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Commit 05ab3c2e authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm: kselftest for drm_mm and top-down allocation 



Check that if we request top-down allocation from drm_mm_insert_node()
we receive the next available hole from the top.

v2: Flip sign on conditional assert.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-17-chris@chris-wilson.co.uk
parent 0e483254

drivers/gpu/drm/selftests/drm_mm_selftests.h

+1 −0
Original line number Diff line number Diff line
@@ -17,3 +17,4 @@ selftest(align32, igt_align32) 
selftest(align64, igt_align64)

selftest(evict, igt_evict)

selftest(evict_range, igt_evict_range)

selftest(topdown, igt_topdown)

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

+119 −0
Original line number Diff line number Diff line
@@ -1552,6 +1552,125 @@ static int igt_evict_range(void *ignored) 
	return ret;

}



static unsigned int node_index(const struct drm_mm_node *node)

{

	return div64_u64(node->start, node->size);

}



static int igt_topdown(void *ignored)

{

	const struct insert_mode *topdown = &insert_modes[TOPDOWN];

	DRM_RND_STATE(prng, random_seed);

	const unsigned int count = 8192;

	unsigned int size;

	unsigned long *bitmap = NULL;

	struct drm_mm mm;

	struct drm_mm_node *nodes, *node, *next;

	unsigned int *order, n, m, o = 0;

	int ret;



	/* When allocating top-down, we expect to be returned a node

	 * from a suitable hole at the top of the drm_mm. We check that

	 * the returned node does match the highest available slot.

	 */



	ret = -ENOMEM;

	nodes = vzalloc(count * sizeof(*nodes));

	if (!nodes)

		goto err;



	bitmap = kzalloc(count / BITS_PER_LONG * sizeof(unsigned long),

			 GFP_TEMPORARY);

	if (!bitmap)

		goto err_nodes;



	order = drm_random_order(count, &prng);

	if (!order)

		goto err_bitmap;



	ret = -EINVAL;

	for (size = 1; size <= 64; size <<= 1) {

		drm_mm_init(&mm, 0, size*count);

		for (n = 0; n < count; n++) {

			if (!expect_insert(&mm, &nodes[n],

					   size, 0, n,

					   topdown)) {

				pr_err("insert failed, size %u step %d\n", size, n);

				goto out;

			}



			if (nodes[n].hole_follows) {

				pr_err("hole after topdown insert %d, start=%llx\n, size=%u",

				       n, nodes[n].start, size);

				goto out;

			}



			if (!assert_one_hole(&mm, 0, size*(count - n - 1)))

				goto out;

		}



		if (!assert_continuous(&mm, size))

			goto out;



		drm_random_reorder(order, count, &prng);

		for_each_prime_number_from(n, 1, min(count, max_prime)) {

			for (m = 0; m < n; m++) {

				node = &nodes[order[(o + m) % count]];

				drm_mm_remove_node(node);

				__set_bit(node_index(node), bitmap);

			}



			for (m = 0; m < n; m++) {

				unsigned int last;



				node = &nodes[order[(o + m) % count]];

				if (!expect_insert(&mm, node,

						   size, 0, 0,

						   topdown)) {

					pr_err("insert failed, step %d/%d\n", m, n);

					goto out;

				}



				if (node->hole_follows) {

					pr_err("hole after topdown insert %d/%d, start=%llx\n",

					       m, n, node->start);

					goto out;

				}



				last = find_last_bit(bitmap, count);

				if (node_index(node) != last) {

					pr_err("node %d/%d, size %d, not inserted into upmost hole, expected %d, found %d\n",

					       m, n, size, last, node_index(node));

					goto out;

				}



				__clear_bit(last, bitmap);

			}



			DRM_MM_BUG_ON(find_first_bit(bitmap, count) != count);



			o += n;

		}



		drm_mm_for_each_node_safe(node, next, &mm)

			drm_mm_remove_node(node);

		DRM_MM_BUG_ON(!drm_mm_clean(&mm));

	}



	ret = 0;

out:

	drm_mm_for_each_node_safe(node, next, &mm)

		drm_mm_remove_node(node);

	drm_mm_takedown(&mm);

	kfree(order);

err_bitmap:

	kfree(bitmap);

err_nodes:

	vfree(nodes);

err:

	return ret;

}



#include "drm_selftest.c"



static int __init test_drm_mm_init(void)