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1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
3
4 /*
5  * Core internal functions to deal with irq descriptors
6  */
7
8 struct irq_affinity_notify;
9 struct proc_dir_entry;
10 struct module;
11 struct irq_desc;
12 struct irq_domain;
13 struct pt_regs;
14
15 /**
16  * struct irq_desc - interrupt descriptor
17  * @irq_common_data:    per irq and chip data passed down to chip functions
18  * @kstat_irqs:         irq stats per cpu
19  * @handle_irq:         highlevel irq-events handler
20  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
21  * @action:             the irq action chain
22  * @status:             status information
23  * @core_internal_state__do_not_mess_with_it: core internal status information
24  * @depth:              disable-depth, for nested irq_disable() calls
25  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
26  * @irq_count:          stats field to detect stalled irqs
27  * @last_unhandled:     aging timer for unhandled count
28  * @irqs_unhandled:     stats field for spurious unhandled interrupts
29  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
30  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
31  * @lock:               locking for SMP
32  * @affinity_hint:      hint to user space for preferred irq affinity
33  * @affinity_notify:    context for notification of affinity changes
34  * @pending_mask:       pending rebalanced interrupts
35  * @threads_oneshot:    bitfield to handle shared oneshot threads
36  * @threads_active:     number of irqaction threads currently running
37  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
38  * @nr_actions:         number of installed actions on this descriptor
39  * @no_suspend_depth:   number of irqactions on a irq descriptor with
40  *                      IRQF_NO_SUSPEND set
41  * @force_resume_depth: number of irqactions on a irq descriptor with
42  *                      IRQF_FORCE_RESUME set
43  * @dir:                /proc/irq/ procfs entry
44  * @name:               flow handler name for /proc/interrupts output
45  */
46 struct irq_desc {
47         struct irq_common_data  irq_common_data;
48         struct irq_data         irq_data;
49         unsigned int __percpu   *kstat_irqs;
50         irq_flow_handler_t      handle_irq;
51 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
52         irq_preflow_handler_t   preflow_handler;
53 #endif
54         struct irqaction        *action;        /* IRQ action list */
55         unsigned int            status_use_accessors;
56         unsigned int            core_internal_state__do_not_mess_with_it;
57         unsigned int            depth;          /* nested irq disables */
58         unsigned int            wake_depth;     /* nested wake enables */
59         unsigned int            irq_count;      /* For detecting broken IRQs */
60         unsigned long           last_unhandled; /* Aging timer for unhandled count */
61         unsigned int            irqs_unhandled;
62         atomic_t                threads_handled;
63         int                     threads_handled_last;
64         raw_spinlock_t          lock;
65         struct cpumask          *percpu_enabled;
66 #ifdef CONFIG_SMP
67         const struct cpumask    *affinity_hint;
68         struct irq_affinity_notify *affinity_notify;
69 #ifdef CONFIG_GENERIC_PENDING_IRQ
70         cpumask_var_t           pending_mask;
71 #endif
72 #endif
73         unsigned long           threads_oneshot;
74         atomic_t                threads_active;
75         wait_queue_head_t       wait_for_threads;
76 #ifdef CONFIG_PM_SLEEP
77         unsigned int            nr_actions;
78         unsigned int            no_suspend_depth;
79         unsigned int            cond_suspend_depth;
80         unsigned int            force_resume_depth;
81 #endif
82 #ifdef CONFIG_PROC_FS
83         struct proc_dir_entry   *dir;
84 #endif
85         int                     parent_irq;
86         struct module           *owner;
87         const char              *name;
88 } ____cacheline_internodealigned_in_smp;
89
90 #ifdef CONFIG_SPARSE_IRQ
91 extern void irq_lock_sparse(void);
92 extern void irq_unlock_sparse(void);
93 #else
94 static inline void irq_lock_sparse(void) { }
95 static inline void irq_unlock_sparse(void) { }
96 extern struct irq_desc irq_desc[NR_IRQS];
97 #endif
98
99 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
100 {
101 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
102         return irq_to_desc(data->irq);
103 #else
104         return container_of(data, struct irq_desc, irq_data);
105 #endif
106 }
107
108 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
109 {
110         return desc->irq_data.irq;
111 }
112
113 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
114 {
115         return &desc->irq_data;
116 }
117
118 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
119 {
120         return desc->irq_data.chip;
121 }
122
123 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
124 {
125         return desc->irq_data.chip_data;
126 }
127
128 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
129 {
130         return desc->irq_data.handler_data;
131 }
132
133 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
134 {
135         return desc->irq_data.msi_desc;
136 }
137
138 /*
139  * Architectures call this to let the generic IRQ layer
140  * handle an interrupt. If the descriptor is attached to an
141  * irqchip-style controller then we call the ->handle_irq() handler,
142  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
143  */
144 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
145 {
146         desc->handle_irq(irq, desc);
147 }
148
149 int generic_handle_irq(unsigned int irq);
150
151 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
152 /*
153  * Convert a HW interrupt number to a logical one using a IRQ domain,
154  * and handle the result interrupt number. Return -EINVAL if
155  * conversion failed. Providing a NULL domain indicates that the
156  * conversion has already been done.
157  */
158 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
159                         bool lookup, struct pt_regs *regs);
160
161 static inline int handle_domain_irq(struct irq_domain *domain,
162                                     unsigned int hwirq, struct pt_regs *regs)
163 {
164         return __handle_domain_irq(domain, hwirq, true, regs);
165 }
166 #endif
167
168 /* Test to see if a driver has successfully requested an irq */
169 static inline int irq_desc_has_action(struct irq_desc *desc)
170 {
171         return desc->action != NULL;
172 }
173
174 static inline int irq_has_action(unsigned int irq)
175 {
176         return irq_desc_has_action(irq_to_desc(irq));
177 }
178
179 /* caller has locked the irq_desc and both params are valid */
180 static inline void __irq_set_handler_locked(unsigned int irq,
181                                             irq_flow_handler_t handler)
182 {
183         struct irq_desc *desc;
184
185         desc = irq_to_desc(irq);
186         desc->handle_irq = handler;
187 }
188
189 /* caller has locked the irq_desc and both params are valid */
190 static inline void
191 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
192                                    irq_flow_handler_t handler, const char *name)
193 {
194         struct irq_desc *desc;
195
196         desc = irq_to_desc(irq);
197         irq_desc_get_irq_data(desc)->chip = chip;
198         desc->handle_irq = handler;
199         desc->name = name;
200 }
201
202 /**
203  * irq_set_handler_locked - Set irq handler from a locked region
204  * @data:       Pointer to the irq_data structure which identifies the irq
205  * @handler:    Flow control handler function for this interrupt
206  *
207  * Sets the handler in the irq descriptor associated to @data.
208  *
209  * Must be called with irq_desc locked and valid parameters. Typical
210  * call site is the irq_set_type() callback.
211  */
212 static inline void irq_set_handler_locked(struct irq_data *data,
213                                           irq_flow_handler_t handler)
214 {
215         struct irq_desc *desc = irq_data_to_desc(data);
216
217         desc->handle_irq = handler;
218 }
219
220 /**
221  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
222  * @data:       Pointer to the irq_data structure for which the chip is set
223  * @chip:       Pointer to the new irq chip
224  * @handler:    Flow control handler function for this interrupt
225  * @name:       Name of the interrupt
226  *
227  * Replace the irq chip at the proper hierarchy level in @data and
228  * sets the handler and name in the associated irq descriptor.
229  *
230  * Must be called with irq_desc locked and valid parameters.
231  */
232 static inline void
233 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
234                                  irq_flow_handler_t handler, const char *name)
235 {
236         struct irq_desc *desc = irq_data_to_desc(data);
237
238         desc->handle_irq = handler;
239         desc->name = name;
240         data->chip = chip;
241 }
242
243 static inline int irq_balancing_disabled(unsigned int irq)
244 {
245         struct irq_desc *desc;
246
247         desc = irq_to_desc(irq);
248         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
249 }
250
251 static inline int irq_is_percpu(unsigned int irq)
252 {
253         struct irq_desc *desc;
254
255         desc = irq_to_desc(irq);
256         return desc->status_use_accessors & IRQ_PER_CPU;
257 }
258
259 static inline void
260 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
261 {
262         struct irq_desc *desc = irq_to_desc(irq);
263
264         if (desc)
265                 lockdep_set_class(&desc->lock, class);
266 }
267
268 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
269 static inline void
270 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
271 {
272         struct irq_desc *desc;
273
274         desc = irq_to_desc(irq);
275         desc->preflow_handler = handler;
276 }
277 #endif
278
279 #endif