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
   8 struct irq_affinity_notify;
   9 struct proc_dir_entry;
  10 struct module;
  11 struct irq_desc;
  12 struct irq_domain;
  13 struct pt_regs;
  14
  15 /**
  16  * struct irq_desc - interrupt descriptor
  17  * @irq_common_data:    per irq and chip data passed down to chip functions
  18  * @kstat_irqs:         irq stats per cpu
  19  * @handle_irq:         highlevel irq-events handler
  20  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
  21  * @action:             the irq action chain
  22  * @status:             status information
  23  * @core_internal_state__do_not_mess_with_it: core internal status information
  24  * @depth:              disable-depth, for nested irq_disable() calls
  25  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
  26  * @irq_count:          stats field to detect stalled irqs
  27  * @last_unhandled:     aging timer for unhandled count
  28  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  29  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
  30  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
  31  * @lock:               locking for SMP
  32  * @affinity_hint:      hint to user space for preferred irq affinity
  33  * @affinity_notify:    context for notification of affinity changes
  34  * @pending_mask:       pending rebalanced interrupts
  35  * @threads_oneshot:    bitfield to handle shared oneshot threads
  36  * @threads_active:     number of irqaction threads currently running
  37  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  38  * @nr_actions:         number of installed actions on this descriptor
  39  * @no_suspend_depth:   number of irqactions on a irq descriptor with
  40  *                      IRQF_NO_SUSPEND set
  41  * @force_resume_depth: number of irqactions on a irq descriptor with
  42  *                      IRQF_FORCE_RESUME set
  43  * @dir:                /proc/irq/ procfs entry
  44  * @name:               flow handler name for /proc/interrupts output
  45  */
  46 struct irq_desc {
  47         struct irq_common_data  irq_common_data;
  48         struct irq_data         irq_data;
  49         unsigned int __percpu   *kstat_irqs;
  50         irq_flow_handler_t      handle_irq;
  51 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  52         irq_preflow_handler_t   preflow_handler;
  53 #endif
  54         struct irqaction        *action;        /* IRQ action list */
  55         unsigned int            status_use_accessors;
  56         unsigned int            core_internal_state__do_not_mess_with_it;
  57         unsigned int            depth;          /* nested irq disables */
  58         unsigned int            wake_depth;     /* nested wake enables */
  59         unsigned int            irq_count;      /* For detecting broken IRQs */
  60         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  61         unsigned int            irqs_unhandled;
  62         atomic_t                threads_handled;
  63         int                     threads_handled_last;
  64         raw_spinlock_t          lock;
  65         struct cpumask          *percpu_enabled;
  66 #ifdef CONFIG_SMP
  67         const struct cpumask    *affinity_hint;
  68         struct irq_affinity_notify *affinity_notify;
  69 #ifdef CONFIG_GENERIC_PENDING_IRQ
  70         cpumask_var_t           pending_mask;
  71 #endif
  72 #endif
  73         unsigned long           threads_oneshot;
  74         atomic_t                threads_active;
  75         wait_queue_head_t       wait_for_threads;
  76 #ifdef CONFIG_PM_SLEEP
  77         unsigned int            nr_actions;
  78         unsigned int            no_suspend_depth;
  79         unsigned int            cond_suspend_depth;
  80         unsigned int            force_resume_depth;
  81 #endif
  82 #ifdef CONFIG_PROC_FS
  83         struct proc_dir_entry   *dir;
  84 #endif
  85         int                     parent_irq;
  86         struct module           *owner;
  87         const char              *name;
  88 } ____cacheline_internodealigned_in_smp;
  89
  90 #ifdef CONFIG_SPARSE_IRQ
  91 extern void irq_lock_sparse(void);
  92 extern void irq_unlock_sparse(void);
  93 #else
  94 static inline void irq_lock_sparse(void) { }
  95 static inline void irq_unlock_sparse(void) { }
  96 extern struct irq_desc irq_desc[NR_IRQS];
  97 #endif
  98
  99 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
 100 {
 101         return container_of(data->common, struct irq_desc, irq_common_data);
 102 }
 103
 104 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
 105 {
 106         return desc->irq_data.irq;
 107 }
 108
 109 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
 110 {
 111         return &desc->irq_data;
 112 }
 113
 114 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 115 {
 116         return desc->irq_data.chip;
 117 }
 118
 119 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 120 {
 121         return desc->irq_data.chip_data;
 122 }
 123
 124 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 125 {
 126         return desc->irq_common_data.handler_data;
 127 }
 128
 129 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 130 {
 131         return desc->irq_common_data.msi_desc;
 132 }
 133
 134 /*
 135  * Architectures call this to let the generic IRQ layer
 136  * handle an interrupt.
 137  */
 138 static inline void generic_handle_irq_desc(struct irq_desc *desc)
 139 {
 140         desc->handle_irq(desc);
 141 }
 142
 143 int generic_handle_irq(unsigned int irq);
 144
 145 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 146 /*
 147  * Convert a HW interrupt number to a logical one using a IRQ domain,
 148  * and handle the result interrupt number. Return -EINVAL if
 149  * conversion failed. Providing a NULL domain indicates that the
 150  * conversion has already been done.
 151  */
 152 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 153                         bool lookup, struct pt_regs *regs);
 154
 155 static inline int handle_domain_irq(struct irq_domain *domain,
 156                                     unsigned int hwirq, struct pt_regs *regs)
 157 {
 158         return __handle_domain_irq(domain, hwirq, true, regs);
 159 }
 160 #endif
 161
 162 /* Test to see if a driver has successfully requested an irq */
 163 static inline int irq_desc_has_action(struct irq_desc *desc)
 164 {
 165         return desc->action != NULL;
 166 }
 167
 168 static inline int irq_has_action(unsigned int irq)
 169 {
 170         return irq_desc_has_action(irq_to_desc(irq));
 171 }
 172
 173 /**
 174  * irq_set_handler_locked - Set irq handler from a locked region
 175  * @data:       Pointer to the irq_data structure which identifies the irq
 176  * @handler:    Flow control handler function for this interrupt
 177  *
 178  * Sets the handler in the irq descriptor associated to @data.
 179  *
 180  * Must be called with irq_desc locked and valid parameters. Typical
 181  * call site is the irq_set_type() callback.
 182  */
 183 static inline void irq_set_handler_locked(struct irq_data *data,
 184                                           irq_flow_handler_t handler)
 185 {
 186         struct irq_desc *desc = irq_data_to_desc(data);
 187
 188         desc->handle_irq = handler;
 189 }
 190
 191 /**
 192  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
 193  * @data:       Pointer to the irq_data structure for which the chip is set
 194  * @chip:       Pointer to the new irq chip
 195  * @handler:    Flow control handler function for this interrupt
 196  * @name:       Name of the interrupt
 197  *
 198  * Replace the irq chip at the proper hierarchy level in @data and
 199  * sets the handler and name in the associated irq descriptor.
 200  *
 201  * Must be called with irq_desc locked and valid parameters.
 202  */
 203 static inline void
 204 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
 205                                  irq_flow_handler_t handler, const char *name)
 206 {
 207         struct irq_desc *desc = irq_data_to_desc(data);
 208
 209         desc->handle_irq = handler;
 210         desc->name = name;
 211         data->chip = chip;
 212 }
 213
 214 static inline int irq_balancing_disabled(unsigned int irq)
 215 {
 216         struct irq_desc *desc;
 217
 218         desc = irq_to_desc(irq);
 219         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 220 }
 221
 222 static inline int irq_is_percpu(unsigned int irq)
 223 {
 224         struct irq_desc *desc;
 225
 226         desc = irq_to_desc(irq);
 227         return desc->status_use_accessors & IRQ_PER_CPU;
 228 }
 229
 230 static inline void
 231 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 232 {
 233         struct irq_desc *desc = irq_to_desc(irq);
 234
 235         if (desc)
 236                 lockdep_set_class(&desc->lock, class);
 237 }
 238
 239 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 240 static inline void
 241 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 242 {
 243         struct irq_desc *desc;
 244
 245         desc = irq_to_desc(irq);
 246         desc->preflow_handler = handler;
 247 }
 248 #endif
 249
 250 #endif