Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 757 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tests/drm_buddy_test.c b/drivers/gpu/drm/tests/drm_buddy_test.c
new file mode 100644
index 000000000..a699fc0dc
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_buddy_test.c
@@ -0,0 +1,757 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ * Copyright © 2022 Maíra Canal <mairacanal@riseup.net>
+ */
+
+#include <kunit/test.h>
+
+#include <linux/prime_numbers.h>
+#include <linux/sched/signal.h>
+
+#include <drm/drm_buddy.h>
+
+#include "../lib/drm_random.h"
+
+#define TIMEOUT(name__)								\
+	unsigned long name__ = jiffies + MAX_SCHEDULE_TIMEOUT
+
+static unsigned int random_seed;
+
+static inline u64 get_size(int order, u64 chunk_size)
+{
+	return (1 << order) * chunk_size;
+}
+
+__printf(2, 3)
+static bool __timeout(unsigned long timeout, const char *fmt, ...)
+{
+	va_list va;
+
+	if (!signal_pending(current)) {
+		cond_resched();
+		if (time_before(jiffies, timeout))
+			return false;
+	}
+
+	if (fmt) {
+		va_start(va, fmt);
+		vprintk(fmt, va);
+		va_end(va);
+	}
+
+	return true;
+}
+
+static void __dump_block(struct kunit *test, struct drm_buddy *mm,
+			 struct drm_buddy_block *block, bool buddy)
+{
+	kunit_err(test, "block info: header=%llx, state=%u, order=%d, offset=%llx size=%llx root=%d buddy=%d\n",
+		  block->header, drm_buddy_block_state(block),
+			  drm_buddy_block_order(block), drm_buddy_block_offset(block),
+			  drm_buddy_block_size(mm, block), !block->parent, buddy);
+}
+
+static void dump_block(struct kunit *test, struct drm_buddy *mm,
+		       struct drm_buddy_block *block)
+{
+	struct drm_buddy_block *buddy;
+
+	__dump_block(test, mm, block, false);
+
+	buddy = drm_get_buddy(block);
+	if (buddy)
+		__dump_block(test, mm, buddy, true);
+}
+
+static int check_block(struct kunit *test, struct drm_buddy *mm,
+		       struct drm_buddy_block *block)
+{
+	struct drm_buddy_block *buddy;
+	unsigned int block_state;
+	u64 block_size;
+	u64 offset;
+	int err = 0;
+
+	block_state = drm_buddy_block_state(block);
+
+	if (block_state != DRM_BUDDY_ALLOCATED &&
+	    block_state != DRM_BUDDY_FREE && block_state != DRM_BUDDY_SPLIT) {
+		kunit_err(test, "block state mismatch\n");
+		err = -EINVAL;
+	}
+
+	block_size = drm_buddy_block_size(mm, block);
+	offset = drm_buddy_block_offset(block);
+
+	if (block_size < mm->chunk_size) {
+		kunit_err(test, "block size smaller than min size\n");
+		err = -EINVAL;
+	}
+
+	/* We can't use is_power_of_2() for a u64 on 32-bit systems. */
+	if (block_size & (block_size - 1)) {
+		kunit_err(test, "block size not power of two\n");
+		err = -EINVAL;
+	}
+
+	if (!IS_ALIGNED(block_size, mm->chunk_size)) {
+		kunit_err(test, "block size not aligned to min size\n");
+		err = -EINVAL;
+	}
+
+	if (!IS_ALIGNED(offset, mm->chunk_size)) {
+		kunit_err(test, "block offset not aligned to min size\n");
+		err = -EINVAL;
+	}
+
+	if (!IS_ALIGNED(offset, block_size)) {
+		kunit_err(test, "block offset not aligned to block size\n");
+		err = -EINVAL;
+	}
+
+	buddy = drm_get_buddy(block);
+
+	if (!buddy && block->parent) {
+		kunit_err(test, "buddy has gone fishing\n");
+		err = -EINVAL;
+	}
+
+	if (buddy) {
+		if (drm_buddy_block_offset(buddy) != (offset ^ block_size)) {
+			kunit_err(test, "buddy has wrong offset\n");
+			err = -EINVAL;
+		}
+
+		if (drm_buddy_block_size(mm, buddy) != block_size) {
+			kunit_err(test, "buddy size mismatch\n");
+			err = -EINVAL;
+		}
+
+		if (drm_buddy_block_state(buddy) == block_state &&
+		    block_state == DRM_BUDDY_FREE) {
+			kunit_err(test, "block and its buddy are free\n");
+			err = -EINVAL;
+		}
+	}
+
+	return err;
+}
+
+static int check_blocks(struct kunit *test, struct drm_buddy *mm,
+			struct list_head *blocks, u64 expected_size, bool is_contiguous)
+{
+	struct drm_buddy_block *block;
+	struct drm_buddy_block *prev;
+	u64 total;
+	int err = 0;
+
+	block = NULL;
+	prev = NULL;
+	total = 0;
+
+	list_for_each_entry(block, blocks, link) {
+		err = check_block(test, mm, block);
+
+		if (!drm_buddy_block_is_allocated(block)) {
+			kunit_err(test, "block not allocated\n");
+			err = -EINVAL;
+		}
+
+		if (is_contiguous && prev) {
+			u64 prev_block_size;
+			u64 prev_offset;
+			u64 offset;
+
+			prev_offset = drm_buddy_block_offset(prev);
+			prev_block_size = drm_buddy_block_size(mm, prev);
+			offset = drm_buddy_block_offset(block);
+
+			if (offset != (prev_offset + prev_block_size)) {
+				kunit_err(test, "block offset mismatch\n");
+				err = -EINVAL;
+			}
+		}
+
+		if (err)
+			break;
+
+		total += drm_buddy_block_size(mm, block);
+		prev = block;
+	}
+
+	if (!err) {
+		if (total != expected_size) {
+			kunit_err(test, "size mismatch, expected=%llx, found=%llx\n",
+				  expected_size, total);
+			err = -EINVAL;
+		}
+		return err;
+	}
+
+	if (prev) {
+		kunit_err(test, "prev block, dump:\n");
+		dump_block(test, mm, prev);
+	}
+
+	kunit_err(test, "bad block, dump:\n");
+	dump_block(test, mm, block);
+
+	return err;
+}
+
+static int check_mm(struct kunit *test, struct drm_buddy *mm)
+{
+	struct drm_buddy_block *root;
+	struct drm_buddy_block *prev;
+	unsigned int i;
+	u64 total;
+	int err = 0;
+
+	if (!mm->n_roots) {
+		kunit_err(test, "n_roots is zero\n");
+		return -EINVAL;
+	}
+
+	if (mm->n_roots != hweight64(mm->size)) {
+		kunit_err(test, "n_roots mismatch, n_roots=%u, expected=%lu\n",
+			  mm->n_roots, hweight64(mm->size));
+		return -EINVAL;
+	}
+
+	root = NULL;
+	prev = NULL;
+	total = 0;
+
+	for (i = 0; i < mm->n_roots; ++i) {
+		struct drm_buddy_block *block;
+		unsigned int order;
+
+		root = mm->roots[i];
+		if (!root) {
+			kunit_err(test, "root(%u) is NULL\n", i);
+			err = -EINVAL;
+			break;
+		}
+
+		err = check_block(test, mm, root);
+
+		if (!drm_buddy_block_is_free(root)) {
+			kunit_err(test, "root not free\n");
+			err = -EINVAL;
+		}
+
+		order = drm_buddy_block_order(root);
+
+		if (!i) {
+			if (order != mm->max_order) {
+				kunit_err(test, "max order root missing\n");
+				err = -EINVAL;
+			}
+		}
+
+		if (prev) {
+			u64 prev_block_size;
+			u64 prev_offset;
+			u64 offset;
+
+			prev_offset = drm_buddy_block_offset(prev);
+			prev_block_size = drm_buddy_block_size(mm, prev);
+			offset = drm_buddy_block_offset(root);
+
+			if (offset != (prev_offset + prev_block_size)) {
+				kunit_err(test, "root offset mismatch\n");
+				err = -EINVAL;
+			}
+		}
+
+		block = list_first_entry_or_null(&mm->free_list[order],
+						 struct drm_buddy_block, link);
+		if (block != root) {
+			kunit_err(test, "root mismatch at order=%u\n", order);
+			err = -EINVAL;
+		}
+
+		if (err)
+			break;
+
+		prev = root;
+		total += drm_buddy_block_size(mm, root);
+	}
+
+	if (!err) {
+		if (total != mm->size) {
+			kunit_err(test, "expected mm size=%llx, found=%llx\n",
+				  mm->size, total);
+			err = -EINVAL;
+		}
+		return err;
+	}
+
+	if (prev) {
+		kunit_err(test, "prev root(%u), dump:\n", i - 1);
+		dump_block(test, mm, prev);
+	}
+
+	if (root) {
+		kunit_err(test, "bad root(%u), dump:\n", i);
+		dump_block(test, mm, root);
+	}
+
+	return err;
+}
+
+static void mm_config(u64 *size, u64 *chunk_size)
+{
+	DRM_RND_STATE(prng, random_seed);
+	u32 s, ms;
+
+	/* Nothing fancy, just try to get an interesting bit pattern */
+
+	prandom_seed_state(&prng, random_seed);
+
+	/* Let size be a random number of pages up to 8 GB (2M pages) */
+	s = 1 + drm_prandom_u32_max_state((BIT(33 - 12)) - 1, &prng);
+	/* Let the chunk size be a random power of 2 less than size */
+	ms = BIT(drm_prandom_u32_max_state(ilog2(s), &prng));
+	/* Round size down to the chunk size */
+	s &= -ms;
+
+	/* Convert from pages to bytes */
+	*chunk_size = (u64)ms << 12;
+	*size = (u64)s << 12;
+}
+
+static void drm_test_buddy_alloc_pathological(struct kunit *test)
+{
+	u64 mm_size, size, start = 0;
+	struct drm_buddy_block *block;
+	const int max_order = 3;
+	unsigned long flags = 0;
+	int order, top;
+	struct drm_buddy mm;
+	LIST_HEAD(blocks);
+	LIST_HEAD(holes);
+	LIST_HEAD(tmp);
+
+	/*
+	 * Create a pot-sized mm, then allocate one of each possible
+	 * order within. This should leave the mm with exactly one
+	 * page left. Free the largest block, then whittle down again.
+	 * Eventually we will have a fully 50% fragmented mm.
+	 */
+
+	mm_size = PAGE_SIZE << max_order;
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
+			       "buddy_init failed\n");
+
+	KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
+
+	for (top = max_order; top; top--) {
+		/* Make room by freeing the largest allocated block */
+		block = list_first_entry_or_null(&blocks, typeof(*block), link);
+		if (block) {
+			list_del(&block->link);
+			drm_buddy_free_block(&mm, block);
+		}
+
+		for (order = top; order--;) {
+			size = get_size(order, PAGE_SIZE);
+			KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start,
+									    mm_size, size, size,
+										&tmp, flags),
+					"buddy_alloc hit -ENOMEM with order=%d, top=%d\n",
+					order, top);
+
+			block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+			KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+			list_move_tail(&block->link, &blocks);
+		}
+
+		/* There should be one final page for this sub-allocation */
+		size = get_size(0, PAGE_SIZE);
+		KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								    size, size, &tmp, flags),
+							   "buddy_alloc hit -ENOMEM for hole\n");
+
+		block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+		KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+		list_move_tail(&block->link, &holes);
+
+		size = get_size(top, PAGE_SIZE);
+		KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								   size, size, &tmp, flags),
+							  "buddy_alloc unexpectedly succeeded at top-order %d/%d, it should be full!",
+							  top, max_order);
+	}
+
+	drm_buddy_free_list(&mm, &holes);
+
+	/* Nothing larger than blocks of chunk_size now available */
+	for (order = 1; order <= max_order; order++) {
+		size = get_size(order, PAGE_SIZE);
+		KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								   size, size, &tmp, flags),
+							  "buddy_alloc unexpectedly succeeded at order %d, it should be full!",
+							  order);
+	}
+
+	list_splice_tail(&holes, &blocks);
+	drm_buddy_free_list(&mm, &blocks);
+	drm_buddy_fini(&mm);
+}
+
+static void drm_test_buddy_alloc_smoke(struct kunit *test)
+{
+	u64 mm_size, chunk_size, start = 0;
+	unsigned long flags = 0;
+	struct drm_buddy mm;
+	int *order;
+	int i;
+
+	DRM_RND_STATE(prng, random_seed);
+	TIMEOUT(end_time);
+
+	mm_config(&mm_size, &chunk_size);
+
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, chunk_size),
+			       "buddy_init failed\n");
+
+	order = drm_random_order(mm.max_order + 1, &prng);
+	KUNIT_ASSERT_TRUE(test, order);
+
+	for (i = 0; i <= mm.max_order; ++i) {
+		struct drm_buddy_block *block;
+		int max_order = order[i];
+		bool timeout = false;
+		LIST_HEAD(blocks);
+		u64 total, size;
+		LIST_HEAD(tmp);
+		int order, err;
+
+		KUNIT_ASSERT_FALSE_MSG(test, check_mm(test, &mm),
+				       "pre-mm check failed, abort\n");
+
+		order = max_order;
+		total = 0;
+
+		do {
+retry:
+			size = get_size(order, chunk_size);
+			err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, size, &tmp, flags);
+			if (err) {
+				if (err == -ENOMEM) {
+					KUNIT_FAIL(test, "buddy_alloc hit -ENOMEM with order=%d\n",
+						   order);
+				} else {
+					if (order--) {
+						err = 0;
+						goto retry;
+					}
+
+					KUNIT_FAIL(test, "buddy_alloc with order=%d failed\n",
+						   order);
+				}
+
+				break;
+			}
+
+			block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+			KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+			list_move_tail(&block->link, &blocks);
+			KUNIT_EXPECT_EQ_MSG(test, drm_buddy_block_order(block), order,
+					    "buddy_alloc order mismatch\n");
+
+			total += drm_buddy_block_size(&mm, block);
+
+			if (__timeout(end_time, NULL)) {
+				timeout = true;
+				break;
+			}
+		} while (total < mm.size);
+
+		if (!err)
+			err = check_blocks(test, &mm, &blocks, total, false);
+
+		drm_buddy_free_list(&mm, &blocks);
+
+		if (!err) {
+			KUNIT_EXPECT_FALSE_MSG(test, check_mm(test, &mm),
+					       "post-mm check failed\n");
+		}
+
+		if (err || timeout)
+			break;
+
+		cond_resched();
+	}
+
+	kfree(order);
+	drm_buddy_fini(&mm);
+}
+
+static void drm_test_buddy_alloc_pessimistic(struct kunit *test)
+{
+	u64 mm_size, size, start = 0;
+	struct drm_buddy_block *block, *bn;
+	const unsigned int max_order = 16;
+	unsigned long flags = 0;
+	struct drm_buddy mm;
+	unsigned int order;
+	LIST_HEAD(blocks);
+	LIST_HEAD(tmp);
+
+	/*
+	 * Create a pot-sized mm, then allocate one of each possible
+	 * order within. This should leave the mm with exactly one
+	 * page left.
+	 */
+
+	mm_size = PAGE_SIZE << max_order;
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
+			       "buddy_init failed\n");
+
+	KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
+
+	for (order = 0; order < max_order; order++) {
+		size = get_size(order, PAGE_SIZE);
+		KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								    size, size, &tmp, flags),
+							   "buddy_alloc hit -ENOMEM with order=%d\n",
+							   order);
+
+		block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+		KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+		list_move_tail(&block->link, &blocks);
+	}
+
+	/* And now the last remaining block available */
+	size = get_size(0, PAGE_SIZE);
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+							    size, size, &tmp, flags),
+						   "buddy_alloc hit -ENOMEM on final alloc\n");
+
+	block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+	KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+	list_move_tail(&block->link, &blocks);
+
+	/* Should be completely full! */
+	for (order = max_order; order--;) {
+		size = get_size(order, PAGE_SIZE);
+		KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								   size, size, &tmp, flags),
+							  "buddy_alloc unexpectedly succeeded, it should be full!");
+	}
+
+	block = list_last_entry(&blocks, typeof(*block), link);
+	list_del(&block->link);
+	drm_buddy_free_block(&mm, block);
+
+	/* As we free in increasing size, we make available larger blocks */
+	order = 1;
+	list_for_each_entry_safe(block, bn, &blocks, link) {
+		list_del(&block->link);
+		drm_buddy_free_block(&mm, block);
+
+		size = get_size(order, PAGE_SIZE);
+		KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								    size, size, &tmp, flags),
+							   "buddy_alloc hit -ENOMEM with order=%d\n",
+							   order);
+
+		block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+		KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+		list_del(&block->link);
+		drm_buddy_free_block(&mm, block);
+		order++;
+	}
+
+	/* To confirm, now the whole mm should be available */
+	size = get_size(max_order, PAGE_SIZE);
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+							    size, size, &tmp, flags),
+						   "buddy_alloc (realloc) hit -ENOMEM with order=%d\n",
+						   max_order);
+
+	block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+	KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+	list_del(&block->link);
+	drm_buddy_free_block(&mm, block);
+	drm_buddy_free_list(&mm, &blocks);
+	drm_buddy_fini(&mm);
+}
+
+static void drm_test_buddy_alloc_optimistic(struct kunit *test)
+{
+	u64 mm_size, 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;
+
+	/*
+	 * 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);
+
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
+			       "buddy_init failed\n");
+
+	KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
+
+	for (order = 0; order <= max_order; order++) {
+		size = get_size(order, PAGE_SIZE);
+		KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+								    size, size, &tmp, flags),
+							   "buddy_alloc hit -ENOMEM with order=%d\n",
+							   order);
+
+		block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+		KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+		list_move_tail(&block->link, &blocks);
+	}
+
+	/* Should be completely full! */
+	size = get_size(0, PAGE_SIZE);
+	KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+							   size, size, &tmp, flags),
+						  "buddy_alloc unexpectedly succeeded, it should be full!");
+
+	drm_buddy_free_list(&mm, &blocks);
+	drm_buddy_fini(&mm);
+}
+
+static void drm_test_buddy_alloc_range(struct kunit *test)
+{
+	unsigned long flags = DRM_BUDDY_RANGE_ALLOCATION;
+	u64 offset, size, rem, chunk_size, end;
+	unsigned long page_num;
+	struct drm_buddy mm;
+	LIST_HEAD(blocks);
+
+	mm_config(&size, &chunk_size);
+
+	KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, size, chunk_size),
+			       "buddy_init failed");
+
+	KUNIT_ASSERT_FALSE_MSG(test, check_mm(test, &mm),
+			       "pre-mm check failed, abort!");
+
+	rem = mm.size;
+	offset = 0;
+
+	for_each_prime_number_from(page_num, 1, ULONG_MAX - 1) {
+		struct drm_buddy_block *block;
+		LIST_HEAD(tmp);
+
+		size = min(page_num * mm.chunk_size, rem);
+		end = offset + size;
+
+		KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, offset, end,
+								    size, mm.chunk_size,
+									&tmp, flags),
+				"alloc_range with offset=%llx, size=%llx failed\n", offset, size);
+
+		block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+		KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_range has no blocks\n");
+
+		KUNIT_ASSERT_EQ_MSG(test, drm_buddy_block_offset(block), offset,
+				    "alloc_range start offset mismatch, found=%llx, expected=%llx\n",
+							drm_buddy_block_offset(block), offset);
+
+		KUNIT_ASSERT_FALSE(test, check_blocks(test, &mm, &tmp, size, true));
+
+		list_splice_tail(&tmp, &blocks);
+
+		offset += size;
+
+		rem -= size;
+		if (!rem)
+			break;
+
+		cond_resched();
+	}
+
+	drm_buddy_free_list(&mm, &blocks);
+
+	KUNIT_EXPECT_FALSE_MSG(test, check_mm(test, &mm), "post-mm check failed\n");
+
+	drm_buddy_fini(&mm);
+}
+
+static void drm_test_buddy_alloc_limit(struct kunit *test)
+{
+	u64 size = U64_MAX, start = 0;
+	struct drm_buddy_block *block;
+	unsigned long flags = 0;
+	LIST_HEAD(allocated);
+	struct drm_buddy mm;
+
+	KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, size, PAGE_SIZE));
+
+	KUNIT_EXPECT_EQ_MSG(test, mm.max_order, DRM_BUDDY_MAX_ORDER,
+			    "mm.max_order(%d) != %d\n", mm.max_order,
+						DRM_BUDDY_MAX_ORDER);
+
+	size = mm.chunk_size << mm.max_order;
+	KUNIT_EXPECT_FALSE(test, drm_buddy_alloc_blocks(&mm, start, size, size,
+							PAGE_SIZE, &allocated, flags));
+
+	block = list_first_entry_or_null(&allocated, struct drm_buddy_block, link);
+	KUNIT_EXPECT_TRUE(test, block);
+
+	KUNIT_EXPECT_EQ_MSG(test, drm_buddy_block_order(block), mm.max_order,
+			    "block order(%d) != %d\n",
+						drm_buddy_block_order(block), mm.max_order);
+
+	KUNIT_EXPECT_EQ_MSG(test, drm_buddy_block_size(&mm, block),
+			    BIT_ULL(mm.max_order) * PAGE_SIZE,
+						"block size(%llu) != %llu\n",
+						drm_buddy_block_size(&mm, block),
+						BIT_ULL(mm.max_order) * PAGE_SIZE);
+
+	drm_buddy_free_list(&mm, &allocated);
+	drm_buddy_fini(&mm);
+}
+
+static int drm_buddy_init_test(struct kunit *test)
+{
+	while (!random_seed)
+		random_seed = get_random_u32();
+
+	return 0;
+}
+
+static struct kunit_case drm_buddy_tests[] = {
+	KUNIT_CASE(drm_test_buddy_alloc_limit),
+	KUNIT_CASE(drm_test_buddy_alloc_range),
+	KUNIT_CASE(drm_test_buddy_alloc_optimistic),
+	KUNIT_CASE(drm_test_buddy_alloc_pessimistic),
+	KUNIT_CASE(drm_test_buddy_alloc_smoke),
+	KUNIT_CASE(drm_test_buddy_alloc_pathological),
+	{}
+};
+
+static struct kunit_suite drm_buddy_test_suite = {
+	.name = "drm_buddy",
+	.init = drm_buddy_init_test,
+	.test_cases = drm_buddy_tests,
+};
+
+kunit_test_suite(drm_buddy_test_suite);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");