Selecting memory manager for embedded DRM device

[Rob Clark]

On Sun, Feb 2, 2014 at 6:50 PM, Dmitry Eremin-Solenikov
<dbaryshkov at gmail.com> wrote:
> Hello,
>
> I'm looking onto writing DRM/KMS drivers for few pieces of
> embedded equipment. I stumbled upon selecting GEM/TTM/whatever
> for them. Could you please guide me?

The common choices are either:

  * TTM + GEM userspace interface (nouveau and radeon)
  * or just GEM (intel, and most of the ARM devices)

TTM seems to be mostly advantageous if you need to manage migration
between VRAM / GART / system RAM.  But it sounds like you are talking
about a UMA system, so maybe TTM doesn't help you as much.

BR,
-R


> From my point of view, there are two major cases:
>
> 1) Device with embedded/separate VRAM.
>
> 2) Device using system memory w/o any restrictions.
>
> Those are embedded devices hanging on memory bus,
> so no such things as AGP, aperture exist.
>
> I'm looking for advice on selecting proper MM.
>
> --
> With best wishes
> Dmitry
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