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genirq: Add fasteoi IPI flow 

For irqchips using the fasteoi flow, IPIs are a bit special.
They need to be EOI'd early (before calling the handler), as
funny things may happen in the handler (they do not necessarily
behave like a normal interrupt).

Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2020-05-19 10:41:00 +01:00
parent f4d51dffc6
commit c5e5ec033c
2 changed files with 28 additions and 0 deletions
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1
include/linux/irq.h
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@ -634,6 +634,7 @@ static inline int irq_set_parent(int irq, int parent_irq)
*/
extern void handle_level_irq(struct irq_desc *desc);
extern void handle_fasteoi_irq(struct irq_desc *desc);
extern void handle_percpu_devid_fasteoi_ipi(struct irq_desc *desc);
extern void handle_edge_irq(struct irq_desc *desc);
extern void handle_edge_eoi_irq(struct irq_desc *desc);
extern void handle_simple_irq(struct irq_desc *desc);

27
kernel/irq/chip.c
View File

@ -944,6 +944,33 @@ void handle_percpu_devid_irq(struct irq_desc *desc)
chip->irq_eoi(&desc->irq_data);
}
/**
* handle_percpu_devid_fasteoi_ipi - Per CPU local IPI handler with per cpu
* dev ids
* @desc: the interrupt description structure for this irq
*
* The biggest difference with the IRQ version is that the interrupt is
* EOIed early, as the IPI could result in a context switch, and we need to
* make sure the IPI can fire again. We also assume that the arch code has
* registered an action. If not, we are positively doomed.
*/
void handle_percpu_devid_fasteoi_ipi(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;
__kstat_incr_irqs_this_cpu(desc);
if (chip->irq_eoi)
chip->irq_eoi(&desc->irq_data);
trace_irq_handler_entry(irq, action);
res = action->handler(irq, raw_cpu_ptr(action->percpu_dev_id));
trace_irq_handler_exit(irq, action, res);
}
/**
* handle_percpu_devid_fasteoi_nmi - Per CPU local NMI handler with per cpu
* dev ids