ttm: don't destroy old mm_node on memcpy failure
[~shefty/rdma-dev.git] / drivers / gpu / drm / ttm / ttm_bo_util.c
1 /**************************************************************************
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3  * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
4  * All Rights Reserved.
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16  * of the Software.
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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 <linux/io.h>
34 #include <linux/highmem.h>
35 #include <linux/wait.h>
36 #include <linux/slab.h>
37 #include <linux/vmalloc.h>
38 #include <linux/module.h>
39
40 void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
41 {
42         ttm_bo_mem_put(bo, &bo->mem);
43 }
44
45 int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
46                     bool evict,
47                     bool no_wait_gpu, struct ttm_mem_reg *new_mem)
48 {
49         struct ttm_tt *ttm = bo->ttm;
50         struct ttm_mem_reg *old_mem = &bo->mem;
51         int ret;
52
53         if (old_mem->mem_type != TTM_PL_SYSTEM) {
54                 ttm_tt_unbind(ttm);
55                 ttm_bo_free_old_node(bo);
56                 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
57                                 TTM_PL_MASK_MEM);
58                 old_mem->mem_type = TTM_PL_SYSTEM;
59         }
60
61         ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
62         if (unlikely(ret != 0))
63                 return ret;
64
65         if (new_mem->mem_type != TTM_PL_SYSTEM) {
66                 ret = ttm_tt_bind(ttm, new_mem);
67                 if (unlikely(ret != 0))
68                         return ret;
69         }
70
71         *old_mem = *new_mem;
72         new_mem->mm_node = NULL;
73
74         return 0;
75 }
76 EXPORT_SYMBOL(ttm_bo_move_ttm);
77
78 int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
79 {
80         if (likely(man->io_reserve_fastpath))
81                 return 0;
82
83         if (interruptible)
84                 return mutex_lock_interruptible(&man->io_reserve_mutex);
85
86         mutex_lock(&man->io_reserve_mutex);
87         return 0;
88 }
89
90 void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
91 {
92         if (likely(man->io_reserve_fastpath))
93                 return;
94
95         mutex_unlock(&man->io_reserve_mutex);
96 }
97
98 static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
99 {
100         struct ttm_buffer_object *bo;
101
102         if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
103                 return -EAGAIN;
104
105         bo = list_first_entry(&man->io_reserve_lru,
106                               struct ttm_buffer_object,
107                               io_reserve_lru);
108         list_del_init(&bo->io_reserve_lru);
109         ttm_bo_unmap_virtual_locked(bo);
110
111         return 0;
112 }
113
114 static int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
115                               struct ttm_mem_reg *mem)
116 {
117         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
118         int ret = 0;
119
120         if (!bdev->driver->io_mem_reserve)
121                 return 0;
122         if (likely(man->io_reserve_fastpath))
123                 return bdev->driver->io_mem_reserve(bdev, mem);
124
125         if (bdev->driver->io_mem_reserve &&
126             mem->bus.io_reserved_count++ == 0) {
127 retry:
128                 ret = bdev->driver->io_mem_reserve(bdev, mem);
129                 if (ret == -EAGAIN) {
130                         ret = ttm_mem_io_evict(man);
131                         if (ret == 0)
132                                 goto retry;
133                 }
134         }
135         return ret;
136 }
137
138 static void ttm_mem_io_free(struct ttm_bo_device *bdev,
139                             struct ttm_mem_reg *mem)
140 {
141         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
142
143         if (likely(man->io_reserve_fastpath))
144                 return;
145
146         if (bdev->driver->io_mem_reserve &&
147             --mem->bus.io_reserved_count == 0 &&
148             bdev->driver->io_mem_free)
149                 bdev->driver->io_mem_free(bdev, mem);
150
151 }
152
153 int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
154 {
155         struct ttm_mem_reg *mem = &bo->mem;
156         int ret;
157
158         if (!mem->bus.io_reserved_vm) {
159                 struct ttm_mem_type_manager *man =
160                         &bo->bdev->man[mem->mem_type];
161
162                 ret = ttm_mem_io_reserve(bo->bdev, mem);
163                 if (unlikely(ret != 0))
164                         return ret;
165                 mem->bus.io_reserved_vm = true;
166                 if (man->use_io_reserve_lru)
167                         list_add_tail(&bo->io_reserve_lru,
168                                       &man->io_reserve_lru);
169         }
170         return 0;
171 }
172
173 void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
174 {
175         struct ttm_mem_reg *mem = &bo->mem;
176
177         if (mem->bus.io_reserved_vm) {
178                 mem->bus.io_reserved_vm = false;
179                 list_del_init(&bo->io_reserve_lru);
180                 ttm_mem_io_free(bo->bdev, mem);
181         }
182 }
183
184 int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
185                         void **virtual)
186 {
187         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
188         int ret;
189         void *addr;
190
191         *virtual = NULL;
192         (void) ttm_mem_io_lock(man, false);
193         ret = ttm_mem_io_reserve(bdev, mem);
194         ttm_mem_io_unlock(man);
195         if (ret || !mem->bus.is_iomem)
196                 return ret;
197
198         if (mem->bus.addr) {
199                 addr = mem->bus.addr;
200         } else {
201                 if (mem->placement & TTM_PL_FLAG_WC)
202                         addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
203                 else
204                         addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
205                 if (!addr) {
206                         (void) ttm_mem_io_lock(man, false);
207                         ttm_mem_io_free(bdev, mem);
208                         ttm_mem_io_unlock(man);
209                         return -ENOMEM;
210                 }
211         }
212         *virtual = addr;
213         return 0;
214 }
215
216 void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
217                          void *virtual)
218 {
219         struct ttm_mem_type_manager *man;
220
221         man = &bdev->man[mem->mem_type];
222
223         if (virtual && mem->bus.addr == NULL)
224                 iounmap(virtual);
225         (void) ttm_mem_io_lock(man, false);
226         ttm_mem_io_free(bdev, mem);
227         ttm_mem_io_unlock(man);
228 }
229
230 static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
231 {
232         uint32_t *dstP =
233             (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
234         uint32_t *srcP =
235             (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
236
237         int i;
238         for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
239                 iowrite32(ioread32(srcP++), dstP++);
240         return 0;
241 }
242
243 static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
244                                 unsigned long page,
245                                 pgprot_t prot)
246 {
247         struct page *d = ttm->pages[page];
248         void *dst;
249
250         if (!d)
251                 return -ENOMEM;
252
253         src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
254
255 #ifdef CONFIG_X86
256         dst = kmap_atomic_prot(d, prot);
257 #else
258         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
259                 dst = vmap(&d, 1, 0, prot);
260         else
261                 dst = kmap(d);
262 #endif
263         if (!dst)
264                 return -ENOMEM;
265
266         memcpy_fromio(dst, src, PAGE_SIZE);
267
268 #ifdef CONFIG_X86
269         kunmap_atomic(dst);
270 #else
271         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
272                 vunmap(dst);
273         else
274                 kunmap(d);
275 #endif
276
277         return 0;
278 }
279
280 static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
281                                 unsigned long page,
282                                 pgprot_t prot)
283 {
284         struct page *s = ttm->pages[page];
285         void *src;
286
287         if (!s)
288                 return -ENOMEM;
289
290         dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
291 #ifdef CONFIG_X86
292         src = kmap_atomic_prot(s, prot);
293 #else
294         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
295                 src = vmap(&s, 1, 0, prot);
296         else
297                 src = kmap(s);
298 #endif
299         if (!src)
300                 return -ENOMEM;
301
302         memcpy_toio(dst, src, PAGE_SIZE);
303
304 #ifdef CONFIG_X86
305         kunmap_atomic(src);
306 #else
307         if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
308                 vunmap(src);
309         else
310                 kunmap(s);
311 #endif
312
313         return 0;
314 }
315
316 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
317                        bool evict, bool no_wait_gpu,
318                        struct ttm_mem_reg *new_mem)
319 {
320         struct ttm_bo_device *bdev = bo->bdev;
321         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
322         struct ttm_tt *ttm = bo->ttm;
323         struct ttm_mem_reg *old_mem = &bo->mem;
324         struct ttm_mem_reg old_copy = *old_mem;
325         void *old_iomap;
326         void *new_iomap;
327         int ret;
328         unsigned long i;
329         unsigned long page;
330         unsigned long add = 0;
331         int dir;
332
333         ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
334         if (ret)
335                 return ret;
336         ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
337         if (ret)
338                 goto out;
339
340         if (old_iomap == NULL && new_iomap == NULL)
341                 goto out2;
342         if (old_iomap == NULL && ttm == NULL)
343                 goto out2;
344
345         if (ttm->state == tt_unpopulated) {
346                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
347                 if (ret) {
348                         /* if we fail here don't nuke the mm node
349                          * as the bo still owns it */
350                         old_copy.mm_node = NULL;
351                         goto out1;
352                 }
353         }
354
355         add = 0;
356         dir = 1;
357
358         if ((old_mem->mem_type == new_mem->mem_type) &&
359             (new_mem->start < old_mem->start + old_mem->size)) {
360                 dir = -1;
361                 add = new_mem->num_pages - 1;
362         }
363
364         for (i = 0; i < new_mem->num_pages; ++i) {
365                 page = i * dir + add;
366                 if (old_iomap == NULL) {
367                         pgprot_t prot = ttm_io_prot(old_mem->placement,
368                                                     PAGE_KERNEL);
369                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
370                                                    prot);
371                 } else if (new_iomap == NULL) {
372                         pgprot_t prot = ttm_io_prot(new_mem->placement,
373                                                     PAGE_KERNEL);
374                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
375                                                    prot);
376                 } else
377                         ret = ttm_copy_io_page(new_iomap, old_iomap, page);
378                 if (ret) {
379                         /* failing here, means keep old copy as-is */
380                         old_copy.mm_node = NULL;
381                         goto out1;
382                 }
383         }
384         mb();
385 out2:
386         old_copy = *old_mem;
387         *old_mem = *new_mem;
388         new_mem->mm_node = NULL;
389
390         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
391                 ttm_tt_unbind(ttm);
392                 ttm_tt_destroy(ttm);
393                 bo->ttm = NULL;
394         }
395
396 out1:
397         ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
398 out:
399         ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
400         ttm_bo_mem_put(bo, &old_copy);
401         return ret;
402 }
403 EXPORT_SYMBOL(ttm_bo_move_memcpy);
404
405 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
406 {
407         kfree(bo);
408 }
409
410 /**
411  * ttm_buffer_object_transfer
412  *
413  * @bo: A pointer to a struct ttm_buffer_object.
414  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
415  * holding the data of @bo with the old placement.
416  *
417  * This is a utility function that may be called after an accelerated move
418  * has been scheduled. A new buffer object is created as a placeholder for
419  * the old data while it's being copied. When that buffer object is idle,
420  * it can be destroyed, releasing the space of the old placement.
421  * Returns:
422  * !0: Failure.
423  */
424
425 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
426                                       struct ttm_buffer_object **new_obj)
427 {
428         struct ttm_buffer_object *fbo;
429         struct ttm_bo_device *bdev = bo->bdev;
430         struct ttm_bo_driver *driver = bdev->driver;
431
432         fbo = kzalloc(sizeof(*fbo), GFP_KERNEL);
433         if (!fbo)
434                 return -ENOMEM;
435
436         *fbo = *bo;
437
438         /**
439          * Fix up members that we shouldn't copy directly:
440          * TODO: Explicit member copy would probably be better here.
441          */
442
443         init_waitqueue_head(&fbo->event_queue);
444         INIT_LIST_HEAD(&fbo->ddestroy);
445         INIT_LIST_HEAD(&fbo->lru);
446         INIT_LIST_HEAD(&fbo->swap);
447         INIT_LIST_HEAD(&fbo->io_reserve_lru);
448         fbo->vm_node = NULL;
449         atomic_set(&fbo->cpu_writers, 0);
450
451         fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
452         kref_init(&fbo->list_kref);
453         kref_init(&fbo->kref);
454         fbo->destroy = &ttm_transfered_destroy;
455         fbo->acc_size = 0;
456
457         *new_obj = fbo;
458         return 0;
459 }
460
461 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
462 {
463 #if defined(__i386__) || defined(__x86_64__)
464         if (caching_flags & TTM_PL_FLAG_WC)
465                 tmp = pgprot_writecombine(tmp);
466         else if (boot_cpu_data.x86 > 3)
467                 tmp = pgprot_noncached(tmp);
468
469 #elif defined(__powerpc__)
470         if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
471                 pgprot_val(tmp) |= _PAGE_NO_CACHE;
472                 if (caching_flags & TTM_PL_FLAG_UNCACHED)
473                         pgprot_val(tmp) |= _PAGE_GUARDED;
474         }
475 #endif
476 #if defined(__ia64__)
477         if (caching_flags & TTM_PL_FLAG_WC)
478                 tmp = pgprot_writecombine(tmp);
479         else
480                 tmp = pgprot_noncached(tmp);
481 #endif
482 #if defined(__sparc__) || defined(__mips__)
483         if (!(caching_flags & TTM_PL_FLAG_CACHED))
484                 tmp = pgprot_noncached(tmp);
485 #endif
486         return tmp;
487 }
488 EXPORT_SYMBOL(ttm_io_prot);
489
490 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
491                           unsigned long offset,
492                           unsigned long size,
493                           struct ttm_bo_kmap_obj *map)
494 {
495         struct ttm_mem_reg *mem = &bo->mem;
496
497         if (bo->mem.bus.addr) {
498                 map->bo_kmap_type = ttm_bo_map_premapped;
499                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
500         } else {
501                 map->bo_kmap_type = ttm_bo_map_iomap;
502                 if (mem->placement & TTM_PL_FLAG_WC)
503                         map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
504                                                   size);
505                 else
506                         map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
507                                                        size);
508         }
509         return (!map->virtual) ? -ENOMEM : 0;
510 }
511
512 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
513                            unsigned long start_page,
514                            unsigned long num_pages,
515                            struct ttm_bo_kmap_obj *map)
516 {
517         struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
518         struct ttm_tt *ttm = bo->ttm;
519         int ret;
520
521         BUG_ON(!ttm);
522
523         if (ttm->state == tt_unpopulated) {
524                 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
525                 if (ret)
526                         return ret;
527         }
528
529         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
530                 /*
531                  * We're mapping a single page, and the desired
532                  * page protection is consistent with the bo.
533                  */
534
535                 map->bo_kmap_type = ttm_bo_map_kmap;
536                 map->page = ttm->pages[start_page];
537                 map->virtual = kmap(map->page);
538         } else {
539                 /*
540                  * We need to use vmap to get the desired page protection
541                  * or to make the buffer object look contiguous.
542                  */
543                 prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
544                         PAGE_KERNEL :
545                         ttm_io_prot(mem->placement, PAGE_KERNEL);
546                 map->bo_kmap_type = ttm_bo_map_vmap;
547                 map->virtual = vmap(ttm->pages + start_page, num_pages,
548                                     0, prot);
549         }
550         return (!map->virtual) ? -ENOMEM : 0;
551 }
552
553 int ttm_bo_kmap(struct ttm_buffer_object *bo,
554                 unsigned long start_page, unsigned long num_pages,
555                 struct ttm_bo_kmap_obj *map)
556 {
557         struct ttm_mem_type_manager *man =
558                 &bo->bdev->man[bo->mem.mem_type];
559         unsigned long offset, size;
560         int ret;
561
562         BUG_ON(!list_empty(&bo->swap));
563         map->virtual = NULL;
564         map->bo = bo;
565         if (num_pages > bo->num_pages)
566                 return -EINVAL;
567         if (start_page > bo->num_pages)
568                 return -EINVAL;
569 #if 0
570         if (num_pages > 1 && !DRM_SUSER(DRM_CURPROC))
571                 return -EPERM;
572 #endif
573         (void) ttm_mem_io_lock(man, false);
574         ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
575         ttm_mem_io_unlock(man);
576         if (ret)
577                 return ret;
578         if (!bo->mem.bus.is_iomem) {
579                 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
580         } else {
581                 offset = start_page << PAGE_SHIFT;
582                 size = num_pages << PAGE_SHIFT;
583                 return ttm_bo_ioremap(bo, offset, size, map);
584         }
585 }
586 EXPORT_SYMBOL(ttm_bo_kmap);
587
588 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
589 {
590         struct ttm_buffer_object *bo = map->bo;
591         struct ttm_mem_type_manager *man =
592                 &bo->bdev->man[bo->mem.mem_type];
593
594         if (!map->virtual)
595                 return;
596         switch (map->bo_kmap_type) {
597         case ttm_bo_map_iomap:
598                 iounmap(map->virtual);
599                 break;
600         case ttm_bo_map_vmap:
601                 vunmap(map->virtual);
602                 break;
603         case ttm_bo_map_kmap:
604                 kunmap(map->page);
605                 break;
606         case ttm_bo_map_premapped:
607                 break;
608         default:
609                 BUG();
610         }
611         (void) ttm_mem_io_lock(man, false);
612         ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
613         ttm_mem_io_unlock(man);
614         map->virtual = NULL;
615         map->page = NULL;
616 }
617 EXPORT_SYMBOL(ttm_bo_kunmap);
618
619 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
620                               void *sync_obj,
621                               bool evict,
622                               bool no_wait_gpu,
623                               struct ttm_mem_reg *new_mem)
624 {
625         struct ttm_bo_device *bdev = bo->bdev;
626         struct ttm_bo_driver *driver = bdev->driver;
627         struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
628         struct ttm_mem_reg *old_mem = &bo->mem;
629         int ret;
630         struct ttm_buffer_object *ghost_obj;
631         void *tmp_obj = NULL;
632
633         spin_lock(&bdev->fence_lock);
634         if (bo->sync_obj) {
635                 tmp_obj = bo->sync_obj;
636                 bo->sync_obj = NULL;
637         }
638         bo->sync_obj = driver->sync_obj_ref(sync_obj);
639         if (evict) {
640                 ret = ttm_bo_wait(bo, false, false, false);
641                 spin_unlock(&bdev->fence_lock);
642                 if (tmp_obj)
643                         driver->sync_obj_unref(&tmp_obj);
644                 if (ret)
645                         return ret;
646
647                 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
648                     (bo->ttm != NULL)) {
649                         ttm_tt_unbind(bo->ttm);
650                         ttm_tt_destroy(bo->ttm);
651                         bo->ttm = NULL;
652                 }
653                 ttm_bo_free_old_node(bo);
654         } else {
655                 /**
656                  * This should help pipeline ordinary buffer moves.
657                  *
658                  * Hang old buffer memory on a new buffer object,
659                  * and leave it to be released when the GPU
660                  * operation has completed.
661                  */
662
663                 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
664
665                 /* ttm_buffer_object_transfer accesses bo->sync_obj */
666                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
667                 spin_unlock(&bdev->fence_lock);
668                 if (tmp_obj)
669                         driver->sync_obj_unref(&tmp_obj);
670
671                 if (ret)
672                         return ret;
673
674                 /**
675                  * If we're not moving to fixed memory, the TTM object
676                  * needs to stay alive. Otherwhise hang it on the ghost
677                  * bo to be unbound and destroyed.
678                  */
679
680                 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
681                         ghost_obj->ttm = NULL;
682                 else
683                         bo->ttm = NULL;
684
685                 ttm_bo_unreserve(ghost_obj);
686                 ttm_bo_unref(&ghost_obj);
687         }
688
689         *old_mem = *new_mem;
690         new_mem->mm_node = NULL;
691
692         return 0;
693 }
694 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);