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    SubjectRe: 2.6.30 enabling cpu1 on resume fails after suspend to memory
    On Sun, 14 Jun 2009 14:15:16 +0200
    "Rafael J. Wysocki" <rjw@sisk.pl> wrote:

    > On Sunday 14 June 2009, Thomas Gleixner wrote:
    > > On Sun, 14 Jun 2009, Rafael J. Wysocki wrote:
    > > > Evidently, the change of the interrupt handling during suspend-resume,
    > > > commit 2ed8d2b3a81bdbb0418301628ccdb008ac9f40b7 (PM: Rework handling of
    > > > interrupts during suspend-resume) broke resume (specifically, the enabling of
    > > > nonboot CPUs) on the Benjamin's machine, but only if MSI support is enabled.
    > > > Also, resume works if suspend_device_irqs() and resume_device_irqs() in
    > > > drivers/base/power/main.c are commented out.
    > > >
    > > > Is there anything the MSI code does in __enable_irq() and/or __disable_irq()
    > > > that might cause this problem to appear?
    > >
    > > Not that I'm aware of. Which of the devices is using MSI ? Have to
    > > tried to skip only the MSI ones in suspend/resume_device_irqs() ?
    >
    > Good idea.
    >
    > Benjamin, please send /proc/interrupts from your system.

    I guess it does not matter if from 2.6.29.2 or from 2.6.30. This
    is from 2.6.29.2 with CONFIG_PCI_MSI set:

    CPU0 CPU1
    0: 42 1 IO-APIC-edge timer
    1: 0 81 IO-APIC-edge i8042
    6: 0 5 IO-APIC-edge floppy
    8: 0 1 IO-APIC-edge rtc0
    9: 0 0 IO-APIC-fasteoi acpi
    14: 0 328 IO-APIC-edge ide0
    15: 0 0 IO-APIC-edge ide1
    16: 2 408 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb3, HDA Intel
    17: 0 3 IO-APIC-fasteoi ehci_hcd:usb2
    18: 0 0 IO-APIC-fasteoi ohci_hcd:usb5, ohci_hcd:usb6, ohci_hcd:usb7
    19: 0 17 IO-APIC-fasteoi ehci_hcd:usb4, HDA Intel
    24: 4830 0 HPET_MSI-edge hpet2
    26: 0 135 PCI-MSI-edge eth0
    27: 0 2855 PCI-MSI-edge ahci
    NMI: 0 0 Non-maskable interrupts
    LOC: 42 5070 Local timer interrupts
    RES: 2634 2170 Rescheduling interrupts
    CAL: 72 104 Function call interrupts
    TLB: 367 198 TLB shootdowns
    TRM: 0 0 Thermal event interrupts
    THR: 0 0 Threshold APIC interrupts
    SPU: 0 0 Spurious interrupts
    ERR: 0
    MIS: 0

    I am going to compile 2.6.30 with CONFIG_PCI_MSI again to ensure
    it is the same, but that will take some time.


    Benjamin


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