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genirq: Add handle_fasteoi_{level,edge}_irq flow handlers 

Follow-on patch for gpio-thunderx uses a irqdomain hierarchy which
requires slightly different flow handlers, add them to chip.c which
contains most of the other flow handlers.  Make these conditionally
compiled based on CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org
Link: http://lkml.kernel.org/r/1503017616-3252-3-git-send-email-david.daney@cavium.com
This commit is contained in:
David Daney 2017-08-17 17:53:31 -07:00 committed by Thomas Gleixner
parent 65efd9a49a
commit 7703b08cc9
3 changed files with 112 additions and 0 deletions
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2
include/linux/irq.h
View File

@ -568,6 +568,8 @@ extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg);
extern int irq_chip_pm_get(struct irq_data *data);
extern int irq_chip_pm_put(struct irq_data *data);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
extern void handle_fasteoi_ack_irq(struct irq_desc *desc);
extern void handle_fasteoi_mask_irq(struct irq_desc *desc);
extern void irq_chip_enable_parent(struct irq_data *data);
extern void irq_chip_disable_parent(struct irq_data *data);
extern void irq_chip_ack_parent(struct irq_data *data);

4
kernel/irq/Kconfig
View File

@ -73,6 +73,10 @@ config IRQ_DOMAIN_HIERARCHY
bool
select IRQ_DOMAIN
# Support for hierarchical fasteoi+edge and fasteoi+level handlers
config IRQ_FASTEOI_HIERARCHY_HANDLERS
bool
# Generic IRQ IPI support
config GENERIC_IRQ_IPI
bool

106
kernel/irq/chip.c
View File

@ -1092,6 +1092,112 @@ void irq_cpu_offline(void)
}
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
#ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
/**
* handle_fasteoi_ack_irq - irq handler for edge hierarchy
* stacked on transparent controllers
*
* @desc: the interrupt description structure for this irq
*
* Like handle_fasteoi_irq(), but for use with hierarchy where
* the irq_chip also needs to have its ->irq_ack() function
* called.
*/
void handle_fasteoi_ack_irq(struct irq_desc *desc)
{
struct irq_chip *chip = desc->irq_data.chip;
raw_spin_lock(&desc->lock);
if (!irq_may_run(desc))
goto out;
desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
/*
* If its disabled or no action available
* then mask it and get out of here:
*/
if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
desc->istate |= IRQS_PENDING;
mask_irq(desc);
goto out;
}
kstat_incr_irqs_this_cpu(desc);
if (desc->istate & IRQS_ONESHOT)
mask_irq(desc);
/* Start handling the irq */
desc->irq_data.chip->irq_ack(&desc->irq_data);
preflow_handler(desc);
handle_irq_event(desc);
cond_unmask_eoi_irq(desc, chip);
raw_spin_unlock(&desc->lock);
return;
out:
if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
chip->irq_eoi(&desc->irq_data);
raw_spin_unlock(&desc->lock);
}
EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);
/**
* handle_fasteoi_mask_irq - irq handler for level hierarchy
* stacked on transparent controllers
*
* @desc: the interrupt description structure for this irq
*
* Like handle_fasteoi_irq(), but for use with hierarchy where
* the irq_chip also needs to have its ->irq_mask_ack() function
* called.
*/
void handle_fasteoi_mask_irq(struct irq_desc *desc)
{
struct irq_chip *chip = desc->irq_data.chip;
raw_spin_lock(&desc->lock);
mask_ack_irq(desc);
if (!irq_may_run(desc))
goto out;
desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
/*
* If its disabled or no action available
* then mask it and get out of here:
*/
if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
desc->istate |= IRQS_PENDING;
mask_irq(desc);
goto out;
}
kstat_incr_irqs_this_cpu(desc);
if (desc->istate & IRQS_ONESHOT)
mask_irq(desc);
preflow_handler(desc);
handle_irq_event(desc);
cond_unmask_eoi_irq(desc, chip);
raw_spin_unlock(&desc->lock);
return;
out:
if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
chip->irq_eoi(&desc->irq_data);
raw_spin_unlock(&desc->lock);
}
EXPORT_SYMBOL_GPL(handle_fasteoi_mask_irq);
#endif /* CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS */
/**
* irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
* NULL)