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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 : * @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 0 : 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 4 : 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 5 : 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 0 : 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
