Add a flags to irq_domain.flags to control whether the irqdomain core should automatically call parent irqdomain's alloc/free callbacks. It help to reduce hierarchy irqdomains users' code size.
Signed-off-by: Jiang Liu <[email protected]> --- include/linux/irqdomain.h | 24 ++++++----------- kernel/irq/irqdomain.c | 66 +++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 72 insertions(+), 18 deletions(-) diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index fbe542967c20..ad92b0b15945 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -130,6 +130,8 @@ struct irq_domain { }; #define IRQ_DOMAIN_FLAG_HIERARCHY 0x1 +/* Framework automatically calls parent domain's alloc()/free() */ +#define IRQ_DOMAIN_FLAG_AUTO_RECURSIVE 0x2 #define IRQ_DOMAIN_FLAG_ARCH1 0x10000 #ifdef CONFIG_IRQ_DOMAIN @@ -274,22 +276,12 @@ extern void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int nr_irqs); extern void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs); - -static inline int irq_domain_alloc_irqs_parent(struct irq_domain *domain, - unsigned int irq_base, unsigned int nr_irqs, void *arg) -{ - if (domain->parent && domain->parent->ops->alloc) - return domain->parent->ops->alloc(domain->parent, irq_base, - nr_irqs, arg); - return -ENOSYS; -} - -static inline void irq_domain_free_irqs_parent(struct irq_domain *domain, - unsigned int irq_base, unsigned int nr_irqs) -{ - if (domain->parent && domain->parent->ops->free) - domain->parent->ops->free(domain->parent, irq_base, nr_irqs); -} +extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain, + unsigned int irq_base, + unsigned int nr_irqs, void *arg); +extern void irq_domain_free_irqs_parent(struct irq_domain *domain, + unsigned int irq_base, + unsigned int nr_irqs); static inline bool irq_domain_is_hierarchy(struct irq_domain *domain) { diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 705fb573e509..03fc7d018324 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -925,6 +925,43 @@ void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq, irq_domain_free_irqs_common(domain, virq, nr_irqs); } +static bool irq_domain_is_auto_recursive(struct irq_domain *domain) +{ + return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE; +} + +static void irq_domain_free_irqs_recursive(struct irq_domain *domain, + unsigned int irq_base, + unsigned int nr_irqs) +{ + domain->ops->free(domain, irq_base, nr_irqs); + if (irq_domain_is_auto_recursive(domain)) { + BUG_ON(!domain->parent); + irq_domain_free_irqs_recursive(domain->parent, irq_base, + nr_irqs); + } +} + +static int irq_domain_alloc_irqs_recursive(struct irq_domain *domain, + unsigned int irq_base, + unsigned int nr_irqs, void *arg) +{ + int ret = 0; + struct irq_domain *parent = domain->parent; + bool recursive = irq_domain_is_auto_recursive(domain); + + BUG_ON(recursive && !parent); + if (recursive) + ret = irq_domain_alloc_irqs_recursive(parent, irq_base, + nr_irqs, arg); + if (ret >= 0) + ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg); + if (ret < 0 && recursive) + irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs); + + return ret; +} + /** * __irq_domain_alloc_irqs - Allocate IRQs from domain * @domain: domain to allocate from @@ -981,7 +1018,7 @@ int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, } mutex_lock(&irq_domain_mutex); - ret = domain->ops->alloc(domain, virq, nr_irqs, arg); + ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg); if (ret < 0) { mutex_unlock(&irq_domain_mutex); goto out_free_irq_data; @@ -1016,13 +1053,38 @@ void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs) mutex_lock(&irq_domain_mutex); for (i = 0; i < nr_irqs; i++) irq_domain_remove_irq(virq + i); - data->domain->ops->free(data->domain, virq, nr_irqs); + irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs); mutex_unlock(&irq_domain_mutex); irq_domain_free_irq_data(virq, nr_irqs); irq_free_descs(virq, nr_irqs); } +int irq_domain_alloc_irqs_parent(struct irq_domain *domain, + unsigned int irq_base, unsigned int nr_irqs, + void *arg) +{ + /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */ + if (irq_domain_is_auto_recursive(domain)) + return 0; + + domain = domain->parent; + if (domain) + return irq_domain_alloc_irqs_recursive(domain, irq_base, + nr_irqs, arg); + + return -ENOSYS; +} + +void irq_domain_free_irqs_parent(struct irq_domain *domain, + unsigned int irq_base, unsigned int nr_irqs) +{ + /* irq_domain_free_irqs_recursive() will call parent's free */ + if (!irq_domain_is_auto_recursive(domain)) + irq_domain_free_irqs_recursive(domain->parent, irq_base, + nr_irqs); +} + /** * irq_domain_activate_irq - Call domain_ops->activate recursively to activate * interrupt -- 1.7.10.4 -- 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/
