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