1 #ifndef _LINUX_IRQDESC_H 2 #define _LINUX_IRQDESC_H 3 4 /* 5 * Core internal functions to deal with irq descriptors 6 * 7 * This include will move to kernel/irq once we cleaned up the tree. 8 * For now it's included from <linux/irq.h> 9 */ 10 11 struct irq_affinity_notify; 12 struct proc_dir_entry; 13 struct module; 14 struct irq_desc; 15 struct irq_domain; 16 struct pt_regs; 17 18 /** 19 * struct irq_desc - interrupt descriptor 20 * @irq_data: per irq and chip data passed down to chip functions 21 * @kstat_irqs: irq stats per cpu 22 * @handle_irq: highlevel irq-events handler 23 * @preflow_handler: handler called before the flow handler (currently used by sparc) 24 * @action: the irq action chain 25 * @status: status information 26 * @core_internal_state__do_not_mess_with_it: core internal status information 27 * @depth: disable-depth, for nested irq_disable() calls 28 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers 29 * @irq_count: stats field to detect stalled irqs 30 * @last_unhandled: aging timer for unhandled count 31 * @irqs_unhandled: stats field for spurious unhandled interrupts 32 * @threads_handled: stats field for deferred spurious detection of threaded handlers 33 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers 34 * @lock: locking for SMP 35 * @affinity_hint: hint to user space for preferred irq affinity 36 * @affinity_notify: context for notification of affinity changes 37 * @pending_mask: pending rebalanced interrupts 38 * @threads_oneshot: bitfield to handle shared oneshot threads 39 * @threads_active: number of irqaction threads currently running 40 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers 41 * @nr_actions: number of installed actions on this descriptor 42 * @no_suspend_depth: number of irqactions on a irq descriptor with 43 * IRQF_NO_SUSPEND set 44 * @force_resume_depth: number of irqactions on a irq descriptor with 45 * IRQF_FORCE_RESUME set 46 * @dir: /proc/irq/ procfs entry 47 * @name: flow handler name for /proc/interrupts output 48 */ 49 struct irq_desc { 50 struct irq_data irq_data; 51 unsigned int __percpu *kstat_irqs; 52 irq_flow_handler_t handle_irq; 53 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI 54 irq_preflow_handler_t preflow_handler; 55 #endif 56 struct irqaction *action; /* IRQ action list */ 57 unsigned int status_use_accessors; 58 unsigned int core_internal_state__do_not_mess_with_it; 59 unsigned int depth; /* nested irq disables */ 60 unsigned int wake_depth; /* nested wake enables */ 61 unsigned int irq_count; /* For detecting broken IRQs */ 62 unsigned long last_unhandled; /* Aging timer for unhandled count */ 63 unsigned int irqs_unhandled; 64 atomic_t threads_handled; 65 int threads_handled_last; 66 raw_spinlock_t lock; 67 struct cpumask *percpu_enabled; 68 #ifdef CONFIG_SMP 69 const struct cpumask *affinity_hint; 70 struct irq_affinity_notify *affinity_notify; 71 #ifdef CONFIG_GENERIC_PENDING_IRQ 72 cpumask_var_t pending_mask; 73 #endif 74 #endif 75 unsigned long threads_oneshot; 76 atomic_t threads_active; 77 wait_queue_head_t wait_for_threads; 78 #ifdef CONFIG_PM_SLEEP 79 unsigned int nr_actions; 80 unsigned int no_suspend_depth; 81 unsigned int cond_suspend_depth; 82 unsigned int force_resume_depth; 83 #endif 84 #ifdef CONFIG_PROC_FS 85 struct proc_dir_entry *dir; 86 #endif 87 int parent_irq; 88 struct module *owner; 89 const char *name; 90 } ____cacheline_internodealigned_in_smp; 91 92 #ifndef CONFIG_SPARSE_IRQ 93 extern struct irq_desc irq_desc[NR_IRQS]; 94 #endif 95 96 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) 97 { 98 return &desc->irq_data; 99 } 100 101 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) 102 { 103 return desc->irq_data.chip; 104 } 105 106 static inline void *irq_desc_get_chip_data(struct irq_desc *desc) 107 { 108 return desc->irq_data.chip_data; 109 } 110 111 static inline void *irq_desc_get_handler_data(struct irq_desc *desc) 112 { 113 return desc->irq_data.handler_data; 114 } 115 116 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) 117 { 118 return desc->irq_data.msi_desc; 119 } 120 121 /* 122 * Architectures call this to let the generic IRQ layer 123 * handle an interrupt. If the descriptor is attached to an 124 * irqchip-style controller then we call the ->handle_irq() handler, 125 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 126 */ 127 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) 128 { 129 desc->handle_irq(irq, desc); 130 } 131 132 int generic_handle_irq(unsigned int irq); 133 134 #ifdef CONFIG_HANDLE_DOMAIN_IRQ 135 /* 136 * Convert a HW interrupt number to a logical one using a IRQ domain, 137 * and handle the result interrupt number. Return -EINVAL if 138 * conversion failed. Providing a NULL domain indicates that the 139 * conversion has already been done. 140 */ 141 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq, 142 bool lookup, struct pt_regs *regs); 143 144 static inline int handle_domain_irq(struct irq_domain *domain, 145 unsigned int hwirq, struct pt_regs *regs) 146 { 147 return __handle_domain_irq(domain, hwirq, true, regs); 148 } 149 #endif 150 151 /* Test to see if a driver has successfully requested an irq */ 152 static inline int irq_has_action(unsigned int irq) 153 { 154 struct irq_desc *desc = irq_to_desc(irq); 155 return desc->action != NULL; 156 } 157 158 /* caller has locked the irq_desc and both params are valid */ 159 static inline void __irq_set_handler_locked(unsigned int irq, 160 irq_flow_handler_t handler) 161 { 162 struct irq_desc *desc; 163 164 desc = irq_to_desc(irq); 165 desc->handle_irq = handler; 166 } 167 168 /* caller has locked the irq_desc and both params are valid */ 169 static inline void 170 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip, 171 irq_flow_handler_t handler, const char *name) 172 { 173 struct irq_desc *desc; 174 175 desc = irq_to_desc(irq); 176 irq_desc_get_irq_data(desc)->chip = chip; 177 desc->handle_irq = handler; 178 desc->name = name; 179 } 180 181 static inline int irq_balancing_disabled(unsigned int irq) 182 { 183 struct irq_desc *desc; 184 185 desc = irq_to_desc(irq); 186 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; 187 } 188 189 static inline int irq_is_percpu(unsigned int irq) 190 { 191 struct irq_desc *desc; 192 193 desc = irq_to_desc(irq); 194 return desc->status_use_accessors & IRQ_PER_CPU; 195 } 196 197 static inline void 198 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) 199 { 200 struct irq_desc *desc = irq_to_desc(irq); 201 202 if (desc) 203 lockdep_set_class(&desc->lock, class); 204 } 205 206 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI 207 static inline void 208 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) 209 { 210 struct irq_desc *desc; 211 212 desc = irq_to_desc(irq); 213 desc->preflow_handler = handler; 214 } 215 #endif 216 217 #endif 218