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 16 /** 17 * struct irq_desc - interrupt descriptor 18 * @irq_data: per irq and chip data passed down to chip functions 19 * @kstat_irqs: irq stats per cpu 20 * @handle_irq: highlevel irq-events handler 21 * @preflow_handler: handler called before the flow handler (currently used by sparc) 22 * @action: the irq action chain 23 * @status: status information 24 * @core_internal_state__do_not_mess_with_it: core internal status information 25 * @depth: disable-depth, for nested irq_disable() calls 26 * @wake_depth: enable depth, for multiple irq_set_irq_wake() callers 27 * @irq_count: stats field to detect stalled irqs 28 * @last_unhandled: aging timer for unhandled count 29 * @irqs_unhandled: stats field for spurious unhandled interrupts 30 * @threads_handled: stats field for deferred spurious detection of threaded handlers 31 * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers 32 * @lock: locking for SMP 33 * @affinity_hint: hint to user space for preferred irq affinity 34 * @affinity_notify: context for notification of affinity changes 35 * @pending_mask: pending rebalanced interrupts 36 * @threads_oneshot: bitfield to handle shared oneshot threads 37 * @threads_active: number of irqaction threads currently running 38 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers 39 * @dir: /proc/irq/ procfs entry 40 * @name: flow handler name for /proc/interrupts output 41 */ 42 struct irq_desc { 43 struct irq_data irq_data; 44 unsigned int __percpu *kstat_irqs; 45 irq_flow_handler_t handle_irq; 46 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI 47 irq_preflow_handler_t preflow_handler; 48 #endif 49 struct irqaction *action; /* IRQ action list */ 50 unsigned int status_use_accessors; 51 unsigned int core_internal_state__do_not_mess_with_it; 52 unsigned int depth; /* nested irq disables */ 53 unsigned int wake_depth; /* nested wake enables */ 54 unsigned int irq_count; /* For detecting broken IRQs */ 55 unsigned long last_unhandled; /* Aging timer for unhandled count */ 56 unsigned int irqs_unhandled; 57 atomic_t threads_handled; 58 int threads_handled_last; 59 raw_spinlock_t lock; 60 struct cpumask *percpu_enabled; 61 #ifdef CONFIG_SMP 62 const struct cpumask *affinity_hint; 63 struct irq_affinity_notify *affinity_notify; 64 #ifdef CONFIG_GENERIC_PENDING_IRQ 65 cpumask_var_t pending_mask; 66 #endif 67 #endif 68 unsigned long threads_oneshot; 69 atomic_t threads_active; 70 wait_queue_head_t wait_for_threads; 71 #ifdef CONFIG_PROC_FS 72 struct proc_dir_entry *dir; 73 #endif 74 int parent_irq; 75 struct module *owner; 76 const char *name; 77 } ____cacheline_internodealigned_in_smp; 78 79 #ifndef CONFIG_SPARSE_IRQ 80 extern struct irq_desc irq_desc[NR_IRQS]; 81 #endif 82 83 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) 84 { 85 return &desc->irq_data; 86 } 87 88 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) 89 { 90 return desc->irq_data.chip; 91 } 92 93 static inline void *irq_desc_get_chip_data(struct irq_desc *desc) 94 { 95 return desc->irq_data.chip_data; 96 } 97 98 static inline void *irq_desc_get_handler_data(struct irq_desc *desc) 99 { 100 return desc->irq_data.handler_data; 101 } 102 103 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) 104 { 105 return desc->irq_data.msi_desc; 106 } 107 108 /* 109 * Architectures call this to let the generic IRQ layer 110 * handle an interrupt. If the descriptor is attached to an 111 * irqchip-style controller then we call the ->handle_irq() handler, 112 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 113 */ 114 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) 115 { 116 desc->handle_irq(irq, desc); 117 } 118 119 int generic_handle_irq(unsigned int irq); 120 121 /* Test to see if a driver has successfully requested an irq */ 122 static inline int irq_has_action(unsigned int irq) 123 { 124 struct irq_desc *desc = irq_to_desc(irq); 125 return desc->action != NULL; 126 } 127 128 /* caller has locked the irq_desc and both params are valid */ 129 static inline void __irq_set_handler_locked(unsigned int irq, 130 irq_flow_handler_t handler) 131 { 132 struct irq_desc *desc; 133 134 desc = irq_to_desc(irq); 135 desc->handle_irq = handler; 136 } 137 138 /* caller has locked the irq_desc and both params are valid */ 139 static inline void 140 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip, 141 irq_flow_handler_t handler, const char *name) 142 { 143 struct irq_desc *desc; 144 145 desc = irq_to_desc(irq); 146 irq_desc_get_irq_data(desc)->chip = chip; 147 desc->handle_irq = handler; 148 desc->name = name; 149 } 150 151 static inline int irq_balancing_disabled(unsigned int irq) 152 { 153 struct irq_desc *desc; 154 155 desc = irq_to_desc(irq); 156 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; 157 } 158 159 static inline int irq_is_percpu(unsigned int irq) 160 { 161 struct irq_desc *desc; 162 163 desc = irq_to_desc(irq); 164 return desc->status_use_accessors & IRQ_PER_CPU; 165 } 166 167 static inline void 168 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) 169 { 170 struct irq_desc *desc = irq_to_desc(irq); 171 172 if (desc) 173 lockdep_set_class(&desc->lock, class); 174 } 175 176 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI 177 static inline void 178 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) 179 { 180 struct irq_desc *desc; 181 182 desc = irq_to_desc(irq); 183 desc->preflow_handler = handler; 184 } 185 #endif 186 187 #endif 188