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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 <chris@chris-wilson.co.uk>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-19-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-18-chris@chris-wilson.co.uk
This commit is contained in:
Matthew Auld 2017-10-06 23:18:30 +01:00 committed by Chris Wilson
parent 4049866f09
commit 7924d9d4dc
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/i915/selftests/scatterlist.c
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@ -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,
};