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 #include <linux/mutex.h>
   7
   8 /*
   9  * Core internal functions to deal with irq descriptors
  10  */
  11
  12 struct irq_affinity_notify;
  13 struct proc_dir_entry;
  14 struct module;
  15 struct irq_desc;
  16 struct irq_domain;
  17 struct pt_regs;
  18
  19 /**
  20  * struct irq_desc - interrupt descriptor
  21  * @irq_common_data:    per irq and chip data passed down to chip functions
  22  * @kstat_irqs:         irq stats per cpu
  23  * @handle_irq:         highlevel irq-events handler
  24  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
  25  * @action:             the irq action chain
  26  * @status:             status information
  27  * @core_internal_state__do_not_mess_with_it: core internal status information
  28  * @depth:              disable-depth, for nested irq_disable() calls
  29  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
  30  * @irq_count:          stats field to detect stalled irqs
  31  * @last_unhandled:     aging timer for unhandled count
  32  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  33  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
  34  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
  35  * @lock:               locking for SMP
  36  * @affinity_hint:      hint to user space for preferred irq affinity
  37  * @affinity_notify:    context for notification of affinity changes
  38  * @pending_mask:       pending rebalanced interrupts
  39  * @threads_oneshot:    bitfield to handle shared oneshot threads
  40  * @threads_active:     number of irqaction threads currently running
  41  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  42  * @nr_actions:         number of installed actions on this descriptor
  43  * @no_suspend_depth:   number of irqactions on a irq descriptor with
  44  *                      IRQF_NO_SUSPEND set
  45  * @force_resume_depth: number of irqactions on a irq descriptor with
  46  *                      IRQF_FORCE_RESUME set
  47  * @rcu:                rcu head for delayed free
  48  * @kobj:               kobject used to represent this struct in sysfs
  49  * @request_mutex:      mutex to protect request/free before locking desc->lock
  50  * @dir:                /proc/irq/ procfs entry
  51  * @debugfs_file:       dentry for the debugfs file
  52  * @name:               flow handler name for /proc/interrupts output
  53  */
  54 struct irq_desc {
  55         struct irq_common_data  irq_common_data;
  56         struct irq_data         irq_data;
  57         unsigned int __percpu   *kstat_irqs;
  58         irq_flow_handler_t      handle_irq;
  59 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  60         irq_preflow_handler_t   preflow_handler;
  61 #endif
  62         struct irqaction        *action;        /* IRQ action list */
  63         unsigned int            status_use_accessors;
  64         unsigned int            core_internal_state__do_not_mess_with_it;
  65         unsigned int            depth;          /* nested irq disables */
  66         unsigned int            wake_depth;     /* nested wake enables */
  67         unsigned int            irq_count;      /* For detecting broken IRQs */
  68         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  69         unsigned int            irqs_unhandled;
  70         atomic_t                threads_handled;
  71         int                     threads_handled_last;
  72         raw_spinlock_t          lock;
  73         struct cpumask          *percpu_enabled;
  74         const struct cpumask    *percpu_affinity;
  75 #ifdef CONFIG_SMP
  76         const struct cpumask    *affinity_hint;
  77         struct irq_affinity_notify *affinity_notify;
  78 #ifdef CONFIG_GENERIC_PENDING_IRQ
  79         cpumask_var_t           pending_mask;
  80 #endif
  81 #endif
  82         unsigned long           threads_oneshot;
  83         atomic_t                threads_active;
  84         wait_queue_head_t       wait_for_threads;
  85 #ifdef CONFIG_PM_SLEEP
  86         unsigned int            nr_actions;
  87         unsigned int            no_suspend_depth;
  88         unsigned int            cond_suspend_depth;
  89         unsigned int            force_resume_depth;
  90 #endif
  91 #ifdef CONFIG_PROC_FS
  92         struct proc_dir_entry   *dir;
  93 #endif
  94 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
  95         struct dentry           *debugfs_file;
  96 #endif
  97 #ifdef CONFIG_SPARSE_IRQ
  98         struct rcu_head         rcu;
  99         struct kobject          kobj;
 100 #endif
 101         struct mutex            request_mutex;
 102         int                     parent_irq;
 103         struct module           *owner;
 104         const char              *name;
 105 } ____cacheline_internodealigned_in_smp;
 106
 107 #ifdef CONFIG_SPARSE_IRQ
 108 extern void irq_lock_sparse(void);
 109 extern void irq_unlock_sparse(void);
 110 #else
 111 static inline void irq_lock_sparse(void) { }
 112 static inline void irq_unlock_sparse(void) { }
 113 extern struct irq_desc irq_desc[NR_IRQS];
 114 #endif
 115
 116 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
 117 {
 118         return container_of(data->common, struct irq_desc, irq_common_data);
 119 }
 120
 121 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
 122 {
 123         return desc->irq_data.irq;
 124 }
 125
 126 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
 127 {
 128         return &desc->irq_data;
 129 }
 130
 131 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 132 {
 133         return desc->irq_data.chip;
 134 }
 135
 136 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 137 {
 138         return desc->irq_data.chip_data;
 139 }
 140
 141 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 142 {
 143         return desc->irq_common_data.handler_data;
 144 }
 145
 146 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 147 {
 148         return desc->irq_common_data.msi_desc;
 149 }
 150
 151 /*
 152  * Architectures call this to let the generic IRQ layer
 153  * handle an interrupt.
 154  */
 155 static inline void generic_handle_irq_desc(struct irq_desc *desc)
 156 {
 157         desc->handle_irq(desc);
 158 }
 159
 160 int generic_handle_irq(unsigned int irq);
 161
 162 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 163 /*
 164  * Convert a HW interrupt number to a logical one using a IRQ domain,
 165  * and handle the result interrupt number. Return -EINVAL if
 166  * conversion failed. Providing a NULL domain indicates that the
 167  * conversion has already been done.
 168  */
 169 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 170                         bool lookup, struct pt_regs *regs);
 171
 172 static inline int handle_domain_irq(struct irq_domain *domain,
 173                                     unsigned int hwirq, struct pt_regs *regs)
 174 {
 175         return __handle_domain_irq(domain, hwirq, true, regs);
 176 }
 177 #endif
 178
 179 /* Test to see if a driver has successfully requested an irq */
 180 static inline int irq_desc_has_action(struct irq_desc *desc)
 181 {
 182         return desc->action != NULL;
 183 }
 184
 185 static inline int irq_has_action(unsigned int irq)
 186 {
 187         return irq_desc_has_action(irq_to_desc(irq));
 188 }
 189
 190 /**
 191  * irq_set_handler_locked - Set irq handler from a locked region
 192  * @data:       Pointer to the irq_data structure which identifies the irq
 193  * @handler:    Flow control handler function for this interrupt
 194  *
 195  * Sets the handler in the irq descriptor associated to @data.
 196  *
 197  * Must be called with irq_desc locked and valid parameters. Typical
 198  * call site is the irq_set_type() callback.
 199  */
 200 static inline void irq_set_handler_locked(struct irq_data *data,
 201                                           irq_flow_handler_t handler)
 202 {
 203         struct irq_desc *desc = irq_data_to_desc(data);
 204
 205         desc->handle_irq = handler;
 206 }
 207
 208 /**
 209  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
 210  * @data:       Pointer to the irq_data structure for which the chip is set
 211  * @chip:       Pointer to the new irq chip
 212  * @handler:    Flow control handler function for this interrupt
 213  * @name:       Name of the interrupt
 214  *
 215  * Replace the irq chip at the proper hierarchy level in @data and
 216  * sets the handler and name in the associated irq descriptor.
 217  *
 218  * Must be called with irq_desc locked and valid parameters.
 219  */
 220 static inline void
 221 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
 222                                  irq_flow_handler_t handler, const char *name)
 223 {
 224         struct irq_desc *desc = irq_data_to_desc(data);
 225
 226         desc->handle_irq = handler;
 227         desc->name = name;
 228         data->chip = chip;
 229 }
 230
 231 static inline int irq_balancing_disabled(unsigned int irq)
 232 {
 233         struct irq_desc *desc;
 234
 235         desc = irq_to_desc(irq);
 236         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 237 }
 238
 239 static inline int irq_is_percpu(unsigned int irq)
 240 {
 241         struct irq_desc *desc;
 242
 243         desc = irq_to_desc(irq);
 244         return desc->status_use_accessors & IRQ_PER_CPU;
 245 }
 246
 247 static inline void
 248 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 249 {
 250         struct irq_desc *desc = irq_to_desc(irq);
 251
 252         if (desc)
 253                 lockdep_set_class(&desc->lock, class);
 254 }
 255
 256 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 257 static inline void
 258 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 259 {
 260         struct irq_desc *desc;
 261
 262         desc = irq_to_desc(irq);
 263         desc->preflow_handler = handler;
 264 }
 265 #endif
 266
 267 #endif