Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/drm_bufs.c
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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 <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/shm.h> 41 42 #include <dev/pci/pcireg.h> 43 44 #include <dev/drm2/drmP.h> 45 46 /* Allocation of PCI memory resources (framebuffer, registers, etc.) for 47 * drm_get_resource_*. Note that they are not RF_ACTIVE, so there's no virtual 48 * address for accessing them. Cleaned up at unload. 49 */ 50 static int drm_alloc_resource(struct drm_device *dev, int resource) 51 { 52 struct resource *res; 53 int rid; 54 55 if (resource >= DRM_MAX_PCI_RESOURCE) { 56 DRM_ERROR("Resource %d too large\n", resource); 57 return 1; 58 } 59 60 if (dev->pcir[resource] != NULL) { 61 return 0; 62 } 63 64 rid = PCIR_BAR(resource); 65 res = bus_alloc_resource_any(dev->dev, SYS_RES_MEMORY, &rid, 66 RF_SHAREABLE); 67 if (res == NULL) { 68 DRM_ERROR("Couldn't find resource 0x%x\n", resource); 69 return 1; 70 } 71 72 if (dev->pcir[resource] == NULL) { 73 dev->pcirid[resource] = rid; 74 dev->pcir[resource] = res; 75 } 76 77 return 0; 78 } 79 80 unsigned long drm_get_resource_start(struct drm_device *dev, 81 unsigned int resource) 82 { 83 unsigned long start; 84 85 mtx_lock(&dev->pcir_lock); 86 87 if (drm_alloc_resource(dev, resource) != 0) 88 return 0; 89 90 start = rman_get_start(dev->pcir[resource]); 91 92 mtx_unlock(&dev->pcir_lock); 93 94 return (start); 95 } 96 97 unsigned long drm_get_resource_len(struct drm_device *dev, 98 unsigned int resource) 99 { 100 unsigned long len; 101 102 mtx_lock(&dev->pcir_lock); 103 104 if (drm_alloc_resource(dev, resource) != 0) 105 return 0; 106 107 len = rman_get_size(dev->pcir[resource]); 108 109 mtx_unlock(&dev->pcir_lock); 110 111 return (len); 112 } 113 114 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev, 115 struct drm_local_map *map) 116 { 117 struct drm_map_list *entry; 118 list_for_each_entry(entry, &dev->maplist, head) { 119 /* 120 * Because the kernel-userspace ABI is fixed at a 32-bit offset 121 * while PCI resources may live above that, we only compare the 122 * lower 32 bits of the map offset for maps of type 123 * _DRM_FRAMEBUFFER or _DRM_REGISTERS. 124 * It is assumed that if a driver have more than one resource 125 * of each type, the lower 32 bits are different. 126 */ 127 if (!entry->map || 128 map->type != entry->map->type || 129 entry->master != dev->primary->master) 130 continue; 131 switch (map->type) { 132 case _DRM_SHM: 133 if (map->flags != _DRM_CONTAINS_LOCK) 134 break; 135 return entry; 136 case _DRM_REGISTERS: 137 case _DRM_FRAME_BUFFER: 138 if ((entry->map->offset & 0xffffffff) == 139 (map->offset & 0xffffffff)) 140 return entry; 141 default: /* Make gcc happy */ 142 ; 143 } 144 if (entry->map->offset == map->offset) 145 return entry; 146 } 147 148 return NULL; 149 } 150 151 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash, 152 unsigned long user_token, int hashed_handle, int shm) 153 { 154 int use_hashed_handle, shift; 155 unsigned long add; 156 157 #if (BITS_PER_LONG == 64) 158 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle); 159 #elif (BITS_PER_LONG == 32) 160 use_hashed_handle = hashed_handle; 161 #else 162 #error Unsupported long size. Neither 64 nor 32 bits. 163 #endif 164 165 if (!use_hashed_handle) { 166 int ret; 167 hash->key = user_token >> PAGE_SHIFT; 168 ret = drm_ht_insert_item(&dev->map_hash, hash); 169 if (ret != -EINVAL) 170 return ret; 171 } 172 173 shift = 0; 174 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT; 175 if (shm && (SHMLBA > PAGE_SIZE)) { 176 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1; 177 178 /* For shared memory, we have to preserve the SHMLBA 179 * bits of the eventual vma->vm_pgoff value during 180 * mmap(). Otherwise we run into cache aliasing problems 181 * on some platforms. On these platforms, the pgoff of 182 * a mmap() request is used to pick a suitable virtual 183 * address for the mmap() region such that it will not 184 * cause cache aliasing problems. 185 * 186 * Therefore, make sure the SHMLBA relevant bits of the 187 * hash value we use are equal to those in the original 188 * kernel virtual address. 189 */ 190 shift = bits; 191 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL)); 192 } 193 194 return drm_ht_just_insert_please(&dev->map_hash, hash, 195 user_token, 32 - PAGE_SHIFT - 3, 196 shift, add); 197 } 198 199 /** 200 * Core function to create a range of memory available for mapping by a 201 * non-root process. 202 * 203 * Adjusts the memory offset to its absolute value according to the mapping 204 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where 205 * applicable and if supported by the kernel. 206 */ 207 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset, 208 unsigned int size, enum drm_map_type type, 209 enum drm_map_flags flags, 210 struct drm_map_list ** maplist) 211 { 212 struct drm_local_map *map; 213 struct drm_map_list *list; 214 drm_dma_handle_t *dmah; 215 unsigned long user_token; 216 int ret; 217 int align; 218 219 map = malloc(sizeof(*map), DRM_MEM_MAPS, M_NOWAIT); 220 if (!map) 221 return -ENOMEM; 222 223 map->offset = offset; 224 map->size = size; 225 map->flags = flags; 226 map->type = type; 227 228 /* Only allow shared memory to be removable since we only keep enough 229 * book keeping information about shared memory to allow for removal 230 * when processes fork. 231 */ 232 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) { 233 free(map, DRM_MEM_MAPS); 234 return -EINVAL; 235 } 236 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n", 237 (unsigned long long)map->offset, map->size, map->type); 238 239 /* page-align _DRM_SHM maps. They are allocated here so there is no security 240 * hole created by that and it works around various broken drivers that use 241 * a non-aligned quantity to map the SAREA. --BenH 242 */ 243 if (map->type == _DRM_SHM) 244 map->size = PAGE_ALIGN(map->size); 245 246 /* 247 * FreeBSD port note: FreeBSD's PAGE_MASK is the inverse of 248 * Linux's one. That's why the test below doesn't inverse the 249 * constant. 250 */ 251 if ((map->offset & ((resource_size_t)PAGE_MASK)) || (map->size & (PAGE_MASK))) { 252 free(map, DRM_MEM_MAPS); 253 return -EINVAL; 254 } 255 map->mtrr = -1; 256 map->handle = NULL; 257 258 switch (map->type) { 259 case _DRM_REGISTERS: 260 case _DRM_FRAME_BUFFER: 261 #ifdef __linux__ 262 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__) 263 if (map->offset + (map->size-1) < map->offset || 264 map->offset < virt_to_phys(high_memory)) { 265 kfree(map); 266 return -EINVAL; 267 } 268 #endif 269 #endif 270 /* Some drivers preinitialize some maps, without the X Server 271 * needing to be aware of it. Therefore, we just return success 272 * when the server tries to create a duplicate map. 273 */ 274 list = drm_find_matching_map(dev, map); 275 if (list != NULL) { 276 if (list->map->size != map->size) { 277 DRM_DEBUG("Matching maps of type %d with " 278 "mismatched sizes, (%ld vs %ld)\n", 279 map->type, map->size, 280 list->map->size); 281 list->map->size = map->size; 282 } 283 284 free(map, DRM_MEM_MAPS); 285 *maplist = list; 286 return 0; 287 } 288 289 if (drm_core_has_MTRR(dev)) { 290 if (map->type == _DRM_FRAME_BUFFER || 291 (map->flags & _DRM_WRITE_COMBINING)) { 292 if (drm_mtrr_add( 293 map->offset, map->size, 294 DRM_MTRR_WC) == 0) 295 map->mtrr = 1; 296 } 297 } 298 if (map->type == _DRM_REGISTERS) { 299 drm_core_ioremap(map, dev); 300 if (!map->handle) { 301 free(map, DRM_MEM_MAPS); 302 return -ENOMEM; 303 } 304 } 305 306 break; 307 case _DRM_SHM: 308 list = drm_find_matching_map(dev, map); 309 if (list != NULL) { 310 if(list->map->size != map->size) { 311 DRM_DEBUG("Matching maps of type %d with " 312 "mismatched sizes, (%ld vs %ld)\n", 313 map->type, map->size, list->map->size); 314 list->map->size = map->size; 315 } 316 317 free(map, DRM_MEM_MAPS); 318 *maplist = list; 319 return 0; 320 } 321 map->handle = malloc(map->size, DRM_MEM_MAPS, M_NOWAIT); 322 DRM_DEBUG("%lu %d %p\n", 323 map->size, drm_order(map->size), map->handle); 324 if (!map->handle) { 325 free(map, DRM_MEM_MAPS); 326 return -ENOMEM; 327 } 328 map->offset = (unsigned long)map->handle; 329 if (map->flags & _DRM_CONTAINS_LOCK) { 330 /* Prevent a 2nd X Server from creating a 2nd lock */ 331 if (dev->primary->master->lock.hw_lock != NULL) { 332 free(map->handle, DRM_MEM_MAPS); 333 free(map, DRM_MEM_MAPS); 334 return -EBUSY; 335 } 336 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */ 337 } 338 break; 339 case _DRM_AGP: { 340 struct drm_agp_mem *entry; 341 int valid = 0; 342 343 if (!drm_core_has_AGP(dev)) { 344 free(map, DRM_MEM_MAPS); 345 return -EINVAL; 346 } 347 #ifdef __linux__ 348 #ifdef __alpha__ 349 map->offset += dev->hose->mem_space->start; 350 #endif 351 #endif 352 /* In some cases (i810 driver), user space may have already 353 * added the AGP base itself, because dev->agp->base previously 354 * only got set during AGP enable. So, only add the base 355 * address if the map's offset isn't already within the 356 * aperture. 357 */ 358 if (map->offset < dev->agp->base || 359 map->offset > dev->agp->base + 360 dev->agp->agp_info.ai_aperture_size * 1024 * 1024 - 1) { 361 map->offset += dev->agp->base; 362 } 363 map->mtrr = dev->agp->agp_mtrr; /* for getmap */ 364 365 /* This assumes the DRM is in total control of AGP space. 366 * It's not always the case as AGP can be in the control 367 * of user space (i.e. i810 driver). So this loop will get 368 * skipped and we double check that dev->agp->memory is 369 * actually set as well as being invalid before EPERM'ing 370 */ 371 list_for_each_entry(entry, &dev->agp->memory, head) { 372 if ((map->offset >= entry->bound) && 373 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) { 374 valid = 1; 375 break; 376 } 377 } 378 if (!list_empty(&dev->agp->memory) && !valid) { 379 free(map, DRM_MEM_MAPS); 380 return -EPERM; 381 } 382 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n", 383 (unsigned long long)map->offset, map->size); 384 385 break; 386 } 387 case _DRM_GEM: 388 DRM_ERROR("tried to addmap GEM object\n"); 389 break; 390 case _DRM_SCATTER_GATHER: 391 if (!dev->sg) { 392 free(map, DRM_MEM_MAPS); 393 return -EINVAL; 394 } 395 map->handle = (void *)(dev->sg->vaddr + offset); 396 map->offset += dev->sg->vaddr; 397 break; 398 case _DRM_CONSISTENT: 399 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G, 400 * As we're limiting the address to 2^32-1 (or less), 401 * casting it down to 32 bits is no problem, but we 402 * need to point to a 64bit variable first. */ 403 align = map->size; 404 if ((align & (align - 1)) != 0) 405 align = PAGE_SIZE; 406 dmah = drm_pci_alloc(dev, map->size, align, BUS_SPACE_MAXADDR); 407 if (!dmah) { 408 free(map, DRM_MEM_MAPS); 409 return -ENOMEM; 410 } 411 map->handle = dmah->vaddr; 412 map->offset = dmah->busaddr; 413 map->dmah = dmah; 414 break; 415 default: 416 free(map, DRM_MEM_MAPS); 417 return -EINVAL; 418 } 419 420 list = malloc(sizeof(*list), DRM_MEM_MAPS, M_ZERO | M_NOWAIT); 421 if (!list) { 422 if (map->type == _DRM_REGISTERS) 423 drm_core_ioremapfree(map, dev); 424 free(map, DRM_MEM_MAPS); 425 return -EINVAL; 426 } 427 list->map = map; 428 429 DRM_LOCK(dev); 430 list_add(&list->head, &dev->maplist); 431 432 /* Assign a 32-bit handle */ 433 /* We do it here so that dev->struct_mutex protects the increment */ 434 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle : 435 map->offset; 436 ret = drm_map_handle(dev, &list->hash, user_token, 0, 437 (map->type == _DRM_SHM)); 438 if (ret) { 439 if (map->type == _DRM_REGISTERS) 440 drm_core_ioremapfree(map, dev); 441 free(map, DRM_MEM_MAPS); 442 free(list, DRM_MEM_MAPS); 443 DRM_UNLOCK(dev); 444 return ret; 445 } 446 447 list->user_token = list->hash.key << PAGE_SHIFT; 448 DRM_UNLOCK(dev); 449 450 if (!(map->flags & _DRM_DRIVER)) 451 list->master = dev->primary->master; 452 *maplist = list; 453 return 0; 454 } 455 456 int drm_addmap(struct drm_device * dev, resource_size_t offset, 457 unsigned int size, enum drm_map_type type, 458 enum drm_map_flags flags, struct drm_local_map ** map_ptr) 459 { 460 struct drm_map_list *list; 461 int rc; 462 463 rc = drm_addmap_core(dev, offset, size, type, flags, &list); 464 if (!rc) 465 *map_ptr = list->map; 466 return rc; 467 } 468 469 EXPORT_SYMBOL(drm_addmap); 470 471 /** 472 * Ioctl to specify a range of memory that is available for mapping by a 473 * non-root process. 474 * 475 * \param inode device inode. 476 * \param file_priv DRM file private. 477 * \param cmd command. 478 * \param arg pointer to a drm_map structure. 479 * \return zero on success or a negative value on error. 480 * 481 */ 482 int drm_addmap_ioctl(struct drm_device *dev, void *data, 483 struct drm_file *file_priv) 484 { 485 struct drm_map *map = data; 486 struct drm_map_list *maplist; 487 int err; 488 489 if (!(DRM_SUSER(DRM_CURPROC) || map->type == _DRM_AGP || map->type == _DRM_SHM)) 490 return -EPERM; 491 492 err = drm_addmap_core(dev, map->offset, map->size, map->type, 493 map->flags, &maplist); 494 495 if (err) 496 return err; 497 498 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */ 499 map->handle = (void *)(unsigned long)maplist->user_token; 500 return 0; 501 } 502 503 /** 504 * Remove a map private from list and deallocate resources if the mapping 505 * isn't in use. 506 * 507 * Searches the map on drm_device::maplist, removes it from the list, see if 508 * its being used, and free any associate resource (such as MTRR's) if it's not 509 * being on use. 510 * 511 * \sa drm_addmap 512 */ 513 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map) 514 { 515 struct drm_map_list *r_list = NULL, *list_t; 516 int found = 0; 517 struct drm_master *master; 518 519 /* Find the list entry for the map and remove it */ 520 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) { 521 if (r_list->map == map) { 522 master = r_list->master; 523 list_del(&r_list->head); 524 drm_ht_remove_key(&dev->map_hash, 525 r_list->user_token >> PAGE_SHIFT); 526 free(r_list, DRM_MEM_MAPS); 527 found = 1; 528 break; 529 } 530 } 531 532 if (!found) 533 return -EINVAL; 534 535 switch (map->type) { 536 case _DRM_REGISTERS: 537 drm_core_ioremapfree(map, dev); 538 /* FALLTHROUGH */ 539 case _DRM_FRAME_BUFFER: 540 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { 541 int retcode; 542 retcode = drm_mtrr_del(map->mtrr, map->offset, 543 map->size, DRM_MTRR_WC); 544 DRM_DEBUG("mtrr_del=%d\n", retcode); 545 } 546 break; 547 case _DRM_SHM: 548 free(map->handle, DRM_MEM_MAPS); 549 if (master) { 550 if (dev->sigdata.lock == master->lock.hw_lock) 551 dev->sigdata.lock = NULL; 552 master->lock.hw_lock = NULL; /* SHM removed */ 553 master->lock.file_priv = NULL; 554 DRM_WAKEUP_INT((void *)&master->lock.lock_queue); 555 } 556 break; 557 case _DRM_AGP: 558 case _DRM_SCATTER_GATHER: 559 break; 560 case _DRM_CONSISTENT: 561 drm_pci_free(dev, map->dmah); 562 break; 563 case _DRM_GEM: 564 DRM_ERROR("tried to rmmap GEM object\n"); 565 break; 566 } 567 free(map, DRM_MEM_MAPS); 568 569 return 0; 570 } 571 EXPORT_SYMBOL(drm_rmmap_locked); 572 573 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map) 574 { 575 int ret; 576 577 DRM_LOCK(dev); 578 ret = drm_rmmap_locked(dev, map); 579 DRM_UNLOCK(dev); 580 581 return ret; 582 } 583 EXPORT_SYMBOL(drm_rmmap); 584 585 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on 586 * the last close of the device, and this is necessary for cleanup when things 587 * exit uncleanly. Therefore, having userland manually remove mappings seems 588 * like a pointless exercise since they're going away anyway. 589 * 590 * One use case might be after addmap is allowed for normal users for SHM and 591 * gets used by drivers that the server doesn't need to care about. This seems 592 * unlikely. 593 * 594 * \param inode device inode. 595 * \param file_priv DRM file private. 596 * \param cmd command. 597 * \param arg pointer to a struct drm_map structure. 598 * \return zero on success or a negative value on error. 599 */ 600 int drm_rmmap_ioctl(struct drm_device *dev, void *data, 601 struct drm_file *file_priv) 602 { 603 struct drm_map *request = data; 604 struct drm_local_map *map = NULL; 605 struct drm_map_list *r_list; 606 int ret; 607 608 DRM_LOCK(dev); 609 list_for_each_entry(r_list, &dev->maplist, head) { 610 if (r_list->map && 611 r_list->user_token == (unsigned long)request->handle && 612 r_list->map->flags & _DRM_REMOVABLE) { 613 map = r_list->map; 614 break; 615 } 616 } 617 618 /* List has wrapped around to the head pointer, or its empty we didn't 619 * find anything. 620 */ 621 if (list_empty(&dev->maplist) || !map) { 622 DRM_UNLOCK(dev); 623 return -EINVAL; 624 } 625 626 /* Register and framebuffer maps are permanent */ 627 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) { 628 DRM_UNLOCK(dev); 629 return 0; 630 } 631 632 ret = drm_rmmap_locked(dev, map); 633 634 DRM_UNLOCK(dev); 635 636 return ret; 637 } 638 639 /** 640 * Cleanup after an error on one of the addbufs() functions. 641 * 642 * \param dev DRM device. 643 * \param entry buffer entry where the error occurred. 644 * 645 * Frees any pages and buffers associated with the given entry. 646 */ 647 static void drm_cleanup_buf_error(struct drm_device * dev, 648 struct drm_buf_entry * entry) 649 { 650 int i; 651 652 if (entry->seg_count) { 653 for (i = 0; i < entry->seg_count; i++) { 654 if (entry->seglist[i]) { 655 drm_pci_free(dev, entry->seglist[i]); 656 } 657 } 658 free(entry->seglist, DRM_MEM_SEGS); 659 660 entry->seg_count = 0; 661 } 662 663 if (entry->buf_count) { 664 for (i = 0; i < entry->buf_count; i++) { 665 free(entry->buflist[i].dev_private, DRM_MEM_BUFS); 666 } 667 free(entry->buflist, DRM_MEM_BUFS); 668 669 entry->buf_count = 0; 670 } 671 } 672 673 #if __OS_HAS_AGP 674 /** 675 * Add AGP buffers for DMA transfers. 676 * 677 * \param dev struct drm_device to which the buffers are to be added. 678 * \param request pointer to a struct drm_buf_desc describing the request. 679 * \return zero on success or a negative number on failure. 680 * 681 * After some sanity checks creates a drm_buf structure for each buffer and 682 * reallocates the buffer list of the same size order to accommodate the new 683 * buffers. 684 */ 685 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request) 686 { 687 struct drm_device_dma *dma = dev->dma; 688 struct drm_buf_entry *entry; 689 struct drm_agp_mem *agp_entry; 690 struct drm_buf *buf; 691 unsigned long offset; 692 unsigned long agp_offset; 693 int count; 694 int order; 695 int size; 696 int alignment; 697 int page_order; 698 int total; 699 int byte_count; 700 int i, valid; 701 struct drm_buf **temp_buflist; 702 703 if (!dma) 704 return -EINVAL; 705 706 count = request->count; 707 order = drm_order(request->size); 708 size = 1 << order; 709 710 alignment = (request->flags & _DRM_PAGE_ALIGN) 711 ? PAGE_ALIGN(size) : size; 712 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 713 total = PAGE_SIZE << page_order; 714 715 byte_count = 0; 716 agp_offset = dev->agp->base + request->agp_start; 717 718 DRM_DEBUG("count: %d\n", count); 719 DRM_DEBUG("order: %d\n", order); 720 DRM_DEBUG("size: %d\n", size); 721 DRM_DEBUG("agp_offset: %lx\n", agp_offset); 722 DRM_DEBUG("alignment: %d\n", alignment); 723 DRM_DEBUG("page_order: %d\n", page_order); 724 DRM_DEBUG("total: %d\n", total); 725 726 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 727 return -EINVAL; 728 729 /* Make sure buffers are located in AGP memory that we own */ 730 valid = 0; 731 list_for_each_entry(agp_entry, &dev->agp->memory, head) { 732 if ((agp_offset >= agp_entry->bound) && 733 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) { 734 valid = 1; 735 break; 736 } 737 } 738 if (!list_empty(&dev->agp->memory) && !valid) { 739 DRM_DEBUG("zone invalid\n"); 740 return -EINVAL; 741 } 742 mtx_lock(&dev->count_lock); 743 if (dev->buf_use) { 744 mtx_unlock(&dev->count_lock); 745 return -EBUSY; 746 } 747 atomic_inc(&dev->buf_alloc); 748 mtx_unlock(&dev->count_lock); 749 750 DRM_LOCK(dev); 751 entry = &dma->bufs[order]; 752 if (entry->buf_count) { 753 DRM_UNLOCK(dev); 754 atomic_dec(&dev->buf_alloc); 755 return -ENOMEM; /* May only call once for each order */ 756 } 757 758 if (count < 0 || count > 4096) { 759 DRM_UNLOCK(dev); 760 atomic_dec(&dev->buf_alloc); 761 return -EINVAL; 762 } 763 764 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS, 765 M_NOWAIT | M_ZERO); 766 if (!entry->buflist) { 767 DRM_UNLOCK(dev); 768 atomic_dec(&dev->buf_alloc); 769 return -ENOMEM; 770 } 771 772 entry->buf_size = size; 773 entry->page_order = page_order; 774 775 offset = 0; 776 777 while (entry->buf_count < count) { 778 buf = &entry->buflist[entry->buf_count]; 779 buf->idx = dma->buf_count + entry->buf_count; 780 buf->total = alignment; 781 buf->order = order; 782 buf->used = 0; 783 784 buf->offset = (dma->byte_count + offset); 785 buf->bus_address = agp_offset + offset; 786 buf->address = (void *)(agp_offset + offset); 787 buf->next = NULL; 788 buf->waiting = 0; 789 buf->pending = 0; 790 buf->file_priv = NULL; 791 792 buf->dev_priv_size = dev->driver->dev_priv_size; 793 buf->dev_private = malloc(buf->dev_priv_size, DRM_MEM_BUFS, 794 M_NOWAIT | M_ZERO); 795 if (!buf->dev_private) { 796 /* Set count correctly so we free the proper amount. */ 797 entry->buf_count = count; 798 drm_cleanup_buf_error(dev, entry); 799 DRM_UNLOCK(dev); 800 atomic_dec(&dev->buf_alloc); 801 return -ENOMEM; 802 } 803 804 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); 805 806 offset += alignment; 807 entry->buf_count++; 808 byte_count += PAGE_SIZE << page_order; 809 } 810 811 DRM_DEBUG("byte_count: %d\n", byte_count); 812 813 temp_buflist = realloc(dma->buflist, 814 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), 815 DRM_MEM_BUFS, M_NOWAIT); 816 if (!temp_buflist) { 817 /* Free the entry because it isn't valid */ 818 drm_cleanup_buf_error(dev, entry); 819 DRM_UNLOCK(dev); 820 atomic_dec(&dev->buf_alloc); 821 return -ENOMEM; 822 } 823 dma->buflist = temp_buflist; 824 825 for (i = 0; i < entry->buf_count; i++) { 826 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 827 } 828 829 dma->buf_count += entry->buf_count; 830 dma->seg_count += entry->seg_count; 831 dma->page_count += byte_count >> PAGE_SHIFT; 832 dma->byte_count += byte_count; 833 834 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); 835 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); 836 837 DRM_UNLOCK(dev); 838 839 request->count = entry->buf_count; 840 request->size = size; 841 842 dma->flags = _DRM_DMA_USE_AGP; 843 844 atomic_dec(&dev->buf_alloc); 845 return 0; 846 } 847 EXPORT_SYMBOL(drm_addbufs_agp); 848 #endif /* __OS_HAS_AGP */ 849 850 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request) 851 { 852 struct drm_device_dma *dma = dev->dma; 853 int count; 854 int order; 855 int size; 856 int total; 857 int page_order; 858 struct drm_buf_entry *entry; 859 drm_dma_handle_t *dmah; 860 struct drm_buf *buf; 861 int alignment; 862 unsigned long offset; 863 int i; 864 int byte_count; 865 int page_count; 866 unsigned long *temp_pagelist; 867 struct drm_buf **temp_buflist; 868 869 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA)) 870 return -EINVAL; 871 872 if (!dma) 873 return -EINVAL; 874 875 if (!DRM_SUSER(DRM_CURPROC)) 876 return -EPERM; 877 878 count = request->count; 879 order = drm_order(request->size); 880 size = 1 << order; 881 882 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n", 883 request->count, request->size, size, order); 884 885 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 886 return -EINVAL; 887 888 alignment = (request->flags & _DRM_PAGE_ALIGN) 889 ? PAGE_ALIGN(size) : size; 890 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 891 total = PAGE_SIZE << page_order; 892 893 mtx_lock(&dev->count_lock); 894 if (dev->buf_use) { 895 mtx_unlock(&dev->count_lock); 896 return -EBUSY; 897 } 898 atomic_inc(&dev->buf_alloc); 899 mtx_unlock(&dev->count_lock); 900 901 DRM_LOCK(dev); 902 entry = &dma->bufs[order]; 903 if (entry->buf_count) { 904 DRM_UNLOCK(dev); 905 atomic_dec(&dev->buf_alloc); 906 return -ENOMEM; /* May only call once for each order */ 907 } 908 909 if (count < 0 || count > 4096) { 910 DRM_UNLOCK(dev); 911 atomic_dec(&dev->buf_alloc); 912 return -EINVAL; 913 } 914 915 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS, 916 M_NOWAIT | M_ZERO); 917 if (!entry->buflist) { 918 DRM_UNLOCK(dev); 919 atomic_dec(&dev->buf_alloc); 920 return -ENOMEM; 921 } 922 923 entry->seglist = malloc(count * sizeof(*entry->seglist), DRM_MEM_SEGS, 924 M_NOWAIT | M_ZERO); 925 if (!entry->seglist) { 926 free(entry->buflist, DRM_MEM_BUFS); 927 DRM_UNLOCK(dev); 928 atomic_dec(&dev->buf_alloc); 929 return -ENOMEM; 930 } 931 932 /* Keep the original pagelist until we know all the allocations 933 * have succeeded 934 */ 935 temp_pagelist = malloc((dma->page_count + (count << page_order)) * 936 sizeof(*dma->pagelist), DRM_MEM_PAGES, M_NOWAIT); 937 if (!temp_pagelist) { 938 free(entry->buflist, DRM_MEM_BUFS); 939 free(entry->seglist, DRM_MEM_SEGS); 940 DRM_UNLOCK(dev); 941 atomic_dec(&dev->buf_alloc); 942 return -ENOMEM; 943 } 944 memcpy(temp_pagelist, 945 dma->pagelist, dma->page_count * sizeof(*dma->pagelist)); 946 DRM_DEBUG("pagelist: %d entries\n", 947 dma->page_count + (count << page_order)); 948 949 entry->buf_size = size; 950 entry->page_order = page_order; 951 byte_count = 0; 952 page_count = 0; 953 954 while (entry->buf_count < count) { 955 956 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, BUS_SPACE_MAXADDR); 957 958 if (!dmah) { 959 /* Set count correctly so we free the proper amount. */ 960 entry->buf_count = count; 961 entry->seg_count = count; 962 drm_cleanup_buf_error(dev, entry); 963 free(temp_pagelist, DRM_MEM_PAGES); 964 DRM_UNLOCK(dev); 965 atomic_dec(&dev->buf_alloc); 966 return -ENOMEM; 967 } 968 entry->seglist[entry->seg_count++] = dmah; 969 for (i = 0; i < (1 << page_order); i++) { 970 DRM_DEBUG("page %d @ 0x%08lx\n", 971 dma->page_count + page_count, 972 (unsigned long)dmah->vaddr + PAGE_SIZE * i); 973 temp_pagelist[dma->page_count + page_count++] 974 = (unsigned long)dmah->vaddr + PAGE_SIZE * i; 975 } 976 for (offset = 0; 977 offset + size <= total && entry->buf_count < count; 978 offset += alignment, ++entry->buf_count) { 979 buf = &entry->buflist[entry->buf_count]; 980 buf->idx = dma->buf_count + entry->buf_count; 981 buf->total = alignment; 982 buf->order = order; 983 buf->used = 0; 984 buf->offset = (dma->byte_count + byte_count + offset); 985 buf->address = (void *)((char *)dmah->vaddr + offset); 986 buf->bus_address = dmah->busaddr + offset; 987 buf->next = NULL; 988 buf->waiting = 0; 989 buf->pending = 0; 990 buf->file_priv = NULL; 991 992 buf->dev_priv_size = dev->driver->dev_priv_size; 993 buf->dev_private = malloc(buf->dev_priv_size, 994 DRM_MEM_BUFS, M_NOWAIT | M_ZERO); 995 if (!buf->dev_private) { 996 /* Set count correctly so we free the proper amount. */ 997 entry->buf_count = count; 998 entry->seg_count = count; 999 drm_cleanup_buf_error(dev, entry); 1000 free(temp_pagelist, DRM_MEM_PAGES); 1001 DRM_UNLOCK(dev); 1002 atomic_dec(&dev->buf_alloc); 1003 return -ENOMEM; 1004 } 1005 1006 DRM_DEBUG("buffer %d @ %p\n", 1007 entry->buf_count, buf->address); 1008 } 1009 byte_count += PAGE_SIZE << page_order; 1010 } 1011 1012 temp_buflist = realloc(dma->buflist, 1013 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), 1014 DRM_MEM_BUFS, M_NOWAIT); 1015 if (!temp_buflist) { 1016 /* Free the entry because it isn't valid */ 1017 drm_cleanup_buf_error(dev, entry); 1018 free(temp_pagelist, DRM_MEM_PAGES); 1019 DRM_UNLOCK(dev); 1020 atomic_dec(&dev->buf_alloc); 1021 return -ENOMEM; 1022 } 1023 dma->buflist = temp_buflist; 1024 1025 for (i = 0; i < entry->buf_count; i++) { 1026 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 1027 } 1028 1029 /* No allocations failed, so now we can replace the original pagelist 1030 * with the new one. 1031 */ 1032 if (dma->page_count) { 1033 free(dma->pagelist, DRM_MEM_PAGES); 1034 } 1035 dma->pagelist = temp_pagelist; 1036 1037 dma->buf_count += entry->buf_count; 1038 dma->seg_count += entry->seg_count; 1039 dma->page_count += entry->seg_count << page_order; 1040 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order); 1041 1042 DRM_UNLOCK(dev); 1043 1044 request->count = entry->buf_count; 1045 request->size = size; 1046 1047 if (request->flags & _DRM_PCI_BUFFER_RO) 1048 dma->flags = _DRM_DMA_USE_PCI_RO; 1049 1050 atomic_dec(&dev->buf_alloc); 1051 return 0; 1052 1053 } 1054 EXPORT_SYMBOL(drm_addbufs_pci); 1055 1056 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request) 1057 { 1058 struct drm_device_dma *dma = dev->dma; 1059 struct drm_buf_entry *entry; 1060 struct drm_buf *buf; 1061 unsigned long offset; 1062 unsigned long agp_offset; 1063 int count; 1064 int order; 1065 int size; 1066 int alignment; 1067 int page_order; 1068 int total; 1069 int byte_count; 1070 int i; 1071 struct drm_buf **temp_buflist; 1072 1073 if (!drm_core_check_feature(dev, DRIVER_SG)) 1074 return -EINVAL; 1075 1076 if (!dma) 1077 return -EINVAL; 1078 1079 if (!DRM_SUSER(DRM_CURPROC)) 1080 return -EPERM; 1081 1082 count = request->count; 1083 order = drm_order(request->size); 1084 size = 1 << order; 1085 1086 alignment = (request->flags & _DRM_PAGE_ALIGN) 1087 ? PAGE_ALIGN(size) : size; 1088 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 1089 total = PAGE_SIZE << page_order; 1090 1091 byte_count = 0; 1092 agp_offset = request->agp_start; 1093 1094 DRM_DEBUG("count: %d\n", count); 1095 DRM_DEBUG("order: %d\n", order); 1096 DRM_DEBUG("size: %d\n", size); 1097 DRM_DEBUG("agp_offset: %lu\n", agp_offset); 1098 DRM_DEBUG("alignment: %d\n", alignment); 1099 DRM_DEBUG("page_order: %d\n", page_order); 1100 DRM_DEBUG("total: %d\n", total); 1101 1102 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 1103 return -EINVAL; 1104 1105 mtx_lock(&dev->count_lock); 1106 if (dev->buf_use) { 1107 mtx_unlock(&dev->count_lock); 1108 return -EBUSY; 1109 } 1110 atomic_inc(&dev->buf_alloc); 1111 mtx_unlock(&dev->count_lock); 1112 1113 DRM_LOCK(dev); 1114 entry = &dma->bufs[order]; 1115 if (entry->buf_count) { 1116 DRM_UNLOCK(dev); 1117 atomic_dec(&dev->buf_alloc); 1118 return -ENOMEM; /* May only call once for each order */ 1119 } 1120 1121 if (count < 0 || count > 4096) { 1122 DRM_UNLOCK(dev); 1123 atomic_dec(&dev->buf_alloc); 1124 return -EINVAL; 1125 } 1126 1127 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS, 1128 M_NOWAIT | M_ZERO); 1129 if (!entry->buflist) { 1130 DRM_UNLOCK(dev); 1131 atomic_dec(&dev->buf_alloc); 1132 return -ENOMEM; 1133 } 1134 1135 entry->buf_size = size; 1136 entry->page_order = page_order; 1137 1138 offset = 0; 1139 1140 while (entry->buf_count < count) { 1141 buf = &entry->buflist[entry->buf_count]; 1142 buf->idx = dma->buf_count + entry->buf_count; 1143 buf->total = alignment; 1144 buf->order = order; 1145 buf->used = 0; 1146 1147 buf->offset = (dma->byte_count + offset); 1148 buf->bus_address = agp_offset + offset; 1149 buf->address = (void *)(agp_offset + offset 1150 + (unsigned long)dev->sg->vaddr); 1151 buf->next = NULL; 1152 buf->waiting = 0; 1153 buf->pending = 0; 1154 buf->file_priv = NULL; 1155 1156 buf->dev_priv_size = dev->driver->dev_priv_size; 1157 buf->dev_private = malloc(buf->dev_priv_size, DRM_MEM_BUFS, 1158 M_NOWAIT | M_ZERO); 1159 if (!buf->dev_private) { 1160 /* Set count correctly so we free the proper amount. */ 1161 entry->buf_count = count; 1162 drm_cleanup_buf_error(dev, entry); 1163 DRM_UNLOCK(dev); 1164 atomic_dec(&dev->buf_alloc); 1165 return -ENOMEM; 1166 } 1167 1168 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); 1169 1170 offset += alignment; 1171 entry->buf_count++; 1172 byte_count += PAGE_SIZE << page_order; 1173 } 1174 1175 DRM_DEBUG("byte_count: %d\n", byte_count); 1176 1177 temp_buflist = realloc(dma->buflist, 1178 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), 1179 DRM_MEM_BUFS, M_NOWAIT); 1180 if (!temp_buflist) { 1181 /* Free the entry because it isn't valid */ 1182 drm_cleanup_buf_error(dev, entry); 1183 DRM_UNLOCK(dev); 1184 atomic_dec(&dev->buf_alloc); 1185 return -ENOMEM; 1186 } 1187 dma->buflist = temp_buflist; 1188 1189 for (i = 0; i < entry->buf_count; i++) { 1190 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 1191 } 1192 1193 dma->buf_count += entry->buf_count; 1194 dma->seg_count += entry->seg_count; 1195 dma->page_count += byte_count >> PAGE_SHIFT; 1196 dma->byte_count += byte_count; 1197 1198 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); 1199 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); 1200 1201 DRM_UNLOCK(dev); 1202 1203 request->count = entry->buf_count; 1204 request->size = size; 1205 1206 dma->flags = _DRM_DMA_USE_SG; 1207 1208 atomic_dec(&dev->buf_alloc); 1209 return 0; 1210 } 1211 1212 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request) 1213 { 1214 struct drm_device_dma *dma = dev->dma; 1215 struct drm_buf_entry *entry; 1216 struct drm_buf *buf; 1217 unsigned long offset; 1218 unsigned long agp_offset; 1219 int count; 1220 int order; 1221 int size; 1222 int alignment; 1223 int page_order; 1224 int total; 1225 int byte_count; 1226 int i; 1227 struct drm_buf **temp_buflist; 1228 1229 if (!drm_core_check_feature(dev, DRIVER_FB_DMA)) 1230 return -EINVAL; 1231 1232 if (!dma) 1233 return -EINVAL; 1234 1235 if (!DRM_SUSER(DRM_CURPROC)) 1236 return -EPERM; 1237 1238 count = request->count; 1239 order = drm_order(request->size); 1240 size = 1 << order; 1241 1242 alignment = (request->flags & _DRM_PAGE_ALIGN) 1243 ? PAGE_ALIGN(size) : size; 1244 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; 1245 total = PAGE_SIZE << page_order; 1246 1247 byte_count = 0; 1248 agp_offset = request->agp_start; 1249 1250 DRM_DEBUG("count: %d\n", count); 1251 DRM_DEBUG("order: %d\n", order); 1252 DRM_DEBUG("size: %d\n", size); 1253 DRM_DEBUG("agp_offset: %lu\n", agp_offset); 1254 DRM_DEBUG("alignment: %d\n", alignment); 1255 DRM_DEBUG("page_order: %d\n", page_order); 1256 DRM_DEBUG("total: %d\n", total); 1257 1258 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 1259 return -EINVAL; 1260 1261 mtx_lock(&dev->count_lock); 1262 if (dev->buf_use) { 1263 mtx_unlock(&dev->count_lock); 1264 return -EBUSY; 1265 } 1266 atomic_inc(&dev->buf_alloc); 1267 mtx_unlock(&dev->count_lock); 1268 1269 DRM_LOCK(dev); 1270 entry = &dma->bufs[order]; 1271 if (entry->buf_count) { 1272 DRM_UNLOCK(dev); 1273 atomic_dec(&dev->buf_alloc); 1274 return -ENOMEM; /* May only call once for each order */ 1275 } 1276 1277 if (count < 0 || count > 4096) { 1278 DRM_UNLOCK(dev); 1279 atomic_dec(&dev->buf_alloc); 1280 return -EINVAL; 1281 } 1282 1283 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS, 1284 M_NOWAIT | M_ZERO); 1285 if (!entry->buflist) { 1286 DRM_UNLOCK(dev); 1287 atomic_dec(&dev->buf_alloc); 1288 return -ENOMEM; 1289 } 1290 1291 entry->buf_size = size; 1292 entry->page_order = page_order; 1293 1294 offset = 0; 1295 1296 while (entry->buf_count < count) { 1297 buf = &entry->buflist[entry->buf_count]; 1298 buf->idx = dma->buf_count + entry->buf_count; 1299 buf->total = alignment; 1300 buf->order = order; 1301 buf->used = 0; 1302 1303 buf->offset = (dma->byte_count + offset); 1304 buf->bus_address = agp_offset + offset; 1305 buf->address = (void *)(agp_offset + offset); 1306 buf->next = NULL; 1307 buf->waiting = 0; 1308 buf->pending = 0; 1309 buf->file_priv = NULL; 1310 1311 buf->dev_priv_size = dev->driver->dev_priv_size; 1312 buf->dev_private = malloc(buf->dev_priv_size, DRM_MEM_BUFS, 1313 M_NOWAIT | M_ZERO); 1314 if (!buf->dev_private) { 1315 /* Set count correctly so we free the proper amount. */ 1316 entry->buf_count = count; 1317 drm_cleanup_buf_error(dev, entry); 1318 DRM_UNLOCK(dev); 1319 atomic_dec(&dev->buf_alloc); 1320 return -ENOMEM; 1321 } 1322 1323 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); 1324 1325 offset += alignment; 1326 entry->buf_count++; 1327 byte_count += PAGE_SIZE << page_order; 1328 } 1329 1330 DRM_DEBUG("byte_count: %d\n", byte_count); 1331 1332 temp_buflist = realloc(dma->buflist, 1333 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), 1334 DRM_MEM_BUFS, M_NOWAIT); 1335 if (!temp_buflist) { 1336 /* Free the entry because it isn't valid */ 1337 drm_cleanup_buf_error(dev, entry); 1338 DRM_UNLOCK(dev); 1339 atomic_dec(&dev->buf_alloc); 1340 return -ENOMEM; 1341 } 1342 dma->buflist = temp_buflist; 1343 1344 for (i = 0; i < entry->buf_count; i++) { 1345 dma->buflist[i + dma->buf_count] = &entry->buflist[i]; 1346 } 1347 1348 dma->buf_count += entry->buf_count; 1349 dma->seg_count += entry->seg_count; 1350 dma->page_count += byte_count >> PAGE_SHIFT; 1351 dma->byte_count += byte_count; 1352 1353 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); 1354 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); 1355 1356 DRM_UNLOCK(dev); 1357 1358 request->count = entry->buf_count; 1359 request->size = size; 1360 1361 dma->flags = _DRM_DMA_USE_FB; 1362 1363 atomic_dec(&dev->buf_alloc); 1364 return 0; 1365 } 1366 1367 1368 /** 1369 * Add buffers for DMA transfers (ioctl). 1370 * 1371 * \param inode device inode. 1372 * \param file_priv DRM file private. 1373 * \param cmd command. 1374 * \param arg pointer to a struct drm_buf_desc request. 1375 * \return zero on success or a negative number on failure. 1376 * 1377 * According with the memory type specified in drm_buf_desc::flags and the 1378 * build options, it dispatches the call either to addbufs_agp(), 1379 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent 1380 * PCI memory respectively. 1381 */ 1382 int drm_addbufs(struct drm_device *dev, void *data, 1383 struct drm_file *file_priv) 1384 { 1385 struct drm_buf_desc *request = data; 1386 int ret; 1387 1388 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1389 return -EINVAL; 1390 1391 #if __OS_HAS_AGP 1392 if (request->flags & _DRM_AGP_BUFFER) 1393 ret = drm_addbufs_agp(dev, request); 1394 else 1395 #endif 1396 if (request->flags & _DRM_SG_BUFFER) 1397 ret = drm_addbufs_sg(dev, request); 1398 else if (request->flags & _DRM_FB_BUFFER) 1399 ret = drm_addbufs_fb(dev, request); 1400 else 1401 ret = drm_addbufs_pci(dev, request); 1402 1403 return ret; 1404 } 1405 1406 /** 1407 * Get information about the buffer mappings. 1408 * 1409 * This was originally mean for debugging purposes, or by a sophisticated 1410 * client library to determine how best to use the available buffers (e.g., 1411 * large buffers can be used for image transfer). 1412 * 1413 * \param inode device inode. 1414 * \param file_priv DRM file private. 1415 * \param cmd command. 1416 * \param arg pointer to a drm_buf_info structure. 1417 * \return zero on success or a negative number on failure. 1418 * 1419 * Increments drm_device::buf_use while holding the drm_device::count_lock 1420 * lock, preventing of allocating more buffers after this call. Information 1421 * about each requested buffer is then copied into user space. 1422 */ 1423 int drm_infobufs(struct drm_device *dev, void *data, 1424 struct drm_file *file_priv) 1425 { 1426 struct drm_device_dma *dma = dev->dma; 1427 struct drm_buf_info *request = data; 1428 int i; 1429 int count; 1430 1431 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1432 return -EINVAL; 1433 1434 if (!dma) 1435 return -EINVAL; 1436 1437 mtx_lock(&dev->count_lock); 1438 if (atomic_read(&dev->buf_alloc)) { 1439 mtx_unlock(&dev->count_lock); 1440 return -EBUSY; 1441 } 1442 ++dev->buf_use; /* Can't allocate more after this call */ 1443 mtx_unlock(&dev->count_lock); 1444 1445 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { 1446 if (dma->bufs[i].buf_count) 1447 ++count; 1448 } 1449 1450 DRM_DEBUG("count = %d\n", count); 1451 1452 if (request->count >= count) { 1453 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { 1454 if (dma->bufs[i].buf_count) { 1455 struct drm_buf_desc __user *to = 1456 &request->list[count]; 1457 struct drm_buf_entry *from = &dma->bufs[i]; 1458 struct drm_freelist *list = &dma->bufs[i].freelist; 1459 if (copy_to_user(&to->count, 1460 &from->buf_count, 1461 sizeof(from->buf_count)) || 1462 copy_to_user(&to->size, 1463 &from->buf_size, 1464 sizeof(from->buf_size)) || 1465 copy_to_user(&to->low_mark, 1466 &list->low_mark, 1467 sizeof(list->low_mark)) || 1468 copy_to_user(&to->high_mark, 1469 &list->high_mark, 1470 sizeof(list->high_mark))) 1471 return -EFAULT; 1472 1473 DRM_DEBUG("%d %d %d %d %d\n", 1474 i, 1475 dma->bufs[i].buf_count, 1476 dma->bufs[i].buf_size, 1477 dma->bufs[i].freelist.low_mark, 1478 dma->bufs[i].freelist.high_mark); 1479 ++count; 1480 } 1481 } 1482 } 1483 request->count = count; 1484 1485 return 0; 1486 } 1487 1488 /** 1489 * Specifies a low and high water mark for buffer allocation 1490 * 1491 * \param inode device inode. 1492 * \param file_priv DRM file private. 1493 * \param cmd command. 1494 * \param arg a pointer to a drm_buf_desc structure. 1495 * \return zero on success or a negative number on failure. 1496 * 1497 * Verifies that the size order is bounded between the admissible orders and 1498 * updates the respective drm_device_dma::bufs entry low and high water mark. 1499 * 1500 * \note This ioctl is deprecated and mostly never used. 1501 */ 1502 int drm_markbufs(struct drm_device *dev, void *data, 1503 struct drm_file *file_priv) 1504 { 1505 struct drm_device_dma *dma = dev->dma; 1506 struct drm_buf_desc *request = data; 1507 int order; 1508 struct drm_buf_entry *entry; 1509 1510 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1511 return -EINVAL; 1512 1513 if (!dma) 1514 return -EINVAL; 1515 1516 DRM_DEBUG("%d, %d, %d\n", 1517 request->size, request->low_mark, request->high_mark); 1518 order = drm_order(request->size); 1519 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) 1520 return -EINVAL; 1521 entry = &dma->bufs[order]; 1522 1523 if (request->low_mark < 0 || request->low_mark > entry->buf_count) 1524 return -EINVAL; 1525 if (request->high_mark < 0 || request->high_mark > entry->buf_count) 1526 return -EINVAL; 1527 1528 entry->freelist.low_mark = request->low_mark; 1529 entry->freelist.high_mark = request->high_mark; 1530 1531 return 0; 1532 } 1533 1534 /** 1535 * Unreserve the buffers in list, previously reserved using drmDMA. 1536 * 1537 * \param inode device inode. 1538 * \param file_priv DRM file private. 1539 * \param cmd command. 1540 * \param arg pointer to a drm_buf_free structure. 1541 * \return zero on success or a negative number on failure. 1542 * 1543 * Calls free_buffer() for each used buffer. 1544 * This function is primarily used for debugging. 1545 */ 1546 int drm_freebufs(struct drm_device *dev, void *data, 1547 struct drm_file *file_priv) 1548 { 1549 struct drm_device_dma *dma = dev->dma; 1550 struct drm_buf_free *request = data; 1551 int i; 1552 int idx; 1553 struct drm_buf *buf; 1554 1555 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1556 return -EINVAL; 1557 1558 if (!dma) 1559 return -EINVAL; 1560 1561 DRM_DEBUG("%d\n", request->count); 1562 for (i = 0; i < request->count; i++) { 1563 if (copy_from_user(&idx, &request->list[i], sizeof(idx))) 1564 return -EFAULT; 1565 if (idx < 0 || idx >= dma->buf_count) { 1566 DRM_ERROR("Index %d (of %d max)\n", 1567 idx, dma->buf_count - 1); 1568 return -EINVAL; 1569 } 1570 buf = dma->buflist[idx]; 1571 if (buf->file_priv != file_priv) { 1572 DRM_ERROR("Process %d freeing buffer not owned\n", 1573 DRM_CURRENTPID); 1574 return -EINVAL; 1575 } 1576 drm_free_buffer(dev, buf); 1577 } 1578 1579 return 0; 1580 } 1581 1582 /** 1583 * Maps all of the DMA buffers into client-virtual space (ioctl). 1584 * 1585 * \param inode device inode. 1586 * \param file_priv DRM file private. 1587 * \param cmd command. 1588 * \param arg pointer to a drm_buf_map structure. 1589 * \return zero on success or a negative number on failure. 1590 * 1591 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information 1592 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with 1593 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls 1594 * drm_mmap_dma(). 1595 */ 1596 int drm_mapbufs(struct drm_device *dev, void *data, 1597 struct drm_file *file_priv) 1598 { 1599 struct drm_device_dma *dma = dev->dma; 1600 int retcode = 0; 1601 const int zero = 0; 1602 vm_offset_t virtual; 1603 vm_offset_t address; 1604 struct vmspace *vms; 1605 struct drm_buf_map *request = data; 1606 int i; 1607 1608 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) 1609 return -EINVAL; 1610 1611 if (!dma) 1612 return -EINVAL; 1613 1614 mtx_lock(&dev->count_lock); 1615 if (atomic_read(&dev->buf_alloc)) { 1616 mtx_unlock(&dev->count_lock); 1617 return -EBUSY; 1618 } 1619 dev->buf_use++; /* Can't allocate more after this call */ 1620 mtx_unlock(&dev->count_lock); 1621 1622 vms = DRM_CURPROC->td_proc->p_vmspace; 1623 1624 if (request->count >= dma->buf_count) { 1625 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP)) 1626 || (drm_core_check_feature(dev, DRIVER_SG) 1627 && (dma->flags & _DRM_DMA_USE_SG)) 1628 || (drm_core_check_feature(dev, DRIVER_FB_DMA) 1629 && (dma->flags & _DRM_DMA_USE_FB))) { 1630 struct drm_local_map *map = dev->agp_buffer_map; 1631 vm_ooffset_t token = dev->agp_buffer_token; 1632 1633 if (!map) { 1634 retcode = -EINVAL; 1635 goto done; 1636 } 1637 retcode = vm_mmap(&vms->vm_map, &virtual, map->size, 1638 VM_PROT_RW, VM_PROT_RW, MAP_SHARED | MAP_NOSYNC, 1639 OBJT_DEVICE, file_priv->minor->device, token); 1640 } else { 1641 retcode = vm_mmap(&vms->vm_map, &virtual, dma->byte_count, 1642 VM_PROT_RW, VM_PROT_RW, MAP_SHARED | MAP_NOSYNC, 1643 OBJT_DEVICE, file_priv->minor->device, 0); 1644 } 1645 if (retcode) { 1646 /* Real error */ 1647 retcode = -retcode; 1648 goto done; 1649 } 1650 request->virtual = (void __user *)virtual; 1651 1652 for (i = 0; i < dma->buf_count; i++) { 1653 if (copy_to_user(&request->list[i].idx, 1654 &dma->buflist[i]->idx, 1655 sizeof(request->list[0].idx))) { 1656 retcode = -EFAULT; 1657 goto done; 1658 } 1659 if (copy_to_user(&request->list[i].total, 1660 &dma->buflist[i]->total, 1661 sizeof(request->list[0].total))) { 1662 retcode = -EFAULT; 1663 goto done; 1664 } 1665 if (copy_to_user(&request->list[i].used, 1666 &zero, sizeof(zero))) { 1667 retcode = -EFAULT; 1668 goto done; 1669 } 1670 address = virtual + dma->buflist[i]->offset; /* *** */ 1671 if (copy_to_user(&request->list[i].address, 1672 &address, sizeof(address))) { 1673 retcode = -EFAULT; 1674 goto done; 1675 } 1676 } 1677 } 1678 done: 1679 request->count = dma->buf_count; 1680 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode); 1681 1682 return retcode; 1683 } 1684 1685 /** 1686 * Compute size order. Returns the exponent of the smaller power of two which 1687 * is greater or equal to given number. 1688 * 1689 * \param size size. 1690 * \return order. 1691 * 1692 * \todo Can be made faster. 1693 */ 1694 int drm_order(unsigned long size) 1695 { 1696 int order; 1697 unsigned long tmp; 1698 1699 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ; 1700 1701 if (size & (size - 1)) 1702 ++order; 1703 1704 return order; 1705 } 1706 EXPORT_SYMBOL(drm_order);
Cache object: 6757dd15de1c8cedbf4c16f305d58a7c
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