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authorChristian König <christian.koenig@amd.com>2017-12-04 11:17:54 +0100
committerAlex Deucher <alexander.deucher@amd.com>2017-12-05 14:37:06 -0500
commit5ff7ec02f2f306d619c661ff8fd5392d3653d407 (patch)
tree14bc4e2f64196ad7f8cc60a80b94235a93b3b51f /drivers/gpu
parent2bf257d662509553ae226239e7dc1c3d00636ca6 (diff)
downloadlinux-5ff7ec02f2f306d619c661ff8fd5392d3653d407.tar.bz2
drm/ttm: swap consecutive allocated cached pages v3
When we detect consecutive allocation of pages swap them to avoid accidentally freeing them as huge page. v2: use swap v3: check if it's really the first allocated page Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Roger He <Hongbo.He@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/ttm/ttm_page_alloc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 116897a20514..b6f7ce286fb1 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -877,7 +877,7 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
#endif
struct list_head plist;
struct page *p = NULL;
- unsigned count;
+ unsigned count, first;
int r;
/* No pool for cached pages */
@@ -918,6 +918,7 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
}
#endif
+ first = i;
while (npages) {
p = alloc_page(gfp_flags);
if (!p) {
@@ -925,6 +926,10 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
return -ENOMEM;
}
+ /* Swap the pages if we detect consecutive order */
+ if (i > first && pages[i - 1] == p - 1)
+ swap(p, pages[i - 1]);
+
pages[i++] = p;
--npages;
}