* Re: [Bug 213873] New: Hotplug ethernet cable to runtime suspended Realtek NIC doesn't raise PCIe PME IRQ on Intel ADL
[not found] <bug-213873-41252@https.bugzilla.kernel.org/>
@ 2021-07-27 15:55 ` Bjorn Helgaas
2021-07-29 14:50 ` Kai-Heng Feng
0 siblings, 1 reply; 2+ messages in thread
From: Bjorn Helgaas @ 2021-07-27 15:55 UTC (permalink / raw)
To: linux-pci; +Cc: Kai-Heng Feng, Rafael J. Wysocki, linux-pm
On Tue, Jul 27, 2021 at 06:10:13AM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=213873
>
> Bug ID: 213873
> Summary: Hotplug ethernet cable to runtime suspended Realtek
> NIC doesn't raise PCIe PME IRQ on Intel ADL
> Product: Drivers
> Version: 2.5
> Kernel Version: mainline
> Hardware: All
> OS: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: PCI
> Assignee: drivers_pci@kernel-bugs.osdl.org
> Reporter: kai.heng.feng@canonical.com
> Regression: No
>
> Both PCIe bridge and Realtek NIC are runtime suspended. When ethernet cable is
> plugged, PMEStatus and PMEPending are marked:
> RootSta: PME ReqID 0200, PMEStatus+ PMEPending+
>
> But the IRQ isn't raised:
> $ cat /proc/interrupts | grep PME
> 145: 0 0 0 0 0 0
> 0 0 0 0 0 0 VMD-MSI 126 PCIe
> PME, aerdrv, pcie-dpc
>
> So the hotplug event isn't detected.
>
> --
From the lspci after cable hotplug (comment #3):
0000:00:1c.0 PCI bridge ...
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
RootSta: PME ReqID 0200, PMEStatus+ PMEPending+
So it looks like the root port is not enabled to generate a PME
interrupt. pcie_pme_interrupt_enable() looks like it *could* enable
that. From a quick look, my guess is that pme.c doesn't claim this
root port because the platform says it doesn't support it:
acpi PNP0A08:00: _OSC: platform does not support [PCIeHotplug SHPCHotplug PME]
acpi PNP0A08:00: _OSC: OS now controls [AER PCIeCapability LTR]
Does booting with "pcie_ports=native" make it work? That's not a very
good solution, of course, because then both the firmware and Linux
think they own this functionality.
Is there a BIOS update that would fix this?
Bjorn
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Bug 213873] New: Hotplug ethernet cable to runtime suspended Realtek NIC doesn't raise PCIe PME IRQ on Intel ADL
2021-07-27 15:55 ` [Bug 213873] New: Hotplug ethernet cable to runtime suspended Realtek NIC doesn't raise PCIe PME IRQ on Intel ADL Bjorn Helgaas
@ 2021-07-29 14:50 ` Kai-Heng Feng
0 siblings, 0 replies; 2+ messages in thread
From: Kai-Heng Feng @ 2021-07-29 14:50 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: Linux PCI, Rafael J. Wysocki, Linux PM
On Tue, Jul 27, 2021 at 11:55 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> On Tue, Jul 27, 2021 at 06:10:13AM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=213873
> >
> > Bug ID: 213873
> > Summary: Hotplug ethernet cable to runtime suspended Realtek
> > NIC doesn't raise PCIe PME IRQ on Intel ADL
> > Product: Drivers
> > Version: 2.5
> > Kernel Version: mainline
> > Hardware: All
> > OS: Linux
> > Tree: Mainline
> > Status: NEW
> > Severity: normal
> > Priority: P1
> > Component: PCI
> > Assignee: drivers_pci@kernel-bugs.osdl.org
> > Reporter: kai.heng.feng@canonical.com
> > Regression: No
> >
> > Both PCIe bridge and Realtek NIC are runtime suspended. When ethernet cable is
> > plugged, PMEStatus and PMEPending are marked:
> > RootSta: PME ReqID 0200, PMEStatus+ PMEPending+
> >
> > But the IRQ isn't raised:
> > $ cat /proc/interrupts | grep PME
> > 145: 0 0 0 0 0 0
> > 0 0 0 0 0 0 VMD-MSI 126 PCIe
> > PME, aerdrv, pcie-dpc
> >
> > So the hotplug event isn't detected.
> >
> > --
>
> From the lspci after cable hotplug (comment #3):
>
> 0000:00:1c.0 PCI bridge ...
> RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
> RootSta: PME ReqID 0200, PMEStatus+ PMEPending+
>
> So it looks like the root port is not enabled to generate a PME
> interrupt. pcie_pme_interrupt_enable() looks like it *could* enable
> that. From a quick look, my guess is that pme.c doesn't claim this
> root port because the platform says it doesn't support it:
>
> acpi PNP0A08:00: _OSC: platform does not support [PCIeHotplug SHPCHotplug PME]
> acpi PNP0A08:00: _OSC: OS now controls [AER PCIeCapability LTR]
>
> Does booting with "pcie_ports=native" make it work? That's not a very
> good solution, of course, because then both the firmware and Linux
> think they own this functionality.
Yes, thanks for spotting this.
>
> Is there a BIOS update that would fix this?
This platform is still under enablement so we'll get a BIOS fix.
Kai-Heng
>
> Bjorn
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-213873-41252@https.bugzilla.kernel.org/>
2021-07-27 15:55 ` [Bug 213873] New: Hotplug ethernet cable to runtime suspended Realtek NIC doesn't raise PCIe PME IRQ on Intel ADL Bjorn Helgaas
2021-07-29 14:50 ` Kai-Heng Feng
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