diff options
author | Thomas Gleixner | 2011-03-28 16:13:24 +0200 |
---|---|---|
committer | Thomas Gleixner | 2011-03-28 16:55:11 +0200 |
commit | 0521c8fbb3da45c2a58cd551ca6e9644983f6028 (patch) | |
tree | d2ed3452a75f1d3ff516cd02c86f4371db81e06e /kernel/irq | |
parent | 32f4125ebffee4f3c4dbc6a437fc656129eb9e60 (diff) |
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>
Diffstat (limited to 'kernel/irq')
-rw-r--r-- | kernel/irq/Kconfig | 4 | ||||
-rw-r--r-- | kernel/irq/chip.c | 45 |
2 files changed, 49 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 00f2c037267a..72606ba10b14 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -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 diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index e00bdc56269f..451d1e81c15c 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -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 |