struct ipi_mapping will provide a mechanism for irqchip code to fill out the mapping at reservation and to look it up when sending.
Signed-off-by: Qais Yousef <[email protected]> --- include/linux/irq.h | 21 +++++++++++++ kernel/irq/manage.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 2d3ff30c0cee..ccd53143cc1e 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -1008,4 +1008,25 @@ static inline void ipi_mask_set_cpumask(struct ipi_mask *ipimask, cpumask_copy(&ipimask->cpumask, cpumask); } +#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 a71175ff98d5..67a71667a359 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2001,3 +2001,89 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, return err; } EXPORT_SYMBOL_GPL(irq_set_irqchip_state); + +/** + * irq_alloc_ipi_mapping - allocate memory for struct ipi_mapping + * @nr_cpus: number of CPUs the mapping will have + * + * Will allocate and setup ipi_mapping structure. + * + * Returns a valid ipi_mapping pointer on success and NULL on error. + */ +struct ipi_mapping *irq_alloc_ipi_mapping(unsigned int nr_cpus) +{ + struct ipi_mapping *map; + int i; + + map = kzalloc(sizeof(struct ipi_mapping) + + BITS_TO_LONGS(nr_cpus), GFP_KERNEL); + if (!map) + return NULL; + + map->nr_cpus = nr_cpus; + + memset(map->cpumap, INVALID_HWIRQ, nr_cpus); + + return map; +} + +/** + * irq_free_ipi_mapping - release mempry associated with ipi_mapping struct + * @map: pointer to struct ipi_mapping to be freed + * + * Release the memory allocated for sturct ipi_mapping to the system. + */ +void irq_free_ipi_mapping(struct ipi_mapping *map) +{ + kfree(map); +} + +/** + * irq_map_ipi - create a CPU to HWIRQ mapping for an IPI + * @map: pointer to the mapping structure + * @cpu: the CPU to map + * @hwirq: the HWIRQ to associate with @cpu + * + * Returns zero on success and negative error number on failure. + */ +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; +} + +/** + * irq_unmap_ipi - remove the CPU mapping of an IPI + * @map: pointer to the mapping structure + * @cpu: the CPU to be unmapped + * @hwirq: pointer to HWIRQ to be filled with old value before unampping + * + * Mark the IPI mapping of a CPU to INVALID_HWIRQ setting @hwirq to the + * old value before unamapping. This old value might be required by the + * caller to return it to the pool of IPIs in a dynamic system. + * + * Returns zero on success and negative error number on failure. + */ +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/
