1 #ifndef _LINUX_IRQDESC_H
2 #define _LINUX_IRQDESC_H
3
4 /*
5 * Core internal functions to deal with irq descriptors
6 *
7 * This include will move to kernel/irq once we cleaned up the tree.
8 * For now it's included from <linux/irq.h>
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_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 * @dir: /proc/irq/ procfs entry
47 * @name: flow handler name for /proc/interrupts output
48 */
49 struct irq_desc {
50 struct irq_data irq_data;
51 unsigned int __percpu *kstat_irqs;
52 irq_flow_handler_t handle_irq;
53 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
54 irq_preflow_handler_t preflow_handler;
55 #endif
56 struct irqaction *action; /* IRQ action list */
57 unsigned int status_use_accessors;
58 unsigned int core_internal_state__do_not_mess_with_it;
59 unsigned int depth; /* nested irq disables */
60 unsigned int wake_depth; /* nested wake enables */
61 unsigned int irq_count; /* For detecting broken IRQs */
62 unsigned long last_unhandled; /* Aging timer for unhandled count */
63 unsigned int irqs_unhandled;
64 atomic_t threads_handled;
65 int threads_handled_last;
66 raw_spinlock_t lock;
67 struct cpumask *percpu_enabled;
68 #ifdef CONFIG_SMP
69 const struct cpumask *affinity_hint;
70 struct irq_affinity_notify *affinity_notify;
71 #ifdef CONFIG_GENERIC_PENDING_IRQ
72 cpumask_var_t pending_mask;
73 #endif
74 #endif
75 unsigned long threads_oneshot;
76 atomic_t threads_active;
77 wait_queue_head_t wait_for_threads;
78 #ifdef CONFIG_PM_SLEEP
79 unsigned int nr_actions;
80 unsigned int no_suspend_depth;
81 unsigned int cond_suspend_depth;
82 unsigned int force_resume_depth;
83 #endif
84 #ifdef CONFIG_PROC_FS
85 struct proc_dir_entry *dir;
86 #endif
87 int parent_irq;
88 struct module *owner;
89 const char *name;
90 } ____cacheline_internodealigned_in_smp;
91
92 #ifndef CONFIG_SPARSE_IRQ
93 extern struct irq_desc irq_desc[NR_IRQS];
94 #endif
95
irq_desc_get_irq_data(struct irq_desc * desc)96 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
97 {
98 return &desc->irq_data;
99 }
100
irq_desc_get_chip(struct irq_desc * desc)101 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
102 {
103 return desc->irq_data.chip;
104 }
105
irq_desc_get_chip_data(struct irq_desc * desc)106 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
107 {
108 return desc->irq_data.chip_data;
109 }
110
irq_desc_get_handler_data(struct irq_desc * desc)111 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
112 {
113 return desc->irq_data.handler_data;
114 }
115
irq_desc_get_msi_desc(struct irq_desc * desc)116 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
117 {
118 return desc->irq_data.msi_desc;
119 }
120
121 /*
122 * Architectures call this to let the generic IRQ layer
123 * handle an interrupt. If the descriptor is attached to an
124 * irqchip-style controller then we call the ->handle_irq() handler,
125 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
126 */
generic_handle_irq_desc(unsigned int irq,struct irq_desc * desc)127 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
128 {
129 desc->handle_irq(irq, desc);
130 }
131
132 int generic_handle_irq(unsigned int irq);
133
134 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
135 /*
136 * Convert a HW interrupt number to a logical one using a IRQ domain,
137 * and handle the result interrupt number. Return -EINVAL if
138 * conversion failed. Providing a NULL domain indicates that the
139 * conversion has already been done.
140 */
141 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
142 bool lookup, struct pt_regs *regs);
143
handle_domain_irq(struct irq_domain * domain,unsigned int hwirq,struct pt_regs * regs)144 static inline int handle_domain_irq(struct irq_domain *domain,
145 unsigned int hwirq, struct pt_regs *regs)
146 {
147 return __handle_domain_irq(domain, hwirq, true, regs);
148 }
149 #endif
150
151 /* Test to see if a driver has successfully requested an irq */
irq_has_action(unsigned int irq)152 static inline int irq_has_action(unsigned int irq)
153 {
154 struct irq_desc *desc = irq_to_desc(irq);
155 return desc->action != NULL;
156 }
157
158 /* caller has locked the irq_desc and both params are valid */
__irq_set_handler_locked(unsigned int irq,irq_flow_handler_t handler)159 static inline void __irq_set_handler_locked(unsigned int irq,
160 irq_flow_handler_t handler)
161 {
162 struct irq_desc *desc;
163
164 desc = irq_to_desc(irq);
165 desc->handle_irq = handler;
166 }
167
168 /* caller has locked the irq_desc and both params are valid */
169 static inline void
__irq_set_chip_handler_name_locked(unsigned int irq,struct irq_chip * chip,irq_flow_handler_t handler,const char * name)170 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
171 irq_flow_handler_t handler, const char *name)
172 {
173 struct irq_desc *desc;
174
175 desc = irq_to_desc(irq);
176 irq_desc_get_irq_data(desc)->chip = chip;
177 desc->handle_irq = handler;
178 desc->name = name;
179 }
180
irq_balancing_disabled(unsigned int irq)181 static inline int irq_balancing_disabled(unsigned int irq)
182 {
183 struct irq_desc *desc;
184
185 desc = irq_to_desc(irq);
186 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
187 }
188
irq_is_percpu(unsigned int irq)189 static inline int irq_is_percpu(unsigned int irq)
190 {
191 struct irq_desc *desc;
192
193 desc = irq_to_desc(irq);
194 return desc->status_use_accessors & IRQ_PER_CPU;
195 }
196
197 static inline void
irq_set_lockdep_class(unsigned int irq,struct lock_class_key * class)198 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
199 {
200 struct irq_desc *desc = irq_to_desc(irq);
201
202 if (desc)
203 lockdep_set_class(&desc->lock, class);
204 }
205
206 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
207 static inline void
__irq_set_preflow_handler(unsigned int irq,irq_preflow_handler_t handler)208 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
209 {
210 struct irq_desc *desc;
211
212 desc = irq_to_desc(irq);
213 desc->preflow_handler = handler;
214 }
215 #endif
216
217 #endif
218