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 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 102         return irq_to_desc(data->irq);
 103 #else
 104         return container_of(data, struct irq_desc, irq_data);
 105 #endif
 106 }
 107
 108 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
 109 {
 110         return desc->irq_data.irq;
 111 }
 112
 113 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
 114 {
 115         return &desc->irq_data;
 116 }
 117
 118 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 119 {
 120         return desc->irq_data.chip;
 121 }
 122
 123 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 124 {
 125         return desc->irq_data.chip_data;
 126 }
 127
 128 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 129 {
 130         return desc->irq_data.handler_data;
 131 }
 132
 133 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 134 {
 135         return desc->irq_data.msi_desc;
 136 }
 137
 138 /*
 139  * Architectures call this to let the generic IRQ layer
 140  * handle an interrupt. If the descriptor is attached to an
 141  * irqchip-style controller then we call the ->handle_irq() handler,
 142  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 143  */
 144 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
 145 {
 146         desc->handle_irq(irq, desc);
 147 }
 148
 149 int generic_handle_irq(unsigned int irq);
 150
 151 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 152 /*
 153  * Convert a HW interrupt number to a logical one using a IRQ domain,
 154  * and handle the result interrupt number. Return -EINVAL if
 155  * conversion failed. Providing a NULL domain indicates that the
 156  * conversion has already been done.
 157  */
 158 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 159                         bool lookup, struct pt_regs *regs);
 160
 161 static inline int handle_domain_irq(struct irq_domain *domain,
 162                                     unsigned int hwirq, struct pt_regs *regs)
 163 {
 164         return __handle_domain_irq(domain, hwirq, true, regs);
 165 }
 166 #endif
 167
 168 /* Test to see if a driver has successfully requested an irq */
 169 static inline int irq_desc_has_action(struct irq_desc *desc)
 170 {
 171         return desc->action != NULL;
 172 }
 173
 174 static inline int irq_has_action(unsigned int irq)
 175 {
 176         return irq_desc_has_action(irq_to_desc(irq));
 177 }
 178
 179 /* caller has locked the irq_desc and both params are valid */
 180 static inline void __irq_set_handler_locked(unsigned int irq,
 181                                             irq_flow_handler_t handler)
 182 {
 183         struct irq_desc *desc;
 184
 185         desc = irq_to_desc(irq);
 186         desc->handle_irq = handler;
 187 }
 188
 189 /* caller has locked the irq_desc and both params are valid */
 190 static inline void
 191 __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
 192                                    irq_flow_handler_t handler, const char *name)
 193 {
 194         struct irq_desc *desc;
 195
 196         desc = irq_to_desc(irq);
 197         irq_desc_get_irq_data(desc)->chip = chip;
 198         desc->handle_irq = handler;
 199         desc->name = name;
 200 }
 201
 202 /**
 203  * irq_set_handler_locked - Set irq handler from a locked region
 204  * @data:       Pointer to the irq_data structure which identifies the irq
 205  * @handler:    Flow control handler function for this interrupt
 206  *
 207  * Sets the handler in the irq descriptor associated to @data.
 208  *
 209  * Must be called with irq_desc locked and valid parameters. Typical
 210  * call site is the irq_set_type() callback.
 211  */
 212 static inline void irq_set_handler_locked(struct irq_data *data,
 213                                           irq_flow_handler_t handler)
 214 {
 215         struct irq_desc *desc = irq_data_to_desc(data);
 216
 217         desc->handle_irq = handler;
 218 }
 219
 220 /**
 221  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
 222  * @data:       Pointer to the irq_data structure for which the chip is set
 223  * @chip:       Pointer to the new irq chip
 224  * @handler:    Flow control handler function for this interrupt
 225  * @name:       Name of the interrupt
 226  *
 227  * Replace the irq chip at the proper hierarchy level in @data and
 228  * sets the handler and name in the associated irq descriptor.
 229  *
 230  * Must be called with irq_desc locked and valid parameters.
 231  */
 232 static inline void
 233 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
 234                                  irq_flow_handler_t handler, const char *name)
 235 {
 236         struct irq_desc *desc = irq_data_to_desc(data);
 237
 238         desc->handle_irq = handler;
 239         desc->name = name;
 240         data->chip = chip;
 241 }
 242
 243 static inline int irq_balancing_disabled(unsigned int irq)
 244 {
 245         struct irq_desc *desc;
 246
 247         desc = irq_to_desc(irq);
 248         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 249 }
 250
 251 static inline int irq_is_percpu(unsigned int irq)
 252 {
 253         struct irq_desc *desc;
 254
 255         desc = irq_to_desc(irq);
 256         return desc->status_use_accessors & IRQ_PER_CPU;
 257 }
 258
 259 static inline void
 260 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 261 {
 262         struct irq_desc *desc = irq_to_desc(irq);
 263
 264         if (desc)
 265                 lockdep_set_class(&desc->lock, class);
 266 }
 267
 268 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 269 static inline void
 270 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 271 {
 272         struct irq_desc *desc;
 273
 274         desc = irq_to_desc(irq);
 275         desc->preflow_handler = handler;
 276 }
 277 #endif
 278
 279 #endif