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Commit 78129576 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: David S. Miller <davem@davemloft.net>
parent 3836ca08

include/linux/irq.h

+2 −1
Original line number Original line Diff line number Diff line
@@ -29,9 +29,10 @@ 
#include <asm/irq_regs.h>

#include <asm/irq_regs.h>





struct irq_desc;

struct irq_desc;

struct irq_data;

typedef	void (*irq_flow_handler_t)(unsigned int irq,

typedef	void (*irq_flow_handler_t)(unsigned int irq,

					    struct irq_desc *desc);

					    struct irq_desc *desc);



typedef	void (*irq_preflow_handler_t)(struct irq_data *data);





/*

/*

 * IRQ line status.

 * IRQ line status.

include/linux/irqdesc.h

+14 −0
Original line number Original line Diff line number Diff line
@@ -63,6 +63,9 @@ struct irq_desc { 
	struct timer_rand_state *timer_rand_state;

	struct timer_rand_state *timer_rand_state;

	unsigned int __percpu	*kstat_irqs;

	unsigned int __percpu	*kstat_irqs;

	irq_flow_handler_t	handle_irq;

	irq_flow_handler_t	handle_irq;

#ifdef CONFIG_IRQ_PREFLOW_FASTEOI

	irq_preflow_handler_t	preflow_handler;

#endif

	struct irqaction	*action;	/* IRQ action list */

	struct irqaction	*action;	/* IRQ action list */

#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT

#ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT

	unsigned int		status_use_accessors;

	unsigned int		status_use_accessors;
@@ -187,6 +190,17 @@ static inline void __set_irq_handler_unlocked(int irq, 
	desc = irq_to_desc(irq);

	desc = irq_to_desc(irq);

	desc->handle_irq = handler;

	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





#endif
 
#endif

kernel/irq/Kconfig

+3 −0
Original line number Original line Diff line number Diff line
@@ -35,6 +35,9 @@ config AUTO_IRQ_AFFINITY 
config HARDIRQS_SW_RESEND

config HARDIRQS_SW_RESEND

       def_bool n

       def_bool n





config IRQ_PREFLOW_FASTEOI

       def_bool n



config SPARSE_IRQ

config SPARSE_IRQ

	bool "Support sparse irq numbering"

	bool "Support sparse irq numbering"

	depends on HAVE_SPARSE_IRQ

	depends on HAVE_SPARSE_IRQ

kernel/irq/chip.c

+11 −0
Original line number Original line Diff line number Diff line
@@ -471,6 +471,16 @@ out_unlock: 
}

}

EXPORT_SYMBOL_GPL(handle_level_irq);

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

 *	handle_fasteoi_irq - irq handler for transparent controllers

 *	@irq:	the interrupt number

 *	@irq:	the interrupt number
@@ -503,6 +513,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) 
		mask_irq(desc);

		mask_irq(desc);

		goto out;

		goto out;

	}

	}

	preflow_handler(desc);

	handle_irq_event(desc);

	handle_irq_event(desc);

out:

out:

	desc->irq_data.chip->irq_eoi(&desc->irq_data);

	desc->irq_data.chip->irq_eoi(&desc->irq_data);