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

On Wed, Sep 4, 2019 at 7:14 PM Davidlohr Bueso dave@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