[PATCH 5/5] drm/vgem: properly implement mmap

[Ben Widawsky]

On 02/09/2012 12:36 AM, Chris Wilson wrote:
> On Thu,  9 Feb 2012 00:19:31 +0100, Ben Widawsky <ben at bwidawsk.net> wrote:
>> Mostly copied from i915 gtt mmaps, this will properly fault in pages as
>> the user tries to use them. The only thing of note are that no
>> prefaulting occurs, so perhaps some kind of madvise will happen later if
>> needed.
> 
> What's the goal here? Why not copy the simpler (from the driver
> perspective) CPU mmaps? I presume that this will be required for dmabuf
> in some form?
> -Chris
> 

That was what everyone seemed to want from the original RFC. I think
Eric said something about helping out valgrind. I don't recall the
other reasons.