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1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/sys/dev/drm2/ttm/ttm_bo.c 254862 2013-08-25 14:41:22Z dumbbell $");
32__FBSDID("$FreeBSD: head/sys/dev/drm2/ttm/ttm_bo.c 254863 2013-08-25 14:47:22Z dumbbell $");
33
34#include <dev/drm2/drmP.h>
35#include <dev/drm2/ttm/ttm_module.h>
36#include <dev/drm2/ttm/ttm_bo_driver.h>
37#include <dev/drm2/ttm/ttm_placement.h>
38
39#define TTM_ASSERT_LOCKED(param)
40#define TTM_DEBUG(fmt, arg...)
41#define TTM_BO_HASH_ORDER 13
42
43static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
44static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
45static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob);
46
47MALLOC_DEFINE(M_TTM_BO, "ttm_bo", "TTM Buffer Objects");
48
49static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
50{
51 int i;
52
53 for (i = 0; i <= TTM_PL_PRIV5; i++)
54 if (flags & (1 << i)) {
55 *mem_type = i;
56 return 0;
57 }
58 return -EINVAL;
59}
60
61static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
62{
63 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
64
65 printf(" has_type: %d\n", man->has_type);
66 printf(" use_type: %d\n", man->use_type);
67 printf(" flags: 0x%08X\n", man->flags);
68 printf(" gpu_offset: 0x%08lX\n", man->gpu_offset);
69 printf(" size: %ju\n", (uintmax_t)man->size);
70 printf(" available_caching: 0x%08X\n", man->available_caching);
71 printf(" default_caching: 0x%08X\n", man->default_caching);
72 if (mem_type != TTM_PL_SYSTEM)
73 (*man->func->debug)(man, TTM_PFX);
74}
75
76static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
77 struct ttm_placement *placement)
78{
79 int i, ret, mem_type;
80
81 printf("No space for %p (%lu pages, %luK, %luM)\n",
82 bo, bo->mem.num_pages, bo->mem.size >> 10,
83 bo->mem.size >> 20);
84 for (i = 0; i < placement->num_placement; i++) {
85 ret = ttm_mem_type_from_flags(placement->placement[i],
86 &mem_type);
87 if (ret)
88 return;
89 printf(" placement[%d]=0x%08X (%d)\n",
90 i, placement->placement[i], mem_type);
91 ttm_mem_type_debug(bo->bdev, mem_type);
92 }
93}
94
95#if 0
96static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
97 char *buffer)
98{
99
100 return snprintf(buffer, PAGE_SIZE, "%lu\n",
101 (unsigned long) atomic_read(&glob->bo_count));
102}
103#endif
104
105static inline uint32_t ttm_bo_type_flags(unsigned type)
106{
107 return 1 << (type);
108}
109
110static void ttm_bo_release_list(struct ttm_buffer_object *bo)
111{
112 struct ttm_bo_device *bdev = bo->bdev;
113 size_t acc_size = bo->acc_size;
114
115 MPASS(atomic_read(&bo->list_kref) == 0);
116 MPASS(atomic_read(&bo->kref) == 0);
117 MPASS(atomic_read(&bo->cpu_writers) == 0);
118 MPASS(bo->sync_obj == NULL);
119 MPASS(bo->mem.mm_node == NULL);
120 MPASS(list_empty(&bo->lru));
121 MPASS(list_empty(&bo->ddestroy));
122
123 if (bo->ttm)
124 ttm_tt_destroy(bo->ttm);
125 atomic_dec(&bo->glob->bo_count);
126 if (bo->destroy)
127 bo->destroy(bo);
128 else {
129 free(bo, M_TTM_BO);
130 }
131 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
132}
133
134int
135ttm_bo_wait_unreserved_locked(struct ttm_buffer_object *bo, bool interruptible)
136{
137 const char *wmsg;
138 int flags, ret;
139
140 ret = 0;
141 if (interruptible) {
142 flags = PCATCH;
143 wmsg = "ttbowi";
144 } else {
145 flags = 0;
146 wmsg = "ttbowu";
147 }
148 while (!ttm_bo_is_reserved(bo)) {
149 ret = -msleep(bo, &bo->glob->lru_lock, flags, wmsg, 0);
150 if (ret != 0)
151 break;
152 }
153 return (ret);
154}
155
156void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
157{
158 struct ttm_bo_device *bdev = bo->bdev;
159 struct ttm_mem_type_manager *man;
160
161 MPASS(ttm_bo_is_reserved(bo));
162
163 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
164
165 MPASS(list_empty(&bo->lru));
166
167 man = &bdev->man[bo->mem.mem_type];
168 list_add_tail(&bo->lru, &man->lru);
169 refcount_acquire(&bo->list_kref);
170
171 if (bo->ttm != NULL) {
172 list_add_tail(&bo->swap, &bo->glob->swap_lru);
173 refcount_acquire(&bo->list_kref);
174 }
175 }
176}
177
178int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
179{
180 int put_count = 0;
181
182 if (!list_empty(&bo->swap)) {
183 list_del_init(&bo->swap);
184 ++put_count;
185 }
186 if (!list_empty(&bo->lru)) {
187 list_del_init(&bo->lru);
188 ++put_count;
189 }
190
191 /*
192 * TODO: Add a driver hook to delete from
193 * driver-specific LRU's here.
194 */
195
196 return put_count;
197}
198
199int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
200 bool interruptible,
201 bool no_wait, bool use_sequence, uint32_t sequence)
202{
203 int ret;
204
205 while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
206 /**
207 * Deadlock avoidance for multi-bo reserving.
208 */
209 if (use_sequence && bo->seq_valid) {
210 /**
211 * We've already reserved this one.
212 */
213 if (unlikely(sequence == bo->val_seq))
214 return -EDEADLK;
215 /**
216 * Already reserved by a thread that will not back
217 * off for us. We need to back off.
218 */
219 if (unlikely(sequence - bo->val_seq < (1 << 31)))
220 return -EAGAIN;
221 }
222
223 if (no_wait)
224 return -EBUSY;
225
226 ret = ttm_bo_wait_unreserved_locked(bo, interruptible);
227
228 if (unlikely(ret))
229 return ret;
230 }
231
232 if (use_sequence) {
233 bool wake_up = false;
234 /**
235 * Wake up waiters that may need to recheck for deadlock,
236 * if we decreased the sequence number.
237 */
238 if (unlikely((bo->val_seq - sequence < (1 << 31))
239 || !bo->seq_valid))
240 wake_up = true;
241
242 /*
243 * In the worst case with memory ordering these values can be
244 * seen in the wrong order. However since we call wake_up_all
245 * in that case, this will hopefully not pose a problem,
246 * and the worst case would only cause someone to accidentally
247 * hit -EAGAIN in ttm_bo_reserve when they see old value of
248 * val_seq. However this would only happen if seq_valid was
249 * written before val_seq was, and just means some slightly
250 * increased cpu usage
251 */
252 bo->val_seq = sequence;
253 bo->seq_valid = true;
254 if (wake_up)
255 wakeup(bo);
256 } else {
257 bo->seq_valid = false;
258 }
259
260 return 0;
261}
262
263void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
264 bool never_free)
265{
266 u_int old;
267
268 old = atomic_fetchadd_int(&bo->list_kref, -count);
269 if (old <= count) {
270 if (never_free)
271 panic("ttm_bo_ref_buf");
272 ttm_bo_release_list(bo);
273 }
274}
275
276int 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 ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence,
285 sequence);
286 if (likely(ret == 0)) {
287 mtx_lock(&glob->lru_lock);
288 put_count = ttm_bo_del_from_lru(bo);
289 mtx_unlock(&glob->lru_lock);
290 ttm_bo_list_ref_sub(bo, put_count, true);
291 }
292
293 return ret;
294}
295
296int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
297 bool interruptible, uint32_t sequence)
298{
299 bool wake_up = false;
300 int ret;
301
302 while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
303 if (bo->seq_valid && sequence == bo->val_seq) {
304 DRM_ERROR(
305 "%s: bo->seq_valid && sequence == bo->val_seq",
306 __func__);
307 }
308
309 ret = ttm_bo_wait_unreserved_locked(bo, interruptible);
310
311 if (unlikely(ret))
312 return ret;
313 }
314
315 if ((bo->val_seq - sequence < (1 << 31)) || !bo->seq_valid)
316 wake_up = true;
317
318 /**
319 * Wake up waiters that may need to recheck for deadlock,
320 * if we decreased the sequence number.
321 */
322 bo->val_seq = sequence;
323 bo->seq_valid = true;
324 if (wake_up)
325 wakeup(bo);
326
327 return 0;
328}
329
330int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
331 bool interruptible, uint32_t sequence)
332{
333 struct ttm_bo_global *glob = bo->glob;
334 int put_count, ret;
335
336 ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence);
337 if (likely(!ret)) {
338 mtx_lock(&glob->lru_lock);
339 put_count = ttm_bo_del_from_lru(bo);
340 mtx_unlock(&glob->lru_lock);
341 ttm_bo_list_ref_sub(bo, put_count, true);
342 }
343 return ret;
344}
345
346void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
347{
348 ttm_bo_add_to_lru(bo);
349 atomic_set(&bo->reserved, 0);
350 wakeup(bo);
351}
352
353void ttm_bo_unreserve(struct ttm_buffer_object *bo)
354{
355 struct ttm_bo_global *glob = bo->glob;
356
357 mtx_lock(&glob->lru_lock);
358 ttm_bo_unreserve_locked(bo);
359 mtx_unlock(&glob->lru_lock);
360}
361
362/*
363 * Call bo->mutex locked.
364 */
365static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
366{
367 struct ttm_bo_device *bdev = bo->bdev;
368 struct ttm_bo_global *glob = bo->glob;
369 int ret = 0;
370 uint32_t page_flags = 0;
371
372 TTM_ASSERT_LOCKED(&bo->mutex);
373 bo->ttm = NULL;
374
375 if (bdev->need_dma32)
376 page_flags |= TTM_PAGE_FLAG_DMA32;
377
378 switch (bo->type) {
379 case ttm_bo_type_device:
380 if (zero_alloc)
381 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
382 case ttm_bo_type_kernel:
383 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
384 page_flags, glob->dummy_read_page);
385 if (unlikely(bo->ttm == NULL))
386 ret = -ENOMEM;
387 break;
388 case ttm_bo_type_sg:
389 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
390 page_flags | TTM_PAGE_FLAG_SG,
391 glob->dummy_read_page);
392 if (unlikely(bo->ttm == NULL)) {
393 ret = -ENOMEM;
394 break;
395 }
396 bo->ttm->sg = bo->sg;
397 break;
398 default:
399 printf("[TTM] Illegal buffer object type\n");
400 ret = -EINVAL;
401 break;
402 }
403
404 return ret;
405}
406
407static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
408 struct ttm_mem_reg *mem,
409 bool evict, bool interruptible,
410 bool no_wait_gpu)
411{
412 struct ttm_bo_device *bdev = bo->bdev;
413 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
414 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
415 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
416 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
417 int ret = 0;
418
419 if (old_is_pci || new_is_pci ||
420 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
421 ret = ttm_mem_io_lock(old_man, true);
422 if (unlikely(ret != 0))
423 goto out_err;
424 ttm_bo_unmap_virtual_locked(bo);
425 ttm_mem_io_unlock(old_man);
426 }
427
428 /*
429 * Create and bind a ttm if required.
430 */
431
432 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
433 if (bo->ttm == NULL) {
434 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
435 ret = ttm_bo_add_ttm(bo, zero);
436 if (ret)
437 goto out_err;
438 }
439
440 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
441 if (ret)
442 goto out_err;
443
444 if (mem->mem_type != TTM_PL_SYSTEM) {
445 ret = ttm_tt_bind(bo->ttm, mem);
446 if (ret)
447 goto out_err;
448 }
449
450 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
451 if (bdev->driver->move_notify)
452 bdev->driver->move_notify(bo, mem);
453 bo->mem = *mem;
454 mem->mm_node = NULL;
455 goto moved;
456 }
457 }
458
459 if (bdev->driver->move_notify)
460 bdev->driver->move_notify(bo, mem);
461
462 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
463 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
464 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
465 else if (bdev->driver->move)
466 ret = bdev->driver->move(bo, evict, interruptible,
467 no_wait_gpu, mem);
468 else
469 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
470
471 if (ret) {
472 if (bdev->driver->move_notify) {
473 struct ttm_mem_reg tmp_mem = *mem;
474 *mem = bo->mem;
475 bo->mem = tmp_mem;
476 bdev->driver->move_notify(bo, mem);
477 bo->mem = *mem;
478 }
479
480 goto out_err;
481 }
482
483moved:
484 if (bo->evicted) {
485 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
486 if (ret)
487 printf("[TTM] Can not flush read caches\n");
488 bo->evicted = false;
489 }
490
491 if (bo->mem.mm_node) {
492 bo->offset = (bo->mem.start << PAGE_SHIFT) +
493 bdev->man[bo->mem.mem_type].gpu_offset;
494 bo->cur_placement = bo->mem.placement;
495 } else
496 bo->offset = 0;
497
498 return 0;
499
500out_err:
501 new_man = &bdev->man[bo->mem.mem_type];
502 if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
503 ttm_tt_unbind(bo->ttm);
504 ttm_tt_destroy(bo->ttm);
505 bo->ttm = NULL;
506 }
507
508 return ret;
509}
510
511/**
512 * Call bo::reserved.
513 * Will release GPU memory type usage on destruction.
514 * This is the place to put in driver specific hooks to release
515 * driver private resources.
516 * Will release the bo::reserved lock.
517 */
518
519static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
520{
521 if (bo->bdev->driver->move_notify)
522 bo->bdev->driver->move_notify(bo, NULL);
523
524 if (bo->ttm) {
525 ttm_tt_unbind(bo->ttm);
526 ttm_tt_destroy(bo->ttm);
527 bo->ttm = NULL;
528 }
529 ttm_bo_mem_put(bo, &bo->mem);
530
531 atomic_set(&bo->reserved, 0);
532 wakeup(&bo);
533
534 /*
535 * Since the final reference to this bo may not be dropped by
536 * the current task we have to put a memory barrier here to make
537 * sure the changes done in this function are always visible.
538 *
539 * This function only needs protection against the final kref_put.
540 */
541 mb();
542}
543
544static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
545{
546 struct ttm_bo_device *bdev = bo->bdev;
547 struct ttm_bo_global *glob = bo->glob;
548 struct ttm_bo_driver *driver = bdev->driver;
549 void *sync_obj = NULL;
550 int put_count;
551 int ret;
552
553 mtx_lock(&glob->lru_lock);
554 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
555
556 mtx_lock(&bdev->fence_lock);
557 (void) ttm_bo_wait(bo, false, false, true);
558 if (!ret && !bo->sync_obj) {
559 mtx_unlock(&bdev->fence_lock);
560 put_count = ttm_bo_del_from_lru(bo);
561
562 mtx_unlock(&glob->lru_lock);
563 ttm_bo_cleanup_memtype_use(bo);
564
565 ttm_bo_list_ref_sub(bo, put_count, true);
566
567 return;
568 }
569 if (bo->sync_obj)
570 sync_obj = driver->sync_obj_ref(bo->sync_obj);
571 mtx_unlock(&bdev->fence_lock);
572
573 if (!ret) {
574 atomic_set(&bo->reserved, 0);
575 wakeup(bo);
576 }
577
578 refcount_acquire(&bo->list_kref);
579 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
580 mtx_unlock(&glob->lru_lock);
581
582 if (sync_obj) {
583 driver->sync_obj_flush(sync_obj);
584 driver->sync_obj_unref(&sync_obj);
585 }
586 taskqueue_enqueue_timeout(taskqueue_thread, &bdev->wq,
587 ((hz / 100) < 1) ? 1 : hz / 100);
588}
589
590/**
591 * function ttm_bo_cleanup_refs_and_unlock
592 * If bo idle, remove from delayed- and lru lists, and unref.
593 * If not idle, do nothing.
594 *
595 * Must be called with lru_lock and reservation held, this function
596 * will drop both before returning.
597 *
598 * @interruptible Any sleeps should occur interruptibly.
599 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
600 */
601
602static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
603 bool interruptible,
604 bool no_wait_gpu)
605{
606 struct ttm_bo_device *bdev = bo->bdev;
607 struct ttm_bo_driver *driver = bdev->driver;
608 struct ttm_bo_global *glob = bo->glob;
609 int put_count;
610 int ret;
611
612 mtx_lock(&bdev->fence_lock);
613 ret = ttm_bo_wait(bo, false, false, true);
614
615 if (ret && !no_wait_gpu) {
616 void *sync_obj;
617
618 /*
619 * Take a reference to the fence and unreserve,
620 * at this point the buffer should be dead, so
621 * no new sync objects can be attached.
622 */
623 sync_obj = driver->sync_obj_ref(bo->sync_obj);
624 mtx_unlock(&bdev->fence_lock);
625
626 atomic_set(&bo->reserved, 0);
627 wakeup(bo);
628 mtx_unlock(&glob->lru_lock);
629
630 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
631 driver->sync_obj_unref(&sync_obj);
632 if (ret)
633 return ret;
634
635 /*
636 * remove sync_obj with ttm_bo_wait, the wait should be
637 * finished, and no new wait object should have been added.
638 */
639 mtx_lock(&bdev->fence_lock);
640 ret = ttm_bo_wait(bo, false, false, true);
641 mtx_unlock(&bdev->fence_lock);
642 if (ret)
643 return ret;
644
645 mtx_lock(&glob->lru_lock);
646 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
647
648 /*
649 * We raced, and lost, someone else holds the reservation now,
650 * and is probably busy in ttm_bo_cleanup_memtype_use.
651 *
652 * Even if it's not the case, because we finished waiting any
653 * delayed destruction would succeed, so just return success
654 * here.
655 */
656 if (ret) {
657 mtx_unlock(&glob->lru_lock);
658 return 0;
659 }
660 } else
661 mtx_unlock(&bdev->fence_lock);
662
663 if (ret || unlikely(list_empty(&bo->ddestroy))) {
664 atomic_set(&bo->reserved, 0);
665 wakeup(bo);
666 mtx_unlock(&glob->lru_lock);
667 return ret;
668 }
669
670 put_count = ttm_bo_del_from_lru(bo);
671 list_del_init(&bo->ddestroy);
672 ++put_count;
673
674 mtx_unlock(&glob->lru_lock);
675 ttm_bo_cleanup_memtype_use(bo);
676
677 ttm_bo_list_ref_sub(bo, put_count, true);
678
679 return 0;
680}
681
682/**
683 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
684 * encountered buffers.
685 */
686
687static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
688{
689 struct ttm_bo_global *glob = bdev->glob;
690 struct ttm_buffer_object *entry = NULL;
691 int ret = 0;
692
693 mtx_lock(&glob->lru_lock);
694 if (list_empty(&bdev->ddestroy))
695 goto out_unlock;
696
697 entry = list_first_entry(&bdev->ddestroy,
698 struct ttm_buffer_object, ddestroy);
699 refcount_acquire(&entry->list_kref);
700
701 for (;;) {
702 struct ttm_buffer_object *nentry = NULL;
703
704 if (entry->ddestroy.next != &bdev->ddestroy) {
705 nentry = list_first_entry(&entry->ddestroy,
706 struct ttm_buffer_object, ddestroy);
707 refcount_acquire(&nentry->list_kref);
708 }
709
710 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
711 if (remove_all && ret) {
712 ret = ttm_bo_reserve_nolru(entry, false, false,
713 false, 0);
714 }
715
716 if (!ret)
717 ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
718 !remove_all);
719 else
720 mtx_unlock(&glob->lru_lock);
721
722 if (refcount_release(&entry->list_kref))
723 ttm_bo_release_list(entry);
724 entry = nentry;
725
726 if (ret || !entry)
727 goto out;
728
729 mtx_lock(&glob->lru_lock);
730 if (list_empty(&entry->ddestroy))
731 break;
732 }
733
734out_unlock:
735 mtx_unlock(&glob->lru_lock);
736out:
737 if (entry && refcount_release(&entry->list_kref))
738 ttm_bo_release_list(entry);
739 return ret;
740}
741
742static void ttm_bo_delayed_workqueue(void *arg, int pending __unused)
743{
744 struct ttm_bo_device *bdev = arg;
745
746 if (ttm_bo_delayed_delete(bdev, false)) {
747 taskqueue_enqueue_timeout(taskqueue_thread, &bdev->wq,
748 ((hz / 100) < 1) ? 1 : hz / 100);
749 }
750}
751
752static void ttm_bo_release(struct ttm_buffer_object *bo)
753{
754 struct ttm_bo_device *bdev = bo->bdev;
755 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
756
757 rw_wlock(&bdev->vm_lock);
758 if (likely(bo->vm_node != NULL)) {
759 RB_REMOVE(ttm_bo_device_buffer_objects,
760 &bdev->addr_space_rb, bo);
761 drm_mm_put_block(bo->vm_node);
762 bo->vm_node = NULL;
763 }
764 rw_wunlock(&bdev->vm_lock);
765 ttm_mem_io_lock(man, false);
766 ttm_mem_io_free_vm(bo);
767 ttm_mem_io_unlock(man);
768 ttm_bo_cleanup_refs_or_queue(bo);
769 if (refcount_release(&bo->list_kref))
770 ttm_bo_release_list(bo);
771}
772
773void ttm_bo_unref(struct ttm_buffer_object **p_bo)
774{
775 struct ttm_buffer_object *bo = *p_bo;
776
777 *p_bo = NULL;
778 if (refcount_release(&bo->kref))
779 ttm_bo_release(bo);
780}
781
782int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
783{
784 int pending;
785
786 taskqueue_cancel_timeout(taskqueue_thread, &bdev->wq, &pending);
787 if (pending)
788 taskqueue_drain_timeout(taskqueue_thread, &bdev->wq);
789 return (pending);
790}
791
792void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
793{
794 if (resched) {
795 taskqueue_enqueue_timeout(taskqueue_thread, &bdev->wq,
796 ((hz / 100) < 1) ? 1 : hz / 100);
797 }
798}
799
800static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
801 bool no_wait_gpu)
802{
803 struct ttm_bo_device *bdev = bo->bdev;
804 struct ttm_mem_reg evict_mem;
805 struct ttm_placement placement;
806 int ret = 0;
807
808 mtx_lock(&bdev->fence_lock);
809 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
810 mtx_unlock(&bdev->fence_lock);
811
812 if (unlikely(ret != 0)) {
813 if (ret != -ERESTART) {
814 printf("[TTM] Failed to expire sync object before buffer eviction\n");
815 }
816 goto out;
817 }
818
819 MPASS(ttm_bo_is_reserved(bo));
820
821 evict_mem = bo->mem;
822 evict_mem.mm_node = NULL;
823 evict_mem.bus.io_reserved_vm = false;
824 evict_mem.bus.io_reserved_count = 0;
825
826 placement.fpfn = 0;
827 placement.lpfn = 0;
828 placement.num_placement = 0;
829 placement.num_busy_placement = 0;
830 bdev->driver->evict_flags(bo, &placement);
831 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
832 no_wait_gpu);
833 if (ret) {
834 if (ret != -ERESTART) {
835 printf("[TTM] Failed to find memory space for buffer 0x%p eviction\n",
836 bo);
837 ttm_bo_mem_space_debug(bo, &placement);
838 }
839 goto out;
840 }
841
842 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
843 no_wait_gpu);
844 if (ret) {
845 if (ret != -ERESTART)
846 printf("[TTM] Buffer eviction failed\n");
847 ttm_bo_mem_put(bo, &evict_mem);
848 goto out;
849 }
850 bo->evicted = true;
851out:
852 return ret;
853}
854
855static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
856 uint32_t mem_type,
857 bool interruptible,
858 bool no_wait_gpu)
859{
860 struct ttm_bo_global *glob = bdev->glob;
861 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
862 struct ttm_buffer_object *bo;
863 int ret = -EBUSY, put_count;
864
865 mtx_lock(&glob->lru_lock);
866 list_for_each_entry(bo, &man->lru, lru) {
867 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
868 if (!ret)
869 break;
870 }
871
872 if (ret) {
873 mtx_unlock(&glob->lru_lock);
874 return ret;
875 }
876
877 refcount_acquire(&bo->list_kref);
878
879 if (!list_empty(&bo->ddestroy)) {
880 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
881 no_wait_gpu);
882 if (refcount_release(&bo->list_kref))
883 ttm_bo_release_list(bo);
884 return ret;
885 }
886
887 put_count = ttm_bo_del_from_lru(bo);
888 mtx_unlock(&glob->lru_lock);
889
890 MPASS(ret == 0);
891
892 ttm_bo_list_ref_sub(bo, put_count, true);
893
894 ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
895 ttm_bo_unreserve(bo);
896
897 if (refcount_release(&bo->list_kref))
898 ttm_bo_release_list(bo);
899 return ret;
900}
901
902void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
903{
904 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
905
906 if (mem->mm_node)
907 (*man->func->put_node)(man, mem);
908}
909
910/**
911 * Repeatedly evict memory from the LRU for @mem_type until we create enough
912 * space, or we've evicted everything and there isn't enough space.
913 */
914static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
915 uint32_t mem_type,
916 struct ttm_placement *placement,
917 struct ttm_mem_reg *mem,
918 bool interruptible,
919 bool no_wait_gpu)
920{
921 struct ttm_bo_device *bdev = bo->bdev;
922 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
923 int ret;
924
925 do {
926 ret = (*man->func->get_node)(man, bo, placement, mem);
927 if (unlikely(ret != 0))
928 return ret;
929 if (mem->mm_node)
930 break;
931 ret = ttm_mem_evict_first(bdev, mem_type,
932 interruptible, no_wait_gpu);
933 if (unlikely(ret != 0))
934 return ret;
935 } while (1);
936 if (mem->mm_node == NULL)
937 return -ENOMEM;
938 mem->mem_type = mem_type;
939 return 0;
940}
941
942static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
943 uint32_t cur_placement,
944 uint32_t proposed_placement)
945{
946 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
947 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
948
949 /**
950 * Keep current caching if possible.
951 */
952
953 if ((cur_placement & caching) != 0)
954 result |= (cur_placement & caching);
955 else if ((man->default_caching & caching) != 0)
956 result |= man->default_caching;
957 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
958 result |= TTM_PL_FLAG_CACHED;
959 else if ((TTM_PL_FLAG_WC & caching) != 0)
960 result |= TTM_PL_FLAG_WC;
961 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
962 result |= TTM_PL_FLAG_UNCACHED;
963
964 return result;
965}
966
967static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
968 uint32_t mem_type,
969 uint32_t proposed_placement,
970 uint32_t *masked_placement)
971{
972 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
973
974 if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
975 return false;
976
977 if ((proposed_placement & man->available_caching) == 0)
978 return false;
979
980 cur_flags |= (proposed_placement & man->available_caching);
981
982 *masked_placement = cur_flags;
983 return true;
984}
985
986/**
987 * Creates space for memory region @mem according to its type.
988 *
989 * This function first searches for free space in compatible memory types in
990 * the priority order defined by the driver. If free space isn't found, then
991 * ttm_bo_mem_force_space is attempted in priority order to evict and find
992 * space.
993 */
994int ttm_bo_mem_space(struct ttm_buffer_object *bo,
995 struct ttm_placement *placement,
996 struct ttm_mem_reg *mem,
997 bool interruptible,
998 bool no_wait_gpu)
999{
1000 struct ttm_bo_device *bdev = bo->bdev;
1001 struct ttm_mem_type_manager *man;
1002 uint32_t mem_type = TTM_PL_SYSTEM;
1003 uint32_t cur_flags = 0;
1004 bool type_found = false;
1005 bool type_ok = false;
1006 bool has_erestartsys = false;
1007 int i, ret;
1008
1009 mem->mm_node = NULL;
1010 for (i = 0; i < placement->num_placement; ++i) {
1011 ret = ttm_mem_type_from_flags(placement->placement[i],
1012 &mem_type);
1013 if (ret)
1014 return ret;
1015 man = &bdev->man[mem_type];
1016
1017 type_ok = ttm_bo_mt_compatible(man,
1018 mem_type,
1019 placement->placement[i],
1020 &cur_flags);
1021
1022 if (!type_ok)
1023 continue;
1024
1025 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1026 cur_flags);
1027 /*
1028 * Use the access and other non-mapping-related flag bits from
1029 * the memory placement flags to the current flags
1030 */
1031 ttm_flag_masked(&cur_flags, placement->placement[i],
1032 ~TTM_PL_MASK_MEMTYPE);
1033
1034 if (mem_type == TTM_PL_SYSTEM)
1035 break;
1036
1037 if (man->has_type && man->use_type) {
1038 type_found = true;
1039 ret = (*man->func->get_node)(man, bo, placement, mem);
1040 if (unlikely(ret))
1041 return ret;
1042 }
1043 if (mem->mm_node)
1044 break;
1045 }
1046
1047 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1048 mem->mem_type = mem_type;
1049 mem->placement = cur_flags;
1050 return 0;
1051 }
1052
1053 if (!type_found)
1054 return -EINVAL;
1055
1056 for (i = 0; i < placement->num_busy_placement; ++i) {
1057 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1058 &mem_type);
1059 if (ret)
1060 return ret;
1061 man = &bdev->man[mem_type];
1062 if (!man->has_type)
1063 continue;
1064 if (!ttm_bo_mt_compatible(man,
1065 mem_type,
1066 placement->busy_placement[i],
1067 &cur_flags))
1068 continue;
1069
1070 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1071 cur_flags);
1072 /*
1073 * Use the access and other non-mapping-related flag bits from
1074 * the memory placement flags to the current flags
1075 */
1076 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1077 ~TTM_PL_MASK_MEMTYPE);
1078
1079
1080 if (mem_type == TTM_PL_SYSTEM) {
1081 mem->mem_type = mem_type;
1082 mem->placement = cur_flags;
1083 mem->mm_node = NULL;
1084 return 0;
1085 }
1086
1087 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1088 interruptible, no_wait_gpu);
1089 if (ret == 0 && mem->mm_node) {
1090 mem->placement = cur_flags;
1091 return 0;
1092 }
1093 if (ret == -ERESTART)
1094 has_erestartsys = true;
1095 }
1096 ret = (has_erestartsys) ? -ERESTART : -ENOMEM;
1097 return ret;
1098}
1099
1100static
1101int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1102 struct ttm_placement *placement,
1103 bool interruptible,
1104 bool no_wait_gpu)
1105{
1106 int ret = 0;
1107 struct ttm_mem_reg mem;
1108 struct ttm_bo_device *bdev = bo->bdev;
1109
1110 MPASS(ttm_bo_is_reserved(bo));
1111
1112 /*
1113 * FIXME: It's possible to pipeline buffer moves.
1114 * Have the driver move function wait for idle when necessary,
1115 * instead of doing it here.
1116 */
1117 mtx_lock(&bdev->fence_lock);
1118 ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1119 mtx_unlock(&bdev->fence_lock);
1120 if (ret)
1121 return ret;
1122 mem.num_pages = bo->num_pages;
1123 mem.size = mem.num_pages << PAGE_SHIFT;
1124 mem.page_alignment = bo->mem.page_alignment;
1125 mem.bus.io_reserved_vm = false;
1126 mem.bus.io_reserved_count = 0;
1127 /*
1128 * Determine where to move the buffer.
1129 */
1130 ret = ttm_bo_mem_space(bo, placement, &mem,
1131 interruptible, no_wait_gpu);
1132 if (ret)
1133 goto out_unlock;
1134 ret = ttm_bo_handle_move_mem(bo, &mem, false,
1135 interruptible, no_wait_gpu);
1136out_unlock:
1137 if (ret && mem.mm_node)
1138 ttm_bo_mem_put(bo, &mem);
1139 return ret;
1140}
1141
1142static int ttm_bo_mem_compat(struct ttm_placement *placement,
1143 struct ttm_mem_reg *mem)
1144{
1145 int i;
1146
1147 if (mem->mm_node && placement->lpfn != 0 &&
1148 (mem->start < placement->fpfn ||
1149 mem->start + mem->num_pages > placement->lpfn))
1150 return -1;
1151
1152 for (i = 0; i < placement->num_placement; i++) {
1153 if ((placement->placement[i] & mem->placement &
1154 TTM_PL_MASK_CACHING) &&
1155 (placement->placement[i] & mem->placement &
1156 TTM_PL_MASK_MEM))
1157 return i;
1158 }
1159 return -1;
1160}
1161
1162int ttm_bo_validate(struct ttm_buffer_object *bo,
1163 struct ttm_placement *placement,
1164 bool interruptible,
1165 bool no_wait_gpu)
1166{
1167 int ret;
1168
1169 MPASS(ttm_bo_is_reserved(bo));
1170 /* Check that range is valid */
1171 if (placement->lpfn || placement->fpfn)
1172 if (placement->fpfn > placement->lpfn ||
1173 (placement->lpfn - placement->fpfn) < bo->num_pages)
1174 return -EINVAL;
1175 /*
1176 * Check whether we need to move buffer.
1177 */
1178 ret = ttm_bo_mem_compat(placement, &bo->mem);
1179 if (ret < 0) {
1180 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1181 no_wait_gpu);
1182 if (ret)
1183 return ret;
1184 } else {
1185 /*
1186 * Use the access and other non-mapping-related flag bits from
1187 * the compatible memory placement flags to the active flags
1188 */
1189 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1190 ~TTM_PL_MASK_MEMTYPE);
1191 }
1192 /*
1193 * We might need to add a TTM.
1194 */
1195 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1196 ret = ttm_bo_add_ttm(bo, true);
1197 if (ret)
1198 return ret;
1199 }
1200 return 0;
1201}
1202
1203int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1204 struct ttm_placement *placement)
1205{
1206 MPASS(!((placement->fpfn || placement->lpfn) &&
1207 (bo->mem.num_pages > (placement->lpfn - placement->fpfn))));
1208
1209 return 0;
1210}
1211
1212int ttm_bo_init(struct ttm_bo_device *bdev,
1213 struct ttm_buffer_object *bo,
1214 unsigned long size,
1215 enum ttm_bo_type type,
1216 struct ttm_placement *placement,
1217 uint32_t page_alignment,
1218 bool interruptible,
1219 struct vm_object *persistent_swap_storage,
1220 size_t acc_size,
1221 struct sg_table *sg,
1222 void (*destroy) (struct ttm_buffer_object *))
1223{
1224 int ret = 0;
1225 unsigned long num_pages;
1226 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1227
1228 ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1229 if (ret) {
1230 printf("[TTM] Out of kernel memory\n");
1231 if (destroy)
1232 (*destroy)(bo);
1233 else
1234 free(bo, M_TTM_BO);
1235 return -ENOMEM;
1236 }
1237
1238 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1239 if (num_pages == 0) {
1240 printf("[TTM] Illegal buffer object size\n");
1241 if (destroy)
1242 (*destroy)(bo);
1243 else
1244 free(bo, M_TTM_BO);
1245 ttm_mem_global_free(mem_glob, acc_size);
1246 return -EINVAL;
1247 }
1248 bo->destroy = destroy;
1249
1250 refcount_init(&bo->kref, 1);
1251 refcount_init(&bo->list_kref, 1);
1252 atomic_set(&bo->cpu_writers, 0);
1253 atomic_set(&bo->reserved, 1);
1254 INIT_LIST_HEAD(&bo->lru);
1255 INIT_LIST_HEAD(&bo->ddestroy);
1256 INIT_LIST_HEAD(&bo->swap);
1257 INIT_LIST_HEAD(&bo->io_reserve_lru);
1258 bo->bdev = bdev;
1259 bo->glob = bdev->glob;
1260 bo->type = type;
1261 bo->num_pages = num_pages;
1262 bo->mem.size = num_pages << PAGE_SHIFT;
1263 bo->mem.mem_type = TTM_PL_SYSTEM;
1264 bo->mem.num_pages = bo->num_pages;
1265 bo->mem.mm_node = NULL;
1266 bo->mem.page_alignment = page_alignment;
1267 bo->mem.bus.io_reserved_vm = false;
1268 bo->mem.bus.io_reserved_count = 0;
1269 bo->priv_flags = 0;
1270 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1271 bo->seq_valid = false;
1272 bo->persistent_swap_storage = persistent_swap_storage;
1273 bo->acc_size = acc_size;
1274 bo->sg = sg;
1275 atomic_inc(&bo->glob->bo_count);
1276
1277 ret = ttm_bo_check_placement(bo, placement);
1278 if (unlikely(ret != 0))
1279 goto out_err;
1280
1281 /*
1282 * For ttm_bo_type_device buffers, allocate
1283 * address space from the device.
1284 */
1285 if (bo->type == ttm_bo_type_device ||
1286 bo->type == ttm_bo_type_sg) {
1287 ret = ttm_bo_setup_vm(bo);
1288 if (ret)
1289 goto out_err;
1290 }
1291
1292 ret = ttm_bo_validate(bo, placement, interruptible, false);
1293 if (ret)
1294 goto out_err;
1295
1296 ttm_bo_unreserve(bo);
1297 return 0;
1298
1299out_err:
1300 ttm_bo_unreserve(bo);
1301 ttm_bo_unref(&bo);
1302
1303 return ret;
1304}
1305
1306size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1307 unsigned long bo_size,
1308 unsigned struct_size)
1309{
1310 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1311 size_t size = 0;
1312
1313 size += ttm_round_pot(struct_size);
1314 size += PAGE_ALIGN(npages * sizeof(void *));
1315 size += ttm_round_pot(sizeof(struct ttm_tt));
1316 return size;
1317}
1318
1319size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1320 unsigned long bo_size,
1321 unsigned struct_size)
1322{
1323 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1324 size_t size = 0;
1325
1326 size += ttm_round_pot(struct_size);
1327 size += PAGE_ALIGN(npages * sizeof(void *));
1328 size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1329 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1330 return size;
1331}
1332
1333int ttm_bo_create(struct ttm_bo_device *bdev,
1334 unsigned long size,
1335 enum ttm_bo_type type,
1336 struct ttm_placement *placement,
1337 uint32_t page_alignment,
1338 bool interruptible,
1339 struct vm_object *persistent_swap_storage,
1340 struct ttm_buffer_object **p_bo)
1341{
1342 struct ttm_buffer_object *bo;
1343 size_t acc_size;
1344 int ret;
1345
1346 bo = malloc(sizeof(*bo), M_TTM_BO, M_WAITOK | M_ZERO);
1347 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1348 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1349 interruptible, persistent_swap_storage, acc_size,
1350 NULL, NULL);
1351 if (likely(ret == 0))
1352 *p_bo = bo;
1353
1354 return ret;
1355}
1356
1357static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1358 unsigned mem_type, bool allow_errors)
1359{
1360 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1361 struct ttm_bo_global *glob = bdev->glob;
1362 int ret;
1363
1364 /*
1365 * Can't use standard list traversal since we're unlocking.
1366 */
1367
1368 mtx_lock(&glob->lru_lock);
1369 while (!list_empty(&man->lru)) {
1370 mtx_unlock(&glob->lru_lock);
1371 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1372 if (ret) {
1373 if (allow_errors) {
1374 return ret;
1375 } else {
1376 printf("[TTM] Cleanup eviction failed\n");
1377 }
1378 }
1379 mtx_lock(&glob->lru_lock);
1380 }
1381 mtx_unlock(&glob->lru_lock);
1382 return 0;
1383}
1384
1385int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1386{
1387 struct ttm_mem_type_manager *man;
1388 int ret = -EINVAL;
1389
1390 if (mem_type >= TTM_NUM_MEM_TYPES) {
1391 printf("[TTM] Illegal memory type %d\n", mem_type);
1392 return ret;
1393 }
1394 man = &bdev->man[mem_type];
1395
1396 if (!man->has_type) {
1397 printf("[TTM] Trying to take down uninitialized memory manager type %u\n",
1398 mem_type);
1399 return ret;
1400 }
1401
1402 man->use_type = false;
1403 man->has_type = false;
1404
1405 ret = 0;
1406 if (mem_type > 0) {
1407 ttm_bo_force_list_clean(bdev, mem_type, false);
1408
1409 ret = (*man->func->takedown)(man);
1410 }
1411
1412 return ret;
1413}
1414
1415int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1416{
1417 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1418
1419 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1420 printf("[TTM] Illegal memory manager memory type %u\n", mem_type);
1421 return -EINVAL;
1422 }
1423
1424 if (!man->has_type) {
1425 printf("[TTM] Memory type %u has not been initialized\n", mem_type);
1426 return 0;
1427 }
1428
1429 return ttm_bo_force_list_clean(bdev, mem_type, true);
1430}
1431
1432int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1433 unsigned long p_size)
1434{
1435 int ret = -EINVAL;
1436 struct ttm_mem_type_manager *man;
1437
1438 MPASS(type < TTM_NUM_MEM_TYPES);
1439 man = &bdev->man[type];
1440 MPASS(!man->has_type);
1441 man->io_reserve_fastpath = true;
1442 man->use_io_reserve_lru = false;
1443 sx_init(&man->io_reserve_mutex, "ttmman");
1444 INIT_LIST_HEAD(&man->io_reserve_lru);
1445
1446 ret = bdev->driver->init_mem_type(bdev, type, man);
1447 if (ret)
1448 return ret;
1449 man->bdev = bdev;
1450
1451 ret = 0;
1452 if (type != TTM_PL_SYSTEM) {
1453 ret = (*man->func->init)(man, p_size);
1454 if (ret)
1455 return ret;
1456 }
1457 man->has_type = true;
1458 man->use_type = true;
1459 man->size = p_size;
1460
1461 INIT_LIST_HEAD(&man->lru);
1462
1463 return 0;
1464}
1465
1466static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1467{
1468
1469 ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1470 vm_page_free(glob->dummy_read_page);
1471}
1472
1473void ttm_bo_global_release(struct drm_global_reference *ref)
1474{
1475 struct ttm_bo_global *glob = ref->object;
1476
1477 if (refcount_release(&glob->kobj_ref))
1478 ttm_bo_global_kobj_release(glob);
1479}
1480
1481int ttm_bo_global_init(struct drm_global_reference *ref)
1482{
1483 struct ttm_bo_global_ref *bo_ref =
1484 container_of(ref, struct ttm_bo_global_ref, ref);
1485 struct ttm_bo_global *glob = ref->object;
1486 int ret;
1487
1488 sx_init(&glob->device_list_mutex, "ttmdlm");
1489 mtx_init(&glob->lru_lock, "ttmlru", NULL, MTX_DEF);
1490 glob->mem_glob = bo_ref->mem_glob;
1491 glob->dummy_read_page = vm_page_alloc_contig(NULL, 0,
1492 VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ,
1493 1, 0, VM_MAX_ADDRESS, PAGE_SIZE, 0, VM_MEMATTR_UNCACHEABLE);
1494
1495 if (unlikely(glob->dummy_read_page == NULL)) {
1496 ret = -ENOMEM;
1497 goto out_no_drp;
1498 }
1499
1500 INIT_LIST_HEAD(&glob->swap_lru);
1501 INIT_LIST_HEAD(&glob->device_list);
1502
1503 ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1504 ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1505 if (unlikely(ret != 0)) {
1506 printf("[TTM] Could not register buffer object swapout\n");
1507 goto out_no_shrink;
1508 }
1509
1510 atomic_set(&glob->bo_count, 0);
1511
1512 refcount_init(&glob->kobj_ref, 1);
1513 return (0);
1514
1515out_no_shrink:
1516 vm_page_free(glob->dummy_read_page);
1517out_no_drp:
1518 free(glob, M_DRM_GLOBAL);
1519 return ret;
1520}
1521
1522int ttm_bo_device_release(struct ttm_bo_device *bdev)
1523{
1524 int ret = 0;
1525 unsigned i = TTM_NUM_MEM_TYPES;
1526 struct ttm_mem_type_manager *man;
1527 struct ttm_bo_global *glob = bdev->glob;
1528
1529 while (i--) {
1530 man = &bdev->man[i];
1531 if (man->has_type) {
1532 man->use_type = false;
1533 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1534 ret = -EBUSY;
1535 printf("[TTM] DRM memory manager type %d is not clean\n",
1536 i);
1537 }
1538 man->has_type = false;
1539 }
1540 }
1541
1542 sx_xlock(&glob->device_list_mutex);
1543 list_del(&bdev->device_list);
1544 sx_xunlock(&glob->device_list_mutex);
1545
1546 if (taskqueue_cancel_timeout(taskqueue_thread, &bdev->wq, NULL))
1547 taskqueue_drain_timeout(taskqueue_thread, &bdev->wq);
1548
1549 while (ttm_bo_delayed_delete(bdev, true))
1550 ;
1551
1552 mtx_lock(&glob->lru_lock);
1553 if (list_empty(&bdev->ddestroy))
1554 TTM_DEBUG("Delayed destroy list was clean\n");
1555
1556 if (list_empty(&bdev->man[0].lru))
1557 TTM_DEBUG("Swap list was clean\n");
1558 mtx_unlock(&glob->lru_lock);
1559
1560 MPASS(drm_mm_clean(&bdev->addr_space_mm));
1561 rw_wlock(&bdev->vm_lock);
1562 drm_mm_takedown(&bdev->addr_space_mm);
1563 rw_wunlock(&bdev->vm_lock);
1564
1565 return ret;
1566}
1567
1568int ttm_bo_device_init(struct ttm_bo_device *bdev,
1569 struct ttm_bo_global *glob,
1570 struct ttm_bo_driver *driver,
1571 uint64_t file_page_offset,
1572 bool need_dma32)
1573{
1574 int ret = -EINVAL;
1575
1576 rw_init(&bdev->vm_lock, "ttmvml");
1577 bdev->driver = driver;
1578
1579 memset(bdev->man, 0, sizeof(bdev->man));
1580
1581 /*
1582 * Initialize the system memory buffer type.
1583 * Other types need to be driver / IOCTL initialized.
1584 */
1585 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1586 if (unlikely(ret != 0))
1587 goto out_no_sys;
1588
1589 RB_INIT(&bdev->addr_space_rb);
1590 ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1591 if (unlikely(ret != 0))
1592 goto out_no_addr_mm;
1593
1594 TIMEOUT_TASK_INIT(taskqueue_thread, &bdev->wq, 0,
1595 ttm_bo_delayed_workqueue, bdev);
1596 INIT_LIST_HEAD(&bdev->ddestroy);
1597 bdev->dev_mapping = NULL;
1598 bdev->glob = glob;
1599 bdev->need_dma32 = need_dma32;
1600 bdev->val_seq = 0;
1601 mtx_init(&bdev->fence_lock, "ttmfence", NULL, MTX_DEF);
1602 sx_xlock(&glob->device_list_mutex);
1603 list_add_tail(&bdev->device_list, &glob->device_list);
1604 sx_xunlock(&glob->device_list_mutex);
1605
1606 return 0;
1607out_no_addr_mm:
1608 ttm_bo_clean_mm(bdev, 0);
1609out_no_sys:
1610 return ret;
1611}
1612
1613/*
1614 * buffer object vm functions.
1615 */
1616
1617bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1618{
1619 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1620
1621 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1622 if (mem->mem_type == TTM_PL_SYSTEM)
1623 return false;
1624
1625 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1626 return false;
1627
1628 if (mem->placement & TTM_PL_FLAG_CACHED)
1629 return false;
1630 }
1631 return true;
1632}
1633
1634void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1635{
1636 struct ttm_bo_device *bdev = bo->bdev;
1637 /* off_t offset = (off_t)bo->addr_space_offset;XXXKIB */
1638 /* off_t holelen = ((off_t)bo->mem.num_pages) << PAGE_SHIFT;XXXKIB */
1639
1640 if (!bdev->dev_mapping)
1641 return;
1642 /* unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1); XXXKIB */
1643 ttm_mem_io_free_vm(bo);
1644}
1645
1646void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1647{
1648 struct ttm_bo_device *bdev = bo->bdev;
1649 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1650
1651 ttm_mem_io_lock(man, false);
1652 ttm_bo_unmap_virtual_locked(bo);
1653 ttm_mem_io_unlock(man);
1654}
1655
1656static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1657{
1658 struct ttm_bo_device *bdev = bo->bdev;
1659
1660 /* The caller acquired bdev->vm_lock. */
1661 RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1662}
1663
1664/**
1665 * ttm_bo_setup_vm:
1666 *
1667 * @bo: the buffer to allocate address space for
1668 *
1669 * Allocate address space in the drm device so that applications
1670 * can mmap the buffer and access the contents. This only
1671 * applies to ttm_bo_type_device objects as others are not
1672 * placed in the drm device address space.
1673 */
1674
1675static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1676{
1677 struct ttm_bo_device *bdev = bo->bdev;
1678 int ret;
1679
1680retry_pre_get:
1681 ret = drm_mm_pre_get(&bdev->addr_space_mm);
1682 if (unlikely(ret != 0))
1683 return ret;
1684
1685 rw_wlock(&bdev->vm_lock);
1686 bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1687 bo->mem.num_pages, 0, 0);
1688
1689 if (unlikely(bo->vm_node == NULL)) {
1690 ret = -ENOMEM;
1691 goto out_unlock;
1692 }
1693
1694 bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1695 bo->mem.num_pages, 0);
1696
1697 if (unlikely(bo->vm_node == NULL)) {
1698 rw_wunlock(&bdev->vm_lock);
1699 goto retry_pre_get;
1700 }
1701
1702 ttm_bo_vm_insert_rb(bo);
1703 rw_wunlock(&bdev->vm_lock);
1704 bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1705
1706 return 0;
1707out_unlock:
1708 rw_wunlock(&bdev->vm_lock);
1709 return ret;
1710}
1711
1712int ttm_bo_wait(struct ttm_buffer_object *bo,
1713 bool lazy, bool interruptible, bool no_wait)
1714{
1715 struct ttm_bo_driver *driver = bo->bdev->driver;
1716 struct ttm_bo_device *bdev = bo->bdev;
1717 void *sync_obj;
1718 int ret = 0;
1719
1720 if (likely(bo->sync_obj == NULL))
1721 return 0;
1722
1723 while (bo->sync_obj) {
1724
1725 if (driver->sync_obj_signaled(bo->sync_obj)) {
1726 void *tmp_obj = bo->sync_obj;
1727 bo->sync_obj = NULL;
1728 clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1729 mtx_unlock(&bdev->fence_lock);
1730 driver->sync_obj_unref(&tmp_obj);
1731 mtx_lock(&bdev->fence_lock);
1732 continue;
1733 }
1734
1735 if (no_wait)
1736 return -EBUSY;
1737
1738 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1739 mtx_unlock(&bdev->fence_lock);
1740 ret = driver->sync_obj_wait(sync_obj,
1741 lazy, interruptible);
1742 if (unlikely(ret != 0)) {
1743 driver->sync_obj_unref(&sync_obj);
1744 mtx_lock(&bdev->fence_lock);
1745 return ret;
1746 }
1747 mtx_lock(&bdev->fence_lock);
1748 if (likely(bo->sync_obj == sync_obj)) {
1749 void *tmp_obj = bo->sync_obj;
1750 bo->sync_obj = NULL;
1751 clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1752 &bo->priv_flags);
1753 mtx_unlock(&bdev->fence_lock);
1754 driver->sync_obj_unref(&sync_obj);
1755 driver->sync_obj_unref(&tmp_obj);
1756 mtx_lock(&bdev->fence_lock);
1757 } else {
1758 mtx_unlock(&bdev->fence_lock);
1759 driver->sync_obj_unref(&sync_obj);
1760 mtx_lock(&bdev->fence_lock);
1761 }
1762 }
1763 return 0;
1764}
1765
1766int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1767{
1768 struct ttm_bo_device *bdev = bo->bdev;
1769 int ret = 0;
1770
1771 /*
1772 * Using ttm_bo_reserve makes sure the lru lists are updated.
1773 */
1774
1775 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1776 if (unlikely(ret != 0))
1777 return ret;
1778 mtx_lock(&bdev->fence_lock);
1779 ret = ttm_bo_wait(bo, false, true, no_wait);
1780 mtx_unlock(&bdev->fence_lock);
1781 if (likely(ret == 0))
1782 atomic_inc(&bo->cpu_writers);
1783 ttm_bo_unreserve(bo);
1784 return ret;
1785}
1786
1787void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1788{
1789 atomic_dec(&bo->cpu_writers);
1790}
1791
1792/**
1793 * A buffer object shrink method that tries to swap out the first
1794 * buffer object on the bo_global::swap_lru list.
1795 */
1796
1797static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1798{
1799 struct ttm_bo_global *glob =
1800 container_of(shrink, struct ttm_bo_global, shrink);
1801 struct ttm_buffer_object *bo;
1802 int ret = -EBUSY;
1803 int put_count;
1804 uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1805
1806 mtx_lock(&glob->lru_lock);
1807 list_for_each_entry(bo, &glob->swap_lru, swap) {
1808 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1809 if (!ret)
1810 break;
1811 }
1812
1813 if (ret) {
1814 mtx_unlock(&glob->lru_lock);
1815 return ret;
1816 }
1817
1818 refcount_acquire(&bo->list_kref);
1819
1820 if (!list_empty(&bo->ddestroy)) {
1821 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1822 if (refcount_release(&bo->list_kref))
1823 ttm_bo_release_list(bo);
1824 return ret;
1825 }
1826
1827 put_count = ttm_bo_del_from_lru(bo);
1828 mtx_unlock(&glob->lru_lock);
1829
1830 ttm_bo_list_ref_sub(bo, put_count, true);
1831
1832 /**
1833 * Wait for GPU, then move to system cached.
1834 */
1835
1836 mtx_lock(&bo->bdev->fence_lock);
1837 ret = ttm_bo_wait(bo, false, false, false);
1838 mtx_unlock(&bo->bdev->fence_lock);
1839
1840 if (unlikely(ret != 0))
1841 goto out;
1842
1843 if ((bo->mem.placement & swap_placement) != swap_placement) {
1844 struct ttm_mem_reg evict_mem;
1845
1846 evict_mem = bo->mem;
1847 evict_mem.mm_node = NULL;
1848 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1849 evict_mem.mem_type = TTM_PL_SYSTEM;
1850
1851 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1852 false, false);
1853 if (unlikely(ret != 0))
1854 goto out;
1855 }
1856
1857 ttm_bo_unmap_virtual(bo);
1858
1859 /**
1860 * Swap out. Buffer will be swapped in again as soon as
1861 * anyone tries to access a ttm page.
1862 */
1863
1864 if (bo->bdev->driver->swap_notify)
1865 bo->bdev->driver->swap_notify(bo);
1866
1867 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1868out:
1869
1870 /**
1871 *
1872 * Unreserve without putting on LRU to avoid swapping out an
1873 * already swapped buffer.
1874 */
1875
1876 atomic_set(&bo->reserved, 0);
1877 wakeup(bo);
1878 if (refcount_release(&bo->list_kref))
1879 ttm_bo_release_list(bo);
1880 return ret;
1881}
1882
1883void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1884{
1885 while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1886 ;
1887}