1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 /* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 */ 30 31 #ifndef _TTM_BO_API_H_ 32 #define _TTM_BO_API_H_ 33 34 #include <drm/drmP.h> 35 #include <drm/drm_hashtab.h> 36 #include <drm/drm_vma_manager.h> 37 #include <linux/kref.h> 38 #include <linux/list.h> 39 #include <linux/wait.h> 40 #include <linux/mutex.h> 41 #include <linux/mm.h> 42 #include <linux/bitmap.h> 43 #include <linux/reservation.h> 44 45 struct ttm_bo_device; 46 47 struct drm_mm_node; 48 49 /** 50 * struct ttm_place 51 * 52 * @fpfn: first valid page frame number to put the object 53 * @lpfn: last valid page frame number to put the object 54 * @flags: memory domain and caching flags for the object 55 * 56 * Structure indicating a possible place to put an object. 57 */ 58 struct ttm_place { 59 unsigned fpfn; 60 unsigned lpfn; 61 uint32_t flags; 62 }; 63 64 /** 65 * struct ttm_placement 66 * 67 * @fpfn: first valid page frame number to put the object 68 * @lpfn: last valid page frame number to put the object 69 * @num_placement: number of preferred placements 70 * @placement: preferred placements 71 * @num_busy_placement: number of preferred placements when need to evict buffer 72 * @busy_placement: preferred placements when need to evict buffer 73 * 74 * Structure indicating the placement you request for an object. 75 */ 76 struct ttm_placement { 77 unsigned fpfn; 78 unsigned lpfn; 79 unsigned num_placement; 80 const struct ttm_place *placement; 81 unsigned num_busy_placement; 82 const struct ttm_place *busy_placement; 83 }; 84 85 /** 86 * struct ttm_bus_placement 87 * 88 * @addr: mapped virtual address 89 * @base: bus base address 90 * @is_iomem: is this io memory ? 91 * @size: size in byte 92 * @offset: offset from the base address 93 * @io_reserved_vm: The VM system has a refcount in @io_reserved_count 94 * @io_reserved_count: Refcounting the numbers of callers to ttm_mem_io_reserve 95 * 96 * Structure indicating the bus placement of an object. 97 */ 98 struct ttm_bus_placement { 99 void *addr; 100 unsigned long base; 101 unsigned long size; 102 unsigned long offset; 103 bool is_iomem; 104 bool io_reserved_vm; 105 uint64_t io_reserved_count; 106 }; 107 108 109 /** 110 * struct ttm_mem_reg 111 * 112 * @mm_node: Memory manager node. 113 * @size: Requested size of memory region. 114 * @num_pages: Actual size of memory region in pages. 115 * @page_alignment: Page alignment. 116 * @placement: Placement flags. 117 * @bus: Placement on io bus accessible to the CPU 118 * 119 * Structure indicating the placement and space resources used by a 120 * buffer object. 121 */ 122 123 struct ttm_mem_reg { 124 void *mm_node; 125 unsigned long start; 126 unsigned long size; 127 unsigned long num_pages; 128 uint32_t page_alignment; 129 uint32_t mem_type; 130 uint32_t placement; 131 struct ttm_bus_placement bus; 132 }; 133 134 /** 135 * enum ttm_bo_type 136 * 137 * @ttm_bo_type_device: These are 'normal' buffers that can 138 * be mmapped by user space. Each of these bos occupy a slot in the 139 * device address space, that can be used for normal vm operations. 140 * 141 * @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers, 142 * but they cannot be accessed from user-space. For kernel-only use. 143 * 144 * @ttm_bo_type_sg: Buffer made from dmabuf sg table shared with another 145 * driver. 146 */ 147 148 enum ttm_bo_type { 149 ttm_bo_type_device, 150 ttm_bo_type_kernel, 151 ttm_bo_type_sg 152 }; 153 154 struct ttm_tt; 155 156 /** 157 * struct ttm_buffer_object 158 * 159 * @bdev: Pointer to the buffer object device structure. 160 * @type: The bo type. 161 * @destroy: Destruction function. If NULL, kfree is used. 162 * @num_pages: Actual number of pages. 163 * @acc_size: Accounted size for this object. 164 * @kref: Reference count of this buffer object. When this refcount reaches 165 * zero, the object is put on the delayed delete list. 166 * @list_kref: List reference count of this buffer object. This member is 167 * used to avoid destruction while the buffer object is still on a list. 168 * Lru lists may keep one refcount, the delayed delete list, and kref != 0 169 * keeps one refcount. When this refcount reaches zero, 170 * the object is destroyed. 171 * @mem: structure describing current placement. 172 * @persistent_swap_storage: Usually the swap storage is deleted for buffers 173 * pinned in physical memory. If this behaviour is not desired, this member 174 * holds a pointer to a persistent shmem object. 175 * @ttm: TTM structure holding system pages. 176 * @evicted: Whether the object was evicted without user-space knowing. 177 * @cpu_writes: For synchronization. Number of cpu writers. 178 * @lru: List head for the lru list. 179 * @ddestroy: List head for the delayed destroy list. 180 * @swap: List head for swap LRU list. 181 * @sync_obj: Pointer to a synchronization object. 182 * @priv_flags: Flags describing buffer object internal state. 183 * @vma_node: Address space manager node. 184 * @offset: The current GPU offset, which can have different meanings 185 * depending on the memory type. For SYSTEM type memory, it should be 0. 186 * @cur_placement: Hint of current placement. 187 * @wu_mutex: Wait unreserved mutex. 188 * 189 * Base class for TTM buffer object, that deals with data placement and CPU 190 * mappings. GPU mappings are really up to the driver, but for simpler GPUs 191 * the driver can usually use the placement offset @offset directly as the 192 * GPU virtual address. For drivers implementing multiple 193 * GPU memory manager contexts, the driver should manage the address space 194 * in these contexts separately and use these objects to get the correct 195 * placement and caching for these GPU maps. This makes it possible to use 196 * these objects for even quite elaborate memory management schemes. 197 * The destroy member, the API visibility of this object makes it possible 198 * to derive driver specific types. 199 */ 200 201 struct ttm_buffer_object { 202 /** 203 * Members constant at init. 204 */ 205 206 struct ttm_bo_global *glob; 207 struct ttm_bo_device *bdev; 208 enum ttm_bo_type type; 209 void (*destroy) (struct ttm_buffer_object *); 210 unsigned long num_pages; 211 size_t acc_size; 212 213 /** 214 * Members not needing protection. 215 */ 216 217 struct kref kref; 218 struct kref list_kref; 219 220 /** 221 * Members protected by the bo::resv::reserved lock. 222 */ 223 224 struct ttm_mem_reg mem; 225 struct vm_object *persistent_swap_storage; 226 struct ttm_tt *ttm; 227 bool evicted; 228 229 /** 230 * Members protected by the bo::reserved lock only when written to. 231 */ 232 233 atomic_t cpu_writers; 234 235 /** 236 * Members protected by the bdev::lru_lock. 237 */ 238 239 struct list_head lru; 240 struct list_head ddestroy; 241 struct list_head swap; 242 struct list_head io_reserve_lru; 243 244 /** 245 * Members protected by struct buffer_object_device::fence_lock 246 * In addition, setting sync_obj to anything else 247 * than NULL requires bo::reserved to be held. This allows for 248 * checking NULL while reserved but not holding the mentioned lock. 249 */ 250 251 void *sync_obj; 252 unsigned long priv_flags; 253 254 RB_ENTRY(ttm_buffer_object) vm_rb; /* DragonFly */ 255 struct drm_vma_offset_node vma_node; 256 257 /** 258 * Special members that are protected by the reserve lock 259 * and the bo::lock when written to. Can be read with 260 * either of these locks held. 261 */ 262 263 unsigned long offset; 264 uint32_t cur_placement; 265 266 struct sg_table *sg; 267 268 struct reservation_object *resv; 269 struct reservation_object ttm_resv; 270 struct lock wu_mutex; 271 }; 272 273 /** 274 * struct ttm_bo_kmap_obj 275 * 276 * @virtual: The current kernel virtual address. 277 * @page: The page when kmap'ing a single page. 278 * @bo_kmap_type: Type of bo_kmap. 279 * 280 * Object describing a kernel mapping. Since a TTM bo may be located 281 * in various memory types with various caching policies, the 282 * mapping can either be an ioremap, a vmap, a kmap or part of a 283 * premapped region. 284 */ 285 286 #define TTM_BO_MAP_IOMEM_MASK 0x80 287 struct ttm_bo_kmap_obj { 288 void *virtual; 289 struct page *page; 290 enum { 291 ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK, 292 ttm_bo_map_vmap = 2, 293 ttm_bo_map_kmap = 3, 294 ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK, 295 } bo_kmap_type; 296 struct ttm_buffer_object *bo; 297 }; 298 299 /** 300 * ttm_bo_reference - reference a struct ttm_buffer_object 301 * 302 * @bo: The buffer object. 303 * 304 * Returns a refcounted pointer to a buffer object. 305 */ 306 307 static inline struct ttm_buffer_object * 308 ttm_bo_reference(struct ttm_buffer_object *bo) 309 { 310 kref_get(&bo->kref); 311 return bo; 312 } 313 314 /** 315 * ttm_bo_wait - wait for buffer idle. 316 * 317 * @bo: The buffer object. 318 * @interruptible: Use interruptible wait. 319 * @no_wait: Return immediately if buffer is busy. 320 * 321 * This function must be called with the bo::mutex held, and makes 322 * sure any previous rendering to the buffer is completed. 323 * Note: It might be necessary to block validations before the 324 * wait by reserving the buffer. 325 * Returns -EBUSY if no_wait is true and the buffer is busy. 326 * Returns -ERESTARTSYS if interrupted by a signal. 327 */ 328 extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy, 329 bool interruptible, bool no_wait); 330 /** 331 * ttm_bo_validate 332 * 333 * @bo: The buffer object. 334 * @placement: Proposed placement for the buffer object. 335 * @interruptible: Sleep interruptible if sleeping. 336 * @no_wait_gpu: Return immediately if the GPU is busy. 337 * 338 * Changes placement and caching policy of the buffer object 339 * according proposed placement. 340 * Returns 341 * -EINVAL on invalid proposed placement. 342 * -ENOMEM on out-of-memory condition. 343 * -EBUSY if no_wait is true and buffer busy. 344 * -ERESTARTSYS if interrupted by a signal. 345 */ 346 extern int ttm_bo_validate(struct ttm_buffer_object *bo, 347 struct ttm_placement *placement, 348 bool interruptible, 349 bool no_wait_gpu); 350 351 /** 352 * ttm_bo_unref 353 * 354 * @bo: The buffer object. 355 * 356 * Unreference and clear a pointer to a buffer object. 357 */ 358 extern void ttm_bo_unref(struct ttm_buffer_object **bo); 359 360 361 /** 362 * ttm_bo_list_ref_sub 363 * 364 * @bo: The buffer object. 365 * @count: The number of references with which to decrease @bo::list_kref; 366 * @never_free: The refcount should not reach zero with this operation. 367 * 368 * Release @count lru list references to this buffer object. 369 */ 370 extern void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count, 371 bool never_free); 372 373 /** 374 * ttm_bo_add_to_lru 375 * 376 * @bo: The buffer object. 377 * 378 * Add this bo to the relevant mem type lru and, if it's backed by 379 * system pages (ttms) to the swap list. 380 * This function must be called with struct ttm_bo_global::lru_lock held, and 381 * is typically called immediately prior to unreserving a bo. 382 */ 383 extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo); 384 385 /** 386 * ttm_bo_del_from_lru 387 * 388 * @bo: The buffer object. 389 * 390 * Remove this bo from all lru lists used to lookup and reserve an object. 391 * This function must be called with struct ttm_bo_global::lru_lock held, 392 * and is usually called just immediately after the bo has been reserved to 393 * avoid recursive reservation from lru lists. 394 */ 395 extern int ttm_bo_del_from_lru(struct ttm_buffer_object *bo); 396 397 398 /** 399 * ttm_bo_lock_delayed_workqueue 400 * 401 * Prevent the delayed workqueue from running. 402 * Returns 403 * True if the workqueue was queued at the time 404 */ 405 extern int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev); 406 407 /** 408 * ttm_bo_unlock_delayed_workqueue 409 * 410 * Allows the delayed workqueue to run. 411 */ 412 extern void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, 413 int resched); 414 415 /** 416 * ttm_bo_synccpu_write_grab 417 * 418 * @bo: The buffer object: 419 * @no_wait: Return immediately if buffer is busy. 420 * 421 * Synchronizes a buffer object for CPU RW access. This means 422 * command submission that affects the buffer will return -EBUSY 423 * until ttm_bo_synccpu_write_release is called. 424 * 425 * Returns 426 * -EBUSY if the buffer is busy and no_wait is true. 427 * -ERESTARTSYS if interrupted by a signal. 428 */ 429 extern int 430 ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait); 431 432 /** 433 * ttm_bo_synccpu_write_release: 434 * 435 * @bo : The buffer object. 436 * 437 * Releases a synccpu lock. 438 */ 439 extern void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo); 440 441 /** 442 * ttm_bo_acc_size 443 * 444 * @bdev: Pointer to a ttm_bo_device struct. 445 * @bo_size: size of the buffer object in byte. 446 * @struct_size: size of the structure holding buffer object datas 447 * 448 * Returns size to account for a buffer object 449 */ 450 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev, 451 unsigned long bo_size, 452 unsigned struct_size); 453 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev, 454 unsigned long bo_size, 455 unsigned struct_size); 456 457 /** 458 * ttm_bo_init 459 * 460 * @bdev: Pointer to a ttm_bo_device struct. 461 * @bo: Pointer to a ttm_buffer_object to be initialized. 462 * @size: Requested size of buffer object. 463 * @type: Requested type of buffer object. 464 * @flags: Initial placement flags. 465 * @page_alignment: Data alignment in pages. 466 * @interruptible: If needing to sleep to wait for GPU resources, 467 * sleep interruptible. 468 * @persistent_swap_storage: Usually the swap storage is deleted for buffers 469 * pinned in physical memory. If this behaviour is not desired, this member 470 * holds a pointer to a persistent shmem object. Typically, this would 471 * point to the shmem object backing a GEM object if TTM is used to back a 472 * GEM user interface. 473 * @acc_size: Accounted size for this object. 474 * @destroy: Destroy function. Use NULL for kfree(). 475 * 476 * This function initializes a pre-allocated struct ttm_buffer_object. 477 * As this object may be part of a larger structure, this function, 478 * together with the @destroy function, 479 * enables driver-specific objects derived from a ttm_buffer_object. 480 * On successful return, the object kref and list_kref are set to 1. 481 * If a failure occurs, the function will call the @destroy function, or 482 * kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is 483 * illegal and will likely cause memory corruption. 484 * 485 * Returns 486 * -ENOMEM: Out of memory. 487 * -EINVAL: Invalid placement flags. 488 * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources. 489 */ 490 491 extern int ttm_bo_init(struct ttm_bo_device *bdev, 492 struct ttm_buffer_object *bo, 493 unsigned long size, 494 enum ttm_bo_type type, 495 struct ttm_placement *placement, 496 uint32_t page_alignment, 497 bool interrubtible, 498 struct vm_object *persistent_swap_storage, 499 size_t acc_size, 500 struct sg_table *sg, 501 void (*destroy) (struct ttm_buffer_object *)); 502 503 /** 504 * ttm_bo_create 505 * 506 * @bdev: Pointer to a ttm_bo_device struct. 507 * @size: Requested size of buffer object. 508 * @type: Requested type of buffer object. 509 * @placement: Initial placement. 510 * @page_alignment: Data alignment in pages. 511 * @interruptible: If needing to sleep while waiting for GPU resources, 512 * sleep interruptible. 513 * @persistent_swap_storage: Usually the swap storage is deleted for buffers 514 * pinned in physical memory. If this behaviour is not desired, this member 515 * holds a pointer to a persistent shmem object. Typically, this would 516 * point to the shmem object backing a GEM object if TTM is used to back a 517 * GEM user interface. 518 * @p_bo: On successful completion *p_bo points to the created object. 519 * 520 * This function allocates a ttm_buffer_object, and then calls ttm_bo_init 521 * on that object. The destroy function is set to kfree(). 522 * Returns 523 * -ENOMEM: Out of memory. 524 * -EINVAL: Invalid placement flags. 525 * -ERESTARTSYS: Interrupted by signal while waiting for resources. 526 */ 527 528 extern int ttm_bo_create(struct ttm_bo_device *bdev, 529 unsigned long size, 530 enum ttm_bo_type type, 531 struct ttm_placement *placement, 532 uint32_t page_alignment, 533 bool interruptible, 534 struct vm_object *persistent_swap_storage, 535 struct ttm_buffer_object **p_bo); 536 537 /** 538 * ttm_bo_check_placement 539 * 540 * @bo: the buffer object. 541 * @placement: placements 542 * 543 * Performs minimal validity checking on an intended change of 544 * placement flags. 545 * Returns 546 * -EINVAL: Intended change is invalid or not allowed. 547 */ 548 extern int ttm_bo_check_placement(struct ttm_buffer_object *bo, 549 struct ttm_placement *placement); 550 551 /** 552 * ttm_bo_init_mm 553 * 554 * @bdev: Pointer to a ttm_bo_device struct. 555 * @mem_type: The memory type. 556 * @p_size: size managed area in pages. 557 * 558 * Initialize a manager for a given memory type. 559 * Note: if part of driver firstopen, it must be protected from a 560 * potentially racing lastclose. 561 * Returns: 562 * -EINVAL: invalid size or memory type. 563 * -ENOMEM: Not enough memory. 564 * May also return driver-specified errors. 565 */ 566 567 extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type, 568 unsigned long p_size); 569 /** 570 * ttm_bo_clean_mm 571 * 572 * @bdev: Pointer to a ttm_bo_device struct. 573 * @mem_type: The memory type. 574 * 575 * Take down a manager for a given memory type after first walking 576 * the LRU list to evict any buffers left alive. 577 * 578 * Normally, this function is part of lastclose() or unload(), and at that 579 * point there shouldn't be any buffers left created by user-space, since 580 * there should've been removed by the file descriptor release() method. 581 * However, before this function is run, make sure to signal all sync objects, 582 * and verify that the delayed delete queue is empty. The driver must also 583 * make sure that there are no NO_EVICT buffers present in this memory type 584 * when the call is made. 585 * 586 * If this function is part of a VT switch, the caller must make sure that 587 * there are no appications currently validating buffers before this 588 * function is called. The caller can do that by first taking the 589 * struct ttm_bo_device::ttm_lock in write mode. 590 * 591 * Returns: 592 * -EINVAL: invalid or uninitialized memory type. 593 * -EBUSY: There are still buffers left in this memory type. 594 */ 595 596 extern int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type); 597 598 /** 599 * ttm_bo_evict_mm 600 * 601 * @bdev: Pointer to a ttm_bo_device struct. 602 * @mem_type: The memory type. 603 * 604 * Evicts all buffers on the lru list of the memory type. 605 * This is normally part of a VT switch or an 606 * out-of-memory-space-due-to-fragmentation handler. 607 * The caller must make sure that there are no other processes 608 * currently validating buffers, and can do that by taking the 609 * struct ttm_bo_device::ttm_lock in write mode. 610 * 611 * Returns: 612 * -EINVAL: Invalid or uninitialized memory type. 613 * -ERESTARTSYS: The call was interrupted by a signal while waiting to 614 * evict a buffer. 615 */ 616 617 extern int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type); 618 619 /** 620 * ttm_kmap_obj_virtual 621 * 622 * @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap. 623 * @is_iomem: Pointer to an integer that on return indicates 1 if the 624 * virtual map is io memory, 0 if normal memory. 625 * 626 * Returns the virtual address of a buffer object area mapped by ttm_bo_kmap. 627 * If *is_iomem is 1 on return, the virtual address points to an io memory area, 628 * that should strictly be accessed by the iowriteXX() and similar functions. 629 */ 630 631 static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map, 632 bool *is_iomem) 633 { 634 *is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK); 635 return map->virtual; 636 } 637 638 /** 639 * ttm_bo_kmap 640 * 641 * @bo: The buffer object. 642 * @start_page: The first page to map. 643 * @num_pages: Number of pages to map. 644 * @map: pointer to a struct ttm_bo_kmap_obj representing the map. 645 * 646 * Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the 647 * data in the buffer object. The ttm_kmap_obj_virtual function can then be 648 * used to obtain a virtual address to the data. 649 * 650 * Returns 651 * -ENOMEM: Out of memory. 652 * -EINVAL: Invalid range. 653 */ 654 655 extern int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page, 656 unsigned long num_pages, struct ttm_bo_kmap_obj *map); 657 658 /** 659 * ttm_bo_kunmap 660 * 661 * @map: Object describing the map to unmap. 662 * 663 * Unmaps a kernel map set up by ttm_bo_kmap. 664 */ 665 666 extern void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map); 667 668 /** 669 * ttm_fbdev_mmap - mmap fbdev memory backed by a ttm buffer object. 670 * 671 * @vma: vma as input from the fbdev mmap method. 672 * @bo: The bo backing the address space. The address space will 673 * have the same size as the bo, and start at offset 0. 674 * 675 * This function is intended to be called by the fbdev mmap method 676 * if the fbdev address space is to be backed by a bo. 677 */ 678 679 extern int ttm_fbdev_mmap(struct vm_area_struct *vma, 680 struct ttm_buffer_object *bo); 681 682 /** 683 * ttm_bo_mmap - mmap out of the ttm device address space. 684 * 685 * @filp: filp as input from the mmap method. 686 * @vma: vma as input from the mmap method. 687 * @bdev: Pointer to the ttm_bo_device with the address space manager. 688 * 689 * This function is intended to be called by the device mmap method. 690 * if the device address space is to be backed by the bo manager. 691 */ 692 693 extern int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, 694 struct ttm_bo_device *bdev); 695 696 /** 697 * ttm_bo_io 698 * 699 * @bdev: Pointer to the struct ttm_bo_device. 700 * @filp: Pointer to the struct file attempting to read / write. 701 * @wbuf: User-space pointer to address of buffer to write. NULL on read. 702 * @rbuf: User-space pointer to address of buffer to read into. 703 * Null on write. 704 * @count: Number of bytes to read / write. 705 * @f_pos: Pointer to current file position. 706 * @write: 1 for read, 0 for write. 707 * 708 * This function implements read / write into ttm buffer objects, and is 709 * intended to 710 * be called from the fops::read and fops::write method. 711 * Returns: 712 * See man (2) write, man(2) read. In particular, 713 * the function may return -ERESTARTSYS if 714 * interrupted by a signal. 715 */ 716 717 extern ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp, 718 const char __user *wbuf, char __user *rbuf, 719 size_t count, loff_t *f_pos, bool write); 720 721 extern void ttm_bo_swapout_all(struct ttm_bo_device *bdev); 722 extern int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo); 723 #endif 724