include/drm/drm_kunit_helpers.h

// SPDX-License-Identifier: GPL-2.0

#ifndef DRM_KUNIT_HELPERS_H_
#define DRM_KUNIT_HELPERS_H_

#include <kunit/test.h>

struct drm_device;
struct kunit;

struct device *drm_kunit_helper_alloc_device(struct kunit *test);
void drm_kunit_helper_free_device(struct kunit *test, struct device *dev);

struct drm_device *
__drm_kunit_helper_alloc_drm_device_with_driver(struct kunit *test,
						struct device *dev,
						size_t size, size_t offset,
						const struct drm_driver *driver);

/**
 * drm_kunit_helper_alloc_drm_device_with_driver - Allocates a mock DRM device for KUnit tests
 * @_test: The test context object
 * @_dev: The parent device object
 * @_type: the type of the struct which contains struct &drm_device
 * @_member: the name of the &drm_device within @_type.
 * @_drv: Mocked DRM device driver features
 *
 * This function creates a struct &drm_device from @_dev and @_drv.
 *
 * @_dev should be allocated using drm_kunit_helper_alloc_device().
 *
 * The driver is tied to the @_test context and will get cleaned at the
 * end of the test. The drm_device is allocated through
 * devm_drm_dev_alloc() and will thus be freed through a device-managed
 * resource.
 *
 * Returns:
 * A pointer to the new drm_device, or an ERR_PTR() otherwise.
 */
#define drm_kunit_helper_alloc_drm_device_with_driver(_test, _dev, _type, _member, _drv)	\
	((_type *)__drm_kunit_helper_alloc_drm_device_with_driver(_test, _dev,			\
						       sizeof(_type),				\
						       offsetof(_type, _member),		\
						       _drv))

static inline struct drm_device *
__drm_kunit_helper_alloc_drm_device(struct kunit *test,
				    struct device *dev,
				    size_t size, size_t offset,
				    u32 features)
{
	struct drm_driver *driver;

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

	driver->driver_features = features;

	return __drm_kunit_helper_alloc_drm_device_with_driver(test, dev,
							       size, offset,
							       driver);
}

/**
 * drm_kunit_helper_alloc_drm_device - Allocates a mock DRM device for KUnit tests
 * @_test: The test context object
 * @_dev: The parent device object
 * @_type: the type of the struct which contains struct &drm_device
 * @_member: the name of the &drm_device within @_type.
 * @_features: Mocked DRM device driver features
 *
 * This function creates a struct &drm_driver and will create a struct
 * &drm_device from @_dev and that driver.
 *
 * @_dev should be allocated using drm_kunit_helper_alloc_device().
 *
 * The driver is tied to the @_test context and will get cleaned at the
 * end of the test. The drm_device is allocated through
 * devm_drm_dev_alloc() and will thus be freed through a device-managed
 * resource.
 *
 * Returns:
 * A pointer to the new drm_device, or an ERR_PTR() otherwise.
 */
#define drm_kunit_helper_alloc_drm_device(_test, _dev, _type, _member, _feat)	\
	((_type *)__drm_kunit_helper_alloc_drm_device(_test, _dev,		\
						      sizeof(_type),		\
						      offsetof(_type, _member),	\
						      _feat))

#endif // DRM_KUNIT_HELPERS_H_