[Bug 85890] [BDW]igt/tools_test + igt/drv_missed_irq_hang sporadically causes *ERROR* Unclaimed register detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85890

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #12 from lu hua <huax.lu at intel.com> ---
Test on the latest -nightly kernel.
clean boot system then run ./drv_missed_irq_hang, no error report.
clean boot system, run ./tools_test then run ./drv_missed_irq_hang, dmesg
report "WARNING: CPU: 2 PID: 4819 at drivers/gpu/drm/i915/intel_uncore.c:543
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()"

output:
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests#
./drv_missed_irq_hang
Interrupts masked
missed interrupts undetected
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./tools_test
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests#
./drv_missed_irq_hang
Interrupts masked
missed interrupts undetected
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
<4>[   44.049696] WARNING: CPU: 2 PID: 4819 at
drivers/gpu/drm/i915/intel_uncore.c:543
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
<4>[   44.049699] Modules linked in: ipv6 iTCO_wdt iTCO_vendor_support ppdev
dm_mod snd_hda_codec_hdmi pcspkr i2c_i801 snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep snd_pcm lpc_ich snd_timer mfd_core snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[   44.049715] CPU: 2 PID: 4819 Comm: gem_exec_blt Not tainted
3.19.0-rc5_drm-intel-nightly_98592c_20150122+ #762
<4>[   44.049912]  [<ffffffffa001070a>] ? drm_ioctl+0x279/0x3bc [drm]

dmesg:
[   44.049676] ------------[ cut here ]------------
[   44.049696] WARNING: CPU: 2 PID: 4819 at
drivers/gpu/drm/i915/intel_uncore.c:543
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]()
[   44.049698] Unclaimed register detected before writing to register 0x101008
[   44.049699] Modules linked in: ipv6 iTCO_wdt iTCO_vendor_support ppdev
dm_mod snd_hda_codec_hdmi pcspkr i2c_i801 snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep snd_pcm lpc_ich snd_timer mfd_core snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
[   44.049715] CPU: 2 PID: 4819 Comm: gem_exec_blt Not tainted
3.19.0-rc5_drm-intel-nightly_98592c_20150122+ #762
[   44.049717]  0000000000000000 0000000000000009 ffffffff817999a8
ffff880002f7f8c8
[   44.049720]  ffffffff8103bdcc 00000000000080d0 ffffffffa00c5679
0000000000000000
[   44.049722]  ffff880144660060 0000000000101008 0000000000101008
ffff880144660060
[   44.049724] Call Trace:
[   44.049730]  [<ffffffff817999a8>] ? dump_stack+0x40/0x50
[   44.049734]  [<ffffffff8103bdcc>] ? warn_slowpath_common+0x98/0xb0
[   44.049745]  [<ffffffffa00c5679>] ?
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]
[   44.049748]  [<ffffffff8103be7c>] ? warn_slowpath_fmt+0x45/0x4a
[   44.049759]  [<ffffffffa00c5679>] ?
hsw_unclaimed_reg_debug.isra.10+0x62/0x72 [i915]
[   44.049767]  [<ffffffffa00c6203>] ? gen8_write32+0x90/0x167 [i915]
[   44.049776]  [<ffffffffa009ff93>] ? gen8_ggtt_insert_entries+0xf7/0x116
[i915]
[   44.049785]  [<ffffffffa009f5f7>] ? ggtt_bind_vma+0x72/0xbe [i915]
[   44.049794]  [<ffffffffa00a240e>] ? i915_vma_bind+0x82/0x89 [i915]
[   44.049804]  [<ffffffffa00a7326>] ? i915_gem_object_pin_view+0x459/0x702
[i915]
[   44.049808]  [<ffffffff810e3c9d>] ? shmem_add_to_page_cache+0x8b/0xba
[   44.049818]  [<ffffffffa00b9d8b>] ? intel_lr_context_pin+0x8d/0xcb [i915]
[   44.049828]  [<ffffffffa00bae66>] ? intel_logical_ring_begin+0x12a/0x1ea
[i915]
[   44.049831]  [<ffffffff810e46da>] ? shmem_read_mapping_page_gfp+0x42/0x4c
[   44.049840]  [<ffffffffa00bb002>] ? gen8_emit_flush_render+0x3d/0xe1 [i915]
[   44.049849]  [<ffffffffa00ba8df>] ? logical_ring_flush_all_caches+0x1d/0x2a
[i915]
[   44.049857]  [<ffffffffa00bb86a>] ? gen8_init_rcs_context+0x156/0x16d [i915]
[   44.049866]  [<ffffffffa00bc012>] ?
intel_lr_context_deferred_create+0x6f0/0x799 [i915]
[   44.049875]  [<ffffffffa009daf5>] ?
i915_gem_do_execbuffer.isra.12+0x463/0xd88 [i915]
[   44.049885]  [<ffffffffa00a9c9c>] ? i915_gem_pwrite_ioctl+0x720/0x7a7 [i915]
[   44.049888]  [<ffffffff8110d890>] ? __kmalloc+0x66/0x151
[   44.049897]  [<ffffffffa009f36d>] ? i915_gem_execbuffer2+0x172/0x209 [i915]
[   44.049905]  [<ffffffffa009f1fb>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[   44.049912]  [<ffffffffa001070a>] ? drm_ioctl+0x279/0x3bc [drm]
[   44.049920]  [<ffffffffa009f1fb>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[   44.049923]  [<ffffffff81122335>] ? do_vfs_ioctl+0x412/0x459
[   44.049926]  [<ffffffff8104fdc9>] ? task_work_run+0x84/0x93
[   44.049929]  [<ffffffff811223c5>] ? SyS_ioctl+0x49/0x78
[   44.049932]  [<ffffffff8179f5ff>] ? int_signal+0x12/0x17
[   44.049935]  [<ffffffff8179f392>] ? system_call_fastpath+0x12/0x17
[   44.049936] ---[ end trace 969c110dafbfcbde ]---

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