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Message-ID: <4FA2E2D8.5050303@suse.cz>
Date: Thu, 03 May 2012 21:56:08 +0200
From: Jiri Slaby <jslaby@suse.cz>
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To: Jesse Barnes <jbarnes@virtuousgeek.org>,
        Chris Wilson <chris@chris-wilson.co.uk>,
        Jiri Slaby <jirislaby@gmail.com>, LKML <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org
Subject: Re: i915_driver_irq_handler: irq 42: nobody cared
References: <4F758400.3080907@suse.cz> <1333104359_155028@CP5-2952> <20120409101119.47e770b2@jbarnes-desktop> <4F83F3B5.8080704@suse.cz> <20120410092619.26a15165@jbarnes-desktop> <4F8477D1.4080102@suse.cz> <20120410113448.540e4c1d@jbarnes-desktop> <4F848F88.7060009@suse.cz> <20120410203212.GN4115@phenom.ffwll.local> <20120410133411.52dc52ed@jbarnes-desktop> <20120411104012.GI4296@phenom.ffwll.local>
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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@ffwll.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?

thanks,
-- 
js
suse labs