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    Subject[PATCH v3 1/4] genirq: Introduce driver-readable IRQ status word
    Date
    From: Jan Kiszka <jan.kiszka@siemens.com>

    This associates a status word with every IRQ descriptor. Drivers can obtain
    its content via get_irq_status(irq). First use case will be propagating the
    interrupt sharing state.

    Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
    ---
    include/linux/interrupt.h | 2 ++
    include/linux/irq.h | 2 ++
    kernel/irq/manage.c | 15 +++++++++++++++
    3 files changed, 19 insertions(+), 0 deletions(-)

    diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
    index 79d0c4f..4c1aa72 100644
    --- a/include/linux/interrupt.h
    +++ b/include/linux/interrupt.h
    @@ -126,6 +126,8 @@ struct irqaction {

    extern irqreturn_t no_action(int cpl, void *dev_id);

    +extern unsigned long get_irq_status(unsigned int irq);
    +
    #ifdef CONFIG_GENERIC_HARDIRQS
    extern int __must_check
    request_threaded_irq(unsigned int irq, irq_handler_t handler,
    diff --git a/include/linux/irq.h b/include/linux/irq.h
    index abde252..8bdb421 100644
    --- a/include/linux/irq.h
    +++ b/include/linux/irq.h
    @@ -96,6 +96,7 @@ struct msi_desc;
    * methods, to allow shared chip implementations
    * @msi_desc: MSI descriptor
    * @affinity: IRQ affinity on SMP
    + * @drv_status: driver-readable status flags (IRQS_*)
    *
    * The fields here need to overlay the ones in irq_desc until we
    * cleaned up the direct references and switched everything over to
    @@ -111,6 +112,7 @@ struct irq_data {
    #ifdef CONFIG_SMP
    cpumask_var_t affinity;
    #endif
    + unsigned long drv_status;
    };

    /**
    diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
    index 5f92acc..2ea0d30 100644
    --- a/kernel/irq/manage.c
    +++ b/kernel/irq/manage.c
    @@ -1157,3 +1157,18 @@ int request_any_context_irq(unsigned int irq, irq_handler_t handler,
    return !ret ? IRQC_IS_HARDIRQ : ret;
    }
    EXPORT_SYMBOL_GPL(request_any_context_irq);
    +
    +/**
    + * get_irq_status - read interrupt line status word
    + * @irq: Interrupt line of the status word
    + *
    + * This returns the current content of the status word associated with
    + * the given interrupt line. See IRQS_* flags for details.
    + */
    +unsigned long get_irq_status(unsigned int irq)
    +{
    + struct irq_desc *desc = irq_to_desc(irq);
    +
    + return desc ? desc->irq_data.drv_status : 0;
    +}
    +EXPORT_SYMBOL_GPL(get_irq_status);
    --
    1.7.1


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