Bug 94869

Summary:	[BAT BSW] gem_ctx_param_basic/non-root-set-no-zeromap causes ERROR gpu hanging too fast
Product:	DRI	Reporter:	Tim Gore <tim.gore>
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:	normal
Priority:	highest	CC:	intel-gfx-bugs
Version:	DRI git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:	BSW/CHT	i915 features:	GPU hang

Description Tim Gore 2016-04-08 10:48:14 UTC

During BAT testing of a patch targeting gen9 only, several tests, of which gem_ctx_param_basic/non-root-set-no-zeromap is one, cause "*ERROR* gpu hanging too fast" in dmesg log on the bsw-nuc2 target, although the test reports success.
This has also been seen in CI_DRM_1199 and CI_DRM_1175. Maybe related to bug 89633.

Patch being tested is https://patchwork.freedesktop.org/series/5367/
This introduces a workaround in gen9_init_workarounds, which is also
conditional on
 (IS_SKL_REVID(dev, SKL_REVID_C0, REVID_FOREVER) || IS_BROXTON(dev))
So this patch should not be able to affect a BSW target.

Regression build. CI_DRM_1200

================================================================
Stdout	
IGT-Version: 1.14-gfd7fef6 (x86_64) (Linux: 4.6.0-rc2-gfxbench+ x86_64)
Subtest non-root-set-no-zeromap: SUCCESS (0.012s)
Stderr	
Environment	
PIGLIT_SOURCE_DIR="/opt/igt/piglit" PIGLIT_PLATFORM="mixed_glx_egl"
Command	/opt/igt/tests/gem_ctx_param_basic --run-subtest non-root-set-no-zeromap
dmesg	
[  577.819668] [drm:i915_set_reset_status [i915]] *ERROR* gpu hanging too fast, banning!
[  577.824606] drm/i915: Resetting chip after gpu hang
[  583.813212] [drm:i915_set_reset_status [i915]] *ERROR* gpu hanging too fast, banning!
[  583.817731] drm/i915: Resetting chip after gpu hang

Comment 1 Mika Kuoppala 2016-04-19 13:20:00 UTC

Should be fixed by,

commit a5e485a95c9c4cdd93b4c6dc53eee3bd1e50de11
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Wed Apr 13 21:19:51 2016 +0300

    drm/i915: Clear VLV_IER around irq processing

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