Re: [PATCH] drm/radeon: fix VM page table setup on SI

["Michel Dänzer" <michel@daenzer.net>]

On Don, 2012-06-28 at 17:53 -0400, alexdeucher@gmail.com wrote: 
> From: Alex Deucher <alexander.deucher@amd.com>
> 
> Cayman and trinity allow for variable sized VM page
> tables, but SI requires that all page tables be the
> same size.  The current code assumes variablely sized
> VM page tables so SI may end up with part of each page
> table overlapping with other memory which could end
> up being interpreted by the VM hw as garbage.
> 
> Change the code to better accomodate SI.  Allocate enough
> space for at least 2 full page tables and always set
> last_pfn to max_pfn on SI so each VM is backed by a full
> page table.  This limits us to only 2 VMs active at any
> given time on SI.  This will be rectified and the code can
> be reunified once we move to two level page tables.
> 
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

This change breaks the radeonsi driver for me. egltri_screen (the
'golden' test for radeonsi at least basically working) locks up the
GPU. 

I don't have any details about the lockup yet, as the GPU reset attempt
hangs the machine. Any ideas offhand what radeonsi might be doing wrong?


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer