1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
4 #include <linux/rcupdate.h>
7 * Core internal functions to deal with irq descriptors
10 struct irq_affinity_notify;
11 struct proc_dir_entry;
18 * struct irq_desc - interrupt descriptor
19 * @irq_common_data: per irq and chip data passed down to chip functions
20 * @kstat_irqs: irq stats per cpu
21 * @handle_irq: highlevel irq-events handler
22 * @preflow_handler: handler called before the flow handler (currently used by sparc)
23 * @action: the irq action chain
24 * @status: status information
25 * @core_internal_state__do_not_mess_with_it: core internal status information
26 * @depth: disable-depth, for nested irq_disable() calls
27 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers
28 * @irq_count: stats field to detect stalled irqs
29 * @last_unhandled: aging timer for unhandled count
30 * @irqs_unhandled: stats field for spurious unhandled interrupts
31 * @threads_handled: stats field for deferred spurious detection of threaded handlers
32 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
33 * @lock: locking for SMP
34 * @affinity_hint: hint to user space for preferred irq affinity
35 * @affinity_notify: context for notification of affinity changes
36 * @pending_mask: pending rebalanced interrupts
37 * @threads_oneshot: bitfield to handle shared oneshot threads
38 * @threads_active: number of irqaction threads currently running
39 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
40 * @nr_actions: number of installed actions on this descriptor
41 * @no_suspend_depth: number of irqactions on a irq descriptor with
43 * @force_resume_depth: number of irqactions on a irq descriptor with
44 * IRQF_FORCE_RESUME set
45 * @rcu: rcu head for delayed free
46 * @dir: /proc/irq/ procfs entry
47 * @name: flow handler name for /proc/interrupts output
50 struct irq_common_data irq_common_data;
51 struct irq_data irq_data;
52 unsigned int __percpu *kstat_irqs;
53 irq_flow_handler_t handle_irq;
54 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
55 irq_preflow_handler_t preflow_handler;
57 struct irqaction *action; /* IRQ action list */
58 unsigned int status_use_accessors;
59 unsigned int core_internal_state__do_not_mess_with_it;
60 unsigned int depth; /* nested irq disables */
61 unsigned int wake_depth; /* nested wake enables */
62 unsigned int irq_count; /* For detecting broken IRQs */
63 unsigned long last_unhandled; /* Aging timer for unhandled count */
64 unsigned int irqs_unhandled;
65 atomic_t threads_handled;
66 int threads_handled_last;
68 struct cpumask *percpu_enabled;
69 const struct cpumask *percpu_affinity;
71 const struct cpumask *affinity_hint;
72 struct irq_affinity_notify *affinity_notify;
73 #ifdef CONFIG_GENERIC_PENDING_IRQ
74 cpumask_var_t pending_mask;
77 unsigned long threads_oneshot;
78 atomic_t threads_active;
79 wait_queue_head_t wait_for_threads;
80 #ifdef CONFIG_PM_SLEEP
81 unsigned int nr_actions;
82 unsigned int no_suspend_depth;
83 unsigned int cond_suspend_depth;
84 unsigned int force_resume_depth;
87 struct proc_dir_entry *dir;
89 #ifdef CONFIG_SPARSE_IRQ
95 } ____cacheline_internodealigned_in_smp;
97 #ifdef CONFIG_SPARSE_IRQ
98 extern void irq_lock_sparse(void);
99 extern void irq_unlock_sparse(void);
101 static inline void irq_lock_sparse(void) { }
102 static inline void irq_unlock_sparse(void) { }
103 extern struct irq_desc irq_desc[NR_IRQS];
106 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
108 return container_of(data->common, struct irq_desc, irq_common_data);
111 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
113 return desc->irq_data.irq;
116 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
118 return &desc->irq_data;
121 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
123 return desc->irq_data.chip;
126 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
128 return desc->irq_data.chip_data;
131 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
133 return desc->irq_common_data.handler_data;
136 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
138 return desc->irq_common_data.msi_desc;
142 * Architectures call this to let the generic IRQ layer
143 * handle an interrupt.
145 static inline void generic_handle_irq_desc(struct irq_desc *desc)
147 desc->handle_irq(desc);
150 int generic_handle_irq(unsigned int irq);
152 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
154 * Convert a HW interrupt number to a logical one using a IRQ domain,
155 * and handle the result interrupt number. Return -EINVAL if
156 * conversion failed. Providing a NULL domain indicates that the
157 * conversion has already been done.
159 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
160 bool lookup, struct pt_regs *regs);
162 static inline int handle_domain_irq(struct irq_domain *domain,
163 unsigned int hwirq, struct pt_regs *regs)
165 return __handle_domain_irq(domain, hwirq, true, regs);
169 /* Test to see if a driver has successfully requested an irq */
170 static inline int irq_desc_has_action(struct irq_desc *desc)
172 return desc->action != NULL;
175 static inline int irq_has_action(unsigned int irq)
177 return irq_desc_has_action(irq_to_desc(irq));
181 * irq_set_handler_locked - Set irq handler from a locked region
182 * @data: Pointer to the irq_data structure which identifies the irq
183 * @handler: Flow control handler function for this interrupt
185 * Sets the handler in the irq descriptor associated to @data.
187 * Must be called with irq_desc locked and valid parameters. Typical
188 * call site is the irq_set_type() callback.
190 static inline void irq_set_handler_locked(struct irq_data *data,
191 irq_flow_handler_t handler)
193 struct irq_desc *desc = irq_data_to_desc(data);
195 desc->handle_irq = handler;
199 * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
200 * @data: Pointer to the irq_data structure for which the chip is set
201 * @chip: Pointer to the new irq chip
202 * @handler: Flow control handler function for this interrupt
203 * @name: Name of the interrupt
205 * Replace the irq chip at the proper hierarchy level in @data and
206 * sets the handler and name in the associated irq descriptor.
208 * Must be called with irq_desc locked and valid parameters.
211 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
212 irq_flow_handler_t handler, const char *name)
214 struct irq_desc *desc = irq_data_to_desc(data);
216 desc->handle_irq = handler;
221 static inline int irq_balancing_disabled(unsigned int irq)
223 struct irq_desc *desc;
225 desc = irq_to_desc(irq);
226 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
229 static inline int irq_is_percpu(unsigned int irq)
231 struct irq_desc *desc;
233 desc = irq_to_desc(irq);
234 return desc->status_use_accessors & IRQ_PER_CPU;
238 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
240 struct irq_desc *desc = irq_to_desc(irq);
243 lockdep_set_class(&desc->lock, class);
246 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
248 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
250 struct irq_desc *desc;
252 desc = irq_to_desc(irq);
253 desc->preflow_handler = handler;