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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 struct ttm_operation_ctx *ctx,
49 struct ttm_mem_reg *new_mem)
50{
51 struct ttm_tt *ttm = bo->ttm;
52 struct ttm_mem_reg *old_mem = &bo->mem;
53 int ret;
54
55 if (old_mem->mem_type != TTM_PL_SYSTEM) {
56 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
57
58 if (unlikely(ret != 0)) {
59 if (ret != -ERESTARTSYS)
60 pr_err("Failed to expire sync object before unbinding TTM\n");
61 return ret;
62 }
63
64 ttm_tt_unbind(ttm);
65 ttm_bo_free_old_node(bo);
66 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
67 TTM_PL_MASK_MEM);
68 old_mem->mem_type = TTM_PL_SYSTEM;
69 }
70
71 ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
72 if (unlikely(ret != 0))
73 return ret;
74
75 if (new_mem->mem_type != TTM_PL_SYSTEM) {
76 ret = ttm_tt_bind(ttm, new_mem, ctx);
77 if (unlikely(ret != 0))
78 return ret;
79 }
80
81 *old_mem = *new_mem;
82 new_mem->mm_node = NULL;
83
84 return 0;
85}
86EXPORT_SYMBOL(ttm_bo_move_ttm);
87
88int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
89{
90 if (likely(man->io_reserve_fastpath))
91 return 0;
92
93 if (interruptible)
94 return mutex_lock_interruptible(&man->io_reserve_mutex);
95
96 mutex_lock(&man->io_reserve_mutex);
97 return 0;
98}
99EXPORT_SYMBOL(ttm_mem_io_lock);
100
101void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
102{
103 if (likely(man->io_reserve_fastpath))
104 return;
105
106 mutex_unlock(&man->io_reserve_mutex);
107}
108EXPORT_SYMBOL(ttm_mem_io_unlock);
109
110static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
111{
112 struct ttm_buffer_object *bo;
113
114 if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
115 return -EAGAIN;
116
117 bo = list_first_entry(&man->io_reserve_lru,
118 struct ttm_buffer_object,
119 io_reserve_lru);
120 list_del_init(&bo->io_reserve_lru);
121 ttm_bo_unmap_virtual_locked(bo);
122
123 return 0;
124}
125
126
127int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
128 struct ttm_mem_reg *mem)
129{
130 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
131 int ret = 0;
132
133 if (!bdev->driver->io_mem_reserve)
134 return 0;
135 if (likely(man->io_reserve_fastpath))
136 return bdev->driver->io_mem_reserve(bdev, mem);
137
138 if (bdev->driver->io_mem_reserve &&
139 mem->bus.io_reserved_count++ == 0) {
140retry:
141 ret = bdev->driver->io_mem_reserve(bdev, mem);
142 if (ret == -EAGAIN) {
143 ret = ttm_mem_io_evict(man);
144 if (ret == 0)
145 goto retry;
146 }
147 }
148 return ret;
149}
150EXPORT_SYMBOL(ttm_mem_io_reserve);
151
152void ttm_mem_io_free(struct ttm_bo_device *bdev,
153 struct ttm_mem_reg *mem)
154{
155 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
156
157 if (likely(man->io_reserve_fastpath))
158 return;
159
160 if (bdev->driver->io_mem_reserve &&
161 --mem->bus.io_reserved_count == 0 &&
162 bdev->driver->io_mem_free)
163 bdev->driver->io_mem_free(bdev, mem);
164
165}
166EXPORT_SYMBOL(ttm_mem_io_free);
167
168int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
169{
170 struct ttm_mem_reg *mem = &bo->mem;
171 int ret;
172
173 if (!mem->bus.io_reserved_vm) {
174 struct ttm_mem_type_manager *man =
175 &bo->bdev->man[mem->mem_type];
176
177 ret = ttm_mem_io_reserve(bo->bdev, mem);
178 if (unlikely(ret != 0))
179 return ret;
180 mem->bus.io_reserved_vm = true;
181 if (man->use_io_reserve_lru)
182 list_add_tail(&bo->io_reserve_lru,
183 &man->io_reserve_lru);
184 }
185 return 0;
186}
187
188void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
189{
190 struct ttm_mem_reg *mem = &bo->mem;
191
192 if (mem->bus.io_reserved_vm) {
193 mem->bus.io_reserved_vm = false;
194 list_del_init(&bo->io_reserve_lru);
195 ttm_mem_io_free(bo->bdev, mem);
196 }
197}
198
199static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
200 void **virtual)
201{
202 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
203 int ret;
204 void *addr;
205
206 *virtual = NULL;
207 (void) ttm_mem_io_lock(man, false);
208 ret = ttm_mem_io_reserve(bdev, mem);
209 ttm_mem_io_unlock(man);
210 if (ret || !mem->bus.is_iomem)
211 return ret;
212
213 if (mem->bus.addr) {
214 addr = mem->bus.addr;
215 } else {
216 if (mem->placement & TTM_PL_FLAG_WC)
217 addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
218 else
219 addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
220 if (!addr) {
221 (void) ttm_mem_io_lock(man, false);
222 ttm_mem_io_free(bdev, mem);
223 ttm_mem_io_unlock(man);
224 return -ENOMEM;
225 }
226 }
227 *virtual = addr;
228 return 0;
229}
230
231static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
232 void *virtual)
233{
234 struct ttm_mem_type_manager *man;
235
236 man = &bdev->man[mem->mem_type];
237
238 if (virtual && mem->bus.addr == NULL)
239 iounmap(virtual);
240 (void) ttm_mem_io_lock(man, false);
241 ttm_mem_io_free(bdev, mem);
242 ttm_mem_io_unlock(man);
243}
244
245static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
246{
247 uint32_t *dstP =
248 (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
249 uint32_t *srcP =
250 (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
251
252 int i;
253 for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
254 iowrite32(ioread32(srcP++), dstP++);
255 return 0;
256}
257
258#ifdef CONFIG_X86
259#define __ttm_kmap_atomic_prot(__page, __prot) kmap_atomic_prot(__page, __prot)
260#define __ttm_kunmap_atomic(__addr) kunmap_atomic(__addr)
261#else
262#define __ttm_kmap_atomic_prot(__page, __prot) vmap(&__page, 1, 0, __prot)
263#define __ttm_kunmap_atomic(__addr) vunmap(__addr)
264#endif
265
266
267/**
268 * ttm_kmap_atomic_prot - Efficient kernel map of a single page with
269 * specified page protection.
270 *
271 * @page: The page to map.
272 * @prot: The page protection.
273 *
274 * This function maps a TTM page using the kmap_atomic api if available,
275 * otherwise falls back to vmap. The user must make sure that the
276 * specified page does not have an aliased mapping with a different caching
277 * policy unless the architecture explicitly allows it. Also mapping and
278 * unmapping using this api must be correctly nested. Unmapping should
279 * occur in the reverse order of mapping.
280 */
281void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot)
282{
283 if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
284 return kmap_atomic(page);
285 else
286 return __ttm_kmap_atomic_prot(page, prot);
287}
288EXPORT_SYMBOL(ttm_kmap_atomic_prot);
289
290/**
291 * ttm_kunmap_atomic_prot - Unmap a page that was mapped using
292 * ttm_kmap_atomic_prot.
293 *
294 * @addr: The virtual address from the map.
295 * @prot: The page protection.
296 */
297void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot)
298{
299 if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
300 kunmap_atomic(addr);
301 else
302 __ttm_kunmap_atomic(addr);
303}
304EXPORT_SYMBOL(ttm_kunmap_atomic_prot);
305
306static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
307 unsigned long page,
308 pgprot_t prot)
309{
310 struct page *d = ttm->pages[page];
311 void *dst;
312
313 if (!d)
314 return -ENOMEM;
315
316 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
317 dst = ttm_kmap_atomic_prot(d, prot);
318 if (!dst)
319 return -ENOMEM;
320
321 memcpy_fromio(dst, src, PAGE_SIZE);
322
323 ttm_kunmap_atomic_prot(dst, prot);
324
325 return 0;
326}
327
328static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
329 unsigned long page,
330 pgprot_t prot)
331{
332 struct page *s = ttm->pages[page];
333 void *src;
334
335 if (!s)
336 return -ENOMEM;
337
338 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
339 src = ttm_kmap_atomic_prot(s, prot);
340 if (!src)
341 return -ENOMEM;
342
343 memcpy_toio(dst, src, PAGE_SIZE);
344
345 ttm_kunmap_atomic_prot(src, prot);
346
347 return 0;
348}
349
350int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
351 struct ttm_operation_ctx *ctx,
352 struct ttm_mem_reg *new_mem)
353{
354 struct ttm_bo_device *bdev = bo->bdev;
355 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
356 struct ttm_tt *ttm = bo->ttm;
357 struct ttm_mem_reg *old_mem = &bo->mem;
358 struct ttm_mem_reg old_copy = *old_mem;
359 void *old_iomap;
360 void *new_iomap;
361 int ret;
362 unsigned long i;
363 unsigned long page;
364 unsigned long add = 0;
365 int dir;
366
367 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
368 if (ret)
369 return ret;
370
371 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
372 if (ret)
373 return ret;
374 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
375 if (ret)
376 goto out;
377
378 /*
379 * Single TTM move. NOP.
380 */
381 if (old_iomap == NULL && new_iomap == NULL)
382 goto out2;
383
384 /*
385 * Don't move nonexistent data. Clear destination instead.
386 */
387 if (old_iomap == NULL &&
388 (ttm == NULL || (ttm->state == tt_unpopulated &&
389 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
390 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
391 goto out2;
392 }
393
394 /*
395 * TTM might be null for moves within the same region.
396 */
397 if (ttm) {
398 ret = ttm_tt_populate(ttm, ctx);
399 if (ret)
400 goto out1;
401 }
402
403 add = 0;
404 dir = 1;
405
406 if ((old_mem->mem_type == new_mem->mem_type) &&
407 (new_mem->start < old_mem->start + old_mem->size)) {
408 dir = -1;
409 add = new_mem->num_pages - 1;
410 }
411
412 for (i = 0; i < new_mem->num_pages; ++i) {
413 page = i * dir + add;
414 if (old_iomap == NULL) {
415 pgprot_t prot = ttm_io_prot(old_mem->placement,
416 PAGE_KERNEL);
417 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
418 prot);
419 } else if (new_iomap == NULL) {
420 pgprot_t prot = ttm_io_prot(new_mem->placement,
421 PAGE_KERNEL);
422 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
423 prot);
424 } else {
425 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
426 }
427 if (ret)
428 goto out1;
429 }
430 mb();
431out2:
432 old_copy = *old_mem;
433 *old_mem = *new_mem;
434 new_mem->mm_node = NULL;
435
436 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
437 ttm_tt_destroy(ttm);
438 bo->ttm = NULL;
439 }
440
441out1:
442 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
443out:
444 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
445
446 /*
447 * On error, keep the mm node!
448 */
449 if (!ret)
450 ttm_bo_mem_put(bo, &old_copy);
451 return ret;
452}
453EXPORT_SYMBOL(ttm_bo_move_memcpy);
454
455static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
456{
457 kfree(bo);
458}
459
460/**
461 * ttm_buffer_object_transfer
462 *
463 * @bo: A pointer to a struct ttm_buffer_object.
464 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
465 * holding the data of @bo with the old placement.
466 *
467 * This is a utility function that may be called after an accelerated move
468 * has been scheduled. A new buffer object is created as a placeholder for
469 * the old data while it's being copied. When that buffer object is idle,
470 * it can be destroyed, releasing the space of the old placement.
471 * Returns:
472 * !0: Failure.
473 */
474
475static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
476 struct ttm_buffer_object **new_obj)
477{
478 struct ttm_buffer_object *fbo;
479 int ret;
480
481 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
482 if (!fbo)
483 return -ENOMEM;
484
485 *fbo = *bo;
486
487 /**
488 * Fix up members that we shouldn't copy directly:
489 * TODO: Explicit member copy would probably be better here.
490 */
491
492 atomic_inc(&bo->bdev->glob->bo_count);
493 INIT_LIST_HEAD(&fbo->ddestroy);
494 INIT_LIST_HEAD(&fbo->lru);
495 INIT_LIST_HEAD(&fbo->swap);
496 INIT_LIST_HEAD(&fbo->io_reserve_lru);
497 mutex_init(&fbo->wu_mutex);
498 fbo->moving = NULL;
499 drm_vma_node_reset(&fbo->vma_node);
500 atomic_set(&fbo->cpu_writers, 0);
501
502 kref_init(&fbo->list_kref);
503 kref_init(&fbo->kref);
504 fbo->destroy = &ttm_transfered_destroy;
505 fbo->acc_size = 0;
506 fbo->resv = &fbo->ttm_resv;
507 reservation_object_init(fbo->resv);
508 ret = reservation_object_trylock(fbo->resv);
509 WARN_ON(!ret);
510
511 *new_obj = fbo;
512 return 0;
513}
514
515pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
516{
517 /* Cached mappings need no adjustment */
518 if (caching_flags & TTM_PL_FLAG_CACHED)
519 return tmp;
520
521#if defined(__i386__) || defined(__x86_64__)
522 if (caching_flags & TTM_PL_FLAG_WC)
523 tmp = pgprot_writecombine(tmp);
524 else if (boot_cpu_data.x86 > 3)
525 tmp = pgprot_noncached(tmp);
526#endif
527#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
528 defined(__powerpc__)
529 if (caching_flags & TTM_PL_FLAG_WC)
530 tmp = pgprot_writecombine(tmp);
531 else
532 tmp = pgprot_noncached(tmp);
533#endif
534#if defined(__sparc__) || defined(__mips__)
535 tmp = pgprot_noncached(tmp);
536#endif
537 return tmp;
538}
539EXPORT_SYMBOL(ttm_io_prot);
540
541static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
542 unsigned long offset,
543 unsigned long size,
544 struct ttm_bo_kmap_obj *map)
545{
546 struct ttm_mem_reg *mem = &bo->mem;
547
548 if (bo->mem.bus.addr) {
549 map->bo_kmap_type = ttm_bo_map_premapped;
550 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
551 } else {
552 map->bo_kmap_type = ttm_bo_map_iomap;
553 if (mem->placement & TTM_PL_FLAG_WC)
554 map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
555 size);
556 else
557 map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
558 size);
559 }
560 return (!map->virtual) ? -ENOMEM : 0;
561}
562
563static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
564 unsigned long start_page,
565 unsigned long num_pages,
566 struct ttm_bo_kmap_obj *map)
567{
568 struct ttm_mem_reg *mem = &bo->mem;
569 struct ttm_operation_ctx ctx = {
570 .interruptible = false,
571 .no_wait_gpu = false
572 };
573 struct ttm_tt *ttm = bo->ttm;
574 pgprot_t prot;
575 int ret;
576
577 BUG_ON(!ttm);
578
579 ret = ttm_tt_populate(ttm, &ctx);
580 if (ret)
581 return ret;
582
583 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
584 /*
585 * We're mapping a single page, and the desired
586 * page protection is consistent with the bo.
587 */
588
589 map->bo_kmap_type = ttm_bo_map_kmap;
590 map->page = ttm->pages[start_page];
591 map->virtual = kmap(map->page);
592 } else {
593 /*
594 * We need to use vmap to get the desired page protection
595 * or to make the buffer object look contiguous.
596 */
597 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
598 map->bo_kmap_type = ttm_bo_map_vmap;
599 map->virtual = vmap(ttm->pages + start_page, num_pages,
600 0, prot);
601 }
602 return (!map->virtual) ? -ENOMEM : 0;
603}
604
605int ttm_bo_kmap(struct ttm_buffer_object *bo,
606 unsigned long start_page, unsigned long num_pages,
607 struct ttm_bo_kmap_obj *map)
608{
609 struct ttm_mem_type_manager *man =
610 &bo->bdev->man[bo->mem.mem_type];
611 unsigned long offset, size;
612 int ret;
613
614 map->virtual = NULL;
615 map->bo = bo;
616 if (num_pages > bo->num_pages)
617 return -EINVAL;
618 if (start_page > bo->num_pages)
619 return -EINVAL;
620#if 0
621 if (num_pages > 1 && !capable(CAP_SYS_ADMIN))
622 return -EPERM;
623#endif
624 (void) ttm_mem_io_lock(man, false);
625 ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
626 ttm_mem_io_unlock(man);
627 if (ret)
628 return ret;
629 if (!bo->mem.bus.is_iomem) {
630 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
631 } else {
632 offset = start_page << PAGE_SHIFT;
633 size = num_pages << PAGE_SHIFT;
634 return ttm_bo_ioremap(bo, offset, size, map);
635 }
636}
637EXPORT_SYMBOL(ttm_bo_kmap);
638
639void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
640{
641 struct ttm_buffer_object *bo = map->bo;
642 struct ttm_mem_type_manager *man =
643 &bo->bdev->man[bo->mem.mem_type];
644
645 if (!map->virtual)
646 return;
647 switch (map->bo_kmap_type) {
648 case ttm_bo_map_iomap:
649 iounmap(map->virtual);
650 break;
651 case ttm_bo_map_vmap:
652 vunmap(map->virtual);
653 break;
654 case ttm_bo_map_kmap:
655 kunmap(map->page);
656 break;
657 case ttm_bo_map_premapped:
658 break;
659 default:
660 BUG();
661 }
662 (void) ttm_mem_io_lock(man, false);
663 ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
664 ttm_mem_io_unlock(man);
665 map->virtual = NULL;
666 map->page = NULL;
667}
668EXPORT_SYMBOL(ttm_bo_kunmap);
669
670int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
671 struct dma_fence *fence,
672 bool evict,
673 struct ttm_mem_reg *new_mem)
674{
675 struct ttm_bo_device *bdev = bo->bdev;
676 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
677 struct ttm_mem_reg *old_mem = &bo->mem;
678 int ret;
679 struct ttm_buffer_object *ghost_obj;
680
681 reservation_object_add_excl_fence(bo->resv, fence);
682 if (evict) {
683 ret = ttm_bo_wait(bo, false, false);
684 if (ret)
685 return ret;
686
687 if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
688 ttm_tt_destroy(bo->ttm);
689 bo->ttm = NULL;
690 }
691 ttm_bo_free_old_node(bo);
692 } else {
693 /**
694 * This should help pipeline ordinary buffer moves.
695 *
696 * Hang old buffer memory on a new buffer object,
697 * and leave it to be released when the GPU
698 * operation has completed.
699 */
700
701 dma_fence_put(bo->moving);
702 bo->moving = dma_fence_get(fence);
703
704 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
705 if (ret)
706 return ret;
707
708 reservation_object_add_excl_fence(ghost_obj->resv, fence);
709
710 /**
711 * If we're not moving to fixed memory, the TTM object
712 * needs to stay alive. Otherwhise hang it on the ghost
713 * bo to be unbound and destroyed.
714 */
715
716 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
717 ghost_obj->ttm = NULL;
718 else
719 bo->ttm = NULL;
720
721 ttm_bo_unreserve(ghost_obj);
722 ttm_bo_unref(&ghost_obj);
723 }
724
725 *old_mem = *new_mem;
726 new_mem->mm_node = NULL;
727
728 return 0;
729}
730EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
731
732int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
733 struct dma_fence *fence, bool evict,
734 struct ttm_mem_reg *new_mem)
735{
736 struct ttm_bo_device *bdev = bo->bdev;
737 struct ttm_mem_reg *old_mem = &bo->mem;
738
739 struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
740 struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
741
742 int ret;
743
744 reservation_object_add_excl_fence(bo->resv, fence);
745
746 if (!evict) {
747 struct ttm_buffer_object *ghost_obj;
748
749 /**
750 * This should help pipeline ordinary buffer moves.
751 *
752 * Hang old buffer memory on a new buffer object,
753 * and leave it to be released when the GPU
754 * operation has completed.
755 */
756
757 dma_fence_put(bo->moving);
758 bo->moving = dma_fence_get(fence);
759
760 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
761 if (ret)
762 return ret;
763
764 reservation_object_add_excl_fence(ghost_obj->resv, fence);
765
766 /**
767 * If we're not moving to fixed memory, the TTM object
768 * needs to stay alive. Otherwhise hang it on the ghost
769 * bo to be unbound and destroyed.
770 */
771
772 if (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
773 ghost_obj->ttm = NULL;
774 else
775 bo->ttm = NULL;
776
777 ttm_bo_unreserve(ghost_obj);
778 ttm_bo_unref(&ghost_obj);
779
780 } else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
781
782 /**
783 * BO doesn't have a TTM we need to bind/unbind. Just remember
784 * this eviction and free up the allocation
785 */
786
787 spin_lock(&from->move_lock);
788 if (!from->move || dma_fence_is_later(fence, from->move)) {
789 dma_fence_put(from->move);
790 from->move = dma_fence_get(fence);
791 }
792 spin_unlock(&from->move_lock);
793
794 ttm_bo_free_old_node(bo);
795
796 dma_fence_put(bo->moving);
797 bo->moving = dma_fence_get(fence);
798
799 } else {
800 /**
801 * Last resort, wait for the move to be completed.
802 *
803 * Should never happen in pratice.
804 */
805
806 ret = ttm_bo_wait(bo, false, false);
807 if (ret)
808 return ret;
809
810 if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
811 ttm_tt_destroy(bo->ttm);
812 bo->ttm = NULL;
813 }
814 ttm_bo_free_old_node(bo);
815 }
816
817 *old_mem = *new_mem;
818 new_mem->mm_node = NULL;
819
820 return 0;
821}
822EXPORT_SYMBOL(ttm_bo_pipeline_move);
823
824int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
825{
826 struct ttm_buffer_object *ghost;
827 int ret;
828
829 ret = ttm_buffer_object_transfer(bo, &ghost);
830 if (ret)
831 return ret;
832
833 ret = reservation_object_copy_fences(ghost->resv, bo->resv);
834 /* Last resort, wait for the BO to be idle when we are OOM */
835 if (ret)
836 ttm_bo_wait(bo, false, false);
837
838 memset(&bo->mem, 0, sizeof(bo->mem));
839 bo->mem.mem_type = TTM_PL_SYSTEM;
840 bo->ttm = NULL;
841
842 ttm_bo_unreserve(ghost);
843 ttm_bo_unref(&ghost);
844
845 return 0;
846}
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
41void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
42{
43 ttm_bo_mem_put(bo, &bo->mem);
44}
45
46int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
47 bool evict,
48 bool no_wait_gpu, struct ttm_mem_reg *new_mem)
49{
50 struct ttm_tt *ttm = bo->ttm;
51 struct ttm_mem_reg *old_mem = &bo->mem;
52 int ret;
53
54 if (old_mem->mem_type != TTM_PL_SYSTEM) {
55 ttm_tt_unbind(ttm);
56 ttm_bo_free_old_node(bo);
57 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
58 TTM_PL_MASK_MEM);
59 old_mem->mem_type = TTM_PL_SYSTEM;
60 }
61
62 ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
63 if (unlikely(ret != 0))
64 return ret;
65
66 if (new_mem->mem_type != TTM_PL_SYSTEM) {
67 ret = ttm_tt_bind(ttm, new_mem);
68 if (unlikely(ret != 0))
69 return ret;
70 }
71
72 *old_mem = *new_mem;
73 new_mem->mm_node = NULL;
74
75 return 0;
76}
77EXPORT_SYMBOL(ttm_bo_move_ttm);
78
79int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
80{
81 if (likely(man->io_reserve_fastpath))
82 return 0;
83
84 if (interruptible)
85 return mutex_lock_interruptible(&man->io_reserve_mutex);
86
87 mutex_lock(&man->io_reserve_mutex);
88 return 0;
89}
90EXPORT_SYMBOL(ttm_mem_io_lock);
91
92void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
93{
94 if (likely(man->io_reserve_fastpath))
95 return;
96
97 mutex_unlock(&man->io_reserve_mutex);
98}
99EXPORT_SYMBOL(ttm_mem_io_unlock);
100
101static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
102{
103 struct ttm_buffer_object *bo;
104
105 if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))
106 return -EAGAIN;
107
108 bo = list_first_entry(&man->io_reserve_lru,
109 struct ttm_buffer_object,
110 io_reserve_lru);
111 list_del_init(&bo->io_reserve_lru);
112 ttm_bo_unmap_virtual_locked(bo);
113
114 return 0;
115}
116
117
118int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
119 struct ttm_mem_reg *mem)
120{
121 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
122 int ret = 0;
123
124 if (!bdev->driver->io_mem_reserve)
125 return 0;
126 if (likely(man->io_reserve_fastpath))
127 return bdev->driver->io_mem_reserve(bdev, mem);
128
129 if (bdev->driver->io_mem_reserve &&
130 mem->bus.io_reserved_count++ == 0) {
131retry:
132 ret = bdev->driver->io_mem_reserve(bdev, mem);
133 if (ret == -EAGAIN) {
134 ret = ttm_mem_io_evict(man);
135 if (ret == 0)
136 goto retry;
137 }
138 }
139 return ret;
140}
141EXPORT_SYMBOL(ttm_mem_io_reserve);
142
143void ttm_mem_io_free(struct ttm_bo_device *bdev,
144 struct ttm_mem_reg *mem)
145{
146 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
147
148 if (likely(man->io_reserve_fastpath))
149 return;
150
151 if (bdev->driver->io_mem_reserve &&
152 --mem->bus.io_reserved_count == 0 &&
153 bdev->driver->io_mem_free)
154 bdev->driver->io_mem_free(bdev, mem);
155
156}
157EXPORT_SYMBOL(ttm_mem_io_free);
158
159int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
160{
161 struct ttm_mem_reg *mem = &bo->mem;
162 int ret;
163
164 if (!mem->bus.io_reserved_vm) {
165 struct ttm_mem_type_manager *man =
166 &bo->bdev->man[mem->mem_type];
167
168 ret = ttm_mem_io_reserve(bo->bdev, mem);
169 if (unlikely(ret != 0))
170 return ret;
171 mem->bus.io_reserved_vm = true;
172 if (man->use_io_reserve_lru)
173 list_add_tail(&bo->io_reserve_lru,
174 &man->io_reserve_lru);
175 }
176 return 0;
177}
178
179void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
180{
181 struct ttm_mem_reg *mem = &bo->mem;
182
183 if (mem->bus.io_reserved_vm) {
184 mem->bus.io_reserved_vm = false;
185 list_del_init(&bo->io_reserve_lru);
186 ttm_mem_io_free(bo->bdev, mem);
187 }
188}
189
190static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
191 void **virtual)
192{
193 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
194 int ret;
195 void *addr;
196
197 *virtual = NULL;
198 (void) ttm_mem_io_lock(man, false);
199 ret = ttm_mem_io_reserve(bdev, mem);
200 ttm_mem_io_unlock(man);
201 if (ret || !mem->bus.is_iomem)
202 return ret;
203
204 if (mem->bus.addr) {
205 addr = mem->bus.addr;
206 } else {
207 if (mem->placement & TTM_PL_FLAG_WC)
208 addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
209 else
210 addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
211 if (!addr) {
212 (void) ttm_mem_io_lock(man, false);
213 ttm_mem_io_free(bdev, mem);
214 ttm_mem_io_unlock(man);
215 return -ENOMEM;
216 }
217 }
218 *virtual = addr;
219 return 0;
220}
221
222static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,
223 void *virtual)
224{
225 struct ttm_mem_type_manager *man;
226
227 man = &bdev->man[mem->mem_type];
228
229 if (virtual && mem->bus.addr == NULL)
230 iounmap(virtual);
231 (void) ttm_mem_io_lock(man, false);
232 ttm_mem_io_free(bdev, mem);
233 ttm_mem_io_unlock(man);
234}
235
236static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
237{
238 uint32_t *dstP =
239 (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
240 uint32_t *srcP =
241 (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
242
243 int i;
244 for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
245 iowrite32(ioread32(srcP++), dstP++);
246 return 0;
247}
248
249static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
250 unsigned long page,
251 pgprot_t prot)
252{
253 struct page *d = ttm->pages[page];
254 void *dst;
255
256 if (!d)
257 return -ENOMEM;
258
259 src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
260
261#ifdef CONFIG_X86
262 dst = kmap_atomic_prot(d, prot);
263#else
264 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
265 dst = vmap(&d, 1, 0, prot);
266 else
267 dst = kmap(d);
268#endif
269 if (!dst)
270 return -ENOMEM;
271
272 memcpy_fromio(dst, src, PAGE_SIZE);
273
274#ifdef CONFIG_X86
275 kunmap_atomic(dst);
276#else
277 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
278 vunmap(dst);
279 else
280 kunmap(d);
281#endif
282
283 return 0;
284}
285
286static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
287 unsigned long page,
288 pgprot_t prot)
289{
290 struct page *s = ttm->pages[page];
291 void *src;
292
293 if (!s)
294 return -ENOMEM;
295
296 dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
297#ifdef CONFIG_X86
298 src = kmap_atomic_prot(s, prot);
299#else
300 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
301 src = vmap(&s, 1, 0, prot);
302 else
303 src = kmap(s);
304#endif
305 if (!src)
306 return -ENOMEM;
307
308 memcpy_toio(dst, src, PAGE_SIZE);
309
310#ifdef CONFIG_X86
311 kunmap_atomic(src);
312#else
313 if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
314 vunmap(src);
315 else
316 kunmap(s);
317#endif
318
319 return 0;
320}
321
322int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
323 bool evict, bool no_wait_gpu,
324 struct ttm_mem_reg *new_mem)
325{
326 struct ttm_bo_device *bdev = bo->bdev;
327 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
328 struct ttm_tt *ttm = bo->ttm;
329 struct ttm_mem_reg *old_mem = &bo->mem;
330 struct ttm_mem_reg old_copy = *old_mem;
331 void *old_iomap;
332 void *new_iomap;
333 int ret;
334 unsigned long i;
335 unsigned long page;
336 unsigned long add = 0;
337 int dir;
338
339 ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
340 if (ret)
341 return ret;
342 ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
343 if (ret)
344 goto out;
345
346 /*
347 * Single TTM move. NOP.
348 */
349 if (old_iomap == NULL && new_iomap == NULL)
350 goto out2;
351
352 /*
353 * Don't move nonexistent data. Clear destination instead.
354 */
355 if (old_iomap == NULL &&
356 (ttm == NULL || (ttm->state == tt_unpopulated &&
357 !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
358 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
359 goto out2;
360 }
361
362 /*
363 * TTM might be null for moves within the same region.
364 */
365 if (ttm && ttm->state == tt_unpopulated) {
366 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
367 if (ret)
368 goto out1;
369 }
370
371 add = 0;
372 dir = 1;
373
374 if ((old_mem->mem_type == new_mem->mem_type) &&
375 (new_mem->start < old_mem->start + old_mem->size)) {
376 dir = -1;
377 add = new_mem->num_pages - 1;
378 }
379
380 for (i = 0; i < new_mem->num_pages; ++i) {
381 page = i * dir + add;
382 if (old_iomap == NULL) {
383 pgprot_t prot = ttm_io_prot(old_mem->placement,
384 PAGE_KERNEL);
385 ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
386 prot);
387 } else if (new_iomap == NULL) {
388 pgprot_t prot = ttm_io_prot(new_mem->placement,
389 PAGE_KERNEL);
390 ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
391 prot);
392 } else
393 ret = ttm_copy_io_page(new_iomap, old_iomap, page);
394 if (ret)
395 goto out1;
396 }
397 mb();
398out2:
399 old_copy = *old_mem;
400 *old_mem = *new_mem;
401 new_mem->mm_node = NULL;
402
403 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
404 ttm_tt_unbind(ttm);
405 ttm_tt_destroy(ttm);
406 bo->ttm = NULL;
407 }
408
409out1:
410 ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
411out:
412 ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
413
414 /*
415 * On error, keep the mm node!
416 */
417 if (!ret)
418 ttm_bo_mem_put(bo, &old_copy);
419 return ret;
420}
421EXPORT_SYMBOL(ttm_bo_move_memcpy);
422
423static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
424{
425 kfree(bo);
426}
427
428/**
429 * ttm_buffer_object_transfer
430 *
431 * @bo: A pointer to a struct ttm_buffer_object.
432 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
433 * holding the data of @bo with the old placement.
434 *
435 * This is a utility function that may be called after an accelerated move
436 * has been scheduled. A new buffer object is created as a placeholder for
437 * the old data while it's being copied. When that buffer object is idle,
438 * it can be destroyed, releasing the space of the old placement.
439 * Returns:
440 * !0: Failure.
441 */
442
443static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
444 struct ttm_buffer_object **new_obj)
445{
446 struct ttm_buffer_object *fbo;
447 struct ttm_bo_device *bdev = bo->bdev;
448 struct ttm_bo_driver *driver = bdev->driver;
449 int ret;
450
451 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
452 if (!fbo)
453 return -ENOMEM;
454
455 *fbo = *bo;
456
457 /**
458 * Fix up members that we shouldn't copy directly:
459 * TODO: Explicit member copy would probably be better here.
460 */
461
462 INIT_LIST_HEAD(&fbo->ddestroy);
463 INIT_LIST_HEAD(&fbo->lru);
464 INIT_LIST_HEAD(&fbo->swap);
465 INIT_LIST_HEAD(&fbo->io_reserve_lru);
466 drm_vma_node_reset(&fbo->vma_node);
467 atomic_set(&fbo->cpu_writers, 0);
468
469 spin_lock(&bdev->fence_lock);
470 if (bo->sync_obj)
471 fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
472 else
473 fbo->sync_obj = NULL;
474 spin_unlock(&bdev->fence_lock);
475 kref_init(&fbo->list_kref);
476 kref_init(&fbo->kref);
477 fbo->destroy = &ttm_transfered_destroy;
478 fbo->acc_size = 0;
479 fbo->resv = &fbo->ttm_resv;
480 reservation_object_init(fbo->resv);
481 ret = ww_mutex_trylock(&fbo->resv->lock);
482 WARN_ON(!ret);
483
484 *new_obj = fbo;
485 return 0;
486}
487
488pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
489{
490#if defined(__i386__) || defined(__x86_64__)
491 if (caching_flags & TTM_PL_FLAG_WC)
492 tmp = pgprot_writecombine(tmp);
493 else if (boot_cpu_data.x86 > 3)
494 tmp = pgprot_noncached(tmp);
495
496#elif defined(__powerpc__)
497 if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
498 pgprot_val(tmp) |= _PAGE_NO_CACHE;
499 if (caching_flags & TTM_PL_FLAG_UNCACHED)
500 pgprot_val(tmp) |= _PAGE_GUARDED;
501 }
502#endif
503#if defined(__ia64__)
504 if (caching_flags & TTM_PL_FLAG_WC)
505 tmp = pgprot_writecombine(tmp);
506 else
507 tmp = pgprot_noncached(tmp);
508#endif
509#if defined(__sparc__) || defined(__mips__)
510 if (!(caching_flags & TTM_PL_FLAG_CACHED))
511 tmp = pgprot_noncached(tmp);
512#endif
513 return tmp;
514}
515EXPORT_SYMBOL(ttm_io_prot);
516
517static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
518 unsigned long offset,
519 unsigned long size,
520 struct ttm_bo_kmap_obj *map)
521{
522 struct ttm_mem_reg *mem = &bo->mem;
523
524 if (bo->mem.bus.addr) {
525 map->bo_kmap_type = ttm_bo_map_premapped;
526 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
527 } else {
528 map->bo_kmap_type = ttm_bo_map_iomap;
529 if (mem->placement & TTM_PL_FLAG_WC)
530 map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
531 size);
532 else
533 map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
534 size);
535 }
536 return (!map->virtual) ? -ENOMEM : 0;
537}
538
539static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
540 unsigned long start_page,
541 unsigned long num_pages,
542 struct ttm_bo_kmap_obj *map)
543{
544 struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
545 struct ttm_tt *ttm = bo->ttm;
546 int ret;
547
548 BUG_ON(!ttm);
549
550 if (ttm->state == tt_unpopulated) {
551 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
552 if (ret)
553 return ret;
554 }
555
556 if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
557 /*
558 * We're mapping a single page, and the desired
559 * page protection is consistent with the bo.
560 */
561
562 map->bo_kmap_type = ttm_bo_map_kmap;
563 map->page = ttm->pages[start_page];
564 map->virtual = kmap(map->page);
565 } else {
566 /*
567 * We need to use vmap to get the desired page protection
568 * or to make the buffer object look contiguous.
569 */
570 prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
571 PAGE_KERNEL :
572 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 void *sync_obj,
648 bool evict,
649 bool no_wait_gpu,
650 struct ttm_mem_reg *new_mem)
651{
652 struct ttm_bo_device *bdev = bo->bdev;
653 struct ttm_bo_driver *driver = bdev->driver;
654 struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
655 struct ttm_mem_reg *old_mem = &bo->mem;
656 int ret;
657 struct ttm_buffer_object *ghost_obj;
658 void *tmp_obj = NULL;
659
660 spin_lock(&bdev->fence_lock);
661 if (bo->sync_obj) {
662 tmp_obj = bo->sync_obj;
663 bo->sync_obj = NULL;
664 }
665 bo->sync_obj = driver->sync_obj_ref(sync_obj);
666 if (evict) {
667 ret = ttm_bo_wait(bo, false, false, false);
668 spin_unlock(&bdev->fence_lock);
669 if (tmp_obj)
670 driver->sync_obj_unref(&tmp_obj);
671 if (ret)
672 return ret;
673
674 if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
675 (bo->ttm != NULL)) {
676 ttm_tt_unbind(bo->ttm);
677 ttm_tt_destroy(bo->ttm);
678 bo->ttm = NULL;
679 }
680 ttm_bo_free_old_node(bo);
681 } else {
682 /**
683 * This should help pipeline ordinary buffer moves.
684 *
685 * Hang old buffer memory on a new buffer object,
686 * and leave it to be released when the GPU
687 * operation has completed.
688 */
689
690 set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
691 spin_unlock(&bdev->fence_lock);
692 if (tmp_obj)
693 driver->sync_obj_unref(&tmp_obj);
694
695 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
696 if (ret)
697 return ret;
698
699 /**
700 * If we're not moving to fixed memory, the TTM object
701 * needs to stay alive. Otherwhise hang it on the ghost
702 * bo to be unbound and destroyed.
703 */
704
705 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
706 ghost_obj->ttm = NULL;
707 else
708 bo->ttm = NULL;
709
710 ttm_bo_unreserve(ghost_obj);
711 ttm_bo_unref(&ghost_obj);
712 }
713
714 *old_mem = *new_mem;
715 new_mem->mm_node = NULL;
716
717 return 0;
718}
719EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);