[Bug 88913] New: [ILK bisected]igt/gem_workarounds/suspend-resume cause dmesg warn.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88913

            Bug ID: 88913
           Summary: [ILK bisected]igt/gem_workarounds/suspend-resume cause
                    dmesg warn.
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113039
  --> https://bugs.freedesktop.org/attachment.cgi?id=113039&action=edit
dmesg for case igt/gem_workarounds/suspend-resume

==System Environment==
--------------------------
Regression: yes
Non-working platforms:  ILK==kernel==
--------------------------
drm-intel-nightly/8b4216f91c7bf8d3459cadf9480116220bd6545e(2015-02-02)


==Bug detailed description==
-----------------------------
igt/gem_workarounds/suspend-resume case success, but there is dmesg warn after
run this case:
dmesg -r|egrep "<[1-4]>"|grep drm
<4>[    1.427143] WARNING: CPU: 0 PID: 1219 at
drivers/gpu/drm/i915/intel_uncore.c:169
intel_uncore_forcewake_reset+0x18b/0x27e [i915]()
<4>[    1.427150] Modules linked in: i915(+) button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
<4>[    1.427152] CPU: 0 PID: 1219 Comm: udevd Not tainted
3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<4>[    1.427315]  [<ffffffffa00135ac>] ? drm_dev_register+0x74/0xe6 [drm]
<4>[    1.427320]  [<ffffffffa0015952>] ? drm_get_pci_dev+0xf7/0x1b2 [drm]
<4>[  279.286823] WARNING: CPU: 1 PID: 4052 at
drivers/gpu/drm/i915/intel_uncore.c:169
intel_uncore_forcewake_reset+0x18b/0x27e [i915]()
<4>[  279.286839] Modules linked in: ip6table_filter ip6_tables ebtable_nat
ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables
bridge stp llc ipv6 dm_mod iTCO_wdt iTCO_vendor_support snd_hda_codec_hdmi
ppdev snd_hda_codec_realtek snd_hda_codec_generic dcdbas serio_raw pcspkr
i2c_i801 snd_hda_intel lpc_ich snd_hda_controller mfd_core snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore wmi parport_pc parport tpm_tis tpm
acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
<4>[  279.286841] CPU: 1 PID: 4052 Comm: kworker/u16:13 Tainted: G        W    
 3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<4>[  279.286886]  [<ffffffffa00858dd>] ? i915_drm_suspend+0x17d/0x1b3 [i915]
<4>[  279.695643] WARNING: CPU: 3 PID: 967 at
drivers/gpu/drm/i915/intel_uncore.c:169
intel_uncore_forcewake_reset+0x18b/0x27e [i915]()
<4>[  279.695664] Modules linked in: ip6table_filter ip6_tables ebtable_nat
ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables
bridge stp llc ipv6 dm_mod iTCO_wdt iTCO_vendor_support snd_hda_codec_hdmi
ppdev snd_hda_codec_realtek snd_hda_codec_generic dcdbas serio_raw pcspkr
i2c_i801 snd_hda_intel lpc_ich snd_hda_controller mfd_core snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore wmi parport_pc parport tpm_tis tpm
acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
<4>[  279.695667] CPU: 3 PID: 967 Comm: kworker/u16:3 Tainted: G        W     
3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<4>[  279.695708]  [<ffffffffa00863a3>] ? i915_drm_resume_early+0x94/0x94
[i915]
<4>[  279.695721]  [<ffffffffa008636c>] ? i915_drm_resume_early+0x5d/0x94
[i915]

==Reproduce steps==
---------------------------- 

./gem_workarounds --run-subtest suspend-resume

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