linux-kernel - Re: [PATCH] drm: omapdrm: Fix implicit dma

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Date:   Thu, 6 Jan 2022 18:26:22 +0200
From:   Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        sumit.semwal@...aro.org, christian.koenig@....com
Cc:     openpvrsgx-devgroup@...ux.org, merlijn@...zup.org,
        philipp@...s.xyz, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] drm: omapdrm: Fix implicit dma_buf fencing

Hi,

On 6.01.22 г. 15:43 ч., Tomi Valkeinen wrote:
> Hi,
> 
> On 05/01/2022 17:36, Ivaylo Dimitrov wrote:
>> Currently omapdrm driver does not initialize dma_buf_export_info resv
>> member, which leads to a new dma_resv being allocated and attached to
>> the exported dma_buf. This leads to the issue that fences created on
>> dma_buf objects imported by other drivers are ignored by omapdrm, as only
>> fences in gem object resv are waited on. This leads to various issues 
>> like
>> displaying incomplete frames.
>>
>> Fix that by initializing dma_buf resv to the resv of the gem object being
>> exported.
>>
>> Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
>> ---
>>   drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c 
>> b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
>> index f1f93cabb61e..a111e5c91925 100644
>> --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
>> @@ -88,6 +88,7 @@ struct dma_buf *omap_gem_prime_export(struct 
>> drm_gem_object *obj, int flags)
>>       exp_info.size = omap_gem_mmap_size(obj);
>>       exp_info.flags = flags;
>>       exp_info.priv = obj;
>> +    exp_info.resv = obj->resv;
>>       return drm_gem_dmabuf_export(obj->dev, &exp_info);
>>   }
> 
> Thanks! Pushed to drm-misc-next.
> 

Thanks,

I think lts kernels shall get that fix too, but I have no idea how :) .

Ivo.