[igt-dev] [PATCH i-g-t] tests/xe: Add a test to toggle GT C states

[Riana Tauro]

Hi Vinay

Thanks for the review

On 8/7/2023 11:16 PM, Belgaumkar, Vinay wrote:
> 
> On 8/2/2023 10:48 PM, Riana Tauro wrote:
>> Add a test that toggles GT C states by checking if GT is in C0 when
>> forcewake is acquired and in C6 once released.
>>
>> v2: change test name (Suja, Anshuman)
>>
>> Signed-off-by: Riana Tauro <riana.tauro at intel.com>
>> ---
>>   tests/xe/xe_pm_residency.c | 26 ++++++++++++++++++++++++++
>>   1 file changed, 26 insertions(+)
>>
>> diff --git a/tests/xe/xe_pm_residency.c b/tests/xe/xe_pm_residency.c
>> index 4936de166..1c12113bc 100644
>> --- a/tests/xe/xe_pm_residency.c
>> +++ b/tests/xe/xe_pm_residency.c
>> @@ -38,6 +38,10 @@ const double tolerance = 0.1;
>>    * Description: basic residency test to validate idle residency
>>    *        measured over a time interval is within the tolerance
>>    * Run type: FULL
>> + *
>> + * SUBTEST: toggle-gt-c6
>> + * Description: Toggle GT C states by acquiring/releasing forcewake
>> + * Run type: FULL
>>    */
>>   IGT_TEST_DESCRIPTION("Tests for gtidle properties");
>> @@ -85,6 +89,24 @@ static void test_idle_residency(int fd, int gt)
>>       assert_within_epsilon(residency_end - residency_start, 
>> elapsed_ms, tolerance);
>>   }
>> +static void toggle_gt_c6(int fd, int n)
>> +{
>> +    int handle, gt;
>> +
>> +    while (n--) {
>> +        handle = igt_debugfs_open(fd, "forcewake_all", O_WRONLY);
>> +        igt_assert(handle >= 0);
>> +        /* check if all gts are in C0 after forcewake is acquired */
>> +        xe_for_each_gt(fd, gt)
>> +            igt_assert_f(!xe_is_gt_in_c6(fd, gt), "GT in C6\n");
> If it asserts here, will the test reset the force wake before exiting? 
> If not, we need some kind of exit handler that does that.
Will add a if statement and close the handle when the condition is false

>> +        close(handle);
> 
> Do you need some delay here to ensure GT goes into C6?

While checking if gt is in C6, igt_wait is used which uses 1000ms as 
timeout and 1ms as interval to sleep. So delay is added.

Should i increase the timeout ?

Thanks
Riana
> 
> Thanks,
> 
> Vinay.
> 
>> +        /* check if all gts are in C6 after forcewake is released */
>> +        xe_for_each_gt(fd, gt)
>> +            igt_assert_f(igt_wait(xe_is_gt_in_c6(fd, gt), 1000, 1),
>> +                     "GT is not in C6\n");
>> +    }
>> +}
>> +
>>   igt_main
>>   {
>>       int fd, gt;
>> @@ -104,6 +126,10 @@ igt_main
>>           xe_for_each_gt(fd, gt)
>>               test_idle_residency(fd, gt);
>> +    igt_describe("Toggle GT C states by acquiring/releasing forcewake");
>> +    igt_subtest("toggle-gt-c6")
>> +        toggle_gt_c6(fd, 16);
> Why aren't we running this per GT? Also, please add a #define like 
> NUM_REPS or something instead of using 16 here.
>> +
>>       igt_fixture {
>>           close(fd);
>>       }