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| author | Marc Zyngier <maz@kernel.org> | 2020-05-19 10:41:00 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-09-13 17:04:38 +0100 |
| commit | c5e5ec033c4ab25c53f1fd217849e75deb0bf7bf (patch) | |
| tree | 172550cc4e01cfa8b16aa91e517b4cbf1c68a075 | |
| parent | f4d51dffc6c01a9e94650d95ce0104964f8ae822 (diff) | |
| download | linux-stable-c5e5ec033c4ab25c53f1fd217849e75deb0bf7bf.tar.gz linux-stable-c5e5ec033c4ab25c53f1fd217849e75deb0bf7bf.tar.bz2 linux-stable-c5e5ec033c4ab25c53f1fd217849e75deb0bf7bf.zip | |
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>
| -rw-r--r-- | include/linux/irq.h | 1 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 27 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 1b7f4dfee35b..57205bbf46bf 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -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); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 857f5f4c8098..bed517d5aa4d 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -945,6 +945,33 @@ void handle_percpu_devid_irq(struct irq_desc *desc) } /** + * 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 * @desc: the interrupt description structure for this irq |