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251 lines
7.7 KiB
251 lines
7.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_IRQDESC_H |
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#define _LINUX_IRQDESC_H |
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#include <linux/rcupdate.h> |
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#include <linux/kobject.h> |
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#include <linux/mutex.h> |
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/* |
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* Core internal functions to deal with irq descriptors |
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*/ |
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struct irq_affinity_notify; |
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struct proc_dir_entry; |
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struct module; |
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struct irq_desc; |
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struct irq_domain; |
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struct pt_regs; |
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/** |
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* struct irq_desc - interrupt descriptor |
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* @irq_common_data: per irq and chip data passed down to chip functions |
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* @kstat_irqs: irq stats per cpu |
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* @handle_irq: highlevel irq-events handler |
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* @action: the irq action chain |
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* @status_use_accessors: status information |
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* @core_internal_state__do_not_mess_with_it: core internal status information |
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* @depth: disable-depth, for nested irq_disable() calls |
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* @wake_depth: enable depth, for multiple irq_set_irq_wake() callers |
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* @tot_count: stats field for non-percpu irqs |
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* @irq_count: stats field to detect stalled irqs |
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* @last_unhandled: aging timer for unhandled count |
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* @irqs_unhandled: stats field for spurious unhandled interrupts |
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* @threads_handled: stats field for deferred spurious detection of threaded handlers |
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* @threads_handled_last: comparator field for deferred spurious detection of threaded handlers |
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* @lock: locking for SMP |
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* @affinity_hint: hint to user space for preferred irq affinity |
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* @affinity_notify: context for notification of affinity changes |
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* @pending_mask: pending rebalanced interrupts |
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* @threads_oneshot: bitfield to handle shared oneshot threads |
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* @threads_active: number of irqaction threads currently running |
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* @wait_for_threads: wait queue for sync_irq to wait for threaded handlers |
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* @nr_actions: number of installed actions on this descriptor |
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* @no_suspend_depth: number of irqactions on a irq descriptor with |
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* IRQF_NO_SUSPEND set |
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* @force_resume_depth: number of irqactions on a irq descriptor with |
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* IRQF_FORCE_RESUME set |
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* @rcu: rcu head for delayed free |
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* @kobj: kobject used to represent this struct in sysfs |
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* @request_mutex: mutex to protect request/free before locking desc->lock |
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* @dir: /proc/irq/ procfs entry |
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* @debugfs_file: dentry for the debugfs file |
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* @name: flow handler name for /proc/interrupts output |
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*/ |
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struct irq_desc { |
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struct irq_common_data irq_common_data; |
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struct irq_data irq_data; |
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unsigned int __percpu *kstat_irqs; |
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irq_flow_handler_t handle_irq; |
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struct irqaction *action; /* IRQ action list */ |
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unsigned int status_use_accessors; |
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unsigned int core_internal_state__do_not_mess_with_it; |
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unsigned int depth; /* nested irq disables */ |
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unsigned int wake_depth; /* nested wake enables */ |
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unsigned int tot_count; |
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unsigned int irq_count; /* For detecting broken IRQs */ |
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unsigned long last_unhandled; /* Aging timer for unhandled count */ |
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unsigned int irqs_unhandled; |
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atomic_t threads_handled; |
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int threads_handled_last; |
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raw_spinlock_t lock; |
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struct cpumask *percpu_enabled; |
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const struct cpumask *percpu_affinity; |
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#ifdef CONFIG_SMP |
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const struct cpumask *affinity_hint; |
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struct irq_affinity_notify *affinity_notify; |
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#ifdef CONFIG_GENERIC_PENDING_IRQ |
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cpumask_var_t pending_mask; |
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#endif |
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#endif |
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unsigned long threads_oneshot; |
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atomic_t threads_active; |
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wait_queue_head_t wait_for_threads; |
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#ifdef CONFIG_PM_SLEEP |
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unsigned int nr_actions; |
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unsigned int no_suspend_depth; |
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unsigned int cond_suspend_depth; |
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unsigned int force_resume_depth; |
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#endif |
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#ifdef CONFIG_PROC_FS |
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struct proc_dir_entry *dir; |
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#endif |
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#ifdef CONFIG_GENERIC_IRQ_DEBUGFS |
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struct dentry *debugfs_file; |
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const char *dev_name; |
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#endif |
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#ifdef CONFIG_SPARSE_IRQ |
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struct rcu_head rcu; |
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struct kobject kobj; |
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#endif |
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struct mutex request_mutex; |
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int parent_irq; |
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struct module *owner; |
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const char *name; |
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} ____cacheline_internodealigned_in_smp; |
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#ifdef CONFIG_SPARSE_IRQ |
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extern void irq_lock_sparse(void); |
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extern void irq_unlock_sparse(void); |
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#else |
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static inline void irq_lock_sparse(void) { } |
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static inline void irq_unlock_sparse(void) { } |
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extern struct irq_desc irq_desc[NR_IRQS]; |
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#endif |
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static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc, |
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unsigned int cpu) |
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{ |
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return desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, cpu) : 0; |
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} |
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static inline struct irq_desc *irq_data_to_desc(struct irq_data *data) |
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{ |
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return container_of(data->common, struct irq_desc, irq_common_data); |
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} |
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static inline unsigned int irq_desc_get_irq(struct irq_desc *desc) |
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{ |
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return desc->irq_data.irq; |
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} |
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static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) |
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{ |
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return &desc->irq_data; |
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} |
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static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) |
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{ |
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return desc->irq_data.chip; |
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} |
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static inline void *irq_desc_get_chip_data(struct irq_desc *desc) |
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{ |
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return desc->irq_data.chip_data; |
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} |
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static inline void *irq_desc_get_handler_data(struct irq_desc *desc) |
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{ |
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return desc->irq_common_data.handler_data; |
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} |
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/* |
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* Architectures call this to let the generic IRQ layer |
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* handle an interrupt. |
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*/ |
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static inline void generic_handle_irq_desc(struct irq_desc *desc) |
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{ |
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desc->handle_irq(desc); |
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} |
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int handle_irq_desc(struct irq_desc *desc); |
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int generic_handle_irq(unsigned int irq); |
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int generic_handle_irq_safe(unsigned int irq); |
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#ifdef CONFIG_IRQ_DOMAIN |
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/* |
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* Convert a HW interrupt number to a logical one using a IRQ domain, |
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* and handle the result interrupt number. Return -EINVAL if |
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* conversion failed. |
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*/ |
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int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq); |
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int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq); |
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int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq); |
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#endif |
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/* Test to see if a driver has successfully requested an irq */ |
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static inline int irq_desc_has_action(struct irq_desc *desc) |
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{ |
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return desc && desc->action != NULL; |
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} |
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/** |
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* irq_set_handler_locked - Set irq handler from a locked region |
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* @data: Pointer to the irq_data structure which identifies the irq |
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* @handler: Flow control handler function for this interrupt |
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* |
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* Sets the handler in the irq descriptor associated to @data. |
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* |
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* Must be called with irq_desc locked and valid parameters. Typical |
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* call site is the irq_set_type() callback. |
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*/ |
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static inline void irq_set_handler_locked(struct irq_data *data, |
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irq_flow_handler_t handler) |
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{ |
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struct irq_desc *desc = irq_data_to_desc(data); |
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desc->handle_irq = handler; |
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} |
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/** |
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* irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region |
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* @data: Pointer to the irq_data structure for which the chip is set |
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* @chip: Pointer to the new irq chip |
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* @handler: Flow control handler function for this interrupt |
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* @name: Name of the interrupt |
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* |
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* Replace the irq chip at the proper hierarchy level in @data and |
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* sets the handler and name in the associated irq descriptor. |
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* |
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* Must be called with irq_desc locked and valid parameters. |
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*/ |
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static inline void |
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irq_set_chip_handler_name_locked(struct irq_data *data, |
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const struct irq_chip *chip, |
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irq_flow_handler_t handler, const char *name) |
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{ |
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struct irq_desc *desc = irq_data_to_desc(data); |
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desc->handle_irq = handler; |
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desc->name = name; |
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data->chip = (struct irq_chip *)chip; |
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} |
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bool irq_check_status_bit(unsigned int irq, unsigned int bitmask); |
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static inline bool irq_balancing_disabled(unsigned int irq) |
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{ |
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return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK); |
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} |
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static inline bool irq_is_percpu(unsigned int irq) |
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{ |
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return irq_check_status_bit(irq, IRQ_PER_CPU); |
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} |
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static inline bool irq_is_percpu_devid(unsigned int irq) |
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{ |
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return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID); |
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} |
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void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class, |
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struct lock_class_key *request_class); |
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static inline void |
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irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class, |
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struct lock_class_key *request_class) |
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{ |
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if (IS_ENABLED(CONFIG_LOCKDEP)) |
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__irq_set_lockdep_class(irq, lock_class, request_class); |
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} |
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#endif
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