diff options
| -rw-r--r-- | include/linux/irqdomain.h | 3 | ||||
| -rw-r--r-- | kernel/irq/irqdomain.c | 106 |
2 files changed, 89 insertions, 20 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index c65740d76e66..5abb533eb8eb 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -141,9 +141,8 @@ static inline struct irq_domain *irq_domain_add_legacy_isa( return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops, host_data); } -extern struct irq_domain *irq_find_host(struct device_node *node); -extern void irq_set_default_host(struct irq_domain *host); +extern void irq_domain_remove(struct irq_domain *host); extern unsigned int irq_create_mapping(struct irq_domain *host, irq_hw_number_t hwirq); diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 0e0ba5f840b2..41c1564103f1 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1,3 +1,5 @@ +#define pr_fmt(fmt) "irq: " fmt + #include <linux/debugfs.h> #include <linux/hardirq.h> #include <linux/interrupt.h> @@ -56,14 +58,73 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node, return domain; } +static void irq_domain_free(struct irq_domain *domain) +{ + of_node_put(domain->of_node); + kfree(domain); +} + static void irq_domain_add(struct irq_domain *domain) { mutex_lock(&irq_domain_mutex); list_add(&domain->link, &irq_domain_list); mutex_unlock(&irq_domain_mutex); - pr_debug("irq: Allocated domain of type %d @0x%p\n", + pr_debug("Allocated domain of type %d @0x%p\n", + domain->revmap_type, domain); +} + +/** + * irq_domain_remove() - Remove an irq domain. + * @domain: domain to remove + * + * This routine is used to remove an irq domain. The caller must ensure + * that all mappings within the domain have been disposed of prior to + * use, depending on the revmap type. + */ +void irq_domain_remove(struct irq_domain *domain) +{ + mutex_lock(&irq_domain_mutex); + + switch (domain->revmap_type) { + case IRQ_DOMAIN_MAP_LEGACY: + /* + * Legacy domains don't manage their own irq_desc + * allocations, we expect the caller to handle irq_desc + * freeing on their own. + */ + break; + case IRQ_DOMAIN_MAP_TREE: + /* + * radix_tree_delete() takes care of destroying the root + * node when all entries are removed. Shout if there are + * any mappings left. + */ + WARN_ON(domain->revmap_data.tree.height); + break; + case IRQ_DOMAIN_MAP_LINEAR: + kfree(domain->revmap_data.linear.revmap); + domain->revmap_data.linear.size = 0; + break; + case IRQ_DOMAIN_MAP_NOMAP: + break; + } + + list_del(&domain->link); + + /* + * If the going away domain is the default one, reset it. + */ + if (unlikely(irq_default_domain == domain)) + irq_set_default_host(NULL); + + mutex_unlock(&irq_domain_mutex); + + pr_debug("Removed domain of type %d @0x%p\n", domain->revmap_type, domain); + + irq_domain_free(domain); } +EXPORT_SYMBOL_GPL(irq_domain_remove); static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain, irq_hw_number_t hwirq) @@ -117,8 +178,7 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, if (WARN_ON(!irq_data || irq_data->domain)) { mutex_unlock(&irq_domain_mutex); - of_node_put(domain->of_node); - kfree(domain); + irq_domain_free(domain); return NULL; } } @@ -152,10 +212,12 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, irq_domain_add(domain); return domain; } +EXPORT_SYMBOL_GPL(irq_domain_add_legacy); /** * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain. * @of_node: pointer to interrupt controller's device tree node. + * @size: Number of interrupts in the domain. * @ops: map/unmap domain callbacks * @host_data: Controller private data pointer */ @@ -181,6 +243,7 @@ struct irq_domain *irq_domain_add_linear(struct device_node *of_node, irq_domain_add(domain); return domain; } +EXPORT_SYMBOL_GPL(irq_domain_add_linear); struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, unsigned int max_irq, @@ -195,6 +258,7 @@ struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, } return domain; } +EXPORT_SYMBOL_GPL(irq_domain_add_nomap); /** * irq_domain_add_tree() @@ -216,6 +280,7 @@ struct irq_domain *irq_domain_add_tree(struct device_node *of_node, } return domain; } +EXPORT_SYMBOL_GPL(irq_domain_add_tree); /** * irq_find_host() - Locates a domain for a given device node @@ -259,10 +324,11 @@ EXPORT_SYMBOL_GPL(irq_find_host); */ void irq_set_default_host(struct irq_domain *domain) { - pr_debug("irq: Default domain set to @0x%p\n", domain); + pr_debug("Default domain set to @0x%p\n", domain); irq_default_domain = domain; } +EXPORT_SYMBOL_GPL(irq_set_default_host); static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, irq_hw_number_t hwirq) @@ -272,7 +338,7 @@ static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, irq_data->hwirq = hwirq; irq_data->domain = domain; if (domain->ops->map(domain, virq, hwirq)) { - pr_debug("irq: -> mapping failed, freeing\n"); + pr_debug("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq); irq_data->domain = NULL; irq_data->hwirq = 0; return -1; @@ -303,7 +369,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) virq = irq_alloc_desc_from(1, 0); if (!virq) { - pr_debug("irq: create_direct virq allocation failed\n"); + pr_debug("create_direct virq allocation failed\n"); return 0; } if (virq >= domain->revmap_data.nomap.max_irq) { @@ -312,7 +378,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) irq_free_desc(virq); return 0; } - pr_debug("irq: create_direct obtained virq %d\n", virq); + pr_debug("create_direct obtained virq %d\n", virq); if (irq_setup_virq(domain, virq, virq)) { irq_free_desc(virq); @@ -321,6 +387,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) return virq; } +EXPORT_SYMBOL_GPL(irq_create_direct_mapping); /** * irq_create_mapping() - Map a hardware interrupt into linux irq space @@ -338,23 +405,23 @@ unsigned int irq_create_mapping(struct irq_domain *domain, unsigned int hint; int virq; - pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); + pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); /* Look for default domain if nececssary */ if (domain == NULL) domain = irq_default_domain; if (domain == NULL) { - printk(KERN_WARNING "irq_create_mapping called for" - " NULL domain, hwirq=%lx\n", hwirq); + pr_warning("irq_create_mapping called for" + " NULL domain, hwirq=%lx\n", hwirq); WARN_ON(1); return 0; } - pr_debug("irq: -> using domain @%p\n", domain); + pr_debug("-> using domain @%p\n", domain); /* Check if mapping already exists */ virq = irq_find_mapping(domain, hwirq); if (virq) { - pr_debug("irq: -> existing mapping on virq %d\n", virq); + pr_debug("-> existing mapping on virq %d\n", virq); return virq; } @@ -370,7 +437,7 @@ unsigned int irq_create_mapping(struct irq_domain *domain, if (virq <= 0) virq = irq_alloc_desc_from(1, 0); if (virq <= 0) { - pr_debug("irq: -> virq allocation failed\n"); + pr_debug("-> virq allocation failed\n"); return 0; } @@ -380,7 +447,7 @@ unsigned int irq_create_mapping(struct irq_domain *domain, return 0; } - pr_debug("irq: irq %lu on domain %s mapped to virtual irq %u\n", + pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", hwirq, domain->of_node ? domain->of_node->full_name : "null", virq); return virq; @@ -409,8 +476,8 @@ unsigned int irq_create_of_mapping(struct device_node *controller, if (intsize > 0) return intspec[0]; #endif - printk(KERN_WARNING "irq: no irq domain found for %s !\n", - controller->full_name); + pr_warning("no irq domain found for %s !\n", + controller->full_name); return 0; } @@ -560,6 +627,7 @@ unsigned int irq_radix_revmap_lookup(struct irq_domain *domain, */ return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq); } +EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup); /** * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping. @@ -584,6 +652,7 @@ void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq, mutex_unlock(&revmap_trees_mutex); } } +EXPORT_SYMBOL_GPL(irq_radix_revmap_insert); /** * irq_linear_revmap() - Find a linux irq from a hw irq number. @@ -617,6 +686,7 @@ unsigned int irq_linear_revmap(struct irq_domain *domain, return revmap[hwirq]; } +EXPORT_SYMBOL_GPL(irq_linear_revmap); #ifdef CONFIG_IRQ_DOMAIN_DEBUG static int virq_debug_show(struct seq_file *m, void *private) @@ -691,8 +761,8 @@ static int __init irq_debugfs_init(void) __initcall(irq_debugfs_init); #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ -int irq_domain_simple_map(struct irq_domain *d, unsigned int irq, - irq_hw_number_t hwirq) +static int irq_domain_simple_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) { return 0; } |