Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * generic helper functions for video4linux capture buffers, to handle |
| 4 | * memory management and PCI DMA. Right now bttv + saa7134 use it. |
| 5 | * |
| 6 | * The functions expect the hardware being able to scatter gatter |
| 7 | * (i.e. the buffers are not linear in physical memory, but fragmented |
| 8 | * into PAGE_SIZE chunks). They also assume the driver does not need |
| 9 | * to touch the video data (thus it is probably not useful for USB 1.1 |
| 10 | * as data often must be uncompressed by the drivers). |
| 11 | * |
| 12 | * (c) 2001-2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs] |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/moduleparam.h> |
| 23 | #include <linux/vmalloc.h> |
| 24 | #include <linux/pagemap.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/pci.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <asm/page.h> |
| 29 | #include <asm/pgtable.h> |
| 30 | |
| 31 | #include <media/video-buf.h> |
| 32 | |
| 33 | #define MAGIC_DMABUF 0x19721112 |
| 34 | #define MAGIC_BUFFER 0x20040302 |
| 35 | #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \ |
| 36 | { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); } |
| 37 | |
| 38 | static int debug = 0; |
| 39 | module_param(debug, int, 0644); |
| 40 | |
| 41 | MODULE_DESCRIPTION("helper module to manage video4linux pci dma buffers"); |
| 42 | MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]"); |
| 43 | MODULE_LICENSE("GPL"); |
| 44 | |
| 45 | #define dprintk(level, fmt, arg...) if (debug >= level) \ |
| 46 | printk(KERN_DEBUG "vbuf: " fmt , ## arg) |
| 47 | |
| 48 | struct scatterlist* |
| 49 | videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages) |
| 50 | { |
| 51 | struct scatterlist *sglist; |
| 52 | struct page *pg; |
| 53 | int i; |
| 54 | |
Panagiotis Issaris | 7408187 | 2006-01-11 19:40:56 -0200 | [diff] [blame^] | 55 | sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | if (NULL == sglist) |
| 57 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
| 59 | pg = vmalloc_to_page(virt); |
| 60 | if (NULL == pg) |
| 61 | goto err; |
| 62 | if (PageHighMem(pg)) |
| 63 | BUG(); |
| 64 | sglist[i].page = pg; |
| 65 | sglist[i].length = PAGE_SIZE; |
| 66 | } |
| 67 | return sglist; |
| 68 | |
| 69 | err: |
| 70 | kfree(sglist); |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | struct scatterlist* |
| 75 | videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset) |
| 76 | { |
| 77 | struct scatterlist *sglist; |
| 78 | int i = 0; |
| 79 | |
| 80 | if (NULL == pages[0]) |
| 81 | return NULL; |
Panagiotis Issaris | 7408187 | 2006-01-11 19:40:56 -0200 | [diff] [blame^] | 82 | sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | if (NULL == sglist) |
| 84 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | if (NULL == pages[0]) |
| 87 | goto nopage; |
| 88 | if (PageHighMem(pages[0])) |
| 89 | /* DMA to highmem pages might not work */ |
| 90 | goto highmem; |
| 91 | sglist[0].page = pages[0]; |
| 92 | sglist[0].offset = offset; |
| 93 | sglist[0].length = PAGE_SIZE - offset; |
| 94 | for (i = 1; i < nr_pages; i++) { |
| 95 | if (NULL == pages[i]) |
| 96 | goto nopage; |
| 97 | if (PageHighMem(pages[i])) |
| 98 | goto highmem; |
| 99 | sglist[i].page = pages[i]; |
| 100 | sglist[i].length = PAGE_SIZE; |
| 101 | } |
| 102 | return sglist; |
| 103 | |
| 104 | nopage: |
| 105 | dprintk(2,"sgl: oops - no page\n"); |
| 106 | kfree(sglist); |
| 107 | return NULL; |
| 108 | |
| 109 | highmem: |
| 110 | dprintk(2,"sgl: oops - highmem page\n"); |
| 111 | kfree(sglist); |
| 112 | return NULL; |
| 113 | } |
| 114 | |
| 115 | /* --------------------------------------------------------------------- */ |
| 116 | |
| 117 | void videobuf_dma_init(struct videobuf_dmabuf *dma) |
| 118 | { |
| 119 | memset(dma,0,sizeof(*dma)); |
| 120 | dma->magic = MAGIC_DMABUF; |
| 121 | } |
| 122 | |
| 123 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
| 124 | unsigned long data, unsigned long size) |
| 125 | { |
| 126 | unsigned long first,last; |
| 127 | int err, rw = 0; |
| 128 | |
| 129 | dma->direction = direction; |
| 130 | switch (dma->direction) { |
| 131 | case PCI_DMA_FROMDEVICE: rw = READ; break; |
| 132 | case PCI_DMA_TODEVICE: rw = WRITE; break; |
| 133 | default: BUG(); |
| 134 | } |
| 135 | |
| 136 | first = (data & PAGE_MASK) >> PAGE_SHIFT; |
| 137 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; |
| 138 | dma->offset = data & ~PAGE_MASK; |
| 139 | dma->nr_pages = last-first+1; |
| 140 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*), |
| 141 | GFP_KERNEL); |
| 142 | if (NULL == dma->pages) |
| 143 | return -ENOMEM; |
| 144 | dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n", |
| 145 | data,size,dma->nr_pages); |
| 146 | |
| 147 | down_read(¤t->mm->mmap_sem); |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 148 | err = get_user_pages(current,current->mm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | data & PAGE_MASK, dma->nr_pages, |
| 150 | rw == READ, 1, /* force */ |
| 151 | dma->pages, NULL); |
| 152 | up_read(¤t->mm->mmap_sem); |
| 153 | if (err != dma->nr_pages) { |
| 154 | dma->nr_pages = (err >= 0) ? err : 0; |
| 155 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); |
| 156 | return err < 0 ? err : -EINVAL; |
| 157 | } |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
| 162 | int nr_pages) |
| 163 | { |
| 164 | dprintk(1,"init kernel [%d pages]\n",nr_pages); |
| 165 | dma->direction = direction; |
| 166 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); |
| 167 | if (NULL == dma->vmalloc) { |
| 168 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); |
| 169 | return -ENOMEM; |
| 170 | } |
| 171 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); |
| 172 | dma->nr_pages = nr_pages; |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, |
| 177 | dma_addr_t addr, int nr_pages) |
| 178 | { |
| 179 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", |
| 180 | nr_pages,(unsigned long)addr); |
| 181 | dma->direction = direction; |
| 182 | if (0 == addr) |
| 183 | return -EINVAL; |
| 184 | |
| 185 | dma->bus_addr = addr; |
| 186 | dma->nr_pages = nr_pages; |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | int videobuf_dma_pci_map(struct pci_dev *dev, struct videobuf_dmabuf *dma) |
| 191 | { |
| 192 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
| 193 | BUG_ON(0 == dma->nr_pages); |
| 194 | |
| 195 | if (dma->pages) { |
| 196 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, |
| 197 | dma->offset); |
| 198 | } |
| 199 | if (dma->vmalloc) { |
| 200 | dma->sglist = videobuf_vmalloc_to_sg |
| 201 | (dma->vmalloc,dma->nr_pages); |
| 202 | } |
| 203 | if (dma->bus_addr) { |
| 204 | dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); |
| 205 | if (NULL != dma->sglist) { |
| 206 | dma->sglen = 1; |
| 207 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; |
| 208 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; |
| 209 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; |
| 210 | } |
| 211 | } |
| 212 | if (NULL == dma->sglist) { |
| 213 | dprintk(1,"scatterlist is NULL\n"); |
| 214 | return -ENOMEM; |
| 215 | } |
| 216 | |
| 217 | if (!dma->bus_addr) { |
| 218 | dma->sglen = pci_map_sg(dev,dma->sglist,dma->nr_pages, |
| 219 | dma->direction); |
| 220 | if (0 == dma->sglen) { |
| 221 | printk(KERN_WARNING |
| 222 | "%s: pci_map_sg failed\n",__FUNCTION__); |
| 223 | kfree(dma->sglist); |
| 224 | dma->sglist = NULL; |
| 225 | dma->sglen = 0; |
| 226 | return -EIO; |
| 227 | } |
| 228 | } |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | int videobuf_dma_pci_sync(struct pci_dev *dev, struct videobuf_dmabuf *dma) |
| 233 | { |
| 234 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
| 235 | BUG_ON(!dma->sglen); |
| 236 | |
| 237 | if (!dma->bus_addr) |
| 238 | pci_dma_sync_sg_for_cpu(dev,dma->sglist,dma->nr_pages,dma->direction); |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | int videobuf_dma_pci_unmap(struct pci_dev *dev, struct videobuf_dmabuf *dma) |
| 243 | { |
| 244 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
| 245 | if (!dma->sglen) |
| 246 | return 0; |
| 247 | |
| 248 | if (!dma->bus_addr) |
| 249 | pci_unmap_sg(dev,dma->sglist,dma->nr_pages,dma->direction); |
| 250 | kfree(dma->sglist); |
| 251 | dma->sglist = NULL; |
| 252 | dma->sglen = 0; |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | int videobuf_dma_free(struct videobuf_dmabuf *dma) |
| 257 | { |
| 258 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
| 259 | BUG_ON(dma->sglen); |
| 260 | |
| 261 | if (dma->pages) { |
| 262 | int i; |
| 263 | for (i=0; i < dma->nr_pages; i++) |
| 264 | page_cache_release(dma->pages[i]); |
| 265 | kfree(dma->pages); |
| 266 | dma->pages = NULL; |
| 267 | } |
Jesper Juhl | f9101210 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 268 | |
| 269 | vfree(dma->vmalloc); |
| 270 | dma->vmalloc = NULL; |
| 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | if (dma->bus_addr) { |
| 273 | dma->bus_addr = 0; |
| 274 | } |
| 275 | dma->direction = PCI_DMA_NONE; |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* --------------------------------------------------------------------- */ |
| 280 | |
| 281 | void* videobuf_alloc(unsigned int size) |
| 282 | { |
| 283 | struct videobuf_buffer *vb; |
| 284 | |
Panagiotis Issaris | 7408187 | 2006-01-11 19:40:56 -0200 | [diff] [blame^] | 285 | vb = kzalloc(size,GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | if (NULL != vb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | videobuf_dma_init(&vb->dma); |
| 288 | init_waitqueue_head(&vb->done); |
| 289 | vb->magic = MAGIC_BUFFER; |
| 290 | } |
| 291 | return vb; |
| 292 | } |
| 293 | |
| 294 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
| 295 | { |
| 296 | int retval = 0; |
| 297 | DECLARE_WAITQUEUE(wait, current); |
| 298 | |
| 299 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); |
| 300 | add_wait_queue(&vb->done, &wait); |
| 301 | while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) { |
| 302 | if (non_blocking) { |
| 303 | retval = -EAGAIN; |
| 304 | break; |
| 305 | } |
| 306 | set_current_state(intr ? TASK_INTERRUPTIBLE |
| 307 | : TASK_UNINTERRUPTIBLE); |
| 308 | if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) |
| 309 | schedule(); |
| 310 | set_current_state(TASK_RUNNING); |
| 311 | if (intr && signal_pending(current)) { |
| 312 | dprintk(1,"buffer waiton: -EINTR\n"); |
| 313 | retval = -EINTR; |
| 314 | break; |
| 315 | } |
| 316 | } |
| 317 | remove_wait_queue(&vb->done, &wait); |
| 318 | return retval; |
| 319 | } |
| 320 | |
| 321 | int |
| 322 | videobuf_iolock(struct pci_dev *pci, struct videobuf_buffer *vb, |
| 323 | struct v4l2_framebuffer *fbuf) |
| 324 | { |
| 325 | int err,pages; |
| 326 | dma_addr_t bus; |
| 327 | |
| 328 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); |
| 329 | switch (vb->memory) { |
| 330 | case V4L2_MEMORY_MMAP: |
| 331 | case V4L2_MEMORY_USERPTR: |
| 332 | if (0 == vb->baddr) { |
| 333 | /* no userspace addr -- kernel bounce buffer */ |
| 334 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; |
| 335 | err = videobuf_dma_init_kernel(&vb->dma,PCI_DMA_FROMDEVICE, |
| 336 | pages); |
| 337 | if (0 != err) |
| 338 | return err; |
| 339 | } else { |
| 340 | /* dma directly to userspace */ |
| 341 | err = videobuf_dma_init_user(&vb->dma,PCI_DMA_FROMDEVICE, |
| 342 | vb->baddr,vb->bsize); |
| 343 | if (0 != err) |
| 344 | return err; |
| 345 | } |
| 346 | break; |
| 347 | case V4L2_MEMORY_OVERLAY: |
| 348 | if (NULL == fbuf) |
| 349 | return -EINVAL; |
| 350 | /* FIXME: need sanity checks for vb->boff */ |
| 351 | bus = (dma_addr_t)fbuf->base + vb->boff; |
| 352 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; |
| 353 | err = videobuf_dma_init_overlay(&vb->dma,PCI_DMA_FROMDEVICE, |
| 354 | bus, pages); |
| 355 | if (0 != err) |
| 356 | return err; |
| 357 | break; |
| 358 | default: |
| 359 | BUG(); |
| 360 | } |
| 361 | err = videobuf_dma_pci_map(pci,&vb->dma); |
| 362 | if (0 != err) |
| 363 | return err; |
| 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | /* --------------------------------------------------------------------- */ |
| 369 | |
| 370 | void videobuf_queue_init(struct videobuf_queue* q, |
| 371 | struct videobuf_queue_ops *ops, |
| 372 | struct pci_dev *pci, |
| 373 | spinlock_t *irqlock, |
| 374 | enum v4l2_buf_type type, |
| 375 | enum v4l2_field field, |
| 376 | unsigned int msize, |
| 377 | void *priv) |
| 378 | { |
| 379 | memset(q,0,sizeof(*q)); |
| 380 | q->irqlock = irqlock; |
| 381 | q->pci = pci; |
| 382 | q->type = type; |
| 383 | q->field = field; |
| 384 | q->msize = msize; |
| 385 | q->ops = ops; |
| 386 | q->priv_data = priv; |
| 387 | |
| 388 | init_MUTEX(&q->lock); |
| 389 | INIT_LIST_HEAD(&q->stream); |
| 390 | } |
| 391 | |
| 392 | int |
| 393 | videobuf_queue_is_busy(struct videobuf_queue *q) |
| 394 | { |
| 395 | int i; |
| 396 | |
| 397 | if (q->streaming) { |
| 398 | dprintk(1,"busy: streaming active\n"); |
| 399 | return 1; |
| 400 | } |
| 401 | if (q->reading) { |
| 402 | dprintk(1,"busy: pending read #1\n"); |
| 403 | return 1; |
| 404 | } |
| 405 | if (q->read_buf) { |
| 406 | dprintk(1,"busy: pending read #2\n"); |
| 407 | return 1; |
| 408 | } |
| 409 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 410 | if (NULL == q->bufs[i]) |
| 411 | continue; |
| 412 | if (q->bufs[i]->map) { |
| 413 | dprintk(1,"busy: buffer #%d mapped\n",i); |
| 414 | return 1; |
| 415 | } |
| 416 | if (q->bufs[i]->state == STATE_QUEUED) { |
| 417 | dprintk(1,"busy: buffer #%d queued\n",i); |
| 418 | return 1; |
| 419 | } |
| 420 | if (q->bufs[i]->state == STATE_ACTIVE) { |
| 421 | dprintk(1,"busy: buffer #%d avtive\n",i); |
| 422 | return 1; |
| 423 | } |
| 424 | } |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | void |
| 429 | videobuf_queue_cancel(struct videobuf_queue *q) |
| 430 | { |
| 431 | unsigned long flags; |
| 432 | int i; |
| 433 | |
| 434 | /* remove queued buffers from list */ |
| 435 | spin_lock_irqsave(q->irqlock,flags); |
| 436 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 437 | if (NULL == q->bufs[i]) |
| 438 | continue; |
| 439 | if (q->bufs[i]->state == STATE_QUEUED) { |
| 440 | list_del(&q->bufs[i]->queue); |
| 441 | q->bufs[i]->state = STATE_ERROR; |
| 442 | } |
| 443 | } |
| 444 | spin_unlock_irqrestore(q->irqlock,flags); |
| 445 | |
| 446 | /* free all buffers + clear queue */ |
| 447 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 448 | if (NULL == q->bufs[i]) |
| 449 | continue; |
| 450 | q->ops->buf_release(q,q->bufs[i]); |
| 451 | } |
| 452 | INIT_LIST_HEAD(&q->stream); |
| 453 | } |
| 454 | |
| 455 | /* --------------------------------------------------------------------- */ |
| 456 | |
| 457 | enum v4l2_field |
| 458 | videobuf_next_field(struct videobuf_queue *q) |
| 459 | { |
| 460 | enum v4l2_field field = q->field; |
| 461 | |
| 462 | BUG_ON(V4L2_FIELD_ANY == field); |
| 463 | |
| 464 | if (V4L2_FIELD_ALTERNATE == field) { |
| 465 | if (V4L2_FIELD_TOP == q->last) { |
| 466 | field = V4L2_FIELD_BOTTOM; |
| 467 | q->last = V4L2_FIELD_BOTTOM; |
| 468 | } else { |
| 469 | field = V4L2_FIELD_TOP; |
| 470 | q->last = V4L2_FIELD_TOP; |
| 471 | } |
| 472 | } |
| 473 | return field; |
| 474 | } |
| 475 | |
| 476 | void |
| 477 | videobuf_status(struct v4l2_buffer *b, struct videobuf_buffer *vb, |
| 478 | enum v4l2_buf_type type) |
| 479 | { |
| 480 | MAGIC_CHECK(vb->magic,MAGIC_BUFFER); |
| 481 | |
| 482 | b->index = vb->i; |
| 483 | b->type = type; |
| 484 | |
| 485 | b->memory = vb->memory; |
| 486 | switch (b->memory) { |
| 487 | case V4L2_MEMORY_MMAP: |
| 488 | b->m.offset = vb->boff; |
| 489 | b->length = vb->bsize; |
| 490 | break; |
| 491 | case V4L2_MEMORY_USERPTR: |
| 492 | b->m.userptr = vb->baddr; |
| 493 | b->length = vb->bsize; |
| 494 | break; |
| 495 | case V4L2_MEMORY_OVERLAY: |
| 496 | b->m.offset = vb->boff; |
| 497 | break; |
| 498 | } |
| 499 | |
| 500 | b->flags = 0; |
| 501 | if (vb->map) |
| 502 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
| 503 | |
| 504 | switch (vb->state) { |
| 505 | case STATE_PREPARED: |
| 506 | case STATE_QUEUED: |
| 507 | case STATE_ACTIVE: |
| 508 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
| 509 | break; |
| 510 | case STATE_DONE: |
| 511 | case STATE_ERROR: |
| 512 | b->flags |= V4L2_BUF_FLAG_DONE; |
| 513 | break; |
| 514 | case STATE_NEEDS_INIT: |
| 515 | case STATE_IDLE: |
| 516 | /* nothing */ |
| 517 | break; |
| 518 | } |
| 519 | |
| 520 | if (vb->input != UNSET) { |
| 521 | b->flags |= V4L2_BUF_FLAG_INPUT; |
| 522 | b->input = vb->input; |
| 523 | } |
| 524 | |
| 525 | b->field = vb->field; |
| 526 | b->timestamp = vb->ts; |
| 527 | b->bytesused = vb->size; |
| 528 | b->sequence = vb->field_count >> 1; |
| 529 | } |
| 530 | |
| 531 | int |
| 532 | videobuf_reqbufs(struct videobuf_queue *q, |
| 533 | struct v4l2_requestbuffers *req) |
| 534 | { |
| 535 | unsigned int size,count; |
| 536 | int retval; |
| 537 | |
| 538 | if (req->type != q->type) |
| 539 | return -EINVAL; |
| 540 | if (req->count < 1) |
| 541 | return -EINVAL; |
| 542 | if (req->memory != V4L2_MEMORY_MMAP && |
| 543 | req->memory != V4L2_MEMORY_USERPTR && |
| 544 | req->memory != V4L2_MEMORY_OVERLAY) |
| 545 | return -EINVAL; |
| 546 | |
| 547 | if (q->streaming) |
| 548 | return -EBUSY; |
| 549 | if (!list_empty(&q->stream)) |
| 550 | return -EBUSY; |
| 551 | |
| 552 | down(&q->lock); |
| 553 | count = req->count; |
| 554 | if (count > VIDEO_MAX_FRAME) |
| 555 | count = VIDEO_MAX_FRAME; |
| 556 | size = 0; |
| 557 | q->ops->buf_setup(q,&count,&size); |
| 558 | size = PAGE_ALIGN(size); |
| 559 | dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n", |
| 560 | count, size, (count*size)>>PAGE_SHIFT); |
| 561 | |
| 562 | retval = videobuf_mmap_setup(q,count,size,req->memory); |
| 563 | if (retval < 0) |
| 564 | goto done; |
| 565 | |
| 566 | req->count = count; |
| 567 | |
| 568 | done: |
| 569 | up(&q->lock); |
| 570 | return retval; |
| 571 | } |
| 572 | |
| 573 | int |
| 574 | videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
| 575 | { |
| 576 | if (unlikely(b->type != q->type)) |
| 577 | return -EINVAL; |
| 578 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) |
| 579 | return -EINVAL; |
| 580 | if (unlikely(NULL == q->bufs[b->index])) |
| 581 | return -EINVAL; |
| 582 | videobuf_status(b,q->bufs[b->index],q->type); |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | int |
| 587 | videobuf_qbuf(struct videobuf_queue *q, |
| 588 | struct v4l2_buffer *b) |
| 589 | { |
| 590 | struct videobuf_buffer *buf; |
| 591 | enum v4l2_field field; |
| 592 | unsigned long flags; |
| 593 | int retval; |
| 594 | |
| 595 | down(&q->lock); |
| 596 | retval = -EBUSY; |
| 597 | if (q->reading) |
| 598 | goto done; |
| 599 | retval = -EINVAL; |
| 600 | if (b->type != q->type) |
| 601 | goto done; |
| 602 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) |
| 603 | goto done; |
| 604 | buf = q->bufs[b->index]; |
| 605 | if (NULL == buf) |
| 606 | goto done; |
| 607 | MAGIC_CHECK(buf->magic,MAGIC_BUFFER); |
| 608 | if (buf->memory != b->memory) |
| 609 | goto done; |
| 610 | if (buf->state == STATE_QUEUED || |
| 611 | buf->state == STATE_ACTIVE) |
| 612 | goto done; |
| 613 | |
| 614 | if (b->flags & V4L2_BUF_FLAG_INPUT) { |
| 615 | if (b->input >= q->inputs) |
| 616 | goto done; |
| 617 | buf->input = b->input; |
| 618 | } else { |
| 619 | buf->input = UNSET; |
| 620 | } |
| 621 | |
| 622 | switch (b->memory) { |
| 623 | case V4L2_MEMORY_MMAP: |
| 624 | if (0 == buf->baddr) |
| 625 | goto done; |
| 626 | break; |
| 627 | case V4L2_MEMORY_USERPTR: |
| 628 | if (b->length < buf->bsize) |
| 629 | goto done; |
| 630 | if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr) |
| 631 | q->ops->buf_release(q,buf); |
| 632 | buf->baddr = b->m.userptr; |
| 633 | break; |
| 634 | case V4L2_MEMORY_OVERLAY: |
| 635 | buf->boff = b->m.offset; |
| 636 | break; |
| 637 | default: |
| 638 | goto done; |
| 639 | } |
| 640 | |
| 641 | field = videobuf_next_field(q); |
| 642 | retval = q->ops->buf_prepare(q,buf,field); |
| 643 | if (0 != retval) |
| 644 | goto done; |
| 645 | |
| 646 | list_add_tail(&buf->stream,&q->stream); |
| 647 | if (q->streaming) { |
| 648 | spin_lock_irqsave(q->irqlock,flags); |
| 649 | q->ops->buf_queue(q,buf); |
| 650 | spin_unlock_irqrestore(q->irqlock,flags); |
| 651 | } |
| 652 | retval = 0; |
| 653 | |
| 654 | done: |
| 655 | up(&q->lock); |
| 656 | return retval; |
| 657 | } |
| 658 | |
| 659 | int |
| 660 | videobuf_dqbuf(struct videobuf_queue *q, |
| 661 | struct v4l2_buffer *b, int nonblocking) |
| 662 | { |
| 663 | struct videobuf_buffer *buf; |
| 664 | int retval; |
| 665 | |
| 666 | down(&q->lock); |
| 667 | retval = -EBUSY; |
| 668 | if (q->reading) |
| 669 | goto done; |
| 670 | retval = -EINVAL; |
| 671 | if (b->type != q->type) |
| 672 | goto done; |
| 673 | if (list_empty(&q->stream)) |
| 674 | goto done; |
| 675 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
| 676 | retval = videobuf_waiton(buf, nonblocking, 1); |
| 677 | if (retval < 0) |
| 678 | goto done; |
| 679 | switch (buf->state) { |
| 680 | case STATE_ERROR: |
| 681 | retval = -EIO; |
| 682 | /* fall through */ |
| 683 | case STATE_DONE: |
| 684 | videobuf_dma_pci_sync(q->pci,&buf->dma); |
| 685 | buf->state = STATE_IDLE; |
| 686 | break; |
| 687 | default: |
| 688 | retval = -EINVAL; |
| 689 | goto done; |
| 690 | } |
| 691 | list_del(&buf->stream); |
| 692 | memset(b,0,sizeof(*b)); |
| 693 | videobuf_status(b,buf,q->type); |
| 694 | |
| 695 | done: |
| 696 | up(&q->lock); |
| 697 | return retval; |
| 698 | } |
| 699 | |
| 700 | int videobuf_streamon(struct videobuf_queue *q) |
| 701 | { |
| 702 | struct videobuf_buffer *buf; |
| 703 | struct list_head *list; |
| 704 | unsigned long flags; |
| 705 | int retval; |
| 706 | |
| 707 | down(&q->lock); |
| 708 | retval = -EBUSY; |
| 709 | if (q->reading) |
| 710 | goto done; |
| 711 | retval = 0; |
| 712 | if (q->streaming) |
| 713 | goto done; |
| 714 | q->streaming = 1; |
| 715 | spin_lock_irqsave(q->irqlock,flags); |
| 716 | list_for_each(list,&q->stream) { |
| 717 | buf = list_entry(list, struct videobuf_buffer, stream); |
| 718 | if (buf->state == STATE_PREPARED) |
| 719 | q->ops->buf_queue(q,buf); |
| 720 | } |
| 721 | spin_unlock_irqrestore(q->irqlock,flags); |
| 722 | |
| 723 | done: |
| 724 | up(&q->lock); |
| 725 | return retval; |
| 726 | } |
| 727 | |
| 728 | int videobuf_streamoff(struct videobuf_queue *q) |
| 729 | { |
| 730 | int retval = -EINVAL; |
| 731 | |
| 732 | down(&q->lock); |
| 733 | if (!q->streaming) |
| 734 | goto done; |
| 735 | videobuf_queue_cancel(q); |
| 736 | q->streaming = 0; |
| 737 | retval = 0; |
| 738 | |
| 739 | done: |
| 740 | up(&q->lock); |
| 741 | return retval; |
| 742 | } |
| 743 | |
| 744 | static ssize_t |
| 745 | videobuf_read_zerocopy(struct videobuf_queue *q, char __user *data, |
| 746 | size_t count, loff_t *ppos) |
| 747 | { |
| 748 | enum v4l2_field field; |
| 749 | unsigned long flags; |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 750 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 752 | /* setup stuff */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | q->read_buf = videobuf_alloc(q->msize); |
| 754 | if (NULL == q->read_buf) |
Nickolay V. Shmyrev | 50ab5ed | 2005-12-01 00:51:32 -0800 | [diff] [blame] | 755 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
| 757 | q->read_buf->memory = V4L2_MEMORY_USERPTR; |
| 758 | q->read_buf->baddr = (unsigned long)data; |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 759 | q->read_buf->bsize = count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | field = videobuf_next_field(q); |
| 761 | retval = q->ops->buf_prepare(q,q->read_buf,field); |
| 762 | if (0 != retval) |
| 763 | goto done; |
| 764 | |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 765 | /* start capture & wait */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | spin_lock_irqsave(q->irqlock,flags); |
| 767 | q->ops->buf_queue(q,q->read_buf); |
| 768 | spin_unlock_irqrestore(q->irqlock,flags); |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 769 | retval = videobuf_waiton(q->read_buf,0,0); |
| 770 | if (0 == retval) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); |
| 772 | if (STATE_ERROR == q->read_buf->state) |
| 773 | retval = -EIO; |
| 774 | else |
| 775 | retval = q->read_buf->size; |
| 776 | } |
| 777 | |
| 778 | done: |
| 779 | /* cleanup */ |
| 780 | q->ops->buf_release(q,q->read_buf); |
| 781 | kfree(q->read_buf); |
| 782 | q->read_buf = NULL; |
| 783 | return retval; |
| 784 | } |
| 785 | |
| 786 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
| 787 | char __user *data, size_t count, loff_t *ppos, |
| 788 | int nonblocking) |
| 789 | { |
| 790 | enum v4l2_field field; |
| 791 | unsigned long flags; |
| 792 | unsigned size, nbufs, bytes; |
| 793 | int retval; |
| 794 | |
| 795 | down(&q->lock); |
| 796 | |
| 797 | nbufs = 1; size = 0; |
| 798 | q->ops->buf_setup(q,&nbufs,&size); |
| 799 | if (NULL == q->read_buf && |
| 800 | count >= size && |
| 801 | !nonblocking) { |
| 802 | retval = videobuf_read_zerocopy(q,data,count,ppos); |
| 803 | if (retval >= 0 || retval == -EIO) |
| 804 | /* ok, all done */ |
| 805 | goto done; |
| 806 | /* fallback to kernel bounce buffer on failures */ |
| 807 | } |
| 808 | |
| 809 | if (NULL == q->read_buf) { |
| 810 | /* need to capture a new frame */ |
| 811 | retval = -ENOMEM; |
| 812 | q->read_buf = videobuf_alloc(q->msize); |
| 813 | if (NULL == q->read_buf) |
| 814 | goto done; |
| 815 | q->read_buf->memory = V4L2_MEMORY_USERPTR; |
Michael H. Schimek | 13c7280 | 2005-12-01 00:51:37 -0800 | [diff] [blame] | 816 | q->read_buf->bsize = count; /* preferred size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | field = videobuf_next_field(q); |
| 818 | retval = q->ops->buf_prepare(q,q->read_buf,field); |
Nickolay V. Shmyrev | 50ab5ed | 2005-12-01 00:51:32 -0800 | [diff] [blame] | 819 | if (0 != retval) { |
| 820 | kfree (q->read_buf); |
| 821 | q->read_buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | goto done; |
Nickolay V. Shmyrev | 50ab5ed | 2005-12-01 00:51:32 -0800 | [diff] [blame] | 823 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | spin_lock_irqsave(q->irqlock,flags); |
| 825 | q->ops->buf_queue(q,q->read_buf); |
| 826 | spin_unlock_irqrestore(q->irqlock,flags); |
| 827 | q->read_off = 0; |
| 828 | } |
| 829 | |
| 830 | /* wait until capture is done */ |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 831 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | if (0 != retval) |
| 833 | goto done; |
| 834 | videobuf_dma_pci_sync(q->pci,&q->read_buf->dma); |
| 835 | |
| 836 | if (STATE_ERROR == q->read_buf->state) { |
| 837 | /* catch I/O errors */ |
| 838 | q->ops->buf_release(q,q->read_buf); |
| 839 | kfree(q->read_buf); |
| 840 | q->read_buf = NULL; |
| 841 | retval = -EIO; |
| 842 | goto done; |
| 843 | } |
| 844 | |
| 845 | /* copy to userspace */ |
| 846 | bytes = count; |
| 847 | if (bytes > q->read_buf->size - q->read_off) |
| 848 | bytes = q->read_buf->size - q->read_off; |
| 849 | retval = -EFAULT; |
| 850 | if (copy_to_user(data, q->read_buf->dma.vmalloc+q->read_off, bytes)) |
| 851 | goto done; |
| 852 | |
| 853 | retval = bytes; |
| 854 | q->read_off += bytes; |
| 855 | if (q->read_off == q->read_buf->size) { |
| 856 | /* all data copied, cleanup */ |
| 857 | q->ops->buf_release(q,q->read_buf); |
| 858 | kfree(q->read_buf); |
| 859 | q->read_buf = NULL; |
| 860 | } |
| 861 | |
| 862 | done: |
| 863 | up(&q->lock); |
| 864 | return retval; |
| 865 | } |
| 866 | |
| 867 | int videobuf_read_start(struct videobuf_queue *q) |
| 868 | { |
| 869 | enum v4l2_field field; |
| 870 | unsigned long flags; |
| 871 | int count = 0, size = 0; |
| 872 | int err, i; |
| 873 | |
| 874 | q->ops->buf_setup(q,&count,&size); |
| 875 | if (count < 2) |
| 876 | count = 2; |
| 877 | if (count > VIDEO_MAX_FRAME) |
| 878 | count = VIDEO_MAX_FRAME; |
| 879 | size = PAGE_ALIGN(size); |
| 880 | |
| 881 | err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
| 882 | if (err) |
| 883 | return err; |
| 884 | for (i = 0; i < count; i++) { |
| 885 | field = videobuf_next_field(q); |
| 886 | err = q->ops->buf_prepare(q,q->bufs[i],field); |
| 887 | if (err) |
| 888 | return err; |
| 889 | list_add_tail(&q->bufs[i]->stream, &q->stream); |
| 890 | } |
| 891 | spin_lock_irqsave(q->irqlock,flags); |
| 892 | for (i = 0; i < count; i++) |
| 893 | q->ops->buf_queue(q,q->bufs[i]); |
| 894 | spin_unlock_irqrestore(q->irqlock,flags); |
| 895 | q->reading = 1; |
| 896 | return 0; |
| 897 | } |
| 898 | |
| 899 | void videobuf_read_stop(struct videobuf_queue *q) |
| 900 | { |
| 901 | int i; |
| 902 | |
| 903 | videobuf_queue_cancel(q); |
| 904 | videobuf_mmap_free(q); |
| 905 | INIT_LIST_HEAD(&q->stream); |
| 906 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 907 | if (NULL == q->bufs[i]) |
| 908 | continue; |
| 909 | kfree(q->bufs[i]); |
| 910 | q->bufs[i] = NULL; |
| 911 | } |
| 912 | q->read_buf = NULL; |
| 913 | q->reading = 0; |
| 914 | } |
| 915 | |
| 916 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
| 917 | char __user *data, size_t count, loff_t *ppos, |
| 918 | int vbihack, int nonblocking) |
| 919 | { |
| 920 | unsigned int *fc, bytes; |
| 921 | int err, retval; |
| 922 | unsigned long flags; |
| 923 | |
| 924 | dprintk(2,"%s\n",__FUNCTION__); |
| 925 | down(&q->lock); |
| 926 | retval = -EBUSY; |
| 927 | if (q->streaming) |
| 928 | goto done; |
| 929 | if (!q->reading) { |
| 930 | retval = videobuf_read_start(q); |
| 931 | if (retval < 0) |
| 932 | goto done; |
| 933 | } |
| 934 | |
| 935 | retval = 0; |
| 936 | while (count > 0) { |
| 937 | /* get / wait for data */ |
| 938 | if (NULL == q->read_buf) { |
| 939 | q->read_buf = list_entry(q->stream.next, |
| 940 | struct videobuf_buffer, |
| 941 | stream); |
| 942 | list_del(&q->read_buf->stream); |
| 943 | q->read_off = 0; |
| 944 | } |
| 945 | err = videobuf_waiton(q->read_buf, nonblocking, 1); |
| 946 | if (err < 0) { |
| 947 | if (0 == retval) |
| 948 | retval = err; |
| 949 | break; |
| 950 | } |
| 951 | |
| 952 | if (q->read_buf->state == STATE_DONE) { |
| 953 | if (vbihack) { |
| 954 | /* dirty, undocumented hack -- pass the frame counter |
| 955 | * within the last four bytes of each vbi data block. |
| 956 | * We need that one to maintain backward compatibility |
| 957 | * to all vbi decoding software out there ... */ |
| 958 | fc = (unsigned int*)q->read_buf->dma.vmalloc; |
| 959 | fc += (q->read_buf->size>>2) -1; |
| 960 | *fc = q->read_buf->field_count >> 1; |
| 961 | dprintk(1,"vbihack: %d\n",*fc); |
| 962 | } |
| 963 | |
| 964 | /* copy stuff */ |
| 965 | bytes = count; |
| 966 | if (bytes > q->read_buf->size - q->read_off) |
| 967 | bytes = q->read_buf->size - q->read_off; |
| 968 | if (copy_to_user(data + retval, |
| 969 | q->read_buf->dma.vmalloc + q->read_off, |
| 970 | bytes)) { |
| 971 | if (0 == retval) |
| 972 | retval = -EFAULT; |
| 973 | break; |
| 974 | } |
| 975 | count -= bytes; |
| 976 | retval += bytes; |
| 977 | q->read_off += bytes; |
| 978 | } else { |
| 979 | /* some error */ |
| 980 | q->read_off = q->read_buf->size; |
| 981 | if (0 == retval) |
| 982 | retval = -EIO; |
| 983 | } |
| 984 | |
| 985 | /* requeue buffer when done with copying */ |
| 986 | if (q->read_off == q->read_buf->size) { |
| 987 | list_add_tail(&q->read_buf->stream, |
| 988 | &q->stream); |
| 989 | spin_lock_irqsave(q->irqlock,flags); |
| 990 | q->ops->buf_queue(q,q->read_buf); |
| 991 | spin_unlock_irqrestore(q->irqlock,flags); |
| 992 | q->read_buf = NULL; |
| 993 | } |
| 994 | if (retval < 0) |
| 995 | break; |
| 996 | } |
| 997 | |
| 998 | done: |
| 999 | up(&q->lock); |
| 1000 | return retval; |
| 1001 | } |
| 1002 | |
| 1003 | unsigned int videobuf_poll_stream(struct file *file, |
| 1004 | struct videobuf_queue *q, |
| 1005 | poll_table *wait) |
| 1006 | { |
| 1007 | struct videobuf_buffer *buf = NULL; |
| 1008 | unsigned int rc = 0; |
| 1009 | |
| 1010 | down(&q->lock); |
| 1011 | if (q->streaming) { |
| 1012 | if (!list_empty(&q->stream)) |
| 1013 | buf = list_entry(q->stream.next, |
| 1014 | struct videobuf_buffer, stream); |
| 1015 | } else { |
| 1016 | if (!q->reading) |
| 1017 | videobuf_read_start(q); |
| 1018 | if (!q->reading) { |
| 1019 | rc = POLLERR; |
| 1020 | } else if (NULL == q->read_buf) { |
| 1021 | q->read_buf = list_entry(q->stream.next, |
| 1022 | struct videobuf_buffer, |
| 1023 | stream); |
| 1024 | list_del(&q->read_buf->stream); |
| 1025 | q->read_off = 0; |
| 1026 | } |
| 1027 | buf = q->read_buf; |
| 1028 | } |
| 1029 | if (!buf) |
| 1030 | rc = POLLERR; |
| 1031 | |
| 1032 | if (0 == rc) { |
| 1033 | poll_wait(file, &buf->done, wait); |
| 1034 | if (buf->state == STATE_DONE || |
| 1035 | buf->state == STATE_ERROR) |
| 1036 | rc = POLLIN|POLLRDNORM; |
| 1037 | } |
| 1038 | up(&q->lock); |
| 1039 | return rc; |
| 1040 | } |
| 1041 | |
| 1042 | /* --------------------------------------------------------------------- */ |
| 1043 | |
| 1044 | static void |
| 1045 | videobuf_vm_open(struct vm_area_struct *vma) |
| 1046 | { |
| 1047 | struct videobuf_mapping *map = vma->vm_private_data; |
| 1048 | |
| 1049 | dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map, |
| 1050 | map->count,vma->vm_start,vma->vm_end); |
| 1051 | map->count++; |
| 1052 | } |
| 1053 | |
| 1054 | static void |
| 1055 | videobuf_vm_close(struct vm_area_struct *vma) |
| 1056 | { |
| 1057 | struct videobuf_mapping *map = vma->vm_private_data; |
| 1058 | struct videobuf_queue *q = map->q; |
| 1059 | int i; |
| 1060 | |
| 1061 | dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map, |
| 1062 | map->count,vma->vm_start,vma->vm_end); |
| 1063 | |
| 1064 | map->count--; |
| 1065 | if (0 == map->count) { |
| 1066 | dprintk(1,"munmap %p q=%p\n",map,q); |
| 1067 | down(&q->lock); |
| 1068 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 1069 | if (NULL == q->bufs[i]) |
| 1070 | continue; |
| 1071 | if (q->bufs[i]) |
| 1072 | ; |
| 1073 | if (q->bufs[i]->map != map) |
| 1074 | continue; |
| 1075 | q->bufs[i]->map = NULL; |
| 1076 | q->bufs[i]->baddr = 0; |
| 1077 | q->ops->buf_release(q,q->bufs[i]); |
| 1078 | } |
| 1079 | up(&q->lock); |
| 1080 | kfree(map); |
| 1081 | } |
| 1082 | return; |
| 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * Get a anonymous page for the mapping. Make sure we can DMA to that |
| 1087 | * memory location with 32bit PCI devices (i.e. don't use highmem for |
| 1088 | * now ...). Bounce buffers don't work very well for the data rates |
| 1089 | * video capture has. |
| 1090 | */ |
| 1091 | static struct page* |
| 1092 | videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr, |
| 1093 | int *type) |
| 1094 | { |
| 1095 | struct page *page; |
| 1096 | |
| 1097 | dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n", |
| 1098 | vaddr,vma->vm_start,vma->vm_end); |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 1099 | if (vaddr > vma->vm_end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | return NOPAGE_SIGBUS; |
| 1101 | page = alloc_page(GFP_USER); |
| 1102 | if (!page) |
| 1103 | return NOPAGE_OOM; |
| 1104 | clear_user_page(page_address(page), vaddr, page); |
| 1105 | if (type) |
| 1106 | *type = VM_FAULT_MINOR; |
| 1107 | return page; |
| 1108 | } |
| 1109 | |
| 1110 | static struct vm_operations_struct videobuf_vm_ops = |
| 1111 | { |
| 1112 | .open = videobuf_vm_open, |
| 1113 | .close = videobuf_vm_close, |
| 1114 | .nopage = videobuf_vm_nopage, |
| 1115 | }; |
| 1116 | |
| 1117 | int videobuf_mmap_setup(struct videobuf_queue *q, |
| 1118 | unsigned int bcount, unsigned int bsize, |
| 1119 | enum v4l2_memory memory) |
| 1120 | { |
| 1121 | unsigned int i; |
| 1122 | int err; |
| 1123 | |
| 1124 | err = videobuf_mmap_free(q); |
| 1125 | if (0 != err) |
| 1126 | return err; |
| 1127 | |
| 1128 | for (i = 0; i < bcount; i++) { |
| 1129 | q->bufs[i] = videobuf_alloc(q->msize); |
| 1130 | q->bufs[i]->i = i; |
| 1131 | q->bufs[i]->input = UNSET; |
| 1132 | q->bufs[i]->memory = memory; |
| 1133 | q->bufs[i]->bsize = bsize; |
| 1134 | switch (memory) { |
| 1135 | case V4L2_MEMORY_MMAP: |
| 1136 | q->bufs[i]->boff = bsize * i; |
| 1137 | break; |
| 1138 | case V4L2_MEMORY_USERPTR: |
| 1139 | case V4L2_MEMORY_OVERLAY: |
| 1140 | /* nothing */ |
| 1141 | break; |
| 1142 | } |
| 1143 | } |
| 1144 | dprintk(1,"mmap setup: %d buffers, %d bytes each\n", |
| 1145 | bcount,bsize); |
| 1146 | return 0; |
| 1147 | } |
| 1148 | |
| 1149 | int videobuf_mmap_free(struct videobuf_queue *q) |
| 1150 | { |
| 1151 | int i; |
| 1152 | |
| 1153 | for (i = 0; i < VIDEO_MAX_FRAME; i++) |
| 1154 | if (q->bufs[i] && q->bufs[i]->map) |
| 1155 | return -EBUSY; |
| 1156 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 1157 | if (NULL == q->bufs[i]) |
| 1158 | continue; |
| 1159 | q->ops->buf_release(q,q->bufs[i]); |
| 1160 | kfree(q->bufs[i]); |
| 1161 | q->bufs[i] = NULL; |
| 1162 | } |
| 1163 | return 0; |
| 1164 | } |
| 1165 | |
| 1166 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
| 1167 | struct vm_area_struct *vma) |
| 1168 | { |
| 1169 | struct videobuf_mapping *map; |
| 1170 | unsigned int first,last,size,i; |
| 1171 | int retval; |
| 1172 | |
| 1173 | down(&q->lock); |
| 1174 | retval = -EINVAL; |
| 1175 | if (!(vma->vm_flags & VM_WRITE)) { |
| 1176 | dprintk(1,"mmap app bug: PROT_WRITE please\n"); |
| 1177 | goto done; |
| 1178 | } |
| 1179 | if (!(vma->vm_flags & VM_SHARED)) { |
| 1180 | dprintk(1,"mmap app bug: MAP_SHARED please\n"); |
| 1181 | goto done; |
| 1182 | } |
| 1183 | |
| 1184 | /* look for first buffer to map */ |
| 1185 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { |
| 1186 | if (NULL == q->bufs[first]) |
| 1187 | continue; |
| 1188 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) |
| 1189 | continue; |
| 1190 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) |
| 1191 | break; |
| 1192 | } |
| 1193 | if (VIDEO_MAX_FRAME == first) { |
| 1194 | dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n", |
| 1195 | (vma->vm_pgoff << PAGE_SHIFT)); |
| 1196 | goto done; |
| 1197 | } |
| 1198 | |
| 1199 | /* look for last buffer to map */ |
| 1200 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { |
| 1201 | if (NULL == q->bufs[last]) |
| 1202 | continue; |
| 1203 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) |
| 1204 | continue; |
| 1205 | if (q->bufs[last]->map) { |
| 1206 | retval = -EBUSY; |
| 1207 | goto done; |
| 1208 | } |
| 1209 | size += q->bufs[last]->bsize; |
| 1210 | if (size == (vma->vm_end - vma->vm_start)) |
| 1211 | break; |
| 1212 | } |
| 1213 | if (VIDEO_MAX_FRAME == last) { |
| 1214 | dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n", |
| 1215 | (vma->vm_end - vma->vm_start)); |
| 1216 | goto done; |
| 1217 | } |
| 1218 | |
| 1219 | /* create mapping + update buffer list */ |
| 1220 | retval = -ENOMEM; |
| 1221 | map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL); |
| 1222 | if (NULL == map) |
| 1223 | goto done; |
| 1224 | for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) { |
| 1225 | q->bufs[i]->map = map; |
| 1226 | q->bufs[i]->baddr = vma->vm_start + size; |
| 1227 | } |
| 1228 | map->count = 1; |
| 1229 | map->start = vma->vm_start; |
| 1230 | map->end = vma->vm_end; |
| 1231 | map->q = q; |
| 1232 | vma->vm_ops = &videobuf_vm_ops; |
| 1233 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; |
| 1234 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ |
| 1235 | vma->vm_private_data = map; |
| 1236 | dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
| 1237 | map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last); |
| 1238 | retval = 0; |
| 1239 | |
| 1240 | done: |
| 1241 | up(&q->lock); |
| 1242 | return retval; |
| 1243 | } |
| 1244 | |
| 1245 | /* --------------------------------------------------------------------- */ |
| 1246 | |
| 1247 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); |
| 1248 | |
| 1249 | EXPORT_SYMBOL_GPL(videobuf_dma_init); |
| 1250 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); |
| 1251 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); |
| 1252 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); |
| 1253 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_map); |
| 1254 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_sync); |
| 1255 | EXPORT_SYMBOL_GPL(videobuf_dma_pci_unmap); |
| 1256 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
| 1257 | |
| 1258 | EXPORT_SYMBOL_GPL(videobuf_alloc); |
| 1259 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
| 1260 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
| 1261 | |
| 1262 | EXPORT_SYMBOL_GPL(videobuf_queue_init); |
| 1263 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
| 1264 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
| 1265 | |
| 1266 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
| 1267 | EXPORT_SYMBOL_GPL(videobuf_status); |
| 1268 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
| 1269 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
| 1270 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
| 1271 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
| 1272 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
| 1273 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
| 1274 | |
| 1275 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
| 1276 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
| 1277 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
| 1278 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
| 1279 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
| 1280 | |
| 1281 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
| 1282 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
| 1283 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |
| 1284 | |
| 1285 | /* |
| 1286 | * Local variables: |
| 1287 | * c-basic-offset: 8 |
| 1288 | * End: |
| 1289 | */ |