include/linux/irqdesc.h

   1 #ifndef _LINUX_IRQDESC_H
   2 #define _LINUX_IRQDESC_H
   3
   4 #include <linux/rcupdate.h>
   5 #include <linux/kobject.h>
   6
   7 /*
   8  * Core internal functions to deal with irq descriptors
   9  */
  10
  11 struct irq_affinity_notify;
  12 struct proc_dir_entry;
  13 struct module;
  14 struct irq_desc;
  15 struct irq_domain;
  16 struct pt_regs;
  17
  18 /**
  19  * struct irq_desc - interrupt descriptor
  20  * @irq_common_data:    per irq and chip data passed down to chip functions
  21  * @kstat_irqs:         irq stats per cpu
  22  * @handle_irq:         highlevel irq-events handler
  23  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
  24  * @action:             the irq action chain
  25  * @status:             status information
  26  * @core_internal_state__do_not_mess_with_it: core internal status information
  27  * @depth:              disable-depth, for nested irq_disable() calls
  28  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
  29  * @irq_count:          stats field to detect stalled irqs
  30  * @last_unhandled:     aging timer for unhandled count
  31  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  32  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
  33  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
  34  * @lock:               locking for SMP
  35  * @affinity_hint:      hint to user space for preferred irq affinity
  36  * @affinity_notify:    context for notification of affinity changes
  37  * @pending_mask:       pending rebalanced interrupts
  38  * @threads_oneshot:    bitfield to handle shared oneshot threads
  39  * @threads_active:     number of irqaction threads currently running
  40  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  41  * @nr_actions:         number of installed actions on this descriptor
  42  * @no_suspend_depth:   number of irqactions on a irq descriptor with
  43  *                      IRQF_NO_SUSPEND set
  44  * @force_resume_depth: number of irqactions on a irq descriptor with
  45  *                      IRQF_FORCE_RESUME set
  46  * @rcu:                rcu head for delayed free
  47  * @kobj:               kobject used to represent this struct in sysfs
  48  * @dir:                /proc/irq/ procfs entry
  49  * @name:               flow handler name for /proc/interrupts output
  50  */
  51 struct irq_desc {
  52         struct irq_common_data  irq_common_data;
  53         struct irq_data         irq_data;
  54         unsigned int __percpu   *kstat_irqs;
  55         irq_flow_handler_t      handle_irq;
  56 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  57         irq_preflow_handler_t   preflow_handler;
  58 #endif
  59         struct irqaction        *action;        /* IRQ action list */
  60         unsigned int            status_use_accessors;
  61         unsigned int            core_internal_state__do_not_mess_with_it;
  62         unsigned int            depth;          /* nested irq disables */
  63         unsigned int            wake_depth;     /* nested wake enables */
  64         unsigned int            irq_count;      /* For detecting broken IRQs */
  65         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  66         unsigned int            irqs_unhandled;
  67         atomic_t                threads_handled;
  68         int                     threads_handled_last;
  69         raw_spinlock_t          lock;
  70         struct cpumask          *percpu_enabled;
  71         const struct cpumask    *percpu_affinity;
  72 #ifdef CONFIG_SMP
  73         const struct cpumask    *affinity_hint;
  74         struct irq_affinity_notify *affinity_notify;
  75 #ifdef CONFIG_GENERIC_PENDING_IRQ
  76         cpumask_var_t           pending_mask;
  77 #endif
  78 #endif
  79         unsigned long           threads_oneshot;
  80         atomic_t                threads_active;
  81         wait_queue_head_t       wait_for_threads;
  82 #ifdef CONFIG_PM_SLEEP
  83         unsigned int            nr_actions;
  84         unsigned int            no_suspend_depth;
  85         unsigned int            cond_suspend_depth;
  86         unsigned int            force_resume_depth;
  87 #endif
  88 #ifdef CONFIG_PROC_FS
  89         struct proc_dir_entry   *dir;
  90 #endif
  91 #ifdef CONFIG_SPARSE_IRQ
  92         struct rcu_head         rcu;
  93         struct kobject          kobj;
  94 #endif
  95         int                     parent_irq;
  96         struct module           *owner;
  97         const char              *name;
  98 } ____cacheline_internodealigned_in_smp;
  99
 100 #ifdef CONFIG_SPARSE_IRQ
 101 extern void irq_lock_sparse(void);
 102 extern void irq_unlock_sparse(void);
 103 #else
 104 static inline void irq_lock_sparse(void) { }
 105 static inline void irq_unlock_sparse(void) { }
 106 extern struct irq_desc irq_desc[NR_IRQS];
 107 #endif
 108
 109 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
 110 {
 111         return container_of(data->common, struct irq_desc, irq_common_data);
 112 }
 113
 114 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
 115 {
 116         return desc->irq_data.irq;
 117 }
 118
 119 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
 120 {
 121         return &desc->irq_data;
 122 }
 123
 124 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 125 {
 126         return desc->irq_data.chip;
 127 }
 128
 129 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 130 {
 131         return desc->irq_data.chip_data;
 132 }
 133
 134 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 135 {
 136         return desc->irq_common_data.handler_data;
 137 }
 138
 139 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 140 {
 141         return desc->irq_common_data.msi_desc;
 142 }
 143
 144 /*
 145  * Architectures call this to let the generic IRQ layer
 146  * handle an interrupt.
 147  */
 148 static inline void generic_handle_irq_desc(struct irq_desc *desc)
 149 {
 150         desc->handle_irq(desc);
 151 }
 152
 153 int generic_handle_irq(unsigned int irq);
 154
 155 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 156 /*
 157  * Convert a HW interrupt number to a logical one using a IRQ domain,
 158  * and handle the result interrupt number. Return -EINVAL if
 159  * conversion failed. Providing a NULL domain indicates that the
 160  * conversion has already been done.
 161  */
 162 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 163                         bool lookup, struct pt_regs *regs);
 164
 165 static inline int handle_domain_irq(struct irq_domain *domain,
 166                                     unsigned int hwirq, struct pt_regs *regs)
 167 {
 168         return __handle_domain_irq(domain, hwirq, true, regs);
 169 }
 170 #endif
 171
 172 /* Test to see if a driver has successfully requested an irq */
 173 static inline int irq_desc_has_action(struct irq_desc *desc)
 174 {
 175         return desc->action != NULL;
 176 }
 177
 178 static inline int irq_has_action(unsigned int irq)
 179 {
 180         return irq_desc_has_action(irq_to_desc(irq));
 181 }
 182
 183 /**
 184  * irq_set_handler_locked - Set irq handler from a locked region
 185  * @data:       Pointer to the irq_data structure which identifies the irq
 186  * @handler:    Flow control handler function for this interrupt
 187  *
 188  * Sets the handler in the irq descriptor associated to @data.
 189  *
 190  * Must be called with irq_desc locked and valid parameters. Typical
 191  * call site is the irq_set_type() callback.
 192  */
 193 static inline void irq_set_handler_locked(struct irq_data *data,
 194                                           irq_flow_handler_t handler)
 195 {
 196         struct irq_desc *desc = irq_data_to_desc(data);
 197
 198         desc->handle_irq = handler;
 199 }
 200
 201 /**
 202  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
 203  * @data:       Pointer to the irq_data structure for which the chip is set
 204  * @chip:       Pointer to the new irq chip
 205  * @handler:    Flow control handler function for this interrupt
 206  * @name:       Name of the interrupt
 207  *
 208  * Replace the irq chip at the proper hierarchy level in @data and
 209  * sets the handler and name in the associated irq descriptor.
 210  *
 211  * Must be called with irq_desc locked and valid parameters.
 212  */
 213 static inline void
 214 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
 215                                  irq_flow_handler_t handler, const char *name)
 216 {
 217         struct irq_desc *desc = irq_data_to_desc(data);
 218
 219         desc->handle_irq = handler;
 220         desc->name = name;
 221         data->chip = chip;
 222 }
 223
 224 static inline int irq_balancing_disabled(unsigned int irq)
 225 {
 226         struct irq_desc *desc;
 227
 228         desc = irq_to_desc(irq);
 229         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 230 }
 231
 232 static inline int irq_is_percpu(unsigned int irq)
 233 {
 234         struct irq_desc *desc;
 235
 236         desc = irq_to_desc(irq);
 237         return desc->status_use_accessors & IRQ_PER_CPU;
 238 }
 239
 240 static inline void
 241 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 242 {
 243         struct irq_desc *desc = irq_to_desc(irq);
 244
 245         if (desc)
 246                 lockdep_set_class(&desc->lock, class);
 247 }
 248
 249 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 250 static inline void
 251 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 252 {
 253         struct irq_desc *desc;
 254
 255         desc = irq_to_desc(irq);
 256         desc->preflow_handler = handler;
 257 }
 258 #endif
 259
 260 #endif