linux-kernel - [LKP] [drm/i915] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

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Date:	Wed, 11 Feb 2015 16:17:32 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Matt Roper <matthew.d.roper@...el.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [drm/i915] [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
 *ERROR* CPU pipe B FIFO underrun

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 32b7eeec4d1e861230b09d437e95d76c86ff4a68 ("drm/i915: Refactor work that can sleep out of commit (v7)")

With the commit, we found the following dmesg when perform piglit testing.

<3>[   85.884495] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
<3>[  126.770351] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B


testbox/testcase/testparams: snb-drag/piglit/performance-igt-039

2f3408c7ef471dea  32b7eeec4d1e861230b09d437e  
----------------  --------------------------  
       fail:runs  %reproduction    fail:runs
           |             |             |    
           :20         100%          20:20    kmsg.drm:intel_set_pch_fifo_underrun_reporting[i915]]*ERROR*uncleared_pch_fifo_underrun_on_pch_transcoder_B
           :20         100%          20:20    kmsg.drm:intel_cpu_fifo_underrun_irq_handler[i915]]*ERROR*CPU_pipe_B_FIFO_underrun
           :20         100%          20:20    piglit.igt/kms_cursor_crc/cursor-256-random.dmesg-warn
          1:20          -5%            :20    kmsg.irq#:nobody_cared(try_booting_with_the"irqpoll"option)
          1:20          -5%            :20    kmsg.handlers
          1:20          -5%            :20    kmsg.Disabling_IRQ

snb-drag: Sandy Bridge
Memory: 6G

To reproduce:

	apt-get install ruby ruby-oj
	git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
	cd lkp-tests
	bin/setup-local job.yaml # the job file attached in this email
	bin/run-local   job.yaml


Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.


Thanks,
Huang, Ying



View attachment "job.yaml" of type "text/plain" (1599 bytes)

View attachment "reproduce" of type "text/plain" (130 bytes)

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