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linux-stable/drivers/gpu/drm/tests/drm_buddy_test.c

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// 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;
}
if (!is_power_of_2(block_size)) {
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");
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