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Message-ID: <f958598b0812020526x39f7ca2ag4534d39b5d5f3e01@mail.gmail.com>
Date: Tue, 2 Dec 2008 14:26:49 +0100
From: "fredi ml" <mailinglists.fredi@gmail.com>
To: linux-kernel@vger.kernel.org, "Eric Anholt" <eric@anholt.net>,
       dri-devel@lists.sourceforge.net
Subject: [i915 drm] irq 16: nobody cared with latest git kernels
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[Resending as the first one was rejected for being html. Forgot about
gmail defaults]

Hi all,
lately starting from kernel 2.6.28-rc6-00142-g9bd062d I'm getting this traces:

Dec  1 12:09:34 kotys irq 16: nobody cared (try booting with the
"irqpoll" option)
Dec  1 12:09:34 kotys Pid: 3617, comm: X Not tainted
2.6.28-rc6-00142-g9bd062d #17
Dec  1 12:09:34 kotys Call Trace:
Dec  1 12:09:34 kotys <IRQ>  [<ffffffff80262a11>] __report_bad_irq+0x3d/0x8c
Dec  1 12:09:34 kotys [<ffffffff80262b73>] note_interrupt+0x113/0x178
Dec  1 12:09:34 kotys [<ffffffff80263271>] handle_fasteoi_irq+0xa6/0xca
Dec  1 12:09:34 kotys [<ffffffff8020d8ab>] do_IRQ+0x7b/0xec
Dec  1 12:09:34 kotys [<ffffffff8020b9f6>] ret_from_intr+0x0/0xa
Dec  1 12:09:34 kotys <EOI> <3>handlers:
Dec  1 12:09:34 kotys [<ffffffffa036f497>]
(i915_driver_irq_handler+0x0/0x1f5 [i915])
Dec  1 12:09:34 kotys Disabling IRQ #16

-----------
Dec  1 19:14:11 kotys irq 16: nobody cared (try booting with the
"irqpoll" option)
Dec  1 19:14:11 kotys Pid: 4042, comm: firefox Not tainted
2.6.28-rc6-00184-gd9d060a #18
Dec  1 19:14:11 kotys Call Trace:
Dec  1 19:14:11 kotys <IRQ>  [<ffffffff80262a11>] __report_bad_irq+0x3d/0x8c
Dec  1 19:14:11 kotys [<ffffffff80262b73>] note_interrupt+0x113/0x178
Dec  1 19:14:11 kotys [<ffffffff80263271>] handle_fasteoi_irq+0xa6/0xca
Dec  1 19:14:11 kotys [<ffffffff8020d8ab>] do_IRQ+0x7b/0xec
Dec  1 19:14:11 kotys [<ffffffff8020b9f6>] ret_from_intr+0x0/0xa
Dec  1 19:14:11 kotys <EOI> <3>handlers:
Dec  1 19:14:11 kotys [<ffffffffa036c497>]
(i915_driver_irq_handler+0x0/0x1f5 [i915])
Dec  1 19:14:11 kotys Disabling IRQ #16

------------
Dec  2 13:31:23 kotys Pid: 6512, comm: ebuild Not tainted 2.6.28-rc7 #19
Dec  2 13:31:23 kotys Call Trace:
Dec  2 13:31:23 kotys <IRQ>  [<ffffffff80262a0d>] __report_bad_irq+0x3d/0x8c
Dec  2 13:31:23 kotys [<ffffffff80262b6f>] note_interrupt+0x113/0x178
Dec  2 13:31:23 kotys [<ffffffff8026326d>] handle_fasteoi_irq+0xa6/0xca
Dec  2 13:31:23 kotys [<ffffffff8020d8ab>] do_IRQ+0x7b/0xec
Dec  2 13:31:23 kotys [<ffffffff8020b9f6>] ret_from_intr+0x0/0xa
Dec  2 13:31:23 kotys <EOI> <3>handlers:
Dec  2 13:31:23 kotys [<ffffffffa036b497>]
(i915_driver_irq_handler+0x0/0x1f5 [i915])
Dec  2 13:31:23 kotys Disabling IRQ #16


Actually now that i notice all the log seems the same except the
kernel version that's from git. After this traces interrupt 16 is not
incrteasing in /proc/interrupts anymore (as suggested by the last log
line) and Xorg is all slugish, barely usable. Noticing that there were
modifications on the i915 driver i waited till now to report this but
none of the last patches got rid of this issue so here is the log.
Right now i booted adding irqpoll on the command line and i see in
dmesg this one:

Kernel command line: root=/dev/sda2 rootflags=data=writeback irqpoll
Misrouted IRQ fixup and polling support enabled
This may significantly impact system performance

Though everything seems normal for now. The trace happens usually when
the system is under load but it's not that predictable so for now i
cant tell if using irqpoll is avoiding hitting this issue. I'll let
you know if it happens again.
Just ask for info or whatever patches to test ecc. is needed, i'll be
glad to help.
And of course thank you guys for your work.

Frederik
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