586 lines
13 KiB
C
586 lines
13 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#include <linux/vmalloc.h>
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#include <linux/sched.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/file.h>
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#include <linux/swap.h>
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#include "drm_cache.h"
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#include "ttm/ttm_module.h"
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#include "ttm/ttm_bo_driver.h"
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#include "ttm/ttm_placement.h"
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static int ttm_tt_swapin(struct ttm_tt *ttm);
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/**
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* Allocates storage for pointers to the pages that back the ttm.
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*
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* Uses kmalloc if possible. Otherwise falls back to vmalloc.
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*/
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static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
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{
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unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
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ttm->pages = NULL;
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if (size <= PAGE_SIZE)
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ttm->pages = kzalloc(size, GFP_KERNEL);
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if (!ttm->pages) {
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ttm->pages = vmalloc_user(size);
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if (ttm->pages)
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ttm->page_flags |= TTM_PAGE_FLAG_VMALLOC;
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}
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}
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static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
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{
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if (ttm->page_flags & TTM_PAGE_FLAG_VMALLOC) {
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vfree(ttm->pages);
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ttm->page_flags &= ~TTM_PAGE_FLAG_VMALLOC;
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} else {
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kfree(ttm->pages);
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}
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ttm->pages = NULL;
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}
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static struct page *ttm_tt_alloc_page(unsigned page_flags)
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{
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gfp_t gfp_flags = GFP_USER;
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if (page_flags & TTM_PAGE_FLAG_ZERO_ALLOC)
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gfp_flags |= __GFP_ZERO;
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if (page_flags & TTM_PAGE_FLAG_DMA32)
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gfp_flags |= __GFP_DMA32;
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else
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gfp_flags |= __GFP_HIGHMEM;
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return alloc_page(gfp_flags);
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}
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static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
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{
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int write;
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int dirty;
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struct page *page;
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int i;
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struct ttm_backend *be = ttm->be;
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BUG_ON(!(ttm->page_flags & TTM_PAGE_FLAG_USER));
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write = ((ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0);
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dirty = ((ttm->page_flags & TTM_PAGE_FLAG_USER_DIRTY) != 0);
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if (be)
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be->func->clear(be);
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for (i = 0; i < ttm->num_pages; ++i) {
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page = ttm->pages[i];
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if (page == NULL)
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continue;
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if (page == ttm->dummy_read_page) {
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BUG_ON(write);
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continue;
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}
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if (write && dirty && !PageReserved(page))
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set_page_dirty_lock(page);
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ttm->pages[i] = NULL;
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ttm_mem_global_free(ttm->glob->mem_glob, PAGE_SIZE);
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put_page(page);
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}
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ttm->state = tt_unpopulated;
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ttm->first_himem_page = ttm->num_pages;
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ttm->last_lomem_page = -1;
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}
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static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
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{
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struct page *p;
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struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
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int ret;
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while (NULL == (p = ttm->pages[index])) {
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p = ttm_tt_alloc_page(ttm->page_flags);
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if (!p)
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return NULL;
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ret = ttm_mem_global_alloc_page(mem_glob, p, false, false);
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if (unlikely(ret != 0))
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goto out_err;
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if (PageHighMem(p))
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ttm->pages[--ttm->first_himem_page] = p;
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else
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ttm->pages[++ttm->last_lomem_page] = p;
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}
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return p;
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out_err:
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put_page(p);
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return NULL;
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}
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struct page *ttm_tt_get_page(struct ttm_tt *ttm, int index)
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{
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int ret;
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if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
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ret = ttm_tt_swapin(ttm);
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if (unlikely(ret != 0))
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return NULL;
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}
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return __ttm_tt_get_page(ttm, index);
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}
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int ttm_tt_populate(struct ttm_tt *ttm)
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{
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struct page *page;
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unsigned long i;
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struct ttm_backend *be;
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int ret;
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if (ttm->state != tt_unpopulated)
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return 0;
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if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
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ret = ttm_tt_swapin(ttm);
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if (unlikely(ret != 0))
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return ret;
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}
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be = ttm->be;
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for (i = 0; i < ttm->num_pages; ++i) {
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page = __ttm_tt_get_page(ttm, i);
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if (!page)
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return -ENOMEM;
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}
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be->func->populate(be, ttm->num_pages, ttm->pages,
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ttm->dummy_read_page);
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ttm->state = tt_unbound;
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return 0;
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}
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#ifdef CONFIG_X86
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static inline int ttm_tt_set_page_caching(struct page *p,
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enum ttm_caching_state c_state)
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{
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if (PageHighMem(p))
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return 0;
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switch (c_state) {
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case tt_cached:
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return set_pages_wb(p, 1);
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case tt_wc:
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return set_memory_wc((unsigned long) page_address(p), 1);
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default:
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return set_pages_uc(p, 1);
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}
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}
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#else /* CONFIG_X86 */
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static inline int ttm_tt_set_page_caching(struct page *p,
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enum ttm_caching_state c_state)
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{
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return 0;
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}
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#endif /* CONFIG_X86 */
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/*
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* Change caching policy for the linear kernel map
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* for range of pages in a ttm.
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*/
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static int ttm_tt_set_caching(struct ttm_tt *ttm,
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enum ttm_caching_state c_state)
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{
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int i, j;
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struct page *cur_page;
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int ret;
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if (ttm->caching_state == c_state)
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return 0;
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if (c_state != tt_cached) {
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ret = ttm_tt_populate(ttm);
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if (unlikely(ret != 0))
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return ret;
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}
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if (ttm->caching_state == tt_cached)
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drm_clflush_pages(ttm->pages, ttm->num_pages);
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for (i = 0; i < ttm->num_pages; ++i) {
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cur_page = ttm->pages[i];
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if (likely(cur_page != NULL)) {
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ret = ttm_tt_set_page_caching(cur_page, c_state);
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if (unlikely(ret != 0))
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goto out_err;
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}
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}
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ttm->caching_state = c_state;
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return 0;
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out_err:
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for (j = 0; j < i; ++j) {
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cur_page = ttm->pages[j];
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if (likely(cur_page != NULL)) {
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(void)ttm_tt_set_page_caching(cur_page,
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ttm->caching_state);
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}
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}
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return ret;
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}
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int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
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{
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enum ttm_caching_state state;
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if (placement & TTM_PL_FLAG_WC)
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state = tt_wc;
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else if (placement & TTM_PL_FLAG_UNCACHED)
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state = tt_uncached;
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else
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state = tt_cached;
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return ttm_tt_set_caching(ttm, state);
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}
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EXPORT_SYMBOL(ttm_tt_set_placement_caching);
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static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
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{
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int i;
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struct page *cur_page;
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struct ttm_backend *be = ttm->be;
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if (be)
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be->func->clear(be);
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(void)ttm_tt_set_caching(ttm, tt_cached);
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for (i = 0; i < ttm->num_pages; ++i) {
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cur_page = ttm->pages[i];
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ttm->pages[i] = NULL;
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if (cur_page) {
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if (page_count(cur_page) != 1)
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printk(KERN_ERR TTM_PFX
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"Erroneous page count. "
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"Leaking pages.\n");
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ttm_mem_global_free_page(ttm->glob->mem_glob,
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cur_page);
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__free_page(cur_page);
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}
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}
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ttm->state = tt_unpopulated;
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ttm->first_himem_page = ttm->num_pages;
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ttm->last_lomem_page = -1;
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}
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void ttm_tt_destroy(struct ttm_tt *ttm)
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{
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struct ttm_backend *be;
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if (unlikely(ttm == NULL))
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return;
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be = ttm->be;
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if (likely(be != NULL)) {
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be->func->destroy(be);
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ttm->be = NULL;
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}
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if (likely(ttm->pages != NULL)) {
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if (ttm->page_flags & TTM_PAGE_FLAG_USER)
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ttm_tt_free_user_pages(ttm);
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else
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ttm_tt_free_alloced_pages(ttm);
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ttm_tt_free_page_directory(ttm);
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}
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if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP) &&
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ttm->swap_storage)
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fput(ttm->swap_storage);
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kfree(ttm);
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}
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int ttm_tt_set_user(struct ttm_tt *ttm,
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struct task_struct *tsk,
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unsigned long start, unsigned long num_pages)
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{
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struct mm_struct *mm = tsk->mm;
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int ret;
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int write = (ttm->page_flags & TTM_PAGE_FLAG_WRITE) != 0;
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struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
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BUG_ON(num_pages != ttm->num_pages);
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BUG_ON((ttm->page_flags & TTM_PAGE_FLAG_USER) == 0);
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/**
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* Account user pages as lowmem pages for now.
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*/
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ret = ttm_mem_global_alloc(mem_glob, num_pages * PAGE_SIZE,
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false, false);
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if (unlikely(ret != 0))
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return ret;
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down_read(&mm->mmap_sem);
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ret = get_user_pages(tsk, mm, start, num_pages,
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write, 0, ttm->pages, NULL);
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up_read(&mm->mmap_sem);
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if (ret != num_pages && write) {
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ttm_tt_free_user_pages(ttm);
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ttm_mem_global_free(mem_glob, num_pages * PAGE_SIZE);
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return -ENOMEM;
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}
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ttm->tsk = tsk;
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ttm->start = start;
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ttm->state = tt_unbound;
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return 0;
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}
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struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
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uint32_t page_flags, struct page *dummy_read_page)
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{
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struct ttm_bo_driver *bo_driver = bdev->driver;
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struct ttm_tt *ttm;
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if (!bo_driver)
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return NULL;
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ttm = kzalloc(sizeof(*ttm), GFP_KERNEL);
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if (!ttm)
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return NULL;
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ttm->glob = bdev->glob;
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ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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ttm->first_himem_page = ttm->num_pages;
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ttm->last_lomem_page = -1;
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ttm->caching_state = tt_cached;
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ttm->page_flags = page_flags;
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ttm->dummy_read_page = dummy_read_page;
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ttm_tt_alloc_page_directory(ttm);
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if (!ttm->pages) {
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ttm_tt_destroy(ttm);
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printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
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return NULL;
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}
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ttm->be = bo_driver->create_ttm_backend_entry(bdev);
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if (!ttm->be) {
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ttm_tt_destroy(ttm);
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printk(KERN_ERR TTM_PFX "Failed creating ttm backend entry\n");
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return NULL;
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}
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ttm->state = tt_unpopulated;
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return ttm;
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}
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void ttm_tt_unbind(struct ttm_tt *ttm)
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{
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int ret;
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struct ttm_backend *be = ttm->be;
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if (ttm->state == tt_bound) {
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ret = be->func->unbind(be);
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BUG_ON(ret);
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ttm->state = tt_unbound;
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}
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}
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int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
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{
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int ret = 0;
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struct ttm_backend *be;
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if (!ttm)
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return -EINVAL;
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if (ttm->state == tt_bound)
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return 0;
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be = ttm->be;
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ret = ttm_tt_populate(ttm);
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if (ret)
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return ret;
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ret = be->func->bind(be, bo_mem);
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if (ret) {
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printk(KERN_ERR TTM_PFX "Couldn't bind backend.\n");
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return ret;
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}
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ttm->state = tt_bound;
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if (ttm->page_flags & TTM_PAGE_FLAG_USER)
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ttm->page_flags |= TTM_PAGE_FLAG_USER_DIRTY;
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return 0;
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}
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EXPORT_SYMBOL(ttm_tt_bind);
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static int ttm_tt_swapin(struct ttm_tt *ttm)
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{
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struct address_space *swap_space;
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struct file *swap_storage;
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struct page *from_page;
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struct page *to_page;
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void *from_virtual;
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void *to_virtual;
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int i;
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int ret;
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if (ttm->page_flags & TTM_PAGE_FLAG_USER) {
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ret = ttm_tt_set_user(ttm, ttm->tsk, ttm->start,
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ttm->num_pages);
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if (unlikely(ret != 0))
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return ret;
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ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
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return 0;
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}
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swap_storage = ttm->swap_storage;
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BUG_ON(swap_storage == NULL);
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swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
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for (i = 0; i < ttm->num_pages; ++i) {
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from_page = read_mapping_page(swap_space, i, NULL);
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if (IS_ERR(from_page))
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goto out_err;
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to_page = __ttm_tt_get_page(ttm, i);
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if (unlikely(to_page == NULL))
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goto out_err;
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preempt_disable();
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from_virtual = kmap_atomic(from_page, KM_USER0);
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to_virtual = kmap_atomic(to_page, KM_USER1);
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memcpy(to_virtual, from_virtual, PAGE_SIZE);
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kunmap_atomic(to_virtual, KM_USER1);
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kunmap_atomic(from_virtual, KM_USER0);
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preempt_enable();
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page_cache_release(from_page);
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}
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if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTANT_SWAP))
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fput(swap_storage);
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ttm->swap_storage = NULL;
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ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
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return 0;
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out_err:
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ttm_tt_free_alloced_pages(ttm);
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return -ENOMEM;
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}
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int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistant_swap_storage)
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{
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struct address_space *swap_space;
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struct file *swap_storage;
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struct page *from_page;
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struct page *to_page;
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void *from_virtual;
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void *to_virtual;
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int i;
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BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
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BUG_ON(ttm->caching_state != tt_cached);
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/*
|
|
* 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;
|
|
}
|