[PATCH] drm/i915/gt: Report full vm address range

[Andi Shyti]

Hi Michal,

On Mon, Mar 18, 2024 at 05:21:54AM +0000, Mrozek, Michal wrote:
> > > Lionel, Michal, thoughts?
> Compute UMD needs to know exact GTT total size.

the problem is that we cannot apply the workaround without
reserving one page from the GTT total size and we need to apply
the workaround.

If we provide the total GTT size we will have one page that will
be contended between kernel and userspace and, if userspace is
unaware that the page belongs to the kernel, we might step on
each other toe.

The ask here from kernel side is to relax the check on the
maxNBitValue() in userspace and take what the kernel provides.

Thanks,
Andi