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>
14 #ifndef CONFIG_GENERIC_HARDIRQS
15 # define nr_irqs NR_IRQS
17 # define for_each_irq_desc(irq, desc) \
18 for (irq = 0; irq < nr_irqs; irq++)
22 # define for_each_irq_desc(irq, desc) \
23 for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
28 #include <linux/linkage.h>
29 #include <linux/cache.h>
30 #include <linux/spinlock.h>
31 #include <linux/cpumask.h>
32 #include <linux/irqreturn.h>
33 #include <linux/errno.h>
36 #include <asm/ptrace.h>
37 #include <asm/irq_regs.h>
40 typedef void (*irq_flow_handler_t)(unsigned int irq,
41 struct irq_desc *desc);
47 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
51 #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
52 #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
53 #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
54 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
55 #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
56 #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
57 #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
58 #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
61 #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
62 #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
63 #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
64 #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
65 #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
66 #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
67 #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
68 #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
69 #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
70 #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
71 #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
72 #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
73 #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
74 #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
75 #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
76 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
77 #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
79 #ifdef CONFIG_IRQ_PER_CPU
80 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
81 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
83 # define CHECK_IRQ_PER_CPU(var) 0
84 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
87 struct proc_dir_entry;
91 * struct irq_chip - hardware interrupt chip descriptor
93 * @name: name for /proc/interrupts
94 * @startup: start up the interrupt (defaults to ->enable if NULL)
95 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
96 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
97 * @disable: disable the interrupt (defaults to chip->mask if NULL)
98 * @ack: start of a new interrupt
99 * @mask: mask an interrupt source
100 * @mask_ack: ack and mask an interrupt source
101 * @unmask: unmask an interrupt source
102 * @eoi: end of interrupt - chip level
103 * @end: end of interrupt - flow level
104 * @set_affinity: set the CPU affinity on SMP machines
105 * @retrigger: resend an IRQ to the CPU
106 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
107 * @set_wake: enable/disable power-management wake-on of an IRQ
109 * @release: release function solely used by UML
110 * @typename: obsoleted by name, kept as migration helper
114 unsigned int (*startup)(unsigned int irq);
115 void (*shutdown)(unsigned int irq);
116 void (*enable)(unsigned int irq);
117 void (*disable)(unsigned int irq);
119 void (*ack)(unsigned int irq);
120 void (*mask)(unsigned int irq);
121 void (*mask_ack)(unsigned int irq);
122 void (*unmask)(unsigned int irq);
123 void (*eoi)(unsigned int irq);
125 void (*end)(unsigned int irq);
126 void (*set_affinity)(unsigned int irq, cpumask_t dest);
127 int (*retrigger)(unsigned int irq);
128 int (*set_type)(unsigned int irq, unsigned int flow_type);
129 int (*set_wake)(unsigned int irq, unsigned int on);
131 /* Currently used only by UML, might disappear one day.*/
132 #ifdef CONFIG_IRQ_RELEASE_METHOD
133 void (*release)(unsigned int irq, void *dev_id);
136 * For compatibility, ->typename is copied into ->name.
139 const char *typename;
142 struct timer_rand_state;
145 * struct irq_desc - interrupt descriptor
147 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
148 * @chip: low level interrupt hardware access
149 * @msi_desc: MSI descriptor
150 * @handler_data: per-IRQ data for the irq_chip methods
151 * @chip_data: platform-specific per-chip private data for the chip
152 * methods, to allow shared chip implementations
153 * @action: the irq action chain
154 * @status: status information
155 * @depth: disable-depth, for nested irq_disable() calls
156 * @wake_depth: enable depth, for multiple set_irq_wake() callers
157 * @irq_count: stats field to detect stalled irqs
158 * @irqs_unhandled: stats field for spurious unhandled interrupts
159 * @last_unhandled: aging timer for unhandled count
160 * @lock: locking for SMP
161 * @affinity: IRQ affinity on SMP
162 * @cpu: cpu index useful for balancing
163 * @pending_mask: pending rebalanced interrupts
164 * @dir: /proc/irq/ procfs entry
165 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
166 * @name: flow handler name for /proc/interrupts output
170 #ifdef CONFIG_HAVE_DYN_ARRAY
171 unsigned int *kstat_irqs;
173 irq_flow_handler_t handle_irq;
174 struct irq_chip *chip;
175 struct msi_desc *msi_desc;
178 struct irqaction *action; /* IRQ action list */
179 unsigned int status; /* IRQ status */
181 unsigned int depth; /* nested irq disables */
182 unsigned int wake_depth; /* nested wake enables */
183 unsigned int irq_count; /* For detecting broken IRQs */
184 unsigned int irqs_unhandled;
185 unsigned long last_unhandled; /* Aging timer for unhandled count */
191 #ifdef CONFIG_GENERIC_PENDING_IRQ
192 cpumask_t pending_mask;
194 #ifdef CONFIG_PROC_FS
195 struct proc_dir_entry *dir;
198 } ____cacheline_internodealigned_in_smp;
201 #ifndef CONFIG_HAVE_DYN_ARRAY
202 /* could be removed if we get rid of all irq_desc reference */
203 extern struct irq_desc irq_desc[NR_IRQS];
205 extern struct irq_desc *irq_desc;
208 static inline struct irq_desc *irq_to_desc(unsigned int irq)
210 return (irq < nr_irqs) ? irq_desc + irq : NULL;
213 static inline struct irq_desc *irq_to_desc_alloc(unsigned int irq)
215 return irq_to_desc(irq);
218 #ifdef CONFIG_HAVE_DYN_ARRAY
219 #define kstat_irqs_this_cpu(DESC) \
220 ((DESC)->kstat_irqs[smp_processor_id()])
224 * Migration helpers for obsolete names, they will go away:
226 #define hw_interrupt_type irq_chip
227 typedef struct irq_chip hw_irq_controller;
228 #define no_irq_type no_irq_chip
229 typedef struct irq_desc irq_desc_t;
232 * Pick up the arch-dependent methods:
234 #include <asm/hw_irq.h>
236 extern int setup_irq(unsigned int irq, struct irqaction *new);
238 #ifdef CONFIG_GENERIC_HARDIRQS
242 #ifdef CONFIG_GENERIC_PENDING_IRQ
244 void set_pending_irq(unsigned int irq, cpumask_t mask);
245 void move_native_irq(int irq);
246 void move_masked_irq(int irq);
248 #else /* CONFIG_GENERIC_PENDING_IRQ */
250 static inline void move_irq(int irq)
254 static inline void move_native_irq(int irq)
258 static inline void move_masked_irq(int irq)
262 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
266 #endif /* CONFIG_GENERIC_PENDING_IRQ */
268 #else /* CONFIG_SMP */
270 #define move_native_irq(x)
271 #define move_masked_irq(x)
273 #endif /* CONFIG_SMP */
275 extern int no_irq_affinity;
277 static inline int irq_balancing_disabled(unsigned int irq)
279 struct irq_desc *desc;
281 desc = irq_to_desc(irq);
282 return desc->status & IRQ_NO_BALANCING_MASK;
285 /* Handle irq action chains: */
286 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
289 * Built-in IRQ handlers for various IRQ types,
290 * callable via desc->chip->handle_irq()
292 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
293 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
294 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
295 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
296 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
297 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
300 * Monolithic do_IRQ implementation.
302 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
303 extern unsigned int __do_IRQ(unsigned int irq);
307 * Architectures call this to let the generic IRQ layer
308 * handle an interrupt. If the descriptor is attached to an
309 * irqchip-style controller then we call the ->handle_irq() handler,
310 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
312 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
314 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
315 desc->handle_irq(irq, desc);
317 if (likely(desc->handle_irq))
318 desc->handle_irq(irq, desc);
324 static inline void generic_handle_irq(unsigned int irq)
326 generic_handle_irq_desc(irq, irq_to_desc(irq));
329 /* Handling of unhandled and spurious interrupts: */
330 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
333 /* Resending of interrupts :*/
334 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
336 /* Enable/disable irq debugging output: */
337 extern int noirqdebug_setup(char *str);
339 /* Checks whether the interrupt can be requested by request_irq(): */
340 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
342 /* Dummy irq-chip implementations: */
343 extern struct irq_chip no_irq_chip;
344 extern struct irq_chip dummy_irq_chip;
347 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
348 irq_flow_handler_t handle);
350 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
351 irq_flow_handler_t handle, const char *name);
354 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
357 /* caller has locked the irq_desc and both params are valid */
358 static inline void __set_irq_handler_unlocked(int irq,
359 irq_flow_handler_t handler)
361 struct irq_desc *desc;
363 desc = irq_to_desc(irq);
364 desc->handle_irq = handler;
368 * Set a highlevel flow handler for a given IRQ:
371 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
373 __set_irq_handler(irq, handle, 0, NULL);
377 * Set a highlevel chained flow handler for a given IRQ.
378 * (a chained handler is automatically enabled and set to
379 * IRQ_NOREQUEST and IRQ_NOPROBE)
382 set_irq_chained_handler(unsigned int irq,
383 irq_flow_handler_t handle)
385 __set_irq_handler(irq, handle, 1, NULL);
388 extern void set_irq_noprobe(unsigned int irq);
389 extern void set_irq_probe(unsigned int irq);
391 /* Handle dynamic irq creation and destruction */
392 extern unsigned int create_irq_nr(unsigned int irq_want);
393 extern int create_irq(void);
394 extern void destroy_irq(unsigned int irq);
396 /* Test to see if a driver has successfully requested an irq */
397 static inline int irq_has_action(unsigned int irq)
399 struct irq_desc *desc = irq_to_desc(irq);
400 return desc->action != NULL;
403 /* Dynamic irq helper functions */
404 extern void dynamic_irq_init(unsigned int irq);
405 extern void dynamic_irq_cleanup(unsigned int irq);
407 /* Set/get chip/data for an IRQ: */
408 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
409 extern int set_irq_data(unsigned int irq, void *data);
410 extern int set_irq_chip_data(unsigned int irq, void *data);
411 extern int set_irq_type(unsigned int irq, unsigned int type);
412 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
414 #define get_irq_chip(irq) (irq_to_desc(irq)->chip)
415 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
416 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
417 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
419 #endif /* CONFIG_GENERIC_HARDIRQS */
421 #endif /* !CONFIG_S390 */
423 #endif /* _LINUX_IRQ_H */