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;
13 struct timer_rand_state;
15 * struct irq_desc - interrupt descriptor
16 * @irq_data: per irq and chip data passed down to chip functions
17 * @timer_rand_state: pointer to timer rand state struct
18 * @kstat_irqs: irq stats per cpu
19 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
20 * @action: the irq action chain
21 * @status: status information
22 * @core_internal_state__do_not_mess_with_it: core internal status information
23 * @depth: disable-depth, for nested irq_disable() calls
24 * @wake_depth: enable depth, for multiple set_irq_wake() callers
25 * @irq_count: stats field to detect stalled irqs
26 * @last_unhandled: aging timer for unhandled count
27 * @irqs_unhandled: stats field for spurious unhandled interrupts
28 * @lock: locking for SMP
29 * @affinity_notify: context for notification of affinity changes
30 * @pending_mask: pending rebalanced interrupts
31 * @threads_oneshot: bitfield to handle shared oneshot threads
32 * @threads_active: number of irqaction threads currently running
33 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers
34 * @dir: /proc/irq/ procfs entry
35 * @name: flow handler name for /proc/interrupts output
39 #ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
40 struct irq_data irq_data;
43 * This union will go away, once we fixed the direct access to
44 * irq_desc all over the place. The direct fields are a 1:1
45 * overlay of irq_data.
48 struct irq_data irq_data;
52 unsigned int pad_do_not_even_think_about_it;
53 struct irq_chip *chip;
56 struct msi_desc *msi_desc;
58 cpumask_var_t affinity;
64 struct timer_rand_state *timer_rand_state;
65 unsigned int __percpu *kstat_irqs;
66 irq_flow_handler_t handle_irq;
67 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
68 irq_preflow_handler_t preflow_handler;
70 struct irqaction *action; /* IRQ action list */
71 #ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
72 unsigned int status_use_accessors;
74 unsigned int status; /* IRQ status */
76 unsigned int core_internal_state__do_not_mess_with_it;
77 unsigned int depth; /* nested irq disables */
78 unsigned int wake_depth; /* nested wake enables */
79 unsigned int irq_count; /* For detecting broken IRQs */
80 unsigned long last_unhandled; /* Aging timer for unhandled count */
81 unsigned int irqs_unhandled;
84 const struct cpumask *affinity_hint;
85 struct irq_affinity_notify *affinity_notify;
86 #ifdef CONFIG_GENERIC_PENDING_IRQ
87 cpumask_var_t pending_mask;
90 unsigned long threads_oneshot;
91 atomic_t threads_active;
92 wait_queue_head_t wait_for_threads;
94 struct proc_dir_entry *dir;
97 } ____cacheline_internodealigned_in_smp;
99 #ifndef CONFIG_SPARSE_IRQ
100 extern struct irq_desc irq_desc[NR_IRQS];
103 #ifdef CONFIG_GENERIC_HARDIRQS
105 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
107 return &desc->irq_data;
110 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
112 return desc->irq_data.chip;
115 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
117 return desc->irq_data.chip_data;
120 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
122 return desc->irq_data.handler_data;
125 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
127 return desc->irq_data.msi_desc;
130 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
131 static inline struct irq_chip *get_irq_desc_chip(struct irq_desc *desc)
133 return irq_desc_get_chip(desc);
135 static inline void *get_irq_desc_data(struct irq_desc *desc)
137 return irq_desc_get_handler_data(desc);
140 static inline void *get_irq_desc_chip_data(struct irq_desc *desc)
142 return irq_desc_get_chip_data(desc);
145 static inline struct msi_desc *get_irq_desc_msi(struct irq_desc *desc)
147 return irq_desc_get_msi_desc(desc);
152 * Architectures call this to let the generic IRQ layer
153 * handle an interrupt. If the descriptor is attached to an
154 * irqchip-style controller then we call the ->handle_irq() handler,
155 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
157 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
159 desc->handle_irq(irq, desc);
162 static inline void generic_handle_irq(unsigned int irq)
164 generic_handle_irq_desc(irq, irq_to_desc(irq));
167 /* Test to see if a driver has successfully requested an irq */
168 static inline int irq_has_action(unsigned int irq)
170 struct irq_desc *desc = irq_to_desc(irq);
171 return desc->action != NULL;
174 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
175 static inline int irq_balancing_disabled(unsigned int irq)
177 struct irq_desc *desc;
179 desc = irq_to_desc(irq);
180 return desc->status & IRQ_NO_BALANCING_MASK;
184 /* caller has locked the irq_desc and both params are valid */
185 static inline void __set_irq_handler_unlocked(int irq,
186 irq_flow_handler_t handler)
188 struct irq_desc *desc;
190 desc = irq_to_desc(irq);
191 desc->handle_irq = handler;
194 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
196 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
198 struct irq_desc *desc;
200 desc = irq_to_desc(irq);
201 desc->preflow_handler = handler;