diff options
Diffstat (limited to 'include/linux/irqdesc.h')
| -rw-r--r-- | include/linux/irqdesc.h | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h new file mode 100644 index 000000000..dd1109fb2 --- /dev/null +++ b/include/linux/irqdesc.h @@ -0,0 +1,217 @@ +#ifndef _LINUX_IRQDESC_H +#define _LINUX_IRQDESC_H + +/* + * Core internal functions to deal with irq descriptors + * + * This include will move to kernel/irq once we cleaned up the tree. + * For now it's included from <linux/irq.h> + */ + +struct irq_affinity_notify; +struct proc_dir_entry; +struct module; +struct irq_desc; +struct irq_domain; +struct pt_regs; + +/** + * struct irq_desc - interrupt descriptor + * @irq_data: per irq and chip data passed down to chip functions + * @kstat_irqs: irq stats per cpu + * @handle_irq: highlevel irq-events handler + * @preflow_handler: handler called before the flow handler (currently used by sparc) + * @action: the irq action chain + * @status: status information + * @core_internal_state__do_not_mess_with_it: core internal status information + * @depth: disable-depth, for nested irq_disable() calls + * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers + * @irq_count: stats field to detect stalled irqs + * @last_unhandled: aging timer for unhandled count + * @irqs_unhandled: stats field for spurious unhandled interrupts + * @threads_handled: stats field for deferred spurious detection of threaded handlers + * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers + * @lock: locking for SMP + * @affinity_hint: hint to user space for preferred irq affinity + * @affinity_notify: context for notification of affinity changes + * @pending_mask: pending rebalanced interrupts + * @threads_oneshot: bitfield to handle shared oneshot threads + * @threads_active: number of irqaction threads currently running + * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers + * @nr_actions: number of installed actions on this descriptor + * @no_suspend_depth: number of irqactions on a irq descriptor with + * IRQF_NO_SUSPEND set + * @force_resume_depth: number of irqactions on a irq descriptor with + * IRQF_FORCE_RESUME set + * @dir: /proc/irq/ procfs entry + * @name: flow handler name for /proc/interrupts output + */ +struct irq_desc { + struct irq_data irq_data; + unsigned int __percpu *kstat_irqs; + irq_flow_handler_t handle_irq; +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI + irq_preflow_handler_t preflow_handler; +#endif + struct irqaction *action; /* IRQ action list */ + unsigned int status_use_accessors; + unsigned int core_internal_state__do_not_mess_with_it; + unsigned int depth; /* nested irq disables */ + unsigned int wake_depth; /* nested wake enables */ + unsigned int irq_count; /* For detecting broken IRQs */ + unsigned long last_unhandled; /* Aging timer for unhandled count */ + unsigned int irqs_unhandled; + atomic_t threads_handled; + int threads_handled_last; + raw_spinlock_t lock; + struct cpumask *percpu_enabled; +#ifdef CONFIG_SMP + const struct cpumask *affinity_hint; + struct irq_affinity_notify *affinity_notify; +#ifdef CONFIG_GENERIC_PENDING_IRQ + cpumask_var_t pending_mask; +#endif +#endif + unsigned long threads_oneshot; + atomic_t threads_active; + wait_queue_head_t wait_for_threads; +#ifdef CONFIG_PM_SLEEP + unsigned int nr_actions; + unsigned int no_suspend_depth; + unsigned int cond_suspend_depth; + unsigned int force_resume_depth; +#endif +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *dir; +#endif + int parent_irq; + struct module *owner; + const char *name; +} ____cacheline_internodealigned_in_smp; + +#ifndef CONFIG_SPARSE_IRQ +extern struct irq_desc irq_desc[NR_IRQS]; +#endif + +static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) +{ + return &desc->irq_data; +} + +static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) +{ + return desc->irq_data.chip; +} + +static inline void *irq_desc_get_chip_data(struct irq_desc *desc) +{ + return desc->irq_data.chip_data; +} + +static inline void *irq_desc_get_handler_data(struct irq_desc *desc) +{ + return desc->irq_data.handler_data; +} + +static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) +{ + return desc->irq_data.msi_desc; +} + +/* + * Architectures call this to let the generic IRQ layer + * handle an interrupt. If the descriptor is attached to an + * irqchip-style controller then we call the ->handle_irq() handler, + * and it calls __do_IRQ() if it's attached to an irqtype-style controller. + */ +static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) +{ + desc->handle_irq(irq, desc); +} + +int generic_handle_irq(unsigned int irq); + +#ifdef CONFIG_HANDLE_DOMAIN_IRQ +/* + * Convert a HW interrupt number to a logical one using a IRQ domain, + * and handle the result interrupt number. Return -EINVAL if + * conversion failed. Providing a NULL domain indicates that the + * conversion has already been done. + */ +int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, + bool lookup, struct pt_regs *regs); + +static inline int handle_domain_irq(struct irq_domain *domain, + unsigned int hwirq, struct pt_regs *regs) +{ + return __handle_domain_irq(domain, hwirq, true, regs); +} +#endif + +/* Test to see if a driver has successfully requested an irq */ +static inline int irq_has_action(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + return desc->action != NULL; +} + +/* caller has locked the irq_desc and both params are valid */ +static inline void __irq_set_handler_locked(unsigned int irq, + irq_flow_handler_t handler) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + desc->handle_irq = handler; +} + +/* caller has locked the irq_desc and both params are valid */ +static inline void +__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip, + irq_flow_handler_t handler, const char *name) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + irq_desc_get_irq_data(desc)->chip = chip; + desc->handle_irq = handler; + desc->name = name; +} + +static inline int irq_balancing_disabled(unsigned int irq) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; +} + +static inline int irq_is_percpu(unsigned int irq) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + return desc->status_use_accessors & IRQ_PER_CPU; +} + +static inline void +irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) +{ + struct irq_desc *desc = irq_to_desc(irq); + + if (desc) + lockdep_set_class(&desc->lock, class); +} + +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI +static inline void +__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) +{ + struct irq_desc *desc; + + desc = irq_to_desc(irq); + desc->preflow_handler = handler; +} +#endif + +#endif |