diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-02-10 15:14:20 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-19 12:58:24 +0100 |
| commit | 781295762defc709a609efc01d8bb065276cd9a2 (patch) | |
| tree | 21f035b5f92571c8c3559b5e94eb0e1aa4113a36 | |
| parent | 3836ca08aad4575c120ccf328652f3873eea9063 (diff) | |
genirq: Add preflow handler support
sparc64 needs to call a preflow handler on certain interrupts befor
calling the action chain. Integrate it into handle_fasteoi_irq. Must
be enabled via CONFIG_IRQ_FASTEOI_PREFLOW. No impact when disabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/irq.h | 3 | ||||
| -rw-r--r-- | include/linux/irqdesc.h | 14 | ||||
| -rw-r--r-- | kernel/irq/Kconfig | 3 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 11 |
4 files changed, 30 insertions, 1 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 3e29e2f42e0..36390970693 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -29,9 +29,10 @@ #include <asm/irq_regs.h> struct irq_desc; +struct irq_data; typedef void (*irq_flow_handler_t)(unsigned int irq, struct irq_desc *desc); - +typedef void (*irq_preflow_handler_t)(struct irq_data *data); /* * IRQ line status. diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index 36c95f08023..2f87d644130 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -63,6 +63,9 @@ struct irq_desc { struct timer_rand_state *timer_rand_state; unsigned int __percpu *kstat_irqs; irq_flow_handler_t handle_irq; +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI + irq_preflow_handler_t preflow_handler; +#endif struct irqaction *action; /* IRQ action list */ #ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT unsigned int status_use_accessors; @@ -187,6 +190,17 @@ static inline void __set_irq_handler_unlocked(int irq, desc = irq_to_desc(irq); desc->handle_irq = handler; } + +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI +static inline void +__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + desc->preflow_handler = handler; +} +#endif #endif #endif diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 48ad25f5fa5..9149be729e4 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -35,6 +35,9 @@ config AUTO_IRQ_AFFINITY config HARDIRQS_SW_RESEND def_bool n +config IRQ_PREFLOW_FASTEOI + def_bool n + config SPARSE_IRQ bool "Support sparse irq numbering" depends on HAVE_SPARSE_IRQ diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 2a36038b8f5..08be5d182be 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -471,6 +471,16 @@ out_unlock: } EXPORT_SYMBOL_GPL(handle_level_irq); +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI +static inline void preflow_handler(struct irq_desc *desc) +{ + if (desc->preflow_handler) + desc->preflow_handler(&desc->irq_data); +} +#else +static inline void preflow_handler(struct irq_desc *desc) { } +#endif + /** * handle_fasteoi_irq - irq handler for transparent controllers * @irq: the interrupt number @@ -503,6 +513,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) mask_irq(desc); goto out; } + preflow_handler(desc); handle_irq_event(desc); out: desc->irq_data.chip->irq_eoi(&desc->irq_data); |