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drm/ttm: Add a swap_notify callback.
[linux-2.6/libata-dev.git] / drivers / gpu / drm / ttm / ttm_bo.c
blobe10a04e7c4e950a96ffd2c8a8e0463e679d77071
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 /* Notes:
31 *
32 * We store bo pointer in drm_mm_node struct so we know which bo own a
33 * specific node. There is no protection on the pointer, thus to make
34 * sure things don't go berserk you have to access this pointer while
35 * holding the global lru lock and make sure anytime you free a node you
36 * reset the pointer to NULL.
37 */
38
39 #include "ttm/ttm_module.h"
40 #include "ttm/ttm_bo_driver.h"
41 #include "ttm/ttm_placement.h"
42 #include <linux/jiffies.h>
43 #include <linux/slab.h>
44 #include <linux/sched.h>
45 #include <linux/mm.h>
46 #include <linux/file.h>
47 #include <linux/module.h>
48
49 #define TTM_ASSERT_LOCKED(param)
50 #define TTM_DEBUG(fmt, arg...)
51 #define TTM_BO_HASH_ORDER 13
52
53 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
54 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
55 static void ttm_bo_global_kobj_release(struct kobject *kobj);
56
57 static struct attribute ttm_bo_count = {
58 .name = "bo_count",
59 .mode = S_IRUGO
60 };
61
62 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
63 {
64 int i;
65
66 for (i = 0; i <= TTM_PL_PRIV5; i++)
67 if (flags & (1 << i)) {
68 *mem_type = i;
69 return 0;
70 }
71 return -EINVAL;
72 }
73
74 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
75 {
76 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
77
78 printk(KERN_ERR TTM_PFX " has_type: %d\n", man->has_type);
79 printk(KERN_ERR TTM_PFX " use_type: %d\n", man->use_type);
80 printk(KERN_ERR TTM_PFX " flags: 0x%08X\n", man->flags);
81 printk(KERN_ERR TTM_PFX " gpu_offset: 0x%08lX\n", man->gpu_offset);
82 printk(KERN_ERR TTM_PFX " io_offset: 0x%08lX\n", man->io_offset);
83 printk(KERN_ERR TTM_PFX " io_size: %ld\n", man->io_size);
84 printk(KERN_ERR TTM_PFX " size: %llu\n", man->size);
85 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
86 man->available_caching);
87 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
88 man->default_caching);
89 if (mem_type != TTM_PL_SYSTEM) {
90 spin_lock(&bdev->glob->lru_lock);
91 drm_mm_debug_table(&man->manager, TTM_PFX);
92 spin_unlock(&bdev->glob->lru_lock);
93 }
94 }
95
96 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
97 struct ttm_placement *placement)
98 {
99 int i, ret, mem_type;
100
101 printk(KERN_ERR TTM_PFX "No space for %p (%lu pages, %luK, %luM)\n",
102 bo, bo->mem.num_pages, bo->mem.size >> 10,
103 bo->mem.size >> 20);
104 for (i = 0; i < placement->num_placement; i++) {
105 ret = ttm_mem_type_from_flags(placement->placement[i],
106 &mem_type);
107 if (ret)
108 return;
109 printk(KERN_ERR TTM_PFX " placement[%d]=0x%08X (%d)\n",
110 i, placement->placement[i], mem_type);
111 ttm_mem_type_debug(bo->bdev, mem_type);
112 }
113 }
114
115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
116 struct attribute *attr,
117 char *buffer)
118 {
119 struct ttm_bo_global *glob =
120 container_of(kobj, struct ttm_bo_global, kobj);
121
122 return snprintf(buffer, PAGE_SIZE, "%lu\n",
123 (unsigned long) atomic_read(&glob->bo_count));
124 }
125
126 static struct attribute *ttm_bo_global_attrs[] = {
127 &ttm_bo_count,
128 NULL
129 };
130
131 static struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
133 };
134
135 static struct kobj_type ttm_bo_glob_kobj_type = {
136 .release = &ttm_bo_global_kobj_release,
137 .sysfs_ops = &ttm_bo_global_ops,
138 .default_attrs = ttm_bo_global_attrs
139 };
140
141
142 static inline uint32_t ttm_bo_type_flags(unsigned type)
143 {
144 return 1 << (type);
145 }
146
147 static void ttm_bo_release_list(struct kref *list_kref)
148 {
149 struct ttm_buffer_object *bo =
150 container_of(list_kref, struct ttm_buffer_object, list_kref);
151 struct ttm_bo_device *bdev = bo->bdev;
152
153 BUG_ON(atomic_read(&bo->list_kref.refcount));
154 BUG_ON(atomic_read(&bo->kref.refcount));
155 BUG_ON(atomic_read(&bo->cpu_writers));
156 BUG_ON(bo->sync_obj != NULL);
157 BUG_ON(bo->mem.mm_node != NULL);
158 BUG_ON(!list_empty(&bo->lru));
159 BUG_ON(!list_empty(&bo->ddestroy));
160
161 if (bo->ttm)
162 ttm_tt_destroy(bo->ttm);
163 atomic_dec(&bo->glob->bo_count);
164 if (bo->destroy)
165 bo->destroy(bo);
166 else {
167 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
168 kfree(bo);
169 }
170 }
171
172 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
173 {
174
175 if (interruptible) {
176 int ret = 0;
177
178 ret = wait_event_interruptible(bo->event_queue,
179 atomic_read(&bo->reserved) == 0);
180 if (unlikely(ret != 0))
181 return ret;
182 } else {
183 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
184 }
185 return 0;
186 }
187 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
188
189 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
190 {
191 struct ttm_bo_device *bdev = bo->bdev;
192 struct ttm_mem_type_manager *man;
193
194 BUG_ON(!atomic_read(&bo->reserved));
195
196 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
197
198 BUG_ON(!list_empty(&bo->lru));
199
200 man = &bdev->man[bo->mem.mem_type];
201 list_add_tail(&bo->lru, &man->lru);
202 kref_get(&bo->list_kref);
203
204 if (bo->ttm != NULL) {
205 list_add_tail(&bo->swap, &bo->glob->swap_lru);
206 kref_get(&bo->list_kref);
207 }
208 }
209 }
210
211 /**
212 * Call with the lru_lock held.
213 */
214
215 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
216 {
217 int put_count = 0;
218
219 if (!list_empty(&bo->swap)) {
220 list_del_init(&bo->swap);
221 ++put_count;
222 }
223 if (!list_empty(&bo->lru)) {
224 list_del_init(&bo->lru);
225 ++put_count;
226 }
227
228 /*
229 * TODO: Add a driver hook to delete from
230 * driver-specific LRU's here.
231 */
232
233 return put_count;
234 }
235
236 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
237 bool interruptible,
238 bool no_wait, bool use_sequence, uint32_t sequence)
239 {
240 struct ttm_bo_global *glob = bo->glob;
241 int ret;
242
243 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
244 if (use_sequence && bo->seq_valid &&
245 (sequence - bo->val_seq < (1 << 31))) {
246 return -EAGAIN;
247 }
248
249 if (no_wait)
250 return -EBUSY;
251
252 spin_unlock(&glob->lru_lock);
253 ret = ttm_bo_wait_unreserved(bo, interruptible);
254 spin_lock(&glob->lru_lock);
255
256 if (unlikely(ret))
257 return ret;
258 }
259
260 if (use_sequence) {
261 bo->val_seq = sequence;
262 bo->seq_valid = true;
263 } else {
264 bo->seq_valid = false;
265 }
266
267 return 0;
268 }
269 EXPORT_SYMBOL(ttm_bo_reserve);
270
271 static void ttm_bo_ref_bug(struct kref *list_kref)
272 {
273 BUG();
274 }
275
276 int ttm_bo_reserve(struct ttm_buffer_object *bo,
277 bool interruptible,
278 bool no_wait, bool use_sequence, uint32_t sequence)
279 {
280 struct ttm_bo_global *glob = bo->glob;
281 int put_count = 0;
282 int ret;
283
284 spin_lock(&glob->lru_lock);
285 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
286 sequence);
287 if (likely(ret == 0))
288 put_count = ttm_bo_del_from_lru(bo);
289 spin_unlock(&glob->lru_lock);
290
291 while (put_count--)
292 kref_put(&bo->list_kref, ttm_bo_ref_bug);
293
294 return ret;
295 }
296
297 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
298 {
299 struct ttm_bo_global *glob = bo->glob;
300
301 spin_lock(&glob->lru_lock);
302 ttm_bo_add_to_lru(bo);
303 atomic_set(&bo->reserved, 0);
304 wake_up_all(&bo->event_queue);
305 spin_unlock(&glob->lru_lock);
306 }
307 EXPORT_SYMBOL(ttm_bo_unreserve);
308
309 /*
310 * Call bo->mutex locked.
311 */
312 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
313 {
314 struct ttm_bo_device *bdev = bo->bdev;
315 struct ttm_bo_global *glob = bo->glob;
316 int ret = 0;
317 uint32_t page_flags = 0;
318
319 TTM_ASSERT_LOCKED(&bo->mutex);
320 bo->ttm = NULL;
321
322 if (bdev->need_dma32)
323 page_flags |= TTM_PAGE_FLAG_DMA32;
324
325 switch (bo->type) {
326 case ttm_bo_type_device:
327 if (zero_alloc)
328 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
329 case ttm_bo_type_kernel:
330 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
331 page_flags, glob->dummy_read_page);
332 if (unlikely(bo->ttm == NULL))
333 ret = -ENOMEM;
334 break;
335 case ttm_bo_type_user:
336 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
337 page_flags | TTM_PAGE_FLAG_USER,
338 glob->dummy_read_page);
339 if (unlikely(bo->ttm == NULL)) {
340 ret = -ENOMEM;
341 break;
342 }
343
344 ret = ttm_tt_set_user(bo->ttm, current,
345 bo->buffer_start, bo->num_pages);
346 if (unlikely(ret != 0))
347 ttm_tt_destroy(bo->ttm);
348 break;
349 default:
350 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
351 ret = -EINVAL;
352 break;
353 }
354
355 return ret;
356 }
357
358 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
359 struct ttm_mem_reg *mem,
360 bool evict, bool interruptible, bool no_wait)
361 {
362 struct ttm_bo_device *bdev = bo->bdev;
363 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
364 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
365 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
366 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
367 int ret = 0;
368
369 if (old_is_pci || new_is_pci ||
370 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
371 ttm_bo_unmap_virtual(bo);
372
373 /*
374 * Create and bind a ttm if required.
375 */
376
377 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
378 ret = ttm_bo_add_ttm(bo, false);
379 if (ret)
380 goto out_err;
381
382 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
383 if (ret)
384 goto out_err;
385
386 if (mem->mem_type != TTM_PL_SYSTEM) {
387 ret = ttm_tt_bind(bo->ttm, mem);
388 if (ret)
389 goto out_err;
390 }
391
392 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
393 bo->mem = *mem;
394 mem->mm_node = NULL;
395 goto moved;
396 }
397
398 }
399
400 if (bdev->driver->move_notify)
401 bdev->driver->move_notify(bo, mem);
402
403 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
404 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
405 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
406 else if (bdev->driver->move)
407 ret = bdev->driver->move(bo, evict, interruptible,
408 no_wait, mem);
409 else
410 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
411
412 if (ret)
413 goto out_err;
414
415 moved:
416 if (bo->evicted) {
417 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
418 if (ret)
419 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
420 bo->evicted = false;
421 }
422
423 if (bo->mem.mm_node) {
424 spin_lock(&bo->lock);
425 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
426 bdev->man[bo->mem.mem_type].gpu_offset;
427 bo->cur_placement = bo->mem.placement;
428 spin_unlock(&bo->lock);
429 }
430
431 return 0;
432
433 out_err:
434 new_man = &bdev->man[bo->mem.mem_type];
435 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
436 ttm_tt_unbind(bo->ttm);
437 ttm_tt_destroy(bo->ttm);
438 bo->ttm = NULL;
439 }
440
441 return ret;
442 }
443
444 /**
445 * If bo idle, remove from delayed- and lru lists, and unref.
446 * If not idle, and already on delayed list, do nothing.
447 * If not idle, and not on delayed list, put on delayed list,
448 * up the list_kref and schedule a delayed list check.
449 */
450
451 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
452 {
453 struct ttm_bo_device *bdev = bo->bdev;
454 struct ttm_bo_global *glob = bo->glob;
455 struct ttm_bo_driver *driver = bdev->driver;
456 int ret;
457
458 spin_lock(&bo->lock);
459 (void) ttm_bo_wait(bo, false, false, !remove_all);
460
461 if (!bo->sync_obj) {
462 int put_count;
463
464 spin_unlock(&bo->lock);
465
466 spin_lock(&glob->lru_lock);
467 put_count = ttm_bo_del_from_lru(bo);
468
469 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
470 BUG_ON(ret);
471 if (bo->ttm)
472 ttm_tt_unbind(bo->ttm);
473
474 if (!list_empty(&bo->ddestroy)) {
475 list_del_init(&bo->ddestroy);
476 ++put_count;
477 }
478 if (bo->mem.mm_node) {
479 bo->mem.mm_node->private = NULL;
480 drm_mm_put_block(bo->mem.mm_node);
481 bo->mem.mm_node = NULL;
482 }
483 spin_unlock(&glob->lru_lock);
484
485 atomic_set(&bo->reserved, 0);
486
487 while (put_count--)
488 kref_put(&bo->list_kref, ttm_bo_ref_bug);
489
490 return 0;
491 }
492
493 spin_lock(&glob->lru_lock);
494 if (list_empty(&bo->ddestroy)) {
495 void *sync_obj = bo->sync_obj;
496 void *sync_obj_arg = bo->sync_obj_arg;
497
498 kref_get(&bo->list_kref);
499 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
500 spin_unlock(&glob->lru_lock);
501 spin_unlock(&bo->lock);
502
503 if (sync_obj)
504 driver->sync_obj_flush(sync_obj, sync_obj_arg);
505 schedule_delayed_work(&bdev->wq,
506 ((HZ / 100) < 1) ? 1 : HZ / 100);
507 ret = 0;
508
509 } else {
510 spin_unlock(&glob->lru_lock);
511 spin_unlock(&bo->lock);
512 ret = -EBUSY;
513 }
514
515 return ret;
516 }
517
518 /**
519 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
520 * encountered buffers.
521 */
522
523 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
524 {
525 struct ttm_bo_global *glob = bdev->glob;
526 struct ttm_buffer_object *entry, *nentry;
527 struct list_head *list, *next;
528 int ret;
529
530 spin_lock(&glob->lru_lock);
531 list_for_each_safe(list, next, &bdev->ddestroy) {
532 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
533 nentry = NULL;
534
535 /*
536 * Protect the next list entry from destruction while we
537 * unlock the lru_lock.
538 */
539
540 if (next != &bdev->ddestroy) {
541 nentry = list_entry(next, struct ttm_buffer_object,
542 ddestroy);
543 kref_get(&nentry->list_kref);
544 }
545 kref_get(&entry->list_kref);
546
547 spin_unlock(&glob->lru_lock);
548 ret = ttm_bo_cleanup_refs(entry, remove_all);
549 kref_put(&entry->list_kref, ttm_bo_release_list);
550
551 spin_lock(&glob->lru_lock);
552 if (nentry) {
553 bool next_onlist = !list_empty(next);
554 spin_unlock(&glob->lru_lock);
555 kref_put(&nentry->list_kref, ttm_bo_release_list);
556 spin_lock(&glob->lru_lock);
557 /*
558 * Someone might have raced us and removed the
559 * next entry from the list. We don't bother restarting
560 * list traversal.
561 */
562
563 if (!next_onlist)
564 break;
565 }
566 if (ret)
567 break;
568 }
569 ret = !list_empty(&bdev->ddestroy);
570 spin_unlock(&glob->lru_lock);
571
572 return ret;
573 }
574
575 static void ttm_bo_delayed_workqueue(struct work_struct *work)
576 {
577 struct ttm_bo_device *bdev =
578 container_of(work, struct ttm_bo_device, wq.work);
579
580 if (ttm_bo_delayed_delete(bdev, false)) {
581 schedule_delayed_work(&bdev->wq,
582 ((HZ / 100) < 1) ? 1 : HZ / 100);
583 }
584 }
585
586 static void ttm_bo_release(struct kref *kref)
587 {
588 struct ttm_buffer_object *bo =
589 container_of(kref, struct ttm_buffer_object, kref);
590 struct ttm_bo_device *bdev = bo->bdev;
591
592 if (likely(bo->vm_node != NULL)) {
593 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
594 drm_mm_put_block(bo->vm_node);
595 bo->vm_node = NULL;
596 }
597 write_unlock(&bdev->vm_lock);
598 ttm_bo_cleanup_refs(bo, false);
599 kref_put(&bo->list_kref, ttm_bo_release_list);
600 write_lock(&bdev->vm_lock);
601 }
602
603 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
604 {
605 struct ttm_buffer_object *bo = *p_bo;
606 struct ttm_bo_device *bdev = bo->bdev;
607
608 *p_bo = NULL;
609 write_lock(&bdev->vm_lock);
610 kref_put(&bo->kref, ttm_bo_release);
611 write_unlock(&bdev->vm_lock);
612 }
613 EXPORT_SYMBOL(ttm_bo_unref);
614
615 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
616 bool no_wait)
617 {
618 struct ttm_bo_device *bdev = bo->bdev;
619 struct ttm_bo_global *glob = bo->glob;
620 struct ttm_mem_reg evict_mem;
621 struct ttm_placement placement;
622 int ret = 0;
623
624 spin_lock(&bo->lock);
625 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
626 spin_unlock(&bo->lock);
627
628 if (unlikely(ret != 0)) {
629 if (ret != -ERESTARTSYS) {
630 printk(KERN_ERR TTM_PFX
631 "Failed to expire sync object before "
632 "buffer eviction.\n");
633 }
634 goto out;
635 }
636
637 BUG_ON(!atomic_read(&bo->reserved));
638
639 evict_mem = bo->mem;
640 evict_mem.mm_node = NULL;
641
642 placement.fpfn = 0;
643 placement.lpfn = 0;
644 placement.num_placement = 0;
645 placement.num_busy_placement = 0;
646 bdev->driver->evict_flags(bo, &placement);
647 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
648 no_wait);
649 if (ret) {
650 if (ret != -ERESTARTSYS) {
651 printk(KERN_ERR TTM_PFX
652 "Failed to find memory space for "
653 "buffer 0x%p eviction.\n", bo);
654 ttm_bo_mem_space_debug(bo, &placement);
655 }
656 goto out;
657 }
658
659 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
660 no_wait);
661 if (ret) {
662 if (ret != -ERESTARTSYS)
663 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
664 spin_lock(&glob->lru_lock);
665 if (evict_mem.mm_node) {
666 evict_mem.mm_node->private = NULL;
667 drm_mm_put_block(evict_mem.mm_node);
668 evict_mem.mm_node = NULL;
669 }
670 spin_unlock(&glob->lru_lock);
671 goto out;
672 }
673 bo->evicted = true;
674 out:
675 return ret;
676 }
677
678 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
679 uint32_t mem_type,
680 bool interruptible, bool no_wait)
681 {
682 struct ttm_bo_global *glob = bdev->glob;
683 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
684 struct ttm_buffer_object *bo;
685 int ret, put_count = 0;
686
687 retry:
688 spin_lock(&glob->lru_lock);
689 if (list_empty(&man->lru)) {
690 spin_unlock(&glob->lru_lock);
691 return -EBUSY;
692 }
693
694 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
695 kref_get(&bo->list_kref);
696
697 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
698
699 if (unlikely(ret == -EBUSY)) {
700 spin_unlock(&glob->lru_lock);
701 if (likely(!no_wait))
702 ret = ttm_bo_wait_unreserved(bo, interruptible);
703
704 kref_put(&bo->list_kref, ttm_bo_release_list);
705
706 /**
707 * We *need* to retry after releasing the lru lock.
708 */
709
710 if (unlikely(ret != 0))
711 return ret;
712 goto retry;
713 }
714
715 put_count = ttm_bo_del_from_lru(bo);
716 spin_unlock(&glob->lru_lock);
717
718 BUG_ON(ret != 0);
719
720 while (put_count--)
721 kref_put(&bo->list_kref, ttm_bo_ref_bug);
722
723 ret = ttm_bo_evict(bo, interruptible, no_wait);
724 ttm_bo_unreserve(bo);
725
726 kref_put(&bo->list_kref, ttm_bo_release_list);
727 return ret;
728 }
729
730 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
731 struct ttm_mem_type_manager *man,
732 struct ttm_placement *placement,
733 struct ttm_mem_reg *mem,
734 struct drm_mm_node **node)
735 {
736 struct ttm_bo_global *glob = bo->glob;
737 unsigned long lpfn;
738 int ret;
739
740 lpfn = placement->lpfn;
741 if (!lpfn)
742 lpfn = man->size;
743 *node = NULL;
744 do {
745 ret = drm_mm_pre_get(&man->manager);
746 if (unlikely(ret))
747 return ret;
748
749 spin_lock(&glob->lru_lock);
750 *node = drm_mm_search_free_in_range(&man->manager,
751 mem->num_pages, mem->page_alignment,
752 placement->fpfn, lpfn, 1);
753 if (unlikely(*node == NULL)) {
754 spin_unlock(&glob->lru_lock);
755 return 0;
756 }
757 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
758 mem->page_alignment,
759 placement->fpfn,
760 lpfn);
761 spin_unlock(&glob->lru_lock);
762 } while (*node == NULL);
763 return 0;
764 }
765
766 /**
767 * Repeatedly evict memory from the LRU for @mem_type until we create enough
768 * space, or we've evicted everything and there isn't enough space.
769 */
770 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
771 uint32_t mem_type,
772 struct ttm_placement *placement,
773 struct ttm_mem_reg *mem,
774 bool interruptible, bool no_wait)
775 {
776 struct ttm_bo_device *bdev = bo->bdev;
777 struct ttm_bo_global *glob = bdev->glob;
778 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
779 struct drm_mm_node *node;
780 int ret;
781
782 do {
783 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
784 if (unlikely(ret != 0))
785 return ret;
786 if (node)
787 break;
788 spin_lock(&glob->lru_lock);
789 if (list_empty(&man->lru)) {
790 spin_unlock(&glob->lru_lock);
791 break;
792 }
793 spin_unlock(&glob->lru_lock);
794 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
795 no_wait);
796 if (unlikely(ret != 0))
797 return ret;
798 } while (1);
799 if (node == NULL)
800 return -ENOMEM;
801 mem->mm_node = node;
802 mem->mem_type = mem_type;
803 return 0;
804 }
805
806 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
807 uint32_t cur_placement,
808 uint32_t proposed_placement)
809 {
810 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
811 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
812
813 /**
814 * Keep current caching if possible.
815 */
816
817 if ((cur_placement & caching) != 0)
818 result |= (cur_placement & caching);
819 else if ((man->default_caching & caching) != 0)
820 result |= man->default_caching;
821 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
822 result |= TTM_PL_FLAG_CACHED;
823 else if ((TTM_PL_FLAG_WC & caching) != 0)
824 result |= TTM_PL_FLAG_WC;
825 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
826 result |= TTM_PL_FLAG_UNCACHED;
827
828 return result;
829 }
830
831 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
832 bool disallow_fixed,
833 uint32_t mem_type,
834 uint32_t proposed_placement,
835 uint32_t *masked_placement)
836 {
837 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
838
839 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
840 return false;
841
842 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
843 return false;
844
845 if ((proposed_placement & man->available_caching) == 0)
846 return false;
847
848 cur_flags |= (proposed_placement & man->available_caching);
849
850 *masked_placement = cur_flags;
851 return true;
852 }
853
854 /**
855 * Creates space for memory region @mem according to its type.
856 *
857 * This function first searches for free space in compatible memory types in
858 * the priority order defined by the driver. If free space isn't found, then
859 * ttm_bo_mem_force_space is attempted in priority order to evict and find
860 * space.
861 */
862 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
863 struct ttm_placement *placement,
864 struct ttm_mem_reg *mem,
865 bool interruptible, bool no_wait)
866 {
867 struct ttm_bo_device *bdev = bo->bdev;
868 struct ttm_mem_type_manager *man;
869 uint32_t mem_type = TTM_PL_SYSTEM;
870 uint32_t cur_flags = 0;
871 bool type_found = false;
872 bool type_ok = false;
873 bool has_erestartsys = false;
874 struct drm_mm_node *node = NULL;
875 int i, ret;
876
877 mem->mm_node = NULL;
878 for (i = 0; i < placement->num_placement; ++i) {
879 ret = ttm_mem_type_from_flags(placement->placement[i],
880 &mem_type);
881 if (ret)
882 return ret;
883 man = &bdev->man[mem_type];
884
885 type_ok = ttm_bo_mt_compatible(man,
886 bo->type == ttm_bo_type_user,
887 mem_type,
888 placement->placement[i],
889 &cur_flags);
890
891 if (!type_ok)
892 continue;
893
894 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
895 cur_flags);
896 /*
897 * Use the access and other non-mapping-related flag bits from
898 * the memory placement flags to the current flags
899 */
900 ttm_flag_masked(&cur_flags, placement->placement[i],
901 ~TTM_PL_MASK_MEMTYPE);
902
903 if (mem_type == TTM_PL_SYSTEM)
904 break;
905
906 if (man->has_type && man->use_type) {
907 type_found = true;
908 ret = ttm_bo_man_get_node(bo, man, placement, mem,
909 &node);
910 if (unlikely(ret))
911 return ret;
912 }
913 if (node)
914 break;
915 }
916
917 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
918 mem->mm_node = node;
919 mem->mem_type = mem_type;
920 mem->placement = cur_flags;
921 if (node)
922 node->private = bo;
923 return 0;
924 }
925
926 if (!type_found)
927 return -EINVAL;
928
929 for (i = 0; i < placement->num_busy_placement; ++i) {
930 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
931 &mem_type);
932 if (ret)
933 return ret;
934 man = &bdev->man[mem_type];
935 if (!man->has_type)
936 continue;
937 if (!ttm_bo_mt_compatible(man,
938 bo->type == ttm_bo_type_user,
939 mem_type,
940 placement->busy_placement[i],
941 &cur_flags))
942 continue;
943
944 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
945 cur_flags);
946 /*
947 * Use the access and other non-mapping-related flag bits from
948 * the memory placement flags to the current flags
949 */
950 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
951 ~TTM_PL_MASK_MEMTYPE);
952
953 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
954 interruptible, no_wait);
955 if (ret == 0 && mem->mm_node) {
956 mem->placement = cur_flags;
957 mem->mm_node->private = bo;
958 return 0;
959 }
960 if (ret == -ERESTARTSYS)
961 has_erestartsys = true;
962 }
963 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
964 return ret;
965 }
966 EXPORT_SYMBOL(ttm_bo_mem_space);
967
968 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
969 {
970 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
971 return -EBUSY;
972
973 return wait_event_interruptible(bo->event_queue,
974 atomic_read(&bo->cpu_writers) == 0);
975 }
976 EXPORT_SYMBOL(ttm_bo_wait_cpu);
977
978 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
979 struct ttm_placement *placement,
980 bool interruptible, bool no_wait)
981 {
982 struct ttm_bo_global *glob = bo->glob;
983 int ret = 0;
984 struct ttm_mem_reg mem;
985
986 BUG_ON(!atomic_read(&bo->reserved));
987
988 /*
989 * FIXME: It's possible to pipeline buffer moves.
990 * Have the driver move function wait for idle when necessary,
991 * instead of doing it here.
992 */
993 spin_lock(&bo->lock);
994 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
995 spin_unlock(&bo->lock);
996 if (ret)
997 return ret;
998 mem.num_pages = bo->num_pages;
999 mem.size = mem.num_pages << PAGE_SHIFT;
1000 mem.page_alignment = bo->mem.page_alignment;
1001 /*
1002 * Determine where to move the buffer.
1003 */
1004 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait);
1005 if (ret)
1006 goto out_unlock;
1007 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
1008 out_unlock:
1009 if (ret && mem.mm_node) {
1010 spin_lock(&glob->lru_lock);
1011 mem.mm_node->private = NULL;
1012 drm_mm_put_block(mem.mm_node);
1013 spin_unlock(&glob->lru_lock);
1014 }
1015 return ret;
1016 }
1017
1018 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1019 struct ttm_mem_reg *mem)
1020 {
1021 int i;
1022
1023 for (i = 0; i < placement->num_placement; i++) {
1024 if ((placement->placement[i] & mem->placement &
1025 TTM_PL_MASK_CACHING) &&
1026 (placement->placement[i] & mem->placement &
1027 TTM_PL_MASK_MEM))
1028 return i;
1029 }
1030 return -1;
1031 }
1032
1033 int ttm_bo_validate(struct ttm_buffer_object *bo,
1034 struct ttm_placement *placement,
1035 bool interruptible, bool no_wait)
1036 {
1037 int ret;
1038
1039 BUG_ON(!atomic_read(&bo->reserved));
1040 /* Check that range is valid */
1041 if (placement->lpfn || placement->fpfn)
1042 if (placement->fpfn > placement->lpfn ||
1043 (placement->lpfn - placement->fpfn) < bo->num_pages)
1044 return -EINVAL;
1045 /*
1046 * Check whether we need to move buffer.
1047 */
1048 ret = ttm_bo_mem_compat(placement, &bo->mem);
1049 if (ret < 0) {
1050 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait);
1051 if (ret)
1052 return ret;
1053 } else {
1054 /*
1055 * Use the access and other non-mapping-related flag bits from
1056 * the compatible memory placement flags to the active flags
1057 */
1058 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1059 ~TTM_PL_MASK_MEMTYPE);
1060 }
1061 /*
1062 * We might need to add a TTM.
1063 */
1064 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1065 ret = ttm_bo_add_ttm(bo, true);
1066 if (ret)
1067 return ret;
1068 }
1069 return 0;
1070 }
1071 EXPORT_SYMBOL(ttm_bo_validate);
1072
1073 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1074 struct ttm_placement *placement)
1075 {
1076 int i;
1077
1078 if (placement->fpfn || placement->lpfn) {
1079 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1080 printk(KERN_ERR TTM_PFX "Page number range to small "
1081 "Need %lu pages, range is [%u, %u]\n",
1082 bo->mem.num_pages, placement->fpfn,
1083 placement->lpfn);
1084 return -EINVAL;
1085 }
1086 }
1087 for (i = 0; i < placement->num_placement; i++) {
1088 if (!capable(CAP_SYS_ADMIN)) {
1089 if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1090 printk(KERN_ERR TTM_PFX "Need to be root to "
1091 "modify NO_EVICT status.\n");
1092 return -EINVAL;
1093 }
1094 }
1095 }
1096 for (i = 0; i < placement->num_busy_placement; i++) {
1097 if (!capable(CAP_SYS_ADMIN)) {
1098 if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1099 printk(KERN_ERR TTM_PFX "Need to be root to "
1100 "modify NO_EVICT status.\n");
1101 return -EINVAL;
1102 }
1103 }
1104 }
1105 return 0;
1106 }
1107
1108 int ttm_bo_init(struct ttm_bo_device *bdev,
1109 struct ttm_buffer_object *bo,
1110 unsigned long size,
1111 enum ttm_bo_type type,
1112 struct ttm_placement *placement,
1113 uint32_t page_alignment,
1114 unsigned long buffer_start,
1115 bool interruptible,
1116 struct file *persistant_swap_storage,
1117 size_t acc_size,
1118 void (*destroy) (struct ttm_buffer_object *))
1119 {
1120 int ret = 0;
1121 unsigned long num_pages;
1122
1123 size += buffer_start & ~PAGE_MASK;
1124 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1125 if (num_pages == 0) {
1126 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1127 return -EINVAL;
1128 }
1129 bo->destroy = destroy;
1130
1131 spin_lock_init(&bo->lock);
1132 kref_init(&bo->kref);
1133 kref_init(&bo->list_kref);
1134 atomic_set(&bo->cpu_writers, 0);
1135 atomic_set(&bo->reserved, 1);
1136 init_waitqueue_head(&bo->event_queue);
1137 INIT_LIST_HEAD(&bo->lru);
1138 INIT_LIST_HEAD(&bo->ddestroy);
1139 INIT_LIST_HEAD(&bo->swap);
1140 bo->bdev = bdev;
1141 bo->glob = bdev->glob;
1142 bo->type = type;
1143 bo->num_pages = num_pages;
1144 bo->mem.size = num_pages << PAGE_SHIFT;
1145 bo->mem.mem_type = TTM_PL_SYSTEM;
1146 bo->mem.num_pages = bo->num_pages;
1147 bo->mem.mm_node = NULL;
1148 bo->mem.page_alignment = page_alignment;
1149 bo->buffer_start = buffer_start & PAGE_MASK;
1150 bo->priv_flags = 0;
1151 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1152 bo->seq_valid = false;
1153 bo->persistant_swap_storage = persistant_swap_storage;
1154 bo->acc_size = acc_size;
1155 atomic_inc(&bo->glob->bo_count);
1156
1157 ret = ttm_bo_check_placement(bo, placement);
1158 if (unlikely(ret != 0))
1159 goto out_err;
1160
1161 /*
1162 * For ttm_bo_type_device buffers, allocate
1163 * address space from the device.
1164 */
1165 if (bo->type == ttm_bo_type_device) {
1166 ret = ttm_bo_setup_vm(bo);
1167 if (ret)
1168 goto out_err;
1169 }
1170
1171 ret = ttm_bo_validate(bo, placement, interruptible, false);
1172 if (ret)
1173 goto out_err;
1174
1175 ttm_bo_unreserve(bo);
1176 return 0;
1177
1178 out_err:
1179 ttm_bo_unreserve(bo);
1180 ttm_bo_unref(&bo);
1181
1182 return ret;
1183 }
1184 EXPORT_SYMBOL(ttm_bo_init);
1185
1186 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1187 unsigned long num_pages)
1188 {
1189 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1190 PAGE_MASK;
1191
1192 return glob->ttm_bo_size + 2 * page_array_size;
1193 }
1194
1195 int ttm_bo_create(struct ttm_bo_device *bdev,
1196 unsigned long size,
1197 enum ttm_bo_type type,
1198 struct ttm_placement *placement,
1199 uint32_t page_alignment,
1200 unsigned long buffer_start,
1201 bool interruptible,
1202 struct file *persistant_swap_storage,
1203 struct ttm_buffer_object **p_bo)
1204 {
1205 struct ttm_buffer_object *bo;
1206 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1207 int ret;
1208
1209 size_t acc_size =
1210 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1211 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1212 if (unlikely(ret != 0))
1213 return ret;
1214
1215 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1216
1217 if (unlikely(bo == NULL)) {
1218 ttm_mem_global_free(mem_glob, acc_size);
1219 return -ENOMEM;
1220 }
1221
1222 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1223 buffer_start, interruptible,
1224 persistant_swap_storage, acc_size, NULL);
1225 if (likely(ret == 0))
1226 *p_bo = bo;
1227
1228 return ret;
1229 }
1230
1231 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1232 unsigned mem_type, bool allow_errors)
1233 {
1234 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1235 struct ttm_bo_global *glob = bdev->glob;
1236 int ret;
1237
1238 /*
1239 * Can't use standard list traversal since we're unlocking.
1240 */
1241
1242 spin_lock(&glob->lru_lock);
1243 while (!list_empty(&man->lru)) {
1244 spin_unlock(&glob->lru_lock);
1245 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1246 if (ret) {
1247 if (allow_errors) {
1248 return ret;
1249 } else {
1250 printk(KERN_ERR TTM_PFX
1251 "Cleanup eviction failed\n");
1252 }
1253 }
1254 spin_lock(&glob->lru_lock);
1255 }
1256 spin_unlock(&glob->lru_lock);
1257 return 0;
1258 }
1259
1260 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1261 {
1262 struct ttm_bo_global *glob = bdev->glob;
1263 struct ttm_mem_type_manager *man;
1264 int ret = -EINVAL;
1265
1266 if (mem_type >= TTM_NUM_MEM_TYPES) {
1267 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1268 return ret;
1269 }
1270 man = &bdev->man[mem_type];
1271
1272 if (!man->has_type) {
1273 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1274 "memory manager type %u\n", mem_type);
1275 return ret;
1276 }
1277
1278 man->use_type = false;
1279 man->has_type = false;
1280
1281 ret = 0;
1282 if (mem_type > 0) {
1283 ttm_bo_force_list_clean(bdev, mem_type, false);
1284
1285 spin_lock(&glob->lru_lock);
1286 if (drm_mm_clean(&man->manager))
1287 drm_mm_takedown(&man->manager);
1288 else
1289 ret = -EBUSY;
1290
1291 spin_unlock(&glob->lru_lock);
1292 }
1293
1294 return ret;
1295 }
1296 EXPORT_SYMBOL(ttm_bo_clean_mm);
1297
1298 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1299 {
1300 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1301
1302 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1303 printk(KERN_ERR TTM_PFX
1304 "Illegal memory manager memory type %u.\n",
1305 mem_type);
1306 return -EINVAL;
1307 }
1308
1309 if (!man->has_type) {
1310 printk(KERN_ERR TTM_PFX
1311 "Memory type %u has not been initialized.\n",
1312 mem_type);
1313 return 0;
1314 }
1315
1316 return ttm_bo_force_list_clean(bdev, mem_type, true);
1317 }
1318 EXPORT_SYMBOL(ttm_bo_evict_mm);
1319
1320 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1321 unsigned long p_size)
1322 {
1323 int ret = -EINVAL;
1324 struct ttm_mem_type_manager *man;
1325
1326 if (type >= TTM_NUM_MEM_TYPES) {
1327 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1328 return ret;
1329 }
1330
1331 man = &bdev->man[type];
1332 if (man->has_type) {
1333 printk(KERN_ERR TTM_PFX
1334 "Memory manager already initialized for type %d\n",
1335 type);
1336 return ret;
1337 }
1338
1339 ret = bdev->driver->init_mem_type(bdev, type, man);
1340 if (ret)
1341 return ret;
1342
1343 ret = 0;
1344 if (type != TTM_PL_SYSTEM) {
1345 if (!p_size) {
1346 printk(KERN_ERR TTM_PFX
1347 "Zero size memory manager type %d\n",
1348 type);
1349 return ret;
1350 }
1351 ret = drm_mm_init(&man->manager, 0, p_size);
1352 if (ret)
1353 return ret;
1354 }
1355 man->has_type = true;
1356 man->use_type = true;
1357 man->size = p_size;
1358
1359 INIT_LIST_HEAD(&man->lru);
1360
1361 return 0;
1362 }
1363 EXPORT_SYMBOL(ttm_bo_init_mm);
1364
1365 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1366 {
1367 struct ttm_bo_global *glob =
1368 container_of(kobj, struct ttm_bo_global, kobj);
1369
1370 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1371 __free_page(glob->dummy_read_page);
1372 kfree(glob);
1373 }
1374
1375 void ttm_bo_global_release(struct ttm_global_reference *ref)
1376 {
1377 struct ttm_bo_global *glob = ref->object;
1378
1379 kobject_del(&glob->kobj);
1380 kobject_put(&glob->kobj);
1381 }
1382 EXPORT_SYMBOL(ttm_bo_global_release);
1383
1384 int ttm_bo_global_init(struct ttm_global_reference *ref)
1385 {
1386 struct ttm_bo_global_ref *bo_ref =
1387 container_of(ref, struct ttm_bo_global_ref, ref);
1388 struct ttm_bo_global *glob = ref->object;
1389 int ret;
1390
1391 mutex_init(&glob->device_list_mutex);
1392 spin_lock_init(&glob->lru_lock);
1393 glob->mem_glob = bo_ref->mem_glob;
1394 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1395
1396 if (unlikely(glob->dummy_read_page == NULL)) {
1397 ret = -ENOMEM;
1398 goto out_no_drp;
1399 }
1400
1401 INIT_LIST_HEAD(&glob->swap_lru);
1402 INIT_LIST_HEAD(&glob->device_list);
1403
1404 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1405 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1406 if (unlikely(ret != 0)) {
1407 printk(KERN_ERR TTM_PFX
1408 "Could not register buffer object swapout.\n");
1409 goto out_no_shrink;
1410 }
1411
1412 glob->ttm_bo_extra_size =
1413 ttm_round_pot(sizeof(struct ttm_tt)) +
1414 ttm_round_pot(sizeof(struct ttm_backend));
1415
1416 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1417 ttm_round_pot(sizeof(struct ttm_buffer_object));
1418
1419 atomic_set(&glob->bo_count, 0);
1420
1421 kobject_init(&glob->kobj, &ttm_bo_glob_kobj_type);
1422 ret = kobject_add(&glob->kobj, ttm_get_kobj(), "buffer_objects");
1423 if (unlikely(ret != 0))
1424 kobject_put(&glob->kobj);
1425 return ret;
1426 out_no_shrink:
1427 __free_page(glob->dummy_read_page);
1428 out_no_drp:
1429 kfree(glob);
1430 return ret;
1431 }
1432 EXPORT_SYMBOL(ttm_bo_global_init);
1433
1434
1435 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1436 {
1437 int ret = 0;
1438 unsigned i = TTM_NUM_MEM_TYPES;
1439 struct ttm_mem_type_manager *man;
1440 struct ttm_bo_global *glob = bdev->glob;
1441
1442 while (i--) {
1443 man = &bdev->man[i];
1444 if (man->has_type) {
1445 man->use_type = false;
1446 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1447 ret = -EBUSY;
1448 printk(KERN_ERR TTM_PFX
1449 "DRM memory manager type %d "
1450 "is not clean.\n", i);
1451 }
1452 man->has_type = false;
1453 }
1454 }
1455
1456 mutex_lock(&glob->device_list_mutex);
1457 list_del(&bdev->device_list);
1458 mutex_unlock(&glob->device_list_mutex);
1459
1460 if (!cancel_delayed_work(&bdev->wq))
1461 flush_scheduled_work();
1462
1463 while (ttm_bo_delayed_delete(bdev, true))
1464 ;
1465
1466 spin_lock(&glob->lru_lock);
1467 if (list_empty(&bdev->ddestroy))
1468 TTM_DEBUG("Delayed destroy list was clean\n");
1469
1470 if (list_empty(&bdev->man[0].lru))
1471 TTM_DEBUG("Swap list was clean\n");
1472 spin_unlock(&glob->lru_lock);
1473
1474 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1475 write_lock(&bdev->vm_lock);
1476 drm_mm_takedown(&bdev->addr_space_mm);
1477 write_unlock(&bdev->vm_lock);
1478
1479 return ret;
1480 }
1481 EXPORT_SYMBOL(ttm_bo_device_release);
1482
1483 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1484 struct ttm_bo_global *glob,
1485 struct ttm_bo_driver *driver,
1486 uint64_t file_page_offset,
1487 bool need_dma32)
1488 {
1489 int ret = -EINVAL;
1490
1491 rwlock_init(&bdev->vm_lock);
1492 bdev->driver = driver;
1493
1494 memset(bdev->man, 0, sizeof(bdev->man));
1495
1496 /*
1497 * Initialize the system memory buffer type.
1498 * Other types need to be driver / IOCTL initialized.
1499 */
1500 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1501 if (unlikely(ret != 0))
1502 goto out_no_sys;
1503
1504 bdev->addr_space_rb = RB_ROOT;
1505 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1506 if (unlikely(ret != 0))
1507 goto out_no_addr_mm;
1508
1509 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1510 bdev->nice_mode = true;
1511 INIT_LIST_HEAD(&bdev->ddestroy);
1512 bdev->dev_mapping = NULL;
1513 bdev->glob = glob;
1514 bdev->need_dma32 = need_dma32;
1515
1516 mutex_lock(&glob->device_list_mutex);
1517 list_add_tail(&bdev->device_list, &glob->device_list);
1518 mutex_unlock(&glob->device_list_mutex);
1519
1520 return 0;
1521 out_no_addr_mm:
1522 ttm_bo_clean_mm(bdev, 0);
1523 out_no_sys:
1524 return ret;
1525 }
1526 EXPORT_SYMBOL(ttm_bo_device_init);
1527
1528 /*
1529 * buffer object vm functions.
1530 */
1531
1532 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1533 {
1534 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1535
1536 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1537 if (mem->mem_type == TTM_PL_SYSTEM)
1538 return false;
1539
1540 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1541 return false;
1542
1543 if (mem->placement & TTM_PL_FLAG_CACHED)
1544 return false;
1545 }
1546 return true;
1547 }
1548
1549 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1550 struct ttm_mem_reg *mem,
1551 unsigned long *bus_base,
1552 unsigned long *bus_offset, unsigned long *bus_size)
1553 {
1554 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1555
1556 *bus_size = 0;
1557 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1558 return -EINVAL;
1559
1560 if (ttm_mem_reg_is_pci(bdev, mem)) {
1561 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1562 *bus_size = mem->num_pages << PAGE_SHIFT;
1563 *bus_base = man->io_offset;
1564 }
1565
1566 return 0;
1567 }
1568
1569 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1570 {
1571 struct ttm_bo_device *bdev = bo->bdev;
1572 loff_t offset = (loff_t) bo->addr_space_offset;
1573 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1574
1575 if (!bdev->dev_mapping)
1576 return;
1577
1578 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1579 }
1580 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1581
1582 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1583 {
1584 struct ttm_bo_device *bdev = bo->bdev;
1585 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1586 struct rb_node *parent = NULL;
1587 struct ttm_buffer_object *cur_bo;
1588 unsigned long offset = bo->vm_node->start;
1589 unsigned long cur_offset;
1590
1591 while (*cur) {
1592 parent = *cur;
1593 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1594 cur_offset = cur_bo->vm_node->start;
1595 if (offset < cur_offset)
1596 cur = &parent->rb_left;
1597 else if (offset > cur_offset)
1598 cur = &parent->rb_right;
1599 else
1600 BUG();
1601 }
1602
1603 rb_link_node(&bo->vm_rb, parent, cur);
1604 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1605 }
1606
1607 /**
1608 * ttm_bo_setup_vm:
1609 *
1610 * @bo: the buffer to allocate address space for
1611 *
1612 * Allocate address space in the drm device so that applications
1613 * can mmap the buffer and access the contents. This only
1614 * applies to ttm_bo_type_device objects as others are not
1615 * placed in the drm device address space.
1616 */
1617
1618 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1619 {
1620 struct ttm_bo_device *bdev = bo->bdev;
1621 int ret;
1622
1623 retry_pre_get:
1624 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1625 if (unlikely(ret != 0))
1626 return ret;
1627
1628 write_lock(&bdev->vm_lock);
1629 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1630 bo->mem.num_pages, 0, 0);
1631
1632 if (unlikely(bo->vm_node == NULL)) {
1633 ret = -ENOMEM;
1634 goto out_unlock;
1635 }
1636
1637 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1638 bo->mem.num_pages, 0);
1639
1640 if (unlikely(bo->vm_node == NULL)) {
1641 write_unlock(&bdev->vm_lock);
1642 goto retry_pre_get;
1643 }
1644
1645 ttm_bo_vm_insert_rb(bo);
1646 write_unlock(&bdev->vm_lock);
1647 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1648
1649 return 0;
1650 out_unlock:
1651 write_unlock(&bdev->vm_lock);
1652 return ret;
1653 }
1654
1655 int ttm_bo_wait(struct ttm_buffer_object *bo,
1656 bool lazy, bool interruptible, bool no_wait)
1657 {
1658 struct ttm_bo_driver *driver = bo->bdev->driver;
1659 void *sync_obj;
1660 void *sync_obj_arg;
1661 int ret = 0;
1662
1663 if (likely(bo->sync_obj == NULL))
1664 return 0;
1665
1666 while (bo->sync_obj) {
1667
1668 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1669 void *tmp_obj = bo->sync_obj;
1670 bo->sync_obj = NULL;
1671 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1672 spin_unlock(&bo->lock);
1673 driver->sync_obj_unref(&tmp_obj);
1674 spin_lock(&bo->lock);
1675 continue;
1676 }
1677
1678 if (no_wait)
1679 return -EBUSY;
1680
1681 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1682 sync_obj_arg = bo->sync_obj_arg;
1683 spin_unlock(&bo->lock);
1684 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1685 lazy, interruptible);
1686 if (unlikely(ret != 0)) {
1687 driver->sync_obj_unref(&sync_obj);
1688 spin_lock(&bo->lock);
1689 return ret;
1690 }
1691 spin_lock(&bo->lock);
1692 if (likely(bo->sync_obj == sync_obj &&
1693 bo->sync_obj_arg == sync_obj_arg)) {
1694 void *tmp_obj = bo->sync_obj;
1695 bo->sync_obj = NULL;
1696 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1697 &bo->priv_flags);
1698 spin_unlock(&bo->lock);
1699 driver->sync_obj_unref(&sync_obj);
1700 driver->sync_obj_unref(&tmp_obj);
1701 spin_lock(&bo->lock);
1702 } else {
1703 spin_unlock(&bo->lock);
1704 driver->sync_obj_unref(&sync_obj);
1705 spin_lock(&bo->lock);
1706 }
1707 }
1708 return 0;
1709 }
1710 EXPORT_SYMBOL(ttm_bo_wait);
1711
1712 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1713 {
1714 atomic_set(&bo->reserved, 0);
1715 wake_up_all(&bo->event_queue);
1716 }
1717
1718 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1719 bool no_wait)
1720 {
1721 int ret;
1722
1723 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1724 if (no_wait)
1725 return -EBUSY;
1726 else if (interruptible) {
1727 ret = wait_event_interruptible
1728 (bo->event_queue, atomic_read(&bo->reserved) == 0);
1729 if (unlikely(ret != 0))
1730 return ret;
1731 } else {
1732 wait_event(bo->event_queue,
1733 atomic_read(&bo->reserved) == 0);
1734 }
1735 }
1736 return 0;
1737 }
1738
1739 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1740 {
1741 int ret = 0;
1742
1743 /*
1744 * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1745 * makes sure the lru lists are updated.
1746 */
1747
1748 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1749 if (unlikely(ret != 0))
1750 return ret;
1751 spin_lock(&bo->lock);
1752 ret = ttm_bo_wait(bo, false, true, no_wait);
1753 spin_unlock(&bo->lock);
1754 if (likely(ret == 0))
1755 atomic_inc(&bo->cpu_writers);
1756 ttm_bo_unreserve(bo);
1757 return ret;
1758 }
1759 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1760
1761 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1762 {
1763 if (atomic_dec_and_test(&bo->cpu_writers))
1764 wake_up_all(&bo->event_queue);
1765 }
1766 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1767
1768 /**
1769 * A buffer object shrink method that tries to swap out the first
1770 * buffer object on the bo_global::swap_lru list.
1771 */
1772
1773 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1774 {
1775 struct ttm_bo_global *glob =
1776 container_of(shrink, struct ttm_bo_global, shrink);
1777 struct ttm_buffer_object *bo;
1778 int ret = -EBUSY;
1779 int put_count;
1780 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1781
1782 spin_lock(&glob->lru_lock);
1783 while (ret == -EBUSY) {
1784 if (unlikely(list_empty(&glob->swap_lru))) {
1785 spin_unlock(&glob->lru_lock);
1786 return -EBUSY;
1787 }
1788
1789 bo = list_first_entry(&glob->swap_lru,
1790 struct ttm_buffer_object, swap);
1791 kref_get(&bo->list_kref);
1792
1793 /**
1794 * Reserve buffer. Since we unlock while sleeping, we need
1795 * to re-check that nobody removed us from the swap-list while
1796 * we slept.
1797 */
1798
1799 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1800 if (unlikely(ret == -EBUSY)) {
1801 spin_unlock(&glob->lru_lock);
1802 ttm_bo_wait_unreserved(bo, false);
1803 kref_put(&bo->list_kref, ttm_bo_release_list);
1804 spin_lock(&glob->lru_lock);
1805 }
1806 }
1807
1808 BUG_ON(ret != 0);
1809 put_count = ttm_bo_del_from_lru(bo);
1810 spin_unlock(&glob->lru_lock);
1811
1812 while (put_count--)
1813 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1814
1815 /**
1816 * Wait for GPU, then move to system cached.
1817 */
1818
1819 spin_lock(&bo->lock);
1820 ret = ttm_bo_wait(bo, false, false, false);
1821 spin_unlock(&bo->lock);
1822
1823 if (unlikely(ret != 0))
1824 goto out;
1825
1826 if ((bo->mem.placement & swap_placement) != swap_placement) {
1827 struct ttm_mem_reg evict_mem;
1828
1829 evict_mem = bo->mem;
1830 evict_mem.mm_node = NULL;
1831 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1832 evict_mem.mem_type = TTM_PL_SYSTEM;
1833
1834 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1835 false, false);
1836 if (unlikely(ret != 0))
1837 goto out;
1838 }
1839
1840 ttm_bo_unmap_virtual(bo);
1841
1842 /**
1843 * Swap out. Buffer will be swapped in again as soon as
1844 * anyone tries to access a ttm page.
1845 */
1846
1847 if (bo->bdev->driver->swap_notify)
1848 bo->bdev->driver->swap_notify(bo);
1849
1850 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1851 out:
1852
1853 /**
1854 *
1855 * Unreserve without putting on LRU to avoid swapping out an
1856 * already swapped buffer.
1857 */
1858
1859 atomic_set(&bo->reserved, 0);
1860 wake_up_all(&bo->event_queue);
1861 kref_put(&bo->list_kref, ttm_bo_release_list);
1862 return ret;
1863 }
1864
1865 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1866 {
1867 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1868 ;
1869 }
Linux 2.6 libata-dev (mirror)