diff options
Diffstat (limited to 'include/linux/irqdesc.h')
| -rw-r--r-- | include/linux/irqdesc.h | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h new file mode 100644 index 000000000..844a8e30e --- /dev/null +++ b/include/linux/irqdesc.h @@ -0,0 +1,251 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_IRQDESC_H +#define _LINUX_IRQDESC_H + +#include <linux/rcupdate.h> +#include <linux/kobject.h> +#include <linux/mutex.h> + +/* + * Core internal functions to deal with irq descriptors + */ + +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_common_data: per irq and chip data passed down to chip functions + * @kstat_irqs: irq stats per cpu + * @handle_irq: highlevel irq-events handler + * @action: the irq action chain + * @status_use_accessors: 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 + * @tot_count: stats field for non-percpu irqs + * @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 threaded 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 + * @rcu: rcu head for delayed free + * @kobj: kobject used to represent this struct in sysfs + * @request_mutex: mutex to protect request/free before locking desc->lock + * @dir: /proc/irq/ procfs entry + * @debugfs_file: dentry for the debugfs file + * @name: flow handler name for /proc/interrupts output + */ +struct irq_desc { + struct irq_common_data irq_common_data; + struct irq_data irq_data; + unsigned int __percpu *kstat_irqs; + irq_flow_handler_t handle_irq; + 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 tot_count; + 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; + const struct cpumask *percpu_affinity; +#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 +#ifdef CONFIG_GENERIC_IRQ_DEBUGFS + struct dentry *debugfs_file; + const char *dev_name; +#endif +#ifdef CONFIG_SPARSE_IRQ + struct rcu_head rcu; + struct kobject kobj; +#endif + struct mutex request_mutex; + int parent_irq; + struct module *owner; + const char *name; +} ____cacheline_internodealigned_in_smp; + +#ifdef CONFIG_SPARSE_IRQ +extern void irq_lock_sparse(void); +extern void irq_unlock_sparse(void); +#else +static inline void irq_lock_sparse(void) { } +static inline void irq_unlock_sparse(void) { } +extern struct irq_desc irq_desc[NR_IRQS]; +#endif + +static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc, + unsigned int cpu) +{ + return desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, cpu) : 0; +} + +static inline struct irq_desc *irq_data_to_desc(struct irq_data *data) +{ + return container_of(data->common, struct irq_desc, irq_common_data); +} + +static inline unsigned int irq_desc_get_irq(struct irq_desc *desc) +{ + return desc->irq_data.irq; +} + +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_common_data.handler_data; +} + +/* + * Architectures call this to let the generic IRQ layer + * handle an interrupt. + */ +static inline void generic_handle_irq_desc(struct irq_desc *desc) +{ + desc->handle_irq(desc); +} + +int handle_irq_desc(struct irq_desc *desc); +int generic_handle_irq(unsigned int irq); +int generic_handle_irq_safe(unsigned int irq); + +#ifdef CONFIG_IRQ_DOMAIN +/* + * Convert a HW interrupt number to a logical one using a IRQ domain, + * and handle the result interrupt number. Return -EINVAL if + * conversion failed. + */ +int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq); +int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq); +int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq); +#endif + +/* Test to see if a driver has successfully requested an irq */ +static inline int irq_desc_has_action(struct irq_desc *desc) +{ + return desc && desc->action != NULL; +} + +/** + * irq_set_handler_locked - Set irq handler from a locked region + * @data: Pointer to the irq_data structure which identifies the irq + * @handler: Flow control handler function for this interrupt + * + * Sets the handler in the irq descriptor associated to @data. + * + * Must be called with irq_desc locked and valid parameters. Typical + * call site is the irq_set_type() callback. + */ +static inline void irq_set_handler_locked(struct irq_data *data, + irq_flow_handler_t handler) +{ + struct irq_desc *desc = irq_data_to_desc(data); + + desc->handle_irq = handler; +} + +/** + * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region + * @data: Pointer to the irq_data structure for which the chip is set + * @chip: Pointer to the new irq chip + * @handler: Flow control handler function for this interrupt + * @name: Name of the interrupt + * + * Replace the irq chip at the proper hierarchy level in @data and + * sets the handler and name in the associated irq descriptor. + * + * Must be called with irq_desc locked and valid parameters. + */ +static inline void +irq_set_chip_handler_name_locked(struct irq_data *data, + const struct irq_chip *chip, + irq_flow_handler_t handler, const char *name) +{ + struct irq_desc *desc = irq_data_to_desc(data); + + desc->handle_irq = handler; + desc->name = name; + data->chip = (struct irq_chip *)chip; +} + +bool irq_check_status_bit(unsigned int irq, unsigned int bitmask); + +static inline bool irq_balancing_disabled(unsigned int irq) +{ + return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK); +} + +static inline bool irq_is_percpu(unsigned int irq) +{ + return irq_check_status_bit(irq, IRQ_PER_CPU); +} + +static inline bool irq_is_percpu_devid(unsigned int irq) +{ + return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID); +} + +void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class, + struct lock_class_key *request_class); +static inline void +irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class, + struct lock_class_key *request_class) +{ + if (IS_ENABLED(CONFIG_LOCKDEP)) + __irq_set_lockdep_class(irq, lock_class, request_class); +} + +#endif |