include/linux/irq.h

   1 #ifndef _LINUX_IRQ_H
   2 #define _LINUX_IRQ_H
   3
   4 /*
   5  * Please do not include this file in generic code.  There is currently
   6  * no requirement for any architecture to implement anything held
   7  * within this file.
   8  *
   9  * Thanks. --rmk
  10  */
  11
  12 #include <linux/smp.h>
  13
  14 #ifndef CONFIG_S390
  15
  16 #include <linux/linkage.h>
  17 #include <linux/cache.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/cpumask.h>
  20 #include <linux/irqreturn.h>
  21 #include <linux/errno.h>
  22
  23 #include <asm/irq.h>
  24 #include <asm/ptrace.h>
  25 #include <asm/irq_regs.h>
  26
  27 struct irq_desc;
  28 typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
  29                                             struct irq_desc *desc);
  30
  31
  32 /*
  33  * IRQ line status.
  34  *
  35  * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
  36  *
  37  * IRQ types
  38  */
  39 #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
  40 #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
  41 #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
  42 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
  43 #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
  44 #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
  45 #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
  46 #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
  47
  48 /* Internal flags */
  49 #define IRQ_INPROGRESS          0x00000100      /* IRQ handler active - do not enter! */
  50 #define IRQ_DISABLED            0x00000200      /* IRQ disabled - do not enter! */
  51 #define IRQ_PENDING             0x00000400      /* IRQ pending - replay on enable */
  52 #define IRQ_REPLAY              0x00000800      /* IRQ has been replayed but not acked yet */
  53 #define IRQ_AUTODETECT          0x00001000      /* IRQ is being autodetected */
  54 #define IRQ_WAITING             0x00002000      /* IRQ not yet seen - for autodetection */
  55 #define IRQ_LEVEL               0x00004000      /* IRQ level triggered */
  56 #define IRQ_MASKED              0x00008000      /* IRQ masked - shouldn't be seen again */
  57 #define IRQ_PER_CPU             0x00010000      /* IRQ is per CPU */
  58 #define IRQ_NOPROBE             0x00020000      /* IRQ is not valid for probing */
  59 #define IRQ_NOREQUEST           0x00040000      /* IRQ cannot be requested */
  60 #define IRQ_NOAUTOEN            0x00080000      /* IRQ will not be enabled on request irq */
  61 #define IRQ_WAKEUP              0x00100000      /* IRQ triggers system wakeup */
  62 #define IRQ_MOVE_PENDING        0x00200000      /* need to re-target IRQ destination */
  63 #define IRQ_NO_BALANCING        0x00400000      /* IRQ is excluded from balancing */
  64
  65 #ifdef CONFIG_IRQ_PER_CPU
  66 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  67 # define IRQ_NO_BALANCING_MASK  (IRQ_PER_CPU | IRQ_NO_BALANCING)
  68 #else
  69 # define CHECK_IRQ_PER_CPU(var) 0
  70 # define IRQ_NO_BALANCING_MASK  IRQ_NO_BALANCING
  71 #endif
  72
  73 struct proc_dir_entry;
  74 struct msi_desc;
  75
  76 /**
  77  * struct irq_chip - hardware interrupt chip descriptor
  78  *
  79  * @name:               name for /proc/interrupts
  80  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  81  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  82  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  83  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  84  * @ack:                start of a new interrupt
  85  * @mask:               mask an interrupt source
  86  * @mask_ack:           ack and mask an interrupt source
  87  * @unmask:             unmask an interrupt source
  88  * @eoi:                end of interrupt - chip level
  89  * @end:                end of interrupt - flow level
  90  * @set_affinity:       set the CPU affinity on SMP machines
  91  * @retrigger:          resend an IRQ to the CPU
  92  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
  93  * @set_wake:           enable/disable power-management wake-on of an IRQ
  94  *
  95  * @release:            release function solely used by UML
  96  * @typename:           obsoleted by name, kept as migration helper
  97  */
  98 struct irq_chip {
  99         const char      *name;
 100         unsigned int    (*startup)(unsigned int irq);
 101         void            (*shutdown)(unsigned int irq);
 102         void            (*enable)(unsigned int irq);
 103         void            (*disable)(unsigned int irq);
 104
 105         void            (*ack)(unsigned int irq);
 106         void            (*mask)(unsigned int irq);
 107         void            (*mask_ack)(unsigned int irq);
 108         void            (*unmask)(unsigned int irq);
 109         void            (*eoi)(unsigned int irq);
 110
 111         void            (*end)(unsigned int irq);
 112         void            (*set_affinity)(unsigned int irq, cpumask_t dest);
 113         int             (*retrigger)(unsigned int irq);
 114         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 115         int             (*set_wake)(unsigned int irq, unsigned int on);
 116
 117         /* Currently used only by UML, might disappear one day.*/
 118 #ifdef CONFIG_IRQ_RELEASE_METHOD
 119         void            (*release)(unsigned int irq, void *dev_id);
 120 #endif
 121         /*
 122          * For compatibility, ->typename is copied into ->name.
 123          * Will disappear.
 124          */
 125         const char      *typename;
 126 };
 127
 128 /**
 129  * struct irq_desc - interrupt descriptor
 130  *
 131  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 132  * @chip:               low level interrupt hardware access
 133  * @msi_desc:           MSI descriptor
 134  * @handler_data:       per-IRQ data for the irq_chip methods
 135  * @chip_data:          platform-specific per-chip private data for the chip
 136  *                      methods, to allow shared chip implementations
 137  * @action:             the irq action chain
 138  * @status:             status information
 139  * @depth:              disable-depth, for nested irq_disable() calls
 140  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 141  * @irq_count:          stats field to detect stalled irqs
 142  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 143  * @last_unhandled:     aging timer for unhandled count
 144  * @lock:               locking for SMP
 145  * @affinity:           IRQ affinity on SMP
 146  * @cpu:                cpu index useful for balancing
 147  * @pending_mask:       pending rebalanced interrupts
 148  * @dir:                /proc/irq/ procfs entry
 149  * @affinity_entry:     /proc/irq/smp_affinity procfs entry on SMP
 150  * @name:               flow handler name for /proc/interrupts output
 151  */
 152 struct irq_desc {
 153         irq_flow_handler_t      handle_irq;
 154         struct irq_chip         *chip;
 155         struct msi_desc         *msi_desc;
 156         void                    *handler_data;
 157         void                    *chip_data;
 158         struct irqaction        *action;        /* IRQ action list */
 159         unsigned int            status;         /* IRQ status */
 160
 161         unsigned int            depth;          /* nested irq disables */
 162         unsigned int            wake_depth;     /* nested wake enables */
 163         unsigned int            irq_count;      /* For detecting broken IRQs */
 164         unsigned int            irqs_unhandled;
 165         unsigned long           last_unhandled; /* Aging timer for unhandled count */
 166         spinlock_t              lock;
 167 #ifdef CONFIG_SMP
 168         cpumask_t               affinity;
 169         unsigned int            cpu;
 170 #endif
 171 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 172         cpumask_t               pending_mask;
 173 #endif
 174 #ifdef CONFIG_PROC_FS
 175         struct proc_dir_entry   *dir;
 176 #endif
 177         const char              *name;
 178 } ____cacheline_internodealigned_in_smp;
 179
 180 extern struct irq_desc irq_desc[NR_IRQS];
 181
 182 /*
 183  * Migration helpers for obsolete names, they will go away:
 184  */
 185 #define hw_interrupt_type       irq_chip
 186 typedef struct irq_chip         hw_irq_controller;
 187 #define no_irq_type             no_irq_chip
 188 typedef struct irq_desc         irq_desc_t;
 189
 190 /*
 191  * Pick up the arch-dependent methods:
 192  */
 193 #include <asm/hw_irq.h>
 194
 195 extern int setup_irq(unsigned int irq, struct irqaction *new);
 196
 197 #ifdef CONFIG_GENERIC_HARDIRQS
 198
 199 #ifndef handle_dynamic_tick
 200 # define handle_dynamic_tick(a)         do { } while (0)
 201 #endif
 202
 203 #ifdef CONFIG_SMP
 204
 205 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 206
 207 void set_pending_irq(unsigned int irq, cpumask_t mask);
 208 void move_native_irq(int irq);
 209 void move_masked_irq(int irq);
 210
 211 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 212
 213 static inline void move_irq(int irq)
 214 {
 215 }
 216
 217 static inline void move_native_irq(int irq)
 218 {
 219 }
 220
 221 static inline void move_masked_irq(int irq)
 222 {
 223 }
 224
 225 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 226 {
 227 }
 228
 229 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 230
 231 extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
 232 extern int irq_can_set_affinity(unsigned int irq);
 233
 234 #else /* CONFIG_SMP */
 235
 236 #define move_native_irq(x)
 237 #define move_masked_irq(x)
 238
 239 static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 240 {
 241         return -EINVAL;
 242 }
 243
 244 static inline int irq_can_set_affinity(unsigned int irq) { return 0; }
 245
 246 #endif /* CONFIG_SMP */
 247
 248 #ifdef CONFIG_IRQBALANCE
 249 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 250 #else
 251 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 252 {
 253 }
 254 #endif
 255
 256 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 257 extern int select_smp_affinity(unsigned int irq);
 258 #else
 259 static inline int select_smp_affinity(unsigned int irq)
 260 {
 261         return 1;
 262 }
 263 #endif
 264
 265 extern int no_irq_affinity;
 266
 267 static inline int irq_balancing_disabled(unsigned int irq)
 268 {
 269         return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
 270 }
 271
 272 /* Handle irq action chains: */
 273 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
 274
 275 /*
 276  * Built-in IRQ handlers for various IRQ types,
 277  * callable via desc->chip->handle_irq()
 278  */
 279 extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc);
 280 extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 281 extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 282 extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 283 extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 284 extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 285
 286 /*
 287  * Monolithic do_IRQ implementation.
 288  * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
 289  */
 290 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 291 extern fastcall unsigned int __do_IRQ(unsigned int irq);
 292 #endif
 293
 294 /*
 295  * Architectures call this to let the generic IRQ layer
 296  * handle an interrupt. If the descriptor is attached to an
 297  * irqchip-style controller then we call the ->handle_irq() handler,
 298  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 299  */
 300 static inline void generic_handle_irq(unsigned int irq)
 301 {
 302         struct irq_desc *desc = irq_desc + irq;
 303
 304 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 305         desc->handle_irq(irq, desc);
 306 #else
 307         if (likely(desc->handle_irq))
 308                 desc->handle_irq(irq, desc);
 309         else
 310                 __do_IRQ(irq);
 311 #endif
 312 }
 313
 314 /* Handling of unhandled and spurious interrupts: */
 315 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 316                            int action_ret);
 317
 318 /* Resending of interrupts :*/
 319 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 320
 321 /* Enable/disable irq debugging output: */
 322 extern int noirqdebug_setup(char *str);
 323
 324 /* Checks whether the interrupt can be requested by request_irq(): */
 325 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 326
 327 /* Dummy irq-chip implementations: */
 328 extern struct irq_chip no_irq_chip;
 329 extern struct irq_chip dummy_irq_chip;
 330
 331 extern void
 332 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 333                          irq_flow_handler_t handle);
 334 extern void
 335 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 336                               irq_flow_handler_t handle, const char *name);
 337
 338 extern void
 339 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 340                   const char *name);
 341
 342 /* caller has locked the irq_desc and both params are valid */
 343 static inline void __set_irq_handler_unlocked(int irq,
 344                                               irq_flow_handler_t handler)
 345 {
 346         irq_desc[irq].handle_irq = handler;
 347 }
 348
 349 /*
 350  * Set a highlevel flow handler for a given IRQ:
 351  */
 352 static inline void
 353 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 354 {
 355         __set_irq_handler(irq, handle, 0, NULL);
 356 }
 357
 358 /*
 359  * Set a highlevel chained flow handler for a given IRQ.
 360  * (a chained handler is automatically enabled and set to
 361  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 362  */
 363 static inline void
 364 set_irq_chained_handler(unsigned int irq,
 365                         irq_flow_handler_t handle)
 366 {
 367         __set_irq_handler(irq, handle, 1, NULL);
 368 }
 369
 370 /* Handle dynamic irq creation and destruction */
 371 extern int create_irq(void);
 372 extern void destroy_irq(unsigned int irq);
 373
 374 /* Test to see if a driver has successfully requested an irq */
 375 static inline int irq_has_action(unsigned int irq)
 376 {
 377         struct irq_desc *desc = irq_desc + irq;
 378         return desc->action != NULL;
 379 }
 380
 381 /* Dynamic irq helper functions */
 382 extern void dynamic_irq_init(unsigned int irq);
 383 extern void dynamic_irq_cleanup(unsigned int irq);
 384
 385 /* Set/get chip/data for an IRQ: */
 386 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 387 extern int set_irq_data(unsigned int irq, void *data);
 388 extern int set_irq_chip_data(unsigned int irq, void *data);
 389 extern int set_irq_type(unsigned int irq, unsigned int type);
 390 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 391
 392 #define get_irq_chip(irq)       (irq_desc[irq].chip)
 393 #define get_irq_chip_data(irq)  (irq_desc[irq].chip_data)
 394 #define get_irq_data(irq)       (irq_desc[irq].handler_data)
 395 #define get_irq_msi(irq)        (irq_desc[irq].msi_desc)
 396
 397 #endif /* CONFIG_GENERIC_HARDIRQS */
 398
 399 #endif /* !CONFIG_S390 */
 400
 401 #endif /* _LINUX_IRQ_H */