include/linux/irqdesc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_IRQDESC_H
   3 #define _LINUX_IRQDESC_H
   4
   5 #include <linux/rcupdate.h>
   6 #include <linux/kobject.h>
   7 #include <linux/mutex.h>
   8
   9 /*
  10  * Core internal functions to deal with irq descriptors
  11  */
  12
  13 struct irq_affinity_notify;
  14 struct proc_dir_entry;
  15 struct module;
  16 struct irq_desc;
  17 struct irq_domain;
  18 struct pt_regs;
  19
  20 /**
  21  * struct irq_desc - interrupt descriptor
  22  * @irq_common_data:    per irq and chip data passed down to chip functions
  23  * @kstat_irqs:         irq stats per cpu
  24  * @handle_irq:         highlevel irq-events handler
  25  * @preflow_handler:    handler called before the flow handler (currently used by sparc)
  26  * @action:             the irq action chain
  27  * @status:             status information
  28  * @core_internal_state__do_not_mess_with_it: core internal status information
  29  * @depth:              disable-depth, for nested irq_disable() calls
  30  * @wake_depth:         enable depth, for multiple irq_set_irq_wake() callers
  31  * @irq_count:          stats field to detect stalled irqs
  32  * @last_unhandled:     aging timer for unhandled count
  33  * @irqs_unhandled:     stats field for spurious unhandled interrupts
  34  * @threads_handled:    stats field for deferred spurious detection of threaded handlers
  35  * @threads_handled_last: comparator field for deferred spurious detection of theraded handlers
  36  * @lock:               locking for SMP
  37  * @affinity_hint:      hint to user space for preferred irq affinity
  38  * @affinity_notify:    context for notification of affinity changes
  39  * @pending_mask:       pending rebalanced interrupts
  40  * @threads_oneshot:    bitfield to handle shared oneshot threads
  41  * @threads_active:     number of irqaction threads currently running
  42  * @wait_for_threads:   wait queue for sync_irq to wait for threaded handlers
  43  * @nr_actions:         number of installed actions on this descriptor
  44  * @no_suspend_depth:   number of irqactions on a irq descriptor with
  45  *                      IRQF_NO_SUSPEND set
  46  * @force_resume_depth: number of irqactions on a irq descriptor with
  47  *                      IRQF_FORCE_RESUME set
  48  * @rcu:                rcu head for delayed free
  49  * @kobj:               kobject used to represent this struct in sysfs
  50  * @request_mutex:      mutex to protect request/free before locking desc->lock
  51  * @dir:                /proc/irq/ procfs entry
  52  * @debugfs_file:       dentry for the debugfs file
  53  * @name:               flow handler name for /proc/interrupts output
  54  */
  55 struct irq_desc {
  56         struct irq_common_data  irq_common_data;
  57         struct irq_data         irq_data;
  58         unsigned int __percpu   *kstat_irqs;
  59         irq_flow_handler_t      handle_irq;
  60 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
  61         irq_preflow_handler_t   preflow_handler;
  62 #endif
  63         struct irqaction        *action;        /* IRQ action list */
  64         unsigned int            status_use_accessors;
  65         unsigned int            core_internal_state__do_not_mess_with_it;
  66         unsigned int            depth;          /* nested irq disables */
  67         unsigned int            wake_depth;     /* nested wake enables */
  68         unsigned int            irq_count;      /* For detecting broken IRQs */
  69         unsigned long           last_unhandled; /* Aging timer for unhandled count */
  70         unsigned int            irqs_unhandled;
  71         atomic_t                threads_handled;
  72         int                     threads_handled_last;
  73         raw_spinlock_t          lock;
  74         struct cpumask          *percpu_enabled;
  75         const struct cpumask    *percpu_affinity;
  76 #ifdef CONFIG_SMP
  77         const struct cpumask    *affinity_hint;
  78         struct irq_affinity_notify *affinity_notify;
  79 #ifdef CONFIG_GENERIC_PENDING_IRQ
  80         cpumask_var_t           pending_mask;
  81 #endif
  82 #endif
  83         unsigned long           threads_oneshot;
  84         atomic_t                threads_active;
  85         wait_queue_head_t       wait_for_threads;
  86 #ifdef CONFIG_PM_SLEEP
  87         unsigned int            nr_actions;
  88         unsigned int            no_suspend_depth;
  89         unsigned int            cond_suspend_depth;
  90         unsigned int            force_resume_depth;
  91 #endif
  92 #ifdef CONFIG_PROC_FS
  93         struct proc_dir_entry   *dir;
  94 #endif
  95 #ifdef CONFIG_GENERIC_IRQ_DEBUGFS
  96         struct dentry           *debugfs_file;
  97 #endif
  98 #ifdef CONFIG_SPARSE_IRQ
  99         struct rcu_head         rcu;
 100         struct kobject          kobj;
 101 #endif
 102         struct mutex            request_mutex;
 103         int                     parent_irq;
 104         struct module           *owner;
 105         const char              *name;
 106 } ____cacheline_internodealigned_in_smp;
 107
 108 #ifdef CONFIG_SPARSE_IRQ
 109 extern void irq_lock_sparse(void);
 110 extern void irq_unlock_sparse(void);
 111 #else
 112 static inline void irq_lock_sparse(void) { }
 113 static inline void irq_unlock_sparse(void) { }
 114 extern struct irq_desc irq_desc[NR_IRQS];
 115 #endif
 116
 117 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
 118 {
 119         return container_of(data->common, struct irq_desc, irq_common_data);
 120 }
 121
 122 static inline unsigned int irq_desc_get_irq(struct irq_desc *desc)
 123 {
 124         return desc->irq_data.irq;
 125 }
 126
 127 static inline struct irq_data *irq_desc_get_irq_data(struct irq_desc *desc)
 128 {
 129         return &desc->irq_data;
 130 }
 131
 132 static inline struct irq_chip *irq_desc_get_chip(struct irq_desc *desc)
 133 {
 134         return desc->irq_data.chip;
 135 }
 136
 137 static inline void *irq_desc_get_chip_data(struct irq_desc *desc)
 138 {
 139         return desc->irq_data.chip_data;
 140 }
 141
 142 static inline void *irq_desc_get_handler_data(struct irq_desc *desc)
 143 {
 144         return desc->irq_common_data.handler_data;
 145 }
 146
 147 static inline struct msi_desc *irq_desc_get_msi_desc(struct irq_desc *desc)
 148 {
 149         return desc->irq_common_data.msi_desc;
 150 }
 151
 152 /*
 153  * Architectures call this to let the generic IRQ layer
 154  * handle an interrupt.
 155  */
 156 static inline void generic_handle_irq_desc(struct irq_desc *desc)
 157 {
 158         desc->handle_irq(desc);
 159 }
 160
 161 int generic_handle_irq(unsigned int irq);
 162
 163 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 164 /*
 165  * Convert a HW interrupt number to a logical one using a IRQ domain,
 166  * and handle the result interrupt number. Return -EINVAL if
 167  * conversion failed. Providing a NULL domain indicates that the
 168  * conversion has already been done.
 169  */
 170 int __handle_domain_irq(struct irq_domain *domain, unsigned int hwirq,
 171                         bool lookup, struct pt_regs *regs);
 172
 173 static inline int handle_domain_irq(struct irq_domain *domain,
 174                                     unsigned int hwirq, struct pt_regs *regs)
 175 {
 176         return __handle_domain_irq(domain, hwirq, true, regs);
 177 }
 178 #endif
 179
 180 /* Test to see if a driver has successfully requested an irq */
 181 static inline int irq_desc_has_action(struct irq_desc *desc)
 182 {
 183         return desc->action != NULL;
 184 }
 185
 186 static inline int irq_has_action(unsigned int irq)
 187 {
 188         return irq_desc_has_action(irq_to_desc(irq));
 189 }
 190
 191 /**
 192  * irq_set_handler_locked - Set irq handler from a locked region
 193  * @data:       Pointer to the irq_data structure which identifies the irq
 194  * @handler:    Flow control handler function for this interrupt
 195  *
 196  * Sets the handler in the irq descriptor associated to @data.
 197  *
 198  * Must be called with irq_desc locked and valid parameters. Typical
 199  * call site is the irq_set_type() callback.
 200  */
 201 static inline void irq_set_handler_locked(struct irq_data *data,
 202                                           irq_flow_handler_t handler)
 203 {
 204         struct irq_desc *desc = irq_data_to_desc(data);
 205
 206         desc->handle_irq = handler;
 207 }
 208
 209 /**
 210  * irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
 211  * @data:       Pointer to the irq_data structure for which the chip is set
 212  * @chip:       Pointer to the new irq chip
 213  * @handler:    Flow control handler function for this interrupt
 214  * @name:       Name of the interrupt
 215  *
 216  * Replace the irq chip at the proper hierarchy level in @data and
 217  * sets the handler and name in the associated irq descriptor.
 218  *
 219  * Must be called with irq_desc locked and valid parameters.
 220  */
 221 static inline void
 222 irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
 223                                  irq_flow_handler_t handler, const char *name)
 224 {
 225         struct irq_desc *desc = irq_data_to_desc(data);
 226
 227         desc->handle_irq = handler;
 228         desc->name = name;
 229         data->chip = chip;
 230 }
 231
 232 static inline int irq_balancing_disabled(unsigned int irq)
 233 {
 234         struct irq_desc *desc;
 235
 236         desc = irq_to_desc(irq);
 237         return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
 238 }
 239
 240 static inline int irq_is_percpu(unsigned int irq)
 241 {
 242         struct irq_desc *desc;
 243
 244         desc = irq_to_desc(irq);
 245         return desc->status_use_accessors & IRQ_PER_CPU;
 246 }
 247
 248 static inline void
 249 irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
 250 {
 251         struct irq_desc *desc = irq_to_desc(irq);
 252
 253         if (desc)
 254                 lockdep_set_class(&desc->lock, class);
 255 }
 256
 257 #ifdef CONFIG_IRQ_PREFLOW_FASTEOI
 258 static inline void
 259 __irq_set_preflow_handler(unsigned int irq, irq_preflow_handler_t handler)
 260 {
 261         struct irq_desc *desc;
 262
 263         desc = irq_to_desc(irq);
 264         desc->preflow_handler = handler;
 265 }
 266 #endif
 267
 268 #endif