// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
* Copyright © 2022 Maíra Canal <[email protected]>
*/
#include <kunit/test.h>
#include <linux/prime_numbers.h>
#include <linux/sched/signal.h>
#include <linux/sizes.h>
#include <drm/drm_buddy.h>
#include "../lib/drm_random.h"
static unsigned int random_seed;
static inline u64 get_size(int order, u64 chunk_size)
{
return (1 << order) * chunk_size;
}
static void drm_test_buddy_alloc_range_bias(struct kunit *test)
{
u32 mm_size, size, ps, bias_size, bias_start, bias_end, bias_rem;
DRM_RND_STATE(prng, random_seed);
unsigned int i, count, *order;
struct drm_buddy_block *block;
unsigned long flags;
struct drm_buddy mm;
LIST_HEAD(allocated);
bias_size = SZ_1M;
ps = roundup_pow_of_two(prandom_u32_state(&prng) % bias_size);
ps = max(SZ_4K, ps);
mm_size = (SZ_8M-1) & ~(ps-1); /* Multiple roots */
kunit_info(test, "mm_size=%u, ps=%u\n", mm_size, ps);
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, ps),
"buddy_init failed\n");
count = mm_size / bias_size;
order = drm_random_order(count, &prng);
KUNIT_EXPECT_TRUE(test, order);
/*
* Idea is to split the address space into uniform bias ranges, and then
* in some random order allocate within each bias, using various
* patterns within. This should detect if allocations leak out from a
* given bias, for example.
*/
for (i = 0; i < count; i++) {
LIST_HEAD(tmp);
u32 size;
bias_start = order[i] * bias_size;
bias_end = bias_start + bias_size;
bias_rem = bias_size;
/* internal round_up too big */
KUNIT_ASSERT_TRUE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, bias_size + ps, bias_size,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, bias_size, bias_size);
/* size too big */
KUNIT_ASSERT_TRUE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, bias_size + ps, ps,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc didn't fail with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, bias_size + ps, ps);
/* bias range too small for size */
KUNIT_ASSERT_TRUE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start + ps,
bias_end, bias_size, ps,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc didn't fail with bias(%x-%x), size=%u, ps=%u\n",
bias_start + ps, bias_end, bias_size, ps);
/* bias misaligned */
KUNIT_ASSERT_TRUE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start + ps,
bias_end - ps,
bias_size >> 1, bias_size >> 1,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc h didn't fail with bias(%x-%x), size=%u, ps=%u\n",
bias_start + ps, bias_end - ps, bias_size >> 1, bias_size >> 1);
/* single big page */
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, bias_size, bias_size,
&tmp,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc i failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, bias_size, bias_size);
drm_buddy_free_list(&mm, &tmp, 0);
/* single page with internal round_up */
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, ps, bias_size,
&tmp,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, ps, bias_size);
drm_buddy_free_list(&mm, &tmp, 0);
/* random size within */
size = max(round_up(prandom_u32_state(&prng) % bias_rem, ps), ps);
if (size)
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, size, ps,
&tmp,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, size, ps);
bias_rem -= size;
/* too big for current avail */
KUNIT_ASSERT_TRUE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, bias_rem + ps, ps,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc didn't fail with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, bias_rem + ps, ps);
if (bias_rem) {
/* random fill of the remainder */
size = max(round_up(prandom_u32_state(&prng) % bias_rem, ps), ps);
size = max(size, ps);
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, size, ps,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, size, ps);
/*
* Intentionally allow some space to be left
* unallocated, and ideally not always on the bias
* boundaries.
*/
drm_buddy_free_list(&mm, &tmp, 0);
} else {
list_splice_tail(&tmp, &allocated);
}
}
kfree(order);
drm_buddy_free_list(&mm, &allocated, 0);
drm_buddy_fini(&mm);
/*
* Something more free-form. Idea is to pick a random starting bias
* range within the address space and then start filling it up. Also
* randomly grow the bias range in both directions as we go along. This
* should give us bias start/end which is not always uniform like above,
* and in some cases will require the allocator to jump over already
* allocated nodes in the middle of the address space.
*/
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, ps),
"buddy_init failed\n");
bias_start = round_up(prandom_u32_state(&prng) % (mm_size - ps), ps);
bias_end = round_up(bias_start + prandom_u32_state(&prng) % (mm_size - bias_start), ps);
bias_end = max(bias_end, bias_start + ps);
bias_rem = bias_end - bias_start;
do {
u32 size = max(round_up(prandom_u32_state(&prng) % bias_rem, ps), ps);
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, size, ps,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, size, ps);
bias_rem -= size;
/*
* Try to randomly grow the bias range in both directions, or
* only one, or perhaps don't grow at all.
*/
do {
u32 old_bias_start = bias_start;
u32 old_bias_end = bias_end;
if (bias_start)
bias_start -= round_up(prandom_u32_state(&prng) % bias_start, ps);
if (bias_end != mm_size)
bias_end += round_up(prandom_u32_state(&prng) % (mm_size - bias_end), ps);
bias_rem += old_bias_start - bias_start;
bias_rem += bias_end - old_bias_end;
} while (!bias_rem && (bias_start || bias_end != mm_size));
} while (bias_rem);
KUNIT_ASSERT_EQ(test, bias_start, 0);
KUNIT_ASSERT_EQ(test, bias_end, mm_size);
KUNIT_ASSERT_TRUE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start, bias_end,
ps, ps,
&allocated,
DRM_BUDDY_RANGE_ALLOCATION),
"buddy_alloc passed with bias(%x-%x), size=%u\n",
bias_start, bias_end, ps);
drm_buddy_free_list(&mm, &allocated, 0);
drm_buddy_fini(&mm);
/*
* Allocate cleared blocks in the bias range when the DRM buddy's clear avail is
* zero. This will validate the bias range allocation in scenarios like system boot
* when no cleared blocks are available and exercise the fallback path too. The resulting
* blocks should always be dirty.
*/
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, ps),
"buddy_init failed\n");
bias_start = round_up(prandom_u32_state(&prng) % (mm_size - ps), ps);
bias_end = round_up(bias_start + prandom_u32_state(&prng) % (mm_size - bias_start), ps);
bias_end = max(bias_end, bias_start + ps);
bias_rem = bias_end - bias_start;
flags = DRM_BUDDY_CLEAR_ALLOCATION | DRM_BUDDY_RANGE_ALLOCATION;
size = max(round_up(prandom_u32_state(&prng) % bias_rem, ps), ps);
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, bias_start,
bias_end, size, ps,
&allocated,
flags),
"buddy_alloc failed with bias(%x-%x), size=%u, ps=%u\n",
bias_start, bias_end, size, ps);
list_for_each_entry(block, &allocated, link)
KUNIT_EXPECT_EQ(test, drm_buddy_block_is_clear(block), false);
drm_buddy_free_list(&mm, &allocated, 0);
drm_buddy_fini(&mm);
}
static void drm_test_buddy_alloc_clear(struct kunit *test)
{
unsigned long n_pages, total, i = 0;
DRM_RND_STATE(prng, random_seed);
const unsigned long ps = SZ_4K;
struct drm_buddy_block *block;
const int max_order = 12;
LIST_HEAD(allocated);
struct drm_buddy mm;
unsigned int order;
u32 mm_size, size;
LIST_HEAD(dirty);
LIST_HEAD(clean);
mm_size = SZ_4K << max_order;
KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, mm_size, ps));
KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
/*
* Idea is to allocate and free some random portion of the address space,
* returning those pages as non-dirty and randomly alternate between
* requesting dirty and non-dirty pages (not going over the limit
* we freed as non-dirty), putting that into two separate lists.
* Loop over both lists at the end checking that the dirty list
* is indeed all dirty pages and vice versa. Free it all again,
* keeping the dirty/clear status.
*/
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
5 * ps, ps, &allocated,
DRM_BUDDY_TOPDOWN_ALLOCATION),
"buddy_alloc hit an error size=%lu\n", 5 * ps);
drm_buddy_free_list(&mm, &allocated, DRM_BUDDY_CLEARED);
n_pages = 10;
do {
unsigned long flags;
struct list_head *list;
int slot = i % 2;
if (slot == 0) {
list = &dirty;
flags = 0;
} else {
list = &clean;
flags = DRM_BUDDY_CLEAR_ALLOCATION;
}
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
ps, ps, list,
flags),
"buddy_alloc hit an error size=%lu\n", ps);
} while (++i < n_pages);
list_for_each_entry(block, &clean, link)
KUNIT_EXPECT_EQ(test, drm_buddy_block_is_clear(block), true);
list_for_each_entry(block, &dirty, link)
KUNIT_EXPECT_EQ(test, drm_buddy_block_is_clear(block), false);
drm_buddy_free_list(&mm, &clean, DRM_BUDDY_CLEARED);
/*
* Trying to go over the clear limit for some allocation.
* The allocation should never fail with reasonable page-size.
*/
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
10 * ps, ps, &clean,
DRM_BUDDY_CLEAR_ALLOCATION),
"buddy_alloc hit an error size=%lu\n", 10 * ps);
drm_buddy_free_list(&mm, &clean, DRM_BUDDY_CLEARED);
drm_buddy_free_list(&mm, &dirty, 0);
drm_buddy_fini(&mm);
KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, mm_size, ps));
/*
* Create a new mm. Intentionally fragment the address space by creating
* two alternating lists. Free both lists, one as dirty the other as clean.
* Try to allocate double the previous size with matching min_page_size. The
* allocation should never fail as it calls the force_merge. Also check that
* the page is always dirty after force_merge. Free the page as dirty, then
* repeat the whole thing, increment the order until we hit the max_order.
*/
i = 0;
n_pages = mm_size / ps;
do {
struct list_head *list;
int slot = i % 2;
if (slot == 0)
list = &dirty;
else
list = &clean;
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
ps, ps, list, 0),
"buddy_alloc hit an error size=%lu\n", ps);
} while (++i < n_pages);
drm_buddy_free_list(&mm, &clean, DRM_BUDDY_CLEARED);
drm_buddy_free_list(&mm, &dirty, 0);
order = 1;
do {
size = SZ_4K << order;
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
size, size, &allocated,
DRM_BUDDY_CLEAR_ALLOCATION),
"buddy_alloc hit an error size=%u\n", size);
total = 0;
list_for_each_entry(block, &allocated, link) {
if (size != mm_size)
KUNIT_EXPECT_EQ(test, drm_buddy_block_is_clear(block), false);
total += drm_buddy_block_size(&mm, block);
}
KUNIT_EXPECT_EQ(test, total, size);
drm_buddy_free_list(&mm, &allocated, 0);
} while (++order <= max_order);
drm_buddy_fini(&mm);
/*
* Create a new mm with a non power-of-two size. Allocate a random size, free as
* cleared and then call fini. This will ensure the multi-root force merge during
* fini.
*/
mm_size = 12 * SZ_4K;
size = max(round_up(prandom_u32_state(&prng) % mm_size, ps), ps);
KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, mm_size, ps));
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
size, ps, &allocated,
DRM_BUDDY_TOPDOWN_ALLOCATION),
"buddy_alloc hit an error size=%u\n", size);
drm_buddy_free_list(&mm, &allocated, DRM_BUDDY_CLEARED);
drm_buddy_fini(&mm);
}
static void drm_test_buddy_alloc_contiguous(struct kunit *test)
{
const unsigned long ps = SZ_4K, mm_size = 16 * 3 * SZ_4K;
unsigned long i, n_pages, total;
struct drm_buddy_block *block;
struct drm_buddy mm;
LIST_HEAD(left);
LIST_HEAD(middle);
LIST_HEAD(right);
LIST_HEAD(allocated);
KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, mm_size, ps));
/*
* Idea is to fragment the address space by alternating block
* allocations between three different lists; one for left, middle and
* right. We can then free a list to simulate fragmentation. In
* particular we want to exercise the DRM_BUDDY_CONTIGUOUS_ALLOCATION,
* including the try_harder path.
*/
i = 0;
n_pages = mm_size / ps;
do {
struct list_head *list;
int slot = i % 3;
if (slot == 0)
list = &left;
else if (slot == 1)
list = &middle;
else
list = &right;
KUNIT_ASSERT_FALSE_MSG(test,
drm_buddy_alloc_blocks(&mm, 0, mm_size,
ps, ps, list, 0),
"buddy_alloc hit an error size=%lu\n",
ps);
} while (++i < n_pages);
KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
3 * ps, ps, &allocated,
DRM_BUDDY_CONTIGUOUS_ALLOCATION),
"buddy_alloc didn't error size=%lu\n", 3 * ps);
drm_buddy_free_list(&mm, &middle, 0);
KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
3 * ps, ps, &allocated,
DRM_BUDDY_CONTIGUOUS_ALLOCATION),
"buddy_alloc didn't error size=%lu\n", 3 * ps);
KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
2 * ps, ps, &allocated,
DRM_BUDDY_CONTIGUOUS_ALLOCATION),
"buddy_alloc didn't error size=%lu\n", 2 * ps);
drm_buddy_free_list(&mm, &right, 0);
KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
3 * ps, ps, &allocated,
DRM_BUDDY_CONTIGUOUS_ALLOCATION),
"buddy_alloc didn't error size=%lu\n", 3 * ps);
/*
* At this point we should have enough contiguous space for 2 blocks,
* however they are never buddies (since we freed middle and right) so
* will require the try_harder logic to find them.
*/
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
2 * ps, ps, &allocated,
DRM_BUDDY_CONTIGUOUS_ALLOCATION),
"buddy_alloc hit an error size=%lu\n", 2 * ps);
drm_buddy_free_list(&mm, &left, 0);
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, 0, mm_size,
3 * ps, ps, &allocated,
DRM_BUDDY_CONTIGUOUS_ALLOCATION),
"buddy_alloc hit an error size=%lu\n", 3 * ps);
total = 0;
list_for_each_entry(block, &allocated, link)
total += drm_buddy_block_size(&mm, block);
KUNIT_ASSERT_EQ(test, total, ps * 2 + ps * 3);
drm_buddy_free_list(&mm, &allocated, 0);
drm_buddy_fini(&mm);
}
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 = SZ_4K << max_order;
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, SZ_4K),
"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, mm.chunk_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, mm.chunk_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, mm.chunk_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, 0);
/* Nothing larger than blocks of chunk_size now available */
for (order = 1; order <= max_order; order++) {
size = get_size(order, mm.chunk_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, 0);
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 = SZ_4K << max_order;
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, SZ_4K),
"buddy_init failed\n");
KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
for (order = 0; order < max_order; order++) {
size = get_size(order, mm.chunk_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, mm.chunk_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, mm.chunk_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, mm.chunk_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, mm.chunk_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, 0);
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 = SZ_4K * ((1 << (max_order + 1)) - 1);
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, SZ_4K),
"buddy_init failed\n");
KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
for (order = 0; order <= max_order; order++) {
size = get_size(order, mm.chunk_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, mm.chunk_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, 0);
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, SZ_4K));
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,
mm.chunk_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) * mm.chunk_size,
"block size(%llu) != %llu\n",
drm_buddy_block_size(&mm, block),
BIT_ULL(mm.max_order) * mm.chunk_size);
drm_buddy_free_list(&mm, &allocated, 0);
drm_buddy_fini(&mm);
}
static int drm_buddy_suite_init(struct kunit_suite *suite)
{
while (!random_seed)
random_seed = get_random_u32();
kunit_info(suite, "Testing DRM buddy manager, with random_seed=0x%x\n",
random_seed);
return 0;
}
static struct kunit_case drm_buddy_tests[] = {
KUNIT_CASE(drm_test_buddy_alloc_limit),
KUNIT_CASE(drm_test_buddy_alloc_optimistic),
KUNIT_CASE(drm_test_buddy_alloc_pessimistic),
KUNIT_CASE(drm_test_buddy_alloc_pathological),
KUNIT_CASE(drm_test_buddy_alloc_contiguous),
KUNIT_CASE(drm_test_buddy_alloc_clear),
KUNIT_CASE(drm_test_buddy_alloc_range_bias),
{}
};
static struct kunit_suite drm_buddy_test_suite = {
.name = "drm_buddy",
.suite_init = drm_buddy_suite_init,
.test_cases = drm_buddy_tests,
};
kunit_test_suite(drm_buddy_test_suite);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Kunit test for drm_buddy functions");
MODULE_LICENSE("GPL");
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