Add a routine allowing to retrieve the offset corresponding with an allocated interrupt number from an irq_sim object.
Signed-off-by: Bartosz Golaszewski <[email protected]> --- include/linux/irq_sim.h | 1 + kernel/irq/irq_sim.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/irq_sim.h b/include/linux/irq_sim.h index 246f593face8..e9768ca81e3e 100644 --- a/include/linux/irq_sim.h +++ b/include/linux/irq_sim.h @@ -41,5 +41,6 @@ void irq_sim_fini(struct irq_sim *sim); void irq_sim_fire(struct irq_sim *sim, unsigned int offset); int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset); int irq_sim_baseirq(struct irq_sim *sim); +unsigned int irq_sim_irq2offset(struct irq_sim *sim, int irq); #endif /* _LINUX_IRQ_SIM_H */ diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c index 1be10d0e295f..9a9a1bc8853c 100644 --- a/kernel/irq/irq_sim.c +++ b/kernel/irq/irq_sim.c @@ -174,3 +174,18 @@ int irq_sim_baseirq(struct irq_sim *sim) return irq_sim_irqnum(sim, 0); } EXPORT_SYMBOL_GPL(irq_sim_baseirq); + +/** + * irq_sim_irq2offset - Get the offset of an allocated interrupt. + * + * @sim: The interrupt simulator object. + * irq: Allocated interrupt number. + * + * Perform a reverse lookup for the interrupt number and return its offset in + * the array allocated by sim_irq. + */ +unsigned int irq_sim_irq2offset(struct irq_sim *sim, int irq) +{ + return irq - sim->irq_base; +} +EXPORT_SYMBOL_GPL(irq_sim_irq2offset); -- 2.13.2
