[PATCH v3 0/4] Improve test coverage of TTM

[PATCH v3 0/4] Improve test coverage of TTM

[Karolina Stolarek]

Add tests for building blocks of the TTM subsystem, such as ttm_resource,
ttm_resource_manager, ttm_tt and ttm_buffer_object. This series covers
basic functions such as initialization, allocation and clean-up of each
struct. Testing of ttm_buffer_object also includes locking and unlocking
the object for validation, with special scenarios such as an interrupted
wait or deadlock.

Some of the test cases check the bulk move mechanism and how it interacts
with pinned buffers. This is to be seen if we want to add dedicated testing
for bulk move or not. The resource allocation subtests use ttm_sys_manager
for now. Resources that don't use system memory will be indirectly tested
via tests for ttm_bo_validate()/ttm_bo_init_validate(), using a mock
resource manager.

Use kunit_tool script to manually run all the tests:

$ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/ttm/tests

To build a kernel with TTM KUnit tests, first enable CONFIG_KUNIT, and
then CONFIG_DRM_TTM_KUNIT_TEST.

Many thanks,
Karolina

v3:
  - Instead of modifying the main TTM Makefile, use
    EXPORT_SYMBOL_FOR_TESTS_ONLY() macro for symbols that are tested but
    not widely exported. Thanks to this change, TTM tests can be built
    as modules, even when non-exported functions are used
  - Change the description of a patch that fixes ttm_pool_pre_populated()

v2:
  - Remove Makefile for KUnit tests and move the definitions to the
    TTM's one
  - Switch on CONFIG_DRM_TTM_KUNIT_TEST=m so the tests and TTM module
    are built as one. This allows building the tests as a module, even
    if it uses functions that are not exported
  - Fix ttm_pool_pre_populated(); a wrong flag was passed to
    ttm_tt_kunit_init() function

Karolina Stolarek (4):
  drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man
  drm/ttm/tests: Add tests for ttm_tt
  drm/ttm/tests: Add tests for ttm_bo functions
  drm/ttm/tests: Fix argument in ttm_tt_kunit_init()

 drivers/gpu/drm/ttm/tests/Makefile            |   3 +
 drivers/gpu/drm/ttm/tests/ttm_bo_test.c       | 620 ++++++++++++++++++
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  48 ++
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
 drivers/gpu/drm/ttm/tests/ttm_pool_test.c     |   3 +-
 drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 ++++++++++
 drivers/gpu/drm/ttm/tests/ttm_tt_test.c       | 277 ++++++++
 drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
 drivers/gpu/drm/ttm/ttm_tt.c                  |   3 +
 9 files changed, 1294 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpu/drm/ttm/tests/ttm_bo_test.c
 create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
 create mode 100644 drivers/gpu/drm/ttm/tests/ttm_tt_test.c

-- 
2.25.1

[PATCH v3 1/4] drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man

[Karolina Stolarek]

Test initialization of ttm_resource using different memory domains.
Add tests for a system memory manager and functions that can be
tested without a fully-featured resource manager. Update
ttm_bo_kunit_init() to initialize BO's kref and reservation object.
Export ttm_resource_alloc symbol for test purposes only.

Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
---
 drivers/gpu/drm/ttm/tests/Makefile            |   1 +
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  23 ++
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
 drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 ++++++++++++++++++
 drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
 5 files changed, 366 insertions(+)
 create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c

diff --git a/drivers/gpu/drm/ttm/tests/Makefile b/drivers/gpu/drm/ttm/tests/Makefile
index ec87c4fc1ad5..c92fe2052ef6 100644
--- a/drivers/gpu/drm/ttm/tests/Makefile
+++ b/drivers/gpu/drm/ttm/tests/Makefile
@@ -3,4 +3,5 @@
 obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
         ttm_device_test.o \
         ttm_pool_test.o \
+        ttm_resource_test.o \
         ttm_kunit_helpers.o
diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
index 81661d8827aa..eccc59b981f8 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
@@ -38,10 +38,33 @@ struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
 	bo->base = gem_obj;
 	bo->bdev = devs->ttm_dev;
 
+	kref_init(&bo->kref);
+
+	dma_resv_init(&bo->base._resv);
+	bo->base.resv = &bo->base._resv;
+
 	return bo;
 }
 EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
 
+struct ttm_place *ttm_place_kunit_init(struct kunit *test,
+				       uint32_t mem_type, uint32_t flags,
+				       size_t size)
+{
+	struct ttm_place *place;
+
+	place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, place);
+
+	place->mem_type = mem_type;
+	place->flags = flags;
+	place->fpfn = size >> PAGE_SHIFT;
+	place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
+
+	return place;
+}
+EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
+
 struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
 {
 	struct ttm_test_devices *devs;
diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
index e261e3660d0b..f38140f93c05 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
+++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
@@ -8,6 +8,7 @@
 #include <drm/drm_drv.h>
 #include <drm/ttm/ttm_device.h>
 #include <drm/ttm/ttm_bo.h>
+#include <drm/ttm/ttm_placement.h>
 
 #include <drm/drm_kunit_helpers.h>
 #include <kunit/test.h>
@@ -28,6 +29,9 @@ int ttm_device_kunit_init(struct ttm_test_devices *priv,
 struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
 					    struct ttm_test_devices *devs,
 					    size_t size);
+struct ttm_place *ttm_place_kunit_init(struct kunit *test,
+				       uint32_t mem_type, uint32_t flags,
+				       size_t size);
 
 struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
 struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
diff --git a/drivers/gpu/drm/ttm/tests/ttm_resource_test.c b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
new file mode 100644
index 000000000000..851cdc43dc37
--- /dev/null
+++ b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0 AND MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+#include <drm/ttm/ttm_resource.h>
+
+#include "ttm_kunit_helpers.h"
+
+#define RES_SIZE		SZ_4K
+#define TTM_PRIV_DUMMY_REG	(TTM_NUM_MEM_TYPES - 1)
+
+struct ttm_resource_test_case {
+	const char *description;
+	uint32_t mem_type;
+	uint32_t flags;
+};
+
+struct ttm_resource_test_priv {
+	struct ttm_test_devices *devs;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+};
+
+static const struct ttm_resource_manager_func ttm_resource_manager_mock_funcs = { };
+
+static int ttm_resource_test_init(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	priv->devs = ttm_test_devices_all(test);
+	KUNIT_ASSERT_NOT_NULL(test, priv->devs);
+
+	test->priv = priv;
+
+	return 0;
+}
+
+static void ttm_resource_test_fini(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+
+	ttm_test_devices_put(test, priv->devs);
+}
+
+static void ttm_init_test_mocks(struct kunit *test,
+				struct ttm_resource_test_priv *priv,
+				uint32_t mem_type, uint32_t flags)
+{
+	size_t size = RES_SIZE;
+
+	/* Make sure we have what we need for a good BO mock */
+	KUNIT_ASSERT_NOT_NULL(test, priv->devs->ttm_dev);
+
+	priv->bo = ttm_bo_kunit_init(test, priv->devs, size);
+	priv->place = ttm_place_kunit_init(test, mem_type, flags, size);
+}
+
+static void ttm_init_test_manager(struct kunit *test,
+				  struct ttm_resource_test_priv *priv,
+				  uint32_t mem_type)
+{
+	struct ttm_device *ttm_dev = priv->devs->ttm_dev;
+	struct ttm_resource_manager *man;
+	size_t size = SZ_16K;
+
+	man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, man);
+
+	man->use_tt = false;
+	man->func = &ttm_resource_manager_mock_funcs;
+
+	ttm_resource_manager_init(man, ttm_dev, size);
+	ttm_set_driver_manager(ttm_dev, mem_type, man);
+	ttm_resource_manager_set_used(man, true);
+}
+
+static const struct ttm_resource_test_case ttm_resource_cases[] = {
+	{
+		.description = "Init resource in TTM_PL_SYSTEM",
+		.mem_type = TTM_PL_SYSTEM,
+	},
+	{
+		.description = "Init resource in TTM_PL_VRAM",
+		.mem_type = TTM_PL_VRAM,
+	},
+	{
+		.description = "Init resource in a private placement",
+		.mem_type = TTM_PRIV_DUMMY_REG,
+	},
+	{
+		.description = "Init resource in TTM_PL_SYSTEM, set placement flags",
+		.mem_type = TTM_PL_SYSTEM,
+		.flags = TTM_PL_FLAG_TOPDOWN,
+	},
+};
+
+static void ttm_resource_case_desc(const struct ttm_resource_test_case *t, char *desc)
+{
+	strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(ttm_resource, ttm_resource_cases, ttm_resource_case_desc);
+
+static void ttm_resource_init_basic(struct kunit *test)
+{
+	const struct ttm_resource_test_case *params = test->param_value;
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource *res;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+	struct ttm_resource_manager *man;
+	uint64_t expected_usage;
+
+	ttm_init_test_mocks(test, priv, params->mem_type, params->flags);
+	bo = priv->bo;
+	place = priv->place;
+
+	if (params->mem_type > TTM_PL_SYSTEM)
+		ttm_init_test_manager(test, priv, params->mem_type);
+
+	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, res);
+
+	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
+	expected_usage = man->usage + RES_SIZE;
+
+	KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
+
+	ttm_resource_init(bo, place, res);
+
+	KUNIT_ASSERT_EQ(test, res->start, 0);
+	KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
+	KUNIT_ASSERT_EQ(test, res->mem_type, place->mem_type);
+	KUNIT_ASSERT_EQ(test, res->placement, place->flags);
+	KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
+
+	KUNIT_ASSERT_NULL(test, res->bus.addr);
+	KUNIT_ASSERT_EQ(test, res->bus.offset, 0);
+	KUNIT_ASSERT_FALSE(test, res->bus.is_iomem);
+	KUNIT_ASSERT_EQ(test, res->bus.caching, ttm_cached);
+	KUNIT_ASSERT_EQ(test, man->usage, expected_usage);
+
+	KUNIT_ASSERT_TRUE(test, list_is_singular(&man->lru[bo->priority]));
+
+	ttm_resource_fini(man, res);
+}
+
+static void ttm_resource_init_pinned(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource *res;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+	struct ttm_resource_manager *man;
+
+	ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
+	bo = priv->bo;
+	place = priv->place;
+
+	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
+
+	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, res);
+	KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_pin(bo);
+	ttm_resource_init(bo, place, res);
+	KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
+
+	ttm_bo_unpin(bo);
+	ttm_resource_fini(man, res);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
+}
+
+static void ttm_resource_fini_basic(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource *res;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+	struct ttm_resource_manager *man;
+
+	ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
+	bo = priv->bo;
+	place = priv->place;
+
+	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
+
+	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, res);
+
+	ttm_resource_init(bo, place, res);
+	ttm_resource_fini(man, res);
+
+	KUNIT_ASSERT_TRUE(test, list_empty(&res->lru));
+	KUNIT_ASSERT_EQ(test, man->usage, 0);
+}
+
+static void ttm_resource_manager_init_basic(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource_manager *man;
+	size_t size = SZ_16K;
+
+	man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, man);
+
+	ttm_resource_manager_init(man, priv->devs->ttm_dev, size);
+
+	KUNIT_ASSERT_PTR_EQ(test, man->bdev, priv->devs->ttm_dev);
+	KUNIT_ASSERT_EQ(test, man->size, size);
+	KUNIT_ASSERT_EQ(test, man->usage, 0);
+	KUNIT_ASSERT_NULL(test, man->move);
+	KUNIT_ASSERT_NOT_NULL(test, &man->move_lock);
+
+	for (int i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
+		KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[i]));
+}
+
+static void ttm_resource_manager_usage_basic(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource *res;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+	struct ttm_resource_manager *man;
+	uint64_t actual_usage;
+
+	ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, TTM_PL_FLAG_TOPDOWN);
+	bo = priv->bo;
+	place = priv->place;
+
+	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, res);
+
+	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
+
+	ttm_resource_init(bo, place, res);
+	actual_usage = ttm_resource_manager_usage(man);
+
+	KUNIT_ASSERT_EQ(test, actual_usage, RES_SIZE);
+
+	ttm_resource_fini(man, res);
+}
+
+static void ttm_resource_manager_set_used_basic(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource_manager *man;
+
+	man = ttm_manager_type(priv->devs->ttm_dev, TTM_PL_SYSTEM);
+	KUNIT_ASSERT_TRUE(test, man->use_type);
+
+	ttm_resource_manager_set_used(man, false);
+	KUNIT_ASSERT_FALSE(test, man->use_type);
+}
+
+static void ttm_sys_man_alloc_basic(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource_manager *man;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+	struct ttm_resource *res;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	int ret;
+
+	ttm_init_test_mocks(test, priv, mem_type, 0);
+	bo = priv->bo;
+	place = priv->place;
+
+	man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
+	ret = man->func->alloc(man, bo, place, &res);
+
+	KUNIT_ASSERT_EQ(test, ret, 0);
+	KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
+	KUNIT_ASSERT_EQ(test, res->mem_type, mem_type);
+	KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
+
+	ttm_resource_fini(man, res);
+}
+
+static void ttm_sys_man_free_basic(struct kunit *test)
+{
+	struct ttm_resource_test_priv *priv = test->priv;
+	struct ttm_resource_manager *man;
+	struct ttm_buffer_object *bo;
+	struct ttm_place *place;
+	struct ttm_resource *res;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+
+	ttm_init_test_mocks(test, priv, mem_type, 0);
+	bo = priv->bo;
+	place = priv->place;
+
+	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, res);
+
+	ttm_resource_alloc(bo, place, &res);
+
+	man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
+	man->func->free(man, res);
+
+	KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
+	KUNIT_ASSERT_EQ(test, man->usage, 0);
+}
+
+static struct kunit_case ttm_resource_test_cases[] = {
+	KUNIT_CASE_PARAM(ttm_resource_init_basic, ttm_resource_gen_params),
+	KUNIT_CASE(ttm_resource_init_pinned),
+	KUNIT_CASE(ttm_resource_fini_basic),
+	KUNIT_CASE(ttm_resource_manager_init_basic),
+	KUNIT_CASE(ttm_resource_manager_usage_basic),
+	KUNIT_CASE(ttm_resource_manager_set_used_basic),
+	KUNIT_CASE(ttm_sys_man_alloc_basic),
+	KUNIT_CASE(ttm_sys_man_free_basic),
+	{}
+};
+
+static struct kunit_suite ttm_resource_test_suite = {
+	.name = "ttm_resource",
+	.init = ttm_resource_test_init,
+	.exit = ttm_resource_test_fini,
+	.test_cases = ttm_resource_test_cases,
+};
+
+kunit_test_suites(&ttm_resource_test_suite);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index 46ff9c75bb12..02b96d23fdb9 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -30,6 +30,8 @@
 #include <drm/ttm/ttm_placement.h>
 #include <drm/ttm/ttm_resource.h>
 
+#include <drm/drm_util.h>
+
 /**
  * ttm_lru_bulk_move_init - initialize a bulk move structure
  * @bulk: the structure to init
@@ -240,6 +242,7 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
 	spin_unlock(&bo->bdev->lru_lock);
 	return 0;
 }
+EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
 
 void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
 {
-- 
2.25.1

[PATCH v3 2/4] drm/ttm/tests: Add tests for ttm_tt

[Karolina Stolarek]

Test initialization, creation and destruction of ttm_tt instances.
Export ttm_tt_destroy and ttm_tt_create symbols for test purposes.

Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
---
 drivers/gpu/drm/ttm/tests/Makefile            |   1 +
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  20 ++
 drivers/gpu/drm/ttm/tests/ttm_tt_test.c       | 277 ++++++++++++++++++
 drivers/gpu/drm/ttm/ttm_tt.c                  |   3 +
 4 files changed, 301 insertions(+)
 create mode 100644 drivers/gpu/drm/ttm/tests/ttm_tt_test.c

diff --git a/drivers/gpu/drm/ttm/tests/Makefile b/drivers/gpu/drm/ttm/tests/Makefile
index c92fe2052ef6..f570530bbb60 100644
--- a/drivers/gpu/drm/ttm/tests/Makefile
+++ b/drivers/gpu/drm/ttm/tests/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
         ttm_device_test.o \
         ttm_pool_test.o \
         ttm_resource_test.o \
+        ttm_tt_test.o \
         ttm_kunit_helpers.o
diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
index eccc59b981f8..112381153bbf 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
@@ -2,9 +2,29 @@
 /*
  * Copyright © 2023 Intel Corporation
  */
+#include <drm/ttm/ttm_tt.h>
+
 #include "ttm_kunit_helpers.h"
 
+static struct ttm_tt *ttm_tt_simple_create(struct ttm_buffer_object *bo,
+					   uint32_t page_flags)
+{
+	struct ttm_tt *tt;
+
+	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+	ttm_tt_init(tt, bo, 0, ttm_cached, 0);
+
+	return tt;
+}
+
+static void ttm_tt_simple_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
+{
+	kfree(ttm);
+}
+
 struct ttm_device_funcs ttm_dev_funcs = {
+	.ttm_tt_create = ttm_tt_simple_create,
+	.ttm_tt_destroy = ttm_tt_simple_destroy,
 };
 EXPORT_SYMBOL_GPL(ttm_dev_funcs);
 
diff --git a/drivers/gpu/drm/ttm/tests/ttm_tt_test.c b/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
new file mode 100644
index 000000000000..1300ca93e523
--- /dev/null
+++ b/drivers/gpu/drm/ttm/tests/ttm_tt_test.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0 AND MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+#include <linux/mm.h>
+#include <linux/shmem_fs.h>
+
+#include <drm/ttm/ttm_tt.h>
+
+#include "ttm_kunit_helpers.h"
+
+#define BO_SIZE		SZ_4K
+
+struct ttm_tt_test_case {
+	const char *description;
+	uint32_t size;
+	uint32_t extra_pages_num;
+};
+
+static int ttm_tt_test_init(struct kunit *test)
+{
+	struct ttm_test_devices *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	priv = ttm_test_devices_all(test);
+	test->priv = priv;
+
+	return 0;
+}
+
+static const struct ttm_tt_test_case ttm_tt_init_basic_cases[] = {
+	{
+		.description = "Page-aligned size",
+		.size = SZ_4K,
+	},
+	{
+		.description = "Misaligned size",
+		.size = SZ_8K + 1,
+	},
+	{
+		.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;
+	uint32_t page_flags = TTM_TT_FLAG_ZERO_ALLOC;
+	enum ttm_caching caching = ttm_cached;
+	uint32_t extra_pages = params->extra_pages_num;
+	int num_pages = PAGE_ALIGN(params->size) / PAGE_SIZE;
+	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);
+
+	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_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);
+
+	err = ttm_tt_init(tt, bo, 0, caching, 0);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	KUNIT_ASSERT_NOT_NULL(test, tt->pages);
+
+	ttm_tt_fini(tt);
+	KUNIT_ASSERT_NULL(test, tt->pages);
+}
+
+static void ttm_tt_fini_sg(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);
+
+	err = ttm_sg_tt_init(tt, bo, 0, caching);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	KUNIT_ASSERT_NOT_NULL(test, tt->dma_address);
+
+	ttm_tt_fini(tt);
+	KUNIT_ASSERT_NULL(test, tt->dma_address);
+}
+
+static void ttm_tt_fini_shmem(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	struct ttm_tt *tt;
+	struct file *shmem;
+	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);
+
+	err = ttm_tt_init(tt, bo, 0, caching, 0);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	shmem = shmem_file_setup("ttm swap", BO_SIZE, 0);
+	tt->swap_storage = shmem;
+
+	ttm_tt_fini(tt);
+	KUNIT_ASSERT_NULL(test, tt->swap_storage);
+}
+
+static void ttm_tt_create_basic(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo->type = ttm_bo_type_device;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	err = ttm_tt_create(bo, false);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_EXPECT_EQ(test, err, 0);
+	KUNIT_EXPECT_NOT_NULL(test, bo->ttm);
+
+	/* Free manually, as it was allocated outside of KUnit */
+	kfree(bo->ttm);
+}
+
+static void ttm_tt_create_invalid_bo_type(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo->type = ttm_bo_type_sg + 1;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	err = ttm_tt_create(bo, false);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_EXPECT_EQ(test, err, -EINVAL);
+	KUNIT_EXPECT_NULL(test, bo->ttm);
+}
+
+static void ttm_tt_create_ttm_exists(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);
+
+	err = ttm_tt_init(tt, bo, 0, caching, 0);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo->ttm = tt;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	err = ttm_tt_create(bo, false);
+	dma_resv_unlock(bo->base.resv);
+
+	/* Expect to keep the previous TTM */
+	KUNIT_ASSERT_EQ(test, err, 0);
+	KUNIT_ASSERT_PTR_EQ(test, tt, bo->ttm);
+}
+
+static struct ttm_tt *ttm_tt_null_create(struct ttm_buffer_object *bo,
+					 uint32_t page_flags)
+{
+	return NULL;
+}
+
+struct ttm_device_funcs ttm_dev_empty_funcs = {
+	.ttm_tt_create = ttm_tt_null_create,
+};
+
+static void ttm_tt_create_failed(struct kunit *test)
+{
+	const struct ttm_test_devices *devs = test->priv;
+	struct ttm_buffer_object *bo;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	/* Update ttm_device_funcs so we don't alloc ttm_tt */
+	devs->ttm_dev->funcs = &ttm_dev_empty_funcs;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	err = ttm_tt_create(bo, false);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_EQ(test, err, -ENOMEM);
+}
+
+static void ttm_tt_destroy_basic(struct kunit *test)
+{
+	const struct ttm_test_devices *devs = test->priv;
+	struct ttm_buffer_object *bo;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	dma_resv_lock(bo->base.resv, NULL);
+	err = ttm_tt_create(bo, false);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_EQ(test, err, 0);
+	KUNIT_ASSERT_NOT_NULL(test, bo->ttm);
+
+	ttm_tt_destroy(devs->ttm_dev, bo->ttm);
+}
+
+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_fini_basic),
+	KUNIT_CASE(ttm_tt_fini_sg),
+	KUNIT_CASE(ttm_tt_fini_shmem),
+	KUNIT_CASE(ttm_tt_create_basic),
+	KUNIT_CASE(ttm_tt_create_invalid_bo_type),
+	KUNIT_CASE(ttm_tt_create_ttm_exists),
+	KUNIT_CASE(ttm_tt_create_failed),
+	KUNIT_CASE(ttm_tt_destroy_basic),
+	{}
+};
+
+static struct kunit_suite ttm_tt_test_suite = {
+	.name = "ttm_tt",
+	.init = ttm_tt_test_init,
+	.exit = ttm_test_devices_fini,
+	.test_cases = ttm_tt_test_cases,
+};
+
+kunit_test_suites(&ttm_tt_test_suite);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index e0a77671edd6..d978dc539a9b 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -36,6 +36,7 @@
 #include <linux/file.h>
 #include <linux/module.h>
 #include <drm/drm_cache.h>
+#include <drm/drm_util.h>
 #include <drm/ttm/ttm_bo.h>
 #include <drm/ttm/ttm_tt.h>
 
@@ -91,6 +92,7 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
 
 	return 0;
 }
+EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_create);
 
 /*
  * Allocates storage for pointers to the pages that back the ttm.
@@ -129,6 +131,7 @@ void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
 {
 	bdev->funcs->ttm_tt_destroy(bdev, ttm);
 }
+EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_destroy);
 
 static void ttm_tt_init_fields(struct ttm_tt *ttm,
 			       struct ttm_buffer_object *bo,
-- 
2.25.1

[PATCH v3 3/4] drm/ttm/tests: Add tests for ttm_bo functions

[Karolina Stolarek]

Test reservation and release of TTM buffer objects. Add tests to check
pin and unpin operations.

Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
---
 drivers/gpu/drm/ttm/tests/Makefile            |   1 +
 drivers/gpu/drm/ttm/tests/ttm_bo_test.c       | 620 ++++++++++++++++++
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |   5 +
 3 files changed, 626 insertions(+)
 create mode 100644 drivers/gpu/drm/ttm/tests/ttm_bo_test.c

diff --git a/drivers/gpu/drm/ttm/tests/Makefile b/drivers/gpu/drm/ttm/tests/Makefile
index f570530bbb60..468535f7eed2 100644
--- a/drivers/gpu/drm/ttm/tests/Makefile
+++ b/drivers/gpu/drm/ttm/tests/Makefile
@@ -5,4 +5,5 @@ obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
         ttm_pool_test.o \
         ttm_resource_test.o \
         ttm_tt_test.o \
+        ttm_bo_test.o \
         ttm_kunit_helpers.o
diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
new file mode 100644
index 000000000000..48d71f1fe65d
--- /dev/null
+++ b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
@@ -0,0 +1,620 @@
+// SPDX-License-Identifier: GPL-2.0 AND MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+#include <linux/dma-resv.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/mutex.h>
+#include <linux/ww_mutex.h>
+
+#include <drm/ttm/ttm_resource.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/ttm/ttm_tt.h>
+
+#include "ttm_kunit_helpers.h"
+
+#define BO_SIZE		SZ_8K
+
+struct ttm_bo_test_case {
+	const char *description;
+	bool interruptible;
+	bool no_wait;
+};
+
+static const struct ttm_bo_test_case ttm_bo_reserved_cases[] = {
+	{
+		.description = "Cannot be interrupted and sleeps",
+		.interruptible = false,
+		.no_wait = false,
+	},
+	{
+		.description = "Cannot be interrupted, locks straight away",
+		.interruptible = false,
+		.no_wait = true,
+	},
+	{
+		.description = "Can be interrupted, sleeps",
+		.interruptible = true,
+		.no_wait = false,
+	},
+};
+
+static void ttm_bo_init_case_desc(const struct ttm_bo_test_case *t,
+				  char *desc)
+{
+	strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(ttm_bo_reserve, ttm_bo_reserved_cases, ttm_bo_init_case_desc);
+
+static void ttm_bo_reserve_optimistic_no_ticket(struct kunit *test)
+{
+	const struct ttm_bo_test_case *params = test->param_value;
+	struct ttm_buffer_object *bo;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	err = ttm_bo_reserve(bo, params->interruptible, params->no_wait, NULL);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	dma_resv_unlock(bo->base.resv);
+}
+
+static void ttm_bo_reserve_locked_no_sleep(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	bool interruptible = false;
+	bool no_wait = true;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	/* Let's lock it beforehand */
+	dma_resv_lock(bo->base.resv, NULL);
+
+	err = ttm_bo_reserve(bo, interruptible, no_wait, NULL);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_EQ(test, err, -EBUSY);
+}
+
+static void ttm_bo_reserve_no_wait_ticket(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	struct ww_acquire_ctx ctx;
+	bool interruptible = false;
+	bool no_wait = true;
+	int err;
+
+	ww_acquire_init(&ctx, &reservation_ww_class);
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	err = ttm_bo_reserve(bo, interruptible, no_wait, &ctx);
+	KUNIT_ASSERT_EQ(test, err, -EBUSY);
+
+	ww_acquire_fini(&ctx);
+}
+
+static void ttm_bo_reserve_double_resv(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	struct ww_acquire_ctx ctx;
+	bool interruptible = false;
+	bool no_wait = false;
+	int err;
+
+	ww_acquire_init(&ctx, &reservation_ww_class);
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	err = ttm_bo_reserve(bo, interruptible, no_wait, &ctx);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	err = ttm_bo_reserve(bo, interruptible, no_wait, &ctx);
+
+	ww_acquire_fini(&ctx);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_EQ(test, err, -EALREADY);
+}
+
+/*
+ * A test case heavily inspired by ww_test_edeadlk_normal(). Checks
+ * if -EDEADLK is properly propagated by ttm_bo_reserve()
+ */
+static void ttm_bo_reserve_deadlock(struct kunit *test)
+{
+	struct ttm_buffer_object *bo1, *bo2;
+	struct ww_acquire_ctx ctx1, ctx2;
+	bool interruptible = false;
+	bool no_wait = false;
+	int err;
+
+	bo1 = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo2 = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	mutex_lock(&bo2->base.resv->lock.base);
+	bo2->base.resv->lock.ctx = &ctx2;
+
+	ww_acquire_init(&ctx1, &reservation_ww_class);
+	ctx2 = ctx1;
+	ctx2.stamp--; /* Make the context holding the lock younger */
+
+	err = ttm_bo_reserve(bo1, interruptible, no_wait, &ctx1);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	err = ttm_bo_reserve(bo2, interruptible, no_wait, &ctx1);
+	KUNIT_ASSERT_EQ(test, err, -EDEADLK);
+
+	mutex_unlock(&bo2->base.resv->lock.base);
+
+	dma_resv_unlock(bo1->base.resv);
+
+	ww_acquire_fini(&ctx1);
+	ww_acquire_fini(&ctx2);
+}
+
+#if IS_BUILTIN(CONFIG_DRM_TTM_KUNIT_TEST)
+struct signal_timer {
+	struct timer_list timer;
+	struct ww_acquire_ctx *ctx;
+};
+
+static void signal_for_ttm_bo_reserve(struct timer_list *t)
+{
+	struct signal_timer *s_timer = from_timer(s_timer, t, timer);
+	struct task_struct *task = s_timer->ctx->task;
+
+	do_send_sig_info(SIGTERM, SEND_SIG_PRIV, task, PIDTYPE_PID);
+}
+
+static int threaded_ttm_bo_reserve(void *arg)
+{
+	struct ttm_buffer_object *bo = arg;
+	struct signal_timer s_timer;
+	struct ww_acquire_ctx ctx;
+	bool interruptible = true;
+	bool no_wait = false;
+	int err;
+
+	ww_acquire_init(&ctx, &reservation_ww_class);
+
+	/* Prepare a signal that will interrupt the reservation attempt */
+	timer_setup_on_stack(&s_timer.timer, &signal_for_ttm_bo_reserve, 0);
+	s_timer.ctx = &ctx;
+
+	mod_timer(&s_timer.timer, msecs_to_jiffies(100));
+
+	err = ttm_bo_reserve(bo, interruptible, no_wait, &ctx);
+
+	timer_delete_sync(&s_timer.timer);
+	destroy_timer_on_stack(&s_timer.timer);
+
+	ww_acquire_fini(&ctx);
+
+	return err;
+}
+
+static void ttm_bo_reserve_interrupted(struct kunit *test)
+{
+	struct ttm_buffer_object *bo;
+	struct task_struct *task;
+	int err;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	task = kthread_create(threaded_ttm_bo_reserve, bo, "ttm-bo-reserve");
+
+	if (IS_ERR(task))
+		KUNIT_FAIL(test, "Couldn't create ttm bo reserve task\n");
+
+	/* Take a lock so the threaded reserve has to wait */
+	mutex_lock(&bo->base.resv->lock.base);
+
+	wake_up_process(task);
+	msleep(20);
+	err = kthread_stop(task);
+
+	mutex_unlock(&bo->base.resv->lock.base);
+
+	KUNIT_ASSERT_EQ(test, err, -ERESTARTSYS);
+}
+#endif /* IS_BUILTIN(CONFIG_DRM_TTM_KUNIT_TEST) */
+
+static void ttm_bo_unreserve_basic(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_buffer_object *bo;
+	struct ttm_device *ttm_dev;
+	struct ttm_resource *res1, *res2;
+	struct ttm_place *place;
+	struct ttm_resource_manager *man;
+	unsigned int bo_prio = TTM_MAX_BO_PRIORITY - 1;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	int err;
+
+	place = ttm_place_kunit_init(test, mem_type, 0, BO_SIZE);
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo->priority = bo_prio;
+
+	err = ttm_resource_alloc(bo, place, &res1);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	bo->resource = res1;
+
+	/* Add a dummy resource to populate LRU */
+	ttm_resource_alloc(bo, place, &res2);
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_unreserve(bo);
+
+	man = ttm_manager_type(priv->ttm_dev, mem_type);
+	KUNIT_ASSERT_EQ(test,
+			list_is_last(&res1->lru, &man->lru[bo->priority]), 1);
+
+	ttm_resource_free(bo, &res2);
+	ttm_resource_free(bo, &res1);
+}
+
+static void ttm_bo_unreserve_pinned(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_buffer_object *bo;
+	struct ttm_device *ttm_dev;
+	struct ttm_resource *res1, *res2;
+	struct ttm_place *place;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	int err;
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	place = ttm_place_kunit_init(test, mem_type, 0, BO_SIZE);
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_pin(bo);
+
+	err = ttm_resource_alloc(bo, place, &res1);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo->resource = res1;
+
+	/* Add a dummy resource to the pinned list */
+	err = ttm_resource_alloc(bo, place, &res2);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	KUNIT_ASSERT_EQ(test,
+			list_is_last(&res2->lru, &priv->ttm_dev->pinned), 1);
+
+	ttm_bo_unreserve(bo);
+	KUNIT_ASSERT_EQ(test,
+			list_is_last(&res1->lru, &priv->ttm_dev->pinned), 1);
+
+	ttm_resource_free(bo, &res1);
+	ttm_resource_free(bo, &res2);
+}
+
+static void ttm_bo_unreserve_bulk(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_lru_bulk_move lru_bulk_move;
+	struct ttm_lru_bulk_move_pos *pos;
+	struct ttm_buffer_object *bo1, *bo2;
+	struct ttm_resource *res1, *res2;
+	struct ttm_device *ttm_dev;
+	struct ttm_place *place;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	unsigned int bo_priority = 0;
+	int err;
+
+	ttm_lru_bulk_move_init(&lru_bulk_move);
+
+	place = ttm_place_kunit_init(test, mem_type, 0, BO_SIZE);
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo1 = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo2 = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	dma_resv_lock(bo1->base.resv, NULL);
+	ttm_bo_set_bulk_move(bo1, &lru_bulk_move);
+	dma_resv_unlock(bo1->base.resv);
+
+	err = ttm_resource_alloc(bo1, place, &res1);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo1->resource = res1;
+
+	dma_resv_lock(bo2->base.resv, NULL);
+	ttm_bo_set_bulk_move(bo2, &lru_bulk_move);
+	dma_resv_unlock(bo2->base.resv);
+
+	err = ttm_resource_alloc(bo2, place, &res2);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo2->resource = res2;
+
+	ttm_bo_reserve(bo1, false, false, NULL);
+	ttm_bo_unreserve(bo1);
+
+	pos = &lru_bulk_move.pos[mem_type][bo_priority];
+	KUNIT_ASSERT_PTR_EQ(test, res1, pos->last);
+
+	ttm_resource_free(bo1, &res1);
+	ttm_resource_free(bo2, &res2);
+}
+
+static void ttm_bo_put_basic(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_buffer_object *bo;
+	struct ttm_resource *res;
+	struct ttm_device *ttm_dev;
+	struct ttm_place *place;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	int err;
+
+	place = ttm_place_kunit_init(test, mem_type, 0, BO_SIZE);
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo->type = ttm_bo_type_device;
+
+	err = ttm_resource_alloc(bo, place, &res);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo->resource = res;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	err = ttm_tt_create(bo, false);
+	dma_resv_unlock(bo->base.resv);
+	KUNIT_EXPECT_EQ(test, err, 0);
+
+	ttm_bo_put(bo);
+}
+
+static const char *mock_name(struct dma_fence *f)
+{
+	return "kunit-ttm-bo-put";
+}
+
+static const struct dma_fence_ops mock_fence_ops = {
+	.get_driver_name = mock_name,
+	.get_timeline_name = mock_name,
+};
+
+static void ttm_bo_put_shared_resv(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_buffer_object *bo;
+	struct dma_resv *external_resv;
+	struct dma_fence *fence;
+	/* A dummy DMA fence lock */
+	spinlock_t fence_lock;
+	struct ttm_device *ttm_dev;
+	int err;
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	external_resv = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, external_resv);
+
+	dma_resv_init(external_resv);
+
+	fence = kunit_kzalloc(test, sizeof(*fence), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, fence);
+
+	spin_lock_init(&fence_lock);
+	dma_fence_init(fence, &mock_fence_ops, &fence_lock, 0, 0);
+
+	dma_resv_lock(external_resv, NULL);
+	dma_resv_reserve_fences(external_resv, 1);
+	dma_resv_add_fence(external_resv, fence, DMA_RESV_USAGE_BOOKKEEP);
+	dma_resv_unlock(external_resv);
+
+	dma_fence_signal(fence);
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+	bo->type = ttm_bo_type_device;
+	bo->base.resv = external_resv;
+
+	ttm_bo_put(bo);
+}
+
+static void ttm_bo_pin_basic(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_buffer_object *bo;
+	struct ttm_device *ttm_dev;
+	unsigned int no_pins = 3;
+	int err;
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	for (int i = 0; i < no_pins; i++) {
+		dma_resv_lock(bo->base.resv, NULL);
+		ttm_bo_pin(bo);
+		dma_resv_unlock(bo->base.resv);
+	}
+
+	KUNIT_ASSERT_EQ(test, bo->pin_count, no_pins);
+}
+
+static void ttm_bo_pin_unpin_resource(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_lru_bulk_move lru_bulk_move;
+	struct ttm_lru_bulk_move_pos *pos;
+	struct ttm_buffer_object *bo;
+	struct ttm_resource *res;
+	struct ttm_device *ttm_dev;
+	struct ttm_place *place;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	unsigned int bo_priority = 0;
+	int err;
+
+	ttm_lru_bulk_move_init(&lru_bulk_move);
+
+	place = ttm_place_kunit_init(test, mem_type, 0, BO_SIZE);
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	err = ttm_resource_alloc(bo, place, &res);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo->resource = res;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_set_bulk_move(bo, &lru_bulk_move);
+	ttm_bo_pin(bo);
+	dma_resv_unlock(bo->base.resv);
+
+	pos = &lru_bulk_move.pos[mem_type][bo_priority];
+
+	KUNIT_ASSERT_EQ(test, bo->pin_count, 1);
+	KUNIT_ASSERT_NULL(test, pos->first);
+	KUNIT_ASSERT_NULL(test, pos->last);
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_unpin(bo);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_PTR_EQ(test, res, pos->last);
+	KUNIT_ASSERT_EQ(test, bo->pin_count, 0);
+
+	ttm_resource_free(bo, &res);
+}
+
+static void ttm_bo_multiple_pin_one_unpin(struct kunit *test)
+{
+	struct ttm_test_devices *priv = test->priv;
+	struct ttm_lru_bulk_move lru_bulk_move;
+	struct ttm_lru_bulk_move_pos *pos;
+	struct ttm_buffer_object *bo;
+	struct ttm_resource *res;
+	struct ttm_device *ttm_dev;
+	struct ttm_place *place;
+	uint32_t mem_type = TTM_PL_SYSTEM;
+	unsigned int bo_priority = 0;
+	int err;
+
+	ttm_lru_bulk_move_init(&lru_bulk_move);
+
+	place = ttm_place_kunit_init(test, mem_type, 0, BO_SIZE);
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(priv, ttm_dev, false, false);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	priv->ttm_dev = ttm_dev;
+
+	bo = ttm_bo_kunit_init(test, test->priv, BO_SIZE);
+
+	err = ttm_resource_alloc(bo, place, &res);
+	KUNIT_ASSERT_EQ(test, err, 0);
+	bo->resource = res;
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_set_bulk_move(bo, &lru_bulk_move);
+
+	/* Multiple pins */
+	ttm_bo_pin(bo);
+	ttm_bo_pin(bo);
+
+	dma_resv_unlock(bo->base.resv);
+
+	pos = &lru_bulk_move.pos[mem_type][bo_priority];
+
+	KUNIT_ASSERT_EQ(test, bo->pin_count, 2);
+	KUNIT_ASSERT_NULL(test, pos->first);
+	KUNIT_ASSERT_NULL(test, pos->last);
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_unpin(bo);
+	dma_resv_unlock(bo->base.resv);
+
+	KUNIT_ASSERT_EQ(test, bo->pin_count, 1);
+	KUNIT_ASSERT_NULL(test, pos->first);
+	KUNIT_ASSERT_NULL(test, pos->last);
+
+	dma_resv_lock(bo->base.resv, NULL);
+	ttm_bo_unpin(bo);
+	dma_resv_unlock(bo->base.resv);
+
+	ttm_resource_free(bo, &res);
+}
+
+static struct kunit_case ttm_bo_test_cases[] = {
+	KUNIT_CASE_PARAM(ttm_bo_reserve_optimistic_no_ticket,
+			 ttm_bo_reserve_gen_params),
+	KUNIT_CASE(ttm_bo_reserve_locked_no_sleep),
+	KUNIT_CASE(ttm_bo_reserve_no_wait_ticket),
+	KUNIT_CASE(ttm_bo_reserve_double_resv),
+#if IS_BUILTIN(CONFIG_DRM_TTM_KUNIT_TEST)
+	KUNIT_CASE(ttm_bo_reserve_interrupted),
+#endif
+	KUNIT_CASE(ttm_bo_reserve_deadlock),
+	KUNIT_CASE(ttm_bo_unreserve_basic),
+	KUNIT_CASE(ttm_bo_unreserve_pinned),
+	KUNIT_CASE(ttm_bo_unreserve_bulk),
+	KUNIT_CASE(ttm_bo_put_basic),
+	KUNIT_CASE(ttm_bo_put_shared_resv),
+	KUNIT_CASE(ttm_bo_pin_basic),
+	KUNIT_CASE(ttm_bo_pin_unpin_resource),
+	KUNIT_CASE(ttm_bo_multiple_pin_one_unpin),
+	{}
+};
+
+static struct kunit_suite ttm_bo_test_suite = {
+	.name = "ttm_bo",
+	.init = ttm_test_devices_init,
+	.exit = ttm_test_devices_fini,
+	.test_cases = ttm_bo_test_cases,
+};
+
+kunit_test_suites(&ttm_bo_test_suite);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
index 112381153bbf..dbe562c59677 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
@@ -22,6 +22,10 @@ static void ttm_tt_simple_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
 	kfree(ttm);
 }
 
+static void dummy_ttm_bo_destroy(struct ttm_buffer_object *bo)
+{
+}
+
 struct ttm_device_funcs ttm_dev_funcs = {
 	.ttm_tt_create = ttm_tt_simple_create,
 	.ttm_tt_destroy = ttm_tt_simple_destroy,
@@ -57,6 +61,7 @@ struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
 
 	bo->base = gem_obj;
 	bo->bdev = devs->ttm_dev;
+	bo->destroy = dummy_ttm_bo_destroy;
 
 	kref_init(&bo->kref);
 
-- 
2.25.1

[PATCH v3 4/4] drm/ttm/tests: Fix argument in ttm_tt_kunit_init()

[Karolina Stolarek]

Remove a leftover definition of page order and pass an empty flag value
in ttm_pool_pre_populated().

Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
---
 drivers/gpu/drm/ttm/tests/ttm_pool_test.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/tests/ttm_pool_test.c b/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
index 2d9cae8cd984..b97f7b6daf5b 100644
--- a/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
+++ b/drivers/gpu/drm/ttm/tests/ttm_pool_test.c
@@ -78,10 +78,9 @@ static struct ttm_pool *ttm_pool_pre_populated(struct kunit *test,
 	struct ttm_test_devices *devs = priv->devs;
 	struct ttm_pool *pool;
 	struct ttm_tt *tt;
-	unsigned long order = __fls(size / PAGE_SIZE);
 	int err;
 
-	tt = ttm_tt_kunit_init(test, order, caching, size);
+	tt = ttm_tt_kunit_init(test, 0, caching, size);
 	KUNIT_ASSERT_NOT_NULL(test, tt);
 
 	pool = kunit_kzalloc(test, sizeof(*pool), GFP_KERNEL);
-- 
2.25.1

Re: [PATCH v3 1/4] drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man

[Christian König]

Am 12.09.23 um 13:49 schrieb Karolina Stolarek:
> Test initialization of ttm_resource using different memory domains.
> Add tests for a system memory manager and functions that can be
> tested without a fully-featured resource manager. Update
> ttm_bo_kunit_init() to initialize BO's kref and reservation object.
> Export ttm_resource_alloc symbol for test purposes only.
>
> Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
> ---
>   drivers/gpu/drm/ttm/tests/Makefile            |   1 +
>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  23 ++
>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
>   drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 ++++++++++++++++++
>   drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
>   5 files changed, 366 insertions(+)
>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>
> diff --git a/drivers/gpu/drm/ttm/tests/Makefile b/drivers/gpu/drm/ttm/tests/Makefile
> index ec87c4fc1ad5..c92fe2052ef6 100644
> --- a/drivers/gpu/drm/ttm/tests/Makefile
> +++ b/drivers/gpu/drm/ttm/tests/Makefile
> @@ -3,4 +3,5 @@
>   obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
>           ttm_device_test.o \
>           ttm_pool_test.o \
> +        ttm_resource_test.o \
>           ttm_kunit_helpers.o
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> index 81661d8827aa..eccc59b981f8 100644
> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> @@ -38,10 +38,33 @@ struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
>   	bo->base = gem_obj;
>   	bo->bdev = devs->ttm_dev;
>   
> +	kref_init(&bo->kref);
> +
> +	dma_resv_init(&bo->base._resv);
> +	bo->base.resv = &bo->base._resv;
> +

I'm really wondering if we shouldn't now initialize the GEM object properly?

That would also initialize the reservation object if I remember correctly.

The solution with EXPORT_SYMBOL_FOR_TESTS_ONLY looks really nice I think 
and apart from that I can't see anything obviously wrong either, but I 
only skimmed over the code.

Regards,
Christian.

>   	return bo;
>   }
>   EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
>   
> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
> +				       uint32_t mem_type, uint32_t flags,
> +				       size_t size)
> +{
> +	struct ttm_place *place;
> +
> +	place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, place);
> +
> +	place->mem_type = mem_type;
> +	place->flags = flags;
> +	place->fpfn = size >> PAGE_SHIFT;
> +	place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
> +
> +	return place;
> +}
> +EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
> +
>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
>   {
>   	struct ttm_test_devices *devs;
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> index e261e3660d0b..f38140f93c05 100644
> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> @@ -8,6 +8,7 @@
>   #include <drm/drm_drv.h>
>   #include <drm/ttm/ttm_device.h>
>   #include <drm/ttm/ttm_bo.h>
> +#include <drm/ttm/ttm_placement.h>
>   
>   #include <drm/drm_kunit_helpers.h>
>   #include <kunit/test.h>
> @@ -28,6 +29,9 @@ int ttm_device_kunit_init(struct ttm_test_devices *priv,
>   struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
>   					    struct ttm_test_devices *devs,
>   					    size_t size);
> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
> +				       uint32_t mem_type, uint32_t flags,
> +				       size_t size);
>   
>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
>   struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_resource_test.c b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
> new file mode 100644
> index 000000000000..851cdc43dc37
> --- /dev/null
> +++ b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
> @@ -0,0 +1,335 @@
> +// SPDX-License-Identifier: GPL-2.0 AND MIT
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +#include <drm/ttm/ttm_resource.h>
> +
> +#include "ttm_kunit_helpers.h"
> +
> +#define RES_SIZE		SZ_4K
> +#define TTM_PRIV_DUMMY_REG	(TTM_NUM_MEM_TYPES - 1)
> +
> +struct ttm_resource_test_case {
> +	const char *description;
> +	uint32_t mem_type;
> +	uint32_t flags;
> +};
> +
> +struct ttm_resource_test_priv {
> +	struct ttm_test_devices *devs;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +};
> +
> +static const struct ttm_resource_manager_func ttm_resource_manager_mock_funcs = { };
> +
> +static int ttm_resource_test_init(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv;
> +
> +	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, priv);
> +
> +	priv->devs = ttm_test_devices_all(test);
> +	KUNIT_ASSERT_NOT_NULL(test, priv->devs);
> +
> +	test->priv = priv;
> +
> +	return 0;
> +}
> +
> +static void ttm_resource_test_fini(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +
> +	ttm_test_devices_put(test, priv->devs);
> +}
> +
> +static void ttm_init_test_mocks(struct kunit *test,
> +				struct ttm_resource_test_priv *priv,
> +				uint32_t mem_type, uint32_t flags)
> +{
> +	size_t size = RES_SIZE;
> +
> +	/* Make sure we have what we need for a good BO mock */
> +	KUNIT_ASSERT_NOT_NULL(test, priv->devs->ttm_dev);
> +
> +	priv->bo = ttm_bo_kunit_init(test, priv->devs, size);
> +	priv->place = ttm_place_kunit_init(test, mem_type, flags, size);
> +}
> +
> +static void ttm_init_test_manager(struct kunit *test,
> +				  struct ttm_resource_test_priv *priv,
> +				  uint32_t mem_type)
> +{
> +	struct ttm_device *ttm_dev = priv->devs->ttm_dev;
> +	struct ttm_resource_manager *man;
> +	size_t size = SZ_16K;
> +
> +	man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, man);
> +
> +	man->use_tt = false;
> +	man->func = &ttm_resource_manager_mock_funcs;
> +
> +	ttm_resource_manager_init(man, ttm_dev, size);
> +	ttm_set_driver_manager(ttm_dev, mem_type, man);
> +	ttm_resource_manager_set_used(man, true);
> +}
> +
> +static const struct ttm_resource_test_case ttm_resource_cases[] = {
> +	{
> +		.description = "Init resource in TTM_PL_SYSTEM",
> +		.mem_type = TTM_PL_SYSTEM,
> +	},
> +	{
> +		.description = "Init resource in TTM_PL_VRAM",
> +		.mem_type = TTM_PL_VRAM,
> +	},
> +	{
> +		.description = "Init resource in a private placement",
> +		.mem_type = TTM_PRIV_DUMMY_REG,
> +	},
> +	{
> +		.description = "Init resource in TTM_PL_SYSTEM, set placement flags",
> +		.mem_type = TTM_PL_SYSTEM,
> +		.flags = TTM_PL_FLAG_TOPDOWN,
> +	},
> +};
> +
> +static void ttm_resource_case_desc(const struct ttm_resource_test_case *t, char *desc)
> +{
> +	strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
> +}
> +
> +KUNIT_ARRAY_PARAM(ttm_resource, ttm_resource_cases, ttm_resource_case_desc);
> +
> +static void ttm_resource_init_basic(struct kunit *test)
> +{
> +	const struct ttm_resource_test_case *params = test->param_value;
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource *res;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +	struct ttm_resource_manager *man;
> +	uint64_t expected_usage;
> +
> +	ttm_init_test_mocks(test, priv, params->mem_type, params->flags);
> +	bo = priv->bo;
> +	place = priv->place;
> +
> +	if (params->mem_type > TTM_PL_SYSTEM)
> +		ttm_init_test_manager(test, priv, params->mem_type);
> +
> +	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, res);
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
> +	expected_usage = man->usage + RES_SIZE;
> +
> +	KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
> +
> +	ttm_resource_init(bo, place, res);
> +
> +	KUNIT_ASSERT_EQ(test, res->start, 0);
> +	KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
> +	KUNIT_ASSERT_EQ(test, res->mem_type, place->mem_type);
> +	KUNIT_ASSERT_EQ(test, res->placement, place->flags);
> +	KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
> +
> +	KUNIT_ASSERT_NULL(test, res->bus.addr);
> +	KUNIT_ASSERT_EQ(test, res->bus.offset, 0);
> +	KUNIT_ASSERT_FALSE(test, res->bus.is_iomem);
> +	KUNIT_ASSERT_EQ(test, res->bus.caching, ttm_cached);
> +	KUNIT_ASSERT_EQ(test, man->usage, expected_usage);
> +
> +	KUNIT_ASSERT_TRUE(test, list_is_singular(&man->lru[bo->priority]));
> +
> +	ttm_resource_fini(man, res);
> +}
> +
> +static void ttm_resource_init_pinned(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource *res;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +	struct ttm_resource_manager *man;
> +
> +	ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
> +	bo = priv->bo;
> +	place = priv->place;
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
> +
> +	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, res);
> +	KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
> +
> +	dma_resv_lock(bo->base.resv, NULL);
> +	ttm_bo_pin(bo);
> +	ttm_resource_init(bo, place, res);
> +	KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
> +
> +	ttm_bo_unpin(bo);
> +	ttm_resource_fini(man, res);
> +	dma_resv_unlock(bo->base.resv);
> +
> +	KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
> +}
> +
> +static void ttm_resource_fini_basic(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource *res;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +	struct ttm_resource_manager *man;
> +
> +	ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
> +	bo = priv->bo;
> +	place = priv->place;
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
> +
> +	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, res);
> +
> +	ttm_resource_init(bo, place, res);
> +	ttm_resource_fini(man, res);
> +
> +	KUNIT_ASSERT_TRUE(test, list_empty(&res->lru));
> +	KUNIT_ASSERT_EQ(test, man->usage, 0);
> +}
> +
> +static void ttm_resource_manager_init_basic(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource_manager *man;
> +	size_t size = SZ_16K;
> +
> +	man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, man);
> +
> +	ttm_resource_manager_init(man, priv->devs->ttm_dev, size);
> +
> +	KUNIT_ASSERT_PTR_EQ(test, man->bdev, priv->devs->ttm_dev);
> +	KUNIT_ASSERT_EQ(test, man->size, size);
> +	KUNIT_ASSERT_EQ(test, man->usage, 0);
> +	KUNIT_ASSERT_NULL(test, man->move);
> +	KUNIT_ASSERT_NOT_NULL(test, &man->move_lock);
> +
> +	for (int i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
> +		KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[i]));
> +}
> +
> +static void ttm_resource_manager_usage_basic(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource *res;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +	struct ttm_resource_manager *man;
> +	uint64_t actual_usage;
> +
> +	ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, TTM_PL_FLAG_TOPDOWN);
> +	bo = priv->bo;
> +	place = priv->place;
> +
> +	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, res);
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
> +
> +	ttm_resource_init(bo, place, res);
> +	actual_usage = ttm_resource_manager_usage(man);
> +
> +	KUNIT_ASSERT_EQ(test, actual_usage, RES_SIZE);
> +
> +	ttm_resource_fini(man, res);
> +}
> +
> +static void ttm_resource_manager_set_used_basic(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource_manager *man;
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, TTM_PL_SYSTEM);
> +	KUNIT_ASSERT_TRUE(test, man->use_type);
> +
> +	ttm_resource_manager_set_used(man, false);
> +	KUNIT_ASSERT_FALSE(test, man->use_type);
> +}
> +
> +static void ttm_sys_man_alloc_basic(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource_manager *man;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +	struct ttm_resource *res;
> +	uint32_t mem_type = TTM_PL_SYSTEM;
> +	int ret;
> +
> +	ttm_init_test_mocks(test, priv, mem_type, 0);
> +	bo = priv->bo;
> +	place = priv->place;
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
> +	ret = man->func->alloc(man, bo, place, &res);
> +
> +	KUNIT_ASSERT_EQ(test, ret, 0);
> +	KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
> +	KUNIT_ASSERT_EQ(test, res->mem_type, mem_type);
> +	KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
> +
> +	ttm_resource_fini(man, res);
> +}
> +
> +static void ttm_sys_man_free_basic(struct kunit *test)
> +{
> +	struct ttm_resource_test_priv *priv = test->priv;
> +	struct ttm_resource_manager *man;
> +	struct ttm_buffer_object *bo;
> +	struct ttm_place *place;
> +	struct ttm_resource *res;
> +	uint32_t mem_type = TTM_PL_SYSTEM;
> +
> +	ttm_init_test_mocks(test, priv, mem_type, 0);
> +	bo = priv->bo;
> +	place = priv->place;
> +
> +	res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
> +	KUNIT_ASSERT_NOT_NULL(test, res);
> +
> +	ttm_resource_alloc(bo, place, &res);
> +
> +	man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
> +	man->func->free(man, res);
> +
> +	KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
> +	KUNIT_ASSERT_EQ(test, man->usage, 0);
> +}
> +
> +static struct kunit_case ttm_resource_test_cases[] = {
> +	KUNIT_CASE_PARAM(ttm_resource_init_basic, ttm_resource_gen_params),
> +	KUNIT_CASE(ttm_resource_init_pinned),
> +	KUNIT_CASE(ttm_resource_fini_basic),
> +	KUNIT_CASE(ttm_resource_manager_init_basic),
> +	KUNIT_CASE(ttm_resource_manager_usage_basic),
> +	KUNIT_CASE(ttm_resource_manager_set_used_basic),
> +	KUNIT_CASE(ttm_sys_man_alloc_basic),
> +	KUNIT_CASE(ttm_sys_man_free_basic),
> +	{}
> +};
> +
> +static struct kunit_suite ttm_resource_test_suite = {
> +	.name = "ttm_resource",
> +	.init = ttm_resource_test_init,
> +	.exit = ttm_resource_test_fini,
> +	.test_cases = ttm_resource_test_cases,
> +};
> +
> +kunit_test_suites(&ttm_resource_test_suite);
> +
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
> index 46ff9c75bb12..02b96d23fdb9 100644
> --- a/drivers/gpu/drm/ttm/ttm_resource.c
> +++ b/drivers/gpu/drm/ttm/ttm_resource.c
> @@ -30,6 +30,8 @@
>   #include <drm/ttm/ttm_placement.h>
>   #include <drm/ttm/ttm_resource.h>
>   
> +#include <drm/drm_util.h>
> +
>   /**
>    * ttm_lru_bulk_move_init - initialize a bulk move structure
>    * @bulk: the structure to init
> @@ -240,6 +242,7 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
>   	spin_unlock(&bo->bdev->lru_lock);
>   	return 0;
>   }
> +EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
>   
>   void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res)
>   {

Re: [PATCH v3 1/4] drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man

[Karolina Stolarek]

On 12.09.2023 14:54, Christian König wrote:
> Am 12.09.23 um 13:49 schrieb Karolina Stolarek:
>> Test initialization of ttm_resource using different memory domains.
>> Add tests for a system memory manager and functions that can be
>> tested without a fully-featured resource manager. Update
>> ttm_bo_kunit_init() to initialize BO's kref and reservation object.
>> Export ttm_resource_alloc symbol for test purposes only.
>>
>> Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
>> ---
>>   drivers/gpu/drm/ttm/tests/Makefile            |   1 +
>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  23 ++
>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
>>   drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 ++++++++++++++++++
>>   drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
>>   5 files changed, 366 insertions(+)
>>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>
>> diff --git a/drivers/gpu/drm/ttm/tests/Makefile 
>> b/drivers/gpu/drm/ttm/tests/Makefile
>> index ec87c4fc1ad5..c92fe2052ef6 100644
>> --- a/drivers/gpu/drm/ttm/tests/Makefile
>> +++ b/drivers/gpu/drm/ttm/tests/Makefile
>> @@ -3,4 +3,5 @@
>>   obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
>>           ttm_device_test.o \
>>           ttm_pool_test.o \
>> +        ttm_resource_test.o \
>>           ttm_kunit_helpers.o
>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c 
>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>> index 81661d8827aa..eccc59b981f8 100644
>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>> @@ -38,10 +38,33 @@ struct ttm_buffer_object *ttm_bo_kunit_init(struct 
>> kunit *test,
>>       bo->base = gem_obj;
>>       bo->bdev = devs->ttm_dev;
>> +    kref_init(&bo->kref);
>> +
>> +    dma_resv_init(&bo->base._resv);
>> +    bo->base.resv = &bo->base._resv;
>> +
> 
> I'm really wondering if we shouldn't now initialize the GEM object 
> properly?
> 
> That would also initialize the reservation object if I remember correctly.

Do you mean by using drm_gem_object_init()?

> 
> The solution with EXPORT_SYMBOL_FOR_TESTS_ONLY looks really nice I think 
> and apart from that I can't see anything obviously wrong either, but I 
> only skimmed over the code.

I'm also glad with EXPORT_SYMBOL_FOR_TESTS_ONLY solution, it's much 
better now. Right, you can take a closer look at the next version. I'll 
try to get an actual GEM object here, if you think that's feasible.

All the best,
Karolina

> 
> Regards,
> Christian.
> 
>>       return bo;
>>   }
>>   EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>> +                       uint32_t mem_type, uint32_t flags,
>> +                       size_t size)
>> +{
>> +    struct ttm_place *place;
>> +
>> +    place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, place);
>> +
>> +    place->mem_type = mem_type;
>> +    place->flags = flags;
>> +    place->fpfn = size >> PAGE_SHIFT;
>> +    place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
>> +
>> +    return place;
>> +}
>> +EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
>> +
>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
>>   {
>>       struct ttm_test_devices *devs;
>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h 
>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>> index e261e3660d0b..f38140f93c05 100644
>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>> @@ -8,6 +8,7 @@
>>   #include <drm/drm_drv.h>
>>   #include <drm/ttm/ttm_device.h>
>>   #include <drm/ttm/ttm_bo.h>
>> +#include <drm/ttm/ttm_placement.h>
>>   #include <drm/drm_kunit_helpers.h>
>>   #include <kunit/test.h>
>> @@ -28,6 +29,9 @@ int ttm_device_kunit_init(struct ttm_test_devices 
>> *priv,
>>   struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
>>                           struct ttm_test_devices *devs,
>>                           size_t size);
>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>> +                       uint32_t mem_type, uint32_t flags,
>> +                       size_t size);
>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
>>   struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_resource_test.c 
>> b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>> new file mode 100644
>> index 000000000000..851cdc43dc37
>> --- /dev/null
>> +++ b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>> @@ -0,0 +1,335 @@
>> +// SPDX-License-Identifier: GPL-2.0 AND MIT
>> +/*
>> + * Copyright © 2023 Intel Corporation
>> + */
>> +#include <drm/ttm/ttm_resource.h>
>> +
>> +#include "ttm_kunit_helpers.h"
>> +
>> +#define RES_SIZE        SZ_4K
>> +#define TTM_PRIV_DUMMY_REG    (TTM_NUM_MEM_TYPES - 1)
>> +
>> +struct ttm_resource_test_case {
>> +    const char *description;
>> +    uint32_t mem_type;
>> +    uint32_t flags;
>> +};
>> +
>> +struct ttm_resource_test_priv {
>> +    struct ttm_test_devices *devs;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +};
>> +
>> +static const struct ttm_resource_manager_func 
>> ttm_resource_manager_mock_funcs = { };
>> +
>> +static int ttm_resource_test_init(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv;
>> +
>> +    priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, priv);
>> +
>> +    priv->devs = ttm_test_devices_all(test);
>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs);
>> +
>> +    test->priv = priv;
>> +
>> +    return 0;
>> +}
>> +
>> +static void ttm_resource_test_fini(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +
>> +    ttm_test_devices_put(test, priv->devs);
>> +}
>> +
>> +static void ttm_init_test_mocks(struct kunit *test,
>> +                struct ttm_resource_test_priv *priv,
>> +                uint32_t mem_type, uint32_t flags)
>> +{
>> +    size_t size = RES_SIZE;
>> +
>> +    /* Make sure we have what we need for a good BO mock */
>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs->ttm_dev);
>> +
>> +    priv->bo = ttm_bo_kunit_init(test, priv->devs, size);
>> +    priv->place = ttm_place_kunit_init(test, mem_type, flags, size);
>> +}
>> +
>> +static void ttm_init_test_manager(struct kunit *test,
>> +                  struct ttm_resource_test_priv *priv,
>> +                  uint32_t mem_type)
>> +{
>> +    struct ttm_device *ttm_dev = priv->devs->ttm_dev;
>> +    struct ttm_resource_manager *man;
>> +    size_t size = SZ_16K;
>> +
>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>> +
>> +    man->use_tt = false;
>> +    man->func = &ttm_resource_manager_mock_funcs;
>> +
>> +    ttm_resource_manager_init(man, ttm_dev, size);
>> +    ttm_set_driver_manager(ttm_dev, mem_type, man);
>> +    ttm_resource_manager_set_used(man, true);
>> +}
>> +
>> +static const struct ttm_resource_test_case ttm_resource_cases[] = {
>> +    {
>> +        .description = "Init resource in TTM_PL_SYSTEM",
>> +        .mem_type = TTM_PL_SYSTEM,
>> +    },
>> +    {
>> +        .description = "Init resource in TTM_PL_VRAM",
>> +        .mem_type = TTM_PL_VRAM,
>> +    },
>> +    {
>> +        .description = "Init resource in a private placement",
>> +        .mem_type = TTM_PRIV_DUMMY_REG,
>> +    },
>> +    {
>> +        .description = "Init resource in TTM_PL_SYSTEM, set placement 
>> flags",
>> +        .mem_type = TTM_PL_SYSTEM,
>> +        .flags = TTM_PL_FLAG_TOPDOWN,
>> +    },
>> +};
>> +
>> +static void ttm_resource_case_desc(const struct 
>> ttm_resource_test_case *t, char *desc)
>> +{
>> +    strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
>> +}
>> +
>> +KUNIT_ARRAY_PARAM(ttm_resource, ttm_resource_cases, 
>> ttm_resource_case_desc);
>> +
>> +static void ttm_resource_init_basic(struct kunit *test)
>> +{
>> +    const struct ttm_resource_test_case *params = test->param_value;
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource *res;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +    struct ttm_resource_manager *man;
>> +    uint64_t expected_usage;
>> +
>> +    ttm_init_test_mocks(test, priv, params->mem_type, params->flags);
>> +    bo = priv->bo;
>> +    place = priv->place;
>> +
>> +    if (params->mem_type > TTM_PL_SYSTEM)
>> +        ttm_init_test_manager(test, priv, params->mem_type);
>> +
>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>> +    expected_usage = man->usage + RES_SIZE;
>> +
>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>> +
>> +    ttm_resource_init(bo, place, res);
>> +
>> +    KUNIT_ASSERT_EQ(test, res->start, 0);
>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>> +    KUNIT_ASSERT_EQ(test, res->mem_type, place->mem_type);
>> +    KUNIT_ASSERT_EQ(test, res->placement, place->flags);
>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>> +
>> +    KUNIT_ASSERT_NULL(test, res->bus.addr);
>> +    KUNIT_ASSERT_EQ(test, res->bus.offset, 0);
>> +    KUNIT_ASSERT_FALSE(test, res->bus.is_iomem);
>> +    KUNIT_ASSERT_EQ(test, res->bus.caching, ttm_cached);
>> +    KUNIT_ASSERT_EQ(test, man->usage, expected_usage);
>> +
>> +    KUNIT_ASSERT_TRUE(test, list_is_singular(&man->lru[bo->priority]));
>> +
>> +    ttm_resource_fini(man, res);
>> +}
>> +
>> +static void ttm_resource_init_pinned(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource *res;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +    struct ttm_resource_manager *man;
>> +
>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>> +    bo = priv->bo;
>> +    place = priv->place;
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>> +
>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>> +
>> +    dma_resv_lock(bo->base.resv, NULL);
>> +    ttm_bo_pin(bo);
>> +    ttm_resource_init(bo, place, res);
>> +    KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
>> +
>> +    ttm_bo_unpin(bo);
>> +    ttm_resource_fini(man, res);
>> +    dma_resv_unlock(bo->base.resv);
>> +
>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>> +}
>> +
>> +static void ttm_resource_fini_basic(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource *res;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +    struct ttm_resource_manager *man;
>> +
>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>> +    bo = priv->bo;
>> +    place = priv->place;
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>> +
>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>> +
>> +    ttm_resource_init(bo, place, res);
>> +    ttm_resource_fini(man, res);
>> +
>> +    KUNIT_ASSERT_TRUE(test, list_empty(&res->lru));
>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>> +}
>> +
>> +static void ttm_resource_manager_init_basic(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource_manager *man;
>> +    size_t size = SZ_16K;
>> +
>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>> +
>> +    ttm_resource_manager_init(man, priv->devs->ttm_dev, size);
>> +
>> +    KUNIT_ASSERT_PTR_EQ(test, man->bdev, priv->devs->ttm_dev);
>> +    KUNIT_ASSERT_EQ(test, man->size, size);
>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>> +    KUNIT_ASSERT_NULL(test, man->move);
>> +    KUNIT_ASSERT_NOT_NULL(test, &man->move_lock);
>> +
>> +    for (int i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
>> +        KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[i]));
>> +}
>> +
>> +static void ttm_resource_manager_usage_basic(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource *res;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +    struct ttm_resource_manager *man;
>> +    uint64_t actual_usage;
>> +
>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, TTM_PL_FLAG_TOPDOWN);
>> +    bo = priv->bo;
>> +    place = priv->place;
>> +
>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>> +
>> +    ttm_resource_init(bo, place, res);
>> +    actual_usage = ttm_resource_manager_usage(man);
>> +
>> +    KUNIT_ASSERT_EQ(test, actual_usage, RES_SIZE);
>> +
>> +    ttm_resource_fini(man, res);
>> +}
>> +
>> +static void ttm_resource_manager_set_used_basic(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource_manager *man;
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, TTM_PL_SYSTEM);
>> +    KUNIT_ASSERT_TRUE(test, man->use_type);
>> +
>> +    ttm_resource_manager_set_used(man, false);
>> +    KUNIT_ASSERT_FALSE(test, man->use_type);
>> +}
>> +
>> +static void ttm_sys_man_alloc_basic(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource_manager *man;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +    struct ttm_resource *res;
>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>> +    int ret;
>> +
>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>> +    bo = priv->bo;
>> +    place = priv->place;
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>> +    ret = man->func->alloc(man, bo, place, &res);
>> +
>> +    KUNIT_ASSERT_EQ(test, ret, 0);
>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>> +    KUNIT_ASSERT_EQ(test, res->mem_type, mem_type);
>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>> +
>> +    ttm_resource_fini(man, res);
>> +}
>> +
>> +static void ttm_sys_man_free_basic(struct kunit *test)
>> +{
>> +    struct ttm_resource_test_priv *priv = test->priv;
>> +    struct ttm_resource_manager *man;
>> +    struct ttm_buffer_object *bo;
>> +    struct ttm_place *place;
>> +    struct ttm_resource *res;
>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>> +
>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>> +    bo = priv->bo;
>> +    place = priv->place;
>> +
>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>> +
>> +    ttm_resource_alloc(bo, place, &res);
>> +
>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>> +    man->func->free(man, res);
>> +
>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>> +}
>> +
>> +static struct kunit_case ttm_resource_test_cases[] = {
>> +    KUNIT_CASE_PARAM(ttm_resource_init_basic, ttm_resource_gen_params),
>> +    KUNIT_CASE(ttm_resource_init_pinned),
>> +    KUNIT_CASE(ttm_resource_fini_basic),
>> +    KUNIT_CASE(ttm_resource_manager_init_basic),
>> +    KUNIT_CASE(ttm_resource_manager_usage_basic),
>> +    KUNIT_CASE(ttm_resource_manager_set_used_basic),
>> +    KUNIT_CASE(ttm_sys_man_alloc_basic),
>> +    KUNIT_CASE(ttm_sys_man_free_basic),
>> +    {}
>> +};
>> +
>> +static struct kunit_suite ttm_resource_test_suite = {
>> +    .name = "ttm_resource",
>> +    .init = ttm_resource_test_init,
>> +    .exit = ttm_resource_test_fini,
>> +    .test_cases = ttm_resource_test_cases,
>> +};
>> +
>> +kunit_test_suites(&ttm_resource_test_suite);
>> +
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/gpu/drm/ttm/ttm_resource.c 
>> b/drivers/gpu/drm/ttm/ttm_resource.c
>> index 46ff9c75bb12..02b96d23fdb9 100644
>> --- a/drivers/gpu/drm/ttm/ttm_resource.c
>> +++ b/drivers/gpu/drm/ttm/ttm_resource.c
>> @@ -30,6 +30,8 @@
>>   #include <drm/ttm/ttm_placement.h>
>>   #include <drm/ttm/ttm_resource.h>
>> +#include <drm/drm_util.h>
>> +
>>   /**
>>    * ttm_lru_bulk_move_init - initialize a bulk move structure
>>    * @bulk: the structure to init
>> @@ -240,6 +242,7 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
>>       spin_unlock(&bo->bdev->lru_lock);
>>       return 0;
>>   }
>> +EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
>>   void ttm_resource_free(struct ttm_buffer_object *bo, struct 
>> ttm_resource **res)
>>   {
> 

Re: [PATCH v3 1/4] drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man

[Christian König]

Am 18.09.23 um 13:48 schrieb Karolina Stolarek:
> On 12.09.2023 14:54, Christian König wrote:
>> Am 12.09.23 um 13:49 schrieb Karolina Stolarek:
>>> Test initialization of ttm_resource using different memory domains.
>>> Add tests for a system memory manager and functions that can be
>>> tested without a fully-featured resource manager. Update
>>> ttm_bo_kunit_init() to initialize BO's kref and reservation object.
>>> Export ttm_resource_alloc symbol for test purposes only.
>>>
>>> Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
>>> ---
>>>   drivers/gpu/drm/ttm/tests/Makefile            |   1 +
>>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  23 ++
>>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
>>>   drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 
>>> ++++++++++++++++++
>>>   drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
>>>   5 files changed, 366 insertions(+)
>>>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>>
>>> diff --git a/drivers/gpu/drm/ttm/tests/Makefile 
>>> b/drivers/gpu/drm/ttm/tests/Makefile
>>> index ec87c4fc1ad5..c92fe2052ef6 100644
>>> --- a/drivers/gpu/drm/ttm/tests/Makefile
>>> +++ b/drivers/gpu/drm/ttm/tests/Makefile
>>> @@ -3,4 +3,5 @@
>>>   obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
>>>           ttm_device_test.o \
>>>           ttm_pool_test.o \
>>> +        ttm_resource_test.o \
>>>           ttm_kunit_helpers.o
>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c 
>>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>> index 81661d8827aa..eccc59b981f8 100644
>>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>> @@ -38,10 +38,33 @@ struct ttm_buffer_object 
>>> *ttm_bo_kunit_init(struct kunit *test,
>>>       bo->base = gem_obj;
>>>       bo->bdev = devs->ttm_dev;
>>> +    kref_init(&bo->kref);
>>> +
>>> +    dma_resv_init(&bo->base._resv);
>>> +    bo->base.resv = &bo->base._resv;
>>> +
>>
>> I'm really wondering if we shouldn't now initialize the GEM object 
>> properly?
>>
>> That would also initialize the reservation object if I remember 
>> correctly.
>
> Do you mean by using drm_gem_object_init()?

I think drm_gem_private_object_init is the right function for this, but 
not 100% sure.

>
>>
>> The solution with EXPORT_SYMBOL_FOR_TESTS_ONLY looks really nice I 
>> think and apart from that I can't see anything obviously wrong 
>> either, but I only skimmed over the code.
>
> I'm also glad with EXPORT_SYMBOL_FOR_TESTS_ONLY solution, it's much 
> better now. Right, you can take a closer look at the next version. 
> I'll try to get an actual GEM object here, if you think that's feasible.

I can't promise it, but going to take a look when I have time.

Regards,
Christian.

>
> All the best,
> Karolina
>
>>
>> Regards,
>> Christian.
>>
>>>       return bo;
>>>   }
>>>   EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
>>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>>> +                       uint32_t mem_type, uint32_t flags,
>>> +                       size_t size)
>>> +{
>>> +    struct ttm_place *place;
>>> +
>>> +    place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, place);
>>> +
>>> +    place->mem_type = mem_type;
>>> +    place->flags = flags;
>>> +    place->fpfn = size >> PAGE_SHIFT;
>>> +    place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
>>> +
>>> +    return place;
>>> +}
>>> +EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
>>> +
>>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
>>>   {
>>>       struct ttm_test_devices *devs;
>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h 
>>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>> index e261e3660d0b..f38140f93c05 100644
>>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>> @@ -8,6 +8,7 @@
>>>   #include <drm/drm_drv.h>
>>>   #include <drm/ttm/ttm_device.h>
>>>   #include <drm/ttm/ttm_bo.h>
>>> +#include <drm/ttm/ttm_placement.h>
>>>   #include <drm/drm_kunit_helpers.h>
>>>   #include <kunit/test.h>
>>> @@ -28,6 +29,9 @@ int ttm_device_kunit_init(struct ttm_test_devices 
>>> *priv,
>>>   struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
>>>                           struct ttm_test_devices *devs,
>>>                           size_t size);
>>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>>> +                       uint32_t mem_type, uint32_t flags,
>>> +                       size_t size);
>>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
>>>   struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_resource_test.c 
>>> b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>> new file mode 100644
>>> index 000000000000..851cdc43dc37
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>> @@ -0,0 +1,335 @@
>>> +// SPDX-License-Identifier: GPL-2.0 AND MIT
>>> +/*
>>> + * Copyright © 2023 Intel Corporation
>>> + */
>>> +#include <drm/ttm/ttm_resource.h>
>>> +
>>> +#include "ttm_kunit_helpers.h"
>>> +
>>> +#define RES_SIZE        SZ_4K
>>> +#define TTM_PRIV_DUMMY_REG    (TTM_NUM_MEM_TYPES - 1)
>>> +
>>> +struct ttm_resource_test_case {
>>> +    const char *description;
>>> +    uint32_t mem_type;
>>> +    uint32_t flags;
>>> +};
>>> +
>>> +struct ttm_resource_test_priv {
>>> +    struct ttm_test_devices *devs;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +};
>>> +
>>> +static const struct ttm_resource_manager_func 
>>> ttm_resource_manager_mock_funcs = { };
>>> +
>>> +static int ttm_resource_test_init(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv;
>>> +
>>> +    priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, priv);
>>> +
>>> +    priv->devs = ttm_test_devices_all(test);
>>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs);
>>> +
>>> +    test->priv = priv;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static void ttm_resource_test_fini(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +
>>> +    ttm_test_devices_put(test, priv->devs);
>>> +}
>>> +
>>> +static void ttm_init_test_mocks(struct kunit *test,
>>> +                struct ttm_resource_test_priv *priv,
>>> +                uint32_t mem_type, uint32_t flags)
>>> +{
>>> +    size_t size = RES_SIZE;
>>> +
>>> +    /* Make sure we have what we need for a good BO mock */
>>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs->ttm_dev);
>>> +
>>> +    priv->bo = ttm_bo_kunit_init(test, priv->devs, size);
>>> +    priv->place = ttm_place_kunit_init(test, mem_type, flags, size);
>>> +}
>>> +
>>> +static void ttm_init_test_manager(struct kunit *test,
>>> +                  struct ttm_resource_test_priv *priv,
>>> +                  uint32_t mem_type)
>>> +{
>>> +    struct ttm_device *ttm_dev = priv->devs->ttm_dev;
>>> +    struct ttm_resource_manager *man;
>>> +    size_t size = SZ_16K;
>>> +
>>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>>> +
>>> +    man->use_tt = false;
>>> +    man->func = &ttm_resource_manager_mock_funcs;
>>> +
>>> +    ttm_resource_manager_init(man, ttm_dev, size);
>>> +    ttm_set_driver_manager(ttm_dev, mem_type, man);
>>> +    ttm_resource_manager_set_used(man, true);
>>> +}
>>> +
>>> +static const struct ttm_resource_test_case ttm_resource_cases[] = {
>>> +    {
>>> +        .description = "Init resource in TTM_PL_SYSTEM",
>>> +        .mem_type = TTM_PL_SYSTEM,
>>> +    },
>>> +    {
>>> +        .description = "Init resource in TTM_PL_VRAM",
>>> +        .mem_type = TTM_PL_VRAM,
>>> +    },
>>> +    {
>>> +        .description = "Init resource in a private placement",
>>> +        .mem_type = TTM_PRIV_DUMMY_REG,
>>> +    },
>>> +    {
>>> +        .description = "Init resource in TTM_PL_SYSTEM, set 
>>> placement flags",
>>> +        .mem_type = TTM_PL_SYSTEM,
>>> +        .flags = TTM_PL_FLAG_TOPDOWN,
>>> +    },
>>> +};
>>> +
>>> +static void ttm_resource_case_desc(const struct 
>>> ttm_resource_test_case *t, char *desc)
>>> +{
>>> +    strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
>>> +}
>>> +
>>> +KUNIT_ARRAY_PARAM(ttm_resource, ttm_resource_cases, 
>>> ttm_resource_case_desc);
>>> +
>>> +static void ttm_resource_init_basic(struct kunit *test)
>>> +{
>>> +    const struct ttm_resource_test_case *params = test->param_value;
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +    uint64_t expected_usage;
>>> +
>>> +    ttm_init_test_mocks(test, priv, params->mem_type, params->flags);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    if (params->mem_type > TTM_PL_SYSTEM)
>>> +        ttm_init_test_manager(test, priv, params->mem_type);
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +    expected_usage = man->usage + RES_SIZE;
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>>> +
>>> +    ttm_resource_init(bo, place, res);
>>> +
>>> +    KUNIT_ASSERT_EQ(test, res->start, 0);
>>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>>> +    KUNIT_ASSERT_EQ(test, res->mem_type, place->mem_type);
>>> +    KUNIT_ASSERT_EQ(test, res->placement, place->flags);
>>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>>> +
>>> +    KUNIT_ASSERT_NULL(test, res->bus.addr);
>>> +    KUNIT_ASSERT_EQ(test, res->bus.offset, 0);
>>> +    KUNIT_ASSERT_FALSE(test, res->bus.is_iomem);
>>> +    KUNIT_ASSERT_EQ(test, res->bus.caching, ttm_cached);
>>> +    KUNIT_ASSERT_EQ(test, man->usage, expected_usage);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, 
>>> list_is_singular(&man->lru[bo->priority]));
>>> +
>>> +    ttm_resource_fini(man, res);
>>> +}
>>> +
>>> +static void ttm_resource_init_pinned(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +
>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>>> +
>>> +    dma_resv_lock(bo->base.resv, NULL);
>>> +    ttm_bo_pin(bo);
>>> +    ttm_resource_init(bo, place, res);
>>> +    KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
>>> +
>>> +    ttm_bo_unpin(bo);
>>> +    ttm_resource_fini(man, res);
>>> +    dma_resv_unlock(bo->base.resv);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>>> +}
>>> +
>>> +static void ttm_resource_fini_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +
>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    ttm_resource_init(bo, place, res);
>>> +    ttm_resource_fini(man, res);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&res->lru));
>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>> +}
>>> +
>>> +static void ttm_resource_manager_init_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +    size_t size = SZ_16K;
>>> +
>>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>>> +
>>> +    ttm_resource_manager_init(man, priv->devs->ttm_dev, size);
>>> +
>>> +    KUNIT_ASSERT_PTR_EQ(test, man->bdev, priv->devs->ttm_dev);
>>> +    KUNIT_ASSERT_EQ(test, man->size, size);
>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>> +    KUNIT_ASSERT_NULL(test, man->move);
>>> +    KUNIT_ASSERT_NOT_NULL(test, &man->move_lock);
>>> +
>>> +    for (int i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
>>> +        KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[i]));
>>> +}
>>> +
>>> +static void ttm_resource_manager_usage_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +    uint64_t actual_usage;
>>> +
>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 
>>> TTM_PL_FLAG_TOPDOWN);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +
>>> +    ttm_resource_init(bo, place, res);
>>> +    actual_usage = ttm_resource_manager_usage(man);
>>> +
>>> +    KUNIT_ASSERT_EQ(test, actual_usage, RES_SIZE);
>>> +
>>> +    ttm_resource_fini(man, res);
>>> +}
>>> +
>>> +static void ttm_resource_manager_set_used_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, TTM_PL_SYSTEM);
>>> +    KUNIT_ASSERT_TRUE(test, man->use_type);
>>> +
>>> +    ttm_resource_manager_set_used(man, false);
>>> +    KUNIT_ASSERT_FALSE(test, man->use_type);
>>> +}
>>> +
>>> +static void ttm_sys_man_alloc_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource *res;
>>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>>> +    int ret;
>>> +
>>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>>> +    ret = man->func->alloc(man, bo, place, &res);
>>> +
>>> +    KUNIT_ASSERT_EQ(test, ret, 0);
>>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>>> +    KUNIT_ASSERT_EQ(test, res->mem_type, mem_type);
>>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>>> +
>>> +    ttm_resource_fini(man, res);
>>> +}
>>> +
>>> +static void ttm_sys_man_free_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource *res;
>>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>>> +
>>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    ttm_resource_alloc(bo, place, &res);
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>>> +    man->func->free(man, res);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>> +}
>>> +
>>> +static struct kunit_case ttm_resource_test_cases[] = {
>>> +    KUNIT_CASE_PARAM(ttm_resource_init_basic, 
>>> ttm_resource_gen_params),
>>> +    KUNIT_CASE(ttm_resource_init_pinned),
>>> +    KUNIT_CASE(ttm_resource_fini_basic),
>>> +    KUNIT_CASE(ttm_resource_manager_init_basic),
>>> +    KUNIT_CASE(ttm_resource_manager_usage_basic),
>>> +    KUNIT_CASE(ttm_resource_manager_set_used_basic),
>>> +    KUNIT_CASE(ttm_sys_man_alloc_basic),
>>> +    KUNIT_CASE(ttm_sys_man_free_basic),
>>> +    {}
>>> +};
>>> +
>>> +static struct kunit_suite ttm_resource_test_suite = {
>>> +    .name = "ttm_resource",
>>> +    .init = ttm_resource_test_init,
>>> +    .exit = ttm_resource_test_fini,
>>> +    .test_cases = ttm_resource_test_cases,
>>> +};
>>> +
>>> +kunit_test_suites(&ttm_resource_test_suite);
>>> +
>>> +MODULE_LICENSE("GPL");
>>> diff --git a/drivers/gpu/drm/ttm/ttm_resource.c 
>>> b/drivers/gpu/drm/ttm/ttm_resource.c
>>> index 46ff9c75bb12..02b96d23fdb9 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_resource.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_resource.c
>>> @@ -30,6 +30,8 @@
>>>   #include <drm/ttm/ttm_placement.h>
>>>   #include <drm/ttm/ttm_resource.h>
>>> +#include <drm/drm_util.h>
>>> +
>>>   /**
>>>    * ttm_lru_bulk_move_init - initialize a bulk move structure
>>>    * @bulk: the structure to init
>>> @@ -240,6 +242,7 @@ int ttm_resource_alloc(struct ttm_buffer_object 
>>> *bo,
>>>       spin_unlock(&bo->bdev->lru_lock);
>>>       return 0;
>>>   }
>>> +EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
>>>   void ttm_resource_free(struct ttm_buffer_object *bo, struct 
>>> ttm_resource **res)
>>>   {
>>

Re: [PATCH v3 1/4] drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man

[Karolina Stolarek]

On 18.09.2023 13:48, Karolina Stolarek wrote:
> On 12.09.2023 14:54, Christian König wrote:
>> Am 12.09.23 um 13:49 schrieb Karolina Stolarek:
>>> Test initialization of ttm_resource using different memory domains.
>>> Add tests for a system memory manager and functions that can be
>>> tested without a fully-featured resource manager. Update
>>> ttm_bo_kunit_init() to initialize BO's kref and reservation object.
>>> Export ttm_resource_alloc symbol for test purposes only.
>>>
>>> Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
>>> ---
>>>   drivers/gpu/drm/ttm/tests/Makefile            |   1 +
>>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  23 ++
>>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
>>>   drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 ++++++++++++++++++
>>>   drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
>>>   5 files changed, 366 insertions(+)
>>>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>>
>>> diff --git a/drivers/gpu/drm/ttm/tests/Makefile 
>>> b/drivers/gpu/drm/ttm/tests/Makefile
>>> index ec87c4fc1ad5..c92fe2052ef6 100644
>>> --- a/drivers/gpu/drm/ttm/tests/Makefile
>>> +++ b/drivers/gpu/drm/ttm/tests/Makefile
>>> @@ -3,4 +3,5 @@
>>>   obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
>>>           ttm_device_test.o \
>>>           ttm_pool_test.o \
>>> +        ttm_resource_test.o \
>>>           ttm_kunit_helpers.o
>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c 
>>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>> index 81661d8827aa..eccc59b981f8 100644
>>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>> @@ -38,10 +38,33 @@ struct ttm_buffer_object 
>>> *ttm_bo_kunit_init(struct kunit *test,
>>>       bo->base = gem_obj;
>>>       bo->bdev = devs->ttm_dev;
>>> +    kref_init(&bo->kref);
>>> +
>>> +    dma_resv_init(&bo->base._resv);
>>> +    bo->base.resv = &bo->base._resv;
>>> +
>>
>> I'm really wondering if we shouldn't now initialize the GEM object 
>> properly?
>>
>> That would also initialize the reservation object if I remember 
>> correctly.
> 
> Do you mean by using drm_gem_object_init()?

I tried initializing bo.base with drm_gem_object_init() and it's looking 
good, but one check in that function makes testing of "Misaligned size" 
subtest of ttm_tt_init_basic impossible:

BUG_ON((size & (PAGE_SIZE - 1)) != 0);

I wanted to test if ttm_tt_init properly calculates the number of pages, 
but it looks like in the normal circuimstances it already gets a GEM 
object of a size that is page-aligned. Would you prefer to write this 
subtest as a separate test with a dummy misaligned GEM object, or to 
delete this subtest altogether?

Many thanks,
Karolina

> 
>>
>> The solution with EXPORT_SYMBOL_FOR_TESTS_ONLY looks really nice I 
>> think and apart from that I can't see anything obviously wrong either, 
>> but I only skimmed over the code.
> 
> I'm also glad with EXPORT_SYMBOL_FOR_TESTS_ONLY solution, it's much 
> better now. Right, you can take a closer look at the next version. I'll 
> try to get an actual GEM object here, if you think that's feasible.
> 
> All the best,
> Karolina
> 
>>
>> Regards,
>> Christian.
>>
>>>       return bo;
>>>   }
>>>   EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
>>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>>> +                       uint32_t mem_type, uint32_t flags,
>>> +                       size_t size)
>>> +{
>>> +    struct ttm_place *place;
>>> +
>>> +    place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, place);
>>> +
>>> +    place->mem_type = mem_type;
>>> +    place->flags = flags;
>>> +    place->fpfn = size >> PAGE_SHIFT;
>>> +    place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
>>> +
>>> +    return place;
>>> +}
>>> +EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
>>> +
>>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
>>>   {
>>>       struct ttm_test_devices *devs;
>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h 
>>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>> index e261e3660d0b..f38140f93c05 100644
>>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>> @@ -8,6 +8,7 @@
>>>   #include <drm/drm_drv.h>
>>>   #include <drm/ttm/ttm_device.h>
>>>   #include <drm/ttm/ttm_bo.h>
>>> +#include <drm/ttm/ttm_placement.h>
>>>   #include <drm/drm_kunit_helpers.h>
>>>   #include <kunit/test.h>
>>> @@ -28,6 +29,9 @@ int ttm_device_kunit_init(struct ttm_test_devices 
>>> *priv,
>>>   struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
>>>                           struct ttm_test_devices *devs,
>>>                           size_t size);
>>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>>> +                       uint32_t mem_type, uint32_t flags,
>>> +                       size_t size);
>>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
>>>   struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_resource_test.c 
>>> b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>> new file mode 100644
>>> index 000000000000..851cdc43dc37
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>> @@ -0,0 +1,335 @@
>>> +// SPDX-License-Identifier: GPL-2.0 AND MIT
>>> +/*
>>> + * Copyright © 2023 Intel Corporation
>>> + */
>>> +#include <drm/ttm/ttm_resource.h>
>>> +
>>> +#include "ttm_kunit_helpers.h"
>>> +
>>> +#define RES_SIZE        SZ_4K
>>> +#define TTM_PRIV_DUMMY_REG    (TTM_NUM_MEM_TYPES - 1)
>>> +
>>> +struct ttm_resource_test_case {
>>> +    const char *description;
>>> +    uint32_t mem_type;
>>> +    uint32_t flags;
>>> +};
>>> +
>>> +struct ttm_resource_test_priv {
>>> +    struct ttm_test_devices *devs;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +};
>>> +
>>> +static const struct ttm_resource_manager_func 
>>> ttm_resource_manager_mock_funcs = { };
>>> +
>>> +static int ttm_resource_test_init(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv;
>>> +
>>> +    priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, priv);
>>> +
>>> +    priv->devs = ttm_test_devices_all(test);
>>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs);
>>> +
>>> +    test->priv = priv;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static void ttm_resource_test_fini(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +
>>> +    ttm_test_devices_put(test, priv->devs);
>>> +}
>>> +
>>> +static void ttm_init_test_mocks(struct kunit *test,
>>> +                struct ttm_resource_test_priv *priv,
>>> +                uint32_t mem_type, uint32_t flags)
>>> +{
>>> +    size_t size = RES_SIZE;
>>> +
>>> +    /* Make sure we have what we need for a good BO mock */
>>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs->ttm_dev);
>>> +
>>> +    priv->bo = ttm_bo_kunit_init(test, priv->devs, size);
>>> +    priv->place = ttm_place_kunit_init(test, mem_type, flags, size);
>>> +}
>>> +
>>> +static void ttm_init_test_manager(struct kunit *test,
>>> +                  struct ttm_resource_test_priv *priv,
>>> +                  uint32_t mem_type)
>>> +{
>>> +    struct ttm_device *ttm_dev = priv->devs->ttm_dev;
>>> +    struct ttm_resource_manager *man;
>>> +    size_t size = SZ_16K;
>>> +
>>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>>> +
>>> +    man->use_tt = false;
>>> +    man->func = &ttm_resource_manager_mock_funcs;
>>> +
>>> +    ttm_resource_manager_init(man, ttm_dev, size);
>>> +    ttm_set_driver_manager(ttm_dev, mem_type, man);
>>> +    ttm_resource_manager_set_used(man, true);
>>> +}
>>> +
>>> +static const struct ttm_resource_test_case ttm_resource_cases[] = {
>>> +    {
>>> +        .description = "Init resource in TTM_PL_SYSTEM",
>>> +        .mem_type = TTM_PL_SYSTEM,
>>> +    },
>>> +    {
>>> +        .description = "Init resource in TTM_PL_VRAM",
>>> +        .mem_type = TTM_PL_VRAM,
>>> +    },
>>> +    {
>>> +        .description = "Init resource in a private placement",
>>> +        .mem_type = TTM_PRIV_DUMMY_REG,
>>> +    },
>>> +    {
>>> +        .description = "Init resource in TTM_PL_SYSTEM, set 
>>> placement flags",
>>> +        .mem_type = TTM_PL_SYSTEM,
>>> +        .flags = TTM_PL_FLAG_TOPDOWN,
>>> +    },
>>> +};
>>> +
>>> +static void ttm_resource_case_desc(const struct 
>>> ttm_resource_test_case *t, char *desc)
>>> +{
>>> +    strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
>>> +}
>>> +
>>> +KUNIT_ARRAY_PARAM(ttm_resource, ttm_resource_cases, 
>>> ttm_resource_case_desc);
>>> +
>>> +static void ttm_resource_init_basic(struct kunit *test)
>>> +{
>>> +    const struct ttm_resource_test_case *params = test->param_value;
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +    uint64_t expected_usage;
>>> +
>>> +    ttm_init_test_mocks(test, priv, params->mem_type, params->flags);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    if (params->mem_type > TTM_PL_SYSTEM)
>>> +        ttm_init_test_manager(test, priv, params->mem_type);
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +    expected_usage = man->usage + RES_SIZE;
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>>> +
>>> +    ttm_resource_init(bo, place, res);
>>> +
>>> +    KUNIT_ASSERT_EQ(test, res->start, 0);
>>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>>> +    KUNIT_ASSERT_EQ(test, res->mem_type, place->mem_type);
>>> +    KUNIT_ASSERT_EQ(test, res->placement, place->flags);
>>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>>> +
>>> +    KUNIT_ASSERT_NULL(test, res->bus.addr);
>>> +    KUNIT_ASSERT_EQ(test, res->bus.offset, 0);
>>> +    KUNIT_ASSERT_FALSE(test, res->bus.is_iomem);
>>> +    KUNIT_ASSERT_EQ(test, res->bus.caching, ttm_cached);
>>> +    KUNIT_ASSERT_EQ(test, man->usage, expected_usage);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_is_singular(&man->lru[bo->priority]));
>>> +
>>> +    ttm_resource_fini(man, res);
>>> +}
>>> +
>>> +static void ttm_resource_init_pinned(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +
>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>>> +
>>> +    dma_resv_lock(bo->base.resv, NULL);
>>> +    ttm_bo_pin(bo);
>>> +    ttm_resource_init(bo, place, res);
>>> +    KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
>>> +
>>> +    ttm_bo_unpin(bo);
>>> +    ttm_resource_fini(man, res);
>>> +    dma_resv_unlock(bo->base.resv);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>>> +}
>>> +
>>> +static void ttm_resource_fini_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +
>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    ttm_resource_init(bo, place, res);
>>> +    ttm_resource_fini(man, res);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&res->lru));
>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>> +}
>>> +
>>> +static void ttm_resource_manager_init_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +    size_t size = SZ_16K;
>>> +
>>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>>> +
>>> +    ttm_resource_manager_init(man, priv->devs->ttm_dev, size);
>>> +
>>> +    KUNIT_ASSERT_PTR_EQ(test, man->bdev, priv->devs->ttm_dev);
>>> +    KUNIT_ASSERT_EQ(test, man->size, size);
>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>> +    KUNIT_ASSERT_NULL(test, man->move);
>>> +    KUNIT_ASSERT_NOT_NULL(test, &man->move_lock);
>>> +
>>> +    for (int i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
>>> +        KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[i]));
>>> +}
>>> +
>>> +static void ttm_resource_manager_usage_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource *res;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource_manager *man;
>>> +    uint64_t actual_usage;
>>> +
>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 
>>> TTM_PL_FLAG_TOPDOWN);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>> +
>>> +    ttm_resource_init(bo, place, res);
>>> +    actual_usage = ttm_resource_manager_usage(man);
>>> +
>>> +    KUNIT_ASSERT_EQ(test, actual_usage, RES_SIZE);
>>> +
>>> +    ttm_resource_fini(man, res);
>>> +}
>>> +
>>> +static void ttm_resource_manager_set_used_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, TTM_PL_SYSTEM);
>>> +    KUNIT_ASSERT_TRUE(test, man->use_type);
>>> +
>>> +    ttm_resource_manager_set_used(man, false);
>>> +    KUNIT_ASSERT_FALSE(test, man->use_type);
>>> +}
>>> +
>>> +static void ttm_sys_man_alloc_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource *res;
>>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>>> +    int ret;
>>> +
>>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>>> +    ret = man->func->alloc(man, bo, place, &res);
>>> +
>>> +    KUNIT_ASSERT_EQ(test, ret, 0);
>>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>>> +    KUNIT_ASSERT_EQ(test, res->mem_type, mem_type);
>>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>>> +
>>> +    ttm_resource_fini(man, res);
>>> +}
>>> +
>>> +static void ttm_sys_man_free_basic(struct kunit *test)
>>> +{
>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>> +    struct ttm_resource_manager *man;
>>> +    struct ttm_buffer_object *bo;
>>> +    struct ttm_place *place;
>>> +    struct ttm_resource *res;
>>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>>> +
>>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>>> +    bo = priv->bo;
>>> +    place = priv->place;
>>> +
>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>> +
>>> +    ttm_resource_alloc(bo, place, &res);
>>> +
>>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>>> +    man->func->free(man, res);
>>> +
>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>> +}
>>> +
>>> +static struct kunit_case ttm_resource_test_cases[] = {
>>> +    KUNIT_CASE_PARAM(ttm_resource_init_basic, ttm_resource_gen_params),
>>> +    KUNIT_CASE(ttm_resource_init_pinned),
>>> +    KUNIT_CASE(ttm_resource_fini_basic),
>>> +    KUNIT_CASE(ttm_resource_manager_init_basic),
>>> +    KUNIT_CASE(ttm_resource_manager_usage_basic),
>>> +    KUNIT_CASE(ttm_resource_manager_set_used_basic),
>>> +    KUNIT_CASE(ttm_sys_man_alloc_basic),
>>> +    KUNIT_CASE(ttm_sys_man_free_basic),
>>> +    {}
>>> +};
>>> +
>>> +static struct kunit_suite ttm_resource_test_suite = {
>>> +    .name = "ttm_resource",
>>> +    .init = ttm_resource_test_init,
>>> +    .exit = ttm_resource_test_fini,
>>> +    .test_cases = ttm_resource_test_cases,
>>> +};
>>> +
>>> +kunit_test_suites(&ttm_resource_test_suite);
>>> +
>>> +MODULE_LICENSE("GPL");
>>> diff --git a/drivers/gpu/drm/ttm/ttm_resource.c 
>>> b/drivers/gpu/drm/ttm/ttm_resource.c
>>> index 46ff9c75bb12..02b96d23fdb9 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_resource.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_resource.c
>>> @@ -30,6 +30,8 @@
>>>   #include <drm/ttm/ttm_placement.h>
>>>   #include <drm/ttm/ttm_resource.h>
>>> +#include <drm/drm_util.h>
>>> +
>>>   /**
>>>    * ttm_lru_bulk_move_init - initialize a bulk move structure
>>>    * @bulk: the structure to init
>>> @@ -240,6 +242,7 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
>>>       spin_unlock(&bo->bdev->lru_lock);
>>>       return 0;
>>>   }
>>> +EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
>>>   void ttm_resource_free(struct ttm_buffer_object *bo, struct 
>>> ttm_resource **res)
>>>   {
>>

Re: [PATCH v3 1/4] drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man

[Karolina Stolarek]

On 18.09.2023 14:45, Christian König wrote:
> Am 18.09.23 um 13:48 schrieb Karolina Stolarek:
>> On 12.09.2023 14:54, Christian König wrote:
>>> Am 12.09.23 um 13:49 schrieb Karolina Stolarek:
>>>> Test initialization of ttm_resource using different memory domains.
>>>> Add tests for a system memory manager and functions that can be
>>>> tested without a fully-featured resource manager. Update
>>>> ttm_bo_kunit_init() to initialize BO's kref and reservation object.
>>>> Export ttm_resource_alloc symbol for test purposes only.
>>>>
>>>> Signed-off-by: Karolina Stolarek <karolina.stolarek@intel.com>
>>>> ---
>>>>   drivers/gpu/drm/ttm/tests/Makefile            |   1 +
>>>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  23 ++
>>>>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
>>>>   drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 
>>>> ++++++++++++++++++
>>>>   drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
>>>>   5 files changed, 366 insertions(+)
>>>>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>>>
>>>> diff --git a/drivers/gpu/drm/ttm/tests/Makefile 
>>>> b/drivers/gpu/drm/ttm/tests/Makefile
>>>> index ec87c4fc1ad5..c92fe2052ef6 100644
>>>> --- a/drivers/gpu/drm/ttm/tests/Makefile
>>>> +++ b/drivers/gpu/drm/ttm/tests/Makefile
>>>> @@ -3,4 +3,5 @@
>>>>   obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
>>>>           ttm_device_test.o \
>>>>           ttm_pool_test.o \
>>>> +        ttm_resource_test.o \
>>>>           ttm_kunit_helpers.o
>>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c 
>>>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>>> index 81661d8827aa..eccc59b981f8 100644
>>>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
>>>> @@ -38,10 +38,33 @@ struct ttm_buffer_object 
>>>> *ttm_bo_kunit_init(struct kunit *test,
>>>>       bo->base = gem_obj;
>>>>       bo->bdev = devs->ttm_dev;
>>>> +    kref_init(&bo->kref);
>>>> +
>>>> +    dma_resv_init(&bo->base._resv);
>>>> +    bo->base.resv = &bo->base._resv;
>>>> +
>>>
>>> I'm really wondering if we shouldn't now initialize the GEM object 
>>> properly?
>>>
>>> That would also initialize the reservation object if I remember 
>>> correctly.
>>
>> Do you mean by using drm_gem_object_init()?
> 
> I think drm_gem_private_object_init is the right function for this, but 
> not 100% sure.
> 
>>
>>>
>>> The solution with EXPORT_SYMBOL_FOR_TESTS_ONLY looks really nice I 
>>> think and apart from that I can't see anything obviously wrong 
>>> either, but I only skimmed over the code.
>>
>> I'm also glad with EXPORT_SYMBOL_FOR_TESTS_ONLY solution, it's much 
>> better now. Right, you can take a closer look at the next version. 
>> I'll try to get an actual GEM object here, if you think that's feasible.
> 
> I can't promise it, but going to take a look when I have time.

I understand. I'm still looking at this, because I found lockdep 
warnings in ttm_bo_reserve_deadlock and ttm_bo_reserve_double_resv. Be 
cautious when reviewing my code, I left some traps there...

The good news is that "real" GEM objects work fine in the tests and I 
found a way to keep the misaligned test case for ttm_tt_init.

Many thanks,
Karolina

> 
> Regards,
> Christian.
> 
>>
>> All the best,
>> Karolina
>>
>>>
>>> Regards,
>>> Christian.
>>>
>>>>       return bo;
>>>>   }
>>>>   EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
>>>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>>>> +                       uint32_t mem_type, uint32_t flags,
>>>> +                       size_t size)
>>>> +{
>>>> +    struct ttm_place *place;
>>>> +
>>>> +    place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, place);
>>>> +
>>>> +    place->mem_type = mem_type;
>>>> +    place->flags = flags;
>>>> +    place->fpfn = size >> PAGE_SHIFT;
>>>> +    place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
>>>> +
>>>> +    return place;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
>>>> +
>>>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
>>>>   {
>>>>       struct ttm_test_devices *devs;
>>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h 
>>>> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>>> index e261e3660d0b..f38140f93c05 100644
>>>> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
>>>> @@ -8,6 +8,7 @@
>>>>   #include <drm/drm_drv.h>
>>>>   #include <drm/ttm/ttm_device.h>
>>>>   #include <drm/ttm/ttm_bo.h>
>>>> +#include <drm/ttm/ttm_placement.h>
>>>>   #include <drm/drm_kunit_helpers.h>
>>>>   #include <kunit/test.h>
>>>> @@ -28,6 +29,9 @@ int ttm_device_kunit_init(struct ttm_test_devices 
>>>> *priv,
>>>>   struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
>>>>                           struct ttm_test_devices *devs,
>>>>                           size_t size);
>>>> +struct ttm_place *ttm_place_kunit_init(struct kunit *test,
>>>> +                       uint32_t mem_type, uint32_t flags,
>>>> +                       size_t size);
>>>>   struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
>>>>   struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
>>>> diff --git a/drivers/gpu/drm/ttm/tests/ttm_resource_test.c 
>>>> b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>>> new file mode 100644
>>>> index 000000000000..851cdc43dc37
>>>> --- /dev/null
>>>> +++ b/drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>>>> @@ -0,0 +1,335 @@
>>>> +// SPDX-License-Identifier: GPL-2.0 AND MIT
>>>> +/*
>>>> + * Copyright © 2023 Intel Corporation
>>>> + */
>>>> +#include <drm/ttm/ttm_resource.h>
>>>> +
>>>> +#include "ttm_kunit_helpers.h"
>>>> +
>>>> +#define RES_SIZE        SZ_4K
>>>> +#define TTM_PRIV_DUMMY_REG    (TTM_NUM_MEM_TYPES - 1)
>>>> +
>>>> +struct ttm_resource_test_case {
>>>> +    const char *description;
>>>> +    uint32_t mem_type;
>>>> +    uint32_t flags;
>>>> +};
>>>> +
>>>> +struct ttm_resource_test_priv {
>>>> +    struct ttm_test_devices *devs;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +};
>>>> +
>>>> +static const struct ttm_resource_manager_func 
>>>> ttm_resource_manager_mock_funcs = { };
>>>> +
>>>> +static int ttm_resource_test_init(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv;
>>>> +
>>>> +    priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, priv);
>>>> +
>>>> +    priv->devs = ttm_test_devices_all(test);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs);
>>>> +
>>>> +    test->priv = priv;
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>> +static void ttm_resource_test_fini(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +
>>>> +    ttm_test_devices_put(test, priv->devs);
>>>> +}
>>>> +
>>>> +static void ttm_init_test_mocks(struct kunit *test,
>>>> +                struct ttm_resource_test_priv *priv,
>>>> +                uint32_t mem_type, uint32_t flags)
>>>> +{
>>>> +    size_t size = RES_SIZE;
>>>> +
>>>> +    /* Make sure we have what we need for a good BO mock */
>>>> +    KUNIT_ASSERT_NOT_NULL(test, priv->devs->ttm_dev);
>>>> +
>>>> +    priv->bo = ttm_bo_kunit_init(test, priv->devs, size);
>>>> +    priv->place = ttm_place_kunit_init(test, mem_type, flags, size);
>>>> +}
>>>> +
>>>> +static void ttm_init_test_manager(struct kunit *test,
>>>> +                  struct ttm_resource_test_priv *priv,
>>>> +                  uint32_t mem_type)
>>>> +{
>>>> +    struct ttm_device *ttm_dev = priv->devs->ttm_dev;
>>>> +    struct ttm_resource_manager *man;
>>>> +    size_t size = SZ_16K;
>>>> +
>>>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>>>> +
>>>> +    man->use_tt = false;
>>>> +    man->func = &ttm_resource_manager_mock_funcs;
>>>> +
>>>> +    ttm_resource_manager_init(man, ttm_dev, size);
>>>> +    ttm_set_driver_manager(ttm_dev, mem_type, man);
>>>> +    ttm_resource_manager_set_used(man, true);
>>>> +}
>>>> +
>>>> +static const struct ttm_resource_test_case ttm_resource_cases[] = {
>>>> +    {
>>>> +        .description = "Init resource in TTM_PL_SYSTEM",
>>>> +        .mem_type = TTM_PL_SYSTEM,
>>>> +    },
>>>> +    {
>>>> +        .description = "Init resource in TTM_PL_VRAM",
>>>> +        .mem_type = TTM_PL_VRAM,
>>>> +    },
>>>> +    {
>>>> +        .description = "Init resource in a private placement",
>>>> +        .mem_type = TTM_PRIV_DUMMY_REG,
>>>> +    },
>>>> +    {
>>>> +        .description = "Init resource in TTM_PL_SYSTEM, set 
>>>> placement flags",
>>>> +        .mem_type = TTM_PL_SYSTEM,
>>>> +        .flags = TTM_PL_FLAG_TOPDOWN,
>>>> +    },
>>>> +};
>>>> +
>>>> +static void ttm_resource_case_desc(const struct 
>>>> ttm_resource_test_case *t, char *desc)
>>>> +{
>>>> +    strscpy(desc, t->description, KUNIT_PARAM_DESC_SIZE);
>>>> +}
>>>> +
>>>> +KUNIT_ARRAY_PARAM(ttm_resource, ttm_resource_cases, 
>>>> ttm_resource_case_desc);
>>>> +
>>>> +static void ttm_resource_init_basic(struct kunit *test)
>>>> +{
>>>> +    const struct ttm_resource_test_case *params = test->param_value;
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource *res;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +    struct ttm_resource_manager *man;
>>>> +    uint64_t expected_usage;
>>>> +
>>>> +    ttm_init_test_mocks(test, priv, params->mem_type, params->flags);
>>>> +    bo = priv->bo;
>>>> +    place = priv->place;
>>>> +
>>>> +    if (params->mem_type > TTM_PL_SYSTEM)
>>>> +        ttm_init_test_manager(test, priv, params->mem_type);
>>>> +
>>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>>> +    expected_usage = man->usage + RES_SIZE;
>>>> +
>>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>>>> +
>>>> +    ttm_resource_init(bo, place, res);
>>>> +
>>>> +    KUNIT_ASSERT_EQ(test, res->start, 0);
>>>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>>>> +    KUNIT_ASSERT_EQ(test, res->mem_type, place->mem_type);
>>>> +    KUNIT_ASSERT_EQ(test, res->placement, place->flags);
>>>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>>>> +
>>>> +    KUNIT_ASSERT_NULL(test, res->bus.addr);
>>>> +    KUNIT_ASSERT_EQ(test, res->bus.offset, 0);
>>>> +    KUNIT_ASSERT_FALSE(test, res->bus.is_iomem);
>>>> +    KUNIT_ASSERT_EQ(test, res->bus.caching, ttm_cached);
>>>> +    KUNIT_ASSERT_EQ(test, man->usage, expected_usage);
>>>> +
>>>> +    KUNIT_ASSERT_TRUE(test, 
>>>> list_is_singular(&man->lru[bo->priority]));
>>>> +
>>>> +    ttm_resource_fini(man, res);
>>>> +}
>>>> +
>>>> +static void ttm_resource_init_pinned(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource *res;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +    struct ttm_resource_manager *man;
>>>> +
>>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>>>> +    bo = priv->bo;
>>>> +    place = priv->place;
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>>> +
>>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>>>> +
>>>> +    dma_resv_lock(bo->base.resv, NULL);
>>>> +    ttm_bo_pin(bo);
>>>> +    ttm_resource_init(bo, place, res);
>>>> +    KUNIT_ASSERT_TRUE(test, list_is_singular(&bo->bdev->pinned));
>>>> +
>>>> +    ttm_bo_unpin(bo);
>>>> +    ttm_resource_fini(man, res);
>>>> +    dma_resv_unlock(bo->base.resv);
>>>> +
>>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&bo->bdev->pinned));
>>>> +}
>>>> +
>>>> +static void ttm_resource_fini_basic(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource *res;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +    struct ttm_resource_manager *man;
>>>> +
>>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 0);
>>>> +    bo = priv->bo;
>>>> +    place = priv->place;
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>>> +
>>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>>> +
>>>> +    ttm_resource_init(bo, place, res);
>>>> +    ttm_resource_fini(man, res);
>>>> +
>>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&res->lru));
>>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>>> +}
>>>> +
>>>> +static void ttm_resource_manager_init_basic(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource_manager *man;
>>>> +    size_t size = SZ_16K;
>>>> +
>>>> +    man = kunit_kzalloc(test, sizeof(*man), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, man);
>>>> +
>>>> +    ttm_resource_manager_init(man, priv->devs->ttm_dev, size);
>>>> +
>>>> +    KUNIT_ASSERT_PTR_EQ(test, man->bdev, priv->devs->ttm_dev);
>>>> +    KUNIT_ASSERT_EQ(test, man->size, size);
>>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>>> +    KUNIT_ASSERT_NULL(test, man->move);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, &man->move_lock);
>>>> +
>>>> +    for (int i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
>>>> +        KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[i]));
>>>> +}
>>>> +
>>>> +static void ttm_resource_manager_usage_basic(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource *res;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +    struct ttm_resource_manager *man;
>>>> +    uint64_t actual_usage;
>>>> +
>>>> +    ttm_init_test_mocks(test, priv, TTM_PL_SYSTEM, 
>>>> TTM_PL_FLAG_TOPDOWN);
>>>> +    bo = priv->bo;
>>>> +    place = priv->place;
>>>> +
>>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, place->mem_type);
>>>> +
>>>> +    ttm_resource_init(bo, place, res);
>>>> +    actual_usage = ttm_resource_manager_usage(man);
>>>> +
>>>> +    KUNIT_ASSERT_EQ(test, actual_usage, RES_SIZE);
>>>> +
>>>> +    ttm_resource_fini(man, res);
>>>> +}
>>>> +
>>>> +static void ttm_resource_manager_set_used_basic(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource_manager *man;
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, TTM_PL_SYSTEM);
>>>> +    KUNIT_ASSERT_TRUE(test, man->use_type);
>>>> +
>>>> +    ttm_resource_manager_set_used(man, false);
>>>> +    KUNIT_ASSERT_FALSE(test, man->use_type);
>>>> +}
>>>> +
>>>> +static void ttm_sys_man_alloc_basic(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource_manager *man;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +    struct ttm_resource *res;
>>>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>>>> +    int ret;
>>>> +
>>>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>>>> +    bo = priv->bo;
>>>> +    place = priv->place;
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>>>> +    ret = man->func->alloc(man, bo, place, &res);
>>>> +
>>>> +    KUNIT_ASSERT_EQ(test, ret, 0);
>>>> +    KUNIT_ASSERT_EQ(test, res->size, RES_SIZE);
>>>> +    KUNIT_ASSERT_EQ(test, res->mem_type, mem_type);
>>>> +    KUNIT_ASSERT_PTR_EQ(test, res->bo, bo);
>>>> +
>>>> +    ttm_resource_fini(man, res);
>>>> +}
>>>> +
>>>> +static void ttm_sys_man_free_basic(struct kunit *test)
>>>> +{
>>>> +    struct ttm_resource_test_priv *priv = test->priv;
>>>> +    struct ttm_resource_manager *man;
>>>> +    struct ttm_buffer_object *bo;
>>>> +    struct ttm_place *place;
>>>> +    struct ttm_resource *res;
>>>> +    uint32_t mem_type = TTM_PL_SYSTEM;
>>>> +
>>>> +    ttm_init_test_mocks(test, priv, mem_type, 0);
>>>> +    bo = priv->bo;
>>>> +    place = priv->place;
>>>> +
>>>> +    res = kunit_kzalloc(test, sizeof(*res), GFP_KERNEL);
>>>> +    KUNIT_ASSERT_NOT_NULL(test, res);
>>>> +
>>>> +    ttm_resource_alloc(bo, place, &res);
>>>> +
>>>> +    man = ttm_manager_type(priv->devs->ttm_dev, mem_type);
>>>> +    man->func->free(man, res);
>>>> +
>>>> +    KUNIT_ASSERT_TRUE(test, list_empty(&man->lru[bo->priority]));
>>>> +    KUNIT_ASSERT_EQ(test, man->usage, 0);
>>>> +}
>>>> +
>>>> +static struct kunit_case ttm_resource_test_cases[] = {
>>>> +    KUNIT_CASE_PARAM(ttm_resource_init_basic, 
>>>> ttm_resource_gen_params),
>>>> +    KUNIT_CASE(ttm_resource_init_pinned),
>>>> +    KUNIT_CASE(ttm_resource_fini_basic),
>>>> +    KUNIT_CASE(ttm_resource_manager_init_basic),
>>>> +    KUNIT_CASE(ttm_resource_manager_usage_basic),
>>>> +    KUNIT_CASE(ttm_resource_manager_set_used_basic),
>>>> +    KUNIT_CASE(ttm_sys_man_alloc_basic),
>>>> +    KUNIT_CASE(ttm_sys_man_free_basic),
>>>> +    {}
>>>> +};
>>>> +
>>>> +static struct kunit_suite ttm_resource_test_suite = {
>>>> +    .name = "ttm_resource",
>>>> +    .init = ttm_resource_test_init,
>>>> +    .exit = ttm_resource_test_fini,
>>>> +    .test_cases = ttm_resource_test_cases,
>>>> +};
>>>> +
>>>> +kunit_test_suites(&ttm_resource_test_suite);
>>>> +
>>>> +MODULE_LICENSE("GPL");
>>>> diff --git a/drivers/gpu/drm/ttm/ttm_resource.c 
>>>> b/drivers/gpu/drm/ttm/ttm_resource.c
>>>> index 46ff9c75bb12..02b96d23fdb9 100644
>>>> --- a/drivers/gpu/drm/ttm/ttm_resource.c
>>>> +++ b/drivers/gpu/drm/ttm/ttm_resource.c
>>>> @@ -30,6 +30,8 @@
>>>>   #include <drm/ttm/ttm_placement.h>
>>>>   #include <drm/ttm/ttm_resource.h>
>>>> +#include <drm/drm_util.h>
>>>> +
>>>>   /**
>>>>    * ttm_lru_bulk_move_init - initialize a bulk move structure
>>>>    * @bulk: the structure to init
>>>> @@ -240,6 +242,7 @@ int ttm_resource_alloc(struct ttm_buffer_object 
>>>> *bo,
>>>>       spin_unlock(&bo->bdev->lru_lock);
>>>>       return 0;
>>>>   }
>>>> +EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc);
>>>>   void ttm_resource_free(struct ttm_buffer_object *bo, struct 
>>>> ttm_resource **res)
>>>>   {
>>>
>