/************************************************************************** * * 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> */ #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_cache.h" #include "drm_mem_util.h" #include "ttm/ttm_module.h" #include "ttm/ttm_bo_driver.h" #include "ttm/ttm_placement.h" #include "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(void*)); ttm->dma_address = drm_calloc_large(ttm->ttm.num_pages, sizeof(*ttm->dma_address)); } #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 (likely(ttm->pages != NULL)) { ttm->bdev->driver->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); printk(KERN_ERR TTM_PFX "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_dma->dma_address) { ttm_tt_destroy(ttm); printk(KERN_ERR TTM_PFX "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; drm_free_large(ttm_dma->dma_address); 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; void *from_virtual; void *to_virtual; int i; int ret = -ENOMEM; swap_storage = ttm->swap_storage; BUG_ON(swap_storage == NULL); swap_space = swap_storage->f_path.dentry->d_inode->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; preempt_disable(); from_virtual = kmap_atomic(from_page, KM_USER0); to_virtual = kmap_atomic(to_page, KM_USER1); memcpy(to_virtual, from_virtual, PAGE_SIZE); kunmap_atomic(to_virtual, KM_USER1); kunmap_atomic(from_virtual, KM_USER0); preempt_enable(); 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; void *from_virtual; void *to_virtual; 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 (unlikely(IS_ERR(swap_storage))) { printk(KERN_ERR "Failed allocating swap storage.\n"); return PTR_ERR(swap_storage); } } else swap_storage = persistent_swap_storage; swap_space = swap_storage->f_path.dentry->d_inode->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 (unlikely(IS_ERR(to_page))) { ret = PTR_ERR(to_page); goto out_err; } preempt_disable(); from_virtual = kmap_atomic(from_page, KM_USER0); to_virtual = kmap_atomic(to_page, KM_USER1); memcpy(to_virtual, from_virtual, PAGE_SIZE); kunmap_atomic(to_virtual, KM_USER1); kunmap_atomic(from_virtual, KM_USER0); preempt_enable(); set_page_dirty(to_page); mark_page_accessed(to_page); page_cache_release(to_page); } ttm->bdev->driver->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; }