1 /** 2 * \file drm_bufs.c 3 * Generic buffer template 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 */ 8 9 /* 10 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com 11 * 12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 */ 35 36 #include <linux/vmalloc.h> 37 #include <linux/slab.h> 38 #include <linux/log2.h> 39 #include <linux/export.h> 40 #include <asm/shmparam.h> 41 #include <drm/drmP.h> 42 43 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev, 44 struct drm_local_map *map) 45 { 46 struct drm_map_list *entry; 47 list_for_each_entry(entry, &dev->maplist, head) { 48 /* 49 * Because the kernel-userspace ABI is fixed at a 32-bit offset 50 * while PCI resources may live above that, we only compare the 51 * lower 32 bits of the map offset for maps of type 52 * _DRM_FRAMEBUFFER or _DRM_REGISTERS. 53 * It is assumed that if a driver have more than one resource 54 * of each type, the lower 32 bits are different. 55 */ 56 if (!entry->map || 57 map->type != entry->map->type || 58 entry->master != dev->primary->master) 59 continue; 60 switch (map->type) { 61 case _DRM_SHM: 62 if (map->flags != _DRM_CONTAINS_LOCK) 63 break; 64 return entry; 65 case _DRM_REGISTERS: 66 case _DRM_FRAME_BUFFER: 67 if ((entry->map->offset & 0xffffffff) == 68 (map->offset & 0xffffffff)) 69 return entry; 70 default: /* Make gcc happy */ 71 ; 72 } 73 if (entry->map->offset == map->offset) 74 return entry; 75 } 76 77 return NULL; 78 } 79 80 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash, 81 unsigned long user_token, int hashed_handle, int shm) 82 { 83 int use_hashed_handle, shift; 84 unsigned long add; 85 86 #if (BITS_PER_LONG == 64) 87 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle); 88 #elif (BITS_PER_LONG == 32) 89 use_hashed_handle = hashed_handle; 90 #else 91 #error Unsupported long size. Neither 64 nor 32 bits. 92 #endif 93 94 if (!use_hashed_handle) { 95 int ret; 96 hash->key = user_token >> PAGE_SHIFT; 97 ret = drm_ht_insert_item(&dev->map_hash, hash); 98 if (ret != -EINVAL) 99 return ret; 100 } 101 102 shift = 0; 103 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT; 104 if (shm && (SHMLBA > PAGE_SIZE)) { 105 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1; 106 107 /* For shared memory, we have to preserve the SHMLBA 108 * bits of the eventual vma->vm_pgoff value during 109 * mmap(). Otherwise we run into cache aliasing problems 110 * on some platforms. On these platforms, the pgoff of 111 * a mmap() request is used to pick a suitable virtual 112 * address for the mmap() region such that it will not 113 * cause cache aliasing problems. 114 * 115 * Therefore, make sure the SHMLBA relevant bits of the 116 * hash value we use are equal to those in the original 117 * kernel virtual address. 118 */ 119 shift = bits; 120 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL)); 121 } 122 123 return drm_ht_just_insert_please(&dev->map_hash, hash, 124 user_token, 32 - PAGE_SHIFT - 3, 125 shift, add); 126 } 127 128 /** 129 * Core function to create a range of memory available for mapping by a 130 * non-root process. 131 * 132 * Adjusts the memory offset to its absolute value according to the mapping 133 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where 134 * applicable and if supported by the kernel. 135 */ 136 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset, 137 unsigned int size, enum drm_map_type type, 138 enum drm_map_flags flags, 139 struct drm_map_list ** maplist) 140 { 141 struct drm_local_map *map; 142 struct drm_map_list *list; 143 drm_dma_handle_t *dmah; 144 unsigned long user_token; 145 int ret; 146 147 map = kmalloc(sizeof(*map), GFP_KERNEL); 148 if (!map) 149 return -ENOMEM; 150 151 map->offset = offset; 152 map->size = size; 153 map->flags = flags; 154 map->type = type; 155 156 /* Only allow shared memory to be removable since we only keep enough 157 * book keeping information about shared memory to allow for removal 158 * when processes fork. 159 */ 160 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) { 161 kfree(map); 162 return -EINVAL; 163 } 164 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n", 165 (unsigned long long)map->offset, map->size, map->type); 166 167 /* page-align _DRM_SHM maps. They are allocated here so there is no security 168 * hole created by that and it works around various broken drivers that use 169 * a non-aligned quantity to map the SAREA. --BenH 170 */ 171 if (map->type == _DRM_SHM) 172 map->size = PAGE_ALIGN(map->size); 173 174 if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) { 175 kfree(map); 176 return -EINVAL; 177 } 178 map->mtrr = -1; 179 map->handle = NULL; 180 181 switch (map->type) { 182 case _DRM_REGISTERS: 183 case _DRM_FRAME_BUFFER: 184 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__) 185 if (map->offset + (map->size-1) < map->offset || 186 map->offset < virt_to_phys(high_memory)) { 187 kfree(map); 188 return -EINVAL; 189 } 190 #endif 191 /* Some drivers preinitialize some maps, without the X Server 192 * needing to be aware of it. Therefore, we just return success 193 * when the server tries to create a duplicate map. 194 */ 195 list = drm_find_matching_map(dev, map); 196 if (list != NULL) { 197 if (list->map->size != map->size) { 198 DRM_DEBUG("Matching maps of type %d with " 199 "mismatched sizes, (%ld vs %ld)\n", 200 map->type, map->size, 201 list->map->size); 202 list->map->size = map->size; 203 } 204 205 kfree(map); 206 *maplist = list; 207 return 0; 208 } 209 210 if (map->type == _DRM_FRAME_BUFFER || 211 (map->flags & _DRM_WRITE_COMBINING)) { 212 map->mtrr = 213 arch_phys_wc_add(map->offset, map->size); 214 } 215 if (map->type == _DRM_REGISTERS) { 216 if (map->flags & _DRM_WRITE_COMBINING) 217 map->handle = ioremap_wc(map->offset, 218 map->size); 219 else 220 map->handle = ioremap(map->offset, map->size); 221 if (!map->handle) { 222 kfree(map); 223 return -ENOMEM; 224 } 225 } 226 227 break; 228 case _DRM_SHM: 229 list = drm_find_matching_map(dev, map); 230 if (list != NULL) { 231 if(list->map->size != map->size) { 232 DRM_DEBUG("Matching maps of type %d with " 233 "mismatched sizes, (%ld vs %ld)\n", 234 map->type, map->size, list->map->size); 235 list->map->size = map->size; 236 } 237 238 kfree(map); 239 *maplist = list; 240 return 0; 241 } 242 map->handle = vmalloc_user(map->size); 243 DRM_DEBUG("%lu %d %p\n", 244 map->size, order_base_2(map->size), map->handle); 245 if (!map->handle) { 246 kfree(map); 247 return -ENOMEM; 248 } 249 map->offset = (unsigned long)map->handle; 250 if (map->flags & _DRM_CONTAINS_LOCK) { 251 /* Prevent a 2nd X Server from creating a 2nd lock */ 252 if (dev->primary->master->lock.hw_lock != NULL) { 253 vfree(map->handle); 254 kfree(map); 255 return -EBUSY; 256 } 257 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */ 258 } 259 break; 260 case _DRM_AGP: { 261 struct drm_agp_mem *entry; 262 int valid = 0; 263 264 if (!dev->agp) { 265 kfree(map); 266 return -EINVAL; 267 } 268 #ifdef __alpha__ 269 map->offset += dev->hose->mem_space->start; 270 #endif 271 /* In some cases (i810 driver), user space may have already 272 * added the AGP base itself, because dev->agp->base previously 273 * only got set during AGP enable. So, only add the base 274 * address if the map's offset isn't already within the 275 * aperture. 276 */ 277 if (map->offset < dev->agp->base || 278 map->offset > dev->agp->base + 279 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) { 280 map->offset += dev->agp->base; 281 } 282 map->mtrr = dev->agp->agp_mtrr; /* for getmap */ 283 284 /* This assumes the DRM is in total control of AGP space. 285 * It's not always the case as AGP can be in the control 286 * of user space (i.e. i810 driver). So this loop will get 287 * skipped and we double check that dev->agp->memory is 288 * actually set as well as being invalid before EPERM'ing 289 */ 290 list_for_each_entry(entry, &dev->agp->memory, head) { 291 if ((map->offset >= entry->bound) && 292 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) { 293 valid = 1; 294 break; 295 } 296 } 297 if (!list_empty(&dev->agp->memory) && !valid) { 298 kfree(map); 299 return -EPERM; 300 } 301 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n", 302 (unsigned long long)map->offset, map->size); 303 304 break; 305 } 306 case _DRM_SCATTER_GATHER: 307 if (!dev->sg) { 308 kfree(map); 309 return -EINVAL; 310 } 311 map->offset += (unsigned long)dev->sg->virtual; 312 break; 313 case _DRM_CONSISTENT: 314 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G, 315 * As we're limiting the address to 2^32-1 (or less), 316 * casting it down to 32 bits is no problem, but we 317 * need to point to a 64bit variable first. */ 318 dmah = drm_pci_alloc(dev, map->size, map->size); 319 if (!dmah) { 320 kfree(map); 321 return -ENOMEM; 322 } 323 map->handle = dmah->vaddr; 324 map->offset = (unsigned long)dmah->busaddr; 325 kfree(dmah); 326 break; 327 default: 328 kfree(map); 329 return -EINVAL; 330 } 331 332 list = kzalloc(sizeof(*list), GFP_KERNEL); 333 if (!list) { 334 if (map->type == _DRM_REGISTERS) 335 iounmap(map->handle); 336 kfree(map); 337 return -EINVAL; 338 } 339 list->map = map; 340 341 mutex_lock(&dev->struct_mutex); 342 list_add(&list->head, &dev->maplist); 343 344 /* Assign a 32-bit handle */ 345 /* We do it here so that dev->struct_mutex protects the increment */ 346 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle : 347 map->offset; 348 ret = drm_map_handle(dev, &list->hash, user_token, 0, 349 (map->type == _DRM_SHM)); 350 if (ret) { 351 if (map->type == _DRM_REGISTERS) 352 iounmap(map->handle); 353 kfree(map); 354 kfree(list); 355 mutex_unlock(&dev->struct_mutex); 356 return ret; 357 } 358 359 list->user_token = list->hash.key << PAGE_SHIFT; 360 mutex_unlock(&dev->struct_mutex); 361 362 if (!(map->flags & _DRM_DRIVER)) 363 list->master = dev->primary->master; 364 *maplist = list; 365 return 0; 366 } 367 368 int drm_addmap(struct drm_device * dev, resource_size_t offset, 369 unsigned int size, enum drm_map_type type, 370 enum drm_map_flags flags, struct drm_local_map ** map_ptr) 371 { 372 struct drm_map_list *list; 373 int rc; 374 375 rc = drm_addmap_core(dev, offset, size, type, flags, &list); 376 if (!rc) 377 *map_ptr = list->map; 378 return rc; 379 } 380 381 EXPORT_SYMBOL(drm_addmap); 382 383 /** 384 * Ioctl to specify a range of memory that is available for mapping by a 385 * non-root process. 386 * 387 * \param inode device inode. 388 * \param file_priv DRM file private. 389 * \param cmd command. 390 * \param arg pointer to a drm_map structure. 391 * \return zero on success or a negative value on error. 392 * 393 */ 394 int drm_addmap_ioctl(struct drm_device *dev, void *data, 395 struct drm_file *file_priv) 396 { 397 struct drm_map *map = data; 398 struct drm_map_list *maplist; 399 int err; 400 401 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM)) 402 return -EPERM; 403 404 err = drm_addmap_core(dev, map->offset, map->size, map->type, 405 map->flags, &maplist); 406 407 if (err) 408 return err; 409 410 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */ 411 map->handle = (void *)(unsigned long)maplist->user_token; 412 413 /* 414 * It appears that there are no users of this value whatsoever -- 415 * drmAddMap just discards it. Let's not encourage its use. 416 * (Keeping drm_addmap_core's returned mtrr value would be wrong -- 417 * it's not a real mtrr index anymore.) 418 */ 419 map->mtrr = -1; 420 421 return 0; 422 } 423 424 /** 425 * Remove a map private from list and deallocate resources if the mapping 426 * isn't in use. 427 * 428 * Searches the map on drm_device::maplist, removes it from the list, see if 429 * its being used, and free any associate resource (such as MTRR's) if it's not 430 * being on use. 431 * 432 * \sa drm_addmap 433 */ 434 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map) 435 { 436 struct drm_map_list *r_list = NULL, *list_t; 437 drm_dma_handle_t dmah; 438 int found = 0; 439 struct drm_master *master; 440 441 /* Find the list entry for the map and remove it */ 442 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) { 443 if (r_list->map == map) { 444 master = r_list->master; 445 list_del(&r_list->head); 446 drm_ht_remove_key(&dev->map_hash, 447 r_list->user_token >> PAGE_SHIFT); 448 kfree(r_list); 449 found = 1; 450 break; 451 } 452 } 453 454 if (!found) 455 return -EINVAL; 456 457 switch (map->type) { 458 case _DRM_REGISTERS: 459 iounmap(map->handle); 460 /* FALLTHROUGH */ 461 case _DRM_FRAME_BUFFER: 462 arch_phys_wc_del(map->mtrr); 463 break; 464 case _DRM_SHM: 465 vfree(map->handle); 466 if (master) { 467 if (dev->sigdata.lock == master->lock.hw_lock) 468 dev->sigdata.lock = NULL; 469 master->lock.hw_lock = NULL; /* SHM removed */ 470 master->lock.file_priv = NULL; 471 wake_up_interruptible_all(&master->lock.lock_queue); 472 } 473 break; 474 case _DRM_AGP: 475 case _DRM_SCATTER_GATHER: 476 break; 477 case _DRM_CONSISTENT: 478 dmah.vaddr = map->handle; 479 dmah.busaddr = map->offset; 480 dmah.size = map->size; 481 __drm_pci_free(dev, &dmah); 482 break; 483 } 484 kfree(map); 485 486 return 0; 487 } 488 EXPORT_SYMBOL(drm_rmmap_locked); 489 490 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map) 491 { 492 int ret; 493 494 mutex_lock(&dev->struct_mutex); 495 ret = drm_rmmap_locked(dev, map); 496 mutex_unlock(&dev->struct_mutex); 497 498 return ret; 499 } 500 EXPORT_SYMBOL(drm_rmmap); 501 502 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on 503 * the last close of the device, and this is necessary for cleanup when things 504 * exit uncleanly. Therefore, having userland manually remove mappings seems 505 * like a pointless exercise since they're going away anyway. 506 * 507 * One use case might be after addmap is allowed for normal users for SHM and 508 * gets used by drivers that the server doesn't need to care about. This seems 509 * unlikely. 510 * 511 * \param inode device inode. 512 * \param file_priv DRM file private. 513 * \param cmd command. 514 * \param arg pointer to a struct drm_map structure. 515 * \return zero on success or a negative value on error. 516 */ 517 int drm_rmmap_ioctl(struct drm_device *dev, void *data, 518 struct drm_file *file_priv) 519 { 520 struct drm_map *request = data; 521 struct drm_local_map *map = NULL; 522 struct drm_map_list *r_list; 523 int ret; 524 525 mutex_lock(&dev->struct_mutex); 526 list_for_each_entry(r_list, &dev->maplist, head) { 527 if (r_list->map && 528 r_list->user_token == (unsigned long)request->handle && 529 r_list->map->flags & _DRM_REMOVABLE) { 530 map = r_list->map; 531 break; 532 } 533 } 534 535 /* List has wrapped around to the head pointer, or its empty we didn't 536 * find anything. 537 */ 538 if (list_empty(&dev->maplist) || !map) { 539 mutex_unlock(&dev->struct_mutex); 540 return -EINVAL; 541 } 542 543 /* Register and framebuffer maps are permanent */ 544 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) { 545 mutex_unlock(&dev->struct_mutex); 546 return 0; 547 } 548 549 ret = drm_rmmap_locked(dev, map); 550 551 mutex_unlock(&dev->struct_mutex); 552 553 return ret; 554 } 555 556 /** 557 * Cleanup after an error on one of the addbufs() functions. 558 * 559 * \param dev DRM device. 560 * \param entry buffer entry where the error occurred. 561 * 562 * Frees any pages and buffers associated with the given entry. 563 */ 564 static void drm_cleanup_buf_error(struct drm_device * dev, 565 struct drm_buf_entry * entry) 566 { 567 int i; 568 569 if (entry->seg_count) { 570 for (i = 0; i < entry->seg_count; i++) { 571 if (entry->seglist[i]) { 572 drm_pci_free(dev, entry->seglist[i]); 573 } 574 } 575 kfree(entry->seglist); 576 577 entry->seg_count = 0; 578 } 579 580 if (entry->buf_count) { 581 for (i = 0; i < entry->buf_count; i++) { 582 kfree(entry->buflist[i].dev_private); 583 } 584 kfree(entry->buflist); 585 586 entry->buf_count = 0; 587 } 588 } 589 590 #if __OS_HAS_AGP 591 /** 592 * Add AGP buffers for DMA transfers. 593 * 594 * \param dev struct drm_device to which the buffers are to be added. 595 * \param request pointer to a struct drm_buf_desc describing the request. 596 * \return zero on success or a negative number on failure. 597 * 598 * After some sanity checks creates a drm_buf structure for each buffer and 599 * reallocates the buffer list of the same size order to accommodate the new 600 * buffers. 601 */ 602 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request) 603 { 604 struct drm_device_dma *dma = dev->dma; 605 struct drm_buf_entry *entry; 606 struct drm_agp_mem *agp_entry; 607 struct drm_buf *buf; 608 unsigned long offset; 609 unsigned long agp_offset; 610 int count; 611 int order; 612 int size; 613 int alignment; 614 int page_order; 615 int total; 616 int byte_count; 617 int i, valid; 618 struct drm_buf **temp_buflist; 619 620 if (!dma) 621 return -EINVAL; 622 623 count = request->count; 624 order = order_base_2(request->size); 625 size = 1 << order; 626 627 alignment = (request->flags & _DRM_PAGE_ALIGN) 628 ? PAGE_ALIGN(size) : size; 629 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 630 total = PAGE_SIZE << page_order; 631 632 byte_count = 0; 633 agp_offset = dev->agp->base + request->agp_start; 634 635 DRM_DEBUG("count: %d\n", count); 636 DRM_DEBUG("order: %d\n", order); 637 DRM_DEBUG("size: %d\n", size); 638 DRM_DEBUG("agp_offset: %lx\n", agp_offset); 639 DRM_DEBUG("alignment: %d\n", alignment); 640 DRM_DEBUG("page_order: %d\n", page_order); 641 DRM_DEBUG("total: %d\n", total); 642 643 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 644 return -EINVAL; 645 646 /* Make sure buffers are located in AGP memory that we own */ 647 valid = 0; 648 list_for_each_entry(agp_entry, &dev->agp->memory, head) { 649 if ((agp_offset >= agp_entry->bound) && 650 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) { 651 valid = 1; 652 break; 653 } 654 } 655 if (!list_empty(&dev->agp->memory) && !valid) { 656 DRM_DEBUG("zone invalid\n"); 657 return -EINVAL; 658 } 659 spin_lock(&dev->buf_lock); 660 if (dev->buf_use) { 661 spin_unlock(&dev->buf_lock); 662 return -EBUSY; 663 } 664 atomic_inc(&dev->buf_alloc); 665 spin_unlock(&dev->buf_lock); 666 667 mutex_lock(&dev->struct_mutex); 668 entry = &dma->bufs[order]; 669 if (entry->buf_count) { 670 mutex_unlock(&dev->struct_mutex); 671 atomic_dec(&dev->buf_alloc); 672 return -ENOMEM; /* May only call once for each order */ 673 } 674 675 if (count < 0 || count > 4096) { 676 mutex_unlock(&dev->struct_mutex); 677 atomic_dec(&dev->buf_alloc); 678 return -EINVAL; 679 } 680 681 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL); 682 if (!entry->buflist) { 683 mutex_unlock(&dev->struct_mutex); 684 atomic_dec(&dev->buf_alloc); 685 return -ENOMEM; 686 } 687 688 entry->buf_size = size; 689 entry->page_order = page_order; 690 691 offset = 0; 692 693 while (entry->buf_count < count) { 694 buf = &entry->buflist[entry->buf_count]; 695 buf->idx = dma->buf_count + entry->buf_count; 696 buf->total = alignment; 697 buf->order = order; 698 buf->used = 0; 699 700 buf->offset = (dma->byte_count + offset); 701 buf->bus_address = agp_offset + offset; 702 buf->address = (void *)(agp_offset + offset); 703 buf->next = NULL; 704 buf->waiting = 0; 705 buf->pending = 0; 706 buf->file_priv = NULL; 707 708 buf->dev_priv_size = dev->driver->dev_priv_size; 709 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL); 710 if (!buf->dev_private) { 711 /* Set count correctly so we free the proper amount. */ 712 entry->buf_count = count; 713 drm_cleanup_buf_error(dev, entry); 714 mutex_unlock(&dev->struct_mutex); 715 atomic_dec(&dev->buf_alloc); 716 return -ENOMEM; 717 } 718 719 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); 720 721 offset += alignment; 722 entry->buf_count++; 723 byte_count += PAGE_SIZE << page_order; 724 } 725 726 DRM_DEBUG("byte_count: %d\n", byte_count); 727 728 temp_buflist = krealloc(dma->buflist, 729 (dma->buf_count + entry->buf_count) * 730 sizeof(*dma->buflist), GFP_KERNEL); 731 if (!temp_buflist) { 732 /* Free the entry because it isn't valid */ 733 drm_cleanup_buf_error(dev, entry); 734 mutex_unlock(&dev->struct_mutex); 735 atomic_dec(&dev->buf_alloc); 736 return -ENOMEM; 737 } 738 dma->buflist = temp_buflist; 739 740 for (i = 0; i < entry->buf_count; i++) { 741 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 742 } 743 744 dma->buf_count += entry->buf_count; 745 dma->seg_count += entry->seg_count; 746 dma->page_count += byte_count >> PAGE_SHIFT; 747 dma->byte_count += byte_count; 748 749 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); 750 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); 751 752 mutex_unlock(&dev->struct_mutex); 753 754 request->count = entry->buf_count; 755 request->size = size; 756 757 dma->flags = _DRM_DMA_USE_AGP; 758 759 atomic_dec(&dev->buf_alloc); 760 return 0; 761 } 762 EXPORT_SYMBOL(drm_addbufs_agp); 763 #endif /* __OS_HAS_AGP */ 764 765 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request) 766 { 767 struct drm_device_dma *dma = dev->dma; 768 int count; 769 int order; 770 int size; 771 int total; 772 int page_order; 773 struct drm_buf_entry *entry; 774 drm_dma_handle_t *dmah; 775 struct drm_buf *buf; 776 int alignment; 777 unsigned long offset; 778 int i; 779 int byte_count; 780 int page_count; 781 unsigned long *temp_pagelist; 782 struct drm_buf **temp_buflist; 783 784 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA)) 785 return -EINVAL; 786 787 if (!dma) 788 return -EINVAL; 789 790 if (!capable(CAP_SYS_ADMIN)) 791 return -EPERM; 792 793 count = request->count; 794 order = order_base_2(request->size); 795 size = 1 << order; 796 797 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n", 798 request->count, request->size, size, order); 799 800 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 801 return -EINVAL; 802 803 alignment = (request->flags & _DRM_PAGE_ALIGN) 804 ? PAGE_ALIGN(size) : size; 805 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 806 total = PAGE_SIZE << page_order; 807 808 spin_lock(&dev->buf_lock); 809 if (dev->buf_use) { 810 spin_unlock(&dev->buf_lock); 811 return -EBUSY; 812 } 813 atomic_inc(&dev->buf_alloc); 814 spin_unlock(&dev->buf_lock); 815 816 mutex_lock(&dev->struct_mutex); 817 entry = &dma->bufs[order]; 818 if (entry->buf_count) { 819 mutex_unlock(&dev->struct_mutex); 820 atomic_dec(&dev->buf_alloc); 821 return -ENOMEM; /* May only call once for each order */ 822 } 823 824 if (count < 0 || count > 4096) { 825 mutex_unlock(&dev->struct_mutex); 826 atomic_dec(&dev->buf_alloc); 827 return -EINVAL; 828 } 829 830 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL); 831 if (!entry->buflist) { 832 mutex_unlock(&dev->struct_mutex); 833 atomic_dec(&dev->buf_alloc); 834 return -ENOMEM; 835 } 836 837 entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL); 838 if (!entry->seglist) { 839 kfree(entry->buflist); 840 mutex_unlock(&dev->struct_mutex); 841 atomic_dec(&dev->buf_alloc); 842 return -ENOMEM; 843 } 844 845 /* Keep the original pagelist until we know all the allocations 846 * have succeeded 847 */ 848 temp_pagelist = kmalloc((dma->page_count + (count << page_order)) * 849 sizeof(*dma->pagelist), GFP_KERNEL); 850 if (!temp_pagelist) { 851 kfree(entry->buflist); 852 kfree(entry->seglist); 853 mutex_unlock(&dev->struct_mutex); 854 atomic_dec(&dev->buf_alloc); 855 return -ENOMEM; 856 } 857 memcpy(temp_pagelist, 858 dma->pagelist, dma->page_count * sizeof(*dma->pagelist)); 859 DRM_DEBUG("pagelist: %d entries\n", 860 dma->page_count + (count << page_order)); 861 862 entry->buf_size = size; 863 entry->page_order = page_order; 864 byte_count = 0; 865 page_count = 0; 866 867 while (entry->buf_count < count) { 868 869 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000); 870 871 if (!dmah) { 872 /* Set count correctly so we free the proper amount. */ 873 entry->buf_count = count; 874 entry->seg_count = count; 875 drm_cleanup_buf_error(dev, entry); 876 kfree(temp_pagelist); 877 mutex_unlock(&dev->struct_mutex); 878 atomic_dec(&dev->buf_alloc); 879 return -ENOMEM; 880 } 881 entry->seglist[entry->seg_count++] = dmah; 882 for (i = 0; i < (1 << page_order); i++) { 883 DRM_DEBUG("page %d @ 0x%08lx\n", 884 dma->page_count + page_count, 885 (unsigned long)dmah->vaddr + PAGE_SIZE * i); 886 temp_pagelist[dma->page_count + page_count++] 887 = (unsigned long)dmah->vaddr + PAGE_SIZE * i; 888 } 889 for (offset = 0; 890 offset + size <= total && entry->buf_count < count; 891 offset += alignment, ++entry->buf_count) { 892 buf = &entry->buflist[entry->buf_count]; 893 buf->idx = dma->buf_count + entry->buf_count; 894 buf->total = alignment; 895 buf->order = order; 896 buf->used = 0; 897 buf->offset = (dma->byte_count + byte_count + offset); 898 buf->address = (void *)(dmah->vaddr + offset); 899 buf->bus_address = dmah->busaddr + offset; 900 buf->next = NULL; 901 buf->waiting = 0; 902 buf->pending = 0; 903 buf->file_priv = NULL; 904 905 buf->dev_priv_size = dev->driver->dev_priv_size; 906 buf->dev_private = kzalloc(buf->dev_priv_size, 907 GFP_KERNEL); 908 if (!buf->dev_private) { 909 /* Set count correctly so we free the proper amount. */ 910 entry->buf_count = count; 911 entry->seg_count = count; 912 drm_cleanup_buf_error(dev, entry); 913 kfree(temp_pagelist); 914 mutex_unlock(&dev->struct_mutex); 915 atomic_dec(&dev->buf_alloc); 916 return -ENOMEM; 917 } 918 919 DRM_DEBUG("buffer %d @ %p\n", 920 entry->buf_count, buf->address); 921 } 922 byte_count += PAGE_SIZE << page_order; 923 } 924 925 temp_buflist = krealloc(dma->buflist, 926 (dma->buf_count + entry->buf_count) * 927 sizeof(*dma->buflist), GFP_KERNEL); 928 if (!temp_buflist) { 929 /* Free the entry because it isn't valid */ 930 drm_cleanup_buf_error(dev, entry); 931 kfree(temp_pagelist); 932 mutex_unlock(&dev->struct_mutex); 933 atomic_dec(&dev->buf_alloc); 934 return -ENOMEM; 935 } 936 dma->buflist = temp_buflist; 937 938 for (i = 0; i < entry->buf_count; i++) { 939 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 940 } 941 942 /* No allocations failed, so now we can replace the original pagelist 943 * with the new one. 944 */ 945 if (dma->page_count) { 946 kfree(dma->pagelist); 947 } 948 dma->pagelist = temp_pagelist; 949 950 dma->buf_count += entry->buf_count; 951 dma->seg_count += entry->seg_count; 952 dma->page_count += entry->seg_count << page_order; 953 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order); 954 955 mutex_unlock(&dev->struct_mutex); 956 957 request->count = entry->buf_count; 958 request->size = size; 959 960 if (request->flags & _DRM_PCI_BUFFER_RO) 961 dma->flags = _DRM_DMA_USE_PCI_RO; 962 963 atomic_dec(&dev->buf_alloc); 964 return 0; 965 966 } 967 EXPORT_SYMBOL(drm_addbufs_pci); 968 969 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request) 970 { 971 struct drm_device_dma *dma = dev->dma; 972 struct drm_buf_entry *entry; 973 struct drm_buf *buf; 974 unsigned long offset; 975 unsigned long agp_offset; 976 int count; 977 int order; 978 int size; 979 int alignment; 980 int page_order; 981 int total; 982 int byte_count; 983 int i; 984 struct drm_buf **temp_buflist; 985 986 if (!drm_core_check_feature(dev, DRIVER_SG)) 987 return -EINVAL; 988 989 if (!dma) 990 return -EINVAL; 991 992 if (!capable(CAP_SYS_ADMIN)) 993 return -EPERM; 994 995 count = request->count; 996 order = order_base_2(request->size); 997 size = 1 << order; 998 999 alignment = (request->flags & _DRM_PAGE_ALIGN) 1000 ? PAGE_ALIGN(size) : size; 1001 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 1002 total = PAGE_SIZE << page_order; 1003 1004 byte_count = 0; 1005 agp_offset = request->agp_start; 1006 1007 DRM_DEBUG("count: %d\n", count); 1008 DRM_DEBUG("order: %d\n", order); 1009 DRM_DEBUG("size: %d\n", size); 1010 DRM_DEBUG("agp_offset: %lu\n", agp_offset); 1011 DRM_DEBUG("alignment: %d\n", alignment); 1012 DRM_DEBUG("page_order: %d\n", page_order); 1013 DRM_DEBUG("total: %d\n", total); 1014 1015 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 1016 return -EINVAL; 1017 1018 spin_lock(&dev->buf_lock); 1019 if (dev->buf_use) { 1020 spin_unlock(&dev->buf_lock); 1021 return -EBUSY; 1022 } 1023 atomic_inc(&dev->buf_alloc); 1024 spin_unlock(&dev->buf_lock); 1025 1026 mutex_lock(&dev->struct_mutex); 1027 entry = &dma->bufs[order]; 1028 if (entry->buf_count) { 1029 mutex_unlock(&dev->struct_mutex); 1030 atomic_dec(&dev->buf_alloc); 1031 return -ENOMEM; /* May only call once for each order */ 1032 } 1033 1034 if (count < 0 || count > 4096) { 1035 mutex_unlock(&dev->struct_mutex); 1036 atomic_dec(&dev->buf_alloc); 1037 return -EINVAL; 1038 } 1039 1040 entry->buflist = kzalloc(count * sizeof(*entry->buflist), 1041 GFP_KERNEL); 1042 if (!entry->buflist) { 1043 mutex_unlock(&dev->struct_mutex); 1044 atomic_dec(&dev->buf_alloc); 1045 return -ENOMEM; 1046 } 1047 1048 entry->buf_size = size; 1049 entry->page_order = page_order; 1050 1051 offset = 0; 1052 1053 while (entry->buf_count < count) { 1054 buf = &entry->buflist[entry->buf_count]; 1055 buf->idx = dma->buf_count + entry->buf_count; 1056 buf->total = alignment; 1057 buf->order = order; 1058 buf->used = 0; 1059 1060 buf->offset = (dma->byte_count + offset); 1061 buf->bus_address = agp_offset + offset; 1062 buf->address = (void *)(agp_offset + offset 1063 + (unsigned long)dev->sg->virtual); 1064 buf->next = NULL; 1065 buf->waiting = 0; 1066 buf->pending = 0; 1067 buf->file_priv = NULL; 1068 1069 buf->dev_priv_size = dev->driver->dev_priv_size; 1070 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL); 1071 if (!buf->dev_private) { 1072 /* Set count correctly so we free the proper amount. */ 1073 entry->buf_count = count; 1074 drm_cleanup_buf_error(dev, entry); 1075 mutex_unlock(&dev->struct_mutex); 1076 atomic_dec(&dev->buf_alloc); 1077 return -ENOMEM; 1078 } 1079 1080 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); 1081 1082 offset += alignment; 1083 entry->buf_count++; 1084 byte_count += PAGE_SIZE << page_order; 1085 } 1086 1087 DRM_DEBUG("byte_count: %d\n", byte_count); 1088 1089 temp_buflist = krealloc(dma->buflist, 1090 (dma->buf_count + entry->buf_count) * 1091 sizeof(*dma->buflist), GFP_KERNEL); 1092 if (!temp_buflist) { 1093 /* Free the entry because it isn't valid */ 1094 drm_cleanup_buf_error(dev, entry); 1095 mutex_unlock(&dev->struct_mutex); 1096 atomic_dec(&dev->buf_alloc); 1097 return -ENOMEM; 1098 } 1099 dma->buflist = temp_buflist; 1100 1101 for (i = 0; i < entry->buf_count; i++) { 1102 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 1103 } 1104 1105 dma->buf_count += entry->buf_count; 1106 dma->seg_count += entry->seg_count; 1107 dma->page_count += byte_count >> PAGE_SHIFT; 1108 dma->byte_count += byte_count; 1109 1110 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); 1111 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); 1112 1113 mutex_unlock(&dev->struct_mutex); 1114 1115 request->count = entry->buf_count; 1116 request->size = size; 1117 1118 dma->flags = _DRM_DMA_USE_SG; 1119 1120 atomic_dec(&dev->buf_alloc); 1121 return 0; 1122 } 1123 1124 /** 1125 * Add buffers for DMA transfers (ioctl). 1126 * 1127 * \param inode device inode. 1128 * \param file_priv DRM file private. 1129 * \param cmd command. 1130 * \param arg pointer to a struct drm_buf_desc request. 1131 * \return zero on success or a negative number on failure. 1132 * 1133 * According with the memory type specified in drm_buf_desc::flags and the 1134 * build options, it dispatches the call either to addbufs_agp(), 1135 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent 1136 * PCI memory respectively. 1137 */ 1138 int drm_addbufs(struct drm_device *dev, void *data, 1139 struct drm_file *file_priv) 1140 { 1141 struct drm_buf_desc *request = data; 1142 int ret; 1143 1144 if (drm_core_check_feature(dev, DRIVER_MODESET)) 1145 return -EINVAL; 1146 1147 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1148 return -EINVAL; 1149 1150 #if __OS_HAS_AGP 1151 if (request->flags & _DRM_AGP_BUFFER) 1152 ret = drm_addbufs_agp(dev, request); 1153 else 1154 #endif 1155 if (request->flags & _DRM_SG_BUFFER) 1156 ret = drm_addbufs_sg(dev, request); 1157 else if (request->flags & _DRM_FB_BUFFER) 1158 ret = -EINVAL; 1159 else 1160 ret = drm_addbufs_pci(dev, request); 1161 1162 return ret; 1163 } 1164 1165 /** 1166 * Get information about the buffer mappings. 1167 * 1168 * This was originally mean for debugging purposes, or by a sophisticated 1169 * client library to determine how best to use the available buffers (e.g., 1170 * large buffers can be used for image transfer). 1171 * 1172 * \param inode device inode. 1173 * \param file_priv DRM file private. 1174 * \param cmd command. 1175 * \param arg pointer to a drm_buf_info structure. 1176 * \return zero on success or a negative number on failure. 1177 * 1178 * Increments drm_device::buf_use while holding the drm_device::buf_lock 1179 * lock, preventing of allocating more buffers after this call. Information 1180 * about each requested buffer is then copied into user space. 1181 */ 1182 int drm_infobufs(struct drm_device *dev, void *data, 1183 struct drm_file *file_priv) 1184 { 1185 struct drm_device_dma *dma = dev->dma; 1186 struct drm_buf_info *request = data; 1187 int i; 1188 int count; 1189 1190 if (drm_core_check_feature(dev, DRIVER_MODESET)) 1191 return -EINVAL; 1192 1193 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1194 return -EINVAL; 1195 1196 if (!dma) 1197 return -EINVAL; 1198 1199 spin_lock(&dev->buf_lock); 1200 if (atomic_read(&dev->buf_alloc)) { 1201 spin_unlock(&dev->buf_lock); 1202 return -EBUSY; 1203 } 1204 ++dev->buf_use; /* Can't allocate more after this call */ 1205 spin_unlock(&dev->buf_lock); 1206 1207 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { 1208 if (dma->bufs[i].buf_count) 1209 ++count; 1210 } 1211 1212 DRM_DEBUG("count = %d\n", count); 1213 1214 if (request->count >= count) { 1215 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { 1216 if (dma->bufs[i].buf_count) { 1217 struct drm_buf_desc __user *to = 1218 &request->list[count]; 1219 struct drm_buf_entry *from = &dma->bufs[i]; 1220 struct drm_freelist *list = &dma->bufs[i].freelist; 1221 if (copy_to_user(&to->count, 1222 &from->buf_count, 1223 sizeof(from->buf_count)) || 1224 copy_to_user(&to->size, 1225 &from->buf_size, 1226 sizeof(from->buf_size)) || 1227 copy_to_user(&to->low_mark, 1228 &list->low_mark, 1229 sizeof(list->low_mark)) || 1230 copy_to_user(&to->high_mark, 1231 &list->high_mark, 1232 sizeof(list->high_mark))) 1233 return -EFAULT; 1234 1235 DRM_DEBUG("%d %d %d %d %d\n", 1236 i, 1237 dma->bufs[i].buf_count, 1238 dma->bufs[i].buf_size, 1239 dma->bufs[i].freelist.low_mark, 1240 dma->bufs[i].freelist.high_mark); 1241 ++count; 1242 } 1243 } 1244 } 1245 request->count = count; 1246 1247 return 0; 1248 } 1249 1250 /** 1251 * Specifies a low and high water mark for buffer allocation 1252 * 1253 * \param inode device inode. 1254 * \param file_priv DRM file private. 1255 * \param cmd command. 1256 * \param arg a pointer to a drm_buf_desc structure. 1257 * \return zero on success or a negative number on failure. 1258 * 1259 * Verifies that the size order is bounded between the admissible orders and 1260 * updates the respective drm_device_dma::bufs entry low and high water mark. 1261 * 1262 * \note This ioctl is deprecated and mostly never used. 1263 */ 1264 int drm_markbufs(struct drm_device *dev, void *data, 1265 struct drm_file *file_priv) 1266 { 1267 struct drm_device_dma *dma = dev->dma; 1268 struct drm_buf_desc *request = data; 1269 int order; 1270 struct drm_buf_entry *entry; 1271 1272 if (drm_core_check_feature(dev, DRIVER_MODESET)) 1273 return -EINVAL; 1274 1275 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1276 return -EINVAL; 1277 1278 if (!dma) 1279 return -EINVAL; 1280 1281 DRM_DEBUG("%d, %d, %d\n", 1282 request->size, request->low_mark, request->high_mark); 1283 order = order_base_2(request->size); 1284 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 1285 return -EINVAL; 1286 entry = &dma->bufs[order]; 1287 1288 if (request->low_mark < 0 || request->low_mark > entry->buf_count) 1289 return -EINVAL; 1290 if (request->high_mark < 0 || request->high_mark > entry->buf_count) 1291 return -EINVAL; 1292 1293 entry->freelist.low_mark = request->low_mark; 1294 entry->freelist.high_mark = request->high_mark; 1295 1296 return 0; 1297 } 1298 1299 /** 1300 * Unreserve the buffers in list, previously reserved using drmDMA. 1301 * 1302 * \param inode device inode. 1303 * \param file_priv DRM file private. 1304 * \param cmd command. 1305 * \param arg pointer to a drm_buf_free structure. 1306 * \return zero on success or a negative number on failure. 1307 * 1308 * Calls free_buffer() for each used buffer. 1309 * This function is primarily used for debugging. 1310 */ 1311 int drm_freebufs(struct drm_device *dev, void *data, 1312 struct drm_file *file_priv) 1313 { 1314 struct drm_device_dma *dma = dev->dma; 1315 struct drm_buf_free *request = data; 1316 int i; 1317 int idx; 1318 struct drm_buf *buf; 1319 1320 if (drm_core_check_feature(dev, DRIVER_MODESET)) 1321 return -EINVAL; 1322 1323 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1324 return -EINVAL; 1325 1326 if (!dma) 1327 return -EINVAL; 1328 1329 DRM_DEBUG("%d\n", request->count); 1330 for (i = 0; i < request->count; i++) { 1331 if (copy_from_user(&idx, &request->list[i], sizeof(idx))) 1332 return -EFAULT; 1333 if (idx < 0 || idx >= dma->buf_count) { 1334 DRM_ERROR("Index %d (of %d max)\n", 1335 idx, dma->buf_count - 1); 1336 return -EINVAL; 1337 } 1338 buf = dma->buflist[idx]; 1339 if (buf->file_priv != file_priv) { 1340 DRM_ERROR("Process %d freeing buffer not owned\n", 1341 task_pid_nr(current)); 1342 return -EINVAL; 1343 } 1344 drm_free_buffer(dev, buf); 1345 } 1346 1347 return 0; 1348 } 1349 1350 /** 1351 * Maps all of the DMA buffers into client-virtual space (ioctl). 1352 * 1353 * \param inode device inode. 1354 * \param file_priv DRM file private. 1355 * \param cmd command. 1356 * \param arg pointer to a drm_buf_map structure. 1357 * \return zero on success or a negative number on failure. 1358 * 1359 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information 1360 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with 1361 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls 1362 * drm_mmap_dma(). 1363 */ 1364 int drm_mapbufs(struct drm_device *dev, void *data, 1365 struct drm_file *file_priv) 1366 { 1367 struct drm_device_dma *dma = dev->dma; 1368 int retcode = 0; 1369 const int zero = 0; 1370 unsigned long virtual; 1371 unsigned long address; 1372 struct drm_buf_map *request = data; 1373 int i; 1374 1375 if (drm_core_check_feature(dev, DRIVER_MODESET)) 1376 return -EINVAL; 1377 1378 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1379 return -EINVAL; 1380 1381 if (!dma) 1382 return -EINVAL; 1383 1384 spin_lock(&dev->buf_lock); 1385 if (atomic_read(&dev->buf_alloc)) { 1386 spin_unlock(&dev->buf_lock); 1387 return -EBUSY; 1388 } 1389 dev->buf_use++; /* Can't allocate more after this call */ 1390 spin_unlock(&dev->buf_lock); 1391 1392 if (request->count >= dma->buf_count) { 1393 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP)) 1394 || (drm_core_check_feature(dev, DRIVER_SG) 1395 && (dma->flags & _DRM_DMA_USE_SG))) { 1396 struct drm_local_map *map = dev->agp_buffer_map; 1397 unsigned long token = dev->agp_buffer_token; 1398 1399 if (!map) { 1400 retcode = -EINVAL; 1401 goto done; 1402 } 1403 virtual = vm_mmap(file_priv->filp, 0, map->size, 1404 PROT_READ | PROT_WRITE, 1405 MAP_SHARED, 1406 token); 1407 } else { 1408 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count, 1409 PROT_READ | PROT_WRITE, 1410 MAP_SHARED, 0); 1411 } 1412 if (virtual > -1024UL) { 1413 /* Real error */ 1414 retcode = (signed long)virtual; 1415 goto done; 1416 } 1417 request->virtual = (void __user *)virtual; 1418 1419 for (i = 0; i < dma->buf_count; i++) { 1420 if (copy_to_user(&request->list[i].idx, 1421 &dma->buflist[i]->idx, 1422 sizeof(request->list[0].idx))) { 1423 retcode = -EFAULT; 1424 goto done; 1425 } 1426 if (copy_to_user(&request->list[i].total, 1427 &dma->buflist[i]->total, 1428 sizeof(request->list[0].total))) { 1429 retcode = -EFAULT; 1430 goto done; 1431 } 1432 if (copy_to_user(&request->list[i].used, 1433 &zero, sizeof(zero))) { 1434 retcode = -EFAULT; 1435 goto done; 1436 } 1437 address = virtual + dma->buflist[i]->offset; /* *** */ 1438 if (copy_to_user(&request->list[i].address, 1439 &address, sizeof(address))) { 1440 retcode = -EFAULT; 1441 goto done; 1442 } 1443 } 1444 } 1445 done: 1446 request->count = dma->buf_count; 1447 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode); 1448 1449 return retcode; 1450 } 1451 1452 int drm_dma_ioctl(struct drm_device *dev, void *data, 1453 struct drm_file *file_priv) 1454 { 1455 if (drm_core_check_feature(dev, DRIVER_MODESET)) 1456 return -EINVAL; 1457 1458 if (dev->driver->dma_ioctl) 1459 return dev->driver->dma_ioctl(dev, data, file_priv); 1460 else 1461 return -EINVAL; 1462 } 1463 1464 struct drm_local_map *drm_getsarea(struct drm_device *dev) 1465 { 1466 struct drm_map_list *entry; 1467 1468 list_for_each_entry(entry, &dev->maplist, head) { 1469 if (entry->map && entry->map->type == _DRM_SHM && 1470 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 1471 return entry->map; 1472 } 1473 } 1474 return NULL; 1475 } 1476 EXPORT_SYMBOL(drm_getsarea); 1477