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SubjectRe: Issue with commit de3ef1eb1cd - PM / core: Drop run_wake flag from struct dev_pm_info [Was: MEI-related WARN_ON() triggered during resume-from-sleep on v4.13-rc2+]
On Tue, Aug 1, 2017 at 1:55 AM, Rafael J. Wysocki <rafael@kernel.org> wrote:
> Hi,
>
> On Tue, Aug 1, 2017 at 12:16 AM, Dominik Brodowski
> <linux@dominikbrodowski.net> wrote:
>> Rafael, Mika, Bjorn and Tomas,
>>
>> can't explain exactly what causes breakage between MEI and PM first seen on
>> v4.13-rc2 (ther was a typo in the orignal message), but I was able to bisect
>> it down to commit
>>
>> [de3ef1eb1cd0cc3a75f7a3661e10ed827f370ab8] PM / core: Drop run_wake flag from struct dev_pm_info
>>
>
> [cut]
>
>>>
>>> > [ 192.940537] Restarting tasks ...
>>> > [ 192.940610] PGI is not set
>>> > [ 192.940619] ------------[ cut here ]------------ [ 192.940623] WARNING: CPU: 0
>>> > PID: 1661 at /home/brodo/local/kernel/git/linux/drivers/misc/mei/hw-
>>> > me.c:653 mei_me_pg_exit_sync+0x351/0x360 [ 192.940624] Modules linked
>>> > in:
>>> > [ 192.940627] CPU: 0 PID: 1661 Comm: kworker/0:3 Not tainted 4.13.0-rc2+
>>> > #2 [ 192.940628] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A11
>>> > 12/08/2016 [ 192.940630] Workqueue: pm pm_runtime_work <snip> [
>>> > 192.940642] Call Trace:
>>> > [ 192.940646] ? pci_pme_active+0x1de/0x1f0 [ 192.940649] ?
>>> > pci_restore_standard_config+0x50/0x50
>>> > [ 192.940651] ? kfree+0x172/0x190
>>> > [ 192.940653] ? kfree+0x172/0x190
>>> > [ 192.940655] ? pci_restore_standard_config+0x50/0x50
>>> > [ 192.940663] mei_me_pm_runtime_resume+0x3f/0xc0
>>> > [ 192.940665] pci_pm_runtime_resume+0x7a/0xa0 [ 192.940667]
>>> > __rpm_callback+0xb9/0x1e0 [ 192.940668] ?
>>> > preempt_count_add+0x6d/0xc0 [ 192.940670] rpm_callback+0x24/0x90 [
>>> > 192.940672] ? pci_restore_standard_config+0x50/0x50
>>> > [ 192.940674] rpm_resume+0x4e8/0x800
>>> > [ 192.940676] pm_runtime_work+0x55/0xb0 [ 192.940678]
>>> > process_one_work+0x184/0x3e0 [ 192.940680] worker_thread+0x4d/0x3a0 [
>>> > 192.940681] ? preempt_count_sub+0x9b/0x100 [ 192.940683]
>>> > kthread+0x122/0x140 [ 192.940684] ? process_one_work+0x3e0/0x3e0 [
>>> > 192.940685] ? __kthread_create_on_node+0x1a0/0x1a0
>>> > [ 192.940688] ret_from_fork+0x27/0x40
>>> > [ 192.940690] Code: 96 3a 9e ff 48 8b 7d 98 e8 cd 21 58 00 83 bb bc 01 00 00
>>> > 04 0f 85 40 fe ff ff e9 41 fe ff ff 48 c7 c7 5f 04 99 96 e8 93 6b 9f ff <0f> ff e9 5d
>>> > fd ff ff e8 33 fe 99 ff 0f 1f 00 0f 1f 44 00 00 55 [ 192.940719] ---[ end trace
>>> > a86955597774ead8 ]--- [ 192.942540] done.
>>> >
>>> > This doesn't / didn't happen on v4.12.
>>
>>
>> By using the dynamic_debug infrastructure, I was able to obtain a few more
>> data points:
>>
>> Running 0847684cfc5f, when suspending the system to ram and resuming again,
>> I see the following messages:
>
> You have removed some relevant parts of the log, but I think I see
> what's going on.
>
>> [ 614.936773] sd 3:0:0:0: [sda] Stopping disk
>> [ 614.956004] mei_me 0000:00:16.0: rpm: me: runtime resume
>
> This is a runtime resume during system suspend.
>
>> [ 614.956165] ACPI : EC: event blocked
>> [ 614.980164] mei_me 0000:00:16.0: interrupt source 0x00000002
>> [ 614.980191] mei_me 0000:00:16.0: function called after ISR to handle the interrupt processing.
>> ...
>> [ 615.266896] Suspended for 1.190 seconds
>> ...
>> [ 615.455775] sd 3:0:0:0: [sda] Starting disk
>> [ 615.455855] mei_me 0000:00:16.0: interrupt source 0x00000002
>> [ 615.455870] mei_me 0000:00:16.0: function called after ISR to handle the interrupt processing.
>> [ 615.455877] mei_me 0000:00:16.0: we need to start the dev.
>>
>> and everything works fine as expected (no WARN(), no stack trace, nothing
>> dubious).
>>
>> Running de3ef1eb1cd0 instead, when suspending, I see *no* mei_me-related
>> message. During resume, the stack trace already noted above for
>> v4.13-rc2+ appears again:
>>
>> [ 80.333909] sd 3:0:0:0: [sda] Stopping disk
>> [ 80.535777] psmouse serio1: Failed to disable mouse on isa0060/serio1
>> [ 80.983510] ACPI : EC: event blocked
>
> Which apparently doesn't happen here.
>
>> [ 81.065510] PM: suspend of devices complete after 734.074 msecs
>> ...
>> [ 82.137038] Restarting tasks ...
>> [ 82.143986] mei_me 0000:00:16.0: rpm: me: runtime resume
>
> And which does happen here, after system resume, but then it confuses
> the driver.
>
>> [ 82.143989] PGI is not set
>> [ 82.144001] ------------[ cut here ]------------
>> [ 82.144008] WARNING: CPU: 3 PID: 1881 at /home/brodo/local/kernel/git/linux/drivers/misc/mei/hw-me.c:653 mei_me_pg_exit_sync+0x351/0x360
>> [ 82.144009] Modules linked in:
>> [ 82.144012] CPU: 3 PID: 1881 Comm: kworker/3:5 Not tainted 4.12.0-rc5+ #3
>> [ 82.144013] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A11 12/08/2016
>> ...
>> [ 82.144017] Workqueue: pm pm_runtime_work
>> [ 82.144019] task: ffff964a91b35700 task.stack: ffffa51b43508000
>> [ 82.144022] RIP: 0010:mei_me_pg_exit_sync+0x351/0x360
>> ...
>> [ 82.144156] ---[ end trace 5827b2fcedec4bc9 ]---
>> [ 82.144272] done.
>> ...
>> [ 83.194425] mei_me 0000:00:16.0: rpm: me: runtime resume ret = -62
>> [ 83.194460] mei_me 0000:00:16.0: unexpected reset: dev_state = ENABLED fw status = 1E000245 6000A106 00000200 00004400 00000101 43C00ED9
>> ...
>>
>> Any ideas?
>
> Can you check if the attached patch makes any difference?

Actually, I don't think it will make any difference. Please check the
one attached this time.

Thanks,
Rafael
---
drivers/misc/mei/pci-me.c | 2 ++
1 file changed, 2 insertions(+)

Index: linux-pm/drivers/misc/mei/pci-me.c
===================================================================
--- linux-pm.orig/drivers/misc/mei/pci-me.c
+++ linux-pm/drivers/misc/mei/pci-me.c
@@ -223,6 +223,8 @@ static int mei_me_probe(struct pci_dev *
if (!pci_dev_run_wake(pdev))
mei_me_set_pm_domain(dev);

+ pdev->dev_flags |= PCI_DEV_FLAGS_NEEDS_RESUME;
+
if (mei_pg_is_enabled(dev))
pm_runtime_put_noidle(&pdev->dev);
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