drivers/gpu/drm/tests/drm_kunit_helpers.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/tests/drm_kunit_helpers.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/tests/drm_kunit_helpers.c
Extension
.c
Size
11149 bytes
Lines
401
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_kunit_helpers.h>
#include <drm/drm_managed.h>

#include <kunit/device.h>
#include <kunit/resource.h>

#include <linux/device.h>
#include <linux/export.h>
#include <linux/platform_device.h>

#define KUNIT_DEVICE_NAME	"drm-kunit-mock-device"

static const struct drm_mode_config_funcs drm_mode_config_funcs = {
	.atomic_check	= drm_atomic_helper_check,
	.atomic_commit	= drm_atomic_helper_commit,
};

/**
 * 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.
 *
 * Resources will be cleaned up automatically, but the removal can be
 * forced using @drm_kunit_helper_free_device.
 *
 * Returns:
 * A pointer to the new device, or an ERR_PTR() otherwise.
 */
struct device *drm_kunit_helper_alloc_device(struct kunit *test)
{
	return kunit_device_register(test, KUNIT_DEVICE_NAME);
}
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)
{
	kunit_device_unregister(test, dev);
}
EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);

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)
{
	struct drm_device *drm;
	void *container;
	int ret;

	container = __devm_drm_dev_alloc(dev, driver, size, offset);
	if (IS_ERR(container))
		return ERR_CAST(container);

	drm = container + offset;
	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_with_driver);

static void kunit_action_drm_atomic_commit_put(void *ptr)
{
	struct drm_atomic_commit *state = ptr;

	drm_atomic_commit_put(state);
}

Annotation

Implementation Notes