprintk(level, fmt, arg...) \ |
| 37 | do { \ |
| 38 | if (debug >= level) \ |
| 39 | pr_debug("vb2: %s: " fmt, __func__, ## arg); \ |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 40 | } while (0) |
| 41 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 42 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 43 | |
| 44 | /* |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 45 | * If advanced debugging is on, then count how often each op is called |
| 46 | * successfully, which can either be per-buffer or per-queue. |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 47 | * |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 48 | * This makes it easy to check that the 'init' and 'cleanup' |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 49 | * (and variations thereof) stay balanced. |
| 50 | */ |
| 51 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 52 | #define log_memop(vb, op) \ |
| 53 | dprintk(2, "call_memop(%p, %d, %s)%s\n", \ |
| 54 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ |
| 55 | (vb)->vb2_queue->mem_ops->op ? "" : " (nop)") |
| 56 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 57 | #define call_memop(vb, op, args...) \ |
| 58 | ({ \ |
| 59 | struct vb2_queue *_q = (vb)->vb2_queue; \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 60 | int err; \ |
| 61 | \ |
| 62 | log_memop(vb, op); \ |
| 63 | err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \ |
| 64 | if (!err) \ |
| 65 | (vb)->cnt_mem_ ## op++; \ |
| 66 | err; \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 67 | }) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 68 | |
| 69 | #define call_ptr_memop(vb, op, args...) \ |
| 70 | ({ \ |
| 71 | struct vb2_queue *_q = (vb)->vb2_queue; \ |
| 72 | void *ptr; \ |
| 73 | \ |
| 74 | log_memop(vb, op); \ |
| 75 | ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \ |
| 76 | if (!IS_ERR_OR_NULL(ptr)) \ |
| 77 | (vb)->cnt_mem_ ## op++; \ |
| 78 | ptr; \ |
| 79 | }) |
| 80 | |
| 81 | #define call_void_memop(vb, op, args...) \ |
| 82 | ({ \ |
| 83 | struct vb2_queue *_q = (vb)->vb2_queue; \ |
| 84 | \ |
| 85 | log_memop(vb, op); \ |
| 86 | if (_q->mem_ops->op) \ |
| 87 | _q->mem_ops->op(args); \ |
| 88 | (vb)->cnt_mem_ ## op++; \ |
| 89 | }) |
| 90 | |
| 91 | #define log_qop(q, op) \ |
| 92 | dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \ |
| 93 | (q)->ops->op ? "" : " (nop)") |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 94 | |
| 95 | #define call_qop(q, op, args...) \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 96 | ({ \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 97 | int err; \ |
| 98 | \ |
| 99 | log_qop(q, op); \ |
| 100 | err = (q)->ops->op ? (q)->ops->op(args) : 0; \ |
| 101 | if (!err) \ |
| 102 | (q)->cnt_ ## op++; \ |
| 103 | err; \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 104 | }) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 105 | |
| 106 | #define call_void_qop(q, op, args...) \ |
| 107 | ({ \ |
| 108 | log_qop(q, op); \ |
| 109 | if ((q)->ops->op) \ |
| 110 | (q)->ops->op(args); \ |
| 111 | (q)->cnt_ ## op++; \ |
| 112 | }) |
| 113 | |
| 114 | #define log_vb_qop(vb, op, args...) \ |
| 115 | dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \ |
| 116 | (vb)->vb2_queue, (vb)->v4l2_buf.index, #op, \ |
| 117 | (vb)->vb2_queue->ops->op ? "" : " (nop)") |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 118 | |
| 119 | #define call_vb_qop(vb, op, args...) \ |
| 120 | ({ \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 121 | int err; \ |
| 122 | \ |
| 123 | log_vb_qop(vb, op); \ |
| 124 | err = (vb)->vb2_queue->ops->op ? \ |
| 125 | (vb)->vb2_queue->ops->op(args) : 0; \ |
| 126 | if (!err) \ |
| 127 | (vb)->cnt_ ## op++; \ |
| 128 | err; \ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 129 | }) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 130 | |
| 131 | #define call_void_vb_qop(vb, op, args...) \ |
| 132 | ({ \ |
| 133 | log_vb_qop(vb, op); \ |
| 134 | if ((vb)->vb2_queue->ops->op) \ |
| 135 | (vb)->vb2_queue->ops->op(args); \ |
| 136 | (vb)->cnt_ ## op++; \ |
| 137 | }) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 138 | |
| 139 | #else |
| 140 | |
| 141 | #define call_memop(vb, op, args...) \ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 142 | ((vb)->vb2_queue->mem_ops->op ? \ |
| 143 | (vb)->vb2_queue->mem_ops->op(args) : 0) |
| 144 | |
| 145 | #define call_ptr_memop(vb, op, args...) \ |
| 146 | ((vb)->vb2_queue->mem_ops->op ? \ |
| 147 | (vb)->vb2_queue->mem_ops->op(args) : NULL) |
| 148 | |
| 149 | #define call_void_memop(vb, op, args...) \ |
| 150 | do { \ |
| 151 | if ((vb)->vb2_queue->mem_ops->op) \ |
| 152 | (vb)->vb2_queue->mem_ops->op(args); \ |
| 153 | } while (0) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 154 | |
| 155 | #define call_qop(q, op, args...) \ |
| 156 | ((q)->ops->op ? (q)->ops->op(args) : 0) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 157 | |
| 158 | #define call_void_qop(q, op, args...) \ |
| 159 | do { \ |
| 160 | if ((q)->ops->op) \ |
| 161 | (q)->ops->op(args); \ |
| 162 | } while (0) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 163 | |
| 164 | #define call_vb_qop(vb, op, args...) \ |
| 165 | ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 166 | |
| 167 | #define call_void_vb_qop(vb, op, args...) \ |
| 168 | do { \ |
| 169 | if ((vb)->vb2_queue->ops->op) \ |
| 170 | (vb)->vb2_queue->ops->op(args); \ |
| 171 | } while (0) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 172 | |
| 173 | #endif |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 174 | |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 175 | /* Flags that are set by the vb2 core */ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 176 | #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] | 177 | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 178 | V4L2_BUF_FLAG_PREPARED | \ |
| 179 | V4L2_BUF_FLAG_TIMESTAMP_MASK) |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 180 | /* Output buffer flags that should be passed on to the driver */ |
| 181 | #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \ |
| 182 | V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) |
Marek Szyprowski | ea42c8e | 2011-04-12 10:14:13 -0300 | [diff] [blame] | 183 | |
Hans Verkuil | fb64dca | 2014-02-28 12:49:18 -0300 | [diff] [blame] | 184 | static void __vb2_queue_cancel(struct vb2_queue *q); |
| 185 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 186 | /** |
| 187 | * __vb2_buf_mem_alloc() - allocate video memory for the given buffer |
| 188 | */ |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 189 | static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 190 | { |
| 191 | struct vb2_queue *q = vb->vb2_queue; |
| 192 | void *mem_priv; |
| 193 | int plane; |
| 194 | |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 195 | /* |
| 196 | * Allocate memory for all planes in this buffer |
| 197 | * NOTE: mmapped areas should be page aligned |
| 198 | */ |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 199 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 200 | unsigned long size = PAGE_ALIGN(q->plane_sizes[plane]); |
| 201 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 202 | mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane], |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 203 | size, q->gfp_flags); |
Guennadi Liakhovetski | 62a7943 | 2011-03-22 09:24:58 -0300 | [diff] [blame] | 204 | if (IS_ERR_OR_NULL(mem_priv)) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 205 | goto free; |
| 206 | |
| 207 | /* Associate allocator private data with this plane */ |
| 208 | vb->planes[plane].mem_priv = mem_priv; |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 209 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | free: |
| 214 | /* Free already allocated memory if one of the allocations failed */ |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 215 | for (; plane > 0; --plane) { |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 216 | call_void_memop(vb, put, vb->planes[plane - 1].mem_priv); |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 217 | vb->planes[plane - 1].mem_priv = NULL; |
| 218 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 219 | |
| 220 | return -ENOMEM; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * __vb2_buf_mem_free() - free memory of the given buffer |
| 225 | */ |
| 226 | static void __vb2_buf_mem_free(struct vb2_buffer *vb) |
| 227 | { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 228 | unsigned int plane; |
| 229 | |
| 230 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 231 | call_void_memop(vb, put, vb->planes[plane].mem_priv); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 232 | vb->planes[plane].mem_priv = NULL; |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 233 | dprintk(3, "freed plane %d of buffer %d\n", plane, |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 234 | vb->v4l2_buf.index); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 235 | } |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * __vb2_buf_userptr_put() - release userspace memory associated with |
| 240 | * a USERPTR buffer |
| 241 | */ |
| 242 | static void __vb2_buf_userptr_put(struct vb2_buffer *vb) |
| 243 | { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 244 | unsigned int plane; |
| 245 | |
| 246 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 247 | if (vb->planes[plane].mem_priv) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 248 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 249 | vb->planes[plane].mem_priv = NULL; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 250 | } |
| 251 | } |
| 252 | |
| 253 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 254 | * __vb2_plane_dmabuf_put() - release memory associated with |
| 255 | * a DMABUF shared plane |
| 256 | */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 257 | 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] | 258 | { |
| 259 | if (!p->mem_priv) |
| 260 | return; |
| 261 | |
| 262 | if (p->dbuf_mapped) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 263 | call_void_memop(vb, unmap_dmabuf, p->mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 264 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 265 | call_void_memop(vb, detach_dmabuf, p->mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 266 | dma_buf_put(p->dbuf); |
| 267 | memset(p, 0, sizeof(*p)); |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * __vb2_buf_dmabuf_put() - release memory associated with |
| 272 | * a DMABUF shared buffer |
| 273 | */ |
| 274 | static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) |
| 275 | { |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 276 | unsigned int plane; |
| 277 | |
| 278 | for (plane = 0; plane < vb->num_planes; ++plane) |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 279 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | /** |
Hans Verkuil | a5e3d74 | 2013-12-04 15:14:05 +0100 | [diff] [blame] | 283 | * __setup_lengths() - setup initial lengths for every plane in |
| 284 | * every buffer on the queue |
| 285 | */ |
| 286 | static void __setup_lengths(struct vb2_queue *q, unsigned int n) |
| 287 | { |
| 288 | unsigned int buffer, plane; |
| 289 | struct vb2_buffer *vb; |
| 290 | |
| 291 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { |
| 292 | vb = q->bufs[buffer]; |
| 293 | if (!vb) |
| 294 | continue; |
| 295 | |
| 296 | for (plane = 0; plane < vb->num_planes; ++plane) |
| 297 | vb->v4l2_planes[plane].length = q->plane_sizes[plane]; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 302 | * __setup_offsets() - setup unique offsets ("cookies") for every plane in |
| 303 | * every buffer on the queue |
| 304 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 305 | static void __setup_offsets(struct vb2_queue *q, unsigned int n) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 306 | { |
| 307 | unsigned int buffer, plane; |
| 308 | struct vb2_buffer *vb; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 309 | unsigned long off; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 310 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 311 | if (q->num_buffers) { |
| 312 | struct v4l2_plane *p; |
| 313 | vb = q->bufs[q->num_buffers - 1]; |
| 314 | p = &vb->v4l2_planes[vb->num_planes - 1]; |
| 315 | off = PAGE_ALIGN(p->m.mem_offset + p->length); |
| 316 | } else { |
| 317 | off = 0; |
| 318 | } |
| 319 | |
| 320 | for (buffer = q->num_buffers; buffer < q->num_buffers + n; ++buffer) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 321 | vb = q->bufs[buffer]; |
| 322 | if (!vb) |
| 323 | continue; |
| 324 | |
| 325 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 326 | vb->v4l2_planes[plane].m.mem_offset = off; |
| 327 | |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 328 | dprintk(3, "buffer %d, plane %d offset 0x%08lx\n", |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 329 | buffer, plane, off); |
| 330 | |
| 331 | off += vb->v4l2_planes[plane].length; |
| 332 | off = PAGE_ALIGN(off); |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type) |
| 339 | * video buffer memory for all buffers/planes on the queue and initializes the |
| 340 | * queue |
| 341 | * |
| 342 | * Returns the number of buffers successfully allocated. |
| 343 | */ |
| 344 | 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] | 345 | unsigned int num_buffers, unsigned int num_planes) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 346 | { |
| 347 | unsigned int buffer; |
| 348 | struct vb2_buffer *vb; |
| 349 | int ret; |
| 350 | |
| 351 | for (buffer = 0; buffer < num_buffers; ++buffer) { |
| 352 | /* Allocate videobuf buffer structures */ |
| 353 | vb = kzalloc(q->buf_struct_size, GFP_KERNEL); |
| 354 | if (!vb) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 355 | dprintk(1, "memory alloc for buffer struct failed\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 356 | break; |
| 357 | } |
| 358 | |
| 359 | /* Length stores number of planes for multiplanar buffers */ |
| 360 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) |
| 361 | vb->v4l2_buf.length = num_planes; |
| 362 | |
| 363 | vb->state = VB2_BUF_STATE_DEQUEUED; |
| 364 | vb->vb2_queue = q; |
| 365 | vb->num_planes = num_planes; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 366 | vb->v4l2_buf.index = q->num_buffers + buffer; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 367 | vb->v4l2_buf.type = q->type; |
| 368 | vb->v4l2_buf.memory = memory; |
| 369 | |
| 370 | /* Allocate video buffer memory for the MMAP type */ |
| 371 | if (memory == V4L2_MEMORY_MMAP) { |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 372 | ret = __vb2_buf_mem_alloc(vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 373 | if (ret) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 374 | dprintk(1, "failed allocating memory for " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 375 | "buffer %d\n", buffer); |
| 376 | kfree(vb); |
| 377 | break; |
| 378 | } |
| 379 | /* |
| 380 | * Call the driver-provided buffer initialization |
| 381 | * callback, if given. An error in initialization |
| 382 | * results in queue setup failure. |
| 383 | */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 384 | ret = call_vb_qop(vb, buf_init, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 385 | if (ret) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 386 | dprintk(1, "buffer %d %p initialization" |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 387 | " failed\n", buffer, vb); |
| 388 | __vb2_buf_mem_free(vb); |
| 389 | kfree(vb); |
| 390 | break; |
| 391 | } |
| 392 | } |
| 393 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 394 | q->bufs[q->num_buffers + buffer] = vb; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 395 | } |
| 396 | |
Hans Verkuil | a5e3d74 | 2013-12-04 15:14:05 +0100 | [diff] [blame] | 397 | __setup_lengths(q, buffer); |
Philipp Zabel | dc77523 | 2013-09-19 04:37:29 -0300 | [diff] [blame] | 398 | if (memory == V4L2_MEMORY_MMAP) |
| 399 | __setup_offsets(q, buffer); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 400 | |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 401 | dprintk(1, "allocated %d buffers, %d plane(s) each\n", |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 402 | buffer, num_planes); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 403 | |
| 404 | return buffer; |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * __vb2_free_mem() - release all video buffer memory for a given queue |
| 409 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 410 | static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 411 | { |
| 412 | unsigned int buffer; |
| 413 | struct vb2_buffer *vb; |
| 414 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 415 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 416 | ++buffer) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 417 | vb = q->bufs[buffer]; |
| 418 | if (!vb) |
| 419 | continue; |
| 420 | |
| 421 | /* Free MMAP buffers or release USERPTR buffers */ |
| 422 | if (q->memory == V4L2_MEMORY_MMAP) |
| 423 | __vb2_buf_mem_free(vb); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 424 | else if (q->memory == V4L2_MEMORY_DMABUF) |
| 425 | __vb2_buf_dmabuf_put(vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 426 | else |
| 427 | __vb2_buf_userptr_put(vb); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /** |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 432 | * __vb2_queue_free() - free buffers at the end of the queue - video memory and |
| 433 | * related information, if no buffers are left return the queue to an |
| 434 | * 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] | 435 | */ |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 436 | static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 437 | { |
| 438 | unsigned int buffer; |
| 439 | |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 440 | /* |
| 441 | * Sanity check: when preparing a buffer the queue lock is released for |
| 442 | * a short while (see __buf_prepare for the details), which would allow |
| 443 | * a race with a reqbufs which can call this function. Removing the |
| 444 | * buffers from underneath __buf_prepare is obviously a bad idea, so we |
| 445 | * check if any of the buffers is in the state PREPARING, and if so we |
| 446 | * just return -EAGAIN. |
| 447 | */ |
| 448 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 449 | ++buffer) { |
| 450 | if (q->bufs[buffer] == NULL) |
| 451 | continue; |
| 452 | if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 453 | dprintk(1, "preparing buffers, cannot free\n"); |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 454 | return -EAGAIN; |
| 455 | } |
| 456 | } |
| 457 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 458 | /* Call driver-provided cleanup function for each buffer, if provided */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 459 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 460 | ++buffer) { |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 461 | struct vb2_buffer *vb = q->bufs[buffer]; |
| 462 | |
| 463 | if (vb && vb->planes[0].mem_priv) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 464 | call_void_vb_qop(vb, buf_cleanup, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | /* Release video buffer memory */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 468 | __vb2_free_mem(q, buffers); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 469 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 470 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 471 | /* |
| 472 | * Check that all the calls were balances during the life-time of this |
| 473 | * queue. If not (or if the debug level is 1 or up), then dump the |
| 474 | * counters to the kernel log. |
| 475 | */ |
| 476 | if (q->num_buffers) { |
| 477 | bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming || |
| 478 | q->cnt_wait_prepare != q->cnt_wait_finish; |
| 479 | |
| 480 | if (unbalanced || debug) { |
| 481 | pr_info("vb2: counters for queue %p:%s\n", q, |
| 482 | unbalanced ? " UNBALANCED!" : ""); |
| 483 | pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", |
| 484 | q->cnt_queue_setup, q->cnt_start_streaming, |
| 485 | q->cnt_stop_streaming); |
| 486 | pr_info("vb2: wait_prepare: %u wait_finish: %u\n", |
| 487 | q->cnt_wait_prepare, q->cnt_wait_finish); |
| 488 | } |
| 489 | q->cnt_queue_setup = 0; |
| 490 | q->cnt_wait_prepare = 0; |
| 491 | q->cnt_wait_finish = 0; |
| 492 | q->cnt_start_streaming = 0; |
| 493 | q->cnt_stop_streaming = 0; |
| 494 | } |
| 495 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { |
| 496 | struct vb2_buffer *vb = q->bufs[buffer]; |
| 497 | bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || |
| 498 | vb->cnt_mem_prepare != vb->cnt_mem_finish || |
| 499 | vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || |
| 500 | vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || |
| 501 | vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || |
| 502 | vb->cnt_buf_queue != vb->cnt_buf_done || |
| 503 | vb->cnt_buf_prepare != vb->cnt_buf_finish || |
| 504 | vb->cnt_buf_init != vb->cnt_buf_cleanup; |
| 505 | |
| 506 | if (unbalanced || debug) { |
| 507 | pr_info("vb2: counters for queue %p, buffer %d:%s\n", |
| 508 | q, buffer, unbalanced ? " UNBALANCED!" : ""); |
| 509 | pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", |
| 510 | vb->cnt_buf_init, vb->cnt_buf_cleanup, |
| 511 | vb->cnt_buf_prepare, vb->cnt_buf_finish); |
| 512 | pr_info("vb2: buf_queue: %u buf_done: %u\n", |
| 513 | vb->cnt_buf_queue, vb->cnt_buf_done); |
| 514 | pr_info("vb2: alloc: %u put: %u prepare: %u finish: %u mmap: %u\n", |
| 515 | vb->cnt_mem_alloc, vb->cnt_mem_put, |
| 516 | vb->cnt_mem_prepare, vb->cnt_mem_finish, |
| 517 | vb->cnt_mem_mmap); |
| 518 | pr_info("vb2: get_userptr: %u put_userptr: %u\n", |
| 519 | vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); |
| 520 | pr_info("vb2: attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n", |
| 521 | vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf, |
| 522 | vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf); |
| 523 | pr_info("vb2: get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n", |
| 524 | vb->cnt_mem_get_dmabuf, |
| 525 | vb->cnt_mem_num_users, |
| 526 | vb->cnt_mem_vaddr, |
| 527 | vb->cnt_mem_cookie); |
| 528 | } |
| 529 | } |
| 530 | #endif |
| 531 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 532 | /* Free videobuf buffers */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 533 | for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; |
| 534 | ++buffer) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 535 | kfree(q->bufs[buffer]); |
| 536 | q->bufs[buffer] = NULL; |
| 537 | } |
| 538 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 539 | q->num_buffers -= buffers; |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 540 | if (!q->num_buffers) { |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 541 | q->memory = 0; |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 542 | INIT_LIST_HEAD(&q->queued_list); |
| 543 | } |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 544 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 545 | } |
| 546 | |
| 547 | /** |
| 548 | * __verify_planes_array() - verify that the planes array passed in struct |
| 549 | * v4l2_buffer from userspace can be safely used |
| 550 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 551 | 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] | 552 | { |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 553 | if (!V4L2_TYPE_IS_MULTIPLANAR(b->type)) |
| 554 | return 0; |
| 555 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 556 | /* Is memory for copying plane information present? */ |
| 557 | if (NULL == b->m.planes) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 558 | dprintk(1, "multi-planar buffer passed but " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 559 | "planes array not provided\n"); |
| 560 | return -EINVAL; |
| 561 | } |
| 562 | |
| 563 | if (b->length < vb->num_planes || b->length > VIDEO_MAX_PLANES) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 564 | dprintk(1, "incorrect planes array length, " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 565 | "expected %d, got %d\n", vb->num_planes, b->length); |
| 566 | return -EINVAL; |
| 567 | } |
| 568 | |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | /** |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 573 | * __verify_length() - Verify that the bytesused value for each plane fits in |
| 574 | * the plane length and that the data offset doesn't exceed the bytesused value. |
| 575 | */ |
| 576 | static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 577 | { |
| 578 | unsigned int length; |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 579 | unsigned int bytesused; |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 580 | unsigned int plane; |
| 581 | |
| 582 | if (!V4L2_TYPE_IS_OUTPUT(b->type)) |
| 583 | return 0; |
| 584 | |
| 585 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
| 586 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 587 | length = (b->memory == V4L2_MEMORY_USERPTR || |
| 588 | b->memory == V4L2_MEMORY_DMABUF) |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 589 | ? b->m.planes[plane].length |
| 590 | : vb->v4l2_planes[plane].length; |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 591 | bytesused = b->m.planes[plane].bytesused |
| 592 | ? b->m.planes[plane].bytesused : length; |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 593 | |
| 594 | if (b->m.planes[plane].bytesused > length) |
| 595 | return -EINVAL; |
Sylwester Nawrocki | 3c5c23c | 2013-08-26 11:47:09 -0300 | [diff] [blame] | 596 | |
| 597 | if (b->m.planes[plane].data_offset > 0 && |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 598 | b->m.planes[plane].data_offset >= bytesused) |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 599 | return -EINVAL; |
| 600 | } |
| 601 | } else { |
| 602 | length = (b->memory == V4L2_MEMORY_USERPTR) |
| 603 | ? b->length : vb->v4l2_planes[0].length; |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 604 | bytesused = b->bytesused ? b->bytesused : length; |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 605 | |
| 606 | if (b->bytesused > length) |
| 607 | return -EINVAL; |
| 608 | } |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | /** |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 614 | * __buffer_in_use() - return true if the buffer is in use and |
| 615 | * the queue cannot be freed (by the means of REQBUFS(0)) call |
| 616 | */ |
| 617 | static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb) |
| 618 | { |
| 619 | unsigned int plane; |
| 620 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Marek Szyprowski | 2c2dd6ac | 2011-10-12 13:09:53 -0300 | [diff] [blame] | 621 | void *mem_priv = vb->planes[plane].mem_priv; |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 622 | /* |
| 623 | * If num_users() has not been provided, call_memop |
| 624 | * will return 0, apparently nobody cares about this |
| 625 | * case anyway. If num_users() returns more than 1, |
| 626 | * we are not the only user of the plane's memory. |
| 627 | */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 628 | if (mem_priv && call_memop(vb, num_users, mem_priv) > 1) |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 629 | return true; |
| 630 | } |
| 631 | return false; |
| 632 | } |
| 633 | |
| 634 | /** |
| 635 | * __buffers_in_use() - return true if any buffers on the queue are in use and |
| 636 | * the queue cannot be freed (by the means of REQBUFS(0)) call |
| 637 | */ |
| 638 | static bool __buffers_in_use(struct vb2_queue *q) |
| 639 | { |
| 640 | unsigned int buffer; |
| 641 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { |
| 642 | if (__buffer_in_use(q, q->bufs[buffer])) |
| 643 | return true; |
| 644 | } |
| 645 | return false; |
| 646 | } |
| 647 | |
| 648 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 649 | * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be |
| 650 | * returned to userspace |
| 651 | */ |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 652 | 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] | 653 | { |
| 654 | struct vb2_queue *q = vb->vb2_queue; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 655 | |
Sakari Ailus | 2b719d7 | 2012-05-02 09:40:03 -0300 | [diff] [blame] | 656 | /* Copy back data such as timestamp, flags, etc. */ |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 657 | memcpy(b, &vb->v4l2_buf, offsetof(struct v4l2_buffer, m)); |
Sakari Ailus | 2b719d7 | 2012-05-02 09:40:03 -0300 | [diff] [blame] | 658 | b->reserved2 = vb->v4l2_buf.reserved2; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 659 | b->reserved = vb->v4l2_buf.reserved; |
| 660 | |
| 661 | if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 662 | /* |
| 663 | * Fill in plane-related data if userspace provided an array |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 664 | * for it. The caller has already verified memory and size. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 665 | */ |
Hans Verkuil | 3c0b606 | 2012-09-28 06:24:18 -0300 | [diff] [blame] | 666 | b->length = vb->num_planes; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 667 | memcpy(b->m.planes, vb->v4l2_planes, |
| 668 | b->length * sizeof(struct v4l2_plane)); |
| 669 | } else { |
| 670 | /* |
| 671 | * We use length and offset in v4l2_planes array even for |
| 672 | * single-planar buffers, but userspace does not. |
| 673 | */ |
| 674 | b->length = vb->v4l2_planes[0].length; |
| 675 | b->bytesused = vb->v4l2_planes[0].bytesused; |
| 676 | if (q->memory == V4L2_MEMORY_MMAP) |
| 677 | b->m.offset = vb->v4l2_planes[0].m.mem_offset; |
| 678 | else if (q->memory == V4L2_MEMORY_USERPTR) |
| 679 | b->m.userptr = vb->v4l2_planes[0].m.userptr; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 680 | else if (q->memory == V4L2_MEMORY_DMABUF) |
| 681 | b->m.fd = vb->v4l2_planes[0].m.fd; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 682 | } |
| 683 | |
Marek Szyprowski | ea42c8e | 2011-04-12 10:14:13 -0300 | [diff] [blame] | 684 | /* |
| 685 | * Clear any buffer state related flags. |
| 686 | */ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 687 | b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
Sakari Ailus | 7ce6fd8 | 2014-02-25 19:08:52 -0300 | [diff] [blame] | 688 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
| 689 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
| 690 | V4L2_BUF_FLAG_TIMESTAMP_COPY) { |
| 691 | /* |
| 692 | * For non-COPY timestamps, drop timestamp source bits |
| 693 | * and obtain the timestamp source from the queue. |
| 694 | */ |
| 695 | b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 696 | b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 697 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 698 | |
| 699 | switch (vb->state) { |
| 700 | case VB2_BUF_STATE_QUEUED: |
| 701 | case VB2_BUF_STATE_ACTIVE: |
| 702 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
| 703 | break; |
| 704 | case VB2_BUF_STATE_ERROR: |
| 705 | b->flags |= V4L2_BUF_FLAG_ERROR; |
| 706 | /* fall through */ |
| 707 | case VB2_BUF_STATE_DONE: |
| 708 | b->flags |= V4L2_BUF_FLAG_DONE; |
| 709 | break; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 710 | case VB2_BUF_STATE_PREPARED: |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 711 | b->flags |= V4L2_BUF_FLAG_PREPARED; |
| 712 | break; |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 713 | case VB2_BUF_STATE_PREPARING: |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 714 | case VB2_BUF_STATE_DEQUEUED: |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 715 | /* nothing */ |
| 716 | break; |
| 717 | } |
| 718 | |
Marek Szyprowski | 25a27d9 | 2011-08-24 06:49:35 -0300 | [diff] [blame] | 719 | if (__buffer_in_use(q, vb)) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 720 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | /** |
| 724 | * vb2_querybuf() - query video buffer information |
| 725 | * @q: videobuf queue |
| 726 | * @b: buffer struct passed from userspace to vidioc_querybuf handler |
| 727 | * in driver |
| 728 | * |
| 729 | * Should be called from vidioc_querybuf ioctl handler in driver. |
| 730 | * This function will verify the passed v4l2_buffer structure and fill the |
| 731 | * relevant information for the userspace. |
| 732 | * |
| 733 | * The return values from this function are intended to be directly returned |
| 734 | * from vidioc_querybuf handler in driver. |
| 735 | */ |
| 736 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 737 | { |
| 738 | struct vb2_buffer *vb; |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 739 | int ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 740 | |
| 741 | if (b->type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 742 | dprintk(1, "wrong buffer type\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 743 | return -EINVAL; |
| 744 | } |
| 745 | |
| 746 | if (b->index >= q->num_buffers) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 747 | dprintk(1, "buffer index out of range\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 748 | return -EINVAL; |
| 749 | } |
| 750 | vb = q->bufs[b->index]; |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 751 | ret = __verify_planes_array(vb, b); |
| 752 | if (!ret) |
| 753 | __fill_v4l2_buffer(vb, b); |
| 754 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 755 | } |
| 756 | EXPORT_SYMBOL(vb2_querybuf); |
| 757 | |
| 758 | /** |
| 759 | * __verify_userptr_ops() - verify that all memory operations required for |
| 760 | * USERPTR queue type have been provided |
| 761 | */ |
| 762 | static int __verify_userptr_ops(struct vb2_queue *q) |
| 763 | { |
| 764 | if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr || |
| 765 | !q->mem_ops->put_userptr) |
| 766 | return -EINVAL; |
| 767 | |
| 768 | return 0; |
| 769 | } |
| 770 | |
| 771 | /** |
| 772 | * __verify_mmap_ops() - verify that all memory operations required for |
| 773 | * MMAP queue type have been provided |
| 774 | */ |
| 775 | static int __verify_mmap_ops(struct vb2_queue *q) |
| 776 | { |
| 777 | if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc || |
| 778 | !q->mem_ops->put || !q->mem_ops->mmap) |
| 779 | return -EINVAL; |
| 780 | |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 785 | * __verify_dmabuf_ops() - verify that all memory operations required for |
| 786 | * DMABUF queue type have been provided |
| 787 | */ |
| 788 | static int __verify_dmabuf_ops(struct vb2_queue *q) |
| 789 | { |
| 790 | if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || |
| 791 | !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || |
| 792 | !q->mem_ops->unmap_dmabuf) |
| 793 | return -EINVAL; |
| 794 | |
| 795 | return 0; |
| 796 | } |
| 797 | |
| 798 | /** |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 799 | * __verify_memory_type() - Check whether the memory type and buffer type |
| 800 | * passed to a buffer operation are compatible with the queue. |
| 801 | */ |
| 802 | static int __verify_memory_type(struct vb2_queue *q, |
| 803 | enum v4l2_memory memory, enum v4l2_buf_type type) |
| 804 | { |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 805 | if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && |
| 806 | memory != V4L2_MEMORY_DMABUF) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 807 | dprintk(1, "unsupported memory type\n"); |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 808 | return -EINVAL; |
| 809 | } |
| 810 | |
| 811 | if (type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 812 | dprintk(1, "requested type is incorrect\n"); |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 813 | return -EINVAL; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * Make sure all the required memory ops for given memory type |
| 818 | * are available. |
| 819 | */ |
| 820 | if (memory == V4L2_MEMORY_MMAP && __verify_mmap_ops(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 821 | dprintk(1, "MMAP for current setup unsupported\n"); |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 822 | return -EINVAL; |
| 823 | } |
| 824 | |
| 825 | if (memory == V4L2_MEMORY_USERPTR && __verify_userptr_ops(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 826 | dprintk(1, "USERPTR for current setup unsupported\n"); |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 827 | return -EINVAL; |
| 828 | } |
| 829 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 830 | if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 831 | dprintk(1, "DMABUF for current setup unsupported\n"); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 832 | return -EINVAL; |
| 833 | } |
| 834 | |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 835 | /* |
| 836 | * Place the busy tests at the end: -EBUSY can be ignored when |
| 837 | * create_bufs is called with count == 0, but count == 0 should still |
| 838 | * do the memory and type validation. |
| 839 | */ |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 840 | if (vb2_fileio_is_active(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 841 | dprintk(1, "file io in progress\n"); |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 842 | return -EBUSY; |
| 843 | } |
| 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * __reqbufs() - Initiate streaming |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 849 | * @q: videobuf2 queue |
| 850 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver |
| 851 | * |
| 852 | * Should be called from vidioc_reqbufs ioctl handler of a driver. |
| 853 | * This function: |
| 854 | * 1) verifies streaming parameters passed from the userspace, |
| 855 | * 2) sets up the queue, |
| 856 | * 3) negotiates number of buffers and planes per buffer with the driver |
| 857 | * to be used during streaming, |
| 858 | * 4) allocates internal buffer structures (struct vb2_buffer), according to |
| 859 | * the agreed parameters, |
| 860 | * 5) for MMAP memory type, allocates actual video memory, using the |
| 861 | * memory handling/allocation routines provided during queue initialization |
| 862 | * |
| 863 | * If req->count is 0, all the memory will be freed instead. |
| 864 | * If the queue has been allocated previously (by a previous vb2_reqbufs) call |
| 865 | * and the queue is not busy, memory will be reallocated. |
| 866 | * |
| 867 | * The return values from this function are intended to be directly returned |
| 868 | * from vidioc_reqbufs handler in driver. |
| 869 | */ |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 870 | static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 871 | { |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 872 | unsigned int num_buffers, allocated_buffers, num_planes = 0; |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 873 | int ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 874 | |
| 875 | if (q->streaming) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 876 | dprintk(1, "streaming active\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 877 | return -EBUSY; |
| 878 | } |
| 879 | |
Marek Szyprowski | 29e3fbd | 2011-03-09 14:03:24 -0300 | [diff] [blame] | 880 | if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 881 | /* |
| 882 | * We already have buffers allocated, so first check if they |
| 883 | * are not in use and can be freed. |
| 884 | */ |
| 885 | if (q->memory == V4L2_MEMORY_MMAP && __buffers_in_use(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 886 | dprintk(1, "memory in use, cannot free\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 887 | return -EBUSY; |
| 888 | } |
| 889 | |
Hans Verkuil | fb64dca | 2014-02-28 12:49:18 -0300 | [diff] [blame] | 890 | /* |
| 891 | * Call queue_cancel to clean up any buffers in the PREPARED or |
| 892 | * QUEUED state which is possible if buffers were prepared or |
| 893 | * queued without ever calling STREAMON. |
| 894 | */ |
| 895 | __vb2_queue_cancel(q); |
Hans Verkuil | 63faabf | 2013-12-13 13:13:40 -0300 | [diff] [blame] | 896 | ret = __vb2_queue_free(q, q->num_buffers); |
| 897 | if (ret) |
| 898 | return ret; |
Marek Szyprowski | 29e3fbd | 2011-03-09 14:03:24 -0300 | [diff] [blame] | 899 | |
| 900 | /* |
| 901 | * In case of REQBUFS(0) return immediately without calling |
| 902 | * driver's queue_setup() callback and allocating resources. |
| 903 | */ |
| 904 | if (req->count == 0) |
| 905 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Make sure the requested values and current defaults are sane. |
| 910 | */ |
| 911 | num_buffers = min_t(unsigned int, req->count, VIDEO_MAX_FRAME); |
Philipp Zabel | 4cf743d | 2014-05-09 12:32:10 -0300 | [diff] [blame] | 912 | num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 913 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 914 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
Marek Szyprowski | 13b1409 | 2011-04-14 07:17:44 -0300 | [diff] [blame] | 915 | q->memory = req->memory; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 916 | |
| 917 | /* |
| 918 | * Ask the driver how many buffers and planes per buffer it requires. |
| 919 | * Driver also sets the size and allocator context for each plane. |
| 920 | */ |
Guennadi Liakhovetski | fc714e7 | 2011-08-24 10:30:21 -0300 | [diff] [blame] | 921 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, &num_planes, |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 922 | q->plane_sizes, q->alloc_ctx); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 923 | if (ret) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 924 | return ret; |
| 925 | |
| 926 | /* Finally, allocate buffers and video memory */ |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 927 | allocated_buffers = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes); |
| 928 | if (allocated_buffers == 0) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 929 | dprintk(1, "memory allocation failed\n"); |
Marek Szyprowski | 66072d4 | 2011-06-28 08:29:02 -0300 | [diff] [blame] | 930 | return -ENOMEM; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 931 | } |
| 932 | |
| 933 | /* |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 934 | * There is no point in continuing if we can't allocate the minimum |
| 935 | * number of buffers needed by this vb2_queue. |
| 936 | */ |
| 937 | if (allocated_buffers < q->min_buffers_needed) |
| 938 | ret = -ENOMEM; |
| 939 | |
| 940 | /* |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 941 | * Check if driver can handle the allocated number of buffers. |
| 942 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 943 | if (!ret && allocated_buffers < num_buffers) { |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 944 | num_buffers = allocated_buffers; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 945 | |
Guennadi Liakhovetski | fc714e7 | 2011-08-24 10:30:21 -0300 | [diff] [blame] | 946 | ret = call_qop(q, queue_setup, q, NULL, &num_buffers, |
| 947 | &num_planes, q->plane_sizes, q->alloc_ctx); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 948 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 949 | if (!ret && allocated_buffers < num_buffers) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 950 | ret = -ENOMEM; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 951 | |
| 952 | /* |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 953 | * Either the driver has accepted a smaller number of buffers, |
| 954 | * or .queue_setup() returned an error |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 955 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 956 | } |
| 957 | |
| 958 | q->num_buffers = allocated_buffers; |
| 959 | |
| 960 | if (ret < 0) { |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 961 | /* |
| 962 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' |
| 963 | * from q->num_buffers. |
| 964 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 965 | __vb2_queue_free(q, allocated_buffers); |
| 966 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 967 | } |
| 968 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 969 | /* |
| 970 | * Return the number of successfully allocated buffers |
| 971 | * to the userspace. |
| 972 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 973 | req->count = allocated_buffers; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 974 | |
| 975 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 976 | } |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 977 | |
| 978 | /** |
| 979 | * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and |
| 980 | * type values. |
| 981 | * @q: videobuf2 queue |
| 982 | * @req: struct passed from userspace to vidioc_reqbufs handler in driver |
| 983 | */ |
| 984 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
| 985 | { |
| 986 | int ret = __verify_memory_type(q, req->memory, req->type); |
| 987 | |
| 988 | return ret ? ret : __reqbufs(q, req); |
| 989 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 990 | EXPORT_SYMBOL_GPL(vb2_reqbufs); |
| 991 | |
| 992 | /** |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 993 | * __create_bufs() - Allocate buffers and any required auxiliary structs |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 994 | * @q: videobuf2 queue |
| 995 | * @create: creation parameters, passed from userspace to vidioc_create_bufs |
| 996 | * handler in driver |
| 997 | * |
| 998 | * Should be called from vidioc_create_bufs ioctl handler of a driver. |
| 999 | * This function: |
| 1000 | * 1) verifies parameter sanity |
| 1001 | * 2) calls the .queue_setup() queue operation |
| 1002 | * 3) performs any necessary memory allocations |
| 1003 | * |
| 1004 | * The return values from this function are intended to be directly returned |
| 1005 | * from vidioc_create_bufs handler in driver. |
| 1006 | */ |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1007 | 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] | 1008 | { |
| 1009 | unsigned int num_planes = 0, num_buffers, allocated_buffers; |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1010 | int ret; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1011 | |
| 1012 | if (q->num_buffers == VIDEO_MAX_FRAME) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1013 | dprintk(1, "maximum number of buffers already allocated\n"); |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1014 | return -ENOBUFS; |
| 1015 | } |
| 1016 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1017 | if (!q->num_buffers) { |
| 1018 | memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); |
| 1019 | memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); |
| 1020 | q->memory = create->memory; |
| 1021 | } |
| 1022 | |
| 1023 | num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); |
| 1024 | |
| 1025 | /* |
| 1026 | * Ask the driver, whether the requested number of buffers, planes per |
| 1027 | * buffer and their sizes are acceptable |
| 1028 | */ |
| 1029 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, |
| 1030 | &num_planes, q->plane_sizes, q->alloc_ctx); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1031 | if (ret) |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1032 | return ret; |
| 1033 | |
| 1034 | /* Finally, allocate buffers and video memory */ |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1035 | allocated_buffers = __vb2_queue_alloc(q, create->memory, num_buffers, |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1036 | num_planes); |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1037 | if (allocated_buffers == 0) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 1038 | dprintk(1, "memory allocation failed\n"); |
Hans Verkuil | f05393d2 | 2012-06-22 05:44:14 -0300 | [diff] [blame] | 1039 | return -ENOMEM; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1040 | } |
| 1041 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1042 | /* |
| 1043 | * Check if driver can handle the so far allocated number of buffers. |
| 1044 | */ |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1045 | if (allocated_buffers < num_buffers) { |
| 1046 | num_buffers = allocated_buffers; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1047 | |
| 1048 | /* |
| 1049 | * q->num_buffers contains the total number of buffers, that the |
| 1050 | * queue driver has set up |
| 1051 | */ |
| 1052 | ret = call_qop(q, queue_setup, q, &create->format, &num_buffers, |
| 1053 | &num_planes, q->plane_sizes, q->alloc_ctx); |
| 1054 | |
| 1055 | if (!ret && allocated_buffers < num_buffers) |
| 1056 | ret = -ENOMEM; |
| 1057 | |
| 1058 | /* |
| 1059 | * Either the driver has accepted a smaller number of buffers, |
| 1060 | * or .queue_setup() returned an error |
| 1061 | */ |
| 1062 | } |
| 1063 | |
| 1064 | q->num_buffers += allocated_buffers; |
| 1065 | |
| 1066 | if (ret < 0) { |
Hans Verkuil | a7afcac | 2014-02-24 13:41:20 -0300 | [diff] [blame] | 1067 | /* |
| 1068 | * Note: __vb2_queue_free() will subtract 'allocated_buffers' |
| 1069 | * from q->num_buffers. |
| 1070 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1071 | __vb2_queue_free(q, allocated_buffers); |
Hans Verkuil | f05393d2 | 2012-06-22 05:44:14 -0300 | [diff] [blame] | 1072 | return -ENOMEM; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * Return the number of successfully allocated buffers |
| 1077 | * to the userspace. |
| 1078 | */ |
| 1079 | create->count = allocated_buffers; |
| 1080 | |
| 1081 | return 0; |
| 1082 | } |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1083 | |
| 1084 | /** |
Nicolas THERY | 53aa3b1 | 2012-07-20 09:25:37 -0300 | [diff] [blame] | 1085 | * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the |
| 1086 | * memory and type values. |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1087 | * @q: videobuf2 queue |
| 1088 | * @create: creation parameters, passed from userspace to vidioc_create_bufs |
| 1089 | * handler in driver |
| 1090 | */ |
| 1091 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) |
| 1092 | { |
| 1093 | int ret = __verify_memory_type(q, create->memory, create->format.type); |
| 1094 | |
| 1095 | create->index = q->num_buffers; |
Hans Verkuil | f05393d2 | 2012-06-22 05:44:14 -0300 | [diff] [blame] | 1096 | if (create->count == 0) |
| 1097 | return ret != -EBUSY ? ret : 0; |
Hans Verkuil | 37d9ed9 | 2012-06-27 17:10:30 -0300 | [diff] [blame] | 1098 | return ret ? ret : __create_bufs(q, create); |
| 1099 | } |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1100 | EXPORT_SYMBOL_GPL(vb2_create_bufs); |
| 1101 | |
| 1102 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1103 | * vb2_plane_vaddr() - Return a kernel virtual address of a given plane |
| 1104 | * @vb: vb2_buffer to which the plane in question belongs to |
| 1105 | * @plane_no: plane number for which the address is to be returned |
| 1106 | * |
| 1107 | * This function returns a kernel virtual address of a given plane if |
| 1108 | * such a mapping exist, NULL otherwise. |
| 1109 | */ |
| 1110 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no) |
| 1111 | { |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1112 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1113 | return NULL; |
| 1114 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1115 | return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1116 | |
| 1117 | } |
| 1118 | EXPORT_SYMBOL_GPL(vb2_plane_vaddr); |
| 1119 | |
| 1120 | /** |
| 1121 | * vb2_plane_cookie() - Return allocator specific cookie for the given plane |
| 1122 | * @vb: vb2_buffer to which the plane in question belongs to |
| 1123 | * @plane_no: plane number for which the cookie is to be returned |
| 1124 | * |
| 1125 | * This function returns an allocator specific cookie for a given plane if |
| 1126 | * available, NULL otherwise. The allocator should provide some simple static |
| 1127 | * inline function, which would convert this cookie to the allocator specific |
| 1128 | * type that can be used directly by the driver to access the buffer. This can |
| 1129 | * be for example physical address, pointer to scatter list or IOMMU mapping. |
| 1130 | */ |
| 1131 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no) |
| 1132 | { |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1133 | if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1134 | return NULL; |
| 1135 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1136 | return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1137 | } |
| 1138 | EXPORT_SYMBOL_GPL(vb2_plane_cookie); |
| 1139 | |
| 1140 | /** |
| 1141 | * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished |
| 1142 | * @vb: vb2_buffer returned from the driver |
| 1143 | * @state: either VB2_BUF_STATE_DONE if the operation finished successfully |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1144 | * or VB2_BUF_STATE_ERROR if the operation finished with an error. |
| 1145 | * If start_streaming fails then it should return buffers with state |
| 1146 | * VB2_BUF_STATE_QUEUED to put them back into the queue. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1147 | * |
| 1148 | * This function should be called by the driver after a hardware operation on |
| 1149 | * a buffer is finished and the buffer may be returned to userspace. The driver |
| 1150 | * cannot use this buffer anymore until it is queued back to it by videobuf |
| 1151 | * by the means of buf_queue callback. Only buffers previously queued to the |
| 1152 | * driver by buf_queue can be passed to this function. |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1153 | * |
| 1154 | * While streaming a buffer can only be returned in state DONE or ERROR. |
| 1155 | * The start_streaming op can also return them in case the DMA engine cannot |
| 1156 | * be started for some reason. In that case the buffers should be returned with |
| 1157 | * state QUEUED. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1158 | */ |
| 1159 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) |
| 1160 | { |
| 1161 | struct vb2_queue *q = vb->vb2_queue; |
| 1162 | unsigned long flags; |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1163 | unsigned int plane; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1164 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1165 | if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE)) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1166 | return; |
| 1167 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1168 | if (!q->start_streaming_called) { |
| 1169 | if (WARN_ON(state != VB2_BUF_STATE_QUEUED)) |
| 1170 | state = VB2_BUF_STATE_QUEUED; |
Hans Verkuil | 57394b7 | 2014-02-24 15:52:04 -0300 | [diff] [blame] | 1171 | } else if (WARN_ON(state != VB2_BUF_STATE_DONE && |
| 1172 | state != VB2_BUF_STATE_ERROR)) { |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1173 | state = VB2_BUF_STATE_ERROR; |
| 1174 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1175 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 1176 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 1177 | /* |
| 1178 | * Although this is not a callback, it still does have to balance |
| 1179 | * with the buf_queue op. So update this counter manually. |
| 1180 | */ |
| 1181 | vb->cnt_buf_done++; |
| 1182 | #endif |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 1183 | dprintk(4, "done processing on buffer %d, state: %d\n", |
Tushar Behera | 9b6f5dc | 2012-11-12 04:01:29 -0300 | [diff] [blame] | 1184 | vb->v4l2_buf.index, state); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1185 | |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1186 | /* sync buffers */ |
| 1187 | for (plane = 0; plane < vb->num_planes; ++plane) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1188 | call_void_memop(vb, finish, vb->planes[plane].mem_priv); |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1189 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1190 | /* Add the buffer to the done buffers list */ |
| 1191 | spin_lock_irqsave(&q->done_lock, flags); |
| 1192 | vb->state = state; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1193 | if (state != VB2_BUF_STATE_QUEUED) |
| 1194 | list_add_tail(&vb->done_entry, &q->done_list); |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 1195 | atomic_dec(&q->owned_by_drv_count); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1196 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 1197 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1198 | if (state == VB2_BUF_STATE_QUEUED) |
| 1199 | return; |
| 1200 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1201 | /* Inform any processes that may be waiting for buffers */ |
| 1202 | wake_up(&q->done_wq); |
| 1203 | } |
| 1204 | EXPORT_SYMBOL_GPL(vb2_buffer_done); |
| 1205 | |
| 1206 | /** |
Laurent Pinchart | 34ea4d4 | 2014-03-09 21:42:52 -0300 | [diff] [blame] | 1207 | * vb2_discard_done() - discard all buffers marked as DONE |
| 1208 | * @q: videobuf2 queue |
| 1209 | * |
| 1210 | * This function is intended to be used with suspend/resume operations. It |
| 1211 | * discards all 'done' buffers as they would be too old to be requested after |
| 1212 | * resume. |
| 1213 | * |
| 1214 | * Drivers must stop the hardware and synchronize with interrupt handlers and/or |
| 1215 | * delayed works before calling this function to make sure no buffer will be |
| 1216 | * touched by the driver and/or hardware. |
| 1217 | */ |
| 1218 | void vb2_discard_done(struct vb2_queue *q) |
| 1219 | { |
| 1220 | struct vb2_buffer *vb; |
| 1221 | unsigned long flags; |
| 1222 | |
| 1223 | spin_lock_irqsave(&q->done_lock, flags); |
| 1224 | list_for_each_entry(vb, &q->done_list, done_entry) |
| 1225 | vb->state = VB2_BUF_STATE_ERROR; |
| 1226 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 1227 | } |
| 1228 | EXPORT_SYMBOL_GPL(vb2_discard_done); |
| 1229 | |
| 1230 | /** |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1231 | * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
| 1232 | * v4l2_buffer by the userspace. The caller has already verified that struct |
| 1233 | * v4l2_buffer has a valid number of planes. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1234 | */ |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1235 | 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] | 1236 | struct v4l2_plane *v4l2_planes) |
| 1237 | { |
| 1238 | unsigned int plane; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1239 | |
| 1240 | if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1241 | if (b->memory == V4L2_MEMORY_USERPTR) { |
| 1242 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1243 | v4l2_planes[plane].m.userptr = |
| 1244 | b->m.planes[plane].m.userptr; |
| 1245 | v4l2_planes[plane].length = |
| 1246 | b->m.planes[plane].length; |
| 1247 | } |
| 1248 | } |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1249 | if (b->memory == V4L2_MEMORY_DMABUF) { |
| 1250 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1251 | v4l2_planes[plane].m.fd = |
| 1252 | b->m.planes[plane].m.fd; |
| 1253 | v4l2_planes[plane].length = |
| 1254 | b->m.planes[plane].length; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1255 | } |
| 1256 | } |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 1257 | |
| 1258 | /* Fill in driver-provided information for OUTPUT types */ |
| 1259 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 1260 | /* |
| 1261 | * Will have to go up to b->length when API starts |
| 1262 | * accepting variable number of planes. |
| 1263 | * |
| 1264 | * If bytesused == 0 for the output buffer, then fall |
| 1265 | * back to the full buffer size. In that case |
| 1266 | * userspace clearly never bothered to set it and |
| 1267 | * it's a safe assumption that they really meant to |
| 1268 | * use the full plane sizes. |
| 1269 | */ |
| 1270 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1271 | struct v4l2_plane *pdst = &v4l2_planes[plane]; |
| 1272 | struct v4l2_plane *psrc = &b->m.planes[plane]; |
| 1273 | |
| 1274 | pdst->bytesused = psrc->bytesused ? |
| 1275 | psrc->bytesused : pdst->length; |
| 1276 | pdst->data_offset = psrc->data_offset; |
| 1277 | } |
| 1278 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1279 | } else { |
| 1280 | /* |
| 1281 | * Single-planar buffers do not use planes array, |
| 1282 | * so fill in relevant v4l2_buffer struct fields instead. |
| 1283 | * In videobuf we use our internal V4l2_planes struct for |
| 1284 | * single-planar buffers as well, for simplicity. |
Hans Verkuil | 61bd8fb | 2014-04-07 08:57:48 -0300 | [diff] [blame] | 1285 | * |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 1286 | * If bytesused == 0 for the output buffer, then fall back |
| 1287 | * to the full buffer size as that's a sensible default. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1288 | */ |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1289 | if (b->memory == V4L2_MEMORY_USERPTR) { |
| 1290 | v4l2_planes[0].m.userptr = b->m.userptr; |
| 1291 | v4l2_planes[0].length = b->length; |
| 1292 | } |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1293 | |
| 1294 | if (b->memory == V4L2_MEMORY_DMABUF) { |
| 1295 | v4l2_planes[0].m.fd = b->m.fd; |
| 1296 | v4l2_planes[0].length = b->length; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1297 | } |
Hans Verkuil | 8a75ffb | 2014-07-17 06:53:08 -0300 | [diff] [blame] | 1298 | |
| 1299 | if (V4L2_TYPE_IS_OUTPUT(b->type)) |
| 1300 | v4l2_planes[0].bytesused = b->bytesused ? |
| 1301 | b->bytesused : v4l2_planes[0].length; |
| 1302 | else |
| 1303 | v4l2_planes[0].bytesused = 0; |
| 1304 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1305 | } |
| 1306 | |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1307 | /* Zero flags that the vb2 core handles */ |
Sakari Ailus | 1b18e7a | 2012-10-22 17:10:16 -0300 | [diff] [blame] | 1308 | vb->v4l2_buf.flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS; |
Sakari Ailus | 7ce6fd8 | 2014-02-25 19:08:52 -0300 | [diff] [blame] | 1309 | if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) != |
| 1310 | V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 1311 | /* |
| 1312 | * Non-COPY timestamps and non-OUTPUT queues will get |
| 1313 | * their timestamp and timestamp source flags from the |
| 1314 | * queue. |
| 1315 | */ |
| 1316 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
| 1317 | } |
| 1318 | |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1319 | if (V4L2_TYPE_IS_OUTPUT(b->type)) { |
| 1320 | /* |
| 1321 | * For output buffers mask out the timecode flag: |
| 1322 | * this will be handled later in vb2_internal_qbuf(). |
| 1323 | * The 'field' is valid metadata for this output buffer |
| 1324 | * and so that needs to be copied here. |
| 1325 | */ |
| 1326 | vb->v4l2_buf.flags &= ~V4L2_BUF_FLAG_TIMECODE; |
| 1327 | vb->v4l2_buf.field = b->field; |
| 1328 | } else { |
| 1329 | /* Zero any output buffer flags as this is a capture buffer */ |
| 1330 | vb->v4l2_buf.flags &= ~V4L2_BUFFER_OUT_FLAGS; |
| 1331 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1332 | } |
| 1333 | |
| 1334 | /** |
Hans Verkuil | dcc2428 | 2014-03-10 12:23:13 -0300 | [diff] [blame] | 1335 | * __qbuf_mmap() - handle qbuf of an MMAP buffer |
| 1336 | */ |
| 1337 | static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 1338 | { |
| 1339 | __fill_vb2_buffer(vb, b, vb->v4l2_planes); |
| 1340 | return call_vb_qop(vb, buf_prepare, vb); |
| 1341 | } |
| 1342 | |
| 1343 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1344 | * __qbuf_userptr() - handle qbuf of a USERPTR buffer |
| 1345 | */ |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1346 | 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] | 1347 | { |
| 1348 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; |
| 1349 | struct vb2_queue *q = vb->vb2_queue; |
| 1350 | void *mem_priv; |
| 1351 | unsigned int plane; |
| 1352 | int ret; |
| 1353 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1354 | bool reacquired = vb->planes[0].mem_priv == NULL; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1355 | |
Hans Verkuil | 412376a | 2014-04-07 08:44:56 -0300 | [diff] [blame] | 1356 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1357 | /* Copy relevant information provided by the userspace */ |
| 1358 | __fill_vb2_buffer(vb, b, planes); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1359 | |
| 1360 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1361 | /* Skip the plane if already verified */ |
Marek Szyprowski | f0b7c7f | 2011-11-16 15:09:40 -0300 | [diff] [blame] | 1362 | if (vb->v4l2_planes[plane].m.userptr && |
| 1363 | vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1364 | && vb->v4l2_planes[plane].length == planes[plane].length) |
| 1365 | continue; |
| 1366 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1367 | dprintk(3, "userspace address for plane %d changed, " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1368 | "reacquiring memory\n", plane); |
| 1369 | |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1370 | /* Check if the provided plane buffer is large enough */ |
| 1371 | if (planes[plane].length < q->plane_sizes[plane]) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1372 | dprintk(1, "provided buffer size %u is less than " |
Seung-Woo Kim | 2484a7e | 2013-08-20 04:48:06 -0300 | [diff] [blame] | 1373 | "setup size %u for plane %d\n", |
| 1374 | planes[plane].length, |
| 1375 | q->plane_sizes[plane], plane); |
Marek Szyprowski | 4c2625d | 2011-10-03 03:21:45 -0300 | [diff] [blame] | 1376 | ret = -EINVAL; |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1377 | goto err; |
| 1378 | } |
| 1379 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1380 | /* Release previously acquired memory if present */ |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1381 | if (vb->planes[plane].mem_priv) { |
| 1382 | if (!reacquired) { |
| 1383 | reacquired = true; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1384 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1385 | } |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1386 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1387 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1388 | |
| 1389 | vb->planes[plane].mem_priv = NULL; |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1390 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1391 | |
| 1392 | /* Acquire each plane's memory */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1393 | mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1394 | planes[plane].m.userptr, |
| 1395 | planes[plane].length, write); |
| 1396 | if (IS_ERR_OR_NULL(mem_priv)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1397 | dprintk(1, "failed acquiring userspace " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1398 | "memory for plane %d\n", plane); |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1399 | ret = mem_priv ? PTR_ERR(mem_priv) : -EINVAL; |
| 1400 | goto err; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1401 | } |
Marek Szyprowski | a00d026 | 2011-12-15 05:53:06 -0300 | [diff] [blame] | 1402 | vb->planes[plane].mem_priv = mem_priv; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1403 | } |
| 1404 | |
| 1405 | /* |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1406 | * Now that everything is in order, copy relevant information |
| 1407 | * provided by userspace. |
| 1408 | */ |
| 1409 | for (plane = 0; plane < vb->num_planes; ++plane) |
| 1410 | vb->v4l2_planes[plane] = planes[plane]; |
| 1411 | |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1412 | if (reacquired) { |
| 1413 | /* |
| 1414 | * One or more planes changed, so we must call buf_init to do |
| 1415 | * the driver-specific initialization on the newly acquired |
| 1416 | * buffer, if provided. |
| 1417 | */ |
| 1418 | ret = call_vb_qop(vb, buf_init, vb); |
| 1419 | if (ret) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1420 | dprintk(1, "buffer initialization failed\n"); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1421 | goto err; |
| 1422 | } |
| 1423 | } |
| 1424 | |
| 1425 | ret = call_vb_qop(vb, buf_prepare, vb); |
| 1426 | if (ret) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1427 | dprintk(1, "buffer preparation failed\n"); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1428 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1429 | goto err; |
| 1430 | } |
| 1431 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1432 | return 0; |
| 1433 | err: |
| 1434 | /* In case of errors, release planes that were already acquired */ |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1435 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1436 | if (vb->planes[plane].mem_priv) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1437 | call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv); |
Marek Szyprowski | c1426bc | 2011-08-24 06:36:26 -0300 | [diff] [blame] | 1438 | vb->planes[plane].mem_priv = NULL; |
| 1439 | vb->v4l2_planes[plane].m.userptr = 0; |
| 1440 | vb->v4l2_planes[plane].length = 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1441 | } |
| 1442 | |
| 1443 | return ret; |
| 1444 | } |
| 1445 | |
| 1446 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1447 | * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer |
| 1448 | */ |
| 1449 | static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) |
| 1450 | { |
| 1451 | struct v4l2_plane planes[VIDEO_MAX_PLANES]; |
| 1452 | struct vb2_queue *q = vb->vb2_queue; |
| 1453 | void *mem_priv; |
| 1454 | unsigned int plane; |
| 1455 | int ret; |
| 1456 | int write = !V4L2_TYPE_IS_OUTPUT(q->type); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1457 | bool reacquired = vb->planes[0].mem_priv == NULL; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1458 | |
Hans Verkuil | 412376a | 2014-04-07 08:44:56 -0300 | [diff] [blame] | 1459 | memset(planes, 0, sizeof(planes[0]) * vb->num_planes); |
Laurent Pinchart | 6f546c5 | 2014-01-01 09:10:48 -0300 | [diff] [blame] | 1460 | /* Copy relevant information provided by the userspace */ |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1461 | __fill_vb2_buffer(vb, b, planes); |
| 1462 | |
| 1463 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 1464 | struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); |
| 1465 | |
| 1466 | if (IS_ERR_OR_NULL(dbuf)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1467 | dprintk(1, "invalid dmabuf fd for plane %d\n", |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1468 | plane); |
| 1469 | ret = -EINVAL; |
| 1470 | goto err; |
| 1471 | } |
| 1472 | |
| 1473 | /* use DMABUF size if length is not provided */ |
| 1474 | if (planes[plane].length == 0) |
| 1475 | planes[plane].length = dbuf->size; |
| 1476 | |
Hans Verkuil | 412376a | 2014-04-07 08:44:56 -0300 | [diff] [blame] | 1477 | if (planes[plane].length < q->plane_sizes[plane]) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1478 | dprintk(1, "invalid dmabuf length for plane %d\n", |
Seung-Woo Kim | 77c0782 | 2013-11-29 04:50:29 -0300 | [diff] [blame] | 1479 | plane); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1480 | ret = -EINVAL; |
| 1481 | goto err; |
| 1482 | } |
| 1483 | |
| 1484 | /* Skip the plane if already verified */ |
| 1485 | if (dbuf == vb->planes[plane].dbuf && |
| 1486 | vb->v4l2_planes[plane].length == planes[plane].length) { |
| 1487 | dma_buf_put(dbuf); |
| 1488 | continue; |
| 1489 | } |
| 1490 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1491 | dprintk(1, "buffer for plane %d changed\n", plane); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1492 | |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1493 | if (!reacquired) { |
| 1494 | reacquired = true; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1495 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1496 | } |
| 1497 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1498 | /* Release previously acquired memory if present */ |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 1499 | __vb2_plane_dmabuf_put(vb, &vb->planes[plane]); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1500 | memset(&vb->v4l2_planes[plane], 0, sizeof(struct v4l2_plane)); |
| 1501 | |
| 1502 | /* Acquire each plane's memory */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1503 | mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1504 | dbuf, planes[plane].length, write); |
| 1505 | if (IS_ERR(mem_priv)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1506 | dprintk(1, "failed to attach dmabuf\n"); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1507 | ret = PTR_ERR(mem_priv); |
| 1508 | dma_buf_put(dbuf); |
| 1509 | goto err; |
| 1510 | } |
| 1511 | |
| 1512 | vb->planes[plane].dbuf = dbuf; |
| 1513 | vb->planes[plane].mem_priv = mem_priv; |
| 1514 | } |
| 1515 | |
| 1516 | /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but |
| 1517 | * really we want to do this just before the DMA, not while queueing |
| 1518 | * the buffer(s).. |
| 1519 | */ |
| 1520 | for (plane = 0; plane < vb->num_planes; ++plane) { |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 1521 | ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1522 | if (ret) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1523 | dprintk(1, "failed to map dmabuf for plane %d\n", |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1524 | plane); |
| 1525 | goto err; |
| 1526 | } |
| 1527 | vb->planes[plane].dbuf_mapped = 1; |
| 1528 | } |
| 1529 | |
| 1530 | /* |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1531 | * Now that everything is in order, copy relevant information |
| 1532 | * provided by userspace. |
| 1533 | */ |
| 1534 | for (plane = 0; plane < vb->num_planes; ++plane) |
| 1535 | vb->v4l2_planes[plane] = planes[plane]; |
| 1536 | |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1537 | if (reacquired) { |
| 1538 | /* |
| 1539 | * Call driver-specific initialization on the newly acquired buffer, |
| 1540 | * if provided. |
| 1541 | */ |
| 1542 | ret = call_vb_qop(vb, buf_init, vb); |
| 1543 | if (ret) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1544 | dprintk(1, "buffer initialization failed\n"); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1545 | goto err; |
| 1546 | } |
| 1547 | } |
| 1548 | |
| 1549 | ret = call_vb_qop(vb, buf_prepare, vb); |
| 1550 | if (ret) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1551 | dprintk(1, "buffer preparation failed\n"); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1552 | call_void_vb_qop(vb, buf_cleanup, vb); |
Hans Verkuil | 256f316 | 2014-01-29 13:36:53 -0300 | [diff] [blame] | 1553 | goto err; |
| 1554 | } |
| 1555 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1556 | return 0; |
| 1557 | err: |
| 1558 | /* In case of errors, release planes that were already acquired */ |
| 1559 | __vb2_buf_dmabuf_put(vb); |
| 1560 | |
| 1561 | return ret; |
| 1562 | } |
| 1563 | |
| 1564 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1565 | * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing |
| 1566 | */ |
| 1567 | static void __enqueue_in_driver(struct vb2_buffer *vb) |
| 1568 | { |
| 1569 | struct vb2_queue *q = vb->vb2_queue; |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1570 | unsigned int plane; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1571 | |
| 1572 | vb->state = VB2_BUF_STATE_ACTIVE; |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 1573 | atomic_inc(&q->owned_by_drv_count); |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1574 | |
| 1575 | /* sync buffers */ |
| 1576 | for (plane = 0; plane < vb->num_planes; ++plane) |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1577 | call_void_memop(vb, prepare, vb->planes[plane].mem_priv); |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 1578 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1579 | call_void_vb_qop(vb, buf_queue, vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1580 | } |
| 1581 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1582 | 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] | 1583 | { |
| 1584 | struct vb2_queue *q = vb->vb2_queue; |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1585 | struct rw_semaphore *mmap_sem; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1586 | int ret; |
| 1587 | |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 1588 | ret = __verify_length(vb, b); |
Sylwester Nawrocki | 3a9621b | 2013-08-26 11:47:53 -0300 | [diff] [blame] | 1589 | if (ret < 0) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1590 | dprintk(1, "plane parameters verification failed: %d\n", ret); |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 1591 | return ret; |
Sylwester Nawrocki | 3a9621b | 2013-08-26 11:47:53 -0300 | [diff] [blame] | 1592 | } |
Hans Verkuil | e35e41b | 2014-04-07 09:20:39 -0300 | [diff] [blame] | 1593 | if (b->field == V4L2_FIELD_ALTERNATE && V4L2_TYPE_IS_OUTPUT(q->type)) { |
| 1594 | /* |
| 1595 | * If the format's field is ALTERNATE, then the buffer's field |
| 1596 | * should be either TOP or BOTTOM, not ALTERNATE since that |
| 1597 | * makes no sense. The driver has to know whether the |
| 1598 | * buffer represents a top or a bottom field in order to |
| 1599 | * program any DMA correctly. Using ALTERNATE is wrong, since |
| 1600 | * that just says that it is either a top or a bottom field, |
| 1601 | * but not which of the two it is. |
| 1602 | */ |
| 1603 | dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n"); |
| 1604 | return -EINVAL; |
| 1605 | } |
Laurent Pinchart | 8023ed0 | 2012-07-10 10:41:40 -0300 | [diff] [blame] | 1606 | |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 1607 | if (q->error) { |
| 1608 | dprintk(1, "fatal error occurred on queue\n"); |
| 1609 | return -EIO; |
| 1610 | } |
| 1611 | |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1612 | vb->state = VB2_BUF_STATE_PREPARING; |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1613 | vb->v4l2_buf.timestamp.tv_sec = 0; |
| 1614 | vb->v4l2_buf.timestamp.tv_usec = 0; |
| 1615 | vb->v4l2_buf.sequence = 0; |
| 1616 | |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1617 | switch (q->memory) { |
| 1618 | case V4L2_MEMORY_MMAP: |
| 1619 | ret = __qbuf_mmap(vb, b); |
| 1620 | break; |
| 1621 | case V4L2_MEMORY_USERPTR: |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1622 | /* |
Mauro Carvalho Chehab | f103b5d | 2014-01-07 07:03:09 -0200 | [diff] [blame] | 1623 | * In case of user pointer buffers vb2 allocators need to get |
| 1624 | * direct access to userspace pages. This requires getting |
| 1625 | * the mmap semaphore for read access in the current process |
| 1626 | * structure. The same semaphore is taken before calling mmap |
| 1627 | * operation, while both qbuf/prepare_buf and mmap are called |
| 1628 | * by the driver or v4l2 core with the driver's lock held. |
| 1629 | * To avoid an AB-BA deadlock (mmap_sem then driver's lock in |
| 1630 | * mmap and driver's lock then mmap_sem in qbuf/prepare_buf), |
| 1631 | * the videobuf2 core releases the driver's lock, takes |
| 1632 | * mmap_sem and then takes the driver's lock again. |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1633 | */ |
| 1634 | mmap_sem = ¤t->mm->mmap_sem; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1635 | call_void_qop(q, wait_prepare, q); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1636 | down_read(mmap_sem); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1637 | call_void_qop(q, wait_finish, q); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1638 | |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1639 | ret = __qbuf_userptr(vb, b); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1640 | |
| 1641 | up_read(mmap_sem); |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1642 | break; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 1643 | case V4L2_MEMORY_DMABUF: |
| 1644 | ret = __qbuf_dmabuf(vb, b); |
| 1645 | break; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1646 | default: |
| 1647 | WARN(1, "Invalid queue type\n"); |
| 1648 | ret = -EINVAL; |
| 1649 | } |
| 1650 | |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1651 | if (ret) |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1652 | dprintk(1, "buffer preparation failed: %d\n", ret); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1653 | vb->state = ret ? VB2_BUF_STATE_DEQUEUED : VB2_BUF_STATE_PREPARED; |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 1654 | |
| 1655 | return ret; |
| 1656 | } |
| 1657 | |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1658 | 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] | 1659 | const char *opname) |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1660 | { |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1661 | if (b->type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1662 | dprintk(1, "%s: invalid buffer type\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1663 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1664 | } |
| 1665 | |
| 1666 | if (b->index >= q->num_buffers) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1667 | dprintk(1, "%s: buffer index out of range\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1668 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1669 | } |
| 1670 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1671 | if (q->bufs[b->index] == NULL) { |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1672 | /* Should never happen */ |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1673 | dprintk(1, "%s: buffer is NULL\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1674 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1675 | } |
| 1676 | |
| 1677 | if (b->memory != q->memory) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1678 | dprintk(1, "%s: invalid memory type\n", opname); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1679 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1680 | } |
| 1681 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1682 | return __verify_planes_array(q->bufs[b->index], b); |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1683 | } |
| 1684 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1685 | /** |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1686 | * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel |
| 1687 | * @q: videobuf2 queue |
| 1688 | * @b: buffer structure passed from userspace to vidioc_prepare_buf |
| 1689 | * handler in driver |
| 1690 | * |
| 1691 | * Should be called from vidioc_prepare_buf ioctl handler of a driver. |
| 1692 | * This function: |
| 1693 | * 1) verifies the passed buffer, |
| 1694 | * 2) calls buf_prepare callback in the driver (if provided), in which |
| 1695 | * driver-specific buffer initialization can be performed, |
| 1696 | * |
| 1697 | * The return values from this function are intended to be directly returned |
| 1698 | * from vidioc_prepare_buf handler in driver. |
| 1699 | */ |
| 1700 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 1701 | { |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1702 | struct vb2_buffer *vb; |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1703 | int ret; |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1704 | |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 1705 | if (vb2_fileio_is_active(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1706 | dprintk(1, "file io in progress\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1707 | return -EBUSY; |
| 1708 | } |
| 1709 | |
| 1710 | ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf"); |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1711 | if (ret) |
| 1712 | return ret; |
| 1713 | |
| 1714 | vb = q->bufs[b->index]; |
| 1715 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1716 | dprintk(1, "invalid buffer state %d\n", |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1717 | vb->state); |
| 1718 | return -EINVAL; |
| 1719 | } |
| 1720 | |
| 1721 | ret = __buf_prepare(vb, b); |
| 1722 | if (!ret) { |
| 1723 | /* Fill buffer information for the userspace */ |
| 1724 | __fill_v4l2_buffer(vb, b); |
| 1725 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1726 | dprintk(1, "prepare of buffer %d succeeded\n", vb->v4l2_buf.index); |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1727 | } |
| 1728 | return ret; |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 1729 | } |
| 1730 | EXPORT_SYMBOL_GPL(vb2_prepare_buf); |
| 1731 | |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1732 | /** |
| 1733 | * vb2_start_streaming() - Attempt to start streaming. |
| 1734 | * @q: videobuf2 queue |
| 1735 | * |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1736 | * Attempt to start streaming. When this function is called there must be |
| 1737 | * at least q->min_buffers_needed buffers queued up (i.e. the minimum |
| 1738 | * number of buffers required for the DMA engine to function). If the |
| 1739 | * @start_streaming op fails it is supposed to return all the driver-owned |
| 1740 | * buffers back to vb2 in state QUEUED. Check if that happened and if |
| 1741 | * not warn and reclaim them forcefully. |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1742 | */ |
| 1743 | static int vb2_start_streaming(struct vb2_queue *q) |
| 1744 | { |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1745 | struct vb2_buffer *vb; |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1746 | int ret; |
| 1747 | |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1748 | /* |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1749 | * If any buffers were queued before streamon, |
| 1750 | * we can now pass them to driver for processing. |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1751 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1752 | list_for_each_entry(vb, &q->queued_list, queued_entry) |
| 1753 | __enqueue_in_driver(vb); |
| 1754 | |
| 1755 | /* Tell the driver to start streaming */ |
Laurent Pinchart | bd994dd | 2014-06-23 18:00:22 -0300 | [diff] [blame] | 1756 | q->start_streaming_called = 1; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1757 | ret = call_qop(q, start_streaming, q, |
| 1758 | atomic_read(&q->owned_by_drv_count)); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1759 | if (!ret) |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1760 | return 0; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1761 | |
Laurent Pinchart | bd994dd | 2014-06-23 18:00:22 -0300 | [diff] [blame] | 1762 | q->start_streaming_called = 0; |
| 1763 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1764 | dprintk(1, "driver refused to start streaming\n"); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1765 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
| 1766 | unsigned i; |
| 1767 | |
| 1768 | /* |
| 1769 | * Forcefully reclaim buffers if the driver did not |
| 1770 | * correctly return them to vb2. |
| 1771 | */ |
| 1772 | for (i = 0; i < q->num_buffers; ++i) { |
| 1773 | vb = q->bufs[i]; |
| 1774 | if (vb->state == VB2_BUF_STATE_ACTIVE) |
| 1775 | vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); |
| 1776 | } |
| 1777 | /* Must be zero now */ |
| 1778 | WARN_ON(atomic_read(&q->owned_by_drv_count)); |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1779 | } |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1780 | return ret; |
| 1781 | } |
| 1782 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1783 | 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] | 1784 | { |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1785 | int ret = vb2_queue_or_prepare_buf(q, b, "qbuf"); |
| 1786 | struct vb2_buffer *vb; |
| 1787 | |
| 1788 | if (ret) |
| 1789 | return ret; |
| 1790 | |
| 1791 | vb = q->bufs[b->index]; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1792 | |
| 1793 | switch (vb->state) { |
| 1794 | case VB2_BUF_STATE_DEQUEUED: |
| 1795 | ret = __buf_prepare(vb, b); |
| 1796 | if (ret) |
| 1797 | return ret; |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1798 | break; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1799 | case VB2_BUF_STATE_PREPARED: |
| 1800 | break; |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1801 | case VB2_BUF_STATE_PREPARING: |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1802 | dprintk(1, "buffer still being prepared\n"); |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 1803 | return -EINVAL; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1804 | default: |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1805 | dprintk(1, "invalid buffer state %d\n", vb->state); |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1806 | return -EINVAL; |
| 1807 | } |
| 1808 | |
| 1809 | /* |
| 1810 | * Add to the queued buffers list, a buffer will stay on it until |
| 1811 | * dequeued in dqbuf. |
| 1812 | */ |
| 1813 | list_add_tail(&vb->queued_entry, &q->queued_list); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1814 | q->queued_count++; |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1815 | vb->state = VB2_BUF_STATE_QUEUED; |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1816 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
| 1817 | /* |
| 1818 | * For output buffers copy the timestamp if needed, |
| 1819 | * and the timecode field and flag if needed. |
| 1820 | */ |
Sakari Ailus | c57ff79 | 2014-03-01 10:28:02 -0300 | [diff] [blame] | 1821 | if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 1822 | V4L2_BUF_FLAG_TIMESTAMP_COPY) |
Hans Verkuil | f134328 | 2014-02-24 14:44:50 -0300 | [diff] [blame] | 1823 | vb->v4l2_buf.timestamp = b->timestamp; |
| 1824 | vb->v4l2_buf.flags |= b->flags & V4L2_BUF_FLAG_TIMECODE; |
| 1825 | if (b->flags & V4L2_BUF_FLAG_TIMECODE) |
| 1826 | vb->v4l2_buf.timecode = b->timecode; |
| 1827 | } |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1828 | |
| 1829 | /* |
| 1830 | * If already streaming, give the buffer to driver for processing. |
| 1831 | * If not, the buffer will be given to driver on next streamon. |
| 1832 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1833 | if (q->start_streaming_called) |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1834 | __enqueue_in_driver(vb); |
| 1835 | |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1836 | /* Fill buffer information for the userspace */ |
| 1837 | __fill_v4l2_buffer(vb, b); |
Laurent Pinchart | 012043b | 2013-08-09 08:11:26 -0300 | [diff] [blame] | 1838 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 1839 | /* |
| 1840 | * If streamon has been called, and we haven't yet called |
| 1841 | * start_streaming() since not enough buffers were queued, and |
| 1842 | * we now have reached the minimum number of queued buffers, |
| 1843 | * then we can finally call start_streaming(). |
| 1844 | */ |
| 1845 | if (q->streaming && !q->start_streaming_called && |
| 1846 | q->queued_count >= q->min_buffers_needed) { |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 1847 | ret = vb2_start_streaming(q); |
| 1848 | if (ret) |
| 1849 | return ret; |
| 1850 | } |
| 1851 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1852 | dprintk(1, "qbuf of buffer %d succeeded\n", vb->v4l2_buf.index); |
Hans Verkuil | 4138111 | 2013-12-13 13:13:39 -0300 | [diff] [blame] | 1853 | return 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1854 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1855 | |
| 1856 | /** |
| 1857 | * vb2_qbuf() - Queue a buffer from userspace |
| 1858 | * @q: videobuf2 queue |
| 1859 | * @b: buffer structure passed from userspace to vidioc_qbuf handler |
| 1860 | * in driver |
| 1861 | * |
| 1862 | * Should be called from vidioc_qbuf ioctl handler of a driver. |
| 1863 | * This function: |
| 1864 | * 1) verifies the passed buffer, |
| 1865 | * 2) if necessary, calls buf_prepare callback in the driver (if provided), in |
| 1866 | * which driver-specific buffer initialization can be performed, |
| 1867 | * 3) if streaming is on, queues the buffer in driver by the means of buf_queue |
| 1868 | * callback for processing. |
| 1869 | * |
| 1870 | * The return values from this function are intended to be directly returned |
| 1871 | * from vidioc_qbuf handler in driver. |
| 1872 | */ |
| 1873 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) |
| 1874 | { |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 1875 | if (vb2_fileio_is_active(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 1876 | dprintk(1, "file io in progress\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 1877 | return -EBUSY; |
| 1878 | } |
| 1879 | |
| 1880 | return vb2_internal_qbuf(q, b); |
| 1881 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1882 | EXPORT_SYMBOL_GPL(vb2_qbuf); |
| 1883 | |
| 1884 | /** |
| 1885 | * __vb2_wait_for_done_vb() - wait for a buffer to become available |
| 1886 | * for dequeuing |
| 1887 | * |
| 1888 | * Will sleep if required for nonblocking == false. |
| 1889 | */ |
| 1890 | static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) |
| 1891 | { |
| 1892 | /* |
| 1893 | * All operations on vb_done_list are performed under done_lock |
| 1894 | * spinlock protection. However, buffers may be removed from |
| 1895 | * it and returned to userspace only while holding both driver's |
| 1896 | * lock and the done_lock spinlock. Thus we can be sure that as |
| 1897 | * long as we hold the driver's lock, the list will remain not |
| 1898 | * empty if list_empty() check succeeds. |
| 1899 | */ |
| 1900 | |
| 1901 | for (;;) { |
| 1902 | int ret; |
| 1903 | |
| 1904 | if (!q->streaming) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 1905 | dprintk(1, "streaming off, will not wait for buffers\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1906 | return -EINVAL; |
| 1907 | } |
| 1908 | |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 1909 | if (q->error) { |
| 1910 | dprintk(1, "Queue in error state, will not wait for buffers\n"); |
| 1911 | return -EIO; |
| 1912 | } |
| 1913 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1914 | if (!list_empty(&q->done_list)) { |
| 1915 | /* |
| 1916 | * Found a buffer that we were waiting for. |
| 1917 | */ |
| 1918 | break; |
| 1919 | } |
| 1920 | |
| 1921 | if (nonblocking) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 1922 | dprintk(1, "nonblocking and no buffers to dequeue, " |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1923 | "will not wait\n"); |
| 1924 | return -EAGAIN; |
| 1925 | } |
| 1926 | |
| 1927 | /* |
| 1928 | * We are streaming and blocking, wait for another buffer to |
| 1929 | * become ready or for streamoff. Driver's lock is released to |
| 1930 | * allow streamoff or qbuf to be called while waiting. |
| 1931 | */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1932 | call_void_qop(q, wait_prepare, q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1933 | |
| 1934 | /* |
| 1935 | * All locks have been released, it is safe to sleep now. |
| 1936 | */ |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 1937 | dprintk(3, "will sleep waiting for buffers\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1938 | ret = wait_event_interruptible(q->done_wq, |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 1939 | !list_empty(&q->done_list) || !q->streaming || |
| 1940 | q->error); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1941 | |
| 1942 | /* |
| 1943 | * We need to reevaluate both conditions again after reacquiring |
| 1944 | * the locks or return an error if one occurred. |
| 1945 | */ |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 1946 | call_void_qop(q, wait_finish, q); |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1947 | if (ret) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 1948 | dprintk(1, "sleep was interrupted\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1949 | return ret; |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1950 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1951 | } |
| 1952 | return 0; |
| 1953 | } |
| 1954 | |
| 1955 | /** |
| 1956 | * __vb2_get_done_vb() - get a buffer ready for dequeuing |
| 1957 | * |
| 1958 | * Will sleep if required for nonblocking == false. |
| 1959 | */ |
| 1960 | 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] | 1961 | struct v4l2_buffer *b, int nonblocking) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1962 | { |
| 1963 | unsigned long flags; |
| 1964 | int ret; |
| 1965 | |
| 1966 | /* |
| 1967 | * Wait for at least one buffer to become available on the done_list. |
| 1968 | */ |
| 1969 | ret = __vb2_wait_for_done_vb(q, nonblocking); |
| 1970 | if (ret) |
| 1971 | return ret; |
| 1972 | |
| 1973 | /* |
| 1974 | * Driver's lock has been held since we last verified that done_list |
| 1975 | * is not empty, so no need for another list_empty(done_list) check. |
| 1976 | */ |
| 1977 | spin_lock_irqsave(&q->done_lock, flags); |
| 1978 | *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry); |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1979 | /* |
| 1980 | * Only remove the buffer from done_list if v4l2_buffer can handle all |
| 1981 | * the planes. |
| 1982 | */ |
| 1983 | ret = __verify_planes_array(*vb, b); |
| 1984 | if (!ret) |
| 1985 | list_del(&(*vb)->done_entry); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1986 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 1987 | |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 1988 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1989 | } |
| 1990 | |
| 1991 | /** |
| 1992 | * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2 |
| 1993 | * @q: videobuf2 queue |
| 1994 | * |
| 1995 | * This function will wait until all buffers that have been given to the driver |
| 1996 | * by buf_queue() are given back to vb2 with vb2_buffer_done(). It doesn't call |
| 1997 | * wait_prepare, wait_finish pair. It is intended to be called with all locks |
| 1998 | * taken, for example from stop_streaming() callback. |
| 1999 | */ |
| 2000 | int vb2_wait_for_all_buffers(struct vb2_queue *q) |
| 2001 | { |
| 2002 | if (!q->streaming) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2003 | dprintk(1, "streaming off, will not wait for buffers\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2004 | return -EINVAL; |
| 2005 | } |
| 2006 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2007 | if (q->start_streaming_called) |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 2008 | wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count)); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2009 | return 0; |
| 2010 | } |
| 2011 | EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); |
| 2012 | |
| 2013 | /** |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 2014 | * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state |
| 2015 | */ |
| 2016 | static void __vb2_dqbuf(struct vb2_buffer *vb) |
| 2017 | { |
| 2018 | struct vb2_queue *q = vb->vb2_queue; |
| 2019 | unsigned int i; |
| 2020 | |
| 2021 | /* nothing to do if the buffer is already dequeued */ |
| 2022 | if (vb->state == VB2_BUF_STATE_DEQUEUED) |
| 2023 | return; |
| 2024 | |
| 2025 | vb->state = VB2_BUF_STATE_DEQUEUED; |
| 2026 | |
| 2027 | /* unmap DMABUF buffer */ |
| 2028 | if (q->memory == V4L2_MEMORY_DMABUF) |
| 2029 | for (i = 0; i < vb->num_planes; ++i) { |
| 2030 | if (!vb->planes[i].dbuf_mapped) |
| 2031 | continue; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 2032 | call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv); |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 2033 | vb->planes[i].dbuf_mapped = 0; |
| 2034 | } |
| 2035 | } |
| 2036 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2037 | 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] | 2038 | { |
| 2039 | struct vb2_buffer *vb = NULL; |
| 2040 | int ret; |
| 2041 | |
| 2042 | if (b->type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2043 | dprintk(1, "invalid buffer type\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2044 | return -EINVAL; |
| 2045 | } |
Hans Verkuil | 32a7726 | 2012-09-28 06:12:53 -0300 | [diff] [blame] | 2046 | ret = __vb2_get_done_vb(q, &vb, b, nonblocking); |
| 2047 | if (ret < 0) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2048 | return ret; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2049 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2050 | switch (vb->state) { |
| 2051 | case VB2_BUF_STATE_DONE: |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2052 | dprintk(3, "returning done buffer\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2053 | break; |
| 2054 | case VB2_BUF_STATE_ERROR: |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2055 | dprintk(3, "returning done buffer with errors\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2056 | break; |
| 2057 | default: |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2058 | dprintk(1, "invalid buffer state\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2059 | return -EINVAL; |
| 2060 | } |
| 2061 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 2062 | call_void_vb_qop(vb, buf_finish, vb); |
Hans Verkuil | 9cf3c31 | 2014-02-28 13:30:48 -0300 | [diff] [blame] | 2063 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2064 | /* Fill buffer information for the userspace */ |
| 2065 | __fill_v4l2_buffer(vb, b); |
| 2066 | /* Remove from videobuf queue */ |
| 2067 | list_del(&vb->queued_entry); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2068 | q->queued_count--; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 2069 | /* go back to dequeued state */ |
| 2070 | __vb2_dqbuf(vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2071 | |
| 2072 | dprintk(1, "dqbuf of buffer %d, with state %d\n", |
| 2073 | vb->v4l2_buf.index, vb->state); |
| 2074 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2075 | return 0; |
| 2076 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2077 | |
| 2078 | /** |
| 2079 | * vb2_dqbuf() - Dequeue a buffer to the userspace |
| 2080 | * @q: videobuf2 queue |
| 2081 | * @b: buffer structure passed from userspace to vidioc_dqbuf handler |
| 2082 | * in driver |
| 2083 | * @nonblocking: if true, this call will not sleep waiting for a buffer if no |
| 2084 | * buffers ready for dequeuing are present. Normally the driver |
| 2085 | * would be passing (file->f_flags & O_NONBLOCK) here |
| 2086 | * |
| 2087 | * Should be called from vidioc_dqbuf ioctl handler of a driver. |
| 2088 | * This function: |
| 2089 | * 1) verifies the passed buffer, |
| 2090 | * 2) calls buf_finish callback in the driver (if provided), in which |
| 2091 | * driver can perform any additional operations that may be required before |
| 2092 | * returning the buffer to userspace, such as cache sync, |
| 2093 | * 3) the buffer struct members are filled with relevant information for |
| 2094 | * the userspace. |
| 2095 | * |
| 2096 | * The return values from this function are intended to be directly returned |
| 2097 | * from vidioc_dqbuf handler in driver. |
| 2098 | */ |
| 2099 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) |
| 2100 | { |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2101 | if (vb2_fileio_is_active(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2102 | dprintk(1, "file io in progress\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2103 | return -EBUSY; |
| 2104 | } |
| 2105 | return vb2_internal_dqbuf(q, b, nonblocking); |
| 2106 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2107 | EXPORT_SYMBOL_GPL(vb2_dqbuf); |
| 2108 | |
| 2109 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2110 | * __vb2_queue_cancel() - cancel and stop (pause) streaming |
| 2111 | * |
| 2112 | * Removes all queued buffers from driver's queue and all buffers queued by |
| 2113 | * userspace from videobuf's queue. Returns to state after reqbufs. |
| 2114 | */ |
| 2115 | static void __vb2_queue_cancel(struct vb2_queue *q) |
| 2116 | { |
| 2117 | unsigned int i; |
| 2118 | |
| 2119 | /* |
| 2120 | * Tell driver to stop all transactions and release all queued |
| 2121 | * buffers. |
| 2122 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2123 | if (q->start_streaming_called) |
Hans Verkuil | e37559b | 2014-04-17 02:47:21 -0300 | [diff] [blame] | 2124 | call_void_qop(q, stop_streaming, q); |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2125 | |
| 2126 | if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { |
| 2127 | for (i = 0; i < q->num_buffers; ++i) |
| 2128 | if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) |
| 2129 | vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); |
| 2130 | /* Must be zero now */ |
| 2131 | WARN_ON(atomic_read(&q->owned_by_drv_count)); |
| 2132 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2133 | |
Laurent Pinchart | b646f0b | 2014-04-20 20:55:41 -0300 | [diff] [blame] | 2134 | q->streaming = 0; |
| 2135 | q->start_streaming_called = 0; |
| 2136 | q->queued_count = 0; |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 2137 | q->error = 0; |
Laurent Pinchart | b646f0b | 2014-04-20 20:55:41 -0300 | [diff] [blame] | 2138 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2139 | /* |
| 2140 | * Remove all buffers from videobuf's list... |
| 2141 | */ |
| 2142 | INIT_LIST_HEAD(&q->queued_list); |
| 2143 | /* |
| 2144 | * ...and done list; userspace will not receive any buffers it |
| 2145 | * has not already dequeued before initiating cancel. |
| 2146 | */ |
| 2147 | INIT_LIST_HEAD(&q->done_list); |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 2148 | atomic_set(&q->owned_by_drv_count, 0); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2149 | wake_up_all(&q->done_wq); |
| 2150 | |
| 2151 | /* |
| 2152 | * Reinitialize all buffers for next use. |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 2153 | * Make sure to call buf_finish for any queued buffers. Normally |
| 2154 | * that's done in dqbuf, but that's not going to happen when we |
| 2155 | * cancel the whole queue. Note: this code belongs here, not in |
| 2156 | * __vb2_dqbuf() since in vb2_internal_dqbuf() there is a critical |
| 2157 | * call to __fill_v4l2_buffer() after buf_finish(). That order can't |
| 2158 | * 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] | 2159 | */ |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 2160 | for (i = 0; i < q->num_buffers; ++i) { |
| 2161 | struct vb2_buffer *vb = q->bufs[i]; |
| 2162 | |
| 2163 | if (vb->state != VB2_BUF_STATE_DEQUEUED) { |
| 2164 | vb->state = VB2_BUF_STATE_PREPARED; |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 2165 | call_void_vb_qop(vb, buf_finish, vb); |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 2166 | } |
| 2167 | __vb2_dqbuf(vb); |
| 2168 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2169 | } |
| 2170 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2171 | 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] | 2172 | { |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2173 | int ret; |
| 2174 | |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2175 | if (type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2176 | dprintk(1, "invalid stream type\n"); |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2177 | return -EINVAL; |
| 2178 | } |
| 2179 | |
| 2180 | if (q->streaming) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2181 | dprintk(3, "already streaming\n"); |
Ricardo Ribalda | f956035 | 2013-11-08 07:08:45 -0300 | [diff] [blame] | 2182 | return 0; |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2183 | } |
| 2184 | |
Ricardo Ribalda | 548df78 | 2014-01-08 05:01:33 -0300 | [diff] [blame] | 2185 | if (!q->num_buffers) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2186 | dprintk(1, "no buffers have been allocated\n"); |
Ricardo Ribalda | 548df78 | 2014-01-08 05:01:33 -0300 | [diff] [blame] | 2187 | return -EINVAL; |
| 2188 | } |
| 2189 | |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2190 | if (q->num_buffers < q->min_buffers_needed) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2191 | dprintk(1, "need at least %u allocated buffers\n", |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2192 | q->min_buffers_needed); |
| 2193 | return -EINVAL; |
| 2194 | } |
Ricardo Ribalda Delgado | 249f5a5 | 2014-01-08 05:01:33 -0300 | [diff] [blame] | 2195 | |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2196 | /* |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2197 | * Tell driver to start streaming provided sufficient buffers |
| 2198 | * are available. |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2199 | */ |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 2200 | if (q->queued_count >= q->min_buffers_needed) { |
| 2201 | ret = vb2_start_streaming(q); |
| 2202 | if (ret) { |
| 2203 | __vb2_queue_cancel(q); |
| 2204 | return ret; |
| 2205 | } |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2206 | } |
| 2207 | |
| 2208 | q->streaming = 1; |
| 2209 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2210 | dprintk(3, "successful\n"); |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2211 | return 0; |
| 2212 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2213 | |
| 2214 | /** |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 2215 | * vb2_queue_error() - signal a fatal error on the queue |
| 2216 | * @q: videobuf2 queue |
| 2217 | * |
| 2218 | * Flag that a fatal unrecoverable error has occurred and wake up all processes |
| 2219 | * waiting on the queue. Polling will now set POLLERR and queuing and dequeuing |
| 2220 | * buffers will return -EIO. |
| 2221 | * |
| 2222 | * The error flag will be cleared when cancelling the queue, either from |
| 2223 | * vb2_streamoff or vb2_queue_release. Drivers should thus not call this |
| 2224 | * function before starting the stream, otherwise the error flag will remain set |
| 2225 | * until the queue is released when closing the device node. |
| 2226 | */ |
| 2227 | void vb2_queue_error(struct vb2_queue *q) |
| 2228 | { |
| 2229 | q->error = 1; |
| 2230 | |
| 2231 | wake_up_all(&q->done_wq); |
| 2232 | } |
| 2233 | EXPORT_SYMBOL_GPL(vb2_queue_error); |
| 2234 | |
| 2235 | /** |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2236 | * vb2_streamon - start streaming |
| 2237 | * @q: videobuf2 queue |
| 2238 | * @type: type argument passed from userspace to vidioc_streamon handler |
| 2239 | * |
| 2240 | * Should be called from vidioc_streamon handler of a driver. |
| 2241 | * This function: |
| 2242 | * 1) verifies current state |
| 2243 | * 2) passes any previously queued buffers to the driver and starts streaming |
| 2244 | * |
| 2245 | * The return values from this function are intended to be directly returned |
| 2246 | * from vidioc_streamon handler in the driver. |
| 2247 | */ |
| 2248 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type) |
| 2249 | { |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2250 | if (vb2_fileio_is_active(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2251 | dprintk(1, "file io in progress\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2252 | return -EBUSY; |
| 2253 | } |
| 2254 | return vb2_internal_streamon(q, type); |
| 2255 | } |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2256 | EXPORT_SYMBOL_GPL(vb2_streamon); |
| 2257 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2258 | static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
| 2259 | { |
| 2260 | if (type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2261 | dprintk(1, "invalid stream type\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2262 | return -EINVAL; |
| 2263 | } |
| 2264 | |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2265 | /* |
| 2266 | * Cancel will pause streaming and remove all buffers from the driver |
| 2267 | * and videobuf, effectively returning control over them to userspace. |
Hans Verkuil | 3f1a9a3 | 2014-02-25 09:42:45 -0300 | [diff] [blame] | 2268 | * |
| 2269 | * Note that we do this even if q->streaming == 0: if you prepare or |
| 2270 | * queue buffers, and then call streamoff without ever having called |
| 2271 | * streamon, you would still expect those buffers to be returned to |
| 2272 | * their normal dequeued state. |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2273 | */ |
| 2274 | __vb2_queue_cancel(q); |
| 2275 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2276 | dprintk(3, "successful\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2277 | return 0; |
| 2278 | } |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 2279 | |
| 2280 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2281 | * vb2_streamoff - stop streaming |
| 2282 | * @q: videobuf2 queue |
| 2283 | * @type: type argument passed from userspace to vidioc_streamoff handler |
| 2284 | * |
| 2285 | * Should be called from vidioc_streamoff handler of a driver. |
| 2286 | * This function: |
| 2287 | * 1) verifies current state, |
| 2288 | * 2) stop streaming and dequeues any queued buffers, including those previously |
| 2289 | * passed to the driver (after waiting for the driver to finish). |
| 2290 | * |
| 2291 | * This call can be used for pausing playback. |
| 2292 | * The return values from this function are intended to be directly returned |
| 2293 | * from vidioc_streamoff handler in the driver |
| 2294 | */ |
| 2295 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) |
| 2296 | { |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2297 | if (vb2_fileio_is_active(q)) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2298 | dprintk(1, "file io in progress\n"); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2299 | return -EBUSY; |
| 2300 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2301 | return vb2_internal_streamoff(q, type); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2302 | } |
| 2303 | EXPORT_SYMBOL_GPL(vb2_streamoff); |
| 2304 | |
| 2305 | /** |
| 2306 | * __find_plane_by_offset() - find plane associated with the given offset off |
| 2307 | */ |
| 2308 | static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, |
| 2309 | unsigned int *_buffer, unsigned int *_plane) |
| 2310 | { |
| 2311 | struct vb2_buffer *vb; |
| 2312 | unsigned int buffer, plane; |
| 2313 | |
| 2314 | /* |
| 2315 | * Go over all buffers and their planes, comparing the given offset |
| 2316 | * with an offset assigned to each plane. If a match is found, |
| 2317 | * return its buffer and plane numbers. |
| 2318 | */ |
| 2319 | for (buffer = 0; buffer < q->num_buffers; ++buffer) { |
| 2320 | vb = q->bufs[buffer]; |
| 2321 | |
| 2322 | for (plane = 0; plane < vb->num_planes; ++plane) { |
| 2323 | if (vb->v4l2_planes[plane].m.mem_offset == off) { |
| 2324 | *_buffer = buffer; |
| 2325 | *_plane = plane; |
| 2326 | return 0; |
| 2327 | } |
| 2328 | } |
| 2329 | } |
| 2330 | |
| 2331 | return -EINVAL; |
| 2332 | } |
| 2333 | |
| 2334 | /** |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2335 | * vb2_expbuf() - Export a buffer as a file descriptor |
| 2336 | * @q: videobuf2 queue |
| 2337 | * @eb: export buffer structure passed from userspace to vidioc_expbuf |
| 2338 | * handler in driver |
| 2339 | * |
| 2340 | * The return values from this function are intended to be directly returned |
| 2341 | * from vidioc_expbuf handler in driver. |
| 2342 | */ |
| 2343 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb) |
| 2344 | { |
| 2345 | struct vb2_buffer *vb = NULL; |
| 2346 | struct vb2_plane *vb_plane; |
| 2347 | int ret; |
| 2348 | struct dma_buf *dbuf; |
| 2349 | |
| 2350 | if (q->memory != V4L2_MEMORY_MMAP) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2351 | dprintk(1, "queue is not currently set up for mmap\n"); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2352 | return -EINVAL; |
| 2353 | } |
| 2354 | |
| 2355 | if (!q->mem_ops->get_dmabuf) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2356 | dprintk(1, "queue does not support DMA buffer exporting\n"); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2357 | return -EINVAL; |
| 2358 | } |
| 2359 | |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame] | 2360 | if (eb->flags & ~(O_CLOEXEC | O_ACCMODE)) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2361 | 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] | 2362 | return -EINVAL; |
| 2363 | } |
| 2364 | |
| 2365 | if (eb->type != q->type) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2366 | dprintk(1, "invalid buffer type\n"); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2367 | return -EINVAL; |
| 2368 | } |
| 2369 | |
| 2370 | if (eb->index >= q->num_buffers) { |
| 2371 | dprintk(1, "buffer index out of range\n"); |
| 2372 | return -EINVAL; |
| 2373 | } |
| 2374 | |
| 2375 | vb = q->bufs[eb->index]; |
| 2376 | |
| 2377 | if (eb->plane >= vb->num_planes) { |
| 2378 | dprintk(1, "buffer plane out of range\n"); |
| 2379 | return -EINVAL; |
| 2380 | } |
| 2381 | |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2382 | if (vb2_fileio_is_active(q)) { |
| 2383 | dprintk(1, "expbuf: file io in progress\n"); |
| 2384 | return -EBUSY; |
| 2385 | } |
| 2386 | |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2387 | vb_plane = &vb->planes[eb->plane]; |
| 2388 | |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 2389 | 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] | 2390 | if (IS_ERR_OR_NULL(dbuf)) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2391 | dprintk(1, "failed to export buffer %d, plane %d\n", |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2392 | eb->index, eb->plane); |
| 2393 | return -EINVAL; |
| 2394 | } |
| 2395 | |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame] | 2396 | ret = dma_buf_fd(dbuf, eb->flags & ~O_ACCMODE); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 2397 | if (ret < 0) { |
| 2398 | dprintk(3, "buffer %d, plane %d failed to export (%d)\n", |
| 2399 | eb->index, eb->plane, ret); |
| 2400 | dma_buf_put(dbuf); |
| 2401 | return ret; |
| 2402 | } |
| 2403 | |
| 2404 | dprintk(3, "buffer %d, plane %d exported as %d descriptor\n", |
| 2405 | eb->index, eb->plane, ret); |
| 2406 | eb->fd = ret; |
| 2407 | |
| 2408 | return 0; |
| 2409 | } |
| 2410 | EXPORT_SYMBOL_GPL(vb2_expbuf); |
| 2411 | |
| 2412 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2413 | * vb2_mmap() - map video buffers into application address space |
| 2414 | * @q: videobuf2 queue |
| 2415 | * @vma: vma passed to the mmap file operation handler in the driver |
| 2416 | * |
| 2417 | * Should be called from mmap file operation handler of a driver. |
| 2418 | * This function maps one plane of one of the available video buffers to |
| 2419 | * userspace. To map whole video memory allocated on reqbufs, this function |
| 2420 | * has to be called once per each plane per each buffer previously allocated. |
| 2421 | * |
| 2422 | * When the userspace application calls mmap, it passes to it an offset returned |
| 2423 | * to it earlier by the means of vidioc_querybuf handler. That offset acts as |
| 2424 | * a "cookie", which is then used to identify the plane to be mapped. |
| 2425 | * This function finds a plane with a matching offset and a mapping is performed |
| 2426 | * by the means of a provided memory operation. |
| 2427 | * |
| 2428 | * The return values from this function are intended to be directly returned |
| 2429 | * from the mmap handler in driver. |
| 2430 | */ |
| 2431 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) |
| 2432 | { |
| 2433 | unsigned long off = vma->vm_pgoff << PAGE_SHIFT; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2434 | struct vb2_buffer *vb; |
Hans Verkuil | ce9c224 | 2014-04-17 03:17:08 -0300 | [diff] [blame] | 2435 | unsigned int buffer = 0, plane = 0; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2436 | int ret; |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 2437 | unsigned long length; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2438 | |
| 2439 | if (q->memory != V4L2_MEMORY_MMAP) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2440 | dprintk(1, "queue is not currently set up for mmap\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2441 | return -EINVAL; |
| 2442 | } |
| 2443 | |
| 2444 | /* |
| 2445 | * Check memory area access mode. |
| 2446 | */ |
| 2447 | if (!(vma->vm_flags & VM_SHARED)) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2448 | dprintk(1, "invalid vma flags, VM_SHARED needed\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2449 | return -EINVAL; |
| 2450 | } |
| 2451 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
| 2452 | if (!(vma->vm_flags & VM_WRITE)) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2453 | dprintk(1, "invalid vma flags, VM_WRITE needed\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2454 | return -EINVAL; |
| 2455 | } |
| 2456 | } else { |
| 2457 | if (!(vma->vm_flags & VM_READ)) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2458 | dprintk(1, "invalid vma flags, VM_READ needed\n"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2459 | return -EINVAL; |
| 2460 | } |
| 2461 | } |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2462 | if (vb2_fileio_is_active(q)) { |
| 2463 | dprintk(1, "mmap: file io in progress\n"); |
| 2464 | return -EBUSY; |
| 2465 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2466 | |
| 2467 | /* |
| 2468 | * Find the plane corresponding to the offset passed by userspace. |
| 2469 | */ |
| 2470 | ret = __find_plane_by_offset(q, off, &buffer, &plane); |
| 2471 | if (ret) |
| 2472 | return ret; |
| 2473 | |
| 2474 | vb = q->bufs[buffer]; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2475 | |
Mauro Carvalho Chehab | 7f84145 | 2013-04-19 07:18:01 -0300 | [diff] [blame] | 2476 | /* |
| 2477 | * MMAP requires page_aligned buffers. |
| 2478 | * The buffer length was page_aligned at __vb2_buf_mem_alloc(), |
| 2479 | * so, we need to do the same here. |
| 2480 | */ |
| 2481 | length = PAGE_ALIGN(vb->v4l2_planes[plane].length); |
| 2482 | if (length < (vma->vm_end - vma->vm_start)) { |
| 2483 | dprintk(1, |
| 2484 | "MMAP invalid, as it would overflow buffer length\n"); |
Seung-Woo Kim | 068a0df | 2013-04-11 23:57:57 -0300 | [diff] [blame] | 2485 | return -EINVAL; |
| 2486 | } |
| 2487 | |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 2488 | ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma); |
Hans Verkuil | a1d36d8 | 2014-03-17 09:54:21 -0300 | [diff] [blame] | 2489 | if (ret) |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2490 | return ret; |
| 2491 | |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2492 | dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2493 | return 0; |
| 2494 | } |
| 2495 | EXPORT_SYMBOL_GPL(vb2_mmap); |
| 2496 | |
Scott Jiang | 6f524ec | 2011-09-21 09:25:23 -0300 | [diff] [blame] | 2497 | #ifndef CONFIG_MMU |
| 2498 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, |
| 2499 | unsigned long addr, |
| 2500 | unsigned long len, |
| 2501 | unsigned long pgoff, |
| 2502 | unsigned long flags) |
| 2503 | { |
| 2504 | unsigned long off = pgoff << PAGE_SHIFT; |
| 2505 | struct vb2_buffer *vb; |
| 2506 | unsigned int buffer, plane; |
| 2507 | int ret; |
| 2508 | |
| 2509 | if (q->memory != V4L2_MEMORY_MMAP) { |
Hans Verkuil | 3050040 | 2014-04-07 09:13:22 -0300 | [diff] [blame] | 2510 | dprintk(1, "queue is not currently set up for mmap\n"); |
Scott Jiang | 6f524ec | 2011-09-21 09:25:23 -0300 | [diff] [blame] | 2511 | return -EINVAL; |
| 2512 | } |
| 2513 | |
| 2514 | /* |
| 2515 | * Find the plane corresponding to the offset passed by userspace. |
| 2516 | */ |
| 2517 | ret = __find_plane_by_offset(q, off, &buffer, &plane); |
| 2518 | if (ret) |
| 2519 | return ret; |
| 2520 | |
| 2521 | vb = q->bufs[buffer]; |
| 2522 | |
| 2523 | return (unsigned long)vb2_plane_vaddr(vb, plane); |
| 2524 | } |
| 2525 | EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); |
| 2526 | #endif |
| 2527 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2528 | static int __vb2_init_fileio(struct vb2_queue *q, int read); |
| 2529 | static int __vb2_cleanup_fileio(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2530 | |
| 2531 | /** |
| 2532 | * vb2_poll() - implements poll userspace operation |
| 2533 | * @q: videobuf2 queue |
| 2534 | * @file: file argument passed to the poll file operation handler |
| 2535 | * @wait: wait argument passed to the poll file operation handler |
| 2536 | * |
| 2537 | * This function implements poll file operation handler for a driver. |
| 2538 | * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will |
| 2539 | * be informed that the file descriptor of a video device is available for |
| 2540 | * reading. |
| 2541 | * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor |
| 2542 | * will be reported as available for writing. |
| 2543 | * |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2544 | * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any |
| 2545 | * pending events. |
| 2546 | * |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2547 | * The return values from this function are intended to be directly returned |
| 2548 | * from poll handler in driver. |
| 2549 | */ |
| 2550 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) |
| 2551 | { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2552 | struct video_device *vfd = video_devdata(file); |
Hans Verkuil | bf5c7cb | 2011-07-13 04:01:30 -0300 | [diff] [blame] | 2553 | unsigned long req_events = poll_requested_events(wait); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2554 | struct vb2_buffer *vb = NULL; |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2555 | unsigned int res = 0; |
| 2556 | unsigned long flags; |
| 2557 | |
| 2558 | if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
| 2559 | struct v4l2_fh *fh = file->private_data; |
| 2560 | |
| 2561 | if (v4l2_event_pending(fh)) |
| 2562 | res = POLLPRI; |
| 2563 | else if (req_events & POLLPRI) |
| 2564 | poll_wait(file, &fh->wait, wait); |
| 2565 | } |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2566 | |
Hans Verkuil | cd13823 | 2013-01-30 13:29:02 -0300 | [diff] [blame] | 2567 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM))) |
| 2568 | return res; |
| 2569 | if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM))) |
| 2570 | return res; |
| 2571 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2572 | /* |
Pawel Osciak | 4ffabdb | 2011-03-20 18:17:34 -0300 | [diff] [blame] | 2573 | * 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] | 2574 | */ |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2575 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
Hans Verkuil | bf5c7cb | 2011-07-13 04:01:30 -0300 | [diff] [blame] | 2576 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
| 2577 | (req_events & (POLLIN | POLLRDNORM))) { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2578 | if (__vb2_init_fileio(q, 1)) |
| 2579 | return res | POLLERR; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2580 | } |
Hans Verkuil | bf5c7cb | 2011-07-13 04:01:30 -0300 | [diff] [blame] | 2581 | if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
| 2582 | (req_events & (POLLOUT | POLLWRNORM))) { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2583 | if (__vb2_init_fileio(q, 0)) |
| 2584 | return res | POLLERR; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2585 | /* |
| 2586 | * Write to OUTPUT queue can be done immediately. |
| 2587 | */ |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2588 | return res | POLLOUT | POLLWRNORM; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2589 | } |
| 2590 | } |
| 2591 | |
| 2592 | /* |
Laurent Pinchart | 9241650 | 2014-06-03 17:41:06 -0300 | [diff] [blame] | 2593 | * There is nothing to wait for if no buffer has been queued and the |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 2594 | * queue isn't streaming, or if the error flag is set. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2595 | */ |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame] | 2596 | if ((list_empty(&q->queued_list) && !vb2_is_streaming(q)) || q->error) |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2597 | return res | POLLERR; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2598 | |
Hans Verkuil | 1612f20 | 2014-07-24 09:19:37 -0300 | [diff] [blame] | 2599 | /* |
| 2600 | * For output streams you can write as long as there are fewer buffers |
| 2601 | * queued than there are buffers available. |
| 2602 | */ |
| 2603 | if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) |
| 2604 | return res | POLLOUT | POLLWRNORM; |
| 2605 | |
Seung-Woo Kim | 412cb87 | 2013-05-20 23:47:29 -0300 | [diff] [blame] | 2606 | if (list_empty(&q->done_list)) |
| 2607 | poll_wait(file, &q->done_wq, wait); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2608 | |
| 2609 | /* |
| 2610 | * Take first buffer available for dequeuing. |
| 2611 | */ |
| 2612 | spin_lock_irqsave(&q->done_lock, flags); |
| 2613 | if (!list_empty(&q->done_list)) |
| 2614 | vb = list_first_entry(&q->done_list, struct vb2_buffer, |
| 2615 | done_entry); |
| 2616 | spin_unlock_irqrestore(&q->done_lock, flags); |
| 2617 | |
| 2618 | if (vb && (vb->state == VB2_BUF_STATE_DONE |
| 2619 | || vb->state == VB2_BUF_STATE_ERROR)) { |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2620 | return (V4L2_TYPE_IS_OUTPUT(q->type)) ? |
| 2621 | res | POLLOUT | POLLWRNORM : |
| 2622 | res | POLLIN | POLLRDNORM; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2623 | } |
Hans Verkuil | 95213ce | 2011-07-13 04:26:52 -0300 | [diff] [blame] | 2624 | return res; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2625 | } |
| 2626 | EXPORT_SYMBOL_GPL(vb2_poll); |
| 2627 | |
| 2628 | /** |
| 2629 | * vb2_queue_init() - initialize a videobuf2 queue |
| 2630 | * @q: videobuf2 queue; this structure should be allocated in driver |
| 2631 | * |
| 2632 | * The vb2_queue structure should be allocated by the driver. The driver is |
| 2633 | * responsible of clearing it's content and setting initial values for some |
| 2634 | * required entries before calling this function. |
| 2635 | * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer |
| 2636 | * to the struct vb2_queue description in include/media/videobuf2-core.h |
| 2637 | * for more information. |
| 2638 | */ |
| 2639 | int vb2_queue_init(struct vb2_queue *q) |
| 2640 | { |
Ezequiel Garcia | 896f38f | 2012-09-17 14:59:30 -0300 | [diff] [blame] | 2641 | /* |
| 2642 | * Sanity check |
| 2643 | */ |
| 2644 | if (WARN_ON(!q) || |
| 2645 | WARN_ON(!q->ops) || |
| 2646 | WARN_ON(!q->mem_ops) || |
| 2647 | WARN_ON(!q->type) || |
| 2648 | WARN_ON(!q->io_modes) || |
| 2649 | WARN_ON(!q->ops->queue_setup) || |
Kamil Debski | 6aa69f9 | 2013-01-25 06:29:57 -0300 | [diff] [blame] | 2650 | WARN_ON(!q->ops->buf_queue) || |
Sakari Ailus | 872484c | 2013-08-25 17:57:03 -0300 | [diff] [blame] | 2651 | WARN_ON(q->timestamp_flags & |
| 2652 | ~(V4L2_BUF_FLAG_TIMESTAMP_MASK | |
| 2653 | V4L2_BUF_FLAG_TSTAMP_SRC_MASK))) |
Ezequiel Garcia | 896f38f | 2012-09-17 14:59:30 -0300 | [diff] [blame] | 2654 | return -EINVAL; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2655 | |
Kamil Debski | 6aa69f9 | 2013-01-25 06:29:57 -0300 | [diff] [blame] | 2656 | /* Warn that the driver should choose an appropriate timestamp type */ |
Sakari Ailus | c57ff79 | 2014-03-01 10:28:02 -0300 | [diff] [blame] | 2657 | WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 2658 | V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN); |
Kamil Debski | 6aa69f9 | 2013-01-25 06:29:57 -0300 | [diff] [blame] | 2659 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2660 | INIT_LIST_HEAD(&q->queued_list); |
| 2661 | INIT_LIST_HEAD(&q->done_list); |
| 2662 | spin_lock_init(&q->done_lock); |
| 2663 | init_waitqueue_head(&q->done_wq); |
| 2664 | |
| 2665 | if (q->buf_struct_size == 0) |
| 2666 | q->buf_struct_size = sizeof(struct vb2_buffer); |
| 2667 | |
| 2668 | return 0; |
| 2669 | } |
| 2670 | EXPORT_SYMBOL_GPL(vb2_queue_init); |
| 2671 | |
| 2672 | /** |
| 2673 | * vb2_queue_release() - stop streaming, release the queue and free memory |
| 2674 | * @q: videobuf2 queue |
| 2675 | * |
| 2676 | * This function stops streaming and performs necessary clean ups, including |
| 2677 | * freeing video buffer memory. The driver is responsible for freeing |
| 2678 | * the vb2_queue structure itself. |
| 2679 | */ |
| 2680 | void vb2_queue_release(struct vb2_queue *q) |
| 2681 | { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2682 | __vb2_cleanup_fileio(q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2683 | __vb2_queue_cancel(q); |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 2684 | __vb2_queue_free(q, q->num_buffers); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 2685 | } |
| 2686 | EXPORT_SYMBOL_GPL(vb2_queue_release); |
| 2687 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2688 | /** |
| 2689 | * struct vb2_fileio_buf - buffer context used by file io emulator |
| 2690 | * |
| 2691 | * vb2 provides a compatibility layer and emulator of file io (read and |
| 2692 | * write) calls on top of streaming API. This structure is used for |
| 2693 | * tracking context related to the buffers. |
| 2694 | */ |
| 2695 | struct vb2_fileio_buf { |
| 2696 | void *vaddr; |
| 2697 | unsigned int size; |
| 2698 | unsigned int pos; |
| 2699 | unsigned int queued:1; |
| 2700 | }; |
| 2701 | |
| 2702 | /** |
| 2703 | * struct vb2_fileio_data - queue context used by file io emulator |
| 2704 | * |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2705 | * @cur_index: the index of the buffer currently being read from or |
| 2706 | * written to. If equal to q->num_buffers then a new buffer |
| 2707 | * must be dequeued. |
| 2708 | * @initial_index: in the read() case all buffers are queued up immediately |
| 2709 | * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles |
| 2710 | * buffers. However, in the write() case no buffers are initially |
| 2711 | * queued, instead whenever a buffer is full it is queued up by |
| 2712 | * __vb2_perform_fileio(). Only once all available buffers have |
| 2713 | * been queued up will __vb2_perform_fileio() start to dequeue |
| 2714 | * buffers. This means that initially __vb2_perform_fileio() |
| 2715 | * needs to know what buffer index to use when it is queuing up |
| 2716 | * the buffers for the first time. That initial index is stored |
| 2717 | * in this field. Once it is equal to q->num_buffers all |
| 2718 | * available buffers have been queued and __vb2_perform_fileio() |
| 2719 | * should start the normal dequeue/queue cycle. |
| 2720 | * |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2721 | * vb2 provides a compatibility layer and emulator of file io (read and |
| 2722 | * write) calls on top of streaming API. For proper operation it required |
| 2723 | * this structure to save the driver state between each call of the read |
| 2724 | * or write function. |
| 2725 | */ |
| 2726 | struct vb2_fileio_data { |
| 2727 | struct v4l2_requestbuffers req; |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 2728 | struct v4l2_plane p; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2729 | struct v4l2_buffer b; |
| 2730 | struct vb2_fileio_buf bufs[VIDEO_MAX_FRAME]; |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2731 | unsigned int cur_index; |
| 2732 | unsigned int initial_index; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2733 | unsigned int q_count; |
| 2734 | unsigned int dq_count; |
| 2735 | unsigned int flags; |
| 2736 | }; |
| 2737 | |
| 2738 | /** |
| 2739 | * __vb2_init_fileio() - initialize file io emulator |
| 2740 | * @q: videobuf2 queue |
| 2741 | * @read: mode selector (1 means read, 0 means write) |
| 2742 | */ |
| 2743 | static int __vb2_init_fileio(struct vb2_queue *q, int read) |
| 2744 | { |
| 2745 | struct vb2_fileio_data *fileio; |
| 2746 | int i, ret; |
| 2747 | unsigned int count = 0; |
| 2748 | |
| 2749 | /* |
| 2750 | * Sanity check |
| 2751 | */ |
Hans Verkuil | e4d2581 | 2014-02-03 11:22:45 -0300 | [diff] [blame] | 2752 | if (WARN_ON((read && !(q->io_modes & VB2_READ)) || |
| 2753 | (!read && !(q->io_modes & VB2_WRITE)))) |
| 2754 | return -EINVAL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2755 | |
| 2756 | /* |
| 2757 | * Check if device supports mapping buffers to kernel virtual space. |
| 2758 | */ |
| 2759 | if (!q->mem_ops->vaddr) |
| 2760 | return -EBUSY; |
| 2761 | |
| 2762 | /* |
| 2763 | * Check if streaming api has not been already activated. |
| 2764 | */ |
| 2765 | if (q->streaming || q->num_buffers > 0) |
| 2766 | return -EBUSY; |
| 2767 | |
| 2768 | /* |
| 2769 | * Start with count 1, driver can increase it in queue_setup() |
| 2770 | */ |
| 2771 | count = 1; |
| 2772 | |
| 2773 | dprintk(3, "setting up file io: mode %s, count %d, flags %08x\n", |
| 2774 | (read) ? "read" : "write", count, q->io_flags); |
| 2775 | |
| 2776 | fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL); |
| 2777 | if (fileio == NULL) |
| 2778 | return -ENOMEM; |
| 2779 | |
| 2780 | fileio->flags = q->io_flags; |
| 2781 | |
| 2782 | /* |
| 2783 | * Request buffers and use MMAP type to force driver |
| 2784 | * to allocate buffers by itself. |
| 2785 | */ |
| 2786 | fileio->req.count = count; |
| 2787 | fileio->req.memory = V4L2_MEMORY_MMAP; |
| 2788 | fileio->req.type = q->type; |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2789 | q->fileio = fileio; |
| 2790 | ret = __reqbufs(q, &fileio->req); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2791 | if (ret) |
| 2792 | goto err_kfree; |
| 2793 | |
| 2794 | /* |
| 2795 | * Check if plane_count is correct |
| 2796 | * (multiplane buffers are not supported). |
| 2797 | */ |
| 2798 | if (q->bufs[0]->num_planes != 1) { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2799 | ret = -EBUSY; |
| 2800 | goto err_reqbufs; |
| 2801 | } |
| 2802 | |
| 2803 | /* |
| 2804 | * Get kernel address of each buffer. |
| 2805 | */ |
| 2806 | for (i = 0; i < q->num_buffers; i++) { |
| 2807 | fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); |
Wei Yongjun | 5dd6946 | 2013-05-13 01:48:45 -0300 | [diff] [blame] | 2808 | if (fileio->bufs[i].vaddr == NULL) { |
| 2809 | ret = -EINVAL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2810 | goto err_reqbufs; |
Wei Yongjun | 5dd6946 | 2013-05-13 01:48:45 -0300 | [diff] [blame] | 2811 | } |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2812 | fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); |
| 2813 | } |
| 2814 | |
| 2815 | /* |
| 2816 | * Read mode requires pre queuing of all buffers. |
| 2817 | */ |
| 2818 | if (read) { |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 2819 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
| 2820 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2821 | /* |
| 2822 | * Queue all buffers. |
| 2823 | */ |
| 2824 | for (i = 0; i < q->num_buffers; i++) { |
| 2825 | struct v4l2_buffer *b = &fileio->b; |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 2826 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2827 | memset(b, 0, sizeof(*b)); |
| 2828 | b->type = q->type; |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 2829 | if (is_multiplanar) { |
| 2830 | memset(&fileio->p, 0, sizeof(fileio->p)); |
| 2831 | b->m.planes = &fileio->p; |
| 2832 | b->length = 1; |
| 2833 | } |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2834 | b->memory = q->memory; |
| 2835 | b->index = i; |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2836 | ret = vb2_internal_qbuf(q, b); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2837 | if (ret) |
| 2838 | goto err_reqbufs; |
| 2839 | fileio->bufs[i].queued = 1; |
| 2840 | } |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2841 | /* |
| 2842 | * All buffers have been queued, so mark that by setting |
| 2843 | * initial_index to q->num_buffers |
| 2844 | */ |
| 2845 | fileio->initial_index = q->num_buffers; |
| 2846 | fileio->cur_index = q->num_buffers; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2847 | } |
| 2848 | |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 2849 | /* |
| 2850 | * Start streaming. |
| 2851 | */ |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2852 | ret = vb2_internal_streamon(q, q->type); |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 2853 | if (ret) |
| 2854 | goto err_reqbufs; |
| 2855 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2856 | return ret; |
| 2857 | |
| 2858 | err_reqbufs: |
Hans de Goede | a67e172 | 2012-05-08 14:47:39 -0300 | [diff] [blame] | 2859 | fileio->req.count = 0; |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2860 | __reqbufs(q, &fileio->req); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2861 | |
| 2862 | err_kfree: |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2863 | q->fileio = NULL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2864 | kfree(fileio); |
| 2865 | return ret; |
| 2866 | } |
| 2867 | |
| 2868 | /** |
| 2869 | * __vb2_cleanup_fileio() - free resourced used by file io emulator |
| 2870 | * @q: videobuf2 queue |
| 2871 | */ |
| 2872 | static int __vb2_cleanup_fileio(struct vb2_queue *q) |
| 2873 | { |
| 2874 | struct vb2_fileio_data *fileio = q->fileio; |
| 2875 | |
| 2876 | if (fileio) { |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2877 | vb2_internal_streamoff(q, q->type); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2878 | q->fileio = NULL; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2879 | fileio->req.count = 0; |
| 2880 | vb2_reqbufs(q, &fileio->req); |
| 2881 | kfree(fileio); |
| 2882 | dprintk(3, "file io emulator closed\n"); |
| 2883 | } |
| 2884 | return 0; |
| 2885 | } |
| 2886 | |
| 2887 | /** |
| 2888 | * __vb2_perform_fileio() - perform a single file io (read or write) operation |
| 2889 | * @q: videobuf2 queue |
| 2890 | * @data: pointed to target userspace buffer |
| 2891 | * @count: number of bytes to read or write |
| 2892 | * @ppos: file handle position tracking pointer |
| 2893 | * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking) |
| 2894 | * @read: access mode selector (1 means read, 0 means write) |
| 2895 | */ |
| 2896 | static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count, |
| 2897 | loff_t *ppos, int nonblock, int read) |
| 2898 | { |
| 2899 | struct vb2_fileio_data *fileio; |
| 2900 | struct vb2_fileio_buf *buf; |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 2901 | bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type); |
Hans Verkuil | ebd7c50 | 2014-04-11 04:36:57 -0300 | [diff] [blame] | 2902 | /* |
| 2903 | * When using write() to write data to an output video node the vb2 core |
| 2904 | * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody |
| 2905 | * else is able to provide this information with the write() operation. |
| 2906 | */ |
| 2907 | bool set_timestamp = !read && |
| 2908 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 2909 | V4L2_BUF_FLAG_TIMESTAMP_COPY; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2910 | int ret, index; |
| 2911 | |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2912 | dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n", |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2913 | read ? "read" : "write", (long)*ppos, count, |
| 2914 | nonblock ? "non" : ""); |
| 2915 | |
| 2916 | if (!data) |
| 2917 | return -EINVAL; |
| 2918 | |
| 2919 | /* |
| 2920 | * Initialize emulator on first call. |
| 2921 | */ |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 2922 | if (!vb2_fileio_is_active(q)) { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2923 | ret = __vb2_init_fileio(q, read); |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2924 | dprintk(3, "vb2_init_fileio result: %d\n", ret); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2925 | if (ret) |
| 2926 | return ret; |
| 2927 | } |
| 2928 | fileio = q->fileio; |
| 2929 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2930 | /* |
| 2931 | * Check if we need to dequeue the buffer. |
| 2932 | */ |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2933 | index = fileio->cur_index; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2934 | if (index >= q->num_buffers) { |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2935 | /* |
| 2936 | * Call vb2_dqbuf to get buffer back. |
| 2937 | */ |
| 2938 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 2939 | fileio->b.type = q->type; |
| 2940 | fileio->b.memory = q->memory; |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 2941 | if (is_multiplanar) { |
| 2942 | memset(&fileio->p, 0, sizeof(fileio->p)); |
| 2943 | fileio->b.m.planes = &fileio->p; |
| 2944 | fileio->b.length = 1; |
| 2945 | } |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2946 | ret = vb2_internal_dqbuf(q, &fileio->b, nonblock); |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2947 | dprintk(5, "vb2_dqbuf result: %d\n", ret); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2948 | if (ret) |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2949 | return ret; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2950 | fileio->dq_count += 1; |
| 2951 | |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 2952 | fileio->cur_index = index = fileio->b.index; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2953 | buf = &fileio->bufs[index]; |
| 2954 | |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2955 | /* |
| 2956 | * Get number of bytes filled by the driver |
| 2957 | */ |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2958 | buf->pos = 0; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2959 | buf->queued = 0; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 2960 | buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) |
| 2961 | : vb2_plane_size(q->bufs[index], 0); |
| 2962 | } else { |
| 2963 | buf = &fileio->bufs[index]; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2964 | } |
| 2965 | |
| 2966 | /* |
| 2967 | * Limit count on last few bytes of the buffer. |
| 2968 | */ |
| 2969 | if (buf->pos + count > buf->size) { |
| 2970 | count = buf->size - buf->pos; |
Mauro Carvalho Chehab | 08b99e2 | 2011-01-11 17:12:34 -0300 | [diff] [blame] | 2971 | dprintk(5, "reducing read count: %zd\n", count); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2972 | } |
| 2973 | |
| 2974 | /* |
| 2975 | * Transfer data to userspace. |
| 2976 | */ |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2977 | dprintk(3, "copying %zd bytes - buffer %d, offset %u\n", |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2978 | count, index, buf->pos); |
| 2979 | if (read) |
| 2980 | ret = copy_to_user(data, buf->vaddr + buf->pos, count); |
| 2981 | else |
| 2982 | ret = copy_from_user(buf->vaddr + buf->pos, data, count); |
| 2983 | if (ret) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 2984 | dprintk(3, "error copying data\n"); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 2985 | return -EFAULT; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 2986 | } |
| 2987 | |
| 2988 | /* |
| 2989 | * Update counters. |
| 2990 | */ |
| 2991 | buf->pos += count; |
| 2992 | *ppos += count; |
| 2993 | |
| 2994 | /* |
| 2995 | * Queue next buffer if required. |
| 2996 | */ |
| 2997 | if (buf->pos == buf->size || |
| 2998 | (!read && (fileio->flags & VB2_FILEIO_WRITE_IMMEDIATELY))) { |
| 2999 | /* |
| 3000 | * Check if this is the last buffer to read. |
| 3001 | */ |
| 3002 | if (read && (fileio->flags & VB2_FILEIO_READ_ONCE) && |
| 3003 | fileio->dq_count == 1) { |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 3004 | dprintk(3, "read limit reached\n"); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3005 | return __vb2_cleanup_fileio(q); |
| 3006 | } |
| 3007 | |
| 3008 | /* |
| 3009 | * Call vb2_qbuf and give buffer to the driver. |
| 3010 | */ |
| 3011 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 3012 | fileio->b.type = q->type; |
| 3013 | fileio->b.memory = q->memory; |
| 3014 | fileio->b.index = index; |
| 3015 | fileio->b.bytesused = buf->pos; |
Hans Verkuil | 7bb6edd | 2014-04-11 04:40:03 -0300 | [diff] [blame] | 3016 | if (is_multiplanar) { |
| 3017 | memset(&fileio->p, 0, sizeof(fileio->p)); |
| 3018 | fileio->p.bytesused = buf->pos; |
| 3019 | fileio->b.m.planes = &fileio->p; |
| 3020 | fileio->b.length = 1; |
| 3021 | } |
Hans Verkuil | ebd7c50 | 2014-04-11 04:36:57 -0300 | [diff] [blame] | 3022 | if (set_timestamp) |
| 3023 | v4l2_get_timestamp(&fileio->b.timestamp); |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 3024 | ret = vb2_internal_qbuf(q, &fileio->b); |
Hans Verkuil | fd4354c | 2014-04-07 09:08:47 -0300 | [diff] [blame] | 3025 | dprintk(5, "vb2_dbuf result: %d\n", ret); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3026 | if (ret) |
Hans Verkuil | b2f2f04 | 2013-12-13 13:13:41 -0300 | [diff] [blame] | 3027 | return ret; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3028 | |
| 3029 | /* |
| 3030 | * Buffer has been queued, update the status |
| 3031 | */ |
| 3032 | buf->pos = 0; |
| 3033 | buf->queued = 1; |
Hans Verkuil | 88e2687 | 2013-12-13 13:13:45 -0300 | [diff] [blame] | 3034 | buf->size = vb2_plane_size(q->bufs[index], 0); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3035 | fileio->q_count += 1; |
Hans Verkuil | 4e5a4d8 | 2014-02-14 06:46:50 -0300 | [diff] [blame] | 3036 | /* |
| 3037 | * If we are queuing up buffers for the first time, then |
| 3038 | * increase initial_index by one. |
| 3039 | */ |
| 3040 | if (fileio->initial_index < q->num_buffers) |
| 3041 | fileio->initial_index++; |
| 3042 | /* |
| 3043 | * The next buffer to use is either a buffer that's going to be |
| 3044 | * queued for the first time (initial_index < q->num_buffers) |
| 3045 | * or it is equal to q->num_buffers, meaning that the next |
| 3046 | * time we need to dequeue a buffer since we've now queued up |
| 3047 | * all the 'first time' buffers. |
| 3048 | */ |
| 3049 | fileio->cur_index = fileio->initial_index; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3050 | } |
| 3051 | |
| 3052 | /* |
| 3053 | * Return proper number of bytes processed. |
| 3054 | */ |
| 3055 | if (ret == 0) |
| 3056 | ret = count; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3057 | return ret; |
| 3058 | } |
| 3059 | |
| 3060 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, |
| 3061 | loff_t *ppos, int nonblocking) |
| 3062 | { |
| 3063 | return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1); |
| 3064 | } |
| 3065 | EXPORT_SYMBOL_GPL(vb2_read); |
| 3066 | |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 3067 | 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] | 3068 | loff_t *ppos, int nonblocking) |
| 3069 | { |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 3070 | return __vb2_perform_fileio(q, (char __user *) data, count, |
| 3071 | ppos, nonblocking, 0); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 3072 | } |
| 3073 | EXPORT_SYMBOL_GPL(vb2_write); |
| 3074 | |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 3075 | struct vb2_threadio_data { |
| 3076 | struct task_struct *thread; |
| 3077 | vb2_thread_fnc fnc; |
| 3078 | void *priv; |
| 3079 | bool stop; |
| 3080 | }; |
| 3081 | |
| 3082 | static int vb2_thread(void *data) |
| 3083 | { |
| 3084 | struct vb2_queue *q = data; |
| 3085 | struct vb2_threadio_data *threadio = q->threadio; |
| 3086 | struct vb2_fileio_data *fileio = q->fileio; |
| 3087 | bool set_timestamp = false; |
| 3088 | int prequeue = 0; |
| 3089 | int index = 0; |
| 3090 | int ret = 0; |
| 3091 | |
| 3092 | if (V4L2_TYPE_IS_OUTPUT(q->type)) { |
| 3093 | prequeue = q->num_buffers; |
| 3094 | set_timestamp = |
| 3095 | (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) == |
| 3096 | V4L2_BUF_FLAG_TIMESTAMP_COPY; |
| 3097 | } |
| 3098 | |
| 3099 | set_freezable(); |
| 3100 | |
| 3101 | for (;;) { |
| 3102 | struct vb2_buffer *vb; |
| 3103 | |
| 3104 | /* |
| 3105 | * Call vb2_dqbuf to get buffer back. |
| 3106 | */ |
| 3107 | memset(&fileio->b, 0, sizeof(fileio->b)); |
| 3108 | fileio->b.type = q->type; |
| 3109 | fileio->b.memory = q->memory; |
| 3110 | if (prequeue) { |
| 3111 | fileio->b.index = index++; |
| 3112 | prequeue--; |
| 3113 | } else { |
| 3114 | call_void_qop(q, wait_finish, q); |
| 3115 | ret = vb2_internal_dqbuf(q, &fileio->b, 0); |
| 3116 | call_void_qop(q, wait_prepare, q); |
| 3117 | dprintk(5, "file io: vb2_dqbuf result: %d\n", ret); |
| 3118 | } |
| 3119 | if (threadio->stop) |
| 3120 | break; |
| 3121 | if (ret) |
| 3122 | break; |
| 3123 | try_to_freeze(); |
| 3124 | |
| 3125 | vb = q->bufs[fileio->b.index]; |
| 3126 | if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR)) |
| 3127 | ret = threadio->fnc(vb, threadio->priv); |
| 3128 | if (ret) |
| 3129 | break; |
| 3130 | call_void_qop(q, wait_finish, q); |
| 3131 | if (set_timestamp) |
| 3132 | v4l2_get_timestamp(&fileio->b.timestamp); |
| 3133 | ret = vb2_internal_qbuf(q, &fileio->b); |
| 3134 | call_void_qop(q, wait_prepare, q); |
| 3135 | if (ret) |
| 3136 | break; |
| 3137 | } |
| 3138 | |
| 3139 | /* Hmm, linux becomes *very* unhappy without this ... */ |
| 3140 | while (!kthread_should_stop()) { |
| 3141 | set_current_state(TASK_INTERRUPTIBLE); |
| 3142 | schedule(); |
| 3143 | } |
| 3144 | return 0; |
| 3145 | } |
| 3146 | |
| 3147 | /* |
| 3148 | * This function should not be used for anything else but the videobuf2-dvb |
| 3149 | * support. If you think you have another good use-case for this, then please |
| 3150 | * contact the linux-media mailinglist first. |
| 3151 | */ |
| 3152 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, |
| 3153 | const char *thread_name) |
| 3154 | { |
| 3155 | struct vb2_threadio_data *threadio; |
| 3156 | int ret = 0; |
| 3157 | |
| 3158 | if (q->threadio) |
| 3159 | return -EBUSY; |
| 3160 | if (vb2_is_busy(q)) |
| 3161 | return -EBUSY; |
| 3162 | if (WARN_ON(q->fileio)) |
| 3163 | return -EBUSY; |
| 3164 | |
| 3165 | threadio = kzalloc(sizeof(*threadio), GFP_KERNEL); |
| 3166 | if (threadio == NULL) |
| 3167 | return -ENOMEM; |
| 3168 | threadio->fnc = fnc; |
| 3169 | threadio->priv = priv; |
| 3170 | |
| 3171 | ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type)); |
| 3172 | dprintk(3, "file io: vb2_init_fileio result: %d\n", ret); |
| 3173 | if (ret) |
| 3174 | goto nomem; |
| 3175 | q->threadio = threadio; |
| 3176 | threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name); |
| 3177 | if (IS_ERR(threadio->thread)) { |
| 3178 | ret = PTR_ERR(threadio->thread); |
| 3179 | threadio->thread = NULL; |
| 3180 | goto nothread; |
| 3181 | } |
| 3182 | return 0; |
| 3183 | |
| 3184 | nothread: |
| 3185 | __vb2_cleanup_fileio(q); |
| 3186 | nomem: |
| 3187 | kfree(threadio); |
| 3188 | return ret; |
| 3189 | } |
| 3190 | EXPORT_SYMBOL_GPL(vb2_thread_start); |
| 3191 | |
| 3192 | int vb2_thread_stop(struct vb2_queue *q) |
| 3193 | { |
| 3194 | struct vb2_threadio_data *threadio = q->threadio; |
| 3195 | struct vb2_fileio_data *fileio = q->fileio; |
| 3196 | int err; |
| 3197 | |
| 3198 | if (threadio == NULL) |
| 3199 | return 0; |
| 3200 | call_void_qop(q, wait_finish, q); |
| 3201 | threadio->stop = true; |
| 3202 | vb2_internal_streamoff(q, q->type); |
| 3203 | call_void_qop(q, wait_prepare, q); |
| 3204 | q->fileio = NULL; |
| 3205 | fileio->req.count = 0; |
| 3206 | vb2_reqbufs(q, &fileio->req); |
| 3207 | kfree(fileio); |
| 3208 | err = kthread_stop(threadio->thread); |
| 3209 | threadio->thread = NULL; |
| 3210 | kfree(threadio); |
| 3211 | q->fileio = NULL; |
| 3212 | q->threadio = NULL; |
| 3213 | return err; |
| 3214 | } |
| 3215 | EXPORT_SYMBOL_GPL(vb2_thread_stop); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3216 | |
| 3217 | /* |
| 3218 | * The following functions are not part of the vb2 core API, but are helper |
| 3219 | * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations |
| 3220 | * and struct vb2_ops. |
| 3221 | * They contain boilerplate code that most if not all drivers have to do |
| 3222 | * and so they simplify the driver code. |
| 3223 | */ |
| 3224 | |
| 3225 | /* The queue is busy if there is a owner and you are not that owner. */ |
| 3226 | static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file) |
| 3227 | { |
| 3228 | return vdev->queue->owner && vdev->queue->owner != file->private_data; |
| 3229 | } |
| 3230 | |
| 3231 | /* vb2 ioctl helpers */ |
| 3232 | |
| 3233 | int vb2_ioctl_reqbufs(struct file *file, void *priv, |
| 3234 | struct v4l2_requestbuffers *p) |
| 3235 | { |
| 3236 | struct video_device *vdev = video_devdata(file); |
| 3237 | int res = __verify_memory_type(vdev->queue, p->memory, p->type); |
| 3238 | |
| 3239 | if (res) |
| 3240 | return res; |
| 3241 | if (vb2_queue_is_busy(vdev, file)) |
| 3242 | return -EBUSY; |
| 3243 | res = __reqbufs(vdev->queue, p); |
| 3244 | /* If count == 0, then the owner has released all buffers and he |
| 3245 | is no longer owner of the queue. Otherwise we have a new owner. */ |
| 3246 | if (res == 0) |
| 3247 | vdev->queue->owner = p->count ? file->private_data : NULL; |
| 3248 | return res; |
| 3249 | } |
| 3250 | EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs); |
| 3251 | |
| 3252 | int vb2_ioctl_create_bufs(struct file *file, void *priv, |
| 3253 | struct v4l2_create_buffers *p) |
| 3254 | { |
| 3255 | struct video_device *vdev = video_devdata(file); |
| 3256 | int res = __verify_memory_type(vdev->queue, p->memory, p->format.type); |
| 3257 | |
| 3258 | p->index = vdev->queue->num_buffers; |
| 3259 | /* If count == 0, then just check if memory and type are valid. |
| 3260 | Any -EBUSY result from __verify_memory_type can be mapped to 0. */ |
| 3261 | if (p->count == 0) |
| 3262 | return res != -EBUSY ? res : 0; |
| 3263 | if (res) |
| 3264 | return res; |
| 3265 | if (vb2_queue_is_busy(vdev, file)) |
| 3266 | return -EBUSY; |
| 3267 | res = __create_bufs(vdev->queue, p); |
| 3268 | if (res == 0) |
| 3269 | vdev->queue->owner = file->private_data; |
| 3270 | return res; |
| 3271 | } |
| 3272 | EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs); |
| 3273 | |
| 3274 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, |
| 3275 | struct v4l2_buffer *p) |
| 3276 | { |
| 3277 | struct video_device *vdev = video_devdata(file); |
| 3278 | |
| 3279 | if (vb2_queue_is_busy(vdev, file)) |
| 3280 | return -EBUSY; |
| 3281 | return vb2_prepare_buf(vdev->queue, p); |
| 3282 | } |
| 3283 | EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf); |
| 3284 | |
| 3285 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 3286 | { |
| 3287 | struct video_device *vdev = video_devdata(file); |
| 3288 | |
| 3289 | /* No need to call vb2_queue_is_busy(), anyone can query buffers. */ |
| 3290 | return vb2_querybuf(vdev->queue, p); |
| 3291 | } |
| 3292 | EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf); |
| 3293 | |
| 3294 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 3295 | { |
| 3296 | struct video_device *vdev = video_devdata(file); |
| 3297 | |
| 3298 | if (vb2_queue_is_busy(vdev, file)) |
| 3299 | return -EBUSY; |
| 3300 | return vb2_qbuf(vdev->queue, p); |
| 3301 | } |
| 3302 | EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf); |
| 3303 | |
| 3304 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p) |
| 3305 | { |
| 3306 | struct video_device *vdev = video_devdata(file); |
| 3307 | |
| 3308 | if (vb2_queue_is_busy(vdev, file)) |
| 3309 | return -EBUSY; |
| 3310 | return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK); |
| 3311 | } |
| 3312 | EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf); |
| 3313 | |
| 3314 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i) |
| 3315 | { |
| 3316 | struct video_device *vdev = video_devdata(file); |
| 3317 | |
| 3318 | if (vb2_queue_is_busy(vdev, file)) |
| 3319 | return -EBUSY; |
| 3320 | return vb2_streamon(vdev->queue, i); |
| 3321 | } |
| 3322 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamon); |
| 3323 | |
| 3324 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i) |
| 3325 | { |
| 3326 | struct video_device *vdev = video_devdata(file); |
| 3327 | |
| 3328 | if (vb2_queue_is_busy(vdev, file)) |
| 3329 | return -EBUSY; |
| 3330 | return vb2_streamoff(vdev->queue, i); |
| 3331 | } |
| 3332 | EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff); |
| 3333 | |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 3334 | int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p) |
| 3335 | { |
| 3336 | struct video_device *vdev = video_devdata(file); |
| 3337 | |
| 3338 | if (vb2_queue_is_busy(vdev, file)) |
| 3339 | return -EBUSY; |
| 3340 | return vb2_expbuf(vdev->queue, p); |
| 3341 | } |
| 3342 | EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf); |
| 3343 | |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3344 | /* v4l2_file_operations helpers */ |
| 3345 | |
| 3346 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma) |
| 3347 | { |
| 3348 | struct video_device *vdev = video_devdata(file); |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3349 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 3350 | int err; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3351 | |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3352 | if (lock && mutex_lock_interruptible(lock)) |
| 3353 | return -ERESTARTSYS; |
| 3354 | err = vb2_mmap(vdev->queue, vma); |
| 3355 | if (lock) |
| 3356 | mutex_unlock(lock); |
| 3357 | return err; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3358 | } |
| 3359 | EXPORT_SYMBOL_GPL(vb2_fop_mmap); |
| 3360 | |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3361 | int _vb2_fop_release(struct file *file, struct mutex *lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3362 | { |
| 3363 | struct video_device *vdev = video_devdata(file); |
| 3364 | |
| 3365 | if (file->private_data == vdev->queue->owner) { |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3366 | if (lock) |
| 3367 | mutex_lock(lock); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3368 | vb2_queue_release(vdev->queue); |
| 3369 | vdev->queue->owner = NULL; |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3370 | if (lock) |
| 3371 | mutex_unlock(lock); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3372 | } |
| 3373 | return v4l2_fh_release(file); |
| 3374 | } |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 3375 | EXPORT_SYMBOL_GPL(_vb2_fop_release); |
| 3376 | |
| 3377 | int vb2_fop_release(struct file *file) |
| 3378 | { |
| 3379 | struct video_device *vdev = video_devdata(file); |
| 3380 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 3381 | |
| 3382 | return _vb2_fop_release(file, lock); |
| 3383 | } |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3384 | EXPORT_SYMBOL_GPL(vb2_fop_release); |
| 3385 | |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 3386 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3387 | size_t count, loff_t *ppos) |
| 3388 | { |
| 3389 | struct video_device *vdev = video_devdata(file); |
| 3390 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3391 | int err = -EBUSY; |
| 3392 | |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3393 | if (lock && mutex_lock_interruptible(lock)) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3394 | return -ERESTARTSYS; |
| 3395 | if (vb2_queue_is_busy(vdev, file)) |
| 3396 | goto exit; |
| 3397 | err = vb2_write(vdev->queue, buf, count, ppos, |
| 3398 | file->f_flags & O_NONBLOCK); |
Hans Verkuil | 8c82c75 | 2012-09-07 12:50:02 -0300 | [diff] [blame] | 3399 | if (vdev->queue->fileio) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3400 | vdev->queue->owner = file->private_data; |
| 3401 | exit: |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3402 | if (lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3403 | mutex_unlock(lock); |
| 3404 | return err; |
| 3405 | } |
| 3406 | EXPORT_SYMBOL_GPL(vb2_fop_write); |
| 3407 | |
| 3408 | ssize_t vb2_fop_read(struct file *file, char __user *buf, |
| 3409 | size_t count, loff_t *ppos) |
| 3410 | { |
| 3411 | struct video_device *vdev = video_devdata(file); |
| 3412 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3413 | int err = -EBUSY; |
| 3414 | |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3415 | if (lock && mutex_lock_interruptible(lock)) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3416 | return -ERESTARTSYS; |
| 3417 | if (vb2_queue_is_busy(vdev, file)) |
| 3418 | goto exit; |
| 3419 | err = vb2_read(vdev->queue, buf, count, ppos, |
| 3420 | file->f_flags & O_NONBLOCK); |
Hans Verkuil | 8c82c75 | 2012-09-07 12:50:02 -0300 | [diff] [blame] | 3421 | if (vdev->queue->fileio) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3422 | vdev->queue->owner = file->private_data; |
| 3423 | exit: |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3424 | if (lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3425 | mutex_unlock(lock); |
| 3426 | return err; |
| 3427 | } |
| 3428 | EXPORT_SYMBOL_GPL(vb2_fop_read); |
| 3429 | |
| 3430 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait) |
| 3431 | { |
| 3432 | struct video_device *vdev = video_devdata(file); |
| 3433 | struct vb2_queue *q = vdev->queue; |
| 3434 | struct mutex *lock = q->lock ? q->lock : vdev->lock; |
| 3435 | unsigned long req_events = poll_requested_events(wait); |
| 3436 | unsigned res; |
| 3437 | void *fileio; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3438 | bool must_lock = false; |
| 3439 | |
| 3440 | /* Try to be smart: only lock if polling might start fileio, |
| 3441 | otherwise locking will only introduce unwanted delays. */ |
Hans Verkuil | 74753cffa | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 3442 | if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) { |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3443 | if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && |
| 3444 | (req_events & (POLLIN | POLLRDNORM))) |
| 3445 | must_lock = true; |
| 3446 | else if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && |
| 3447 | (req_events & (POLLOUT | POLLWRNORM))) |
| 3448 | must_lock = true; |
| 3449 | } |
| 3450 | |
| 3451 | /* If locking is needed, but this helper doesn't know how, then you |
| 3452 | shouldn't be using this helper but you should write your own. */ |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3453 | WARN_ON(must_lock && !lock); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3454 | |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3455 | if (must_lock && lock && mutex_lock_interruptible(lock)) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3456 | return POLLERR; |
| 3457 | |
| 3458 | fileio = q->fileio; |
| 3459 | |
| 3460 | res = vb2_poll(vdev->queue, file, wait); |
| 3461 | |
| 3462 | /* If fileio was started, then we have a new queue owner. */ |
| 3463 | if (must_lock && !fileio && q->fileio) |
| 3464 | q->owner = file->private_data; |
Hans Verkuil | cf53373 | 2012-07-31 04:02:25 -0300 | [diff] [blame] | 3465 | if (must_lock && lock) |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3466 | mutex_unlock(lock); |
| 3467 | return res; |
| 3468 | } |
| 3469 | EXPORT_SYMBOL_GPL(vb2_fop_poll); |
| 3470 | |
| 3471 | #ifndef CONFIG_MMU |
| 3472 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, |
| 3473 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 3474 | { |
| 3475 | struct video_device *vdev = video_devdata(file); |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3476 | struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock; |
| 3477 | int ret; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3478 | |
Laurent Pinchart | 8a90f1a | 2013-08-02 13:55:21 -0300 | [diff] [blame] | 3479 | if (lock && mutex_lock_interruptible(lock)) |
| 3480 | return -ERESTARTSYS; |
| 3481 | ret = vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags); |
| 3482 | if (lock) |
| 3483 | mutex_unlock(lock); |
| 3484 | return ret; |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 3485 | } |
| 3486 | EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area); |
| 3487 | #endif |
| 3488 | |
| 3489 | /* vb2_ops helpers. Only use if vq->lock is non-NULL. */ |
| 3490 | |
| 3491 | void vb2_ops_wait_prepare(struct vb2_queue *vq) |
| 3492 | { |
| 3493 | mutex_unlock(vq->lock); |
| 3494 | } |
| 3495 | EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare); |
| 3496 | |
| 3497 | void vb2_ops_wait_finish(struct vb2_queue *vq) |
| 3498 | { |
| 3499 | mutex_lock(vq->lock); |
| 3500 | } |
| 3501 | EXPORT_SYMBOL_GPL(vb2_ops_wait_finish); |
| 3502 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 3503 | MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
Pawel Osciak | 9507208 | 2011-03-13 15:23:32 -0300 | [diff] [blame] | 3504 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski"); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 3505 | MODULE_LICENSE("GPL"); |