Merge tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[sfrench/cifs-2.6.git] / include / linux / irqdesc.h
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