Bug 98041

Summary:	[BAT][SKL] CPU pipe X fifo underrun
Product:	DRI	Reporter:	Tvrtko Ursulin <tvrtko.ursulin>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED FIXED	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	major
Priority:	high	CC:	intel-gfx-bugs, przanoni
Version:	DRI git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:	SKL	i915 features:	display/watermark

Description Tvrtko Ursulin 2016-10-04 08:45:14 UTC

Usual errors like:

[  520.080543] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

Happening sporadically in BAT under tests like:

kms_pipe_crc_basic@hang-read-crc-pipe-a
kms_pipe_crc_basic@suspend-read-crc-pipe-a
kms_pipe_crc_basic@nonblocking-crc-pipe-b
pm_rpm@basic-rte

First found build in the CI matrix is CI_DRM_1645.

Comment 1 Paulo Zanoni 2016-10-28 13:05:44 UTC

We merged a lot of SKL watermarks fixes after the bug report was opened, including a few specific ones that I believe are related to the problem mentioned, such as "drm/i915/gen9: fix DDB partitioning for multi-screen cases". I just looked at the CI logs for the tests mentioned by Tvrtko and I don't see these messages anymore.

Close as FIXED?

Comment 2 Tvrtko Ursulin 2016-11-09 09:28:31 UTC

I found one instance from 8th of November in https://intel-gfx-ci.01.org/CI/CI_DRM_1814/fi-skl-6770hq/igt@kms_pipe_crc_basic@suspend-read-crc-pipe-b.html.

Comment 3 Jani Saarinen 2016-12-22 08:26:01 UTC

Tvrtko, can you test now with latest drm-tip?

Comment 4 Tvrtko Ursulin 2017-01-04 10:15:24 UTC

I was never able to reproduce this myself but looking at the CI logs it seems that it doesn't appear any more so I am happy for it to be closed.

Comment 5 Tvrtko Ursulin 2017-01-12 08:46:32 UTC

Just saw it in CI here: https://intel-gfx-ci.01.org/CI/Patchwork_3453/fi-skl-6770hq/igt@drv_module_reload@basic-reload-final.html

Comment 6 Rami 2017-02-07 13:48:32 UTC

This is not reproduced on SKL with last setup:

 SKLS1:
------
Platform SKL Gigabyte
CPU: Intel(R) Core(TM) i5-6600 CPU @ 3.30GHz (family 6, model 94, stepping 3)
GPU: Intel® HD Graphics 530 - Intel Corporation Sky Lake Integrated Graphics (rev 06)
Motherboard version: H170N-WIFI-CF
Memory: 2x 4GB Kingston 9905622-055.A00G
Software
==========
Bios: F3 
Linux distribution: Ubuntu 16.04 64 bits
DMC 1.26 from https://01.org/sites/default/files/downloads/intelr-graphics-linux/skldmcver126.tar_1.bz2
GUC 6.1 from https://01.org/sites/default/files/downloads/intelr-graphics-linux/sklgucver61.tar.bz2
Kernel: drm-tip: 2017y-02m-06d-09h-59m-54s UTC integration manifest
commit 8b63c510e68d252b3d160c77f49198bc32c21c6d
Author: Jani Nikula <jani.nikula@intel.com>
Date:  Mon Feb 06 10:00:47 2017 +0000

drm: libdrm-2.4.75-7-gfe7cb34 from git://anongit.freedesktop.org/mesa/drm
mesa: mesa-13.0.3-bec04114 from git://anongit.freedesktop.org/mesa/mesa
cairo:1.15.4-68bbb693 from git://anongit.freedesktop.org/cairo
xserver: xorg-server-1.19.0-66-ga6fcb15 from git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel: 2.99.917-750-g2d6f2e8 from git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
libva:  libva-1.7.3.pre1-48-ge677ad9 from git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver: 1.7.3-287-g05d2d25 from git://git.freedesktop.org/git/vaapi/intel-driver
intel-gpu-tool:intel-gpu-tools-1.17-225-gcc8c960

Comment 7 Jani Saarinen 2017-03-08 08:03:11 UTC

Closing based on feedback from reporter and QA cannot see issue anymore.

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