drivers/media/video/videobuf-dma-sg.c

   1 /*
   2  * helper functions for PCI DMA video4linux capture buffers
   3  *
   4  * The functions expect the hardware being able to scatter gatter
   5  * (i.e. the buffers are not linear in physical memory, but fragmented
   6  * into PAGE_SIZE chunks).  They also assume the driver does not need
   7  * to touch the video data.
   8  *
   9  * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
  10  *
  11  * Highly based on video-buf written originally by:
  12  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
  13  * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
  14  * (c) 2006 Ted Walther and John Sokol
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/slab.h>
  25 #include <linux/interrupt.h>
  26
  27 #include <linux/pci.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/pagemap.h>
  30 #include <asm/page.h>
  31 #include <asm/pgtable.h>
  32
  33 #include <media/videobuf-dma-sg.h>
  34
  35 #define MAGIC_DMABUF 0x19721112
  36 #define MAGIC_SG_MEM 0x17890714
  37
  38 #define MAGIC_CHECK(is,should)  if (unlikely((is) != (should))) \
  39         { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
  40
  41 static int debug = 0;
  42 module_param(debug, int, 0644);
  43
  44 MODULE_DESCRIPTION("helper module to manage video4linux pci dma sg buffers");
  45 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
  46 MODULE_LICENSE("GPL");
  47
  48 #define dprintk(level, fmt, arg...)     if (debug >= level) \
  49         printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
  50
  51 /* --------------------------------------------------------------------- */
  52
  53 struct scatterlist*
  54 videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages)
  55 {
  56         struct scatterlist *sglist;
  57         struct page *pg;
  58         int i;
  59
  60         sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
  61         if (NULL == sglist)
  62                 return NULL;
  63         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
  64                 pg = vmalloc_to_page(virt);
  65                 if (NULL == pg)
  66                         goto err;
  67                 BUG_ON(PageHighMem(pg));
  68                 sglist[i].page   = pg;
  69                 sglist[i].length = PAGE_SIZE;
  70         }
  71         return sglist;
  72
  73  err:
  74         kfree(sglist);
  75         return NULL;
  76 }
  77
  78 struct scatterlist*
  79 videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset)
  80 {
  81         struct scatterlist *sglist;
  82         int i = 0;
  83
  84         if (NULL == pages[0])
  85                 return NULL;
  86         sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL);
  87         if (NULL == sglist)
  88                 return NULL;
  89
  90         if (NULL == pages[0])
  91                 goto nopage;
  92         if (PageHighMem(pages[0]))
  93                 /* DMA to highmem pages might not work */
  94                 goto highmem;
  95         sglist[0].page   = pages[0];
  96         sglist[0].offset = offset;
  97         sglist[0].length = PAGE_SIZE - offset;
  98         for (i = 1; i < nr_pages; i++) {
  99                 if (NULL == pages[i])
 100                         goto nopage;
 101                 if (PageHighMem(pages[i]))
 102                         goto highmem;
 103                 sglist[i].page   = pages[i];
 104                 sglist[i].length = PAGE_SIZE;
 105         }
 106         return sglist;
 107
 108  nopage:
 109         dprintk(2,"sgl: oops - no page\n");
 110         kfree(sglist);
 111         return NULL;
 112
 113  highmem:
 114         dprintk(2,"sgl: oops - highmem page\n");
 115         kfree(sglist);
 116         return NULL;
 117 }
 118
 119 /* --------------------------------------------------------------------- */
 120
 121 struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf)
 122 {
 123         struct videbuf_pci_sg_memory *mem=buf->priv;
 124         BUG_ON (!mem);
 125
 126         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 127
 128         return &mem->dma;
 129 }
 130
 131 void videobuf_dma_init(struct videobuf_dmabuf *dma)
 132 {
 133         memset(dma,0,sizeof(*dma));
 134         dma->magic = MAGIC_DMABUF;
 135 }
 136
 137 static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
 138                         int direction, unsigned long data, unsigned long size)
 139 {
 140         unsigned long first,last;
 141         int err, rw = 0;
 142
 143         dma->direction = direction;
 144         switch (dma->direction) {
 145         case PCI_DMA_FROMDEVICE: rw = READ;  break;
 146         case PCI_DMA_TODEVICE:   rw = WRITE; break;
 147         default:                 BUG();
 148         }
 149
 150         first = (data          & PAGE_MASK) >> PAGE_SHIFT;
 151         last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
 152         dma->offset   = data & ~PAGE_MASK;
 153         dma->nr_pages = last-first+1;
 154         dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*),
 155                              GFP_KERNEL);
 156         if (NULL == dma->pages)
 157                 return -ENOMEM;
 158         dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n",
 159                 data,size,dma->nr_pages);
 160
 161         dma->varea = (void *) data;
 162
 163
 164         err = get_user_pages(current,current->mm,
 165                              data & PAGE_MASK, dma->nr_pages,
 166                              rw == READ, 1, /* force */
 167                              dma->pages, NULL);
 168
 169         if (err != dma->nr_pages) {
 170                 dma->nr_pages = (err >= 0) ? err : 0;
 171                 dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages);
 172                 return err < 0 ? err : -EINVAL;
 173         }
 174         return 0;
 175 }
 176
 177 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
 178                            unsigned long data, unsigned long size)
 179 {
 180         int ret;
 181         down_read(&current->mm->mmap_sem);
 182         ret = videobuf_dma_init_user_locked(dma, direction, data, size);
 183         up_read(&current->mm->mmap_sem);
 184
 185         return ret;
 186 }
 187
 188 int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
 189                              int nr_pages)
 190 {
 191         dprintk(1,"init kernel [%d pages]\n",nr_pages);
 192         dma->direction = direction;
 193         dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT);
 194         if (NULL == dma->vmalloc) {
 195                 dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages);
 196                 return -ENOMEM;
 197         }
 198         dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
 199                                 (unsigned long)dma->vmalloc,
 200                                 nr_pages << PAGE_SHIFT);
 201         memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT);
 202         dma->nr_pages = nr_pages;
 203         return 0;
 204 }
 205
 206 int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
 207                               dma_addr_t addr, int nr_pages)
 208 {
 209         dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n",
 210                 nr_pages,(unsigned long)addr);
 211         dma->direction = direction;
 212         if (0 == addr)
 213                 return -EINVAL;
 214
 215         dma->bus_addr = addr;
 216         dma->nr_pages = nr_pages;
 217         return 0;
 218 }
 219
 220 int videobuf_dma_map(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 221 {
 222         void                   *dev=q->dev;
 223         struct videobuf_dma_sg_ops *ops=q->priv_ops;
 224
 225         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 226         BUG_ON(0 == dma->nr_pages);
 227
 228         if (dma->pages) {
 229                 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
 230                                                    dma->offset);
 231         }
 232         if (dma->vmalloc) {
 233                 dma->sglist = videobuf_vmalloc_to_sg
 234                                                 (dma->vmalloc,dma->nr_pages);
 235         }
 236         if (dma->bus_addr) {
 237                 dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL);
 238                 if (NULL != dma->sglist) {
 239                         dma->sglen  = 1;
 240                         sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK;
 241                         dma->sglist[0].offset           = dma->bus_addr & ~PAGE_MASK;
 242                         sg_dma_len(&dma->sglist[0])     = dma->nr_pages * PAGE_SIZE;
 243                 }
 244         }
 245         if (NULL == dma->sglist) {
 246                 dprintk(1,"scatterlist is NULL\n");
 247                 return -ENOMEM;
 248         }
 249         if (!dma->bus_addr) {
 250                 if (ops && ops->vb_map_sg) {
 251                         dma->sglen = ops->vb_map_sg(dev,dma->sglist,
 252                                         dma->nr_pages, dma->direction);
 253                 }
 254                 if (0 == dma->sglen) {
 255                         printk(KERN_WARNING
 256                                "%s: videobuf_map_sg failed\n",__FUNCTION__);
 257                         kfree(dma->sglist);
 258                         dma->sglist = NULL;
 259                         dma->sglen = 0;
 260                         return -EIO;
 261                 }
 262         }
 263         return 0;
 264 }
 265
 266 int videobuf_dma_sync(struct videobuf_queue *q,struct videobuf_dmabuf *dma)
 267 {
 268         void                   *dev=q->dev;
 269         struct videobuf_dma_sg_ops *ops=q->priv_ops;
 270
 271         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 272         BUG_ON(!dma->sglen);
 273
 274         if (!dma->bus_addr && ops && ops->vb_dma_sync_sg)
 275                 ops->vb_dma_sync_sg(dev,dma->sglist,dma->nr_pages,
 276                                                         dma->direction);
 277
 278         return 0;
 279 }
 280
 281 int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma)
 282 {
 283         void                   *dev=q->dev;
 284         struct videobuf_dma_sg_ops *ops=q->priv_ops;
 285
 286         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 287         if (!dma->sglen)
 288                 return 0;
 289
 290         if (!dma->bus_addr && ops && ops->vb_unmap_sg)
 291                         ops->vb_unmap_sg(dev,dma->sglist,dma->nr_pages,
 292                                                         dma->direction);
 293         kfree(dma->sglist);
 294         dma->sglist = NULL;
 295         dma->sglen = 0;
 296         return 0;
 297 }
 298
 299 int videobuf_dma_free(struct videobuf_dmabuf *dma)
 300 {
 301         MAGIC_CHECK(dma->magic,MAGIC_DMABUF);
 302         BUG_ON(dma->sglen);
 303
 304         if (dma->pages) {
 305                 int i;
 306                 for (i=0; i < dma->nr_pages; i++)
 307                         page_cache_release(dma->pages[i]);
 308                 kfree(dma->pages);
 309                 dma->pages = NULL;
 310         }
 311
 312         vfree(dma->vmalloc);
 313         dma->vmalloc = NULL;
 314         dma->varea = NULL;
 315
 316         if (dma->bus_addr) {
 317                 dma->bus_addr = 0;
 318         }
 319         dma->direction = PCI_DMA_NONE;
 320         return 0;
 321 }
 322
 323 /* --------------------------------------------------------------------- */
 324
 325 int videobuf_pci_dma_map(struct pci_dev *pci,struct videobuf_dmabuf *dma)
 326 {
 327         struct videobuf_queue q;
 328         struct videobuf_dma_sg_ops qops;
 329
 330         q.dev=pci;
 331         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 332         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 333         q.priv_ops = &qops;
 334
 335         return (videobuf_dma_map(&q,dma));
 336 }
 337
 338 int videobuf_pci_dma_unmap(struct pci_dev *pci,struct videobuf_dmabuf *dma)
 339 {
 340         struct videobuf_queue q;
 341         struct videobuf_dma_sg_ops qops;
 342
 343         q.dev=pci;
 344         qops.vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 345         qops.vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 346         q.priv_ops = &qops;
 347
 348         return (videobuf_dma_unmap(&q,dma));
 349 }
 350
 351 /* --------------------------------------------------------------------- */
 352
 353 static void
 354 videobuf_vm_open(struct vm_area_struct *vma)
 355 {
 356         struct videobuf_mapping *map = vma->vm_private_data;
 357
 358         dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
 359                 map->count,vma->vm_start,vma->vm_end);
 360         map->count++;
 361 }
 362
 363 static void
 364 videobuf_vm_close(struct vm_area_struct *vma)
 365 {
 366         struct videobuf_mapping *map = vma->vm_private_data;
 367         struct videobuf_queue *q = map->q;
 368         struct videbuf_pci_sg_memory *mem;
 369         int i;
 370
 371         dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
 372                 map->count,vma->vm_start,vma->vm_end);
 373
 374         map->count--;
 375         if (0 == map->count) {
 376                 dprintk(1,"munmap %p q=%p\n",map,q);
 377                 mutex_lock(&q->lock);
 378                 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 379                         if (NULL == q->bufs[i])
 380                                 continue;
 381                         mem=q->bufs[i]->priv;
 382
 383                         if (!mem)
 384                                 continue;
 385
 386                         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 387
 388                         if (q->bufs[i]->map != map)
 389                                 continue;
 390                         q->bufs[i]->map   = NULL;
 391                         q->bufs[i]->baddr = 0;
 392                         q->ops->buf_release(q,q->bufs[i]);
 393                 }
 394                 mutex_unlock(&q->lock);
 395                 kfree(map);
 396         }
 397         return;
 398 }
 399
 400 /*
 401  * Get a anonymous page for the mapping.  Make sure we can DMA to that
 402  * memory location with 32bit PCI devices (i.e. don't use highmem for
 403  * now ...).  Bounce buffers don't work very well for the data rates
 404  * video capture has.
 405  */
 406 static struct page*
 407 videobuf_vm_nopage(struct vm_area_struct *vma, unsigned long vaddr,
 408                    int *type)
 409 {
 410         struct page *page;
 411
 412         dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
 413                 vaddr,vma->vm_start,vma->vm_end);
 414         if (vaddr > vma->vm_end)
 415                 return NOPAGE_SIGBUS;
 416         page = alloc_page(GFP_USER | __GFP_DMA32);
 417         if (!page)
 418                 return NOPAGE_OOM;
 419         clear_user_page(page_address(page), vaddr, page);
 420         if (type)
 421                 *type = VM_FAULT_MINOR;
 422         return page;
 423 }
 424
 425 static struct vm_operations_struct videobuf_vm_ops =
 426 {
 427         .open     = videobuf_vm_open,
 428         .close    = videobuf_vm_close,
 429         .nopage   = videobuf_vm_nopage,
 430 };
 431
 432 /* ---------------------------------------------------------------------
 433  * PCI handlers for the generic methods
 434  */
 435
 436 /* Allocated area consists on 3 parts:
 437         struct video_buffer
 438         struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
 439         struct videobuf_pci_sg_memory
 440  */
 441
 442 static void *__videobuf_alloc(size_t size)
 443 {
 444         struct videbuf_pci_sg_memory *mem;
 445         struct videobuf_buffer *vb;
 446
 447         vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
 448
 449         mem = vb->priv = ((char *)vb)+size;
 450         mem->magic=MAGIC_SG_MEM;
 451
 452         videobuf_dma_init(&mem->dma);
 453
 454         dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
 455                 __FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
 456                 mem,(long)sizeof(*mem));
 457
 458         return vb;
 459 }
 460
 461 static int __videobuf_iolock (struct videobuf_queue* q,
 462                               struct videobuf_buffer *vb,
 463                               struct v4l2_framebuffer *fbuf)
 464 {
 465         int err,pages;
 466         dma_addr_t bus;
 467         struct videbuf_pci_sg_memory *mem=vb->priv;
 468         BUG_ON(!mem);
 469
 470         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 471
 472         switch (vb->memory) {
 473         case V4L2_MEMORY_MMAP:
 474         case V4L2_MEMORY_USERPTR:
 475                 if (0 == vb->baddr) {
 476                         /* no userspace addr -- kernel bounce buffer */
 477                         pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
 478                         err = videobuf_dma_init_kernel( &mem->dma,
 479                                                         PCI_DMA_FROMDEVICE,
 480                                                         pages );
 481                         if (0 != err)
 482                                 return err;
 483                 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
 484                         /* dma directly to userspace */
 485                         err = videobuf_dma_init_user( &mem->dma,
 486                                                       PCI_DMA_FROMDEVICE,
 487                                                       vb->baddr,vb->bsize );
 488                         if (0 != err)
 489                                 return err;
 490                 } else {
 491                         /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
 492                         buffers can only be called from videobuf_qbuf
 493                         we take current->mm->mmap_sem there, to prevent
 494                         locking inversion, so don't take it here */
 495
 496                         err = videobuf_dma_init_user_locked(&mem->dma,
 497                                                       PCI_DMA_FROMDEVICE,
 498                                                       vb->baddr, vb->bsize);
 499                         if (0 != err)
 500                                 return err;
 501                 }
 502                 break;
 503         case V4L2_MEMORY_OVERLAY:
 504                 if (NULL == fbuf)
 505                         return -EINVAL;
 506                 /* FIXME: need sanity checks for vb->boff */
 507                 /*
 508                  * Using a double cast to avoid compiler warnings when
 509                  * building for PAE. Compiler doesn't like direct casting
 510                  * of a 32 bit ptr to 64 bit integer.
 511                  */
 512                 bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
 513                 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
 514                 err = videobuf_dma_init_overlay(&mem->dma,PCI_DMA_FROMDEVICE,
 515                                                 bus, pages);
 516                 if (0 != err)
 517                         return err;
 518                 break;
 519         default:
 520                 BUG();
 521         }
 522         err = videobuf_dma_map(q,&mem->dma);
 523         if (0 != err)
 524                 return err;
 525
 526         return 0;
 527 }
 528
 529 static int __videobuf_sync(struct videobuf_queue *q,
 530                            struct videobuf_buffer *buf)
 531 {
 532         struct videbuf_pci_sg_memory *mem=buf->priv;
 533         BUG_ON (!mem);
 534         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 535
 536         return  videobuf_dma_sync(q,&mem->dma);
 537 }
 538
 539 static int __videobuf_mmap_free(struct videobuf_queue *q)
 540 {
 541         int i;
 542
 543         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 544                 if (q->bufs[i]) {
 545                         if (q->bufs[i]->map)
 546                                 return -EBUSY;
 547                 }
 548         }
 549
 550         return 0;
 551 }
 552
 553 static int __videobuf_mmap_mapper(struct videobuf_queue *q,
 554                          struct vm_area_struct *vma)
 555 {
 556         struct videbuf_pci_sg_memory *mem;
 557         struct videobuf_mapping *map;
 558         unsigned int first,last,size,i;
 559         int retval;
 560
 561         retval = -EINVAL;
 562         if (!(vma->vm_flags & VM_WRITE)) {
 563                 dprintk(1,"mmap app bug: PROT_WRITE please\n");
 564                 goto done;
 565         }
 566         if (!(vma->vm_flags & VM_SHARED)) {
 567                 dprintk(1,"mmap app bug: MAP_SHARED please\n");
 568                 goto done;
 569         }
 570
 571         /* look for first buffer to map */
 572         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
 573                 if (NULL == q->bufs[first])
 574                         continue;
 575                 mem=q->bufs[first]->priv;
 576                 BUG_ON (!mem);
 577                 MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 578
 579                 if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
 580                         continue;
 581                 if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
 582                         break;
 583         }
 584         if (VIDEO_MAX_FRAME == first) {
 585                 dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
 586                         (vma->vm_pgoff << PAGE_SHIFT));
 587                 goto done;
 588         }
 589
 590         /* look for last buffer to map */
 591         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
 592                 if (NULL == q->bufs[last])
 593                         continue;
 594                 if (V4L2_MEMORY_MMAP != q->bufs[last]->memory)
 595                         continue;
 596                 if (q->bufs[last]->map) {
 597                         retval = -EBUSY;
 598                         goto done;
 599                 }
 600                 size += q->bufs[last]->bsize;
 601                 if (size == (vma->vm_end - vma->vm_start))
 602                         break;
 603         }
 604         if (VIDEO_MAX_FRAME == last) {
 605                 dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n",
 606                         (vma->vm_end - vma->vm_start));
 607                 goto done;
 608         }
 609
 610         /* create mapping + update buffer list */
 611         retval = -ENOMEM;
 612         map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
 613         if (NULL == map)
 614                 goto done;
 615         for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) {
 616                 q->bufs[i]->map   = map;
 617                 q->bufs[i]->baddr = vma->vm_start + size;
 618         }
 619         map->count    = 1;
 620         map->start    = vma->vm_start;
 621         map->end      = vma->vm_end;
 622         map->q        = q;
 623         vma->vm_ops   = &videobuf_vm_ops;
 624         vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
 625         vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
 626         vma->vm_private_data = map;
 627         dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
 628                 map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last);
 629         retval = 0;
 630
 631  done:
 632         return retval;
 633 }
 634
 635 static int __videobuf_copy_to_user ( struct videobuf_queue *q,
 636                                 char __user *data, size_t count,
 637                                 int nonblocking )
 638 {
 639         struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
 640         BUG_ON (!mem);
 641         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 642
 643         /* copy to userspace */
 644         if (count > q->read_buf->size - q->read_off)
 645                 count = q->read_buf->size - q->read_off;
 646
 647         if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count))
 648                 return -EFAULT;
 649
 650         return count;
 651 }
 652
 653 static int __videobuf_copy_stream ( struct videobuf_queue *q,
 654                                 char __user *data, size_t count, size_t pos,
 655                                 int vbihack, int nonblocking )
 656 {
 657         unsigned int  *fc;
 658         struct videbuf_pci_sg_memory *mem=q->read_buf->priv;
 659         BUG_ON (!mem);
 660         MAGIC_CHECK(mem->magic,MAGIC_SG_MEM);
 661
 662         if (vbihack) {
 663                 /* dirty, undocumented hack -- pass the frame counter
 664                         * within the last four bytes of each vbi data block.
 665                         * We need that one to maintain backward compatibility
 666                         * to all vbi decoding software out there ... */
 667                 fc  = (unsigned int*)mem->dma.vmalloc;
 668                 fc += (q->read_buf->size>>2) -1;
 669                 *fc = q->read_buf->field_count >> 1;
 670                 dprintk(1,"vbihack: %d\n",*fc);
 671         }
 672
 673         /* copy stuff using the common method */
 674         count = __videobuf_copy_to_user (q,data,count,nonblocking);
 675
 676         if ( (count==-EFAULT) && (0 == pos) )
 677                 return -EFAULT;
 678
 679         return count;
 680 }
 681
 682 static struct videobuf_qtype_ops pci_ops = {
 683         .magic        = MAGIC_QTYPE_OPS,
 684
 685         .alloc        = __videobuf_alloc,
 686         .iolock       = __videobuf_iolock,
 687         .sync         = __videobuf_sync,
 688         .mmap_free    = __videobuf_mmap_free,
 689         .mmap_mapper  = __videobuf_mmap_mapper,
 690         .copy_to_user = __videobuf_copy_to_user,
 691         .copy_stream  = __videobuf_copy_stream,
 692 };
 693
 694 void *videobuf_pci_alloc (size_t size)
 695 {
 696         struct videobuf_queue q;
 697
 698         /* Required to make generic handler to call __videobuf_alloc */
 699         q.int_ops=&pci_ops;
 700
 701         q.msize=size;
 702
 703         return videobuf_alloc (&q);
 704 }
 705
 706 void videobuf_queue_pci_init(struct videobuf_queue* q,
 707                          struct videobuf_queue_ops *ops,
 708                          void *dev,
 709                          spinlock_t *irqlock,
 710                          enum v4l2_buf_type type,
 711                          enum v4l2_field field,
 712                          unsigned int msize,
 713                          void *priv)
 714 {
 715         struct videobuf_dma_sg_ops *priv_ops;
 716
 717         videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
 718         q->int_ops=&pci_ops;
 719
 720         /* FIXME: the code bellow should be removed after having a proper
 721          * memory allocation method for vivi and tm6000
 722          */
 723         q->priv_ops= kzalloc(sizeof(struct videobuf_dma_sg_ops), GFP_KERNEL);
 724         BUG_ON (!q->priv_ops);
 725
 726         priv_ops=q->priv_ops;
 727
 728         /* Sets default methods for handling Scatter Gather mapping */
 729         priv_ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 730         priv_ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 731         priv_ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
 732 }
 733
 734 void videobuf_set_pci_ops (struct videobuf_queue* q,
 735                                 struct videobuf_dma_sg_ops *ops)
 736 {
 737         kfree (q->priv_ops);
 738
 739         q->priv_ops=ops;
 740
 741         if (!ops)
 742                 return;
 743
 744         /* If not specified, defaults to PCI map sg */
 745         if (!ops->vb_map_sg)
 746                 ops->vb_map_sg=(vb_map_sg_t *)pci_map_sg;
 747
 748         if (!ops->vb_dma_sync_sg)
 749                 ops->vb_dma_sync_sg=(vb_map_sg_t *)pci_dma_sync_sg_for_cpu;
 750         if (!ops->vb_unmap_sg)
 751                 ops->vb_unmap_sg=(vb_map_sg_t *)pci_unmap_sg;
 752 }
 753
 754
 755 /* --------------------------------------------------------------------- */
 756
 757 EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg);
 758
 759 EXPORT_SYMBOL_GPL(videobuf_to_dma);
 760 EXPORT_SYMBOL_GPL(videobuf_dma_init);
 761 EXPORT_SYMBOL_GPL(videobuf_dma_init_user);
 762 EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel);
 763 EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay);
 764 EXPORT_SYMBOL_GPL(videobuf_dma_map);
 765 EXPORT_SYMBOL_GPL(videobuf_dma_sync);
 766 EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
 767 EXPORT_SYMBOL_GPL(videobuf_dma_free);
 768
 769 EXPORT_SYMBOL_GPL(videobuf_pci_dma_map);
 770 EXPORT_SYMBOL_GPL(videobuf_pci_dma_unmap);
 771 EXPORT_SYMBOL_GPL(videobuf_pci_alloc);
 772
 773 EXPORT_SYMBOL_GPL(videobuf_queue_pci_init);
 774 EXPORT_SYMBOL_GPL(videobuf_set_pci_ops);
 775
 776 /*
 777  * Local variables:
 778  * c-basic-offset: 8
 779  * End:
 780  */