For irqchips using the fasteoi flow, IPIs are a bit special. They need to be EOId early (before calling the handler), as funny things may happen in the handler (they do not necessarily behave like a normal interrupt), and that the arch code is already handling the stats.
Signed-off-by: Marc Zyngier <[email protected]> --- include/linux/irq.h | 1 + kernel/irq/chip.c | 26 ++++++++++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 8d5bc2c237d7..726f94d8b8cc 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -621,6 +621,7 @@ 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); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 41e7e37a0928..7b0b789cfed4 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -955,6 +955,32 @@ 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 differences with the IRQ version are 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 + * - Stats are usually handled at the architecture level, so we ignore them + * here + */ +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; + + 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 -- 2.26.2
