/**************************************************************************
*
* 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 <syscall.h>
#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>
#undef CONFIG_X86
/**
* 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);
printf("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);
printf("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);
#if 0
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 (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 (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;
}
#endif
static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
{
pgoff_t i;
struct page **page = ttm->pages;
}
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);
}