[Bug 89626] [all]igt/drv_suspend/forcewake causes WARNING: CPU: 5 PID: 4366 at drivers/gpu/drm/i915/intel_uncore.c:463 assert_forcewakes_inactive+0x57/0x6d [i915]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89626

--- Comment #2 from ye.tian <yex.tian at intel.com> ---
Test it on SNB with the latest nightly kernel and latest igt, it still exists.

output:
--------------
root at x-sgb3:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./drv_suspend
--run-subtest forcewake
IGT-Version: 1.10-ge1ce5ea (x86_64) (Linux:
4.0.0_drm-intel-nightly_92bb36_20150424+ x86_64)
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Fri Apr 24 02:46:52 2015
Subtest forcewake: SUCCESS (0.382s)

dmesg info
------------------
[  176.558418] ------------[ cut here ]------------
[  176.558438] WARNING: CPU: 1 PID: 4707 at
drivers/gpu/drm/i915/intel_uncore.c:517 assert_forcewakes_inactive+0x5a/0x70
[i915]()
[  176.558439] WARN_ON(domain->wake_count)
[  176.558450] Modules linked in: ipv6 dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support ppdev snd_hda_codec_realtek snd_hda_codec_generic pcspkr
serio_raw i2c_i801 firewire_ohci lpc_ich mfd_core firewire_core crc_itu_t
snd_hda_intel snd_hda_controller joydev snd_hda_codec snd_hda_core snd_hwdep
snd_pcm snd_timer snd soundcore parport_pc parport tpm_tis tpm acpi_cpufreq
i915 button video drm_kms_helper drm
[  176.558453] CPU: 1 PID: 4707 Comm: kworker/u8:21 Not tainted
4.0.0_drm-intel-nightly_92bb36_20150424+ #38
[  176.558454] Hardware name:                  /DQ67SW, BIOS
SWQ6710H.86A.0060.2011.1220.1805 12/20/2011
[  176.558458] Workqueue: events_unbound async_run_entry_fn
[  176.558460]  0000000000000000 0000000000000009 ffffffff81795847
ffff880234683c18
[  176.558461]  ffffffff8103bd5a 0000000000000000 ffffffffa00c07cc
0000000000000000
[  176.558462]  ffff880002990000 0000000000000000 ffff880002990140
0000000000000001
[  176.558463] Call Trace:
[  176.558468]  [<ffffffff81795847>] ? dump_stack+0x40/0x50
[  176.558471]  [<ffffffff8103bd5a>] ? warn_slowpath_common+0x98/0xb0
[  176.558481]  [<ffffffffa00c07cc>] ? assert_forcewakes_inactive+0x5a/0x70
[i915]
[  176.558483]  [<ffffffff8103bdb7>] ? warn_slowpath_fmt+0x45/0x4a
[  176.558493]  [<ffffffffa00c07cc>] ? assert_forcewakes_inactive+0x5a/0x70
[i915]
[  176.558503]  [<ffffffffa00c0a40>] ? intel_uncore_forcewake_reset+0x25e/0x260
[i915]
[  176.558511]  [<ffffffffa007b89c>] ? i915_drm_suspend+0x16c/0x1a1 [i915]
[  176.558514]  [<ffffffff8135fa1e>] ? pci_pm_suspend+0x79/0xf6
[  176.558516]  [<ffffffff8135f9a5>] ? pci_pm_freeze+0xa4/0xa4
[  176.558518]  [<ffffffff813f21a9>] ? dpm_run_callback+0x3a/0xc5
[  176.558520]  [<ffffffff813f2b17>] ? __device_suspend+0x1d1/0x25d
[  176.558521]  [<ffffffff813f2bb9>] ? async_suspend+0x16/0x7d
[  176.558523]  [<ffffffff81052783>] ? async_run_entry_fn+0x2d/0xbf
[  176.558526]  [<ffffffff8104ca7f>] ? process_one_work+0x1b2/0x31d
[  176.558528]  [<ffffffff8104d278>] ? worker_thread+0x24d/0x339
[  176.558530]  [<ffffffff8104d02b>] ? cancel_delayed_work_sync+0xa/0xa
[  176.558532]  [<ffffffff81050b25>] ? kthread+0xce/0xd6
[  176.558533]  [<ffffffff81050a57>] ? kthread_create_on_node+0x162/0x162
[  176.558535]  [<ffffffff8179b048>] ? ret_from_fork+0x58/0x90
[  176.558536]  [<ffffffff81050a57>] ? kthread_create_on_node+0x162/0x162
[  176.558537] ---[ end trace 1b63e650bbd677f1 ]---

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