[Bug 101283] skylake: page fault accessing address 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101283

--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
As for a), the comments in i965 are a bit better:

   /* Emit a PIPE_CONTROL with "Post-Sync Operation" set to "Write Immediate
    * Data", and no other bits set.  This causes 3DSTATE_WM_HZ_OP's state to
    * take effect, and spawns a rectangle primitive.
    */

3DSTATE_WM_HZ_OP is kind of weird - it overrides all the state, and sets up a
rectangle primitive that's about ready to fire...but it needs a flush to
actually push it over the edge and make it happen.  No idea why they designed
it this way.

b) It's absolutely a problem - that code is definitely broken.  Good catch!

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