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drm/ttm: Introduce KUnit test
Add the initial version of unit tests for ttm_device struct, together with helper functions. Signed-off-by: Karolina Stolarek <[email protected]> Reviewed-by: Christian König <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/3d1cc45c8a0cf536b92a850e0025f6c555de0169.1691487006.git.karolina.stolarek@intel.com Signed-off-by: Christian König <[email protected]>
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‎drivers/gpu/drm/Kconfig

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@@ -195,6 +195,21 @@ config DRM_TTM
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GPU memory types. Will be enabled automatically if a device driver
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uses it.
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config DRM_TTM_KUNIT_TEST
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tristate "KUnit tests for TTM" if !KUNIT_ALL_TESTS
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default n
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depends on DRM && KUNIT
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select DRM_TTM
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select DRM_EXPORT_FOR_TESTS if m
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select DRM_KUNIT_TEST_HELPERS
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default KUNIT_ALL_TESTS
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help
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Enables unit tests for TTM, a GPU memory manager subsystem used
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to manage memory buffers. This option is mostly useful for kernel
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developers.
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If in doubt, say "N".
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config DRM_EXEC
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tristate
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depends on DRM

‎drivers/gpu/drm/ttm/Makefile

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@@ -8,3 +8,4 @@ ttm-y := ttm_tt.o ttm_bo.o ttm_bo_util.o ttm_bo_vm.o ttm_module.o \
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ttm-$(CONFIG_AGP) += ttm_agp_backend.o
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obj-$(CONFIG_DRM_TTM) += ttm.o
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obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += tests/

‎drivers/gpu/drm/ttm/tests/.kunitconfig

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CONFIG_KUNIT=y
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CONFIG_DRM=y
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CONFIG_DRM_KUNIT_TEST_HELPERS=y
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CONFIG_DRM_TTM_KUNIT_TEST=y

‎drivers/gpu/drm/ttm/tests/Makefile

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# SPDX-License-Identifier: GPL-2.0 AND MIT
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obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
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ttm_device_test.o \
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ttm_kunit_helpers.o

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

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// SPDX-License-Identifier: GPL-2.0 AND MIT
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#include <drm/ttm/ttm_resource.h>
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#include <drm/ttm/ttm_device.h>
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#include <drm/ttm/ttm_placement.h>
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#include "ttm_kunit_helpers.h"
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static void ttm_device_init_basic(struct kunit *test)
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{
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struct ttm_test_devices *priv = test->priv;
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struct ttm_device *ttm_dev;
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struct ttm_resource_manager *ttm_sys_man;
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int err;
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ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
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KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
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err = ttm_device_kunit_init(priv, ttm_dev, false, false);
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KUNIT_ASSERT_EQ(test, err, 0);
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KUNIT_EXPECT_PTR_EQ(test, ttm_dev->funcs, &ttm_dev_funcs);
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KUNIT_ASSERT_NOT_NULL(test, ttm_dev->wq);
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KUNIT_ASSERT_NOT_NULL(test, ttm_dev->man_drv[TTM_PL_SYSTEM]);
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ttm_sys_man = &ttm_dev->sysman;
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KUNIT_ASSERT_NOT_NULL(test, ttm_sys_man);
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KUNIT_EXPECT_TRUE(test, ttm_sys_man->use_tt);
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KUNIT_EXPECT_TRUE(test, ttm_sys_man->use_type);
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KUNIT_ASSERT_NOT_NULL(test, ttm_sys_man->func);
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KUNIT_EXPECT_PTR_EQ(test, ttm_dev->dev_mapping,
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priv->drm->anon_inode->i_mapping);
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ttm_device_fini(ttm_dev);
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}
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static struct kunit_case ttm_device_test_cases[] = {
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KUNIT_CASE(ttm_device_init_basic),
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{}
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};
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static struct kunit_suite ttm_device_test_suite = {
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.name = "ttm_device",
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.init = ttm_test_devices_init,
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.exit = ttm_test_devices_fini,
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.test_cases = ttm_device_test_cases,
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};
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kunit_test_suites(&ttm_device_test_suite);
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MODULE_LICENSE("GPL");

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

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// SPDX-License-Identifier: GPL-2.0 AND MIT
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#include "ttm_kunit_helpers.h"
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struct ttm_device_funcs ttm_dev_funcs = {
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};
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EXPORT_SYMBOL_GPL(ttm_dev_funcs);
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int ttm_device_kunit_init(struct ttm_test_devices *priv,
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struct ttm_device *ttm,
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bool use_dma_alloc,
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bool use_dma32)
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{
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struct drm_device *drm = priv->drm;
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int err;
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err = ttm_device_init(ttm, &ttm_dev_funcs, drm->dev,
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drm->anon_inode->i_mapping,
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drm->vma_offset_manager,
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use_dma_alloc, use_dma32);
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return err;
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}
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EXPORT_SYMBOL_GPL(ttm_device_kunit_init);
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struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
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{
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struct ttm_test_devices *devs;
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devs = kunit_kzalloc(test, sizeof(*devs), GFP_KERNEL);
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KUNIT_ASSERT_NOT_NULL(test, devs);
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devs->dev = drm_kunit_helper_alloc_device(test);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, devs->dev);
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devs->drm = __drm_kunit_helper_alloc_drm_device(test, devs->dev,
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sizeof(*devs->drm), 0,
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DRIVER_GEM);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, devs->drm);
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return devs;
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}
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EXPORT_SYMBOL_GPL(ttm_test_devices_basic);
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struct ttm_test_devices *ttm_test_devices_all(struct kunit *test)
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{
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struct ttm_test_devices *devs;
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struct ttm_device *ttm_dev;
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int err;
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devs = ttm_test_devices_basic(test);
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ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
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KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
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err = ttm_device_kunit_init(devs, ttm_dev, false, false);
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KUNIT_ASSERT_EQ(test, err, 0);
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devs->ttm_dev = ttm_dev;
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return devs;
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}
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EXPORT_SYMBOL_GPL(ttm_test_devices_all);
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void ttm_test_devices_put(struct kunit *test, struct ttm_test_devices *devs)
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{
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if (devs->ttm_dev)
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ttm_device_fini(devs->ttm_dev);
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drm_kunit_helper_free_device(test, devs->dev);
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}
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EXPORT_SYMBOL_GPL(ttm_test_devices_put);
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int ttm_test_devices_init(struct kunit *test)
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{
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struct ttm_test_devices *priv;
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priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
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KUNIT_ASSERT_NOT_NULL(test, priv);
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priv = ttm_test_devices_basic(test);
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test->priv = priv;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ttm_test_devices_init);
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void ttm_test_devices_fini(struct kunit *test)
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{
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ttm_test_devices_put(test, test->priv);
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}
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EXPORT_SYMBOL_GPL(ttm_test_devices_fini);
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MODULE_LICENSE("GPL");

‎drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h

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/* SPDX-License-Identifier: GPL-2.0 AND MIT */
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#ifndef TTM_KUNIT_HELPERS_H
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#define TTM_KUNIT_HELPERS_H
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#include <drm/drm_drv.h>
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#include <drm/ttm/ttm_device.h>
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#include <drm/drm_kunit_helpers.h>
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#include <kunit/test.h>
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extern struct ttm_device_funcs ttm_dev_funcs;
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struct ttm_test_devices {
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struct drm_device *drm;
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struct device *dev;
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struct ttm_device *ttm_dev;
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};
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/* Building blocks for test-specific init functions */
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int ttm_device_kunit_init(struct ttm_test_devices *priv,
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struct ttm_device *ttm,
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bool use_dma_alloc,
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bool use_dma32);
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struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test);
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struct ttm_test_devices *ttm_test_devices_all(struct kunit *test);
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void ttm_test_devices_put(struct kunit *test, struct ttm_test_devices *devs);
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/* Generic init/fini for tests that only need DRM/TTM devices */
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int ttm_test_devices_init(struct kunit *test);
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void ttm_test_devices_fini(struct kunit *test);
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#endif // TTM_KUNIT_HELPERS_H

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