linux-kernel - Re: [PATCH v2] drm/syncobj: Fix sync syncobj issue

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Message-ID: <ea892ffc-4a03-7772-6d99-85a356a3738b@intel.com>
Date:   Tue, 12 Jul 2022 17:22:03 +0300
From:   Lionel Landwerlin <lionel.g.landwerlin@...el.com>
To:     Christian König <christian.koenig@....com>,
        jie1zhan <jesse.zhang@....com>, broonie@...nel.org,
        dri-devel-bounces@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     Vijendar.Mukunda@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, ajitkumar.pandey@....com,
        lucas.demarchi@...el.com, nirmoy.das@...ux.intel.com,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/syncobj: Fix sync syncobj issue

I'll let Lucas comment. I've only looked a little at it.
 From what I remember just enabling sw_signaling was enough to fix the 
issue.

-Lionel

On 12/07/2022 13:26, Christian König wrote:
> Ping to the Intel guys here. Especially Lucas/Nirmoy/Lionel.
>
> IIRC you stumbled over that problem as well, have you found any solution?
>
> Regards,
> Christian.
>
> Am 07.07.22 um 12:29 schrieb jie1zhan:
>> enable signaling after flatten dma_fence_chains on transfer
>>
>> Signed-off-by: jie1zhan <jesse.zhang@....com>
>> ---
>>   drivers/gpu/drm/drm_syncobj.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/drm_syncobj.c 
>> b/drivers/gpu/drm/drm_syncobj.c
>> index 7e48dcd1bee4..0d9d3577325f 100644
>> --- a/drivers/gpu/drm/drm_syncobj.c
>> +++ b/drivers/gpu/drm/drm_syncobj.c
>> @@ -920,6 +920,7 @@ static int 
>> drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
>>       if (ret)
>>           goto err_free_fence;
>>   +    dma_fence_enable_sw_signaling(fence);
>>       chain = dma_fence_chain_alloc();
>>       if (!chain) {
>>           ret = -ENOMEM;
>