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irq_work_run called from armv8pmu_handle_irq

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  irq_work_run called from armv8pmu_handle_irq Sodagudi Prasad <psodagud@codeaurora.org> - 2017-02-01 21:20 +0100
    Re: irq_work_run called from armv8pmu_handle_irq Will Deacon <will.deacon@arm.com> - 2017-02-02 13:50 +0100

#1571957 — irq_work_run called from armv8pmu_handle_irq

Hi All,

we would like to understand why irq_work_run() is getting called from 
armv8pmu_handle_irq() irq handler for arm SoC.

Is this irq_work frame work designed to run works from ARMPMU irq 
handlers?  If there are no of drivers using the IRQ WORK frame work,  we 
may see that ARMPMU irq handler taking long time, right?

-Thanks, Prasad

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#1572329

On Wed, Feb 01, 2017 at 12:15:01PM -0800, Sodagudi Prasad wrote:
> we would like to understand why irq_work_run() is getting called from
> armv8pmu_handle_irq() irq handler for arm SoC.
> 
> Is this irq_work frame work designed to run works from ARMPMU irq handlers?
> If there are no of drivers using the IRQ WORK frame work,  we may see that
> ARMPMU irq handler taking long time, right?

The perf_event_overflow callback can schedule IRQ work to e.g. disable the
PMU and want to make sure this runs before we EOI the PMU IRQ.

Will

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