139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/*
|
|
* Copyright (c) Red Hat Inc.
|
|
|
|
* 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 AUTHORS OR COPYRIGHT HOLDERS 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: Dave Airlie <airlied@redhat.com>
|
|
*/
|
|
|
|
/* simple list based uncached page allocator
|
|
* - Add chunks of 1MB to the allocator at a time.
|
|
* - Use page->lru to keep a free list
|
|
* - doesn't track currently in use pages
|
|
*
|
|
* TODO: Add shrinker support
|
|
*/
|
|
|
|
#include "drmP.h"
|
|
#include <asm/agp.h>
|
|
|
|
static struct list_head uncached_free_list;
|
|
|
|
static struct mutex uncached_mutex;
|
|
static int uncached_inited;
|
|
static int total_uncached_pages;
|
|
|
|
/* add 1MB at a time */
|
|
#define NUM_PAGES_TO_ADD 256
|
|
|
|
static void drm_uncached_page_put(struct page *page)
|
|
{
|
|
unmap_page_from_agp(page);
|
|
put_page(page);
|
|
__free_page(page);
|
|
}
|
|
|
|
int drm_uncached_add_pages_locked(int num_pages)
|
|
{
|
|
struct page *page;
|
|
int i;
|
|
|
|
DRM_DEBUG("adding uncached memory %ld\n", num_pages * PAGE_SIZE);
|
|
for (i = 0; i < num_pages; i++) {
|
|
|
|
page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
|
|
if (!page) {
|
|
DRM_ERROR("unable to get page %d\n", i);
|
|
return i;
|
|
}
|
|
|
|
get_page(page);
|
|
#ifdef CONFIG_X86
|
|
set_memory_wc((unsigned long)page_address(page), 1);
|
|
#else
|
|
map_page_into_agp(page);
|
|
#endif
|
|
|
|
list_add(&page->lru, &uncached_free_list);
|
|
total_uncached_pages++;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
struct page *drm_get_uncached_page(void)
|
|
{
|
|
struct page *page = NULL;
|
|
int ret;
|
|
|
|
mutex_lock(&uncached_mutex);
|
|
if (list_empty(&uncached_free_list)) {
|
|
ret = drm_uncached_add_pages_locked(NUM_PAGES_TO_ADD);
|
|
if (ret == 0)
|
|
return NULL;
|
|
}
|
|
|
|
page = list_first_entry(&uncached_free_list, struct page, lru);
|
|
list_del(&page->lru);
|
|
|
|
mutex_unlock(&uncached_mutex);
|
|
return page;
|
|
}
|
|
|
|
void drm_put_uncached_page(struct page *page)
|
|
{
|
|
mutex_lock(&uncached_mutex);
|
|
list_add(&page->lru, &uncached_free_list);
|
|
mutex_unlock(&uncached_mutex);
|
|
}
|
|
|
|
void drm_uncached_release_all_pages(void)
|
|
{
|
|
struct page *page, *tmp;
|
|
|
|
list_for_each_entry_safe(page, tmp, &uncached_free_list, lru) {
|
|
list_del(&page->lru);
|
|
drm_uncached_page_put(page);
|
|
}
|
|
}
|
|
|
|
int drm_uncached_init(void)
|
|
{
|
|
|
|
if (uncached_inited)
|
|
return 0;
|
|
|
|
INIT_LIST_HEAD(&uncached_free_list);
|
|
|
|
mutex_init(&uncached_mutex);
|
|
uncached_inited = 1;
|
|
return 0;
|
|
|
|
}
|
|
|
|
void drm_uncached_fini(void)
|
|
{
|
|
if (!uncached_inited)
|
|
return;
|
|
|
|
uncached_inited = 0;
|
|
drm_uncached_release_all_pages();
|
|
}
|
|
|