| 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 | #include <linux/kref.h> |
| 18 | #include <linux/workqueue.h> |
| 19 | |
| 20 | #include <linux/atomic.h> |
| 21 | #include <asm/ptrace.h> |
| 22 | |
| 23 | /* |
| 24 | * These correspond to the IORESOURCE_IRQ_* defines in |
| 25 | * linux/ioport.h to select the interrupt line behaviour. When |
| 26 | * requesting an interrupt without specifying a IRQF_TRIGGER, the |
| 27 | * setting should be assumed to be "as already configured", which |
| 28 | * may be as per machine or firmware initialisation. |
| 29 | */ |
| 30 | #define IRQF_TRIGGER_NONE 0x00000000 |
| 31 | #define IRQF_TRIGGER_RISING 0x00000001 |
| 32 | #define IRQF_TRIGGER_FALLING 0x00000002 |
| 33 | #define IRQF_TRIGGER_HIGH 0x00000004 |
| 34 | #define IRQF_TRIGGER_LOW 0x00000008 |
| 35 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ |
| 36 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) |
| 37 | #define IRQF_TRIGGER_PROBE 0x00000010 |
| 38 | |
| 39 | /* |
| 40 | * These flags used only by the kernel as part of the |
| 41 | * irq handling routines. |
| 42 | * |
| 43 | * IRQF_DISABLED - keep irqs disabled when calling the action handler. |
| 44 | * DEPRECATED. This flag is a NOOP and scheduled to be removed |
| 45 | * IRQF_SHARED - allow sharing the irq among several devices |
| 46 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur |
| 47 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt |
| 48 | * IRQF_PERCPU - Interrupt is per cpu |
| 49 | * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing |
| 50 | * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is |
| 51 | * registered first in an shared interrupt is considered for |
| 52 | * performance reasons) |
| 53 | * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished. |
| 54 | * Used by threaded interrupts which need to keep the |
| 55 | * irq line disabled until the threaded handler has been run. |
| 56 | * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
| 57 | * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set |
| 58 | * IRQF_NO_THREAD - Interrupt cannot be threaded |
| 59 | * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device |
| 60 | * resume time. |
| 61 | */ |
| 62 | #define IRQF_DISABLED 0x00000020 |
| 63 | #define IRQF_SHARED 0x00000080 |
| 64 | #define IRQF_PROBE_SHARED 0x00000100 |
| 65 | #define __IRQF_TIMER 0x00000200 |
| 66 | #define IRQF_PERCPU 0x00000400 |
| 67 | #define IRQF_NOBALANCING 0x00000800 |
| 68 | #define IRQF_IRQPOLL 0x00001000 |
| 69 | #define IRQF_ONESHOT 0x00002000 |
| 70 | #define IRQF_NO_SUSPEND 0x00004000 |
| 71 | #define IRQF_FORCE_RESUME 0x00008000 |
| 72 | #define IRQF_NO_THREAD 0x00010000 |
| 73 | #define IRQF_EARLY_RESUME 0x00020000 |
| 74 | |
| 75 | #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) |
| 76 | |
| 77 | /* |
| 78 | * These values can be returned by request_any_context_irq() and |
| 79 | * describe the context the interrupt will be run in. |
| 80 | * |
| 81 | * IRQC_IS_HARDIRQ - interrupt runs in hardirq context |
| 82 | * IRQC_IS_NESTED - interrupt runs in a nested threaded context |
| 83 | */ |
| 84 | enum { |
| 85 | IRQC_IS_HARDIRQ = 0, |
| 86 | IRQC_IS_NESTED, |
| 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 | * @name: name of the device |
| 95 | * @dev_id: cookie to identify the device |
| 96 | * @percpu_dev_id: cookie to identify the device |
| 97 | * @next: pointer to the next irqaction for shared interrupts |
| 98 | * @irq: interrupt number |
| 99 | * @flags: flags (see IRQF_* above) |
| 100 | * @thread_fn: interrupt handler function for threaded interrupts |
| 101 | * @thread: thread pointer for threaded interrupts |
| 102 | * @thread_flags: flags related to @thread |
| 103 | * @thread_mask: bitmask for keeping track of @thread activity |
| 104 | * @dir: pointer to the proc/irq/NN/name entry |
| 105 | */ |
| 106 | struct irqaction { |
| 107 | irq_handler_t handler; |
| 108 | void *dev_id; |
| 109 | void __percpu *percpu_dev_id; |
| 110 | struct irqaction *next; |
| 111 | irq_handler_t thread_fn; |
| 112 | struct task_struct *thread; |
| 113 | unsigned int irq; |
| 114 | unsigned int flags; |
| 115 | unsigned long thread_flags; |
| 116 | unsigned long thread_mask; |
| 117 | const char *name; |
| 118 | struct proc_dir_entry *dir; |
| 119 | } ____cacheline_internodealigned_in_smp; |
| 120 | |
| 121 | extern irqreturn_t no_action(int cpl, void *dev_id); |
| 122 | |
| 123 | #ifdef CONFIG_GENERIC_HARDIRQS |
| 124 | extern int __must_check |
| 125 | request_threaded_irq(unsigned int irq, irq_handler_t handler, |
| 126 | irq_handler_t thread_fn, |
| 127 | unsigned long flags, const char *name, void *dev); |
| 128 | |
| 129 | static inline int __must_check |
| 130 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, |
| 131 | const char *name, void *dev) |
| 132 | { |
| 133 | return request_threaded_irq(irq, handler, NULL, flags, name, dev); |
| 134 | } |
| 135 | |
| 136 | extern int __must_check |
| 137 | request_any_context_irq(unsigned int irq, irq_handler_t handler, |
| 138 | unsigned long flags, const char *name, void *dev_id); |
| 139 | |
| 140 | extern int __must_check |
| 141 | request_percpu_irq(unsigned int irq, irq_handler_t handler, |
| 142 | const char *devname, void __percpu *percpu_dev_id); |
| 143 | #else |
| 144 | |
| 145 | extern int __must_check |
| 146 | request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, |
| 147 | const char *name, void *dev); |
| 148 | |
| 149 | /* |
| 150 | * Special function to avoid ifdeffery in kernel/irq/devres.c which |
| 151 | * gets magically built by GENERIC_HARDIRQS=n architectures (sparc, |
| 152 | * m68k). I really love these $@%#!* obvious Makefile references: |
| 153 | * ../../../kernel/irq/devres.o |
| 154 | */ |
| 155 | static inline int __must_check |
| 156 | request_threaded_irq(unsigned int irq, irq_handler_t handler, |
| 157 | irq_handler_t thread_fn, |
| 158 | unsigned long flags, const char *name, void *dev) |
| 159 | { |
| 160 | return request_irq(irq, handler, flags, name, dev); |
| 161 | } |
| 162 | |
| 163 | static inline int __must_check |
| 164 | request_any_context_irq(unsigned int irq, irq_handler_t handler, |
| 165 | unsigned long flags, const char *name, void *dev_id) |
| 166 | { |
| 167 | return request_irq(irq, handler, flags, name, dev_id); |
| 168 | } |
| 169 | |
| 170 | static inline int __must_check |
| 171 | request_percpu_irq(unsigned int irq, irq_handler_t handler, |
| 172 | const char *devname, void __percpu *percpu_dev_id) |
| 173 | { |
| 174 | return request_irq(irq, handler, 0, devname, percpu_dev_id); |
| 175 | } |
| 176 | #endif |
| 177 | |
| 178 | extern void free_irq(unsigned int, void *); |
| 179 | extern void free_percpu_irq(unsigned int, void __percpu *); |
| 180 | |
| 181 | struct device; |
| 182 | |
| 183 | extern int __must_check |
| 184 | devm_request_threaded_irq(struct device *dev, unsigned int irq, |
| 185 | irq_handler_t handler, irq_handler_t thread_fn, |
| 186 | unsigned long irqflags, const char *devname, |
| 187 | void *dev_id); |
| 188 | |
| 189 | static inline int __must_check |
| 190 | devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler, |
| 191 | unsigned long irqflags, const char *devname, void *dev_id) |
| 192 | { |
| 193 | return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, |
| 194 | devname, dev_id); |
| 195 | } |
| 196 | |
| 197 | extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id); |
| 198 | |
| 199 | /* |
| 200 | * On lockdep we dont want to enable hardirqs in hardirq |
| 201 | * context. Use local_irq_enable_in_hardirq() to annotate |
| 202 | * kernel code that has to do this nevertheless (pretty much |
| 203 | * the only valid case is for old/broken hardware that is |
| 204 | * insanely slow). |
| 205 | * |
| 206 | * NOTE: in theory this might break fragile code that relies |
| 207 | * on hardirq delivery - in practice we dont seem to have such |
| 208 | * places left. So the only effect should be slightly increased |
| 209 | * irqs-off latencies. |
| 210 | */ |
| 211 | #ifdef CONFIG_LOCKDEP |
| 212 | # define local_irq_enable_in_hardirq() do { } while (0) |
| 213 | #else |
| 214 | # define local_irq_enable_in_hardirq() local_irq_enable() |
| 215 | #endif |
| 216 | |
| 217 | extern void disable_irq_nosync(unsigned int irq); |
| 218 | extern void disable_irq(unsigned int irq); |
| 219 | extern void disable_percpu_irq(unsigned int irq); |
| 220 | extern void enable_irq(unsigned int irq); |
| 221 | extern void enable_percpu_irq(unsigned int irq, unsigned int type); |
| 222 | |
| 223 | /* The following three functions are for the core kernel use only. */ |
| 224 | #ifdef CONFIG_GENERIC_HARDIRQS |
| 225 | extern void suspend_device_irqs(void); |
| 226 | extern void resume_device_irqs(void); |
| 227 | #ifdef CONFIG_PM_SLEEP |
| 228 | extern int check_wakeup_irqs(void); |
| 229 | #else |
| 230 | static inline int check_wakeup_irqs(void) { return 0; } |
| 231 | #endif |
| 232 | #else |
| 233 | static inline void suspend_device_irqs(void) { }; |
| 234 | static inline void resume_device_irqs(void) { }; |
| 235 | static inline int check_wakeup_irqs(void) { return 0; } |
| 236 | #endif |
| 237 | |
| 238 | #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS) |
| 239 | |
| 240 | extern cpumask_var_t irq_default_affinity; |
| 241 | |
| 242 | extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); |
| 243 | extern int irq_can_set_affinity(unsigned int irq); |
| 244 | extern int irq_select_affinity(unsigned int irq); |
| 245 | |
| 246 | extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m); |
| 247 | |
| 248 | /** |
| 249 | * struct irq_affinity_notify - context for notification of IRQ affinity changes |
| 250 | * @irq: Interrupt to which notification applies |
| 251 | * @kref: Reference count, for internal use |
| 252 | * @work: Work item, for internal use |
| 253 | * @notify: Function to be called on change. This will be |
| 254 | * called in process context. |
| 255 | * @release: Function to be called on release. This will be |
| 256 | * called in process context. Once registered, the |
| 257 | * structure must only be freed when this function is |
| 258 | * called or later. |
| 259 | */ |
| 260 | struct irq_affinity_notify { |
| 261 | unsigned int irq; |
| 262 | struct kref kref; |
| 263 | struct work_struct work; |
| 264 | void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); |
| 265 | void (*release)(struct kref *ref); |
| 266 | }; |
| 267 | |
| 268 | extern int |
| 269 | irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); |
| 270 | |
| 271 | #else /* CONFIG_SMP */ |
| 272 | |
| 273 | static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m) |
| 274 | { |
| 275 | return -EINVAL; |
| 276 | } |
| 277 | |
| 278 | static inline int irq_can_set_affinity(unsigned int irq) |
| 279 | { |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static inline int irq_select_affinity(unsigned int irq) { return 0; } |
| 284 | |
| 285 | static inline int irq_set_affinity_hint(unsigned int irq, |
| 286 | const struct cpumask *m) |
| 287 | { |
| 288 | return -EINVAL; |
| 289 | } |
| 290 | #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */ |
| 291 | |
| 292 | #ifdef CONFIG_GENERIC_HARDIRQS |
| 293 | /* |
| 294 | * Special lockdep variants of irq disabling/enabling. |
| 295 | * These should be used for locking constructs that |
| 296 | * know that a particular irq context which is disabled, |
| 297 | * and which is the only irq-context user of a lock, |
| 298 | * that it's safe to take the lock in the irq-disabled |
| 299 | * section without disabling hardirqs. |
| 300 | * |
| 301 | * On !CONFIG_LOCKDEP they are equivalent to the normal |
| 302 | * irq disable/enable methods. |
| 303 | */ |
| 304 | static inline void disable_irq_nosync_lockdep(unsigned int irq) |
| 305 | { |
| 306 | disable_irq_nosync(irq); |
| 307 | #ifdef CONFIG_LOCKDEP |
| 308 | local_irq_disable(); |
| 309 | #endif |
| 310 | } |
| 311 | |
| 312 | static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags) |
| 313 | { |
| 314 | disable_irq_nosync(irq); |
| 315 | #ifdef CONFIG_LOCKDEP |
| 316 | local_irq_save(*flags); |
| 317 | #endif |
| 318 | } |
| 319 | |
| 320 | static inline void disable_irq_lockdep(unsigned int irq) |
| 321 | { |
| 322 | disable_irq(irq); |
| 323 | #ifdef CONFIG_LOCKDEP |
| 324 | local_irq_disable(); |
| 325 | #endif |
| 326 | } |
| 327 | |
| 328 | static inline void enable_irq_lockdep(unsigned int irq) |
| 329 | { |
| 330 | #ifdef CONFIG_LOCKDEP |
| 331 | local_irq_enable(); |
| 332 | #endif |
| 333 | enable_irq(irq); |
| 334 | } |
| 335 | |
| 336 | static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags) |
| 337 | { |
| 338 | #ifdef CONFIG_LOCKDEP |
| 339 | local_irq_restore(*flags); |
| 340 | #endif |
| 341 | enable_irq(irq); |
| 342 | } |
| 343 | |
| 344 | /* IRQ wakeup (PM) control: */ |
| 345 | extern int irq_set_irq_wake(unsigned int irq, unsigned int on); |
| 346 | |
| 347 | static inline int enable_irq_wake(unsigned int irq) |
| 348 | { |
| 349 | return irq_set_irq_wake(irq, 1); |
| 350 | } |
| 351 | |
| 352 | static inline int disable_irq_wake(unsigned int irq) |
| 353 | { |
| 354 | return irq_set_irq_wake(irq, 0); |
| 355 | } |
| 356 | |
| 357 | #else /* !CONFIG_GENERIC_HARDIRQS */ |
| 358 | /* |
| 359 | * NOTE: non-genirq architectures, if they want to support the lock |
| 360 | * validator need to define the methods below in their asm/irq.h |
| 361 | * files, under an #ifdef CONFIG_LOCKDEP section. |
| 362 | */ |
| 363 | #ifndef CONFIG_LOCKDEP |
| 364 | # define disable_irq_nosync_lockdep(irq) disable_irq_nosync(irq) |
| 365 | # define disable_irq_nosync_lockdep_irqsave(irq, flags) \ |
| 366 | disable_irq_nosync(irq) |
| 367 | # define disable_irq_lockdep(irq) disable_irq(irq) |
| 368 | # define enable_irq_lockdep(irq) enable_irq(irq) |
| 369 | # define enable_irq_lockdep_irqrestore(irq, flags) \ |
| 370 | enable_irq(irq) |
| 371 | # endif |
| 372 | |
| 373 | static inline int enable_irq_wake(unsigned int irq) |
| 374 | { |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | static inline int disable_irq_wake(unsigned int irq) |
| 379 | { |
| 380 | return 0; |
| 381 | } |
| 382 | #endif /* CONFIG_GENERIC_HARDIRQS */ |
| 383 | |
| 384 | |
| 385 | #ifdef CONFIG_IRQ_FORCED_THREADING |
| 386 | extern bool force_irqthreads; |
| 387 | #else |
| 388 | #define force_irqthreads (0) |
| 389 | #endif |
| 390 | |
| 391 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
| 392 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) |
| 393 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) |
| 394 | #endif |
| 395 | |
| 396 | /* Some architectures might implement lazy enabling/disabling of |
| 397 | * interrupts. In some cases, such as stop_machine, we might want |
| 398 | * to ensure that after a local_irq_disable(), interrupts have |
| 399 | * really been disabled in hardware. Such architectures need to |
| 400 | * implement the following hook. |
| 401 | */ |
| 402 | #ifndef hard_irq_disable |
| 403 | #define hard_irq_disable() do { } while(0) |
| 404 | #endif |
| 405 | |
| 406 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high |
| 407 | frequency threaded job scheduling. For almost all the purposes |
| 408 | tasklets are more than enough. F.e. all serial device BHs et |
| 409 | al. should be converted to tasklets, not to softirqs. |
| 410 | */ |
| 411 | |
| 412 | enum |
| 413 | { |
| 414 | HI_SOFTIRQ=0, |
| 415 | TIMER_SOFTIRQ, |
| 416 | NET_TX_SOFTIRQ, |
| 417 | NET_RX_SOFTIRQ, |
| 418 | BLOCK_SOFTIRQ, |
| 419 | BLOCK_IOPOLL_SOFTIRQ, |
| 420 | TASKLET_SOFTIRQ, |
| 421 | SCHED_SOFTIRQ, |
| 422 | HRTIMER_SOFTIRQ, |
| 423 | RCU_SOFTIRQ, /* Preferable RCU should always be the last softirq */ |
| 424 | |
| 425 | NR_SOFTIRQS |
| 426 | }; |
| 427 | |
| 428 | #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ)) |
| 429 | |
| 430 | /* map softirq index to softirq name. update 'softirq_to_name' in |
| 431 | * kernel/softirq.c when adding a new softirq. |
| 432 | */ |
| 433 | extern char *softirq_to_name[NR_SOFTIRQS]; |
| 434 | |
| 435 | /* softirq mask and active fields moved to irq_cpustat_t in |
| 436 | * asm/hardirq.h to get better cache usage. KAO |
| 437 | */ |
| 438 | |
| 439 | struct softirq_action |
| 440 | { |
| 441 | void (*action)(struct softirq_action *); |
| 442 | }; |
| 443 | |
| 444 | asmlinkage void do_softirq(void); |
| 445 | asmlinkage void __do_softirq(void); |
| 446 | extern void open_softirq(int nr, void (*action)(struct softirq_action *)); |
| 447 | extern void softirq_init(void); |
| 448 | extern void __raise_softirq_irqoff(unsigned int nr); |
| 449 | |
| 450 | extern void raise_softirq_irqoff(unsigned int nr); |
| 451 | extern void raise_softirq(unsigned int nr); |
| 452 | |
| 453 | /* This is the worklist that queues up per-cpu softirq work. |
| 454 | * |
| 455 | * send_remote_sendirq() adds work to these lists, and |
| 456 | * the softirq handler itself dequeues from them. The queues |
| 457 | * are protected by disabling local cpu interrupts and they must |
| 458 | * only be accessed by the local cpu that they are for. |
| 459 | */ |
| 460 | DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list); |
| 461 | |
| 462 | DECLARE_PER_CPU(struct task_struct *, ksoftirqd); |
| 463 | |
| 464 | static inline struct task_struct *this_cpu_ksoftirqd(void) |
| 465 | { |
| 466 | return this_cpu_read(ksoftirqd); |
| 467 | } |
| 468 | |
| 469 | /* Try to send a softirq to a remote cpu. If this cannot be done, the |
| 470 | * work will be queued to the local cpu. |
| 471 | */ |
| 472 | extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq); |
| 473 | |
| 474 | /* Like send_remote_softirq(), but the caller must disable local cpu interrupts |
| 475 | * and compute the current cpu, passed in as 'this_cpu'. |
| 476 | */ |
| 477 | extern void __send_remote_softirq(struct call_single_data *cp, int cpu, |
| 478 | int this_cpu, int softirq); |
| 479 | |
| 480 | /* Tasklets --- multithreaded analogue of BHs. |
| 481 | |
| 482 | Main feature differing them of generic softirqs: tasklet |
| 483 | is running only on one CPU simultaneously. |
| 484 | |
| 485 | Main feature differing them of BHs: different tasklets |
| 486 | may be run simultaneously on different CPUs. |
| 487 | |
| 488 | Properties: |
| 489 | * If tasklet_schedule() is called, then tasklet is guaranteed |
| 490 | to be executed on some cpu at least once after this. |
| 491 | * If the tasklet is already scheduled, but its execution is still not |
| 492 | started, it will be executed only once. |
| 493 | * If this tasklet is already running on another CPU (or schedule is called |
| 494 | from tasklet itself), it is rescheduled for later. |
| 495 | * Tasklet is strictly serialized wrt itself, but not |
| 496 | wrt another tasklets. If client needs some intertask synchronization, |
| 497 | he makes it with spinlocks. |
| 498 | */ |
| 499 | |
| 500 | struct tasklet_struct |
| 501 | { |
| 502 | struct tasklet_struct *next; |
| 503 | unsigned long state; |
| 504 | atomic_t count; |
| 505 | void (*func)(unsigned long); |
| 506 | unsigned long data; |
| 507 | }; |
| 508 | |
| 509 | #define DECLARE_TASKLET(name, func, data) \ |
| 510 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } |
| 511 | |
| 512 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ |
| 513 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } |
| 514 | |
| 515 | |
| 516 | enum |
| 517 | { |
| 518 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ |
| 519 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ |
| 520 | }; |
| 521 | |
| 522 | #ifdef CONFIG_SMP |
| 523 | static inline int tasklet_trylock(struct tasklet_struct *t) |
| 524 | { |
| 525 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); |
| 526 | } |
| 527 | |
| 528 | static inline void tasklet_unlock(struct tasklet_struct *t) |
| 529 | { |
| 530 | smp_mb__before_clear_bit(); |
| 531 | clear_bit(TASKLET_STATE_RUN, &(t)->state); |
| 532 | } |
| 533 | |
| 534 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) |
| 535 | { |
| 536 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } |
| 537 | } |
| 538 | #else |
| 539 | #define tasklet_trylock(t) 1 |
| 540 | #define tasklet_unlock_wait(t) do { } while (0) |
| 541 | #define tasklet_unlock(t) do { } while (0) |
| 542 | #endif |
| 543 | |
| 544 | extern void __tasklet_schedule(struct tasklet_struct *t); |
| 545 | |
| 546 | static inline void tasklet_schedule(struct tasklet_struct *t) |
| 547 | { |
| 548 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) |
| 549 | __tasklet_schedule(t); |
| 550 | } |
| 551 | |
| 552 | extern void __tasklet_hi_schedule(struct tasklet_struct *t); |
| 553 | |
| 554 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) |
| 555 | { |
| 556 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) |
| 557 | __tasklet_hi_schedule(t); |
| 558 | } |
| 559 | |
| 560 | extern void __tasklet_hi_schedule_first(struct tasklet_struct *t); |
| 561 | |
| 562 | /* |
| 563 | * This version avoids touching any other tasklets. Needed for kmemcheck |
| 564 | * in order not to take any page faults while enqueueing this tasklet; |
| 565 | * consider VERY carefully whether you really need this or |
| 566 | * tasklet_hi_schedule()... |
| 567 | */ |
| 568 | static inline void tasklet_hi_schedule_first(struct tasklet_struct *t) |
| 569 | { |
| 570 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) |
| 571 | __tasklet_hi_schedule_first(t); |
| 572 | } |
| 573 | |
| 574 | |
| 575 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) |
| 576 | { |
| 577 | atomic_inc(&t->count); |
| 578 | smp_mb__after_atomic_inc(); |
| 579 | } |
| 580 | |
| 581 | static inline void tasklet_disable(struct tasklet_struct *t) |
| 582 | { |
| 583 | tasklet_disable_nosync(t); |
| 584 | tasklet_unlock_wait(t); |
| 585 | smp_mb(); |
| 586 | } |
| 587 | |
| 588 | static inline void tasklet_enable(struct tasklet_struct *t) |
| 589 | { |
| 590 | smp_mb__before_atomic_dec(); |
| 591 | atomic_dec(&t->count); |
| 592 | } |
| 593 | |
| 594 | static inline void tasklet_hi_enable(struct tasklet_struct *t) |
| 595 | { |
| 596 | smp_mb__before_atomic_dec(); |
| 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 | int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, |
| 618 | const enum hrtimer_mode mode) |
| 619 | { |
| 620 | return 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_HARDIRQS) && !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 | #endif |