[BUG] on reboot: bisected to: drm/i915: Shut down displays gracefully on reboot

[Jani Nikula]

On Thu, 14 Jan 2021, Steven Rostedt <rostedt at goodmis.org> wrote:
> [ Forgot to add those on the commit itself ]
>
> -- Steve
>
>
> On Thu, 14 Jan 2021 16:32:06 -0500
> Steven Rostedt <rostedt at goodmis.org> wrote:
>
>> On reboot, one of my test boxes now triggers the following warning:
>> 
>>  ------------[ cut here ]------------
>>  RPM raw-wakeref not held
>>  WARNING: CPU: 4 PID: 1 at drivers/gpu/drm/i915/intel_runtime_pm.h:106 gen6_write32+0x1bc/0x2a0 [i915]
>>  Modules linked in: ebtable_filter ebtables bridge stp llc ip6t_REJECT nf_reject_ipv6 vsock vmw_vmci xt_state xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6table_filter ip6_tables snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic le
>> 15 snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep i2c_algo_bit snd_hda_core snd_seq intel_rapl_msr snd_seq_device intel_rapl_common snd_pcm x86_pkg_temp_thermal intel_powerclamp snd_timer snd coretemp kvm_intel soundcore kvm mei_wdt irqbypass joydev 
>> _pmc_bxt hp_wmi wmi_bmof sparse_keymap rfkill iTCO_vendor_support crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel drm_kms_helper i2c_i801 cec drm rapl intel_cstate intel_uncore mei_me i2c_smbus e1000e tpm_infineon wmi serio_raw mei video lpc_i
>> 
>>  CPU: 4 PID: 1 Comm: systemd-shutdow Not tainted 5.9.0-rc4-test+ #861
>>  Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016
>>  RIP: 0010:gen6_write32+0x1bc/0x2a0 [i915]
>>  Code: 5d 82 e0 0f 0b e9 b5 fe ff ff 80 3d 95 6b 22 00 00 0f 85 b2 fe ff ff 48 c7 c7 04 d2 a4 c0 c6 05 81 6b 22 00 01 e8 f6 5c 82 e0 <0f> 0b e9 98 fe ff ff 80 3d 6d 6b 22 00 00 0f 85 95 fe ff ff 48 c7
>>  RSP: 0018:ffffb9c1c002fd08 EFLAGS: 00010296
>>  RAX: 0000000000000018 RBX: ffff99aec8881010 RCX: ffff99aeda400000
>>  RDX: 0000000000000000 RSI: ffffffffa115d9ef RDI: ffffffffa115d9ef
>>  RBP: 0000000000044004 R08: 0000000000000001 R09: 0000000000000000
>>  R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
>>  R13: 0000000000000001 R14: 00000000ffffffff R15: 0000000000000000
>>  FS:  00007f91257a9940(0000) GS:ffff99aeda400000(0000) knlGS:0000000000000000
>>  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>  CR2: 00007f9126829400 CR3: 00000001088f0006 CR4: 00000000001706e0
>>  Call Trace:
>>   gen3_irq_reset+0x2e/0xd0 [i915]
>>   intel_irq_reset+0x59/0x6a0 [i915]
>>   intel_runtime_pm_disable_interrupts+0xe/0x30 [i915]
>>   i915_driver_shutdown+0x2e/0x40 [i915]
>>   pci_device_shutdown+0x34/0x60
>>   device_shutdown+0x15d/0x1b3
>>   kernel_restart+0xe/0x30
>>   __do_sys_reboot+0x1d7/0x210
>>   ? vfs_writev+0x9d/0xe0
>>   ? syscall_enter_from_user_mode+0x1d/0x70
>>   ? trace_hardirqs_on+0x2c/0xe0
>>   do_syscall_64+0x33/0x40
>>   entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>  RIP: 0033:0x7f912675f2d7
>>  Code: 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 89 fa be 69 19 12 28 bf ad de e1 fe b8 a9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 81 8b 0c 00 f7 d8 64 89 02 b8
>>  RSP: 002b:00007ffeca28e148 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9
>>  RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f912675f2d7
>>  RDX: 0000000001234567 RSI: 0000000028121969 RDI: 00000000fee1dead
>>  RBP: 00007ffeca28e3d0 R08: 000000000000000a R09: 0000000000000000
>>  R10: 0000000000000232 R11: 0000000000000206 R12: 0000000000000001
>>  R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffeca28e4b8
>>  ---[ end trace 2ed17eabd3ab6938 ]---
>>  ------------[ cut here ]------------
>> 
>> The bisect came to this commit:
>> 
>>   fe0f1e3bfdfeb53e18f1206aea4f40b9bd1f291c
>>   ("drm/i915: Shut down displays gracefully on reboot")
>> 
>> Which makes sense, as it happens on shutdown.

Please try this pull, heading to -rc4, which cointains "drm/i915:
Disable RPM wakeref assertions during driver shutdown":

http://lore.kernel.org/r/87sg73pz42.fsf@intel.com


BR,
Jani.

>> 
>> -- Steve
>

-- 
Jani Nikula, Intel Open Source Graphics Center