[Mesa-dev] [Nouveau] [PATCH v3 0/2] nouveau: support for custom VRAM domains

[Ben Skeggs]

On 19 June 2015 at 21:51, Martin Peres <martin.peres at free.fr> wrote:
> On 19/06/2015 13:02, Alexandre Courbot wrote:
>>
>> New revision of this patchset that prevents VRAM objects from being
>> allocated on VRAM-less systems like Tegra. This is required for Mesa
>> to work on such systems.
>>
>> Changes since v2:
>> - Use vram_size to detect systems without VRAM and set the correct
>>    domain instead of expecting each chip to set its domain explicitly.
>
>
> This question may have been asked a ton of times, but what is the difference
> with the nvac (Ion)?
>
> Would the nvac have some reserved memory for its usage by the bios which
> would then be used as "VRAM"?
PFB on the dGPU IGPs has facilities to fake VRAM from an area of
"stolen" system memory reserved by the SBIOS.  GK20A/GM20B do not do
this, and require direct (or, via a mmu, whatever) access to system
memory.

Ben.

>
> In any case, the patchseries sounds simple-enough to be maintainable.
>
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