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hyperv: Move commonly shared header files to the module's top dir.
[dragonfly.git] / sys / dev / drm / ttm / ttm_bo.c
blobe1b5b9a5117d160acf84d30e0ea1ccc3fc1fc933
1 /**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27 /*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31 #define pr_fmt(fmt) "[TTM] " fmt
32
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_bo_driver.h>
35 #include <drm/ttm/ttm_placement.h>
36 #include <linux/atomic.h>
37 #include <linux/errno.h>
38 #include <linux/export.h>
39 #include <linux/wait.h>
40
41 #define TTM_ASSERT_LOCKED(param)
42 #define TTM_DEBUG(fmt, arg...)
43 #define TTM_BO_HASH_ORDER 13
44
45 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
46 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
47 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob);
48
49 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
50 uint32_t *mem_type)
51 {
52 int i;
53
54 for (i = 0; i <= TTM_PL_PRIV5; i++)
55 if (place->flags & (1 << i)) {
56 *mem_type = i;
57 return 0;
58 }
59 return -EINVAL;
60 }
61
62 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
63 {
64 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
65
66 pr_err(" has_type: %d\n", man->has_type);
67 pr_err(" use_type: %d\n", man->use_type);
68 pr_err(" flags: 0x%08X\n", man->flags);
69 pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset);
70 pr_err(" size: %ju\n", (uintmax_t)man->size);
71 pr_err(" available_caching: 0x%08X\n", man->available_caching);
72 pr_err(" default_caching: 0x%08X\n", man->default_caching);
73 if (mem_type != TTM_PL_SYSTEM)
74 (*man->func->debug)(man, TTM_PFX);
75 }
76
77 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
78 struct ttm_placement *placement)
79 {
80 int i, ret, mem_type;
81
82 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
83 bo, bo->mem.num_pages, bo->mem.size >> 10,
84 bo->mem.size >> 20);
85 for (i = 0; i < placement->num_placement; i++) {
86 ret = ttm_mem_type_from_place(&placement->placement[i],
87 &mem_type);
88 if (ret)
89 return;
90 pr_err(" placement[%d]=0x%08X (%d)\n",
91 i, placement->placement[i].flags, mem_type);
92 ttm_mem_type_debug(bo->bdev, mem_type);
93 }
94 }
95
96 #if 0
97 static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
98 char *buffer)
99 {
100
101 return snprintf(buffer, PAGE_SIZE, "%lu\n",
102 (unsigned long) atomic_read(&glob->bo_count));
103 }
104 #endif
105
106 static inline uint32_t ttm_bo_type_flags(unsigned type)
107 {
108 return 1 << (type);
109 }
110
111 static void ttm_bo_release_list(struct kref *list_kref)
112 {
113 struct ttm_buffer_object *bo =
114 container_of(list_kref, struct ttm_buffer_object, list_kref);
115 struct ttm_bo_device *bdev = bo->bdev;
116 size_t acc_size = bo->acc_size;
117
118 BUG_ON(atomic_read(&bo->list_kref.refcount));
119 BUG_ON(atomic_read(&bo->kref.refcount));
120 BUG_ON(atomic_read(&bo->cpu_writers));
121 BUG_ON(bo->sync_obj != NULL);
122 BUG_ON(bo->mem.mm_node != NULL);
123 BUG_ON(!list_empty(&bo->lru));
124 BUG_ON(!list_empty(&bo->ddestroy));
125
126 if (bo->ttm)
127 ttm_tt_destroy(bo->ttm);
128 atomic_dec(&bo->glob->bo_count);
129 if (bo->destroy)
130 bo->destroy(bo);
131 else {
132 kfree(bo);
133 }
134 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
135 }
136
137 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
138 bool interruptible)
139 {
140 if (interruptible) {
141 return wait_event_interruptible(bo->event_queue,
142 !ttm_bo_is_reserved(bo));
143 } else {
144 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
145 return 0;
146 }
147 }
148
149 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
150 {
151 struct ttm_bo_device *bdev = bo->bdev;
152 struct ttm_mem_type_manager *man;
153
154 BUG_ON(!ttm_bo_is_reserved(bo));
155
156 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
157
158 BUG_ON(!list_empty(&bo->lru));
159
160 man = &bdev->man[bo->mem.mem_type];
161 list_add_tail(&bo->lru, &man->lru);
162 kref_get(&bo->list_kref);
163
164 if (bo->ttm != NULL) {
165 list_add_tail(&bo->swap, &bo->glob->swap_lru);
166 kref_get(&bo->list_kref);
167 }
168 }
169 }
170
171 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
172 {
173 int put_count = 0;
174
175 if (!list_empty(&bo->swap)) {
176 list_del_init(&bo->swap);
177 ++put_count;
178 }
179 if (!list_empty(&bo->lru)) {
180 list_del_init(&bo->lru);
181 ++put_count;
182 }
183
184 /*
185 * TODO: Add a driver hook to delete from
186 * driver-specific LRU's here.
187 */
188
189 return put_count;
190 }
191
192 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
193 bool interruptible,
194 bool no_wait, bool use_ticket,
195 struct ww_acquire_ctx *ticket)
196 {
197 int ret;
198
199 while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
200 /**
201 * Deadlock avoidance for multi-bo reserving.
202 */
203 if (use_ticket && bo->seq_valid) {
204 /**
205 * We've already reserved this one.
206 */
207 if (unlikely(ticket->stamp == bo->val_seq))
208 return -EDEADLK;
209 /**
210 * Already reserved by a thread that will not back
211 * off for us. We need to back off.
212 */
213 if (unlikely(ticket->stamp - bo->val_seq <= LONG_MAX))
214 return -EAGAIN;
215 }
216
217 if (no_wait)
218 return -EBUSY;
219
220 ret = ttm_bo_wait_unreserved(bo, interruptible);
221
222 if (unlikely(ret))
223 return ret;
224 }
225
226 if (use_ticket) {
227 bool wake_up = false;
228
229 /**
230 * Wake up waiters that may need to recheck for deadlock,
231 * if we decreased the sequence number.
232 */
233 if (unlikely((bo->val_seq - ticket->stamp <= LONG_MAX)
234 || !bo->seq_valid))
235 wake_up = true;
236
237 /*
238 * In the worst case with memory ordering these values can be
239 * seen in the wrong order. However since we call wake_up_all
240 * in that case, this will hopefully not pose a problem,
241 * and the worst case would only cause someone to accidentally
242 * hit -EAGAIN in ttm_bo_reserve when they see old value of
243 * val_seq. However this would only happen if seq_valid was
244 * written before val_seq was, and just means some slightly
245 * increased cpu usage
246 */
247 bo->val_seq = ticket->stamp;
248 bo->seq_valid = true;
249 if (wake_up)
250 wake_up_all(&bo->event_queue);
251 } else {
252 bo->seq_valid = false;
253 }
254
255 return 0;
256 }
257 EXPORT_SYMBOL(ttm_bo_reserve);
258
259 static void ttm_bo_ref_bug(struct kref *list_kref)
260 {
261 BUG();
262 }
263
264 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
265 bool never_free)
266 {
267 kref_sub(&bo->list_kref, count,
268 (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
269 }
270
271 int ttm_bo_reserve(struct ttm_buffer_object *bo,
272 bool interruptible,
273 bool no_wait, bool use_ticket,
274 struct ww_acquire_ctx *ticket)
275 {
276 struct ttm_bo_global *glob = bo->glob;
277 int put_count = 0;
278 int ret;
279
280 ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
281 ticket);
282 if (likely(ret == 0)) {
283 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
284 put_count = ttm_bo_del_from_lru(bo);
285 lockmgr(&glob->lru_lock, LK_RELEASE);
286 ttm_bo_list_ref_sub(bo, put_count, true);
287 }
288
289 return ret;
290 }
291
292 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
293 bool interruptible,
294 struct ww_acquire_ctx *ticket)
295 {
296 bool wake_up = false;
297 int ret;
298
299 while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
300 WARN_ON(bo->seq_valid && ticket->stamp == bo->val_seq);
301
302 ret = ttm_bo_wait_unreserved(bo, interruptible);
303
304 if (unlikely(ret))
305 return ret;
306 }
307
308 if (bo->val_seq - ticket->stamp < LONG_MAX || !bo->seq_valid)
309 wake_up = true;
310
311 /**
312 * Wake up waiters that may need to recheck for deadlock,
313 * if we decreased the sequence number.
314 */
315 bo->val_seq = ticket->stamp;
316 bo->seq_valid = true;
317 if (wake_up)
318 wake_up_all(&bo->event_queue);
319
320 return 0;
321 }
322
323 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
324 bool interruptible, struct ww_acquire_ctx *ticket)
325 {
326 struct ttm_bo_global *glob = bo->glob;
327 int put_count, ret;
328
329 ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, ticket);
330 if (likely(!ret)) {
331 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
332 put_count = ttm_bo_del_from_lru(bo);
333 lockmgr(&glob->lru_lock, LK_RELEASE);
334 ttm_bo_list_ref_sub(bo, put_count, true);
335 }
336 return ret;
337 }
338 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
339
340 /*
341 * Must interlock with event_queue to avoid race against
342 * wait_event_common() which can cause wait_event_common()
343 * to become stuck.
344 */
345 static void
346 ttm_bo_unreserve_core(struct ttm_buffer_object *bo)
347 {
348 lockmgr(&bo->event_queue.lock, LK_EXCLUSIVE);
349 atomic_set(&bo->reserved, 0);
350 lockmgr(&bo->event_queue.lock, LK_RELEASE);
351 wake_up_all(&bo->event_queue);
352 }
353
354 void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
355 {
356 ttm_bo_add_to_lru(bo);
357 ttm_bo_unreserve_core(bo);
358 }
359
360 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
361 {
362 struct ttm_bo_global *glob = bo->glob;
363
364 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
365 ttm_bo_unreserve_ticket_locked(bo, NULL);
366 lockmgr(&glob->lru_lock, LK_RELEASE);
367 }
368 EXPORT_SYMBOL(ttm_bo_unreserve);
369
370 void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
371 {
372 struct ttm_bo_global *glob = bo->glob;
373
374 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
375 ttm_bo_unreserve_ticket_locked(bo, ticket);
376 lockmgr(&glob->lru_lock, LK_RELEASE);
377 }
378 EXPORT_SYMBOL(ttm_bo_unreserve_ticket);
379
380 /*
381 * Call bo->mutex locked.
382 */
383 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
384 {
385 struct ttm_bo_device *bdev = bo->bdev;
386 struct ttm_bo_global *glob = bo->glob;
387 int ret = 0;
388 uint32_t page_flags = 0;
389
390 TTM_ASSERT_LOCKED(&bo->mutex);
391 bo->ttm = NULL;
392
393 if (bdev->need_dma32)
394 page_flags |= TTM_PAGE_FLAG_DMA32;
395
396 switch (bo->type) {
397 case ttm_bo_type_device:
398 if (zero_alloc)
399 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
400 case ttm_bo_type_kernel:
401 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
402 page_flags, glob->dummy_read_page);
403 if (unlikely(bo->ttm == NULL))
404 ret = -ENOMEM;
405 break;
406 case ttm_bo_type_sg:
407 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
408 page_flags | TTM_PAGE_FLAG_SG,
409 glob->dummy_read_page);
410 if (unlikely(bo->ttm == NULL)) {
411 ret = -ENOMEM;
412 break;
413 }
414 bo->ttm->sg = bo->sg;
415 break;
416 default:
417 pr_err("Illegal buffer object type\n");
418 ret = -EINVAL;
419 break;
420 }
421
422 return ret;
423 }
424
425 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
426 struct ttm_mem_reg *mem,
427 bool evict, bool interruptible,
428 bool no_wait_gpu)
429 {
430 struct ttm_bo_device *bdev = bo->bdev;
431 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
432 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
433 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
434 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
435 int ret = 0;
436
437 if (old_is_pci || new_is_pci ||
438 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
439 ret = ttm_mem_io_lock(old_man, true);
440 if (unlikely(ret != 0))
441 goto out_err;
442 ttm_bo_unmap_virtual_locked(bo);
443 ttm_mem_io_unlock(old_man);
444 }
445
446 /*
447 * Create and bind a ttm if required.
448 */
449
450 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
451 if (bo->ttm == NULL) {
452 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
453 ret = ttm_bo_add_ttm(bo, zero);
454 if (ret)
455 goto out_err;
456 }
457
458 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
459 if (ret)
460 goto out_err;
461
462 if (mem->mem_type != TTM_PL_SYSTEM) {
463 ret = ttm_tt_bind(bo->ttm, mem);
464 if (ret)
465 goto out_err;
466 }
467
468 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
469 if (bdev->driver->move_notify)
470 bdev->driver->move_notify(bo, mem);
471 bo->mem = *mem;
472 mem->mm_node = NULL;
473 goto moved;
474 }
475 }
476
477 if (bdev->driver->move_notify)
478 bdev->driver->move_notify(bo, mem);
479
480 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
481 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
482 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
483 else if (bdev->driver->move)
484 ret = bdev->driver->move(bo, evict, interruptible,
485 no_wait_gpu, mem);
486 else
487 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
488
489 if (ret) {
490 if (bdev->driver->move_notify) {
491 struct ttm_mem_reg tmp_mem = *mem;
492 *mem = bo->mem;
493 bo->mem = tmp_mem;
494 bdev->driver->move_notify(bo, mem);
495 bo->mem = *mem;
496 *mem = tmp_mem;
497 }
498
499 goto out_err;
500 }
501
502 moved:
503 if (bo->evicted) {
504 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
505 if (ret)
506 pr_err("Can not flush read caches\n");
507 bo->evicted = false;
508 }
509
510 if (bo->mem.mm_node) {
511 bo->offset = (bo->mem.start << PAGE_SHIFT) +
512 bdev->man[bo->mem.mem_type].gpu_offset;
513 bo->cur_placement = bo->mem.placement;
514 } else
515 bo->offset = 0;
516
517 return 0;
518
519 out_err:
520 new_man = &bdev->man[bo->mem.mem_type];
521 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
522 ttm_tt_unbind(bo->ttm);
523 ttm_tt_destroy(bo->ttm);
524 bo->ttm = NULL;
525 }
526
527 return ret;
528 }
529
530 /**
531 * Call bo::reserved.
532 * Will release GPU memory type usage on destruction.
533 * This is the place to put in driver specific hooks to release
534 * driver private resources.
535 * Will release the bo::reserved lock.
536 */
537
538 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
539 {
540 if (bo->bdev->driver->move_notify)
541 bo->bdev->driver->move_notify(bo, NULL);
542
543 if (bo->ttm) {
544 ttm_tt_unbind(bo->ttm);
545 ttm_tt_destroy(bo->ttm);
546 bo->ttm = NULL;
547 }
548 ttm_bo_mem_put(bo, &bo->mem);
549 ttm_bo_unreserve_core(bo);
550
551 /*
552 * Since the final reference to this bo may not be dropped by
553 * the current task we have to put a memory barrier here to make
554 * sure the changes done in this function are always visible.
555 *
556 * This function only needs protection against the final kref_put.
557 */
558 cpu_mfence();
559 }
560
561 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
562 {
563 struct ttm_bo_device *bdev = bo->bdev;
564 struct ttm_bo_global *glob = bo->glob;
565 struct ttm_bo_driver *driver = bdev->driver;
566 void *sync_obj = NULL;
567 int put_count;
568 int ret;
569
570 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
571 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
572
573 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
574 (void) ttm_bo_wait(bo, false, false, true);
575 if (!ret && !bo->sync_obj) {
576 lockmgr(&bdev->fence_lock, LK_RELEASE);
577 put_count = ttm_bo_del_from_lru(bo);
578
579 lockmgr(&glob->lru_lock, LK_RELEASE);
580 ttm_bo_cleanup_memtype_use(bo);
581
582 ttm_bo_list_ref_sub(bo, put_count, true);
583
584 return;
585 }
586 if (bo->sync_obj)
587 sync_obj = driver->sync_obj_ref(bo->sync_obj);
588 lockmgr(&bdev->fence_lock, LK_RELEASE);
589
590 if (!ret) {
591
592 /*
593 * Make NO_EVICT bos immediately available to
594 * shrinkers, now that they are queued for
595 * destruction.
596 */
597 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
598 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
599 ttm_bo_add_to_lru(bo);
600 }
601
602 ttm_bo_unreserve_core(bo);
603 }
604
605 kref_get(&bo->list_kref);
606 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
607 lockmgr(&glob->lru_lock, LK_RELEASE);
608
609 if (sync_obj) {
610 driver->sync_obj_flush(sync_obj);
611 driver->sync_obj_unref(&sync_obj);
612 }
613 schedule_delayed_work(&bdev->wq,
614 ((hz / 100) < 1) ? 1 : hz / 100);
615 }
616
617 /**
618 * function ttm_bo_cleanup_refs_and_unlock
619 * If bo idle, remove from delayed- and lru lists, and unref.
620 * If not idle, do nothing.
621 *
622 * Must be called with lru_lock and reservation held, this function
623 * will drop both before returning.
624 *
625 * @interruptible Any sleeps should occur interruptibly.
626 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
627 */
628
629 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
630 bool interruptible,
631 bool no_wait_gpu)
632 {
633 struct ttm_bo_device *bdev = bo->bdev;
634 struct ttm_bo_driver *driver = bdev->driver;
635 struct ttm_bo_global *glob = bo->glob;
636 int put_count;
637 int ret;
638
639 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
640 ret = ttm_bo_wait(bo, false, false, true);
641
642 if (ret && !no_wait_gpu) {
643 void *sync_obj;
644
645 /*
646 * Take a reference to the fence and unreserve,
647 * at this point the buffer should be dead, so
648 * no new sync objects can be attached.
649 */
650 sync_obj = driver->sync_obj_ref(bo->sync_obj);
651 lockmgr(&bdev->fence_lock, LK_RELEASE);
652
653 ttm_bo_unreserve_core(bo);
654 lockmgr(&glob->lru_lock, LK_RELEASE);
655
656 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
657 driver->sync_obj_unref(&sync_obj);
658 if (ret)
659 return ret;
660
661 /*
662 * remove sync_obj with ttm_bo_wait, the wait should be
663 * finished, and no new wait object should have been added.
664 */
665 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
666 ret = ttm_bo_wait(bo, false, false, true);
667 WARN_ON(ret);
668 lockmgr(&bdev->fence_lock, LK_RELEASE);
669 if (ret)
670 return ret;
671
672 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
673 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
674
675 /*
676 * We raced, and lost, someone else holds the reservation now,
677 * and is probably busy in ttm_bo_cleanup_memtype_use.
678 *
679 * Even if it's not the case, because we finished waiting any
680 * delayed destruction would succeed, so just return success
681 * here.
682 */
683 if (ret) {
684 lockmgr(&glob->lru_lock, LK_RELEASE);
685 return 0;
686 }
687 } else
688 lockmgr(&bdev->fence_lock, LK_RELEASE);
689
690 if (ret || unlikely(list_empty(&bo->ddestroy))) {
691 ttm_bo_unreserve_core(bo);
692 lockmgr(&glob->lru_lock, LK_RELEASE);
693 return ret;
694 }
695
696 put_count = ttm_bo_del_from_lru(bo);
697 list_del_init(&bo->ddestroy);
698 ++put_count;
699
700 lockmgr(&glob->lru_lock, LK_RELEASE);
701 ttm_bo_cleanup_memtype_use(bo);
702
703 ttm_bo_list_ref_sub(bo, put_count, true);
704
705 return 0;
706 }
707
708 /**
709 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
710 * encountered buffers.
711 */
712
713 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
714 {
715 struct ttm_bo_global *glob = bdev->glob;
716 struct ttm_buffer_object *entry = NULL;
717 int ret = 0;
718
719 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
720 if (list_empty(&bdev->ddestroy))
721 goto out_unlock;
722
723 entry = list_first_entry(&bdev->ddestroy,
724 struct ttm_buffer_object, ddestroy);
725 kref_get(&entry->list_kref);
726
727 for (;;) {
728 struct ttm_buffer_object *nentry = NULL;
729
730 if (entry->ddestroy.next != &bdev->ddestroy) {
731 nentry = list_first_entry(&entry->ddestroy,
732 struct ttm_buffer_object, ddestroy);
733 kref_get(&nentry->list_kref);
734 }
735
736 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
737 if (remove_all && ret) {
738 lockmgr(&glob->lru_lock, LK_RELEASE);
739 ret = ttm_bo_reserve_nolru(entry, false, false,
740 false, 0);
741 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
742 }
743
744 if (!ret)
745 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
746 !remove_all);
747 else
748 lockmgr(&glob->lru_lock, LK_RELEASE);
749
750 kref_put(&entry->list_kref, ttm_bo_release_list);
751 entry = nentry;
752
753 if (ret || !entry)
754 goto out;
755
756 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
757 if (list_empty(&entry->ddestroy))
758 break;
759 }
760
761 out_unlock:
762 lockmgr(&glob->lru_lock, LK_RELEASE);
763 out:
764 if (entry)
765 kref_put(&entry->list_kref, ttm_bo_release_list);
766 return ret;
767 }
768
769 static void ttm_bo_delayed_workqueue(struct work_struct *work)
770 {
771 struct ttm_bo_device *bdev =
772 container_of(work, struct ttm_bo_device, wq.work);
773
774 if (ttm_bo_delayed_delete(bdev, false)) {
775 schedule_delayed_work(&bdev->wq,
776 ((hz / 100) < 1) ? 1 : hz / 100);
777 }
778 }
779
780 /*
781 * NOTE: bdev->vm_lock already held on call, this function release it.
782 */
783 static void ttm_bo_release(struct kref *kref)
784 {
785 struct ttm_buffer_object *bo =
786 container_of(kref, struct ttm_buffer_object, kref);
787 struct ttm_bo_device *bdev = bo->bdev;
788 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
789 int release_active;
790
791 if (atomic_read(&bo->kref.refcount) > 0) {
792 lockmgr(&bdev->vm_lock, LK_RELEASE);
793 return;
794 }
795 if (likely(bo->vm_node != NULL)) {
796 RB_REMOVE(ttm_bo_device_buffer_objects,
797 &bdev->addr_space_rb, bo);
798 drm_mm_put_block(bo->vm_node);
799 bo->vm_node = NULL;
800 }
801
802 /*
803 * Should we clean up our implied list_kref? Because ttm_bo_release()
804 * can be called reentrantly due to races (this may not be true any
805 * more with the lock management changes in the deref), it is possible
806 * to get here twice, but there's only one list_kref ref to drop and
807 * in the other path 'bo' can be kfree()d by another thread the
808 * instant we release our lock.
809 */
810 release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
811 if (release_active) {
812 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
813 lockmgr(&bdev->vm_lock, LK_RELEASE);
814 ttm_mem_io_lock(man, false);
815 ttm_mem_io_free_vm(bo);
816 ttm_mem_io_unlock(man);
817 ttm_bo_cleanup_refs_or_queue(bo);
818 kref_put(&bo->list_kref, ttm_bo_release_list);
819 } else {
820 lockmgr(&bdev->vm_lock, LK_RELEASE);
821 }
822 }
823
824 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
825 {
826 struct ttm_buffer_object *bo = *p_bo;
827 struct ttm_bo_device *bdev = bo->bdev;
828
829 *p_bo = NULL;
830 lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
831 if (kref_put(&bo->kref, ttm_bo_release) == 0)
832 lockmgr(&bdev->vm_lock, LK_RELEASE);
833 }
834 EXPORT_SYMBOL(ttm_bo_unref);
835
836 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
837 {
838 return cancel_delayed_work_sync(&bdev->wq);
839 }
840 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
841
842 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
843 {
844 if (resched)
845 schedule_delayed_work(&bdev->wq,
846 ((hz / 100) < 1) ? 1 : hz / 100);
847 }
848 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
849
850 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
851 bool no_wait_gpu)
852 {
853 struct ttm_bo_device *bdev = bo->bdev;
854 struct ttm_mem_reg evict_mem;
855 struct ttm_placement placement;
856 int ret = 0;
857
858 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
859 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
860 lockmgr(&bdev->fence_lock, LK_RELEASE);
861
862 if (unlikely(ret != 0)) {
863 if (ret != -ERESTARTSYS) {
864 pr_err("Failed to expire sync object before buffer eviction\n");
865 }
866 goto out;
867 }
868
869 BUG_ON(!ttm_bo_is_reserved(bo));
870
871 evict_mem = bo->mem;
872 evict_mem.mm_node = NULL;
873 evict_mem.bus.io_reserved_vm = false;
874 evict_mem.bus.io_reserved_count = 0;
875
876 placement.num_placement = 0;
877 placement.num_busy_placement = 0;
878 bdev->driver->evict_flags(bo, &placement);
879 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
880 no_wait_gpu);
881 if (ret) {
882 if (ret != -ERESTARTSYS) {
883 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
884 bo);
885 ttm_bo_mem_space_debug(bo, &placement);
886 }
887 goto out;
888 }
889
890 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
891 no_wait_gpu);
892 if (ret) {
893 if (ret != -ERESTARTSYS)
894 pr_err("Buffer eviction failed\n");
895 ttm_bo_mem_put(bo, &evict_mem);
896 goto out;
897 }
898 bo->evicted = true;
899 out:
900 return ret;
901 }
902
903 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
904 uint32_t mem_type,
905 bool interruptible,
906 bool no_wait_gpu)
907 {
908 struct ttm_bo_global *glob = bdev->glob;
909 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
910 struct ttm_buffer_object *bo;
911 int ret = -EBUSY, put_count;
912
913 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
914 list_for_each_entry(bo, &man->lru, lru) {
915 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
916 if (!ret)
917 break;
918 }
919
920 if (ret) {
921 lockmgr(&glob->lru_lock, LK_RELEASE);
922 return ret;
923 }
924
925 kref_get(&bo->list_kref);
926
927 if (!list_empty(&bo->ddestroy)) {
928 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
929 no_wait_gpu);
930 kref_put(&bo->list_kref, ttm_bo_release_list);
931 return ret;
932 }
933
934 put_count = ttm_bo_del_from_lru(bo);
935 lockmgr(&glob->lru_lock, LK_RELEASE);
936
937 BUG_ON(ret != 0);
938
939 ttm_bo_list_ref_sub(bo, put_count, true);
940
941 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
942 ttm_bo_unreserve(bo);
943
944 kref_put(&bo->list_kref, ttm_bo_release_list);
945 return ret;
946 }
947
948 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
949 {
950 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
951
952 if (mem->mm_node)
953 (*man->func->put_node)(man, mem);
954 }
955 EXPORT_SYMBOL(ttm_bo_mem_put);
956
957 /**
958 * Repeatedly evict memory from the LRU for @mem_type until we create enough
959 * space, or we've evicted everything and there isn't enough space.
960 */
961 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
962 uint32_t mem_type,
963 const struct ttm_place *place,
964 struct ttm_mem_reg *mem,
965 bool interruptible,
966 bool no_wait_gpu)
967 {
968 struct ttm_bo_device *bdev = bo->bdev;
969 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
970 int ret;
971
972 do {
973 ret = (*man->func->get_node)(man, bo, place, mem);
974 if (unlikely(ret != 0))
975 return ret;
976 if (mem->mm_node)
977 break;
978 ret = ttm_mem_evict_first(bdev, mem_type,
979 interruptible, no_wait_gpu);
980 if (unlikely(ret != 0))
981 return ret;
982 } while (1);
983 if (mem->mm_node == NULL)
984 return -ENOMEM;
985 mem->mem_type = mem_type;
986 return 0;
987 }
988
989 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
990 uint32_t cur_placement,
991 uint32_t proposed_placement)
992 {
993 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
994 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
995
996 /**
997 * Keep current caching if possible.
998 */
999
1000 if ((cur_placement & caching) != 0)
1001 result |= (cur_placement & caching);
1002 else if ((man->default_caching & caching) != 0)
1003 result |= man->default_caching;
1004 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1005 result |= TTM_PL_FLAG_CACHED;
1006 else if ((TTM_PL_FLAG_WC & caching) != 0)
1007 result |= TTM_PL_FLAG_WC;
1008 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1009 result |= TTM_PL_FLAG_UNCACHED;
1010
1011 return result;
1012 }
1013
1014 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1015 uint32_t mem_type,
1016 const struct ttm_place *place,
1017 uint32_t *masked_placement)
1018 {
1019 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1020
1021 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1022 return false;
1023
1024 if ((place->flags & man->available_caching) == 0)
1025 return false;
1026
1027 cur_flags |= (place->flags & man->available_caching);
1028
1029 *masked_placement = cur_flags;
1030 return true;
1031 }
1032
1033 /**
1034 * Creates space for memory region @mem according to its type.
1035 *
1036 * This function first searches for free space in compatible memory types in
1037 * the priority order defined by the driver. If free space isn't found, then
1038 * ttm_bo_mem_force_space is attempted in priority order to evict and find
1039 * space.
1040 */
1041 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1042 struct ttm_placement *placement,
1043 struct ttm_mem_reg *mem,
1044 bool interruptible,
1045 bool no_wait_gpu)
1046 {
1047 struct ttm_bo_device *bdev = bo->bdev;
1048 struct ttm_mem_type_manager *man;
1049 uint32_t mem_type = TTM_PL_SYSTEM;
1050 uint32_t cur_flags = 0;
1051 bool type_found = false;
1052 bool type_ok = false;
1053 bool has_erestartsys = false;
1054 int i, ret;
1055
1056 mem->mm_node = NULL;
1057 for (i = 0; i < placement->num_placement; ++i) {
1058 const struct ttm_place *place = &placement->placement[i];
1059
1060 ret = ttm_mem_type_from_place(place, &mem_type);
1061 if (ret)
1062 return ret;
1063 man = &bdev->man[mem_type];
1064
1065 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
1066 &cur_flags);
1067
1068 if (!type_ok)
1069 continue;
1070
1071 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1072 cur_flags);
1073 /*
1074 * Use the access and other non-mapping-related flag bits from
1075 * the memory placement flags to the current flags
1076 */
1077 ttm_flag_masked(&cur_flags, place->flags,
1078 ~TTM_PL_MASK_MEMTYPE);
1079
1080 if (mem_type == TTM_PL_SYSTEM)
1081 break;
1082
1083 if (man->has_type && man->use_type) {
1084 type_found = true;
1085 ret = (*man->func->get_node)(man, bo, place, mem);
1086 if (unlikely(ret))
1087 return ret;
1088 }
1089 if (mem->mm_node)
1090 break;
1091 }
1092
1093 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1094 mem->mem_type = mem_type;
1095 mem->placement = cur_flags;
1096 return 0;
1097 }
1098
1099 if (!type_found)
1100 return -EINVAL;
1101
1102 for (i = 0; i < placement->num_busy_placement; ++i) {
1103 const struct ttm_place *place = &placement->busy_placement[i];
1104
1105 ret = ttm_mem_type_from_place(place, &mem_type);
1106 if (ret)
1107 return ret;
1108 man = &bdev->man[mem_type];
1109 if (!man->has_type)
1110 continue;
1111 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1112 continue;
1113
1114 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1115 cur_flags);
1116 /*
1117 * Use the access and other non-mapping-related flag bits from
1118 * the memory placement flags to the current flags
1119 */
1120 ttm_flag_masked(&cur_flags, place->flags,
1121 ~TTM_PL_MASK_MEMTYPE);
1122
1123 if (mem_type == TTM_PL_SYSTEM) {
1124 mem->mem_type = mem_type;
1125 mem->placement = cur_flags;
1126 mem->mm_node = NULL;
1127 return 0;
1128 }
1129
1130 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1131 interruptible, no_wait_gpu);
1132 if (ret == 0 && mem->mm_node) {
1133 mem->placement = cur_flags;
1134 return 0;
1135 }
1136 if (ret == -ERESTARTSYS)
1137 has_erestartsys = true;
1138 }
1139 ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1140 return ret;
1141 }
1142 EXPORT_SYMBOL(ttm_bo_mem_space);
1143
1144 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1145 struct ttm_placement *placement,
1146 bool interruptible,
1147 bool no_wait_gpu)
1148 {
1149 int ret = 0;
1150 struct ttm_mem_reg mem;
1151 struct ttm_bo_device *bdev = bo->bdev;
1152
1153 BUG_ON(!ttm_bo_is_reserved(bo));
1154
1155 /*
1156 * FIXME: It's possible to pipeline buffer moves.
1157 * Have the driver move function wait for idle when necessary,
1158 * instead of doing it here.
1159 */
1160 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1161 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1162 lockmgr(&bdev->fence_lock, LK_RELEASE);
1163 if (ret)
1164 return ret;
1165 mem.num_pages = bo->num_pages;
1166 mem.size = mem.num_pages << PAGE_SHIFT;
1167 mem.page_alignment = bo->mem.page_alignment;
1168 mem.bus.io_reserved_vm = false;
1169 mem.bus.io_reserved_count = 0;
1170 /*
1171 * Determine where to move the buffer.
1172 */
1173 ret = ttm_bo_mem_space(bo, placement, &mem,
1174 interruptible, no_wait_gpu);
1175 if (ret)
1176 goto out_unlock;
1177 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1178 interruptible, no_wait_gpu);
1179 out_unlock:
1180 if (ret && mem.mm_node)
1181 ttm_bo_mem_put(bo, &mem);
1182 return ret;
1183 }
1184
1185 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1186 struct ttm_mem_reg *mem,
1187 uint32_t *new_flags)
1188 {
1189 int i;
1190
1191 for (i = 0; i < placement->num_placement; i++) {
1192 const struct ttm_place *heap = &placement->placement[i];
1193 if (mem->mm_node &&
1194 (mem->start < heap->fpfn ||
1195 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1196 continue;
1197
1198 *new_flags = heap->flags;
1199 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1200 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1201 return true;
1202 }
1203
1204 for (i = 0; i < placement->num_busy_placement; i++) {
1205 const struct ttm_place *heap = &placement->busy_placement[i];
1206 if (mem->mm_node &&
1207 (mem->start < heap->fpfn ||
1208 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1209 continue;
1210
1211 *new_flags = heap->flags;
1212 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1213 (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1214 return true;
1215 }
1216
1217 return false;
1218 }
1219
1220 int ttm_bo_validate(struct ttm_buffer_object *bo,
1221 struct ttm_placement *placement,
1222 bool interruptible,
1223 bool no_wait_gpu)
1224 {
1225 int ret;
1226 uint32_t new_flags;
1227
1228 BUG_ON(!ttm_bo_is_reserved(bo));
1229 /*
1230 * Check whether we need to move buffer.
1231 */
1232 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1233 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1234 no_wait_gpu);
1235 if (ret)
1236 return ret;
1237 } else {
1238 /*
1239 * Use the access and other non-mapping-related flag bits from
1240 * the compatible memory placement flags to the active flags
1241 */
1242 ttm_flag_masked(&bo->mem.placement, new_flags,
1243 ~TTM_PL_MASK_MEMTYPE);
1244 }
1245 /*
1246 * We might need to add a TTM.
1247 */
1248 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1249 ret = ttm_bo_add_ttm(bo, true);
1250 if (ret)
1251 return ret;
1252 }
1253 return 0;
1254 }
1255 EXPORT_SYMBOL(ttm_bo_validate);
1256
1257 int ttm_bo_init(struct ttm_bo_device *bdev,
1258 struct ttm_buffer_object *bo,
1259 unsigned long size,
1260 enum ttm_bo_type type,
1261 struct ttm_placement *placement,
1262 uint32_t page_alignment,
1263 bool interruptible,
1264 struct vm_object *persistent_swap_storage,
1265 size_t acc_size,
1266 struct sg_table *sg,
1267 void (*destroy) (struct ttm_buffer_object *))
1268 {
1269 int ret = 0;
1270 unsigned long num_pages;
1271 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1272
1273 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1274 if (ret) {
1275 pr_err("Out of kernel memory\n");
1276 if (destroy)
1277 (*destroy)(bo);
1278 else
1279 kfree(bo);
1280 return -ENOMEM;
1281 }
1282
1283 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1284 if (num_pages == 0) {
1285 pr_err("Illegal buffer object size\n");
1286 if (destroy)
1287 (*destroy)(bo);
1288 else
1289 kfree(bo);
1290 ttm_mem_global_free(mem_glob, acc_size);
1291 return -EINVAL;
1292 }
1293 bo->destroy = destroy;
1294
1295 kref_init(&bo->kref);
1296 kref_init(&bo->list_kref);
1297 atomic_set(&bo->cpu_writers, 0);
1298 atomic_set(&bo->reserved, 1);
1299 init_waitqueue_head(&bo->event_queue);
1300 INIT_LIST_HEAD(&bo->lru);
1301 INIT_LIST_HEAD(&bo->ddestroy);
1302 INIT_LIST_HEAD(&bo->swap);
1303 INIT_LIST_HEAD(&bo->io_reserve_lru);
1304 /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1305 bo->bdev = bdev;
1306 bo->glob = bdev->glob;
1307 bo->type = type;
1308 bo->num_pages = num_pages;
1309 bo->mem.size = num_pages << PAGE_SHIFT;
1310 bo->mem.mem_type = TTM_PL_SYSTEM;
1311 bo->mem.num_pages = bo->num_pages;
1312 bo->mem.mm_node = NULL;
1313 bo->mem.page_alignment = page_alignment;
1314 bo->mem.bus.io_reserved_vm = false;
1315 bo->mem.bus.io_reserved_count = 0;
1316 bo->priv_flags = 0;
1317 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1318 bo->seq_valid = false;
1319 bo->persistent_swap_storage = persistent_swap_storage;
1320 bo->acc_size = acc_size;
1321 bo->sg = sg;
1322 atomic_inc(&bo->glob->bo_count);
1323
1324 /*
1325 * Mirror ref from kref_init() for list_kref.
1326 */
1327 set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1328
1329 /*
1330 * For ttm_bo_type_device buffers, allocate
1331 * address space from the device.
1332 */
1333 if (bo->type == ttm_bo_type_device ||
1334 bo->type == ttm_bo_type_sg) {
1335 ret = ttm_bo_setup_vm(bo);
1336 if (ret)
1337 goto out_err;
1338 }
1339
1340 ret = ttm_bo_validate(bo, placement, interruptible, false);
1341 if (ret)
1342 goto out_err;
1343
1344 ttm_bo_unreserve(bo);
1345 return 0;
1346
1347 out_err:
1348 ttm_bo_unreserve(bo);
1349 ttm_bo_unref(&bo);
1350
1351 return ret;
1352 }
1353 EXPORT_SYMBOL(ttm_bo_init);
1354
1355 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1356 unsigned long bo_size,
1357 unsigned struct_size)
1358 {
1359 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1360 size_t size = 0;
1361
1362 size += ttm_round_pot(struct_size);
1363 size += PAGE_ALIGN(npages * sizeof(void *));
1364 size += ttm_round_pot(sizeof(struct ttm_tt));
1365 return size;
1366 }
1367 EXPORT_SYMBOL(ttm_bo_acc_size);
1368
1369 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1370 unsigned long bo_size,
1371 unsigned struct_size)
1372 {
1373 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1374 size_t size = 0;
1375
1376 size += ttm_round_pot(struct_size);
1377 size += PAGE_ALIGN(npages * sizeof(void *));
1378 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1379 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1380 return size;
1381 }
1382 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1383
1384 int ttm_bo_create(struct ttm_bo_device *bdev,
1385 unsigned long size,
1386 enum ttm_bo_type type,
1387 struct ttm_placement *placement,
1388 uint32_t page_alignment,
1389 bool interruptible,
1390 struct vm_object *persistent_swap_storage,
1391 struct ttm_buffer_object **p_bo)
1392 {
1393 struct ttm_buffer_object *bo;
1394 size_t acc_size;
1395 int ret;
1396
1397 *p_bo = NULL;
1398 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1399 if (unlikely(bo == NULL))
1400 return -ENOMEM;
1401
1402 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1403 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1404 interruptible, persistent_swap_storage, acc_size,
1405 NULL, NULL);
1406 if (likely(ret == 0))
1407 *p_bo = bo;
1408
1409 return ret;
1410 }
1411 EXPORT_SYMBOL(ttm_bo_create);
1412
1413 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1414 unsigned mem_type, bool allow_errors)
1415 {
1416 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1417 struct ttm_bo_global *glob = bdev->glob;
1418 int ret;
1419
1420 /*
1421 * Can't use standard list traversal since we're unlocking.
1422 */
1423
1424 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1425 while (!list_empty(&man->lru)) {
1426 lockmgr(&glob->lru_lock, LK_RELEASE);
1427 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1428 if (ret) {
1429 if (allow_errors) {
1430 return ret;
1431 } else {
1432 pr_err("Cleanup eviction failed\n");
1433 }
1434 }
1435 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1436 }
1437 lockmgr(&glob->lru_lock, LK_RELEASE);
1438 return 0;
1439 }
1440
1441 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1442 {
1443 struct ttm_mem_type_manager *man;
1444 int ret = -EINVAL;
1445
1446 if (mem_type >= TTM_NUM_MEM_TYPES) {
1447 pr_err("Illegal memory type %d\n", mem_type);
1448 return ret;
1449 }
1450 man = &bdev->man[mem_type];
1451
1452 if (!man->has_type) {
1453 pr_err("Trying to take down uninitialized memory manager type %u\n",
1454 mem_type);
1455 return ret;
1456 }
1457
1458 man->use_type = false;
1459 man->has_type = false;
1460
1461 ret = 0;
1462 if (mem_type > 0) {
1463 ttm_bo_force_list_clean(bdev, mem_type, false);
1464
1465 ret = (*man->func->takedown)(man);
1466 }
1467
1468 return ret;
1469 }
1470 EXPORT_SYMBOL(ttm_bo_clean_mm);
1471
1472 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1473 {
1474 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1475
1476 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1477 pr_err("Illegal memory manager memory type %u\n", mem_type);
1478 return -EINVAL;
1479 }
1480
1481 if (!man->has_type) {
1482 pr_err("Memory type %u has not been initialized\n", mem_type);
1483 return 0;
1484 }
1485
1486 return ttm_bo_force_list_clean(bdev, mem_type, true);
1487 }
1488 EXPORT_SYMBOL(ttm_bo_evict_mm);
1489
1490 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1491 unsigned long p_size)
1492 {
1493 int ret = -EINVAL;
1494 struct ttm_mem_type_manager *man;
1495
1496 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1497 man = &bdev->man[type];
1498 BUG_ON(man->has_type);
1499 man->io_reserve_fastpath = true;
1500 man->use_io_reserve_lru = false;
1501 lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1502 INIT_LIST_HEAD(&man->io_reserve_lru);
1503
1504 ret = bdev->driver->init_mem_type(bdev, type, man);
1505 if (ret)
1506 return ret;
1507 man->bdev = bdev;
1508
1509 ret = 0;
1510 if (type != TTM_PL_SYSTEM) {
1511 ret = (*man->func->init)(man, p_size);
1512 if (ret)
1513 return ret;
1514 }
1515 man->has_type = true;
1516 man->use_type = true;
1517 man->size = p_size;
1518
1519 INIT_LIST_HEAD(&man->lru);
1520
1521 return 0;
1522 }
1523 EXPORT_SYMBOL(ttm_bo_init_mm);
1524
1525 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1526 {
1527 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1528 vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1529 glob->dummy_read_page = NULL;
1530 /*
1531 vm_page_free(glob->dummy_read_page);
1532 */
1533 }
1534
1535 void ttm_bo_global_release(struct drm_global_reference *ref)
1536 {
1537 struct ttm_bo_global *glob = ref->object;
1538
1539 if (refcount_release(&glob->kobj_ref))
1540 ttm_bo_global_kobj_release(glob);
1541 }
1542 EXPORT_SYMBOL(ttm_bo_global_release);
1543
1544 int ttm_bo_global_init(struct drm_global_reference *ref)
1545 {
1546 struct ttm_bo_global_ref *bo_ref =
1547 container_of(ref, struct ttm_bo_global_ref, ref);
1548 struct ttm_bo_global *glob = ref->object;
1549 int ret;
1550
1551 lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1552 lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1553 glob->mem_glob = bo_ref->mem_glob;
1554 glob->dummy_read_page = vm_page_alloc_contig(
1555 0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1556
1557 if (unlikely(glob->dummy_read_page == NULL)) {
1558 ret = -ENOMEM;
1559 goto out_no_drp;
1560 }
1561
1562 INIT_LIST_HEAD(&glob->swap_lru);
1563 INIT_LIST_HEAD(&glob->device_list);
1564
1565 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1566 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1567 if (unlikely(ret != 0)) {
1568 pr_err("Could not register buffer object swapout\n");
1569 goto out_no_shrink;
1570 }
1571
1572 atomic_set(&glob->bo_count, 0);
1573
1574 refcount_init(&glob->kobj_ref, 1);
1575 return (0);
1576
1577 out_no_shrink:
1578 vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1579 glob->dummy_read_page = NULL;
1580 /*
1581 vm_page_free(glob->dummy_read_page);
1582 */
1583 out_no_drp:
1584 kfree(glob);
1585 return ret;
1586 }
1587 EXPORT_SYMBOL(ttm_bo_global_init);
1588
1589
1590 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1591 {
1592 int ret = 0;
1593 unsigned i = TTM_NUM_MEM_TYPES;
1594 struct ttm_mem_type_manager *man;
1595 struct ttm_bo_global *glob = bdev->glob;
1596
1597 while (i--) {
1598 man = &bdev->man[i];
1599 if (man->has_type) {
1600 man->use_type = false;
1601 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1602 ret = -EBUSY;
1603 pr_err("DRM memory manager type %d is not clean\n",
1604 i);
1605 }
1606 man->has_type = false;
1607 }
1608 }
1609
1610 lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1611 list_del(&bdev->device_list);
1612 lockmgr(&glob->device_list_mutex, LK_RELEASE);
1613
1614 cancel_delayed_work_sync(&bdev->wq);
1615
1616 while (ttm_bo_delayed_delete(bdev, true))
1617 ;
1618
1619 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1620 if (list_empty(&bdev->ddestroy))
1621 TTM_DEBUG("Delayed destroy list was clean\n");
1622
1623 if (list_empty(&bdev->man[0].lru))
1624 TTM_DEBUG("Swap list was clean\n");
1625 lockmgr(&glob->lru_lock, LK_RELEASE);
1626
1627 BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1628 lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1629 drm_mm_takedown(&bdev->addr_space_mm);
1630 lockmgr(&bdev->vm_lock, LK_RELEASE);
1631
1632 return ret;
1633 }
1634 EXPORT_SYMBOL(ttm_bo_device_release);
1635
1636 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1637 struct ttm_bo_global *glob,
1638 struct ttm_bo_driver *driver,
1639 uint64_t file_page_offset,
1640 bool need_dma32)
1641 {
1642 int ret = -EINVAL;
1643
1644 lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1645 bdev->driver = driver;
1646
1647 memset(bdev->man, 0, sizeof(bdev->man));
1648
1649 /*
1650 * Initialize the system memory buffer type.
1651 * Other types need to be driver / IOCTL initialized.
1652 */
1653 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1654 if (unlikely(ret != 0))
1655 goto out_no_sys;
1656
1657 RB_INIT(&bdev->addr_space_rb);
1658 drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1659
1660 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1661 INIT_LIST_HEAD(&bdev->ddestroy);
1662 bdev->dev_mapping = NULL;
1663 bdev->glob = glob;
1664 bdev->need_dma32 = need_dma32;
1665 bdev->val_seq = 0;
1666 lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1667 lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1668 list_add_tail(&bdev->device_list, &glob->device_list);
1669 lockmgr(&glob->device_list_mutex, LK_RELEASE);
1670
1671 return 0;
1672 out_no_sys:
1673 return ret;
1674 }
1675 EXPORT_SYMBOL(ttm_bo_device_init);
1676
1677 /*
1678 * buffer object vm functions.
1679 */
1680
1681 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1682 {
1683 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1684
1685 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1686 if (mem->mem_type == TTM_PL_SYSTEM)
1687 return false;
1688
1689 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1690 return false;
1691
1692 if (mem->placement & TTM_PL_FLAG_CACHED)
1693 return false;
1694 }
1695 return true;
1696 }
1697
1698 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1699 {
1700
1701 ttm_bo_release_mmap(bo);
1702 ttm_mem_io_free_vm(bo);
1703 }
1704
1705 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1706 {
1707 struct ttm_bo_device *bdev = bo->bdev;
1708 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1709
1710 ttm_mem_io_lock(man, false);
1711 ttm_bo_unmap_virtual_locked(bo);
1712 ttm_mem_io_unlock(man);
1713 }
1714
1715
1716 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1717
1718 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1719 {
1720 struct ttm_bo_device *bdev = bo->bdev;
1721
1722 /* The caller acquired bdev->vm_lock. */
1723 RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1724 }
1725
1726 /**
1727 * ttm_bo_setup_vm:
1728 *
1729 * @bo: the buffer to allocate address space for
1730 *
1731 * Allocate address space in the drm device so that applications
1732 * can mmap the buffer and access the contents. This only
1733 * applies to ttm_bo_type_device objects as others are not
1734 * placed in the drm device address space.
1735 */
1736
1737 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1738 {
1739 struct ttm_bo_device *bdev = bo->bdev;
1740 int ret;
1741
1742 retry_pre_get:
1743 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1744 if (unlikely(ret != 0))
1745 return ret;
1746
1747 lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1748 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1749 bo->mem.num_pages, 0, 0);
1750
1751 if (unlikely(bo->vm_node == NULL)) {
1752 ret = -ENOMEM;
1753 goto out_unlock;
1754 }
1755
1756 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1757 bo->mem.num_pages, 0);
1758
1759 if (unlikely(bo->vm_node == NULL)) {
1760 lockmgr(&bdev->vm_lock, LK_RELEASE);
1761 goto retry_pre_get;
1762 }
1763
1764 ttm_bo_vm_insert_rb(bo);
1765 lockmgr(&bdev->vm_lock, LK_RELEASE);
1766 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1767
1768 return 0;
1769 out_unlock:
1770 lockmgr(&bdev->vm_lock, LK_RELEASE);
1771 return ret;
1772 }
1773
1774 int ttm_bo_wait(struct ttm_buffer_object *bo,
1775 bool lazy, bool interruptible, bool no_wait)
1776 {
1777 struct ttm_bo_driver *driver = bo->bdev->driver;
1778 struct ttm_bo_device *bdev = bo->bdev;
1779 void *sync_obj;
1780 int ret = 0;
1781
1782 if (likely(bo->sync_obj == NULL))
1783 return 0;
1784
1785 while (bo->sync_obj) {
1786
1787 if (driver->sync_obj_signaled(bo->sync_obj)) {
1788 void *tmp_obj = bo->sync_obj;
1789 bo->sync_obj = NULL;
1790 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1791 lockmgr(&bdev->fence_lock, LK_RELEASE);
1792 driver->sync_obj_unref(&tmp_obj);
1793 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1794 continue;
1795 }
1796
1797 if (no_wait)
1798 return -EBUSY;
1799
1800 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1801 lockmgr(&bdev->fence_lock, LK_RELEASE);
1802 ret = driver->sync_obj_wait(sync_obj,
1803 lazy, interruptible);
1804 if (unlikely(ret != 0)) {
1805 driver->sync_obj_unref(&sync_obj);
1806 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1807 return ret;
1808 }
1809 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1810 if (likely(bo->sync_obj == sync_obj)) {
1811 void *tmp_obj = bo->sync_obj;
1812 bo->sync_obj = NULL;
1813 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1814 &bo->priv_flags);
1815 lockmgr(&bdev->fence_lock, LK_RELEASE);
1816 driver->sync_obj_unref(&sync_obj);
1817 driver->sync_obj_unref(&tmp_obj);
1818 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1819 } else {
1820 lockmgr(&bdev->fence_lock, LK_RELEASE);
1821 driver->sync_obj_unref(&sync_obj);
1822 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1823 }
1824 }
1825 return 0;
1826 }
1827 EXPORT_SYMBOL(ttm_bo_wait);
1828
1829 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1830 {
1831 struct ttm_bo_device *bdev = bo->bdev;
1832 int ret = 0;
1833
1834 /*
1835 * Using ttm_bo_reserve makes sure the lru lists are updated.
1836 */
1837
1838 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1839 if (unlikely(ret != 0))
1840 return ret;
1841 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1842 ret = ttm_bo_wait(bo, false, true, no_wait);
1843 lockmgr(&bdev->fence_lock, LK_RELEASE);
1844 if (likely(ret == 0))
1845 atomic_inc(&bo->cpu_writers);
1846 ttm_bo_unreserve(bo);
1847 return ret;
1848 }
1849 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1850
1851 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1852 {
1853 atomic_dec(&bo->cpu_writers);
1854 }
1855 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1856
1857 /**
1858 * A buffer object shrink method that tries to swap out the first
1859 * buffer object on the bo_global::swap_lru list.
1860 */
1861
1862 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1863 {
1864 struct ttm_bo_global *glob =
1865 container_of(shrink, struct ttm_bo_global, shrink);
1866 struct ttm_buffer_object *bo;
1867 int ret = -EBUSY;
1868 int put_count;
1869 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1870
1871 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1872 list_for_each_entry(bo, &glob->swap_lru, swap) {
1873 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1874 if (!ret)
1875 break;
1876 }
1877
1878 if (ret) {
1879 lockmgr(&glob->lru_lock, LK_RELEASE);
1880 return ret;
1881 }
1882
1883 kref_get(&bo->list_kref);
1884
1885 if (!list_empty(&bo->ddestroy)) {
1886 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1887 kref_put(&bo->list_kref, ttm_bo_release_list);
1888 return ret;
1889 }
1890
1891 put_count = ttm_bo_del_from_lru(bo);
1892 lockmgr(&glob->lru_lock, LK_RELEASE);
1893
1894 ttm_bo_list_ref_sub(bo, put_count, true);
1895
1896 /**
1897 * Wait for GPU, then move to system cached.
1898 */
1899
1900 lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1901 ret = ttm_bo_wait(bo, false, false, false);
1902 lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1903
1904 if (unlikely(ret != 0))
1905 goto out;
1906
1907 if ((bo->mem.placement & swap_placement) != swap_placement) {
1908 struct ttm_mem_reg evict_mem;
1909
1910 evict_mem = bo->mem;
1911 evict_mem.mm_node = NULL;
1912 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1913 evict_mem.mem_type = TTM_PL_SYSTEM;
1914
1915 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1916 false, false);
1917 if (unlikely(ret != 0))
1918 goto out;
1919 }
1920
1921 ttm_bo_unmap_virtual(bo);
1922
1923 /**
1924 * Swap out. Buffer will be swapped in again as soon as
1925 * anyone tries to access a ttm page.
1926 */
1927
1928 if (bo->bdev->driver->swap_notify)
1929 bo->bdev->driver->swap_notify(bo);
1930
1931 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1932 out:
1933
1934 /**
1935 *
1936 * Unreserve without putting on LRU to avoid swapping out an
1937 * already swapped buffer.
1938 */
1939
1940 ttm_bo_unreserve_core(bo);
1941 kref_put(&bo->list_kref, ttm_bo_release_list);
1942 return ret;
1943 }
1944
1945 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1946 {
1947 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1948 ;
1949 }
1950 EXPORT_SYMBOL(ttm_bo_swapout_all);
DragonFly BSD