1 #ifndef _LINUX_IRQDESC_H 2 #define _LINUX_IRQDESC_H 3 4 #include <linux/rcupdate.h> 5 #include <linux/kobject.h> 6 #include <linux/mutex.h> 7 8 /* 9 * Core internal functions to deal with irq descriptors 10 */ 11 12 struct irq_affinity_notify; 13 struct proc_dir_entry; 14 struct module; 15 struct irq_desc; 16 struct irq_domain; 17 struct pt_regs; 18 19 /** 20 * struct irq_desc - interrupt descriptor 21 * @irq_common_data: per irq and chip data passed down to chip functions 22 * @kstat_irqs: irq stats per cpu 23 * @handle_irq: highlevel irq-events handler 24 * @preflow_handler: handler called before the flow handler (currently used by sparc) 25 * @action: the irq action chain 26 * @status: 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 * @irq_count: stats field to detect stalled irqs 31 * @last_unhandled: aging timer for unhandled count 32 * @irqs_unhandled: stats field for spurious unhandled interrupts 33 * @threads_handled: stats field for deferred spurious detection of threaded handlers 34 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers 35 * @lock: locking for SMP 36 * @affinity_hint: hint to user space for preferred irq affinity 37 * @affinity_notify: context for notification of affinity changes 38 * @pending_mask: pending rebalanced interrupts 39 * @threads_oneshot: bitfield to handle shared oneshot threads 40 * @threads_active: number of irqaction threads currently running 41 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers 42 * @nr_actions: number of installed actions on this descriptor 43 * @no_suspend_depth: number of irqactions on a irq descriptor with 44 * IRQF_NO_SUSPEND set 45 * @force_resume_depth: number of irqactions on a irq descriptor with 46 * IRQF_FORCE_RESUME set 47 * @rcu: rcu head for delayed free 48 * @kobj: kobject used to represent this struct in sysfs 49 * @request_mutex: mutex to protect request/free before locking desc->lock 50 * @dir: /proc/irq/ procfs entry 51 * @debugfs_file: dentry for the debugfs file 52 * @name: flow handler name for /proc/interrupts output 53 */ 54 struct irq_desc { 55 struct irq_common_data irq_common_data; 56 struct irq_data irq_data; 57 unsigned int __percpu *kstat_irqs; 58 irq_flow_handler_t handle_irq; 59 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI 60 irq_preflow_handler_t preflow_handler; 61 #endif 62 struct irqaction *action; /* IRQ action list */ 63 unsigned int status_use_accessors; 64 unsigned int core_internal_state__do_not_mess_with_it; 65 unsigned int depth; /* nested irq disables */ 66 unsigned int wake_depth; /* nested wake enables */ 67 unsigned int irq_count; /* For detecting broken IRQs */ 68 unsigned long last_unhandled; /* Aging timer for unhandled count */ 69 unsigned int irqs_unhandled; 70 atomic_t threads_handled; 71 int threads_handled_last; 72 raw_spinlock_t lock; 73 struct cpumask *percpu_enabled; 74 const struct cpumask *percpu_affinity; 75 #ifdef CONFIG_SMP 76 const struct cpumask *affinity_hint; 77 struct irq_affinity_notify *affinity_notify; 78 #ifdef CONFIG_GENERIC_PENDING_IRQ 79 cpumask_var_t pending_mask; 80 #endif 81 #endif 82 unsigned long threads_oneshot; 83 atomic_t threads_active; 84 wait_queue_head_t wait_for_threads; 85 #ifdef CONFIG_PM_SLEEP 86 unsigned int nr_actions; 87 unsigned int no_suspend_depth; 88 unsigned int cond_suspend_depth; 89 unsigned int force_resume_depth; 90 #endif 91 #ifdef CONFIG_PROC_FS 92 struct proc_dir_entry *dir; 93 #endif 94 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS 95 struct dentry *debugfs_file; 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 } ____cacheline_internodealigned_in_smp; 106 107 #ifdef CONFIG_SPARSE_IRQ 108 extern void irq_lock_sparse(void); 109 extern void irq_unlock_sparse(void); 110 #else 111 static inline void irq_lock_sparse(void) { } 112 static inline void irq_unlock_sparse(void) { } 113 extern struct irq_desc irq_desc[NR_IRQS]; 114 #endif 115 116 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data) 117 { 118 return container_of(data->common, struct irq_desc, irq_common_data); 119 } 120 121 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc) 122 { 123 return desc->irq_data.irq; 124 } 125 126 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) 127 { 128 return &desc->irq_data; 129 } 130 131 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) 132 { 133 return desc->irq_data.chip; 134 } 135 136 static inline void *irq_desc_get_chip_data(struct irq_desc *desc) 137 { 138 return desc->irq_data.chip_data; 139 } 140 141 static inline void *irq_desc_get_handler_data(struct irq_desc *desc) 142 { 143 return desc->irq_common_data.handler_data; 144 } 145 146 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) 147 { 148 return desc->irq_common_data.msi_desc; 149 } 150 151 /* 152 * Architectures call this to let the generic IRQ layer 153 * handle an interrupt. 154 */ 155 static inline void generic_handle_irq_desc(struct irq_desc *desc) 156 { 157 desc->handle_irq(desc); 158 } 159 160 int generic_handle_irq(unsigned int irq); 161 162 #ifdef CONFIG_HANDLE_DOMAIN_IRQ 163 /* 164 * Convert a HW interrupt number to a logical one using a IRQ domain, 165 * and handle the result interrupt number. Return -EINVAL if 166 * conversion failed. Providing a NULL domain indicates that the 167 * conversion has already been done. 168 */ 169 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, 170 bool lookup, struct pt_regs *regs); 171 172 static inline int handle_domain_irq(struct irq_domain *domain, 173 unsigned int hwirq, struct pt_regs *regs) 174 { 175 return __handle_domain_irq(domain, hwirq, true, regs); 176 } 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->action != NULL; 183 } 184 185 static inline int irq_has_action(unsigned int irq) 186 { 187 return irq_desc_has_action(irq_to_desc(irq)); 188 } 189 190 /** 191 * irq_set_handler_locked - Set irq handler from a locked region 192 * @data: Pointer to the irq_data structure which identifies the irq 193 * @handler: Flow control handler function for this interrupt 194 * 195 * Sets the handler in the irq descriptor associated to @data. 196 * 197 * Must be called with irq_desc locked and valid parameters. Typical 198 * call site is the irq_set_type() callback. 199 */ 200 static inline void irq_set_handler_locked(struct irq_data *data, 201 irq_flow_handler_t handler) 202 { 203 struct irq_desc *desc = irq_data_to_desc(data); 204 205 desc->handle_irq = handler; 206 } 207 208 /** 209 * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region 210 * @data: Pointer to the irq_data structure for which the chip is set 211 * @chip: Pointer to the new irq chip 212 * @handler: Flow control handler function for this interrupt 213 * @name: Name of the interrupt 214 * 215 * Replace the irq chip at the proper hierarchy level in @data and 216 * sets the handler and name in the associated irq descriptor. 217 * 218 * Must be called with irq_desc locked and valid parameters. 219 */ 220 static inline void 221 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip, 222 irq_flow_handler_t handler, const char *name) 223 { 224 struct irq_desc *desc = irq_data_to_desc(data); 225 226 desc->handle_irq = handler; 227 desc->name = name; 228 data->chip = chip; 229 } 230 231 static inline int irq_balancing_disabled(unsigned int irq) 232 { 233 struct irq_desc *desc; 234 235 desc = irq_to_desc(irq); 236 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; 237 } 238 239 static inline int irq_is_percpu(unsigned int irq) 240 { 241 struct irq_desc *desc; 242 243 desc = irq_to_desc(irq); 244 return desc->status_use_accessors & IRQ_PER_CPU; 245 } 246 247 static inline void 248 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) 249 { 250 struct irq_desc *desc = irq_to_desc(irq); 251 252 if (desc) 253 lockdep_set_class(&desc->lock, class); 254 } 255 256 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI 257 static inline void 258 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) 259 { 260 struct irq_desc *desc; 261 262 desc = irq_to_desc(irq); 263 desc->preflow_handler = handler; 264 } 265 #endif 266 267 #endif 268