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1/**************************************************************************
2 *
3 * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31#include <drm/ttm/ttm_bo_driver.h>
32#include <drm/ttm/ttm_placement.h>
33#include <drm/drm_vma_manager.h>
34#include <linux/io.h>
35#include <linux/highmem.h>
36#include <linux/wait.h>
37#include <linux/slab.h>
38#include <linux/vmalloc.h>
39#include <linux/module.h>
40#include <linux/reservation.h>
41
42void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
43{
44 ttm_bo_mem_put(bo, &bo->mem);
45}
46
47int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
48 bool evict,
49 bool no_wait_gpu, struct ttm_mem_reg *new_mem)
50{
51 struct ttm_tt *ttm = bo->ttm;
52 struct ttm_mem_reg *old_mem = &bo->mem;
53 int ret;
54
55 if (old_mem->mem_type != TTM_PL_SYSTEM) {
56 ttm_tt_unbind(ttm);
57 ttm_bo_free_old_node(bo);
58 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
59 TTM_PL_MASK_MEM);
60 old_mem->mem_type = TTM_PL_SYSTEM;
61 }
62
63 ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
64 if (unlikely(ret != 0))
65 return ret;
66
67 if (new_mem->mem_type != TTM_PL_SYSTEM) {
68 ret = ttm_tt_bind(ttm, new_mem);
69 if (unlikely(ret != 0))
70 return ret;
71 }
72
73 *old_mem = *new_mem;
74 new_mem->mm_node = NULL;
75
76 return 0;
77}
78EXPORT_SYMBOL(ttm_bo_move_ttm);
79
80int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
81{
82 if (likely(man->io_reserve_fastpath))
83 return 0;
84
85 if (interruptible)
86 return mutex_lock_interruptible(&man->io_reserve_mutex);
87
88 mutex_lock(&man->io_reserve_mutex);
89 return 0;
90}
91EXPORT_SYMBOL(ttm_mem_io_lock);
92
93void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
94{
95 if (likely(man->io_reserve_fastpath))
96 return;
97
98 mutex_unlock(&man->io_reserve_mutex);
99}
100EXPORT_SYMBOL(ttm_mem_io_unlock);
101
102static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
103{
104 struct ttm_buffer_object *bo;
105
106 if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
107 return -EAGAIN;
108
109 bo = list_first_entry(&man->io_reserve_lru,
110 struct ttm_buffer_object,
111 io_reserve_lru);
112 list_del_init(&bo->io_reserve_lru);
113 ttm_bo_unmap_virtual_locked(bo);
114
115 return 0;
116}
117
118
119int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
120 struct ttm_mem_reg *mem)
121{
122 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
123 int ret = 0;
124
125 if (!bdev->driver->io_mem_reserve)
126 return 0;
127 if (likely(man->io_reserve_fastpath))
128 return bdev->driver->io_mem_reserve(bdev, mem);
129
130 if (bdev->driver->io_mem_reserve &&
131 mem->bus.io_reserved_count++ == 0) {
132retry:
133 ret = bdev->driver->io_mem_reserve(bdev, mem);
134 if (ret == -EAGAIN) {
135 ret = ttm_mem_io_evict(man);
136 if (ret == 0)
137 goto retry;
138 }
139 }
140 return ret;
141}
142EXPORT_SYMBOL(ttm_mem_io_reserve);
143
144void ttm_mem_io_free(struct ttm_bo_device *bdev,
145 struct ttm_mem_reg *mem)
146{
147 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
148
149 if (likely(man->io_reserve_fastpath))
150 return;
151
152 if (bdev->driver->io_mem_reserve &&
153 --mem->bus.io_reserved_count == 0 &&
154 bdev->driver->io_mem_free)
155 bdev->driver->io_mem_free(bdev, mem);
156
157}
158EXPORT_SYMBOL(ttm_mem_io_free);
159
160int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
161{
162 struct ttm_mem_reg *mem = &bo->mem;
163 int ret;
164
165 if (!mem->bus.io_reserved_vm) {
166 struct ttm_mem_type_manager *man =
167 &bo->bdev->man[mem->mem_type];
168
169 ret = ttm_mem_io_reserve(bo->bdev, mem);
170 if (unlikely(ret != 0))
171 return ret;
172 mem->bus.io_reserved_vm = true;
173 if (man->use_io_reserve_lru)
174 list_add_tail(&bo->io_reserve_lru,
175 &man->io_reserve_lru);
176 }
177 return 0;
178}
179
180void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
181{
182 struct ttm_mem_reg *mem = &bo->mem;
183
184 if (mem->bus.io_reserved_vm) {
185 mem->bus.io_reserved_vm = false;
186 list_del_init(&bo->io_reserve_lru);
187 ttm_mem_io_free(bo->bdev, mem);
188 }
189}
190
191static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
192 void **virtual)
193{
194 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
195 int ret;
196 void *addr;
197
198 *virtual = NULL;
199 (void) ttm_mem_io_lock(man, false);
200 ret = ttm_mem_io_reserve(bdev, mem);
201 ttm_mem_io_unlock(man);
202 if (ret || !mem->bus.is_iomem)
203 return ret;
204
205 if (mem->bus.addr) {
206 addr = mem->bus.addr;
207 } else {
208 if (mem->placement & TTM_PL_FLAG_WC)
209 addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
210 else
211 addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
212 if (!addr) {
213 (void) ttm_mem_io_lock(man, false);
214 ttm_mem_io_free(bdev, mem);
215 ttm_mem_io_unlock(man);
216 return -ENOMEM;
217 }
218 }
219 *virtual = addr;
220 return 0;
221}
222
223static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
224 void *virtual)
225{
226 struct ttm_mem_type_manager *man;
227
228 man = &bdev->man[mem->mem_type];
229
230 if (virtual && mem->bus.addr == NULL)
231 iounmap(virtual);
232 (void) ttm_mem_io_lock(man, false);
233 ttm_mem_io_free(bdev, mem);
234 ttm_mem_io_unlock(man);
235}
236
237static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
238{
239 uint32_t *dstP =
240 (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
241 uint32_t *srcP =
242 (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
243
244 int i;
245 for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
246 iowrite32(ioread32(srcP++), dstP++);
247 return 0;
248}
249
250static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
251 unsigned long page,
252 pgprot_t prot)
253{
254 struct page *d = ttm->pages[page];
255 void *dst;
256
257 if (!d)
258 return -ENOMEM;
259
260 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
261
262#ifdef CONFIG_X86
263 dst = kmap_atomic_prot(d, prot);
264#else
265 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
266 dst = vmap(&d, 1, 0, prot);
267 else
268 dst = kmap(d);
269#endif
270 if (!dst)
271 return -ENOMEM;
272
273 memcpy_fromio(dst, src, PAGE_SIZE);
274
275#ifdef CONFIG_X86
276 kunmap_atomic(dst);
277#else
278 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
279 vunmap(dst);
280 else
281 kunmap(d);
282#endif
283
284 return 0;
285}
286
287static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
288 unsigned long page,
289 pgprot_t prot)
290{
291 struct page *s = ttm->pages[page];
292 void *src;
293
294 if (!s)
295 return -ENOMEM;
296
297 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
298#ifdef CONFIG_X86
299 src = kmap_atomic_prot(s, prot);
300#else
301 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
302 src = vmap(&s, 1, 0, prot);
303 else
304 src = kmap(s);
305#endif
306 if (!src)
307 return -ENOMEM;
308
309 memcpy_toio(dst, src, PAGE_SIZE);
310
311#ifdef CONFIG_X86
312 kunmap_atomic(src);
313#else
314 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
315 vunmap(src);
316 else
317 kunmap(s);
318#endif
319
320 return 0;
321}
322
323int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
324 bool evict, bool no_wait_gpu,
325 struct ttm_mem_reg *new_mem)
326{
327 struct ttm_bo_device *bdev = bo->bdev;
328 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
329 struct ttm_tt *ttm = bo->ttm;
330 struct ttm_mem_reg *old_mem = &bo->mem;
331 struct ttm_mem_reg old_copy = *old_mem;
332 void *old_iomap;
333 void *new_iomap;
334 int ret;
335 unsigned long i;
336 unsigned long page;
337 unsigned long add = 0;
338 int dir;
339
340 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
341 if (ret)
342 return ret;
343 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
344 if (ret)
345 goto out;
346
347 /*
348 * Single TTM move. NOP.
349 */
350 if (old_iomap == NULL && new_iomap == NULL)
351 goto out2;
352
353 /*
354 * Don't move nonexistent data. Clear destination instead.
355 */
356 if (old_iomap == NULL &&
357 (ttm == NULL || (ttm->state == tt_unpopulated &&
358 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
359 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
360 goto out2;
361 }
362
363 /*
364 * TTM might be null for moves within the same region.
365 */
366 if (ttm && ttm->state == tt_unpopulated) {
367 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
368 if (ret)
369 goto out1;
370 }
371
372 add = 0;
373 dir = 1;
374
375 if ((old_mem->mem_type == new_mem->mem_type) &&
376 (new_mem->start < old_mem->start + old_mem->size)) {
377 dir = -1;
378 add = new_mem->num_pages - 1;
379 }
380
381 for (i = 0; i < new_mem->num_pages; ++i) {
382 page = i * dir + add;
383 if (old_iomap == NULL) {
384 pgprot_t prot = ttm_io_prot(old_mem->placement,
385 PAGE_KERNEL);
386 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
387 prot);
388 } else if (new_iomap == NULL) {
389 pgprot_t prot = ttm_io_prot(new_mem->placement,
390 PAGE_KERNEL);
391 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
392 prot);
393 } else
394 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
395 if (ret)
396 goto out1;
397 }
398 mb();
399out2:
400 old_copy = *old_mem;
401 *old_mem = *new_mem;
402 new_mem->mm_node = NULL;
403
404 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
405 ttm_tt_unbind(ttm);
406 ttm_tt_destroy(ttm);
407 bo->ttm = NULL;
408 }
409
410out1:
411 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
412out:
413 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
414
415 /*
416 * On error, keep the mm node!
417 */
418 if (!ret)
419 ttm_bo_mem_put(bo, &old_copy);
420 return ret;
421}
422EXPORT_SYMBOL(ttm_bo_move_memcpy);
423
424static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
425{
426 kfree(bo);
427}
428
429/**
430 * ttm_buffer_object_transfer
431 *
432 * @bo: A pointer to a struct ttm_buffer_object.
433 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
434 * holding the data of @bo with the old placement.
435 *
436 * This is a utility function that may be called after an accelerated move
437 * has been scheduled. A new buffer object is created as a placeholder for
438 * the old data while it's being copied. When that buffer object is idle,
439 * it can be destroyed, releasing the space of the old placement.
440 * Returns:
441 * !0: Failure.
442 */
443
444static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
445 struct ttm_buffer_object **new_obj)
446{
447 struct ttm_buffer_object *fbo;
448 int ret;
449
450 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
451 if (!fbo)
452 return -ENOMEM;
453
454 *fbo = *bo;
455
456 /**
457 * Fix up members that we shouldn't copy directly:
458 * TODO: Explicit member copy would probably be better here.
459 */
460
461 INIT_LIST_HEAD(&fbo->ddestroy);
462 INIT_LIST_HEAD(&fbo->lru);
463 INIT_LIST_HEAD(&fbo->swap);
464 INIT_LIST_HEAD(&fbo->io_reserve_lru);
465 drm_vma_node_reset(&fbo->vma_node);
466 atomic_set(&fbo->cpu_writers, 0);
467
468 kref_init(&fbo->list_kref);
469 kref_init(&fbo->kref);
470 fbo->destroy = &ttm_transfered_destroy;
471 fbo->acc_size = 0;
472 fbo->resv = &fbo->ttm_resv;
473 reservation_object_init(fbo->resv);
474 ret = ww_mutex_trylock(&fbo->resv->lock);
475 WARN_ON(!ret);
476
477 *new_obj = fbo;
478 return 0;
479}
480
481pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
482{
483 /* Cached mappings need no adjustment */
484 if (caching_flags & TTM_PL_FLAG_CACHED)
485 return tmp;
486
487#if defined(__i386__) || defined(__x86_64__)
488 if (caching_flags & TTM_PL_FLAG_WC)
489 tmp = pgprot_writecombine(tmp);
490 else if (boot_cpu_data.x86 > 3)
491 tmp = pgprot_noncached(tmp);
492#endif
493#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
494 defined(__powerpc__)
495 if (caching_flags & TTM_PL_FLAG_WC)
496 tmp = pgprot_writecombine(tmp);
497 else
498 tmp = pgprot_noncached(tmp);
499#endif
500#if defined(__sparc__) || defined(__mips__)
501 tmp = pgprot_noncached(tmp);
502#endif
503 return tmp;
504}
505EXPORT_SYMBOL(ttm_io_prot);
506
507static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
508 unsigned long offset,
509 unsigned long size,
510 struct ttm_bo_kmap_obj *map)
511{
512 struct ttm_mem_reg *mem = &bo->mem;
513
514 if (bo->mem.bus.addr) {
515 map->bo_kmap_type = ttm_bo_map_premapped;
516 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
517 } else {
518 map->bo_kmap_type = ttm_bo_map_iomap;
519 if (mem->placement & TTM_PL_FLAG_WC)
520 map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
521 size);
522 else
523 map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
524 size);
525 }
526 return (!map->virtual) ? -ENOMEM : 0;
527}
528
529static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
530 unsigned long start_page,
531 unsigned long num_pages,
532 struct ttm_bo_kmap_obj *map)
533{
534 struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
535 struct ttm_tt *ttm = bo->ttm;
536 int ret;
537
538 BUG_ON(!ttm);
539
540 if (ttm->state == tt_unpopulated) {
541 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
542 if (ret)
543 return ret;
544 }
545
546 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
547 /*
548 * We're mapping a single page, and the desired
549 * page protection is consistent with the bo.
550 */
551
552 map->bo_kmap_type = ttm_bo_map_kmap;
553 map->page = ttm->pages[start_page];
554 map->virtual = kmap(map->page);
555 } else {
556 /*
557 * We need to use vmap to get the desired page protection
558 * or to make the buffer object look contiguous.
559 */
560 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
561 map->bo_kmap_type = ttm_bo_map_vmap;
562 map->virtual = vmap(ttm->pages + start_page, num_pages,
563 0, prot);
564 }
565 return (!map->virtual) ? -ENOMEM : 0;
566}
567
568int ttm_bo_kmap(struct ttm_buffer_object *bo,
569 unsigned long start_page, unsigned long num_pages,
570 struct ttm_bo_kmap_obj *map)
571{
572 struct ttm_mem_type_manager *man =
573 &bo->bdev->man[bo->mem.mem_type];
574 unsigned long offset, size;
575 int ret;
576
577 BUG_ON(!list_empty(&bo->swap));
578 map->virtual = NULL;
579 map->bo = bo;
580 if (num_pages > bo->num_pages)
581 return -EINVAL;
582 if (start_page > bo->num_pages)
583 return -EINVAL;
584#if 0
585 if (num_pages > 1 && !capable(CAP_SYS_ADMIN))
586 return -EPERM;
587#endif
588 (void) ttm_mem_io_lock(man, false);
589 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
590 ttm_mem_io_unlock(man);
591 if (ret)
592 return ret;
593 if (!bo->mem.bus.is_iomem) {
594 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
595 } else {
596 offset = start_page << PAGE_SHIFT;
597 size = num_pages << PAGE_SHIFT;
598 return ttm_bo_ioremap(bo, offset, size, map);
599 }
600}
601EXPORT_SYMBOL(ttm_bo_kmap);
602
603void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
604{
605 struct ttm_buffer_object *bo = map->bo;
606 struct ttm_mem_type_manager *man =
607 &bo->bdev->man[bo->mem.mem_type];
608
609 if (!map->virtual)
610 return;
611 switch (map->bo_kmap_type) {
612 case ttm_bo_map_iomap:
613 iounmap(map->virtual);
614 break;
615 case ttm_bo_map_vmap:
616 vunmap(map->virtual);
617 break;
618 case ttm_bo_map_kmap:
619 kunmap(map->page);
620 break;
621 case ttm_bo_map_premapped:
622 break;
623 default:
624 BUG();
625 }
626 (void) ttm_mem_io_lock(man, false);
627 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
628 ttm_mem_io_unlock(man);
629 map->virtual = NULL;
630 map->page = NULL;
631}
632EXPORT_SYMBOL(ttm_bo_kunmap);
633
634int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
635 struct fence *fence,
636 bool evict,
637 bool no_wait_gpu,
638 struct ttm_mem_reg *new_mem)
639{
640 struct ttm_bo_device *bdev = bo->bdev;
641 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
642 struct ttm_mem_reg *old_mem = &bo->mem;
643 int ret;
644 struct ttm_buffer_object *ghost_obj;
645
646 reservation_object_add_excl_fence(bo->resv, fence);
647 if (evict) {
648 ret = ttm_bo_wait(bo, false, false, false);
649 if (ret)
650 return ret;
651
652 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
653 (bo->ttm != NULL)) {
654 ttm_tt_unbind(bo->ttm);
655 ttm_tt_destroy(bo->ttm);
656 bo->ttm = NULL;
657 }
658 ttm_bo_free_old_node(bo);
659 } else {
660 /**
661 * This should help pipeline ordinary buffer moves.
662 *
663 * Hang old buffer memory on a new buffer object,
664 * and leave it to be released when the GPU
665 * operation has completed.
666 */
667
668 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
669
670 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
671 if (ret)
672 return ret;
673
674 reservation_object_add_excl_fence(ghost_obj->resv, fence);
675
676 /**
677 * If we're not moving to fixed memory, the TTM object
678 * needs to stay alive. Otherwhise hang it on the ghost
679 * bo to be unbound and destroyed.
680 */
681
682 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
683 ghost_obj->ttm = NULL;
684 else
685 bo->ttm = NULL;
686
687 ttm_bo_unreserve(ghost_obj);
688 ttm_bo_unref(&ghost_obj);
689 }
690
691 *old_mem = *new_mem;
692 new_mem->mm_node = NULL;
693
694 return 0;
695}
696EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
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->use_io_reserve_lru))
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}
105
106void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
107{
108 if (likely(!man->use_io_reserve_lru))
109 return;
110
111 mutex_unlock(&man->io_reserve_mutex);
112}
113
114static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
115{
116 struct ttm_buffer_object *bo;
117
118 bo = list_first_entry_or_null(&man->io_reserve_lru,
119 struct ttm_buffer_object,
120 io_reserve_lru);
121 if (!bo)
122 return -ENOSPC;
123
124 list_del_init(&bo->io_reserve_lru);
125 ttm_bo_unmap_virtual_locked(bo);
126 return 0;
127}
128
129int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
130 struct ttm_mem_reg *mem)
131{
132 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
133 int ret;
134
135 if (mem->bus.io_reserved_count++)
136 return 0;
137
138 if (!bdev->driver->io_mem_reserve)
139 return 0;
140
141retry:
142 ret = bdev->driver->io_mem_reserve(bdev, mem);
143 if (ret == -ENOSPC) {
144 ret = ttm_mem_io_evict(man);
145 if (ret == 0)
146 goto retry;
147 }
148 return ret;
149}
150
151void ttm_mem_io_free(struct ttm_bo_device *bdev,
152 struct ttm_mem_reg *mem)
153{
154 if (--mem->bus.io_reserved_count)
155 return;
156
157 if (!bdev->driver->io_mem_free)
158 return;
159
160 bdev->driver->io_mem_free(bdev, mem);
161}
162
163int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
164{
165 struct ttm_mem_type_manager *man = &bo->bdev->man[bo->mem.mem_type];
166 struct ttm_mem_reg *mem = &bo->mem;
167 int ret;
168
169 if (mem->bus.io_reserved_vm)
170 return 0;
171
172 ret = ttm_mem_io_reserve(bo->bdev, mem);
173 if (unlikely(ret != 0))
174 return ret;
175 mem->bus.io_reserved_vm = true;
176 if (man->use_io_reserve_lru)
177 list_add_tail(&bo->io_reserve_lru,
178 &man->io_reserve_lru);
179 return 0;
180}
181
182void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
183{
184 struct ttm_mem_reg *mem = &bo->mem;
185
186 if (!mem->bus.io_reserved_vm)
187 return;
188
189 mem->bus.io_reserved_vm = false;
190 list_del_init(&bo->io_reserve_lru);
191 ttm_mem_io_free(bo->bdev, mem);
192}
193
194static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev,
195 struct ttm_mem_reg *mem,
196 void **virtual)
197{
198 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
199 int ret;
200 void *addr;
201
202 *virtual = NULL;
203 (void) ttm_mem_io_lock(man, false);
204 ret = ttm_mem_io_reserve(bdev, mem);
205 ttm_mem_io_unlock(man);
206 if (ret || !mem->bus.is_iomem)
207 return ret;
208
209 if (mem->bus.addr) {
210 addr = mem->bus.addr;
211 } else {
212 if (mem->placement & TTM_PL_FLAG_WC)
213 addr = ioremap_wc(mem->bus.base + mem->bus.offset,
214 mem->bus.size);
215 else
216 addr = ioremap(mem->bus.base + mem->bus.offset,
217 mem->bus.size);
218 if (!addr) {
219 (void) ttm_mem_io_lock(man, false);
220 ttm_mem_io_free(bdev, mem);
221 ttm_mem_io_unlock(man);
222 return -ENOMEM;
223 }
224 }
225 *virtual = addr;
226 return 0;
227}
228
229static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev,
230 struct ttm_mem_reg *mem,
231 void *virtual)
232{
233 struct ttm_mem_type_manager *man;
234
235 man = &bdev->man[mem->mem_type];
236
237 if (virtual && mem->bus.addr == NULL)
238 iounmap(virtual);
239 (void) ttm_mem_io_lock(man, false);
240 ttm_mem_io_free(bdev, mem);
241 ttm_mem_io_unlock(man);
242}
243
244static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
245{
246 uint32_t *dstP =
247 (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
248 uint32_t *srcP =
249 (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
250
251 int i;
252 for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
253 iowrite32(ioread32(srcP++), dstP++);
254 return 0;
255}
256
257static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
258 unsigned long page,
259 pgprot_t prot)
260{
261 struct page *d = ttm->pages[page];
262 void *dst;
263
264 if (!d)
265 return -ENOMEM;
266
267 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
268 dst = kmap_atomic_prot(d, prot);
269 if (!dst)
270 return -ENOMEM;
271
272 memcpy_fromio(dst, src, PAGE_SIZE);
273
274 kunmap_atomic(dst);
275
276 return 0;
277}
278
279static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
280 unsigned long page,
281 pgprot_t prot)
282{
283 struct page *s = ttm->pages[page];
284 void *src;
285
286 if (!s)
287 return -ENOMEM;
288
289 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
290 src = kmap_atomic_prot(s, prot);
291 if (!src)
292 return -ENOMEM;
293
294 memcpy_toio(dst, src, PAGE_SIZE);
295
296 kunmap_atomic(src);
297
298 return 0;
299}
300
301int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
302 struct ttm_operation_ctx *ctx,
303 struct ttm_mem_reg *new_mem)
304{
305 struct ttm_bo_device *bdev = bo->bdev;
306 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
307 struct ttm_tt *ttm = bo->ttm;
308 struct ttm_mem_reg *old_mem = &bo->mem;
309 struct ttm_mem_reg old_copy = *old_mem;
310 void *old_iomap;
311 void *new_iomap;
312 int ret;
313 unsigned long i;
314 unsigned long page;
315 unsigned long add = 0;
316 int dir;
317
318 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
319 if (ret)
320 return ret;
321
322 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
323 if (ret)
324 return ret;
325 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
326 if (ret)
327 goto out;
328
329 /*
330 * Single TTM move. NOP.
331 */
332 if (old_iomap == NULL && new_iomap == NULL)
333 goto out2;
334
335 /*
336 * Don't move nonexistent data. Clear destination instead.
337 */
338 if (old_iomap == NULL &&
339 (ttm == NULL || (ttm->state == tt_unpopulated &&
340 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
341 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
342 goto out2;
343 }
344
345 /*
346 * TTM might be null for moves within the same region.
347 */
348 if (ttm) {
349 ret = ttm_tt_populate(ttm, ctx);
350 if (ret)
351 goto out1;
352 }
353
354 add = 0;
355 dir = 1;
356
357 if ((old_mem->mem_type == new_mem->mem_type) &&
358 (new_mem->start < old_mem->start + old_mem->size)) {
359 dir = -1;
360 add = new_mem->num_pages - 1;
361 }
362
363 for (i = 0; i < new_mem->num_pages; ++i) {
364 page = i * dir + add;
365 if (old_iomap == NULL) {
366 pgprot_t prot = ttm_io_prot(old_mem->placement,
367 PAGE_KERNEL);
368 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
369 prot);
370 } else if (new_iomap == NULL) {
371 pgprot_t prot = ttm_io_prot(new_mem->placement,
372 PAGE_KERNEL);
373 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
374 prot);
375 } else {
376 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
377 }
378 if (ret)
379 goto out1;
380 }
381 mb();
382out2:
383 old_copy = *old_mem;
384 *old_mem = *new_mem;
385 new_mem->mm_node = NULL;
386
387 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
388 ttm_tt_destroy(ttm);
389 bo->ttm = NULL;
390 }
391
392out1:
393 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
394out:
395 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
396
397 /*
398 * On error, keep the mm node!
399 */
400 if (!ret)
401 ttm_bo_mem_put(bo, &old_copy);
402 return ret;
403}
404EXPORT_SYMBOL(ttm_bo_move_memcpy);
405
406static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
407{
408 struct ttm_transfer_obj *fbo;
409
410 fbo = container_of(bo, struct ttm_transfer_obj, base);
411 ttm_bo_put(fbo->bo);
412 kfree(fbo);
413}
414
415/**
416 * ttm_buffer_object_transfer
417 *
418 * @bo: A pointer to a struct ttm_buffer_object.
419 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
420 * holding the data of @bo with the old placement.
421 *
422 * This is a utility function that may be called after an accelerated move
423 * has been scheduled. A new buffer object is created as a placeholder for
424 * the old data while it's being copied. When that buffer object is idle,
425 * it can be destroyed, releasing the space of the old placement.
426 * Returns:
427 * !0: Failure.
428 */
429
430static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
431 struct ttm_buffer_object **new_obj)
432{
433 struct ttm_transfer_obj *fbo;
434 int ret;
435
436 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
437 if (!fbo)
438 return -ENOMEM;
439
440 fbo->base = *bo;
441 fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
442
443 ttm_bo_get(bo);
444 fbo->bo = bo;
445
446 /**
447 * Fix up members that we shouldn't copy directly:
448 * TODO: Explicit member copy would probably be better here.
449 */
450
451 atomic_inc(&ttm_bo_glob.bo_count);
452 INIT_LIST_HEAD(&fbo->base.ddestroy);
453 INIT_LIST_HEAD(&fbo->base.lru);
454 INIT_LIST_HEAD(&fbo->base.swap);
455 INIT_LIST_HEAD(&fbo->base.io_reserve_lru);
456 fbo->base.moving = NULL;
457 drm_vma_node_reset(&fbo->base.base.vma_node);
458
459 kref_init(&fbo->base.kref);
460 fbo->base.destroy = &ttm_transfered_destroy;
461 fbo->base.acc_size = 0;
462 if (bo->type != ttm_bo_type_sg)
463 fbo->base.base.resv = &fbo->base.base._resv;
464
465 dma_resv_init(&fbo->base.base._resv);
466 fbo->base.base.dev = NULL;
467 ret = dma_resv_trylock(&fbo->base.base._resv);
468 WARN_ON(!ret);
469
470 *new_obj = &fbo->base;
471 return 0;
472}
473
474pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
475{
476 /* Cached mappings need no adjustment */
477 if (caching_flags & TTM_PL_FLAG_CACHED)
478 return tmp;
479
480#if defined(__i386__) || defined(__x86_64__)
481 if (caching_flags & TTM_PL_FLAG_WC)
482 tmp = pgprot_writecombine(tmp);
483 else if (boot_cpu_data.x86 > 3)
484 tmp = pgprot_noncached(tmp);
485#endif
486#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
487 defined(__powerpc__) || defined(__mips__)
488 if (caching_flags & TTM_PL_FLAG_WC)
489 tmp = pgprot_writecombine(tmp);
490 else
491 tmp = pgprot_noncached(tmp);
492#endif
493#if defined(__sparc__)
494 tmp = pgprot_noncached(tmp);
495#endif
496 return tmp;
497}
498EXPORT_SYMBOL(ttm_io_prot);
499
500static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
501 unsigned long offset,
502 unsigned long size,
503 struct ttm_bo_kmap_obj *map)
504{
505 struct ttm_mem_reg *mem = &bo->mem;
506
507 if (bo->mem.bus.addr) {
508 map->bo_kmap_type = ttm_bo_map_premapped;
509 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
510 } else {
511 map->bo_kmap_type = ttm_bo_map_iomap;
512 if (mem->placement & TTM_PL_FLAG_WC)
513 map->virtual = ioremap_wc(bo->mem.bus.base +
514 bo->mem.bus.offset + offset,
515 size);
516 else
517 map->virtual = ioremap(bo->mem.bus.base +
518 bo->mem.bus.offset + offset,
519 size);
520 }
521 return (!map->virtual) ? -ENOMEM : 0;
522}
523
524static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
525 unsigned long start_page,
526 unsigned long num_pages,
527 struct ttm_bo_kmap_obj *map)
528{
529 struct ttm_mem_reg *mem = &bo->mem;
530 struct ttm_operation_ctx ctx = {
531 .interruptible = false,
532 .no_wait_gpu = false
533 };
534 struct ttm_tt *ttm = bo->ttm;
535 pgprot_t prot;
536 int ret;
537
538 BUG_ON(!ttm);
539
540 ret = ttm_tt_populate(ttm, &ctx);
541 if (ret)
542 return ret;
543
544 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
545 /*
546 * We're mapping a single page, and the desired
547 * page protection is consistent with the bo.
548 */
549
550 map->bo_kmap_type = ttm_bo_map_kmap;
551 map->page = ttm->pages[start_page];
552 map->virtual = kmap(map->page);
553 } else {
554 /*
555 * We need to use vmap to get the desired page protection
556 * or to make the buffer object look contiguous.
557 */
558 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
559 map->bo_kmap_type = ttm_bo_map_vmap;
560 map->virtual = vmap(ttm->pages + start_page, num_pages,
561 0, prot);
562 }
563 return (!map->virtual) ? -ENOMEM : 0;
564}
565
566int ttm_bo_kmap(struct ttm_buffer_object *bo,
567 unsigned long start_page, unsigned long num_pages,
568 struct ttm_bo_kmap_obj *map)
569{
570 struct ttm_mem_type_manager *man =
571 &bo->bdev->man[bo->mem.mem_type];
572 unsigned long offset, size;
573 int ret;
574
575 map->virtual = NULL;
576 map->bo = bo;
577 if (num_pages > bo->num_pages)
578 return -EINVAL;
579 if (start_page > bo->num_pages)
580 return -EINVAL;
581
582 (void) ttm_mem_io_lock(man, false);
583 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
584 ttm_mem_io_unlock(man);
585 if (ret)
586 return ret;
587 if (!bo->mem.bus.is_iomem) {
588 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
589 } else {
590 offset = start_page << PAGE_SHIFT;
591 size = num_pages << PAGE_SHIFT;
592 return ttm_bo_ioremap(bo, offset, size, map);
593 }
594}
595EXPORT_SYMBOL(ttm_bo_kmap);
596
597void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
598{
599 struct ttm_buffer_object *bo = map->bo;
600 struct ttm_mem_type_manager *man =
601 &bo->bdev->man[bo->mem.mem_type];
602
603 if (!map->virtual)
604 return;
605 switch (map->bo_kmap_type) {
606 case ttm_bo_map_iomap:
607 iounmap(map->virtual);
608 break;
609 case ttm_bo_map_vmap:
610 vunmap(map->virtual);
611 break;
612 case ttm_bo_map_kmap:
613 kunmap(map->page);
614 break;
615 case ttm_bo_map_premapped:
616 break;
617 default:
618 BUG();
619 }
620 (void) ttm_mem_io_lock(man, false);
621 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
622 ttm_mem_io_unlock(man);
623 map->virtual = NULL;
624 map->page = NULL;
625}
626EXPORT_SYMBOL(ttm_bo_kunmap);
627
628int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
629 struct dma_fence *fence,
630 bool evict,
631 struct ttm_mem_reg *new_mem)
632{
633 struct ttm_bo_device *bdev = bo->bdev;
634 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
635 struct ttm_mem_reg *old_mem = &bo->mem;
636 int ret;
637 struct ttm_buffer_object *ghost_obj;
638
639 dma_resv_add_excl_fence(bo->base.resv, fence);
640 if (evict) {
641 ret = ttm_bo_wait(bo, false, false);
642 if (ret)
643 return ret;
644
645 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
646 ttm_tt_destroy(bo->ttm);
647 bo->ttm = NULL;
648 }
649 ttm_bo_free_old_node(bo);
650 } else {
651 /**
652 * This should help pipeline ordinary buffer moves.
653 *
654 * Hang old buffer memory on a new buffer object,
655 * and leave it to be released when the GPU
656 * operation has completed.
657 */
658
659 dma_fence_put(bo->moving);
660 bo->moving = dma_fence_get(fence);
661
662 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
663 if (ret)
664 return ret;
665
666 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
667
668 /**
669 * If we're not moving to fixed memory, the TTM object
670 * needs to stay alive. Otherwhise hang it on the ghost
671 * bo to be unbound and destroyed.
672 */
673
674 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
675 ghost_obj->ttm = NULL;
676 else
677 bo->ttm = NULL;
678
679 dma_resv_unlock(&ghost_obj->base._resv);
680 ttm_bo_put(ghost_obj);
681 }
682
683 *old_mem = *new_mem;
684 new_mem->mm_node = NULL;
685
686 return 0;
687}
688EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
689
690int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
691 struct dma_fence *fence, bool evict,
692 struct ttm_mem_reg *new_mem)
693{
694 struct ttm_bo_device *bdev = bo->bdev;
695 struct ttm_mem_reg *old_mem = &bo->mem;
696
697 struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
698 struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
699
700 int ret;
701
702 dma_resv_add_excl_fence(bo->base.resv, fence);
703
704 if (!evict) {
705 struct ttm_buffer_object *ghost_obj;
706
707 /**
708 * This should help pipeline ordinary buffer moves.
709 *
710 * Hang old buffer memory on a new buffer object,
711 * and leave it to be released when the GPU
712 * operation has completed.
713 */
714
715 dma_fence_put(bo->moving);
716 bo->moving = dma_fence_get(fence);
717
718 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
719 if (ret)
720 return ret;
721
722 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
723
724 /**
725 * If we're not moving to fixed memory, the TTM object
726 * needs to stay alive. Otherwhise hang it on the ghost
727 * bo to be unbound and destroyed.
728 */
729
730 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
731 ghost_obj->ttm = NULL;
732 else
733 bo->ttm = NULL;
734
735 dma_resv_unlock(&ghost_obj->base._resv);
736 ttm_bo_put(ghost_obj);
737
738 } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
739
740 /**
741 * BO doesn't have a TTM we need to bind/unbind. Just remember
742 * this eviction and free up the allocation
743 */
744
745 spin_lock(&from->move_lock);
746 if (!from->move || dma_fence_is_later(fence, from->move)) {
747 dma_fence_put(from->move);
748 from->move = dma_fence_get(fence);
749 }
750 spin_unlock(&from->move_lock);
751
752 ttm_bo_free_old_node(bo);
753
754 dma_fence_put(bo->moving);
755 bo->moving = dma_fence_get(fence);
756
757 } else {
758 /**
759 * Last resort, wait for the move to be completed.
760 *
761 * Should never happen in pratice.
762 */
763
764 ret = ttm_bo_wait(bo, false, false);
765 if (ret)
766 return ret;
767
768 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
769 ttm_tt_destroy(bo->ttm);
770 bo->ttm = NULL;
771 }
772 ttm_bo_free_old_node(bo);
773 }
774
775 *old_mem = *new_mem;
776 new_mem->mm_node = NULL;
777
778 return 0;
779}
780EXPORT_SYMBOL(ttm_bo_pipeline_move);
781
782int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
783{
784 struct ttm_buffer_object *ghost;
785 int ret;
786
787 ret = ttm_buffer_object_transfer(bo, &ghost);
788 if (ret)
789 return ret;
790
791 ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
792 /* Last resort, wait for the BO to be idle when we are OOM */
793 if (ret)
794 ttm_bo_wait(bo, false, false);
795
796 memset(&bo->mem, 0, sizeof(bo->mem));
797 bo->mem.mem_type = TTM_PL_SYSTEM;
798 bo->ttm = NULL;
799
800 dma_resv_unlock(&ghost->base._resv);
801 ttm_bo_put(ghost);
802
803 return 0;
804}