diff options
Diffstat (limited to 'kernel/irq/irqdomain.c')
| -rw-r--r-- | kernel/irq/irqdomain.c | 153 |
1 files changed, 105 insertions, 48 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 3601f3fbf67c..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> @@ -23,7 +25,6 @@ static LIST_HEAD(irq_domain_list); static DEFINE_MUTEX(irq_domain_mutex); static DEFINE_MUTEX(revmap_trees_mutex); -static unsigned int irq_virq_count = NR_IRQS; static struct irq_domain *irq_default_domain; /** @@ -57,14 +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) @@ -118,8 +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; } } @@ -153,10 +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 */ @@ -182,17 +243,22 @@ 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, const struct irq_domain_ops *ops, void *host_data) { struct irq_domain *domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_NOMAP, ops, host_data); - if (domain) + if (domain) { + domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0; irq_domain_add(domain); + } return domain; } +EXPORT_SYMBOL_GPL(irq_domain_add_nomap); /** * irq_domain_add_tree() @@ -214,6 +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 @@ -257,26 +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; } - -/** - * irq_set_virq_count() - Set the maximum number of linux irqs - * @count: number of linux irqs, capped with NR_IRQS - * - * This is mainly for use by platforms like iSeries who want to program - * the virtual irq number in the controller to avoid the reverse mapping - */ -void irq_set_virq_count(unsigned int count) -{ - pr_debug("irq: Trying to set virq count to %d\n", count); - - BUG_ON(count < NUM_ISA_INTERRUPTS); - if (count < NR_IRQS) - irq_virq_count = count; -} +EXPORT_SYMBOL_GPL(irq_set_default_host); static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, irq_hw_number_t hwirq) @@ -286,7 +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; @@ -317,17 +369,16 @@ 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 >= irq_virq_count) { + if (virq >= domain->revmap_data.nomap.max_irq) { pr_err("ERROR: no free irqs available below %i maximum\n", - irq_virq_count); + domain->revmap_data.nomap.max_irq); 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); @@ -336,6 +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 @@ -350,25 +402,26 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) unsigned int irq_create_mapping(struct irq_domain *domain, irq_hw_number_t hwirq) { - unsigned int virq, hint; + 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; } @@ -377,14 +430,14 @@ unsigned int irq_create_mapping(struct irq_domain *domain, return irq_domain_legacy_revmap(domain, hwirq); /* Allocate a virtual interrupt number */ - hint = hwirq % irq_virq_count; + hint = hwirq % nr_irqs; if (hint == 0) hint++; virq = irq_alloc_desc_from(hint, 0); - if (!virq) + if (virq <= 0) virq = irq_alloc_desc_from(1, 0); - if (!virq) { - pr_debug("irq: -> virq allocation failed\n"); + if (virq <= 0) { + pr_debug("-> virq allocation failed\n"); return 0; } @@ -394,7 +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; @@ -423,8 +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; } @@ -515,7 +568,7 @@ unsigned int irq_find_mapping(struct irq_domain *domain, irq_hw_number_t hwirq) { unsigned int i; - unsigned int hint = hwirq % irq_virq_count; + unsigned int hint = hwirq % nr_irqs; /* Look for default domain if nececssary */ if (domain == NULL) @@ -536,7 +589,7 @@ unsigned int irq_find_mapping(struct irq_domain *domain, if (data && (data->domain == domain) && (data->hwirq == hwirq)) return i; i++; - if (i >= irq_virq_count) + if (i >= nr_irqs) i = 1; } while(i != hint); return 0; @@ -574,6 +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. @@ -598,6 +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. @@ -631,6 +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) @@ -642,8 +698,9 @@ static int virq_debug_show(struct seq_file *m, void *private) void *data; int i; - seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq", - "chip name", "chip data", "domain name"); + seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq", + "chip name", (int)(2 * sizeof(void *) + 2), "chip data", + "domain name"); for (i = 1; i < nr_irqs; i++) { desc = irq_to_desc(i); @@ -666,7 +723,7 @@ static int virq_debug_show(struct seq_file *m, void *private) seq_printf(m, "%-15s ", p); data = irq_desc_get_chip_data(desc); - seq_printf(m, "0x%16p ", data); + seq_printf(m, data ? "0x%p " : " %p ", data); if (desc->irq_data.domain && desc->irq_data.domain->of_node) p = desc->irq_data.domain->of_node->full_name; @@ -704,8 +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; } |