Merge tag 'wq-for-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
[linux-block.git] / include / linux / irqdesc.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_IRQDESC_H
3 #define _LINUX_IRQDESC_H
4
5 #include <linux/rcupdate.h>
6 #include <linux/kobject.h>
7 #include <linux/mutex.h>
8
9 /*
10  * Core internal functions to deal with irq descriptors
11  */
12
13 struct irq_affinity_notify;
14 struct proc_dir_entry;
15 struct module;
16 struct irq_desc;
17 struct irq_domain;
18 struct pt_regs;
19
20 /**
21  * struct irq_desc - interrupt descriptor
22  * @irq_common_data:    per irq and chip data passed down to chip functions
23  * @kstat_irqs:         irq stats per cpu
24  * @handle_irq:         highlevel irq-events handler
25  * @action:             the irq action chain
26  * @status_use_accessors: status information
27  * @core_internal_state__do_not_mess_with_it: core internal status information
28  * @depth:              disable-depth, for nested irq_disable() calls
29  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
30  * @tot_count:          stats field for non-percpu irqs
31  * @irq_count:          stats field to detect stalled irqs
32  * @last_unhandled:     aging timer for unhandled count
33  * @irqs_unhandled:     stats field for spurious unhandled interrupts
34  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
35  * @threads_handled_last: comparator field for deferred spurious detection of threaded handlers
36  * @lock:               locking for SMP
37  * @affinity_hint:      hint to user space for preferred irq affinity
38  * @affinity_notify:    context for notification of affinity changes
39  * @pending_mask:       pending rebalanced interrupts
40  * @threads_oneshot:    bitfield to handle shared oneshot threads
41  * @threads_active:     number of irqaction threads currently running
42  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
43  * @nr_actions:         number of installed actions on this descriptor
44  * @no_suspend_depth:   number of irqactions on a irq descriptor with
45  *                      IRQF_NO_SUSPEND set
46  * @force_resume_depth: number of irqactions on a irq descriptor with
47  *                      IRQF_FORCE_RESUME set
48  * @rcu:                rcu head for delayed free
49  * @kobj:               kobject used to represent this struct in sysfs
50  * @request_mutex:      mutex to protect request/free before locking desc->lock
51  * @dir:                /proc/irq/ procfs entry
52  * @debugfs_file:       dentry for the debugfs file
53  * @name:               flow handler name for /proc/interrupts output
54  */
55 struct irq_desc {
56         struct irq_common_data  irq_common_data;
57         struct irq_data         irq_data;
58         unsigned int __percpu   *kstat_irqs;
59         irq_flow_handler_t      handle_irq;
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            tot_count;
66         unsigned int            irq_count;      /* For detecting broken IRQs */
67         unsigned long           last_unhandled; /* Aging timer for unhandled count */
68         unsigned int            irqs_unhandled;
69         atomic_t                threads_handled;
70         int                     threads_handled_last;
71         raw_spinlock_t          lock;
72         struct cpumask          *percpu_enabled;
73         const struct cpumask    *percpu_affinity;
74 #ifdef CONFIG_SMP
75         const struct cpumask    *affinity_hint;
76         struct irq_affinity_notify *affinity_notify;
77 #ifdef CONFIG_GENERIC_PENDING_IRQ
78         cpumask_var_t           pending_mask;
79 #endif
80 #endif
81         unsigned long           threads_oneshot;
82         atomic_t                threads_active;
83         wait_queue_head_t       wait_for_threads;
84 #ifdef CONFIG_PM_SLEEP
85         unsigned int            nr_actions;
86         unsigned int            no_suspend_depth;
87         unsigned int            cond_suspend_depth;
88         unsigned int            force_resume_depth;
89 #endif
90 #ifdef CONFIG_PROC_FS
91         struct proc_dir_entry   *dir;
92 #endif
93 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
94         struct dentry           *debugfs_file;
95         const char              *dev_name;
96 #endif
97 #ifdef CONFIG_SPARSE_IRQ
98         struct rcu_head         rcu;
99         struct kobject          kobj;
100 #endif
101         struct mutex            request_mutex;
102         int                     parent_irq;
103         struct module           *owner;
104         const char              *name;
105 #ifdef CONFIG_HARDIRQS_SW_RESEND
106         struct hlist_node       resend_node;
107 #endif
108 } ____cacheline_internodealigned_in_smp;
109
110 #ifdef CONFIG_SPARSE_IRQ
111 extern void irq_lock_sparse(void);
112 extern void irq_unlock_sparse(void);
113 #else
114 static inline void irq_lock_sparse(void) { }
115 static inline void irq_unlock_sparse(void) { }
116 extern struct irq_desc irq_desc[NR_IRQS];
117 #endif
118
119 static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
120                                               unsigned int cpu)
121 {
122         return desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
123 }
124
125 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
126 {
127         return container_of(data->common, struct irq_desc, irq_common_data);
128 }
129
130 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
131 {
132         return desc->irq_data.irq;
133 }
134
135 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
136 {
137         return &desc->irq_data;
138 }
139
140 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
141 {
142         return desc->irq_data.chip;
143 }
144
145 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
146 {
147         return desc->irq_data.chip_data;
148 }
149
150 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
151 {
152         return desc->irq_common_data.handler_data;
153 }
154
155 /*
156  * Architectures call this to let the generic IRQ layer
157  * handle an interrupt.
158  */
159 static inline void generic_handle_irq_desc(struct irq_desc *desc)
160 {
161         desc->handle_irq(desc);
162 }
163
164 int handle_irq_desc(struct irq_desc *desc);
165 int generic_handle_irq(unsigned int irq);
166 int generic_handle_irq_safe(unsigned int irq);
167
168 #ifdef CONFIG_IRQ_DOMAIN
169 /*
170  * Convert a HW interrupt number to a logical one using a IRQ domain,
171  * and handle the result interrupt number. Return -EINVAL if
172  * conversion failed.
173  */
174 int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq);
175 int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq);
176 int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq);
177 #endif
178
179 /* Test to see if a driver has successfully requested an irq */
180 static inline int irq_desc_has_action(struct irq_desc *desc)
181 {
182         return desc && desc->action != NULL;
183 }
184
185 /**
186  * irq_set_handler_locked - Set irq handler from a locked region
187  * @data:       Pointer to the irq_data structure which identifies the irq
188  * @handler:    Flow control handler function for this interrupt
189  *
190  * Sets the handler in the irq descriptor associated to @data.
191  *
192  * Must be called with irq_desc locked and valid parameters. Typical
193  * call site is the irq_set_type() callback.
194  */
195 static inline void irq_set_handler_locked(struct irq_data *data,
196                                           irq_flow_handler_t handler)
197 {
198         struct irq_desc *desc = irq_data_to_desc(data);
199
200         desc->handle_irq = handler;
201 }
202
203 /**
204  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
205  * @data:       Pointer to the irq_data structure for which the chip is set
206  * @chip:       Pointer to the new irq chip
207  * @handler:    Flow control handler function for this interrupt
208  * @name:       Name of the interrupt
209  *
210  * Replace the irq chip at the proper hierarchy level in @data and
211  * sets the handler and name in the associated irq descriptor.
212  *
213  * Must be called with irq_desc locked and valid parameters.
214  */
215 static inline void
216 irq_set_chip_handler_name_locked(struct irq_data *data,
217                                  const struct irq_chip *chip,
218                                  irq_flow_handler_t handler, const char *name)
219 {
220         struct irq_desc *desc = irq_data_to_desc(data);
221
222         desc->handle_irq = handler;
223         desc->name = name;
224         data->chip = (struct irq_chip *)chip;
225 }
226
227 bool irq_check_status_bit(unsigned int irq, unsigned int bitmask);
228
229 static inline bool irq_balancing_disabled(unsigned int irq)
230 {
231         return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK);
232 }
233
234 static inline bool irq_is_percpu(unsigned int irq)
235 {
236         return irq_check_status_bit(irq, IRQ_PER_CPU);
237 }
238
239 static inline bool irq_is_percpu_devid(unsigned int irq)
240 {
241         return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID);
242 }
243
244 void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
245                              struct lock_class_key *request_class);
246 static inline void
247 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
248                       struct lock_class_key *request_class)
249 {
250         if (IS_ENABLED(CONFIG_LOCKDEP))
251                 __irq_set_lockdep_class(irq, lock_class, request_class);
252 }
253
254 #endif