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Short summary of fixes pull:

Browse Source 
buddy:
 - stop using PAGE_SIZE
 
 shmem-helper:
 - avoid kernel panic in mmap()
 
 tests:
 - buddy: fix PAGE_SIZE dependency
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Merge tag 'drm-misc-fixes-2024-05-23' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-fixes

Short summary of fixes pull:

buddy:
- stop using PAGE_SIZE

shmem-helper:
- avoid kernel panic in mmap()

tests:
- buddy: fix PAGE_SIZE dependency

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240523184745.GA11363@localhost.localdomain
This commit is contained in:
Dave Airlie 2024-05-27 13:46:37 +10:00
commit 3e049b6b8f
4 changed files with 28 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/drm_buddy.c
View File

@ -239,7 +239,7 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size)
if (size < chunk_size)
return -EINVAL;
if (chunk_size < PAGE_SIZE)
if (chunk_size < SZ_4K)
return -EINVAL;
if (!is_power_of_2(chunk_size))

3
drivers/gpu/drm/drm_gem_shmem_helper.c
View File

@ -611,6 +611,9 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct
return ret;
}
if (is_cow_mapping(vma->vm_flags))
return -EINVAL;
dma_resv_lock(shmem->base.resv, NULL);
ret = drm_gem_shmem_get_pages(shmem);
dma_resv_unlock(shmem->base.resv);

42
drivers/gpu/drm/tests/drm_buddy_test.c
View File

@ -505,8 +505,8 @@ static void drm_test_buddy_alloc_pathological(struct kunit *test)
* 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),
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);
@ -520,7 +520,7 @@ static void drm_test_buddy_alloc_pathological(struct kunit *test)
}
for (order = top; order--;) {
size = get_size(order, PAGE_SIZE);
size = get_size(order, mm.chunk_size);
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start,
mm_size, size, size,
&tmp, flags),
@ -534,7 +534,7 @@ static void drm_test_buddy_alloc_pathological(struct kunit *test)
}
/* There should be one final page for this sub-allocation */
size = get_size(0, PAGE_SIZE);
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");
@ -544,7 +544,7 @@ static void drm_test_buddy_alloc_pathological(struct kunit *test)
list_move_tail(&block->link, &holes);
size = get_size(top, PAGE_SIZE);
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!",
@ -555,7 +555,7 @@ static void drm_test_buddy_alloc_pathological(struct kunit *test)
/* Nothing larger than blocks of chunk_size now available */
for (order = 1; order <= max_order; order++) {
size = get_size(order, PAGE_SIZE);
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!",
@ -584,14 +584,14 @@ static void drm_test_buddy_alloc_pessimistic(struct kunit *test)
* page left.
*/
mm_size = PAGE_SIZE << max_order;
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
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, PAGE_SIZE);
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",
@ -604,7 +604,7 @@ static void drm_test_buddy_alloc_pessimistic(struct kunit *test)
}
/* And now the last remaining block available */
size = get_size(0, PAGE_SIZE);
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");
@ -616,7 +616,7 @@ static void drm_test_buddy_alloc_pessimistic(struct kunit *test)
/* Should be completely full! */
for (order = max_order; order--;) {
size = get_size(order, PAGE_SIZE);
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!");
@ -632,7 +632,7 @@ static void drm_test_buddy_alloc_pessimistic(struct kunit *test)
list_del(&block->link);
drm_buddy_free_block(&mm, block);
size = get_size(order, PAGE_SIZE);
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",
@ -647,7 +647,7 @@ static void drm_test_buddy_alloc_pessimistic(struct kunit *test)
}
/* To confirm, now the whole mm should be available */
size = get_size(max_order, PAGE_SIZE);
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",
@ -678,15 +678,15 @@ static void drm_test_buddy_alloc_optimistic(struct kunit *test)
* try to allocate them all.
*/
mm_size = PAGE_SIZE * ((1 << (max_order + 1)) - 1);
mm_size = SZ_4K * ((1 << (max_order + 1)) - 1);
KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
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, PAGE_SIZE);
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",
@ -699,7 +699,7 @@ static void drm_test_buddy_alloc_optimistic(struct kunit *test)
}
/* Should be completely full! */
size = get_size(0, PAGE_SIZE);
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!");
@ -716,7 +716,7 @@ static void drm_test_buddy_alloc_limit(struct kunit *test)
LIST_HEAD(allocated);
struct drm_buddy mm;
KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, size, PAGE_SIZE));
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,
@ -724,7 +724,7 @@ static void drm_test_buddy_alloc_limit(struct kunit *test)
size = mm.chunk_size << mm.max_order;
KUNIT_EXPECT_FALSE(test, drm_buddy_alloc_blocks(&mm, start, size, size,
PAGE_SIZE, &allocated, flags));
mm.chunk_size, &allocated, flags));
block = list_first_entry_or_null(&allocated, struct drm_buddy_block, link);
KUNIT_EXPECT_TRUE(test, block);
@ -734,10 +734,10 @@ static void drm_test_buddy_alloc_limit(struct kunit *test)
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,
BIT_ULL(mm.max_order) * mm.chunk_size,
"block size(%llu) != %llu\n",
drm_buddy_block_size(&mm, block),
BIT_ULL(mm.max_order) * PAGE_SIZE);
BIT_ULL(mm.max_order) * mm.chunk_size);
drm_buddy_free_list(&mm, &allocated, 0);
drm_buddy_fini(&mm);

6
include/drm/drm_buddy.h
View File

@ -56,8 +56,8 @@ struct drm_buddy_block {
struct list_head tmp_link;
};
/* Order-zero must be at least PAGE_SIZE */
#define DRM_BUDDY_MAX_ORDER (63 - PAGE_SHIFT)
/* Order-zero must be at least SZ_4K */
#define DRM_BUDDY_MAX_ORDER (63 - 12)
/*
* Binary Buddy System.
@ -85,7 +85,7 @@ struct drm_buddy {
unsigned int n_roots;
unsigned int max_order;
/* Must be at least PAGE_SIZE */
/* Must be at least SZ_4K */
u64 chunk_size;
u64 size;
u64 avail;