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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 bool interruptible, bool no_wait_gpu,
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, interruptible, 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);
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
258static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
259 unsigned long page,
260 pgprot_t prot)
261{
262 struct page *d = ttm->pages[page];
263 void *dst;
264
265 if (!d)
266 return -ENOMEM;
267
268 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
269
270#ifdef CONFIG_X86
271 dst = kmap_atomic_prot(d, prot);
272#else
273 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
274 dst = vmap(&d, 1, 0, prot);
275 else
276 dst = kmap(d);
277#endif
278 if (!dst)
279 return -ENOMEM;
280
281 memcpy_fromio(dst, src, PAGE_SIZE);
282
283#ifdef CONFIG_X86
284 kunmap_atomic(dst);
285#else
286 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
287 vunmap(dst);
288 else
289 kunmap(d);
290#endif
291
292 return 0;
293}
294
295static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
296 unsigned long page,
297 pgprot_t prot)
298{
299 struct page *s = ttm->pages[page];
300 void *src;
301
302 if (!s)
303 return -ENOMEM;
304
305 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
306#ifdef CONFIG_X86
307 src = kmap_atomic_prot(s, prot);
308#else
309 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
310 src = vmap(&s, 1, 0, prot);
311 else
312 src = kmap(s);
313#endif
314 if (!src)
315 return -ENOMEM;
316
317 memcpy_toio(dst, src, PAGE_SIZE);
318
319#ifdef CONFIG_X86
320 kunmap_atomic(src);
321#else
322 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
323 vunmap(src);
324 else
325 kunmap(s);
326#endif
327
328 return 0;
329}
330
331int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
332 bool interruptible, bool no_wait_gpu,
333 struct ttm_mem_reg *new_mem)
334{
335 struct ttm_bo_device *bdev = bo->bdev;
336 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
337 struct ttm_tt *ttm = bo->ttm;
338 struct ttm_mem_reg *old_mem = &bo->mem;
339 struct ttm_mem_reg old_copy = *old_mem;
340 void *old_iomap;
341 void *new_iomap;
342 int ret;
343 unsigned long i;
344 unsigned long page;
345 unsigned long add = 0;
346 int dir;
347
348 ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
349 if (ret)
350 return ret;
351
352 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
353 if (ret)
354 return ret;
355 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
356 if (ret)
357 goto out;
358
359 /*
360 * Single TTM move. NOP.
361 */
362 if (old_iomap == NULL && new_iomap == NULL)
363 goto out2;
364
365 /*
366 * Don't move nonexistent data. Clear destination instead.
367 */
368 if (old_iomap == NULL &&
369 (ttm == NULL || (ttm->state == tt_unpopulated &&
370 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
371 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
372 goto out2;
373 }
374
375 /*
376 * TTM might be null for moves within the same region.
377 */
378 if (ttm && ttm->state == tt_unpopulated) {
379 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
380 if (ret)
381 goto out1;
382 }
383
384 add = 0;
385 dir = 1;
386
387 if ((old_mem->mem_type == new_mem->mem_type) &&
388 (new_mem->start < old_mem->start + old_mem->size)) {
389 dir = -1;
390 add = new_mem->num_pages - 1;
391 }
392
393 for (i = 0; i < new_mem->num_pages; ++i) {
394 page = i * dir + add;
395 if (old_iomap == NULL) {
396 pgprot_t prot = ttm_io_prot(old_mem->placement,
397 PAGE_KERNEL);
398 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
399 prot);
400 } else if (new_iomap == NULL) {
401 pgprot_t prot = ttm_io_prot(new_mem->placement,
402 PAGE_KERNEL);
403 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
404 prot);
405 } else
406 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
407 if (ret)
408 goto out1;
409 }
410 mb();
411out2:
412 old_copy = *old_mem;
413 *old_mem = *new_mem;
414 new_mem->mm_node = NULL;
415
416 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
417 ttm_tt_destroy(ttm);
418 bo->ttm = NULL;
419 }
420
421out1:
422 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
423out:
424 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
425
426 /*
427 * On error, keep the mm node!
428 */
429 if (!ret)
430 ttm_bo_mem_put(bo, &old_copy);
431 return ret;
432}
433EXPORT_SYMBOL(ttm_bo_move_memcpy);
434
435static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
436{
437 kfree(bo);
438}
439
440/**
441 * ttm_buffer_object_transfer
442 *
443 * @bo: A pointer to a struct ttm_buffer_object.
444 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
445 * holding the data of @bo with the old placement.
446 *
447 * This is a utility function that may be called after an accelerated move
448 * has been scheduled. A new buffer object is created as a placeholder for
449 * the old data while it's being copied. When that buffer object is idle,
450 * it can be destroyed, releasing the space of the old placement.
451 * Returns:
452 * !0: Failure.
453 */
454
455static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
456 struct ttm_buffer_object **new_obj)
457{
458 struct ttm_buffer_object *fbo;
459 int ret;
460
461 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
462 if (!fbo)
463 return -ENOMEM;
464
465 *fbo = *bo;
466
467 /**
468 * Fix up members that we shouldn't copy directly:
469 * TODO: Explicit member copy would probably be better here.
470 */
471
472 INIT_LIST_HEAD(&fbo->ddestroy);
473 INIT_LIST_HEAD(&fbo->lru);
474 INIT_LIST_HEAD(&fbo->swap);
475 INIT_LIST_HEAD(&fbo->io_reserve_lru);
476 fbo->moving = NULL;
477 drm_vma_node_reset(&fbo->vma_node);
478 atomic_set(&fbo->cpu_writers, 0);
479
480 kref_init(&fbo->list_kref);
481 kref_init(&fbo->kref);
482 fbo->destroy = &ttm_transfered_destroy;
483 fbo->acc_size = 0;
484 fbo->resv = &fbo->ttm_resv;
485 reservation_object_init(fbo->resv);
486 ret = ww_mutex_trylock(&fbo->resv->lock);
487 WARN_ON(!ret);
488
489 *new_obj = fbo;
490 return 0;
491}
492
493pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
494{
495 /* Cached mappings need no adjustment */
496 if (caching_flags & TTM_PL_FLAG_CACHED)
497 return tmp;
498
499#if defined(__i386__) || defined(__x86_64__)
500 if (caching_flags & TTM_PL_FLAG_WC)
501 tmp = pgprot_writecombine(tmp);
502 else if (boot_cpu_data.x86 > 3)
503 tmp = pgprot_noncached(tmp);
504#endif
505#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
506 defined(__powerpc__)
507 if (caching_flags & TTM_PL_FLAG_WC)
508 tmp = pgprot_writecombine(tmp);
509 else
510 tmp = pgprot_noncached(tmp);
511#endif
512#if defined(__sparc__) || defined(__mips__)
513 tmp = pgprot_noncached(tmp);
514#endif
515 return tmp;
516}
517EXPORT_SYMBOL(ttm_io_prot);
518
519static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
520 unsigned long offset,
521 unsigned long size,
522 struct ttm_bo_kmap_obj *map)
523{
524 struct ttm_mem_reg *mem = &bo->mem;
525
526 if (bo->mem.bus.addr) {
527 map->bo_kmap_type = ttm_bo_map_premapped;
528 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
529 } else {
530 map->bo_kmap_type = ttm_bo_map_iomap;
531 if (mem->placement & TTM_PL_FLAG_WC)
532 map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
533 size);
534 else
535 map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
536 size);
537 }
538 return (!map->virtual) ? -ENOMEM : 0;
539}
540
541static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
542 unsigned long start_page,
543 unsigned long num_pages,
544 struct ttm_bo_kmap_obj *map)
545{
546 struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
547 struct ttm_tt *ttm = bo->ttm;
548 int ret;
549
550 BUG_ON(!ttm);
551
552 if (ttm->state == tt_unpopulated) {
553 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
554 if (ret)
555 return ret;
556 }
557
558 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
559 /*
560 * We're mapping a single page, and the desired
561 * page protection is consistent with the bo.
562 */
563
564 map->bo_kmap_type = ttm_bo_map_kmap;
565 map->page = ttm->pages[start_page];
566 map->virtual = kmap(map->page);
567 } else {
568 /*
569 * We need to use vmap to get the desired page protection
570 * or to make the buffer object look contiguous.
571 */
572 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
573 map->bo_kmap_type = ttm_bo_map_vmap;
574 map->virtual = vmap(ttm->pages + start_page, num_pages,
575 0, prot);
576 }
577 return (!map->virtual) ? -ENOMEM : 0;
578}
579
580int ttm_bo_kmap(struct ttm_buffer_object *bo,
581 unsigned long start_page, unsigned long num_pages,
582 struct ttm_bo_kmap_obj *map)
583{
584 struct ttm_mem_type_manager *man =
585 &bo->bdev->man[bo->mem.mem_type];
586 unsigned long offset, size;
587 int ret;
588
589 BUG_ON(!list_empty(&bo->swap));
590 map->virtual = NULL;
591 map->bo = bo;
592 if (num_pages > bo->num_pages)
593 return -EINVAL;
594 if (start_page > bo->num_pages)
595 return -EINVAL;
596#if 0
597 if (num_pages > 1 && !capable(CAP_SYS_ADMIN))
598 return -EPERM;
599#endif
600 (void) ttm_mem_io_lock(man, false);
601 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
602 ttm_mem_io_unlock(man);
603 if (ret)
604 return ret;
605 if (!bo->mem.bus.is_iomem) {
606 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
607 } else {
608 offset = start_page << PAGE_SHIFT;
609 size = num_pages << PAGE_SHIFT;
610 return ttm_bo_ioremap(bo, offset, size, map);
611 }
612}
613EXPORT_SYMBOL(ttm_bo_kmap);
614
615void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
616{
617 struct ttm_buffer_object *bo = map->bo;
618 struct ttm_mem_type_manager *man =
619 &bo->bdev->man[bo->mem.mem_type];
620
621 if (!map->virtual)
622 return;
623 switch (map->bo_kmap_type) {
624 case ttm_bo_map_iomap:
625 iounmap(map->virtual);
626 break;
627 case ttm_bo_map_vmap:
628 vunmap(map->virtual);
629 break;
630 case ttm_bo_map_kmap:
631 kunmap(map->page);
632 break;
633 case ttm_bo_map_premapped:
634 break;
635 default:
636 BUG();
637 }
638 (void) ttm_mem_io_lock(man, false);
639 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
640 ttm_mem_io_unlock(man);
641 map->virtual = NULL;
642 map->page = NULL;
643}
644EXPORT_SYMBOL(ttm_bo_kunmap);
645
646int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
647 struct dma_fence *fence,
648 bool evict,
649 struct ttm_mem_reg *new_mem)
650{
651 struct ttm_bo_device *bdev = bo->bdev;
652 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
653 struct ttm_mem_reg *old_mem = &bo->mem;
654 int ret;
655 struct ttm_buffer_object *ghost_obj;
656
657 reservation_object_add_excl_fence(bo->resv, fence);
658 if (evict) {
659 ret = ttm_bo_wait(bo, false, false);
660 if (ret)
661 return ret;
662
663 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
664 ttm_tt_destroy(bo->ttm);
665 bo->ttm = NULL;
666 }
667 ttm_bo_free_old_node(bo);
668 } else {
669 /**
670 * This should help pipeline ordinary buffer moves.
671 *
672 * Hang old buffer memory on a new buffer object,
673 * and leave it to be released when the GPU
674 * operation has completed.
675 */
676
677 dma_fence_put(bo->moving);
678 bo->moving = dma_fence_get(fence);
679
680 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
681 if (ret)
682 return ret;
683
684 reservation_object_add_excl_fence(ghost_obj->resv, fence);
685
686 /**
687 * If we're not moving to fixed memory, the TTM object
688 * needs to stay alive. Otherwhise hang it on the ghost
689 * bo to be unbound and destroyed.
690 */
691
692 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
693 ghost_obj->ttm = NULL;
694 else
695 bo->ttm = NULL;
696
697 ttm_bo_unreserve(ghost_obj);
698 ttm_bo_unref(&ghost_obj);
699 }
700
701 *old_mem = *new_mem;
702 new_mem->mm_node = NULL;
703
704 return 0;
705}
706EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
707
708int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
709 struct dma_fence *fence, bool evict,
710 struct ttm_mem_reg *new_mem)
711{
712 struct ttm_bo_device *bdev = bo->bdev;
713 struct ttm_mem_reg *old_mem = &bo->mem;
714
715 struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
716 struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
717
718 int ret;
719
720 reservation_object_add_excl_fence(bo->resv, fence);
721
722 if (!evict) {
723 struct ttm_buffer_object *ghost_obj;
724
725 /**
726 * This should help pipeline ordinary buffer moves.
727 *
728 * Hang old buffer memory on a new buffer object,
729 * and leave it to be released when the GPU
730 * operation has completed.
731 */
732
733 dma_fence_put(bo->moving);
734 bo->moving = dma_fence_get(fence);
735
736 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
737 if (ret)
738 return ret;
739
740 reservation_object_add_excl_fence(ghost_obj->resv, fence);
741
742 /**
743 * If we're not moving to fixed memory, the TTM object
744 * needs to stay alive. Otherwhise hang it on the ghost
745 * bo to be unbound and destroyed.
746 */
747
748 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
749 ghost_obj->ttm = NULL;
750 else
751 bo->ttm = NULL;
752
753 ttm_bo_unreserve(ghost_obj);
754 ttm_bo_unref(&ghost_obj);
755
756 } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
757
758 /**
759 * BO doesn't have a TTM we need to bind/unbind. Just remember
760 * this eviction and free up the allocation
761 */
762
763 spin_lock(&from->move_lock);
764 if (!from->move || dma_fence_is_later(fence, from->move)) {
765 dma_fence_put(from->move);
766 from->move = dma_fence_get(fence);
767 }
768 spin_unlock(&from->move_lock);
769
770 ttm_bo_free_old_node(bo);
771
772 dma_fence_put(bo->moving);
773 bo->moving = dma_fence_get(fence);
774
775 } else {
776 /**
777 * Last resort, wait for the move to be completed.
778 *
779 * Should never happen in pratice.
780 */
781
782 ret = ttm_bo_wait(bo, false, false);
783 if (ret)
784 return ret;
785
786 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
787 ttm_tt_destroy(bo->ttm);
788 bo->ttm = NULL;
789 }
790 ttm_bo_free_old_node(bo);
791 }
792
793 *old_mem = *new_mem;
794 new_mem->mm_node = NULL;
795
796 return 0;
797}
798EXPORT_SYMBOL(ttm_bo_pipeline_move);