[Bug 80517] New: [HSW Regression]igt/pm_rpm/system-suspend cause " WARNING: CPU: 0 PID: 786 at drivers/gpu/drm/i915/i915_irq.c:209 gen6_enable_rps_interrupts+0x39/0x5c [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80517

          Priority: high
            Bug ID: 80517
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression]igt/pm_rpm/system-suspend cause "
                    WARNING: CPU: 0 PID: 786 at
                    drivers/gpu/drm/i915/i915_irq.c:209
                    gen6_enable_rps_interrupts+0x39/0x5c [i915]()"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 101734
  --> https://bugs.freedesktop.org/attachment.cgi?id=101734&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: 868d665b43473e230d560d5186535270a3d57a19

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: 891f8a6bb39ec9a0434c4f8ba468d203e89bf7cd(fails)
    drm-intel-nightly: 2014y-06m-24d-16h-16m-36s integration manifest
origin/drm-intel-next-queued: 9c33baa6b3bbb01c1a88dceba986b20e6642cf31(fails)
    drivers/i915: Fix unnoticed failure of init_ring_common()
origin/drm-intel-fixes: 5b5ffff0d25060ab0e21fa0f6cd16428e87bf1ea(works)
    drm/i915: Hold the table lock whilst walking the file's idr and counting
the objects in debugfs

==Bug detailed description==
-----------------------------
igt/pm_rpm/system-suspend cause "WARNING: CPU: 0 PID: 786 at
drivers/gpu/drm/i915/i915_irq.c:209 gen6_enable_rps_interrupts+0x39/0x5c
[i915]()"

Dmesg shows:
[   64.318836] WARNING: CPU: 0 PID: 786 at drivers/gpu/drm/i915/i915_irq.c:209
gen6_enable_rps_interrupts+0x39/0x5c [i915]()
[   64.318844] Modules linked in: dm_mod snd_hda_codec_realtek iTCO_wdt
snd_hda_codec_generic iTCO_vendor_support snd_hda_codec_hdmi serio_raw pcspkr
i2c_i801 lpc_ich mfd_core snd_hda_intel snd_hda_controller snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore battery wmi tpm_infineon tpm_tis tpm
acpi_cpufreq i915 video button drm_kms_helper drm
[   64.318845] CPU: 0 PID: 786 Comm: kworker/0:1 Not tainted
3.15.0-rc8_kcloud_9c33ba_20140625+ #2
[   64.318846] Hardware name: ASUS All Series/Z87-EXPERT, BIOS 1008 05/17/2013
[   64.318851] Workqueue: events intel_gen6_powersave_work [i915]
[   64.318853]  0000000000000000 ffffffff8170a8d4 0000000000000000
ffffffff81033f78
[   64.318854]  ffffffffa0068408 ffff880251380000 ffff880251ac4000
0000000000040000
[   64.318854]  ffff880251388238 ffffffffa0068408 ffff880251380000
ffffffffa006e97c
[   64.318855] Call Trace:
[   64.318859]  [<ffffffff8170a8d4>] ? dump_stack+0x41/0x51
[   64.318861]  [<ffffffff81033f78>] ? warn_slowpath_common+0x6f/0x84
[   64.318867]  [<ffffffffa0068408>] ? gen6_enable_rps_interrupts+0x39/0x5c
[i915]
[   64.318872]  [<ffffffffa0068408>] ? gen6_enable_rps_interrupts+0x39/0x5c
[i915]
[   64.318877]  [<ffffffffa006e97c>] ? intel_gen6_powersave_work+0xe04/0xefe
[i915]
[   64.318880]  [<ffffffff81044d0c>] ? process_one_work+0x1c1/0x2ca
[   64.318881]  [<ffffffff8104584d>] ? worker_thread+0x1c9/0x2ad
[   64.318882]  [<ffffffff81045684>] ? rescuer_thread+0x267/0x267
[   64.318883]  [<ffffffff81049dc2>] ? kthread+0xca/0xd2
[   64.318884]  [<ffffffff81049cf8>] ? kthread_create_on_node+0x15d/0x15d
[   64.318887]  [<ffffffff81714dbc>] ? ret_from_fork+0x7c/0xb0
[   64.318888]  [<ffffffff81049cf8>] ? kthread_create_on_node+0x15d/0x15d


==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest system-suspend

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