drivers/gpu/drm/ttm/tests/ttm_tt_test.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/ttm/tests/ttm_tt_test.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/ttm/tests/ttm_tt_test.c
Extension
.c
Size
10412 bytes
Lines
403
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ttm_tt_test_case {
	const char *description;
	u32 size;
	u32 extra_pages_num;
};

static const struct ttm_tt_test_case ttm_tt_init_basic_cases[] = {
	{
		.description = "Page-aligned size",
		.size = SZ_4K,
	},
	{
		.description = "Extra pages requested",
		.size = SZ_4K,
		.extra_pages_num = 1,
	},
};

static void ttm_tt_init_case_desc(const struct ttm_tt_test_case *t,
				  char *desc)
{
	strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
}

KUNIT_ARRAY_PARAM(ttm_tt_init_basic, ttm_tt_init_basic_cases,
		  ttm_tt_init_case_desc);

static void ttm_tt_init_basic(struct kunit *test)
{
	const struct ttm_tt_test_case *params = test->param_value;
	struct ttm_buffer_object *bo;
	struct ttm_tt *tt;
	u32 page_flags = TTM_TT_FLAG_ZERO_ALLOC;
	enum ttm_caching caching = ttm_cached;
	u32 extra_pages = params->extra_pages_num;
	int num_pages = params->size >> PAGE_SHIFT;
	int err;

	tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, tt);

	bo = ttm_bo_kunit_init(test, test->priv, params->size, NULL);

	err = ttm_tt_init(tt, bo, page_flags, caching, extra_pages);
	KUNIT_ASSERT_EQ(test, err, 0);

	KUNIT_ASSERT_EQ(test, tt->num_pages, num_pages + extra_pages);

	KUNIT_ASSERT_EQ(test, tt->page_flags, page_flags);
	KUNIT_ASSERT_EQ(test, tt->caching, caching);

	KUNIT_ASSERT_NULL(test, tt->dma_address);
	KUNIT_ASSERT_NULL(test, tt->swap_storage);
}

static void ttm_tt_init_misaligned(struct kunit *test)
{
	struct ttm_buffer_object *bo;
	struct ttm_tt *tt;
	enum ttm_caching caching = ttm_cached;
	u32 size = SZ_8K;
	int num_pages = (size + SZ_4K) >> PAGE_SHIFT;
	int err;

	tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, tt);

	bo = ttm_bo_kunit_init(test, test->priv, size, NULL);

	/* Make the object size misaligned */
	bo->base.size += 1;

	err = ttm_tt_init(tt, bo, 0, caching, 0);
	KUNIT_ASSERT_EQ(test, err, 0);

	KUNIT_ASSERT_EQ(test, tt->num_pages, num_pages);
}

static void ttm_tt_fini_basic(struct kunit *test)
{
	struct ttm_buffer_object *bo;
	struct ttm_tt *tt;
	enum ttm_caching caching = ttm_cached;
	int err;

	tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
	KUNIT_ASSERT_NOT_NULL(test, tt);

	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE, NULL);

Annotation

Implementation Notes