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Subject: Re: [PATCH v2 1/2] drm/shmem: add support for per object caching
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To:     Gerd Hoffmann <kraxel@redhat.com>, dri-devel@lists.freedesktop.org,
        David Airlie <airlied@linux.ie>,
        open list <linux-kernel@vger.kernel.org>,
        gurchetansingh@chromium.org
References: <20191211081810.20079-1-kraxel@redhat.com>
 <20191211081810.20079-2-kraxel@redhat.com>
 <0b64e917-48f7-487e-9335-2838b6c62808@suse.de>
 <ed9142da-ce10-7df2-8a85-ba9ad0c26551@suse.de>
 <20191211123635.GY624164@phenom.ffwll.local>
From:   Thomas Zimmermann <tzimmermann@suse.de>
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Date:   Wed, 11 Dec 2019 14:09:59 +0100
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From: Thomas Zimmermann <tzimmermann@suse.de>
To: Gerd Hoffmann <kraxel@redhat.com>, dri-devel@lists.freedesktop.org,
 David Airlie <airlied@linux.ie>, open list <linux-kernel@vger.kernel.org>,
 gurchetansingh@chromium.org
Message-ID: <7554edf6-ff53-b00f-8abb-dfeb80bfacbe@suse.de>
Subject: Re: [PATCH v2 1/2] drm/shmem: add support for per object caching
 attributes
References: <20191211081810.20079-1-kraxel@redhat.com>
 <20191211081810.20079-2-kraxel@redhat.com>
 <0b64e917-48f7-487e-9335-2838b6c62808@suse.de>
 <ed9142da-ce10-7df2-8a85-ba9ad0c26551@suse.de>
 <20191211123635.GY624164@phenom.ffwll.local>
In-Reply-To: <20191211123635.GY624164@phenom.ffwll.local>

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Hi

Am 11.12.19 um 13:36 schrieb Daniel Vetter:
>=20
> The udl use-case should be covered already, simply set the flag correct=
ly
> at create/import time? It's per-object ...

The original udl gem code did this. It was additional state for
something that was detectable from the value of import_attach. So udl
now overrides vmap and mmap.


> btw on why udl does this: Imported bo are usually rendered by real hw, =
and
> reading it uncached/wc is the more defensive setting. It would be kinda=

> nice if dma-buf would expose this, but I fear dma-api maintainers would=

> murder us if we even just propose that ... so it's a mess right now.

Yeah, in some way it's a variation of the discussion around fbdev memory
access that we had before.

Best regards
Thomas

>=20
> btw the issue extends to dma access by devices too, e.g. both i915 and
> amdgpu can select the coherency mode at runtime (using e.g. the pcie
> no-snoop transaction mode), and we have similar uncoordinated hacks in
> there too, like in udl.
> -Daniel
>=20
>>
>> Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
>>
>> if you prefer to merge v1.
>>
>>>
>>> Best regards
>>> Thomas
>>>
>>>>
>>>
>>
>> --=20
>> Thomas Zimmermann
>> Graphics Driver Developer
>> SUSE Software Solutions Germany GmbH
>> Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany
>> (HRB 36809, AG N=C3=BCrnberg)
>> Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer
>>
>=20
>=20
>=20
>=20
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>=20
>=20

--=20
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 N=C3=BCrnberg, Germany
(HRB 36809, AG N=C3=BCrnberg)
Gesch=C3=A4ftsf=C3=BChrer: Felix Imend=C3=B6rffer


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