Eric Lee / smarc-fsl-linux-kernel

17 Oct, 2011

1 commit

  • 9bab0b7fb   genirq: Add IRQF_RESUME_EARLY and resume such IRQs earlier ... Browse Code »
    1

    This adds a mechanism to resume selected IRQs during syscore_resume
    instead of dpm_resume_noirq.

    Under Xen we need to resume IRQs associated with IPIs early enough
    that the resched IPI is unmasked and we can therefore schedule
    ourselves out of the stop_machine where the suspend/resume takes
    place.

    This issue was introduced by 676dc3cf5bc3 "xen: Use IRQF_FORCE_RESUME".

    Signed-off-by: Ian Campbell
    Cc: Rafael J. Wysocki
    Cc: Jeremy Fitzhardinge
    Cc: xen-devel
    Cc: Konrad Rzeszutek Wilk
    Link: http://lkml.kernel.org/r/1318713254.11016.52.camel@dagon.hellion.org.uk
    Cc: stable@kernel.org (at least to 2.6.32.y)
    Signed-off-by: Thomas Gleixner

    Ian Campbell
     

12 Mar, 2011

1 commit

  • d209a699a   genirq: Add chip flag to force mask on suspend ... Browse Code »

    On suspend we disable all interrupts in the core code, but this does
    not mask the interrupt line in the default implementation as we use a
    lazy disable approach. That means we mark the interrupt disabled, but
    leave the hardware unmasked. That's an optimization because we avoid
    the hardware access for the common case where no interrupt happens
    after we marked it disabled. If an interrupt happens, then the
    interrupt flow handler masks the line at the hardware level and marks
    it pending.

    Suspend makes use of this delayed disable as it "disables" all
    interrupts when preparing the suspend transition. Right before the
    system goes into hardware suspend state it checks whether one of the
    interrupts which is marked as a wakeup interrupt came in after
    disabling it.

    Most interrupt chips have a separate register which selects the
    interrupts which can wake up the system from suspend, so we don't have
    to mask any on the non wakeup interrupts.

    But now we have to deal with brilliant designed hardware which lacks
    such a wakeup configuration facility. For such hardware it's necessary
    to mask all non wakeup interrupts before going into suspend in order
    to avoid the wakeup from random interrupts.

    Rather than working around this in the affected interrupt chip
    implementations we can solve this elegant in the core code itself.

    Add a flag IRQCHIP_MASK_ON_SUSPEND which can be set by the irq chip
    implementation to indicate, that the interrupts which are not selected
    as wakeup sources must be masked in the suspend path. Mask them in the
    loop which checks the wakeup interrupts pending flag.

    Signed-off-by: Thomas Gleixner
    Reviewed-by: Abhijeet Dharmapurikar
    LKML-Reference:

    Thomas Gleixner
     

19 Feb, 2011

4 commits

08 Feb, 2011

1 commit

15 Dec, 2009

1 commit

05 Jul, 2009

1 commit

31 Mar, 2009

1 commit

  • 0a0c5168d   PM: Introduce functions for suspending and resuming device interrupts ... Browse Code »

    Introduce helper functions allowing us to prevent device drivers from
    getting any interrupts (without disabling interrupts on the CPU)
    during suspend (or hibernation) and to make them start to receive
    interrupts again during the subsequent resume. These functions make it
    possible to keep timer interrupts enabled while the "late" suspend and
    "early" resume callbacks provided by device drivers are being
    executed. In turn, this allows device drivers' "late" suspend and
    "early" resume callbacks to sleep, execute ACPI callbacks etc.

    The functions introduced here will be used to rework the handling of
    interrupts during suspend (hibernation) and resume. Namely,
    interrupts will only be disabled on the CPU right before suspending
    sysdevs, while device drivers will be prevented from receiving
    interrupts, with the help of the new helper function, before their
    "late" suspend callbacks run (and analogously during resume).

    Signed-off-by: Rafael J. Wysocki
    Acked-by: Ingo Molnar

    Rafael J. Wysocki