Latest i386 DRMKMS results

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

With the recent updates to DRMKMS stuff, I set about seeing if the
situation was improved from before on my DELL OptiPlex GX-260.

This time the screen switched to a graphics mode and displayed (replayed?)
kernel messages before displaying a screen full of panic messages after
which the system was unresponsive.

Since serial console mode had been un-broken, I hooked that up and
captured the kernel messages.  Relevant excerpts:

[...]
NetBSD 6.99.40 (DRMKMS) #1: Fri Apr 25 21:10:47 CDT 2014
        
sysop%verthandi.technoskunk.fur@localhost:/d0/build/current/obj/i386/sys/arch/i386
/compile/DRMKMS
total memory = 2046 MB
avail memory = 1996 MB
mainbus0 (root)
ACPI: RSDP 0xfeba0 000014 (v00 DELL  )
ACPI: RSDT 0xfd509 000038 (v01 DELL    GX260   00000009 ASL  00000061)
[...]
pchb0 at pci0 dev 0 function 0: Intel 82845G/GL DRAM Controller / Host-Hub I/F B
ridge (rev. 0x01)
agp0 at pchb0: detected 892k stolen memory
agp0: aperture at 0xf0000000, size 0x8000000
i915drmkms0 at pci0 dev 2 function 0: Intel 82845G/GL Integrated Graphics Device
 (rev. 0x01)    
drmkms0 at i915drmkms0
drm: Memory usable by graphics device = 128M
drm: Supports vblank timestamp caching Rev 1 (10.10.2010).
drm: Driver supports precise vblank timestamp query.
i915drmkms0: unable to map ROM
drm: failed to find VBIOS tables
drm: initialized overlay support
drmkms0: interrupting at ioapic0 pin 16 (i915)
wsdisplay0 at i915drmkms0 kbdmux 1
drmkms0: info: registered panic notifier
[...]
render error detected, EIR: 0x00000010
DRM error in i915_report_and_clear_eir: EIR stuck: 0x00000010, masking
DRM error in i915_get_vblank_timestamp: Invalid crtc 1
fatal page fault in supervisor mode
trap type 6 code 0 eip c09f1566 cs 8 eflags 10206 cr2 7bdd4070 ilevel 8 esp 
c33caa80
curlwp 0xc0ed10c0 pid 0 lid 1 lowest kstack 0xc10f62c0
kernel: supervisor trap page fault, code=0
Stopped in pid 0.1 (system) at  netbsd:cv_wakeup_one+0x4a:      cmpl    
%ebx,d0(%esi)
db{0}> bt
fatal page fault in supervisor mode
trap type 6 code 0 eip c029ed44 cs 8 eflags 10246 cr2 1f448440 ilevel 8 esp 0
curlwp 0xc0ed10c0 pid 0 lid 1 lowest kstack 0xc10f62c0
kernel: supervisor trap page fault, code=0
Faulted in DDB; continuing...
db{0}>


Full console log here:

  http://bobdbob.com/~jdbaker/nbsd-debug/gx260a-drmkms-fail.txt


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