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Linux 2.6.33-rc6
[cris-mirror.git] / drivers / gpu / drm / ttm / ttm_bo.c
blob1a3e909b7bba6e926cd5aa3b90e5a51419b1db03
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 } else
430 bo->offset = 0;
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 = NULL;
528 int ret = 0;
529
530 spin_lock(&glob->lru_lock);
531 if (list_empty(&bdev->ddestroy))
532 goto out_unlock;
533
534 entry = list_first_entry(&bdev->ddestroy,
535 struct ttm_buffer_object, ddestroy);
536 kref_get(&entry->list_kref);
537
538 for (;;) {
539 struct ttm_buffer_object *nentry = NULL;
540
541 if (entry->ddestroy.next != &bdev->ddestroy) {
542 nentry = list_first_entry(&entry->ddestroy,
543 struct ttm_buffer_object, ddestroy);
544 kref_get(&nentry->list_kref);
545 }
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 entry = nentry;
551
552 if (ret || !entry)
553 goto out;
554
555 spin_lock(&glob->lru_lock);
556 if (list_empty(&entry->ddestroy))
557 break;
558 }
559
560 out_unlock:
561 spin_unlock(&glob->lru_lock);
562 out:
563 if (entry)
564 kref_put(&entry->list_kref, ttm_bo_release_list);
565 return ret;
566 }
567
568 static void ttm_bo_delayed_workqueue(struct work_struct *work)
569 {
570 struct ttm_bo_device *bdev =
571 container_of(work, struct ttm_bo_device, wq.work);
572
573 if (ttm_bo_delayed_delete(bdev, false)) {
574 schedule_delayed_work(&bdev->wq,
575 ((HZ / 100) < 1) ? 1 : HZ / 100);
576 }
577 }
578
579 static void ttm_bo_release(struct kref *kref)
580 {
581 struct ttm_buffer_object *bo =
582 container_of(kref, struct ttm_buffer_object, kref);
583 struct ttm_bo_device *bdev = bo->bdev;
584
585 if (likely(bo->vm_node != NULL)) {
586 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
587 drm_mm_put_block(bo->vm_node);
588 bo->vm_node = NULL;
589 }
590 write_unlock(&bdev->vm_lock);
591 ttm_bo_cleanup_refs(bo, false);
592 kref_put(&bo->list_kref, ttm_bo_release_list);
593 write_lock(&bdev->vm_lock);
594 }
595
596 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
597 {
598 struct ttm_buffer_object *bo = *p_bo;
599 struct ttm_bo_device *bdev = bo->bdev;
600
601 *p_bo = NULL;
602 write_lock(&bdev->vm_lock);
603 kref_put(&bo->kref, ttm_bo_release);
604 write_unlock(&bdev->vm_lock);
605 }
606 EXPORT_SYMBOL(ttm_bo_unref);
607
608 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
609 bool no_wait)
610 {
611 struct ttm_bo_device *bdev = bo->bdev;
612 struct ttm_bo_global *glob = bo->glob;
613 struct ttm_mem_reg evict_mem;
614 struct ttm_placement placement;
615 int ret = 0;
616
617 spin_lock(&bo->lock);
618 ret = ttm_bo_wait(bo, false, interruptible, no_wait);
619 spin_unlock(&bo->lock);
620
621 if (unlikely(ret != 0)) {
622 if (ret != -ERESTARTSYS) {
623 printk(KERN_ERR TTM_PFX
624 "Failed to expire sync object before "
625 "buffer eviction.\n");
626 }
627 goto out;
628 }
629
630 BUG_ON(!atomic_read(&bo->reserved));
631
632 evict_mem = bo->mem;
633 evict_mem.mm_node = NULL;
634
635 placement.fpfn = 0;
636 placement.lpfn = 0;
637 placement.num_placement = 0;
638 placement.num_busy_placement = 0;
639 bdev->driver->evict_flags(bo, &placement);
640 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
641 no_wait);
642 if (ret) {
643 if (ret != -ERESTARTSYS) {
644 printk(KERN_ERR TTM_PFX
645 "Failed to find memory space for "
646 "buffer 0x%p eviction.\n", bo);
647 ttm_bo_mem_space_debug(bo, &placement);
648 }
649 goto out;
650 }
651
652 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
653 no_wait);
654 if (ret) {
655 if (ret != -ERESTARTSYS)
656 printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
657 spin_lock(&glob->lru_lock);
658 if (evict_mem.mm_node) {
659 evict_mem.mm_node->private = NULL;
660 drm_mm_put_block(evict_mem.mm_node);
661 evict_mem.mm_node = NULL;
662 }
663 spin_unlock(&glob->lru_lock);
664 goto out;
665 }
666 bo->evicted = true;
667 out:
668 return ret;
669 }
670
671 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
672 uint32_t mem_type,
673 bool interruptible, bool no_wait)
674 {
675 struct ttm_bo_global *glob = bdev->glob;
676 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
677 struct ttm_buffer_object *bo;
678 int ret, put_count = 0;
679
680 retry:
681 spin_lock(&glob->lru_lock);
682 if (list_empty(&man->lru)) {
683 spin_unlock(&glob->lru_lock);
684 return -EBUSY;
685 }
686
687 bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
688 kref_get(&bo->list_kref);
689
690 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
691
692 if (unlikely(ret == -EBUSY)) {
693 spin_unlock(&glob->lru_lock);
694 if (likely(!no_wait))
695 ret = ttm_bo_wait_unreserved(bo, interruptible);
696
697 kref_put(&bo->list_kref, ttm_bo_release_list);
698
699 /**
700 * We *need* to retry after releasing the lru lock.
701 */
702
703 if (unlikely(ret != 0))
704 return ret;
705 goto retry;
706 }
707
708 put_count = ttm_bo_del_from_lru(bo);
709 spin_unlock(&glob->lru_lock);
710
711 BUG_ON(ret != 0);
712
713 while (put_count--)
714 kref_put(&bo->list_kref, ttm_bo_ref_bug);
715
716 ret = ttm_bo_evict(bo, interruptible, no_wait);
717 ttm_bo_unreserve(bo);
718
719 kref_put(&bo->list_kref, ttm_bo_release_list);
720 return ret;
721 }
722
723 static int ttm_bo_man_get_node(struct ttm_buffer_object *bo,
724 struct ttm_mem_type_manager *man,
725 struct ttm_placement *placement,
726 struct ttm_mem_reg *mem,
727 struct drm_mm_node **node)
728 {
729 struct ttm_bo_global *glob = bo->glob;
730 unsigned long lpfn;
731 int ret;
732
733 lpfn = placement->lpfn;
734 if (!lpfn)
735 lpfn = man->size;
736 *node = NULL;
737 do {
738 ret = drm_mm_pre_get(&man->manager);
739 if (unlikely(ret))
740 return ret;
741
742 spin_lock(&glob->lru_lock);
743 *node = drm_mm_search_free_in_range(&man->manager,
744 mem->num_pages, mem->page_alignment,
745 placement->fpfn, lpfn, 1);
746 if (unlikely(*node == NULL)) {
747 spin_unlock(&glob->lru_lock);
748 return 0;
749 }
750 *node = drm_mm_get_block_atomic_range(*node, mem->num_pages,
751 mem->page_alignment,
752 placement->fpfn,
753 lpfn);
754 spin_unlock(&glob->lru_lock);
755 } while (*node == NULL);
756 return 0;
757 }
758
759 /**
760 * Repeatedly evict memory from the LRU for @mem_type until we create enough
761 * space, or we've evicted everything and there isn't enough space.
762 */
763 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
764 uint32_t mem_type,
765 struct ttm_placement *placement,
766 struct ttm_mem_reg *mem,
767 bool interruptible, bool no_wait)
768 {
769 struct ttm_bo_device *bdev = bo->bdev;
770 struct ttm_bo_global *glob = bdev->glob;
771 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
772 struct drm_mm_node *node;
773 int ret;
774
775 do {
776 ret = ttm_bo_man_get_node(bo, man, placement, mem, &node);
777 if (unlikely(ret != 0))
778 return ret;
779 if (node)
780 break;
781 spin_lock(&glob->lru_lock);
782 if (list_empty(&man->lru)) {
783 spin_unlock(&glob->lru_lock);
784 break;
785 }
786 spin_unlock(&glob->lru_lock);
787 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
788 no_wait);
789 if (unlikely(ret != 0))
790 return ret;
791 } while (1);
792 if (node == NULL)
793 return -ENOMEM;
794 mem->mm_node = node;
795 mem->mem_type = mem_type;
796 return 0;
797 }
798
799 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
800 uint32_t cur_placement,
801 uint32_t proposed_placement)
802 {
803 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
804 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
805
806 /**
807 * Keep current caching if possible.
808 */
809
810 if ((cur_placement & caching) != 0)
811 result |= (cur_placement & caching);
812 else if ((man->default_caching & caching) != 0)
813 result |= man->default_caching;
814 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
815 result |= TTM_PL_FLAG_CACHED;
816 else if ((TTM_PL_FLAG_WC & caching) != 0)
817 result |= TTM_PL_FLAG_WC;
818 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
819 result |= TTM_PL_FLAG_UNCACHED;
820
821 return result;
822 }
823
824 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
825 bool disallow_fixed,
826 uint32_t mem_type,
827 uint32_t proposed_placement,
828 uint32_t *masked_placement)
829 {
830 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
831
832 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
833 return false;
834
835 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
836 return false;
837
838 if ((proposed_placement & man->available_caching) == 0)
839 return false;
840
841 cur_flags |= (proposed_placement & man->available_caching);
842
843 *masked_placement = cur_flags;
844 return true;
845 }
846
847 /**
848 * Creates space for memory region @mem according to its type.
849 *
850 * This function first searches for free space in compatible memory types in
851 * the priority order defined by the driver. If free space isn't found, then
852 * ttm_bo_mem_force_space is attempted in priority order to evict and find
853 * space.
854 */
855 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
856 struct ttm_placement *placement,
857 struct ttm_mem_reg *mem,
858 bool interruptible, bool no_wait)
859 {
860 struct ttm_bo_device *bdev = bo->bdev;
861 struct ttm_mem_type_manager *man;
862 uint32_t mem_type = TTM_PL_SYSTEM;
863 uint32_t cur_flags = 0;
864 bool type_found = false;
865 bool type_ok = false;
866 bool has_erestartsys = false;
867 struct drm_mm_node *node = NULL;
868 int i, ret;
869
870 mem->mm_node = NULL;
871 for (i = 0; i < placement->num_placement; ++i) {
872 ret = ttm_mem_type_from_flags(placement->placement[i],
873 &mem_type);
874 if (ret)
875 return ret;
876 man = &bdev->man[mem_type];
877
878 type_ok = ttm_bo_mt_compatible(man,
879 bo->type == ttm_bo_type_user,
880 mem_type,
881 placement->placement[i],
882 &cur_flags);
883
884 if (!type_ok)
885 continue;
886
887 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
888 cur_flags);
889 /*
890 * Use the access and other non-mapping-related flag bits from
891 * the memory placement flags to the current flags
892 */
893 ttm_flag_masked(&cur_flags, placement->placement[i],
894 ~TTM_PL_MASK_MEMTYPE);
895
896 if (mem_type == TTM_PL_SYSTEM)
897 break;
898
899 if (man->has_type && man->use_type) {
900 type_found = true;
901 ret = ttm_bo_man_get_node(bo, man, placement, mem,
902 &node);
903 if (unlikely(ret))
904 return ret;
905 }
906 if (node)
907 break;
908 }
909
910 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) {
911 mem->mm_node = node;
912 mem->mem_type = mem_type;
913 mem->placement = cur_flags;
914 if (node)
915 node->private = bo;
916 return 0;
917 }
918
919 if (!type_found)
920 return -EINVAL;
921
922 for (i = 0; i < placement->num_busy_placement; ++i) {
923 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
924 &mem_type);
925 if (ret)
926 return ret;
927 man = &bdev->man[mem_type];
928 if (!man->has_type)
929 continue;
930 if (!ttm_bo_mt_compatible(man,
931 bo->type == ttm_bo_type_user,
932 mem_type,
933 placement->busy_placement[i],
934 &cur_flags))
935 continue;
936
937 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
938 cur_flags);
939 /*
940 * Use the access and other non-mapping-related flag bits from
941 * the memory placement flags to the current flags
942 */
943 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
944 ~TTM_PL_MASK_MEMTYPE);
945
946
947 if (mem_type == TTM_PL_SYSTEM) {
948 mem->mem_type = mem_type;
949 mem->placement = cur_flags;
950 mem->mm_node = NULL;
951 return 0;
952 }
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.size = num_pages << PAGE_SHIFT;
1146 bo->mem.mem_type = TTM_PL_SYSTEM;
1147 bo->mem.num_pages = bo->num_pages;
1148 bo->mem.mm_node = NULL;
1149 bo->mem.page_alignment = page_alignment;
1150 bo->buffer_start = buffer_start & PAGE_MASK;
1151 bo->priv_flags = 0;
1152 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1153 bo->seq_valid = false;
1154 bo->persistant_swap_storage = persistant_swap_storage;
1155 bo->acc_size = acc_size;
1156 atomic_inc(&bo->glob->bo_count);
1157
1158 ret = ttm_bo_check_placement(bo, placement);
1159 if (unlikely(ret != 0))
1160 goto out_err;
1161
1162 /*
1163 * For ttm_bo_type_device buffers, allocate
1164 * address space from the device.
1165 */
1166 if (bo->type == ttm_bo_type_device) {
1167 ret = ttm_bo_setup_vm(bo);
1168 if (ret)
1169 goto out_err;
1170 }
1171
1172 ret = ttm_bo_validate(bo, placement, interruptible, false);
1173 if (ret)
1174 goto out_err;
1175
1176 ttm_bo_unreserve(bo);
1177 return 0;
1178
1179 out_err:
1180 ttm_bo_unreserve(bo);
1181 ttm_bo_unref(&bo);
1182
1183 return ret;
1184 }
1185 EXPORT_SYMBOL(ttm_bo_init);
1186
1187 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1188 unsigned long num_pages)
1189 {
1190 size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1191 PAGE_MASK;
1192
1193 return glob->ttm_bo_size + 2 * page_array_size;
1194 }
1195
1196 int ttm_bo_create(struct ttm_bo_device *bdev,
1197 unsigned long size,
1198 enum ttm_bo_type type,
1199 struct ttm_placement *placement,
1200 uint32_t page_alignment,
1201 unsigned long buffer_start,
1202 bool interruptible,
1203 struct file *persistant_swap_storage,
1204 struct ttm_buffer_object **p_bo)
1205 {
1206 struct ttm_buffer_object *bo;
1207 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1208 int ret;
1209
1210 size_t acc_size =
1211 ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1212 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1213 if (unlikely(ret != 0))
1214 return ret;
1215
1216 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1217
1218 if (unlikely(bo == NULL)) {
1219 ttm_mem_global_free(mem_glob, acc_size);
1220 return -ENOMEM;
1221 }
1222
1223 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1224 buffer_start, interruptible,
1225 persistant_swap_storage, acc_size, NULL);
1226 if (likely(ret == 0))
1227 *p_bo = bo;
1228
1229 return ret;
1230 }
1231
1232 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1233 unsigned mem_type, bool allow_errors)
1234 {
1235 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1236 struct ttm_bo_global *glob = bdev->glob;
1237 int ret;
1238
1239 /*
1240 * Can't use standard list traversal since we're unlocking.
1241 */
1242
1243 spin_lock(&glob->lru_lock);
1244 while (!list_empty(&man->lru)) {
1245 spin_unlock(&glob->lru_lock);
1246 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1247 if (ret) {
1248 if (allow_errors) {
1249 return ret;
1250 } else {
1251 printk(KERN_ERR TTM_PFX
1252 "Cleanup eviction failed\n");
1253 }
1254 }
1255 spin_lock(&glob->lru_lock);
1256 }
1257 spin_unlock(&glob->lru_lock);
1258 return 0;
1259 }
1260
1261 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1262 {
1263 struct ttm_bo_global *glob = bdev->glob;
1264 struct ttm_mem_type_manager *man;
1265 int ret = -EINVAL;
1266
1267 if (mem_type >= TTM_NUM_MEM_TYPES) {
1268 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1269 return ret;
1270 }
1271 man = &bdev->man[mem_type];
1272
1273 if (!man->has_type) {
1274 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1275 "memory manager type %u\n", mem_type);
1276 return ret;
1277 }
1278
1279 man->use_type = false;
1280 man->has_type = false;
1281
1282 ret = 0;
1283 if (mem_type > 0) {
1284 ttm_bo_force_list_clean(bdev, mem_type, false);
1285
1286 spin_lock(&glob->lru_lock);
1287 if (drm_mm_clean(&man->manager))
1288 drm_mm_takedown(&man->manager);
1289 else
1290 ret = -EBUSY;
1291
1292 spin_unlock(&glob->lru_lock);
1293 }
1294
1295 return ret;
1296 }
1297 EXPORT_SYMBOL(ttm_bo_clean_mm);
1298
1299 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1300 {
1301 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1302
1303 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1304 printk(KERN_ERR TTM_PFX
1305 "Illegal memory manager memory type %u.\n",
1306 mem_type);
1307 return -EINVAL;
1308 }
1309
1310 if (!man->has_type) {
1311 printk(KERN_ERR TTM_PFX
1312 "Memory type %u has not been initialized.\n",
1313 mem_type);
1314 return 0;
1315 }
1316
1317 return ttm_bo_force_list_clean(bdev, mem_type, true);
1318 }
1319 EXPORT_SYMBOL(ttm_bo_evict_mm);
1320
1321 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1322 unsigned long p_size)
1323 {
1324 int ret = -EINVAL;
1325 struct ttm_mem_type_manager *man;
1326
1327 if (type >= TTM_NUM_MEM_TYPES) {
1328 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type);
1329 return ret;
1330 }
1331
1332 man = &bdev->man[type];
1333 if (man->has_type) {
1334 printk(KERN_ERR TTM_PFX
1335 "Memory manager already initialized for type %d\n",
1336 type);
1337 return ret;
1338 }
1339
1340 ret = bdev->driver->init_mem_type(bdev, type, man);
1341 if (ret)
1342 return ret;
1343
1344 ret = 0;
1345 if (type != TTM_PL_SYSTEM) {
1346 if (!p_size) {
1347 printk(KERN_ERR TTM_PFX
1348 "Zero size memory manager type %d\n",
1349 type);
1350 return ret;
1351 }
1352 ret = drm_mm_init(&man->manager, 0, p_size);
1353 if (ret)
1354 return ret;
1355 }
1356 man->has_type = true;
1357 man->use_type = true;
1358 man->size = p_size;
1359
1360 INIT_LIST_HEAD(&man->lru);
1361
1362 return 0;
1363 }
1364 EXPORT_SYMBOL(ttm_bo_init_mm);
1365
1366 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1367 {
1368 struct ttm_bo_global *glob =
1369 container_of(kobj, struct ttm_bo_global, kobj);
1370
1371 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1372 __free_page(glob->dummy_read_page);
1373 kfree(glob);
1374 }
1375
1376 void ttm_bo_global_release(struct ttm_global_reference *ref)
1377 {
1378 struct ttm_bo_global *glob = ref->object;
1379
1380 kobject_del(&glob->kobj);
1381 kobject_put(&glob->kobj);
1382 }
1383 EXPORT_SYMBOL(ttm_bo_global_release);
1384
1385 int ttm_bo_global_init(struct ttm_global_reference *ref)
1386 {
1387 struct ttm_bo_global_ref *bo_ref =
1388 container_of(ref, struct ttm_bo_global_ref, ref);
1389 struct ttm_bo_global *glob = ref->object;
1390 int ret;
1391
1392 mutex_init(&glob->device_list_mutex);
1393 spin_lock_init(&glob->lru_lock);
1394 glob->mem_glob = bo_ref->mem_glob;
1395 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1396
1397 if (unlikely(glob->dummy_read_page == NULL)) {
1398 ret = -ENOMEM;
1399 goto out_no_drp;
1400 }
1401
1402 INIT_LIST_HEAD(&glob->swap_lru);
1403 INIT_LIST_HEAD(&glob->device_list);
1404
1405 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1406 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1407 if (unlikely(ret != 0)) {
1408 printk(KERN_ERR TTM_PFX
1409 "Could not register buffer object swapout.\n");
1410 goto out_no_shrink;
1411 }
1412
1413 glob->ttm_bo_extra_size =
1414 ttm_round_pot(sizeof(struct ttm_tt)) +
1415 ttm_round_pot(sizeof(struct ttm_backend));
1416
1417 glob->ttm_bo_size = glob->ttm_bo_extra_size +
1418 ttm_round_pot(sizeof(struct ttm_buffer_object));
1419
1420 atomic_set(&glob->bo_count, 0);
1421
1422 kobject_init(&glob->kobj, &ttm_bo_glob_kobj_type);
1423 ret = kobject_add(&glob->kobj, ttm_get_kobj(), "buffer_objects");
1424 if (unlikely(ret != 0))
1425 kobject_put(&glob->kobj);
1426 return ret;
1427 out_no_shrink:
1428 __free_page(glob->dummy_read_page);
1429 out_no_drp:
1430 kfree(glob);
1431 return ret;
1432 }
1433 EXPORT_SYMBOL(ttm_bo_global_init);
1434
1435
1436 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1437 {
1438 int ret = 0;
1439 unsigned i = TTM_NUM_MEM_TYPES;
1440 struct ttm_mem_type_manager *man;
1441 struct ttm_bo_global *glob = bdev->glob;
1442
1443 while (i--) {
1444 man = &bdev->man[i];
1445 if (man->has_type) {
1446 man->use_type = false;
1447 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1448 ret = -EBUSY;
1449 printk(KERN_ERR TTM_PFX
1450 "DRM memory manager type %d "
1451 "is not clean.\n", i);
1452 }
1453 man->has_type = false;
1454 }
1455 }
1456
1457 mutex_lock(&glob->device_list_mutex);
1458 list_del(&bdev->device_list);
1459 mutex_unlock(&glob->device_list_mutex);
1460
1461 if (!cancel_delayed_work(&bdev->wq))
1462 flush_scheduled_work();
1463
1464 while (ttm_bo_delayed_delete(bdev, true))
1465 ;
1466
1467 spin_lock(&glob->lru_lock);
1468 if (list_empty(&bdev->ddestroy))
1469 TTM_DEBUG("Delayed destroy list was clean\n");
1470
1471 if (list_empty(&bdev->man[0].lru))
1472 TTM_DEBUG("Swap list was clean\n");
1473 spin_unlock(&glob->lru_lock);
1474
1475 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1476 write_lock(&bdev->vm_lock);
1477 drm_mm_takedown(&bdev->addr_space_mm);
1478 write_unlock(&bdev->vm_lock);
1479
1480 return ret;
1481 }
1482 EXPORT_SYMBOL(ttm_bo_device_release);
1483
1484 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1485 struct ttm_bo_global *glob,
1486 struct ttm_bo_driver *driver,
1487 uint64_t file_page_offset,
1488 bool need_dma32)
1489 {
1490 int ret = -EINVAL;
1491
1492 rwlock_init(&bdev->vm_lock);
1493 bdev->driver = driver;
1494
1495 memset(bdev->man, 0, sizeof(bdev->man));
1496
1497 /*
1498 * Initialize the system memory buffer type.
1499 * Other types need to be driver / IOCTL initialized.
1500 */
1501 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1502 if (unlikely(ret != 0))
1503 goto out_no_sys;
1504
1505 bdev->addr_space_rb = RB_ROOT;
1506 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1507 if (unlikely(ret != 0))
1508 goto out_no_addr_mm;
1509
1510 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1511 bdev->nice_mode = true;
1512 INIT_LIST_HEAD(&bdev->ddestroy);
1513 bdev->dev_mapping = NULL;
1514 bdev->glob = glob;
1515 bdev->need_dma32 = need_dma32;
1516
1517 mutex_lock(&glob->device_list_mutex);
1518 list_add_tail(&bdev->device_list, &glob->device_list);
1519 mutex_unlock(&glob->device_list_mutex);
1520
1521 return 0;
1522 out_no_addr_mm:
1523 ttm_bo_clean_mm(bdev, 0);
1524 out_no_sys:
1525 return ret;
1526 }
1527 EXPORT_SYMBOL(ttm_bo_device_init);
1528
1529 /*
1530 * buffer object vm functions.
1531 */
1532
1533 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1534 {
1535 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1536
1537 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1538 if (mem->mem_type == TTM_PL_SYSTEM)
1539 return false;
1540
1541 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1542 return false;
1543
1544 if (mem->placement & TTM_PL_FLAG_CACHED)
1545 return false;
1546 }
1547 return true;
1548 }
1549
1550 int ttm_bo_pci_offset(struct ttm_bo_device *bdev,
1551 struct ttm_mem_reg *mem,
1552 unsigned long *bus_base,
1553 unsigned long *bus_offset, unsigned long *bus_size)
1554 {
1555 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1556
1557 *bus_size = 0;
1558 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
1559 return -EINVAL;
1560
1561 if (ttm_mem_reg_is_pci(bdev, mem)) {
1562 *bus_offset = mem->mm_node->start << PAGE_SHIFT;
1563 *bus_size = mem->num_pages << PAGE_SHIFT;
1564 *bus_base = man->io_offset;
1565 }
1566
1567 return 0;
1568 }
1569
1570 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1571 {
1572 struct ttm_bo_device *bdev = bo->bdev;
1573 loff_t offset = (loff_t) bo->addr_space_offset;
1574 loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1575
1576 if (!bdev->dev_mapping)
1577 return;
1578
1579 unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1580 }
1581 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1582
1583 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1584 {
1585 struct ttm_bo_device *bdev = bo->bdev;
1586 struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1587 struct rb_node *parent = NULL;
1588 struct ttm_buffer_object *cur_bo;
1589 unsigned long offset = bo->vm_node->start;
1590 unsigned long cur_offset;
1591
1592 while (*cur) {
1593 parent = *cur;
1594 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1595 cur_offset = cur_bo->vm_node->start;
1596 if (offset < cur_offset)
1597 cur = &parent->rb_left;
1598 else if (offset > cur_offset)
1599 cur = &parent->rb_right;
1600 else
1601 BUG();
1602 }
1603
1604 rb_link_node(&bo->vm_rb, parent, cur);
1605 rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1606 }
1607
1608 /**
1609 * ttm_bo_setup_vm:
1610 *
1611 * @bo: the buffer to allocate address space for
1612 *
1613 * Allocate address space in the drm device so that applications
1614 * can mmap the buffer and access the contents. This only
1615 * applies to ttm_bo_type_device objects as others are not
1616 * placed in the drm device address space.
1617 */
1618
1619 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1620 {
1621 struct ttm_bo_device *bdev = bo->bdev;
1622 int ret;
1623
1624 retry_pre_get:
1625 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1626 if (unlikely(ret != 0))
1627 return ret;
1628
1629 write_lock(&bdev->vm_lock);
1630 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1631 bo->mem.num_pages, 0, 0);
1632
1633 if (unlikely(bo->vm_node == NULL)) {
1634 ret = -ENOMEM;
1635 goto out_unlock;
1636 }
1637
1638 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1639 bo->mem.num_pages, 0);
1640
1641 if (unlikely(bo->vm_node == NULL)) {
1642 write_unlock(&bdev->vm_lock);
1643 goto retry_pre_get;
1644 }
1645
1646 ttm_bo_vm_insert_rb(bo);
1647 write_unlock(&bdev->vm_lock);
1648 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1649
1650 return 0;
1651 out_unlock:
1652 write_unlock(&bdev->vm_lock);
1653 return ret;
1654 }
1655
1656 int ttm_bo_wait(struct ttm_buffer_object *bo,
1657 bool lazy, bool interruptible, bool no_wait)
1658 {
1659 struct ttm_bo_driver *driver = bo->bdev->driver;
1660 void *sync_obj;
1661 void *sync_obj_arg;
1662 int ret = 0;
1663
1664 if (likely(bo->sync_obj == NULL))
1665 return 0;
1666
1667 while (bo->sync_obj) {
1668
1669 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1670 void *tmp_obj = bo->sync_obj;
1671 bo->sync_obj = NULL;
1672 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1673 spin_unlock(&bo->lock);
1674 driver->sync_obj_unref(&tmp_obj);
1675 spin_lock(&bo->lock);
1676 continue;
1677 }
1678
1679 if (no_wait)
1680 return -EBUSY;
1681
1682 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1683 sync_obj_arg = bo->sync_obj_arg;
1684 spin_unlock(&bo->lock);
1685 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1686 lazy, interruptible);
1687 if (unlikely(ret != 0)) {
1688 driver->sync_obj_unref(&sync_obj);
1689 spin_lock(&bo->lock);
1690 return ret;
1691 }
1692 spin_lock(&bo->lock);
1693 if (likely(bo->sync_obj == sync_obj &&
1694 bo->sync_obj_arg == sync_obj_arg)) {
1695 void *tmp_obj = bo->sync_obj;
1696 bo->sync_obj = NULL;
1697 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1698 &bo->priv_flags);
1699 spin_unlock(&bo->lock);
1700 driver->sync_obj_unref(&sync_obj);
1701 driver->sync_obj_unref(&tmp_obj);
1702 spin_lock(&bo->lock);
1703 } else {
1704 spin_unlock(&bo->lock);
1705 driver->sync_obj_unref(&sync_obj);
1706 spin_lock(&bo->lock);
1707 }
1708 }
1709 return 0;
1710 }
1711 EXPORT_SYMBOL(ttm_bo_wait);
1712
1713 void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo)
1714 {
1715 atomic_set(&bo->reserved, 0);
1716 wake_up_all(&bo->event_queue);
1717 }
1718
1719 int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible,
1720 bool no_wait)
1721 {
1722 int ret;
1723
1724 while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
1725 if (no_wait)
1726 return -EBUSY;
1727 else if (interruptible) {
1728 ret = wait_event_interruptible
1729 (bo->event_queue, atomic_read(&bo->reserved) == 0);
1730 if (unlikely(ret != 0))
1731 return ret;
1732 } else {
1733 wait_event(bo->event_queue,
1734 atomic_read(&bo->reserved) == 0);
1735 }
1736 }
1737 return 0;
1738 }
1739
1740 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1741 {
1742 int ret = 0;
1743
1744 /*
1745 * Using ttm_bo_reserve instead of ttm_bo_block_reservation
1746 * makes sure the lru lists are updated.
1747 */
1748
1749 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1750 if (unlikely(ret != 0))
1751 return ret;
1752 spin_lock(&bo->lock);
1753 ret = ttm_bo_wait(bo, false, true, no_wait);
1754 spin_unlock(&bo->lock);
1755 if (likely(ret == 0))
1756 atomic_inc(&bo->cpu_writers);
1757 ttm_bo_unreserve(bo);
1758 return ret;
1759 }
1760 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1761
1762 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1763 {
1764 if (atomic_dec_and_test(&bo->cpu_writers))
1765 wake_up_all(&bo->event_queue);
1766 }
1767 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1768
1769 /**
1770 * A buffer object shrink method that tries to swap out the first
1771 * buffer object on the bo_global::swap_lru list.
1772 */
1773
1774 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1775 {
1776 struct ttm_bo_global *glob =
1777 container_of(shrink, struct ttm_bo_global, shrink);
1778 struct ttm_buffer_object *bo;
1779 int ret = -EBUSY;
1780 int put_count;
1781 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1782
1783 spin_lock(&glob->lru_lock);
1784 while (ret == -EBUSY) {
1785 if (unlikely(list_empty(&glob->swap_lru))) {
1786 spin_unlock(&glob->lru_lock);
1787 return -EBUSY;
1788 }
1789
1790 bo = list_first_entry(&glob->swap_lru,
1791 struct ttm_buffer_object, swap);
1792 kref_get(&bo->list_kref);
1793
1794 /**
1795 * Reserve buffer. Since we unlock while sleeping, we need
1796 * to re-check that nobody removed us from the swap-list while
1797 * we slept.
1798 */
1799
1800 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1801 if (unlikely(ret == -EBUSY)) {
1802 spin_unlock(&glob->lru_lock);
1803 ttm_bo_wait_unreserved(bo, false);
1804 kref_put(&bo->list_kref, ttm_bo_release_list);
1805 spin_lock(&glob->lru_lock);
1806 }
1807 }
1808
1809 BUG_ON(ret != 0);
1810 put_count = ttm_bo_del_from_lru(bo);
1811 spin_unlock(&glob->lru_lock);
1812
1813 while (put_count--)
1814 kref_put(&bo->list_kref, ttm_bo_ref_bug);
1815
1816 /**
1817 * Wait for GPU, then move to system cached.
1818 */
1819
1820 spin_lock(&bo->lock);
1821 ret = ttm_bo_wait(bo, false, false, false);
1822 spin_unlock(&bo->lock);
1823
1824 if (unlikely(ret != 0))
1825 goto out;
1826
1827 if ((bo->mem.placement & swap_placement) != swap_placement) {
1828 struct ttm_mem_reg evict_mem;
1829
1830 evict_mem = bo->mem;
1831 evict_mem.mm_node = NULL;
1832 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1833 evict_mem.mem_type = TTM_PL_SYSTEM;
1834
1835 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1836 false, false);
1837 if (unlikely(ret != 0))
1838 goto out;
1839 }
1840
1841 ttm_bo_unmap_virtual(bo);
1842
1843 /**
1844 * Swap out. Buffer will be swapped in again as soon as
1845 * anyone tries to access a ttm page.
1846 */
1847
1848 if (bo->bdev->driver->swap_notify)
1849 bo->bdev->driver->swap_notify(bo);
1850
1851 ret = ttm_tt_swapout(bo->ttm, bo->persistant_swap_storage);
1852 out:
1853
1854 /**
1855 *
1856 * Unreserve without putting on LRU to avoid swapping out an
1857 * already swapped buffer.
1858 */
1859
1860 atomic_set(&bo->reserved, 0);
1861 wake_up_all(&bo->event_queue);
1862 kref_put(&bo->list_kref, ttm_bo_release_list);
1863 return ret;
1864 }
1865
1866 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1867 {
1868 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1869 ;
1870 }
1871 EXPORT_SYMBOL(ttm_bo_swapout_all);
CRIS linux kernel tree