[Intel-gfx] [RFC PATCH 098/162] drm/i915/gtt: map the PD up front

[Matthew Auld]

On Fri, 27 Nov 2020 at 13:32, Chris Wilson <chris at chris-wilson.co.uk> wrote:
>
> Quoting Matthew Auld (2020-11-27 12:06:14)
> > We need to general our accessor for the page directories and tables from
> > using the simple kmap_atomic to support local memory, and this setup
> > must be done on acquisition of the backing storage prior to entering
> > fence execution contexts. Here we replace the kmap with the object
> > maping code that for simple single page shmemfs object will return a
> > plain kmap, that is then kept for the lifetime of the page directory.
> >
> > Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>
> We are going to really struggle with this on 32b :(

Just go back to mapping everything on demand like we did previously,
and unmap as soon as we are done with the current directory across
alloc/insert/clear?

> -Chris
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