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