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 */
65 #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
67 #ifdef CONFIG_IRQ_PER_CPU
68 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
69 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
71 # define CHECK_IRQ_PER_CPU(var) 0
72 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
75 struct proc_dir_entry;
79 * struct irq_chip - hardware interrupt chip descriptor
81 * @name: name for /proc/interrupts
82 * @startup: start up the interrupt (defaults to ->enable if NULL)
83 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
84 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
85 * @disable: disable the interrupt (defaults to chip->mask if NULL)
86 * @ack: start of a new interrupt
87 * @mask: mask an interrupt source
88 * @mask_ack: ack and mask an interrupt source
89 * @unmask: unmask an interrupt source
90 * @eoi: end of interrupt - chip level
91 * @end: end of interrupt - flow level
92 * @set_affinity: set the CPU affinity on SMP machines
93 * @retrigger: resend an IRQ to the CPU
94 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
95 * @set_wake: enable/disable power-management wake-on of an IRQ
97 * @release: release function solely used by UML
98 * @typename: obsoleted by name, kept as migration helper
102 unsigned int (*startup)(unsigned int irq);
103 void (*shutdown)(unsigned int irq);
104 void (*enable)(unsigned int irq);
105 void (*disable)(unsigned int irq);
107 void (*ack)(unsigned int irq);
108 void (*mask)(unsigned int irq);
109 void (*mask_ack)(unsigned int irq);
110 void (*unmask)(unsigned int irq);
111 void (*eoi)(unsigned int irq);
113 void (*end)(unsigned int irq);
114 void (*set_affinity)(unsigned int irq, cpumask_t dest);
115 int (*retrigger)(unsigned int irq);
116 int (*set_type)(unsigned int irq, unsigned int flow_type);
117 int (*set_wake)(unsigned int irq, unsigned int on);
119 /* Currently used only by UML, might disappear one day.*/
120 #ifdef CONFIG_IRQ_RELEASE_METHOD
121 void (*release)(unsigned int irq, void *dev_id);
124 * For compatibility, ->typename is copied into ->name.
127 const char *typename;
130 struct timer_rand_state;
132 * struct irq_desc - interrupt descriptor
134 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
135 * @chip: low level interrupt hardware access
136 * @msi_desc: MSI descriptor
137 * @handler_data: per-IRQ data for the irq_chip methods
138 * @chip_data: platform-specific per-chip private data for the chip
139 * methods, to allow shared chip implementations
140 * @action: the irq action chain
141 * @status: status information
142 * @depth: disable-depth, for nested irq_disable() calls
143 * @wake_depth: enable depth, for multiple set_irq_wake() callers
144 * @irq_count: stats field to detect stalled irqs
145 * @irqs_unhandled: stats field for spurious unhandled interrupts
146 * @last_unhandled: aging timer for unhandled count
147 * @lock: locking for SMP
148 * @affinity: IRQ affinity on SMP
149 * @cpu: cpu index useful for balancing
150 * @pending_mask: pending rebalanced interrupts
151 * @dir: /proc/irq/ procfs entry
152 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
153 * @name: flow handler name for /proc/interrupts output
157 #ifdef CONFIG_HAVE_SPARSE_IRQ
158 struct irq_desc *next;
159 struct timer_rand_state *timer_rand_state;
161 #ifdef CONFIG_HAVE_DYN_ARRAY
162 unsigned int *kstat_irqs;
164 unsigned int kstat_irqs[NR_CPUS];
166 irq_flow_handler_t handle_irq;
167 struct irq_chip *chip;
168 struct msi_desc *msi_desc;
171 struct irqaction *action; /* IRQ action list */
172 unsigned int status; /* IRQ status */
174 unsigned int depth; /* nested irq disables */
175 unsigned int wake_depth; /* nested wake enables */
176 unsigned int irq_count; /* For detecting broken IRQs */
177 unsigned int irqs_unhandled;
178 unsigned long last_unhandled; /* Aging timer for unhandled count */
184 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
185 cpumask_t pending_mask;
187 #ifdef CONFIG_PROC_FS
188 struct proc_dir_entry *dir;
191 } ____cacheline_internodealigned_in_smp;
193 extern struct irq_desc *irq_to_desc(unsigned int irq);
194 extern struct irq_desc *__irq_to_desc(unsigned int irq);
196 #ifndef CONFIG_HAVE_SPARSE_IRQ
198 #ifndef CONFIG_HAVE_DYN_ARRAY
199 /* could be removed if we get rid of all irq_desc reference */
200 extern struct irq_desc irq_desc[NR_IRQS];
202 extern struct irq_desc *irq_desc;
207 extern struct irq_desc *sparse_irqs;
211 #define kstat_irqs_this_cpu(DESC) \
212 ((DESC)->kstat_irqs[smp_processor_id()])
215 * Migration helpers for obsolete names, they will go away:
217 #define hw_interrupt_type irq_chip
218 typedef struct irq_chip hw_irq_controller;
219 #define no_irq_type no_irq_chip
220 typedef struct irq_desc irq_desc_t;
223 * Pick up the arch-dependent methods:
225 #include <asm/hw_irq.h>
227 extern int setup_irq(unsigned int irq, struct irqaction *new);
229 #ifdef CONFIG_GENERIC_HARDIRQS
233 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
235 void set_pending_irq(unsigned int irq, cpumask_t mask);
236 void move_native_irq(int irq);
237 void move_masked_irq(int irq);
239 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
241 static inline void move_irq(int irq)
245 static inline void move_native_irq(int irq)
249 static inline void move_masked_irq(int irq)
253 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
257 #endif /* CONFIG_GENERIC_PENDING_IRQ */
259 #else /* CONFIG_SMP */
261 #define move_native_irq(x)
262 #define move_masked_irq(x)
264 #endif /* CONFIG_SMP */
266 #ifdef CONFIG_IRQBALANCE
267 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
269 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
274 extern int no_irq_affinity;
276 static inline int irq_balancing_disabled(unsigned int irq)
278 struct irq_desc *desc;
280 desc = irq_to_desc(irq);
281 return desc->status & IRQ_NO_BALANCING_MASK;
284 /* Handle irq action chains: */
285 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
288 * Built-in IRQ handlers for various IRQ types,
289 * callable via desc->chip->handle_irq()
291 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
292 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
293 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
294 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
295 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
296 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
299 * Monolithic do_IRQ implementation.
301 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
302 extern unsigned int __do_IRQ(unsigned int irq);
306 * Architectures call this to let the generic IRQ layer
307 * handle an interrupt. If the descriptor is attached to an
308 * irqchip-style controller then we call the ->handle_irq() handler,
309 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
311 static inline void generic_handle_irq(unsigned int irq)
313 struct irq_desc *desc = irq_to_desc(irq);
315 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
316 desc->handle_irq(irq, desc);
318 if (likely(desc->handle_irq))
319 desc->handle_irq(irq, desc);
325 /* Handling of unhandled and spurious interrupts: */
326 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
329 /* Resending of interrupts :*/
330 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
332 /* Enable/disable irq debugging output: */
333 extern int noirqdebug_setup(char *str);
335 /* Checks whether the interrupt can be requested by request_irq(): */
336 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
338 /* Dummy irq-chip implementations: */
339 extern struct irq_chip no_irq_chip;
340 extern struct irq_chip dummy_irq_chip;
343 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
344 irq_flow_handler_t handle);
346 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
347 irq_flow_handler_t handle, const char *name);
350 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
353 /* caller has locked the irq_desc and both params are valid */
354 static inline void __set_irq_handler_unlocked(int irq,
355 irq_flow_handler_t handler)
357 struct irq_desc *desc;
359 desc = irq_to_desc(irq);
360 desc->handle_irq = handler;
364 * Set a highlevel flow handler for a given IRQ:
367 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
369 __set_irq_handler(irq, handle, 0, NULL);
373 * Set a highlevel chained flow handler for a given IRQ.
374 * (a chained handler is automatically enabled and set to
375 * IRQ_NOREQUEST and IRQ_NOPROBE)
378 set_irq_chained_handler(unsigned int irq,
379 irq_flow_handler_t handle)
381 __set_irq_handler(irq, handle, 1, NULL);
384 extern void set_irq_noprobe(unsigned int irq);
385 extern void set_irq_probe(unsigned int irq);
387 /* Handle dynamic irq creation and destruction */
388 extern int create_irq(void);
389 extern void destroy_irq(unsigned int irq);
391 /* Test to see if a driver has successfully requested an irq */
392 static inline int irq_has_action(unsigned int irq)
394 struct irq_desc *desc = irq_to_desc(irq);
395 return desc->action != NULL;
398 /* Dynamic irq helper functions */
399 extern void dynamic_irq_init(unsigned int irq);
400 extern void dynamic_irq_cleanup(unsigned int irq);
402 /* Set/get chip/data for an IRQ: */
403 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
404 extern int set_irq_data(unsigned int irq, void *data);
405 extern int set_irq_chip_data(unsigned int irq, void *data);
406 extern int set_irq_type(unsigned int irq, unsigned int type);
407 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
409 #define get_irq_chip(irq) (irq_to_desc(irq)->chip)
410 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
411 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
412 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
414 #endif /* CONFIG_GENERIC_HARDIRQS */
416 #endif /* !CONFIG_S390 */
418 #endif /* _LINUX_IRQ_H */