From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/gpu/drm/ttm/ttm_tt.c | 402 ++++++++++++++++++++++++++++++++++++ 1 file changed, 402 insertions(+) create mode 100644 kernel/drivers/gpu/drm/ttm/ttm_tt.c (limited to 'kernel/drivers/gpu/drm/ttm/ttm_tt.c') diff --git a/kernel/drivers/gpu/drm/ttm/ttm_tt.c b/kernel/drivers/gpu/drm/ttm/ttm_tt.c new file mode 100644 index 000000000..bf080abc8 --- /dev/null +++ b/kernel/drivers/gpu/drm/ttm/ttm_tt.c @@ -0,0 +1,402 @@ +/************************************************************************** + * + * 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 + */ + +#define pr_fmt(fmt) "[TTM] " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/** + * 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 (unlikely(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 (unlikely(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); +} -- cgit 1.2.3-korg