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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
7 /*
8 * Core internal functions to deal with irq descriptors
9 */
10
11 struct irq_affinity_notify;
12 struct proc_dir_entry;
13 struct module;
14 struct irq_desc;
15 struct irq_domain;
16 struct pt_regs;
17
18 /**
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
43 * IRQF_NO_SUSPEND set
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
50 */
51 struct irq_desc {
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;
58 #endif
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 irq_count; /* For detecting broken IRQs */
65 unsigned long last_unhandled; /* Aging timer for unhandled count */
66 unsigned int irqs_unhandled;
67 atomic_t threads_handled;
68 int threads_handled_last;
69 raw_spinlock_t lock;
70 struct cpumask *percpu_enabled;
71 const struct cpumask *percpu_affinity;
72 #ifdef CONFIG_SMP
73 const struct cpumask *affinity_hint;
74 struct irq_affinity_notify *affinity_notify;
75 #ifdef CONFIG_GENERIC_PENDING_IRQ
76 cpumask_var_t pending_mask;
77 #endif
78 #endif
79 unsigned long threads_oneshot;
80 atomic_t threads_active;
81 wait_queue_head_t wait_for_threads;
82 #ifdef CONFIG_PM_SLEEP
83 unsigned int nr_actions;
84 unsigned int no_suspend_depth;
85 unsigned int cond_suspend_depth;
86 unsigned int force_resume_depth;
87 #endif
88 #ifdef CONFIG_PROC_FS
89 struct proc_dir_entry *dir;
90 #endif
91 #ifdef CONFIG_SPARSE_IRQ
92 struct rcu_head rcu;
93 struct kobject kobj;
94 #endif
95 int parent_irq;
96 struct module *owner;
97 const char *name;
98 } ____cacheline_internodealigned_in_smp;
99
100 #ifdef CONFIG_SPARSE_IRQ
101 extern void irq_lock_sparse(void);
102 extern void irq_unlock_sparse(void);
103 #else
104 static inline void irq_lock_sparse(void) { }
105 static inline void irq_unlock_sparse(void) { }
106 extern struct irq_desc irq_desc[NR_IRQS];
107 #endif
108
109 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
110 {
111 return container_of(data->common, struct irq_desc, irq_common_data);
112 }
113
114 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
115 {
116 return desc->irq_data.irq;
117 }
118
119 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
120 {
121 return &desc->irq_data;
122 }
123
124 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
125 {
126 return desc->irq_data.chip;
127 }
128
129 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
130 {
131 return desc->irq_data.chip_data;
132 }
133
134 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
135 {
136 return desc->irq_common_data.handler_data;
137 }
138
139 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
140 {
141 return desc->irq_common_data.msi_desc;
142 }
143
144 /*
145 * Architectures call this to let the generic IRQ layer
146 * handle an interrupt.
147 */
148 static inline void generic_handle_irq_desc(struct irq_desc *desc)
149 {
150 desc->handle_irq(desc);
151 }
152
153 int generic_handle_irq(unsigned int irq);
154
155 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
156 /*
157 * Convert a HW interrupt number to a logical one using a IRQ domain,
158 * and handle the result interrupt number. Return -EINVAL if
159 * conversion failed. Providing a NULL domain indicates that the
160 * conversion has already been done.
161 */
162 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
163 bool lookup, struct pt_regs *regs);
164
165 static inline int handle_domain_irq(struct irq_domain *domain,
166 unsigned int hwirq, struct pt_regs *regs)
167 {
168 return __handle_domain_irq(domain, hwirq, true, regs);
169 }
170 #endif
171
172 /* Test to see if a driver has successfully requested an irq */
173 static inline int irq_desc_has_action(struct irq_desc *desc)
174 {
175 return desc->action != NULL;
176 }
177
178 static inline int irq_has_action(unsigned int irq)
179 {
180 return irq_desc_has_action(irq_to_desc(irq));
181 }
182
183 /**
184 * irq_set_handler_locked - Set irq handler from a locked region
185 * @data: Pointer to the irq_data structure which identifies the irq
186 * @handler: Flow control handler function for this interrupt
187 *
188 * Sets the handler in the irq descriptor associated to @data.
189 *
190 * Must be called with irq_desc locked and valid parameters. Typical
191 * call site is the irq_set_type() callback.
192 */
193 static inline void irq_set_handler_locked(struct irq_data *data,
194 irq_flow_handler_t handler)
195 {
196 struct irq_desc *desc = irq_data_to_desc(data);
197
198 desc->handle_irq = handler;
199 }
200
201 /**
202 * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
203 * @data: Pointer to the irq_data structure for which the chip is set
204 * @chip: Pointer to the new irq chip
205 * @handler: Flow control handler function for this interrupt
206 * @name: Name of the interrupt
207 *
208 * Replace the irq chip at the proper hierarchy level in @data and
209 * sets the handler and name in the associated irq descriptor.
210 *
211 * Must be called with irq_desc locked and valid parameters.
212 */
213 static inline void
214 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
215 irq_flow_handler_t handler, const char *name)
216 {
217 struct irq_desc *desc = irq_data_to_desc(data);
218
219 desc->handle_irq = handler;
220 desc->name = name;
221 data->chip = chip;
222 }
223
224 static inline int irq_balancing_disabled(unsigned int irq)
225 {
226 struct irq_desc *desc;
227
228 desc = irq_to_desc(irq);
229 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
230 }
231
232 static inline int irq_is_percpu(unsigned int irq)
233 {
234 struct irq_desc *desc;
235
236 desc = irq_to_desc(irq);
237 return desc->status_use_accessors & IRQ_PER_CPU;
238 }
239
240 static inline void
241 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
242 {
243 struct irq_desc *desc = irq_to_desc(irq);
244
245 if (desc)
246 lockdep_set_class(&desc->lock, class);
247 }
248
249 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
250 static inline void
251 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
252 {
253 struct irq_desc *desc;
254
255 desc = irq_to_desc(irq);
256 desc->preflow_handler = handler;
257 }
258 #endif
259
260 #endif