[PATCH v1] Fix: SYNCOBJ TIMELINE Test failed.

[Christian König]

Hi Jesse,

yes, I know that's a well known bug.

The Intel guys have already narrowed it down to a missing 
dma_fence_enable_signaling() in the syncobj code path.

I strongly suggest to work together with them to find where that needs 
to be added instead.

Regards,
Christian.

Am 30.06.22 um 17:26 schrieb Zhang, Jesse(Jie):
> [AMD Official Use Only - General]
>
>
> Hi  Christian,
> If we remove the following patch, the  "syncobj timeline test" can pass.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=721255b52700b320c4ae2e23d57f7d9ad1db50b9
>
>
> The following log is provided by AMD CQE team. They run the amdgpu_test tool on ubuntu22 (kernel version 5.15.0-39)
> Suite: SYNCOBJ TIMELINE Tests
>    Test: syncobj timeline test ...FAILED
>      1. sources/drm/tests/amdgpu/syncobj_tests.c:299  - CU_ASSERT_EQUAL(payload,18)
>      2. sources/drm/tests/amdgpu/syncobj_tests.c:309  - CU_ASSERT_EQUAL(payload,20)
> You can get more detail information by the attachment.
>
> So we need fix this issue. And if you have any better solution to solve the issue, please let me know.
>
> Thanks
> Jesse
>
> -----Original Message-----
> From: Koenig, Christian <Christian.Koenig at amd.com>
> Sent: Wednesday, 29 June 2022 5:12 pm
> To: Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>; broonie at kernel.org; alsa-devel at alsa-project.org
> Cc: Mukunda, Vijendar <Vijendar.Mukunda at amd.com>; Hiregoudar, Basavaraj <Basavaraj.Hiregoudar at amd.com>; Dommati, Sunil-kumar <Sunil-kumar.Dommati at amd.com>; Pandey, Ajit Kumar <AjitKumar.Pandey at amd.com>; Nirmoy Das <nirmoy.das at linux.intel.com>; Maarten Lankhorst <maarten.lankhorst at linux.intel.com>; Maxime Ripard <mripard at kernel.org>; Thomas Zimmermann <tzimmermann at suse.de>; David Airlie <airlied at linux.ie>; Daniel Vetter <daniel at ffwll.ch>; Sumit Semwal <sumit.semwal at linaro.org>; open list:DRM DRIVERS <dri-devel at lists.freedesktop.org>; open list <linux-kernel at vger.kernel.org>; open list:DMA BUFFER SHARING FRAMEWORK <linux-media at vger.kernel.org>; moderated list:DMA BUFFER SHARING FRAMEWORK <linaro-mm-sig at lists.linaro.org>
> Subject: Re: [PATCH v1] Fix: SYNCOBJ TIMELINE Test failed.
>
> Am 29.06.22 um 08:02 schrieb jie1zhan:
>>    The issue cause by the commit :
>>
>> 721255b527(drm/syncobj: flatten dma_fence_chains on transfer).
>>
>> Because it use the point of dma_fence incorrectly
>>
>> Correct the point of dma_fence by fence array
> Well that patch is just utterly nonsense as far as I can see.
>
>> Signed-off-by: jie1zhan <jesse.zhang at amd.com>
>>
>> Reviewed-by: Christian König <christian.koenig at amd.com>
>>
>> Reviewed-by: Nirmoy Das <nirmoy.das at linux.intel.com>
> I have strong doubts that Nirmoy has reviewed this and I certainly haven't reviewed it.
>
> Christian.
>
>> ---
>>    drivers/gpu/drm/drm_syncobj.c | 2 +-
>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/drm_syncobj.c
>> b/drivers/gpu/drm/drm_syncobj.c index 7e48dcd1bee4..d5db818f1c76
>> 100644
>> --- a/drivers/gpu/drm/drm_syncobj.c
>> +++ b/drivers/gpu/drm/drm_syncobj.c
>> @@ -887,7 +887,7 @@ static int drm_syncobj_flatten_chain(struct dma_fence **f)
>>    		goto free_fences;
>>    
>>    	dma_fence_put(*f);
>> -	*f = &array->base;
>> +	*f = array->fences[0];
>>    	return 0;
>>    
>>    free_fences: