drm_kunit_h..._with_driver(9)

💅 drm_kunit_h..._with_driver(9) — from the Kernel API Manual, bestie

Okay so picture this: you're deep in KUnit testing, you need a mock DRM device, and you do not want to hand-roll one. That's literally this function's whole job. Welcome to drm_kunit_helper_alloc_drm_device_with_driver 🎀

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✨ NAME ✨

drm_kunit_helper_alloc_drm_device_with_driver — it allocates a mock DRM device for KUnit tests, no cap 🫶

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🦋 SYNOPSIS 🦋

drm_kunit_helper_alloc_drm_device_with_driver (_test , _dev , _type ,
       _member , _drv );

Like yes, that's a lot of underscores, she's a macro, she's allowed 💅

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🌸 ARGUMENTS 🌸

• _test — the test context object. Your main character test struct, the whole vibe check of the run ✨
• _dev — the parent device object 🧚
• _type — the type of the struct which contains struct drm_device. So like, the outer container she lives in 👑
• _member — the name of the drm_device within _type. Telling us exactly where to find her 🔍
• _drv — the mocked DRM device driver features. All the pretend-driver detail 🌈

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💖 DESCRIPTION 💖

This function creates a struct drm_device from _dev and _drv. Simple as that, periodt.

Heads up though, important detail: _dev should be allocated using drm_kunit_helper_alloc_device. Don't just vibe in with any random device, use the helper, iykyk 🙈

The driver gets tied to the _test context and will be cleaned up at the end of the test — it's giving responsible, self-cleaning icon behavior ✨ And the drm_device itself is allocated through devm_drm_dev_alloc, so it gets freed through a device-managed resource. No manual cleanup arc needed, the devres machinery handles it for you 🎀

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⭐ RETURN ⭐

A pointer to the new drm_device 💖 — or an ERR_PTR otherwise 😭 (always check, bestie, always check).

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🔥 SEE ALSO 🔥

• Kernel file ./include/drm/drm_kunit_helpers.h
• drm_kunit_helper_alloc_drm_device(9)

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That's the whole page, bestie, go write some tests 💜

Source path: ./include/drm · dated October 2026 · filed under drm_kunit_h..._with_driver(9) — mwah, catch you in the group chat 🦋💅