linux-kernel - Re: [PATCH v3 1/5] gem/vram: pin to vram in vmap

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Date:   Thu, 27 Jun 2019 17:59:05 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>, Sean Paul <sean@...rly.run>,
        open list <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3 1/5] gem/vram: pin to vram in vmap


Am 27.06.19 um 17:54 schrieb Thomas Zimmermann:
> Hi
> 
> Am 27.06.19 um 17:16 schrieb Gerd Hoffmann:
>>   Hi,
>>
>>>  1) Introduce a default_placement field in struct drm_gem_vram_helper
>>> where this flag can be configured. I'd favor this option.
>>
>>>  2) Introduce a separate callback function for pinning to vram. The
>>> driver would have to set the correct function pointers.
>>
>>>  3) Pin the fb console buffer manually from within the bochs driver.
>>
>> Hmm.  Before calling drm_fbdev_generic_setup() the bo doesn't exist yet
>> and when the function returns it is already vmapped and pinned I think.
>>
>> So (3) isn't easily doable.  (1) looks best to me.
> 
> For my patches, it's OK to have to BO pinned to VRAM by default. As the
> BO will be unmapped most of the time, I can change this flag at any time.

So, yeah, option 1 ...

> Best regards
> Thomas
> 
>> cheers,
>>   Gerd
>>
> 
> 
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> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)


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