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Linux/include/linux/irqdesc.h

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  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  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
 26  * @action:             the irq action chain
 27  * @status:             status information
 28  * @core_internal_state__do_not_mess_with_it: core internal status information
 29  * @depth:              disable-depth, for nested irq_disable() calls
 30  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
 31  * @tot_count:          stats field for non-percpu irqs
 32  * @irq_count:          stats field to detect stalled irqs
 33  * @last_unhandled:     aging timer for unhandled count
 34  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 35  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
 36  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
 37  * @lock:               locking for SMP
 38  * @affinity_hint:      hint to user space for preferred irq affinity
 39  * @affinity_notify:    context for notification of affinity changes
 40  * @pending_mask:       pending rebalanced interrupts
 41  * @threads_oneshot:    bitfield to handle shared oneshot threads
 42  * @threads_active:     number of irqaction threads currently running
 43  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
 44  * @nr_actions:         number of installed actions on this descriptor
 45  * @no_suspend_depth:   number of irqactions on a irq descriptor with
 46  *                      IRQF_NO_SUSPEND set
 47  * @force_resume_depth: number of irqactions on a irq descriptor with
 48  *                      IRQF_FORCE_RESUME set
 49  * @rcu:                rcu head for delayed free
 50  * @kobj:               kobject used to represent this struct in sysfs
 51  * @request_mutex:      mutex to protect request/free before locking desc->lock
 52  * @dir:                /proc/irq/ procfs entry
 53  * @debugfs_file:       dentry for the debugfs file
 54  * @name:               flow handler name for /proc/interrupts output
 55  */
 56 struct irq_desc {
 57         struct irq_common_data  irq_common_data;
 58         struct irq_data         irq_data;
 59         unsigned int __percpu   *kstat_irqs;
 60         irq_flow_handler_t      handle_irq;
 61 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 62         irq_preflow_handler_t   preflow_handler;
 63 #endif
 64         struct irqaction        *action;        /* IRQ action list */
 65         unsigned int            status_use_accessors;
 66         unsigned int            core_internal_state__do_not_mess_with_it;
 67         unsigned int            depth;          /* nested irq disables */
 68         unsigned int            wake_depth;     /* nested wake enables */
 69         unsigned int            tot_count;
 70         unsigned int            irq_count;      /* For detecting broken IRQs */
 71         unsigned long           last_unhandled; /* Aging timer for unhandled count */
 72         unsigned int            irqs_unhandled;
 73         atomic_t                threads_handled;
 74         int                     threads_handled_last;
 75         raw_spinlock_t          lock;
 76         struct cpumask          *percpu_enabled;
 77         const struct cpumask    *percpu_affinity;
 78 #ifdef CONFIG_SMP
 79         const struct cpumask    *affinity_hint;
 80         struct irq_affinity_notify *affinity_notify;
 81 #ifdef CONFIG_GENERIC_PENDING_IRQ
 82         cpumask_var_t           pending_mask;
 83 #endif
 84 #endif
 85         unsigned long           threads_oneshot;
 86         atomic_t                threads_active;
 87         wait_queue_head_t       wait_for_threads;
 88 #ifdef CONFIG_PM_SLEEP
 89         unsigned int            nr_actions;
 90         unsigned int            no_suspend_depth;
 91         unsigned int            cond_suspend_depth;
 92         unsigned int            force_resume_depth;
 93 #endif
 94 #ifdef CONFIG_PROC_FS
 95         struct proc_dir_entry   *dir;
 96 #endif
 97 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
 98         struct dentry           *debugfs_file;
 99         const char              *dev_name;
100 #endif
101 #ifdef CONFIG_SPARSE_IRQ
102         struct rcu_head         rcu;
103         struct kobject          kobj;
104 #endif
105         struct mutex            request_mutex;
106         int                     parent_irq;
107         struct module           *owner;
108         const char              *name;
109 } ____cacheline_internodealigned_in_smp;
110 
111 #ifdef CONFIG_SPARSE_IRQ
112 extern void irq_lock_sparse(void);
113 extern void irq_unlock_sparse(void);
114 #else
115 static inline void irq_lock_sparse(void) { }
116 static inline void irq_unlock_sparse(void) { }
117 extern struct irq_desc irq_desc[NR_IRQS];
118 #endif
119 
120 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
121 {
122         return container_of(data->common, struct irq_desc, irq_common_data);
123 }
124 
125 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
126 {
127         return desc->irq_data.irq;
128 }
129 
130 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
131 {
132         return &desc->irq_data;
133 }
134 
135 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
136 {
137         return desc->irq_data.chip;
138 }
139 
140 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
141 {
142         return desc->irq_data.chip_data;
143 }
144 
145 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
146 {
147         return desc->irq_common_data.handler_data;
148 }
149 
150 /*
151  * Architectures call this to let the generic IRQ layer
152  * handle an interrupt.
153  */
154 static inline void generic_handle_irq_desc(struct irq_desc *desc)
155 {
156         desc->handle_irq(desc);
157 }
158 
159 int generic_handle_irq(unsigned int irq);
160 
161 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
162 /*
163  * Convert a HW interrupt number to a logical one using a IRQ domain,
164  * and handle the result interrupt number. Return -EINVAL if
165  * conversion failed. Providing a NULL domain indicates that the
166  * conversion has already been done.
167  */
168 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
169                         bool lookup, struct pt_regs *regs);
170 
171 static inline int handle_domain_irq(struct irq_domain *domain,
172                                     unsigned int hwirq, struct pt_regs *regs)
173 {
174         return __handle_domain_irq(domain, hwirq, true, regs);
175 }
176 
177 #ifdef CONFIG_IRQ_DOMAIN
178 int handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq,
179                       struct pt_regs *regs);
180 #endif
181 #endif
182 
183 /* Test to see if a driver has successfully requested an irq */
184 static inline int irq_desc_has_action(struct irq_desc *desc)
185 {
186         return desc->action != NULL;
187 }
188 
189 static inline int irq_has_action(unsigned int irq)
190 {
191         return irq_desc_has_action(irq_to_desc(irq));
192 }
193 
194 /**
195  * irq_set_handler_locked - Set irq handler from a locked region
196  * @data:       Pointer to the irq_data structure which identifies the irq
197  * @handler:    Flow control handler function for this interrupt
198  *
199  * Sets the handler in the irq descriptor associated to @data.
200  *
201  * Must be called with irq_desc locked and valid parameters. Typical
202  * call site is the irq_set_type() callback.
203  */
204 static inline void irq_set_handler_locked(struct irq_data *data,
205                                           irq_flow_handler_t handler)
206 {
207         struct irq_desc *desc = irq_data_to_desc(data);
208 
209         desc->handle_irq = handler;
210 }
211 
212 /**
213  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
214  * @data:       Pointer to the irq_data structure for which the chip is set
215  * @chip:       Pointer to the new irq chip
216  * @handler:    Flow control handler function for this interrupt
217  * @name:       Name of the interrupt
218  *
219  * Replace the irq chip at the proper hierarchy level in @data and
220  * sets the handler and name in the associated irq descriptor.
221  *
222  * Must be called with irq_desc locked and valid parameters.
223  */
224 static inline void
225 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
226                                  irq_flow_handler_t handler, const char *name)
227 {
228         struct irq_desc *desc = irq_data_to_desc(data);
229 
230         desc->handle_irq = handler;
231         desc->name = name;
232         data->chip = chip;
233 }
234 
235 static inline bool irq_balancing_disabled(unsigned int irq)
236 {
237         struct irq_desc *desc;
238 
239         desc = irq_to_desc(irq);
240         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
241 }
242 
243 static inline bool irq_is_percpu(unsigned int irq)
244 {
245         struct irq_desc *desc;
246 
247         desc = irq_to_desc(irq);
248         return desc->status_use_accessors & IRQ_PER_CPU;
249 }
250 
251 static inline bool irq_is_percpu_devid(unsigned int irq)
252 {
253         struct irq_desc *desc;
254 
255         desc = irq_to_desc(irq);
256         return desc->status_use_accessors & IRQ_PER_CPU_DEVID;
257 }
258 
259 static inline void
260 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *lock_class,
261                       struct lock_class_key *request_class)
262 {
263         struct irq_desc *desc = irq_to_desc(irq);
264 
265         if (desc) {
266                 lockdep_set_class(&desc->lock, lock_class);
267                 lockdep_set_class(&desc->request_mutex, request_class);
268         }
269 }
270 
271 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
272 static inline void
273 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
274 {
275         struct irq_desc *desc;
276 
277         desc = irq_to_desc(irq);
278         desc->preflow_handler = handler;
279 }
280 #endif
281 
282 #endif
283 

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