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genirq: Provide NMI handlers

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Provide flow handlers that are NMI safe for interrupts and percpu_devid
interrupts.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Julien Thierry 2019-01-31 14:54:00 +00:00 committed by Marc Zyngier
parent 4b078c3f1a
commit 2dcf1fbcad
2 changed files with 57 additions and 0 deletions
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3
include/linux/irq.h
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@ -601,6 +601,9 @@ extern void handle_percpu_devid_irq(struct irq_desc *desc);
extern void handle_bad_irq(struct irq_desc *desc); extern void handle_bad_irq(struct irq_desc *desc);
extern void handle_nested_irq(unsigned int irq); extern void handle_nested_irq(unsigned int irq);
extern void handle_fasteoi_nmi(struct irq_desc *desc);
extern void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc);
extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg); 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_get(struct irq_data *data);
extern int irq_chip_pm_put(struct irq_data *data); extern int irq_chip_pm_put(struct irq_data *data);

54
kernel/irq/chip.c
View File

@ -729,6 +729,37 @@ void handle_fasteoi_irq(struct irq_desc *desc)
} }
EXPORT_SYMBOL_GPL(handle_fasteoi_irq); EXPORT_SYMBOL_GPL(handle_fasteoi_irq);
/**
* handle_fasteoi_nmi - irq handler for NMI interrupt lines
* @desc: the interrupt description structure for this irq
*
* A simple NMI-safe handler, considering the restrictions
* from request_nmi.
*
* Only a single callback will be issued to the chip: an ->eoi()
* call when the interrupt has been serviced. This enables support
* for modern forms of interrupt handlers, which handle the flow
* details in hardware, transparently.
*/
void handle_fasteoi_nmi(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct irqaction *action = desc->action;
unsigned int irq = irq_desc_get_irq(desc);
irqreturn_t res;
trace_irq_handler_entry(irq, action);
/*
* NMIs cannot be shared, there is only one action.
*/
res = action->handler(irq, action->dev_id);
trace_irq_handler_exit(irq, action, res);
if (chip->irq_eoi)
chip->irq_eoi(&desc->irq_data);
}
EXPORT_SYMBOL_GPL(handle_fasteoi_nmi);
/** /**
* handle_edge_irq - edge type IRQ handler * handle_edge_irq - edge type IRQ handler
* @desc: the interrupt description structure for this irq * @desc: the interrupt description structure for this irq
@ -908,6 +939,29 @@ void handle_percpu_devid_irq(struct irq_desc *desc)
chip->irq_eoi(&desc->irq_data); chip->irq_eoi(&desc->irq_data);
} }
/**
* handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
* dev ids
* @desc: the interrupt description structure for this irq
*
* Similar to handle_fasteoi_nmi, but handling the dev_id cookie
* as a percpu pointer.
*/
void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct irqaction *action = desc->action;
unsigned int irq = irq_desc_get_irq(desc);
irqreturn_t res;
trace_irq_handler_entry(irq, action);
res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
trace_irq_handler_exit(irq, action, res);
if (chip->irq_eoi)
chip->irq_eoi(&desc->irq_data);
}
static void static void
__irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle, __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
int is_chained, const char *name) int is_chained, const char *name)