Date: Fri, 21 Jun 2024 15:08:14 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Laura Nao <laura.nao@...labora.com>
Cc: kernel@...labora.com, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, shuah@...nel.org,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH 0/2] Modify the watchdog selftest for execution with

On 6/18/24 07:40, Laura Nao wrote:
> 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.
> 

The test can be with one shot timer - how is this test currently not
usable and how are your changes making it usable?

thanks,
-- Shuah

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