linux/drivers/gpu/drm/ttm/ttm_tt.c
Thomas Hellstrom 1b76af5ce8 drm/ttm: Don't clear page metadata of imported sg pages
These page pointers shouldn't be visible to TTM in the first place, but
until we fix that up, don't clear the page metadata because that
will upset the exporter.

Reported-and-tested-by: Cristoph Haag <haagch.christoph@googleemail.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
2014-02-05 16:03:29 +01:00

400 lines
9.3 KiB
C

/**************************************************************************
*
* 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(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 (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_dma->dma_address) {
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;
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;
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);
}