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SubjectRe: 3.12: ethernet controller missing after resuming from suspend to RAM
Date
On Sunday 09 February 2014 22:46:05 Rafael J. Wysocki wrote:
> That most likely would single out one of the ACPIPHP commits without giving
> us much clue about what's going on.
>
> I fail to see what the connection between those changes and system resume
> is, however.
>
> Please replace all pr_debug() calls in hotplug_notify() with pr_info() and
> see if you get any events from there.

I could not find a hotplug_notify function in the kernel tree, but I
have dyndbg enabled. Booting with `pci_hotplug.debug=Y
pci_hotplug.debug_acpi=Y pci_hotplug.dyndbg acpiphp.dyndbg` gives me
only a few acpiphp_glue messages. After resume:

[ 55.492261] CPU3 is up
[ 55.494710] ACPI: Waking up from system sleep state S3
[ 56.187298] ehci-pci 0000:00:1a.0: System wakeup disabled by ACPI
[ 56.213939] ehci-pci 0000:00:1d.0: System wakeup disabled by ACPI
[ 56.240614] xhci_hcd 0000:02:00.0: System wakeup disabled by ACPI
[ 56.294230] PM: noirq resume of devices complete after 133.375 msecs
[ 56.294507] PM: early resume of devices complete after 0.231 msecs
[ 56.294798] pcieport 0000:00:1c.1: System wakeup disabled by ACPI
[ 56.296628] iwlwifi 0000:05:00.0: RF_KILL bit toggled to enable radio.
[ 56.404258] snd_hda_intel 0000:00:1b.0: irq 48 for MSI/MSI-X
[ 56.627043] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 56.627929] ata1.00: configured for UDMA/133
[ 56.628044] sd 0:0:0:0: [sda] Starting disk
[ 56.633730] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 56.640403] ata5: SATA link down (SStatus 0 SControl 300)
[ 56.802771] ata2.00: configured for UDMA/100
[ 57.737542] PM: resume of devices complete after 1443.847 msecs
[ 57.737951] PM: Finishing wakeup.
[ 57.737957] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP03
[ 57.737960] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP03
[ 57.738080] iwlwifi 0000:05:00.0: no hotplug settings from platform
[ 57.737963] Restarting tasks ... done.
[ 57.740480] video LNXVIDEO:00: Restoring backlight state
[ 57.740487] video LNXVIDEO:01: Restoring backlight state
[ 58.203311] ACPI: \_SB_.AC__: ACPI_NOTIFY_BUS_CHECK event: unsupported
[ 58.204080] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP01
[ 58.204083] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP01
[ 58.204121] xhci_hcd 0000:02:00.0: no hotplug settings from platform
[ 58.204132] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP02
[ 58.204134] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP02
[ 58.209339] jme 0000:04:00.5: irq 50 for MSI/MSI-X
[ 58.233503] jme 0000:04:00.5 eth0: Link is down
[ 58.233578] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 58.235113] iwlwifi 0000:05:00.0: L1 Enabled; Disabling L0S
[ 58.242131] iwlwifi 0000:05:00.0: Radio type=0x1-0x3-0x1
[ 58.346311] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 58.392764] acpiphp_glue: hotplug_event: Bus check notify on \_SB_.PCI0.RP03
[ 58.392766] acpiphp_glue: hotplug_event: re-enumerating slots under \_SB_.PCI0.RP03
[ 58.392874] iwlwifi 0000:05:00.0: no hotplug settings from platform

RP02 is the ACPI Device for 00:1c.1 [1].

Could the following commit have something to do with it?

commit 4ebe34503baa0644c9352bcd76d4cf573bffe206
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Tue Jul 16 22:10:35 2013 +0200

ACPI / hotplug / PCI: Check for new devices on enabled slots

The current implementation of acpiphp_check_bridge() is pretty dumb:
- It enables a slot if it's not enabled and the slot status is
ACPI_STA_ALL.
- It disables a slot if it's enabled and the slot status is not
ACPI_STA_ALL.

This behavior is not sufficient to handle the Thunderbolt daisy
chaining case properly, however, because in that case the bus
behind the already enabled slot needs to be rescanned for new
devices.

For this reason, modify acpiphp_check_bridge() so that slots are
disabled and stopped if they are not in the ACPI_STA_ALL state.

For slots in the ACPI_STA_ALL state, devices behind them that don't
respond are trimmed using a new function, trim_stale_devices(),
introduced specifically for this purpose. That function walks
the given bus and checks each device on it. If the device doesn't
respond, it is assumed to be gone and is removed.

Once all of the stale devices directy behind the slot have been
removed, acpiphp_check_bridge() will start looking for new devices
that might have appeared on the given bus. It will do that even if
the slot is already enabled (SLOT_ENABLED is set for it).

In addition to that, make the bus check notification ignore
SLOT_ENABLED and go for enable_device() directly if bridge is NULL,
so that devices behind the slot are re-enumerated in that case too.

This change is based on earlier patches from Kirill A Shutemov
and Mika Westerberg.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Peter

[1]: https://github.com/Lekensteyn/acpi-stuff/blob/master/dsl/Clevo_B7130/DSDT.dsl#L8882



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