diff options
| -rw-r--r-- | drivers/gpu/drm/selftests/drm_buddy_selftests.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/selftests/test-drm_buddy.c | 80 |
2 files changed, 81 insertions, 0 deletions
diff --git a/drivers/gpu/drm/selftests/drm_buddy_selftests.h b/drivers/gpu/drm/selftests/drm_buddy_selftests.h index 3230bfd2770b..21a6bd38864f 100644 --- a/drivers/gpu/drm/selftests/drm_buddy_selftests.h +++ b/drivers/gpu/drm/selftests/drm_buddy_selftests.h @@ -9,3 +9,4 @@ selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */ selftest(buddy_alloc_limit, igt_buddy_alloc_limit) selftest(buddy_alloc_range, igt_buddy_alloc_range) +selftest(buddy_alloc_optimistic, igt_buddy_alloc_optimistic) diff --git a/drivers/gpu/drm/selftests/test-drm_buddy.c b/drivers/gpu/drm/selftests/test-drm_buddy.c index 586e0673a67c..f20d3ad1ac65 100644 --- a/drivers/gpu/drm/selftests/test-drm_buddy.c +++ b/drivers/gpu/drm/selftests/test-drm_buddy.c @@ -17,6 +17,11 @@ static unsigned int random_seed; +static inline u64 get_size(int order, u64 chunk_size) +{ + return (1 << order) * chunk_size; +} + static inline const char *yesno(bool v) { return v ? "yes" : "no"; @@ -309,6 +314,81 @@ static void igt_mm_config(u64 *size, u64 *chunk_size) *size = (u64)s << 12; } +static int igt_buddy_alloc_optimistic(void *arg) +{ + u64 mm_size, size, min_page_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, err; + + /* + * 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); + err = drm_buddy_init(&mm, + mm_size, + PAGE_SIZE); + if (err) { + pr_err("buddy_init failed(%d)\n", err); + return err; + } + + BUG_ON(mm.max_order != max_order); + + for (order = 0; order <= max_order; order++) { + size = min_page_size = get_size(order, PAGE_SIZE); + err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags); + if (err) { + pr_info("buddy_alloc hit -ENOMEM with order=%d\n", + order); + goto err; + } + + block = list_first_entry_or_null(&tmp, + struct drm_buddy_block, + link); + if (!block) { + pr_err("alloc_blocks has no blocks\n"); + err = -EINVAL; + goto err; + } + + list_move_tail(&block->link, &blocks); + } + + /* Should be completely full! */ + size = min_page_size = get_size(0, PAGE_SIZE); + err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags); + if (!err) { + pr_info("buddy_alloc unexpectedly succeeded, it should be full!"); + block = list_first_entry_or_null(&tmp, + struct drm_buddy_block, + link); + if (!block) { + pr_err("alloc_blocks has no blocks\n"); + err = -EINVAL; + goto err; + } + + list_move_tail(&block->link, &blocks); + err = -EINVAL; + goto err; + } else { + err = 0; + } + +err: + drm_buddy_free_list(&mm, &blocks); + drm_buddy_fini(&mm); + return err; +} + static int igt_buddy_alloc_range(void *arg) { unsigned long flags = DRM_BUDDY_RANGE_ALLOCATION; |