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