1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2007-2009 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#include <linux/vmalloc.h>
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 <drm/drm_cache.h>
39
40struct ttm_transfer_obj {
41 struct ttm_buffer_object base;
42 struct ttm_buffer_object *bo;
43};
44
45int ttm_mem_io_reserve(struct ttm_device *bdev,
46 struct ttm_resource *mem)
47{
48 if (mem->bus.offset || mem->bus.addr)
49 return 0;
50
51 mem->bus.is_iomem = false;
52 if (!bdev->funcs->io_mem_reserve)
53 return 0;
54
55 return bdev->funcs->io_mem_reserve(bdev, mem);
56}
57
58void ttm_mem_io_free(struct ttm_device *bdev,
59 struct ttm_resource *mem)
60{
61 if (!mem)
62 return;
63
64 if (!mem->bus.offset && !mem->bus.addr)
65 return;
66
67 if (bdev->funcs->io_mem_free)
68 bdev->funcs->io_mem_free(bdev, mem);
69
70 mem->bus.offset = 0;
71 mem->bus.addr = NULL;
72}
73
74/**
75 * ttm_move_memcpy - Helper to perform a memcpy ttm move operation.
76 * @clear: Whether to clear rather than copy.
77 * @num_pages: Number of pages of the operation.
78 * @dst_iter: A struct ttm_kmap_iter representing the destination resource.
79 * @src_iter: A struct ttm_kmap_iter representing the source resource.
80 *
81 * This function is intended to be able to move out async under a
82 * dma-fence if desired.
83 */
84void ttm_move_memcpy(bool clear,
85 u32 num_pages,
86 struct ttm_kmap_iter *dst_iter,
87 struct ttm_kmap_iter *src_iter)
88{
89 const struct ttm_kmap_iter_ops *dst_ops = dst_iter->ops;
90 const struct ttm_kmap_iter_ops *src_ops = src_iter->ops;
91 struct iosys_map src_map, dst_map;
92 pgoff_t i;
93
94 /* Single TTM move. NOP */
95 if (dst_ops->maps_tt && src_ops->maps_tt)
96 return;
97
98 /* Don't move nonexistent data. Clear destination instead. */
99 if (clear) {
100 for (i = 0; i < num_pages; ++i) {
101 dst_ops->map_local(dst_iter, &dst_map, i);
102 if (dst_map.is_iomem)
103 memset_io(dst_map.vaddr_iomem, 0, PAGE_SIZE);
104 else
105 memset(dst_map.vaddr, 0, PAGE_SIZE);
106 if (dst_ops->unmap_local)
107 dst_ops->unmap_local(dst_iter, &dst_map);
108 }
109 return;
110 }
111
112 for (i = 0; i < num_pages; ++i) {
113 dst_ops->map_local(dst_iter, &dst_map, i);
114 src_ops->map_local(src_iter, &src_map, i);
115
116 drm_memcpy_from_wc(dst: &dst_map, src: &src_map, PAGE_SIZE);
117
118 if (src_ops->unmap_local)
119 src_ops->unmap_local(src_iter, &src_map);
120 if (dst_ops->unmap_local)
121 dst_ops->unmap_local(dst_iter, &dst_map);
122 }
123}
124EXPORT_SYMBOL(ttm_move_memcpy);
125
126/**
127 * ttm_bo_move_memcpy
128 *
129 * @bo: A pointer to a struct ttm_buffer_object.
130 * @ctx: operation context
131 * @dst_mem: struct ttm_resource indicating where to move.
132 *
133 * Fallback move function for a mappable buffer object in mappable memory.
134 * The function will, if successful,
135 * free any old aperture space, and set (@new_mem)->mm_node to NULL,
136 * and update the (@bo)->mem placement flags. If unsuccessful, the old
137 * data remains untouched, and it's up to the caller to free the
138 * memory space indicated by @new_mem.
139 * Returns:
140 * !0: Failure.
141 */
142int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
143 struct ttm_operation_ctx *ctx,
144 struct ttm_resource *dst_mem)
145{
146 struct ttm_device *bdev = bo->bdev;
147 struct ttm_resource_manager *dst_man =
148 ttm_manager_type(bdev: bo->bdev, mem_type: dst_mem->mem_type);
149 struct ttm_tt *ttm = bo->ttm;
150 struct ttm_resource *src_mem = bo->resource;
151 struct ttm_resource_manager *src_man;
152 union {
153 struct ttm_kmap_iter_tt tt;
154 struct ttm_kmap_iter_linear_io io;
155 } _dst_iter, _src_iter;
156 struct ttm_kmap_iter *dst_iter, *src_iter;
157 bool clear;
158 int ret = 0;
159
160 if (WARN_ON(!src_mem))
161 return -EINVAL;
162
163 src_man = ttm_manager_type(bdev, mem_type: src_mem->mem_type);
164 if (ttm && ((ttm->page_flags & TTM_TT_FLAG_SWAPPED) ||
165 dst_man->use_tt)) {
166 ret = ttm_tt_populate(bdev, ttm, ctx);
167 if (ret)
168 return ret;
169 }
170
171 dst_iter = ttm_kmap_iter_linear_io_init(iter_io: &_dst_iter.io, bdev, mem: dst_mem);
172 if (PTR_ERR(ptr: dst_iter) == -EINVAL && dst_man->use_tt)
173 dst_iter = ttm_kmap_iter_tt_init(iter_tt: &_dst_iter.tt, tt: bo->ttm);
174 if (IS_ERR(ptr: dst_iter))
175 return PTR_ERR(ptr: dst_iter);
176
177 src_iter = ttm_kmap_iter_linear_io_init(iter_io: &_src_iter.io, bdev, mem: src_mem);
178 if (PTR_ERR(ptr: src_iter) == -EINVAL && src_man->use_tt)
179 src_iter = ttm_kmap_iter_tt_init(iter_tt: &_src_iter.tt, tt: bo->ttm);
180 if (IS_ERR(ptr: src_iter)) {
181 ret = PTR_ERR(ptr: src_iter);
182 goto out_src_iter;
183 }
184
185 clear = src_iter->ops->maps_tt && (!ttm || !ttm_tt_is_populated(tt: ttm));
186 if (!(clear && ttm && !(ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC)))
187 ttm_move_memcpy(clear, PFN_UP(dst_mem->size), dst_iter, src_iter);
188
189 if (!src_iter->ops->maps_tt)
190 ttm_kmap_iter_linear_io_fini(iter_io: &_src_iter.io, bdev, mem: src_mem);
191 ttm_bo_move_sync_cleanup(bo, new_mem: dst_mem);
192
193out_src_iter:
194 if (!dst_iter->ops->maps_tt)
195 ttm_kmap_iter_linear_io_fini(iter_io: &_dst_iter.io, bdev, mem: dst_mem);
196
197 return ret;
198}
199EXPORT_SYMBOL(ttm_bo_move_memcpy);
200
201static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
202{
203 struct ttm_transfer_obj *fbo;
204
205 fbo = container_of(bo, struct ttm_transfer_obj, base);
206 dma_resv_fini(obj: &fbo->base.base._resv);
207 ttm_bo_put(bo: fbo->bo);
208 kfree(objp: fbo);
209}
210
211/**
212 * ttm_buffer_object_transfer
213 *
214 * @bo: A pointer to a struct ttm_buffer_object.
215 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
216 * holding the data of @bo with the old placement.
217 *
218 * This is a utility function that may be called after an accelerated move
219 * has been scheduled. A new buffer object is created as a placeholder for
220 * the old data while it's being copied. When that buffer object is idle,
221 * it can be destroyed, releasing the space of the old placement.
222 * Returns:
223 * !0: Failure.
224 */
225
226static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
227 struct ttm_buffer_object **new_obj)
228{
229 struct ttm_transfer_obj *fbo;
230 int ret;
231
232 fbo = kmalloc(size: sizeof(*fbo), GFP_KERNEL);
233 if (!fbo)
234 return -ENOMEM;
235
236 fbo->base = *bo;
237
238 /**
239 * Fix up members that we shouldn't copy directly:
240 * TODO: Explicit member copy would probably be better here.
241 */
242
243 atomic_inc(v: &ttm_glob.bo_count);
244 drm_vma_node_reset(node: &fbo->base.base.vma_node);
245
246 kref_init(kref: &fbo->base.kref);
247 fbo->base.destroy = &ttm_transfered_destroy;
248 fbo->base.pin_count = 0;
249 if (bo->type != ttm_bo_type_sg)
250 fbo->base.base.resv = &fbo->base.base._resv;
251
252 dma_resv_init(obj: &fbo->base.base._resv);
253 fbo->base.base.dev = NULL;
254 ret = dma_resv_trylock(obj: &fbo->base.base._resv);
255 WARN_ON(!ret);
256
257 if (fbo->base.resource) {
258 ttm_resource_set_bo(res: fbo->base.resource, bo: &fbo->base);
259 bo->resource = NULL;
260 ttm_bo_set_bulk_move(bo: &fbo->base, NULL);
261 } else {
262 fbo->base.bulk_move = NULL;
263 }
264
265 ret = dma_resv_reserve_fences(obj: &fbo->base.base._resv, num_fences: 1);
266 if (ret) {
267 kfree(objp: fbo);
268 return ret;
269 }
270
271 ttm_bo_get(bo);
272 fbo->bo = bo;
273
274 ttm_bo_move_to_lru_tail_unlocked(bo: &fbo->base);
275
276 *new_obj = &fbo->base;
277 return 0;
278}
279
280/**
281 * ttm_io_prot
282 *
283 * @bo: ttm buffer object
284 * @res: ttm resource object
285 * @tmp: Page protection flag for a normal, cached mapping.
286 *
287 * Utility function that returns the pgprot_t that should be used for
288 * setting up a PTE with the caching model indicated by @c_state.
289 */
290pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
291 pgprot_t tmp)
292{
293 struct ttm_resource_manager *man;
294 enum ttm_caching caching;
295
296 man = ttm_manager_type(bdev: bo->bdev, mem_type: res->mem_type);
297 if (man->use_tt) {
298 caching = bo->ttm->caching;
299 if (bo->ttm->page_flags & TTM_TT_FLAG_DECRYPTED)
300 tmp = pgprot_decrypted(tmp);
301 } else {
302 caching = res->bus.caching;
303 }
304
305 return ttm_prot_from_caching(caching, tmp);
306}
307EXPORT_SYMBOL(ttm_io_prot);
308
309static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
310 unsigned long offset,
311 unsigned long size,
312 struct ttm_bo_kmap_obj *map)
313{
314 struct ttm_resource *mem = bo->resource;
315
316 if (bo->resource->bus.addr) {
317 map->bo_kmap_type = ttm_bo_map_premapped;
318 map->virtual = ((u8 *)bo->resource->bus.addr) + offset;
319 } else {
320 resource_size_t res = bo->resource->bus.offset + offset;
321
322 map->bo_kmap_type = ttm_bo_map_iomap;
323 if (mem->bus.caching == ttm_write_combined)
324 map->virtual = ioremap_wc(offset: res, size);
325#ifdef CONFIG_X86
326 else if (mem->bus.caching == ttm_cached)
327 map->virtual = ioremap_cache(offset: res, size);
328#endif
329 else
330 map->virtual = ioremap(offset: res, size);
331 }
332 return (!map->virtual) ? -ENOMEM : 0;
333}
334
335static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
336 unsigned long start_page,
337 unsigned long num_pages,
338 struct ttm_bo_kmap_obj *map)
339{
340 struct ttm_resource *mem = bo->resource;
341 struct ttm_operation_ctx ctx = {
342 .interruptible = false,
343 .no_wait_gpu = false
344 };
345 struct ttm_tt *ttm = bo->ttm;
346 struct ttm_resource_manager *man =
347 ttm_manager_type(bdev: bo->bdev, mem_type: bo->resource->mem_type);
348 pgprot_t prot;
349 int ret;
350
351 BUG_ON(!ttm);
352
353 ret = ttm_tt_populate(bdev: bo->bdev, ttm, ctx: &ctx);
354 if (ret)
355 return ret;
356
357 if (num_pages == 1 && ttm->caching == ttm_cached &&
358 !(man->use_tt && (ttm->page_flags & TTM_TT_FLAG_DECRYPTED))) {
359 /*
360 * We're mapping a single page, and the desired
361 * page protection is consistent with the bo.
362 */
363
364 map->bo_kmap_type = ttm_bo_map_kmap;
365 map->page = ttm->pages[start_page];
366 map->virtual = kmap(page: map->page);
367 } else {
368 /*
369 * We need to use vmap to get the desired page protection
370 * or to make the buffer object look contiguous.
371 */
372 prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
373 map->bo_kmap_type = ttm_bo_map_vmap;
374 map->virtual = vmap(pages: ttm->pages + start_page, count: num_pages,
375 flags: 0, prot);
376 }
377 return (!map->virtual) ? -ENOMEM : 0;
378}
379
380/**
381 * ttm_bo_kmap
382 *
383 * @bo: The buffer object.
384 * @start_page: The first page to map.
385 * @num_pages: Number of pages to map.
386 * @map: pointer to a struct ttm_bo_kmap_obj representing the map.
387 *
388 * Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the
389 * data in the buffer object. The ttm_kmap_obj_virtual function can then be
390 * used to obtain a virtual address to the data.
391 *
392 * Returns
393 * -ENOMEM: Out of memory.
394 * -EINVAL: Invalid range.
395 */
396int ttm_bo_kmap(struct ttm_buffer_object *bo,
397 unsigned long start_page, unsigned long num_pages,
398 struct ttm_bo_kmap_obj *map)
399{
400 unsigned long offset, size;
401 int ret;
402
403 map->virtual = NULL;
404 map->bo = bo;
405 if (num_pages > PFN_UP(bo->resource->size))
406 return -EINVAL;
407 if ((start_page + num_pages) > PFN_UP(bo->resource->size))
408 return -EINVAL;
409
410 ret = ttm_mem_io_reserve(bdev: bo->bdev, mem: bo->resource);
411 if (ret)
412 return ret;
413 if (!bo->resource->bus.is_iomem) {
414 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
415 } else {
416 offset = start_page << PAGE_SHIFT;
417 size = num_pages << PAGE_SHIFT;
418 return ttm_bo_ioremap(bo, offset, size, map);
419 }
420}
421EXPORT_SYMBOL(ttm_bo_kmap);
422
423/**
424 * ttm_bo_kunmap
425 *
426 * @map: Object describing the map to unmap.
427 *
428 * Unmaps a kernel map set up by ttm_bo_kmap.
429 */
430void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
431{
432 if (!map->virtual)
433 return;
434 switch (map->bo_kmap_type) {
435 case ttm_bo_map_iomap:
436 iounmap(addr: map->virtual);
437 break;
438 case ttm_bo_map_vmap:
439 vunmap(addr: map->virtual);
440 break;
441 case ttm_bo_map_kmap:
442 kunmap(page: map->page);
443 break;
444 case ttm_bo_map_premapped:
445 break;
446 default:
447 BUG();
448 }
449 ttm_mem_io_free(bdev: map->bo->bdev, mem: map->bo->resource);
450 map->virtual = NULL;
451 map->page = NULL;
452}
453EXPORT_SYMBOL(ttm_bo_kunmap);
454
455/**
456 * ttm_bo_vmap
457 *
458 * @bo: The buffer object.
459 * @map: pointer to a struct iosys_map representing the map.
460 *
461 * Sets up a kernel virtual mapping, using ioremap or vmap to the
462 * data in the buffer object. The parameter @map returns the virtual
463 * address as struct iosys_map. Unmap the buffer with ttm_bo_vunmap().
464 *
465 * Returns
466 * -ENOMEM: Out of memory.
467 * -EINVAL: Invalid range.
468 */
469int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map)
470{
471 struct ttm_resource *mem = bo->resource;
472 int ret;
473
474 dma_resv_assert_held(bo->base.resv);
475
476 ret = ttm_mem_io_reserve(bdev: bo->bdev, mem);
477 if (ret)
478 return ret;
479
480 if (mem->bus.is_iomem) {
481 void __iomem *vaddr_iomem;
482
483 if (mem->bus.addr)
484 vaddr_iomem = (void __iomem *)mem->bus.addr;
485 else if (mem->bus.caching == ttm_write_combined)
486 vaddr_iomem = ioremap_wc(offset: mem->bus.offset,
487 size: bo->base.size);
488#ifdef CONFIG_X86
489 else if (mem->bus.caching == ttm_cached)
490 vaddr_iomem = ioremap_cache(offset: mem->bus.offset,
491 size: bo->base.size);
492#endif
493 else
494 vaddr_iomem = ioremap(offset: mem->bus.offset, size: bo->base.size);
495
496 if (!vaddr_iomem)
497 return -ENOMEM;
498
499 iosys_map_set_vaddr_iomem(map, vaddr_iomem);
500
501 } else {
502 struct ttm_operation_ctx ctx = {
503 .interruptible = false,
504 .no_wait_gpu = false
505 };
506 struct ttm_tt *ttm = bo->ttm;
507 pgprot_t prot;
508 void *vaddr;
509
510 ret = ttm_tt_populate(bdev: bo->bdev, ttm, ctx: &ctx);
511 if (ret)
512 return ret;
513
514 /*
515 * We need to use vmap to get the desired page protection
516 * or to make the buffer object look contiguous.
517 */
518 prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
519 vaddr = vmap(pages: ttm->pages, count: ttm->num_pages, flags: 0, prot);
520 if (!vaddr)
521 return -ENOMEM;
522
523 iosys_map_set_vaddr(map, vaddr);
524 }
525
526 return 0;
527}
528EXPORT_SYMBOL(ttm_bo_vmap);
529
530/**
531 * ttm_bo_vunmap
532 *
533 * @bo: The buffer object.
534 * @map: Object describing the map to unmap.
535 *
536 * Unmaps a kernel map set up by ttm_bo_vmap().
537 */
538void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map)
539{
540 struct ttm_resource *mem = bo->resource;
541
542 dma_resv_assert_held(bo->base.resv);
543
544 if (iosys_map_is_null(map))
545 return;
546
547 if (!map->is_iomem)
548 vunmap(addr: map->vaddr);
549 else if (!mem->bus.addr)
550 iounmap(addr: map->vaddr_iomem);
551 iosys_map_clear(map);
552
553 ttm_mem_io_free(bdev: bo->bdev, mem: bo->resource);
554}
555EXPORT_SYMBOL(ttm_bo_vunmap);
556
557static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo,
558 bool dst_use_tt)
559{
560 long ret;
561
562 ret = dma_resv_wait_timeout(obj: bo->base.resv, usage: DMA_RESV_USAGE_BOOKKEEP,
563 intr: false, timeout: 15 * HZ);
564 if (ret == 0)
565 return -EBUSY;
566 if (ret < 0)
567 return ret;
568
569 if (!dst_use_tt)
570 ttm_bo_tt_destroy(bo);
571 ttm_resource_free(bo, res: &bo->resource);
572 return 0;
573}
574
575static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo,
576 struct dma_fence *fence,
577 bool dst_use_tt)
578{
579 struct ttm_buffer_object *ghost_obj;
580 int ret;
581
582 /**
583 * This should help pipeline ordinary buffer moves.
584 *
585 * Hang old buffer memory on a new buffer object,
586 * and leave it to be released when the GPU
587 * operation has completed.
588 */
589
590 ret = ttm_buffer_object_transfer(bo, new_obj: &ghost_obj);
591 if (ret)
592 return ret;
593
594 dma_resv_add_fence(obj: &ghost_obj->base._resv, fence,
595 usage: DMA_RESV_USAGE_KERNEL);
596
597 /**
598 * If we're not moving to fixed memory, the TTM object
599 * needs to stay alive. Otherwhise hang it on the ghost
600 * bo to be unbound and destroyed.
601 */
602
603 if (dst_use_tt)
604 ghost_obj->ttm = NULL;
605 else
606 bo->ttm = NULL;
607
608 dma_resv_unlock(obj: &ghost_obj->base._resv);
609 ttm_bo_put(bo: ghost_obj);
610 return 0;
611}
612
613static void ttm_bo_move_pipeline_evict(struct ttm_buffer_object *bo,
614 struct dma_fence *fence)
615{
616 struct ttm_device *bdev = bo->bdev;
617 struct ttm_resource_manager *from;
618
619 from = ttm_manager_type(bdev, mem_type: bo->resource->mem_type);
620
621 /**
622 * BO doesn't have a TTM we need to bind/unbind. Just remember
623 * this eviction and free up the allocation
624 */
625 spin_lock(lock: &from->move_lock);
626 if (!from->move || dma_fence_is_later(f1: fence, f2: from->move)) {
627 dma_fence_put(fence: from->move);
628 from->move = dma_fence_get(fence);
629 }
630 spin_unlock(lock: &from->move_lock);
631
632 ttm_resource_free(bo, res: &bo->resource);
633}
634
635/**
636 * ttm_bo_move_accel_cleanup - cleanup helper for hw copies
637 *
638 * @bo: A pointer to a struct ttm_buffer_object.
639 * @fence: A fence object that signals when moving is complete.
640 * @evict: This is an evict move. Don't return until the buffer is idle.
641 * @pipeline: evictions are to be pipelined.
642 * @new_mem: struct ttm_resource indicating where to move.
643 *
644 * Accelerated move function to be called when an accelerated move
645 * has been scheduled. The function will create a new temporary buffer object
646 * representing the old placement, and put the sync object on both buffer
647 * objects. After that the newly created buffer object is unref'd to be
648 * destroyed when the move is complete. This will help pipeline
649 * buffer moves.
650 */
651int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
652 struct dma_fence *fence,
653 bool evict,
654 bool pipeline,
655 struct ttm_resource *new_mem)
656{
657 struct ttm_device *bdev = bo->bdev;
658 struct ttm_resource_manager *from = ttm_manager_type(bdev, mem_type: bo->resource->mem_type);
659 struct ttm_resource_manager *man = ttm_manager_type(bdev, mem_type: new_mem->mem_type);
660 int ret = 0;
661
662 dma_resv_add_fence(obj: bo->base.resv, fence, usage: DMA_RESV_USAGE_KERNEL);
663 if (!evict)
664 ret = ttm_bo_move_to_ghost(bo, fence, dst_use_tt: man->use_tt);
665 else if (!from->use_tt && pipeline)
666 ttm_bo_move_pipeline_evict(bo, fence);
667 else
668 ret = ttm_bo_wait_free_node(bo, dst_use_tt: man->use_tt);
669
670 if (ret)
671 return ret;
672
673 ttm_bo_assign_mem(bo, new_mem);
674
675 return 0;
676}
677EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
678
679/**
680 * ttm_bo_move_sync_cleanup - cleanup by waiting for the move to finish
681 *
682 * @bo: A pointer to a struct ttm_buffer_object.
683 * @new_mem: struct ttm_resource indicating where to move.
684 *
685 * Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed
686 * by the caller to be idle. Typically used after memcpy buffer moves.
687 */
688void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
689 struct ttm_resource *new_mem)
690{
691 struct ttm_device *bdev = bo->bdev;
692 struct ttm_resource_manager *man = ttm_manager_type(bdev, mem_type: new_mem->mem_type);
693 int ret;
694
695 ret = ttm_bo_wait_free_node(bo, dst_use_tt: man->use_tt);
696 if (WARN_ON(ret))
697 return;
698
699 ttm_bo_assign_mem(bo, new_mem);
700}
701EXPORT_SYMBOL(ttm_bo_move_sync_cleanup);
702
703/**
704 * ttm_bo_pipeline_gutting - purge the contents of a bo
705 * @bo: The buffer object
706 *
707 * Purge the contents of a bo, async if the bo is not idle.
708 * After a successful call, the bo is left unpopulated in
709 * system placement. The function may wait uninterruptible
710 * for idle on OOM.
711 *
712 * Return: 0 if successful, negative error code on failure.
713 */
714int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
715{
716 struct ttm_buffer_object *ghost;
717 struct ttm_tt *ttm;
718 int ret;
719
720 /* If already idle, no need for ghost object dance. */
721 if (dma_resv_test_signaled(obj: bo->base.resv, usage: DMA_RESV_USAGE_BOOKKEEP)) {
722 if (!bo->ttm) {
723 /* See comment below about clearing. */
724 ret = ttm_tt_create(bo, zero_alloc: true);
725 if (ret)
726 return ret;
727 } else {
728 ttm_tt_unpopulate(bdev: bo->bdev, ttm: bo->ttm);
729 if (bo->type == ttm_bo_type_device)
730 ttm_tt_mark_for_clear(ttm: bo->ttm);
731 }
732 ttm_resource_free(bo, res: &bo->resource);
733 return 0;
734 }
735
736 /*
737 * We need an unpopulated ttm_tt after giving our current one,
738 * if any, to the ghost object. And we can't afford to fail
739 * creating one *after* the operation. If the bo subsequently gets
740 * resurrected, make sure it's cleared (if ttm_bo_type_device)
741 * to avoid leaking sensitive information to user-space.
742 */
743
744 ttm = bo->ttm;
745 bo->ttm = NULL;
746 ret = ttm_tt_create(bo, zero_alloc: true);
747 swap(bo->ttm, ttm);
748 if (ret)
749 return ret;
750
751 ret = ttm_buffer_object_transfer(bo, new_obj: &ghost);
752 if (ret)
753 goto error_destroy_tt;
754
755 ret = dma_resv_copy_fences(dst: &ghost->base._resv, src: bo->base.resv);
756 /* Last resort, wait for the BO to be idle when we are OOM */
757 if (ret) {
758 dma_resv_wait_timeout(obj: bo->base.resv, usage: DMA_RESV_USAGE_BOOKKEEP,
759 intr: false, MAX_SCHEDULE_TIMEOUT);
760 }
761
762 dma_resv_unlock(obj: &ghost->base._resv);
763 ttm_bo_put(bo: ghost);
764 bo->ttm = ttm;
765 return 0;
766
767error_destroy_tt:
768 ttm_tt_destroy(bdev: bo->bdev, ttm);
769 return ret;
770}
771

source code of linux/drivers/gpu/drm/ttm/ttm_bo_util.c