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drm/ttm: Fix potential ttm_mem_evict_first races.
[linux-2.6.git] / drivers / gpu / drm / ttm / ttm_bo.c
blob826240d4d675df2598e6657d16ad45a85cdabaf8
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_manager_debug(struct ttm_bo_global *glob,
75 struct ttm_mem_type_manager *man)
76 {
77 printk(KERN_ERR TTM_PFX " has_type: %d\n", man->has_type);
78 printk(KERN_ERR TTM_PFX " use_type: %d\n", man->use_type);
79 printk(KERN_ERR TTM_PFX " flags: 0x%08X\n", man->flags);
80 printk(KERN_ERR TTM_PFX " gpu_offset: 0x%08lX\n", man->gpu_offset);
81 printk(KERN_ERR TTM_PFX " io_offset: 0x%08lX\n", man->io_offset);
82 printk(KERN_ERR TTM_PFX " io_size: %ld\n", man->io_size);
83 printk(KERN_ERR TTM_PFX " size: %ld\n", (unsigned long)man->size);
84 printk(KERN_ERR TTM_PFX " available_caching: 0x%08X\n",
85 man->available_caching);
86 printk(KERN_ERR TTM_PFX " default_caching: 0x%08X\n",
87 man->default_caching);
88 spin_lock(&glob->lru_lock);
89 drm_mm_debug_table(&man->manager, TTM_PFX);
90 spin_unlock(&glob->lru_lock);
91 }
92
93 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
94 struct ttm_placement *placement)
95 {
96 struct ttm_bo_device *bdev = bo->bdev;
97 struct ttm_bo_global *glob = bo->glob;
98 struct ttm_mem_type_manager *man;
99 int i, ret, mem_type;
100
101 printk(KERN_ERR TTM_PFX "No space for %p (%ld pages, %ldK, %ldM)\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 man = &bdev->man[mem_type];
110 printk(KERN_ERR TTM_PFX " placement[%d]=0x%08X (%d)\n",
111 i, placement->placement[i], mem_type);
112 ttm_mem_type_manager_debug(glob, man);
113 }
114 }
115
116 static ssize_t ttm_bo_global_show(struct kobject *kobj,
117 struct attribute *attr,
118 char *buffer)
119 {
120 struct ttm_bo_global *glob =
121 container_of(kobj, struct ttm_bo_global, kobj);
122
123 return snprintf(buffer, PAGE_SIZE, "%lu\n",
124 (unsigned long) atomic_read(&glob->bo_count));
125 }
126
127 static struct attribute *ttm_bo_global_attrs[] = {
128 &ttm_bo_count,
129 NULL
130 };
131
132 static struct sysfs_ops ttm_bo_global_ops = {
133 .show = &ttm_bo_global_show
134 };
135
136 static struct kobj_type ttm_bo_glob_kobj_type = {
137 .release = &ttm_bo_global_kobj_release,
138 .sysfs_ops = &ttm_bo_global_ops,
139 .default_attrs = ttm_bo_global_attrs
140 };
141
142
143 static inline uint32_t ttm_bo_type_flags(unsigned type)
144 {
145 return 1 << (type);
146 }
147
148 static void ttm_bo_release_list(struct kref *list_kref)
149 {
150 struct ttm_buffer_object *bo =
151 container_of(list_kref, struct ttm_buffer_object, list_kref);
152 struct ttm_bo_device *bdev = bo->bdev;
153
154 BUG_ON(atomic_read(&bo->list_kref.refcount));
155 BUG_ON(atomic_read(&bo->kref.refcount));
156 BUG_ON(atomic_read(&bo->cpu_writers));
157 BUG_ON(bo->sync_obj != NULL);
158 BUG_ON(bo->mem.mm_node != NULL);
159 BUG_ON(!list_empty(&bo->lru));
160 BUG_ON(!list_empty(&bo->ddestroy));
161
162 if (bo->ttm)
163 ttm_tt_destroy(bo->ttm);
164 atomic_dec(&bo->glob->bo_count);
165 if (bo->destroy)
166 bo->destroy(bo);
167 else {
168 ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
169 kfree(bo);
170 }
171 }
172
173 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
174 {
175
176 if (interruptible) {
177 int ret = 0;
178
179 ret = wait_event_interruptible(bo->event_queue,
180 atomic_read(&bo->reserved) == 0);
181 if (unlikely(ret != 0))
182 return ret;
183 } else {
184 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
185 }
186 return 0;
187 }
188 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
189
190 static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
191 {
192 struct ttm_bo_device *bdev = bo->bdev;
193 struct ttm_mem_type_manager *man;
194
195 BUG_ON(!atomic_read(&bo->reserved));
196
197 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
198
199 BUG_ON(!list_empty(&bo->lru));
200
201 man = &bdev->man[bo->mem.mem_type];
202 list_add_tail(&bo->lru, &man->lru);
203 kref_get(&bo->list_kref);
204
205 if (bo->ttm != NULL) {
206 list_add_tail(&bo->swap, &bo->glob->swap_lru);
207 kref_get(&bo->list_kref);
208 }
209 }
210 }
211
212 /**
213 * Call with the lru_lock held.
214 */
215
216 static int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
217 {
218 int put_count = 0;
219
220 if (!list_empty(&bo->swap)) {
221 list_del_init(&bo->swap);
222 ++put_count;
223 }
224 if (!list_empty(&bo->lru)) {
225 list_del_init(&bo->lru);
226 ++put_count;
227 }
228
229 /*
230 * TODO: Add a driver hook to delete from
231 * driver-specific LRU's here.
232 */
233
234 return put_count;
235 }
236
237 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
238 bool interruptible,
239 bool no_wait, bool use_sequence, uint32_t sequence)
240 {
241 struct ttm_bo_global *glob = bo->glob;
242 int ret;
243
244 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
245 if (use_sequence && bo->seq_valid &&
246 (sequence - bo->val_seq < (1 << 31))) {
247 return -EAGAIN;
248 }
249
250 if (no_wait)
251 return -EBUSY;
252
253 spin_unlock(&glob->lru_lock);
254 ret = ttm_bo_wait_unreserved(bo, interruptible);
255 spin_lock(&glob->lru_lock);
256
257 if (unlikely(ret))
258 return ret;
259 }
260
261 if (use_sequence) {
262 bo->val_seq = sequence;
263 bo->seq_valid = true;
264 } else {
265 bo->seq_valid = false;
266 }
267
268 return 0;
269 }
270 EXPORT_SYMBOL(ttm_bo_reserve);
271
272 static void ttm_bo_ref_bug(struct kref *list_kref)
273 {
274 BUG();
275 }
276
277 int ttm_bo_reserve(struct ttm_buffer_object *bo,
278 bool interruptible,
279 bool no_wait, bool use_sequence, uint32_t sequence)
280 {
281 struct ttm_bo_global *glob = bo->glob;
282 int put_count = 0;
283 int ret;
284
285 spin_lock(&glob->lru_lock);
286 ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
287 sequence);
288 if (likely(ret == 0))
289 put_count = ttm_bo_del_from_lru(bo);
290 spin_unlock(&glob->lru_lock);
291
292 while (put_count--)
293 kref_put(&bo->list_kref, ttm_bo_ref_bug);
294
295 return ret;
296 }
297
298 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
299 {
300 struct ttm_bo_global *glob = bo->glob;
301
302 spin_lock(&glob->lru_lock);
303 ttm_bo_add_to_lru(bo);
304 atomic_set(&bo->reserved, 0);
305 wake_up_all(&bo->event_queue);
306 spin_unlock(&glob->lru_lock);
307 }
308 EXPORT_SYMBOL(ttm_bo_unreserve);
309
310 /*
311 * Call bo->mutex locked.
312 */
313 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
314 {
315 struct ttm_bo_device *bdev = bo->bdev;
316 struct ttm_bo_global *glob = bo->glob;
317 int ret = 0;
318 uint32_t page_flags = 0;
319
320 TTM_ASSERT_LOCKED(&bo->mutex);
321 bo->ttm = NULL;
322
323 if (bdev->need_dma32)
324 page_flags |= TTM_PAGE_FLAG_DMA32;
325
326 switch (bo->type) {
327 case ttm_bo_type_device:
328 if (zero_alloc)
329 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
330 case ttm_bo_type_kernel:
331 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
332 page_flags, glob->dummy_read_page);
333 if (unlikely(bo->ttm == NULL))
334 ret = -ENOMEM;
335 break;
336 case ttm_bo_type_user:
337 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
338 page_flags | TTM_PAGE_FLAG_USER,
339 glob->dummy_read_page);
340 if (unlikely(bo->ttm == NULL)) {
341 ret = -ENOMEM;
342 break;
343 }
344
345 ret = ttm_tt_set_user(bo->ttm, current,
346 bo->buffer_start, bo->num_pages);
347 if (unlikely(ret != 0))
348 ttm_tt_destroy(bo->ttm);
349 break;
350 default:
351 printk(KERN_ERR TTM_PFX "Illegal buffer object type\n");
352 ret = -EINVAL;
353 break;
354 }
355
356 return ret;
357 }
358
359 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
360 struct ttm_mem_reg *mem,
361 bool evict, bool interruptible, bool no_wait)
362 {
363 struct ttm_bo_device *bdev = bo->bdev;
364 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
365 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
366 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
367 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
368 int ret = 0;
369
370 if (old_is_pci || new_is_pci ||
371 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
372 ttm_bo_unmap_virtual(bo);
373
374 /*
375 * Create and bind a ttm if required.
376 */
377
378 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
379 ret = ttm_bo_add_ttm(bo, false);
380 if (ret)
381 goto out_err;
382
383 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
384 if (ret)
385 goto out_err;
386
387 if (mem->mem_type != TTM_PL_SYSTEM) {
388 ret = ttm_tt_bind(bo->ttm, mem);
389 if (ret)
390 goto out_err;
391 }
392
393 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
394 bo->mem = *mem;
395 mem->mm_node = NULL;
396 goto moved;
397 }
398
399 }
400
401 if (bdev->driver->move_notify)
402 bdev->driver->move_notify(bo, mem);
403
404 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
405 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
406 ret = ttm_bo_move_ttm(bo, evict, no_wait, mem);
407 else if (bdev->driver->move)
408 ret = bdev->driver->move(bo, evict, interruptible,
409 no_wait, mem);
410 else
411 ret = ttm_bo_move_memcpy(bo, evict, no_wait, mem);
412
413 if (ret)
414 goto out_err;
415
416 moved:
417 if (bo->evicted) {
418 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
419 if (ret)
420 printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
421 bo->evicted = false;
422 }
423
424 if (bo->mem.mm_node) {
425 spin_lock(&bo->lock);
426 bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
427 bdev->man[bo->mem.mem_type].gpu_offset;
428 bo->cur_placement = bo->mem.placement;
429 spin_unlock(&bo->lock);
430 }
431
432 return 0;
433
434 out_err:
435 new_man = &bdev->man[bo->mem.mem_type];
436 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
437 ttm_tt_unbind(bo->ttm);
438 ttm_tt_destroy(bo->ttm);
439 bo->ttm = NULL;
440 }
441
442 return ret;
443 }
444
445 /**
446 * If bo idle, remove from delayed- and lru lists, and unref.
447 * If not idle, and already on delayed list, do nothing.
448 * If not idle, and not on delayed list, put on delayed list,
449 * up the list_kref and schedule a delayed list check.
450 */
451
452 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
453 {
454 struct ttm_bo_device *bdev = bo->bdev;
455 struct ttm_bo_global *glob = bo->glob;
456 struct ttm_bo_driver *driver = bdev->driver;
457 int ret;
458
459 spin_lock(&bo->lock);
460 (void) ttm_bo_wait(bo, false, false, !remove_all);
461
462 if (!bo->sync_obj) {
463 int put_count;
464
465 spin_unlock(&bo->lock);
466
467 spin_lock(&glob->lru_lock);
468 put_count = ttm_bo_del_from_lru(bo);
469
470 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
471 BUG_ON(ret);
472 if (bo->ttm)
473 ttm_tt_unbind(bo->ttm);
474
475 if (!list_empty(&bo->ddestroy)) {
476 list_del_init(&bo->ddestroy);
477 ++put_count;
478 }
479 if (bo->mem.mm_node) {
480 bo->mem.mm_node->private = NULL;
481 drm_mm_put_block(bo->mem.mm_node);
482 bo->mem.mm_node = NULL;
483 }
484 spin_unlock(&glob->lru_lock);
485
486 atomic_set(&bo->reserved, 0);
487
488 while (put_count--)
489 kref_put(&bo->list_kref, ttm_bo_ref_bug);
490
491 return 0;
492 }
493
494 spin_lock(&glob->lru_lock);
495 if (list_empty(&bo->ddestroy)) {
496 void *sync_obj = bo->sync_obj;
497 void *sync_obj_arg = bo->sync_obj_arg;
498
499 kref_get(&bo->list_kref);
500 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
501 spin_unlock(&glob->lru_lock);
502 spin_unlock(&bo->lock);
503
504 if (sync_obj)
505 driver->sync_obj_flush(sync_obj, sync_obj_arg);
506 schedule_delayed_work(&bdev->wq,
507 ((HZ / 100) < 1) ? 1 : HZ / 100);
508 ret = 0;
509
510 } else {
511 spin_unlock(&glob->lru_lock);
512 spin_unlock(&bo->lock);
513 ret = -EBUSY;
514 }
515
516 return ret;
517 }
518
519 /**
520 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
521 * encountered buffers.
522 */
523
524 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
525 {
526 struct ttm_bo_global *glob = bdev->glob;
527 struct ttm_buffer_object *entry, *nentry;
528 struct list_head *list, *next;
529 int ret;
530
531 spin_lock(&glob->lru_lock);
532 list_for_each_safe(list, next, &bdev->ddestroy) {
533 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
534 nentry = NULL;
535
536 /*
537 * Protect the next list entry from destruction while we
538 * unlock the lru_lock.
539 */
540
541 if (next != &bdev->ddestroy) {
542 nentry = list_entry(next, struct ttm_buffer_object,
543 ddestroy);
544 kref_get(&nentry->list_kref);
545 }
546 kref_get(&entry->list_kref);
547
548 spin_unlock(&glob->lru_lock);
549 ret = ttm_bo_cleanup_refs(entry, remove_all);
550 kref_put(&entry->list_kref, ttm_bo_release_list);
551
552 spin_lock(&glob->lru_lock);
553 if (nentry) {
554 bool next_onlist = !list_empty(next);
555 spin_unlock(&glob->lru_lock);
556 kref_put(&nentry->list_kref, ttm_bo_release_list);
557 spin_lock(&glob->lru_lock);
558 /*
559 * Someone might have raced us and removed the
560 * next entry from the list. We don't bother restarting
561 * list traversal.
562 */
563
564 if (!next_onlist)
565 break;
566 }
567 if (ret)
568 break;
569 }
570 ret = !list_empty(&bdev->ddestroy);
571 spin_unlock(&glob->lru_lock);
572
573 return ret;
574 }
575
576 static void ttm_bo_delayed_workqueue(struct work_struct *work)
577 {
578 struct ttm_bo_device *bdev =
579 container_of(work, struct ttm_bo_device, wq.work);
580
581 if (ttm_bo_delayed_delete(bdev, false)) {
582 schedule_delayed_work(&bdev->wq,
583 ((HZ / 100) < 1) ? 1 : HZ / 100);
584 }
585 }
586
587 static void ttm_bo_release(struct kref *kref)
588 {
589 struct ttm_buffer_object *bo =
590 container_of(kref, struct ttm_buffer_object, kref);
591 struct ttm_bo_device *bdev = bo->bdev;
592
593 if (likely(bo->vm_node != NULL)) {
594 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
595 drm_mm_put_block(bo->vm_node);
596 bo->vm_node = NULL;
597 }
598 write_unlock(&bdev->vm_lock);
599 ttm_bo_cleanup_refs(bo, false);
600 kref_put(&bo->list_kref, ttm_bo_release_list);
601 write_lock(&bdev->vm_lock);
602 }
603
604 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
605 {
606 struct ttm_buffer_object *bo = *p_bo;
607 struct ttm_bo_device *bdev = bo->bdev;
608
609 *p_bo = NULL;
610 write_lock(&bdev->vm_lock);
611 kref_put(&bo->kref, ttm_bo_release);
612 write_unlock(&bdev->vm_lock);
613 }
614 EXPORT_SYMBOL(ttm_bo_unref);
615
616 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
617 bool no_wait)
618 {
619 struct ttm_bo_device *bdev = bo->bdev;
620 struct ttm_bo_global *glob = bo->glob;
621 struct ttm_mem_reg evict_mem;
622 struct ttm_placement placement;
623 int ret = 0;
624
625 spin_lock(&bo->lock);
626 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
627 spin_unlock(&bo->lock);
628
629 if (unlikely(ret != 0)) {
630 if (ret != -ERESTARTSYS) {
631 printk(KERN_ERR TTM_PFX
632 "Failed to expire sync object before "
633 "buffer eviction.\n");
634 }
635 goto out;
636 }
637
638 BUG_ON(!atomic_read(&bo->reserved));
639
640 evict_mem = bo->mem;
641 evict_mem.mm_node = NULL;
642
643 placement.fpfn = 0;
644 placement.lpfn = 0;
645 placement.num_placement = 0;
646 placement.num_busy_placement = 0;
647 bdev->driver->evict_flags(bo, &placement);
648 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
649 no_wait);
650 if (ret) {
651 if (ret != -ERESTARTSYS) {
652 printk(KERN_ERR TTM_PFX
653 "Failed to find memory space for "
654 "buffer 0x%p eviction.\n", bo);
655 ttm_bo_mem_space_debug(bo, &placement);
656 }
657 goto out;
658 }
659
660 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
661 no_wait);
662 if (ret) {
663 if (ret != -ERESTARTSYS)
664 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
665 spin_lock(&glob->lru_lock);
666 if (evict_mem.mm_node) {
667 evict_mem.mm_node->private = NULL;
668 drm_mm_put_block(evict_mem.mm_node);
669 evict_mem.mm_node = NULL;
670 }
671 spin_unlock(&glob->lru_lock);
672 goto out;
673 }
674 bo->evicted = true;
675 out:
676 return ret;
677 }
678
679 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
680 uint32_t mem_type,
681 bool interruptible, bool no_wait)
682 {
683 struct ttm_bo_global *glob = bdev->glob;
684 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
685 struct ttm_buffer_object *bo;
686 int ret, put_count = 0;
687
688 retry:
689 spin_lock(&glob->lru_lock);
690 if (list_empty(&man->lru)) {
691 spin_unlock(&glob->lru_lock);
692 return -EBUSY;
693 }
694
695 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
696 kref_get(&bo->list_kref);
697
698 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
699
700 if (unlikely(ret == -EBUSY)) {
701 spin_unlock(&glob->lru_lock);
702 if (likely(!no_wait))
703 ret = ttm_bo_wait_unreserved(bo, interruptible);
704
705 kref_put(&bo->list_kref, ttm_bo_release_list);
706
707 /**
708 * We *need* to retry after releasing the lru lock.
709 */
710
711 if (unlikely(ret != 0))
712 return ret;
713 goto retry;
714 }
715
716 put_count = ttm_bo_del_from_lru(bo);
717 spin_unlock(&glob->lru_lock);
718
719 BUG_ON(ret != 0);
720
721 while (put_count--)
722 kref_put(&bo->list_kref, ttm_bo_ref_bug);
723
724 ret = ttm_bo_evict(bo, interruptible, no_wait);
725 ttm_bo_unreserve(bo);
726
727 kref_put(&bo->list_kref, ttm_bo_release_list);
728 return ret;
729 }
730
731 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
732 struct ttm_mem_type_manager *man,
733 struct ttm_placement *placement,
734 struct ttm_mem_reg *mem,
735 struct drm_mm_node **node)
736 {
737 struct ttm_bo_global *glob = bo->glob;
738 unsigned long lpfn;
739 int ret;
740
741 lpfn = placement->lpfn;
742 if (!lpfn)
743 lpfn = man->size;
744 *node = NULL;
745 do {
746 ret = drm_mm_pre_get(&man->manager);
747 if (unlikely(ret))
748 return ret;
749
750 spin_lock(&glob->lru_lock);
751 *node = drm_mm_search_free_in_range(&man->manager,
752 mem->num_pages, mem->page_alignment,
753 placement->fpfn, lpfn, 1);
754 if (unlikely(*node == NULL)) {
755 spin_unlock(&glob->lru_lock);
756 return 0;
757 }
758 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
759 mem->page_alignment,
760 placement->fpfn,
761 lpfn);
762 spin_unlock(&glob->lru_lock);
763 } while (*node == NULL);
764 return 0;
765 }
766
767 /**
768 * Repeatedly evict memory from the LRU for @mem_type until we create enough
769 * space, or we've evicted everything and there isn't enough space.
770 */
771 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
772 uint32_t mem_type,
773 struct ttm_placement *placement,
774 struct ttm_mem_reg *mem,
775 bool interruptible, bool no_wait)
776 {
777 struct ttm_bo_device *bdev = bo->bdev;
778 struct ttm_bo_global *glob = bdev->glob;
779 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
780 struct drm_mm_node *node;
781 int ret;
782
783 do {
784 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
785 if (unlikely(ret != 0))
786 return ret;
787 if (node)
788 break;
789 spin_lock(&glob->lru_lock);
790 if (list_empty(&man->lru)) {
791 spin_unlock(&glob->lru_lock);
792 break;
793 }
794 spin_unlock(&glob->lru_lock);
795 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
796 no_wait);
797 if (unlikely(ret != 0))
798 return ret;
799 } while (1);
800 if (node == NULL)
801 return -ENOMEM;
802 mem->mm_node = node;
803 mem->mem_type = mem_type;
804 return 0;
805 }
806
807 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
808 uint32_t cur_placement,
809 uint32_t proposed_placement)
810 {
811 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
812 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
813
814 /**
815 * Keep current caching if possible.
816 */
817
818 if ((cur_placement & caching) != 0)
819 result |= (cur_placement & caching);
820 else if ((man->default_caching & caching) != 0)
821 result |= man->default_caching;
822 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
823 result |= TTM_PL_FLAG_CACHED;
824 else if ((TTM_PL_FLAG_WC & caching) != 0)
825 result |= TTM_PL_FLAG_WC;
826 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
827 result |= TTM_PL_FLAG_UNCACHED;
828
829 return result;
830 }
831
832 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
833 bool disallow_fixed,
834 uint32_t mem_type,
835 uint32_t proposed_placement,
836 uint32_t *masked_placement)
837 {
838 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
839
840 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
841 return false;
842
843 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
844 return false;
845
846 if ((proposed_placement & man->available_caching) == 0)
847 return false;
848
849 cur_flags |= (proposed_placement & man->available_caching);
850
851 *masked_placement = cur_flags;
852 return true;
853 }
854
855 /**
856 * Creates space for memory region @mem according to its type.
857 *
858 * This function first searches for free space in compatible memory types in
859 * the priority order defined by the driver. If free space isn't found, then
860 * ttm_bo_mem_force_space is attempted in priority order to evict and find
861 * space.
862 */
863 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
864 struct ttm_placement *placement,
865 struct ttm_mem_reg *mem,
866 bool interruptible, bool no_wait)
867 {
868 struct ttm_bo_device *bdev = bo->bdev;
869 struct ttm_mem_type_manager *man;
870 uint32_t mem_type = TTM_PL_SYSTEM;
871 uint32_t cur_flags = 0;
872 bool type_found = false;
873 bool type_ok = false;
874 bool has_erestartsys = false;
875 struct drm_mm_node *node = NULL;
876 int i, ret;
877
878 mem->mm_node = NULL;
879 for (i = 0; i < placement->num_placement; ++i) {
880 ret = ttm_mem_type_from_flags(placement->placement[i],
881 &mem_type);
882 if (ret)
883 return ret;
884 man = &bdev->man[mem_type];
885
886 type_ok = ttm_bo_mt_compatible(man,
887 bo->type == ttm_bo_type_user,
888 mem_type,
889 placement->placement[i],
890 &cur_flags);
891
892 if (!type_ok)
893 continue;
894
895 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
896 cur_flags);
897 /*
898 * Use the access and other non-mapping-related flag bits from
899 * the memory placement flags to the current flags
900 */
901 ttm_flag_masked(&cur_flags, placement->placement[i],
902 ~TTM_PL_MASK_MEMTYPE);
903
904 if (mem_type == TTM_PL_SYSTEM)
905 break;
906
907 if (man->has_type && man->use_type) {
908 type_found = true;
909 ret = ttm_bo_man_get_node(bo, man, placement, mem,
910 &node);
911 if (unlikely(ret))
912 return ret;
913 }
914 if (node)
915 break;
916 }
917
918 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
919 mem->mm_node = node;
920 mem->mem_type = mem_type;
921 mem->placement = cur_flags;
922 if (node)
923 node->private = bo;
924 return 0;
925 }
926
927 if (!type_found)
928 return -EINVAL;
929
930 for (i = 0; i < placement->num_busy_placement; ++i) {
931 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
932 &mem_type);
933 if (ret)
934 return ret;
935 man = &bdev->man[mem_type];
936 if (!man->has_type)
937 continue;
938 if (!ttm_bo_mt_compatible(man,
939 bo->type == ttm_bo_type_user,
940 mem_type,
941 placement->busy_placement[i],
942 &cur_flags))
943 continue;
944
945 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
946 cur_flags);
947 /*
948 * Use the access and other non-mapping-related flag bits from
949 * the memory placement flags to the current flags
950 */
951 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
952 ~TTM_PL_MASK_MEMTYPE);
953
954 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
955 interruptible, no_wait);
956 if (ret == 0 && mem->mm_node) {
957 mem->placement = cur_flags;
958 mem->mm_node->private = bo;
959 return 0;
960 }
961 if (ret == -ERESTARTSYS)
962 has_erestartsys = true;
963 }
964 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
965 return ret;
966 }
967 EXPORT_SYMBOL(ttm_bo_mem_space);
968
969 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
970 {
971 if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
972 return -EBUSY;
973
974 return wait_event_interruptible(bo->event_queue,
975 atomic_read(&bo->cpu_writers) == 0);
976 }
977 EXPORT_SYMBOL(ttm_bo_wait_cpu);
978
979 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
980 struct ttm_placement *placement,
981 bool interruptible, bool no_wait)
982 {
983 struct ttm_bo_global *glob = bo->glob;
984 int ret = 0;
985 struct ttm_mem_reg mem;
986
987 BUG_ON(!atomic_read(&bo->reserved));
988
989 /*
990 * FIXME: It's possible to pipeline buffer moves.
991 * Have the driver move function wait for idle when necessary,
992 * instead of doing it here.
993 */
994 spin_lock(&bo->lock);
995 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
996 spin_unlock(&bo->lock);
997 if (ret)
998 return ret;
999 mem.num_pages = bo->num_pages;
1000 mem.size = mem.num_pages << PAGE_SHIFT;
1001 mem.page_alignment = bo->mem.page_alignment;
1002 /*
1003 * Determine where to move the buffer.
1004 */
1005 ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait);
1006 if (ret)
1007 goto out_unlock;
1008 ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait);
1009 out_unlock:
1010 if (ret && mem.mm_node) {
1011 spin_lock(&glob->lru_lock);
1012 mem.mm_node->private = NULL;
1013 drm_mm_put_block(mem.mm_node);
1014 spin_unlock(&glob->lru_lock);
1015 }
1016 return ret;
1017 }
1018
1019 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1020 struct ttm_mem_reg *mem)
1021 {
1022 int i;
1023
1024 for (i = 0; i < placement->num_placement; i++) {
1025 if ((placement->placement[i] & mem->placement &
1026 TTM_PL_MASK_CACHING) &&
1027 (placement->placement[i] & mem->placement &
1028 TTM_PL_MASK_MEM))
1029 return i;
1030 }
1031 return -1;
1032 }
1033
1034 int ttm_bo_validate(struct ttm_buffer_object *bo,
1035 struct ttm_placement *placement,
1036 bool interruptible, bool no_wait)
1037 {
1038 int ret;
1039
1040 BUG_ON(!atomic_read(&bo->reserved));
1041 /* Check that range is valid */
1042 if (placement->lpfn || placement->fpfn)
1043 if (placement->fpfn > placement->lpfn ||
1044 (placement->lpfn - placement->fpfn) < bo->num_pages)
1045 return -EINVAL;
1046 /*
1047 * Check whether we need to move buffer.
1048 */
1049 ret = ttm_bo_mem_compat(placement, &bo->mem);
1050 if (ret < 0) {
1051 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait);
1052 if (ret)
1053 return ret;
1054 } else {
1055 /*
1056 * Use the access and other non-mapping-related flag bits from
1057 * the compatible memory placement flags to the active flags
1058 */
1059 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1060 ~TTM_PL_MASK_MEMTYPE);
1061 }
1062 /*
1063 * We might need to add a TTM.
1064 */
1065 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1066 ret = ttm_bo_add_ttm(bo, true);
1067 if (ret)
1068 return ret;
1069 }
1070 return 0;
1071 }
1072 EXPORT_SYMBOL(ttm_bo_validate);
1073
1074 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1075 struct ttm_placement *placement)
1076 {
1077 int i;
1078
1079 if (placement->fpfn || placement->lpfn) {
1080 if (bo->mem.num_pages > (placement->lpfn - placement->fpfn)) {
1081 printk(KERN_ERR TTM_PFX "Page number range to small "
1082 "Need %lu pages, range is [%u, %u]\n",
1083 bo->mem.num_pages, placement->fpfn,
1084 placement->lpfn);
1085 return -EINVAL;
1086 }
1087 }
1088 for (i = 0; i < placement->num_placement; i++) {
1089 if (!capable(CAP_SYS_ADMIN)) {
1090 if (placement->placement[i] & TTM_PL_FLAG_NO_EVICT) {
1091 printk(KERN_ERR TTM_PFX "Need to be root to "
1092 "modify NO_EVICT status.\n");
1093 return -EINVAL;
1094 }
1095 }
1096 }
1097 for (i = 0; i < placement->num_busy_placement; i++) {
1098 if (!capable(CAP_SYS_ADMIN)) {
1099 if (placement->busy_placement[i] & TTM_PL_FLAG_NO_EVICT) {
1100 printk(KERN_ERR TTM_PFX "Need to be root to "
1101 "modify NO_EVICT status.\n");
1102 return -EINVAL;
1103 }
1104 }
1105 }
1106 return 0;
1107 }
1108
1109 int ttm_bo_init(struct ttm_bo_device *bdev,
1110 struct ttm_buffer_object *bo,
1111 unsigned long size,
1112 enum ttm_bo_type type,
1113 struct ttm_placement *placement,
1114 uint32_t page_alignment,
1115 unsigned long buffer_start,
1116 bool interruptible,
1117 struct file *persistant_swap_storage,
1118 size_t acc_size,
1119 void (*destroy) (struct ttm_buffer_object *))
1120 {
1121 int ret = 0;
1122 unsigned long num_pages;
1123
1124 size += buffer_start & ~PAGE_MASK;
1125 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1126 if (num_pages == 0) {
1127 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1128 return -EINVAL;
1129 }
1130 bo->destroy = destroy;
1131
1132 spin_lock_init(&bo->lock);
1133 kref_init(&bo->kref);
1134 kref_init(&bo->list_kref);
1135 atomic_set(&bo->cpu_writers, 0);
1136 atomic_set(&bo->reserved, 1);
1137 init_waitqueue_head(&bo->event_queue);
1138 INIT_LIST_HEAD(&bo->lru);
1139 INIT_LIST_HEAD(&bo->ddestroy);
1140 INIT_LIST_HEAD(&bo->swap);
1141 bo->bdev = bdev;
1142 bo->glob = bdev->glob;
1143 bo->type = type;
1144 bo->num_pages = num_pages;
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 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1848 out:
1849
1850 /**
1851 *
1852 * Unreserve without putting on LRU to avoid swapping out an
1853 * already swapped buffer.
1854 */
1855
1856 atomic_set(&bo->reserved, 0);
1857 wake_up_all(&bo->event_queue);
1858 kref_put(&bo->list_kref, ttm_bo_release_list);
1859 return ret;
1860 }
1861
1862 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1863 {
1864 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1865 ;
1866 }
Linus' kernel tree