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Subjectthunderbolt: Warning and 20 second delay in S4
Hi Mika et al,

I'm experimenting with suspending to disk (hibernate) on a Tigerlake
Chromebook running the chromeos-5.4 kernel. I don't have any USB4
peripherals plugged in. I'm getting this warning, along with a 20
second stall, both when going down for hibernate and coming back up.
The warning is here:

[ 603.415425] ------------[ cut here ]------------
[ 603.420600] thunderbolt 0000:00:0d.2: interrupt for TX ring 0 is
already disabled
[ 603.428984] WARNING: CPU: 2 PID: 14930 at
drivers/thunderbolt/nhi.c:104 ring_interrupt_active+0x1b7/0x1da
[ 603.439680] Modules linked in: rfcomm cmac algif_hash
algif_skcipher af_alg veth vhost_vsock vhost
vmw_vsock_virtio_transport_common vsock xt_cgroup uinput xt_MASQUERADE
snd_soc_sof_rt5682 snd_soc_hdac_hdmi btusb btrtl btintel uvcvideo
btbcm videobuf2_vmalloc videobuf2_v4l2 videobuf2_common
videobuf2_memops snd_hda_codec_hdmi bluetooth ecdh_generic
snd_soc_dmic ecc iio_trig_sysfs snd_sof_pci snd_sof_intel_hda_common
snd_sof_xtensa_dsp snd_sof_intel_hda soundwire_intel
soundwire_generic_allocation soundwire_cadence snd_soc_hdac_hda
snd_soc_acpi_intel_match snd_soc_acpi snd_sof snd_hda_ext_core
snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core
mei_hdcp intel_gna snd_soc_max98373_sdw regmap_sdw soundwire_bus
cros_ec_typec acpi_als industrialio_triggered_buffer kfifo_buf
snd_soc_rt5682_i2c snd_soc_max98373_i2c intel_pmc_mux snd_soc_max98373
industrialio snd_soc_rt5682 roles snd_soc_rl6231 typec ip6table_nat
fuse iwlmvm iwl7000_mac80211 iwlwifi lzo_rle zram cfg80211 cdc_ether
[ 603.439702] usbnet r8152 mii joydev
[ 603.541617] CPU: 2 PID: 14930 Comm: kworker/2:5 Tainted: G U W
5.4.128 #2
[ 603.559714] Workqueue: pm pm_runtime_work
[ 603.564202] RIP: 0010:ring_interrupt_active+0x1b7/0x1da
[ 603.570050] Code: 45 8b 47 24 48 c7 c6 26 fe 36 82 49 c7 c1 7a 5a
3b 82 45 84 f6 4c 0f 45 ce 48 c7 c7 02 36 3a 82 48 89 c6 31 c0 e8 2c
2e 81 ff <0f> 0b 49 8b 47 18 48 03 58 28 44 89 e7 48 89 de 48 83 c4 08
5b 41
[ 603.591036] RSP: 0018:ffffc9000405fc98 EFLAGS: 00010046
[ 603.596883] RAX: 62719e41749de400 RBX: 0000000000038200 RCX: 0000000000000007
[ 603.604851] RDX: 0000000000000001 RSI: 0000000000000082 RDI: ffff888277e96488
[ 603.612826] RBP: ffffc9000405fcc8 R08: 0000000000000001 R09: ffff888276c11800
[ 603.620808] R10: 00000000000008a1 R11: ffffffff814f5f05 R12: 0000000000000000
[ 603.628792] R13: ffffc90000438c40 R14: 0000000000000000 R15: ffff888274e28480
[ 603.636774] FS: 0000000000000000(0000) GS:ffff888277e80000(0000)
knlGS:0000000000000000
[ 603.645819] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 603.652241] CR2: 00007b08d5421060 CR3: 000000026033e003 CR4: 0000000000760ee0
[ 603.660213] PKRU: 55555554
[ 603.663233] Call Trace:
[ 603.665962] tb_ring_stop+0x9d/0x17d
[ 603.669959] tb_ctl_stop+0x3c/0x9d
[ 603.673772] tb_domain_runtime_suspend+0x35/0x3a
[ 603.678923] nhi_runtime_suspend+0x1f/0x4c
[ 603.683497] pci_pm_runtime_suspend+0x5c/0x173
[ 603.688471] ? pci_pm_restore_noirq+0x8d/0x8d
[ 603.693341] __rpm_callback+0x87/0x103
[ 603.697528] ? pci_pm_restore_noirq+0x8d/0x8d
[ 603.702408] rpm_callback+0x27/0x80
[ 603.706307] rpm_suspend+0x23d/0x55a
[ 603.710302] pm_runtime_work+0x78/0x90
[ 603.714488] process_one_work+0x1da/0x394
[ 603.718965] worker_thread+0x216/0x375
[ 603.723153] kthread+0x147/0x156
[ 603.726770] ? pr_cont_work+0x58/0x58
[ 603.730866] ? kthread_blkcg+0x2e/0x2e
[ 603.735052] ret_from_fork+0x1f/0x40
[ 603.739057] ---[ end trace 6494317f2b096251 ]---

The 20 second timeout comes with this print:
[ 189.490022] thunderbolt 0000:00:0d.2: 0: timeout reading config
space 2 from 0x6

I added my own warning so I could see the call stack when the 20
second timeout occurs. Here it is:

[ 189.159653] ------------[ cut here ]------------
[ 189.164833] WARNING: CPU: 2 PID: 7810 at
drivers/thunderbolt/ctl.c:988 tb_cfg_read+0xbc/0xee
[ 189.274592] CPU: 2 PID: 7810 Comm: kworker/u16:56 Tainted: G U
5.4.128 #6
[ 189.292887] Workqueue: events_unbound async_run_entry_fn
[ 189.298836] RIP: 0010:tb_cfg_read+0xbc/0xee
[ 189.303514] Code: 44 89 e6 e8 54 00 00 00 89 c3 65 48 8b 04 25 28
00 00 00 48 3b 45 d0 75 3e 89 d8 48 83 c4 20 5b 41 5c 41 5d 41 5e 41
5f 5d c3 <0f> 0b 49 8b 45 00 bf b8 00 00 00 48 03 78 18 48 c7 c6 b6 3e
3a 82
[ 189.324506] RSP: 0000:ffffc90003e07c08 EFLAGS: 00010246
[ 189.330358] RAX: ffffc90003e07c08 RBX: 00000000ffffff92 RCX: dbdecb3394931000
[ 189.338331] RDX: 0000000000015000 RSI: 0000000000000000 RDI: ffffc90003e079c0
[ 189.346309] RBP: ffffc90003e07c50 R08: ffff888277e9cb80 R09: 0000000000100000
[ 189.354284] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
[ 189.362265] R13: ffff888276383d00 R14: 0000000000000006 R15: 0000000000000000
[ 189.370240] FS: 0000000000000000(0000) GS:ffff888277e80000(0000)
knlGS:0000000000000000
[ 189.379282] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 189.385707] CR2: 0000000000000000 CR3: 000000026cd38001 CR4: 0000000000760ee0
[ 189.393680] PKRU: 55555554
[ 189.396700] Call Trace:
[ 189.399443] usb4_switch_wait_for_bit+0x91/0xf0
[ 189.404517] usb4_switch_set_sleep+0xfe/0x119
[ 189.409389] tb_suspend_noirq+0x7a/0x8b
[ 189.413686] tb_domain_suspend_noirq+0x38/0x60
[ 189.418669] __nhi_suspend_noirq+0x24/0x5a
[ 189.423234] nhi_poweroff_noirq+0x6f/0x8c
[ 189.427713] pci_pm_poweroff_noirq+0x76/0x10f
[ 189.432581] ? pci_pm_thaw_noirq+0x96/0x96
[ 189.437169] dpm_run_callback+0xa5/0x164
[ 189.441554] ? pci_pm_thaw_noirq+0x96/0x96
[ 189.446130] __device_suspend_noirq+0x112/0x20d
[ 189.451192] async_suspend_noirq+0x1f/0x93
[ 189.455778] async_run_entry_fn+0x3d/0xd1
[ 189.460258] process_one_work+0x1da/0x394
[ 189.464748] worker_thread+0x216/0x375
[ 189.468943] kthread+0x147/0x156
[ 189.472560] ? pr_cont_work+0x58/0x58
[ 189.476663] ? kthread_blkcg+0x2e/0x2e
[ 189.480860] ret_from_fork+0x1f/0x40
[ 189.484856] ---[ end trace 3e98173d9782f880 ]---

I'm unfamiliar with the thunderbolt driver, so any help or even hints
would be appreciated. I'm suspecting either some sort of imbalance in
suspend/resume calls, or maybe some difference in what PCI does
between suspend and freeze, but so far haven't found the smoking gun.
-Evan

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