[Intel-gfx] [RFC 3/5] drm/i915: Add support for CPU mapping to DRM_IOCTL_I915_GEM_MMAP_GTT

Chris Wilson chris at chris-wilson.co.uk
Wed Jan 27 08:40:58 PST 2016

On Wed, Jan 27, 2016 at 03:24:43PM +0000, Tvrtko Ursulin wrote:
> On 26/01/16 16:59, Chris Wilson wrote:
> >On Tue, Jan 26, 2016 at 04:23:28PM +0000, Tvrtko Ursulin wrote:
> >>Oh yeah, need to pin the pages..
> >
> >But only whilst inserting. Once inserted they need to be evicted, and I
> >was wondering whether we should do the zap on put_pages(). If we don't,
> >it means that the shrinker is neutered.
> Ah I forgot this in v2. So we would need something like
> obj->fault_mappable so that i915_gem_release_mmap runs, yes?

Something like that. I don't have a good idea, but I was wondering if
plonking a callback into the offset-node would be useful, and walking a
list of nodes on the object.

Chris Wilson, Intel Open Source Technology Centre

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