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// SPDX-License-Identifier: GPL-2.0
#include <drm/drm_drv.h>
#include <drm/drm_kunit_helpers.h>
#include <drm/drm_managed.h>
#include <kunit/resource.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#define KUNIT_DEVICE_NAME "drm-kunit-mock-device"
struct kunit_dev {
struct drm_device base;
};
static const struct drm_mode_config_funcs drm_mode_config_funcs = {
};
static int fake_probe(struct platform_device *pdev)
{
return 0;
}
static int fake_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver fake_platform_driver = {
.probe = fake_probe,
.remove = fake_remove,
.driver = {
.name = KUNIT_DEVICE_NAME,
},
};
/**
* drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
* @test: The test context object
*
* This allocates a fake struct &device to create a mock for a KUnit
* test. The device will also be bound to a fake driver. It will thus be
* able to leverage the usual infrastructure and most notably the
* device-managed resources just like a "real" device.
*
* Callers need to make sure drm_kunit_helper_free_device() on the
* device when done.
*
* Returns:
* A pointer to the new device, or an ERR_PTR() otherwise.
*/
struct device *drm_kunit_helper_alloc_device(struct kunit *test)
{
struct platform_device *pdev;
int ret;
ret = platform_driver_register(&fake_platform_driver);
KUNIT_ASSERT_EQ(test, ret, 0);
pdev = platform_device_alloc(KUNIT_DEVICE_NAME, PLATFORM_DEVID_NONE);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
ret = platform_device_add(pdev);
KUNIT_ASSERT_EQ(test, ret, 0);
return &pdev->dev;
}
EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
/**
* drm_kunit_helper_free_device - Frees a mock device
* @test: The test context object
* @dev: The device to free
*
* Frees a device allocated with drm_kunit_helper_alloc_device().
*/
void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
platform_device_unregister(pdev);
platform_driver_unregister(&fake_platform_driver);
}
EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);
/**
* drm_kunit_helper_alloc_drm_device - Allocates a mock DRM device for KUnit tests
* @test: The test context object
* @dev: The parent device object
* @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.
*/
struct drm_device *
drm_kunit_helper_alloc_drm_device(struct kunit *test, struct device *dev,
u32 features)
{
struct kunit_dev *kdev;
struct drm_device *drm;
struct drm_driver *driver;
int ret;
driver = kunit_kzalloc(test, sizeof(*driver), GFP_KERNEL);
if (!driver)
return ERR_PTR(-ENOMEM);
driver->driver_features = features;
kdev = devm_drm_dev_alloc(dev, driver, struct kunit_dev, base);
if (IS_ERR(kdev))
return ERR_CAST(kdev);
drm = &kdev->base;
drm->mode_config.funcs = &drm_mode_config_funcs;
ret = drmm_mode_config_init(drm);
if (ret)
return ERR_PTR(ret);
return drm;
}
EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_drm_device);
MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
MODULE_LICENSE("GPL");
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