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++)
25 # define for_each_irq_desc_reverse(irq, desc) \
26 for (irq = nr_irqs -1, desc = irq_desc + (nr_irqs -1 ); \
27 irq > 0; irq--, desc--)
30 #define for_each_irq_nr(irq) \
31 for (irq = 0; irq < nr_irqs; irq++)
35 #include <linux/linkage.h>
36 #include <linux/cache.h>
37 #include <linux/spinlock.h>
38 #include <linux/cpumask.h>
39 #include <linux/irqreturn.h>
40 #include <linux/errno.h>
43 #include <asm/ptrace.h>
44 #include <asm/irq_regs.h>
47 typedef void (*irq_flow_handler_t)(unsigned int irq,
48 struct irq_desc *desc);
54 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
58 #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
59 #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
60 #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
61 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
62 #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
63 #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
64 #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
65 #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
68 #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
69 #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
70 #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
71 #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
72 #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
73 #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
74 #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
75 #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
76 #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
77 #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
78 #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
79 #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
80 #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
81 #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
82 #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
83 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
84 #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
86 #ifdef CONFIG_IRQ_PER_CPU
87 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
88 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
90 # define CHECK_IRQ_PER_CPU(var) 0
91 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
94 struct proc_dir_entry;
98 * struct irq_chip - hardware interrupt chip descriptor
100 * @name: name for /proc/interrupts
101 * @startup: start up the interrupt (defaults to ->enable if NULL)
102 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
103 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
104 * @disable: disable the interrupt (defaults to chip->mask if NULL)
105 * @ack: start of a new interrupt
106 * @mask: mask an interrupt source
107 * @mask_ack: ack and mask an interrupt source
108 * @unmask: unmask an interrupt source
109 * @eoi: end of interrupt - chip level
110 * @end: end of interrupt - flow level
111 * @set_affinity: set the CPU affinity on SMP machines
112 * @retrigger: resend an IRQ to the CPU
113 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
114 * @set_wake: enable/disable power-management wake-on of an IRQ
116 * @release: release function solely used by UML
117 * @typename: obsoleted by name, kept as migration helper
121 unsigned int (*startup)(unsigned int irq);
122 void (*shutdown)(unsigned int irq);
123 void (*enable)(unsigned int irq);
124 void (*disable)(unsigned int irq);
126 void (*ack)(unsigned int irq);
127 void (*mask)(unsigned int irq);
128 void (*mask_ack)(unsigned int irq);
129 void (*unmask)(unsigned int irq);
130 void (*eoi)(unsigned int irq);
132 void (*end)(unsigned int irq);
133 void (*set_affinity)(unsigned int irq, cpumask_t dest);
134 int (*retrigger)(unsigned int irq);
135 int (*set_type)(unsigned int irq, unsigned int flow_type);
136 int (*set_wake)(unsigned int irq, unsigned int on);
138 /* Currently used only by UML, might disappear one day.*/
139 #ifdef CONFIG_IRQ_RELEASE_METHOD
140 void (*release)(unsigned int irq, void *dev_id);
143 * For compatibility, ->typename is copied into ->name.
146 const char *typename;
150 * struct irq_desc - interrupt descriptor
152 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
153 * @chip: low level interrupt hardware access
154 * @msi_desc: MSI descriptor
155 * @handler_data: per-IRQ data for the irq_chip methods
156 * @chip_data: platform-specific per-chip private data for the chip
157 * methods, to allow shared chip implementations
158 * @action: the irq action chain
159 * @status: status information
160 * @depth: disable-depth, for nested irq_disable() calls
161 * @wake_depth: enable depth, for multiple set_irq_wake() callers
162 * @irq_count: stats field to detect stalled irqs
163 * @irqs_unhandled: stats field for spurious unhandled interrupts
164 * @last_unhandled: aging timer for unhandled count
165 * @lock: locking for SMP
166 * @affinity: IRQ affinity on SMP
167 * @cpu: cpu index useful for balancing
168 * @pending_mask: pending rebalanced interrupts
169 * @dir: /proc/irq/ procfs entry
170 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
171 * @name: flow handler name for /proc/interrupts output
175 irq_flow_handler_t handle_irq;
176 struct irq_chip *chip;
177 struct msi_desc *msi_desc;
180 struct irqaction *action; /* IRQ action list */
181 unsigned int status; /* IRQ status */
183 unsigned int depth; /* nested irq disables */
184 unsigned int wake_depth; /* nested wake enables */
185 unsigned int irq_count; /* For detecting broken IRQs */
186 unsigned int irqs_unhandled;
187 unsigned long last_unhandled; /* Aging timer for unhandled count */
193 #ifdef CONFIG_GENERIC_PENDING_IRQ
194 cpumask_t pending_mask;
196 #ifdef CONFIG_PROC_FS
197 struct proc_dir_entry *dir;
200 } ____cacheline_internodealigned_in_smp;
203 extern struct irq_desc irq_desc[NR_IRQS];
205 static inline struct irq_desc *irq_to_desc(unsigned int irq)
207 return (irq < nr_irqs) ? irq_desc + irq : NULL;
211 * Migration helpers for obsolete names, they will go away:
213 #define hw_interrupt_type irq_chip
214 typedef struct irq_chip hw_irq_controller;
215 #define no_irq_type no_irq_chip
216 typedef struct irq_desc irq_desc_t;
219 * Pick up the arch-dependent methods:
221 #include <asm/hw_irq.h>
223 extern int setup_irq(unsigned int irq, struct irqaction *new);
225 #ifdef CONFIG_GENERIC_HARDIRQS
229 #ifdef CONFIG_GENERIC_PENDING_IRQ
231 void set_pending_irq(unsigned int irq, cpumask_t mask);
232 void move_native_irq(int irq);
233 void move_masked_irq(int irq);
235 #else /* CONFIG_GENERIC_PENDING_IRQ */
237 static inline void move_irq(int irq)
241 static inline void move_native_irq(int irq)
245 static inline void move_masked_irq(int irq)
249 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
253 #endif /* CONFIG_GENERIC_PENDING_IRQ */
255 #else /* CONFIG_SMP */
257 #define move_native_irq(x)
258 #define move_masked_irq(x)
260 #endif /* CONFIG_SMP */
262 extern int no_irq_affinity;
264 static inline int irq_balancing_disabled(unsigned int irq)
266 struct irq_desc *desc;
268 desc = irq_to_desc(irq);
269 return desc->status & IRQ_NO_BALANCING_MASK;
272 /* Handle irq action chains: */
273 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
276 * Built-in IRQ handlers for various IRQ types,
277 * callable via desc->chip->handle_irq()
279 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
280 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
281 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
282 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
283 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
284 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
287 * Monolithic do_IRQ implementation.
289 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
290 extern unsigned int __do_IRQ(unsigned int irq);
294 * Architectures call this to let the generic IRQ layer
295 * handle an interrupt. If the descriptor is attached to an
296 * irqchip-style controller then we call the ->handle_irq() handler,
297 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
299 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
301 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
302 desc->handle_irq(irq, desc);
304 if (likely(desc->handle_irq))
305 desc->handle_irq(irq, desc);
311 static inline void generic_handle_irq(unsigned int irq)
313 generic_handle_irq_desc(irq, irq_to_desc(irq));
316 /* Handling of unhandled and spurious interrupts: */
317 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
320 /* Resending of interrupts :*/
321 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
323 /* Enable/disable irq debugging output: */
324 extern int noirqdebug_setup(char *str);
326 /* Checks whether the interrupt can be requested by request_irq(): */
327 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
329 /* Dummy irq-chip implementations: */
330 extern struct irq_chip no_irq_chip;
331 extern struct irq_chip dummy_irq_chip;
334 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
335 irq_flow_handler_t handle);
337 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
338 irq_flow_handler_t handle, const char *name);
341 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
344 /* caller has locked the irq_desc and both params are valid */
345 static inline void __set_irq_handler_unlocked(int irq,
346 irq_flow_handler_t handler)
348 struct irq_desc *desc;
350 desc = irq_to_desc(irq);
351 desc->handle_irq = handler;
355 * Set a highlevel flow handler for a given IRQ:
358 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
360 __set_irq_handler(irq, handle, 0, NULL);
364 * Set a highlevel chained flow handler for a given IRQ.
365 * (a chained handler is automatically enabled and set to
366 * IRQ_NOREQUEST and IRQ_NOPROBE)
369 set_irq_chained_handler(unsigned int irq,
370 irq_flow_handler_t handle)
372 __set_irq_handler(irq, handle, 1, NULL);
375 extern void set_irq_noprobe(unsigned int irq);
376 extern void set_irq_probe(unsigned int irq);
378 /* Handle dynamic irq creation and destruction */
379 extern unsigned int create_irq_nr(unsigned int irq_want);
380 extern int create_irq(void);
381 extern void destroy_irq(unsigned int irq);
383 /* Test to see if a driver has successfully requested an irq */
384 static inline int irq_has_action(unsigned int irq)
386 struct irq_desc *desc = irq_to_desc(irq);
387 return desc->action != NULL;
390 /* Dynamic irq helper functions */
391 extern void dynamic_irq_init(unsigned int irq);
392 extern void dynamic_irq_cleanup(unsigned int irq);
394 /* Set/get chip/data for an IRQ: */
395 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
396 extern int set_irq_data(unsigned int irq, void *data);
397 extern int set_irq_chip_data(unsigned int irq, void *data);
398 extern int set_irq_type(unsigned int irq, unsigned int type);
399 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
401 #define get_irq_chip(irq) (irq_to_desc(irq)->chip)
402 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
403 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
404 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
406 #endif /* CONFIG_GENERIC_HARDIRQS */
408 #endif /* !CONFIG_S390 */
410 #endif /* _LINUX_IRQ_H */