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1 | #ifndef _LINUX_IRQDESC_H | |
2 | #define _LINUX_IRQDESC_H | |
3 | ||
4 | #include <linux/rcupdate.h> | |
5 | #include <linux/kobject.h> | |
6 | #include <linux/mutex.h> | |
7 | ||
8 | /* | |
9 | * Core internal functions to deal with irq descriptors | |
10 | */ | |
11 | ||
12 | struct irq_affinity_notify; | |
13 | struct proc_dir_entry; | |
14 | struct module; | |
15 | struct irq_desc; | |
16 | struct irq_domain; | |
17 | struct pt_regs; | |
18 | ||
19 | /** | |
20 | * struct irq_desc - interrupt descriptor | |
21 | * @irq_common_data: per irq and chip data passed down to chip functions | |
22 | * @kstat_irqs: irq stats per cpu | |
23 | * @handle_irq: highlevel irq-events handler | |
24 | * @preflow_handler: handler called before the flow handler (currently used by sparc) | |
25 | * @action: the irq action chain | |
26 | * @status: status information | |
27 | * @core_internal_state__do_not_mess_with_it: core internal status information | |
28 | * @depth: disable-depth, for nested irq_disable() calls | |
29 | * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers | |
30 | * @irq_count: stats field to detect stalled irqs | |
31 | * @last_unhandled: aging timer for unhandled count | |
32 | * @irqs_unhandled: stats field for spurious unhandled interrupts | |
33 | * @threads_handled: stats field for deferred spurious detection of threaded handlers | |
34 | * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers | |
35 | * @lock: locking for SMP | |
36 | * @affinity_hint: hint to user space for preferred irq affinity | |
37 | * @affinity_notify: context for notification of affinity changes | |
38 | * @pending_mask: pending rebalanced interrupts | |
39 | * @threads_oneshot: bitfield to handle shared oneshot threads | |
40 | * @threads_active: number of irqaction threads currently running | |
41 | * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers | |
42 | * @nr_actions: number of installed actions on this descriptor | |
43 | * @no_suspend_depth: number of irqactions on a irq descriptor with | |
44 | * IRQF_NO_SUSPEND set | |
45 | * @force_resume_depth: number of irqactions on a irq descriptor with | |
46 | * IRQF_FORCE_RESUME set | |
47 | * @rcu: rcu head for delayed free | |
48 | * @kobj: kobject used to represent this struct in sysfs | |
49 | * @request_mutex: mutex to protect request/free before locking desc->lock | |
50 | * @dir: /proc/irq/ procfs entry | |
51 | * @debugfs_file: dentry for the debugfs file | |
52 | * @name: flow handler name for /proc/interrupts output | |
53 | */ | |
54 | struct irq_desc { | |
55 | struct irq_common_data irq_common_data; | |
56 | struct irq_data irq_data; | |
57 | unsigned int __percpu *kstat_irqs; | |
58 | irq_flow_handler_t handle_irq; | |
59 | #ifdef CONFIG_IRQ_PREFLOW_FASTEOI | |
60 | irq_preflow_handler_t preflow_handler; | |
61 | #endif | |
62 | struct irqaction *action; /* IRQ action list */ | |
63 | unsigned int status_use_accessors; | |
64 | unsigned int core_internal_state__do_not_mess_with_it; | |
65 | unsigned int depth; /* nested irq disables */ | |
66 | unsigned int wake_depth; /* nested wake enables */ | |
67 | unsigned int irq_count; /* For detecting broken IRQs */ | |
68 | unsigned long last_unhandled; /* Aging timer for unhandled count */ | |
69 | unsigned int irqs_unhandled; | |
70 | atomic_t threads_handled; | |
71 | int threads_handled_last; | |
72 | raw_spinlock_t lock; | |
73 | struct cpumask *percpu_enabled; | |
74 | const struct cpumask *percpu_affinity; | |
75 | #ifdef CONFIG_SMP | |
76 | const struct cpumask *affinity_hint; | |
77 | struct irq_affinity_notify *affinity_notify; | |
78 | #ifdef CONFIG_GENERIC_PENDING_IRQ | |
79 | cpumask_var_t pending_mask; | |
80 | #endif | |
81 | #endif | |
82 | unsigned long threads_oneshot; | |
83 | atomic_t threads_active; | |
84 | wait_queue_head_t wait_for_threads; | |
85 | #ifdef CONFIG_PM_SLEEP | |
86 | unsigned int nr_actions; | |
87 | unsigned int no_suspend_depth; | |
88 | unsigned int cond_suspend_depth; | |
89 | unsigned int force_resume_depth; | |
90 | #endif | |
91 | #ifdef CONFIG_PROC_FS | |
92 | struct proc_dir_entry *dir; | |
93 | #endif | |
94 | #ifdef CONFIG_GENERIC_IRQ_DEBUGFS | |
95 | struct dentry *debugfs_file; | |
96 | #endif | |
97 | #ifdef CONFIG_SPARSE_IRQ | |
98 | struct rcu_head rcu; | |
99 | struct kobject kobj; | |
100 | #endif | |
101 | struct mutex request_mutex; | |
102 | int parent_irq; | |
103 | struct module *owner; | |
104 | const char *name; | |
105 | } ____cacheline_internodealigned_in_smp; | |
106 | ||
107 | #ifdef CONFIG_SPARSE_IRQ | |
108 | extern void irq_lock_sparse(void); | |
109 | extern void irq_unlock_sparse(void); | |
110 | #else | |
111 | static inline void irq_lock_sparse(void) { } | |
112 | static inline void irq_unlock_sparse(void) { } | |
113 | extern struct irq_desc irq_desc[NR_IRQS]; | |
114 | #endif | |
115 | ||
116 | static inline struct irq_desc *irq_data_to_desc(struct irq_data *data) | |
117 | { | |
118 | return container_of(data->common, struct irq_desc, irq_common_data); | |
119 | } | |
120 | ||
121 | static inline unsigned int irq_desc_get_irq(struct irq_desc *desc) | |
122 | { | |
123 | return desc->irq_data.irq; | |
124 | } | |
125 | ||
126 | static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) | |
127 | { | |
128 | return &desc->irq_data; | |
129 | } | |
130 | ||
131 | static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) | |
132 | { | |
133 | return desc->irq_data.chip; | |
134 | } | |
135 | ||
136 | static inline void *irq_desc_get_chip_data(struct irq_desc *desc) | |
137 | { | |
138 | return desc->irq_data.chip_data; | |
139 | } | |
140 | ||
141 | static inline void *irq_desc_get_handler_data(struct irq_desc *desc) | |
142 | { | |
143 | return desc->irq_common_data.handler_data; | |
144 | } | |
145 | ||
146 | static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) | |
147 | { | |
148 | return desc->irq_common_data.msi_desc; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Architectures call this to let the generic IRQ layer | |
153 | * handle an interrupt. | |
154 | */ | |
155 | static inline void generic_handle_irq_desc(struct irq_desc *desc) | |
156 | { | |
157 | desc->handle_irq(desc); | |
158 | } | |
159 | ||
160 | int generic_handle_irq(unsigned int irq); | |
161 | ||
162 | #ifdef CONFIG_HANDLE_DOMAIN_IRQ | |
163 | /* | |
164 | * Convert a HW interrupt number to a logical one using a IRQ domain, | |
165 | * and handle the result interrupt number. Return -EINVAL if | |
166 | * conversion failed. Providing a NULL domain indicates that the | |
167 | * conversion has already been done. | |
168 | */ | |
169 | int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, | |
170 | bool lookup, struct pt_regs *regs); | |
171 | ||
172 | static inline int handle_domain_irq(struct irq_domain *domain, | |
173 | unsigned int hwirq, struct pt_regs *regs) | |
174 | { | |
175 | return __handle_domain_irq(domain, hwirq, true, regs); | |
176 | } | |
177 | #endif | |
178 | ||
179 | /* Test to see if a driver has successfully requested an irq */ | |
180 | static inline int irq_desc_has_action(struct irq_desc *desc) | |
181 | { | |
182 | return desc->action != NULL; | |
183 | } | |
184 | ||
185 | static inline int irq_has_action(unsigned int irq) | |
186 | { | |
187 | return irq_desc_has_action(irq_to_desc(irq)); | |
188 | } | |
189 | ||
190 | /** | |
191 | * irq_set_handler_locked - Set irq handler from a locked region | |
192 | * @data: Pointer to the irq_data structure which identifies the irq | |
193 | * @handler: Flow control handler function for this interrupt | |
194 | * | |
195 | * Sets the handler in the irq descriptor associated to @data. | |
196 | * | |
197 | * Must be called with irq_desc locked and valid parameters. Typical | |
198 | * call site is the irq_set_type() callback. | |
199 | */ | |
200 | static inline void irq_set_handler_locked(struct irq_data *data, | |
201 | irq_flow_handler_t handler) | |
202 | { | |
203 | struct irq_desc *desc = irq_data_to_desc(data); | |
204 | ||
205 | desc->handle_irq = handler; | |
206 | } | |
207 | ||
208 | /** | |
209 | * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region | |
210 | * @data: Pointer to the irq_data structure for which the chip is set | |
211 | * @chip: Pointer to the new irq chip | |
212 | * @handler: Flow control handler function for this interrupt | |
213 | * @name: Name of the interrupt | |
214 | * | |
215 | * Replace the irq chip at the proper hierarchy level in @data and | |
216 | * sets the handler and name in the associated irq descriptor. | |
217 | * | |
218 | * Must be called with irq_desc locked and valid parameters. | |
219 | */ | |
220 | static inline void | |
221 | irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip, | |
222 | irq_flow_handler_t handler, const char *name) | |
223 | { | |
224 | struct irq_desc *desc = irq_data_to_desc(data); | |
225 | ||
226 | desc->handle_irq = handler; | |
227 | desc->name = name; | |
228 | data->chip = chip; | |
229 | } | |
230 | ||
231 | static inline int irq_balancing_disabled(unsigned int irq) | |
232 | { | |
233 | struct irq_desc *desc; | |
234 | ||
235 | desc = irq_to_desc(irq); | |
236 | return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; | |
237 | } | |
238 | ||
239 | static inline int irq_is_percpu(unsigned int irq) | |
240 | { | |
241 | struct irq_desc *desc; | |
242 | ||
243 | desc = irq_to_desc(irq); | |
244 | return desc->status_use_accessors & IRQ_PER_CPU; | |
245 | } | |
246 | ||
247 | static inline void | |
248 | irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) | |
249 | { | |
250 | struct irq_desc *desc = irq_to_desc(irq); | |
251 | ||
252 | if (desc) | |
253 | lockdep_set_class(&desc->lock, class); | |
254 | } | |
255 | ||
256 | #ifdef CONFIG_IRQ_PREFLOW_FASTEOI | |
257 | static inline void | |
258 | __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) | |
259 | { | |
260 | struct irq_desc *desc; | |
261 | ||
262 | desc = irq_to_desc(irq); | |
263 | desc->preflow_handler = handler; | |
264 | } | |
265 | #endif | |
266 | ||
267 | #endif |