| Summary: | [BYT Bisected]igt/pm_rpm/debugfs-forcewake-user causes system hang | ||||||
|---|---|---|---|---|---|---|---|
| Product: | DRI | Reporter: | Guo Jinxian <jinxianx.guo> | ||||
| Component: | DRM/Intel | Assignee: | Daniel Vetter <daniel> | ||||
| Status: | CLOSED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||
| Severity: | critical | ||||||
| Priority: | highest | CC: | intel-gfx-bugs, ming.yao | ||||
| Version: | unspecified | Keywords: | bisected | ||||
| Hardware: | Other | ||||||
| OS: | All | ||||||
| Whiteboard: | |||||||
| i915 platform: | i915 features: | ||||||
| Attachments: |
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Case igt/pm_rpm/drm-resources-equal is able to reproduce this issue on latest -nightly(f326cd0fae7e74011d3c0a8bd2be2cd2e2a45407) Created attachment 103375 [details]
dmesg
==Bisect results== ---------------------------- Bisect shows: 13cf550448b58abf8f44f5d6a560f2d20871c965 is the first bad commit commit 13cf550448b58abf8f44f5d6a560f2d20871c965 Author: Dave Airlie <airlied@redhat.com> AuthorDate: Wed Jun 18 11:29:35 2014 +1000 Commit: Daniel Vetter <daniel.vetter@ffwll.ch> CommitDate: Mon Jul 7 15:08:51 2014 +0200 drm/i915: rework digital port IRQ handling (v2) The digital ports from Ironlake and up have the ability to distinguish between long and short HPD pulses. Displayport 1.1 only uses the short form to request link retraining usually, so we haven't really needed support for it until now. However with DP 1.2 MST we need to handle the short irqs on their own outside the modesetting locking the long hpd's involve. This patch adds the framework to distinguish between short/long to the current code base, to lay the basis for future DP 1.2 MST work. This should mean we get better bisectability in case of regression due to the new irq handling. v2: add GM45 support (untested, due to lack of hw) commit f68d697eaf3278200a7fc3c8b1d95d72837b84d8 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Mon Aug 4 07:15:09 2014 +0100 drm/i915: only hook up hpd pulse for DP outputs (In reply to comment #4) > commit f68d697eaf3278200a7fc3c8b1d95d72837b84d8 > Author: Chris Wilson <chris@chris-wilson.co.uk> > Date: Mon Aug 4 07:15:09 2014 +0100 > > drm/i915: only hook up hpd pulse for DP outputs It also causes system hang. [root@x-byt01 ~]# cd /GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests [root@x-byt01 tests]# ./pm_rpm --run-subtest debugfs-forcewake-user IGT-Version: 1.7-g5c7bcb1 (x86_64) (Linux: 3.16.0-rc4_ym_f68d69_20140815+ x86_64) Runtime PM support: 1 PC8 residency support: 0 Verified on latest -nightly(186631131a9289dad22f51315d78b9b6ac5b425f) root@x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rpm --run-subtest debugfs-forcewake-user IGT-Version: 1.7-g5c7bcb1 (x86_64) (Linux: 3.16.0_drm-intel-nightly_186631_20140818+ x86_64) Runtime PM support: 1 PC8 residency support: 0 Subtest debugfs-forcewake-user: SUCCESS Closing verified+fixed. |
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==System Environment== -------------------------- Regression: Yes. Good commit on -next-queued: 57127efaf1adc5e0bb2d3fa5a01bd97f71af7836 Non-working platforms: BYT ==kernel== -------------------------- origin/drm-intel-nightly: 16025dad8e9964a5810385f755d43f1c48d6fdcc(fails) drm-intel-nightly: 2014y-07m-09d-14h-17m-14s integration manifest origin/drm-intel-next-queued: d101c8fe9bda6578ae72d6021415cfaad2b422f0(fails) drm/i915: remove i915_rstdby_delays debugfs entry origin/drm-intel-fixes: 01527b3127997ef6370d5ad4fa25d96847fbf12a(works) drm/i915/vlv: T12 eDP panel timing enforcement during reboot ==Bug detailed description== igt/pm_rpm/debugfs-forcewake-user causes system hang. We can not get dmesg because system hang. Output: root@x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rpm --run-subtest debugfs-forcewake-user IGT-Version: 1.7-g6b986a2 (x86_64) (Linux: 3.16.0-rc4_drm-intel-nightly_140ef1_20140711+ x86_64) Runtime PM support: 1 PC8 residency support: 0 ==Reproduce steps== ---------------------------- 1. ./pm_rpm --run-subtest debugfs-forcewake-user