drm/tests: helpers: Allow to pass a custom drm_driver

Some tests will need to provide their own drm_driver instead of relying
on the dumb one in the helpers, so let's create a helper that allows to
do so.

Reviewed-by: Javier Martinez Canillas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

drivers/gpu/drm/tests/drm_kunit_helpers.c

@@ -82,20 +82,15 @@ void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
 EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);
 
 struct drm_device *
-__drm_kunit_helper_alloc_drm_device(struct kunit *test, struct device *dev,
- size_t size, size_t offset,
- u32 features)
+__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)
 {
  struct drm_device *drm;
- struct drm_driver *driver;
  void *container;
  int ret;
 
- driver = kunit_kzalloc(test, sizeof(*driver), GFP_KERNEL);
- if (!driver)
- return ERR_PTR(-ENOMEM);
-
- driver->driver_features = features;
  container = __devm_drm_dev_alloc(dev, driver, size, offset);
  if (IS_ERR(container))
  return ERR_CAST(container);
@@ -109,7 +104,7 @@ __drm_kunit_helper_alloc_drm_device(struct kunit *test, struct device *dev,
 
  return drm;
 }
-EXPORT_SYMBOL_GPL(__drm_kunit_helper_alloc_drm_device);
+EXPORT_SYMBOL_GPL(__drm_kunit_helper_alloc_drm_device_with_driver);
 
 MODULE_AUTHOR("Maxime Ripard <[email protected]>");
 MODULE_LICENSE("GPL");

include/drm/drm_kunit_helpers.h

@@ -3,16 +3,63 @@
 #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(struct kunit *test, struct device *dev,
+__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);
+ 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