1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
4 #include <linux/rcupdate.h>
5 #include <linux/kobject.h>
8 * Core internal functions to deal with irq descriptors
11 struct irq_affinity_notify;
12 struct proc_dir_entry;
19 * struct irq_desc - interrupt descriptor
20 * @irq_common_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 * @nr_actions: number of installed actions on this descriptor
42 * @no_suspend_depth: number of irqactions on a irq descriptor with
44 * @force_resume_depth: number of irqactions on a irq descriptor with
45 * IRQF_FORCE_RESUME set
46 * @rcu: rcu head for delayed free
47 * @kobj: kobject used to represent this struct in sysfs
48 * @dir: /proc/irq/ procfs entry
49 * @name: flow handler name for /proc/interrupts output
52 struct irq_common_data irq_common_data;
53 struct irq_data irq_data;
54 unsigned int __percpu *kstat_irqs;
55 irq_flow_handler_t handle_irq;
56 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
57 irq_preflow_handler_t preflow_handler;
59 struct irqaction *action; /* IRQ action list */
60 unsigned int status_use_accessors;
61 unsigned int core_internal_state__do_not_mess_with_it;
62 unsigned int depth; /* nested irq disables */
63 unsigned int wake_depth; /* nested wake enables */
64 unsigned int tot_count;
65 unsigned int irq_count; /* For detecting broken IRQs */
66 unsigned long last_unhandled; /* Aging timer for unhandled count */
67 unsigned int irqs_unhandled;
68 atomic_t threads_handled;
69 int threads_handled_last;
71 struct cpumask *percpu_enabled;
72 const struct cpumask *percpu_affinity;
74 const struct cpumask *affinity_hint;
75 struct irq_affinity_notify *affinity_notify;
76 #ifdef CONFIG_GENERIC_PENDING_IRQ
77 cpumask_var_t pending_mask;
80 unsigned long threads_oneshot;
81 atomic_t threads_active;
82 wait_queue_head_t wait_for_threads;
83 #ifdef CONFIG_PM_SLEEP
84 unsigned int nr_actions;
85 unsigned int no_suspend_depth;
86 unsigned int cond_suspend_depth;
87 unsigned int force_resume_depth;
90 struct proc_dir_entry *dir;
92 #ifdef CONFIG_SPARSE_IRQ
99 } ____cacheline_internodealigned_in_smp;
101 #ifdef CONFIG_SPARSE_IRQ
102 extern void irq_lock_sparse(void);
103 extern void irq_unlock_sparse(void);
105 static inline void irq_lock_sparse(void) { }
106 static inline void irq_unlock_sparse(void) { }
107 extern struct irq_desc irq_desc[NR_IRQS];
110 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
112 return container_of(data->common, struct irq_desc, irq_common_data);
115 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
117 return desc->irq_data.irq;
120 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
122 return &desc->irq_data;
125 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
127 return desc->irq_data.chip;
130 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
132 return desc->irq_data.chip_data;
135 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
137 return desc->irq_common_data.handler_data;
140 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
142 return desc->irq_common_data.msi_desc;
146 * Architectures call this to let the generic IRQ layer
147 * handle an interrupt.
149 static inline void generic_handle_irq_desc(struct irq_desc *desc)
151 desc->handle_irq(desc);
154 int generic_handle_irq(unsigned int irq);
156 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
158 * Convert a HW interrupt number to a logical one using a IRQ domain,
159 * and handle the result interrupt number. Return -EINVAL if
160 * conversion failed. Providing a NULL domain indicates that the
161 * conversion has already been done.
163 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
164 bool lookup, struct pt_regs *regs);
166 static inline int handle_domain_irq(struct irq_domain *domain,
167 unsigned int hwirq, struct pt_regs *regs)
169 return __handle_domain_irq(domain, hwirq, true, regs);
173 /* Test to see if a driver has successfully requested an irq */
174 static inline int irq_desc_has_action(struct irq_desc *desc)
176 return desc->action != NULL;
179 static inline int irq_has_action(unsigned int irq)
181 return irq_desc_has_action(irq_to_desc(irq));
185 * irq_set_handler_locked - Set irq handler from a locked region
186 * @data: Pointer to the irq_data structure which identifies the irq
187 * @handler: Flow control handler function for this interrupt
189 * Sets the handler in the irq descriptor associated to @data.
191 * Must be called with irq_desc locked and valid parameters. Typical
192 * call site is the irq_set_type() callback.
194 static inline void irq_set_handler_locked(struct irq_data *data,
195 irq_flow_handler_t handler)
197 struct irq_desc *desc = irq_data_to_desc(data);
199 desc->handle_irq = handler;
203 * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
204 * @data: Pointer to the irq_data structure for which the chip is set
205 * @chip: Pointer to the new irq chip
206 * @handler: Flow control handler function for this interrupt
207 * @name: Name of the interrupt
209 * Replace the irq chip at the proper hierarchy level in @data and
210 * sets the handler and name in the associated irq descriptor.
212 * Must be called with irq_desc locked and valid parameters.
215 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
216 irq_flow_handler_t handler, const char *name)
218 struct irq_desc *desc = irq_data_to_desc(data);
220 desc->handle_irq = handler;
225 static inline int irq_balancing_disabled(unsigned int irq)
227 struct irq_desc *desc;
229 desc = irq_to_desc(irq);
230 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
233 static inline int irq_is_percpu(unsigned int irq)
235 struct irq_desc *desc;
237 desc = irq_to_desc(irq);
238 return desc->status_use_accessors & IRQ_PER_CPU;
242 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
244 struct irq_desc *desc = irq_to_desc(irq);
247 lockdep_set_class(&desc->lock, class);
250 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
252 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
254 struct irq_desc *desc;
256 desc = irq_to_desc(irq);
257 desc->preflow_handler = handler;