Merge tag 'sunxi-fixes-for-4.3' of https://git.kernel.org/pub/scm/linux/kernel/git...
[linux-drm-fsl-dcu.git] / include / linux / irqdesc.h
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         return container_of(data->common, struct irq_desc, irq_common_data);
102 }
103
104 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
105 {
106         return desc->irq_data.irq;
107 }
108
109 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
110 {
111         return &desc->irq_data;
112 }
113
114 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
115 {
116         return desc->irq_data.chip;
117 }
118
119 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
120 {
121         return desc->irq_data.chip_data;
122 }
123
124 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
125 {
126         return desc->irq_common_data.handler_data;
127 }
128
129 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
130 {
131         return desc->irq_common_data.msi_desc;
132 }
133
134 /*
135  * Architectures call this to let the generic IRQ layer
136  * handle an interrupt.
137  */
138 static inline void generic_handle_irq_desc(struct irq_desc *desc)
139 {
140         desc->handle_irq(desc);
141 }
142
143 int generic_handle_irq(unsigned int irq);
144
145 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
146 /*
147  * Convert a HW interrupt number to a logical one using a IRQ domain,
148  * and handle the result interrupt number. Return -EINVAL if
149  * conversion failed. Providing a NULL domain indicates that the
150  * conversion has already been done.
151  */
152 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
153                         bool lookup, struct pt_regs *regs);
154
155 static inline int handle_domain_irq(struct irq_domain *domain,
156                                     unsigned int hwirq, struct pt_regs *regs)
157 {
158         return __handle_domain_irq(domain, hwirq, true, regs);
159 }
160 #endif
161
162 /* Test to see if a driver has successfully requested an irq */
163 static inline int irq_desc_has_action(struct irq_desc *desc)
164 {
165         return desc->action != NULL;
166 }
167
168 static inline int irq_has_action(unsigned int irq)
169 {
170         return irq_desc_has_action(irq_to_desc(irq));
171 }
172
173 /**
174  * irq_set_handler_locked - Set irq handler from a locked region
175  * @data:       Pointer to the irq_data structure which identifies the irq
176  * @handler:    Flow control handler function for this interrupt
177  *
178  * Sets the handler in the irq descriptor associated to @data.
179  *
180  * Must be called with irq_desc locked and valid parameters. Typical
181  * call site is the irq_set_type() callback.
182  */
183 static inline void irq_set_handler_locked(struct irq_data *data,
184                                           irq_flow_handler_t handler)
185 {
186         struct irq_desc *desc = irq_data_to_desc(data);
187
188         desc->handle_irq = handler;
189 }
190
191 /**
192  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
193  * @data:       Pointer to the irq_data structure for which the chip is set
194  * @chip:       Pointer to the new irq chip
195  * @handler:    Flow control handler function for this interrupt
196  * @name:       Name of the interrupt
197  *
198  * Replace the irq chip at the proper hierarchy level in @data and
199  * sets the handler and name in the associated irq descriptor.
200  *
201  * Must be called with irq_desc locked and valid parameters.
202  */
203 static inline void
204 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
205                                  irq_flow_handler_t handler, const char *name)
206 {
207         struct irq_desc *desc = irq_data_to_desc(data);
208
209         desc->handle_irq = handler;
210         desc->name = name;
211         data->chip = chip;
212 }
213
214 static inline int irq_balancing_disabled(unsigned int irq)
215 {
216         struct irq_desc *desc;
217
218         desc = irq_to_desc(irq);
219         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
220 }
221
222 static inline int irq_is_percpu(unsigned int irq)
223 {
224         struct irq_desc *desc;
225
226         desc = irq_to_desc(irq);
227         return desc->status_use_accessors & IRQ_PER_CPU;
228 }
229
230 static inline void
231 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
232 {
233         struct irq_desc *desc = irq_to_desc(irq);
234
235         if (desc)
236                 lockdep_set_class(&desc->lock, class);
237 }
238
239 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
240 static inline void
241 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
242 {
243         struct irq_desc *desc;
244
245         desc = irq_to_desc(irq);
246         desc->preflow_handler = handler;
247 }
248 #endif
249
250 #endif