5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
12 #include <linux/smp.h>
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>
24 #include <asm/ptrace.h>
25 #include <asm/irq_regs.h>
28 typedef void (*irq_flow_handler_t)(unsigned int irq,
29 struct irq_desc *desc);
35 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
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 */
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 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
66 #ifdef CONFIG_IRQ_PER_CPU
67 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
68 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
70 # define CHECK_IRQ_PER_CPU(var) 0
71 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
74 struct proc_dir_entry;
78 * struct irq_chip - hardware interrupt chip descriptor
80 * @name: name for /proc/interrupts
81 * @startup: start up the interrupt (defaults to ->enable if NULL)
82 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
83 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
84 * @disable: disable the interrupt (defaults to chip->mask if NULL)
85 * @ack: start of a new interrupt
86 * @mask: mask an interrupt source
87 * @mask_ack: ack and mask an interrupt source
88 * @unmask: unmask an interrupt source
89 * @eoi: end of interrupt - chip level
90 * @end: end of interrupt - flow level
91 * @set_affinity: set the CPU affinity on SMP machines
92 * @retrigger: resend an IRQ to the CPU
93 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
94 * @set_wake: enable/disable power-management wake-on of an IRQ
96 * @release: release function solely used by UML
97 * @typename: obsoleted by name, kept as migration helper
101 unsigned int (*startup)(unsigned int irq);
102 void (*shutdown)(unsigned int irq);
103 void (*enable)(unsigned int irq);
104 void (*disable)(unsigned int irq);
106 void (*ack)(unsigned int irq);
107 void (*mask)(unsigned int irq);
108 void (*mask_ack)(unsigned int irq);
109 void (*unmask)(unsigned int irq);
110 void (*eoi)(unsigned int irq);
112 void (*end)(unsigned int irq);
113 void (*set_affinity)(unsigned int irq, cpumask_t dest);
114 int (*retrigger)(unsigned int irq);
115 int (*set_type)(unsigned int irq, unsigned int flow_type);
116 int (*set_wake)(unsigned int irq, unsigned int on);
118 /* Currently used only by UML, might disappear one day.*/
119 #ifdef CONFIG_IRQ_RELEASE_METHOD
120 void (*release)(unsigned int irq, void *dev_id);
123 * For compatibility, ->typename is copied into ->name.
126 const char *typename;
130 * struct irq_desc - interrupt descriptor
132 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
133 * @chip: low level interrupt hardware access
134 * @msi_desc: MSI descriptor
135 * @handler_data: per-IRQ data for the irq_chip methods
136 * @chip_data: platform-specific per-chip private data for the chip
137 * methods, to allow shared chip implementations
138 * @action: the irq action chain
139 * @status: status information
140 * @depth: disable-depth, for nested irq_disable() calls
141 * @wake_depth: enable depth, for multiple set_irq_wake() callers
142 * @irq_count: stats field to detect stalled irqs
143 * @irqs_unhandled: stats field for spurious unhandled interrupts
144 * @last_unhandled: aging timer for unhandled count
145 * @lock: locking for SMP
146 * @affinity: IRQ affinity on SMP
147 * @cpu: cpu index useful for balancing
148 * @pending_mask: pending rebalanced interrupts
149 * @dir: /proc/irq/ procfs entry
150 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
151 * @name: flow handler name for /proc/interrupts output
154 irq_flow_handler_t handle_irq;
155 struct irq_chip *chip;
156 struct msi_desc *msi_desc;
159 struct irqaction *action; /* IRQ action list */
160 unsigned int status; /* IRQ status */
162 unsigned int depth; /* nested irq disables */
163 unsigned int wake_depth; /* nested wake enables */
164 unsigned int irq_count; /* For detecting broken IRQs */
165 unsigned int irqs_unhandled;
166 unsigned long last_unhandled; /* Aging timer for unhandled count */
172 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
173 cpumask_t pending_mask;
175 #ifdef CONFIG_PROC_FS
176 struct proc_dir_entry *dir;
179 } ____cacheline_internodealigned_in_smp;
181 extern struct irq_desc irq_desc[NR_IRQS];
184 * Migration helpers for obsolete names, they will go away:
186 #define hw_interrupt_type irq_chip
187 typedef struct irq_chip hw_irq_controller;
188 #define no_irq_type no_irq_chip
189 typedef struct irq_desc irq_desc_t;
192 * Pick up the arch-dependent methods:
194 #include <asm/hw_irq.h>
196 extern int setup_irq(unsigned int irq, struct irqaction *new);
198 #ifdef CONFIG_GENERIC_HARDIRQS
202 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
204 void set_pending_irq(unsigned int irq, cpumask_t mask);
205 void move_native_irq(int irq);
206 void move_masked_irq(int irq);
208 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
210 static inline void move_irq(int irq)
214 static inline void move_native_irq(int irq)
218 static inline void move_masked_irq(int irq)
222 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
226 #endif /* CONFIG_GENERIC_PENDING_IRQ */
228 #else /* CONFIG_SMP */
230 #define move_native_irq(x)
231 #define move_masked_irq(x)
233 #endif /* CONFIG_SMP */
235 #ifdef CONFIG_IRQBALANCE
236 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
238 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
243 extern int no_irq_affinity;
245 static inline int irq_balancing_disabled(unsigned int irq)
247 return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
250 /* Handle irq action chains: */
251 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
254 * Built-in IRQ handlers for various IRQ types,
255 * callable via desc->chip->handle_irq()
257 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
258 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
259 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
260 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
261 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
262 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
265 * Monolithic do_IRQ implementation.
267 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
268 extern unsigned int __do_IRQ(unsigned int irq);
272 * Architectures call this to let the generic IRQ layer
273 * handle an interrupt. If the descriptor is attached to an
274 * irqchip-style controller then we call the ->handle_irq() handler,
275 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
277 static inline void generic_handle_irq(unsigned int irq)
279 struct irq_desc *desc = irq_desc + irq;
281 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
282 desc->handle_irq(irq, desc);
284 if (likely(desc->handle_irq))
285 desc->handle_irq(irq, desc);
291 /* Handling of unhandled and spurious interrupts: */
292 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
295 /* Resending of interrupts :*/
296 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
298 /* Enable/disable irq debugging output: */
299 extern int noirqdebug_setup(char *str);
301 /* Checks whether the interrupt can be requested by request_irq(): */
302 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
304 /* Dummy irq-chip implementations: */
305 extern struct irq_chip no_irq_chip;
306 extern struct irq_chip dummy_irq_chip;
309 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
310 irq_flow_handler_t handle);
312 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
313 irq_flow_handler_t handle, const char *name);
316 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
319 /* caller has locked the irq_desc and both params are valid */
320 static inline void __set_irq_handler_unlocked(int irq,
321 irq_flow_handler_t handler)
323 irq_desc[irq].handle_irq = handler;
327 * Set a highlevel flow handler for a given IRQ:
330 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
332 __set_irq_handler(irq, handle, 0, NULL);
336 * Set a highlevel chained flow handler for a given IRQ.
337 * (a chained handler is automatically enabled and set to
338 * IRQ_NOREQUEST and IRQ_NOPROBE)
341 set_irq_chained_handler(unsigned int irq,
342 irq_flow_handler_t handle)
344 __set_irq_handler(irq, handle, 1, NULL);
347 extern void set_irq_noprobe(unsigned int irq);
348 extern void set_irq_probe(unsigned int irq);
350 /* Handle dynamic irq creation and destruction */
351 extern int create_irq(void);
352 extern void destroy_irq(unsigned int irq);
354 /* Test to see if a driver has successfully requested an irq */
355 static inline int irq_has_action(unsigned int irq)
357 struct irq_desc *desc = irq_desc + irq;
358 return desc->action != NULL;
361 /* Dynamic irq helper functions */
362 extern void dynamic_irq_init(unsigned int irq);
363 extern void dynamic_irq_cleanup(unsigned int irq);
365 /* Set/get chip/data for an IRQ: */
366 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
367 extern int set_irq_data(unsigned int irq, void *data);
368 extern int set_irq_chip_data(unsigned int irq, void *data);
369 extern int set_irq_type(unsigned int irq, unsigned int type);
370 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
372 #define get_irq_chip(irq) (irq_desc[irq].chip)
373 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
374 #define get_irq_data(irq) (irq_desc[irq].handler_data)
375 #define get_irq_msi(irq) (irq_desc[irq].msi_desc)
377 #endif /* CONFIG_GENERIC_HARDIRQS */
379 #endif /* !CONFIG_S390 */
381 #endif /* _LINUX_IRQ_H */