linux-kernel - Re: [Intel-gfx] [WARNING 4.1-rc2] i915: Unclaimed register detected before writing to register 0xc4040

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Date:	Fri, 8 May 2015 08:55:46 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...el.com>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [WARNING 4.1-rc2] i915: Unclaimed register detected
 before writing to register 0xc4040

On Thu, May 7, 2015 at 9:40 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>  ------------[ cut here ]------------
>  WARNING: CPU: 2 PID: 0 at /work/autotest/nobackup/linux-test.git/drivers/gpu/drm/i915/intel_uncore.c:566 hsw_unclaimed_reg_debug.isra.10+0x6c/0x84()
>  Unclaimed register detected before writing to register 0xc4040
>  Modules linked in: microcode r8169
>  CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.1.0-rc2-test+ #4
>  Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014
>   0000000000000236 ffff880215203c68 ffffffff81ba8161 0000000000000000
>   ffff880215203cb8 ffff880215203ca8 ffffffff81080dbb 0000000000000000
>   ffffffff81626bc6 ffff88020de60068 00000000000c4040 0000000000000001
>  Call Trace:
>   <IRQ>  [<ffffffff81ba8161>] dump_stack+0x4c/0x65
>   [<ffffffff81080dbb>] warn_slowpath_common+0xa1/0xbb
>   [<ffffffff81626bc6>] ? hsw_unclaimed_reg_debug.isra.10+0x6c/0x84
>   [<ffffffff81080e78>] warn_slowpath_fmt+0x46/0x48
>   [<ffffffff81626bc6>] hsw_unclaimed_reg_debug.isra.10+0x6c/0x84
>   [<ffffffff81629ac4>] hsw_write32+0x86/0xcf
>   [<ffffffff81616246>] cpt_irq_handler+0x1e8/0x1f5
>   [<ffffffff81616347>] ivb_display_irq_handler+0xf4/0x11b
>   [<ffffffff81619837>] ironlake_irq_handler+0x187/0x24d
>   [<ffffffff810ceba8>] handle_irq_event_percpu+0xf7/0x2a3
>   [<ffffffff810ced95>] handle_irq_event+0x41/0x64
>   [<ffffffff810d17e3>] handle_edge_irq+0xa0/0xb9
>   [<ffffffff8103f961>] handle_irq+0x11d/0x128
>   [<ffffffff8109d5a0>] ? atomic_notifier_call_chain+0x14/0x16
>   [<ffffffff81bc2fde>] do_IRQ+0x4e/0xc4
>   [<ffffffff81bc11f0>] common_interrupt+0x70/0x70
>   <EOI>  [<ffffffff819c9788>] ? cpuidle_enter_state+0xd8/0x135
>   [<ffffffff819c9784>] ? cpuidle_enter_state+0xd4/0x135
>   [<ffffffff819c9811>] cpuidle_enter+0x17/0x19
>   [<ffffffff810b545a>] cpuidle_idle_call+0xf2/0x180
>   [<ffffffff810b5613>] cpu_idle_loop+0x12b/0x164
>   [<ffffffff810b565f>] cpu_startup_entry+0x13/0x14
>   [<ffffffff81066a3a>] start_secondary+0x102/0x106
>   [<ffffffff81066938>] ? set_cpu_sibling_map+0x35e/0x35e
>  ---[ end trace 77c6a96cf41e96d1 ]---
>
> I'm still triggering warnings in the i915 code. :-(

Please retry with snd-hda-intel blacklisted. At least last time I
checked that was the only culprit left, i915 is just the messenger
here. The other one was stupid things done by the bios, but we should
correctly clear that up since a long time.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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