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[karo-tx-linux.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  * @debugfs_file:       dentry for the debugfs file
50  * @name:               flow handler name for /proc/interrupts output
51  */
52 struct irq_desc {
53         struct irq_common_data  irq_common_data;
54         struct irq_data         irq_data;
55         unsigned int __percpu   *kstat_irqs;
56         irq_flow_handler_t      handle_irq;
57 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
58         irq_preflow_handler_t   preflow_handler;
59 #endif
60         struct irqaction        *action;        /* IRQ action list */
61         unsigned int            status_use_accessors;
62         unsigned int            core_internal_state__do_not_mess_with_it;
63         unsigned int            depth;          /* nested irq disables */
64         unsigned int            wake_depth;     /* nested wake enables */
65         unsigned int            irq_count;      /* For detecting broken IRQs */
66         unsigned long           last_unhandled; /* Aging timer for unhandled count */
67         unsigned int            irqs_unhandled;
68         atomic_t                threads_handled;
69         int                     threads_handled_last;
70         raw_spinlock_t          lock;
71         struct cpumask          *percpu_enabled;
72         const struct cpumask    *percpu_affinity;
73 #ifdef CONFIG_SMP
74         const struct cpumask    *affinity_hint;
75         struct irq_affinity_notify *affinity_notify;
76 #ifdef CONFIG_GENERIC_PENDING_IRQ
77         cpumask_var_t           pending_mask;
78 #endif
79 #endif
80         unsigned long           threads_oneshot;
81         atomic_t                threads_active;
82         wait_queue_head_t       wait_for_threads;
83 #ifdef CONFIG_PM_SLEEP
84         unsigned int            nr_actions;
85         unsigned int            no_suspend_depth;
86         unsigned int            cond_suspend_depth;
87         unsigned int            force_resume_depth;
88 #endif
89 #ifdef CONFIG_PROC_FS
90         struct proc_dir_entry   *dir;
91 #endif
92 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
93         struct dentry           *debugfs_file;
94 #endif
95 #ifdef CONFIG_SPARSE_IRQ
96         struct rcu_head         rcu;
97         struct kobject          kobj;
98 #endif
99         int                     parent_irq;
100         struct module           *owner;
101         const char              *name;
102 } ____cacheline_internodealigned_in_smp;
103
104 #ifdef CONFIG_SPARSE_IRQ
105 extern void irq_lock_sparse(void);
106 extern void irq_unlock_sparse(void);
107 #else
108 static inline void irq_lock_sparse(void) { }
109 static inline void irq_unlock_sparse(void) { }
110 extern struct irq_desc irq_desc[NR_IRQS];
111 #endif
112
113 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
114 {
115         return container_of(data->common, struct irq_desc, irq_common_data);
116 }
117
118 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
119 {
120         return desc->irq_data.irq;
121 }
122
123 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
124 {
125         return &desc->irq_data;
126 }
127
128 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
129 {
130         return desc->irq_data.chip;
131 }
132
133 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
134 {
135         return desc->irq_data.chip_data;
136 }
137
138 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
139 {
140         return desc->irq_common_data.handler_data;
141 }
142
143 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
144 {
145         return desc->irq_common_data.msi_desc;
146 }
147
148 /*
149  * Architectures call this to let the generic IRQ layer
150  * handle an interrupt.
151  */
152 static inline void generic_handle_irq_desc(struct irq_desc *desc)
153 {
154         desc->handle_irq(desc);
155 }
156
157 int generic_handle_irq(unsigned int irq);
158
159 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
160 /*
161  * Convert a HW interrupt number to a logical one using a IRQ domain,
162  * and handle the result interrupt number. Return -EINVAL if
163  * conversion failed. Providing a NULL domain indicates that the
164  * conversion has already been done.
165  */
166 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
167                         bool lookup, struct pt_regs *regs);
168
169 static inline int handle_domain_irq(struct irq_domain *domain,
170                                     unsigned int hwirq, struct pt_regs *regs)
171 {
172         return __handle_domain_irq(domain, hwirq, true, regs);
173 }
174 #endif
175
176 /* Test to see if a driver has successfully requested an irq */
177 static inline int irq_desc_has_action(struct irq_desc *desc)
178 {
179         return desc->action != NULL;
180 }
181
182 static inline int irq_has_action(unsigned int irq)
183 {
184         return irq_desc_has_action(irq_to_desc(irq));
185 }
186
187 /**
188  * irq_set_handler_locked - Set irq handler from a locked region
189  * @data:       Pointer to the irq_data structure which identifies the irq
190  * @handler:    Flow control handler function for this interrupt
191  *
192  * Sets the handler in the irq descriptor associated to @data.
193  *
194  * Must be called with irq_desc locked and valid parameters. Typical
195  * call site is the irq_set_type() callback.
196  */
197 static inline void irq_set_handler_locked(struct irq_data *data,
198                                           irq_flow_handler_t handler)
199 {
200         struct irq_desc *desc = irq_data_to_desc(data);
201
202         desc->handle_irq = handler;
203 }
204
205 /**
206  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
207  * @data:       Pointer to the irq_data structure for which the chip is set
208  * @chip:       Pointer to the new irq chip
209  * @handler:    Flow control handler function for this interrupt
210  * @name:       Name of the interrupt
211  *
212  * Replace the irq chip at the proper hierarchy level in @data and
213  * sets the handler and name in the associated irq descriptor.
214  *
215  * Must be called with irq_desc locked and valid parameters.
216  */
217 static inline void
218 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
219                                  irq_flow_handler_t handler, const char *name)
220 {
221         struct irq_desc *desc = irq_data_to_desc(data);
222
223         desc->handle_irq = handler;
224         desc->name = name;
225         data->chip = chip;
226 }
227
228 static inline int irq_balancing_disabled(unsigned int irq)
229 {
230         struct irq_desc *desc;
231
232         desc = irq_to_desc(irq);
233         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
234 }
235
236 static inline int irq_is_percpu(unsigned int irq)
237 {
238         struct irq_desc *desc;
239
240         desc = irq_to_desc(irq);
241         return desc->status_use_accessors & IRQ_PER_CPU;
242 }
243
244 static inline void
245 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
246 {
247         struct irq_desc *desc = irq_to_desc(irq);
248
249         if (desc)
250                 lockdep_set_class(&desc->lock, class);
251 }
252
253 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
254 static inline void
255 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
256 {
257         struct irq_desc *desc;
258
259         desc = irq_to_desc(irq);
260         desc->preflow_handler = handler;
261 }
262 #endif
263
264 #endif