diff options
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/Kconfig | 5 | ||||
| -rw-r--r-- | kernel/irq/irqdesc.c | 73 | ||||
| -rw-r--r-- | kernel/irq/irqdomain.c | 120 |
3 files changed, 129 insertions, 69 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index d79ef2493a28..fbc54c2a7f23 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -70,6 +70,11 @@ config IRQ_DOMAIN_HIERARCHY bool select IRQ_DOMAIN +# Support for obsolete non-mapping irq domains +config IRQ_DOMAIN_NOMAP + bool + select IRQ_DOMAIN + # Support for hierarchical fasteoi+edge and fasteoi+level handlers config IRQ_FASTEOI_HIERARCHY_HANDLERS bool diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 4a617d7312a4..f4dd5186858a 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -632,14 +632,8 @@ void irq_init_desc(unsigned int irq) #endif /* !CONFIG_SPARSE_IRQ */ -/** - * generic_handle_irq - Invoke the handler for a particular irq - * @irq: The irq number to handle - * - */ -int generic_handle_irq(unsigned int irq) +int handle_irq_desc(struct irq_desc *desc) { - struct irq_desc *desc = irq_to_desc(irq); struct irq_data *data; if (!desc) @@ -652,11 +646,40 @@ int generic_handle_irq(unsigned int irq) generic_handle_irq_desc(desc); return 0; } +EXPORT_SYMBOL_GPL(handle_irq_desc); + +/** + * generic_handle_irq - Invoke the handler for a particular irq + * @irq: The irq number to handle + * + */ +int generic_handle_irq(unsigned int irq) +{ + return handle_irq_desc(irq_to_desc(irq)); +} EXPORT_SYMBOL_GPL(generic_handle_irq); +#ifdef CONFIG_IRQ_DOMAIN +/** + * generic_handle_domain_irq - Invoke the handler for a HW irq belonging + * to a domain, usually for a non-root interrupt + * controller + * @domain: The domain where to perform the lookup + * @hwirq: The HW irq number to convert to a logical one + * + * Returns: 0 on success, or -EINVAL if conversion has failed + * + */ +int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq) +{ + return handle_irq_desc(irq_resolve_mapping(domain, hwirq)); +} +EXPORT_SYMBOL_GPL(generic_handle_domain_irq); + #ifdef CONFIG_HANDLE_DOMAIN_IRQ /** - * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain + * handle_domain_irq - Invoke the handler for a HW irq belonging to a domain, + * usually for a root interrupt controller * @domain: The domain where to perform the lookup * @hwirq: The HW irq number to convert to a logical one * @lookup: Whether to perform the domain lookup or not @@ -664,37 +687,27 @@ EXPORT_SYMBOL_GPL(generic_handle_irq); * * Returns: 0 on success, or -EINVAL if conversion has failed */ -int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, - bool lookup, struct pt_regs *regs) +int handle_domain_irq(struct irq_domain *domain, + unsigned int hwirq, struct pt_regs *regs) { struct pt_regs *old_regs = set_irq_regs(regs); - unsigned int irq = hwirq; + struct irq_desc *desc; int ret = 0; irq_enter(); -#ifdef CONFIG_IRQ_DOMAIN - if (lookup) - irq = irq_find_mapping(domain, hwirq); -#endif - - /* - * Some hardware gives randomly wrong interrupts. Rather - * than crashing, do something sensible. - */ - if (unlikely(!irq || irq >= nr_irqs)) { - ack_bad_irq(irq); + /* The irqdomain code provides boundary checks */ + desc = irq_resolve_mapping(domain, hwirq); + if (likely(desc)) + handle_irq_desc(desc); + else ret = -EINVAL; - } else { - generic_handle_irq(irq); - } irq_exit(); set_irq_regs(old_regs); return ret; } -#ifdef CONFIG_IRQ_DOMAIN /** * handle_domain_nmi - Invoke the handler for a HW irq belonging to a domain * @domain: The domain where to perform the lookup @@ -709,7 +722,7 @@ int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq, struct pt_regs *regs) { struct pt_regs *old_regs = set_irq_regs(regs); - unsigned int irq; + struct irq_desc *desc; int ret = 0; /* @@ -717,14 +730,14 @@ int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq, */ WARN_ON(!in_nmi()); - irq = irq_find_mapping(domain, hwirq); + desc = irq_resolve_mapping(domain, hwirq); /* * ack_bad_irq is not NMI-safe, just report * an invalid interrupt. */ - if (likely(irq)) - generic_handle_irq(irq); + if (likely(desc)) + handle_irq_desc(desc); else ret = -EINVAL; diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 6284443b87ec..51c483ce2447 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -146,7 +146,11 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, static atomic_t unknown_domains; - domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size), + if (WARN_ON((size && direct_max) || + (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max))) + return NULL; + + domain = kzalloc_node(struct_size(domain, revmap, size), GFP_KERNEL, of_node_to_nid(to_of_node(fwnode))); if (!domain) return NULL; @@ -209,12 +213,18 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size, /* Fill structure */ INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL); - mutex_init(&domain->revmap_tree_mutex); + mutex_init(&domain->revmap_mutex); domain->ops = ops; domain->host_data = host_data; domain->hwirq_max = hwirq_max; + + if (direct_max) { + size = direct_max; + domain->flags |= IRQ_DOMAIN_FLAG_NO_MAP; + } + domain->revmap_size = size; - domain->revmap_direct_max_irq = direct_max; + irq_domain_check_hierarchy(domain); mutex_lock(&irq_domain_mutex); @@ -482,29 +492,39 @@ struct irq_domain *irq_get_default_host(void) return irq_default_domain; } +static bool irq_domain_is_nomap(struct irq_domain *domain) +{ + return IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && + (domain->flags & IRQ_DOMAIN_FLAG_NO_MAP); +} + static void irq_domain_clear_mapping(struct irq_domain *domain, irq_hw_number_t hwirq) { - if (hwirq < domain->revmap_size) { - domain->linear_revmap[hwirq] = 0; - } else { - mutex_lock(&domain->revmap_tree_mutex); + if (irq_domain_is_nomap(domain)) + return; + + mutex_lock(&domain->revmap_mutex); + if (hwirq < domain->revmap_size) + rcu_assign_pointer(domain->revmap[hwirq], NULL); + else radix_tree_delete(&domain->revmap_tree, hwirq); - mutex_unlock(&domain->revmap_tree_mutex); - } + mutex_unlock(&domain->revmap_mutex); } static void irq_domain_set_mapping(struct irq_domain *domain, irq_hw_number_t hwirq, struct irq_data *irq_data) { - if (hwirq < domain->revmap_size) { - domain->linear_revmap[hwirq] = irq_data->irq; - } else { - mutex_lock(&domain->revmap_tree_mutex); + if (irq_domain_is_nomap(domain)) + return; + + mutex_lock(&domain->revmap_mutex); + if (hwirq < domain->revmap_size) + rcu_assign_pointer(domain->revmap[hwirq], irq_data); + else radix_tree_insert(&domain->revmap_tree, hwirq, irq_data); - mutex_unlock(&domain->revmap_tree_mutex); - } + mutex_unlock(&domain->revmap_mutex); } static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) @@ -604,6 +624,7 @@ void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, } EXPORT_SYMBOL_GPL(irq_domain_associate_many); +#ifdef CONFIG_IRQ_DOMAIN_NOMAP /** * irq_create_direct_mapping() - Allocate an irq for direct mapping * @domain: domain to allocate the irq for or NULL for default domain @@ -628,9 +649,9 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) pr_debug("create_direct virq allocation failed\n"); return 0; } - if (virq >= domain->revmap_direct_max_irq) { + if (virq >= domain->revmap_size) { pr_err("ERROR: no free irqs available below %i maximum\n", - domain->revmap_direct_max_irq); + domain->revmap_size); irq_free_desc(virq); return 0; } @@ -644,6 +665,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) return virq; } EXPORT_SYMBOL_GPL(irq_create_direct_mapping); +#endif /** * irq_create_mapping_affinity() - Map a hardware interrupt into linux irq space @@ -862,37 +884,53 @@ void irq_dispose_mapping(unsigned int virq) EXPORT_SYMBOL_GPL(irq_dispose_mapping); /** - * irq_find_mapping() - Find a linux irq from a hw irq number. + * __irq_resolve_mapping() - Find a linux irq from a hw irq number. * @domain: domain owning this hardware interrupt * @hwirq: hardware irq number in that domain space + * @irq: optional pointer to return the Linux irq if required + * + * Returns the interrupt descriptor. */ -unsigned int irq_find_mapping(struct irq_domain *domain, - irq_hw_number_t hwirq) +struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain, + irq_hw_number_t hwirq, + unsigned int *irq) { + struct irq_desc *desc = NULL; struct irq_data *data; /* Look for default domain if necessary */ if (domain == NULL) domain = irq_default_domain; if (domain == NULL) - return 0; + return desc; + + if (irq_domain_is_nomap(domain)) { + if (hwirq < domain->revmap_size) { + data = irq_domain_get_irq_data(domain, hwirq); + if (data && data->hwirq == hwirq) + desc = irq_data_to_desc(data); + } - if (hwirq < domain->revmap_direct_max_irq) { - data = irq_domain_get_irq_data(domain, hwirq); - if (data && data->hwirq == hwirq) - return hwirq; + return desc; } + rcu_read_lock(); /* Check if the hwirq is in the linear revmap. */ if (hwirq < domain->revmap_size) - return domain->linear_revmap[hwirq]; + data = rcu_dereference(domain->revmap[hwirq]); + else + data = radix_tree_lookup(&domain->revmap_tree, hwirq); + + if (likely(data)) { + desc = irq_data_to_desc(data); + if (irq) + *irq = data->irq; + } - rcu_read_lock(); - data = radix_tree_lookup(&domain->revmap_tree, hwirq); rcu_read_unlock(); - return data ? data->irq : 0; + return desc; } -EXPORT_SYMBOL_GPL(irq_find_mapping); +EXPORT_SYMBOL_GPL(__irq_resolve_mapping); /** * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings @@ -1468,15 +1506,20 @@ static void irq_domain_fix_revmap(struct irq_data *d) { void __rcu **slot; - if (d->hwirq < d->domain->revmap_size) - return; /* Not using radix tree. */ + if (irq_domain_is_nomap(d->domain)) + return; /* Fix up the revmap. */ - mutex_lock(&d->domain->revmap_tree_mutex); - slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq); - if (slot) - radix_tree_replace_slot(&d->domain->revmap_tree, slot, d); - mutex_unlock(&d->domain->revmap_tree_mutex); + mutex_lock(&d->domain->revmap_mutex); + if (d->hwirq < d->domain->revmap_size) { + /* Not using radix tree */ + rcu_assign_pointer(d->domain->revmap[d->hwirq], d); + } else { + slot = radix_tree_lookup_slot(&d->domain->revmap_tree, d->hwirq); + if (slot) + radix_tree_replace_slot(&d->domain->revmap_tree, slot, d); + } + mutex_unlock(&d->domain->revmap_mutex); } /** @@ -1828,8 +1871,7 @@ static void irq_domain_debug_show_one(struct seq_file *m, struct irq_domain *d, int ind) { seq_printf(m, "%*sname: %s\n", ind, "", d->name); - seq_printf(m, "%*ssize: %u\n", ind + 1, "", - d->revmap_size + d->revmap_direct_max_irq); + seq_printf(m, "%*ssize: %u\n", ind + 1, "", d->revmap_size); seq_printf(m, "%*smapped: %u\n", ind + 1, "", d->mapcount); seq_printf(m, "%*sflags: 0x%08x\n", ind +1 , "", d->flags); if (d->ops && d->ops->debug_show) |