[Bug 96878] [Bisected: cc2d0e6][HSW] "GPU HANG" msg after autologin to gnome-session

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96878

--- Comment #1 from Arek Ruśniak <arek.rusi at gmail.com> ---
And it is all happen after this:

cc2d0e64c0b10884bc12d80018b622911e8b152f is the first bad commit
commit cc2d0e64c0b10884bc12d80018b622911e8b152f
Author: Topi Pohjolainen <topi.pohjolainen at intel.com>
Date:   Fri May 20 11:15:35 2016 +0300

    i965/blorp/gen7+: Stop trashing push constant allocation

    Packet 3DSTATE_CONSTANT_PS is still emitted explicitly as ps stage
    itself is enabled and hardware may try to prefetch constants from
    the buffer. From the BSpec: 3D Pipeline - Windower -
    3DSTATE_PUSH_CONSTANT_ALLOC_PS

      "Specifies the size of the PS constant buffer. This value will
       determine the amount of data the command stream can pre-fetch
       before the buffer is full."

    This is not possible on gen6. From the BSpec about 3DSTATE_CONSTANT_PS:

    "This packet must be followed by WM_STATE."

    Binding table emissions for stages other than PS can be now dropped,
    they were only needed for the 3DSTATE_CONSTANT_XS to be effective:

    From the BSpec:

      "The 3DSTATE_CONSTANT_* command is not committed to the shader unit
       until the corresponding (same shader) 3DSTATE_BINDING_TABLE_POINTER_*
       command is parsed."

    Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

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