| /* 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 irqstat - interrupt statistics |
| * @cnt: real-time interrupt count |
| * @ref: snapshot of interrupt count |
| */ |
| struct irqstat { |
| unsigned int cnt; |
| #ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT |
| unsigned int ref; |
| #endif |
| }; |
| |
| /** |
| * 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; |
| struct irqstat __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; |
| #ifdef CONFIG_HARDIRQS_SW_RESEND |
| struct hlist_node resend_node; |
| #endif |
| } ____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(desc->kstat_irqs->cnt, 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 |