linux-kernel - Re: [PATCH v4 0/6] dma-buf: Check status of enable-signaling bit on debug

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Date:   Thu, 15 Sep 2022 18:32:16 +0530
From:   "Yadav, Arvind" <arvyadav@....com>
To:     Christian König <christian.koenig@....com>,
        Arvind Yadav <Arvind.Yadav@....com>, andrey.grodzovsky@....com,
        shashank.sharma@....com, amaranath.somalapuram@....com,
        Arunpravin.PaneerSelvam@....com, sumit.semwal@...aro.org,
        gustavo@...ovan.org, airlied@...ux.ie, daniel@...ll.ch,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/6] dma-buf: Check status of enable-signaling bit on
 debug


On 9/15/2022 5:37 PM, Christian König wrote:
> Is that sufficient to allow running a desktop on amdgpu with the extra 
> check enabled? If yes that would be quite a milestone.
>
Yes, It is running on amdgpu with extra config enabled.
> What's left is checking the userspace IGT tests. Especially the 
> sync_file and drm_syncobj tests I would expect to have problems with 
> this extra check.
>
Yes, IGT test cases are failing .

~Arvind

> Thanks,
> Christian.
>
> Am 14.09.22 um 18:43 schrieb Arvind Yadav:
>> Fence signaling must be enabled to make sure that
>> the dma_fence_is_signaled() function ever returns true.
>> Since drivers and implementations sometimes mess this up,
>> this ensures correct behaviour when DEBUG_WW_MUTEX_SLOWPATH
>> is used during debugging.
>> This should make any implementation bugs resulting in not
>> signaled fences much more obvious.
>>
>> Arvind Yadav (6):
>>    [PATCH v4 1/6] dma-buf: Remove the signaled bit status check
>>    [PATCH v4 2/6] dma-buf: set signaling bit for the stub fence
>>    [PATCH v4 3/6] dma-buf: Enable signaling on fence for selftests
>>    [PATCH v4 4/6] dma-buf: dma_fence_wait must enable signaling
>>    [PATCH v4 5/6] drm/sched: Use parent fence instead of finished
>>    [PATCH v4 6/6] dma-buf: Check status of enable-signaling bit on debug
>>
>>   drivers/dma-buf/Kconfig                |  7 +++++++
>>   drivers/dma-buf/dma-fence.c            | 16 ++++++++++------
>>   drivers/dma-buf/st-dma-fence-chain.c   |  4 ++++
>>   drivers/dma-buf/st-dma-fence-unwrap.c  | 22 ++++++++++++++++++++++
>>   drivers/dma-buf/st-dma-fence.c         | 16 ++++++++++++++++
>>   drivers/dma-buf/st-dma-resv.c          | 10 ++++++++++
>>   drivers/gpu/drm/scheduler/sched_main.c |  4 ++--
>>   include/linux/dma-fence.h              |  5 +++++
>>   8 files changed, 76 insertions(+), 8 deletions(-)
>>
>