struct ipi_mapping will provide a mechanism for irqdomain/architure code to fill out the mapping for the generic code later to implement generic IPI reserve and send functions.
Signed-off-by: Qais Yousef <[email protected]> --- include/linux/irq.h | 21 +++++++++++++++++++ kernel/irq/manage.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 80 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index b000b217ea24..c3d0f26c3eff 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -964,4 +964,25 @@ static inline u32 irq_reg_readl(struct irq_chip_generic *gc, return readl(gc->reg_base + reg_offset); } +#define INVALID_HWIRQ -1 + +/** + * struct ipi_mapping - IPI mapping information object + * @nr_hwirqs: number of hwirqs mapped + * @nr_cpus: number of cpus the controller can talk to + * @cpumap: per cpu hwirq mapping table + */ +struct ipi_mapping { + unsigned int nr_hwirqs; + unsigned int nr_cpus; + unsigned int *cpumap; +}; + +struct ipi_mapping *irq_alloc_ipi_mapping(unsigned int nr_cpus); +void irq_free_ipi_mapping(struct ipi_mapping *map); +int irq_map_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t hwirq); +int irq_unmap_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t *hwirq); + #endif /* _LINUX_IRQ_H */ diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index f9a59f6cabd2..9a9bc0822c8f 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1924,3 +1924,62 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, return err; } EXPORT_SYMBOL_GPL(irq_set_irqchip_state); + +struct ipi_mapping *irq_alloc_ipi_mapping(unsigned int nr_cpus) +{ + struct ipi_mapping *map; + int i; + + map = kzalloc(sizeof(struct ipi_mapping), GFP_KERNEL); + if (!map) + return NULL; + + map->nr_cpus = nr_cpus; + + map->cpumap = kmalloc(sizeof(irq_hw_number_t) * nr_cpus, GFP_KERNEL); + if (!map->cpumap) { + kfree(map); + return NULL; + } + + for (i = 0; i < nr_cpus; i++) + map->cpumap[i] = INVALID_HWIRQ; + + return map; +} + +void irq_free_ipi_mapping(struct ipi_mapping *map) +{ + kfree(map->cpumap); + kfree(map); +} + +int irq_map_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t hwirq) +{ + if (cpu >= map->nr_cpus) + return -EINVAL; + + map->cpumap[cpu] = hwirq; + map->nr_hwirqs++; + + return 0; +} + +int irq_unmap_ipi(struct ipi_mapping *map, + unsigned int cpu, irq_hw_number_t *hwirq) +{ + if (cpu >= map->nr_cpus) + return -EINVAL; + + if (map->cpumap[cpu] == INVALID_HWIRQ) + return -EINVAL; + + if (hwirq) + *hwirq = map->cpumap[cpu]; + + map->cpumap[cpu] = INVALID_HWIRQ; + map->nr_hwirqs--; + + return 0; +} -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
