Bug#724944: [Intel-gfx] Patch for crashing intel server

[Bas Wijnen <wijnen@debian.org>]

Hi Chris,

I got a black screen while using your patch.
/sys/kernel/debug/dri/0/i915_gem_objects contents are shown below.  The first
time is while the video is running; the second after stopping it.  AFAICS,
there is no difference between them.

However, after starting a new video, there is a difference in active objects;
not sure if it is related (I don't really know what any of it means).  That is
the third one.

Thanks,
Bas

root@star:/sys/kernel/debug/dri/0# cat i915_gem_objects 
220 objects, 36782080 bytes
131 [131] objects, 34430976 [34430976] bytes in gtt
  0 [0] active objects, 0 [0] bytes
  131 [131] inactive objects, 34430976 [34430976] bytes
49 unbound objects, 638976 bytes
1 purgeable objects, 4096 bytes
6 pinned mappable objects, 15884288 bytes
118 fault mappable objects, 27901952 bytes
536870912 [268435456] gtt total

Xorg: 217 objects, 36642816 bytes (0 active, 30703616 inactive, 5922816 unbound)
root@star:/sys/kernel/debug/dri/0# cat i915_gem_objects 
220 objects, 36782080 bytes
131 [131] objects, 34430976 [34430976] bytes in gtt
  0 [0] active objects, 0 [0] bytes
  131 [131] inactive objects, 34430976 [34430976] bytes
49 unbound objects, 638976 bytes
1 purgeable objects, 4096 bytes
6 pinned mappable objects, 15884288 bytes
118 fault mappable objects, 27901952 bytes
536870912 [268435456] gtt total

Xorg: 217 objects, 36642816 bytes (0 active, 30703616 inactive, 5922816 unbound)
root@star:/sys/kernel/debug/dri/0# cat i915_gem_objects 
220 objects, 36782080 bytes
131 [131] objects, 34430976 [34430976] bytes in gtt
  2 [2] active objects, 32768 [32768] bytes
  129 [129] inactive objects, 34398208 [34398208] bytes
49 unbound objects, 638976 bytes
1 purgeable objects, 4096 bytes
6 pinned mappable objects, 15884288 bytes
118 fault mappable objects, 27901952 bytes
536870912 [268435456] gtt total

Xorg: 217 objects, 36642816 bytes (32768 active, 30670848 inactive, 5922816 unbound)