linux-kernel - Re: i915_driver_irq_handler: irq 42: nobody cared

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Message-ID: <20120503211537.GN4983@phenom.ffwll.local>
Date:	Thu, 3 May 2012 23:15:38 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Jiri Slaby <jirislaby@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: i915_driver_irq_handler: irq 42: nobody cared

On Thu, May 03, 2012 at 09:56:08PM +0200, Jiri Slaby wrote:
> On 04/11/2012 12:40 PM, Daniel Vetter wrote:
> > On Tue, Apr 10, 2012 at 01:34:11PM -0700, Jesse Barnes wrote:
> >> On Tue, 10 Apr 2012 22:32:12 +0200
> >> Daniel Vetter <daniel@...ll.ch> wrote:
> >>
> >>> On Tue, Apr 10, 2012 at 09:52:40PM +0200, Jiri Slaby wrote:
> >>>> Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
> >>>> <TAbort- <MAbort- >SERR- <PERR- INTx-
> >>>>
> >>>> I tried 3.2 and 3.3. Although the spurious interrupts were always
> >>>> there, they occurred with frequency lower by a magnitude (15 vs. 300
> >>>> after X starts). So I bisected that and it lead to a commit which
> >>>> fixes bad tiling for me:
> >>>> http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=for-jiri&id=79710e6ccabdac80c65cd13b944695ecc3e42a9d
> >>>
> >>> Pipelined fencing is pretty much just broken and we'll completely rip it
> >>> out in 3.5. Does this also happen with 3.4-rc2?
> >>
> >> Does INTx- stay that way?  Or does it frequently read INTx+ if you
> >> sample it a lot?  If it stays as INTx-, then something other than the
> >> GPU is getting stuck (though it's possible this could be related to
> >> pipelined fencing, if the fences are programmed to point at some funky
> >> memory space).
> 
> Hi and sorry for the delay. It stays INTx-. And I tested that with patch
> removing fencing.
> 
> > Shot in the dark, let's disable msi a bit. Can you try the below patch?
> 
> Yeah, no IRQ_NONE at the end of i915_driver_irq_handler now. So MSI is
> busted, either in the card, the chipset or the kernel. Any idea how to
> find out?

Ok, so MSI is busted. Can you please paste lspci -nn for you intel gpu?
-Daniel
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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