Merge tag 'for-linus-4.5-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[cascardo/linux.git] / include / linux / irqdesc.h
1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
3
4 #include <linux/rcupdate.h>
5
6 /*
7  * Core internal functions to deal with irq descriptors
8  */
9
10 struct irq_affinity_notify;
11 struct proc_dir_entry;
12 struct module;
13 struct irq_desc;
14 struct irq_domain;
15 struct pt_regs;
16
17 /**
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
42  *                      IRQF_NO_SUSPEND set
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
48  */
49 struct irq_desc {
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;
56 #endif
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;
67         raw_spinlock_t          lock;
68         struct cpumask          *percpu_enabled;
69 #ifdef CONFIG_SMP
70         const struct cpumask    *affinity_hint;
71         struct irq_affinity_notify *affinity_notify;
72 #ifdef CONFIG_GENERIC_PENDING_IRQ
73         cpumask_var_t           pending_mask;
74 #endif
75 #endif
76         unsigned long           threads_oneshot;
77         atomic_t                threads_active;
78         wait_queue_head_t       wait_for_threads;
79 #ifdef CONFIG_PM_SLEEP
80         unsigned int            nr_actions;
81         unsigned int            no_suspend_depth;
82         unsigned int            cond_suspend_depth;
83         unsigned int            force_resume_depth;
84 #endif
85 #ifdef CONFIG_PROC_FS
86         struct proc_dir_entry   *dir;
87 #endif
88 #ifdef CONFIG_SPARSE_IRQ
89         struct rcu_head         rcu;
90 #endif
91         int                     parent_irq;
92         struct module           *owner;
93         const char              *name;
94 } ____cacheline_internodealigned_in_smp;
95
96 #ifdef CONFIG_SPARSE_IRQ
97 extern void irq_lock_sparse(void);
98 extern void irq_unlock_sparse(void);
99 #else
100 static inline void irq_lock_sparse(void) { }
101 static inline void irq_unlock_sparse(void) { }
102 extern struct irq_desc irq_desc[NR_IRQS];
103 #endif
104
105 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
106 {
107         return container_of(data->common, struct irq_desc, irq_common_data);
108 }
109
110 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
111 {
112         return desc->irq_data.irq;
113 }
114
115 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
116 {
117         return &desc->irq_data;
118 }
119
120 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
121 {
122         return desc->irq_data.chip;
123 }
124
125 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
126 {
127         return desc->irq_data.chip_data;
128 }
129
130 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
131 {
132         return desc->irq_common_data.handler_data;
133 }
134
135 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
136 {
137         return desc->irq_common_data.msi_desc;
138 }
139
140 /*
141  * Architectures call this to let the generic IRQ layer
142  * handle an interrupt.
143  */
144 static inline void generic_handle_irq_desc(struct irq_desc *desc)
145 {
146         desc->handle_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 /**
180  * irq_set_handler_locked - Set irq handler from a locked region
181  * @data:       Pointer to the irq_data structure which identifies the irq
182  * @handler:    Flow control handler function for this interrupt
183  *
184  * Sets the handler in the irq descriptor associated to @data.
185  *
186  * Must be called with irq_desc locked and valid parameters. Typical
187  * call site is the irq_set_type() callback.
188  */
189 static inline void irq_set_handler_locked(struct irq_data *data,
190                                           irq_flow_handler_t handler)
191 {
192         struct irq_desc *desc = irq_data_to_desc(data);
193
194         desc->handle_irq = handler;
195 }
196
197 /**
198  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
199  * @data:       Pointer to the irq_data structure for which the chip is set
200  * @chip:       Pointer to the new irq chip
201  * @handler:    Flow control handler function for this interrupt
202  * @name:       Name of the interrupt
203  *
204  * Replace the irq chip at the proper hierarchy level in @data and
205  * sets the handler and name in the associated irq descriptor.
206  *
207  * Must be called with irq_desc locked and valid parameters.
208  */
209 static inline void
210 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
211                                  irq_flow_handler_t handler, const char *name)
212 {
213         struct irq_desc *desc = irq_data_to_desc(data);
214
215         desc->handle_irq = handler;
216         desc->name = name;
217         data->chip = chip;
218 }
219
220 static inline int irq_balancing_disabled(unsigned int irq)
221 {
222         struct irq_desc *desc;
223
224         desc = irq_to_desc(irq);
225         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
226 }
227
228 static inline int irq_is_percpu(unsigned int irq)
229 {
230         struct irq_desc *desc;
231
232         desc = irq_to_desc(irq);
233         return desc->status_use_accessors & IRQ_PER_CPU;
234 }
235
236 static inline void
237 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
238 {
239         struct irq_desc *desc = irq_to_desc(irq);
240
241         if (desc)
242                 lockdep_set_class(&desc->lock, class);
243 }
244
245 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
246 static inline void
247 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
248 {
249         struct irq_desc *desc;
250
251         desc = irq_to_desc(irq);
252         desc->preflow_handler = handler;
253 }
254 #endif
255
256 #endif