Re: [PATCH] igt/kms_addfb_basic: New subtest to check for fb modifier and tiling mode mismatch

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

Hi,

On 16/10/15 02:10, Vivek Kasireddy wrote:
>>>>> On 07/10/15 03:35, Vivek Kasireddy wrote:
>>>>>> This new subtest will validate a Y-tiled object's tiling mode
>>>>>> against its associated fb modifier.
>>>>>>
>>>>>> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>>>>> Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
>>>>>> ---
>>>>>>     tests/kms_addfb_basic.c | 9 +++++++++
>>>>>>     1 file changed, 9 insertions(+)
>>>>>>
>>>>>> diff --git a/tests/kms_addfb_basic.c b/tests/kms_addfb_basic.c
>>>>>> index d466e4d..7ca1add 100644
>>>>>> --- a/tests/kms_addfb_basic.c
>>>>>> +++ b/tests/kms_addfb_basic.c
>>>>>> @@ -373,6 +373,15 @@ static void addfb25_ytile(int fd, int gen)
>>>>>>             f.handles[0] = gem_bo;
>>>>>>         }
>>>>>>
>>>>>> +    igt_subtest("addfb25-Y-tiled-X-modifier-mismatch") {
>>>>>> +        igt_require(gen >= 9);
>>>>>> +        igt_require_fb_modifiers(fd);
>>>>>> +        gem_set_tiling(fd, gem_bo, I915_TILING_Y, 1024*4);
>>>>>> +
>>>>>> +        f.modifier[0] = LOCAL_I915_FORMAT_MOD_X_TILED;
>>>>>> +        igt_assert(drmIoctl(fd,
>>>>>> LOCAL_DRM_IOCTL_MODE_ADDFB2, &f) < 0 && errno == EINVAL);
>>>>>> +    }
>>>>>> +
>>>>>>         igt_subtest("addfb25-Y-tiled") {
>>>>>>             igt_require_fb_modifiers(fd);
>>>>>>
>>>>>
>>>>> Wasn't the original WARN triggered by Y tiled object and Y fb
>>>>> modifier?
>>>>
>>>> Creating a new fb using a Y-tiled object and Y/X fb modifier will
>>>> not trigger the original WARN. It'll be triggered only if the fb
>>>> is going to be pinned -- and flipped. I am not sure how to get
>>>> that WARN to be triggered with the existing suite of igt tests.
>>>
>>> Ah yes, you would need to attempt display it, not even necessarily
>>> flip it. I am sure there are tests which do that. :) I know from
>>> recent activity kms_rotation_crc for example creates a Y tiled FB
>>> and displays it. So maybe borrow some code to start with from there.
>>
>> Even better, kms_flip_tiling does the majority of what is needed here
>> already. Just drop in a subtest which will do set_tiling and that
>> should be good.
>
> I have realized that I cannot get the the map_and_fenceable WARN to be
> triggered with any of the IGT tests. This is because the WARN is
> triggered only when pinning/fencing a Y-tiled fb that has a rotated
> view (90/270 degree rotation) that none of the IGT tests can do. I
> looked at and wrote a subtest in kms_rotation_crc but the WARN was not
> triggered because IGT does not support atomic flip/commit yet.
> Currently, since it does a SetPlane first, the object has a normal view
> and its map_and-fenceable bit is set, however, when the rotation
> property is applied, the object though has a rotated view, its
> map_and-fenceable bit never gets updated and stays 1 and hence the
> warning doesn't get triggered. I am copying the subtest code below for
> reference.

It is possible and it looks like you have been on the right track. If 
you just avoided rendering to the fb (paint_squares) I think it might 
have worked.

Unfortunately before reading your e-mail thoroughly I rushed and 
developed my own POC so you will now see a patch series I copied you on.

That triggers the WARN nicely.

But your approach, localized changes to kms_rotation_crc, is probably 
better. So feel free to refine your test case and we can drop my patch 
series.

Regards,

Tvrtko
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