include/linux/irqdesc.h

   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 timer_rand_state;
  14 /**
  15  * struct irq_desc - interrupt descriptor
  16  * @irq_data:           per irq and chip data passed down to chip functions
  17  * @timer_rand_state:   pointer to timer rand state struct
  18  * @kstat_irqs:         irq stats per cpu
  19  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
  20  * @action:             the irq action chain
  21  * @status:             status information
  22  * @core_internal_state__do_not_mess_with_it: core internal status information
  23  * @depth:              disable-depth, for nested irq_disable() calls
  24  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
  25  * @irq_count:          stats field to detect stalled irqs
  26  * @last_unhandled:     aging timer for unhandled count
  27  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  28  * @lock:               locking for SMP
  29  * @affinity_notify:    context for notification of affinity changes
  30  * @pending_mask:       pending rebalanced interrupts
  31  * @threads_oneshot:    bitfield to handle shared oneshot threads
  32  * @threads_active:     number of irqaction threads currently running
  33  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  34  * @dir:                /proc/irq/ procfs entry
  35  * @name:               flow handler name for /proc/interrupts output
  36  */
  37 struct irq_desc {
  38
  39 #ifdef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
  40         struct irq_data         irq_data;
  41 #else
  42         /*
  43          * This union will go away, once we fixed the direct access to
  44          * irq_desc all over the place. The direct fields are a 1:1
  45          * overlay of irq_data.
  46          */
  47         union {
  48                 struct irq_data         irq_data;
  49                 struct {
  50                         unsigned int            irq;
  51                         unsigned int            node;
  52                         unsigned int            pad_do_not_even_think_about_it;
  53                         struct irq_chip         *chip;
  54                         void                    *handler_data;
  55                         void                    *chip_data;
  56                         struct msi_desc         *msi_desc;
  57 #ifdef CONFIG_SMP
  58                         cpumask_var_t           affinity;
  59 #endif
  60                 };
  61         };
  62 #endif
  63
  64         struct timer_rand_state *timer_rand_state;
  65         unsigned int __percpu   *kstat_irqs;
  66         irq_flow_handler_t      handle_irq;
  67 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  68         irq_preflow_handler_t   preflow_handler;
  69 #endif
  70         struct irqaction        *action;        /* IRQ action list */
  71 #ifdef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
  72         unsigned int            status_use_accessors;
  73 #else
  74         unsigned int            status;         /* IRQ status */
  75 #endif
  76         unsigned int            core_internal_state__do_not_mess_with_it;
  77         unsigned int            depth;          /* nested irq disables */
  78         unsigned int            wake_depth;     /* nested wake enables */
  79         unsigned int            irq_count;      /* For detecting broken IRQs */
  80         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  81         unsigned int            irqs_unhandled;
  82         raw_spinlock_t          lock;
  83 #ifdef CONFIG_SMP
  84         const struct cpumask    *affinity_hint;
  85         struct irq_affinity_notify *affinity_notify;
  86 #ifdef CONFIG_GENERIC_PENDING_IRQ
  87         cpumask_var_t           pending_mask;
  88 #endif
  89 #endif
  90         unsigned long           threads_oneshot;
  91         atomic_t                threads_active;
  92         wait_queue_head_t       wait_for_threads;
  93 #ifdef CONFIG_PROC_FS
  94         struct proc_dir_entry   *dir;
  95 #endif
  96         const char              *name;
  97 } ____cacheline_internodealigned_in_smp;
  98
  99 #ifndef CONFIG_SPARSE_IRQ
 100 extern struct irq_desc irq_desc[NR_IRQS];
 101 #endif
 102
 103 #ifdef CONFIG_GENERIC_HARDIRQS
 104
 105 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
 106 {
 107         return &desc->irq_data;
 108 }
 109
 110 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 111 {
 112         return desc->irq_data.chip;
 113 }
 114
 115 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 116 {
 117         return desc->irq_data.chip_data;
 118 }
 119
 120 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 121 {
 122         return desc->irq_data.handler_data;
 123 }
 124
 125 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 126 {
 127         return desc->irq_data.msi_desc;
 128 }
 129
 130 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
 131 static inline struct irq_chip *get_irq_desc_chip(struct irq_desc *desc)
 132 {
 133         return irq_desc_get_chip(desc);
 134 }
 135 static inline void *get_irq_desc_data(struct irq_desc *desc)
 136 {
 137         return irq_desc_get_handler_data(desc);
 138 }
 139
 140 static inline void *get_irq_desc_chip_data(struct irq_desc *desc)
 141 {
 142         return irq_desc_get_chip_data(desc);
 143 }
 144
 145 static inline struct msi_desc *get_irq_desc_msi(struct irq_desc *desc)
 146 {
 147         return irq_desc_get_msi_desc(desc);
 148 }
 149 #endif
 150
 151 /*
 152  * Architectures call this to let the generic IRQ layer
 153  * handle an interrupt. If the descriptor is attached to an
 154  * irqchip-style controller then we call the ->handle_irq() handler,
 155  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 156  */
 157 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 158 {
 159         desc->handle_irq(irq, desc);
 160 }
 161
 162 static inline void generic_handle_irq(unsigned int irq)
 163 {
 164         generic_handle_irq_desc(irq, irq_to_desc(irq));
 165 }
 166
 167 /* Test to see if a driver has successfully requested an irq */
 168 static inline int irq_has_action(unsigned int irq)
 169 {
 170         struct irq_desc *desc = irq_to_desc(irq);
 171         return desc->action != NULL;
 172 }
 173
 174 /* caller has locked the irq_desc and both params are valid */
 175 static inline void __irq_set_handler_locked(unsigned int irq,
 176                                             irq_flow_handler_t handler)
 177 {
 178         struct irq_desc *desc;
 179
 180         desc = irq_to_desc(irq);
 181         desc->handle_irq = handler;
 182 }
 183
 184 /* caller has locked the irq_desc and both params are valid */
 185 static inline void
 186 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
 187                                    irq_flow_handler_t handler, const char *name)
 188 {
 189         struct irq_desc *desc;
 190
 191         desc = irq_to_desc(irq);
 192         irq_desc_get_irq_data(desc)->chip = chip;
 193         desc->handle_irq = handler;
 194         desc->name = name;
 195 }
 196
 197 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
 198 static inline void __set_irq_handler_unlocked(int irq,
 199                                               irq_flow_handler_t handler)
 200 {
 201         __irq_set_handler_locked(irq, handler);
 202 }
 203
 204 static inline int irq_balancing_disabled(unsigned int irq)
 205 {
 206         struct irq_desc *desc;
 207
 208         desc = irq_to_desc(irq);
 209         return desc->status & IRQ_NO_BALANCING_MASK;
 210 }
 211 #endif
 212
 213 static inline void
 214 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 215 {
 216         struct irq_desc *desc = irq_to_desc(irq);
 217
 218         if (desc)
 219                 lockdep_set_class(&desc->lock, class);
 220 }
 221
 222 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 223 static inline void
 224 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 225 {
 226         struct irq_desc *desc;
 227
 228         desc = irq_to_desc(irq);
 229         desc->preflow_handler = handler;
 230 }
 231 #endif
 232 #endif
 233
 234 #endif