On Fri, Dec 19, 2014 at 09:26:01AM -0800, Ben Widawsky wrote: > On Fri, Dec 19, 2014 at 08:20:04AM +0000, Chris Wilson wrote: > > On Thu, Dec 18, 2014 at 06:20:18PM -0800, Ben Widawsky wrote: > > > From: Ben Widawsky <ben@xxxxxxxxxxxx> > > > > > > The docs specify this needs to be set on HSW GT1 parts. I've implemented it as > > > such since it should only be needed when using RC6, but it can probably go > > > anywhere. > > > > > > This patch fixes extremely reproducible hangs on our Jenkins setup. > > > > > > The interesting failure signature is: > > > IPEHR: 0x780c0000 (3DSTATE_VF) > > > INSTDONE_0: 0xffdfbffa (SVG + VS) > > > > We see the same bug on IVB, and the bug (verified on hsw gt1) persists with i915.enable_rc6=0. > > -Chris > > I would claim it's not the same bug on IVB. The workaround very specifically > says HSW GT1 only. The failure signature itself is pretty generic, it just > suggests the VS went off and did something stupid, and the VF was unable to fill > the URB. (That's just my best guess) I do apologize if I inadvertently made a > connection to the IVB bug issue. The failure message matches the context hang bug: "dies on last instruction in the context restore" and probably has nothing to do with the VS. > So, what is your point? I'm willing to concede we don't know all the facts, but > the [previous version of this] patch demonstrably fixes hangs on HSW GT1. Just a patch a few days ago that to fix a very ontologically similar bug for ivb+. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
