linux-kernel - Re: [PATCH 1/4] kunit: Add APIs for managing devices

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Message-ID: <f370cc19-719c-49dc-81a1-45a8ec4a6f3e@linux.intel.com>
Date:   Tue, 5 Dec 2023 10:02:07 +0100
From:   Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
To:     davidgow@...gle.com, Rae Moar <rmoar@...gle.com>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxime Ripard <mripard@...nel.org>
Cc:     linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-sound@...r.kernel.org
Subject: Re: [PATCH 1/4] kunit: Add APIs for managing devices

On 12/5/2023 8:31 AM, davidgow@...gle.com wrote:
> Tests for drivers often require a struct device to pass to other
> functions. While it's possible to create these with
> root_device_register(), or to use something like a platform device, this
> is both a misuse of those APIs, and can be difficult to clean up after,
> for example, a failed assertion.
> 
> Add some KUnit-specific functions for registering and unregistering a
> struct device:
> - kunit_device_register()
> - kunit_device_register_with_driver()
> - kunit_device_unregister()
> 
> These helpers allocate a on a 'kunit' bus which will either probe the
> driver passed in (kunit_device_register_with_driver), or will create a
> stub driver (kunit_device_register) which is cleaned up on test shutdown.
> 
> Devices are automatically unregistered on test shutdown, but can be
> manually unregistered earlier with kunit_device_unregister() in order
> to, for example, test device release code.
> 
> Signed-off-by: David Gow <davidgow@...gle.com>
> ---
>   Documentation/dev-tools/kunit/usage.rst |  49 +++++++++
>   include/kunit/device.h                  |  76 ++++++++++++++
>   lib/kunit/Makefile                      |   3 +-
>   lib/kunit/device.c                      | 176 ++++++++++++++++++++++++++++++++
>   lib/kunit/kunit-test.c                  |  68 +++++++++++-
>   lib/kunit/test.c                        |   3 +
>   6 files changed, 373 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst
> index 9db12e91668e..a222a98edceb 100644
> --- a/Documentation/dev-tools/kunit/usage.rst
> +++ b/Documentation/dev-tools/kunit/usage.rst
> @@ -797,3 +797,52 @@ structures as shown below:
>   KUnit is not enabled, or if no test is running in the current task, it will do
>   nothing. This compiles down to either a no-op or a static key check, so will
>   have a negligible performance impact when no test is running.
> +
> +Managing Fake Devcices and Drivers
> +----------------------------------

Typo: Devices