diff options
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_tt.c')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_tt.c | 635 |
1 files changed, 635 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c new file mode 100644 index 00000000000..c27ab3a877a --- /dev/null +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -0,0 +1,635 @@ +/************************************************************************** + * + * 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/version.h> +#include <linux/vmalloc.h> +#include <linux/sched.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/file.h> +#include <linux/swap.h> +#include "ttm/ttm_module.h" +#include "ttm/ttm_bo_driver.h" +#include "ttm/ttm_placement.h" + +static int ttm_tt_swapin(struct ttm_tt *ttm); + +#if defined(CONFIG_X86) +static void ttm_tt_clflush_page(struct page *page) +{ + uint8_t *page_virtual; + unsigned int i; + + if (unlikely(page == NULL)) + return; + + page_virtual = kmap_atomic(page, KM_USER0); + + for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size) + clflush(page_virtual + i); + + kunmap_atomic(page_virtual, KM_USER0); +} + +static void ttm_tt_cache_flush_clflush(struct page *pages[], + unsigned long num_pages) +{ + unsigned long i; + + mb(); + for (i = 0; i < num_pages; ++i) + ttm_tt_clflush_page(*pages++); + mb(); +} +#else +static void ttm_tt_ipi_handler(void *null) +{ + ; +} +#endif + +void ttm_tt_cache_flush(struct page *pages[], unsigned long num_pages) +{ + +#if defined(CONFIG_X86) + if (cpu_has_clflush) { + ttm_tt_cache_flush_clflush(pages, num_pages); + return; + } +#else + if (on_each_cpu(ttm_tt_ipi_handler, NULL, 1) != 0) + printk(KERN_ERR TTM_PFX + "Timed out waiting for drm cache flush.\n"); +#endif +} + +/** + * Allocates storage for pointers to the pages that back the ttm. + * + * Uses kmalloc if possible. Otherwise falls back to vmalloc. + */ +static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm) +{ + unsigned long size = ttm->num_pages * sizeof(*ttm->pages); + ttm->pages = NULL; + + if (size <= PAGE_SIZE) + ttm->pages = kzalloc(size, GFP_KERNEL); + + if (!ttm->pages) { + ttm->pages = vmalloc_user(size); + if (ttm->pages) + ttm->page_flags |= TTM_PAGE_FLAG_VMALLOC; + } +} + +static void ttm_tt_free_page_directory(struct ttm_tt *ttm) +{ + if (ttm->page_flags & TTM_PAGE_FLAG_VMALLOC) { + vfree(ttm->pages); + ttm->page_flags &= ~TTM_PAGE_FLAG_VMALLOC; + } else { + kfree(ttm->pages); + } + ttm->pages = NULL; +} + +static struct page *ttm_tt_alloc_page(unsigned page_flags) +{ + if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC) + return alloc_page(GFP_HIGHUSER | __GFP_ZERO); + + return alloc_page(GFP_HIGHUSER); +} + +static void ttm_tt_free_user_pages(struct ttm_tt *ttm) +{ + int write; + int dirty; + struct page *page; + int i; + struct ttm_backend *be = ttm->be; + + BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER)); + write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0); + dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0); + + if (be) + be->func->clear(be); + + for (i = 0; i < ttm->num_pages; ++i) { + page = ttm->pages[i]; + if (page == NULL) + continue; + + if (page == ttm->dummy_read_page) { + BUG_ON(write); + continue; + } + + if (write && dirty && !PageReserved(page)) + set_page_dirty_lock(page); + + ttm->pages[i] = NULL; + ttm_mem_global_free(ttm->bdev->mem_glob, PAGE_SIZE, false); + put_page(page); + } + ttm->state = tt_unpopulated; + ttm->first_himem_page = ttm->num_pages; + ttm->last_lomem_page = -1; +} + +static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index) +{ + struct page *p; + struct ttm_bo_device *bdev = ttm->bdev; + struct ttm_mem_global *mem_glob = bdev->mem_glob; + int ret; + + while (NULL == (p = ttm->pages[index])) { + p = ttm_tt_alloc_page(ttm->page_flags); + + if (!p) + return NULL; + + if (PageHighMem(p)) { + ret = + ttm_mem_global_alloc(mem_glob, PAGE_SIZE, + false, false, true); + if (unlikely(ret != 0)) + goto out_err; + ttm->pages[--ttm->first_himem_page] = p; + } else { + ret = + ttm_mem_global_alloc(mem_glob, PAGE_SIZE, + false, false, false); + if (unlikely(ret != 0)) + goto out_err; + ttm->pages[++ttm->last_lomem_page] = p; + } + } + return p; +out_err: + put_page(p); + return NULL; +} + +struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index) +{ + int ret; + + if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { + ret = ttm_tt_swapin(ttm); + if (unlikely(ret != 0)) + return NULL; + } + return __ttm_tt_get_page(ttm, index); +} + +int ttm_tt_populate(struct ttm_tt *ttm) +{ + struct page *page; + unsigned long i; + struct ttm_backend *be; + int ret; + + if (ttm->state != tt_unpopulated) + return 0; + + if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { + ret = ttm_tt_swapin(ttm); + if (unlikely(ret != 0)) + return ret; + } + + be = ttm->be; + + for (i = 0; i < ttm->num_pages; ++i) { + page = __ttm_tt_get_page(ttm, i); + if (!page) + return -ENOMEM; + } + + be->func->populate(be, ttm->num_pages, ttm->pages, + ttm->dummy_read_page); + ttm->state = tt_unbound; + return 0; +} + +#ifdef CONFIG_X86 +static inline int ttm_tt_set_page_caching(struct page *p, + enum ttm_caching_state c_state) +{ + if (PageHighMem(p)) + return 0; + + switch (c_state) { + case tt_cached: + return set_pages_wb(p, 1); + case tt_wc: + return set_memory_wc((unsigned long) page_address(p), 1); + default: + return set_pages_uc(p, 1); + } +} +#else /* CONFIG_X86 */ +static inline int ttm_tt_set_page_caching(struct page *p, + enum ttm_caching_state c_state) +{ + 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 (c_state != tt_cached) { + ret = ttm_tt_populate(ttm); + if (unlikely(ret != 0)) + return ret; + } + + if (ttm->caching_state == tt_cached) + ttm_tt_cache_flush(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, 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, + 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); +} + +static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm) +{ + int i; + struct page *cur_page; + struct ttm_backend *be = ttm->be; + + if (be) + be->func->clear(be); + (void)ttm_tt_set_caching(ttm, tt_cached); + for (i = 0; i < ttm->num_pages; ++i) { + cur_page = ttm->pages[i]; + ttm->pages[i] = NULL; + if (cur_page) { + if (page_count(cur_page) != 1) + printk(KERN_ERR TTM_PFX + "Erroneous page count. " + "Leaking pages.\n"); + ttm_mem_global_free(ttm->bdev->mem_glob, PAGE_SIZE, + PageHighMem(cur_page)); + __free_page(cur_page); + } + } + ttm->state = tt_unpopulated; + ttm->first_himem_page = ttm->num_pages; + ttm->last_lomem_page = -1; +} + +void ttm_tt_destroy(struct ttm_tt *ttm) +{ + struct ttm_backend *be; + + if (unlikely(ttm == NULL)) + return; + + be = ttm->be; + if (likely(be != NULL)) { + be->func->destroy(be); + ttm->be = NULL; + } + + if (likely(ttm->pages != NULL)) { + if (ttm->page_flags & TTM_PAGE_FLAG_USER) + ttm_tt_free_user_pages(ttm); + else + ttm_tt_free_alloced_pages(ttm); + + ttm_tt_free_page_directory(ttm); + } + + if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) && + ttm->swap_storage) + fput(ttm->swap_storage); + + kfree(ttm); +} + +int ttm_tt_set_user(struct ttm_tt *ttm, + struct task_struct *tsk, + unsigned long start, unsigned long num_pages) +{ + struct mm_struct *mm = tsk->mm; + int ret; + int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0; + struct ttm_mem_global *mem_glob = ttm->bdev->mem_glob; + + BUG_ON(num_pages != ttm->num_pages); + BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0); + + /** + * Account user pages as lowmem pages for now. + */ + + ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE, + false, false, false); + if (unlikely(ret != 0)) + return ret; + + down_read(&mm->mmap_sem); + ret = get_user_pages(tsk, mm, start, num_pages, + write, 0, ttm->pages, NULL); + up_read(&mm->mmap_sem); + + if (ret != num_pages && write) { + ttm_tt_free_user_pages(ttm); + ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE, false); + return -ENOMEM; + } + + ttm->tsk = tsk; + ttm->start = start; + ttm->state = tt_unbound; + + return 0; +} + +struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size, + uint32_t page_flags, struct page *dummy_read_page) +{ + struct ttm_bo_driver *bo_driver = bdev->driver; + struct ttm_tt *ttm; + + if (!bo_driver) + return NULL; + + ttm = kzalloc(sizeof(*ttm), GFP_KERNEL); + if (!ttm) + return NULL; + + ttm->bdev = bdev; + + ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; + ttm->first_himem_page = ttm->num_pages; + ttm->last_lomem_page = -1; + ttm->caching_state = tt_cached; + ttm->page_flags = page_flags; + + ttm->dummy_read_page = dummy_read_page; + + ttm_tt_alloc_page_directory(ttm); + if (!ttm->pages) { + ttm_tt_destroy(ttm); + printk(KERN_ERR TTM_PFX "Failed allocating page table\n"); + return NULL; + } + ttm->be = bo_driver->create_ttm_backend_entry(bdev); + if (!ttm->be) { + ttm_tt_destroy(ttm); + printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n"); + return NULL; + } + ttm->state = tt_unpopulated; + return ttm; +} + +void ttm_tt_unbind(struct ttm_tt *ttm) +{ + int ret; + struct ttm_backend *be = ttm->be; + + if (ttm->state == tt_bound) { + ret = be->func->unbind(be); + BUG_ON(ret); + ttm->state = tt_unbound; + } +} + +int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem) +{ + int ret = 0; + struct ttm_backend *be; + + if (!ttm) + return -EINVAL; + + if (ttm->state == tt_bound) + return 0; + + be = ttm->be; + + ret = ttm_tt_populate(ttm); + if (ret) + return ret; + + ret = be->func->bind(be, bo_mem); + if (ret) { + printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n"); + return ret; + } + + ttm->state = tt_bound; + + if (ttm->page_flags & TTM_PAGE_FLAG_USER) + ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY; + return 0; +} +EXPORT_SYMBOL(ttm_tt_bind); + +static 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; + + if (ttm->page_flags & TTM_PAGE_FLAG_USER) { + ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start, + ttm->num_pages); + if (unlikely(ret != 0)) + return ret; + + ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; + return 0; + } + + 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 = read_mapping_page(swap_space, i, NULL); + if (IS_ERR(from_page)) + goto out_err; + to_page = __ttm_tt_get_page(ttm, 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_PERSISTANT_SWAP)) + fput(swap_storage); + ttm->swap_storage = NULL; + ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED; + + return 0; +out_err: + ttm_tt_free_alloced_pages(ttm); + return -ENOMEM; +} + +int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_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; + + BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated); + BUG_ON(ttm->caching_state != tt_cached); + + /* + * For user buffers, just unpin the pages, as there should be + * vma references. + */ + + if (ttm->page_flags & TTM_PAGE_FLAG_USER) { + ttm_tt_free_user_pages(ttm); + ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; + ttm->swap_storage = NULL; + return 0; + } + + if (!persistant_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 -ENOMEM; + } + } else + swap_storage = persistant_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 = read_mapping_page(swap_space, i, NULL); + 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(); + set_page_dirty(to_page); + mark_page_accessed(to_page); + page_cache_release(to_page); + } + + ttm_tt_free_alloced_pages(ttm); + ttm->swap_storage = swap_storage; + ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED; + if (persistant_swap_storage) + ttm->page_flags |= TTM_PAGE_FLAG_PERSISTANT_SWAP; + + return 0; +out_err: + if (!persistant_swap_storage) + fput(swap_storage); + + return -ENOMEM; +} |