?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
JBD: round commit timer up to avoid uncommitted transaction
[linux/fpc-iii.git] / drivers / gpu / drm / ttm / ttm_bo.c
blobc2b0d710d10f79e06fd21d19c1a061e615eff3ac
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 #include "ttm/ttm_module.h"
32 #include "ttm/ttm_bo_driver.h"
33 #include "ttm/ttm_placement.h"
34 #include <linux/jiffies.h>
35 #include <linux/slab.h>
36 #include <linux/sched.h>
37 #include <linux/mm.h>
38 #include <linux/file.h>
39 #include <linux/module.h>
40
41 #define TTM_ASSERT_LOCKED(param)
42 #define TTM_DEBUG(fmt, arg...)
43 #define TTM_BO_HASH_ORDER 13
44
45 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
46 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
47
48 static inline uint32_t ttm_bo_type_flags(unsigned type)
49 {
50 return 1 << (type);
51 }
52
53 static void ttm_bo_release_list(struct kref *list_kref)
54 {
55 struct ttm_buffer_object *bo =
56 container_of(list_kref, struct ttm_buffer_object, list_kref);
57 struct ttm_bo_device *bdev = bo->bdev;
58
59 BUG_ON(atomic_read(&bo->list_kref.refcount));
60 BUG_ON(atomic_read(&bo->kref.refcount));
61 BUG_ON(atomic_read(&bo->cpu_writers));
62 BUG_ON(bo->sync_obj != NULL);
63 BUG_ON(bo->mem.mm_node != NULL);
64 BUG_ON(!list_empty(&bo->lru));
65 BUG_ON(!list_empty(&bo->ddestroy));
66
67 if (bo->ttm)
68 ttm_tt_destroy(bo->ttm);
69 if (bo->destroy)
70 bo->destroy(bo);
71 else {
72 ttm_mem_global_free(bdev->mem_glob, bo->acc_size, false);
73 kfree(bo);
74 }
75 }
76
77 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
78 {
79
80 if (interruptible) {
81 int ret = 0;
82
83 ret = wait_event_interruptible(bo->event_queue,
84 atomic_read(&bo->reserved) == 0);
85 if (unlikely(ret != 0))
86 return -ERESTART;
87 } else {
88 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
89 }
90 return 0;
91 }
92
93 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
94 {
95 struct ttm_bo_device *bdev = bo->bdev;
96 struct ttm_mem_type_manager *man;
97
98 BUG_ON(!atomic_read(&bo->reserved));
99
100 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
101
102 BUG_ON(!list_empty(&bo->lru));
103
104 man = &bdev->man[bo->mem.mem_type];
105 list_add_tail(&bo->lru, &man->lru);
106 kref_get(&bo->list_kref);
107
108 if (bo->ttm != NULL) {
109 list_add_tail(&bo->swap, &bdev->swap_lru);
110 kref_get(&bo->list_kref);
111 }
112 }
113 }
114
115 /**
116 * Call with the lru_lock held.
117 */
118
119 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
120 {
121 int put_count = 0;
122
123 if (!list_empty(&bo->swap)) {
124 list_del_init(&bo->swap);
125 ++put_count;
126 }
127 if (!list_empty(&bo->lru)) {
128 list_del_init(&bo->lru);
129 ++put_count;
130 }
131
132 /*
133 * TODO: Add a driver hook to delete from
134 * driver-specific LRU's here.
135 */
136
137 return put_count;
138 }
139
140 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
141 bool interruptible,
142 bool no_wait, bool use_sequence, uint32_t sequence)
143 {
144 struct ttm_bo_device *bdev = bo->bdev;
145 int ret;
146
147 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
148 if (use_sequence && bo->seq_valid &&
149 (sequence - bo->val_seq < (1 << 31))) {
150 return -EAGAIN;
151 }
152
153 if (no_wait)
154 return -EBUSY;
155
156 spin_unlock(&bdev->lru_lock);
157 ret = ttm_bo_wait_unreserved(bo, interruptible);
158 spin_lock(&bdev->lru_lock);
159
160 if (unlikely(ret))
161 return ret;
162 }
163
164 if (use_sequence) {
165 bo->val_seq = sequence;
166 bo->seq_valid = true;
167 } else {
168 bo->seq_valid = false;
169 }
170
171 return 0;
172 }
173 EXPORT_SYMBOL(ttm_bo_reserve);
174
175 static void ttm_bo_ref_bug(struct kref *list_kref)
176 {
177 BUG();
178 }
179
180 int ttm_bo_reserve(struct ttm_buffer_object *bo,
181 bool interruptible,
182 bool no_wait, bool use_sequence, uint32_t sequence)
183 {
184 struct ttm_bo_device *bdev = bo->bdev;
185 int put_count = 0;
186 int ret;
187
188 spin_lock(&bdev->lru_lock);
189 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
190 sequence);
191 if (likely(ret == 0))
192 put_count = ttm_bo_del_from_lru(bo);
193 spin_unlock(&bdev->lru_lock);
194
195 while (put_count--)
196 kref_put(&bo->list_kref, ttm_bo_ref_bug);
197
198 return ret;
199 }
200
201 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
202 {
203 struct ttm_bo_device *bdev = bo->bdev;
204
205 spin_lock(&bdev->lru_lock);
206 ttm_bo_add_to_lru(bo);
207 atomic_set(&bo->reserved, 0);
208 wake_up_all(&bo->event_queue);
209 spin_unlock(&bdev->lru_lock);
210 }
211 EXPORT_SYMBOL(ttm_bo_unreserve);
212
213 /*
214 * Call bo->mutex locked.
215 */
216
217 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
218 {
219 struct ttm_bo_device *bdev = bo->bdev;
220 int ret = 0;
221 uint32_t page_flags = 0;
222
223 TTM_ASSERT_LOCKED(&bo->mutex);
224 bo->ttm = NULL;
225
226 if (bdev->need_dma32)
227 page_flags |= TTM_PAGE_FLAG_DMA32;
228
229 switch (bo->type) {
230 case ttm_bo_type_device:
231 if (zero_alloc)
232 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
233 case ttm_bo_type_kernel:
234 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
235 page_flags, bdev->dummy_read_page);
236 if (unlikely(bo->ttm == NULL))
237 ret = -ENOMEM;
238 break;
239 case ttm_bo_type_user:
240 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
241 page_flags | TTM_PAGE_FLAG_USER,
242 bdev->dummy_read_page);
243 if (unlikely(bo->ttm == NULL))
244 ret = -ENOMEM;
245 break;
246
247 ret = ttm_tt_set_user(bo->ttm, current,
248 bo->buffer_start, bo->num_pages);
249 if (unlikely(ret != 0))
250 ttm_tt_destroy(bo->ttm);
251 break;
252 default:
253 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
254 ret = -EINVAL;
255 break;
256 }
257
258 return ret;
259 }
260
261 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
262 struct ttm_mem_reg *mem,
263 bool evict, bool interruptible, bool no_wait)
264 {
265 struct ttm_bo_device *bdev = bo->bdev;
266 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
267 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
268 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
269 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
270 int ret = 0;
271
272 if (old_is_pci || new_is_pci ||
273 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
274 ttm_bo_unmap_virtual(bo);
275
276 /*
277 * Create and bind a ttm if required.
278 */
279
280 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
281 ret = ttm_bo_add_ttm(bo, false);
282 if (ret)
283 goto out_err;
284
285 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
286 if (ret)
287 goto out_err;
288
289 if (mem->mem_type != TTM_PL_SYSTEM) {
290 ret = ttm_tt_bind(bo->ttm, mem);
291 if (ret)
292 goto out_err;
293 }
294
295 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
296
297 struct ttm_mem_reg *old_mem = &bo->mem;
298 uint32_t save_flags = old_mem->placement;
299
300 *old_mem = *mem;
301 mem->mm_node = NULL;
302 ttm_flag_masked(&save_flags, mem->placement,
303 TTM_PL_MASK_MEMTYPE);
304 goto moved;
305 }
306
307 }
308
309 if (bdev->driver->move_notify)
310 bdev->driver->move_notify(bo, mem);
311
312 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
313 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
314 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
315 else if (bdev->driver->move)
316 ret = bdev->driver->move(bo, evict, interruptible,
317 no_wait, mem);
318 else
319 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
320
321 if (ret)
322 goto out_err;
323
324 moved:
325 if (bo->evicted) {
326 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
327 if (ret)
328 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
329 bo->evicted = false;
330 }
331
332 if (bo->mem.mm_node) {
333 spin_lock(&bo->lock);
334 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
335 bdev->man[bo->mem.mem_type].gpu_offset;
336 bo->cur_placement = bo->mem.placement;
337 spin_unlock(&bo->lock);
338 }
339
340 return 0;
341
342 out_err:
343 new_man = &bdev->man[bo->mem.mem_type];
344 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
345 ttm_tt_unbind(bo->ttm);
346 ttm_tt_destroy(bo->ttm);
347 bo->ttm = NULL;
348 }
349
350 return ret;
351 }
352
353 /**
354 * If bo idle, remove from delayed- and lru lists, and unref.
355 * If not idle, and already on delayed list, do nothing.
356 * If not idle, and not on delayed list, put on delayed list,
357 * up the list_kref and schedule a delayed list check.
358 */
359
360 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
361 {
362 struct ttm_bo_device *bdev = bo->bdev;
363 struct ttm_bo_driver *driver = bdev->driver;
364 int ret;
365
366 spin_lock(&bo->lock);
367 (void) ttm_bo_wait(bo, false, false, !remove_all);
368
369 if (!bo->sync_obj) {
370 int put_count;
371
372 spin_unlock(&bo->lock);
373
374 spin_lock(&bdev->lru_lock);
375 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
376 BUG_ON(ret);
377 if (bo->ttm)
378 ttm_tt_unbind(bo->ttm);
379
380 if (!list_empty(&bo->ddestroy)) {
381 list_del_init(&bo->ddestroy);
382 kref_put(&bo->list_kref, ttm_bo_ref_bug);
383 }
384 if (bo->mem.mm_node) {
385 drm_mm_put_block(bo->mem.mm_node);
386 bo->mem.mm_node = NULL;
387 }
388 put_count = ttm_bo_del_from_lru(bo);
389 spin_unlock(&bdev->lru_lock);
390
391 atomic_set(&bo->reserved, 0);
392
393 while (put_count--)
394 kref_put(&bo->list_kref, ttm_bo_release_list);
395
396 return 0;
397 }
398
399 spin_lock(&bdev->lru_lock);
400 if (list_empty(&bo->ddestroy)) {
401 void *sync_obj = bo->sync_obj;
402 void *sync_obj_arg = bo->sync_obj_arg;
403
404 kref_get(&bo->list_kref);
405 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
406 spin_unlock(&bdev->lru_lock);
407 spin_unlock(&bo->lock);
408
409 if (sync_obj)
410 driver->sync_obj_flush(sync_obj, sync_obj_arg);
411 schedule_delayed_work(&bdev->wq,
412 ((HZ / 100) < 1) ? 1 : HZ / 100);
413 ret = 0;
414
415 } else {
416 spin_unlock(&bdev->lru_lock);
417 spin_unlock(&bo->lock);
418 ret = -EBUSY;
419 }
420
421 return ret;
422 }
423
424 /**
425 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
426 * encountered buffers.
427 */
428
429 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
430 {
431 struct ttm_buffer_object *entry, *nentry;
432 struct list_head *list, *next;
433 int ret;
434
435 spin_lock(&bdev->lru_lock);
436 list_for_each_safe(list, next, &bdev->ddestroy) {
437 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
438 nentry = NULL;
439
440 /*
441 * Protect the next list entry from destruction while we
442 * unlock the lru_lock.
443 */
444
445 if (next != &bdev->ddestroy) {
446 nentry = list_entry(next, struct ttm_buffer_object,
447 ddestroy);
448 kref_get(&nentry->list_kref);
449 }
450 kref_get(&entry->list_kref);
451
452 spin_unlock(&bdev->lru_lock);
453 ret = ttm_bo_cleanup_refs(entry, remove_all);
454 kref_put(&entry->list_kref, ttm_bo_release_list);
455
456 spin_lock(&bdev->lru_lock);
457 if (nentry) {
458 bool next_onlist = !list_empty(next);
459 spin_unlock(&bdev->lru_lock);
460 kref_put(&nentry->list_kref, ttm_bo_release_list);
461 spin_lock(&bdev->lru_lock);
462 /*
463 * Someone might have raced us and removed the
464 * next entry from the list. We don't bother restarting
465 * list traversal.
466 */
467
468 if (!next_onlist)
469 break;
470 }
471 if (ret)
472 break;
473 }
474 ret = !list_empty(&bdev->ddestroy);
475 spin_unlock(&bdev->lru_lock);
476
477 return ret;
478 }
479
480 static void ttm_bo_delayed_workqueue(struct work_struct *work)
481 {
482 struct ttm_bo_device *bdev =
483 container_of(work, struct ttm_bo_device, wq.work);
484
485 if (ttm_bo_delayed_delete(bdev, false)) {
486 schedule_delayed_work(&bdev->wq,
487 ((HZ / 100) < 1) ? 1 : HZ / 100);
488 }
489 }
490
491 static void ttm_bo_release(struct kref *kref)
492 {
493 struct ttm_buffer_object *bo =
494 container_of(kref, struct ttm_buffer_object, kref);
495 struct ttm_bo_device *bdev = bo->bdev;
496
497 if (likely(bo->vm_node != NULL)) {
498 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
499 drm_mm_put_block(bo->vm_node);
500 bo->vm_node = NULL;
501 }
502 write_unlock(&bdev->vm_lock);
503 ttm_bo_cleanup_refs(bo, false);
504 kref_put(&bo->list_kref, ttm_bo_release_list);
505 write_lock(&bdev->vm_lock);
506 }
507
508 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
509 {
510 struct ttm_buffer_object *bo = *p_bo;
511 struct ttm_bo_device *bdev = bo->bdev;
512
513 *p_bo = NULL;
514 write_lock(&bdev->vm_lock);
515 kref_put(&bo->kref, ttm_bo_release);
516 write_unlock(&bdev->vm_lock);
517 }
518 EXPORT_SYMBOL(ttm_bo_unref);
519
520 static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
521 bool interruptible, bool no_wait)
522 {
523 int ret = 0;
524 struct ttm_bo_device *bdev = bo->bdev;
525 struct ttm_mem_reg evict_mem;
526 uint32_t proposed_placement;
527
528 if (bo->mem.mem_type != mem_type)
529 goto out;
530
531 spin_lock(&bo->lock);
532 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
533 spin_unlock(&bo->lock);
534
535 if (unlikely(ret != 0)) {
536 if (ret != -ERESTART) {
537 printk(KERN_ERR TTM_PFX
538 "Failed to expire sync object before "
539 "buffer eviction.\n");
540 }
541 goto out;
542 }
543
544 BUG_ON(!atomic_read(&bo->reserved));
545
546 evict_mem = bo->mem;
547 evict_mem.mm_node = NULL;
548
549 proposed_placement = bdev->driver->evict_flags(bo);
550
551 ret = ttm_bo_mem_space(bo, proposed_placement,
552 &evict_mem, interruptible, no_wait);
553 if (unlikely(ret != 0 && ret != -ERESTART))
554 ret = ttm_bo_mem_space(bo, TTM_PL_FLAG_SYSTEM,
555 &evict_mem, interruptible, no_wait);
556
557 if (ret) {
558 if (ret != -ERESTART)
559 printk(KERN_ERR TTM_PFX
560 "Failed to find memory space for "
561 "buffer 0x%p eviction.\n", bo);
562 goto out;
563 }
564
565 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
566 no_wait);
567 if (ret) {
568 if (ret != -ERESTART)
569 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
570 goto out;
571 }
572
573 spin_lock(&bdev->lru_lock);
574 if (evict_mem.mm_node) {
575 drm_mm_put_block(evict_mem.mm_node);
576 evict_mem.mm_node = NULL;
577 }
578 spin_unlock(&bdev->lru_lock);
579 bo->evicted = true;
580 out:
581 return ret;
582 }
583
584 /**
585 * Repeatedly evict memory from the LRU for @mem_type until we create enough
586 * space, or we've evicted everything and there isn't enough space.
587 */
588 static int ttm_bo_mem_force_space(struct ttm_bo_device *bdev,
589 struct ttm_mem_reg *mem,
590 uint32_t mem_type,
591 bool interruptible, bool no_wait)
592 {
593 struct drm_mm_node *node;
594 struct ttm_buffer_object *entry;
595 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
596 struct list_head *lru;
597 unsigned long num_pages = mem->num_pages;
598 int put_count = 0;
599 int ret;
600
601 retry_pre_get:
602 ret = drm_mm_pre_get(&man->manager);
603 if (unlikely(ret != 0))
604 return ret;
605
606 spin_lock(&bdev->lru_lock);
607 do {
608 node = drm_mm_search_free(&man->manager, num_pages,
609 mem->page_alignment, 1);
610 if (node)
611 break;
612
613 lru = &man->lru;
614 if (list_empty(lru))
615 break;
616
617 entry = list_first_entry(lru, struct ttm_buffer_object, lru);
618 kref_get(&entry->list_kref);
619
620 ret =
621 ttm_bo_reserve_locked(entry, interruptible, no_wait,
622 false, 0);
623
624 if (likely(ret == 0))
625 put_count = ttm_bo_del_from_lru(entry);
626
627 spin_unlock(&bdev->lru_lock);
628
629 if (unlikely(ret != 0))
630 return ret;
631
632 while (put_count--)
633 kref_put(&entry->list_kref, ttm_bo_ref_bug);
634
635 ret = ttm_bo_evict(entry, mem_type, interruptible, no_wait);
636
637 ttm_bo_unreserve(entry);
638
639 kref_put(&entry->list_kref, ttm_bo_release_list);
640 if (ret)
641 return ret;
642
643 spin_lock(&bdev->lru_lock);
644 } while (1);
645
646 if (!node) {
647 spin_unlock(&bdev->lru_lock);
648 return -ENOMEM;
649 }
650
651 node = drm_mm_get_block_atomic(node, num_pages, mem->page_alignment);
652 if (unlikely(!node)) {
653 spin_unlock(&bdev->lru_lock);
654 goto retry_pre_get;
655 }
656
657 spin_unlock(&bdev->lru_lock);
658 mem->mm_node = node;
659 mem->mem_type = mem_type;
660 return 0;
661 }
662
663 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
664 uint32_t cur_placement,
665 uint32_t proposed_placement)
666 {
667 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
668 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
669
670 /**
671 * Keep current caching if possible.
672 */
673
674 if ((cur_placement & caching) != 0)
675 result |= (cur_placement & caching);
676 else if ((man->default_caching & caching) != 0)
677 result |= man->default_caching;
678 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
679 result |= TTM_PL_FLAG_CACHED;
680 else if ((TTM_PL_FLAG_WC & caching) != 0)
681 result |= TTM_PL_FLAG_WC;
682 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
683 result |= TTM_PL_FLAG_UNCACHED;
684
685 return result;
686 }
687
688
689 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
690 bool disallow_fixed,
691 uint32_t mem_type,
692 uint32_t proposed_placement,
693 uint32_t *masked_placement)
694 {
695 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
696
697 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
698 return false;
699
700 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
701 return false;
702
703 if ((proposed_placement & man->available_caching) == 0)
704 return false;
705
706 cur_flags |= (proposed_placement & man->available_caching);
707
708 *masked_placement = cur_flags;
709 return true;
710 }
711
712 /**
713 * Creates space for memory region @mem according to its type.
714 *
715 * This function first searches for free space in compatible memory types in
716 * the priority order defined by the driver. If free space isn't found, then
717 * ttm_bo_mem_force_space is attempted in priority order to evict and find
718 * space.
719 */
720 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
721 uint32_t proposed_placement,
722 struct ttm_mem_reg *mem,
723 bool interruptible, bool no_wait)
724 {
725 struct ttm_bo_device *bdev = bo->bdev;
726 struct ttm_mem_type_manager *man;
727
728 uint32_t num_prios = bdev->driver->num_mem_type_prio;
729 const uint32_t *prios = bdev->driver->mem_type_prio;
730 uint32_t i;
731 uint32_t mem_type = TTM_PL_SYSTEM;
732 uint32_t cur_flags = 0;
733 bool type_found = false;
734 bool type_ok = false;
735 bool has_eagain = false;
736 struct drm_mm_node *node = NULL;
737 int ret;
738
739 mem->mm_node = NULL;
740 for (i = 0; i < num_prios; ++i) {
741 mem_type = prios[i];
742 man = &bdev->man[mem_type];
743
744 type_ok = ttm_bo_mt_compatible(man,
745 bo->type == ttm_bo_type_user,
746 mem_type, proposed_placement,
747 &cur_flags);
748
749 if (!type_ok)
750 continue;
751
752 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
753 cur_flags);
754
755 if (mem_type == TTM_PL_SYSTEM)
756 break;
757
758 if (man->has_type && man->use_type) {
759 type_found = true;
760 do {
761 ret = drm_mm_pre_get(&man->manager);
762 if (unlikely(ret))
763 return ret;
764
765 spin_lock(&bdev->lru_lock);
766 node = drm_mm_search_free(&man->manager,
767 mem->num_pages,
768 mem->page_alignment,
769 1);
770 if (unlikely(!node)) {
771 spin_unlock(&bdev->lru_lock);
772 break;
773 }
774 node = drm_mm_get_block_atomic(node,
775 mem->num_pages,
776 mem->
777 page_alignment);
778 spin_unlock(&bdev->lru_lock);
779 } while (!node);
780 }
781 if (node)
782 break;
783 }
784
785 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
786 mem->mm_node = node;
787 mem->mem_type = mem_type;
788 mem->placement = cur_flags;
789 return 0;
790 }
791
792 if (!type_found)
793 return -EINVAL;
794
795 num_prios = bdev->driver->num_mem_busy_prio;
796 prios = bdev->driver->mem_busy_prio;
797
798 for (i = 0; i < num_prios; ++i) {
799 mem_type = prios[i];
800 man = &bdev->man[mem_type];
801
802 if (!man->has_type)
803 continue;
804
805 if (!ttm_bo_mt_compatible(man,
806 bo->type == ttm_bo_type_user,
807 mem_type,
808 proposed_placement, &cur_flags))
809 continue;
810
811 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
812 cur_flags);
813
814 ret = ttm_bo_mem_force_space(bdev, mem, mem_type,
815 interruptible, no_wait);
816
817 if (ret == 0 && mem->mm_node) {
818 mem->placement = cur_flags;
819 return 0;
820 }
821
822 if (ret == -ERESTART)
823 has_eagain = true;
824 }
825
826 ret = (has_eagain) ? -ERESTART : -ENOMEM;
827 return ret;
828 }
829 EXPORT_SYMBOL(ttm_bo_mem_space);
830
831 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
832 {
833 int ret = 0;
834
835 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
836 return -EBUSY;
837
838 ret = wait_event_interruptible(bo->event_queue,
839 atomic_read(&bo->cpu_writers) == 0);
840
841 if (ret == -ERESTARTSYS)
842 ret = -ERESTART;
843
844 return ret;
845 }
846
847 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
848 uint32_t proposed_placement,
849 bool interruptible, bool no_wait)
850 {
851 struct ttm_bo_device *bdev = bo->bdev;
852 int ret = 0;
853 struct ttm_mem_reg mem;
854
855 BUG_ON(!atomic_read(&bo->reserved));
856
857 /*
858 * FIXME: It's possible to pipeline buffer moves.
859 * Have the driver move function wait for idle when necessary,
860 * instead of doing it here.
861 */
862
863 spin_lock(&bo->lock);
864 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
865 spin_unlock(&bo->lock);
866
867 if (ret)
868 return ret;
869
870 mem.num_pages = bo->num_pages;
871 mem.size = mem.num_pages << PAGE_SHIFT;
872 mem.page_alignment = bo->mem.page_alignment;
873
874 /*
875 * Determine where to move the buffer.
876 */
877
878 ret = ttm_bo_mem_space(bo, proposed_placement, &mem,
879 interruptible, no_wait);
880 if (ret)
881 goto out_unlock;
882
883 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
884
885 out_unlock:
886 if (ret && mem.mm_node) {
887 spin_lock(&bdev->lru_lock);
888 drm_mm_put_block(mem.mm_node);
889 spin_unlock(&bdev->lru_lock);
890 }
891 return ret;
892 }
893
894 static int ttm_bo_mem_compat(uint32_t proposed_placement,
895 struct ttm_mem_reg *mem)
896 {
897 if ((proposed_placement & mem->placement & TTM_PL_MASK_MEM) == 0)
898 return 0;
899 if ((proposed_placement & mem->placement & TTM_PL_MASK_CACHING) == 0)
900 return 0;
901
902 return 1;
903 }
904
905 int ttm_buffer_object_validate(struct ttm_buffer_object *bo,
906 uint32_t proposed_placement,
907 bool interruptible, bool no_wait)
908 {
909 int ret;
910
911 BUG_ON(!atomic_read(&bo->reserved));
912 bo->proposed_placement = proposed_placement;
913
914 TTM_DEBUG("Proposed placement 0x%08lx, Old flags 0x%08lx\n",
915 (unsigned long)proposed_placement,
916 (unsigned long)bo->mem.placement);
917
918 /*
919 * Check whether we need to move buffer.
920 */
921
922 if (!ttm_bo_mem_compat(bo->proposed_placement, &bo->mem)) {
923 ret = ttm_bo_move_buffer(bo, bo->proposed_placement,
924 interruptible, no_wait);
925 if (ret) {
926 if (ret != -ERESTART)
927 printk(KERN_ERR TTM_PFX
928 "Failed moving buffer. "
929 "Proposed placement 0x%08x\n",
930 bo->proposed_placement);
931 if (ret == -ENOMEM)
932 printk(KERN_ERR TTM_PFX
933 "Out of aperture space or "
934 "DRM memory quota.\n");
935 return ret;
936 }
937 }
938
939 /*
940 * We might need to add a TTM.
941 */
942
943 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
944 ret = ttm_bo_add_ttm(bo, true);
945 if (ret)
946 return ret;
947 }
948 /*
949 * Validation has succeeded, move the access and other
950 * non-mapping-related flag bits from the proposed flags to
951 * the active flags
952 */
953
954 ttm_flag_masked(&bo->mem.placement, bo->proposed_placement,
955 ~TTM_PL_MASK_MEMTYPE);
956
957 return 0;
958 }
959 EXPORT_SYMBOL(ttm_buffer_object_validate);
960
961 int
962 ttm_bo_check_placement(struct ttm_buffer_object *bo,
963 uint32_t set_flags, uint32_t clr_flags)
964 {
965 uint32_t new_mask = set_flags | clr_flags;
966
967 if ((bo->type == ttm_bo_type_user) &&
968 (clr_flags & TTM_PL_FLAG_CACHED)) {
969 printk(KERN_ERR TTM_PFX
970 "User buffers require cache-coherent memory.\n");
971 return -EINVAL;
972 }
973
974 if (!capable(CAP_SYS_ADMIN)) {
975 if (new_mask & TTM_PL_FLAG_NO_EVICT) {
976 printk(KERN_ERR TTM_PFX "Need to be root to modify"
977 " NO_EVICT status.\n");
978 return -EINVAL;
979 }
980
981 if ((clr_flags & bo->mem.placement & TTM_PL_MASK_MEMTYPE) &&
982 (bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
983 printk(KERN_ERR TTM_PFX
984 "Incompatible memory specification"
985 " for NO_EVICT buffer.\n");
986 return -EINVAL;
987 }
988 }
989 return 0;
990 }
991
992 int ttm_buffer_object_init(struct ttm_bo_device *bdev,
993 struct ttm_buffer_object *bo,
994 unsigned long size,
995 enum ttm_bo_type type,
996 uint32_t flags,
997 uint32_t page_alignment,
998 unsigned long buffer_start,
999 bool interruptible,
1000 struct file *persistant_swap_storage,
1001 size_t acc_size,
1002 void (*destroy) (struct ttm_buffer_object *))
1003 {
1004 int ret = 0;
1005 unsigned long num_pages;
1006
1007 size += buffer_start & ~PAGE_MASK;
1008 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1009 if (num_pages == 0) {
1010 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1011 return -EINVAL;
1012 }
1013 bo->destroy = destroy;
1014
1015 spin_lock_init(&bo->lock);
1016 kref_init(&bo->kref);
1017 kref_init(&bo->list_kref);
1018 atomic_set(&bo->cpu_writers, 0);
1019 atomic_set(&bo->reserved, 1);
1020 init_waitqueue_head(&bo->event_queue);
1021 INIT_LIST_HEAD(&bo->lru);
1022 INIT_LIST_HEAD(&bo->ddestroy);
1023 INIT_LIST_HEAD(&bo->swap);
1024 bo->bdev = bdev;
1025 bo->type = type;
1026 bo->num_pages = num_pages;
1027 bo->mem.mem_type = TTM_PL_SYSTEM;
1028 bo->mem.num_pages = bo->num_pages;
1029 bo->mem.mm_node = NULL;
1030 bo->mem.page_alignment = page_alignment;
1031 bo->buffer_start = buffer_start & PAGE_MASK;
1032 bo->priv_flags = 0;
1033 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1034 bo->seq_valid = false;
1035 bo->persistant_swap_storage = persistant_swap_storage;
1036 bo->acc_size = acc_size;
1037
1038 ret = ttm_bo_check_placement(bo, flags, 0ULL);
1039 if (unlikely(ret != 0))
1040 goto out_err;
1041
1042 /*
1043 * If no caching attributes are set, accept any form of caching.
1044 */
1045
1046 if ((flags & TTM_PL_MASK_CACHING) == 0)
1047 flags |= TTM_PL_MASK_CACHING;
1048
1049 /*
1050 * For ttm_bo_type_device buffers, allocate
1051 * address space from the device.
1052 */
1053
1054 if (bo->type == ttm_bo_type_device) {
1055 ret = ttm_bo_setup_vm(bo);
1056 if (ret)
1057 goto out_err;
1058 }
1059
1060 ret = ttm_buffer_object_validate(bo, flags, interruptible, false);
1061 if (ret)
1062 goto out_err;
1063
1064 ttm_bo_unreserve(bo);
1065 return 0;
1066
1067 out_err:
1068 ttm_bo_unreserve(bo);
1069 ttm_bo_unref(&bo);
1070
1071 return ret;
1072 }
1073 EXPORT_SYMBOL(ttm_buffer_object_init);
1074
1075 static inline size_t ttm_bo_size(struct ttm_bo_device *bdev,
1076 unsigned long num_pages)
1077 {
1078 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1079 PAGE_MASK;
1080
1081 return bdev->ttm_bo_size + 2 * page_array_size;
1082 }
1083
1084 int ttm_buffer_object_create(struct ttm_bo_device *bdev,
1085 unsigned long size,
1086 enum ttm_bo_type type,
1087 uint32_t flags,
1088 uint32_t page_alignment,
1089 unsigned long buffer_start,
1090 bool interruptible,
1091 struct file *persistant_swap_storage,
1092 struct ttm_buffer_object **p_bo)
1093 {
1094 struct ttm_buffer_object *bo;
1095 int ret;
1096 struct ttm_mem_global *mem_glob = bdev->mem_glob;
1097
1098 size_t acc_size =
1099 ttm_bo_size(bdev, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1100 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false, false);
1101 if (unlikely(ret != 0))
1102 return ret;
1103
1104 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1105
1106 if (unlikely(bo == NULL)) {
1107 ttm_mem_global_free(mem_glob, acc_size, false);
1108 return -ENOMEM;
1109 }
1110
1111 ret = ttm_buffer_object_init(bdev, bo, size, type, flags,
1112 page_alignment, buffer_start,
1113 interruptible,
1114 persistant_swap_storage, acc_size, NULL);
1115 if (likely(ret == 0))
1116 *p_bo = bo;
1117
1118 return ret;
1119 }
1120
1121 static int ttm_bo_leave_list(struct ttm_buffer_object *bo,
1122 uint32_t mem_type, bool allow_errors)
1123 {
1124 int ret;
1125
1126 spin_lock(&bo->lock);
1127 ret = ttm_bo_wait(bo, false, false, false);
1128 spin_unlock(&bo->lock);
1129
1130 if (ret && allow_errors)
1131 goto out;
1132
1133 if (bo->mem.mem_type == mem_type)
1134 ret = ttm_bo_evict(bo, mem_type, false, false);
1135
1136 if (ret) {
1137 if (allow_errors) {
1138 goto out;
1139 } else {
1140 ret = 0;
1141 printk(KERN_ERR TTM_PFX "Cleanup eviction failed\n");
1142 }
1143 }
1144
1145 out:
1146 return ret;
1147 }
1148
1149 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1150 struct list_head *head,
1151 unsigned mem_type, bool allow_errors)
1152 {
1153 struct ttm_buffer_object *entry;
1154 int ret;
1155 int put_count;
1156
1157 /*
1158 * Can't use standard list traversal since we're unlocking.
1159 */
1160
1161 spin_lock(&bdev->lru_lock);
1162
1163 while (!list_empty(head)) {
1164 entry = list_first_entry(head, struct ttm_buffer_object, lru);
1165 kref_get(&entry->list_kref);
1166 ret = ttm_bo_reserve_locked(entry, false, false, false, 0);
1167 put_count = ttm_bo_del_from_lru(entry);
1168 spin_unlock(&bdev->lru_lock);
1169 while (put_count--)
1170 kref_put(&entry->list_kref, ttm_bo_ref_bug);
1171 BUG_ON(ret);
1172 ret = ttm_bo_leave_list(entry, mem_type, allow_errors);
1173 ttm_bo_unreserve(entry);
1174 kref_put(&entry->list_kref, ttm_bo_release_list);
1175 spin_lock(&bdev->lru_lock);
1176 }
1177
1178 spin_unlock(&bdev->lru_lock);
1179
1180 return 0;
1181 }
1182
1183 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1184 {
1185 struct ttm_mem_type_manager *man;
1186 int ret = -EINVAL;
1187
1188 if (mem_type >= TTM_NUM_MEM_TYPES) {
1189 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1190 return ret;
1191 }
1192 man = &bdev->man[mem_type];
1193
1194 if (!man->has_type) {
1195 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1196 "memory manager type %u\n", mem_type);
1197 return ret;
1198 }
1199
1200 man->use_type = false;
1201 man->has_type = false;
1202
1203 ret = 0;
1204 if (mem_type > 0) {
1205 ttm_bo_force_list_clean(bdev, &man->lru, mem_type, false);
1206
1207 spin_lock(&bdev->lru_lock);
1208 if (drm_mm_clean(&man->manager))
1209 drm_mm_takedown(&man->manager);
1210 else
1211 ret = -EBUSY;
1212
1213 spin_unlock(&bdev->lru_lock);
1214 }
1215
1216 return ret;
1217 }
1218 EXPORT_SYMBOL(ttm_bo_clean_mm);
1219
1220 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1221 {
1222 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1223
1224 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1225 printk(KERN_ERR TTM_PFX
1226 "Illegal memory manager memory type %u.\n",
1227 mem_type);
1228 return -EINVAL;
1229 }
1230
1231 if (!man->has_type) {
1232 printk(KERN_ERR TTM_PFX
1233 "Memory type %u has not been initialized.\n",
1234 mem_type);
1235 return 0;
1236 }
1237
1238 return ttm_bo_force_list_clean(bdev, &man->lru, mem_type, true);
1239 }
1240 EXPORT_SYMBOL(ttm_bo_evict_mm);
1241
1242 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1243 unsigned long p_offset, unsigned long p_size)
1244 {
1245 int ret = -EINVAL;
1246 struct ttm_mem_type_manager *man;
1247
1248 if (type >= TTM_NUM_MEM_TYPES) {
1249 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1250 return ret;
1251 }
1252
1253 man = &bdev->man[type];
1254 if (man->has_type) {
1255 printk(KERN_ERR TTM_PFX
1256 "Memory manager already initialized for type %d\n",
1257 type);
1258 return ret;
1259 }
1260
1261 ret = bdev->driver->init_mem_type(bdev, type, man);
1262 if (ret)
1263 return ret;
1264
1265 ret = 0;
1266 if (type != TTM_PL_SYSTEM) {
1267 if (!p_size) {
1268 printk(KERN_ERR TTM_PFX
1269 "Zero size memory manager type %d\n",
1270 type);
1271 return ret;
1272 }
1273 ret = drm_mm_init(&man->manager, p_offset, p_size);
1274 if (ret)
1275 return ret;
1276 }
1277 man->has_type = true;
1278 man->use_type = true;
1279 man->size = p_size;
1280
1281 INIT_LIST_HEAD(&man->lru);
1282
1283 return 0;
1284 }
1285 EXPORT_SYMBOL(ttm_bo_init_mm);
1286
1287 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1288 {
1289 int ret = 0;
1290 unsigned i = TTM_NUM_MEM_TYPES;
1291 struct ttm_mem_type_manager *man;
1292
1293 while (i--) {
1294 man = &bdev->man[i];
1295 if (man->has_type) {
1296 man->use_type = false;
1297 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1298 ret = -EBUSY;
1299 printk(KERN_ERR TTM_PFX
1300 "DRM memory manager type %d "
1301 "is not clean.\n", i);
1302 }
1303 man->has_type = false;
1304 }
1305 }
1306
1307 if (!cancel_delayed_work(&bdev->wq))
1308 flush_scheduled_work();
1309
1310 while (ttm_bo_delayed_delete(bdev, true))
1311 ;
1312
1313 spin_lock(&bdev->lru_lock);
1314 if (list_empty(&bdev->ddestroy))
1315 TTM_DEBUG("Delayed destroy list was clean\n");
1316
1317 if (list_empty(&bdev->man[0].lru))
1318 TTM_DEBUG("Swap list was clean\n");
1319 spin_unlock(&bdev->lru_lock);
1320
1321 ttm_mem_unregister_shrink(bdev->mem_glob, &bdev->shrink);
1322 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1323 write_lock(&bdev->vm_lock);
1324 drm_mm_takedown(&bdev->addr_space_mm);
1325 write_unlock(&bdev->vm_lock);
1326
1327 __free_page(bdev->dummy_read_page);
1328 return ret;
1329 }
1330 EXPORT_SYMBOL(ttm_bo_device_release);
1331
1332 /*
1333 * This function is intended to be called on drm driver load.
1334 * If you decide to call it from firstopen, you must protect the call
1335 * from a potentially racing ttm_bo_driver_finish in lastclose.
1336 * (This may happen on X server restart).
1337 */
1338
1339 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1340 struct ttm_mem_global *mem_glob,
1341 struct ttm_bo_driver *driver, uint64_t file_page_offset,
1342 bool need_dma32)
1343 {
1344 int ret = -EINVAL;
1345
1346 bdev->dummy_read_page = NULL;
1347 rwlock_init(&bdev->vm_lock);
1348 spin_lock_init(&bdev->lru_lock);
1349
1350 bdev->driver = driver;
1351 bdev->mem_glob = mem_glob;
1352
1353 memset(bdev->man, 0, sizeof(bdev->man));
1354
1355 bdev->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1356 if (unlikely(bdev->dummy_read_page == NULL)) {
1357 ret = -ENOMEM;
1358 goto out_err0;
1359 }
1360
1361 /*
1362 * Initialize the system memory buffer type.
1363 * Other types need to be driver / IOCTL initialized.
1364 */
1365 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0, 0);
1366 if (unlikely(ret != 0))
1367 goto out_err1;
1368
1369 bdev->addr_space_rb = RB_ROOT;
1370 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1371 if (unlikely(ret != 0))
1372 goto out_err2;
1373
1374 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1375 bdev->nice_mode = true;
1376 INIT_LIST_HEAD(&bdev->ddestroy);
1377 INIT_LIST_HEAD(&bdev->swap_lru);
1378 bdev->dev_mapping = NULL;
1379 bdev->need_dma32 = need_dma32;
1380 ttm_mem_init_shrink(&bdev->shrink, ttm_bo_swapout);
1381 ret = ttm_mem_register_shrink(mem_glob, &bdev->shrink);
1382 if (unlikely(ret != 0)) {
1383 printk(KERN_ERR TTM_PFX
1384 "Could not register buffer object swapout.\n");
1385 goto out_err2;
1386 }
1387
1388 bdev->ttm_bo_extra_size =
1389 ttm_round_pot(sizeof(struct ttm_tt)) +
1390 ttm_round_pot(sizeof(struct ttm_backend));
1391
1392 bdev->ttm_bo_size = bdev->ttm_bo_extra_size +
1393 ttm_round_pot(sizeof(struct ttm_buffer_object));
1394
1395 return 0;
1396 out_err2:
1397 ttm_bo_clean_mm(bdev, 0);
1398 out_err1:
1399 __free_page(bdev->dummy_read_page);
1400 out_err0:
1401 return ret;
1402 }
1403 EXPORT_SYMBOL(ttm_bo_device_init);
1404
1405 /*
1406 * buffer object vm functions.
1407 */
1408
1409 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1410 {
1411 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1412
1413 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1414 if (mem->mem_type == TTM_PL_SYSTEM)
1415 return false;
1416
1417 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1418 return false;
1419
1420 if (mem->placement & TTM_PL_FLAG_CACHED)
1421 return false;
1422 }
1423 return true;
1424 }
1425
1426 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1427 struct ttm_mem_reg *mem,
1428 unsigned long *bus_base,
1429 unsigned long *bus_offset, unsigned long *bus_size)
1430 {
1431 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1432
1433 *bus_size = 0;
1434 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1435 return -EINVAL;
1436
1437 if (ttm_mem_reg_is_pci(bdev, mem)) {
1438 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1439 *bus_size = mem->num_pages << PAGE_SHIFT;
1440 *bus_base = man->io_offset;
1441 }
1442
1443 return 0;
1444 }
1445
1446 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1447 {
1448 struct ttm_bo_device *bdev = bo->bdev;
1449 loff_t offset = (loff_t) bo->addr_space_offset;
1450 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1451
1452 if (!bdev->dev_mapping)
1453 return;
1454
1455 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1456 }
1457 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1458
1459 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1460 {
1461 struct ttm_bo_device *bdev = bo->bdev;
1462 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1463 struct rb_node *parent = NULL;
1464 struct ttm_buffer_object *cur_bo;
1465 unsigned long offset = bo->vm_node->start;
1466 unsigned long cur_offset;
1467
1468 while (*cur) {
1469 parent = *cur;
1470 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1471 cur_offset = cur_bo->vm_node->start;
1472 if (offset < cur_offset)
1473 cur = &parent->rb_left;
1474 else if (offset > cur_offset)
1475 cur = &parent->rb_right;
1476 else
1477 BUG();
1478 }
1479
1480 rb_link_node(&bo->vm_rb, parent, cur);
1481 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1482 }
1483
1484 /**
1485 * ttm_bo_setup_vm:
1486 *
1487 * @bo: the buffer to allocate address space for
1488 *
1489 * Allocate address space in the drm device so that applications
1490 * can mmap the buffer and access the contents. This only
1491 * applies to ttm_bo_type_device objects as others are not
1492 * placed in the drm device address space.
1493 */
1494
1495 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1496 {
1497 struct ttm_bo_device *bdev = bo->bdev;
1498 int ret;
1499
1500 retry_pre_get:
1501 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1502 if (unlikely(ret != 0))
1503 return ret;
1504
1505 write_lock(&bdev->vm_lock);
1506 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1507 bo->mem.num_pages, 0, 0);
1508
1509 if (unlikely(bo->vm_node == NULL)) {
1510 ret = -ENOMEM;
1511 goto out_unlock;
1512 }
1513
1514 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1515 bo->mem.num_pages, 0);
1516
1517 if (unlikely(bo->vm_node == NULL)) {
1518 write_unlock(&bdev->vm_lock);
1519 goto retry_pre_get;
1520 }
1521
1522 ttm_bo_vm_insert_rb(bo);
1523 write_unlock(&bdev->vm_lock);
1524 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1525
1526 return 0;
1527 out_unlock:
1528 write_unlock(&bdev->vm_lock);
1529 return ret;
1530 }
1531
1532 int ttm_bo_wait(struct ttm_buffer_object *bo,
1533 bool lazy, bool interruptible, bool no_wait)
1534 {
1535 struct ttm_bo_driver *driver = bo->bdev->driver;
1536 void *sync_obj;
1537 void *sync_obj_arg;
1538 int ret = 0;
1539
1540 if (likely(bo->sync_obj == NULL))
1541 return 0;
1542
1543 while (bo->sync_obj) {
1544
1545 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1546 void *tmp_obj = bo->sync_obj;
1547 bo->sync_obj = NULL;
1548 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1549 spin_unlock(&bo->lock);
1550 driver->sync_obj_unref(&tmp_obj);
1551 spin_lock(&bo->lock);
1552 continue;
1553 }
1554
1555 if (no_wait)
1556 return -EBUSY;
1557
1558 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1559 sync_obj_arg = bo->sync_obj_arg;
1560 spin_unlock(&bo->lock);
1561 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1562 lazy, interruptible);
1563 if (unlikely(ret != 0)) {
1564 driver->sync_obj_unref(&sync_obj);
1565 spin_lock(&bo->lock);
1566 return ret;
1567 }
1568 spin_lock(&bo->lock);
1569 if (likely(bo->sync_obj == sync_obj &&
1570 bo->sync_obj_arg == sync_obj_arg)) {
1571 void *tmp_obj = bo->sync_obj;
1572 bo->sync_obj = NULL;
1573 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1574 &bo->priv_flags);
1575 spin_unlock(&bo->lock);
1576 driver->sync_obj_unref(&sync_obj);
1577 driver->sync_obj_unref(&tmp_obj);
1578 spin_lock(&bo->lock);
1579 } else {
1580 spin_unlock(&bo->lock);
1581 driver->sync_obj_unref(&sync_obj);
1582 spin_lock(&bo->lock);
1583 }
1584 }
1585 return 0;
1586 }
1587 EXPORT_SYMBOL(ttm_bo_wait);
1588
1589 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1590 {
1591 atomic_set(&bo->reserved, 0);
1592 wake_up_all(&bo->event_queue);
1593 }
1594
1595 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1596 bool no_wait)
1597 {
1598 int ret;
1599
1600 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1601 if (no_wait)
1602 return -EBUSY;
1603 else if (interruptible) {
1604 ret = wait_event_interruptible
1605 (bo->event_queue, atomic_read(&bo->reserved) == 0);
1606 if (unlikely(ret != 0))
1607 return -ERESTART;
1608 } else {
1609 wait_event(bo->event_queue,
1610 atomic_read(&bo->reserved) == 0);
1611 }
1612 }
1613 return 0;
1614 }
1615
1616 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1617 {
1618 int ret = 0;
1619
1620 /*
1621 * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1622 * makes sure the lru lists are updated.
1623 */
1624
1625 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1626 if (unlikely(ret != 0))
1627 return ret;
1628 spin_lock(&bo->lock);
1629 ret = ttm_bo_wait(bo, false, true, no_wait);
1630 spin_unlock(&bo->lock);
1631 if (likely(ret == 0))
1632 atomic_inc(&bo->cpu_writers);
1633 ttm_bo_unreserve(bo);
1634 return ret;
1635 }
1636
1637 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1638 {
1639 if (atomic_dec_and_test(&bo->cpu_writers))
1640 wake_up_all(&bo->event_queue);
1641 }
1642
1643 /**
1644 * A buffer object shrink method that tries to swap out the first
1645 * buffer object on the bo_global::swap_lru list.
1646 */
1647
1648 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1649 {
1650 struct ttm_bo_device *bdev =
1651 container_of(shrink, struct ttm_bo_device, shrink);
1652 struct ttm_buffer_object *bo;
1653 int ret = -EBUSY;
1654 int put_count;
1655 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1656
1657 spin_lock(&bdev->lru_lock);
1658 while (ret == -EBUSY) {
1659 if (unlikely(list_empty(&bdev->swap_lru))) {
1660 spin_unlock(&bdev->lru_lock);
1661 return -EBUSY;
1662 }
1663
1664 bo = list_first_entry(&bdev->swap_lru,
1665 struct ttm_buffer_object, swap);
1666 kref_get(&bo->list_kref);
1667
1668 /**
1669 * Reserve buffer. Since we unlock while sleeping, we need
1670 * to re-check that nobody removed us from the swap-list while
1671 * we slept.
1672 */
1673
1674 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1675 if (unlikely(ret == -EBUSY)) {
1676 spin_unlock(&bdev->lru_lock);
1677 ttm_bo_wait_unreserved(bo, false);
1678 kref_put(&bo->list_kref, ttm_bo_release_list);
1679 spin_lock(&bdev->lru_lock);
1680 }
1681 }
1682
1683 BUG_ON(ret != 0);
1684 put_count = ttm_bo_del_from_lru(bo);
1685 spin_unlock(&bdev->lru_lock);
1686
1687 while (put_count--)
1688 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1689
1690 /**
1691 * Wait for GPU, then move to system cached.
1692 */
1693
1694 spin_lock(&bo->lock);
1695 ret = ttm_bo_wait(bo, false, false, false);
1696 spin_unlock(&bo->lock);
1697
1698 if (unlikely(ret != 0))
1699 goto out;
1700
1701 if ((bo->mem.placement & swap_placement) != swap_placement) {
1702 struct ttm_mem_reg evict_mem;
1703
1704 evict_mem = bo->mem;
1705 evict_mem.mm_node = NULL;
1706 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1707 evict_mem.mem_type = TTM_PL_SYSTEM;
1708
1709 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1710 false, false);
1711 if (unlikely(ret != 0))
1712 goto out;
1713 }
1714
1715 ttm_bo_unmap_virtual(bo);
1716
1717 /**
1718 * Swap out. Buffer will be swapped in again as soon as
1719 * anyone tries to access a ttm page.
1720 */
1721
1722 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1723 out:
1724
1725 /**
1726 *
1727 * Unreserve without putting on LRU to avoid swapping out an
1728 * already swapped buffer.
1729 */
1730
1731 atomic_set(&bo->reserved, 0);
1732 wake_up_all(&bo->event_queue);
1733 kref_put(&bo->list_kref, ttm_bo_release_list);
1734 return ret;
1735 }
1736
1737 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1738 {
1739 while (ttm_bo_swapout(&bdev->shrink) == 0)
1740 ;
1741 }
Linux with added FPC-III support