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#ifndef _TTM_BO_DRIVER_H_ 31#define _TTM_BO_DRIVER_H_ 32 33#include "ttm/ttm_bo_api.h" 34#include "ttm/ttm_memory.h" 35#include "ttm/ttm_module.h" 36#include "drm_mm.h" 37#include "linux/workqueue.h" 38#include "linux/fs.h" 39#include "linux/spinlock.h" 40 41struct ttm_backend; 42 43struct ttm_backend_func { 44 /** 45 * struct ttm_backend_func member populate 46 * 47 * @backend: Pointer to a struct ttm_backend. 48 * @num_pages: Number of pages to populate. 49 * @pages: Array of pointers to ttm pages. 50 * @dummy_read_page: Page to be used instead of NULL pages in the 51 * array @pages. 52 * 53 * Populate the backend with ttm pages. Depending on the backend, 54 * it may or may not copy the @pages array. 55 */ 56 int (*populate) (struct ttm_backend *backend, 57 unsigned long num_pages, struct page **pages, 58 struct page *dummy_read_page); 59 /** 60 * struct ttm_backend_func member clear 61 * 62 * @backend: Pointer to a struct ttm_backend. 63 * 64 * This is an "unpopulate" function. Release all resources 65 * allocated with populate. 66 */ 67 void (*clear) (struct ttm_backend *backend); 68 69 /** 70 * struct ttm_backend_func member bind 71 * 72 * @backend: Pointer to a struct ttm_backend. 73 * @bo_mem: Pointer to a struct ttm_mem_reg describing the 74 * memory type and location for binding. 75 * 76 * Bind the backend pages into the aperture in the location 77 * indicated by @bo_mem. This function should be able to handle 78 * differences between aperture- and system page sizes. 79 */ 80 int (*bind) (struct ttm_backend *backend, struct ttm_mem_reg *bo_mem); 81 82 /** 83 * struct ttm_backend_func member unbind 84 * 85 * @backend: Pointer to a struct ttm_backend. 86 * 87 * Unbind previously bound backend pages. This function should be 88 * able to handle differences between aperture- and system page sizes. 89 */ 90 int (*unbind) (struct ttm_backend *backend); 91 92 /** 93 * struct ttm_backend_func member destroy 94 * 95 * @backend: Pointer to a struct ttm_backend. 96 * 97 * Destroy the backend. 98 */ 99 void (*destroy) (struct ttm_backend *backend); 100}; 101 102/** 103 * struct ttm_backend 104 * 105 * @bdev: Pointer to a struct ttm_bo_device. 106 * @flags: For driver use. 107 * @func: Pointer to a struct ttm_backend_func that describes 108 * the backend methods. 109 * 110 */ 111 112struct ttm_backend { 113 struct ttm_bo_device *bdev; 114 uint32_t flags; 115 struct ttm_backend_func *func; 116}; 117 118#define TTM_PAGE_FLAG_VMALLOC (1 << 0) 119#define TTM_PAGE_FLAG_USER (1 << 1) 120#define TTM_PAGE_FLAG_USER_DIRTY (1 << 2) 121#define TTM_PAGE_FLAG_WRITE (1 << 3) 122#define TTM_PAGE_FLAG_SWAPPED (1 << 4) 123#define TTM_PAGE_FLAG_PERSISTANT_SWAP (1 << 5) 124#define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6) 125#define TTM_PAGE_FLAG_DMA32 (1 << 7) 126 127enum ttm_caching_state { 128 tt_uncached, 129 tt_wc, 130 tt_cached 131}; 132 133/** 134 * struct ttm_tt 135 * 136 * @dummy_read_page: Page to map where the ttm_tt page array contains a NULL 137 * pointer. 138 * @pages: Array of pages backing the data. 139 * @first_himem_page: Himem pages are put last in the page array, which 140 * enables us to run caching attribute changes on only the first part 141 * of the page array containing lomem pages. This is the index of the 142 * first himem page. 143 * @last_lomem_page: Index of the last lomem page in the page array. 144 * @num_pages: Number of pages in the page array. 145 * @bdev: Pointer to the current struct ttm_bo_device. 146 * @be: Pointer to the ttm backend. 147 * @tsk: The task for user ttm. 148 * @start: virtual address for user ttm. 149 * @swap_storage: Pointer to shmem struct file for swap storage. 150 * @caching_state: The current caching state of the pages. 151 * @state: The current binding state of the pages. 152 * 153 * This is a structure holding the pages, caching- and aperture binding 154 * status for a buffer object that isn't backed by fixed (VRAM / AGP) 155 * memory. 156 */ 157 158struct ttm_tt { 159 struct page *dummy_read_page; 160 struct page **pages; 161 long first_himem_page; 162 long last_lomem_page; 163 uint32_t page_flags; 164 unsigned long num_pages; 165 struct ttm_bo_global *glob; 166 struct ttm_backend *be; 167 struct task_struct *tsk; 168 unsigned long start; 169 struct file *swap_storage; 170 enum ttm_caching_state caching_state; 171 enum { 172 tt_bound, 173 tt_unbound, 174 tt_unpopulated, 175 } state; 176}; 177 178#define TTM_MEMTYPE_FLAG_FIXED (1 << 0) /* Fixed (on-card) PCI memory */ 179#define TTM_MEMTYPE_FLAG_MAPPABLE (1 << 1) /* Memory mappable */ 180#define TTM_MEMTYPE_FLAG_NEEDS_IOREMAP (1 << 2) /* Fixed memory needs ioremap 181 before kernel access. */ 182#define TTM_MEMTYPE_FLAG_CMA (1 << 3) /* Can't map aperture */ 183 184/** 185 * struct ttm_mem_type_manager 186 * 187 * @has_type: The memory type has been initialized. 188 * @use_type: The memory type is enabled. 189 * @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory 190 * managed by this memory type. 191 * @gpu_offset: If used, the GPU offset of the first managed page of 192 * fixed memory or the first managed location in an aperture. 193 * @io_offset: The io_offset of the first managed page of IO memory or 194 * the first managed location in an aperture. For TTM_MEMTYPE_FLAG_CMA 195 * memory, this should be set to NULL. 196 * @io_size: The size of a managed IO region (fixed memory or aperture). 197 * @io_addr: Virtual kernel address if the io region is pre-mapped. For 198 * TTM_MEMTYPE_FLAG_NEEDS_IOREMAP there is no pre-mapped io map and 199 * @io_addr should be set to NULL. 200 * @size: Size of the managed region. 201 * @available_caching: A mask of available caching types, TTM_PL_FLAG_XX, 202 * as defined in ttm_placement_common.h 203 * @default_caching: The default caching policy used for a buffer object 204 * placed in this memory type if the user doesn't provide one. 205 * @manager: The range manager used for this memory type. FIXME: If the aperture 206 * has a page size different from the underlying system, the granularity 207 * of this manager should take care of this. But the range allocating code 208 * in ttm_bo.c needs to be modified for this. 209 * @lru: The lru list for this memory type. 210 * 211 * This structure is used to identify and manage memory types for a device. 212 * It's set up by the ttm_bo_driver::init_mem_type method. 213 */ 214 215struct ttm_mem_type_manager { 216 217 /* 218 * No protection. Constant from start. 219 */ 220 221 bool has_type; 222 bool use_type; 223 uint32_t flags; 224 unsigned long gpu_offset; 225 unsigned long io_offset; 226 unsigned long io_size; 227 void *io_addr; 228 uint64_t size; 229 uint32_t available_caching; 230 uint32_t default_caching; 231 232 /* 233 * Protected by the bdev->lru_lock. 234 * TODO: Consider one lru_lock per ttm_mem_type_manager. 235 * Plays ill with list removal, though. 236 */ 237 238 struct drm_mm manager; 239 struct list_head lru; 240}; 241 242/** 243 * struct ttm_bo_driver 244 * 245 * @mem_type_prio: Priority array of memory types to place a buffer object in 246 * if it fits without evicting buffers from any of these memory types. 247 * @mem_busy_prio: Priority array of memory types to place a buffer object in 248 * if it needs to evict buffers to make room. 249 * @num_mem_type_prio: Number of elements in the @mem_type_prio array. 250 * @num_mem_busy_prio: Number of elements in the @num_mem_busy_prio array. 251 * @create_ttm_backend_entry: Callback to create a struct ttm_backend. 252 * @invalidate_caches: Callback to invalidate read caches when a buffer object 253 * has been evicted. 254 * @init_mem_type: Callback to initialize a struct ttm_mem_type_manager 255 * structure. 256 * @evict_flags: Callback to obtain placement flags when a buffer is evicted. 257 * @move: Callback for a driver to hook in accelerated functions to 258 * move a buffer. 259 * If set to NULL, a potentially slow memcpy() move is used. 260 * @sync_obj_signaled: See ttm_fence_api.h 261 * @sync_obj_wait: See ttm_fence_api.h 262 * @sync_obj_flush: See ttm_fence_api.h 263 * @sync_obj_unref: See ttm_fence_api.h 264 * @sync_obj_ref: See ttm_fence_api.h 265 */ 266 267struct ttm_bo_driver { 268 const uint32_t *mem_type_prio; 269 const uint32_t *mem_busy_prio; 270 uint32_t num_mem_type_prio; 271 uint32_t num_mem_busy_prio; 272 273 /** 274 * struct ttm_bo_driver member create_ttm_backend_entry 275 * 276 * @bdev: The buffer object device. 277 * 278 * Create a driver specific struct ttm_backend. 279 */ 280 281 struct ttm_backend *(*create_ttm_backend_entry) 282 (struct ttm_bo_device *bdev); 283 284 /** 285 * struct ttm_bo_driver member invalidate_caches 286 * 287 * @bdev: the buffer object device. 288 * @flags: new placement of the rebound buffer object. 289 * 290 * A previosly evicted buffer has been rebound in a 291 * potentially new location. Tell the driver that it might 292 * consider invalidating read (texture) caches on the next command 293 * submission as a consequence. 294 */ 295 296 int (*invalidate_caches) (struct ttm_bo_device *bdev, uint32_t flags); 297 int (*init_mem_type) (struct ttm_bo_device *bdev, uint32_t type, 298 struct ttm_mem_type_manager *man); 299 /** 300 * struct ttm_bo_driver member evict_flags: 301 * 302 * @bo: the buffer object to be evicted 303 * 304 * Return the bo flags for a buffer which is not mapped to the hardware. 305 * These will be placed in proposed_flags so that when the move is 306 * finished, they'll end up in bo->mem.flags 307 */ 308 309 uint32_t(*evict_flags) (struct ttm_buffer_object *bo); 310 /** 311 * struct ttm_bo_driver member move: 312 * 313 * @bo: the buffer to move 314 * @evict: whether this motion is evicting the buffer from 315 * the graphics address space 316 * @interruptible: Use interruptible sleeps if possible when sleeping. 317 * @no_wait: whether this should give up and return -EBUSY 318 * if this move would require sleeping 319 * @new_mem: the new memory region receiving the buffer 320 * 321 * Move a buffer between two memory regions. 322 */ 323 int (*move) (struct ttm_buffer_object *bo, 324 bool evict, bool interruptible, 325 bool no_wait, struct ttm_mem_reg *new_mem); 326 327 /** 328 * struct ttm_bo_driver_member verify_access 329 * 330 * @bo: Pointer to a buffer object. 331 * @filp: Pointer to a struct file trying to access the object. 332 * 333 * Called from the map / write / read methods to verify that the 334 * caller is permitted to access the buffer object. 335 * This member may be set to NULL, which will refuse this kind of 336 * access for all buffer objects. 337 * This function should return 0 if access is granted, -EPERM otherwise. 338 */ 339 int (*verify_access) (struct ttm_buffer_object *bo, 340 struct file *filp); 341 342 /** 343 * In case a driver writer dislikes the TTM fence objects, 344 * the driver writer can replace those with sync objects of 345 * his / her own. If it turns out that no driver writer is 346 * using these. I suggest we remove these hooks and plug in 347 * fences directly. The bo driver needs the following functionality: 348 * See the corresponding functions in the fence object API 349 * documentation. 350 */ 351 352 bool (*sync_obj_signaled) (void *sync_obj, void *sync_arg); 353 int (*sync_obj_wait) (void *sync_obj, void *sync_arg, 354 bool lazy, bool interruptible); 355 int (*sync_obj_flush) (void *sync_obj, void *sync_arg); 356 void (*sync_obj_unref) (void **sync_obj); 357 void *(*sync_obj_ref) (void *sync_obj); 358 359 /* hook to notify driver about a driver move so it 360 * can do tiling things */ 361 void (*move_notify)(struct ttm_buffer_object *bo, 362 struct ttm_mem_reg *new_mem); 363 /* notify the driver we are taking a fault on this BO 364 * and have reserved it */ 365 void (*fault_reserve_notify)(struct ttm_buffer_object *bo); 366}; 367 368/** 369 * struct ttm_bo_global_ref - Argument to initialize a struct ttm_bo_global. 370 */ 371 372struct ttm_bo_global_ref { 373 struct ttm_global_reference ref; 374 struct ttm_mem_global *mem_glob; 375}; 376 377/** 378 * struct ttm_bo_global - Buffer object driver global data. 379 * 380 * @mem_glob: Pointer to a struct ttm_mem_global object for accounting. 381 * @dummy_read_page: Pointer to a dummy page used for mapping requests 382 * of unpopulated pages. 383 * @shrink: A shrink callback object used for buffer object swap. 384 * @ttm_bo_extra_size: Extra size (sizeof(struct ttm_buffer_object) excluded) 385 * used by a buffer object. This is excluding page arrays and backing pages. 386 * @ttm_bo_size: This is @ttm_bo_extra_size + sizeof(struct ttm_buffer_object). 387 * @device_list_mutex: Mutex protecting the device list. 388 * This mutex is held while traversing the device list for pm options. 389 * @lru_lock: Spinlock protecting the bo subsystem lru lists. 390 * @device_list: List of buffer object devices. 391 * @swap_lru: Lru list of buffer objects used for swapping. 392 */ 393 394struct ttm_bo_global { 395 396 /** 397 * Constant after init. 398 */ 399 400 struct kobject kobj; 401 struct ttm_mem_global *mem_glob; 402 struct page *dummy_read_page; 403 struct ttm_mem_shrink shrink; 404 size_t ttm_bo_extra_size; 405 size_t ttm_bo_size; 406 struct mutex device_list_mutex; 407 spinlock_t lru_lock; 408 409 /** 410 * Protected by device_list_mutex. 411 */ 412 struct list_head device_list; 413 414 /** 415 * Protected by the lru_lock. 416 */ 417 struct list_head swap_lru; 418 419 /** 420 * Internal protection. 421 */ 422 atomic_t bo_count; 423}; 424 425 426#define TTM_NUM_MEM_TYPES 8 427 428#define TTM_BO_PRIV_FLAG_MOVING 0 /* Buffer object is moving and needs 429 idling before CPU mapping */ 430#define TTM_BO_PRIV_FLAG_MAX 1 431/** 432 * struct ttm_bo_device - Buffer object driver device-specific data. 433 * 434 * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver. 435 * @man: An array of mem_type_managers. 436 * @addr_space_mm: Range manager for the device address space. 437 * lru_lock: Spinlock that protects the buffer+device lru lists and 438 * ddestroy lists. 439 * @nice_mode: Try nicely to wait for buffer idle when cleaning a manager. 440 * If a GPU lockup has been detected, this is forced to 0. 441 * @dev_mapping: A pointer to the struct address_space representing the 442 * device address space. 443 * @wq: Work queue structure for the delayed delete workqueue. 444 * 445 */ 446 447struct ttm_bo_device { 448 449 /* 450 * Constant after bo device init / atomic. 451 */ 452 struct list_head device_list; 453 struct ttm_bo_global *glob; 454 struct ttm_bo_driver *driver; 455 rwlock_t vm_lock; 456 struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES]; 457 /* 458 * Protected by the vm lock. 459 */ 460 struct rb_root addr_space_rb; 461 struct drm_mm addr_space_mm; 462 463 /* 464 * Protected by the global:lru lock. 465 */ 466 struct list_head ddestroy; 467 468 /* 469 * Protected by load / firstopen / lastclose /unload sync. 470 */ 471 472 bool nice_mode; 473 struct address_space *dev_mapping; 474 475 /* 476 * Internal protection. 477 */ 478 479 struct delayed_work wq; 480 481 bool need_dma32; 482}; 483 484/** 485 * ttm_flag_masked 486 * 487 * @old: Pointer to the result and original value. 488 * @new: New value of bits. 489 * @mask: Mask of bits to change. 490 * 491 * Convenience function to change a number of bits identified by a mask. 492 */ 493 494static inline uint32_t 495ttm_flag_masked(uint32_t *old, uint32_t new, uint32_t mask) 496{ 497 *old ^= (*old ^ new) & mask; 498 return *old; 499} 500 501/** 502 * ttm_tt_create 503 * 504 * @bdev: pointer to a struct ttm_bo_device: 505 * @size: Size of the data needed backing. 506 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags. 507 * @dummy_read_page: See struct ttm_bo_device. 508 * 509 * Create a struct ttm_tt to back data with system memory pages. 510 * No pages are actually allocated. 511 * Returns: 512 * NULL: Out of memory. 513 */ 514extern struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, 515 unsigned long size, 516 uint32_t page_flags, 517 struct page *dummy_read_page); 518 519/** 520 * ttm_tt_set_user: 521 * 522 * @ttm: The struct ttm_tt to populate. 523 * @tsk: A struct task_struct for which @start is a valid user-space address. 524 * @start: A valid user-space address. 525 * @num_pages: Size in pages of the user memory area. 526 * 527 * Populate a struct ttm_tt with a user-space memory area after first pinning 528 * the pages backing it. 529 * Returns: 530 * !0: Error. 531 */ 532 533extern int ttm_tt_set_user(struct ttm_tt *ttm, 534 struct task_struct *tsk, 535 unsigned long start, unsigned long num_pages); 536 537/** 538 * ttm_ttm_bind: 539 * 540 * @ttm: The struct ttm_tt containing backing pages. 541 * @bo_mem: The struct ttm_mem_reg identifying the binding location. 542 * 543 * Bind the pages of @ttm to an aperture location identified by @bo_mem 544 */ 545extern int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem); 546 547/** 548 * ttm_ttm_destroy: 549 * 550 * @ttm: The struct ttm_tt. 551 * 552 * Unbind, unpopulate and destroy a struct ttm_tt. 553 */ 554extern void ttm_tt_destroy(struct ttm_tt *ttm); 555 556/** 557 * ttm_ttm_unbind: 558 * 559 * @ttm: The struct ttm_tt. 560 * 561 * Unbind a struct ttm_tt. 562 */ 563extern void ttm_tt_unbind(struct ttm_tt *ttm); 564 565/** 566 * ttm_ttm_destroy: 567 * 568 * @ttm: The struct ttm_tt. 569 * @index: Index of the desired page. 570 * 571 * Return a pointer to the struct page backing @ttm at page 572 * index @index. If the page is unpopulated, one will be allocated to 573 * populate that index. 574 * 575 * Returns: 576 * NULL on OOM. 577 */ 578extern struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index); 579 580/** 581 * ttm_tt_cache_flush: 582 * 583 * @pages: An array of pointers to struct page:s to flush. 584 * @num_pages: Number of pages to flush. 585 * 586 * Flush the data of the indicated pages from the cpu caches. 587 * This is used when changing caching attributes of the pages from 588 * cache-coherent. 589 */ 590extern void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages); 591 592/** 593 * ttm_tt_set_placement_caching: 594 * 595 * @ttm A struct ttm_tt the backing pages of which will change caching policy. 596 * @placement: Flag indicating the desired caching policy. 597 * 598 * This function will change caching policy of any default kernel mappings of 599 * the pages backing @ttm. If changing from cached to uncached or 600 * write-combined, 601 * all CPU caches will first be flushed to make sure the data of the pages 602 * hit RAM. This function may be very costly as it involves global TLB 603 * and cache flushes and potential page splitting / combining. 604 */ 605extern int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement); 606extern int ttm_tt_swapout(struct ttm_tt *ttm, 607 struct file *persistant_swap_storage); 608 609/* 610 * ttm_bo.c 611 */ 612 613/** 614 * ttm_mem_reg_is_pci 615 * 616 * @bdev: Pointer to a struct ttm_bo_device. 617 * @mem: A valid struct ttm_mem_reg. 618 * 619 * Returns true if the memory described by @mem is PCI memory, 620 * false otherwise. 621 */ 622extern bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, 623 struct ttm_mem_reg *mem); 624 625/** 626 * ttm_bo_mem_space 627 * 628 * @bo: Pointer to a struct ttm_buffer_object. the data of which 629 * we want to allocate space for. 630 * @proposed_placement: Proposed new placement for the buffer object. 631 * @mem: A struct ttm_mem_reg. 632 * @interruptible: Sleep interruptible when sliping. 633 * @no_wait: Don't sleep waiting for space to become available. 634 * 635 * Allocate memory space for the buffer object pointed to by @bo, using 636 * the placement flags in @mem, potentially evicting other idle buffer objects. 637 * This function may sleep while waiting for space to become available. 638 * Returns: 639 * -EBUSY: No space available (only if no_wait == 1). 640 * -ENOMEM: Could not allocate memory for the buffer object, either due to 641 * fragmentation or concurrent allocators. 642 * -ERESTART: An interruptible sleep was interrupted by a signal. 643 */ 644extern int ttm_bo_mem_space(struct ttm_buffer_object *bo, 645 uint32_t proposed_placement, 646 struct ttm_mem_reg *mem, 647 bool interruptible, bool no_wait); 648/** 649 * ttm_bo_wait_for_cpu 650 * 651 * @bo: Pointer to a struct ttm_buffer_object. 652 * @no_wait: Don't sleep while waiting. 653 * 654 * Wait until a buffer object is no longer sync'ed for CPU access. 655 * Returns: 656 * -EBUSY: Buffer object was sync'ed for CPU access. (only if no_wait == 1). 657 * -ERESTART: An interruptible sleep was interrupted by a signal. 658 */ 659 660extern int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait); 661 662/** 663 * ttm_bo_pci_offset - Get the PCI offset for the buffer object memory. 664 * 665 * @bo Pointer to a struct ttm_buffer_object. 666 * @bus_base On return the base of the PCI region 667 * @bus_offset On return the byte offset into the PCI region 668 * @bus_size On return the byte size of the buffer object or zero if 669 * the buffer object memory is not accessible through a PCI region. 670 * 671 * Returns: 672 * -EINVAL if the buffer object is currently not mappable. 673 * 0 otherwise. 674 */ 675 676extern int ttm_bo_pci_offset(struct ttm_bo_device *bdev, 677 struct ttm_mem_reg *mem, 678 unsigned long *bus_base, 679 unsigned long *bus_offset, 680 unsigned long *bus_size); 681 682extern void ttm_bo_global_release(struct ttm_global_reference *ref); 683extern int ttm_bo_global_init(struct ttm_global_reference *ref); 684 685extern int ttm_bo_device_release(struct ttm_bo_device *bdev); 686 687/** 688 * ttm_bo_device_init 689 * 690 * @bdev: A pointer to a struct ttm_bo_device to initialize. 691 * @mem_global: A pointer to an initialized struct ttm_mem_global. 692 * @driver: A pointer to a struct ttm_bo_driver set up by the caller. 693 * @file_page_offset: Offset into the device address space that is available 694 * for buffer data. This ensures compatibility with other users of the 695 * address space. 696 * 697 * Initializes a struct ttm_bo_device: 698 * Returns: 699 * !0: Failure. 700 */ 701extern int ttm_bo_device_init(struct ttm_bo_device *bdev, 702 struct ttm_bo_global *glob, 703 struct ttm_bo_driver *driver, 704 uint64_t file_page_offset, bool need_dma32); 705 706/** 707 * ttm_bo_unmap_virtual 708 * 709 * @bo: tear down the virtual mappings for this BO 710 */ 711extern void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo); 712 713/** 714 * ttm_bo_reserve: 715 * 716 * @bo: A pointer to a struct ttm_buffer_object. 717 * @interruptible: Sleep interruptible if waiting. 718 * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY. 719 * @use_sequence: If @bo is already reserved, Only sleep waiting for 720 * it to become unreserved if @sequence < (@bo)->sequence. 721 * 722 * Locks a buffer object for validation. (Or prevents other processes from 723 * locking it for validation) and removes it from lru lists, while taking 724 * a number of measures to prevent deadlocks. 725 * 726 * Deadlocks may occur when two processes try to reserve multiple buffers in 727 * different order, either by will or as a result of a buffer being evicted 728 * to make room for a buffer already reserved. (Buffers are reserved before 729 * they are evicted). The following algorithm prevents such deadlocks from 730 * occuring: 731 * 1) Buffers are reserved with the lru spinlock held. Upon successful 732 * reservation they are removed from the lru list. This stops a reserved buffer 733 * from being evicted. However the lru spinlock is released between the time 734 * a buffer is selected for eviction and the time it is reserved. 735 * Therefore a check is made when a buffer is reserved for eviction, that it 736 * is still the first buffer in the lru list, before it is removed from the 737 * list. @check_lru == 1 forces this check. If it fails, the function returns 738 * -EINVAL, and the caller should then choose a new buffer to evict and repeat 739 * the procedure. 740 * 2) Processes attempting to reserve multiple buffers other than for eviction, 741 * (typically execbuf), should first obtain a unique 32-bit 742 * validation sequence number, 743 * and call this function with @use_sequence == 1 and @sequence == the unique 744 * sequence number. If upon call of this function, the buffer object is already 745 * reserved, the validation sequence is checked against the validation 746 * sequence of the process currently reserving the buffer, 747 * and if the current validation sequence is greater than that of the process 748 * holding the reservation, the function returns -EAGAIN. Otherwise it sleeps 749 * waiting for the buffer to become unreserved, after which it retries 750 * reserving. 751 * The caller should, when receiving an -EAGAIN error 752 * release all its buffer reservations, wait for @bo to become unreserved, and 753 * then rerun the validation with the same validation sequence. This procedure 754 * will always guarantee that the process with the lowest validation sequence 755 * will eventually succeed, preventing both deadlocks and starvation. 756 * 757 * Returns: 758 * -EAGAIN: The reservation may cause a deadlock. 759 * Release all buffer reservations, wait for @bo to become unreserved and 760 * try again. (only if use_sequence == 1). 761 * -ERESTART: A wait for the buffer to become unreserved was interrupted by 762 * a signal. Release all buffer reservations and return to user-space. 763 */ 764extern int ttm_bo_reserve(struct ttm_buffer_object *bo, 765 bool interruptible, 766 bool no_wait, bool use_sequence, uint32_t sequence); 767 768/** 769 * ttm_bo_unreserve 770 * 771 * @bo: A pointer to a struct ttm_buffer_object. 772 * 773 * Unreserve a previous reservation of @bo. 774 */ 775extern void ttm_bo_unreserve(struct ttm_buffer_object *bo); 776 777/** 778 * ttm_bo_wait_unreserved 779 * 780 * @bo: A pointer to a struct ttm_buffer_object. 781 * 782 * Wait for a struct ttm_buffer_object to become unreserved. 783 * This is typically used in the execbuf code to relax cpu-usage when 784 * a potential deadlock condition backoff. 785 */ 786extern int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, 787 bool interruptible); 788 789/** 790 * ttm_bo_block_reservation 791 * 792 * @bo: A pointer to a struct ttm_buffer_object. 793 * @interruptible: Use interruptible sleep when waiting. 794 * @no_wait: Don't sleep, but rather return -EBUSY. 795 * 796 * Block reservation for validation by simply reserving the buffer. 797 * This is intended for single buffer use only without eviction, 798 * and thus needs no deadlock protection. 799 * 800 * Returns: 801 * -EBUSY: If no_wait == 1 and the buffer is already reserved. 802 * -ERESTART: If interruptible == 1 and the process received a signal 803 * while sleeping. 804 */ 805extern int ttm_bo_block_reservation(struct ttm_buffer_object *bo, 806 bool interruptible, bool no_wait); 807 808/** 809 * ttm_bo_unblock_reservation 810 * 811 * @bo: A pointer to a struct ttm_buffer_object. 812 * 813 * Unblocks reservation leaving lru lists untouched. 814 */ 815extern void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo); 816 817/* 818 * ttm_bo_util.c 819 */ 820 821/** 822 * ttm_bo_move_ttm 823 * 824 * @bo: A pointer to a struct ttm_buffer_object. 825 * @evict: 1: This is an eviction. Don't try to pipeline. 826 * @no_wait: Never sleep, but rather return with -EBUSY. 827 * @new_mem: struct ttm_mem_reg indicating where to move. 828 * 829 * Optimized move function for a buffer object with both old and 830 * new placement backed by a TTM. The function will, if successful, 831 * free any old aperture space, and set (@new_mem)->mm_node to NULL, 832 * and update the (@bo)->mem placement flags. If unsuccessful, the old 833 * data remains untouched, and it's up to the caller to free the 834 * memory space indicated by @new_mem. 835 * Returns: 836 * !0: Failure. 837 */ 838 839extern int ttm_bo_move_ttm(struct ttm_buffer_object *bo, 840 bool evict, bool no_wait, 841 struct ttm_mem_reg *new_mem); 842 843/** 844 * ttm_bo_move_memcpy 845 * 846 * @bo: A pointer to a struct ttm_buffer_object. 847 * @evict: 1: This is an eviction. Don't try to pipeline. 848 * @no_wait: Never sleep, but rather return with -EBUSY. 849 * @new_mem: struct ttm_mem_reg indicating where to move. 850 * 851 * Fallback move function for a mappable buffer object in mappable memory. 852 * The function will, if successful, 853 * free any old aperture space, and set (@new_mem)->mm_node to NULL, 854 * and update the (@bo)->mem placement flags. If unsuccessful, the old 855 * data remains untouched, and it's up to the caller to free the 856 * memory space indicated by @new_mem. 857 * Returns: 858 * !0: Failure. 859 */ 860 861extern int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, 862 bool evict, 863 bool no_wait, struct ttm_mem_reg *new_mem); 864 865/** 866 * ttm_bo_free_old_node 867 * 868 * @bo: A pointer to a struct ttm_buffer_object. 869 * 870 * Utility function to free an old placement after a successful move. 871 */ 872extern void ttm_bo_free_old_node(struct ttm_buffer_object *bo); 873 874/** 875 * ttm_bo_move_accel_cleanup. 876 * 877 * @bo: A pointer to a struct ttm_buffer_object. 878 * @sync_obj: A sync object that signals when moving is complete. 879 * @sync_obj_arg: An argument to pass to the sync object idle / wait 880 * functions. 881 * @evict: This is an evict move. Don't return until the buffer is idle. 882 * @no_wait: Never sleep, but rather return with -EBUSY. 883 * @new_mem: struct ttm_mem_reg indicating where to move. 884 * 885 * Accelerated move function to be called when an accelerated move 886 * has been scheduled. The function will create a new temporary buffer object 887 * representing the old placement, and put the sync object on both buffer 888 * objects. After that the newly created buffer object is unref'd to be 889 * destroyed when the move is complete. This will help pipeline 890 * buffer moves. 891 */ 892 893extern int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo, 894 void *sync_obj, 895 void *sync_obj_arg, 896 bool evict, bool no_wait, 897 struct ttm_mem_reg *new_mem); 898/** 899 * ttm_io_prot 900 * 901 * @c_state: Caching state. 902 * @tmp: Page protection flag for a normal, cached mapping. 903 * 904 * Utility function that returns the pgprot_t that should be used for 905 * setting up a PTE with the caching model indicated by @c_state. 906 */ 907extern pgprot_t ttm_io_prot(enum ttm_caching_state c_state, pgprot_t tmp); 908 909#if (defined(CONFIG_AGP) || (defined(CONFIG_AGP_MODULE) && defined(MODULE))) 910#define TTM_HAS_AGP 911#include <linux/agp_backend.h> 912 913/** 914 * ttm_agp_backend_init 915 * 916 * @bdev: Pointer to a struct ttm_bo_device. 917 * @bridge: The agp bridge this device is sitting on. 918 * 919 * Create a TTM backend that uses the indicated AGP bridge as an aperture 920 * for TT memory. This function uses the linux agpgart interface to 921 * bind and unbind memory backing a ttm_tt. 922 */ 923extern struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev, 924 struct agp_bridge_data *bridge); 925#endif 926 927#endif 928