Commit 4010ce9f authored by Arunpravin's avatar Arunpravin Committed by Christian König
Browse files

drm/selftests: add drm buddy optimistic testcase 



create a mm with one block of each order available, and
try to allocate them all.

v2(Matthew Auld):
  - removed unnecessary test succeeded print
  - replace list_del()/list_add_tail() with list_move_tail()

Signed-off-by: default avatarArunpravin <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
Acked-by: default avatarChristian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220222174845.2175-4-Arunpravin.PaneerSelvam@amd.com


Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
parent 92937f17

drivers/gpu/drm/selftests/drm_buddy_selftests.h

+1 −0
Original line number Diff line number Diff line
@@ -9,3 +9,4 @@ 
selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */

selftest(buddy_alloc_limit, igt_buddy_alloc_limit)

selftest(buddy_alloc_range, igt_buddy_alloc_range)

selftest(buddy_alloc_optimistic, igt_buddy_alloc_optimistic)

drivers/gpu/drm/selftests/test-drm_buddy.c

+80 −0
Original line number Diff line number Diff line
@@ -17,6 +17,11 @@ 


static unsigned int random_seed;



static inline u64 get_size(int order, u64 chunk_size)

{

	return (1 << order) * chunk_size;

}



static inline const char *yesno(bool v)

{

	return v ? "yes" : "no";
@@ -309,6 +314,81 @@ static void igt_mm_config(u64 *size, u64 *chunk_size) 
	*size = (u64)s << 12;

}



static int igt_buddy_alloc_optimistic(void *arg)

{

	u64 mm_size, size, min_page_size, start = 0;

	struct drm_buddy_block *block;

	unsigned long flags = 0;

	const int max_order = 16;

	struct drm_buddy mm;

	LIST_HEAD(blocks);

	LIST_HEAD(tmp);

	int order, err;



	/*

	 * Create a mm with one block of each order available, and

	 * try to allocate them all.

	 */



	mm_size = PAGE_SIZE * ((1 << (max_order + 1)) - 1);

	err = drm_buddy_init(&mm,

			     mm_size,

			     PAGE_SIZE);

	if (err) {

		pr_err("buddy_init failed(%d)\n", err);

		return err;

	}



	BUG_ON(mm.max_order != max_order);



	for (order = 0; order <= max_order; order++) {

		size = min_page_size = get_size(order, PAGE_SIZE);

		err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);

		if (err) {

			pr_info("buddy_alloc hit -ENOMEM with order=%d\n",

				order);

			goto err;

		}



		block = list_first_entry_or_null(&tmp,

						 struct drm_buddy_block,

						 link);

		if (!block) {

			pr_err("alloc_blocks has no blocks\n");

			err = -EINVAL;

			goto err;

		}



		list_move_tail(&block->link, &blocks);

	}



	/* Should be completely full! */

	size = min_page_size = get_size(0, PAGE_SIZE);

	err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);

	if (!err) {

		pr_info("buddy_alloc unexpectedly succeeded, it should be full!");

		block = list_first_entry_or_null(&tmp,

						 struct drm_buddy_block,

						 link);

		if (!block) {

			pr_err("alloc_blocks has no blocks\n");

			err = -EINVAL;

			goto err;

		}



		list_move_tail(&block->link, &blocks);

		err = -EINVAL;

		goto err;

	} else {

		err = 0;

	}



err:

	drm_buddy_free_list(&mm, &blocks);

	drm_buddy_fini(&mm);

	return err;

}



static int igt_buddy_alloc_range(void *arg)

{

	unsigned long flags = DRM_BUDDY_RANGE_ALLOCATION;