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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: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-03-28 16:13:24 +02:00
parent 32f4125ebf
commit 0521c8fbb3
3 changed files with 50 additions and 0 deletions
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1
include/linux/irq.h
View File

@ -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);

4
kernel/irq/Kconfig
View File

@ -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

45
kernel/irq/chip.c
View File

@ -604,6 +604,51 @@ out_unlock:
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