Add tests for functions that add and release pages to TTs. Test the
swapin operation. Export ttm_tt_unpopulate, ttm_tt_swapin and
ttm_tt_swapout symbols for testing purposes.
Signed-off-by: Karolina Stolarek <karolina.stolarek@xxxxxxxxx>
Reviewed-by: Somalapuram, Amaranath <asomalap@xxxxxxx>
Tested-by: Somalapuram, Amaranath <asomalap@xxxxxxx>
---
drivers/gpu/drm/ttm/tests/ttm_tt_test.c | 119 ++++++++++++++++++++++++
drivers/gpu/drm/ttm/ttm_tt.c | 3 +
2 files changed, 122 insertions(+)
diff --git a/drivers/gpu/drm/ttm/tests/ttm_tt_test.c b/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
index 17988fa99fa6..a9d75a33acaf 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
@@ -256,6 +256,120 @@ static void ttm_tt_destroy_basic(struct kunit *test)
ttm_tt_destroy(devs->ttm_dev, bo->ttm);
}
+static void ttm_tt_populate_null_ttm(struct kunit *test)
+{
+ const struct ttm_test_devices *devs = test->priv;
+ struct ttm_operation_ctx ctx = { };
+ int err;
+
+ err = ttm_tt_populate(devs->ttm_dev, NULL, &ctx);
+ KUNIT_ASSERT_EQ(test, err, -EINVAL);
+}
+
+static void ttm_tt_populate_populated_ttm(struct kunit *test)
+{
+ const struct ttm_test_devices *devs = test->priv;
+ struct ttm_operation_ctx ctx = { };
+ struct ttm_buffer_object *bo;
+ struct ttm_tt *tt;
+ struct page *populated_page;
+ int err;
+
+ bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE, NULL);
+
+ tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, tt);
+
+ err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+ KUNIT_ASSERT_EQ(test, err, 0);
+ populated_page = *tt->pages;
+
+ err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+ KUNIT_ASSERT_PTR_EQ(test, populated_page, *tt->pages);
+}
+
+static void ttm_tt_unpopulate_basic(struct kunit *test)
+{
+ const struct ttm_test_devices *devs = test->priv;
+ struct ttm_operation_ctx ctx = { };
+ struct ttm_buffer_object *bo;
+ struct ttm_tt *tt;
+ int err;
+
+ bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE, NULL);
+
+ tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, tt);
+
+ err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+ KUNIT_ASSERT_EQ(test, err, 0);
+ KUNIT_ASSERT_TRUE(test, ttm_tt_is_populated(tt));
+
+ ttm_tt_unpopulate(devs->ttm_dev, tt);
+ KUNIT_ASSERT_FALSE(test, ttm_tt_is_populated(tt));
+}
+
+static void ttm_tt_unpopulate_empty_ttm(struct kunit *test)
+{
+ const struct ttm_test_devices *devs = test->priv;
+ struct ttm_buffer_object *bo;
+ struct ttm_tt *tt;
+ int err;
+
+ bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE, NULL);
+
+ tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, tt);
+
+ err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ ttm_tt_unpopulate(devs->ttm_dev, tt);
+ /* Expect graceful handling of unpopulated TTs */
+}
+
+static void ttm_tt_swapin_basic(struct kunit *test)
+{
+ const struct ttm_test_devices *devs = test->priv;
+ int expected_num_pages = BO_SIZE >> PAGE_SHIFT;
+ struct ttm_operation_ctx ctx = { };
+ struct ttm_buffer_object *bo;
+ struct ttm_tt *tt;
+ int err, num_pages;
+
+ bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE, NULL);
+
+ tt = kunit_kzalloc(test, sizeof(*tt), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, tt);
+
+ err = ttm_tt_init(tt, bo, 0, ttm_cached, 0);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ err = ttm_tt_populate(devs->ttm_dev, tt, &ctx);
+ KUNIT_ASSERT_EQ(test, err, 0);
+ KUNIT_ASSERT_TRUE(test, ttm_tt_is_populated(tt));
+
+ num_pages = ttm_tt_swapout(devs->ttm_dev, tt, GFP_KERNEL);
+ KUNIT_ASSERT_EQ(test, num_pages, expected_num_pages);
+ KUNIT_ASSERT_NOT_NULL(test, tt->swap_storage);
+ KUNIT_ASSERT_TRUE(test, tt->page_flags & TTM_TT_FLAG_SWAPPED);
+
+ /* Swapout depopulates TT, allocate pages and then swap them in */
+ err = ttm_pool_alloc(&devs->ttm_dev->pool, tt, &ctx);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ err = ttm_tt_swapin(tt);
+ KUNIT_ASSERT_EQ(test, err, 0);
+ KUNIT_ASSERT_NULL(test, tt->swap_storage);
+ KUNIT_ASSERT_FALSE(test, tt->page_flags & TTM_TT_FLAG_SWAPPED);
+}
+
static struct kunit_case ttm_tt_test_cases[] = {
KUNIT_CASE_PARAM(ttm_tt_init_basic, ttm_tt_init_basic_gen_params),
KUNIT_CASE(ttm_tt_init_misaligned),
@@ -267,6 +381,11 @@ static struct kunit_case ttm_tt_test_cases[] = {
KUNIT_CASE(ttm_tt_create_ttm_exists),
KUNIT_CASE(ttm_tt_create_failed),
KUNIT_CASE(ttm_tt_destroy_basic),
+ KUNIT_CASE(ttm_tt_populate_null_ttm),
+ KUNIT_CASE(ttm_tt_populate_populated_ttm),
+ KUNIT_CASE(ttm_tt_unpopulate_basic),
+ KUNIT_CASE(ttm_tt_unpopulate_empty_ttm),
+ KUNIT_CASE(ttm_tt_swapin_basic),
{}
};
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 7b00ddf0ce49..4b51b9023126 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -251,6 +251,7 @@ int ttm_tt_swapin(struct ttm_tt *ttm)
out_err:
return ret;
}
+EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapin);
/**
* ttm_tt_swapout - swap out tt object
@@ -308,6 +309,7 @@ int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
return ret;
}
+EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapout);
int ttm_tt_populate(struct ttm_device *bdev,
struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
@@ -386,6 +388,7 @@ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
ttm->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
}
+EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_unpopulate);
#ifdef CONFIG_DEBUG_FS
--
2.34.1
