[CI][KBL only] igt@* - dmesg-warn - *ERROR* CPU pipe [A|B] FIFO underrun

Submitted by Marta Löfstedt @marta

Assigned to Mun Gwan-gyeong @elongbug

Link to original bug (#105604)

Description

This bug is intended for KBL FIFO underruns.

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_4/fi-kbl-7500u/igt@kms_cursor_legacy@cursora-vs-flipa-toggle.html

[ 43.184721] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe A FIFO underrun
[ 43.185236] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe B FIFO underrun

Blocking

• Bug 105980

added CI feature: display/Other platform: KBL priority::high severity::normal + 1 deleted label

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_5/fi-kbl-7500u/igt@gem_mmap_gtt@basic-wc.html

[ 43.013962] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe A FIFO underrun

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_6/fi-kbl-7500u/igt@kms_cursor_legacy@cursorb-vs-flipb-toggle.html

[ 135.131495] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe B FIFO underrun

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_9/fi-kbl-7500u/igt@perf_pmu@semaphore-wait-bcs0.html


[ 190.129475] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe A FIFO underrun

Marta Löfstedt @marta said:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_12/fi-skl-6770hq/igt@gem_exec_schedule@reorder-wide-bsd2.html

Marta Löfstedt @marta said:

(In reply to Marta Löfstedt from comment 4)

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_12/fi-skl-6770hq/
igt@gem_exec_schedule@reorder-wide-bsd2.html

Wrong bug

Martin Peres @mupuf said:

Also seen on KBL-r:

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_30/fi-kbl-r/igt@kms_draw_crc@draw-method-rgb565-mmap-gtt-ytiled.html

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_30/fi-kbl-r/igt@kms_draw_crc@draw-method-rgb565-mmap-wc-ytiled.html

Francesco Balestrieri @baleboy said:

Still seen

Mun Gwan-gyeong @elongbug said:

After investigating the issue, I am suspecting a GEN9 hardware issue.
I figured out enabling FBC on a plane which has a combination of a 180-degree rotation with having a Height that isn't divisible by 4 occasionally causes FIFO underrun.
I tested the issue with igt-gpu-tools. ( multiplane-rotation-cropping-top subtest from kms_rotation_crc).
I tested on Gen9 disaply HWs (both Skylake and Kabylake).
when I added the patch code which make avoiding the issue case, I could always passed the test case.
https://gitlab.freedesktop.org/elongbug/drm-tip/tree/gen9_fbc_underrun01
elongbug/drm-tip@a3969a95

I asked a HW guy this issue to clarify.
And for now I am waiting the reply.

Mun Gwan-gyeong @elongbug said:

I received a guide of the issue from HW Team .
He guided me that we should disable FBC when 180 rotation and non-divisible by 4 plane size scenarios on GEN9

Issue case:
Enabling FBC on a plane which has a combination of a 180-degree rotation with having a Height that isn't divisible by 4 occasionally causes FIFO underrun.

Solution:
Disabling FBC on a plane which has a combination of a 180-degree rotation with having a Height that isn't divisible by 4 to GEN9

Mun Gwan-gyeong @elongbug said:

https://patchwork.freedesktop.org/patch/281708/

José Roberto de Souza @zehortigoza said:

Hi Gwan-gyeong

HW will add or already have added this information to BSpec?

Marijan said:

Running on Fedora 30, Kernel 5.2.9, HP Elitebook 840 G5, Using 2 external monitors on DP (tried also 1xVGA + 1DP, same issue).
Same issue on Ubuntu 18.04.

Result - PC Hangs, hw reboot required.

Here are the logs of last moments:

Jul 31 15:13:03 localhost.localdomain kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
Jul 31 15:13:03 localhost.localdomain kernel: [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]] *ERROR* mismatch in pixel_rate (expected 148500, found 296999)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]] *ERROR* mismatch in shared_dpll (expected 000000001275aaee, found 000000004520f932)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]] *ERROR* mismatch in dpll_hw_state.ctrl1 (expected 0x00000003, found 0x00000001)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]] *ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 148500, found 296999)
Jul 31 15:13:03 localhost.localdomain kernel: [drm:pipe_config_err [i915]] *ERROR* mismatch in port_clock (expected 270000, found 540000)
[drm:intel_ddi_prepare_link_retrain [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit
Jul 31 15:13:18 localhost.localdomain kernel: [drm:intel_ddi_prepare_link_retrain [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit
[drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:83:pipe C] flip_done timed out

Error appear/disappear more frequently after screen lock depending on kernel version.

Marijan said:

Related to previus post - driver configuration.

alpha_support N
disable_display N
disable_power_well 1
dmc_firmware_path (null)
edp_vswing 0
enable_dc -1
enable_dpcd_backlight N
enable_dp_mst Y
enable_fbc 1
enable_guc 2
enable_gvt N
enable_hangcheck Y
enable_ips 1
enable_psr 0
error_capture Y
fastboot -1
force_reset_modeset_test N
guc_firmware_path (null)
guc_log_level 1
huc_firmware_path (null)
invert_brightness 0
load_detect_test N
lvds_channel_mode 0
mmio_debug 1
modeset -1
nuclear_pageflip N
panel_use_ssc -1
prefault_disable N
reset 2
vbt_firmware (null)
vbt_sdvo_panel_type -1
verbose_state_checks Y

assigned to @elongbug

A CI Bug Log filter associated to this bug has been updated by Lakshmi Vudum:

Description: kbl: all tests - dmesg-warn - *ERROR* CPU pipe [A|B] FIFO underrun

Equivalent query: runconfig_tag IS IN ["DRM-TIP"] AND machine_name IS IN ["fi-kbl-7567u", "shard-kbl3", "shard-kbl2", "fi-kbl-7500u", "shard-kbl5", "shard-kbl6", "shard-kbl4", "shard-kbl", "shard-kbl1", "fi-kbl-7560u", "shard-kbl7", "fi-kbl-r"] AND ((testsuite_name = "IGT" AND status_name IS IN ["fail", "dmesg-warn"])) AND dmesg ~= '\*ERROR\* CPU pipe [ABC] FIFO underrun'

New failures caught by the filter:

• https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8184/shard-kbl2/igt@kms_mmap_write_crc@main.html

A CI Bug Log filter associated to this bug has been updated by Lakshmi Vudum:

Description: kbl: all tests - dmesg-warn/fail - *ERROR* CPU pipe [A|BC] FIFO underrun

Equivalent query: runconfig_tag IS IN ["DRM-TIP"] AND machine_name IS IN ["fi-kbl-7567u", "shard-kbl3", "shard-kbl2", "fi-kbl-7500u", "shard-kbl5", "shard-kbl6", "shard-kbl4", "shard-kbl", "shard-kbl1", "fi-kbl-7560u", "shard-kbl7", "fi-kbl-r"] AND ((testsuite_name = "IGT" AND status_name IS IN ["fail", "dmesg-warn"])) AND dmesg ~= '\*ERROR\* CPU pipe [ABC] FIFO underrun'

No new failures caught with the new filter

Issue is not reproducing on KBL. On KBL,Last seen on drmtip_629 (2 months, 2 weeks old). Hence closing the issue #93 (closed)

closed

The CI Bug Log issue associated to this bug has been archived.

New failures matching the above filters will not be associated to this bug anymore.