bpf: Prevent memory disambiguation attack
[linux/fpc-iii.git] / drivers / gpu / drm / ttm / ttm_bo.c
blob2fef09a56d16b62d472b4577fe746a0dff4a2928
1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
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14 * The above copyright notice and this permission notice (including the
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16 * of the Software.
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26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 #define pr_fmt(fmt) "[TTM] " fmt
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/jiffies.h>
37 #include <linux/slab.h>
38 #include <linux/sched.h>
39 #include <linux/mm.h>
40 #include <linux/file.h>
41 #include <linux/module.h>
42 #include <linux/atomic.h>
43 #include <linux/reservation.h>
45 static void ttm_bo_global_kobj_release(struct kobject *kobj);
47 static struct attribute ttm_bo_count = {
48 .name = "bo_count",
49 .mode = S_IRUGO
52 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
53 uint32_t *mem_type)
55 int pos;
57 pos = ffs(place->flags & TTM_PL_MASK_MEM);
58 if (unlikely(!pos))
59 return -EINVAL;
61 *mem_type = pos - 1;
62 return 0;
65 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
67 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
68 struct drm_printer p = drm_debug_printer(TTM_PFX);
70 pr_err(" has_type: %d\n", man->has_type);
71 pr_err(" use_type: %d\n", man->use_type);
72 pr_err(" flags: 0x%08X\n", man->flags);
73 pr_err(" gpu_offset: 0x%08llX\n", man->gpu_offset);
74 pr_err(" size: %llu\n", man->size);
75 pr_err(" available_caching: 0x%08X\n", man->available_caching);
76 pr_err(" default_caching: 0x%08X\n", man->default_caching);
77 if (mem_type != TTM_PL_SYSTEM)
78 (*man->func->debug)(man, &p);
81 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
82 struct ttm_placement *placement)
84 int i, ret, mem_type;
86 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
87 bo, bo->mem.num_pages, bo->mem.size >> 10,
88 bo->mem.size >> 20);
89 for (i = 0; i < placement->num_placement; i++) {
90 ret = ttm_mem_type_from_place(&placement->placement[i],
91 &mem_type);
92 if (ret)
93 return;
94 pr_err(" placement[%d]=0x%08X (%d)\n",
95 i, placement->placement[i].flags, mem_type);
96 ttm_mem_type_debug(bo->bdev, mem_type);
100 static ssize_t ttm_bo_global_show(struct kobject *kobj,
101 struct attribute *attr,
102 char *buffer)
104 struct ttm_bo_global *glob =
105 container_of(kobj, struct ttm_bo_global, kobj);
107 return snprintf(buffer, PAGE_SIZE, "%d\n",
108 atomic_read(&glob->bo_count));
111 static struct attribute *ttm_bo_global_attrs[] = {
112 &ttm_bo_count,
113 NULL
116 static const struct sysfs_ops ttm_bo_global_ops = {
117 .show = &ttm_bo_global_show
120 static struct kobj_type ttm_bo_glob_kobj_type = {
121 .release = &ttm_bo_global_kobj_release,
122 .sysfs_ops = &ttm_bo_global_ops,
123 .default_attrs = ttm_bo_global_attrs
127 static inline uint32_t ttm_bo_type_flags(unsigned type)
129 return 1 << (type);
132 static void ttm_bo_release_list(struct kref *list_kref)
134 struct ttm_buffer_object *bo =
135 container_of(list_kref, struct ttm_buffer_object, list_kref);
136 struct ttm_bo_device *bdev = bo->bdev;
137 size_t acc_size = bo->acc_size;
139 BUG_ON(kref_read(&bo->list_kref));
140 BUG_ON(kref_read(&bo->kref));
141 BUG_ON(atomic_read(&bo->cpu_writers));
142 BUG_ON(bo->mem.mm_node != NULL);
143 BUG_ON(!list_empty(&bo->lru));
144 BUG_ON(!list_empty(&bo->ddestroy));
145 ttm_tt_destroy(bo->ttm);
146 atomic_dec(&bo->glob->bo_count);
147 dma_fence_put(bo->moving);
148 reservation_object_fini(&bo->ttm_resv);
149 mutex_destroy(&bo->wu_mutex);
150 if (bo->destroy)
151 bo->destroy(bo);
152 else {
153 kfree(bo);
155 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
158 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
160 struct ttm_bo_device *bdev = bo->bdev;
161 struct ttm_mem_type_manager *man;
163 reservation_object_assert_held(bo->resv);
165 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
167 BUG_ON(!list_empty(&bo->lru));
169 man = &bdev->man[bo->mem.mem_type];
170 list_add_tail(&bo->lru, &man->lru[bo->priority]);
171 kref_get(&bo->list_kref);
173 if (bo->ttm && !(bo->ttm->page_flags &
174 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
175 list_add_tail(&bo->swap,
176 &bo->glob->swap_lru[bo->priority]);
177 kref_get(&bo->list_kref);
181 EXPORT_SYMBOL(ttm_bo_add_to_lru);
183 static void ttm_bo_ref_bug(struct kref *list_kref)
185 BUG();
188 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
190 if (!list_empty(&bo->swap)) {
191 list_del_init(&bo->swap);
192 kref_put(&bo->list_kref, ttm_bo_ref_bug);
194 if (!list_empty(&bo->lru)) {
195 list_del_init(&bo->lru);
196 kref_put(&bo->list_kref, ttm_bo_ref_bug);
200 * TODO: Add a driver hook to delete from
201 * driver-specific LRU's here.
205 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
207 spin_lock(&bo->glob->lru_lock);
208 ttm_bo_del_from_lru(bo);
209 spin_unlock(&bo->glob->lru_lock);
211 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
213 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
215 reservation_object_assert_held(bo->resv);
217 ttm_bo_del_from_lru(bo);
218 ttm_bo_add_to_lru(bo);
220 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
223 * Call bo->mutex locked.
225 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
227 struct ttm_bo_device *bdev = bo->bdev;
228 struct ttm_bo_global *glob = bo->glob;
229 int ret = 0;
230 uint32_t page_flags = 0;
232 reservation_object_assert_held(bo->resv);
233 bo->ttm = NULL;
235 if (bdev->need_dma32)
236 page_flags |= TTM_PAGE_FLAG_DMA32;
238 switch (bo->type) {
239 case ttm_bo_type_device:
240 if (zero_alloc)
241 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
242 case ttm_bo_type_kernel:
243 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
244 page_flags, glob->dummy_read_page);
245 if (unlikely(bo->ttm == NULL))
246 ret = -ENOMEM;
247 break;
248 case ttm_bo_type_sg:
249 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
250 page_flags | TTM_PAGE_FLAG_SG,
251 glob->dummy_read_page);
252 if (unlikely(bo->ttm == NULL)) {
253 ret = -ENOMEM;
254 break;
256 bo->ttm->sg = bo->sg;
257 break;
258 default:
259 pr_err("Illegal buffer object type\n");
260 ret = -EINVAL;
261 break;
264 return ret;
267 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
268 struct ttm_mem_reg *mem, bool evict,
269 struct ttm_operation_ctx *ctx)
271 struct ttm_bo_device *bdev = bo->bdev;
272 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
273 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
274 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
275 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
276 int ret = 0;
278 if (old_is_pci || new_is_pci ||
279 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
280 ret = ttm_mem_io_lock(old_man, true);
281 if (unlikely(ret != 0))
282 goto out_err;
283 ttm_bo_unmap_virtual_locked(bo);
284 ttm_mem_io_unlock(old_man);
288 * Create and bind a ttm if required.
291 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
292 if (bo->ttm == NULL) {
293 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
294 ret = ttm_bo_add_ttm(bo, zero);
295 if (ret)
296 goto out_err;
299 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
300 if (ret)
301 goto out_err;
303 if (mem->mem_type != TTM_PL_SYSTEM) {
304 ret = ttm_tt_bind(bo->ttm, mem, ctx);
305 if (ret)
306 goto out_err;
309 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
310 if (bdev->driver->move_notify)
311 bdev->driver->move_notify(bo, evict, mem);
312 bo->mem = *mem;
313 mem->mm_node = NULL;
314 goto moved;
318 if (bdev->driver->move_notify)
319 bdev->driver->move_notify(bo, evict, mem);
321 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
322 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
323 ret = ttm_bo_move_ttm(bo, ctx, mem);
324 else if (bdev->driver->move)
325 ret = bdev->driver->move(bo, evict, ctx, mem);
326 else
327 ret = ttm_bo_move_memcpy(bo, ctx, mem);
329 if (ret) {
330 if (bdev->driver->move_notify) {
331 struct ttm_mem_reg tmp_mem = *mem;
332 *mem = bo->mem;
333 bo->mem = tmp_mem;
334 bdev->driver->move_notify(bo, false, mem);
335 bo->mem = *mem;
336 *mem = tmp_mem;
339 goto out_err;
342 moved:
343 if (bo->evicted) {
344 if (bdev->driver->invalidate_caches) {
345 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
346 if (ret)
347 pr_err("Can not flush read caches\n");
349 bo->evicted = false;
352 if (bo->mem.mm_node)
353 bo->offset = (bo->mem.start << PAGE_SHIFT) +
354 bdev->man[bo->mem.mem_type].gpu_offset;
355 else
356 bo->offset = 0;
358 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
359 return 0;
361 out_err:
362 new_man = &bdev->man[bo->mem.mem_type];
363 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
364 ttm_tt_destroy(bo->ttm);
365 bo->ttm = NULL;
368 return ret;
372 * Call bo::reserved.
373 * Will release GPU memory type usage on destruction.
374 * This is the place to put in driver specific hooks to release
375 * driver private resources.
376 * Will release the bo::reserved lock.
379 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
381 if (bo->bdev->driver->move_notify)
382 bo->bdev->driver->move_notify(bo, false, NULL);
384 ttm_tt_destroy(bo->ttm);
385 bo->ttm = NULL;
386 ttm_bo_mem_put(bo, &bo->mem);
389 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
391 int r;
393 if (bo->resv == &bo->ttm_resv)
394 return 0;
396 BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
398 r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
399 if (r)
400 reservation_object_unlock(&bo->ttm_resv);
402 return r;
405 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
407 struct reservation_object_list *fobj;
408 struct dma_fence *fence;
409 int i;
411 fobj = reservation_object_get_list(&bo->ttm_resv);
412 fence = reservation_object_get_excl(&bo->ttm_resv);
413 if (fence && !fence->ops->signaled)
414 dma_fence_enable_sw_signaling(fence);
416 for (i = 0; fobj && i < fobj->shared_count; ++i) {
417 fence = rcu_dereference_protected(fobj->shared[i],
418 reservation_object_held(bo->resv));
420 if (!fence->ops->signaled)
421 dma_fence_enable_sw_signaling(fence);
425 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
427 struct ttm_bo_device *bdev = bo->bdev;
428 struct ttm_bo_global *glob = bo->glob;
429 int ret;
431 ret = ttm_bo_individualize_resv(bo);
432 if (ret) {
433 /* Last resort, if we fail to allocate memory for the
434 * fences block for the BO to become idle
436 reservation_object_wait_timeout_rcu(bo->resv, true, false,
437 30 * HZ);
438 spin_lock(&glob->lru_lock);
439 goto error;
442 spin_lock(&glob->lru_lock);
443 ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
444 if (!ret) {
445 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
446 ttm_bo_del_from_lru(bo);
447 spin_unlock(&glob->lru_lock);
448 if (bo->resv != &bo->ttm_resv)
449 reservation_object_unlock(&bo->ttm_resv);
451 ttm_bo_cleanup_memtype_use(bo);
452 reservation_object_unlock(bo->resv);
453 return;
456 ttm_bo_flush_all_fences(bo);
459 * Make NO_EVICT bos immediately available to
460 * shrinkers, now that they are queued for
461 * destruction.
463 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
464 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
465 ttm_bo_add_to_lru(bo);
468 reservation_object_unlock(bo->resv);
470 if (bo->resv != &bo->ttm_resv)
471 reservation_object_unlock(&bo->ttm_resv);
473 error:
474 kref_get(&bo->list_kref);
475 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
476 spin_unlock(&glob->lru_lock);
478 schedule_delayed_work(&bdev->wq,
479 ((HZ / 100) < 1) ? 1 : HZ / 100);
483 * function ttm_bo_cleanup_refs
484 * If bo idle, remove from delayed- and lru lists, and unref.
485 * If not idle, do nothing.
487 * Must be called with lru_lock and reservation held, this function
488 * will drop the lru lock and optionally the reservation lock before returning.
490 * @interruptible Any sleeps should occur interruptibly.
491 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
492 * @unlock_resv Unlock the reservation lock as well.
495 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
496 bool interruptible, bool no_wait_gpu,
497 bool unlock_resv)
499 struct ttm_bo_global *glob = bo->glob;
500 struct reservation_object *resv;
501 int ret;
503 if (unlikely(list_empty(&bo->ddestroy)))
504 resv = bo->resv;
505 else
506 resv = &bo->ttm_resv;
508 if (reservation_object_test_signaled_rcu(resv, true))
509 ret = 0;
510 else
511 ret = -EBUSY;
513 if (ret && !no_wait_gpu) {
514 long lret;
516 if (unlock_resv)
517 reservation_object_unlock(bo->resv);
518 spin_unlock(&glob->lru_lock);
520 lret = reservation_object_wait_timeout_rcu(resv, true,
521 interruptible,
522 30 * HZ);
524 if (lret < 0)
525 return lret;
526 else if (lret == 0)
527 return -EBUSY;
529 spin_lock(&glob->lru_lock);
530 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
532 * We raced, and lost, someone else holds the reservation now,
533 * and is probably busy in ttm_bo_cleanup_memtype_use.
535 * Even if it's not the case, because we finished waiting any
536 * delayed destruction would succeed, so just return success
537 * here.
539 spin_unlock(&glob->lru_lock);
540 return 0;
542 ret = 0;
545 if (ret || unlikely(list_empty(&bo->ddestroy))) {
546 if (unlock_resv)
547 reservation_object_unlock(bo->resv);
548 spin_unlock(&glob->lru_lock);
549 return ret;
552 ttm_bo_del_from_lru(bo);
553 list_del_init(&bo->ddestroy);
554 kref_put(&bo->list_kref, ttm_bo_ref_bug);
556 spin_unlock(&glob->lru_lock);
557 ttm_bo_cleanup_memtype_use(bo);
559 if (unlock_resv)
560 reservation_object_unlock(bo->resv);
562 return 0;
566 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
567 * encountered buffers.
569 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
571 struct ttm_bo_global *glob = bdev->glob;
572 struct list_head removed;
573 bool empty;
575 INIT_LIST_HEAD(&removed);
577 spin_lock(&glob->lru_lock);
578 while (!list_empty(&bdev->ddestroy)) {
579 struct ttm_buffer_object *bo;
581 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
582 ddestroy);
583 kref_get(&bo->list_kref);
584 list_move_tail(&bo->ddestroy, &removed);
586 if (remove_all || bo->resv != &bo->ttm_resv) {
587 spin_unlock(&glob->lru_lock);
588 reservation_object_lock(bo->resv, NULL);
590 spin_lock(&glob->lru_lock);
591 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
593 } else if (reservation_object_trylock(bo->resv)) {
594 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
595 } else {
596 spin_unlock(&glob->lru_lock);
599 kref_put(&bo->list_kref, ttm_bo_release_list);
600 spin_lock(&glob->lru_lock);
602 list_splice_tail(&removed, &bdev->ddestroy);
603 empty = list_empty(&bdev->ddestroy);
604 spin_unlock(&glob->lru_lock);
606 return empty;
609 static void ttm_bo_delayed_workqueue(struct work_struct *work)
611 struct ttm_bo_device *bdev =
612 container_of(work, struct ttm_bo_device, wq.work);
614 if (!ttm_bo_delayed_delete(bdev, false)) {
615 schedule_delayed_work(&bdev->wq,
616 ((HZ / 100) < 1) ? 1 : HZ / 100);
620 static void ttm_bo_release(struct kref *kref)
622 struct ttm_buffer_object *bo =
623 container_of(kref, struct ttm_buffer_object, kref);
624 struct ttm_bo_device *bdev = bo->bdev;
625 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
627 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
628 ttm_mem_io_lock(man, false);
629 ttm_mem_io_free_vm(bo);
630 ttm_mem_io_unlock(man);
631 ttm_bo_cleanup_refs_or_queue(bo);
632 kref_put(&bo->list_kref, ttm_bo_release_list);
635 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
637 struct ttm_buffer_object *bo = *p_bo;
639 *p_bo = NULL;
640 kref_put(&bo->kref, ttm_bo_release);
642 EXPORT_SYMBOL(ttm_bo_unref);
644 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
646 return cancel_delayed_work_sync(&bdev->wq);
648 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
650 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
652 if (resched)
653 schedule_delayed_work(&bdev->wq,
654 ((HZ / 100) < 1) ? 1 : HZ / 100);
656 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
658 static int ttm_bo_evict(struct ttm_buffer_object *bo,
659 struct ttm_operation_ctx *ctx)
661 struct ttm_bo_device *bdev = bo->bdev;
662 struct ttm_mem_reg evict_mem;
663 struct ttm_placement placement;
664 int ret = 0;
666 reservation_object_assert_held(bo->resv);
668 evict_mem = bo->mem;
669 evict_mem.mm_node = NULL;
670 evict_mem.bus.io_reserved_vm = false;
671 evict_mem.bus.io_reserved_count = 0;
673 placement.num_placement = 0;
674 placement.num_busy_placement = 0;
675 bdev->driver->evict_flags(bo, &placement);
676 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
677 if (ret) {
678 if (ret != -ERESTARTSYS) {
679 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
680 bo);
681 ttm_bo_mem_space_debug(bo, &placement);
683 goto out;
686 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
687 if (unlikely(ret)) {
688 if (ret != -ERESTARTSYS)
689 pr_err("Buffer eviction failed\n");
690 ttm_bo_mem_put(bo, &evict_mem);
691 goto out;
693 bo->evicted = true;
694 out:
695 return ret;
698 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
699 const struct ttm_place *place)
701 /* Don't evict this BO if it's outside of the
702 * requested placement range
704 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
705 (place->lpfn && place->lpfn <= bo->mem.start))
706 return false;
708 return true;
710 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
713 * Check the target bo is allowable to be evicted or swapout, including cases:
715 * a. if share same reservation object with ctx->resv, have assumption
716 * reservation objects should already be locked, so not lock again and
717 * return true directly when either the opreation allow_reserved_eviction
718 * or the target bo already is in delayed free list;
720 * b. Otherwise, trylock it.
722 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
723 struct ttm_operation_ctx *ctx, bool *locked)
725 bool ret = false;
727 *locked = false;
728 if (bo->resv == ctx->resv) {
729 reservation_object_assert_held(bo->resv);
730 if (ctx->allow_reserved_eviction || !list_empty(&bo->ddestroy))
731 ret = true;
732 } else {
733 *locked = reservation_object_trylock(bo->resv);
734 ret = *locked;
737 return ret;
740 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
741 uint32_t mem_type,
742 const struct ttm_place *place,
743 struct ttm_operation_ctx *ctx)
745 struct ttm_bo_global *glob = bdev->glob;
746 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
747 struct ttm_buffer_object *bo = NULL;
748 bool locked = false;
749 unsigned i;
750 int ret;
752 spin_lock(&glob->lru_lock);
753 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
754 list_for_each_entry(bo, &man->lru[i], lru) {
755 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
756 continue;
758 if (place && !bdev->driver->eviction_valuable(bo,
759 place)) {
760 if (locked)
761 reservation_object_unlock(bo->resv);
762 continue;
764 break;
767 /* If the inner loop terminated early, we have our candidate */
768 if (&bo->lru != &man->lru[i])
769 break;
771 bo = NULL;
774 if (!bo) {
775 spin_unlock(&glob->lru_lock);
776 return -EBUSY;
779 kref_get(&bo->list_kref);
781 if (!list_empty(&bo->ddestroy)) {
782 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
783 ctx->no_wait_gpu, locked);
784 kref_put(&bo->list_kref, ttm_bo_release_list);
785 return ret;
788 ttm_bo_del_from_lru(bo);
789 spin_unlock(&glob->lru_lock);
791 ret = ttm_bo_evict(bo, ctx);
792 if (locked) {
793 ttm_bo_unreserve(bo);
794 } else {
795 spin_lock(&glob->lru_lock);
796 ttm_bo_add_to_lru(bo);
797 spin_unlock(&glob->lru_lock);
800 kref_put(&bo->list_kref, ttm_bo_release_list);
801 return ret;
804 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
806 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
808 if (mem->mm_node)
809 (*man->func->put_node)(man, mem);
811 EXPORT_SYMBOL(ttm_bo_mem_put);
814 * Add the last move fence to the BO and reserve a new shared slot.
816 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
817 struct ttm_mem_type_manager *man,
818 struct ttm_mem_reg *mem)
820 struct dma_fence *fence;
821 int ret;
823 spin_lock(&man->move_lock);
824 fence = dma_fence_get(man->move);
825 spin_unlock(&man->move_lock);
827 if (fence) {
828 reservation_object_add_shared_fence(bo->resv, fence);
830 ret = reservation_object_reserve_shared(bo->resv);
831 if (unlikely(ret))
832 return ret;
834 dma_fence_put(bo->moving);
835 bo->moving = fence;
838 return 0;
842 * Repeatedly evict memory from the LRU for @mem_type until we create enough
843 * space, or we've evicted everything and there isn't enough space.
845 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
846 uint32_t mem_type,
847 const struct ttm_place *place,
848 struct ttm_mem_reg *mem,
849 struct ttm_operation_ctx *ctx)
851 struct ttm_bo_device *bdev = bo->bdev;
852 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
853 int ret;
855 do {
856 ret = (*man->func->get_node)(man, bo, place, mem);
857 if (unlikely(ret != 0))
858 return ret;
859 if (mem->mm_node)
860 break;
861 ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
862 if (unlikely(ret != 0))
863 return ret;
864 } while (1);
865 mem->mem_type = mem_type;
866 return ttm_bo_add_move_fence(bo, man, mem);
869 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
870 uint32_t cur_placement,
871 uint32_t proposed_placement)
873 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
874 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
877 * Keep current caching if possible.
880 if ((cur_placement & caching) != 0)
881 result |= (cur_placement & caching);
882 else if ((man->default_caching & caching) != 0)
883 result |= man->default_caching;
884 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
885 result |= TTM_PL_FLAG_CACHED;
886 else if ((TTM_PL_FLAG_WC & caching) != 0)
887 result |= TTM_PL_FLAG_WC;
888 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
889 result |= TTM_PL_FLAG_UNCACHED;
891 return result;
894 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
895 uint32_t mem_type,
896 const struct ttm_place *place,
897 uint32_t *masked_placement)
899 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
901 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
902 return false;
904 if ((place->flags & man->available_caching) == 0)
905 return false;
907 cur_flags |= (place->flags & man->available_caching);
909 *masked_placement = cur_flags;
910 return true;
914 * Creates space for memory region @mem according to its type.
916 * This function first searches for free space in compatible memory types in
917 * the priority order defined by the driver. If free space isn't found, then
918 * ttm_bo_mem_force_space is attempted in priority order to evict and find
919 * space.
921 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
922 struct ttm_placement *placement,
923 struct ttm_mem_reg *mem,
924 struct ttm_operation_ctx *ctx)
926 struct ttm_bo_device *bdev = bo->bdev;
927 struct ttm_mem_type_manager *man;
928 uint32_t mem_type = TTM_PL_SYSTEM;
929 uint32_t cur_flags = 0;
930 bool type_found = false;
931 bool type_ok = false;
932 bool has_erestartsys = false;
933 int i, ret;
935 ret = reservation_object_reserve_shared(bo->resv);
936 if (unlikely(ret))
937 return ret;
939 mem->mm_node = NULL;
940 for (i = 0; i < placement->num_placement; ++i) {
941 const struct ttm_place *place = &placement->placement[i];
943 ret = ttm_mem_type_from_place(place, &mem_type);
944 if (ret)
945 return ret;
946 man = &bdev->man[mem_type];
947 if (!man->has_type || !man->use_type)
948 continue;
950 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
951 &cur_flags);
953 if (!type_ok)
954 continue;
956 type_found = true;
957 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
958 cur_flags);
960 * Use the access and other non-mapping-related flag bits from
961 * the memory placement flags to the current flags
963 ttm_flag_masked(&cur_flags, place->flags,
964 ~TTM_PL_MASK_MEMTYPE);
966 if (mem_type == TTM_PL_SYSTEM)
967 break;
969 ret = (*man->func->get_node)(man, bo, place, mem);
970 if (unlikely(ret))
971 return ret;
973 if (mem->mm_node) {
974 ret = ttm_bo_add_move_fence(bo, man, mem);
975 if (unlikely(ret)) {
976 (*man->func->put_node)(man, mem);
977 return ret;
979 break;
983 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
984 mem->mem_type = mem_type;
985 mem->placement = cur_flags;
986 return 0;
989 for (i = 0; i < placement->num_busy_placement; ++i) {
990 const struct ttm_place *place = &placement->busy_placement[i];
992 ret = ttm_mem_type_from_place(place, &mem_type);
993 if (ret)
994 return ret;
995 man = &bdev->man[mem_type];
996 if (!man->has_type || !man->use_type)
997 continue;
998 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
999 continue;
1001 type_found = true;
1002 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1003 cur_flags);
1005 * Use the access and other non-mapping-related flag bits from
1006 * the memory placement flags to the current flags
1008 ttm_flag_masked(&cur_flags, place->flags,
1009 ~TTM_PL_MASK_MEMTYPE);
1011 if (mem_type == TTM_PL_SYSTEM) {
1012 mem->mem_type = mem_type;
1013 mem->placement = cur_flags;
1014 mem->mm_node = NULL;
1015 return 0;
1018 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem, ctx);
1019 if (ret == 0 && mem->mm_node) {
1020 mem->placement = cur_flags;
1021 return 0;
1023 if (ret == -ERESTARTSYS)
1024 has_erestartsys = true;
1027 if (!type_found) {
1028 pr_err(TTM_PFX "No compatible memory type found\n");
1029 return -EINVAL;
1032 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1034 EXPORT_SYMBOL(ttm_bo_mem_space);
1036 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1037 struct ttm_placement *placement,
1038 struct ttm_operation_ctx *ctx)
1040 int ret = 0;
1041 struct ttm_mem_reg mem;
1043 reservation_object_assert_held(bo->resv);
1045 mem.num_pages = bo->num_pages;
1046 mem.size = mem.num_pages << PAGE_SHIFT;
1047 mem.page_alignment = bo->mem.page_alignment;
1048 mem.bus.io_reserved_vm = false;
1049 mem.bus.io_reserved_count = 0;
1051 * Determine where to move the buffer.
1053 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1054 if (ret)
1055 goto out_unlock;
1056 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1057 out_unlock:
1058 if (ret && mem.mm_node)
1059 ttm_bo_mem_put(bo, &mem);
1060 return ret;
1063 static bool ttm_bo_places_compat(const struct ttm_place *places,
1064 unsigned num_placement,
1065 struct ttm_mem_reg *mem,
1066 uint32_t *new_flags)
1068 unsigned i;
1070 for (i = 0; i < num_placement; i++) {
1071 const struct ttm_place *heap = &places[i];
1073 if (mem->mm_node && (mem->start < heap->fpfn ||
1074 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1075 continue;
1077 *new_flags = heap->flags;
1078 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1079 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1080 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1081 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1082 return true;
1084 return false;
1087 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1088 struct ttm_mem_reg *mem,
1089 uint32_t *new_flags)
1091 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1092 mem, new_flags))
1093 return true;
1095 if ((placement->busy_placement != placement->placement ||
1096 placement->num_busy_placement > placement->num_placement) &&
1097 ttm_bo_places_compat(placement->busy_placement,
1098 placement->num_busy_placement,
1099 mem, new_flags))
1100 return true;
1102 return false;
1104 EXPORT_SYMBOL(ttm_bo_mem_compat);
1106 int ttm_bo_validate(struct ttm_buffer_object *bo,
1107 struct ttm_placement *placement,
1108 struct ttm_operation_ctx *ctx)
1110 int ret;
1111 uint32_t new_flags;
1113 reservation_object_assert_held(bo->resv);
1115 * Check whether we need to move buffer.
1117 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1118 ret = ttm_bo_move_buffer(bo, placement, ctx);
1119 if (ret)
1120 return ret;
1121 } else {
1123 * Use the access and other non-mapping-related flag bits from
1124 * the compatible memory placement flags to the active flags
1126 ttm_flag_masked(&bo->mem.placement, new_flags,
1127 ~TTM_PL_MASK_MEMTYPE);
1130 * We might need to add a TTM.
1132 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1133 ret = ttm_bo_add_ttm(bo, true);
1134 if (ret)
1135 return ret;
1137 return 0;
1139 EXPORT_SYMBOL(ttm_bo_validate);
1141 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1142 struct ttm_buffer_object *bo,
1143 unsigned long size,
1144 enum ttm_bo_type type,
1145 struct ttm_placement *placement,
1146 uint32_t page_alignment,
1147 struct ttm_operation_ctx *ctx,
1148 struct file *persistent_swap_storage,
1149 size_t acc_size,
1150 struct sg_table *sg,
1151 struct reservation_object *resv,
1152 void (*destroy) (struct ttm_buffer_object *))
1154 int ret = 0;
1155 unsigned long num_pages;
1156 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1157 bool locked;
1159 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1160 if (ret) {
1161 pr_err("Out of kernel memory\n");
1162 if (destroy)
1163 (*destroy)(bo);
1164 else
1165 kfree(bo);
1166 return -ENOMEM;
1169 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1170 if (num_pages == 0) {
1171 pr_err("Illegal buffer object size\n");
1172 if (destroy)
1173 (*destroy)(bo);
1174 else
1175 kfree(bo);
1176 ttm_mem_global_free(mem_glob, acc_size);
1177 return -EINVAL;
1179 bo->destroy = destroy;
1181 kref_init(&bo->kref);
1182 kref_init(&bo->list_kref);
1183 atomic_set(&bo->cpu_writers, 0);
1184 INIT_LIST_HEAD(&bo->lru);
1185 INIT_LIST_HEAD(&bo->ddestroy);
1186 INIT_LIST_HEAD(&bo->swap);
1187 INIT_LIST_HEAD(&bo->io_reserve_lru);
1188 mutex_init(&bo->wu_mutex);
1189 bo->bdev = bdev;
1190 bo->glob = bdev->glob;
1191 bo->type = type;
1192 bo->num_pages = num_pages;
1193 bo->mem.size = num_pages << PAGE_SHIFT;
1194 bo->mem.mem_type = TTM_PL_SYSTEM;
1195 bo->mem.num_pages = bo->num_pages;
1196 bo->mem.mm_node = NULL;
1197 bo->mem.page_alignment = page_alignment;
1198 bo->mem.bus.io_reserved_vm = false;
1199 bo->mem.bus.io_reserved_count = 0;
1200 bo->moving = NULL;
1201 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1202 bo->persistent_swap_storage = persistent_swap_storage;
1203 bo->acc_size = acc_size;
1204 bo->sg = sg;
1205 if (resv) {
1206 bo->resv = resv;
1207 reservation_object_assert_held(bo->resv);
1208 } else {
1209 bo->resv = &bo->ttm_resv;
1211 reservation_object_init(&bo->ttm_resv);
1212 atomic_inc(&bo->glob->bo_count);
1213 drm_vma_node_reset(&bo->vma_node);
1214 bo->priority = 0;
1217 * For ttm_bo_type_device buffers, allocate
1218 * address space from the device.
1220 if (bo->type == ttm_bo_type_device ||
1221 bo->type == ttm_bo_type_sg)
1222 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1223 bo->mem.num_pages);
1225 /* passed reservation objects should already be locked,
1226 * since otherwise lockdep will be angered in radeon.
1228 if (!resv) {
1229 locked = reservation_object_trylock(bo->resv);
1230 WARN_ON(!locked);
1233 if (likely(!ret))
1234 ret = ttm_bo_validate(bo, placement, ctx);
1236 if (unlikely(ret)) {
1237 if (!resv)
1238 ttm_bo_unreserve(bo);
1240 ttm_bo_unref(&bo);
1241 return ret;
1244 if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1245 spin_lock(&bo->glob->lru_lock);
1246 ttm_bo_add_to_lru(bo);
1247 spin_unlock(&bo->glob->lru_lock);
1250 return ret;
1252 EXPORT_SYMBOL(ttm_bo_init_reserved);
1254 int ttm_bo_init(struct ttm_bo_device *bdev,
1255 struct ttm_buffer_object *bo,
1256 unsigned long size,
1257 enum ttm_bo_type type,
1258 struct ttm_placement *placement,
1259 uint32_t page_alignment,
1260 bool interruptible,
1261 struct file *persistent_swap_storage,
1262 size_t acc_size,
1263 struct sg_table *sg,
1264 struct reservation_object *resv,
1265 void (*destroy) (struct ttm_buffer_object *))
1267 struct ttm_operation_ctx ctx = { interruptible, false };
1268 int ret;
1270 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1271 page_alignment, &ctx,
1272 persistent_swap_storage, acc_size,
1273 sg, resv, destroy);
1274 if (ret)
1275 return ret;
1277 if (!resv)
1278 ttm_bo_unreserve(bo);
1280 return 0;
1282 EXPORT_SYMBOL(ttm_bo_init);
1284 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1285 unsigned long bo_size,
1286 unsigned struct_size)
1288 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1289 size_t size = 0;
1291 size += ttm_round_pot(struct_size);
1292 size += ttm_round_pot(npages * sizeof(void *));
1293 size += ttm_round_pot(sizeof(struct ttm_tt));
1294 return size;
1296 EXPORT_SYMBOL(ttm_bo_acc_size);
1298 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1299 unsigned long bo_size,
1300 unsigned struct_size)
1302 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1303 size_t size = 0;
1305 size += ttm_round_pot(struct_size);
1306 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1307 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1308 return size;
1310 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1312 int ttm_bo_create(struct ttm_bo_device *bdev,
1313 unsigned long size,
1314 enum ttm_bo_type type,
1315 struct ttm_placement *placement,
1316 uint32_t page_alignment,
1317 bool interruptible,
1318 struct file *persistent_swap_storage,
1319 struct ttm_buffer_object **p_bo)
1321 struct ttm_buffer_object *bo;
1322 size_t acc_size;
1323 int ret;
1325 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1326 if (unlikely(bo == NULL))
1327 return -ENOMEM;
1329 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1330 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1331 interruptible, persistent_swap_storage, acc_size,
1332 NULL, NULL, NULL);
1333 if (likely(ret == 0))
1334 *p_bo = bo;
1336 return ret;
1338 EXPORT_SYMBOL(ttm_bo_create);
1340 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1341 unsigned mem_type)
1343 struct ttm_operation_ctx ctx = { false, false };
1344 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1345 struct ttm_bo_global *glob = bdev->glob;
1346 struct dma_fence *fence;
1347 int ret;
1348 unsigned i;
1351 * Can't use standard list traversal since we're unlocking.
1354 spin_lock(&glob->lru_lock);
1355 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1356 while (!list_empty(&man->lru[i])) {
1357 spin_unlock(&glob->lru_lock);
1358 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx);
1359 if (ret)
1360 return ret;
1361 spin_lock(&glob->lru_lock);
1364 spin_unlock(&glob->lru_lock);
1366 spin_lock(&man->move_lock);
1367 fence = dma_fence_get(man->move);
1368 spin_unlock(&man->move_lock);
1370 if (fence) {
1371 ret = dma_fence_wait(fence, false);
1372 dma_fence_put(fence);
1373 if (ret)
1374 return ret;
1377 return 0;
1380 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1382 struct ttm_mem_type_manager *man;
1383 int ret = -EINVAL;
1385 if (mem_type >= TTM_NUM_MEM_TYPES) {
1386 pr_err("Illegal memory type %d\n", mem_type);
1387 return ret;
1389 man = &bdev->man[mem_type];
1391 if (!man->has_type) {
1392 pr_err("Trying to take down uninitialized memory manager type %u\n",
1393 mem_type);
1394 return ret;
1397 man->use_type = false;
1398 man->has_type = false;
1400 ret = 0;
1401 if (mem_type > 0) {
1402 ret = ttm_bo_force_list_clean(bdev, mem_type);
1403 if (ret) {
1404 pr_err("Cleanup eviction failed\n");
1405 return ret;
1408 ret = (*man->func->takedown)(man);
1411 dma_fence_put(man->move);
1412 man->move = NULL;
1414 return ret;
1416 EXPORT_SYMBOL(ttm_bo_clean_mm);
1418 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1420 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1422 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1423 pr_err("Illegal memory manager memory type %u\n", mem_type);
1424 return -EINVAL;
1427 if (!man->has_type) {
1428 pr_err("Memory type %u has not been initialized\n", mem_type);
1429 return 0;
1432 return ttm_bo_force_list_clean(bdev, mem_type);
1434 EXPORT_SYMBOL(ttm_bo_evict_mm);
1436 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1437 unsigned long p_size)
1439 int ret;
1440 struct ttm_mem_type_manager *man;
1441 unsigned i;
1443 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1444 man = &bdev->man[type];
1445 BUG_ON(man->has_type);
1446 man->io_reserve_fastpath = true;
1447 man->use_io_reserve_lru = false;
1448 mutex_init(&man->io_reserve_mutex);
1449 spin_lock_init(&man->move_lock);
1450 INIT_LIST_HEAD(&man->io_reserve_lru);
1452 ret = bdev->driver->init_mem_type(bdev, type, man);
1453 if (ret)
1454 return ret;
1455 man->bdev = bdev;
1457 if (type != TTM_PL_SYSTEM) {
1458 ret = (*man->func->init)(man, p_size);
1459 if (ret)
1460 return ret;
1462 man->has_type = true;
1463 man->use_type = true;
1464 man->size = p_size;
1466 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1467 INIT_LIST_HEAD(&man->lru[i]);
1468 man->move = NULL;
1470 return 0;
1472 EXPORT_SYMBOL(ttm_bo_init_mm);
1474 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1476 struct ttm_bo_global *glob =
1477 container_of(kobj, struct ttm_bo_global, kobj);
1479 __free_page(glob->dummy_read_page);
1480 kfree(glob);
1483 void ttm_bo_global_release(struct drm_global_reference *ref)
1485 struct ttm_bo_global *glob = ref->object;
1487 kobject_del(&glob->kobj);
1488 kobject_put(&glob->kobj);
1490 EXPORT_SYMBOL(ttm_bo_global_release);
1492 int ttm_bo_global_init(struct drm_global_reference *ref)
1494 struct ttm_bo_global_ref *bo_ref =
1495 container_of(ref, struct ttm_bo_global_ref, ref);
1496 struct ttm_bo_global *glob = ref->object;
1497 int ret;
1498 unsigned i;
1500 mutex_init(&glob->device_list_mutex);
1501 spin_lock_init(&glob->lru_lock);
1502 glob->mem_glob = bo_ref->mem_glob;
1503 glob->mem_glob->bo_glob = glob;
1504 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1506 if (unlikely(glob->dummy_read_page == NULL)) {
1507 ret = -ENOMEM;
1508 goto out_no_drp;
1511 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1512 INIT_LIST_HEAD(&glob->swap_lru[i]);
1513 INIT_LIST_HEAD(&glob->device_list);
1514 atomic_set(&glob->bo_count, 0);
1516 ret = kobject_init_and_add(
1517 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1518 if (unlikely(ret != 0))
1519 kobject_put(&glob->kobj);
1520 return ret;
1521 out_no_drp:
1522 kfree(glob);
1523 return ret;
1525 EXPORT_SYMBOL(ttm_bo_global_init);
1528 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1530 int ret = 0;
1531 unsigned i = TTM_NUM_MEM_TYPES;
1532 struct ttm_mem_type_manager *man;
1533 struct ttm_bo_global *glob = bdev->glob;
1535 while (i--) {
1536 man = &bdev->man[i];
1537 if (man->has_type) {
1538 man->use_type = false;
1539 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1540 ret = -EBUSY;
1541 pr_err("DRM memory manager type %d is not clean\n",
1544 man->has_type = false;
1548 mutex_lock(&glob->device_list_mutex);
1549 list_del(&bdev->device_list);
1550 mutex_unlock(&glob->device_list_mutex);
1552 cancel_delayed_work_sync(&bdev->wq);
1554 if (ttm_bo_delayed_delete(bdev, true))
1555 pr_debug("Delayed destroy list was clean\n");
1557 spin_lock(&glob->lru_lock);
1558 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1559 if (list_empty(&bdev->man[0].lru[0]))
1560 pr_debug("Swap list %d was clean\n", i);
1561 spin_unlock(&glob->lru_lock);
1563 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1565 return ret;
1567 EXPORT_SYMBOL(ttm_bo_device_release);
1569 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1570 struct ttm_bo_global *glob,
1571 struct ttm_bo_driver *driver,
1572 struct address_space *mapping,
1573 uint64_t file_page_offset,
1574 bool need_dma32)
1576 int ret = -EINVAL;
1578 bdev->driver = driver;
1580 memset(bdev->man, 0, sizeof(bdev->man));
1583 * Initialize the system memory buffer type.
1584 * Other types need to be driver / IOCTL initialized.
1586 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1587 if (unlikely(ret != 0))
1588 goto out_no_sys;
1590 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1591 0x10000000);
1592 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1593 INIT_LIST_HEAD(&bdev->ddestroy);
1594 bdev->dev_mapping = mapping;
1595 bdev->glob = glob;
1596 bdev->need_dma32 = need_dma32;
1597 mutex_lock(&glob->device_list_mutex);
1598 list_add_tail(&bdev->device_list, &glob->device_list);
1599 mutex_unlock(&glob->device_list_mutex);
1601 return 0;
1602 out_no_sys:
1603 return ret;
1605 EXPORT_SYMBOL(ttm_bo_device_init);
1608 * buffer object vm functions.
1611 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1613 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1615 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1616 if (mem->mem_type == TTM_PL_SYSTEM)
1617 return false;
1619 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1620 return false;
1622 if (mem->placement & TTM_PL_FLAG_CACHED)
1623 return false;
1625 return true;
1628 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1630 struct ttm_bo_device *bdev = bo->bdev;
1632 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1633 ttm_mem_io_free_vm(bo);
1636 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1638 struct ttm_bo_device *bdev = bo->bdev;
1639 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1641 ttm_mem_io_lock(man, false);
1642 ttm_bo_unmap_virtual_locked(bo);
1643 ttm_mem_io_unlock(man);
1647 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1649 int ttm_bo_wait(struct ttm_buffer_object *bo,
1650 bool interruptible, bool no_wait)
1652 long timeout = 15 * HZ;
1654 if (no_wait) {
1655 if (reservation_object_test_signaled_rcu(bo->resv, true))
1656 return 0;
1657 else
1658 return -EBUSY;
1661 timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1662 interruptible, timeout);
1663 if (timeout < 0)
1664 return timeout;
1666 if (timeout == 0)
1667 return -EBUSY;
1669 reservation_object_add_excl_fence(bo->resv, NULL);
1670 return 0;
1672 EXPORT_SYMBOL(ttm_bo_wait);
1674 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1676 int ret = 0;
1679 * Using ttm_bo_reserve makes sure the lru lists are updated.
1682 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1683 if (unlikely(ret != 0))
1684 return ret;
1685 ret = ttm_bo_wait(bo, true, no_wait);
1686 if (likely(ret == 0))
1687 atomic_inc(&bo->cpu_writers);
1688 ttm_bo_unreserve(bo);
1689 return ret;
1691 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1693 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1695 atomic_dec(&bo->cpu_writers);
1697 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1700 * A buffer object shrink method that tries to swap out the first
1701 * buffer object on the bo_global::swap_lru list.
1703 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1705 struct ttm_buffer_object *bo;
1706 int ret = -EBUSY;
1707 bool locked;
1708 unsigned i;
1710 spin_lock(&glob->lru_lock);
1711 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1712 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1713 if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked)) {
1714 ret = 0;
1715 break;
1718 if (!ret)
1719 break;
1722 if (ret) {
1723 spin_unlock(&glob->lru_lock);
1724 return ret;
1727 kref_get(&bo->list_kref);
1729 if (!list_empty(&bo->ddestroy)) {
1730 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1731 kref_put(&bo->list_kref, ttm_bo_release_list);
1732 return ret;
1735 ttm_bo_del_from_lru(bo);
1736 spin_unlock(&glob->lru_lock);
1739 * Move to system cached
1742 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1743 bo->ttm->caching_state != tt_cached) {
1744 struct ttm_operation_ctx ctx = { false, false };
1745 struct ttm_mem_reg evict_mem;
1747 evict_mem = bo->mem;
1748 evict_mem.mm_node = NULL;
1749 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1750 evict_mem.mem_type = TTM_PL_SYSTEM;
1752 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1753 if (unlikely(ret != 0))
1754 goto out;
1758 * Make sure BO is idle.
1761 ret = ttm_bo_wait(bo, false, false);
1762 if (unlikely(ret != 0))
1763 goto out;
1765 ttm_bo_unmap_virtual(bo);
1768 * Swap out. Buffer will be swapped in again as soon as
1769 * anyone tries to access a ttm page.
1772 if (bo->bdev->driver->swap_notify)
1773 bo->bdev->driver->swap_notify(bo);
1775 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1776 out:
1780 * Unreserve without putting on LRU to avoid swapping out an
1781 * already swapped buffer.
1783 if (locked)
1784 reservation_object_unlock(bo->resv);
1785 kref_put(&bo->list_kref, ttm_bo_release_list);
1786 return ret;
1788 EXPORT_SYMBOL(ttm_bo_swapout);
1790 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1792 struct ttm_operation_ctx ctx = {
1793 .interruptible = false,
1794 .no_wait_gpu = false
1797 while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1800 EXPORT_SYMBOL(ttm_bo_swapout_all);
1803 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1804 * unreserved
1806 * @bo: Pointer to buffer
1808 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1810 int ret;
1813 * In the absense of a wait_unlocked API,
1814 * Use the bo::wu_mutex to avoid triggering livelocks due to
1815 * concurrent use of this function. Note that this use of
1816 * bo::wu_mutex can go away if we change locking order to
1817 * mmap_sem -> bo::reserve.
1819 ret = mutex_lock_interruptible(&bo->wu_mutex);
1820 if (unlikely(ret != 0))
1821 return -ERESTARTSYS;
1822 if (!ww_mutex_is_locked(&bo->resv->lock))
1823 goto out_unlock;
1824 ret = reservation_object_lock_interruptible(bo->resv, NULL);
1825 if (ret == -EINTR)
1826 ret = -ERESTARTSYS;
1827 if (unlikely(ret != 0))
1828 goto out_unlock;
1829 reservation_object_unlock(bo->resv);
1831 out_unlock:
1832 mutex_unlock(&bo->wu_mutex);
1833 return ret;