[Intel-gfx] I've got the RC6 bug

Chris Wilson chris at chris-wilson.co.uk
Wed Jan 18 12:17:52 CET 2012

On Wed, 18 Jan 2012 01:24:26 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Wed, Jan 18, 2012 at 01:16:02AM +0100, CC wrote:
> > I attached the error state.
> Nice one, your gpu seems to have simply disappeared. And the ringbuffer
> contains a rather peculiar cmd sequence. Putting Chris (maybe he
> recognizes the pattern) and Ben (he's got a patch in the works to dump a
> debug register that might be interesting here) on cc. It's too late atm
> for me to think about this some more.

Not simply disappeared, someone clobbered it with an extremely large
hammer. The GPU was killed by a stray write to address 0 which took out
the render ring buffer and its hws page. So my first thought is a
missing relocation, and i965g springs to mind.

Chris Wilson, Intel Open Source Technology Centre

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