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- /**************************************************************************
- *
- * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
- /*
- * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
- */
- #define pr_fmt(fmt) "[TTM] " fmt
- #include <linux/sched.h>
- #include <linux/highmem.h>
- #include <linux/pagemap.h>
- #include <linux/shmem_fs.h>
- #include <linux/file.h>
- #include <linux/swap.h>
- #include <linux/slab.h>
- #include <linux/export.h>
- #include <drm/drm_cache.h>
- #include <drm/drm_mem_util.h>
- #include <drm/ttm/ttm_module.h>
- #include <drm/ttm/ttm_bo_driver.h>
- #include <drm/ttm/ttm_placement.h>
- #include <drm/ttm/ttm_page_alloc.h>
- /**
- * Allocates storage for pointers to the pages that back the ttm.
- */
- static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
- {
- ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
- }
- static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
- {
- ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages,
- sizeof(*ttm->ttm.pages) +
- sizeof(*ttm->dma_address) +
- sizeof(*ttm->cpu_address));
- ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
- ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages);
- }
- #ifdef CONFIG_X86
- static inline int ttm_tt_set_page_caching(struct page *p,
- enum ttm_caching_state c_old,
- enum ttm_caching_state c_new)
- {
- int ret = 0;
- if (PageHighMem(p))
- return 0;
- if (c_old != tt_cached) {
- /* p isn't in the default caching state, set it to
- * writeback first to free its current memtype. */
- ret = set_pages_wb(p, 1);
- if (ret)
- return ret;
- }
- if (c_new == tt_wc)
- ret = set_memory_wc((unsigned long) page_address(p), 1);
- else if (c_new == tt_uncached)
- ret = set_pages_uc(p, 1);
- return ret;
- }
- #else /* CONFIG_X86 */
- static inline int ttm_tt_set_page_caching(struct page *p,
- enum ttm_caching_state c_old,
- enum ttm_caching_state c_new)
- {
- return 0;
- }
- #endif /* CONFIG_X86 */
- /*
- * Change caching policy for the linear kernel map
- * for range of pages in a ttm.
- */
- static int ttm_tt_set_caching(struct ttm_tt *ttm,
- enum ttm_caching_state c_state)
- {
- int i, j;
- struct page *cur_page;
- int ret;
- if (ttm->caching_state == c_state)
- return 0;
- if (ttm->state == tt_unpopulated) {
- /* Change caching but don't populate */
- ttm->caching_state = c_state;
- return 0;
- }
- if (ttm->caching_state == tt_cached)
- drm_clflush_pages(ttm->pages, ttm->num_pages);
- for (i = 0; i < ttm->num_pages; ++i) {
- cur_page = ttm->pages[i];
- if (likely(cur_page != NULL)) {
- ret = ttm_tt_set_page_caching(cur_page,
- ttm->caching_state,
- c_state);
- if (unlikely(ret != 0))
- goto out_err;
- }
- }
- ttm->caching_state = c_state;
- return 0;
- out_err:
- for (j = 0; j < i; ++j) {
- cur_page = ttm->pages[j];
- if (likely(cur_page != NULL)) {
- (void)ttm_tt_set_page_caching(cur_page, c_state,
- ttm->caching_state);
- }
- }
- return ret;
- }
- int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
- {
- enum ttm_caching_state state;
- if (placement & TTM_PL_FLAG_WC)
- state = tt_wc;
- else if (placement & TTM_PL_FLAG_UNCACHED)
- state = tt_uncached;
- else
- state = tt_cached;
- return ttm_tt_set_caching(ttm, state);
- }
- EXPORT_SYMBOL(ttm_tt_set_placement_caching);
- void ttm_tt_destroy(struct ttm_tt *ttm)
- {
- if (unlikely(ttm == NULL))
- return;
- if (ttm->state == tt_bound) {
- ttm_tt_unbind(ttm);
- }
- if (ttm->state == tt_unbound)
- ttm_tt_unpopulate(ttm);
- if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
- ttm->swap_storage)
- fput(ttm->swap_storage);
- ttm->swap_storage = NULL;
- ttm->func->destroy(ttm);
- }
- int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
- unsigned long size, uint32_t page_flags,
- struct page *dummy_read_page)
- {
- ttm->bdev = bdev;
- ttm->glob = bdev->glob;
- ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
- ttm->caching_state = tt_cached;
- ttm->page_flags = page_flags;
- ttm->dummy_read_page = dummy_read_page;
- ttm->state = tt_unpopulated;
- ttm->swap_storage = NULL;
- ttm_tt_alloc_page_directory(ttm);
- if (!ttm->pages) {
- ttm_tt_destroy(ttm);
- pr_err("Failed allocating page table\n");
- return -ENOMEM;
- }
- return 0;
- }
- EXPORT_SYMBOL(ttm_tt_init);
- void ttm_tt_fini(struct ttm_tt *ttm)
- {
- drm_free_large(ttm->pages);
- ttm->pages = NULL;
- }
- EXPORT_SYMBOL(ttm_tt_fini);
- int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
- unsigned long size, uint32_t page_flags,
- struct page *dummy_read_page)
- {
- struct ttm_tt *ttm = &ttm_dma->ttm;
- ttm->bdev = bdev;
- ttm->glob = bdev->glob;
- ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
- ttm->caching_state = tt_cached;
- ttm->page_flags = page_flags;
- ttm->dummy_read_page = dummy_read_page;
- ttm->state = tt_unpopulated;
- ttm->swap_storage = NULL;
- INIT_LIST_HEAD(&ttm_dma->pages_list);
- ttm_dma_tt_alloc_page_directory(ttm_dma);
- if (!ttm->pages) {
- ttm_tt_destroy(ttm);
- pr_err("Failed allocating page table\n");
- return -ENOMEM;
- }
- return 0;
- }
- EXPORT_SYMBOL(ttm_dma_tt_init);
- void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
- {
- struct ttm_tt *ttm = &ttm_dma->ttm;
- drm_free_large(ttm->pages);
- ttm->pages = NULL;
- ttm_dma->cpu_address = NULL;
- ttm_dma->dma_address = NULL;
- }
- EXPORT_SYMBOL(ttm_dma_tt_fini);
- void ttm_tt_unbind(struct ttm_tt *ttm)
- {
- int ret;
- if (ttm->state == tt_bound) {
- ret = ttm->func->unbind(ttm);
- BUG_ON(ret);
- ttm->state = tt_unbound;
- }
- }
- int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
- {
- int ret = 0;
- if (!ttm)
- return -EINVAL;
- if (ttm->state == tt_bound)
- return 0;
- ret = ttm->bdev->driver->ttm_tt_populate(ttm);
- if (ret)
- return ret;
- ret = ttm->func->bind(ttm, bo_mem);
- if (unlikely(ret != 0))
- return ret;
- ttm->state = tt_bound;
- return 0;
- }
- EXPORT_SYMBOL(ttm_tt_bind);
- int ttm_tt_swapin(struct ttm_tt *ttm)
- {
- struct address_space *swap_space;
- struct file *swap_storage;
- struct page *from_page;
- struct page *to_page;
- int i;
- int ret = -ENOMEM;
- swap_storage = ttm->swap_storage;
- BUG_ON(swap_storage == NULL);
- swap_space = file_inode(swap_storage)->i_mapping;
- for (i = 0; i < ttm->num_pages; ++i) {
- from_page = shmem_read_mapping_page(swap_space, i);
- if (IS_ERR(from_page)) {
- ret = PTR_ERR(from_page);
- goto out_err;
- }
- to_page = ttm->pages[i];
- if (unlikely(to_page == NULL))
- goto out_err;
- copy_highpage(to_page, from_page);
- page_cache_release(from_page);
- }
- if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
- fput(swap_storage);
- ttm->swap_storage = NULL;
- ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
- return 0;
- out_err:
- return ret;
- }
- int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
- {
- struct address_space *swap_space;
- struct file *swap_storage;
- struct page *from_page;
- struct page *to_page;
- int i;
- int ret = -ENOMEM;
- BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
- BUG_ON(ttm->caching_state != tt_cached);
- if (!persistent_swap_storage) {
- swap_storage = shmem_file_setup("ttm swap",
- ttm->num_pages << PAGE_SHIFT,
- 0);
- if (IS_ERR(swap_storage)) {
- pr_err("Failed allocating swap storage\n");
- return PTR_ERR(swap_storage);
- }
- } else
- swap_storage = persistent_swap_storage;
- swap_space = file_inode(swap_storage)->i_mapping;
- for (i = 0; i < ttm->num_pages; ++i) {
- from_page = ttm->pages[i];
- if (unlikely(from_page == NULL))
- continue;
- to_page = shmem_read_mapping_page(swap_space, i);
- if (IS_ERR(to_page)) {
- ret = PTR_ERR(to_page);
- goto out_err;
- }
- copy_highpage(to_page, from_page);
- set_page_dirty(to_page);
- mark_page_accessed(to_page);
- page_cache_release(to_page);
- }
- ttm_tt_unpopulate(ttm);
- ttm->swap_storage = swap_storage;
- ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
- if (persistent_swap_storage)
- ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
- return 0;
- out_err:
- if (!persistent_swap_storage)
- fput(swap_storage);
- return ret;
- }
- static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
- {
- pgoff_t i;
- struct page **page = ttm->pages;
- if (ttm->page_flags & TTM_PAGE_FLAG_SG)
- return;
- for (i = 0; i < ttm->num_pages; ++i) {
- (*page)->mapping = NULL;
- (*page++)->index = 0;
- }
- }
- void ttm_tt_unpopulate(struct ttm_tt *ttm)
- {
- if (ttm->state == tt_unpopulated)
- return;
- ttm_tt_clear_mapping(ttm);
- ttm->bdev->driver->ttm_tt_unpopulate(ttm);
- }
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