Loading...
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 "ttm/ttm_bo_driver.h"
32#include "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
40void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
41{
42 ttm_bo_mem_put(bo, &bo->mem);
43}
44
45int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
46 bool evict, bool no_wait_reserve,
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}
76EXPORT_SYMBOL(ttm_bo_move_ttm);
77
78int 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
90void 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
98static 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
114static 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) {
127retry:
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
138static 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
153int 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
173void 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
184int 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
216void 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
230static 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
243static 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_tt_get_page(ttm, 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
280static 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_tt_get_page(ttm, 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
316int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
317 bool evict, bool no_wait_reserve, 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 add = 0;
346 dir = 1;
347
348 if ((old_mem->mem_type == new_mem->mem_type) &&
349 (new_mem->start < old_mem->start + old_mem->size)) {
350 dir = -1;
351 add = new_mem->num_pages - 1;
352 }
353
354 for (i = 0; i < new_mem->num_pages; ++i) {
355 page = i * dir + add;
356 if (old_iomap == NULL) {
357 pgprot_t prot = ttm_io_prot(old_mem->placement,
358 PAGE_KERNEL);
359 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
360 prot);
361 } else if (new_iomap == NULL) {
362 pgprot_t prot = ttm_io_prot(new_mem->placement,
363 PAGE_KERNEL);
364 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
365 prot);
366 } else
367 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
368 if (ret)
369 goto out1;
370 }
371 mb();
372out2:
373 old_copy = *old_mem;
374 *old_mem = *new_mem;
375 new_mem->mm_node = NULL;
376
377 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
378 ttm_tt_unbind(ttm);
379 ttm_tt_destroy(ttm);
380 bo->ttm = NULL;
381 }
382
383out1:
384 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
385out:
386 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
387 ttm_bo_mem_put(bo, &old_copy);
388 return ret;
389}
390EXPORT_SYMBOL(ttm_bo_move_memcpy);
391
392static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
393{
394 kfree(bo);
395}
396
397/**
398 * ttm_buffer_object_transfer
399 *
400 * @bo: A pointer to a struct ttm_buffer_object.
401 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
402 * holding the data of @bo with the old placement.
403 *
404 * This is a utility function that may be called after an accelerated move
405 * has been scheduled. A new buffer object is created as a placeholder for
406 * the old data while it's being copied. When that buffer object is idle,
407 * it can be destroyed, releasing the space of the old placement.
408 * Returns:
409 * !0: Failure.
410 */
411
412static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
413 struct ttm_buffer_object **new_obj)
414{
415 struct ttm_buffer_object *fbo;
416 struct ttm_bo_device *bdev = bo->bdev;
417 struct ttm_bo_driver *driver = bdev->driver;
418
419 fbo = kzalloc(sizeof(*fbo), GFP_KERNEL);
420 if (!fbo)
421 return -ENOMEM;
422
423 *fbo = *bo;
424
425 /**
426 * Fix up members that we shouldn't copy directly:
427 * TODO: Explicit member copy would probably be better here.
428 */
429
430 init_waitqueue_head(&fbo->event_queue);
431 INIT_LIST_HEAD(&fbo->ddestroy);
432 INIT_LIST_HEAD(&fbo->lru);
433 INIT_LIST_HEAD(&fbo->swap);
434 INIT_LIST_HEAD(&fbo->io_reserve_lru);
435 fbo->vm_node = NULL;
436 atomic_set(&fbo->cpu_writers, 0);
437
438 fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
439 kref_init(&fbo->list_kref);
440 kref_init(&fbo->kref);
441 fbo->destroy = &ttm_transfered_destroy;
442
443 *new_obj = fbo;
444 return 0;
445}
446
447pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
448{
449#if defined(__i386__) || defined(__x86_64__)
450 if (caching_flags & TTM_PL_FLAG_WC)
451 tmp = pgprot_writecombine(tmp);
452 else if (boot_cpu_data.x86 > 3)
453 tmp = pgprot_noncached(tmp);
454
455#elif defined(__powerpc__)
456 if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
457 pgprot_val(tmp) |= _PAGE_NO_CACHE;
458 if (caching_flags & TTM_PL_FLAG_UNCACHED)
459 pgprot_val(tmp) |= _PAGE_GUARDED;
460 }
461#endif
462#if defined(__ia64__)
463 if (caching_flags & TTM_PL_FLAG_WC)
464 tmp = pgprot_writecombine(tmp);
465 else
466 tmp = pgprot_noncached(tmp);
467#endif
468#if defined(__sparc__)
469 if (!(caching_flags & TTM_PL_FLAG_CACHED))
470 tmp = pgprot_noncached(tmp);
471#endif
472 return tmp;
473}
474EXPORT_SYMBOL(ttm_io_prot);
475
476static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
477 unsigned long offset,
478 unsigned long size,
479 struct ttm_bo_kmap_obj *map)
480{
481 struct ttm_mem_reg *mem = &bo->mem;
482
483 if (bo->mem.bus.addr) {
484 map->bo_kmap_type = ttm_bo_map_premapped;
485 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
486 } else {
487 map->bo_kmap_type = ttm_bo_map_iomap;
488 if (mem->placement & TTM_PL_FLAG_WC)
489 map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
490 size);
491 else
492 map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
493 size);
494 }
495 return (!map->virtual) ? -ENOMEM : 0;
496}
497
498static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
499 unsigned long start_page,
500 unsigned long num_pages,
501 struct ttm_bo_kmap_obj *map)
502{
503 struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
504 struct ttm_tt *ttm = bo->ttm;
505 struct page *d;
506 int i;
507
508 BUG_ON(!ttm);
509 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
510 /*
511 * We're mapping a single page, and the desired
512 * page protection is consistent with the bo.
513 */
514
515 map->bo_kmap_type = ttm_bo_map_kmap;
516 map->page = ttm_tt_get_page(ttm, start_page);
517 map->virtual = kmap(map->page);
518 } else {
519 /*
520 * Populate the part we're mapping;
521 */
522 for (i = start_page; i < start_page + num_pages; ++i) {
523 d = ttm_tt_get_page(ttm, i);
524 if (!d)
525 return -ENOMEM;
526 }
527
528 /*
529 * We need to use vmap to get the desired page protection
530 * or to make the buffer object look contiguous.
531 */
532 prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
533 PAGE_KERNEL :
534 ttm_io_prot(mem->placement, PAGE_KERNEL);
535 map->bo_kmap_type = ttm_bo_map_vmap;
536 map->virtual = vmap(ttm->pages + start_page, num_pages,
537 0, prot);
538 }
539 return (!map->virtual) ? -ENOMEM : 0;
540}
541
542int ttm_bo_kmap(struct ttm_buffer_object *bo,
543 unsigned long start_page, unsigned long num_pages,
544 struct ttm_bo_kmap_obj *map)
545{
546 struct ttm_mem_type_manager *man =
547 &bo->bdev->man[bo->mem.mem_type];
548 unsigned long offset, size;
549 int ret;
550
551 BUG_ON(!list_empty(&bo->swap));
552 map->virtual = NULL;
553 map->bo = bo;
554 if (num_pages > bo->num_pages)
555 return -EINVAL;
556 if (start_page > bo->num_pages)
557 return -EINVAL;
558#if 0
559 if (num_pages > 1 && !DRM_SUSER(DRM_CURPROC))
560 return -EPERM;
561#endif
562 (void) ttm_mem_io_lock(man, false);
563 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
564 ttm_mem_io_unlock(man);
565 if (ret)
566 return ret;
567 if (!bo->mem.bus.is_iomem) {
568 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
569 } else {
570 offset = start_page << PAGE_SHIFT;
571 size = num_pages << PAGE_SHIFT;
572 return ttm_bo_ioremap(bo, offset, size, map);
573 }
574}
575EXPORT_SYMBOL(ttm_bo_kmap);
576
577void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
578{
579 struct ttm_buffer_object *bo = map->bo;
580 struct ttm_mem_type_manager *man =
581 &bo->bdev->man[bo->mem.mem_type];
582
583 if (!map->virtual)
584 return;
585 switch (map->bo_kmap_type) {
586 case ttm_bo_map_iomap:
587 iounmap(map->virtual);
588 break;
589 case ttm_bo_map_vmap:
590 vunmap(map->virtual);
591 break;
592 case ttm_bo_map_kmap:
593 kunmap(map->page);
594 break;
595 case ttm_bo_map_premapped:
596 break;
597 default:
598 BUG();
599 }
600 (void) ttm_mem_io_lock(man, false);
601 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
602 ttm_mem_io_unlock(man);
603 map->virtual = NULL;
604 map->page = NULL;
605}
606EXPORT_SYMBOL(ttm_bo_kunmap);
607
608int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
609 void *sync_obj,
610 void *sync_obj_arg,
611 bool evict, bool no_wait_reserve,
612 bool no_wait_gpu,
613 struct ttm_mem_reg *new_mem)
614{
615 struct ttm_bo_device *bdev = bo->bdev;
616 struct ttm_bo_driver *driver = bdev->driver;
617 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
618 struct ttm_mem_reg *old_mem = &bo->mem;
619 int ret;
620 struct ttm_buffer_object *ghost_obj;
621 void *tmp_obj = NULL;
622
623 spin_lock(&bdev->fence_lock);
624 if (bo->sync_obj) {
625 tmp_obj = bo->sync_obj;
626 bo->sync_obj = NULL;
627 }
628 bo->sync_obj = driver->sync_obj_ref(sync_obj);
629 bo->sync_obj_arg = sync_obj_arg;
630 if (evict) {
631 ret = ttm_bo_wait(bo, false, false, false);
632 spin_unlock(&bdev->fence_lock);
633 if (tmp_obj)
634 driver->sync_obj_unref(&tmp_obj);
635 if (ret)
636 return ret;
637
638 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
639 (bo->ttm != NULL)) {
640 ttm_tt_unbind(bo->ttm);
641 ttm_tt_destroy(bo->ttm);
642 bo->ttm = NULL;
643 }
644 ttm_bo_free_old_node(bo);
645 } else {
646 /**
647 * This should help pipeline ordinary buffer moves.
648 *
649 * Hang old buffer memory on a new buffer object,
650 * and leave it to be released when the GPU
651 * operation has completed.
652 */
653
654 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
655 spin_unlock(&bdev->fence_lock);
656 if (tmp_obj)
657 driver->sync_obj_unref(&tmp_obj);
658
659 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
660 if (ret)
661 return ret;
662
663 /**
664 * If we're not moving to fixed memory, the TTM object
665 * needs to stay alive. Otherwhise hang it on the ghost
666 * bo to be unbound and destroyed.
667 */
668
669 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
670 ghost_obj->ttm = NULL;
671 else
672 bo->ttm = NULL;
673
674 ttm_bo_unreserve(ghost_obj);
675 ttm_bo_unref(&ghost_obj);
676 }
677
678 *old_mem = *new_mem;
679 new_mem->mm_node = NULL;
680
681 return 0;
682}
683EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#include <drm/ttm/ttm_bo_driver.h>
33#include <drm/ttm/ttm_placement.h>
34#include <drm/drm_vma_manager.h>
35#include <linux/io.h>
36#include <linux/highmem.h>
37#include <linux/wait.h>
38#include <linux/slab.h>
39#include <linux/vmalloc.h>
40#include <linux/module.h>
41#include <linux/dma-resv.h>
42
43struct ttm_transfer_obj {
44 struct ttm_buffer_object base;
45 struct ttm_buffer_object *bo;
46};
47
48void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
49{
50 ttm_bo_mem_put(bo, &bo->mem);
51}
52
53int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
54 struct ttm_operation_ctx *ctx,
55 struct ttm_mem_reg *new_mem)
56{
57 struct ttm_tt *ttm = bo->ttm;
58 struct ttm_mem_reg *old_mem = &bo->mem;
59 int ret;
60
61 if (old_mem->mem_type != TTM_PL_SYSTEM) {
62 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
63
64 if (unlikely(ret != 0)) {
65 if (ret != -ERESTARTSYS)
66 pr_err("Failed to expire sync object before unbinding TTM\n");
67 return ret;
68 }
69
70 ttm_tt_unbind(ttm);
71 ttm_bo_free_old_node(bo);
72 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
73 TTM_PL_MASK_MEM);
74 old_mem->mem_type = TTM_PL_SYSTEM;
75 }
76
77 ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
78 if (unlikely(ret != 0))
79 return ret;
80
81 if (new_mem->mem_type != TTM_PL_SYSTEM) {
82 ret = ttm_tt_bind(ttm, new_mem, ctx);
83 if (unlikely(ret != 0))
84 return ret;
85 }
86
87 *old_mem = *new_mem;
88 new_mem->mm_node = NULL;
89
90 return 0;
91}
92EXPORT_SYMBOL(ttm_bo_move_ttm);
93
94int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
95{
96 if (likely(!man->use_io_reserve_lru))
97 return 0;
98
99 if (interruptible)
100 return mutex_lock_interruptible(&man->io_reserve_mutex);
101
102 mutex_lock(&man->io_reserve_mutex);
103 return 0;
104}
105
106void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
107{
108 if (likely(!man->use_io_reserve_lru))
109 return;
110
111 mutex_unlock(&man->io_reserve_mutex);
112}
113
114static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
115{
116 struct ttm_buffer_object *bo;
117
118 bo = list_first_entry_or_null(&man->io_reserve_lru,
119 struct ttm_buffer_object,
120 io_reserve_lru);
121 if (!bo)
122 return -ENOSPC;
123
124 list_del_init(&bo->io_reserve_lru);
125 ttm_bo_unmap_virtual_locked(bo);
126 return 0;
127}
128
129int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
130 struct ttm_mem_reg *mem)
131{
132 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
133 int ret;
134
135 if (mem->bus.io_reserved_count++)
136 return 0;
137
138 if (!bdev->driver->io_mem_reserve)
139 return 0;
140
141retry:
142 ret = bdev->driver->io_mem_reserve(bdev, mem);
143 if (ret == -ENOSPC) {
144 ret = ttm_mem_io_evict(man);
145 if (ret == 0)
146 goto retry;
147 }
148 return ret;
149}
150
151void ttm_mem_io_free(struct ttm_bo_device *bdev,
152 struct ttm_mem_reg *mem)
153{
154 if (--mem->bus.io_reserved_count)
155 return;
156
157 if (!bdev->driver->io_mem_free)
158 return;
159
160 bdev->driver->io_mem_free(bdev, mem);
161}
162
163int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
164{
165 struct ttm_mem_type_manager *man = &bo->bdev->man[bo->mem.mem_type];
166 struct ttm_mem_reg *mem = &bo->mem;
167 int ret;
168
169 if (mem->bus.io_reserved_vm)
170 return 0;
171
172 ret = ttm_mem_io_reserve(bo->bdev, mem);
173 if (unlikely(ret != 0))
174 return ret;
175 mem->bus.io_reserved_vm = true;
176 if (man->use_io_reserve_lru)
177 list_add_tail(&bo->io_reserve_lru,
178 &man->io_reserve_lru);
179 return 0;
180}
181
182void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
183{
184 struct ttm_mem_reg *mem = &bo->mem;
185
186 if (!mem->bus.io_reserved_vm)
187 return;
188
189 mem->bus.io_reserved_vm = false;
190 list_del_init(&bo->io_reserve_lru);
191 ttm_mem_io_free(bo->bdev, mem);
192}
193
194static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev,
195 struct ttm_mem_reg *mem,
196 void **virtual)
197{
198 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
199 int ret;
200 void *addr;
201
202 *virtual = NULL;
203 (void) ttm_mem_io_lock(man, false);
204 ret = ttm_mem_io_reserve(bdev, mem);
205 ttm_mem_io_unlock(man);
206 if (ret || !mem->bus.is_iomem)
207 return ret;
208
209 if (mem->bus.addr) {
210 addr = mem->bus.addr;
211 } else {
212 if (mem->placement & TTM_PL_FLAG_WC)
213 addr = ioremap_wc(mem->bus.base + mem->bus.offset,
214 mem->bus.size);
215 else
216 addr = ioremap(mem->bus.base + mem->bus.offset,
217 mem->bus.size);
218 if (!addr) {
219 (void) ttm_mem_io_lock(man, false);
220 ttm_mem_io_free(bdev, mem);
221 ttm_mem_io_unlock(man);
222 return -ENOMEM;
223 }
224 }
225 *virtual = addr;
226 return 0;
227}
228
229static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev,
230 struct ttm_mem_reg *mem,
231 void *virtual)
232{
233 struct ttm_mem_type_manager *man;
234
235 man = &bdev->man[mem->mem_type];
236
237 if (virtual && mem->bus.addr == NULL)
238 iounmap(virtual);
239 (void) ttm_mem_io_lock(man, false);
240 ttm_mem_io_free(bdev, mem);
241 ttm_mem_io_unlock(man);
242}
243
244static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
245{
246 uint32_t *dstP =
247 (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
248 uint32_t *srcP =
249 (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
250
251 int i;
252 for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
253 iowrite32(ioread32(srcP++), dstP++);
254 return 0;
255}
256
257static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
258 unsigned long page,
259 pgprot_t prot)
260{
261 struct page *d = ttm->pages[page];
262 void *dst;
263
264 if (!d)
265 return -ENOMEM;
266
267 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
268 dst = kmap_atomic_prot(d, prot);
269 if (!dst)
270 return -ENOMEM;
271
272 memcpy_fromio(dst, src, PAGE_SIZE);
273
274 kunmap_atomic(dst);
275
276 return 0;
277}
278
279static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
280 unsigned long page,
281 pgprot_t prot)
282{
283 struct page *s = ttm->pages[page];
284 void *src;
285
286 if (!s)
287 return -ENOMEM;
288
289 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
290 src = kmap_atomic_prot(s, prot);
291 if (!src)
292 return -ENOMEM;
293
294 memcpy_toio(dst, src, PAGE_SIZE);
295
296 kunmap_atomic(src);
297
298 return 0;
299}
300
301int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
302 struct ttm_operation_ctx *ctx,
303 struct ttm_mem_reg *new_mem)
304{
305 struct ttm_bo_device *bdev = bo->bdev;
306 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
307 struct ttm_tt *ttm = bo->ttm;
308 struct ttm_mem_reg *old_mem = &bo->mem;
309 struct ttm_mem_reg old_copy = *old_mem;
310 void *old_iomap;
311 void *new_iomap;
312 int ret;
313 unsigned long i;
314 unsigned long page;
315 unsigned long add = 0;
316 int dir;
317
318 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
319 if (ret)
320 return ret;
321
322 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
323 if (ret)
324 return ret;
325 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
326 if (ret)
327 goto out;
328
329 /*
330 * Single TTM move. NOP.
331 */
332 if (old_iomap == NULL && new_iomap == NULL)
333 goto out2;
334
335 /*
336 * Don't move nonexistent data. Clear destination instead.
337 */
338 if (old_iomap == NULL &&
339 (ttm == NULL || (ttm->state == tt_unpopulated &&
340 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
341 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
342 goto out2;
343 }
344
345 /*
346 * TTM might be null for moves within the same region.
347 */
348 if (ttm) {
349 ret = ttm_tt_populate(ttm, ctx);
350 if (ret)
351 goto out1;
352 }
353
354 add = 0;
355 dir = 1;
356
357 if ((old_mem->mem_type == new_mem->mem_type) &&
358 (new_mem->start < old_mem->start + old_mem->size)) {
359 dir = -1;
360 add = new_mem->num_pages - 1;
361 }
362
363 for (i = 0; i < new_mem->num_pages; ++i) {
364 page = i * dir + add;
365 if (old_iomap == NULL) {
366 pgprot_t prot = ttm_io_prot(old_mem->placement,
367 PAGE_KERNEL);
368 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
369 prot);
370 } else if (new_iomap == NULL) {
371 pgprot_t prot = ttm_io_prot(new_mem->placement,
372 PAGE_KERNEL);
373 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
374 prot);
375 } else {
376 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
377 }
378 if (ret)
379 goto out1;
380 }
381 mb();
382out2:
383 old_copy = *old_mem;
384 *old_mem = *new_mem;
385 new_mem->mm_node = NULL;
386
387 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
388 ttm_tt_destroy(ttm);
389 bo->ttm = NULL;
390 }
391
392out1:
393 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
394out:
395 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
396
397 /*
398 * On error, keep the mm node!
399 */
400 if (!ret)
401 ttm_bo_mem_put(bo, &old_copy);
402 return ret;
403}
404EXPORT_SYMBOL(ttm_bo_move_memcpy);
405
406static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
407{
408 struct ttm_transfer_obj *fbo;
409
410 fbo = container_of(bo, struct ttm_transfer_obj, base);
411 ttm_bo_put(fbo->bo);
412 kfree(fbo);
413}
414
415/**
416 * ttm_buffer_object_transfer
417 *
418 * @bo: A pointer to a struct ttm_buffer_object.
419 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
420 * holding the data of @bo with the old placement.
421 *
422 * This is a utility function that may be called after an accelerated move
423 * has been scheduled. A new buffer object is created as a placeholder for
424 * the old data while it's being copied. When that buffer object is idle,
425 * it can be destroyed, releasing the space of the old placement.
426 * Returns:
427 * !0: Failure.
428 */
429
430static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
431 struct ttm_buffer_object **new_obj)
432{
433 struct ttm_transfer_obj *fbo;
434 int ret;
435
436 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
437 if (!fbo)
438 return -ENOMEM;
439
440 fbo->base = *bo;
441 fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
442
443 ttm_bo_get(bo);
444 fbo->bo = bo;
445
446 /**
447 * Fix up members that we shouldn't copy directly:
448 * TODO: Explicit member copy would probably be better here.
449 */
450
451 atomic_inc(&ttm_bo_glob.bo_count);
452 INIT_LIST_HEAD(&fbo->base.ddestroy);
453 INIT_LIST_HEAD(&fbo->base.lru);
454 INIT_LIST_HEAD(&fbo->base.swap);
455 INIT_LIST_HEAD(&fbo->base.io_reserve_lru);
456 fbo->base.moving = NULL;
457 drm_vma_node_reset(&fbo->base.base.vma_node);
458
459 kref_init(&fbo->base.kref);
460 fbo->base.destroy = &ttm_transfered_destroy;
461 fbo->base.acc_size = 0;
462 if (bo->type != ttm_bo_type_sg)
463 fbo->base.base.resv = &fbo->base.base._resv;
464
465 dma_resv_init(&fbo->base.base._resv);
466 fbo->base.base.dev = NULL;
467 ret = dma_resv_trylock(&fbo->base.base._resv);
468 WARN_ON(!ret);
469
470 *new_obj = &fbo->base;
471 return 0;
472}
473
474pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
475{
476 /* Cached mappings need no adjustment */
477 if (caching_flags & TTM_PL_FLAG_CACHED)
478 return tmp;
479
480#if defined(__i386__) || defined(__x86_64__)
481 if (caching_flags & TTM_PL_FLAG_WC)
482 tmp = pgprot_writecombine(tmp);
483 else if (boot_cpu_data.x86 > 3)
484 tmp = pgprot_noncached(tmp);
485#endif
486#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
487 defined(__powerpc__) || defined(__mips__)
488 if (caching_flags & TTM_PL_FLAG_WC)
489 tmp = pgprot_writecombine(tmp);
490 else
491 tmp = pgprot_noncached(tmp);
492#endif
493#if defined(__sparc__)
494 tmp = pgprot_noncached(tmp);
495#endif
496 return tmp;
497}
498EXPORT_SYMBOL(ttm_io_prot);
499
500static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
501 unsigned long offset,
502 unsigned long size,
503 struct ttm_bo_kmap_obj *map)
504{
505 struct ttm_mem_reg *mem = &bo->mem;
506
507 if (bo->mem.bus.addr) {
508 map->bo_kmap_type = ttm_bo_map_premapped;
509 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
510 } else {
511 map->bo_kmap_type = ttm_bo_map_iomap;
512 if (mem->placement & TTM_PL_FLAG_WC)
513 map->virtual = ioremap_wc(bo->mem.bus.base +
514 bo->mem.bus.offset + offset,
515 size);
516 else
517 map->virtual = ioremap(bo->mem.bus.base +
518 bo->mem.bus.offset + offset,
519 size);
520 }
521 return (!map->virtual) ? -ENOMEM : 0;
522}
523
524static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
525 unsigned long start_page,
526 unsigned long num_pages,
527 struct ttm_bo_kmap_obj *map)
528{
529 struct ttm_mem_reg *mem = &bo->mem;
530 struct ttm_operation_ctx ctx = {
531 .interruptible = false,
532 .no_wait_gpu = false
533 };
534 struct ttm_tt *ttm = bo->ttm;
535 pgprot_t prot;
536 int ret;
537
538 BUG_ON(!ttm);
539
540 ret = ttm_tt_populate(ttm, &ctx);
541 if (ret)
542 return ret;
543
544 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
545 /*
546 * We're mapping a single page, and the desired
547 * page protection is consistent with the bo.
548 */
549
550 map->bo_kmap_type = ttm_bo_map_kmap;
551 map->page = ttm->pages[start_page];
552 map->virtual = kmap(map->page);
553 } else {
554 /*
555 * We need to use vmap to get the desired page protection
556 * or to make the buffer object look contiguous.
557 */
558 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
559 map->bo_kmap_type = ttm_bo_map_vmap;
560 map->virtual = vmap(ttm->pages + start_page, num_pages,
561 0, prot);
562 }
563 return (!map->virtual) ? -ENOMEM : 0;
564}
565
566int ttm_bo_kmap(struct ttm_buffer_object *bo,
567 unsigned long start_page, unsigned long num_pages,
568 struct ttm_bo_kmap_obj *map)
569{
570 struct ttm_mem_type_manager *man =
571 &bo->bdev->man[bo->mem.mem_type];
572 unsigned long offset, size;
573 int ret;
574
575 map->virtual = NULL;
576 map->bo = bo;
577 if (num_pages > bo->num_pages)
578 return -EINVAL;
579 if (start_page > bo->num_pages)
580 return -EINVAL;
581
582 (void) ttm_mem_io_lock(man, false);
583 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
584 ttm_mem_io_unlock(man);
585 if (ret)
586 return ret;
587 if (!bo->mem.bus.is_iomem) {
588 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
589 } else {
590 offset = start_page << PAGE_SHIFT;
591 size = num_pages << PAGE_SHIFT;
592 return ttm_bo_ioremap(bo, offset, size, map);
593 }
594}
595EXPORT_SYMBOL(ttm_bo_kmap);
596
597void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
598{
599 struct ttm_buffer_object *bo = map->bo;
600 struct ttm_mem_type_manager *man =
601 &bo->bdev->man[bo->mem.mem_type];
602
603 if (!map->virtual)
604 return;
605 switch (map->bo_kmap_type) {
606 case ttm_bo_map_iomap:
607 iounmap(map->virtual);
608 break;
609 case ttm_bo_map_vmap:
610 vunmap(map->virtual);
611 break;
612 case ttm_bo_map_kmap:
613 kunmap(map->page);
614 break;
615 case ttm_bo_map_premapped:
616 break;
617 default:
618 BUG();
619 }
620 (void) ttm_mem_io_lock(man, false);
621 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
622 ttm_mem_io_unlock(man);
623 map->virtual = NULL;
624 map->page = NULL;
625}
626EXPORT_SYMBOL(ttm_bo_kunmap);
627
628int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
629 struct dma_fence *fence,
630 bool evict,
631 struct ttm_mem_reg *new_mem)
632{
633 struct ttm_bo_device *bdev = bo->bdev;
634 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
635 struct ttm_mem_reg *old_mem = &bo->mem;
636 int ret;
637 struct ttm_buffer_object *ghost_obj;
638
639 dma_resv_add_excl_fence(bo->base.resv, fence);
640 if (evict) {
641 ret = ttm_bo_wait(bo, false, false);
642 if (ret)
643 return ret;
644
645 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
646 ttm_tt_destroy(bo->ttm);
647 bo->ttm = NULL;
648 }
649 ttm_bo_free_old_node(bo);
650 } else {
651 /**
652 * This should help pipeline ordinary buffer moves.
653 *
654 * Hang old buffer memory on a new buffer object,
655 * and leave it to be released when the GPU
656 * operation has completed.
657 */
658
659 dma_fence_put(bo->moving);
660 bo->moving = dma_fence_get(fence);
661
662 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
663 if (ret)
664 return ret;
665
666 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
667
668 /**
669 * If we're not moving to fixed memory, the TTM object
670 * needs to stay alive. Otherwhise hang it on the ghost
671 * bo to be unbound and destroyed.
672 */
673
674 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
675 ghost_obj->ttm = NULL;
676 else
677 bo->ttm = NULL;
678
679 dma_resv_unlock(&ghost_obj->base._resv);
680 ttm_bo_put(ghost_obj);
681 }
682
683 *old_mem = *new_mem;
684 new_mem->mm_node = NULL;
685
686 return 0;
687}
688EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
689
690int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
691 struct dma_fence *fence, bool evict,
692 struct ttm_mem_reg *new_mem)
693{
694 struct ttm_bo_device *bdev = bo->bdev;
695 struct ttm_mem_reg *old_mem = &bo->mem;
696
697 struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
698 struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
699
700 int ret;
701
702 dma_resv_add_excl_fence(bo->base.resv, fence);
703
704 if (!evict) {
705 struct ttm_buffer_object *ghost_obj;
706
707 /**
708 * This should help pipeline ordinary buffer moves.
709 *
710 * Hang old buffer memory on a new buffer object,
711 * and leave it to be released when the GPU
712 * operation has completed.
713 */
714
715 dma_fence_put(bo->moving);
716 bo->moving = dma_fence_get(fence);
717
718 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
719 if (ret)
720 return ret;
721
722 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
723
724 /**
725 * If we're not moving to fixed memory, the TTM object
726 * needs to stay alive. Otherwhise hang it on the ghost
727 * bo to be unbound and destroyed.
728 */
729
730 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
731 ghost_obj->ttm = NULL;
732 else
733 bo->ttm = NULL;
734
735 dma_resv_unlock(&ghost_obj->base._resv);
736 ttm_bo_put(ghost_obj);
737
738 } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
739
740 /**
741 * BO doesn't have a TTM we need to bind/unbind. Just remember
742 * this eviction and free up the allocation
743 */
744
745 spin_lock(&from->move_lock);
746 if (!from->move || dma_fence_is_later(fence, from->move)) {
747 dma_fence_put(from->move);
748 from->move = dma_fence_get(fence);
749 }
750 spin_unlock(&from->move_lock);
751
752 ttm_bo_free_old_node(bo);
753
754 dma_fence_put(bo->moving);
755 bo->moving = dma_fence_get(fence);
756
757 } else {
758 /**
759 * Last resort, wait for the move to be completed.
760 *
761 * Should never happen in pratice.
762 */
763
764 ret = ttm_bo_wait(bo, false, false);
765 if (ret)
766 return ret;
767
768 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
769 ttm_tt_destroy(bo->ttm);
770 bo->ttm = NULL;
771 }
772 ttm_bo_free_old_node(bo);
773 }
774
775 *old_mem = *new_mem;
776 new_mem->mm_node = NULL;
777
778 return 0;
779}
780EXPORT_SYMBOL(ttm_bo_pipeline_move);
781
782int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
783{
784 struct ttm_buffer_object *ghost;
785 int ret;
786
787 ret = ttm_buffer_object_transfer(bo, &ghost);
788 if (ret)
789 return ret;
790
791 ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
792 /* Last resort, wait for the BO to be idle when we are OOM */
793 if (ret)
794 ttm_bo_wait(bo, false, false);
795
796 memset(&bo->mem, 0, sizeof(bo->mem));
797 bo->mem.mem_type = TTM_PL_SYSTEM;
798 bo->ttm = NULL;
799
800 dma_resv_unlock(&ghost->base._resv);
801 ttm_bo_put(ghost);
802
803 return 0;
804}