linux-kernel - Re: [PATCH 0/2] Modify the watchdog selftest for execution with

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Date: Tue, 18 Jun 2024 15:40:38 +0200
From: Laura Nao <laura.nao@...labora.com>
To: skhan@...uxfoundation.org
Cc: kernel@...labora.com,
	laura.nao@...labora.com,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	shuah@...nel.org
Subject: Re: [PATCH 0/2] Modify the watchdog selftest for execution with

Hi Shuah,

On 6/7/24 23:07, Shuah Khan wrote:
> On 6/7/24 03:53, Laura Nao wrote:
>> Hi Shuah,
>>
>> On 6/7/24 01:03, Shuah Khan wrote:
>>> On 6/6/24 03:57, Laura Nao wrote:
>>>> Hi Shuah,
>>>>
>>>> On 5/6/24 13:13, Laura Nao wrote:
>>>>> The watchdog selftest script supports various parameters for testing
>>>>> different IOCTLs. The watchdog ping functionality is validated by
>>>>> starting
>>>>> a loop where the watchdog device is periodically pet, which can only
>>>>> be
>>>>> stopped by the user interrupting the script.
>>>>>
>>>>> This results in a timeout when running this test using the kselftest
>>>>> runner
>>>>> with no non-oneshot parameters (or no parameters at all):
>>>
>>>
>>> Sorry for the delay on this.
>>>
>>> This test isn't include in the default kselftest run? How are you
>>> running this?
>>>
>>
>> The goal of this series is to enable the test to be run using the
>> kselftest runner individually, not as part of the default run. So for
>> example w/out args:
>>
>> make -C tools/testing/selftests TARGETS=watchdog run_tests
>>
>> or with args:
>>
>> KSELFTEST_WATCHDOG_TEST_ARGS='-b -d -e -s -t 12 -T 3 -n 7 -N -L' make -C
>> tools/testing/selftests TARGETS=watchdog run_tests
>>>>>
>>>>>     TAP version 13
>>>>>     1..1
>>>>>     # timeout set to 45
>>>>>     # selftests: watchdog: watchdog-test
>>>>>     # Watchdog Ticking Away!
>>>>>     # .............................................#
>>>>>     not ok 1 selftests: watchdog: watchdog-test # TIMEOUT 45 seconds
>>>>>
>>>>> To address this issue, the first patch in this series limits the
>>>>> loop
>>>>> to 5
>>>>> iterations by default and adds support for a new '-c' option to
>>>>> customize
>>>>> the number of pings as required.
>>>>>
>>>>> The second patch conforms the test output to the KTAP format.
>>>>>
>>>>
>>>> Gentle ping - any thoughts on this series? It would simplify running
>>>> the
>>>> watchdog kselftest in CI environments by leveraging the runner.
>>>>
>>>
>>> This test isn't intended to be included in the default run. It
>>> requires
>>> loading a watchdog driver first. Do you load the driver from the
>>> runner?
>>>
>>
>> I get this test requires watchdog drivers to be loaded (which in this
>> case can't be added to a config fragment that goes with the selftest, as
>> they are platform-specific) and therefore cannot be included in the
>> default run. However, having ktap output support and limiting the ping
>> loop would allow the test to be run individually in the same way as
>> other selftests (so through the kselftest runner).
>>
>> Naturally, driver dependencies must be met for the test to run and
>> produce valid results. From my understanding the runner itself cannot
>> ensure this, so in this case it would be up to the user or CI to
>> enable/load the appropriate drivers before running the test.
>> If these dependencies are not satisfied, the test could just exit
>> with a skip code.
>>
>> Does this make sense to you? or is the kselftest runner intended to be
>> used to run exclusively a subset of tests in the selftests directory
>> (i.e. the ones that don't have platform-specific driver requirements)?
>>
> 
> There are several tests that aren't included in the default run because
> they have dependencies and potentially damaging to the running system.
> These tests are not included for a reason.
> 
> The first step would to be ensure writing shell script to load and
> unload the watchdog module and then pass in existing parameters such
> as the oneshot to run the test.
> 
> There is no need to add a new parameter yet. Also there is no need to
> convert this to ktap yet.
> 

To clarify, I understand that this test is not suitable for the default 
run, and I do not intend to change that. The patch series is meant to 
make the test usable in a non-interactive environment, such as a CI,
when explicitly enabled and with the required modules already loaded.

Thanks,

Laura