irq.h 12 KB

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