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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 <drm/ttm/ttm_bo_driver.h>
33#include <drm/ttm/ttm_placement.h>
34#include <drm/drm_vma_manager.h>
35#include <linux/io.h>
36#include <linux/highmem.h>
37#include <linux/wait.h>
38#include <linux/slab.h>
39#include <linux/vmalloc.h>
40#include <linux/module.h>
41#include <linux/dma-resv.h>
42
43struct ttm_transfer_obj {
44 struct ttm_buffer_object base;
45 struct ttm_buffer_object *bo;
46};
47
48void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
49{
50 ttm_bo_mem_put(bo, &bo->mem);
51}
52
53int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
54 struct ttm_operation_ctx *ctx,
55 struct ttm_mem_reg *new_mem)
56{
57 struct ttm_tt *ttm = bo->ttm;
58 struct ttm_mem_reg *old_mem = &bo->mem;
59 int ret;
60
61 if (old_mem->mem_type != TTM_PL_SYSTEM) {
62 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
63
64 if (unlikely(ret != 0)) {
65 if (ret != -ERESTARTSYS)
66 pr_err("Failed to expire sync object before unbinding TTM\n");
67 return ret;
68 }
69
70 ttm_tt_unbind(ttm);
71 ttm_bo_free_old_node(bo);
72 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
73 TTM_PL_MASK_MEM);
74 old_mem->mem_type = TTM_PL_SYSTEM;
75 }
76
77 ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
78 if (unlikely(ret != 0))
79 return ret;
80
81 if (new_mem->mem_type != TTM_PL_SYSTEM) {
82 ret = ttm_tt_bind(ttm, new_mem, ctx);
83 if (unlikely(ret != 0))
84 return ret;
85 }
86
87 *old_mem = *new_mem;
88 new_mem->mm_node = NULL;
89
90 return 0;
91}
92EXPORT_SYMBOL(ttm_bo_move_ttm);
93
94int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
95{
96 if (likely(man->io_reserve_fastpath))
97 return 0;
98
99 if (interruptible)
100 return mutex_lock_interruptible(&man->io_reserve_mutex);
101
102 mutex_lock(&man->io_reserve_mutex);
103 return 0;
104}
105EXPORT_SYMBOL(ttm_mem_io_lock);
106
107void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
108{
109 if (likely(man->io_reserve_fastpath))
110 return;
111
112 mutex_unlock(&man->io_reserve_mutex);
113}
114EXPORT_SYMBOL(ttm_mem_io_unlock);
115
116static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
117{
118 struct ttm_buffer_object *bo;
119
120 if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
121 return -EAGAIN;
122
123 bo = list_first_entry(&man->io_reserve_lru,
124 struct ttm_buffer_object,
125 io_reserve_lru);
126 list_del_init(&bo->io_reserve_lru);
127 ttm_bo_unmap_virtual_locked(bo);
128
129 return 0;
130}
131
132
133int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
134 struct ttm_mem_reg *mem)
135{
136 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
137 int ret = 0;
138
139 if (!bdev->driver->io_mem_reserve)
140 return 0;
141 if (likely(man->io_reserve_fastpath))
142 return bdev->driver->io_mem_reserve(bdev, mem);
143
144 if (bdev->driver->io_mem_reserve &&
145 mem->bus.io_reserved_count++ == 0) {
146retry:
147 ret = bdev->driver->io_mem_reserve(bdev, mem);
148 if (ret == -EAGAIN) {
149 ret = ttm_mem_io_evict(man);
150 if (ret == 0)
151 goto retry;
152 }
153 }
154 return ret;
155}
156EXPORT_SYMBOL(ttm_mem_io_reserve);
157
158void ttm_mem_io_free(struct ttm_bo_device *bdev,
159 struct ttm_mem_reg *mem)
160{
161 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
162
163 if (likely(man->io_reserve_fastpath))
164 return;
165
166 if (bdev->driver->io_mem_reserve &&
167 --mem->bus.io_reserved_count == 0 &&
168 bdev->driver->io_mem_free)
169 bdev->driver->io_mem_free(bdev, mem);
170
171}
172EXPORT_SYMBOL(ttm_mem_io_free);
173
174int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
175{
176 struct ttm_mem_reg *mem = &bo->mem;
177 int ret;
178
179 if (!mem->bus.io_reserved_vm) {
180 struct ttm_mem_type_manager *man =
181 &bo->bdev->man[mem->mem_type];
182
183 ret = ttm_mem_io_reserve(bo->bdev, mem);
184 if (unlikely(ret != 0))
185 return ret;
186 mem->bus.io_reserved_vm = true;
187 if (man->use_io_reserve_lru)
188 list_add_tail(&bo->io_reserve_lru,
189 &man->io_reserve_lru);
190 }
191 return 0;
192}
193
194void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
195{
196 struct ttm_mem_reg *mem = &bo->mem;
197
198 if (mem->bus.io_reserved_vm) {
199 mem->bus.io_reserved_vm = false;
200 list_del_init(&bo->io_reserve_lru);
201 ttm_mem_io_free(bo->bdev, mem);
202 }
203}
204
205static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
206 void **virtual)
207{
208 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
209 int ret;
210 void *addr;
211
212 *virtual = NULL;
213 (void) ttm_mem_io_lock(man, false);
214 ret = ttm_mem_io_reserve(bdev, mem);
215 ttm_mem_io_unlock(man);
216 if (ret || !mem->bus.is_iomem)
217 return ret;
218
219 if (mem->bus.addr) {
220 addr = mem->bus.addr;
221 } else {
222 if (mem->placement & TTM_PL_FLAG_WC)
223 addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
224 else
225 addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
226 if (!addr) {
227 (void) ttm_mem_io_lock(man, false);
228 ttm_mem_io_free(bdev, mem);
229 ttm_mem_io_unlock(man);
230 return -ENOMEM;
231 }
232 }
233 *virtual = addr;
234 return 0;
235}
236
237static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
238 void *virtual)
239{
240 struct ttm_mem_type_manager *man;
241
242 man = &bdev->man[mem->mem_type];
243
244 if (virtual && mem->bus.addr == NULL)
245 iounmap(virtual);
246 (void) ttm_mem_io_lock(man, false);
247 ttm_mem_io_free(bdev, mem);
248 ttm_mem_io_unlock(man);
249}
250
251static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
252{
253 uint32_t *dstP =
254 (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
255 uint32_t *srcP =
256 (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
257
258 int i;
259 for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
260 iowrite32(ioread32(srcP++), dstP++);
261 return 0;
262}
263
264#ifdef CONFIG_X86
265#define __ttm_kmap_atomic_prot(__page, __prot) kmap_atomic_prot(__page, __prot)
266#define __ttm_kunmap_atomic(__addr) kunmap_atomic(__addr)
267#else
268#define __ttm_kmap_atomic_prot(__page, __prot) vmap(&__page, 1, 0, __prot)
269#define __ttm_kunmap_atomic(__addr) vunmap(__addr)
270#endif
271
272
273/**
274 * ttm_kmap_atomic_prot - Efficient kernel map of a single page with
275 * specified page protection.
276 *
277 * @page: The page to map.
278 * @prot: The page protection.
279 *
280 * This function maps a TTM page using the kmap_atomic api if available,
281 * otherwise falls back to vmap. The user must make sure that the
282 * specified page does not have an aliased mapping with a different caching
283 * policy unless the architecture explicitly allows it. Also mapping and
284 * unmapping using this api must be correctly nested. Unmapping should
285 * occur in the reverse order of mapping.
286 */
287void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot)
288{
289 if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
290 return kmap_atomic(page);
291 else
292 return __ttm_kmap_atomic_prot(page, prot);
293}
294EXPORT_SYMBOL(ttm_kmap_atomic_prot);
295
296/**
297 * ttm_kunmap_atomic_prot - Unmap a page that was mapped using
298 * ttm_kmap_atomic_prot.
299 *
300 * @addr: The virtual address from the map.
301 * @prot: The page protection.
302 */
303void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot)
304{
305 if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
306 kunmap_atomic(addr);
307 else
308 __ttm_kunmap_atomic(addr);
309}
310EXPORT_SYMBOL(ttm_kunmap_atomic_prot);
311
312static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
313 unsigned long page,
314 pgprot_t prot)
315{
316 struct page *d = ttm->pages[page];
317 void *dst;
318
319 if (!d)
320 return -ENOMEM;
321
322 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
323 dst = ttm_kmap_atomic_prot(d, prot);
324 if (!dst)
325 return -ENOMEM;
326
327 memcpy_fromio(dst, src, PAGE_SIZE);
328
329 ttm_kunmap_atomic_prot(dst, prot);
330
331 return 0;
332}
333
334static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
335 unsigned long page,
336 pgprot_t prot)
337{
338 struct page *s = ttm->pages[page];
339 void *src;
340
341 if (!s)
342 return -ENOMEM;
343
344 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
345 src = ttm_kmap_atomic_prot(s, prot);
346 if (!src)
347 return -ENOMEM;
348
349 memcpy_toio(dst, src, PAGE_SIZE);
350
351 ttm_kunmap_atomic_prot(src, prot);
352
353 return 0;
354}
355
356int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
357 struct ttm_operation_ctx *ctx,
358 struct ttm_mem_reg *new_mem)
359{
360 struct ttm_bo_device *bdev = bo->bdev;
361 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
362 struct ttm_tt *ttm = bo->ttm;
363 struct ttm_mem_reg *old_mem = &bo->mem;
364 struct ttm_mem_reg old_copy = *old_mem;
365 void *old_iomap;
366 void *new_iomap;
367 int ret;
368 unsigned long i;
369 unsigned long page;
370 unsigned long add = 0;
371 int dir;
372
373 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
374 if (ret)
375 return ret;
376
377 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
378 if (ret)
379 return ret;
380 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
381 if (ret)
382 goto out;
383
384 /*
385 * Single TTM move. NOP.
386 */
387 if (old_iomap == NULL && new_iomap == NULL)
388 goto out2;
389
390 /*
391 * Don't move nonexistent data. Clear destination instead.
392 */
393 if (old_iomap == NULL &&
394 (ttm == NULL || (ttm->state == tt_unpopulated &&
395 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
396 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
397 goto out2;
398 }
399
400 /*
401 * TTM might be null for moves within the same region.
402 */
403 if (ttm) {
404 ret = ttm_tt_populate(ttm, ctx);
405 if (ret)
406 goto out1;
407 }
408
409 add = 0;
410 dir = 1;
411
412 if ((old_mem->mem_type == new_mem->mem_type) &&
413 (new_mem->start < old_mem->start + old_mem->size)) {
414 dir = -1;
415 add = new_mem->num_pages - 1;
416 }
417
418 for (i = 0; i < new_mem->num_pages; ++i) {
419 page = i * dir + add;
420 if (old_iomap == NULL) {
421 pgprot_t prot = ttm_io_prot(old_mem->placement,
422 PAGE_KERNEL);
423 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
424 prot);
425 } else if (new_iomap == NULL) {
426 pgprot_t prot = ttm_io_prot(new_mem->placement,
427 PAGE_KERNEL);
428 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
429 prot);
430 } else {
431 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
432 }
433 if (ret)
434 goto out1;
435 }
436 mb();
437out2:
438 old_copy = *old_mem;
439 *old_mem = *new_mem;
440 new_mem->mm_node = NULL;
441
442 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
443 ttm_tt_destroy(ttm);
444 bo->ttm = NULL;
445 }
446
447out1:
448 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
449out:
450 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
451
452 /*
453 * On error, keep the mm node!
454 */
455 if (!ret)
456 ttm_bo_mem_put(bo, &old_copy);
457 return ret;
458}
459EXPORT_SYMBOL(ttm_bo_move_memcpy);
460
461static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
462{
463 struct ttm_transfer_obj *fbo;
464
465 fbo = container_of(bo, struct ttm_transfer_obj, base);
466 ttm_bo_put(fbo->bo);
467 kfree(fbo);
468}
469
470/**
471 * ttm_buffer_object_transfer
472 *
473 * @bo: A pointer to a struct ttm_buffer_object.
474 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
475 * holding the data of @bo with the old placement.
476 *
477 * This is a utility function that may be called after an accelerated move
478 * has been scheduled. A new buffer object is created as a placeholder for
479 * the old data while it's being copied. When that buffer object is idle,
480 * it can be destroyed, releasing the space of the old placement.
481 * Returns:
482 * !0: Failure.
483 */
484
485static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
486 struct ttm_buffer_object **new_obj)
487{
488 struct ttm_transfer_obj *fbo;
489 int ret;
490
491 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
492 if (!fbo)
493 return -ENOMEM;
494
495 fbo->base = *bo;
496 fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
497
498 ttm_bo_get(bo);
499 fbo->bo = bo;
500
501 /**
502 * Fix up members that we shouldn't copy directly:
503 * TODO: Explicit member copy would probably be better here.
504 */
505
506 atomic_inc(&bo->bdev->glob->bo_count);
507 INIT_LIST_HEAD(&fbo->base.ddestroy);
508 INIT_LIST_HEAD(&fbo->base.lru);
509 INIT_LIST_HEAD(&fbo->base.swap);
510 INIT_LIST_HEAD(&fbo->base.io_reserve_lru);
511 mutex_init(&fbo->base.wu_mutex);
512 fbo->base.moving = NULL;
513 drm_vma_node_reset(&fbo->base.base.vma_node);
514 atomic_set(&fbo->base.cpu_writers, 0);
515
516 kref_init(&fbo->base.list_kref);
517 kref_init(&fbo->base.kref);
518 fbo->base.destroy = &ttm_transfered_destroy;
519 fbo->base.acc_size = 0;
520 fbo->base.base.resv = &fbo->base.base._resv;
521 dma_resv_init(fbo->base.base.resv);
522 ret = dma_resv_trylock(fbo->base.base.resv);
523 WARN_ON(!ret);
524
525 *new_obj = &fbo->base;
526 return 0;
527}
528
529pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
530{
531 /* Cached mappings need no adjustment */
532 if (caching_flags & TTM_PL_FLAG_CACHED)
533 return tmp;
534
535#if defined(__i386__) || defined(__x86_64__)
536 if (caching_flags & TTM_PL_FLAG_WC)
537 tmp = pgprot_writecombine(tmp);
538 else if (boot_cpu_data.x86 > 3)
539 tmp = pgprot_noncached(tmp);
540#endif
541#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
542 defined(__powerpc__) || defined(__mips__)
543 if (caching_flags & TTM_PL_FLAG_WC)
544 tmp = pgprot_writecombine(tmp);
545 else
546 tmp = pgprot_noncached(tmp);
547#endif
548#if defined(__sparc__)
549 tmp = pgprot_noncached(tmp);
550#endif
551 return tmp;
552}
553EXPORT_SYMBOL(ttm_io_prot);
554
555static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
556 unsigned long offset,
557 unsigned long size,
558 struct ttm_bo_kmap_obj *map)
559{
560 struct ttm_mem_reg *mem = &bo->mem;
561
562 if (bo->mem.bus.addr) {
563 map->bo_kmap_type = ttm_bo_map_premapped;
564 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
565 } else {
566 map->bo_kmap_type = ttm_bo_map_iomap;
567 if (mem->placement & TTM_PL_FLAG_WC)
568 map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
569 size);
570 else
571 map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
572 size);
573 }
574 return (!map->virtual) ? -ENOMEM : 0;
575}
576
577static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
578 unsigned long start_page,
579 unsigned long num_pages,
580 struct ttm_bo_kmap_obj *map)
581{
582 struct ttm_mem_reg *mem = &bo->mem;
583 struct ttm_operation_ctx ctx = {
584 .interruptible = false,
585 .no_wait_gpu = false
586 };
587 struct ttm_tt *ttm = bo->ttm;
588 pgprot_t prot;
589 int ret;
590
591 BUG_ON(!ttm);
592
593 ret = ttm_tt_populate(ttm, &ctx);
594 if (ret)
595 return ret;
596
597 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
598 /*
599 * We're mapping a single page, and the desired
600 * page protection is consistent with the bo.
601 */
602
603 map->bo_kmap_type = ttm_bo_map_kmap;
604 map->page = ttm->pages[start_page];
605 map->virtual = kmap(map->page);
606 } else {
607 /*
608 * We need to use vmap to get the desired page protection
609 * or to make the buffer object look contiguous.
610 */
611 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
612 map->bo_kmap_type = ttm_bo_map_vmap;
613 map->virtual = vmap(ttm->pages + start_page, num_pages,
614 0, prot);
615 }
616 return (!map->virtual) ? -ENOMEM : 0;
617}
618
619int ttm_bo_kmap(struct ttm_buffer_object *bo,
620 unsigned long start_page, unsigned long num_pages,
621 struct ttm_bo_kmap_obj *map)
622{
623 struct ttm_mem_type_manager *man =
624 &bo->bdev->man[bo->mem.mem_type];
625 unsigned long offset, size;
626 int ret;
627
628 map->virtual = NULL;
629 map->bo = bo;
630 if (num_pages > bo->num_pages)
631 return -EINVAL;
632 if (start_page > bo->num_pages)
633 return -EINVAL;
634
635 (void) ttm_mem_io_lock(man, false);
636 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
637 ttm_mem_io_unlock(man);
638 if (ret)
639 return ret;
640 if (!bo->mem.bus.is_iomem) {
641 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
642 } else {
643 offset = start_page << PAGE_SHIFT;
644 size = num_pages << PAGE_SHIFT;
645 return ttm_bo_ioremap(bo, offset, size, map);
646 }
647}
648EXPORT_SYMBOL(ttm_bo_kmap);
649
650void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
651{
652 struct ttm_buffer_object *bo = map->bo;
653 struct ttm_mem_type_manager *man =
654 &bo->bdev->man[bo->mem.mem_type];
655
656 if (!map->virtual)
657 return;
658 switch (map->bo_kmap_type) {
659 case ttm_bo_map_iomap:
660 iounmap(map->virtual);
661 break;
662 case ttm_bo_map_vmap:
663 vunmap(map->virtual);
664 break;
665 case ttm_bo_map_kmap:
666 kunmap(map->page);
667 break;
668 case ttm_bo_map_premapped:
669 break;
670 default:
671 BUG();
672 }
673 (void) ttm_mem_io_lock(man, false);
674 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
675 ttm_mem_io_unlock(man);
676 map->virtual = NULL;
677 map->page = NULL;
678}
679EXPORT_SYMBOL(ttm_bo_kunmap);
680
681int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
682 struct dma_fence *fence,
683 bool evict,
684 struct ttm_mem_reg *new_mem)
685{
686 struct ttm_bo_device *bdev = bo->bdev;
687 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
688 struct ttm_mem_reg *old_mem = &bo->mem;
689 int ret;
690 struct ttm_buffer_object *ghost_obj;
691
692 dma_resv_add_excl_fence(bo->base.resv, fence);
693 if (evict) {
694 ret = ttm_bo_wait(bo, false, false);
695 if (ret)
696 return ret;
697
698 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
699 ttm_tt_destroy(bo->ttm);
700 bo->ttm = NULL;
701 }
702 ttm_bo_free_old_node(bo);
703 } else {
704 /**
705 * This should help pipeline ordinary buffer moves.
706 *
707 * Hang old buffer memory on a new buffer object,
708 * and leave it to be released when the GPU
709 * operation has completed.
710 */
711
712 dma_fence_put(bo->moving);
713 bo->moving = dma_fence_get(fence);
714
715 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
716 if (ret)
717 return ret;
718
719 dma_resv_add_excl_fence(ghost_obj->base.resv, fence);
720
721 /**
722 * If we're not moving to fixed memory, the TTM object
723 * needs to stay alive. Otherwhise hang it on the ghost
724 * bo to be unbound and destroyed.
725 */
726
727 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
728 ghost_obj->ttm = NULL;
729 else
730 bo->ttm = NULL;
731
732 ttm_bo_unreserve(ghost_obj);
733 ttm_bo_put(ghost_obj);
734 }
735
736 *old_mem = *new_mem;
737 new_mem->mm_node = NULL;
738
739 return 0;
740}
741EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
742
743int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
744 struct dma_fence *fence, bool evict,
745 struct ttm_mem_reg *new_mem)
746{
747 struct ttm_bo_device *bdev = bo->bdev;
748 struct ttm_mem_reg *old_mem = &bo->mem;
749
750 struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
751 struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
752
753 int ret;
754
755 dma_resv_add_excl_fence(bo->base.resv, fence);
756
757 if (!evict) {
758 struct ttm_buffer_object *ghost_obj;
759
760 /**
761 * This should help pipeline ordinary buffer moves.
762 *
763 * Hang old buffer memory on a new buffer object,
764 * and leave it to be released when the GPU
765 * operation has completed.
766 */
767
768 dma_fence_put(bo->moving);
769 bo->moving = dma_fence_get(fence);
770
771 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
772 if (ret)
773 return ret;
774
775 dma_resv_add_excl_fence(ghost_obj->base.resv, fence);
776
777 /**
778 * If we're not moving to fixed memory, the TTM object
779 * needs to stay alive. Otherwhise hang it on the ghost
780 * bo to be unbound and destroyed.
781 */
782
783 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
784 ghost_obj->ttm = NULL;
785 else
786 bo->ttm = NULL;
787
788 ttm_bo_unreserve(ghost_obj);
789 ttm_bo_put(ghost_obj);
790
791 } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
792
793 /**
794 * BO doesn't have a TTM we need to bind/unbind. Just remember
795 * this eviction and free up the allocation
796 */
797
798 spin_lock(&from->move_lock);
799 if (!from->move || dma_fence_is_later(fence, from->move)) {
800 dma_fence_put(from->move);
801 from->move = dma_fence_get(fence);
802 }
803 spin_unlock(&from->move_lock);
804
805 ttm_bo_free_old_node(bo);
806
807 dma_fence_put(bo->moving);
808 bo->moving = dma_fence_get(fence);
809
810 } else {
811 /**
812 * Last resort, wait for the move to be completed.
813 *
814 * Should never happen in pratice.
815 */
816
817 ret = ttm_bo_wait(bo, false, false);
818 if (ret)
819 return ret;
820
821 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
822 ttm_tt_destroy(bo->ttm);
823 bo->ttm = NULL;
824 }
825 ttm_bo_free_old_node(bo);
826 }
827
828 *old_mem = *new_mem;
829 new_mem->mm_node = NULL;
830
831 return 0;
832}
833EXPORT_SYMBOL(ttm_bo_pipeline_move);
834
835int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
836{
837 struct ttm_buffer_object *ghost;
838 int ret;
839
840 ret = ttm_buffer_object_transfer(bo, &ghost);
841 if (ret)
842 return ret;
843
844 ret = dma_resv_copy_fences(ghost->base.resv, bo->base.resv);
845 /* Last resort, wait for the BO to be idle when we are OOM */
846 if (ret)
847 ttm_bo_wait(bo, false, false);
848
849 memset(&bo->mem, 0, sizeof(bo->mem));
850 bo->mem.mem_type = TTM_PL_SYSTEM;
851 bo->ttm = NULL;
852
853 ttm_bo_unreserve(ghost);
854 ttm_bo_put(ghost);
855
856 return 0;
857}
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 <drm/ttm/ttm_bo_driver.h>
33#include <drm/ttm/ttm_placement.h>
34#include <drm/drm_cache.h>
35#include <drm/drm_vma_manager.h>
36#include <linux/dma-buf-map.h>
37#include <linux/io.h>
38#include <linux/highmem.h>
39#include <linux/wait.h>
40#include <linux/slab.h>
41#include <linux/vmalloc.h>
42#include <linux/module.h>
43#include <linux/dma-resv.h>
44
45struct ttm_transfer_obj {
46 struct ttm_buffer_object base;
47 struct ttm_buffer_object *bo;
48};
49
50int ttm_mem_io_reserve(struct ttm_device *bdev,
51 struct ttm_resource *mem)
52{
53 if (mem->bus.offset || mem->bus.addr)
54 return 0;
55
56 mem->bus.is_iomem = false;
57 if (!bdev->funcs->io_mem_reserve)
58 return 0;
59
60 return bdev->funcs->io_mem_reserve(bdev, mem);
61}
62
63void ttm_mem_io_free(struct ttm_device *bdev,
64 struct ttm_resource *mem)
65{
66 if (!mem)
67 return;
68
69 if (!mem->bus.offset && !mem->bus.addr)
70 return;
71
72 if (bdev->funcs->io_mem_free)
73 bdev->funcs->io_mem_free(bdev, mem);
74
75 mem->bus.offset = 0;
76 mem->bus.addr = NULL;
77}
78
79/**
80 * ttm_move_memcpy - Helper to perform a memcpy ttm move operation.
81 * @bo: The struct ttm_buffer_object.
82 * @new_mem: The struct ttm_resource we're moving to (copy destination).
83 * @new_iter: A struct ttm_kmap_iter representing the destination resource.
84 * @src_iter: A struct ttm_kmap_iter representing the source resource.
85 *
86 * This function is intended to be able to move out async under a
87 * dma-fence if desired.
88 */
89void ttm_move_memcpy(struct ttm_buffer_object *bo,
90 u32 num_pages,
91 struct ttm_kmap_iter *dst_iter,
92 struct ttm_kmap_iter *src_iter)
93{
94 const struct ttm_kmap_iter_ops *dst_ops = dst_iter->ops;
95 const struct ttm_kmap_iter_ops *src_ops = src_iter->ops;
96 struct ttm_tt *ttm = bo->ttm;
97 struct dma_buf_map src_map, dst_map;
98 pgoff_t i;
99
100 /* Single TTM move. NOP */
101 if (dst_ops->maps_tt && src_ops->maps_tt)
102 return;
103
104 /* Don't move nonexistent data. Clear destination instead. */
105 if (src_ops->maps_tt && (!ttm || !ttm_tt_is_populated(ttm))) {
106 if (ttm && !(ttm->page_flags & TTM_PAGE_FLAG_ZERO_ALLOC))
107 return;
108
109 for (i = 0; i < num_pages; ++i) {
110 dst_ops->map_local(dst_iter, &dst_map, i);
111 if (dst_map.is_iomem)
112 memset_io(dst_map.vaddr_iomem, 0, PAGE_SIZE);
113 else
114 memset(dst_map.vaddr, 0, PAGE_SIZE);
115 if (dst_ops->unmap_local)
116 dst_ops->unmap_local(dst_iter, &dst_map);
117 }
118 return;
119 }
120
121 for (i = 0; i < num_pages; ++i) {
122 dst_ops->map_local(dst_iter, &dst_map, i);
123 src_ops->map_local(src_iter, &src_map, i);
124
125 drm_memcpy_from_wc(&dst_map, &src_map, PAGE_SIZE);
126
127 if (src_ops->unmap_local)
128 src_ops->unmap_local(src_iter, &src_map);
129 if (dst_ops->unmap_local)
130 dst_ops->unmap_local(dst_iter, &dst_map);
131 }
132}
133EXPORT_SYMBOL(ttm_move_memcpy);
134
135int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
136 struct ttm_operation_ctx *ctx,
137 struct ttm_resource *dst_mem)
138{
139 struct ttm_device *bdev = bo->bdev;
140 struct ttm_resource_manager *dst_man =
141 ttm_manager_type(bo->bdev, dst_mem->mem_type);
142 struct ttm_tt *ttm = bo->ttm;
143 struct ttm_resource *src_mem = bo->resource;
144 struct ttm_resource_manager *src_man =
145 ttm_manager_type(bdev, src_mem->mem_type);
146 union {
147 struct ttm_kmap_iter_tt tt;
148 struct ttm_kmap_iter_linear_io io;
149 } _dst_iter, _src_iter;
150 struct ttm_kmap_iter *dst_iter, *src_iter;
151 int ret = 0;
152
153 if (ttm && ((ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) ||
154 dst_man->use_tt)) {
155 ret = ttm_tt_populate(bdev, ttm, ctx);
156 if (ret)
157 return ret;
158 }
159
160 dst_iter = ttm_kmap_iter_linear_io_init(&_dst_iter.io, bdev, dst_mem);
161 if (PTR_ERR(dst_iter) == -EINVAL && dst_man->use_tt)
162 dst_iter = ttm_kmap_iter_tt_init(&_dst_iter.tt, bo->ttm);
163 if (IS_ERR(dst_iter))
164 return PTR_ERR(dst_iter);
165
166 src_iter = ttm_kmap_iter_linear_io_init(&_src_iter.io, bdev, src_mem);
167 if (PTR_ERR(src_iter) == -EINVAL && src_man->use_tt)
168 src_iter = ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm);
169 if (IS_ERR(src_iter)) {
170 ret = PTR_ERR(src_iter);
171 goto out_src_iter;
172 }
173
174 ttm_move_memcpy(bo, dst_mem->num_pages, dst_iter, src_iter);
175
176 if (!src_iter->ops->maps_tt)
177 ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, src_mem);
178 ttm_bo_move_sync_cleanup(bo, dst_mem);
179
180out_src_iter:
181 if (!dst_iter->ops->maps_tt)
182 ttm_kmap_iter_linear_io_fini(&_dst_iter.io, bdev, dst_mem);
183
184 return ret;
185}
186EXPORT_SYMBOL(ttm_bo_move_memcpy);
187
188static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
189{
190 struct ttm_transfer_obj *fbo;
191
192 fbo = container_of(bo, struct ttm_transfer_obj, base);
193 ttm_bo_put(fbo->bo);
194 kfree(fbo);
195}
196
197/**
198 * ttm_buffer_object_transfer
199 *
200 * @bo: A pointer to a struct ttm_buffer_object.
201 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
202 * holding the data of @bo with the old placement.
203 *
204 * This is a utility function that may be called after an accelerated move
205 * has been scheduled. A new buffer object is created as a placeholder for
206 * the old data while it's being copied. When that buffer object is idle,
207 * it can be destroyed, releasing the space of the old placement.
208 * Returns:
209 * !0: Failure.
210 */
211
212static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
213 struct ttm_buffer_object **new_obj)
214{
215 struct ttm_transfer_obj *fbo;
216 int ret;
217
218 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
219 if (!fbo)
220 return -ENOMEM;
221
222 fbo->base = *bo;
223
224 ttm_bo_get(bo);
225 fbo->bo = bo;
226
227 /**
228 * Fix up members that we shouldn't copy directly:
229 * TODO: Explicit member copy would probably be better here.
230 */
231
232 atomic_inc(&ttm_glob.bo_count);
233 INIT_LIST_HEAD(&fbo->base.ddestroy);
234 INIT_LIST_HEAD(&fbo->base.lru);
235 fbo->base.moving = NULL;
236 drm_vma_node_reset(&fbo->base.base.vma_node);
237
238 kref_init(&fbo->base.kref);
239 fbo->base.destroy = &ttm_transfered_destroy;
240 fbo->base.pin_count = 0;
241 if (bo->type != ttm_bo_type_sg)
242 fbo->base.base.resv = &fbo->base.base._resv;
243
244 dma_resv_init(&fbo->base.base._resv);
245 fbo->base.base.dev = NULL;
246 ret = dma_resv_trylock(&fbo->base.base._resv);
247 WARN_ON(!ret);
248
249 ttm_bo_move_to_lru_tail_unlocked(&fbo->base);
250
251 *new_obj = &fbo->base;
252 return 0;
253}
254
255pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
256 pgprot_t tmp)
257{
258 struct ttm_resource_manager *man;
259 enum ttm_caching caching;
260
261 man = ttm_manager_type(bo->bdev, res->mem_type);
262 caching = man->use_tt ? bo->ttm->caching : res->bus.caching;
263
264 return ttm_prot_from_caching(caching, tmp);
265}
266EXPORT_SYMBOL(ttm_io_prot);
267
268static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
269 unsigned long offset,
270 unsigned long size,
271 struct ttm_bo_kmap_obj *map)
272{
273 struct ttm_resource *mem = bo->resource;
274
275 if (bo->resource->bus.addr) {
276 map->bo_kmap_type = ttm_bo_map_premapped;
277 map->virtual = ((u8 *)bo->resource->bus.addr) + offset;
278 } else {
279 resource_size_t res = bo->resource->bus.offset + offset;
280
281 map->bo_kmap_type = ttm_bo_map_iomap;
282 if (mem->bus.caching == ttm_write_combined)
283 map->virtual = ioremap_wc(res, size);
284#ifdef CONFIG_X86
285 else if (mem->bus.caching == ttm_cached)
286 map->virtual = ioremap_cache(res, size);
287#endif
288 else
289 map->virtual = ioremap(res, size);
290 }
291 return (!map->virtual) ? -ENOMEM : 0;
292}
293
294static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
295 unsigned long start_page,
296 unsigned long num_pages,
297 struct ttm_bo_kmap_obj *map)
298{
299 struct ttm_resource *mem = bo->resource;
300 struct ttm_operation_ctx ctx = {
301 .interruptible = false,
302 .no_wait_gpu = false
303 };
304 struct ttm_tt *ttm = bo->ttm;
305 pgprot_t prot;
306 int ret;
307
308 BUG_ON(!ttm);
309
310 ret = ttm_tt_populate(bo->bdev, ttm, &ctx);
311 if (ret)
312 return ret;
313
314 if (num_pages == 1 && ttm->caching == ttm_cached) {
315 /*
316 * We're mapping a single page, and the desired
317 * page protection is consistent with the bo.
318 */
319
320 map->bo_kmap_type = ttm_bo_map_kmap;
321 map->page = ttm->pages[start_page];
322 map->virtual = kmap(map->page);
323 } else {
324 /*
325 * We need to use vmap to get the desired page protection
326 * or to make the buffer object look contiguous.
327 */
328 prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
329 map->bo_kmap_type = ttm_bo_map_vmap;
330 map->virtual = vmap(ttm->pages + start_page, num_pages,
331 0, prot);
332 }
333 return (!map->virtual) ? -ENOMEM : 0;
334}
335
336int ttm_bo_kmap(struct ttm_buffer_object *bo,
337 unsigned long start_page, unsigned long num_pages,
338 struct ttm_bo_kmap_obj *map)
339{
340 unsigned long offset, size;
341 int ret;
342
343 map->virtual = NULL;
344 map->bo = bo;
345 if (num_pages > bo->resource->num_pages)
346 return -EINVAL;
347 if ((start_page + num_pages) > bo->resource->num_pages)
348 return -EINVAL;
349
350 ret = ttm_mem_io_reserve(bo->bdev, bo->resource);
351 if (ret)
352 return ret;
353 if (!bo->resource->bus.is_iomem) {
354 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
355 } else {
356 offset = start_page << PAGE_SHIFT;
357 size = num_pages << PAGE_SHIFT;
358 return ttm_bo_ioremap(bo, offset, size, map);
359 }
360}
361EXPORT_SYMBOL(ttm_bo_kmap);
362
363void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
364{
365 if (!map->virtual)
366 return;
367 switch (map->bo_kmap_type) {
368 case ttm_bo_map_iomap:
369 iounmap(map->virtual);
370 break;
371 case ttm_bo_map_vmap:
372 vunmap(map->virtual);
373 break;
374 case ttm_bo_map_kmap:
375 kunmap(map->page);
376 break;
377 case ttm_bo_map_premapped:
378 break;
379 default:
380 BUG();
381 }
382 ttm_mem_io_free(map->bo->bdev, map->bo->resource);
383 map->virtual = NULL;
384 map->page = NULL;
385}
386EXPORT_SYMBOL(ttm_bo_kunmap);
387
388int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_map *map)
389{
390 struct ttm_resource *mem = bo->resource;
391 int ret;
392
393 ret = ttm_mem_io_reserve(bo->bdev, mem);
394 if (ret)
395 return ret;
396
397 if (mem->bus.is_iomem) {
398 void __iomem *vaddr_iomem;
399
400 if (mem->bus.addr)
401 vaddr_iomem = (void __iomem *)mem->bus.addr;
402 else if (mem->bus.caching == ttm_write_combined)
403 vaddr_iomem = ioremap_wc(mem->bus.offset,
404 bo->base.size);
405#ifdef CONFIG_X86
406 else if (mem->bus.caching == ttm_cached)
407 vaddr_iomem = ioremap_cache(mem->bus.offset,
408 bo->base.size);
409#endif
410 else
411 vaddr_iomem = ioremap(mem->bus.offset, bo->base.size);
412
413 if (!vaddr_iomem)
414 return -ENOMEM;
415
416 dma_buf_map_set_vaddr_iomem(map, vaddr_iomem);
417
418 } else {
419 struct ttm_operation_ctx ctx = {
420 .interruptible = false,
421 .no_wait_gpu = false
422 };
423 struct ttm_tt *ttm = bo->ttm;
424 pgprot_t prot;
425 void *vaddr;
426
427 ret = ttm_tt_populate(bo->bdev, ttm, &ctx);
428 if (ret)
429 return ret;
430
431 /*
432 * We need to use vmap to get the desired page protection
433 * or to make the buffer object look contiguous.
434 */
435 prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
436 vaddr = vmap(ttm->pages, ttm->num_pages, 0, prot);
437 if (!vaddr)
438 return -ENOMEM;
439
440 dma_buf_map_set_vaddr(map, vaddr);
441 }
442
443 return 0;
444}
445EXPORT_SYMBOL(ttm_bo_vmap);
446
447void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct dma_buf_map *map)
448{
449 struct ttm_resource *mem = bo->resource;
450
451 if (dma_buf_map_is_null(map))
452 return;
453
454 if (!map->is_iomem)
455 vunmap(map->vaddr);
456 else if (!mem->bus.addr)
457 iounmap(map->vaddr_iomem);
458 dma_buf_map_clear(map);
459
460 ttm_mem_io_free(bo->bdev, bo->resource);
461}
462EXPORT_SYMBOL(ttm_bo_vunmap);
463
464static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo,
465 bool dst_use_tt)
466{
467 int ret;
468 ret = ttm_bo_wait(bo, false, false);
469 if (ret)
470 return ret;
471
472 if (!dst_use_tt)
473 ttm_bo_tt_destroy(bo);
474 ttm_resource_free(bo, &bo->resource);
475 return 0;
476}
477
478static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo,
479 struct dma_fence *fence,
480 bool dst_use_tt)
481{
482 struct ttm_buffer_object *ghost_obj;
483 int ret;
484
485 /**
486 * This should help pipeline ordinary buffer moves.
487 *
488 * Hang old buffer memory on a new buffer object,
489 * and leave it to be released when the GPU
490 * operation has completed.
491 */
492
493 dma_fence_put(bo->moving);
494 bo->moving = dma_fence_get(fence);
495
496 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
497 if (ret)
498 return ret;
499
500 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
501
502 /**
503 * If we're not moving to fixed memory, the TTM object
504 * needs to stay alive. Otherwhise hang it on the ghost
505 * bo to be unbound and destroyed.
506 */
507
508 if (dst_use_tt)
509 ghost_obj->ttm = NULL;
510 else
511 bo->ttm = NULL;
512 bo->resource = NULL;
513
514 dma_resv_unlock(&ghost_obj->base._resv);
515 ttm_bo_put(ghost_obj);
516 return 0;
517}
518
519static void ttm_bo_move_pipeline_evict(struct ttm_buffer_object *bo,
520 struct dma_fence *fence)
521{
522 struct ttm_device *bdev = bo->bdev;
523 struct ttm_resource_manager *from;
524
525 from = ttm_manager_type(bdev, bo->resource->mem_type);
526
527 /**
528 * BO doesn't have a TTM we need to bind/unbind. Just remember
529 * this eviction and free up the allocation
530 */
531 spin_lock(&from->move_lock);
532 if (!from->move || dma_fence_is_later(fence, from->move)) {
533 dma_fence_put(from->move);
534 from->move = dma_fence_get(fence);
535 }
536 spin_unlock(&from->move_lock);
537
538 ttm_resource_free(bo, &bo->resource);
539
540 dma_fence_put(bo->moving);
541 bo->moving = dma_fence_get(fence);
542}
543
544int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
545 struct dma_fence *fence,
546 bool evict,
547 bool pipeline,
548 struct ttm_resource *new_mem)
549{
550 struct ttm_device *bdev = bo->bdev;
551 struct ttm_resource_manager *from = ttm_manager_type(bdev, bo->resource->mem_type);
552 struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
553 int ret = 0;
554
555 dma_resv_add_excl_fence(bo->base.resv, fence);
556 if (!evict)
557 ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt);
558 else if (!from->use_tt && pipeline)
559 ttm_bo_move_pipeline_evict(bo, fence);
560 else
561 ret = ttm_bo_wait_free_node(bo, man->use_tt);
562
563 if (ret)
564 return ret;
565
566 ttm_bo_assign_mem(bo, new_mem);
567
568 return 0;
569}
570EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
571
572/**
573 * ttm_bo_pipeline_gutting - purge the contents of a bo
574 * @bo: The buffer object
575 *
576 * Purge the contents of a bo, async if the bo is not idle.
577 * After a successful call, the bo is left unpopulated in
578 * system placement. The function may wait uninterruptible
579 * for idle on OOM.
580 *
581 * Return: 0 if successful, negative error code on failure.
582 */
583int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
584{
585 static const struct ttm_place sys_mem = { .mem_type = TTM_PL_SYSTEM };
586 struct ttm_buffer_object *ghost;
587 struct ttm_resource *sys_res;
588 struct ttm_tt *ttm;
589 int ret;
590
591 ret = ttm_resource_alloc(bo, &sys_mem, &sys_res);
592 if (ret)
593 return ret;
594
595 /* If already idle, no need for ghost object dance. */
596 ret = ttm_bo_wait(bo, false, true);
597 if (ret != -EBUSY) {
598 if (!bo->ttm) {
599 /* See comment below about clearing. */
600 ret = ttm_tt_create(bo, true);
601 if (ret)
602 goto error_free_sys_mem;
603 } else {
604 ttm_tt_unpopulate(bo->bdev, bo->ttm);
605 if (bo->type == ttm_bo_type_device)
606 ttm_tt_mark_for_clear(bo->ttm);
607 }
608 ttm_resource_free(bo, &bo->resource);
609 ttm_bo_assign_mem(bo, sys_res);
610 return 0;
611 }
612
613 /*
614 * We need an unpopulated ttm_tt after giving our current one,
615 * if any, to the ghost object. And we can't afford to fail
616 * creating one *after* the operation. If the bo subsequently gets
617 * resurrected, make sure it's cleared (if ttm_bo_type_device)
618 * to avoid leaking sensitive information to user-space.
619 */
620
621 ttm = bo->ttm;
622 bo->ttm = NULL;
623 ret = ttm_tt_create(bo, true);
624 swap(bo->ttm, ttm);
625 if (ret)
626 goto error_free_sys_mem;
627
628 ret = ttm_buffer_object_transfer(bo, &ghost);
629 if (ret)
630 goto error_destroy_tt;
631
632 ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
633 /* Last resort, wait for the BO to be idle when we are OOM */
634 if (ret)
635 ttm_bo_wait(bo, false, false);
636
637 dma_resv_unlock(&ghost->base._resv);
638 ttm_bo_put(ghost);
639 bo->ttm = ttm;
640 bo->resource = NULL;
641 ttm_bo_assign_mem(bo, sys_res);
642 return 0;
643
644error_destroy_tt:
645 ttm_tt_destroy(bo->bdev, ttm);
646
647error_free_sys_mem:
648 ttm_resource_free(bo, &sys_res);
649 return ret;
650}