概述
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/hrtimer.h> 15 #include <linux/kref.h> 16 #include <linux/workqueue.h> 17 18 #include <linux/atomic.h> 19 #include <asm/ptrace.h> 20 #include <asm/irq.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_SHARED - allow sharing the irq among several devices 43 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur 44 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt 45 * IRQF_PERCPU - Interrupt is per cpu 46 * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing 47 * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is 48 * registered first in an shared interrupt is considered for 49 * performance reasons) 50 * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. 51 * Used by threaded interrupts which need to keep the 52 * irq line disabled until the threaded handler has been run. 53 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend. Does not guarantee 54 * that this interrupt will wake the system from a suspended 55 * state. See Documentation/power/suspend-and-interrupts.txt 56 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set 57 * IRQF_NO_THREAD - Interrupt cannot be threaded 58 * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device 59 * resume time. 60 * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this 61 * interrupt handler after suspending interrupts. For system 62 * wakeup devices users need to implement wakeup detection in 63 * their interrupt handlers. 64 */ 65 #define IRQF_SHARED 0x00000080 66 #define IRQF_PROBE_SHARED 0x00000100 67 #define __IRQF_TIMER 0x00000200 68 #define IRQF_PERCPU 0x00000400 69 #define IRQF_NOBALANCING 0x00000800 70 #define IRQF_IRQPOLL 0x00001000 71 #define IRQF_ONESHOT 0x00002000 72 #define IRQF_NO_SUSPEND 0x00004000 73 #define IRQF_FORCE_RESUME 0x00008000 74 #define IRQF_NO_THREAD 0x00010000 75 #define IRQF_EARLY_RESUME 0x00020000 76 #define IRQF_COND_SUSPEND 0x00040000 77 78 #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) 79 80 /* 81 * These values can be returned by request_any_context_irq() and 82 * describe the context the interrupt will be run in. 83 * 84 * IRQC_IS_HARDIRQ - interrupt runs in hardirq context 85 * IRQC_IS_NESTED - interrupt runs in a nested threaded context 86 */ 87 enum { 88 IRQC_IS_HARDIRQ = 0, 89 IRQC_IS_NESTED, 90 }; 91 92 typedef irqreturn_t (*irq_handler_t)(int, void *); 93 94 /** 95 * struct irqaction - per interrupt action descriptor 96 * @handler: interrupt handler function 97 * @name: name of the device 98 * @dev_id: cookie to identify the device 99 * @percpu_dev_id: cookie to identify the device 100 * @next: pointer to the next irqaction for shared interrupts 101 * @irq: interrupt number 102 * @flags: flags (see IRQF_* above) 103 * @thread_fn: interrupt handler function for threaded interrupts 104 * @thread: thread pointer for threaded interrupts 105 * @secondary: pointer to secondary irqaction (force threading) 106 * @thread_flags: flags related to @thread 107 * @thread_mask: bitmask for keeping track of @thread activity 108 * @dir: pointer to the proc/irq/NN/name entry 109 */ 110 struct irqaction { 111 irq_handler_t handler; 112 void *dev_id; 113 void __percpu *percpu_dev_id; 114 struct irqaction *next; 115 irq_handler_t thread_fn; 116 struct task_struct *thread; 117 struct irqaction *secondary; 118 unsigned int irq; 119 unsigned int flags; 120 unsigned long thread_flags; 121 unsigned long thread_mask; 122 const char *name; 123 struct proc_dir_entry *dir; 124 } ____cacheline_internodealigned_in_smp; 125 126 extern irqreturn_t no_action(int cpl, void *dev_id); 127 128 /* 129 * If a (PCI) device interrupt is not connected we set dev->irq to 130 * IRQ_NOTCONNECTED. This causes request_irq() to fail with -ENOTCONN, so we 131 * can distingiush that case from other error returns. 132 * 133 * 0x80000000 is guaranteed to be outside the available range of interrupts 134 * and easy to distinguish from other possible incorrect values. 135 */ 136 #define IRQ_NOTCONNECTED (1U << 31) 137 138 extern int __must_check 139 request_threaded_irq(unsigned int irq, irq_handler_t handler, 140 irq_handler_t thread_fn, 141 unsigned long flags, const char *name, void *dev); 142 143 static inline int __must_check 144 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, 145 const char *name, void *dev) 146 { 147 return request_threaded_irq(irq, handler, NULL, flags, name, dev); 148 } 149 150 extern int __must_check 151 request_any_context_irq(unsigned int irq, irq_handler_t handler, 152 unsigned long flags, const char *name, void *dev_id); 153 154 extern int __must_check 155 request_percpu_irq(unsigned int irq, irq_handler_t handler, 156 const char *devname, void __percpu *percpu_dev_id); 157 158 extern void free_irq(unsigned int, void *); 159 extern void free_percpu_irq(unsigned int, void __percpu *); 160 161 struct device; 162 163 extern int __must_check 164 devm_request_threaded_irq(struct device *dev, unsigned int irq, 165 irq_handler_t handler, irq_handler_t thread_fn, 166 unsigned long irqflags, const char *devname, 167 void *dev_id); 168 169 static inline int __must_check 170 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, 171 unsigned long irqflags, const char *devname, void *dev_id) 172 { 173 return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, 174 devname, dev_id); 175 } 176 177 extern int __must_check 178 devm_request_any_context_irq(struct device *dev, unsigned int irq, 179 irq_handler_t handler, unsigned long irqflags, 180 const char *devname, void *dev_id); 181 182 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); 183 184 /* 185 * On lockdep we dont want to enable hardirqs in hardirq 186 * context. Use local_irq_enable_in_hardirq() to annotate 187 * kernel code that has to do this nevertheless (pretty much 188 * the only valid case is for old/broken hardware that is 189 * insanely slow). 190 * 191 * NOTE: in theory this might break fragile code that relies 192 * on hardirq delivery - in practice we dont seem to have such 193 * places left. So the only effect should be slightly increased 194 * irqs-off latencies. 195 */ 196 #ifdef CONFIG_LOCKDEP 197 # define local_irq_enable_in_hardirq() do { } while (0) 198 #else 199 # define local_irq_enable_in_hardirq() local_irq_enable() 200 #endif 201 202 extern void disable_irq_nosync(unsigned int irq); 203 extern bool disable_hardirq(unsigned int irq); 204 extern void disable_irq(unsigned int irq); 205 extern void disable_percpu_irq(unsigned int irq); 206 extern void enable_irq(unsigned int irq); 207 extern void enable_percpu_irq(unsigned int irq, unsigned int type); 208 extern bool irq_percpu_is_enabled(unsigned int irq); 209 extern void irq_wake_thread(unsigned int irq, void *dev_id); 210 211 /* The following three functions are for the core kernel use only. */ 212 extern void suspend_device_irqs(void); 213 extern void resume_device_irqs(void); 214 215 /** 216 * struct irq_affinity_notify - context for notification of IRQ affinity changes 217 * @irq: Interrupt to which notification applies 218 * @kref: Reference count, for internal use 219 * @work: Work item, for internal use 220 * @notify: Function to be called on change. This will be 221 * called in process context. 222 * @release: Function to be called on release. This will be 223 * called in process context. Once registered, the 224 * structure must only be freed when this function is 225 * called or later. 226 */ 227 struct irq_affinity_notify { 228 unsigned int irq; 229 struct kref kref; 230 struct work_struct work; 231 void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); 232 void (*release)(struct kref *ref); 233 }; 234 235 #if defined(CONFIG_SMP) 236 237 extern cpumask_var_t irq_default_affinity; 238 239 /* Internal implementation. Use the helpers below */ 240 extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask, 241 bool force); 242 243 /** 244 * irq_set_affinity - Set the irq affinity of a given irq 245 * @irq: Interrupt to set affinity 246 * @cpumask: cpumask 247 * 248 * Fails if cpumask does not contain an online CPU 249 */ 250 static inline int 251 irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) 252 { 253 return __irq_set_affinity(irq, cpumask, false); 254 } 255 256 /** 257 * irq_force_affinity - Force the irq affinity of a given irq 258 * @irq: Interrupt to set affinity 259 * @cpumask: cpumask 260 * 261 * Same as irq_set_affinity, but without checking the mask against 262 * online cpus. 263 * 264 * Solely for low level cpu hotplug code, where we need to make per 265 * cpu interrupts affine before the cpu becomes online. 266 */ 267 static inline int 268 irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) 269 { 270 return __irq_set_affinity(irq, cpumask, true); 271 } 272 273 extern int irq_can_set_affinity(unsigned int irq); 274 extern int irq_select_affinity(unsigned int irq); 275 276 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); 277 278 extern int 279 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); 280 281 struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs); 282 283 #else /* CONFIG_SMP */ 284 285 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) 286 { 287 return -EINVAL; 288 } 289 290 static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) 291 { 292 return 0; 293 } 294 295 static inline int irq_can_set_affinity(unsigned int irq) 296 { 297 return 0; 298 } 299 300 static inline int irq_select_affinity(unsigned int irq) { return 0; } 301 302 static inline int irq_set_affinity_hint(unsigned int irq, 303 const struct cpumask *m) 304 { 305 return -EINVAL; 306 } 307 308 static inline int 309 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify) 310 { 311 return 0; 312 } 313 314 static inline struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs) 315 { 316 *nr_vecs = 1; 317 return NULL; 318 } 319 #endif /* CONFIG_SMP */ 320 321 /* 322 * Special lockdep variants of irq disabling/enabling. 323 * These should be used for locking constructs that 324 * know that a particular irq context which is disabled, 325 * and which is the only irq-context user of a lock, 326 * that it's safe to take the lock in the irq-disabled 327 * section without disabling hardirqs. 328 * 329 * On !CONFIG_LOCKDEP they are equivalent to the normal 330 * irq disable/enable methods. 331 */ 332 static inline void disable_irq_nosync_lockdep(unsigned int irq) 333 { 334 disable_irq_nosync(irq); 335 #ifdef CONFIG_LOCKDEP 336 local_irq_disable(); 337 #endif 338 } 339 340 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) 341 { 342 disable_irq_nosync(irq); 343 #ifdef CONFIG_LOCKDEP 344 local_irq_save(*flags);//关闭当前处理器上的所有中断处理 345 #endif 346 } 347 348 static inline void disable_irq_lockdep(unsigned int irq) 349 { 350 disable_irq(irq); 351 #ifdef CONFIG_LOCKDEP 352 local_irq_disable();//和 local_irq_save() 都可以禁止中断，但不同的是后者可以保存中断状态。 353 #endif 354 } 355 356 static inline void enable_irq_lockdep(unsigned int irq) 357 { 358 #ifdef CONFIG_LOCKDEP 359 local_irq_enable(); 360 #endif 361 enable_irq(irq); 362 } 363 364 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) 365 { 366 #ifdef CONFIG_LOCKDEP 367 local_irq_restore(*flags);//在使能中断的同时还恢复了由 local_irq_save() 所保存的中断状态。 368 #endif 369 enable_irq(irq); 370 } 371 372 /* IRQ wakeup (PM) control: */ 373 extern int irq_set_irq_wake(unsigned int irq, unsigned int on); 374 375 static inline int enable_irq_wake(unsigned int irq) 376 { 377 return irq_set_irq_wake(irq, 1); 378 } 379 380 static inline int disable_irq_wake(unsigned int irq) 381 { 382 return irq_set_irq_wake(irq, 0); 383 } 384 385 /* 386 * irq_get_irqchip_state/irq_set_irqchip_state specific flags 387 */ 388 enum irqchip_irq_state { 389 IRQCHIP_STATE_PENDING, /* Is interrupt pending? */ 390 IRQCHIP_STATE_ACTIVE, /* Is interrupt in progress? */ 391 IRQCHIP_STATE_MASKED, /* Is interrupt masked? */ 392 IRQCHIP_STATE_LINE_LEVEL, /* Is IRQ line high? */ 393 }; 394 395 extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which, 396 bool *state); 397 extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, 398 bool state); 399 400 #ifdef CONFIG_IRQ_FORCED_THREADING 401 extern bool force_irqthreads; 402 #else 403 #define force_irqthreads (0) 404 #endif 405 406 #ifndef __ARCH_SET_SOFTIRQ_PENDING 407 #define set_softirq_pending(x) (local_softirq_pending() = (x)) 408 #define or_softirq_pending(x) (local_softirq_pending() |= (x)) 409 #endif 410 411 /* Some architectures might implement lazy enabling/disabling of 412 * interrupts. In some cases, such as stop_machine, we might want 413 * to ensure that after a local_irq_disable(), interrupts have 414 * really been disabled in hardware. Such architectures need to 415 * implement the following hook. 416 */ 417 #ifndef hard_irq_disable 418 #define hard_irq_disable() do { } while(0) 419 #endif 420 421 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high 422 frequency threaded job scheduling. For almost all the purposes 423 tasklets are more than enough. F.e. all serial device BHs et 424 al. should be converted to tasklets, not to softirqs. 425 */ 426 427 enum 428 { 429 HI_SOFTIRQ=0, 430 TIMER_SOFTIRQ, 431 NET_TX_SOFTIRQ, 432 NET_RX_SOFTIRQ, 433 BLOCK_SOFTIRQ, 434 IRQ_POLL_SOFTIRQ, 435 TASKLET_SOFTIRQ, 436 SCHED_SOFTIRQ, 437 HRTIMER_SOFTIRQ, /* Unused, but kept as tools rely on the 438 numbering. Sigh! */ 439 RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ 440 441 NR_SOFTIRQS 442 }; 443 444 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ)) 445 446 /* map softirq index to softirq name. update 'softirq_to_name' in 447 * kernel/softirq.c when adding a new softirq. 448 */ 449 extern const char * const softirq_to_name[NR_SOFTIRQS]; 450 451 /* softirq mask and active fields moved to irq_cpustat_t in 452 * asm/hardirq.h to get better cache usage. KAO 453 */ 454 455 struct softirq_action 456 { 457 void (*action)(struct softirq_action *); 458 }; 459 460 asmlinkage void do_softirq(void); 461 asmlinkage void __do_softirq(void); 462 463 #ifdef __ARCH_HAS_DO_SOFTIRQ 464 void do_softirq_own_stack(void); 465 #else 466 static inline void do_softirq_own_stack(void) 467 { 468 __do_softirq(); 469 } 470 #endif 471 472 extern void open_softirq(int nr, void (*action)(struct softirq_action *)); 473 extern void softirq_init(void); 474 extern void __raise_softirq_irqoff(unsigned int nr); 475 476 extern void raise_softirq_irqoff(unsigned int nr); 477 extern void raise_softirq(unsigned int nr); 478 479 DECLARE_PER_CPU(struct task_struct *, ksoftirqd); 480 481 static inline struct task_struct *this_cpu_ksoftirqd(void) 482 { 483 return this_cpu_read(ksoftirqd); 484 } 485 486 /* Tasklets --- multithreaded analogue of BHs. 487 488 Main feature differing them of generic softirqs: tasklet 489 is running only on one CPU simultaneously. 490 491 Main feature differing them of BHs: different tasklets 492 may be run simultaneously on different CPUs. 493 494 Properties: 495 * If tasklet_schedule() is called, then tasklet is guaranteed 496 to be executed on some cpu at least once after this. 497 * If the tasklet is already scheduled, but its execution is still not 498 started, it will be executed only once. 499 * If this tasklet is already running on another CPU (or schedule is called 500 from tasklet itself), it is rescheduled for later. 501 * Tasklet is strictly serialized wrt itself, but not 502 wrt another tasklets. If client needs some intertask synchronization, 503 he makes it with spinlocks. 504 */ 505 506 struct tasklet_struct 507 { 508 struct tasklet_struct *next; 509 unsigned long state; 510 atomic_t count; 511 void (*func)(unsigned long); 512 unsigned long data; 513 }; 514 515 #define DECLARE_TASKLET(name, func, data) 516 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } 517 518 #define DECLARE_TASKLET_DISABLED(name, func, data) 519 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } 520 521 522 enum 523 { 524 TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ 525 TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ 526 }; 527 528 #ifdef CONFIG_SMP 529 static inline int tasklet_trylock(struct tasklet_struct *t) 530 { 531 return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); 532 } 533 534 static inline void tasklet_unlock(struct tasklet_struct *t) 535 { 536 smp_mb__before_atomic(); 537 clear_bit(TASKLET_STATE_RUN, &(t)->state); 538 } 539 540 static inline void tasklet_unlock_wait(struct tasklet_struct *t) 541 { 542 while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } 543 } 544 #else 545 #define tasklet_trylock(t) 1 546 #define tasklet_unlock_wait(t) do { } while (0) 547 #define tasklet_unlock(t) do { } while (0) 548 #endif 549 550 extern void __tasklet_schedule(struct tasklet_struct *t); 551 552 static inline void tasklet_schedule(struct tasklet_struct *t) 553 { 554 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) 555 __tasklet_schedule(t); 556 } 557 558 extern void __tasklet_hi_schedule(struct tasklet_struct *t); 559 560 static inline void tasklet_hi_schedule(struct tasklet_struct *t) 561 { 562 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) 563 __tasklet_hi_schedule(t); 564 } 565 566 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); 567 568 /* 569 * This version avoids touching any other tasklets. Needed for kmemcheck 570 * in order not to take any page faults while enqueueing this tasklet; 571 * consider VERY carefully whether you really need this or 572 * tasklet_hi_schedule()... 573 */ 574 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) 575 { 576 if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) 577 __tasklet_hi_schedule_first(t); 578 } 579 580 581 static inline void tasklet_disable_nosync(struct tasklet_struct *t) 582 { 583 atomic_inc(&t->count); 584 smp_mb__after_atomic(); 585 } 586 587 static inline void tasklet_disable(struct tasklet_struct *t) 588 { 589 tasklet_disable_nosync(t); 590 tasklet_unlock_wait(t); 591 smp_mb(); 592 } 593 594 static inline void tasklet_enable(struct tasklet_struct *t) 595 { 596 smp_mb__before_atomic(); 597 atomic_dec(&t->count); 598 } 599 600 extern void tasklet_kill(struct tasklet_struct *t); 601 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); 602 extern void tasklet_init(struct tasklet_struct *t, 603 void (*func)(unsigned long), unsigned long data); 604 605 struct tasklet_hrtimer { 606 struct hrtimer timer; 607 struct tasklet_struct tasklet; 608 enum hrtimer_restart (*function)(struct hrtimer *); 609 }; 610 611 extern void 612 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, 613 enum hrtimer_restart (*function)(struct hrtimer *), 614 clockid_t which_clock, enum hrtimer_mode mode); 615 616 static inline 617 void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, 618 const enum hrtimer_mode mode) 619 { 620 hrtimer_start(&ttimer->timer, time, mode); 621 } 622 623 static inline 624 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) 625 { 626 hrtimer_cancel(&ttimer->timer); 627 tasklet_kill(&ttimer->tasklet); 628 } 629 630 /* 631 * Autoprobing for irqs: 632 * 633 * probe_irq_on() and probe_irq_off() provide robust primitives 634 * for accurate IRQ probing during kernel initialization. They are 635 * reasonably simple to use, are not "fooled" by spurious interrupts, 636 * and, unlike other attempts at IRQ probing, they do not get hung on 637 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). 638 * 639 * For reasonably foolproof probing, use them as follows: 640 * 641 * 1. clear and/or mask the device's internal interrupt. 642 * 2. sti(); 643 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs 644 * 4. enable the device and cause it to trigger an interrupt. 645 * 5. wait for the device to interrupt, using non-intrusive polling or a delay. 646 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple 647 * 7. service the device to clear its pending interrupt. 648 * 8. loop again if paranoia is required. 649 * 650 * probe_irq_on() returns a mask of allocated irq's. 651 * 652 * probe_irq_off() takes the mask as a parameter, 653 * and returns the irq number which occurred, 654 * or zero if none occurred, or a negative irq number 655 * if more than one irq occurred. 656 */ 657 658 #if !defined(CONFIG_GENERIC_IRQ_PROBE) 659 static inline unsigned long probe_irq_on(void) 660 { 661 return 0; 662 } 663 static inline int probe_irq_off(unsigned long val) 664 { 665 return 0; 666 } 667 static inline unsigned int probe_irq_mask(unsigned long val) 668 { 669 return 0; 670 } 671 #else 672 extern unsigned long probe_irq_on(void); /* returns 0 on failure */ 673 extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ 674 extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ 675 #endif 676 677 #ifdef CONFIG_PROC_FS 678 /* Initialize /proc/irq/ */ 679 extern void init_irq_proc(void); 680 #else 681 static inline void init_irq_proc(void) 682 { 683 } 684 #endif 685 686 struct seq_file; 687 int show_interrupts(struct seq_file *p, void *v); 688 int arch_show_interrupts(struct seq_file *p, int prec); 689 690 extern int early_irq_init(void); 691 extern int arch_probe_nr_irqs(void); 692 extern int arch_early_irq_init(void); 693 694 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN) 695 /* 696 * We want to know which function is an entrypoint of a hardirq or a softirq. 697 */ 698 #define __irq_entry __attribute__((__section__(".irqentry.text"))) 699 #define __softirq_entry 700 __attribute__((__section__(".softirqentry.text"))) 701 702 /* Limits of hardirq entrypoints */ 703 extern char __irqentry_text_start[]; 704 extern char __irqentry_text_end[]; 705 /* Limits of softirq entrypoints */ 706 extern char __softirqentry_text_start[]; 707 extern char __softirqentry_text_end[]; 708 709 #else 710 #define __irq_entry 711 #define __softirq_entry 712 #endif 713 714 #endif 715
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