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 11struct irq_affinity_notify; 12struct proc_dir_entry; 13struct timer_rand_state; 14struct module; 15/** 16 * struct irq_desc - interrupt descriptor 17 * @irq_data: per irq and chip data passed down to chip functions 18 * @timer_rand_state: pointer to timer rand state struct 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 * @lock: locking for SMP 31 * @affinity_hint: hint to user space for preferred irq affinity 32 * @affinity_notify: context for notification of affinity changes 33 * @pending_mask: pending rebalanced interrupts 34 * @threads_oneshot: bitfield to handle shared oneshot threads 35 * @threads_active: number of irqaction threads currently running 36 * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers 37 * @dir: /proc/irq/ procfs entry 38 * @name: flow handler name for /proc/interrupts output 39 */ 40struct irq_desc { 41 struct irq_data irq_data; 42 struct timer_rand_state *timer_rand_state; 43 unsigned int __percpu *kstat_irqs; 44 irq_flow_handler_t handle_irq; 45#ifdef CONFIG_IRQ_PREFLOW_FASTEOI 46 irq_preflow_handler_t preflow_handler; 47#endif 48 struct irqaction *action; /* IRQ action list */ 49 unsigned int status_use_accessors; 50 unsigned int core_internal_state__do_not_mess_with_it; 51 unsigned int depth; /* nested irq disables */ 52 unsigned int wake_depth; /* nested wake enables */ 53 unsigned int irq_count; /* For detecting broken IRQs */ 54 unsigned long last_unhandled; /* Aging timer for unhandled count */ 55 unsigned int irqs_unhandled; 56 raw_spinlock_t lock; 57 struct cpumask *percpu_enabled; 58#ifdef CONFIG_SMP 59 const struct cpumask *affinity_hint; 60 struct irq_affinity_notify *affinity_notify; 61#ifdef CONFIG_GENERIC_PENDING_IRQ 62 cpumask_var_t pending_mask; 63#endif 64#endif 65 unsigned long threads_oneshot; 66 atomic_t threads_active; 67 wait_queue_head_t wait_for_threads; 68#ifdef CONFIG_PROC_FS 69 struct proc_dir_entry *dir; 70#endif 71 struct module *owner; 72 const char *name; 73} ____cacheline_internodealigned_in_smp; 74 75#ifndef CONFIG_SPARSE_IRQ 76extern struct irq_desc irq_desc[NR_IRQS]; 77#endif 78 79#ifdef CONFIG_GENERIC_HARDIRQS 80 81static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc) 82{ 83 return &desc->irq_data; 84} 85 86static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc) 87{ 88 return desc->irq_data.chip; 89} 90 91static inline void *irq_desc_get_chip_data(struct irq_desc *desc) 92{ 93 return desc->irq_data.chip_data; 94} 95 96static inline void *irq_desc_get_handler_data(struct irq_desc *desc) 97{ 98 return desc->irq_data.handler_data; 99} 100 101static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc) 102{ 103 return desc->irq_data.msi_desc; 104} 105 106/* 107 * Architectures call this to let the generic IRQ layer 108 * handle an interrupt. If the descriptor is attached to an 109 * irqchip-style controller then we call the ->handle_irq() handler, 110 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 111 */ 112static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) 113{ 114 desc->handle_irq(irq, desc); 115} 116 117int generic_handle_irq(unsigned int irq); 118 119/* Test to see if a driver has successfully requested an irq */ 120static inline int irq_has_action(unsigned int irq) 121{ 122 struct irq_desc *desc = irq_to_desc(irq); 123 return desc->action != NULL; 124} 125 126/* caller has locked the irq_desc and both params are valid */ 127static inline void __irq_set_handler_locked(unsigned int irq, 128 irq_flow_handler_t handler) 129{ 130 struct irq_desc *desc; 131 132 desc = irq_to_desc(irq); 133 desc->handle_irq = handler; 134} 135 136/* caller has locked the irq_desc and both params are valid */ 137static inline void 138__irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip, 139 irq_flow_handler_t handler, const char *name) 140{ 141 struct irq_desc *desc; 142 143 desc = irq_to_desc(irq); 144 irq_desc_get_irq_data(desc)->chip = chip; 145 desc->handle_irq = handler; 146 desc->name = name; 147} 148 149static inline int irq_balancing_disabled(unsigned int irq) 150{ 151 struct irq_desc *desc; 152 153 desc = irq_to_desc(irq); 154 return desc->status_use_accessors & IRQ_NO_BALANCING_MASK; 155} 156 157static inline void 158irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class) 159{ 160 struct irq_desc *desc = irq_to_desc(irq); 161 162 if (desc) 163 lockdep_set_class(&desc->lock, class); 164} 165 166#ifdef CONFIG_IRQ_PREFLOW_FASTEOI 167static inline void 168__irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler) 169{ 170 struct irq_desc *desc; 171 172 desc = irq_to_desc(irq); 173 desc->preflow_handler = handler; 174} 175#endif 176#endif 177 178#endif 179