[Bug 87564] [hsw gt1] GPU HANG: ecode 0:0x85dffffc in xbmc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87564

--- Comment #56 from Ben Widawsky <ben at bwidawsk.net> ---
Created attachment 111596
  --> https://bugs.freedesktop.org/attachment.cgi?id=111596&action=edit
Always initialize streamout buffers

Another longshot.

As the commit message says, there is garbage in the last error state. As an
example:
0x001a4228:      0x79180002: 3DSTATE_SO_BUFFER
0x001a422c:      0x44954ffe:    DWord 1:
                                   SO Buffer Index: 2
                                   SO Buffer Object Control State: 2
                                   Surface Pitch: 4094
0x001a4230:      0x169a840f:    DWord 2:
                                   Surface Base Address: 0x169a840c
0x001a4234:      0xcde4100d:    DWord 3:
                                   Surface End Address: 0xcde4100c

This patch should initialize the SOl state regardless of whether we use xfb.
It's probably something we want to put in the kernel null ctx setup, but for
now we can just test it in mesa.

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