EXA patches

[Alex Deucher]

2009/8/5 Michel Dänzer <michel at daenzer.net>:
> On Wed, 2009-08-05 at 01:39 -0400, Alex Deucher wrote:
>> 2009/8/4 Michel Dänzer <michel at daenzer.net>:
>> > On Tue, 2009-08-04 at 11:54 +1000, Dave Airlie wrote:
>> >> On Tue, 2009-08-04 at 09:49 +0800, Joel Feiner wrote:
>> >> > 2009/8/4 Michel Dänzer <michel at daenzer.net>
>> >> >         <snip>
>> >> >
>> >> >         I wonder if maybe the slowdown I'm seeing is because the
>> >> >         radeon driver
>> >> >         is temporarily lacking UploadToScreen and DownloadFromScreen
>> >> >         hooks with
>> >> >         KMS, though I'm not sure what those would be used for with
>> >> >         text
>> >> >         rendering.
>> >> >
>> >> > Off-topic, but if I may enquire out of intellectual curiosity: why
>> >> > doesn't the KMS version of Radeon have UTS and DFS acceleration?
>> >>
>> >> The code is in the branch, but its really ugly, I was hoping to actual
>> >> do it cleaner which might involve a new kernel interface to ask for the
>> >> current placement of a buffer object so we can decide whether to just
>> >> memcpy or we need to blit for DFS. I'm not sure I saw a good reason for
>> >> UTS, doing Host data blits isn't really useful with BOs at least with
>> >> the current code.
>> >
>> > One potential benefit of UTS is pipelining. But I agree that DFS is
>> > probably more important.
>>
>> FWIW... untested.
>> http://www.botchco.com/alex/xorg/radeon_kms_uts.diff
>
> You want to avoid any explicit flushes or even waits for destination BO
> idle, those would defeat any potential pipelining benefits. Otherwise
> looks like it could work though. :)

Updated patch at the same link.

Alex