Loading...
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <drm/ttm/ttm_bo.h>
35#include <drm/ttm/ttm_placement.h>
36#include <drm/ttm/ttm_tt.h>
37
38#include <linux/jiffies.h>
39#include <linux/slab.h>
40#include <linux/sched.h>
41#include <linux/mm.h>
42#include <linux/file.h>
43#include <linux/module.h>
44#include <linux/atomic.h>
45#include <linux/dma-resv.h>
46
47#include "ttm_module.h"
48
49static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
50 struct ttm_placement *placement)
51{
52 struct drm_printer p = drm_dbg_printer(NULL, DRM_UT_CORE, TTM_PFX);
53 struct ttm_resource_manager *man;
54 int i, mem_type;
55
56 for (i = 0; i < placement->num_placement; i++) {
57 mem_type = placement->placement[i].mem_type;
58 drm_printf(&p, " placement[%d]=0x%08X (%d)\n",
59 i, placement->placement[i].flags, mem_type);
60 man = ttm_manager_type(bo->bdev, mem_type);
61 ttm_resource_manager_debug(man, &p);
62 }
63}
64
65/**
66 * ttm_bo_move_to_lru_tail
67 *
68 * @bo: The buffer object.
69 *
70 * Move this BO to the tail of all lru lists used to lookup and reserve an
71 * object. This function must be called with struct ttm_global::lru_lock
72 * held, and is used to make a BO less likely to be considered for eviction.
73 */
74void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
75{
76 dma_resv_assert_held(bo->base.resv);
77
78 if (bo->resource)
79 ttm_resource_move_to_lru_tail(bo->resource);
80}
81EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
82
83/**
84 * ttm_bo_set_bulk_move - update BOs bulk move object
85 *
86 * @bo: The buffer object.
87 * @bulk: bulk move structure
88 *
89 * Update the BOs bulk move object, making sure that resources are added/removed
90 * as well. A bulk move allows to move many resource on the LRU at once,
91 * resulting in much less overhead of maintaining the LRU.
92 * The only requirement is that the resources stay together on the LRU and are
93 * never separated. This is enforces by setting the bulk_move structure on a BO.
94 * ttm_lru_bulk_move_tail() should be used to move all resources to the tail of
95 * their LRU list.
96 */
97void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
98 struct ttm_lru_bulk_move *bulk)
99{
100 dma_resv_assert_held(bo->base.resv);
101
102 if (bo->bulk_move == bulk)
103 return;
104
105 spin_lock(&bo->bdev->lru_lock);
106 if (bo->resource)
107 ttm_resource_del_bulk_move(bo->resource, bo);
108 bo->bulk_move = bulk;
109 if (bo->resource)
110 ttm_resource_add_bulk_move(bo->resource, bo);
111 spin_unlock(&bo->bdev->lru_lock);
112}
113EXPORT_SYMBOL(ttm_bo_set_bulk_move);
114
115static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
116 struct ttm_resource *mem, bool evict,
117 struct ttm_operation_ctx *ctx,
118 struct ttm_place *hop)
119{
120 struct ttm_device *bdev = bo->bdev;
121 bool old_use_tt, new_use_tt;
122 int ret;
123
124 old_use_tt = !bo->resource || ttm_manager_type(bdev, bo->resource->mem_type)->use_tt;
125 new_use_tt = ttm_manager_type(bdev, mem->mem_type)->use_tt;
126
127 ttm_bo_unmap_virtual(bo);
128
129 /*
130 * Create and bind a ttm if required.
131 */
132
133 if (new_use_tt) {
134 /* Zero init the new TTM structure if the old location should
135 * have used one as well.
136 */
137 ret = ttm_tt_create(bo, old_use_tt);
138 if (ret)
139 goto out_err;
140
141 if (mem->mem_type != TTM_PL_SYSTEM) {
142 ret = ttm_bo_populate(bo, ctx);
143 if (ret)
144 goto out_err;
145 }
146 }
147
148 ret = dma_resv_reserve_fences(bo->base.resv, 1);
149 if (ret)
150 goto out_err;
151
152 ret = bdev->funcs->move(bo, evict, ctx, mem, hop);
153 if (ret) {
154 if (ret == -EMULTIHOP)
155 return ret;
156 goto out_err;
157 }
158
159 ctx->bytes_moved += bo->base.size;
160 return 0;
161
162out_err:
163 if (!old_use_tt)
164 ttm_bo_tt_destroy(bo);
165
166 return ret;
167}
168
169/*
170 * Call bo::reserved.
171 * Will release GPU memory type usage on destruction.
172 * This is the place to put in driver specific hooks to release
173 * driver private resources.
174 * Will release the bo::reserved lock.
175 */
176
177static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
178{
179 if (bo->bdev->funcs->delete_mem_notify)
180 bo->bdev->funcs->delete_mem_notify(bo);
181
182 ttm_bo_tt_destroy(bo);
183 ttm_resource_free(bo, &bo->resource);
184}
185
186static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
187{
188 int r;
189
190 if (bo->base.resv == &bo->base._resv)
191 return 0;
192
193 BUG_ON(!dma_resv_trylock(&bo->base._resv));
194
195 r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
196 dma_resv_unlock(&bo->base._resv);
197 if (r)
198 return r;
199
200 if (bo->type != ttm_bo_type_sg) {
201 /* This works because the BO is about to be destroyed and nobody
202 * reference it any more. The only tricky case is the trylock on
203 * the resv object while holding the lru_lock.
204 */
205 spin_lock(&bo->bdev->lru_lock);
206 bo->base.resv = &bo->base._resv;
207 spin_unlock(&bo->bdev->lru_lock);
208 }
209
210 return r;
211}
212
213static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
214{
215 struct dma_resv *resv = &bo->base._resv;
216 struct dma_resv_iter cursor;
217 struct dma_fence *fence;
218
219 dma_resv_iter_begin(&cursor, resv, DMA_RESV_USAGE_BOOKKEEP);
220 dma_resv_for_each_fence_unlocked(&cursor, fence) {
221 if (!fence->ops->signaled)
222 dma_fence_enable_sw_signaling(fence);
223 }
224 dma_resv_iter_end(&cursor);
225}
226
227/*
228 * Block for the dma_resv object to become idle, lock the buffer and clean up
229 * the resource and tt object.
230 */
231static void ttm_bo_delayed_delete(struct work_struct *work)
232{
233 struct ttm_buffer_object *bo;
234
235 bo = container_of(work, typeof(*bo), delayed_delete);
236
237 dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP, false,
238 MAX_SCHEDULE_TIMEOUT);
239 dma_resv_lock(bo->base.resv, NULL);
240 ttm_bo_cleanup_memtype_use(bo);
241 dma_resv_unlock(bo->base.resv);
242 ttm_bo_put(bo);
243}
244
245static void ttm_bo_release(struct kref *kref)
246{
247 struct ttm_buffer_object *bo =
248 container_of(kref, struct ttm_buffer_object, kref);
249 struct ttm_device *bdev = bo->bdev;
250 int ret;
251
252 WARN_ON_ONCE(bo->pin_count);
253 WARN_ON_ONCE(bo->bulk_move);
254
255 if (!bo->deleted) {
256 ret = ttm_bo_individualize_resv(bo);
257 if (ret) {
258 /* Last resort, if we fail to allocate memory for the
259 * fences block for the BO to become idle
260 */
261 dma_resv_wait_timeout(bo->base.resv,
262 DMA_RESV_USAGE_BOOKKEEP, false,
263 30 * HZ);
264 }
265
266 if (bo->bdev->funcs->release_notify)
267 bo->bdev->funcs->release_notify(bo);
268
269 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
270 ttm_mem_io_free(bdev, bo->resource);
271
272 if (!dma_resv_test_signaled(bo->base.resv,
273 DMA_RESV_USAGE_BOOKKEEP) ||
274 (want_init_on_free() && (bo->ttm != NULL)) ||
275 bo->type == ttm_bo_type_sg ||
276 !dma_resv_trylock(bo->base.resv)) {
277 /* The BO is not idle, resurrect it for delayed destroy */
278 ttm_bo_flush_all_fences(bo);
279 bo->deleted = true;
280
281 spin_lock(&bo->bdev->lru_lock);
282
283 /*
284 * Make pinned bos immediately available to
285 * shrinkers, now that they are queued for
286 * destruction.
287 *
288 * FIXME: QXL is triggering this. Can be removed when the
289 * driver is fixed.
290 */
291 if (bo->pin_count) {
292 bo->pin_count = 0;
293 ttm_resource_move_to_lru_tail(bo->resource);
294 }
295
296 kref_init(&bo->kref);
297 spin_unlock(&bo->bdev->lru_lock);
298
299 INIT_WORK(&bo->delayed_delete, ttm_bo_delayed_delete);
300
301 /* Schedule the worker on the closest NUMA node. This
302 * improves performance since system memory might be
303 * cleared on free and that is best done on a CPU core
304 * close to it.
305 */
306 queue_work_node(bdev->pool.nid, bdev->wq, &bo->delayed_delete);
307 return;
308 }
309
310 ttm_bo_cleanup_memtype_use(bo);
311 dma_resv_unlock(bo->base.resv);
312 }
313
314 atomic_dec(&ttm_glob.bo_count);
315 bo->destroy(bo);
316}
317
318/**
319 * ttm_bo_put
320 *
321 * @bo: The buffer object.
322 *
323 * Unreference a buffer object.
324 */
325void ttm_bo_put(struct ttm_buffer_object *bo)
326{
327 kref_put(&bo->kref, ttm_bo_release);
328}
329EXPORT_SYMBOL(ttm_bo_put);
330
331static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
332 struct ttm_operation_ctx *ctx,
333 struct ttm_place *hop)
334{
335 struct ttm_placement hop_placement;
336 struct ttm_resource *hop_mem;
337 int ret;
338
339 hop_placement.num_placement = 1;
340 hop_placement.placement = hop;
341
342 /* find space in the bounce domain */
343 ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
344 if (ret)
345 return ret;
346 /* move to the bounce domain */
347 ret = ttm_bo_handle_move_mem(bo, hop_mem, false, ctx, NULL);
348 if (ret) {
349 ttm_resource_free(bo, &hop_mem);
350 return ret;
351 }
352 return 0;
353}
354
355static int ttm_bo_evict(struct ttm_buffer_object *bo,
356 struct ttm_operation_ctx *ctx)
357{
358 struct ttm_device *bdev = bo->bdev;
359 struct ttm_resource *evict_mem;
360 struct ttm_placement placement;
361 struct ttm_place hop;
362 int ret = 0;
363
364 memset(&hop, 0, sizeof(hop));
365
366 dma_resv_assert_held(bo->base.resv);
367
368 placement.num_placement = 0;
369 bdev->funcs->evict_flags(bo, &placement);
370
371 if (!placement.num_placement) {
372 ret = ttm_bo_wait_ctx(bo, ctx);
373 if (ret)
374 return ret;
375
376 /*
377 * Since we've already synced, this frees backing store
378 * immediately.
379 */
380 return ttm_bo_pipeline_gutting(bo);
381 }
382
383 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
384 if (ret) {
385 if (ret != -ERESTARTSYS) {
386 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
387 bo);
388 ttm_bo_mem_space_debug(bo, &placement);
389 }
390 goto out;
391 }
392
393 do {
394 ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
395 if (ret != -EMULTIHOP)
396 break;
397
398 ret = ttm_bo_bounce_temp_buffer(bo, ctx, &hop);
399 } while (!ret);
400
401 if (ret) {
402 ttm_resource_free(bo, &evict_mem);
403 if (ret != -ERESTARTSYS && ret != -EINTR)
404 pr_err("Buffer eviction failed\n");
405 }
406out:
407 return ret;
408}
409
410/**
411 * ttm_bo_eviction_valuable
412 *
413 * @bo: The buffer object to evict
414 * @place: the placement we need to make room for
415 *
416 * Check if it is valuable to evict the BO to make room for the given placement.
417 */
418bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
419 const struct ttm_place *place)
420{
421 struct ttm_resource *res = bo->resource;
422 struct ttm_device *bdev = bo->bdev;
423
424 dma_resv_assert_held(bo->base.resv);
425 if (bo->resource->mem_type == TTM_PL_SYSTEM)
426 return true;
427
428 /* Don't evict this BO if it's outside of the
429 * requested placement range
430 */
431 return ttm_resource_intersects(bdev, res, place, bo->base.size);
432}
433EXPORT_SYMBOL(ttm_bo_eviction_valuable);
434
435/**
436 * ttm_bo_evict_first() - Evict the first bo on the manager's LRU list.
437 * @bdev: The ttm device.
438 * @man: The manager whose bo to evict.
439 * @ctx: The TTM operation ctx governing the eviction.
440 *
441 * Return: 0 if successful or the resource disappeared. Negative error code on error.
442 */
443int ttm_bo_evict_first(struct ttm_device *bdev, struct ttm_resource_manager *man,
444 struct ttm_operation_ctx *ctx)
445{
446 struct ttm_resource_cursor cursor;
447 struct ttm_buffer_object *bo;
448 struct ttm_resource *res;
449 unsigned int mem_type;
450 int ret = 0;
451
452 spin_lock(&bdev->lru_lock);
453 res = ttm_resource_manager_first(man, &cursor);
454 ttm_resource_cursor_fini(&cursor);
455 if (!res) {
456 ret = -ENOENT;
457 goto out_no_ref;
458 }
459 bo = res->bo;
460 if (!ttm_bo_get_unless_zero(bo))
461 goto out_no_ref;
462 mem_type = res->mem_type;
463 spin_unlock(&bdev->lru_lock);
464 ret = ttm_bo_reserve(bo, ctx->interruptible, ctx->no_wait_gpu, NULL);
465 if (ret)
466 goto out_no_lock;
467 if (!bo->resource || bo->resource->mem_type != mem_type)
468 goto out_bo_moved;
469
470 if (bo->deleted) {
471 ret = ttm_bo_wait_ctx(bo, ctx);
472 if (!ret)
473 ttm_bo_cleanup_memtype_use(bo);
474 } else {
475 ret = ttm_bo_evict(bo, ctx);
476 }
477out_bo_moved:
478 dma_resv_unlock(bo->base.resv);
479out_no_lock:
480 ttm_bo_put(bo);
481 return ret;
482
483out_no_ref:
484 spin_unlock(&bdev->lru_lock);
485 return ret;
486}
487
488/**
489 * struct ttm_bo_evict_walk - Parameters for the evict walk.
490 */
491struct ttm_bo_evict_walk {
492 /** @walk: The walk base parameters. */
493 struct ttm_lru_walk walk;
494 /** @place: The place passed to the resource allocation. */
495 const struct ttm_place *place;
496 /** @evictor: The buffer object we're trying to make room for. */
497 struct ttm_buffer_object *evictor;
498 /** @res: The allocated resource if any. */
499 struct ttm_resource **res;
500 /** @evicted: Number of successful evictions. */
501 unsigned long evicted;
502};
503
504static s64 ttm_bo_evict_cb(struct ttm_lru_walk *walk, struct ttm_buffer_object *bo)
505{
506 struct ttm_bo_evict_walk *evict_walk =
507 container_of(walk, typeof(*evict_walk), walk);
508 s64 lret;
509
510 if (bo->pin_count || !bo->bdev->funcs->eviction_valuable(bo, evict_walk->place))
511 return 0;
512
513 if (bo->deleted) {
514 lret = ttm_bo_wait_ctx(bo, walk->ctx);
515 if (!lret)
516 ttm_bo_cleanup_memtype_use(bo);
517 } else {
518 lret = ttm_bo_evict(bo, walk->ctx);
519 }
520
521 if (lret)
522 goto out;
523
524 evict_walk->evicted++;
525 if (evict_walk->res)
526 lret = ttm_resource_alloc(evict_walk->evictor, evict_walk->place,
527 evict_walk->res);
528 if (lret == 0)
529 return 1;
530out:
531 /* Errors that should terminate the walk. */
532 if (lret == -ENOSPC)
533 return -EBUSY;
534
535 return lret;
536}
537
538static const struct ttm_lru_walk_ops ttm_evict_walk_ops = {
539 .process_bo = ttm_bo_evict_cb,
540};
541
542static int ttm_bo_evict_alloc(struct ttm_device *bdev,
543 struct ttm_resource_manager *man,
544 const struct ttm_place *place,
545 struct ttm_buffer_object *evictor,
546 struct ttm_operation_ctx *ctx,
547 struct ww_acquire_ctx *ticket,
548 struct ttm_resource **res)
549{
550 struct ttm_bo_evict_walk evict_walk = {
551 .walk = {
552 .ops = &ttm_evict_walk_ops,
553 .ctx = ctx,
554 .ticket = ticket,
555 },
556 .place = place,
557 .evictor = evictor,
558 .res = res,
559 };
560 s64 lret;
561
562 evict_walk.walk.trylock_only = true;
563 lret = ttm_lru_walk_for_evict(&evict_walk.walk, bdev, man, 1);
564 if (lret || !ticket)
565 goto out;
566
567 /* If ticket-locking, repeat while making progress. */
568 evict_walk.walk.trylock_only = false;
569 do {
570 /* The walk may clear the evict_walk.walk.ticket field */
571 evict_walk.walk.ticket = ticket;
572 evict_walk.evicted = 0;
573 lret = ttm_lru_walk_for_evict(&evict_walk.walk, bdev, man, 1);
574 } while (!lret && evict_walk.evicted);
575out:
576 if (lret < 0)
577 return lret;
578 if (lret == 0)
579 return -EBUSY;
580 return 0;
581}
582
583/**
584 * ttm_bo_pin - Pin the buffer object.
585 * @bo: The buffer object to pin
586 *
587 * Make sure the buffer is not evicted any more during memory pressure.
588 * @bo must be unpinned again by calling ttm_bo_unpin().
589 */
590void ttm_bo_pin(struct ttm_buffer_object *bo)
591{
592 dma_resv_assert_held(bo->base.resv);
593 WARN_ON_ONCE(!kref_read(&bo->kref));
594 spin_lock(&bo->bdev->lru_lock);
595 if (bo->resource)
596 ttm_resource_del_bulk_move(bo->resource, bo);
597 if (!bo->pin_count++ && bo->resource)
598 ttm_resource_move_to_lru_tail(bo->resource);
599 spin_unlock(&bo->bdev->lru_lock);
600}
601EXPORT_SYMBOL(ttm_bo_pin);
602
603/**
604 * ttm_bo_unpin - Unpin the buffer object.
605 * @bo: The buffer object to unpin
606 *
607 * Allows the buffer object to be evicted again during memory pressure.
608 */
609void ttm_bo_unpin(struct ttm_buffer_object *bo)
610{
611 dma_resv_assert_held(bo->base.resv);
612 WARN_ON_ONCE(!kref_read(&bo->kref));
613 if (WARN_ON_ONCE(!bo->pin_count))
614 return;
615
616 spin_lock(&bo->bdev->lru_lock);
617 if (!--bo->pin_count && bo->resource) {
618 ttm_resource_add_bulk_move(bo->resource, bo);
619 ttm_resource_move_to_lru_tail(bo->resource);
620 }
621 spin_unlock(&bo->bdev->lru_lock);
622}
623EXPORT_SYMBOL(ttm_bo_unpin);
624
625/*
626 * Add the last move fence to the BO as kernel dependency and reserve a new
627 * fence slot.
628 */
629static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
630 struct ttm_resource_manager *man,
631 bool no_wait_gpu)
632{
633 struct dma_fence *fence;
634 int ret;
635
636 spin_lock(&man->move_lock);
637 fence = dma_fence_get(man->move);
638 spin_unlock(&man->move_lock);
639
640 if (!fence)
641 return 0;
642
643 if (no_wait_gpu) {
644 ret = dma_fence_is_signaled(fence) ? 0 : -EBUSY;
645 dma_fence_put(fence);
646 return ret;
647 }
648
649 dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_KERNEL);
650
651 ret = dma_resv_reserve_fences(bo->base.resv, 1);
652 dma_fence_put(fence);
653 return ret;
654}
655
656/**
657 * ttm_bo_alloc_resource - Allocate backing store for a BO
658 *
659 * @bo: Pointer to a struct ttm_buffer_object of which we want a resource for
660 * @placement: Proposed new placement for the buffer object
661 * @ctx: if and how to sleep, lock buffers and alloc memory
662 * @force_space: If we should evict buffers to force space
663 * @res: The resulting struct ttm_resource.
664 *
665 * Allocates a resource for the buffer object pointed to by @bo, using the
666 * placement flags in @placement, potentially evicting other buffer objects when
667 * @force_space is true.
668 * This function may sleep while waiting for resources to become available.
669 * Returns:
670 * -EBUSY: No space available (only if no_wait == true).
671 * -ENOSPC: Could not allocate space for the buffer object, either due to
672 * fragmentation or concurrent allocators.
673 * -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
674 */
675static int ttm_bo_alloc_resource(struct ttm_buffer_object *bo,
676 struct ttm_placement *placement,
677 struct ttm_operation_ctx *ctx,
678 bool force_space,
679 struct ttm_resource **res)
680{
681 struct ttm_device *bdev = bo->bdev;
682 struct ww_acquire_ctx *ticket;
683 int i, ret;
684
685 ticket = dma_resv_locking_ctx(bo->base.resv);
686 ret = dma_resv_reserve_fences(bo->base.resv, 1);
687 if (unlikely(ret))
688 return ret;
689
690 for (i = 0; i < placement->num_placement; ++i) {
691 const struct ttm_place *place = &placement->placement[i];
692 struct ttm_resource_manager *man;
693 bool may_evict;
694
695 man = ttm_manager_type(bdev, place->mem_type);
696 if (!man || !ttm_resource_manager_used(man))
697 continue;
698
699 if (place->flags & (force_space ? TTM_PL_FLAG_DESIRED :
700 TTM_PL_FLAG_FALLBACK))
701 continue;
702
703 may_evict = (force_space && place->mem_type != TTM_PL_SYSTEM);
704 ret = ttm_resource_alloc(bo, place, res);
705 if (ret) {
706 if (ret != -ENOSPC)
707 return ret;
708 if (!may_evict)
709 continue;
710
711 ret = ttm_bo_evict_alloc(bdev, man, place, bo, ctx,
712 ticket, res);
713 if (ret == -EBUSY)
714 continue;
715 if (ret)
716 return ret;
717 }
718
719 ret = ttm_bo_add_move_fence(bo, man, ctx->no_wait_gpu);
720 if (unlikely(ret)) {
721 ttm_resource_free(bo, res);
722 if (ret == -EBUSY)
723 continue;
724
725 return ret;
726 }
727 return 0;
728 }
729
730 return -ENOSPC;
731}
732
733/*
734 * ttm_bo_mem_space - Wrapper around ttm_bo_alloc_resource
735 *
736 * @bo: Pointer to a struct ttm_buffer_object of which we want a resource for
737 * @placement: Proposed new placement for the buffer object
738 * @res: The resulting struct ttm_resource.
739 * @ctx: if and how to sleep, lock buffers and alloc memory
740 *
741 * Tries both idle allocation and forcefully eviction of buffers. See
742 * ttm_bo_alloc_resource for details.
743 */
744int ttm_bo_mem_space(struct ttm_buffer_object *bo,
745 struct ttm_placement *placement,
746 struct ttm_resource **res,
747 struct ttm_operation_ctx *ctx)
748{
749 bool force_space = false;
750 int ret;
751
752 do {
753 ret = ttm_bo_alloc_resource(bo, placement, ctx,
754 force_space, res);
755 force_space = !force_space;
756 } while (ret == -ENOSPC && force_space);
757
758 return ret;
759}
760EXPORT_SYMBOL(ttm_bo_mem_space);
761
762/**
763 * ttm_bo_validate
764 *
765 * @bo: The buffer object.
766 * @placement: Proposed placement for the buffer object.
767 * @ctx: validation parameters.
768 *
769 * Changes placement and caching policy of the buffer object
770 * according proposed placement.
771 * Returns
772 * -EINVAL on invalid proposed placement.
773 * -ENOMEM on out-of-memory condition.
774 * -EBUSY if no_wait is true and buffer busy.
775 * -ERESTARTSYS if interrupted by a signal.
776 */
777int ttm_bo_validate(struct ttm_buffer_object *bo,
778 struct ttm_placement *placement,
779 struct ttm_operation_ctx *ctx)
780{
781 struct ttm_resource *res;
782 struct ttm_place hop;
783 bool force_space;
784 int ret;
785
786 dma_resv_assert_held(bo->base.resv);
787
788 /*
789 * Remove the backing store if no placement is given.
790 */
791 if (!placement->num_placement)
792 return ttm_bo_pipeline_gutting(bo);
793
794 force_space = false;
795 do {
796 /* Check whether we need to move buffer. */
797 if (bo->resource &&
798 ttm_resource_compatible(bo->resource, placement,
799 force_space))
800 return 0;
801
802 /* Moving of pinned BOs is forbidden */
803 if (bo->pin_count)
804 return -EINVAL;
805
806 /*
807 * Determine where to move the buffer.
808 *
809 * If driver determines move is going to need
810 * an extra step then it will return -EMULTIHOP
811 * and the buffer will be moved to the temporary
812 * stop and the driver will be called to make
813 * the second hop.
814 */
815 ret = ttm_bo_alloc_resource(bo, placement, ctx, force_space,
816 &res);
817 force_space = !force_space;
818 if (ret == -ENOSPC)
819 continue;
820 if (ret)
821 return ret;
822
823bounce:
824 ret = ttm_bo_handle_move_mem(bo, res, false, ctx, &hop);
825 if (ret == -EMULTIHOP) {
826 ret = ttm_bo_bounce_temp_buffer(bo, ctx, &hop);
827 /* try and move to final place now. */
828 if (!ret)
829 goto bounce;
830 }
831 if (ret) {
832 ttm_resource_free(bo, &res);
833 return ret;
834 }
835
836 } while (ret && force_space);
837
838 /* For backward compatibility with userspace */
839 if (ret == -ENOSPC)
840 return -ENOMEM;
841
842 /*
843 * We might need to add a TTM.
844 */
845 if (!bo->resource || bo->resource->mem_type == TTM_PL_SYSTEM) {
846 ret = ttm_tt_create(bo, true);
847 if (ret)
848 return ret;
849 }
850 return 0;
851}
852EXPORT_SYMBOL(ttm_bo_validate);
853
854/**
855 * ttm_bo_init_reserved
856 *
857 * @bdev: Pointer to a ttm_device struct.
858 * @bo: Pointer to a ttm_buffer_object to be initialized.
859 * @type: Requested type of buffer object.
860 * @placement: Initial placement for buffer object.
861 * @alignment: Data alignment in pages.
862 * @ctx: TTM operation context for memory allocation.
863 * @sg: Scatter-gather table.
864 * @resv: Pointer to a dma_resv, or NULL to let ttm allocate one.
865 * @destroy: Destroy function. Use NULL for kfree().
866 *
867 * This function initializes a pre-allocated struct ttm_buffer_object.
868 * As this object may be part of a larger structure, this function,
869 * together with the @destroy function, enables driver-specific objects
870 * derived from a ttm_buffer_object.
871 *
872 * On successful return, the caller owns an object kref to @bo. The kref and
873 * list_kref are usually set to 1, but note that in some situations, other
874 * tasks may already be holding references to @bo as well.
875 * Furthermore, if resv == NULL, the buffer's reservation lock will be held,
876 * and it is the caller's responsibility to call ttm_bo_unreserve.
877 *
878 * If a failure occurs, the function will call the @destroy function. Thus,
879 * after a failure, dereferencing @bo is illegal and will likely cause memory
880 * corruption.
881 *
882 * Returns
883 * -ENOMEM: Out of memory.
884 * -EINVAL: Invalid placement flags.
885 * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
886 */
887int ttm_bo_init_reserved(struct ttm_device *bdev, struct ttm_buffer_object *bo,
888 enum ttm_bo_type type, struct ttm_placement *placement,
889 uint32_t alignment, struct ttm_operation_ctx *ctx,
890 struct sg_table *sg, struct dma_resv *resv,
891 void (*destroy) (struct ttm_buffer_object *))
892{
893 int ret;
894
895 kref_init(&bo->kref);
896 bo->bdev = bdev;
897 bo->type = type;
898 bo->page_alignment = alignment;
899 bo->destroy = destroy;
900 bo->pin_count = 0;
901 bo->sg = sg;
902 bo->bulk_move = NULL;
903 if (resv)
904 bo->base.resv = resv;
905 else
906 bo->base.resv = &bo->base._resv;
907 atomic_inc(&ttm_glob.bo_count);
908
909 /*
910 * For ttm_bo_type_device buffers, allocate
911 * address space from the device.
912 */
913 if (bo->type == ttm_bo_type_device || bo->type == ttm_bo_type_sg) {
914 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
915 PFN_UP(bo->base.size));
916 if (ret)
917 goto err_put;
918 }
919
920 /* passed reservation objects should already be locked,
921 * since otherwise lockdep will be angered in radeon.
922 */
923 if (!resv)
924 WARN_ON(!dma_resv_trylock(bo->base.resv));
925 else
926 dma_resv_assert_held(resv);
927
928 ret = ttm_bo_validate(bo, placement, ctx);
929 if (unlikely(ret))
930 goto err_unlock;
931
932 return 0;
933
934err_unlock:
935 if (!resv)
936 dma_resv_unlock(bo->base.resv);
937
938err_put:
939 ttm_bo_put(bo);
940 return ret;
941}
942EXPORT_SYMBOL(ttm_bo_init_reserved);
943
944/**
945 * ttm_bo_init_validate
946 *
947 * @bdev: Pointer to a ttm_device struct.
948 * @bo: Pointer to a ttm_buffer_object to be initialized.
949 * @type: Requested type of buffer object.
950 * @placement: Initial placement for buffer object.
951 * @alignment: Data alignment in pages.
952 * @interruptible: If needing to sleep to wait for GPU resources,
953 * sleep interruptible.
954 * pinned in physical memory. If this behaviour is not desired, this member
955 * holds a pointer to a persistent shmem object. Typically, this would
956 * point to the shmem object backing a GEM object if TTM is used to back a
957 * GEM user interface.
958 * @sg: Scatter-gather table.
959 * @resv: Pointer to a dma_resv, or NULL to let ttm allocate one.
960 * @destroy: Destroy function. Use NULL for kfree().
961 *
962 * This function initializes a pre-allocated struct ttm_buffer_object.
963 * As this object may be part of a larger structure, this function,
964 * together with the @destroy function,
965 * enables driver-specific objects derived from a ttm_buffer_object.
966 *
967 * On successful return, the caller owns an object kref to @bo. The kref and
968 * list_kref are usually set to 1, but note that in some situations, other
969 * tasks may already be holding references to @bo as well.
970 *
971 * If a failure occurs, the function will call the @destroy function, Thus,
972 * after a failure, dereferencing @bo is illegal and will likely cause memory
973 * corruption.
974 *
975 * Returns
976 * -ENOMEM: Out of memory.
977 * -EINVAL: Invalid placement flags.
978 * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
979 */
980int ttm_bo_init_validate(struct ttm_device *bdev, struct ttm_buffer_object *bo,
981 enum ttm_bo_type type, struct ttm_placement *placement,
982 uint32_t alignment, bool interruptible,
983 struct sg_table *sg, struct dma_resv *resv,
984 void (*destroy) (struct ttm_buffer_object *))
985{
986 struct ttm_operation_ctx ctx = { interruptible, false };
987 int ret;
988
989 ret = ttm_bo_init_reserved(bdev, bo, type, placement, alignment, &ctx,
990 sg, resv, destroy);
991 if (ret)
992 return ret;
993
994 if (!resv)
995 ttm_bo_unreserve(bo);
996
997 return 0;
998}
999EXPORT_SYMBOL(ttm_bo_init_validate);
1000
1001/*
1002 * buffer object vm functions.
1003 */
1004
1005/**
1006 * ttm_bo_unmap_virtual
1007 *
1008 * @bo: tear down the virtual mappings for this BO
1009 */
1010void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1011{
1012 struct ttm_device *bdev = bo->bdev;
1013
1014 drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1015 ttm_mem_io_free(bdev, bo->resource);
1016}
1017EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1018
1019/**
1020 * ttm_bo_wait_ctx - wait for buffer idle.
1021 *
1022 * @bo: The buffer object.
1023 * @ctx: defines how to wait
1024 *
1025 * Waits for the buffer to be idle. Used timeout depends on the context.
1026 * Returns -EBUSY if wait timed outt, -ERESTARTSYS if interrupted by a signal or
1027 * zero on success.
1028 */
1029int ttm_bo_wait_ctx(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx)
1030{
1031 long ret;
1032
1033 if (ctx->no_wait_gpu) {
1034 if (dma_resv_test_signaled(bo->base.resv,
1035 DMA_RESV_USAGE_BOOKKEEP))
1036 return 0;
1037 else
1038 return -EBUSY;
1039 }
1040
1041 ret = dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP,
1042 ctx->interruptible, 15 * HZ);
1043 if (unlikely(ret < 0))
1044 return ret;
1045 if (unlikely(ret == 0))
1046 return -EBUSY;
1047 return 0;
1048}
1049EXPORT_SYMBOL(ttm_bo_wait_ctx);
1050
1051/**
1052 * struct ttm_bo_swapout_walk - Parameters for the swapout walk
1053 */
1054struct ttm_bo_swapout_walk {
1055 /** @walk: The walk base parameters. */
1056 struct ttm_lru_walk walk;
1057 /** @gfp_flags: The gfp flags to use for ttm_tt_swapout() */
1058 gfp_t gfp_flags;
1059};
1060
1061static s64
1062ttm_bo_swapout_cb(struct ttm_lru_walk *walk, struct ttm_buffer_object *bo)
1063{
1064 struct ttm_place place = {.mem_type = bo->resource->mem_type};
1065 struct ttm_bo_swapout_walk *swapout_walk =
1066 container_of(walk, typeof(*swapout_walk), walk);
1067 struct ttm_operation_ctx *ctx = walk->ctx;
1068 s64 ret;
1069
1070 /*
1071 * While the bo may already reside in SYSTEM placement, set
1072 * SYSTEM as new placement to cover also the move further below.
1073 * The driver may use the fact that we're moving from SYSTEM
1074 * as an indication that we're about to swap out.
1075 */
1076 if (bo->pin_count || !bo->bdev->funcs->eviction_valuable(bo, &place)) {
1077 ret = -EBUSY;
1078 goto out;
1079 }
1080
1081 if (!bo->ttm || !ttm_tt_is_populated(bo->ttm) ||
1082 bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL ||
1083 bo->ttm->page_flags & TTM_TT_FLAG_SWAPPED) {
1084 ret = -EBUSY;
1085 goto out;
1086 }
1087
1088 if (bo->deleted) {
1089 pgoff_t num_pages = bo->ttm->num_pages;
1090
1091 ret = ttm_bo_wait_ctx(bo, ctx);
1092 if (ret)
1093 goto out;
1094
1095 ttm_bo_cleanup_memtype_use(bo);
1096 ret = num_pages;
1097 goto out;
1098 }
1099
1100 /*
1101 * Move to system cached
1102 */
1103 if (bo->resource->mem_type != TTM_PL_SYSTEM) {
1104 struct ttm_resource *evict_mem;
1105 struct ttm_place hop;
1106
1107 memset(&hop, 0, sizeof(hop));
1108 place.mem_type = TTM_PL_SYSTEM;
1109 ret = ttm_resource_alloc(bo, &place, &evict_mem);
1110 if (ret)
1111 goto out;
1112
1113 ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
1114 if (ret) {
1115 WARN(ret == -EMULTIHOP,
1116 "Unexpected multihop in swapout - likely driver bug.\n");
1117 ttm_resource_free(bo, &evict_mem);
1118 goto out;
1119 }
1120 }
1121
1122 /*
1123 * Make sure BO is idle.
1124 */
1125 ret = ttm_bo_wait_ctx(bo, ctx);
1126 if (ret)
1127 goto out;
1128
1129 ttm_bo_unmap_virtual(bo);
1130 if (bo->bdev->funcs->swap_notify)
1131 bo->bdev->funcs->swap_notify(bo);
1132
1133 if (ttm_tt_is_populated(bo->ttm)) {
1134 spin_lock(&bo->bdev->lru_lock);
1135 ttm_resource_del_bulk_move(bo->resource, bo);
1136 spin_unlock(&bo->bdev->lru_lock);
1137
1138 ret = ttm_tt_swapout(bo->bdev, bo->ttm, swapout_walk->gfp_flags);
1139
1140 spin_lock(&bo->bdev->lru_lock);
1141 if (ret)
1142 ttm_resource_add_bulk_move(bo->resource, bo);
1143 ttm_resource_move_to_lru_tail(bo->resource);
1144 spin_unlock(&bo->bdev->lru_lock);
1145 }
1146
1147out:
1148 /* Consider -ENOMEM and -ENOSPC non-fatal. */
1149 if (ret == -ENOMEM || ret == -ENOSPC)
1150 ret = -EBUSY;
1151
1152 return ret;
1153}
1154
1155const struct ttm_lru_walk_ops ttm_swap_ops = {
1156 .process_bo = ttm_bo_swapout_cb,
1157};
1158
1159/**
1160 * ttm_bo_swapout() - Swap out buffer objects on the LRU list to shmem.
1161 * @bdev: The ttm device.
1162 * @ctx: The ttm_operation_ctx governing the swapout operation.
1163 * @man: The resource manager whose resources / buffer objects are
1164 * goint to be swapped out.
1165 * @gfp_flags: The gfp flags used for shmem page allocations.
1166 * @target: The desired number of bytes to swap out.
1167 *
1168 * Return: The number of bytes actually swapped out, or negative error code
1169 * on error.
1170 */
1171s64 ttm_bo_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
1172 struct ttm_resource_manager *man, gfp_t gfp_flags,
1173 s64 target)
1174{
1175 struct ttm_bo_swapout_walk swapout_walk = {
1176 .walk = {
1177 .ops = &ttm_swap_ops,
1178 .ctx = ctx,
1179 .trylock_only = true,
1180 },
1181 .gfp_flags = gfp_flags,
1182 };
1183
1184 return ttm_lru_walk_for_evict(&swapout_walk.walk, bdev, man, target);
1185}
1186
1187void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
1188{
1189 if (bo->ttm == NULL)
1190 return;
1191
1192 ttm_tt_unpopulate(bo->bdev, bo->ttm);
1193 ttm_tt_destroy(bo->bdev, bo->ttm);
1194 bo->ttm = NULL;
1195}
1196
1197/**
1198 * ttm_bo_populate() - Ensure that a buffer object has backing pages
1199 * @bo: The buffer object
1200 * @ctx: The ttm_operation_ctx governing the operation.
1201 *
1202 * For buffer objects in a memory type whose manager uses
1203 * struct ttm_tt for backing pages, ensure those backing pages
1204 * are present and with valid content. The bo's resource is also
1205 * placed on the correct LRU list if it was previously swapped
1206 * out.
1207 *
1208 * Return: 0 if successful, negative error code on failure.
1209 * Note: May return -EINTR or -ERESTARTSYS if @ctx::interruptible
1210 * is set to true.
1211 */
1212int ttm_bo_populate(struct ttm_buffer_object *bo,
1213 struct ttm_operation_ctx *ctx)
1214{
1215 struct ttm_tt *tt = bo->ttm;
1216 bool swapped;
1217 int ret;
1218
1219 dma_resv_assert_held(bo->base.resv);
1220
1221 if (!tt)
1222 return 0;
1223
1224 swapped = ttm_tt_is_swapped(tt);
1225 ret = ttm_tt_populate(bo->bdev, tt, ctx);
1226 if (ret)
1227 return ret;
1228
1229 if (swapped && !ttm_tt_is_swapped(tt) && !bo->pin_count &&
1230 bo->resource) {
1231 spin_lock(&bo->bdev->lru_lock);
1232 ttm_resource_add_bulk_move(bo->resource, bo);
1233 ttm_resource_move_to_lru_tail(bo->resource);
1234 spin_unlock(&bo->bdev->lru_lock);
1235 }
1236
1237 return 0;
1238}
1239EXPORT_SYMBOL(ttm_bo_populate);
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <drm/ttm/ttm_module.h>
35#include <drm/ttm/ttm_bo_driver.h>
36#include <drm/ttm/ttm_placement.h>
37#include <linux/jiffies.h>
38#include <linux/slab.h>
39#include <linux/sched.h>
40#include <linux/mm.h>
41#include <linux/file.h>
42#include <linux/module.h>
43#include <linux/atomic.h>
44#include <linux/dma-resv.h>
45
46static void ttm_bo_global_kobj_release(struct kobject *kobj);
47
48/**
49 * ttm_global_mutex - protecting the global BO state
50 */
51DEFINE_MUTEX(ttm_global_mutex);
52unsigned ttm_bo_glob_use_count;
53struct ttm_bo_global ttm_bo_glob;
54
55static struct attribute ttm_bo_count = {
56 .name = "bo_count",
57 .mode = S_IRUGO
58};
59
60/* default destructor */
61static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
62{
63 kfree(bo);
64}
65
66static inline int ttm_mem_type_from_place(const struct ttm_place *place,
67 uint32_t *mem_type)
68{
69 int pos;
70
71 pos = ffs(place->flags & TTM_PL_MASK_MEM);
72 if (unlikely(!pos))
73 return -EINVAL;
74
75 *mem_type = pos - 1;
76 return 0;
77}
78
79static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
80 int mem_type)
81{
82 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
83
84 drm_printf(p, " has_type: %d\n", man->has_type);
85 drm_printf(p, " use_type: %d\n", man->use_type);
86 drm_printf(p, " flags: 0x%08X\n", man->flags);
87 drm_printf(p, " gpu_offset: 0x%08llX\n", man->gpu_offset);
88 drm_printf(p, " size: %llu\n", man->size);
89 drm_printf(p, " available_caching: 0x%08X\n", man->available_caching);
90 drm_printf(p, " default_caching: 0x%08X\n", man->default_caching);
91 if (mem_type != TTM_PL_SYSTEM)
92 (*man->func->debug)(man, p);
93}
94
95static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
96 struct ttm_placement *placement)
97{
98 struct drm_printer p = drm_debug_printer(TTM_PFX);
99 int i, ret, mem_type;
100
101 drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
102 bo, bo->mem.num_pages, bo->mem.size >> 10,
103 bo->mem.size >> 20);
104 for (i = 0; i < placement->num_placement; i++) {
105 ret = ttm_mem_type_from_place(&placement->placement[i],
106 &mem_type);
107 if (ret)
108 return;
109 drm_printf(&p, " placement[%d]=0x%08X (%d)\n",
110 i, placement->placement[i].flags, mem_type);
111 ttm_mem_type_debug(bo->bdev, &p, mem_type);
112 }
113}
114
115static ssize_t ttm_bo_global_show(struct kobject *kobj,
116 struct attribute *attr,
117 char *buffer)
118{
119 struct ttm_bo_global *glob =
120 container_of(kobj, struct ttm_bo_global, kobj);
121
122 return snprintf(buffer, PAGE_SIZE, "%d\n",
123 atomic_read(&glob->bo_count));
124}
125
126static struct attribute *ttm_bo_global_attrs[] = {
127 &ttm_bo_count,
128 NULL
129};
130
131static const struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
133};
134
135static struct kobj_type ttm_bo_glob_kobj_type = {
136 .release = &ttm_bo_global_kobj_release,
137 .sysfs_ops = &ttm_bo_global_ops,
138 .default_attrs = ttm_bo_global_attrs
139};
140
141
142static inline uint32_t ttm_bo_type_flags(unsigned type)
143{
144 return 1 << (type);
145}
146
147static void ttm_bo_release_list(struct kref *list_kref)
148{
149 struct ttm_buffer_object *bo =
150 container_of(list_kref, struct ttm_buffer_object, list_kref);
151 struct ttm_bo_device *bdev = bo->bdev;
152 size_t acc_size = bo->acc_size;
153
154 BUG_ON(kref_read(&bo->list_kref));
155 BUG_ON(kref_read(&bo->kref));
156 BUG_ON(atomic_read(&bo->cpu_writers));
157 BUG_ON(bo->mem.mm_node != NULL);
158 BUG_ON(!list_empty(&bo->lru));
159 BUG_ON(!list_empty(&bo->ddestroy));
160 ttm_tt_destroy(bo->ttm);
161 atomic_dec(&bo->bdev->glob->bo_count);
162 dma_fence_put(bo->moving);
163 if (!ttm_bo_uses_embedded_gem_object(bo))
164 dma_resv_fini(&bo->base._resv);
165 mutex_destroy(&bo->wu_mutex);
166 bo->destroy(bo);
167 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
168}
169
170static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
171 struct ttm_mem_reg *mem)
172{
173 struct ttm_bo_device *bdev = bo->bdev;
174 struct ttm_mem_type_manager *man;
175
176 dma_resv_assert_held(bo->base.resv);
177
178 if (!list_empty(&bo->lru))
179 return;
180
181 if (mem->placement & TTM_PL_FLAG_NO_EVICT)
182 return;
183
184 man = &bdev->man[mem->mem_type];
185 list_add_tail(&bo->lru, &man->lru[bo->priority]);
186 kref_get(&bo->list_kref);
187
188 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm &&
189 !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
190 TTM_PAGE_FLAG_SWAPPED))) {
191 list_add_tail(&bo->swap, &bdev->glob->swap_lru[bo->priority]);
192 kref_get(&bo->list_kref);
193 }
194}
195
196void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
197{
198 ttm_bo_add_mem_to_lru(bo, &bo->mem);
199}
200EXPORT_SYMBOL(ttm_bo_add_to_lru);
201
202static void ttm_bo_ref_bug(struct kref *list_kref)
203{
204 BUG();
205}
206
207void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
208{
209 struct ttm_bo_device *bdev = bo->bdev;
210 bool notify = false;
211
212 if (!list_empty(&bo->swap)) {
213 list_del_init(&bo->swap);
214 kref_put(&bo->list_kref, ttm_bo_ref_bug);
215 notify = true;
216 }
217 if (!list_empty(&bo->lru)) {
218 list_del_init(&bo->lru);
219 kref_put(&bo->list_kref, ttm_bo_ref_bug);
220 notify = true;
221 }
222
223 if (notify && bdev->driver->del_from_lru_notify)
224 bdev->driver->del_from_lru_notify(bo);
225}
226
227void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
228{
229 struct ttm_bo_global *glob = bo->bdev->glob;
230
231 spin_lock(&glob->lru_lock);
232 ttm_bo_del_from_lru(bo);
233 spin_unlock(&glob->lru_lock);
234}
235EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
236
237static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
238 struct ttm_buffer_object *bo)
239{
240 if (!pos->first)
241 pos->first = bo;
242 pos->last = bo;
243}
244
245void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
246 struct ttm_lru_bulk_move *bulk)
247{
248 dma_resv_assert_held(bo->base.resv);
249
250 ttm_bo_del_from_lru(bo);
251 ttm_bo_add_to_lru(bo);
252
253 if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
254 switch (bo->mem.mem_type) {
255 case TTM_PL_TT:
256 ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
257 break;
258
259 case TTM_PL_VRAM:
260 ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
261 break;
262 }
263 if (bo->ttm && !(bo->ttm->page_flags &
264 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
265 ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
266 }
267}
268EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
269
270void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
271{
272 unsigned i;
273
274 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
275 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
276 struct ttm_mem_type_manager *man;
277
278 if (!pos->first)
279 continue;
280
281 dma_resv_assert_held(pos->first->base.resv);
282 dma_resv_assert_held(pos->last->base.resv);
283
284 man = &pos->first->bdev->man[TTM_PL_TT];
285 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
286 &pos->last->lru);
287 }
288
289 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
290 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
291 struct ttm_mem_type_manager *man;
292
293 if (!pos->first)
294 continue;
295
296 dma_resv_assert_held(pos->first->base.resv);
297 dma_resv_assert_held(pos->last->base.resv);
298
299 man = &pos->first->bdev->man[TTM_PL_VRAM];
300 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
301 &pos->last->lru);
302 }
303
304 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
305 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
306 struct list_head *lru;
307
308 if (!pos->first)
309 continue;
310
311 dma_resv_assert_held(pos->first->base.resv);
312 dma_resv_assert_held(pos->last->base.resv);
313
314 lru = &pos->first->bdev->glob->swap_lru[i];
315 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
316 }
317}
318EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
319
320static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
321 struct ttm_mem_reg *mem, bool evict,
322 struct ttm_operation_ctx *ctx)
323{
324 struct ttm_bo_device *bdev = bo->bdev;
325 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
326 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
327 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
328 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
329 int ret = 0;
330
331 if (old_is_pci || new_is_pci ||
332 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
333 ret = ttm_mem_io_lock(old_man, true);
334 if (unlikely(ret != 0))
335 goto out_err;
336 ttm_bo_unmap_virtual_locked(bo);
337 ttm_mem_io_unlock(old_man);
338 }
339
340 /*
341 * Create and bind a ttm if required.
342 */
343
344 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
345 if (bo->ttm == NULL) {
346 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
347 ret = ttm_tt_create(bo, zero);
348 if (ret)
349 goto out_err;
350 }
351
352 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
353 if (ret)
354 goto out_err;
355
356 if (mem->mem_type != TTM_PL_SYSTEM) {
357 ret = ttm_tt_bind(bo->ttm, mem, ctx);
358 if (ret)
359 goto out_err;
360 }
361
362 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
363 if (bdev->driver->move_notify)
364 bdev->driver->move_notify(bo, evict, mem);
365 bo->mem = *mem;
366 mem->mm_node = NULL;
367 goto moved;
368 }
369 }
370
371 if (bdev->driver->move_notify)
372 bdev->driver->move_notify(bo, evict, mem);
373
374 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
375 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
376 ret = ttm_bo_move_ttm(bo, ctx, mem);
377 else if (bdev->driver->move)
378 ret = bdev->driver->move(bo, evict, ctx, mem);
379 else
380 ret = ttm_bo_move_memcpy(bo, ctx, mem);
381
382 if (ret) {
383 if (bdev->driver->move_notify) {
384 swap(*mem, bo->mem);
385 bdev->driver->move_notify(bo, false, mem);
386 swap(*mem, bo->mem);
387 }
388
389 goto out_err;
390 }
391
392moved:
393 if (bo->evicted) {
394 if (bdev->driver->invalidate_caches) {
395 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
396 if (ret)
397 pr_err("Can not flush read caches\n");
398 }
399 bo->evicted = false;
400 }
401
402 if (bo->mem.mm_node)
403 bo->offset = (bo->mem.start << PAGE_SHIFT) +
404 bdev->man[bo->mem.mem_type].gpu_offset;
405 else
406 bo->offset = 0;
407
408 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
409 return 0;
410
411out_err:
412 new_man = &bdev->man[bo->mem.mem_type];
413 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
414 ttm_tt_destroy(bo->ttm);
415 bo->ttm = NULL;
416 }
417
418 return ret;
419}
420
421/**
422 * Call bo::reserved.
423 * Will release GPU memory type usage on destruction.
424 * This is the place to put in driver specific hooks to release
425 * driver private resources.
426 * Will release the bo::reserved lock.
427 */
428
429static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
430{
431 if (bo->bdev->driver->move_notify)
432 bo->bdev->driver->move_notify(bo, false, NULL);
433
434 ttm_tt_destroy(bo->ttm);
435 bo->ttm = NULL;
436 ttm_bo_mem_put(bo, &bo->mem);
437}
438
439static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
440{
441 int r;
442
443 if (bo->base.resv == &bo->base._resv)
444 return 0;
445
446 BUG_ON(!dma_resv_trylock(&bo->base._resv));
447
448 r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
449 if (r)
450 dma_resv_unlock(&bo->base._resv);
451
452 return r;
453}
454
455static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
456{
457 struct dma_resv_list *fobj;
458 struct dma_fence *fence;
459 int i;
460
461 fobj = dma_resv_get_list(&bo->base._resv);
462 fence = dma_resv_get_excl(&bo->base._resv);
463 if (fence && !fence->ops->signaled)
464 dma_fence_enable_sw_signaling(fence);
465
466 for (i = 0; fobj && i < fobj->shared_count; ++i) {
467 fence = rcu_dereference_protected(fobj->shared[i],
468 dma_resv_held(bo->base.resv));
469
470 if (!fence->ops->signaled)
471 dma_fence_enable_sw_signaling(fence);
472 }
473}
474
475static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
476{
477 struct ttm_bo_device *bdev = bo->bdev;
478 struct ttm_bo_global *glob = bdev->glob;
479 int ret;
480
481 ret = ttm_bo_individualize_resv(bo);
482 if (ret) {
483 /* Last resort, if we fail to allocate memory for the
484 * fences block for the BO to become idle
485 */
486 dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
487 30 * HZ);
488 spin_lock(&glob->lru_lock);
489 goto error;
490 }
491
492 spin_lock(&glob->lru_lock);
493 ret = dma_resv_trylock(bo->base.resv) ? 0 : -EBUSY;
494 if (!ret) {
495 if (dma_resv_test_signaled_rcu(&bo->base._resv, true)) {
496 ttm_bo_del_from_lru(bo);
497 spin_unlock(&glob->lru_lock);
498 if (bo->base.resv != &bo->base._resv)
499 dma_resv_unlock(&bo->base._resv);
500
501 ttm_bo_cleanup_memtype_use(bo);
502 dma_resv_unlock(bo->base.resv);
503 return;
504 }
505
506 ttm_bo_flush_all_fences(bo);
507
508 /*
509 * Make NO_EVICT bos immediately available to
510 * shrinkers, now that they are queued for
511 * destruction.
512 */
513 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
514 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
515 ttm_bo_add_to_lru(bo);
516 }
517
518 dma_resv_unlock(bo->base.resv);
519 }
520 if (bo->base.resv != &bo->base._resv)
521 dma_resv_unlock(&bo->base._resv);
522
523error:
524 kref_get(&bo->list_kref);
525 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
526 spin_unlock(&glob->lru_lock);
527
528 schedule_delayed_work(&bdev->wq,
529 ((HZ / 100) < 1) ? 1 : HZ / 100);
530}
531
532/**
533 * function ttm_bo_cleanup_refs
534 * If bo idle, remove from delayed- and lru lists, and unref.
535 * If not idle, do nothing.
536 *
537 * Must be called with lru_lock and reservation held, this function
538 * will drop the lru lock and optionally the reservation lock before returning.
539 *
540 * @interruptible Any sleeps should occur interruptibly.
541 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
542 * @unlock_resv Unlock the reservation lock as well.
543 */
544
545static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
546 bool interruptible, bool no_wait_gpu,
547 bool unlock_resv)
548{
549 struct ttm_bo_global *glob = bo->bdev->glob;
550 struct dma_resv *resv;
551 int ret;
552
553 if (unlikely(list_empty(&bo->ddestroy)))
554 resv = bo->base.resv;
555 else
556 resv = &bo->base._resv;
557
558 if (dma_resv_test_signaled_rcu(resv, true))
559 ret = 0;
560 else
561 ret = -EBUSY;
562
563 if (ret && !no_wait_gpu) {
564 long lret;
565
566 if (unlock_resv)
567 dma_resv_unlock(bo->base.resv);
568 spin_unlock(&glob->lru_lock);
569
570 lret = dma_resv_wait_timeout_rcu(resv, true,
571 interruptible,
572 30 * HZ);
573
574 if (lret < 0)
575 return lret;
576 else if (lret == 0)
577 return -EBUSY;
578
579 spin_lock(&glob->lru_lock);
580 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
581 /*
582 * We raced, and lost, someone else holds the reservation now,
583 * and is probably busy in ttm_bo_cleanup_memtype_use.
584 *
585 * Even if it's not the case, because we finished waiting any
586 * delayed destruction would succeed, so just return success
587 * here.
588 */
589 spin_unlock(&glob->lru_lock);
590 return 0;
591 }
592 ret = 0;
593 }
594
595 if (ret || unlikely(list_empty(&bo->ddestroy))) {
596 if (unlock_resv)
597 dma_resv_unlock(bo->base.resv);
598 spin_unlock(&glob->lru_lock);
599 return ret;
600 }
601
602 ttm_bo_del_from_lru(bo);
603 list_del_init(&bo->ddestroy);
604 kref_put(&bo->list_kref, ttm_bo_ref_bug);
605
606 spin_unlock(&glob->lru_lock);
607 ttm_bo_cleanup_memtype_use(bo);
608
609 if (unlock_resv)
610 dma_resv_unlock(bo->base.resv);
611
612 return 0;
613}
614
615/**
616 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
617 * encountered buffers.
618 */
619static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
620{
621 struct ttm_bo_global *glob = bdev->glob;
622 struct list_head removed;
623 bool empty;
624
625 INIT_LIST_HEAD(&removed);
626
627 spin_lock(&glob->lru_lock);
628 while (!list_empty(&bdev->ddestroy)) {
629 struct ttm_buffer_object *bo;
630
631 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
632 ddestroy);
633 kref_get(&bo->list_kref);
634 list_move_tail(&bo->ddestroy, &removed);
635
636 if (remove_all || bo->base.resv != &bo->base._resv) {
637 spin_unlock(&glob->lru_lock);
638 dma_resv_lock(bo->base.resv, NULL);
639
640 spin_lock(&glob->lru_lock);
641 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
642
643 } else if (dma_resv_trylock(bo->base.resv)) {
644 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
645 } else {
646 spin_unlock(&glob->lru_lock);
647 }
648
649 kref_put(&bo->list_kref, ttm_bo_release_list);
650 spin_lock(&glob->lru_lock);
651 }
652 list_splice_tail(&removed, &bdev->ddestroy);
653 empty = list_empty(&bdev->ddestroy);
654 spin_unlock(&glob->lru_lock);
655
656 return empty;
657}
658
659static void ttm_bo_delayed_workqueue(struct work_struct *work)
660{
661 struct ttm_bo_device *bdev =
662 container_of(work, struct ttm_bo_device, wq.work);
663
664 if (!ttm_bo_delayed_delete(bdev, false))
665 schedule_delayed_work(&bdev->wq,
666 ((HZ / 100) < 1) ? 1 : HZ / 100);
667}
668
669static void ttm_bo_release(struct kref *kref)
670{
671 struct ttm_buffer_object *bo =
672 container_of(kref, struct ttm_buffer_object, kref);
673 struct ttm_bo_device *bdev = bo->bdev;
674 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
675
676 if (bo->bdev->driver->release_notify)
677 bo->bdev->driver->release_notify(bo);
678
679 drm_vma_offset_remove(&bdev->vma_manager, &bo->base.vma_node);
680 ttm_mem_io_lock(man, false);
681 ttm_mem_io_free_vm(bo);
682 ttm_mem_io_unlock(man);
683 ttm_bo_cleanup_refs_or_queue(bo);
684 kref_put(&bo->list_kref, ttm_bo_release_list);
685}
686
687void ttm_bo_put(struct ttm_buffer_object *bo)
688{
689 kref_put(&bo->kref, ttm_bo_release);
690}
691EXPORT_SYMBOL(ttm_bo_put);
692
693int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
694{
695 return cancel_delayed_work_sync(&bdev->wq);
696}
697EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
698
699void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
700{
701 if (resched)
702 schedule_delayed_work(&bdev->wq,
703 ((HZ / 100) < 1) ? 1 : HZ / 100);
704}
705EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
706
707static int ttm_bo_evict(struct ttm_buffer_object *bo,
708 struct ttm_operation_ctx *ctx)
709{
710 struct ttm_bo_device *bdev = bo->bdev;
711 struct ttm_mem_reg evict_mem;
712 struct ttm_placement placement;
713 int ret = 0;
714
715 dma_resv_assert_held(bo->base.resv);
716
717 placement.num_placement = 0;
718 placement.num_busy_placement = 0;
719 bdev->driver->evict_flags(bo, &placement);
720
721 if (!placement.num_placement && !placement.num_busy_placement) {
722 ret = ttm_bo_pipeline_gutting(bo);
723 if (ret)
724 return ret;
725
726 return ttm_tt_create(bo, false);
727 }
728
729 evict_mem = bo->mem;
730 evict_mem.mm_node = NULL;
731 evict_mem.bus.io_reserved_vm = false;
732 evict_mem.bus.io_reserved_count = 0;
733
734 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
735 if (ret) {
736 if (ret != -ERESTARTSYS) {
737 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
738 bo);
739 ttm_bo_mem_space_debug(bo, &placement);
740 }
741 goto out;
742 }
743
744 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
745 if (unlikely(ret)) {
746 if (ret != -ERESTARTSYS)
747 pr_err("Buffer eviction failed\n");
748 ttm_bo_mem_put(bo, &evict_mem);
749 goto out;
750 }
751 bo->evicted = true;
752out:
753 return ret;
754}
755
756bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
757 const struct ttm_place *place)
758{
759 /* Don't evict this BO if it's outside of the
760 * requested placement range
761 */
762 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
763 (place->lpfn && place->lpfn <= bo->mem.start))
764 return false;
765
766 return true;
767}
768EXPORT_SYMBOL(ttm_bo_eviction_valuable);
769
770/**
771 * Check the target bo is allowable to be evicted or swapout, including cases:
772 *
773 * a. if share same reservation object with ctx->resv, have assumption
774 * reservation objects should already be locked, so not lock again and
775 * return true directly when either the opreation allow_reserved_eviction
776 * or the target bo already is in delayed free list;
777 *
778 * b. Otherwise, trylock it.
779 */
780static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
781 struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
782{
783 bool ret = false;
784
785 if (bo->base.resv == ctx->resv) {
786 dma_resv_assert_held(bo->base.resv);
787 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
788 || !list_empty(&bo->ddestroy))
789 ret = true;
790 *locked = false;
791 if (busy)
792 *busy = false;
793 } else {
794 ret = dma_resv_trylock(bo->base.resv);
795 *locked = ret;
796 if (busy)
797 *busy = !ret;
798 }
799
800 return ret;
801}
802
803/**
804 * ttm_mem_evict_wait_busy - wait for a busy BO to become available
805 *
806 * @busy_bo: BO which couldn't be locked with trylock
807 * @ctx: operation context
808 * @ticket: acquire ticket
809 *
810 * Try to lock a busy buffer object to avoid failing eviction.
811 */
812static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
813 struct ttm_operation_ctx *ctx,
814 struct ww_acquire_ctx *ticket)
815{
816 int r;
817
818 if (!busy_bo || !ticket)
819 return -EBUSY;
820
821 if (ctx->interruptible)
822 r = dma_resv_lock_interruptible(busy_bo->base.resv,
823 ticket);
824 else
825 r = dma_resv_lock(busy_bo->base.resv, ticket);
826
827 /*
828 * TODO: It would be better to keep the BO locked until allocation is at
829 * least tried one more time, but that would mean a much larger rework
830 * of TTM.
831 */
832 if (!r)
833 dma_resv_unlock(busy_bo->base.resv);
834
835 return r == -EDEADLK ? -EBUSY : r;
836}
837
838static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
839 uint32_t mem_type,
840 const struct ttm_place *place,
841 struct ttm_operation_ctx *ctx,
842 struct ww_acquire_ctx *ticket)
843{
844 struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
845 struct ttm_bo_global *glob = bdev->glob;
846 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
847 bool locked = false;
848 unsigned i;
849 int ret;
850
851 spin_lock(&glob->lru_lock);
852 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
853 list_for_each_entry(bo, &man->lru[i], lru) {
854 bool busy;
855
856 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
857 &busy)) {
858 if (busy && !busy_bo && ticket !=
859 dma_resv_locking_ctx(bo->base.resv))
860 busy_bo = bo;
861 continue;
862 }
863
864 if (place && !bdev->driver->eviction_valuable(bo,
865 place)) {
866 if (locked)
867 dma_resv_unlock(bo->base.resv);
868 continue;
869 }
870 break;
871 }
872
873 /* If the inner loop terminated early, we have our candidate */
874 if (&bo->lru != &man->lru[i])
875 break;
876
877 bo = NULL;
878 }
879
880 if (!bo) {
881 if (busy_bo)
882 kref_get(&busy_bo->list_kref);
883 spin_unlock(&glob->lru_lock);
884 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
885 if (busy_bo)
886 kref_put(&busy_bo->list_kref, ttm_bo_release_list);
887 return ret;
888 }
889
890 kref_get(&bo->list_kref);
891
892 if (!list_empty(&bo->ddestroy)) {
893 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
894 ctx->no_wait_gpu, locked);
895 kref_put(&bo->list_kref, ttm_bo_release_list);
896 return ret;
897 }
898
899 ttm_bo_del_from_lru(bo);
900 spin_unlock(&glob->lru_lock);
901
902 ret = ttm_bo_evict(bo, ctx);
903 if (locked) {
904 ttm_bo_unreserve(bo);
905 } else {
906 spin_lock(&glob->lru_lock);
907 ttm_bo_add_to_lru(bo);
908 spin_unlock(&glob->lru_lock);
909 }
910
911 kref_put(&bo->list_kref, ttm_bo_release_list);
912 return ret;
913}
914
915void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
916{
917 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
918
919 if (mem->mm_node)
920 (*man->func->put_node)(man, mem);
921}
922EXPORT_SYMBOL(ttm_bo_mem_put);
923
924/**
925 * Add the last move fence to the BO and reserve a new shared slot.
926 */
927static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
928 struct ttm_mem_type_manager *man,
929 struct ttm_mem_reg *mem)
930{
931 struct dma_fence *fence;
932 int ret;
933
934 spin_lock(&man->move_lock);
935 fence = dma_fence_get(man->move);
936 spin_unlock(&man->move_lock);
937
938 if (fence) {
939 dma_resv_add_shared_fence(bo->base.resv, fence);
940
941 ret = dma_resv_reserve_shared(bo->base.resv, 1);
942 if (unlikely(ret)) {
943 dma_fence_put(fence);
944 return ret;
945 }
946
947 dma_fence_put(bo->moving);
948 bo->moving = fence;
949 }
950
951 return 0;
952}
953
954/**
955 * Repeatedly evict memory from the LRU for @mem_type until we create enough
956 * space, or we've evicted everything and there isn't enough space.
957 */
958static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
959 const struct ttm_place *place,
960 struct ttm_mem_reg *mem,
961 struct ttm_operation_ctx *ctx)
962{
963 struct ttm_bo_device *bdev = bo->bdev;
964 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
965 struct ww_acquire_ctx *ticket;
966 int ret;
967
968 ticket = dma_resv_locking_ctx(bo->base.resv);
969 do {
970 ret = (*man->func->get_node)(man, bo, place, mem);
971 if (unlikely(ret != 0))
972 return ret;
973 if (mem->mm_node)
974 break;
975 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
976 ticket);
977 if (unlikely(ret != 0))
978 return ret;
979 } while (1);
980
981 return ttm_bo_add_move_fence(bo, man, mem);
982}
983
984static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
985 uint32_t cur_placement,
986 uint32_t proposed_placement)
987{
988 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
989 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
990
991 /**
992 * Keep current caching if possible.
993 */
994
995 if ((cur_placement & caching) != 0)
996 result |= (cur_placement & caching);
997 else if ((man->default_caching & caching) != 0)
998 result |= man->default_caching;
999 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1000 result |= TTM_PL_FLAG_CACHED;
1001 else if ((TTM_PL_FLAG_WC & caching) != 0)
1002 result |= TTM_PL_FLAG_WC;
1003 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1004 result |= TTM_PL_FLAG_UNCACHED;
1005
1006 return result;
1007}
1008
1009static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1010 uint32_t mem_type,
1011 const struct ttm_place *place,
1012 uint32_t *masked_placement)
1013{
1014 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1015
1016 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1017 return false;
1018
1019 if ((place->flags & man->available_caching) == 0)
1020 return false;
1021
1022 cur_flags |= (place->flags & man->available_caching);
1023
1024 *masked_placement = cur_flags;
1025 return true;
1026}
1027
1028/**
1029 * ttm_bo_mem_placement - check if placement is compatible
1030 * @bo: BO to find memory for
1031 * @place: where to search
1032 * @mem: the memory object to fill in
1033 * @ctx: operation context
1034 *
1035 * Check if placement is compatible and fill in mem structure.
1036 * Returns -EBUSY if placement won't work or negative error code.
1037 * 0 when placement can be used.
1038 */
1039static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
1040 const struct ttm_place *place,
1041 struct ttm_mem_reg *mem,
1042 struct ttm_operation_ctx *ctx)
1043{
1044 struct ttm_bo_device *bdev = bo->bdev;
1045 uint32_t mem_type = TTM_PL_SYSTEM;
1046 struct ttm_mem_type_manager *man;
1047 uint32_t cur_flags = 0;
1048 int ret;
1049
1050 ret = ttm_mem_type_from_place(place, &mem_type);
1051 if (ret)
1052 return ret;
1053
1054 man = &bdev->man[mem_type];
1055 if (!man->has_type || !man->use_type)
1056 return -EBUSY;
1057
1058 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1059 return -EBUSY;
1060
1061 cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1062 /*
1063 * Use the access and other non-mapping-related flag bits from
1064 * the memory placement flags to the current flags
1065 */
1066 ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1067
1068 mem->mem_type = mem_type;
1069 mem->placement = cur_flags;
1070
1071 if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {
1072 spin_lock(&bo->bdev->glob->lru_lock);
1073 ttm_bo_del_from_lru(bo);
1074 ttm_bo_add_mem_to_lru(bo, mem);
1075 spin_unlock(&bo->bdev->glob->lru_lock);
1076 }
1077
1078 return 0;
1079}
1080
1081/**
1082 * Creates space for memory region @mem according to its type.
1083 *
1084 * This function first searches for free space in compatible memory types in
1085 * the priority order defined by the driver. If free space isn't found, then
1086 * ttm_bo_mem_force_space is attempted in priority order to evict and find
1087 * space.
1088 */
1089int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1090 struct ttm_placement *placement,
1091 struct ttm_mem_reg *mem,
1092 struct ttm_operation_ctx *ctx)
1093{
1094 struct ttm_bo_device *bdev = bo->bdev;
1095 bool type_found = false;
1096 int i, ret;
1097
1098 ret = dma_resv_reserve_shared(bo->base.resv, 1);
1099 if (unlikely(ret))
1100 return ret;
1101
1102 mem->mm_node = NULL;
1103 for (i = 0; i < placement->num_placement; ++i) {
1104 const struct ttm_place *place = &placement->placement[i];
1105 struct ttm_mem_type_manager *man;
1106
1107 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1108 if (ret == -EBUSY)
1109 continue;
1110 if (ret)
1111 goto error;
1112
1113 type_found = true;
1114 mem->mm_node = NULL;
1115 if (mem->mem_type == TTM_PL_SYSTEM)
1116 return 0;
1117
1118 man = &bdev->man[mem->mem_type];
1119 ret = (*man->func->get_node)(man, bo, place, mem);
1120 if (unlikely(ret))
1121 goto error;
1122
1123 if (mem->mm_node) {
1124 ret = ttm_bo_add_move_fence(bo, man, mem);
1125 if (unlikely(ret)) {
1126 (*man->func->put_node)(man, mem);
1127 goto error;
1128 }
1129 return 0;
1130 }
1131 }
1132
1133 for (i = 0; i < placement->num_busy_placement; ++i) {
1134 const struct ttm_place *place = &placement->busy_placement[i];
1135
1136 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1137 if (ret == -EBUSY)
1138 continue;
1139 if (ret)
1140 goto error;
1141
1142 type_found = true;
1143 mem->mm_node = NULL;
1144 if (mem->mem_type == TTM_PL_SYSTEM)
1145 return 0;
1146
1147 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1148 if (ret == 0 && mem->mm_node)
1149 return 0;
1150
1151 if (ret && ret != -EBUSY)
1152 goto error;
1153 }
1154
1155 ret = -ENOMEM;
1156 if (!type_found) {
1157 pr_err(TTM_PFX "No compatible memory type found\n");
1158 ret = -EINVAL;
1159 }
1160
1161error:
1162 if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1163 spin_lock(&bo->bdev->glob->lru_lock);
1164 ttm_bo_move_to_lru_tail(bo, NULL);
1165 spin_unlock(&bo->bdev->glob->lru_lock);
1166 }
1167
1168 return ret;
1169}
1170EXPORT_SYMBOL(ttm_bo_mem_space);
1171
1172static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1173 struct ttm_placement *placement,
1174 struct ttm_operation_ctx *ctx)
1175{
1176 int ret = 0;
1177 struct ttm_mem_reg mem;
1178
1179 dma_resv_assert_held(bo->base.resv);
1180
1181 mem.num_pages = bo->num_pages;
1182 mem.size = mem.num_pages << PAGE_SHIFT;
1183 mem.page_alignment = bo->mem.page_alignment;
1184 mem.bus.io_reserved_vm = false;
1185 mem.bus.io_reserved_count = 0;
1186 /*
1187 * Determine where to move the buffer.
1188 */
1189 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1190 if (ret)
1191 goto out_unlock;
1192 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1193out_unlock:
1194 if (ret && mem.mm_node)
1195 ttm_bo_mem_put(bo, &mem);
1196 return ret;
1197}
1198
1199static bool ttm_bo_places_compat(const struct ttm_place *places,
1200 unsigned num_placement,
1201 struct ttm_mem_reg *mem,
1202 uint32_t *new_flags)
1203{
1204 unsigned i;
1205
1206 for (i = 0; i < num_placement; i++) {
1207 const struct ttm_place *heap = &places[i];
1208
1209 if (mem->mm_node && (mem->start < heap->fpfn ||
1210 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1211 continue;
1212
1213 *new_flags = heap->flags;
1214 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1215 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1216 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1217 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1218 return true;
1219 }
1220 return false;
1221}
1222
1223bool ttm_bo_mem_compat(struct ttm_placement *placement,
1224 struct ttm_mem_reg *mem,
1225 uint32_t *new_flags)
1226{
1227 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1228 mem, new_flags))
1229 return true;
1230
1231 if ((placement->busy_placement != placement->placement ||
1232 placement->num_busy_placement > placement->num_placement) &&
1233 ttm_bo_places_compat(placement->busy_placement,
1234 placement->num_busy_placement,
1235 mem, new_flags))
1236 return true;
1237
1238 return false;
1239}
1240EXPORT_SYMBOL(ttm_bo_mem_compat);
1241
1242int ttm_bo_validate(struct ttm_buffer_object *bo,
1243 struct ttm_placement *placement,
1244 struct ttm_operation_ctx *ctx)
1245{
1246 int ret;
1247 uint32_t new_flags;
1248
1249 dma_resv_assert_held(bo->base.resv);
1250 /*
1251 * Check whether we need to move buffer.
1252 */
1253 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1254 ret = ttm_bo_move_buffer(bo, placement, ctx);
1255 if (ret)
1256 return ret;
1257 } else {
1258 /*
1259 * Use the access and other non-mapping-related flag bits from
1260 * the compatible memory placement flags to the active flags
1261 */
1262 ttm_flag_masked(&bo->mem.placement, new_flags,
1263 ~TTM_PL_MASK_MEMTYPE);
1264 }
1265 /*
1266 * We might need to add a TTM.
1267 */
1268 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1269 ret = ttm_tt_create(bo, true);
1270 if (ret)
1271 return ret;
1272 }
1273 return 0;
1274}
1275EXPORT_SYMBOL(ttm_bo_validate);
1276
1277int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1278 struct ttm_buffer_object *bo,
1279 unsigned long size,
1280 enum ttm_bo_type type,
1281 struct ttm_placement *placement,
1282 uint32_t page_alignment,
1283 struct ttm_operation_ctx *ctx,
1284 size_t acc_size,
1285 struct sg_table *sg,
1286 struct dma_resv *resv,
1287 void (*destroy) (struct ttm_buffer_object *))
1288{
1289 int ret = 0;
1290 unsigned long num_pages;
1291 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1292 bool locked;
1293
1294 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1295 if (ret) {
1296 pr_err("Out of kernel memory\n");
1297 if (destroy)
1298 (*destroy)(bo);
1299 else
1300 kfree(bo);
1301 return -ENOMEM;
1302 }
1303
1304 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1305 if (num_pages == 0) {
1306 pr_err("Illegal buffer object size\n");
1307 if (destroy)
1308 (*destroy)(bo);
1309 else
1310 kfree(bo);
1311 ttm_mem_global_free(mem_glob, acc_size);
1312 return -EINVAL;
1313 }
1314 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1315
1316 kref_init(&bo->kref);
1317 kref_init(&bo->list_kref);
1318 atomic_set(&bo->cpu_writers, 0);
1319 INIT_LIST_HEAD(&bo->lru);
1320 INIT_LIST_HEAD(&bo->ddestroy);
1321 INIT_LIST_HEAD(&bo->swap);
1322 INIT_LIST_HEAD(&bo->io_reserve_lru);
1323 mutex_init(&bo->wu_mutex);
1324 bo->bdev = bdev;
1325 bo->type = type;
1326 bo->num_pages = num_pages;
1327 bo->mem.size = num_pages << PAGE_SHIFT;
1328 bo->mem.mem_type = TTM_PL_SYSTEM;
1329 bo->mem.num_pages = bo->num_pages;
1330 bo->mem.mm_node = NULL;
1331 bo->mem.page_alignment = page_alignment;
1332 bo->mem.bus.io_reserved_vm = false;
1333 bo->mem.bus.io_reserved_count = 0;
1334 bo->moving = NULL;
1335 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1336 bo->acc_size = acc_size;
1337 bo->sg = sg;
1338 if (resv) {
1339 bo->base.resv = resv;
1340 dma_resv_assert_held(bo->base.resv);
1341 } else {
1342 bo->base.resv = &bo->base._resv;
1343 }
1344 if (!ttm_bo_uses_embedded_gem_object(bo)) {
1345 /*
1346 * bo.gem is not initialized, so we have to setup the
1347 * struct elements we want use regardless.
1348 */
1349 dma_resv_init(&bo->base._resv);
1350 drm_vma_node_reset(&bo->base.vma_node);
1351 }
1352 atomic_inc(&bo->bdev->glob->bo_count);
1353
1354 /*
1355 * For ttm_bo_type_device buffers, allocate
1356 * address space from the device.
1357 */
1358 if (bo->type == ttm_bo_type_device ||
1359 bo->type == ttm_bo_type_sg)
1360 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->base.vma_node,
1361 bo->mem.num_pages);
1362
1363 /* passed reservation objects should already be locked,
1364 * since otherwise lockdep will be angered in radeon.
1365 */
1366 if (!resv) {
1367 locked = dma_resv_trylock(bo->base.resv);
1368 WARN_ON(!locked);
1369 }
1370
1371 if (likely(!ret))
1372 ret = ttm_bo_validate(bo, placement, ctx);
1373
1374 if (unlikely(ret)) {
1375 if (!resv)
1376 ttm_bo_unreserve(bo);
1377
1378 ttm_bo_put(bo);
1379 return ret;
1380 }
1381
1382 if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1383 spin_lock(&bdev->glob->lru_lock);
1384 ttm_bo_add_to_lru(bo);
1385 spin_unlock(&bdev->glob->lru_lock);
1386 }
1387
1388 return ret;
1389}
1390EXPORT_SYMBOL(ttm_bo_init_reserved);
1391
1392int ttm_bo_init(struct ttm_bo_device *bdev,
1393 struct ttm_buffer_object *bo,
1394 unsigned long size,
1395 enum ttm_bo_type type,
1396 struct ttm_placement *placement,
1397 uint32_t page_alignment,
1398 bool interruptible,
1399 size_t acc_size,
1400 struct sg_table *sg,
1401 struct dma_resv *resv,
1402 void (*destroy) (struct ttm_buffer_object *))
1403{
1404 struct ttm_operation_ctx ctx = { interruptible, false };
1405 int ret;
1406
1407 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1408 page_alignment, &ctx, acc_size,
1409 sg, resv, destroy);
1410 if (ret)
1411 return ret;
1412
1413 if (!resv)
1414 ttm_bo_unreserve(bo);
1415
1416 return 0;
1417}
1418EXPORT_SYMBOL(ttm_bo_init);
1419
1420size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1421 unsigned long bo_size,
1422 unsigned struct_size)
1423{
1424 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1425 size_t size = 0;
1426
1427 size += ttm_round_pot(struct_size);
1428 size += ttm_round_pot(npages * sizeof(void *));
1429 size += ttm_round_pot(sizeof(struct ttm_tt));
1430 return size;
1431}
1432EXPORT_SYMBOL(ttm_bo_acc_size);
1433
1434size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1435 unsigned long bo_size,
1436 unsigned struct_size)
1437{
1438 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1439 size_t size = 0;
1440
1441 size += ttm_round_pot(struct_size);
1442 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1443 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1444 return size;
1445}
1446EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1447
1448int ttm_bo_create(struct ttm_bo_device *bdev,
1449 unsigned long size,
1450 enum ttm_bo_type type,
1451 struct ttm_placement *placement,
1452 uint32_t page_alignment,
1453 bool interruptible,
1454 struct ttm_buffer_object **p_bo)
1455{
1456 struct ttm_buffer_object *bo;
1457 size_t acc_size;
1458 int ret;
1459
1460 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1461 if (unlikely(bo == NULL))
1462 return -ENOMEM;
1463
1464 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1465 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1466 interruptible, acc_size,
1467 NULL, NULL, NULL);
1468 if (likely(ret == 0))
1469 *p_bo = bo;
1470
1471 return ret;
1472}
1473EXPORT_SYMBOL(ttm_bo_create);
1474
1475static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1476 unsigned mem_type)
1477{
1478 struct ttm_operation_ctx ctx = {
1479 .interruptible = false,
1480 .no_wait_gpu = false,
1481 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1482 };
1483 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1484 struct ttm_bo_global *glob = bdev->glob;
1485 struct dma_fence *fence;
1486 int ret;
1487 unsigned i;
1488
1489 /*
1490 * Can't use standard list traversal since we're unlocking.
1491 */
1492
1493 spin_lock(&glob->lru_lock);
1494 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1495 while (!list_empty(&man->lru[i])) {
1496 spin_unlock(&glob->lru_lock);
1497 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1498 NULL);
1499 if (ret)
1500 return ret;
1501 spin_lock(&glob->lru_lock);
1502 }
1503 }
1504 spin_unlock(&glob->lru_lock);
1505
1506 spin_lock(&man->move_lock);
1507 fence = dma_fence_get(man->move);
1508 spin_unlock(&man->move_lock);
1509
1510 if (fence) {
1511 ret = dma_fence_wait(fence, false);
1512 dma_fence_put(fence);
1513 if (ret)
1514 return ret;
1515 }
1516
1517 return 0;
1518}
1519
1520int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1521{
1522 struct ttm_mem_type_manager *man;
1523 int ret = -EINVAL;
1524
1525 if (mem_type >= TTM_NUM_MEM_TYPES) {
1526 pr_err("Illegal memory type %d\n", mem_type);
1527 return ret;
1528 }
1529 man = &bdev->man[mem_type];
1530
1531 if (!man->has_type) {
1532 pr_err("Trying to take down uninitialized memory manager type %u\n",
1533 mem_type);
1534 return ret;
1535 }
1536
1537 man->use_type = false;
1538 man->has_type = false;
1539
1540 ret = 0;
1541 if (mem_type > 0) {
1542 ret = ttm_bo_force_list_clean(bdev, mem_type);
1543 if (ret) {
1544 pr_err("Cleanup eviction failed\n");
1545 return ret;
1546 }
1547
1548 ret = (*man->func->takedown)(man);
1549 }
1550
1551 dma_fence_put(man->move);
1552 man->move = NULL;
1553
1554 return ret;
1555}
1556EXPORT_SYMBOL(ttm_bo_clean_mm);
1557
1558int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1559{
1560 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1561
1562 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1563 pr_err("Illegal memory manager memory type %u\n", mem_type);
1564 return -EINVAL;
1565 }
1566
1567 if (!man->has_type) {
1568 pr_err("Memory type %u has not been initialized\n", mem_type);
1569 return 0;
1570 }
1571
1572 return ttm_bo_force_list_clean(bdev, mem_type);
1573}
1574EXPORT_SYMBOL(ttm_bo_evict_mm);
1575
1576int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1577 unsigned long p_size)
1578{
1579 int ret;
1580 struct ttm_mem_type_manager *man;
1581 unsigned i;
1582
1583 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1584 man = &bdev->man[type];
1585 BUG_ON(man->has_type);
1586 man->io_reserve_fastpath = true;
1587 man->use_io_reserve_lru = false;
1588 mutex_init(&man->io_reserve_mutex);
1589 spin_lock_init(&man->move_lock);
1590 INIT_LIST_HEAD(&man->io_reserve_lru);
1591
1592 ret = bdev->driver->init_mem_type(bdev, type, man);
1593 if (ret)
1594 return ret;
1595 man->bdev = bdev;
1596
1597 if (type != TTM_PL_SYSTEM) {
1598 ret = (*man->func->init)(man, p_size);
1599 if (ret)
1600 return ret;
1601 }
1602 man->has_type = true;
1603 man->use_type = true;
1604 man->size = p_size;
1605
1606 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1607 INIT_LIST_HEAD(&man->lru[i]);
1608 man->move = NULL;
1609
1610 return 0;
1611}
1612EXPORT_SYMBOL(ttm_bo_init_mm);
1613
1614static void ttm_bo_global_kobj_release(struct kobject *kobj)
1615{
1616 struct ttm_bo_global *glob =
1617 container_of(kobj, struct ttm_bo_global, kobj);
1618
1619 __free_page(glob->dummy_read_page);
1620}
1621
1622static void ttm_bo_global_release(void)
1623{
1624 struct ttm_bo_global *glob = &ttm_bo_glob;
1625
1626 mutex_lock(&ttm_global_mutex);
1627 if (--ttm_bo_glob_use_count > 0)
1628 goto out;
1629
1630 kobject_del(&glob->kobj);
1631 kobject_put(&glob->kobj);
1632 ttm_mem_global_release(&ttm_mem_glob);
1633 memset(glob, 0, sizeof(*glob));
1634out:
1635 mutex_unlock(&ttm_global_mutex);
1636}
1637
1638static int ttm_bo_global_init(void)
1639{
1640 struct ttm_bo_global *glob = &ttm_bo_glob;
1641 int ret = 0;
1642 unsigned i;
1643
1644 mutex_lock(&ttm_global_mutex);
1645 if (++ttm_bo_glob_use_count > 1)
1646 goto out;
1647
1648 ret = ttm_mem_global_init(&ttm_mem_glob);
1649 if (ret)
1650 goto out;
1651
1652 spin_lock_init(&glob->lru_lock);
1653 glob->mem_glob = &ttm_mem_glob;
1654 glob->mem_glob->bo_glob = glob;
1655 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1656
1657 if (unlikely(glob->dummy_read_page == NULL)) {
1658 ret = -ENOMEM;
1659 goto out;
1660 }
1661
1662 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1663 INIT_LIST_HEAD(&glob->swap_lru[i]);
1664 INIT_LIST_HEAD(&glob->device_list);
1665 atomic_set(&glob->bo_count, 0);
1666
1667 ret = kobject_init_and_add(
1668 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1669 if (unlikely(ret != 0))
1670 kobject_put(&glob->kobj);
1671out:
1672 mutex_unlock(&ttm_global_mutex);
1673 return ret;
1674}
1675
1676int ttm_bo_device_release(struct ttm_bo_device *bdev)
1677{
1678 int ret = 0;
1679 unsigned i = TTM_NUM_MEM_TYPES;
1680 struct ttm_mem_type_manager *man;
1681 struct ttm_bo_global *glob = bdev->glob;
1682
1683 while (i--) {
1684 man = &bdev->man[i];
1685 if (man->has_type) {
1686 man->use_type = false;
1687 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1688 ret = -EBUSY;
1689 pr_err("DRM memory manager type %d is not clean\n",
1690 i);
1691 }
1692 man->has_type = false;
1693 }
1694 }
1695
1696 mutex_lock(&ttm_global_mutex);
1697 list_del(&bdev->device_list);
1698 mutex_unlock(&ttm_global_mutex);
1699
1700 cancel_delayed_work_sync(&bdev->wq);
1701
1702 if (ttm_bo_delayed_delete(bdev, true))
1703 pr_debug("Delayed destroy list was clean\n");
1704
1705 spin_lock(&glob->lru_lock);
1706 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1707 if (list_empty(&bdev->man[0].lru[0]))
1708 pr_debug("Swap list %d was clean\n", i);
1709 spin_unlock(&glob->lru_lock);
1710
1711 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1712
1713 if (!ret)
1714 ttm_bo_global_release();
1715
1716 return ret;
1717}
1718EXPORT_SYMBOL(ttm_bo_device_release);
1719
1720int ttm_bo_device_init(struct ttm_bo_device *bdev,
1721 struct ttm_bo_driver *driver,
1722 struct address_space *mapping,
1723 bool need_dma32)
1724{
1725 struct ttm_bo_global *glob = &ttm_bo_glob;
1726 int ret;
1727
1728 ret = ttm_bo_global_init();
1729 if (ret)
1730 return ret;
1731
1732 bdev->driver = driver;
1733
1734 memset(bdev->man, 0, sizeof(bdev->man));
1735
1736 /*
1737 * Initialize the system memory buffer type.
1738 * Other types need to be driver / IOCTL initialized.
1739 */
1740 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1741 if (unlikely(ret != 0))
1742 goto out_no_sys;
1743
1744 drm_vma_offset_manager_init(&bdev->vma_manager,
1745 DRM_FILE_PAGE_OFFSET_START,
1746 DRM_FILE_PAGE_OFFSET_SIZE);
1747 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1748 INIT_LIST_HEAD(&bdev->ddestroy);
1749 bdev->dev_mapping = mapping;
1750 bdev->glob = glob;
1751 bdev->need_dma32 = need_dma32;
1752 mutex_lock(&ttm_global_mutex);
1753 list_add_tail(&bdev->device_list, &glob->device_list);
1754 mutex_unlock(&ttm_global_mutex);
1755
1756 return 0;
1757out_no_sys:
1758 ttm_bo_global_release();
1759 return ret;
1760}
1761EXPORT_SYMBOL(ttm_bo_device_init);
1762
1763/*
1764 * buffer object vm functions.
1765 */
1766
1767bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1768{
1769 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1770
1771 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1772 if (mem->mem_type == TTM_PL_SYSTEM)
1773 return false;
1774
1775 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1776 return false;
1777
1778 if (mem->placement & TTM_PL_FLAG_CACHED)
1779 return false;
1780 }
1781 return true;
1782}
1783
1784void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1785{
1786 struct ttm_bo_device *bdev = bo->bdev;
1787
1788 drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1789 ttm_mem_io_free_vm(bo);
1790}
1791
1792void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1793{
1794 struct ttm_bo_device *bdev = bo->bdev;
1795 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1796
1797 ttm_mem_io_lock(man, false);
1798 ttm_bo_unmap_virtual_locked(bo);
1799 ttm_mem_io_unlock(man);
1800}
1801
1802
1803EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1804
1805int ttm_bo_wait(struct ttm_buffer_object *bo,
1806 bool interruptible, bool no_wait)
1807{
1808 long timeout = 15 * HZ;
1809
1810 if (no_wait) {
1811 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1812 return 0;
1813 else
1814 return -EBUSY;
1815 }
1816
1817 timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1818 interruptible, timeout);
1819 if (timeout < 0)
1820 return timeout;
1821
1822 if (timeout == 0)
1823 return -EBUSY;
1824
1825 dma_resv_add_excl_fence(bo->base.resv, NULL);
1826 return 0;
1827}
1828EXPORT_SYMBOL(ttm_bo_wait);
1829
1830int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1831{
1832 int ret = 0;
1833
1834 /*
1835 * Using ttm_bo_reserve makes sure the lru lists are updated.
1836 */
1837
1838 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1839 if (unlikely(ret != 0))
1840 return ret;
1841 ret = ttm_bo_wait(bo, true, no_wait);
1842 if (likely(ret == 0))
1843 atomic_inc(&bo->cpu_writers);
1844 ttm_bo_unreserve(bo);
1845 return ret;
1846}
1847EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1848
1849void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1850{
1851 atomic_dec(&bo->cpu_writers);
1852}
1853EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1854
1855/**
1856 * A buffer object shrink method that tries to swap out the first
1857 * buffer object on the bo_global::swap_lru list.
1858 */
1859int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1860{
1861 struct ttm_buffer_object *bo;
1862 int ret = -EBUSY;
1863 bool locked;
1864 unsigned i;
1865
1866 spin_lock(&glob->lru_lock);
1867 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1868 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1869 if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1870 NULL)) {
1871 ret = 0;
1872 break;
1873 }
1874 }
1875 if (!ret)
1876 break;
1877 }
1878
1879 if (ret) {
1880 spin_unlock(&glob->lru_lock);
1881 return ret;
1882 }
1883
1884 kref_get(&bo->list_kref);
1885
1886 if (!list_empty(&bo->ddestroy)) {
1887 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1888 kref_put(&bo->list_kref, ttm_bo_release_list);
1889 return ret;
1890 }
1891
1892 ttm_bo_del_from_lru(bo);
1893 spin_unlock(&glob->lru_lock);
1894
1895 /**
1896 * Move to system cached
1897 */
1898
1899 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1900 bo->ttm->caching_state != tt_cached) {
1901 struct ttm_operation_ctx ctx = { false, false };
1902 struct ttm_mem_reg evict_mem;
1903
1904 evict_mem = bo->mem;
1905 evict_mem.mm_node = NULL;
1906 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1907 evict_mem.mem_type = TTM_PL_SYSTEM;
1908
1909 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1910 if (unlikely(ret != 0))
1911 goto out;
1912 }
1913
1914 /**
1915 * Make sure BO is idle.
1916 */
1917
1918 ret = ttm_bo_wait(bo, false, false);
1919 if (unlikely(ret != 0))
1920 goto out;
1921
1922 ttm_bo_unmap_virtual(bo);
1923
1924 /**
1925 * Swap out. Buffer will be swapped in again as soon as
1926 * anyone tries to access a ttm page.
1927 */
1928
1929 if (bo->bdev->driver->swap_notify)
1930 bo->bdev->driver->swap_notify(bo);
1931
1932 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1933out:
1934
1935 /**
1936 *
1937 * Unreserve without putting on LRU to avoid swapping out an
1938 * already swapped buffer.
1939 */
1940 if (locked)
1941 dma_resv_unlock(bo->base.resv);
1942 kref_put(&bo->list_kref, ttm_bo_release_list);
1943 return ret;
1944}
1945EXPORT_SYMBOL(ttm_bo_swapout);
1946
1947void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1948{
1949 struct ttm_operation_ctx ctx = {
1950 .interruptible = false,
1951 .no_wait_gpu = false
1952 };
1953
1954 while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1955 ;
1956}
1957EXPORT_SYMBOL(ttm_bo_swapout_all);
1958
1959/**
1960 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1961 * unreserved
1962 *
1963 * @bo: Pointer to buffer
1964 */
1965int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1966{
1967 int ret;
1968
1969 /*
1970 * In the absense of a wait_unlocked API,
1971 * Use the bo::wu_mutex to avoid triggering livelocks due to
1972 * concurrent use of this function. Note that this use of
1973 * bo::wu_mutex can go away if we change locking order to
1974 * mmap_sem -> bo::reserve.
1975 */
1976 ret = mutex_lock_interruptible(&bo->wu_mutex);
1977 if (unlikely(ret != 0))
1978 return -ERESTARTSYS;
1979 if (!dma_resv_is_locked(bo->base.resv))
1980 goto out_unlock;
1981 ret = dma_resv_lock_interruptible(bo->base.resv, NULL);
1982 if (ret == -EINTR)
1983 ret = -ERESTARTSYS;
1984 if (unlikely(ret != 0))
1985 goto out_unlock;
1986 dma_resv_unlock(bo->base.resv);
1987
1988out_unlock:
1989 mutex_unlock(&bo->wu_mutex);
1990 return ret;
1991}