From 7924d9d4dc9ffff32bf099db8c638e11e5457cd7 Mon Sep 17 00:00:00 2001 From: Matthew Auld Date: Fri, 6 Oct 2017 23:18:30 +0100 Subject: [PATCH] drm/i915/selftests: mix huge pages Try to mix sg page sizes for 4K, 64K and 2M pages. v2: s/BIT(x) >> 12/BIT(x) >> PAGE_SHIFT/ Suggested-by: Chris Wilson Signed-off-by: Matthew Auld Cc: Joonas Lahtinen Cc: Chris Wilson Reviewed-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-19-matthew.auld@intel.com Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-18-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/selftests/scatterlist.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/i915/selftests/scatterlist.c b/drivers/gpu/drm/i915/selftests/scatterlist.c index 1cc5d29..cd6d2a1 100644 --- a/drivers/gpu/drm/i915/selftests/scatterlist.c +++ b/drivers/gpu/drm/i915/selftests/scatterlist.c @@ -189,6 +189,20 @@ static unsigned int random(unsigned long n, return 1 + (prandom_u32_state(rnd) % 1024); } +static unsigned int random_page_size_pages(unsigned long n, + unsigned long count, + struct rnd_state *rnd) +{ + /* 4K, 64K, 2M */ + static unsigned int page_count[] = { + BIT(12) >> PAGE_SHIFT, + BIT(16) >> PAGE_SHIFT, + BIT(21) >> PAGE_SHIFT, + }; + + return page_count[(prandom_u32_state(rnd) % 3)]; +} + static inline bool page_contiguous(struct page *first, struct page *last, unsigned long npages) @@ -252,6 +266,7 @@ static const npages_fn_t npages_funcs[] = { grow, shrink, random, + random_page_size_pages, NULL, }; -- 2.7.4