1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
5 * Core internal functions to deal with irq descriptors
7 * This include will move to kernel/irq once we cleaned up the tree.
8 * For now it's included from <linux/irq.h>
11 struct irq_affinity_notify;
12 struct proc_dir_entry;
19 * struct irq_desc - interrupt descriptor
20 * @irq_data: per irq and chip data passed down to chip functions
21 * @kstat_irqs: irq stats per cpu
22 * @handle_irq: highlevel irq-events handler
23 * @preflow_handler: handler called before the flow handler (currently used by sparc)
24 * @action: the irq action chain
25 * @status: status information
26 * @core_internal_state__do_not_mess_with_it: core internal status information
27 * @depth: disable-depth, for nested irq_disable() calls
28 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
29 * @irq_count: stats field to detect stalled irqs
30 * @last_unhandled: aging timer for unhandled count
31 * @irqs_unhandled: stats field for spurious unhandled interrupts
32 * @threads_handled: stats field for deferred spurious detection of threaded handlers
33 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
34 * @lock: locking for SMP
35 * @affinity_hint: hint to user space for preferred irq affinity
36 * @affinity_notify: context for notification of affinity changes
37 * @pending_mask: pending rebalanced interrupts
38 * @threads_oneshot: bitfield to handle shared oneshot threads
39 * @threads_active: number of irqaction threads currently running
40 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
41 * @dir: /proc/irq/ procfs entry
42 * @name: flow handler name for /proc/interrupts output
45 struct irq_data irq_data;
46 unsigned int __percpu *kstat_irqs;
47 irq_flow_handler_t handle_irq;
48 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
49 irq_preflow_handler_t preflow_handler;
51 struct irqaction *action; /* IRQ action list */
52 unsigned int status_use_accessors;
53 unsigned int core_internal_state__do_not_mess_with_it;
54 unsigned int depth; /* nested irq disables */
55 unsigned int wake_depth; /* nested wake enables */
56 unsigned int irq_count; /* For detecting broken IRQs */
57 unsigned long last_unhandled; /* Aging timer for unhandled count */
58 unsigned int irqs_unhandled;
59 atomic_t threads_handled;
60 int threads_handled_last;
62 struct cpumask *percpu_enabled;
64 const struct cpumask *affinity_hint;
65 struct irq_affinity_notify *affinity_notify;
66 #ifdef CONFIG_GENERIC_PENDING_IRQ
67 cpumask_var_t pending_mask;
70 unsigned long threads_oneshot;
71 atomic_t threads_active;
72 wait_queue_head_t wait_for_threads;
74 struct proc_dir_entry *dir;
79 } ____cacheline_internodealigned_in_smp;
81 #ifndef CONFIG_SPARSE_IRQ
82 extern struct irq_desc irq_desc[NR_IRQS];
85 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
87 return &desc->irq_data;
90 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
92 return desc->irq_data.chip;
95 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
97 return desc->irq_data.chip_data;
100 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
102 return desc->irq_data.handler_data;
105 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
107 return desc->irq_data.msi_desc;
111 * Architectures call this to let the generic IRQ layer
112 * handle an interrupt. If the descriptor is attached to an
113 * irqchip-style controller then we call the ->handle_irq() handler,
114 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
116 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
118 desc->handle_irq(irq, desc);
121 int generic_handle_irq(unsigned int irq);
123 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
125 * Convert a HW interrupt number to a logical one using a IRQ domain,
126 * and handle the result interrupt number. Return -EINVAL if
127 * conversion failed. Providing a NULL domain indicates that the
128 * conversion has already been done.
130 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
131 bool lookup, struct pt_regs *regs);
133 static inline int handle_domain_irq(struct irq_domain *domain,
134 unsigned int hwirq, struct pt_regs *regs)
136 return __handle_domain_irq(domain, hwirq, true, regs);
140 /* Test to see if a driver has successfully requested an irq */
141 static inline int irq_has_action(unsigned int irq)
143 struct irq_desc *desc = irq_to_desc(irq);
144 return desc->action != NULL;
147 /* caller has locked the irq_desc and both params are valid */
148 static inline void __irq_set_handler_locked(unsigned int irq,
149 irq_flow_handler_t handler)
151 struct irq_desc *desc;
153 desc = irq_to_desc(irq);
154 desc->handle_irq = handler;
157 /* caller has locked the irq_desc and both params are valid */
159 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
160 irq_flow_handler_t handler, const char *name)
162 struct irq_desc *desc;
164 desc = irq_to_desc(irq);
165 irq_desc_get_irq_data(desc)->chip = chip;
166 desc->handle_irq = handler;
170 static inline int irq_balancing_disabled(unsigned int irq)
172 struct irq_desc *desc;
174 desc = irq_to_desc(irq);
175 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
178 static inline int irq_is_percpu(unsigned int irq)
180 struct irq_desc *desc;
182 desc = irq_to_desc(irq);
183 return desc->status_use_accessors & IRQ_PER_CPU;
187 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
189 struct irq_desc *desc = irq_to_desc(irq);
192 lockdep_set_class(&desc->lock, class);
195 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
197 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
199 struct irq_desc *desc;
201 desc = irq_to_desc(irq);
202 desc->preflow_handler = handler;