include/linux/interrupt.h

   1 /* interrupt.h */
   2 #ifndef _LINUX_INTERRUPT_H
   3 #define _LINUX_INTERRUPT_H
   4
   5 #include <linux/kernel.h>
   6 #include <linux/linkage.h>
   7 #include <linux/bitops.h>
   8 #include <linux/preempt.h>
   9 #include <linux/cpumask.h>
  10 #include <linux/irqreturn.h>
  11 #include <linux/irqnr.h>
  12 #include <linux/hardirq.h>
  13 #include <linux/irqflags.h>
  14 #include <linux/smp.h>
  15 #include <linux/percpu.h>
  16 #include <linux/hrtimer.h>
  17
  18 #include <asm/atomic.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/system.h>
  21
  22 /*
  23  * These correspond to the IORESOURCE_IRQ_* defines in
  24  * linux/ioport.h to select the interrupt line behaviour.  When
  25  * requesting an interrupt without specifying a IRQF_TRIGGER, the
  26  * setting should be assumed to be "as already configured", which
  27  * may be as per machine or firmware initialisation.
  28  */
  29 #define IRQF_TRIGGER_NONE       0x00000000
  30 #define IRQF_TRIGGER_RISING     0x00000001
  31 #define IRQF_TRIGGER_FALLING    0x00000002
  32 #define IRQF_TRIGGER_HIGH       0x00000004
  33 #define IRQF_TRIGGER_LOW        0x00000008
  34 #define IRQF_TRIGGER_MASK       (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
  35                                  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
  36 #define IRQF_TRIGGER_PROBE      0x00000010
  37
  38 /*
  39  * These flags used only by the kernel as part of the
  40  * irq handling routines.
  41  *
  42  * IRQF_DISABLED - keep irqs disabled when calling the action handler
  43  * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
  44  * IRQF_SHARED - allow sharing the irq among several devices
  45  * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
  46  * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
  47  * IRQF_PERCPU - Interrupt is per cpu
  48  * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
  49  * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
  50  *                registered first in an shared interrupt is considered for
  51  *                performance reasons)
  52  * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
  53  *                Used by threaded interrupts which need to keep the
  54  *                irq line disabled until the threaded handler has been run.
  55  * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
  56  * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
  57  * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
  58  *                resume time.
  59  */
  60 #define IRQF_DISABLED           0x00000020
  61 #define IRQF_SAMPLE_RANDOM      0x00000040
  62 #define IRQF_SHARED             0x00000080
  63 #define IRQF_PROBE_SHARED       0x00000100
  64 #define __IRQF_TIMER            0x00000200
  65 #define IRQF_PERCPU             0x00000400
  66 #define IRQF_NOBALANCING        0x00000800
  67 #define IRQF_IRQPOLL            0x00001000
  68 #define IRQF_ONESHOT            0x00002000
  69 #define IRQF_NO_SUSPEND         0x00004000
  70 #define IRQF_FORCE_RESUME       0x00008000
  71 #define IRQF_EARLY_RESUME       0x00020000
  72
  73 #define IRQF_TIMER              (__IRQF_TIMER | IRQF_NO_SUSPEND)
  74
  75 /*
  76  * Bits used by threaded handlers:
  77  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  78  * IRQTF_DIED      - handler thread died
  79  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  80  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  81  */
  82 enum {
  83         IRQTF_RUNTHREAD,
  84         IRQTF_DIED,
  85         IRQTF_WARNED,
  86         IRQTF_AFFINITY,
  87 };
  88
  89 typedef irqreturn_t (*irq_handler_t)(int, void *);
  90
  91 /**
  92  * struct irqaction - per interrupt action descriptor
  93  * @handler:    interrupt handler function
  94  * @flags:      flags (see IRQF_* above)
  95  * @name:       name of the device
  96  * @dev_id:     cookie to identify the device
  97  * @next:       pointer to the next irqaction for shared interrupts
  98  * @irq:        interrupt number
  99  * @dir:        pointer to the proc/irq/NN/name entry
 100  * @thread_fn:  interupt handler function for threaded interrupts
 101  * @thread:     thread pointer for threaded interrupts
 102  * @thread_flags:       flags related to @thread
 103  */
 104 struct irqaction {
 105         irq_handler_t handler;
 106         unsigned long flags;
 107         const char *name;
 108         void *dev_id;
 109         struct irqaction *next;
 110         int irq;
 111         struct proc_dir_entry *dir;
 112         irq_handler_t thread_fn;
 113         struct task_struct *thread;
 114         unsigned long thread_flags;
 115 };
 116
 117 extern irqreturn_t no_action(int cpl, void *dev_id);
 118
 119 #ifdef CONFIG_GENERIC_HARDIRQS
 120 extern int __must_check
 121 request_threaded_irq(unsigned int irq, irq_handler_t handler,
 122                      irq_handler_t thread_fn,
 123                      unsigned long flags, const char *name, void *dev);
 124
 125 static inline int __must_check
 126 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
 127             const char *name, void *dev)
 128 {
 129         return request_threaded_irq(irq, handler, NULL, flags, name, dev);
 130 }
 131
 132 extern void exit_irq_thread(void);
 133 #else
 134
 135 extern int __must_check
 136 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
 137             const char *name, void *dev);
 138
 139 /*
 140  * Special function to avoid ifdeffery in kernel/irq/devres.c which
 141  * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
 142  * m68k). I really love these $@%#!* obvious Makefile references:
 143  * ../../../kernel/irq/devres.o
 144  */
 145 static inline int __must_check
 146 request_threaded_irq(unsigned int irq, irq_handler_t handler,
 147                      irq_handler_t thread_fn,
 148                      unsigned long flags, const char *name, void *dev)
 149 {
 150         return request_irq(irq, handler, flags, name, dev);
 151 }
 152
 153 static inline void exit_irq_thread(void) { }
 154 #endif
 155
 156 extern void free_irq(unsigned int, void *);
 157
 158 struct device;
 159
 160 extern int __must_check
 161 devm_request_threaded_irq(struct device *dev, unsigned int irq,
 162                           irq_handler_t handler, irq_handler_t thread_fn,
 163                           unsigned long irqflags, const char *devname,
 164                           void *dev_id);
 165
 166 static inline int __must_check
 167 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
 168                  unsigned long irqflags, const char *devname, void *dev_id)
 169 {
 170         return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
 171                                          devname, dev_id);
 172 }
 173
 174 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
 175
 176 /*
 177  * On lockdep we dont want to enable hardirqs in hardirq
 178  * context. Use local_irq_enable_in_hardirq() to annotate
 179  * kernel code that has to do this nevertheless (pretty much
 180  * the only valid case is for old/broken hardware that is
 181  * insanely slow).
 182  *
 183  * NOTE: in theory this might break fragile code that relies
 184  * on hardirq delivery - in practice we dont seem to have such
 185  * places left. So the only effect should be slightly increased
 186  * irqs-off latencies.
 187  */
 188 #ifdef CONFIG_LOCKDEP
 189 # define local_irq_enable_in_hardirq()  do { } while (0)
 190 #else
 191 # define local_irq_enable_in_hardirq()  local_irq_enable()
 192 #endif
 193
 194 extern void disable_irq_nosync(unsigned int irq);
 195 extern void disable_irq(unsigned int irq);
 196 extern void enable_irq(unsigned int irq);
 197
 198 /* The following three functions are for the core kernel use only. */
 199 #ifdef CONFIG_GENERIC_HARDIRQS
 200 extern void suspend_device_irqs(void);
 201 extern void resume_device_irqs(void);
 202 #ifdef CONFIG_PM_SLEEP
 203 extern int check_wakeup_irqs(void);
 204 extern void irq_pm_syscore_resume(void);
 205 #else
 206 static inline int check_wakeup_irqs(void) { return 0; }
 207 static inline void irq_pm_syscore_resume(void) { };
 208 #endif
 209 #else
 210 static inline void suspend_device_irqs(void) { };
 211 static inline void resume_device_irqs(void) { };
 212 static inline int check_wakeup_irqs(void) { return 0; }
 213 static inline void irq_pm_syscore_resume(void) { };
 214 #endif
 215
 216 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
 217
 218 extern cpumask_var_t irq_default_affinity;
 219
 220 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
 221 extern int irq_can_set_affinity(unsigned int irq);
 222 extern int irq_select_affinity(unsigned int irq);
 223
 224 #else /* CONFIG_SMP */
 225
 226 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
 227 {
 228         return -EINVAL;
 229 }
 230
 231 static inline int irq_can_set_affinity(unsigned int irq)
 232 {
 233         return 0;
 234 }
 235
 236 static inline int irq_select_affinity(unsigned int irq)  { return 0; }
 237
 238 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
 239
 240 #ifdef CONFIG_GENERIC_HARDIRQS
 241 /*
 242  * Special lockdep variants of irq disabling/enabling.
 243  * These should be used for locking constructs that
 244  * know that a particular irq context which is disabled,
 245  * and which is the only irq-context user of a lock,
 246  * that it's safe to take the lock in the irq-disabled
 247  * section without disabling hardirqs.
 248  *
 249  * On !CONFIG_LOCKDEP they are equivalent to the normal
 250  * irq disable/enable methods.
 251  */
 252 static inline void disable_irq_nosync_lockdep(unsigned int irq)
 253 {
 254         disable_irq_nosync(irq);
 255 #ifdef CONFIG_LOCKDEP
 256         local_irq_disable();
 257 #endif
 258 }
 259
 260 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
 261 {
 262         disable_irq_nosync(irq);
 263 #ifdef CONFIG_LOCKDEP
 264         local_irq_save(*flags);
 265 #endif
 266 }
 267
 268 static inline void disable_irq_lockdep(unsigned int irq)
 269 {
 270         disable_irq(irq);
 271 #ifdef CONFIG_LOCKDEP
 272         local_irq_disable();
 273 #endif
 274 }
 275
 276 static inline void enable_irq_lockdep(unsigned int irq)
 277 {
 278 #ifdef CONFIG_LOCKDEP
 279         local_irq_enable();
 280 #endif
 281         enable_irq(irq);
 282 }
 283
 284 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
 285 {
 286 #ifdef CONFIG_LOCKDEP
 287         local_irq_restore(*flags);
 288 #endif
 289         enable_irq(irq);
 290 }
 291
 292 /* IRQ wakeup (PM) control: */
 293 extern int set_irq_wake(unsigned int irq, unsigned int on);
 294
 295 static inline int enable_irq_wake(unsigned int irq)
 296 {
 297         return set_irq_wake(irq, 1);
 298 }
 299
 300 static inline int disable_irq_wake(unsigned int irq)
 301 {
 302         return set_irq_wake(irq, 0);
 303 }
 304
 305 #else /* !CONFIG_GENERIC_HARDIRQS */
 306 /*
 307  * NOTE: non-genirq architectures, if they want to support the lock
 308  * validator need to define the methods below in their asm/irq.h
 309  * files, under an #ifdef CONFIG_LOCKDEP section.
 310  */
 311 #ifndef CONFIG_LOCKDEP
 312 #  define disable_irq_nosync_lockdep(irq)       disable_irq_nosync(irq)
 313 #  define disable_irq_nosync_lockdep_irqsave(irq, flags) \
 314                                                 disable_irq_nosync(irq)
 315 #  define disable_irq_lockdep(irq)              disable_irq(irq)
 316 #  define enable_irq_lockdep(irq)               enable_irq(irq)
 317 #  define enable_irq_lockdep_irqrestore(irq, flags) \
 318                                                 enable_irq(irq)
 319 # endif
 320
 321 static inline int enable_irq_wake(unsigned int irq)
 322 {
 323         return 0;
 324 }
 325
 326 static inline int disable_irq_wake(unsigned int irq)
 327 {
 328         return 0;
 329 }
 330 #endif /* CONFIG_GENERIC_HARDIRQS */
 331
 332 #ifndef __ARCH_SET_SOFTIRQ_PENDING
 333 #define set_softirq_pending(x) (local_softirq_pending() = (x))
 334 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
 335 #endif
 336
 337 /* Some architectures might implement lazy enabling/disabling of
 338  * interrupts. In some cases, such as stop_machine, we might want
 339  * to ensure that after a local_irq_disable(), interrupts have
 340  * really been disabled in hardware. Such architectures need to
 341  * implement the following hook.
 342  */
 343 #ifndef hard_irq_disable
 344 #define hard_irq_disable()      do { } while(0)
 345 #endif
 346
 347 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
 348    frequency threaded job scheduling. For almost all the purposes
 349    tasklets are more than enough. F.e. all serial device BHs et
 350    al. should be converted to tasklets, not to softirqs.
 351  */
 352
 353 enum
 354 {
 355         HI_SOFTIRQ=0,
 356         TIMER_SOFTIRQ,
 357         NET_TX_SOFTIRQ,
 358         NET_RX_SOFTIRQ,
 359         BLOCK_SOFTIRQ,
 360         BLOCK_IOPOLL_SOFTIRQ,
 361         TASKLET_SOFTIRQ,
 362         SCHED_SOFTIRQ,
 363         HRTIMER_SOFTIRQ,
 364         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
 365
 366         NR_SOFTIRQS
 367 };
 368
 369 /* map softirq index to softirq name. update 'softirq_to_name' in
 370  * kernel/softirq.c when adding a new softirq.
 371  */
 372 extern char *softirq_to_name[NR_SOFTIRQS];
 373
 374 /* softirq mask and active fields moved to irq_cpustat_t in
 375  * asm/hardirq.h to get better cache usage.  KAO
 376  */
 377
 378 struct softirq_action
 379 {
 380         void    (*action)(struct softirq_action *);
 381 };
 382
 383 asmlinkage void do_softirq(void);
 384 asmlinkage void __do_softirq(void);
 385 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
 386 extern void softirq_init(void);
 387 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
 388 extern void raise_softirq_irqoff(unsigned int nr);
 389 extern void raise_softirq(unsigned int nr);
 390 extern void wakeup_softirqd(void);
 391
 392 /* This is the worklist that queues up per-cpu softirq work.
 393  *
 394  * send_remote_sendirq() adds work to these lists, and
 395  * the softirq handler itself dequeues from them.  The queues
 396  * are protected by disabling local cpu interrupts and they must
 397  * only be accessed by the local cpu that they are for.
 398  */
 399 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
 400
 401 /* Try to send a softirq to a remote cpu.  If this cannot be done, the
 402  * work will be queued to the local cpu.
 403  */
 404 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
 405
 406 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
 407  * and compute the current cpu, passed in as 'this_cpu'.
 408  */
 409 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
 410                                   int this_cpu, int softirq);
 411
 412 /* Tasklets --- multithreaded analogue of BHs.
 413
 414    Main feature differing them of generic softirqs: tasklet
 415    is running only on one CPU simultaneously.
 416
 417    Main feature differing them of BHs: different tasklets
 418    may be run simultaneously on different CPUs.
 419
 420    Properties:
 421    * If tasklet_schedule() is called, then tasklet is guaranteed
 422      to be executed on some cpu at least once after this.
 423    * If the tasklet is already scheduled, but its excecution is still not
 424      started, it will be executed only once.
 425    * If this tasklet is already running on another CPU (or schedule is called
 426      from tasklet itself), it is rescheduled for later.
 427    * Tasklet is strictly serialized wrt itself, but not
 428      wrt another tasklets. If client needs some intertask synchronization,
 429      he makes it with spinlocks.
 430  */
 431
 432 struct tasklet_struct
 433 {
 434         struct tasklet_struct *next;
 435         unsigned long state;
 436         atomic_t count;
 437         void (*func)(unsigned long);
 438         unsigned long data;
 439 };
 440
 441 #define DECLARE_TASKLET(name, func, data) \
 442 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
 443
 444 #define DECLARE_TASKLET_DISABLED(name, func, data) \
 445 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
 446
 447
 448 enum
 449 {
 450         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
 451         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
 452 };
 453
 454 #ifdef CONFIG_SMP
 455 static inline int tasklet_trylock(struct tasklet_struct *t)
 456 {
 457         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
 458 }
 459
 460 static inline void tasklet_unlock(struct tasklet_struct *t)
 461 {
 462         smp_mb__before_clear_bit();
 463         clear_bit(TASKLET_STATE_RUN, &(t)->state);
 464 }
 465
 466 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
 467 {
 468         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
 469 }
 470 #else
 471 #define tasklet_trylock(t) 1
 472 #define tasklet_unlock_wait(t) do { } while (0)
 473 #define tasklet_unlock(t) do { } while (0)
 474 #endif
 475
 476 extern void __tasklet_schedule(struct tasklet_struct *t);
 477
 478 static inline void tasklet_schedule(struct tasklet_struct *t)
 479 {
 480         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 481                 __tasklet_schedule(t);
 482 }
 483
 484 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
 485
 486 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
 487 {
 488         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 489                 __tasklet_hi_schedule(t);
 490 }
 491
 492 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
 493
 494 /*
 495  * This version avoids touching any other tasklets. Needed for kmemcheck
 496  * in order not to take any page faults while enqueueing this tasklet;
 497  * consider VERY carefully whether you really need this or
 498  * tasklet_hi_schedule()...
 499  */
 500 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
 501 {
 502         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 503                 __tasklet_hi_schedule_first(t);
 504 }
 505
 506
 507 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 508 {
 509         atomic_inc(&t->count);
 510         smp_mb__after_atomic_inc();
 511 }
 512
 513 static inline void tasklet_disable(struct tasklet_struct *t)
 514 {
 515         tasklet_disable_nosync(t);
 516         tasklet_unlock_wait(t);
 517         smp_mb();
 518 }
 519
 520 static inline void tasklet_enable(struct tasklet_struct *t)
 521 {
 522         smp_mb__before_atomic_dec();
 523         atomic_dec(&t->count);
 524 }
 525
 526 static inline void tasklet_hi_enable(struct tasklet_struct *t)
 527 {
 528         smp_mb__before_atomic_dec();
 529         atomic_dec(&t->count);
 530 }
 531
 532 extern void tasklet_kill(struct tasklet_struct *t);
 533 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
 534 extern void tasklet_init(struct tasklet_struct *t,
 535                          void (*func)(unsigned long), unsigned long data);
 536
 537 struct tasklet_hrtimer {
 538         struct hrtimer          timer;
 539         struct tasklet_struct   tasklet;
 540         enum hrtimer_restart    (*function)(struct hrtimer *);
 541 };
 542
 543 extern void
 544 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
 545                      enum hrtimer_restart (*function)(struct hrtimer *),
 546                      clockid_t which_clock, enum hrtimer_mode mode);
 547
 548 static inline
 549 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
 550                           const enum hrtimer_mode mode)
 551 {
 552         return hrtimer_start(&ttimer->timer, time, mode);
 553 }
 554
 555 static inline
 556 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
 557 {
 558         hrtimer_cancel(&ttimer->timer);
 559         tasklet_kill(&ttimer->tasklet);
 560 }
 561
 562 /*
 563  * Autoprobing for irqs:
 564  *
 565  * probe_irq_on() and probe_irq_off() provide robust primitives
 566  * for accurate IRQ probing during kernel initialization.  They are
 567  * reasonably simple to use, are not "fooled" by spurious interrupts,
 568  * and, unlike other attempts at IRQ probing, they do not get hung on
 569  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
 570  *
 571  * For reasonably foolproof probing, use them as follows:
 572  *
 573  * 1. clear and/or mask the device's internal interrupt.
 574  * 2. sti();
 575  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
 576  * 4. enable the device and cause it to trigger an interrupt.
 577  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
 578  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
 579  * 7. service the device to clear its pending interrupt.
 580  * 8. loop again if paranoia is required.
 581  *
 582  * probe_irq_on() returns a mask of allocated irq's.
 583  *
 584  * probe_irq_off() takes the mask as a parameter,
 585  * and returns the irq number which occurred,
 586  * or zero if none occurred, or a negative irq number
 587  * if more than one irq occurred.
 588  */
 589
 590 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
 591 static inline unsigned long probe_irq_on(void)
 592 {
 593         return 0;
 594 }
 595 static inline int probe_irq_off(unsigned long val)
 596 {
 597         return 0;
 598 }
 599 static inline unsigned int probe_irq_mask(unsigned long val)
 600 {
 601         return 0;
 602 }
 603 #else
 604 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
 605 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
 606 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
 607 #endif
 608
 609 #ifdef CONFIG_PROC_FS
 610 /* Initialize /proc/irq/ */
 611 extern void init_irq_proc(void);
 612 #else
 613 static inline void init_irq_proc(void)
 614 {
 615 }
 616 #endif
 617
 618 #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
 619 extern void debug_poll_all_shared_irqs(void);
 620 #else
 621 static inline void debug_poll_all_shared_irqs(void) { }
 622 #endif
 623
 624 struct seq_file;
 625 int show_interrupts(struct seq_file *p, void *v);
 626
 627 struct irq_desc;
 628
 629 extern int early_irq_init(void);
 630 extern int arch_probe_nr_irqs(void);
 631 extern int arch_early_irq_init(void);
 632 extern int arch_init_chip_data(struct irq_desc *desc, int node);
 633
 634 #endif