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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_hashtab.h" | |
35 | #include <linux/kref.h> | |
36 | #include <linux/list.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/mutex.h> | |
39 | #include <linux/mm.h> | |
40 | #include <linux/rbtree.h> | |
41 | #include <linux/bitmap.h> | |
42 | ||
43 | struct ttm_bo_device; | |
44 | ||
45 | struct drm_mm_node; | |
46 | ||
ca262a99 JG |
47 | |
48 | /** | |
49 | * struct ttm_placement | |
50 | * | |
51 | * @fpfn: first valid page frame number to put the object | |
52 | * @lpfn: last valid page frame number to put the object | |
53 | * @num_placement: number of prefered placements | |
54 | * @placement: prefered placements | |
55 | * @num_busy_placement: number of prefered placements when need to evict buffer | |
56 | * @busy_placement: prefered placements when need to evict buffer | |
57 | * | |
58 | * Structure indicating the placement you request for an object. | |
59 | */ | |
60 | struct ttm_placement { | |
61 | unsigned fpfn; | |
62 | unsigned lpfn; | |
63 | unsigned num_placement; | |
64 | const uint32_t *placement; | |
65 | unsigned num_busy_placement; | |
66 | const uint32_t *busy_placement; | |
67 | }; | |
68 | ||
69 | ||
ba4e7d97 TH |
70 | /** |
71 | * struct ttm_mem_reg | |
72 | * | |
73 | * @mm_node: Memory manager node. | |
74 | * @size: Requested size of memory region. | |
75 | * @num_pages: Actual size of memory region in pages. | |
76 | * @page_alignment: Page alignment. | |
77 | * @placement: Placement flags. | |
78 | * | |
79 | * Structure indicating the placement and space resources used by a | |
80 | * buffer object. | |
81 | */ | |
82 | ||
83 | struct ttm_mem_reg { | |
84 | struct drm_mm_node *mm_node; | |
85 | unsigned long size; | |
86 | unsigned long num_pages; | |
87 | uint32_t page_alignment; | |
88 | uint32_t mem_type; | |
89 | uint32_t placement; | |
90 | }; | |
91 | ||
92 | /** | |
93 | * enum ttm_bo_type | |
94 | * | |
95 | * @ttm_bo_type_device: These are 'normal' buffers that can | |
96 | * be mmapped by user space. Each of these bos occupy a slot in the | |
97 | * device address space, that can be used for normal vm operations. | |
98 | * | |
99 | * @ttm_bo_type_user: These are user-space memory areas that are made | |
100 | * available to the GPU by mapping the buffer pages into the GPU aperture | |
101 | * space. These buffers cannot be mmaped from the device address space. | |
102 | * | |
103 | * @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers, | |
104 | * but they cannot be accessed from user-space. For kernel-only use. | |
105 | */ | |
106 | ||
107 | enum ttm_bo_type { | |
108 | ttm_bo_type_device, | |
109 | ttm_bo_type_user, | |
110 | ttm_bo_type_kernel | |
111 | }; | |
112 | ||
113 | struct ttm_tt; | |
114 | ||
115 | /** | |
116 | * struct ttm_buffer_object | |
117 | * | |
118 | * @bdev: Pointer to the buffer object device structure. | |
119 | * @buffer_start: The virtual user-space start address of ttm_bo_type_user | |
120 | * buffers. | |
121 | * @type: The bo type. | |
122 | * @destroy: Destruction function. If NULL, kfree is used. | |
123 | * @num_pages: Actual number of pages. | |
124 | * @addr_space_offset: Address space offset. | |
125 | * @acc_size: Accounted size for this object. | |
126 | * @kref: Reference count of this buffer object. When this refcount reaches | |
127 | * zero, the object is put on the delayed delete list. | |
128 | * @list_kref: List reference count of this buffer object. This member is | |
129 | * used to avoid destruction while the buffer object is still on a list. | |
130 | * Lru lists may keep one refcount, the delayed delete list, and kref != 0 | |
131 | * keeps one refcount. When this refcount reaches zero, | |
132 | * the object is destroyed. | |
133 | * @event_queue: Queue for processes waiting on buffer object status change. | |
134 | * @lock: spinlock protecting mostly synchronization members. | |
ba4e7d97 TH |
135 | * @mem: structure describing current placement. |
136 | * @persistant_swap_storage: Usually the swap storage is deleted for buffers | |
137 | * pinned in physical memory. If this behaviour is not desired, this member | |
138 | * holds a pointer to a persistant shmem object. | |
139 | * @ttm: TTM structure holding system pages. | |
140 | * @evicted: Whether the object was evicted without user-space knowing. | |
141 | * @cpu_writes: For synchronization. Number of cpu writers. | |
142 | * @lru: List head for the lru list. | |
143 | * @ddestroy: List head for the delayed destroy list. | |
144 | * @swap: List head for swap LRU list. | |
145 | * @val_seq: Sequence of the validation holding the @reserved lock. | |
146 | * Used to avoid starvation when many processes compete to validate the | |
147 | * buffer. This member is protected by the bo_device::lru_lock. | |
148 | * @seq_valid: The value of @val_seq is valid. This value is protected by | |
149 | * the bo_device::lru_lock. | |
150 | * @reserved: Deadlock-free lock used for synchronization state transitions. | |
151 | * @sync_obj_arg: Opaque argument to synchronization object function. | |
152 | * @sync_obj: Pointer to a synchronization object. | |
153 | * @priv_flags: Flags describing buffer object internal state. | |
154 | * @vm_rb: Rb node for the vm rb tree. | |
155 | * @vm_node: Address space manager node. | |
156 | * @offset: The current GPU offset, which can have different meanings | |
157 | * depending on the memory type. For SYSTEM type memory, it should be 0. | |
158 | * @cur_placement: Hint of current placement. | |
159 | * | |
160 | * Base class for TTM buffer object, that deals with data placement and CPU | |
161 | * mappings. GPU mappings are really up to the driver, but for simpler GPUs | |
162 | * the driver can usually use the placement offset @offset directly as the | |
163 | * GPU virtual address. For drivers implementing multiple | |
164 | * GPU memory manager contexts, the driver should manage the address space | |
165 | * in these contexts separately and use these objects to get the correct | |
166 | * placement and caching for these GPU maps. This makes it possible to use | |
167 | * these objects for even quite elaborate memory management schemes. | |
168 | * The destroy member, the API visibility of this object makes it possible | |
169 | * to derive driver specific types. | |
170 | */ | |
171 | ||
172 | struct ttm_buffer_object { | |
173 | /** | |
174 | * Members constant at init. | |
175 | */ | |
176 | ||
a987fcaa | 177 | struct ttm_bo_global *glob; |
ba4e7d97 TH |
178 | struct ttm_bo_device *bdev; |
179 | unsigned long buffer_start; | |
180 | enum ttm_bo_type type; | |
181 | void (*destroy) (struct ttm_buffer_object *); | |
182 | unsigned long num_pages; | |
183 | uint64_t addr_space_offset; | |
184 | size_t acc_size; | |
185 | ||
186 | /** | |
187 | * Members not needing protection. | |
188 | */ | |
189 | ||
190 | struct kref kref; | |
191 | struct kref list_kref; | |
192 | wait_queue_head_t event_queue; | |
193 | spinlock_t lock; | |
194 | ||
195 | /** | |
196 | * Members protected by the bo::reserved lock. | |
197 | */ | |
198 | ||
ba4e7d97 TH |
199 | struct ttm_mem_reg mem; |
200 | struct file *persistant_swap_storage; | |
201 | struct ttm_tt *ttm; | |
202 | bool evicted; | |
203 | ||
204 | /** | |
205 | * Members protected by the bo::reserved lock only when written to. | |
206 | */ | |
207 | ||
208 | atomic_t cpu_writers; | |
209 | ||
210 | /** | |
211 | * Members protected by the bdev::lru_lock. | |
212 | */ | |
213 | ||
214 | struct list_head lru; | |
215 | struct list_head ddestroy; | |
216 | struct list_head swap; | |
217 | uint32_t val_seq; | |
218 | bool seq_valid; | |
219 | ||
220 | /** | |
221 | * Members protected by the bdev::lru_lock | |
222 | * only when written to. | |
223 | */ | |
224 | ||
225 | atomic_t reserved; | |
226 | ||
227 | ||
228 | /** | |
229 | * Members protected by the bo::lock | |
230 | */ | |
231 | ||
232 | void *sync_obj_arg; | |
233 | void *sync_obj; | |
234 | unsigned long priv_flags; | |
235 | ||
236 | /** | |
237 | * Members protected by the bdev::vm_lock | |
238 | */ | |
239 | ||
240 | struct rb_node vm_rb; | |
241 | struct drm_mm_node *vm_node; | |
242 | ||
243 | ||
244 | /** | |
245 | * Special members that are protected by the reserve lock | |
246 | * and the bo::lock when written to. Can be read with | |
247 | * either of these locks held. | |
248 | */ | |
249 | ||
250 | unsigned long offset; | |
251 | uint32_t cur_placement; | |
252 | }; | |
253 | ||
254 | /** | |
255 | * struct ttm_bo_kmap_obj | |
256 | * | |
257 | * @virtual: The current kernel virtual address. | |
258 | * @page: The page when kmap'ing a single page. | |
259 | * @bo_kmap_type: Type of bo_kmap. | |
260 | * | |
261 | * Object describing a kernel mapping. Since a TTM bo may be located | |
262 | * in various memory types with various caching policies, the | |
263 | * mapping can either be an ioremap, a vmap, a kmap or part of a | |
264 | * premapped region. | |
265 | */ | |
266 | ||
a0724fcf | 267 | #define TTM_BO_MAP_IOMEM_MASK 0x80 |
ba4e7d97 TH |
268 | struct ttm_bo_kmap_obj { |
269 | void *virtual; | |
270 | struct page *page; | |
271 | enum { | |
a0724fcf PP |
272 | ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK, |
273 | ttm_bo_map_vmap = 2, | |
274 | ttm_bo_map_kmap = 3, | |
275 | ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK, | |
ba4e7d97 TH |
276 | } bo_kmap_type; |
277 | }; | |
278 | ||
279 | /** | |
280 | * ttm_bo_reference - reference a struct ttm_buffer_object | |
281 | * | |
282 | * @bo: The buffer object. | |
283 | * | |
284 | * Returns a refcounted pointer to a buffer object. | |
285 | */ | |
286 | ||
287 | static inline struct ttm_buffer_object * | |
288 | ttm_bo_reference(struct ttm_buffer_object *bo) | |
289 | { | |
290 | kref_get(&bo->kref); | |
291 | return bo; | |
292 | } | |
293 | ||
294 | /** | |
295 | * ttm_bo_wait - wait for buffer idle. | |
296 | * | |
297 | * @bo: The buffer object. | |
298 | * @interruptible: Use interruptible wait. | |
299 | * @no_wait: Return immediately if buffer is busy. | |
300 | * | |
301 | * This function must be called with the bo::mutex held, and makes | |
302 | * sure any previous rendering to the buffer is completed. | |
303 | * Note: It might be necessary to block validations before the | |
304 | * wait by reserving the buffer. | |
305 | * Returns -EBUSY if no_wait is true and the buffer is busy. | |
306 | * Returns -ERESTART if interrupted by a signal. | |
307 | */ | |
308 | extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy, | |
309 | bool interruptible, bool no_wait); | |
310 | /** | |
311 | * ttm_buffer_object_validate | |
312 | * | |
313 | * @bo: The buffer object. | |
ca262a99 | 314 | * @placement: Proposed placement for the buffer object. |
ba4e7d97 TH |
315 | * @interruptible: Sleep interruptible if sleeping. |
316 | * @no_wait: Return immediately if the buffer is busy. | |
317 | * | |
318 | * Changes placement and caching policy of the buffer object | |
ca262a99 | 319 | * according proposed placement. |
ba4e7d97 | 320 | * Returns |
ca262a99 | 321 | * -EINVAL on invalid proposed placement. |
ba4e7d97 TH |
322 | * -ENOMEM on out-of-memory condition. |
323 | * -EBUSY if no_wait is true and buffer busy. | |
324 | * -ERESTART if interrupted by a signal. | |
325 | */ | |
326 | extern int ttm_buffer_object_validate(struct ttm_buffer_object *bo, | |
ca262a99 JG |
327 | struct ttm_placement *placement, |
328 | bool interruptible, bool no_wait); | |
329 | ||
ba4e7d97 TH |
330 | /** |
331 | * ttm_bo_unref | |
332 | * | |
333 | * @bo: The buffer object. | |
334 | * | |
335 | * Unreference and clear a pointer to a buffer object. | |
336 | */ | |
337 | extern void ttm_bo_unref(struct ttm_buffer_object **bo); | |
338 | ||
339 | /** | |
340 | * ttm_bo_synccpu_write_grab | |
341 | * | |
342 | * @bo: The buffer object: | |
343 | * @no_wait: Return immediately if buffer is busy. | |
344 | * | |
345 | * Synchronizes a buffer object for CPU RW access. This means | |
346 | * blocking command submission that affects the buffer and | |
347 | * waiting for buffer idle. This lock is recursive. | |
348 | * Returns | |
349 | * -EBUSY if the buffer is busy and no_wait is true. | |
350 | * -ERESTART if interrupted by a signal. | |
351 | */ | |
352 | ||
353 | extern int | |
354 | ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait); | |
355 | /** | |
356 | * ttm_bo_synccpu_write_release: | |
357 | * | |
358 | * @bo : The buffer object. | |
359 | * | |
360 | * Releases a synccpu lock. | |
361 | */ | |
362 | extern void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo); | |
363 | ||
364 | /** | |
365 | * ttm_buffer_object_init | |
366 | * | |
367 | * @bdev: Pointer to a ttm_bo_device struct. | |
368 | * @bo: Pointer to a ttm_buffer_object to be initialized. | |
369 | * @size: Requested size of buffer object. | |
370 | * @type: Requested type of buffer object. | |
371 | * @flags: Initial placement flags. | |
372 | * @page_alignment: Data alignment in pages. | |
373 | * @buffer_start: Virtual address of user space data backing a | |
374 | * user buffer object. | |
375 | * @interruptible: If needing to sleep to wait for GPU resources, | |
376 | * sleep interruptible. | |
377 | * @persistant_swap_storage: Usually the swap storage is deleted for buffers | |
378 | * pinned in physical memory. If this behaviour is not desired, this member | |
379 | * holds a pointer to a persistant shmem object. Typically, this would | |
380 | * point to the shmem object backing a GEM object if TTM is used to back a | |
381 | * GEM user interface. | |
382 | * @acc_size: Accounted size for this object. | |
383 | * @destroy: Destroy function. Use NULL for kfree(). | |
384 | * | |
385 | * This function initializes a pre-allocated struct ttm_buffer_object. | |
386 | * As this object may be part of a larger structure, this function, | |
387 | * together with the @destroy function, | |
388 | * enables driver-specific objects derived from a ttm_buffer_object. | |
389 | * On successful return, the object kref and list_kref are set to 1. | |
390 | * Returns | |
391 | * -ENOMEM: Out of memory. | |
392 | * -EINVAL: Invalid placement flags. | |
393 | * -ERESTART: Interrupted by signal while sleeping waiting for resources. | |
394 | */ | |
395 | ||
396 | extern int ttm_buffer_object_init(struct ttm_bo_device *bdev, | |
397 | struct ttm_buffer_object *bo, | |
398 | unsigned long size, | |
399 | enum ttm_bo_type type, | |
400 | uint32_t flags, | |
401 | uint32_t page_alignment, | |
402 | unsigned long buffer_start, | |
403 | bool interrubtible, | |
404 | struct file *persistant_swap_storage, | |
405 | size_t acc_size, | |
406 | void (*destroy) (struct ttm_buffer_object *)); | |
407 | /** | |
408 | * ttm_bo_synccpu_object_init | |
409 | * | |
410 | * @bdev: Pointer to a ttm_bo_device struct. | |
411 | * @bo: Pointer to a ttm_buffer_object to be initialized. | |
412 | * @size: Requested size of buffer object. | |
413 | * @type: Requested type of buffer object. | |
414 | * @flags: Initial placement flags. | |
415 | * @page_alignment: Data alignment in pages. | |
416 | * @buffer_start: Virtual address of user space data backing a | |
417 | * user buffer object. | |
418 | * @interruptible: If needing to sleep while waiting for GPU resources, | |
419 | * sleep interruptible. | |
420 | * @persistant_swap_storage: Usually the swap storage is deleted for buffers | |
421 | * pinned in physical memory. If this behaviour is not desired, this member | |
422 | * holds a pointer to a persistant shmem object. Typically, this would | |
423 | * point to the shmem object backing a GEM object if TTM is used to back a | |
424 | * GEM user interface. | |
425 | * @p_bo: On successful completion *p_bo points to the created object. | |
426 | * | |
427 | * This function allocates a ttm_buffer_object, and then calls | |
428 | * ttm_buffer_object_init on that object. | |
429 | * The destroy function is set to kfree(). | |
430 | * Returns | |
431 | * -ENOMEM: Out of memory. | |
432 | * -EINVAL: Invalid placement flags. | |
433 | * -ERESTART: Interrupted by signal while waiting for resources. | |
434 | */ | |
435 | ||
436 | extern int ttm_buffer_object_create(struct ttm_bo_device *bdev, | |
437 | unsigned long size, | |
438 | enum ttm_bo_type type, | |
439 | uint32_t flags, | |
440 | uint32_t page_alignment, | |
441 | unsigned long buffer_start, | |
442 | bool interruptible, | |
443 | struct file *persistant_swap_storage, | |
444 | struct ttm_buffer_object **p_bo); | |
445 | ||
446 | /** | |
447 | * ttm_bo_check_placement | |
448 | * | |
449 | * @bo: the buffer object. | |
450 | * @set_flags: placement flags to set. | |
451 | * @clr_flags: placement flags to clear. | |
452 | * | |
453 | * Performs minimal validity checking on an intended change of | |
454 | * placement flags. | |
455 | * Returns | |
456 | * -EINVAL: Intended change is invalid or not allowed. | |
457 | */ | |
458 | ||
459 | extern int ttm_bo_check_placement(struct ttm_buffer_object *bo, | |
460 | uint32_t set_flags, uint32_t clr_flags); | |
461 | ||
462 | /** | |
463 | * ttm_bo_init_mm | |
464 | * | |
465 | * @bdev: Pointer to a ttm_bo_device struct. | |
466 | * @mem_type: The memory type. | |
ba4e7d97 TH |
467 | * @p_size: size managed area in pages. |
468 | * | |
469 | * Initialize a manager for a given memory type. | |
470 | * Note: if part of driver firstopen, it must be protected from a | |
471 | * potentially racing lastclose. | |
472 | * Returns: | |
473 | * -EINVAL: invalid size or memory type. | |
474 | * -ENOMEM: Not enough memory. | |
475 | * May also return driver-specified errors. | |
476 | */ | |
477 | ||
478 | extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type, | |
ca262a99 | 479 | unsigned long p_size); |
ba4e7d97 TH |
480 | /** |
481 | * ttm_bo_clean_mm | |
482 | * | |
483 | * @bdev: Pointer to a ttm_bo_device struct. | |
484 | * @mem_type: The memory type. | |
485 | * | |
486 | * Take down a manager for a given memory type after first walking | |
487 | * the LRU list to evict any buffers left alive. | |
488 | * | |
489 | * Normally, this function is part of lastclose() or unload(), and at that | |
490 | * point there shouldn't be any buffers left created by user-space, since | |
491 | * there should've been removed by the file descriptor release() method. | |
492 | * However, before this function is run, make sure to signal all sync objects, | |
493 | * and verify that the delayed delete queue is empty. The driver must also | |
494 | * make sure that there are no NO_EVICT buffers present in this memory type | |
495 | * when the call is made. | |
496 | * | |
497 | * If this function is part of a VT switch, the caller must make sure that | |
498 | * there are no appications currently validating buffers before this | |
499 | * function is called. The caller can do that by first taking the | |
500 | * struct ttm_bo_device::ttm_lock in write mode. | |
501 | * | |
502 | * Returns: | |
503 | * -EINVAL: invalid or uninitialized memory type. | |
504 | * -EBUSY: There are still buffers left in this memory type. | |
505 | */ | |
506 | ||
507 | extern int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type); | |
508 | ||
509 | /** | |
510 | * ttm_bo_evict_mm | |
511 | * | |
512 | * @bdev: Pointer to a ttm_bo_device struct. | |
513 | * @mem_type: The memory type. | |
514 | * | |
515 | * Evicts all buffers on the lru list of the memory type. | |
516 | * This is normally part of a VT switch or an | |
517 | * out-of-memory-space-due-to-fragmentation handler. | |
518 | * The caller must make sure that there are no other processes | |
519 | * currently validating buffers, and can do that by taking the | |
520 | * struct ttm_bo_device::ttm_lock in write mode. | |
521 | * | |
522 | * Returns: | |
523 | * -EINVAL: Invalid or uninitialized memory type. | |
524 | * -ERESTART: The call was interrupted by a signal while waiting to | |
525 | * evict a buffer. | |
526 | */ | |
527 | ||
528 | extern int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type); | |
529 | ||
530 | /** | |
531 | * ttm_kmap_obj_virtual | |
532 | * | |
533 | * @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap. | |
534 | * @is_iomem: Pointer to an integer that on return indicates 1 if the | |
535 | * virtual map is io memory, 0 if normal memory. | |
536 | * | |
537 | * Returns the virtual address of a buffer object area mapped by ttm_bo_kmap. | |
538 | * If *is_iomem is 1 on return, the virtual address points to an io memory area, | |
539 | * that should strictly be accessed by the iowriteXX() and similar functions. | |
540 | */ | |
541 | ||
542 | static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map, | |
543 | bool *is_iomem) | |
544 | { | |
a0724fcf | 545 | *is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK); |
ba4e7d97 TH |
546 | return map->virtual; |
547 | } | |
548 | ||
549 | /** | |
550 | * ttm_bo_kmap | |
551 | * | |
552 | * @bo: The buffer object. | |
553 | * @start_page: The first page to map. | |
554 | * @num_pages: Number of pages to map. | |
555 | * @map: pointer to a struct ttm_bo_kmap_obj representing the map. | |
556 | * | |
557 | * Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the | |
558 | * data in the buffer object. The ttm_kmap_obj_virtual function can then be | |
559 | * used to obtain a virtual address to the data. | |
560 | * | |
561 | * Returns | |
562 | * -ENOMEM: Out of memory. | |
563 | * -EINVAL: Invalid range. | |
564 | */ | |
565 | ||
566 | extern int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page, | |
567 | unsigned long num_pages, struct ttm_bo_kmap_obj *map); | |
568 | ||
569 | /** | |
570 | * ttm_bo_kunmap | |
571 | * | |
572 | * @map: Object describing the map to unmap. | |
573 | * | |
574 | * Unmaps a kernel map set up by ttm_bo_kmap. | |
575 | */ | |
576 | ||
577 | extern void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map); | |
578 | ||
579 | #if 0 | |
580 | #endif | |
581 | ||
582 | /** | |
583 | * ttm_fbdev_mmap - mmap fbdev memory backed by a ttm buffer object. | |
584 | * | |
585 | * @vma: vma as input from the fbdev mmap method. | |
586 | * @bo: The bo backing the address space. The address space will | |
587 | * have the same size as the bo, and start at offset 0. | |
588 | * | |
589 | * This function is intended to be called by the fbdev mmap method | |
590 | * if the fbdev address space is to be backed by a bo. | |
591 | */ | |
592 | ||
593 | extern int ttm_fbdev_mmap(struct vm_area_struct *vma, | |
594 | struct ttm_buffer_object *bo); | |
595 | ||
596 | /** | |
597 | * ttm_bo_mmap - mmap out of the ttm device address space. | |
598 | * | |
599 | * @filp: filp as input from the mmap method. | |
600 | * @vma: vma as input from the mmap method. | |
601 | * @bdev: Pointer to the ttm_bo_device with the address space manager. | |
602 | * | |
603 | * This function is intended to be called by the device mmap method. | |
604 | * if the device address space is to be backed by the bo manager. | |
605 | */ | |
606 | ||
607 | extern int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, | |
608 | struct ttm_bo_device *bdev); | |
609 | ||
610 | /** | |
611 | * ttm_bo_io | |
612 | * | |
613 | * @bdev: Pointer to the struct ttm_bo_device. | |
614 | * @filp: Pointer to the struct file attempting to read / write. | |
615 | * @wbuf: User-space pointer to address of buffer to write. NULL on read. | |
616 | * @rbuf: User-space pointer to address of buffer to read into. | |
617 | * Null on write. | |
618 | * @count: Number of bytes to read / write. | |
619 | * @f_pos: Pointer to current file position. | |
620 | * @write: 1 for read, 0 for write. | |
621 | * | |
622 | * This function implements read / write into ttm buffer objects, and is | |
623 | * intended to | |
624 | * be called from the fops::read and fops::write method. | |
625 | * Returns: | |
626 | * See man (2) write, man(2) read. In particular, | |
627 | * the function may return -EINTR if | |
628 | * interrupted by a signal. | |
629 | */ | |
630 | ||
631 | extern ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp, | |
632 | const char __user *wbuf, char __user *rbuf, | |
633 | size_t count, loff_t *f_pos, bool write); | |
634 | ||
635 | extern void ttm_bo_swapout_all(struct ttm_bo_device *bdev); | |
636 | ||
637 | #endif |