[Nouveau] some patches and remarks for ng

[Maarten Maathuis]

On 01/05/2009 01:24 AM, Ben Skeggs wrote:
> On Sat, 2009-01-03 at 17:53 +0100, Maarten Maathuis wrote:
>    
>> 1 patch for libnouveau_drm, 4 for drm and one work in progress patch
>> for the ddx.
>>
>> Getting nv50 to run proved to be more difficult than i thought (at
>> some point i stopped because it would require significant changes), i
>> just have a few remarks.
>>
>> - Buffer object access is not guarded by fences at all, which is a
>> major issue. You worked around that by using M2MF I suppose, but this
>> needs a structural fix.
>>      
> I have no idea where you got that idea from...
>    

So where is buffer object mapping waiting for any pending gpu activity?

>    
>> - Comments are scarce, please be more verbose. I know it's all very
>> obvious to the people that write the code, but for others it's less
>> obvious.
>>      
>
>    
>> - I think buffer object untiling should happen in userspace, which
>> will also allow some nice optimizations that EXA does (using damage to
>> selectively copy and such).
>>      
> Sure, I agree.  The drm is still going to need to know a bit more info
> on the buffer layout than it currently does regardless.
>
>    
>> - The WIP patch contains sysmem pixmaps, i fixed this for git xserver
>> (and nominated it for 1.6), but expect older versions to blow up due
>> to NULL'ing of devPrivate.ptr.
>> (http://cgit.freedesktop.org/xorg/xserver/commit/?id=3534a5e5d9c5af85149c799f324257f89507fa23)
>>
>> Consider the patches hints, and don't blindly apply them.
>>      
> libnouveau_drm 0001: I'll apply it, harmless changes
> drm 0001: Oops, missed that from an earlier change.  Will apply.
> drm 0002: I won't apply, we'll need to do a lot more extensive cleanup
> if we fail there.  What exactly is needed I'm not sure, haven't looked
> into it properly yet - hence the XXX
> drm 0003: NACK on the PRAMIN changes.  PRAMIN doesn't work *anything*
> like previously.  The current code is fine, no channel has access to the
> parts of VRAM mapped into PRAMIN.  On the VRAM size, thanks, that's
> left-over from when the code was supporting both the old mm and ttm at
> the same time.
> drm 0004: It doesn't hurt I guess.
>
>    
>> Maarten.
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>>      
>
>