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

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Date:	Fri, 30 Mar 2012 14:11:47 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Chris Wilson <chris@...is-wilson.co.uk>
CC:	Jiri Slaby <jirislaby@...il.com>,
	Keith Packard <keithp@...thp.com>,
	dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>, daniel@...ll.ch
Subject: Re: i915_driver_irq_handler: irq 42: nobody cared

On 03/30/2012 12:45 PM, Chris Wilson wrote:
> On Fri, 30 Mar 2012 11:59:28 +0200, Jiri Slaby <jslaby@...e.cz> wrote:
>> I don't know what to dump more, because iir is obviously zero too. What
>> other sources of interrupts are on the (G33) chip?
> 
> IIR is the master interrupt, with chained secondary interrupt statuses.
> If IIR is 0, the interrupt wasn't raised by the GPU.

This does not make sense, the handler does something different. Even if
IIR is 0, it still takes a look at pipe stats.

And this is MSI, so there can be no other source of the interrupt.
(Except broken IRQ routing.) I may try to boot with MSIs off if you
think it's important.

thanks,
-- js suse labs


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