There are 2 variants. __irq_desc_send_ipi() is meant to be used by arch code to save the desc lookup when doing SMP IPIs.
irq_send_ipi() is meant for drivers that want to send IPIs to coprocessors they interact with. Signed-off-by: Qais Yousef <[email protected]> --- include/linux/irq.h | 3 +++ kernel/irq/manage.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 69 insertions(+), 1 deletion(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index 3b2f448b7ac3..680bee078879 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -1032,4 +1032,7 @@ int irq_map_ipi(struct ipi_mapping *map, int irq_unmap_ipi(struct ipi_mapping *map, unsigned int cpu, irq_hw_number_t *hwirq); +int __irq_desc_send_ipi(struct irq_desc *desc, const struct ipi_mask *dest); +int irq_send_ipi(unsigned int virq, const struct ipi_mask *dest); + #endif /* _LINUX_IRQ_H */ diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 67a71667a359..4bdf6df95b45 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2013,7 +2013,6 @@ 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) + BITS_TO_LONGS(nr_cpus), GFP_KERNEL); @@ -2087,3 +2086,69 @@ int irq_unmap_ipi(struct ipi_mapping *map, return 0; } + +/** + * __irq_desc_send_ipi - send an IPI to target CPU(s) + * @irq_desc: pointer to irq_desc of the IRQ + * @dest: dest CPU(s), must be the same or a subset of the mask passed to + * irq_reserve_ipi() + * + * Sends an IPI to all cpus in dest mask. + * This function is meant to be used from arch code to save the need to do + * desc lookup that happens in the generic irq_send_ipi(). + * + * Returns zero on success and negative error number on failure. + */ +int __irq_desc_send_ipi(struct irq_desc *desc, const struct ipi_mask *dest) +{ + struct irq_data *data = irq_desc_get_irq_data(desc); + struct irq_chip *chip = irq_data_get_irq_chip(data); + + if (!chip || !chip->irq_send_ipi) + return -EINVAL; + + if (dest->nbits > data->common->ipi_mask->nbits) + return -EINVAL; + + /* + * Do not validate the mask for IPIs marked global. These are + * regular IPIs so we can avoid the operation as their target + * mask is the cpu_possible_mask. + */ + if (!data->common->ipi_mask->global) { + if (dest->global) + return -EINVAL; + + if (!bitmap_subset(dest->cpu_bitmap, + data->common->ipi_mask->cpu_bitmap, + dest->nbits)) + return -EINVAL; + } else { + if (!dest->global) + return -EINVAL; + } + + chip->irq_send_ipi(data, dest); + return 0; +} + +/** + * irq_send_ipi - send an IPI to target CPU(s) + * @irq: linux irq number from irq_reserve_ipi() + * @dest: dest CPU(s), must be the same or a subset of the mask passed to + * irq_reserve_ipi() + * + * Sends an IPI to all cpus in dest mask. + * + * Returns zero on success and negative error number on failure. + */ +int irq_send_ipi(unsigned int virq, const struct ipi_mask *dest) +{ + struct irq_desc *desc = irq_to_desc(virq); + + if (!desc) + return -EINVAL; + + return __irq_desc_send_ipi(desc, dest); +} +EXPORT_SYMBOL_GPL(irq_send_ipi); -- 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/
