Unclaimed read from register 0x1f0034

Unclaimed read from register 0x1f0034

[Chris Gorman]

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Hello all,

I'm not too sure where to report this but I got an unusual output in dmesg
a couple of days ago and wanted to pass it on.  Please let me know if I
need to submit a bug report too.

[ 4056.074906] Unclaimed read from register 0x1f0034
[ 4056.074990] ------------[ cut here ]------------
[ 4056.075021] WARNING: CPU: 0 PID: 5286 at
drivers/gpu/drm/i915/intel_uncore.c:792 __unclaimed_reg_debug+0x43/0x60
[ 4056.075030] Modules linked in:
[ 4056.075036] CPU: 0 PID: 5286 Comm: systemd-sleep Not tainted 4.13.0-rc1+
#2
[ 4056.075038] Hardware name: GOOGLE Banon, BIOS          07/01/2016
[ 4056.075040] task: ffff98dd76c1f2c0 task.stack: ffffb391007f4000
[ 4056.075044] RIP: 0010:__unclaimed_reg_debug+0x43/0x60
[ 4056.075046] RSP: 0018:ffffb391007f78e8 EFLAGS: 00010092
[ 4056.075049] RAX: 0000000000000025 RBX: 0000000000000000 RCX:
0000000000000002
[ 4056.075051] RDX: 0000000080000002 RSI: 0000000000000086 RDI:
0000000000000002
[ 4056.075052] RBP: ffffb391007f7900 R08: 0000000000000000 R09:
0000000000000025
[ 4056.075054] R10: 0000000000000018 R11: 0000000000000000 R12:
00000000001f0034
[ 4056.075056] R13: 0000000000000001 R14: ffff98dd76c90688 R15:
0000000000000000
[ 4056.075059] FS:  00007f16edaba740(0000) GS:ffff98ddbc800000(0000)
knlGS:0000000000000000
[ 4056.075061] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4056.075062] CR2: 00007ffc7e05b3f9 CR3: 00000000377b6000 CR4:
00000000001006f0
[ 4056.075066] Call Trace:
[ 4056.075074]  fwtable_read32+0x1dd/0x1f0
[ 4056.075083]  vlv_program_watermarks+0x3ea/0x670
[ 4056.075088]  vlv_optimize_watermarks+0xa4/0xc0
[ 4056.075093]  intel_atomic_commit_tail+0x33e/0xf90
[ 4056.075098]  intel_atomic_commit+0x3a0/0x490
[ 4056.075103]  ? intel_runtime_pm_put+0x56/0xa0
[ 4056.075108]  drm_atomic_commit+0x4b/0x50
[ 4056.075115]  drm_atomic_helper_commit_duplicated_state+0xc4/0xd0
[ 4056.075118]  __intel_display_resume+0x86/0xd0
[ 4056.075121]  intel_display_resume+0xc1/0xe0
[ 4056.075128]  i915_drm_resume+0xde/0x180
[ 4056.075131]  i915_pm_restore+0x1e/0x30
[ 4056.075134]  i915_pm_resume+0xe/0x10
[ 4056.075139]  pci_pm_resume+0x64/0xa0
[ 4056.075145]  dpm_run_callback+0x56/0x180
[ 4056.075148]  ? pci_pm_freeze+0xe0/0xe0
[ 4056.075151]  device_resume+0xe1/0x1f0
[ 4056.075154]  dpm_resume+0x10d/0x320
[ 4056.075157]  dpm_resume_end+0x11/0x20
[ 4056.075162]  suspend_devices_and_enter+0x13c/0x7b0
[ 4056.075166]  pm_suspend+0x31d/0x390
[ 4056.075169]  state_store+0x82/0xf0
[ 4056.075177]  kobj_attr_store+0xf/0x20
[ 4056.075183]  sysfs_kf_write+0x37/0x40
[ 4056.075186]  kernfs_fop_write+0x107/0x180
[ 4056.075193]  __vfs_write+0x28/0x130
[ 4056.075199]  ? __this_cpu_preempt_check+0x13/0x20
[ 4056.075204]  ? __sb_start_write+0xa0/0xe0
[ 4056.075207]  vfs_write+0xb8/0x1b0
[ 4056.075210]  SyS_write+0x46/0xa0
[ 4056.075217]  entry_SYSCALL_64_fastpath+0x1e/0xa9
[ 4056.075221] RIP: 0033:0x7f16ed1c0290
[ 4056.075223] RSP: 002b:00007fffe4f9c618 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 4056.075226] RAX: ffffffffffffffda RBX: 00007f16ed48db20 RCX:
00007f16ed1c0290
[ 4056.075228] RDX: 0000000000000004 RSI: 0000006d029693d0 RDI:
0000000000000004
[ 4056.075229] RBP: 0000000000001011 R08: 0000006d02969280 R09:
00007f16edaba740
[ 4056.075231] R10: 00007f16ed48db78 R11: 0000000000000246 R12:
00007f16ed48db78
[ 4056.075233] R13: 00007f16ed48db78 R14: 000000000000270f R15:
00007f16ed48db78
[ 4056.075236] Code: fe ff ff 38 d8 76 2d 45 84 ed 48 c7 c0 98 40 41 ac 48
c7 c6 a2 40 41 ac 48 0f 45 f0 44 89 e2 48 c7 c7 ab 40 41 ac e8 5e 51 a5 ff
<0f> ff 83 2d b0 8d 0f 01 01 5b 41 5c 41 5d 5d c3 0f 1f 00 66 2e
[ 4056.075296] ---[ end trace 1bdf66ea2a802075 ]---

I believe this is the result of a wake command and I don't believe that it
caused any loss in functionality.  Let me know if I should do some testing.

Thanks,
Chris

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Re: Unclaimed read from register 0x1f0034

[Jani Nikula]

On Sun, 23 Jul 2017, Chris Gorman <chrisjohgorman@gmail.com> wrote:
> I'm not too sure where to report this but I got an unusual output in dmesg
> a couple of days ago and wanted to pass it on.  Please let me know if I
> need to submit a bug report too.

If you can reproduce it, please file a bug over at [1], along with
dmesg. If you can run with drm.debug=14 module parameter, even better.

BR,
Jani.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel


-- 
Jani Nikula, Intel Open Source Technology Center
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Re: Unclaimed read from register 0x1f0034

[Chris Wilson]

Quoting Jani Nikula (2017-08-03 15:19:27)
> On Sun, 23 Jul 2017, Chris Gorman <chrisjohgorman@gmail.com> wrote:
> > I'm not too sure where to report this but I got an unusual output in dmesg
> > a couple of days ago and wanted to pass it on.  Please let me know if I
> > need to submit a bug report too.
> 
> If you can reproduce it, please file a bug over at [1], along with
> dmesg. If you can run with drm.debug=14 module parameter, even better.

It is known https://bugs.freedesktop.org/show_bug.cgi?id=101705
-Chris
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