1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 #include <linux/vmalloc.h>
32 #include <linux/sched.h>
33 #include <linux/highmem.h>
34 #include <linux/pagemap.h>
35 #include <linux/file.h>
36 #include <linux/swap.h>
37 #include "ttm/ttm_module.h"
38 #include "ttm/ttm_bo_driver.h"
39 #include "ttm/ttm_placement.h"
41 static int ttm_tt_swapin(struct ttm_tt *ttm);
43 #if defined(CONFIG_X86)
44 static void ttm_tt_clflush_page(struct page *page)
46 uint8_t *page_virtual;
49 if (unlikely(page == NULL))
52 page_virtual = kmap_atomic(page, KM_USER0);
54 for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
55 clflush(page_virtual + i);
57 kunmap_atomic(page_virtual, KM_USER0);
60 static void ttm_tt_cache_flush_clflush(struct page *pages[],
61 unsigned long num_pages)
66 for (i = 0; i < num_pages; ++i)
67 ttm_tt_clflush_page(*pages++);
70 #elif !defined(__powerpc__)
71 static void ttm_tt_ipi_handler(void *null)
77 void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages)
80 #if defined(CONFIG_X86)
81 if (cpu_has_clflush) {
82 ttm_tt_cache_flush_clflush(pages, num_pages);
85 #elif defined(__powerpc__)
88 for (i = 0; i < num_pages; ++i) {
89 struct page *page = pages[i];
92 if (unlikely(page == NULL))
95 page_virtual = kmap_atomic(page, KM_USER0);
96 flush_dcache_range((unsigned long) page_virtual,
97 (unsigned long) page_virtual + PAGE_SIZE);
98 kunmap_atomic(page_virtual, KM_USER0);
101 if (on_each_cpu(ttm_tt_ipi_handler, NULL, 1) != 0)
102 printk(KERN_ERR TTM_PFX
103 "Timed out waiting for drm cache flush.\n");
108 * Allocates storage for pointers to the pages that back the ttm.
110 * Uses kmalloc if possible. Otherwise falls back to vmalloc.
112 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
114 unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
117 if (size <= PAGE_SIZE)
118 ttm->pages = kzalloc(size, GFP_KERNEL);
121 ttm->pages = vmalloc_user(size);
123 ttm->page_flags |= TTM_PAGE_FLAG_VMALLOC;
127 static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
129 if (ttm->page_flags & TTM_PAGE_FLAG_VMALLOC) {
131 ttm->page_flags &= ~TTM_PAGE_FLAG_VMALLOC;
138 static struct page *ttm_tt_alloc_page(unsigned page_flags)
140 gfp_t gfp_flags = GFP_HIGHUSER;
142 if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC)
143 gfp_flags |= __GFP_ZERO;
145 if (page_flags & TTM_PAGE_FLAG_DMA32)
146 gfp_flags |= __GFP_DMA32;
148 return alloc_page(gfp_flags);
151 static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
157 struct ttm_backend *be = ttm->be;
159 BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
160 write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
161 dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
166 for (i = 0; i < ttm->num_pages; ++i) {
167 page = ttm->pages[i];
171 if (page == ttm->dummy_read_page) {
176 if (write && dirty && !PageReserved(page))
177 set_page_dirty_lock(page);
179 ttm->pages[i] = NULL;
180 ttm_mem_global_free(ttm->bdev->mem_glob, PAGE_SIZE, false);
183 ttm->state = tt_unpopulated;
184 ttm->first_himem_page = ttm->num_pages;
185 ttm->last_lomem_page = -1;
188 static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
191 struct ttm_bo_device *bdev = ttm->bdev;
192 struct ttm_mem_global *mem_glob = bdev->mem_glob;
195 while (NULL == (p = ttm->pages[index])) {
196 p = ttm_tt_alloc_page(ttm->page_flags);
201 if (PageHighMem(p)) {
203 ttm_mem_global_alloc(mem_glob, PAGE_SIZE,
205 if (unlikely(ret != 0))
207 ttm->pages[--ttm->first_himem_page] = p;
210 ttm_mem_global_alloc(mem_glob, PAGE_SIZE,
211 false, false, false);
212 if (unlikely(ret != 0))
214 ttm->pages[++ttm->last_lomem_page] = p;
223 struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index)
227 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
228 ret = ttm_tt_swapin(ttm);
229 if (unlikely(ret != 0))
232 return __ttm_tt_get_page(ttm, index);
235 int ttm_tt_populate(struct ttm_tt *ttm)
239 struct ttm_backend *be;
242 if (ttm->state != tt_unpopulated)
245 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
246 ret = ttm_tt_swapin(ttm);
247 if (unlikely(ret != 0))
253 for (i = 0; i < ttm->num_pages; ++i) {
254 page = __ttm_tt_get_page(ttm, i);
259 be->func->populate(be, ttm->num_pages, ttm->pages,
260 ttm->dummy_read_page);
261 ttm->state = tt_unbound;
266 static inline int ttm_tt_set_page_caching(struct page *p,
267 enum ttm_caching_state c_state)
274 return set_pages_wb(p, 1);
276 return set_memory_wc((unsigned long) page_address(p), 1);
278 return set_pages_uc(p, 1);
281 #else /* CONFIG_X86 */
282 static inline int ttm_tt_set_page_caching(struct page *p,
283 enum ttm_caching_state c_state)
287 #endif /* CONFIG_X86 */
290 * Change caching policy for the linear kernel map
291 * for range of pages in a ttm.
294 static int ttm_tt_set_caching(struct ttm_tt *ttm,
295 enum ttm_caching_state c_state)
298 struct page *cur_page;
301 if (ttm->caching_state == c_state)
304 if (c_state != tt_cached) {
305 ret = ttm_tt_populate(ttm);
306 if (unlikely(ret != 0))
310 if (ttm->caching_state == tt_cached)
311 ttm_tt_cache_flush(ttm->pages, ttm->num_pages);
313 for (i = 0; i < ttm->num_pages; ++i) {
314 cur_page = ttm->pages[i];
315 if (likely(cur_page != NULL)) {
316 ret = ttm_tt_set_page_caching(cur_page, c_state);
317 if (unlikely(ret != 0))
322 ttm->caching_state = c_state;
327 for (j = 0; j < i; ++j) {
328 cur_page = ttm->pages[j];
329 if (likely(cur_page != NULL)) {
330 (void)ttm_tt_set_page_caching(cur_page,
338 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
340 enum ttm_caching_state state;
342 if (placement & TTM_PL_FLAG_WC)
344 else if (placement & TTM_PL_FLAG_UNCACHED)
349 return ttm_tt_set_caching(ttm, state);
352 static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
355 struct page *cur_page;
356 struct ttm_backend *be = ttm->be;
360 (void)ttm_tt_set_caching(ttm, tt_cached);
361 for (i = 0; i < ttm->num_pages; ++i) {
362 cur_page = ttm->pages[i];
363 ttm->pages[i] = NULL;
365 if (page_count(cur_page) != 1)
366 printk(KERN_ERR TTM_PFX
367 "Erroneous page count. "
369 ttm_mem_global_free(ttm->bdev->mem_glob, PAGE_SIZE,
370 PageHighMem(cur_page));
371 __free_page(cur_page);
374 ttm->state = tt_unpopulated;
375 ttm->first_himem_page = ttm->num_pages;
376 ttm->last_lomem_page = -1;
379 void ttm_tt_destroy(struct ttm_tt *ttm)
381 struct ttm_backend *be;
383 if (unlikely(ttm == NULL))
387 if (likely(be != NULL)) {
388 be->func->destroy(be);
392 if (likely(ttm->pages != NULL)) {
393 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
394 ttm_tt_free_user_pages(ttm);
396 ttm_tt_free_alloced_pages(ttm);
398 ttm_tt_free_page_directory(ttm);
401 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
403 fput(ttm->swap_storage);
408 int ttm_tt_set_user(struct ttm_tt *ttm,
409 struct task_struct *tsk,
410 unsigned long start, unsigned long num_pages)
412 struct mm_struct *mm = tsk->mm;
414 int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
415 struct ttm_mem_global *mem_glob = ttm->bdev->mem_glob;
417 BUG_ON(num_pages != ttm->num_pages);
418 BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
421 * Account user pages as lowmem pages for now.
424 ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
425 false, false, false);
426 if (unlikely(ret != 0))
429 down_read(&mm->mmap_sem);
430 ret = get_user_pages(tsk, mm, start, num_pages,
431 write, 0, ttm->pages, NULL);
432 up_read(&mm->mmap_sem);
434 if (ret != num_pages && write) {
435 ttm_tt_free_user_pages(ttm);
436 ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE, false);
442 ttm->state = tt_unbound;
447 struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
448 uint32_t page_flags, struct page *dummy_read_page)
450 struct ttm_bo_driver *bo_driver = bdev->driver;
456 ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
462 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
463 ttm->first_himem_page = ttm->num_pages;
464 ttm->last_lomem_page = -1;
465 ttm->caching_state = tt_cached;
466 ttm->page_flags = page_flags;
468 ttm->dummy_read_page = dummy_read_page;
470 ttm_tt_alloc_page_directory(ttm);
473 printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
476 ttm->be = bo_driver->create_ttm_backend_entry(bdev);
479 printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
482 ttm->state = tt_unpopulated;
486 void ttm_tt_unbind(struct ttm_tt *ttm)
489 struct ttm_backend *be = ttm->be;
491 if (ttm->state == tt_bound) {
492 ret = be->func->unbind(be);
494 ttm->state = tt_unbound;
498 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
501 struct ttm_backend *be;
506 if (ttm->state == tt_bound)
511 ret = ttm_tt_populate(ttm);
515 ret = be->func->bind(be, bo_mem);
517 printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n");
521 ttm->state = tt_bound;
523 if (ttm->page_flags & TTM_PAGE_FLAG_USER)
524 ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
527 EXPORT_SYMBOL(ttm_tt_bind);
529 static int ttm_tt_swapin(struct ttm_tt *ttm)
531 struct address_space *swap_space;
532 struct file *swap_storage;
533 struct page *from_page;
534 struct page *to_page;
540 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
541 ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
543 if (unlikely(ret != 0))
546 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
550 swap_storage = ttm->swap_storage;
551 BUG_ON(swap_storage == NULL);
553 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
555 for (i = 0; i < ttm->num_pages; ++i) {
556 from_page = read_mapping_page(swap_space, i, NULL);
557 if (IS_ERR(from_page))
559 to_page = __ttm_tt_get_page(ttm, i);
560 if (unlikely(to_page == NULL))
564 from_virtual = kmap_atomic(from_page, KM_USER0);
565 to_virtual = kmap_atomic(to_page, KM_USER1);
566 memcpy(to_virtual, from_virtual, PAGE_SIZE);
567 kunmap_atomic(to_virtual, KM_USER1);
568 kunmap_atomic(from_virtual, KM_USER0);
570 page_cache_release(from_page);
573 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
575 ttm->swap_storage = NULL;
576 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
580 ttm_tt_free_alloced_pages(ttm);
584 int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
586 struct address_space *swap_space;
587 struct file *swap_storage;
588 struct page *from_page;
589 struct page *to_page;
594 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
595 BUG_ON(ttm->caching_state != tt_cached);
598 * For user buffers, just unpin the pages, as there should be
602 if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
603 ttm_tt_free_user_pages(ttm);
604 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
605 ttm->swap_storage = NULL;
609 if (!persistant_swap_storage) {
610 swap_storage = shmem_file_setup("ttm swap",
611 ttm->num_pages << PAGE_SHIFT,
613 if (unlikely(IS_ERR(swap_storage))) {
614 printk(KERN_ERR "Failed allocating swap storage.\n");
618 swap_storage = persistant_swap_storage;
620 swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
622 for (i = 0; i < ttm->num_pages; ++i) {
623 from_page = ttm->pages[i];
624 if (unlikely(from_page == NULL))
626 to_page = read_mapping_page(swap_space, i, NULL);
627 if (unlikely(to_page == NULL))
631 from_virtual = kmap_atomic(from_page, KM_USER0);
632 to_virtual = kmap_atomic(to_page, KM_USER1);
633 memcpy(to_virtual, from_virtual, PAGE_SIZE);
634 kunmap_atomic(to_virtual, KM_USER1);
635 kunmap_atomic(from_virtual, KM_USER0);
637 set_page_dirty(to_page);
638 mark_page_accessed(to_page);
639 page_cache_release(to_page);
642 ttm_tt_free_alloced_pages(ttm);
643 ttm->swap_storage = swap_storage;
644 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
645 if (persistant_swap_storage)
646 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP;
650 if (!persistant_swap_storage)