Re: [Nouveau] [PATCH v3 0/2] nouveau: support for custom VRAM domains

[Martin Peres <martin.peres@free.fr>]

On 19/06/2015 19:27, Alexandre Courbot wrote:
> On Fri, Jun 19, 2015 at 9:38 PM, Ben Skeggs <skeggsb@gmail.com> wrote:
>> On 19 June 2015 at 21:51, Martin Peres <martin.peres@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.
> Exactly. While dGPU do actually carve out a range of system memory to
> be exclusively used as "fake" VRAM, Tegra GPUs have access to the
> whole system memory which is shared with the other IPs of the SoC,
> which requires a different management strategy. Hence the choice to
> simply wipe out the concept of VRAM and use everything as system
> memory.
Very well, thanks Ben and Alexandre!

The series is:

Reviewed-by: Martin Peres <martin.peres@free.fr>
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