[PATCH] kunit: Mark filter_glob param as rw

[Lucas De Marchi]

By allowing the filter_glob parameter to be written to, it's possible to
tweak the testsuites that will be executed on new module loads. This
makes it easier to run specific tests without having to reload kunit and
provides a way to filter tests on real HW even if kunit is builtin.
Example for xe driver:

1) Run just 1 test
# echo -n xe_bo > /sys/module/kunit/parameters/filter_glob
# modprobe -r xe_live_test
# modprobe xe_live_test
# ls /sys/kernel/debug/kunit/
xe_bo

2) Run all tests
# echo \* > /sys/module/kunit/parameters/filter_glob
# modprobe -r xe_live_test
# modprobe xe_live_test
# ls /sys/kernel/debug/kunit/
xe_bo xe_dma_buf xe_migrate xe_mocs

References: https://lore.kernel.org/intel-xe/dzacvbdditbneiu3e3fmstjmttcbne44yspumpkd6sjn56jqpk@vxu7sksbqrp6/
Signed-off-by: Lucas De Marchi <lucas.d...@intel.com>
---
lib/kunit/executor.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 1236b3cd2fbb..30ed9d321c19 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -31,7 +31,7 @@ static char *filter_glob_param;
static char *filter_param;
static char *filter_action_param;

-module_param_named(filter_glob, filter_glob_param, charp, 0400);
+module_param_named(filter_glob, filter_glob_param, charp, 0600);
MODULE_PARM_DESC(filter_glob,
"Filter which KUnit test suites/tests run at boot-time, e.g. list* or list*.*del_test");
module_param_named(filter, filter_param, charp, 0400);
--
2.40.1

[Rae Moar]

On Thu, Jan 11, 2024 at 7:13 PM Lucas De Marchi
<lucas.d...@intel.com> wrote:
>
> By allowing the filter_glob parameter to be written to, it's possible to
> tweak the testsuites that will be executed on new module loads. This
> makes it easier to run specific tests without having to reload kunit and
> provides a way to filter tests on real HW even if kunit is builtin.
> Example for xe driver:
>
> 1) Run just 1 test
> # echo -n xe_bo > /sys/module/kunit/parameters/filter_glob
> # modprobe -r xe_live_test
> # modprobe xe_live_test
> # ls /sys/kernel/debug/kunit/
> xe_bo
>
> 2) Run all tests
> # echo \* > /sys/module/kunit/parameters/filter_glob
> # modprobe -r xe_live_test
> # modprobe xe_live_test
> # ls /sys/kernel/debug/kunit/
> xe_bo xe_dma_buf xe_migrate xe_mocs
>
> References: https://lore.kernel.org/intel-xe/dzacvbdditbneiu3e3fmstjmttcbne44yspumpkd6sjn56jqpk@vxu7sksbqrp6/
> Signed-off-by: Lucas De Marchi <lucas.d...@intel.com>

Hello!

I have tested this and this looks good to me. I agree this is very
helpful and I wonder if we should do the same with the other module
parameters (filter, filter_action).

It did worry me to make filter_glob writable due to the recent patch
that requires the output of filtering to be a valid virtual address
but I think there is a sufficient amount of checking of filter_glob.

Thanks!
-Rae

Reviewed-by: Rae Moar <rm...@google.com>

> ---
> lib/kunit/executor.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> index 1236b3cd2fbb..30ed9d321c19 100644
> --- a/lib/kunit/executor.c
> +++ b/lib/kunit/executor.c
> @@ -31,7 +31,7 @@ static char *filter_glob_param;
> static char *filter_param;
> static char *filter_action_param;
>
> -module_param_named(filter_glob, filter_glob_param, charp, 0400);
> +module_param_named(filter_glob, filter_glob_param, charp, 0600);
> MODULE_PARM_DESC(filter_glob,
> "Filter which KUnit test suites/tests run at boot-time, e.g. list* or list*.*del_test");
> module_param_named(filter, filter_param, charp, 0400);
> --
> 2.40.1
>

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[Lucas De Marchi]

yeah, after I sent this I was wondering about the other parameters. I
don't have a use for them right now, but I can try a few things and spin
a new version if people find it useful.

>
>It did worry me to make filter_glob writable due to the recent patch
>that requires the output of filtering to be a valid virtual address
>but I think there is a sufficient amount of checking of filter_glob.
>
>Thanks!
>-Rae
>
>Reviewed-by: Rae Moar <rm...@google.com>

thanks
Lucas De Marchi

[Krzysztofik, Janusz]

Yes, please do. I find it very useful for improving the current
implementation of IGT kunit which now depends the ability to unload and reload
the kunit base module with specific filter parameters in order to get a KTAP
formatted list of test cases without executing them, then to run those test
cases filtered one by one.

Thanks,
Janusz

>
> >
> >It did worry me to make filter_glob writable due to the recent patch
> >that requires the output of filtering to be a valid virtual address
> >but I think there is a sufficient amount of checking of filter_glob.
> >
> >Thanks!
> >-Rae
> >
> >Reviewed-by: Rae Moar <rm...@google.com>
>
> thanks
> Lucas De Marchi
>
>

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