evergreen acceleration support

[Dave Witbrodt]

On 08/23/2010 01:38 AM, Dave Witbrodt wrote:
> On 08/20/2010 05:21 PM, Alex Deucher wrote:
>> I've just pushed out the initial evergreen (radeon HD5xxx)
>> acceleration support for EXA and Xv to the evergreen_accel branch of
>> xf86-video-ati. Full support for EXA and Xv is available. To use it,
>> you'll need 2.6.35 with kms enabled. There are still some GPU hangs
>> in some cases that we haven't sorted out yet. Richard will be pushing
>> out mesa support as soon as he finishes rebasing his tree against mesa
>> master. We'll be releasing updated register specs eventually, but as
>> you can see, most of the registers and bit fields are the same as
>> r6xx/r7xx. Happy Hacking!
>>
>> Alex
>
> Crashes for me when the boot scripts start 'xdm'. Attached tarball has
> 'dmesg' output, copy of 'Xorg.0.log', and copy of 'xdm.log' (with same
> backtrace as Xorg.0.log).
>
> Should I put this on Bugzilla, or is evergreen-accel too new?
>
> Hardware:
> Radeon HD 5750
>
> Software:
> linux 2.6.35.2
> [merged with drm-radeon-testing merged up to c9f9e91; have also reverted
> 5b1714d, and added patch to fix pink vert. line -- not sure if there are
> git commits available yet]
> libdrm 2.4.21
> mesa 7.9-devel, git be99100
> xorg-server 1.9.0
> xf86-video-radeon 6.13.99, branch evergreen-accel (bdd41fec)
>
> Note: libdrm was built against a previous kernel; I can rebuild it
> tomorrow if this is a likely cause of the crash.
>
> Except for this handful of packages I rebuild myself, I am using Debian
> unstable/experimental. Many of the packages are provided with *-dbg
> versions, but 'xdm' is not one of those. Possibly I could attempt to
> rebuild an unstripped version of 'xdm' myself; I certainly can install
> debug versions of xorg-server and radeon, but will the backtrace alone
> make use of the debugging symbols? I'm not quite sure how I can use
> 'gdb' in a situation like this to get a better backtrace, but if there's
> a way I'd be glad to try.

   New steps:

- rebuilt libdrm against current kernel
- rebuilt mesa, correcting the warnings about whitespace between 
backslashes and newlines
- rebuilt xorg-server
- rebuilt radeon DDX


   Results:

Still crashes as before.  Apparently old libdrm was OK.  I didn't think 
Mesa was at fault either:  I doubt 'xdm' does much 3D work!  ;-)

Installing debugging symbols for the X server and the radeon driver 
prevented the backtrace from showing up at all, for some reason.

At the moment, I don't know how to use 'gdb' to get a better backtrace. 
  Is that even possible?


Dave W.