Merge tag 'drm-fixes-2024-06-22' of https://gitlab.freedesktop.org/drm/kernel
[linux-2.6-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 irqstat - interrupt statistics
22  * @cnt:        real-time interrupt count
23  * @ref:        snapshot of interrupt count
24  */
25 struct irqstat {
26         unsigned int    cnt;
27 #ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT
28         unsigned int    ref;
29 #endif
30 };
31
32 /**
33  * struct irq_desc - interrupt descriptor
34  * @irq_common_data:    per irq and chip data passed down to chip functions
35  * @kstat_irqs:         irq stats per cpu
36  * @handle_irq:         highlevel irq-events handler
37  * @action:             the irq action chain
38  * @status_use_accessors: status information
39  * @core_internal_state__do_not_mess_with_it: core internal status information
40  * @depth:              disable-depth, for nested irq_disable() calls
41  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
42  * @tot_count:          stats field for non-percpu irqs
43  * @irq_count:          stats field to detect stalled irqs
44  * @last_unhandled:     aging timer for unhandled count
45  * @irqs_unhandled:     stats field for spurious unhandled interrupts
46  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
47  * @threads_handled_last: comparator field for deferred spurious detection of threaded handlers
48  * @lock:               locking for SMP
49  * @affinity_hint:      hint to user space for preferred irq affinity
50  * @affinity_notify:    context for notification of affinity changes
51  * @pending_mask:       pending rebalanced interrupts
52  * @threads_oneshot:    bitfield to handle shared oneshot threads
53  * @threads_active:     number of irqaction threads currently running
54  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
55  * @nr_actions:         number of installed actions on this descriptor
56  * @no_suspend_depth:   number of irqactions on a irq descriptor with
57  *                      IRQF_NO_SUSPEND set
58  * @force_resume_depth: number of irqactions on a irq descriptor with
59  *                      IRQF_FORCE_RESUME set
60  * @rcu:                rcu head for delayed free
61  * @kobj:               kobject used to represent this struct in sysfs
62  * @request_mutex:      mutex to protect request/free before locking desc->lock
63  * @dir:                /proc/irq/ procfs entry
64  * @debugfs_file:       dentry for the debugfs file
65  * @name:               flow handler name for /proc/interrupts output
66  */
67 struct irq_desc {
68         struct irq_common_data  irq_common_data;
69         struct irq_data         irq_data;
70         struct irqstat __percpu *kstat_irqs;
71         irq_flow_handler_t      handle_irq;
72         struct irqaction        *action;        /* IRQ action list */
73         unsigned int            status_use_accessors;
74         unsigned int            core_internal_state__do_not_mess_with_it;
75         unsigned int            depth;          /* nested irq disables */
76         unsigned int            wake_depth;     /* nested wake enables */
77         unsigned int            tot_count;
78         unsigned int            irq_count;      /* For detecting broken IRQs */
79         unsigned long           last_unhandled; /* Aging timer for unhandled count */
80         unsigned int            irqs_unhandled;
81         atomic_t                threads_handled;
82         int                     threads_handled_last;
83         raw_spinlock_t          lock;
84         struct cpumask          *percpu_enabled;
85         const struct cpumask    *percpu_affinity;
86 #ifdef CONFIG_SMP
87         const struct cpumask    *affinity_hint;
88         struct irq_affinity_notify *affinity_notify;
89 #ifdef CONFIG_GENERIC_PENDING_IRQ
90         cpumask_var_t           pending_mask;
91 #endif
92 #endif
93         unsigned long           threads_oneshot;
94         atomic_t                threads_active;
95         wait_queue_head_t       wait_for_threads;
96 #ifdef CONFIG_PM_SLEEP
97         unsigned int            nr_actions;
98         unsigned int            no_suspend_depth;
99         unsigned int            cond_suspend_depth;
100         unsigned int            force_resume_depth;
101 #endif
102 #ifdef CONFIG_PROC_FS
103         struct proc_dir_entry   *dir;
104 #endif
105 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
106         struct dentry           *debugfs_file;
107         const char              *dev_name;
108 #endif
109 #ifdef CONFIG_SPARSE_IRQ
110         struct rcu_head         rcu;
111         struct kobject          kobj;
112 #endif
113         struct mutex            request_mutex;
114         int                     parent_irq;
115         struct module           *owner;
116         const char              *name;
117 #ifdef CONFIG_HARDIRQS_SW_RESEND
118         struct hlist_node       resend_node;
119 #endif
120 } ____cacheline_internodealigned_in_smp;
121
122 #ifdef CONFIG_SPARSE_IRQ
123 extern void irq_lock_sparse(void);
124 extern void irq_unlock_sparse(void);
125 #else
126 static inline void irq_lock_sparse(void) { }
127 static inline void irq_unlock_sparse(void) { }
128 extern struct irq_desc irq_desc[NR_IRQS];
129 #endif
130
131 static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
132                                               unsigned int cpu)
133 {
134         return desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;
135 }
136
137 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
138 {
139         return container_of(data->common, struct irq_desc, irq_common_data);
140 }
141
142 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
143 {
144         return desc->irq_data.irq;
145 }
146
147 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
148 {
149         return &desc->irq_data;
150 }
151
152 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
153 {
154         return desc->irq_data.chip;
155 }
156
157 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
158 {
159         return desc->irq_data.chip_data;
160 }
161
162 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
163 {
164         return desc->irq_common_data.handler_data;
165 }
166
167 /*
168  * Architectures call this to let the generic IRQ layer
169  * handle an interrupt.
170  */
171 static inline void generic_handle_irq_desc(struct irq_desc *desc)
172 {
173         desc->handle_irq(desc);
174 }
175
176 int handle_irq_desc(struct irq_desc *desc);
177 int generic_handle_irq(unsigned int irq);
178 int generic_handle_irq_safe(unsigned int irq);
179
180 #ifdef CONFIG_IRQ_DOMAIN
181 /*
182  * Convert a HW interrupt number to a logical one using a IRQ domain,
183  * and handle the result interrupt number. Return -EINVAL if
184  * conversion failed.
185  */
186 int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq);
187 int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq);
188 int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq);
189 #endif
190
191 /* Test to see if a driver has successfully requested an irq */
192 static inline int irq_desc_has_action(struct irq_desc *desc)
193 {
194         return desc && desc->action != NULL;
195 }
196
197 /**
198  * irq_set_handler_locked - Set irq handler from a locked region
199  * @data:       Pointer to the irq_data structure which identifies the irq
200  * @handler:    Flow control handler function for this interrupt
201  *
202  * Sets the handler in the irq descriptor associated to @data.
203  *
204  * Must be called with irq_desc locked and valid parameters. Typical
205  * call site is the irq_set_type() callback.
206  */
207 static inline void irq_set_handler_locked(struct irq_data *data,
208                                           irq_flow_handler_t handler)
209 {
210         struct irq_desc *desc = irq_data_to_desc(data);
211
212         desc->handle_irq = handler;
213 }
214
215 /**
216  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
217  * @data:       Pointer to the irq_data structure for which the chip is set
218  * @chip:       Pointer to the new irq chip
219  * @handler:    Flow control handler function for this interrupt
220  * @name:       Name of the interrupt
221  *
222  * Replace the irq chip at the proper hierarchy level in @data and
223  * sets the handler and name in the associated irq descriptor.
224  *
225  * Must be called with irq_desc locked and valid parameters.
226  */
227 static inline void
228 irq_set_chip_handler_name_locked(struct irq_data *data,
229                                  const struct irq_chip *chip,
230                                  irq_flow_handler_t handler, const char *name)
231 {
232         struct irq_desc *desc = irq_data_to_desc(data);
233
234         desc->handle_irq = handler;
235         desc->name = name;
236         data->chip = (struct irq_chip *)chip;
237 }
238
239 bool irq_check_status_bit(unsigned int irq, unsigned int bitmask);
240
241 static inline bool irq_balancing_disabled(unsigned int irq)
242 {
243         return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK);
244 }
245
246 static inline bool irq_is_percpu(unsigned int irq)
247 {
248         return irq_check_status_bit(irq, IRQ_PER_CPU);
249 }
250
251 static inline bool irq_is_percpu_devid(unsigned int irq)
252 {
253         return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID);
254 }
255
256 void __irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
257                              struct lock_class_key *request_class);
258 static inline void
259 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
260                       struct lock_class_key *request_class)
261 {
262         if (IS_ENABLED(CONFIG_LOCKDEP))
263                 __irq_set_lockdep_class(irq, lock_class, request_class);
264 }
265
266 #endif