Commit 0521c8fb authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

genirq: Provide edge_eoi flow handler 



This is a replacment for the cell flow handler which is in the way of
cleanups. Must be selected to avoid general bloat.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 32f4125e

include/linux/irq.h

+1 −0
Original line number Diff line number Diff line
@@ -423,6 +423,7 @@ extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action); 
extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);

kernel/irq/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -51,6 +51,10 @@ config HARDIRQS_SW_RESEND 
config IRQ_PREFLOW_FASTEOI

       bool



# Edge style eoi based handler (cell)

config IRQ_EDGE_EOI_HANDLER

       bool



# Support forced irq threading

config IRQ_FORCED_THREADING

       bool

kernel/irq/chip.c

+45 −0
Original line number Diff line number Diff line
@@ -604,6 +604,51 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc) 
	raw_spin_unlock(&desc->lock);

}



#ifdef CONFIG_IRQ_EDGE_EOI_HANDLER

/**

 *	handle_edge_eoi_irq - edge eoi type IRQ handler

 *	@irq:	the interrupt number

 *	@desc:	the interrupt description structure for this irq

 *

 * Similar as the above handle_edge_irq, but using eoi and w/o the

 * mask/unmask logic.

 */

void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc)

{

	struct irq_chip *chip = irq_desc_get_chip(desc);



	raw_spin_lock(&desc->lock);



	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);

	/*

	 * If we're currently running this IRQ, or its disabled,

	 * we shouldn't process the IRQ. Mark it pending, handle

	 * the necessary masking and go out

	 */

	if (unlikely(irqd_irq_disabled(&desc->irq_data) ||

		     irqd_irq_inprogress(&desc->irq_data) || !desc->action)) {

		if (!irq_check_poll(desc)) {

			desc->istate |= IRQS_PENDING;

			goto out_eoi;

		}

	}

	kstat_incr_irqs_this_cpu(irq, desc);



	do {

		if (unlikely(!desc->action))

			goto out_eoi;



		handle_irq_event(desc);



	} while ((desc->istate & IRQS_PENDING) &&

		 !irqd_irq_disabled(&desc->irq_data));



out_unlock:

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

	raw_spin_unlock(&desc->lock);

}

#endif



/**

 *	handle_percpu_irq - Per CPU local irq handler

 *	@irq:	the interrupt number