These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / 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         u64                     random_ip;
65         raw_spinlock_t          lock;
66         struct cpumask          *percpu_enabled;
67 #ifdef CONFIG_SMP
68         const struct cpumask    *affinity_hint;
69         struct irq_affinity_notify *affinity_notify;
70 #ifdef CONFIG_GENERIC_PENDING_IRQ
71         cpumask_var_t           pending_mask;
72 #endif
73 #endif
74         unsigned long           threads_oneshot;
75         atomic_t                threads_active;
76         wait_queue_head_t       wait_for_threads;
77 #ifdef CONFIG_PM_SLEEP
78         unsigned int            nr_actions;
79         unsigned int            no_suspend_depth;
80         unsigned int            cond_suspend_depth;
81         unsigned int            force_resume_depth;
82 #endif
83 #ifdef CONFIG_PROC_FS
84         struct proc_dir_entry   *dir;
85 #endif
86         int                     parent_irq;
87         struct module           *owner;
88         const char              *name;
89 } ____cacheline_internodealigned_in_smp;
90
91 #ifdef CONFIG_SPARSE_IRQ
92 extern void irq_lock_sparse(void);
93 extern void irq_unlock_sparse(void);
94 #else
95 static inline void irq_lock_sparse(void) { }
96 static inline void irq_unlock_sparse(void) { }
97 extern struct irq_desc irq_desc[NR_IRQS];
98 #endif
99
100 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
101 {
102         return container_of(data->common, struct irq_desc, irq_common_data);
103 }
104
105 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
106 {
107         return desc->irq_data.irq;
108 }
109
110 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
111 {
112         return &desc->irq_data;
113 }
114
115 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
116 {
117         return desc->irq_data.chip;
118 }
119
120 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
121 {
122         return desc->irq_data.chip_data;
123 }
124
125 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
126 {
127         return desc->irq_common_data.handler_data;
128 }
129
130 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
131 {
132         return desc->irq_common_data.msi_desc;
133 }
134
135 /*
136  * Architectures call this to let the generic IRQ layer
137  * handle an interrupt.
138  */
139 static inline void generic_handle_irq_desc(struct irq_desc *desc)
140 {
141         desc->handle_irq(desc);
142 }
143
144 int generic_handle_irq(unsigned int irq);
145
146 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
147 /*
148  * Convert a HW interrupt number to a logical one using a IRQ domain,
149  * and handle the result interrupt number. Return -EINVAL if
150  * conversion failed. Providing a NULL domain indicates that the
151  * conversion has already been done.
152  */
153 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
154                         bool lookup, struct pt_regs *regs);
155
156 static inline int handle_domain_irq(struct irq_domain *domain,
157                                     unsigned int hwirq, struct pt_regs *regs)
158 {
159         return __handle_domain_irq(domain, hwirq, true, regs);
160 }
161 #endif
162
163 /* Test to see if a driver has successfully requested an irq */
164 static inline int irq_desc_has_action(struct irq_desc *desc)
165 {
166         return desc->action != NULL;
167 }
168
169 static inline int irq_has_action(unsigned int irq)
170 {
171         return irq_desc_has_action(irq_to_desc(irq));
172 }
173
174 /**
175  * irq_set_handler_locked - Set irq handler from a locked region
176  * @data:       Pointer to the irq_data structure which identifies the irq
177  * @handler:    Flow control handler function for this interrupt
178  *
179  * Sets the handler in the irq descriptor associated to @data.
180  *
181  * Must be called with irq_desc locked and valid parameters. Typical
182  * call site is the irq_set_type() callback.
183  */
184 static inline void irq_set_handler_locked(struct irq_data *data,
185                                           irq_flow_handler_t handler)
186 {
187         struct irq_desc *desc = irq_data_to_desc(data);
188
189         desc->handle_irq = handler;
190 }
191
192 /**
193  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
194  * @data:       Pointer to the irq_data structure for which the chip is set
195  * @chip:       Pointer to the new irq chip
196  * @handler:    Flow control handler function for this interrupt
197  * @name:       Name of the interrupt
198  *
199  * Replace the irq chip at the proper hierarchy level in @data and
200  * sets the handler and name in the associated irq descriptor.
201  *
202  * Must be called with irq_desc locked and valid parameters.
203  */
204 static inline void
205 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
206                                  irq_flow_handler_t handler, const char *name)
207 {
208         struct irq_desc *desc = irq_data_to_desc(data);
209
210         desc->handle_irq = handler;
211         desc->name = name;
212         data->chip = chip;
213 }
214
215 static inline int irq_balancing_disabled(unsigned int irq)
216 {
217         struct irq_desc *desc;
218
219         desc = irq_to_desc(irq);
220         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
221 }
222
223 static inline int irq_is_percpu(unsigned int irq)
224 {
225         struct irq_desc *desc;
226
227         desc = irq_to_desc(irq);
228         return desc->status_use_accessors & IRQ_PER_CPU;
229 }
230
231 static inline void
232 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
233 {
234         struct irq_desc *desc = irq_to_desc(irq);
235
236         if (desc)
237                 lockdep_set_class(&desc->lock, class);
238 }
239
240 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
241 static inline void
242 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
243 {
244         struct irq_desc *desc;
245
246         desc = irq_to_desc(irq);
247         desc->preflow_handler = handler;
248 }
249 #endif
250
251 #endif