[PATCH v2 0/3] ast, mgag200: Map console BO while it's being displayed

[Daniel Vetter]

On Wed, Sep 4, 2019 at 7:14 PM Davidlohr Bueso <dave at stgolabs.net> wrote:
> On Wed, 04 Sep 2019, Daniel Vetter wrote:
> >I'm also not sure whether we have a real problem here, it's just debug
> >noise that we're fighting here?
>
> It is non stop debug noise as the memory range in question is being added +
> deleted over and over. I doubt we want to be burning cycles like this.

Yeah the proper fix is setting up an io_mapping in ttm (or drivers) so
the pat tracking is cached, and then using the right pte wrangling
functions. But that's a lot more involved fix, and from all the
testing we've done the pte rewriting itself doesn't seem to be the
biggest issue with mgag200 being slow ...
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch