linux-kernel - Re: thunderbolt: Warning and 20 second delay in S4

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Date:   Mon, 12 Jul 2021 16:46:18 -0700
From:   Evan Green <evgreen@...omium.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        gil.fine@...el.com, Rajmohan Mani <rajmohan.mani@...el.com>,
        linux-usb@...r.kernel.org, Prashant Malani <pmalani@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: thunderbolt: Warning and 20 second delay in S4

On Fri, Jul 9, 2021 at 11:34 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Fri, Jul 09, 2021 at 02:31:35PM -0700, Evan Green wrote:
> > 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.
>
> 5.4 is pretty old, especially for thunderbolt issues, can you try 5.13
> please?

Good idea. On 5.13.0-next-20210709, I see the warning and delay even
at boot when runtime pm kicks in. This should make for an easier repro
at least:

[   18.832016] thunderbolt 0000:00:0d.2: 0: timeout reading config
space 2 from 0x6
[   18.840309] ------------[ cut here ]------------
[   18.845466] thunderbolt 0000:00:0d.2: interrupt for RX ring 0 is
already disabled
[   18.853836] WARNING: CPU: 0 PID: 5 at drivers/thunderbolt/nhi.c:103
ring_interrupt_active+0x1b7/0x1da
...
[   18.977736] CPU: 0 PID: 5 Comm: kworker/0:0 Tainted: G     U
    5.13.0-next-20210709 #18
[   18.996804] Workqueue: pm pm_runtime_work
[   19.001285] RIP: 0010:ring_interrupt_active+0x1b7/0x1da
...
[   19.100302] Call Trace:
[   19.103031]  tb_ring_stop+0x9d/0x17d
[   19.107022]  tb_ctl_stop+0x33/0xa0
[   19.110822]  tb_domain_runtime_suspend+0x35/0x3a
[   19.115979]  nhi_runtime_suspend+0x1f/0x4c
[   19.120557]  pci_pm_runtime_suspend+0x5a/0x173
[   19.125533]  ? pci_pm_restore_noirq+0x73/0x73
[   19.130411]  __rpm_callback+0x8a/0x10d
[   19.134595]  rpm_callback+0x22/0x74
[   19.138489]  ? pci_pm_restore_noirq+0x73/0x73
[   19.143355]  rpm_suspend+0x21e/0x514
[   19.147355]  pm_runtime_work+0x8a/0xa5
[   19.151554]  process_one_work+0x1b7/0x368
[   19.156027]  worker_thread+0x213/0x372
[   19.160217]  kthread+0x147/0x15f
[   19.163827]  ? pr_cont_work+0x58/0x58
[   19.167928]  ? kthread_blkcg+0x31/0x31
[   19.172113]  ret_from_fork+0x1f/0x30
[   19.176105] ---[ end trace 438b7f20f6b4049d ]---