[Bug 8397] New: r430 infinite loop under radeon_do_cp_idle

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https://bugs.freedesktop.org/show_bug.cgi?id=8397          
     
           Summary: r430 infinite loop under radeon_do_cp_idle
           Product: DRI
           Version: XOrg CVS
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DRM modules
        AssignedTo: dri...@li...
        ReportedBy: ari...@gm...


The box contains a Radeon X800 XL (PCIE), an Athlon64, and a VIA
VT8251/K8M800/whatchamacallit motherboard. It's running a recent Gentoo Linux, a
vanilla 2.6.18 kernel (aside drm), X.org 7.1.1 with the corresponding DRI, plus
libdrm and drm modules pulled from git today.

Starting Xorg (just the server, no clients) causes CPU use to go to 100% in
system according to top. The system can otherwise still be used with ssh, but
the X server can't be killed even with kill -9. Here's some <a
href="http://www.student.oulu.fi/~arirahik/xorg_problem/strace.txt.gz">strace</a>
(65k gzipped) and  <a
href="http://www.student.oulu.fi/~arirahik/xorg_problem/gdb.txt">gdb</a>(10k)
output about the process. strace indicates that we're stuck trying to use ioctl
0x6444 on /dev/dri/card0, getting -EBUSY every time, and gdb indicates that
we're under some XAA code that's helping with cursor handling.

I defined RADEON_FIFO_DEBUG 1 in radeon_cp.c, modprobed drm.ko with debug=1, and
<a href="http://www.student.oulu.fi/~arirahik/xorg_problem/kmsg.txt">captured
some /proc/kmsg output</a>(35k) from starting Xorg. It's pretty opaque to me,
though, so I don't know how to go on from here.

I've tried various settings in xorg.conf: SWCursor True, BusType PCI, BusType
PCIE, and AccelMethod EXA. Apparently the same bug (I only checked that top
showed 100% CPU usage in system) manifested in every case, though with EXA it
took until I actually spawned a window, while with XAA it happens soon after the
X server has started up.          
     
     
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