drivers/media/dvb-core/dvb_vb2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * dvb-vb2.c - dvb-vb2
   4  *
   5  * Copyright (C) 2015 Samsung Electronics
   6  *
   7  * Author: jh1009.sung@samsung.com
   8  */
   9
  10 #include <linux/err.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/mm.h>
  14
  15 #include <media/dvbdev.h>
  16 #include <media/dvb_vb2.h>
  17
  18 #define DVB_V2_MAX_SIZE         (4096 * 188)
  19
  20 static int vb2_debug;
  21 module_param(vb2_debug, int, 0644);
  22
  23 #define dprintk(level, fmt, arg...)                                           \
  24         do {                                                                  \
  25                 if (vb2_debug >= level)                                       \
  26                         pr_info("vb2: %s: " fmt, __func__, ## arg); \
  27         } while (0)
  28
  29 static int _queue_setup(struct vb2_queue *vq,
  30                         unsigned int *nbuffers, unsigned int *nplanes,
  31                         unsigned int sizes[], struct device *alloc_devs[])
  32 {
  33         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
  34
  35         ctx->buf_cnt = *nbuffers;
  36         *nplanes = 1;
  37         sizes[0] = ctx->buf_siz;
  38
  39         /*
  40          * videobuf2-vmalloc allocator is context-less so no need to set
  41          * alloc_ctxs array.
  42          */
  43
  44         dprintk(3, "[%s] count=%d, size=%d\n", ctx->name,
  45                 *nbuffers, sizes[0]);
  46
  47         return 0;
  48 }
  49
  50 static int _buffer_prepare(struct vb2_buffer *vb)
  51 {
  52         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  53         unsigned long size = ctx->buf_siz;
  54
  55         if (vb2_plane_size(vb, 0) < size) {
  56                 dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n",
  57                         ctx->name, vb2_plane_size(vb, 0), size);
  58                 return -EINVAL;
  59         }
  60
  61         vb2_set_plane_payload(vb, 0, size);
  62         dprintk(3, "[%s]\n", ctx->name);
  63
  64         return 0;
  65 }
  66
  67 static void _buffer_queue(struct vb2_buffer *vb)
  68 {
  69         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  70         struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb);
  71         unsigned long flags = 0;
  72
  73         spin_lock_irqsave(&ctx->slock, flags);
  74         list_add_tail(&buf->list, &ctx->dvb_q);
  75         spin_unlock_irqrestore(&ctx->slock, flags);
  76
  77         dprintk(3, "[%s]\n", ctx->name);
  78 }
  79
  80 static int _start_streaming(struct vb2_queue *vq, unsigned int count)
  81 {
  82         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
  83
  84         dprintk(3, "[%s] count=%d\n", ctx->name, count);
  85         return 0;
  86 }
  87
  88 static void _stop_streaming(struct vb2_queue *vq)
  89 {
  90         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
  91         struct dvb_buffer *buf;
  92         unsigned long flags = 0;
  93
  94         dprintk(3, "[%s]\n", ctx->name);
  95
  96         spin_lock_irqsave(&ctx->slock, flags);
  97         while (!list_empty(&ctx->dvb_q)) {
  98                 buf = list_entry(ctx->dvb_q.next,
  99                                  struct dvb_buffer, list);
 100                 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
 101                 list_del(&buf->list);
 102         }
 103         spin_unlock_irqrestore(&ctx->slock, flags);
 104 }
 105
 106 static void _dmxdev_lock(struct vb2_queue *vq)
 107 {
 108         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
 109
 110         mutex_lock(&ctx->mutex);
 111         dprintk(3, "[%s]\n", ctx->name);
 112 }
 113
 114 static void _dmxdev_unlock(struct vb2_queue *vq)
 115 {
 116         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
 117
 118         if (mutex_is_locked(&ctx->mutex))
 119                 mutex_unlock(&ctx->mutex);
 120         dprintk(3, "[%s]\n", ctx->name);
 121 }
 122
 123 static const struct vb2_ops dvb_vb2_qops = {
 124         .queue_setup            = _queue_setup,
 125         .buf_prepare            = _buffer_prepare,
 126         .buf_queue              = _buffer_queue,
 127         .start_streaming        = _start_streaming,
 128         .stop_streaming         = _stop_streaming,
 129         .wait_prepare           = _dmxdev_unlock,
 130         .wait_finish            = _dmxdev_lock,
 131 };
 132
 133 static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb)
 134 {
 135         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 136         struct dmx_buffer *b = pb;
 137
 138         b->index = vb->index;
 139         b->length = vb->planes[0].length;
 140         b->bytesused = vb->planes[0].bytesused;
 141         b->offset = vb->planes[0].m.offset;
 142         dprintk(3, "[%s]\n", ctx->name);
 143 }
 144
 145 static int _fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes)
 146 {
 147         struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 148
 149         planes[0].bytesused = 0;
 150         dprintk(3, "[%s]\n", ctx->name);
 151
 152         return 0;
 153 }
 154
 155 static const struct vb2_buf_ops dvb_vb2_buf_ops = {
 156         .fill_user_buffer       = _fill_dmx_buffer,
 157         .fill_vb2_buffer        = _fill_vb2_buffer,
 158 };
 159
 160 /*
 161  * Videobuf operations
 162  */
 163 int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
 164 {
 165         struct vb2_queue *q = &ctx->vb_q;
 166         int ret;
 167
 168         memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
 169         q->type = DVB_BUF_TYPE_CAPTURE;
 170         /**only mmap is supported currently*/
 171         q->io_modes = VB2_MMAP;
 172         q->drv_priv = ctx;
 173         q->buf_struct_size = sizeof(struct dvb_buffer);
 174         q->min_queued_buffers = 1;
 175         q->ops = &dvb_vb2_qops;
 176         q->mem_ops = &vb2_vmalloc_memops;
 177         q->buf_ops = &dvb_vb2_buf_ops;
 178         ret = vb2_core_queue_init(q);
 179         if (ret) {
 180                 ctx->state = DVB_VB2_STATE_NONE;
 181                 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
 182                 return ret;
 183         }
 184
 185         mutex_init(&ctx->mutex);
 186         spin_lock_init(&ctx->slock);
 187         INIT_LIST_HEAD(&ctx->dvb_q);
 188
 189         strscpy(ctx->name, name, DVB_VB2_NAME_MAX);
 190         ctx->nonblocking = nonblocking;
 191         ctx->state = DVB_VB2_STATE_INIT;
 192
 193         dprintk(3, "[%s]\n", ctx->name);
 194
 195         return 0;
 196 }
 197
 198 int dvb_vb2_release(struct dvb_vb2_ctx *ctx)
 199 {
 200         struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
 201
 202         if (ctx->state & DVB_VB2_STATE_INIT)
 203                 vb2_core_queue_release(q);
 204
 205         ctx->state = DVB_VB2_STATE_NONE;
 206         dprintk(3, "[%s]\n", ctx->name);
 207
 208         return 0;
 209 }
 210
 211 int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx)
 212 {
 213         struct vb2_queue *q = &ctx->vb_q;
 214         int ret;
 215
 216         ret = vb2_core_streamon(q, q->type);
 217         if (ret) {
 218                 ctx->state = DVB_VB2_STATE_NONE;
 219                 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
 220                 return ret;
 221         }
 222         ctx->state |= DVB_VB2_STATE_STREAMON;
 223         dprintk(3, "[%s]\n", ctx->name);
 224
 225         return 0;
 226 }
 227
 228 int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx)
 229 {
 230         struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
 231         int ret;
 232
 233         ctx->state &= ~DVB_VB2_STATE_STREAMON;
 234         ret = vb2_core_streamoff(q, q->type);
 235         if (ret) {
 236                 ctx->state = DVB_VB2_STATE_NONE;
 237                 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
 238                 return ret;
 239         }
 240         dprintk(3, "[%s]\n", ctx->name);
 241
 242         return 0;
 243 }
 244
 245 int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx)
 246 {
 247         return (ctx->state & DVB_VB2_STATE_STREAMON);
 248 }
 249
 250 int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
 251                         const unsigned char *src, int len,
 252                         enum dmx_buffer_flags *buffer_flags)
 253 {
 254         unsigned long flags = 0;
 255         void *vbuf = NULL;
 256         int todo = len;
 257         unsigned char *psrc = (unsigned char *)src;
 258         int ll = 0;
 259
 260         /*
 261          * normal case: This func is called twice from demux driver
 262          * one with valid src pointer, second time with NULL pointer
 263          */
 264         if (!src || !len)
 265                 return 0;
 266         spin_lock_irqsave(&ctx->slock, flags);
 267         if (buffer_flags && *buffer_flags) {
 268                 ctx->flags |= *buffer_flags;
 269                 *buffer_flags = 0;
 270         }
 271         while (todo) {
 272                 if (!ctx->buf) {
 273                         if (list_empty(&ctx->dvb_q)) {
 274                                 dprintk(3, "[%s] Buffer overflow!!!\n",
 275                                         ctx->name);
 276                                 break;
 277                         }
 278
 279                         ctx->buf = list_entry(ctx->dvb_q.next,
 280                                               struct dvb_buffer, list);
 281                         ctx->remain = vb2_plane_size(&ctx->buf->vb, 0);
 282                         ctx->offset = 0;
 283                 }
 284
 285                 if (!dvb_vb2_is_streaming(ctx)) {
 286                         vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR);
 287                         list_del(&ctx->buf->list);
 288                         ctx->buf = NULL;
 289                         break;
 290                 }
 291
 292                 /* Fill buffer */
 293                 ll = min(todo, ctx->remain);
 294                 vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0);
 295                 memcpy(vbuf + ctx->offset, psrc, ll);
 296                 todo -= ll;
 297                 psrc += ll;
 298
 299                 ctx->remain -= ll;
 300                 ctx->offset += ll;
 301
 302                 if (ctx->remain == 0) {
 303                         vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
 304                         list_del(&ctx->buf->list);
 305                         ctx->buf = NULL;
 306                 }
 307         }
 308
 309         if (ctx->nonblocking && ctx->buf) {
 310                 vb2_set_plane_payload(&ctx->buf->vb, 0, ll);
 311                 vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
 312                 list_del(&ctx->buf->list);
 313                 ctx->buf = NULL;
 314         }
 315         spin_unlock_irqrestore(&ctx->slock, flags);
 316
 317         if (todo)
 318                 dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo);
 319         else
 320                 dprintk(3, "[%s]\n", ctx->name);
 321
 322         dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo);
 323         return (len - todo);
 324 }
 325
 326 int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
 327 {
 328         int ret;
 329
 330         /* Adjust size to a sane value */
 331         if (req->size > DVB_V2_MAX_SIZE)
 332                 req->size = DVB_V2_MAX_SIZE;
 333
 334         /* FIXME: round req->size to a 188 or 204 multiple */
 335
 336         ctx->buf_siz = req->size;
 337         ctx->buf_cnt = req->count;
 338         ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count);
 339         if (ret) {
 340                 ctx->state = DVB_VB2_STATE_NONE;
 341                 dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name,
 342                         ctx->buf_cnt, ctx->buf_siz, ret);
 343                 return ret;
 344         }
 345         ctx->state |= DVB_VB2_STATE_REQBUFS;
 346         dprintk(3, "[%s] count=%d size=%d\n", ctx->name,
 347                 ctx->buf_cnt, ctx->buf_siz);
 348
 349         return 0;
 350 }
 351
 352 int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 353 {
 354         struct vb2_queue *q = &ctx->vb_q;
 355         struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
 356
 357         if (!vb2) {
 358                 dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 359                 return -EINVAL;
 360         }
 361         vb2_core_querybuf(&ctx->vb_q, vb2, b);
 362         dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
 363         return 0;
 364 }
 365
 366 int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
 367 {
 368         struct vb2_queue *q = &ctx->vb_q;
 369         struct vb2_buffer *vb2 = vb2_get_buffer(q, exp->index);
 370         int ret;
 371
 372         if (!vb2) {
 373                 dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 374                 return -EINVAL;
 375         }
 376
 377         ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, vb2,
 378                               0, exp->flags);
 379         if (ret) {
 380                 dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
 381                         exp->index, ret);
 382                 return ret;
 383         }
 384         dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd);
 385
 386         return 0;
 387 }
 388
 389 int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 390 {
 391         struct vb2_queue *q = &ctx->vb_q;
 392         struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
 393         int ret;
 394
 395         if (!vb2) {
 396                 dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 397                 return -EINVAL;
 398         }
 399         ret = vb2_core_qbuf(&ctx->vb_q, vb2, b, NULL);
 400         if (ret) {
 401                 dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
 402                         b->index, ret);
 403                 return ret;
 404         }
 405         dprintk(5, "[%s] index=%d\n", ctx->name, b->index);
 406
 407         return 0;
 408 }
 409
 410 int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 411 {
 412         unsigned long flags;
 413         int ret;
 414
 415         ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking);
 416         if (ret) {
 417                 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
 418                 return ret;
 419         }
 420
 421         spin_lock_irqsave(&ctx->slock, flags);
 422         b->count = ctx->count++;
 423         b->flags = ctx->flags;
 424         ctx->flags = 0;
 425         spin_unlock_irqrestore(&ctx->slock, flags);
 426
 427         dprintk(5, "[%s] index=%d, count=%d, flags=%d\n",
 428                 ctx->name, b->index, ctx->count, b->flags);
 429
 430
 431         return 0;
 432 }
 433
 434 int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma)
 435 {
 436         int ret;
 437
 438         ret = vb2_mmap(&ctx->vb_q, vma);
 439         if (ret) {
 440                 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
 441                 return ret;
 442         }
 443         dprintk(3, "[%s] ret=%d\n", ctx->name, ret);
 444
 445         return 0;
 446 }
 447
 448 __poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
 449                       poll_table *wait)
 450 {
 451         dprintk(3, "[%s]\n", ctx->name);
 452         return vb2_core_poll(&ctx->vb_q, file, wait);
 453 }
 454