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drm/ttm: move more logic into ttm_page_pool_get_pages 

Make it easier to add huge page pool.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2017-09-21 11:28:25 +02:00 committed by Alex Deucher
parent 0284f1ead8
commit 8593e9b85e
1 changed files with 52 additions and 46 deletions
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98
drivers/gpu/drm/ttm/ttm_page_alloc.c
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@ -627,19 +627,20 @@ static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool,
}
/**
* Cut 'count' number of pages from the pool and put them on the return list.
* Allocate pages from the pool and put them on the return list.
*
* @return count of pages still required to fulfill the request.
* @return zero for success or negative error code.
*/
static unsigned ttm_page_pool_get_pages(struct ttm_page_pool *pool,
struct list_head *pages,
int ttm_flags,
enum ttm_caching_state cstate,
unsigned count)
static int ttm_page_pool_get_pages(struct ttm_page_pool *pool,
struct list_head *pages,
int ttm_flags,
enum ttm_caching_state cstate,
unsigned count)
{
unsigned long irq_flags;
struct list_head *p;
unsigned i;
int r = 0;
spin_lock_irqsave(&pool->lock, irq_flags);
ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count, &irq_flags);
@ -672,7 +673,35 @@ static unsigned ttm_page_pool_get_pages(struct ttm_page_pool *pool,
count = 0;
out:
spin_unlock_irqrestore(&pool->lock, irq_flags);
return count;
/* clear the pages coming from the pool if requested */
if (ttm_flags & TTM_PAGE_FLAG_ZERO_ALLOC) {
struct page *page;
list_for_each_entry(page, pages, lru) {
if (PageHighMem(page))
clear_highpage(page);
else
clear_page(page_address(page));
}
}
/* If pool didn't have enough pages allocate new one. */
if (count) {
gfp_t gfp_flags = pool->gfp_flags;
/* set zero flag for page allocation if required */
if (ttm_flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
/* ttm_alloc_new_pages doesn't reference pool so we can run
* multiple requests in parallel.
**/
r = ttm_alloc_new_pages(pages, gfp_flags, ttm_flags, cstate,
count);
}
return r;
}
/* Put all pages in pages list to correct pool to wait for reuse */
@ -742,18 +771,18 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct list_head plist;
struct page *p = NULL;
gfp_t gfp_flags = GFP_USER;
unsigned count;
int r;
/* set zero flag for page allocation if required */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
/* No pool for cached pages */
if (pool == NULL) {
gfp_t gfp_flags = GFP_USER;
unsigned i, j;
/* set zero flag for page allocation if required */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC)
gfp_flags |= __GFP_ZERO;
if (flags & TTM_PAGE_FLAG_DMA32)
gfp_flags |= GFP_DMA32;
else
@ -792,44 +821,21 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
return 0;
}
/* combine zero flag to pool flags */
gfp_flags |= pool->gfp_flags;
/* First we take pages from the pool */
INIT_LIST_HEAD(&plist);
npages = ttm_page_pool_get_pages(pool, &plist, flags, cstate, npages);
r = ttm_page_pool_get_pages(pool, &plist, flags, cstate, npages);
count = 0;
list_for_each_entry(p, &plist, lru) {
list_for_each_entry(p, &plist, lru)
pages[count++] = p;
}
/* clear the pages coming from the pool if requested */
if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) {
list_for_each_entry(p, &plist, lru) {
if (PageHighMem(p))
clear_highpage(p);
else
clear_page(page_address(p));
}
}
/* If pool didn't have enough pages allocate new one. */
if (npages > 0) {
/* ttm_alloc_new_pages doesn't reference pool so we can run
* multiple requests in parallel.
**/
INIT_LIST_HEAD(&plist);
r = ttm_alloc_new_pages(&plist, gfp_flags, flags, cstate, npages);
list_for_each_entry(p, &plist, lru) {
pages[count++] = p;
}
if (r) {
/* If there is any pages in the list put them back to
* the pool. */
pr_err("Failed to allocate extra pages for large request\n");
ttm_put_pages(pages, count, flags, cstate);
return r;
}
if (r) {
/* If there is any pages in the list put them back to
* the pool.
*/
pr_err("Failed to allocate extra pages for large request\n");
ttm_put_pages(pages, count, flags, cstate);
return r;
}
return 0;