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