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>
23 #include <asm/ptrace.h>
28 * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h
32 #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
33 #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
34 #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
35 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
36 #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
37 #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
38 #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
39 #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
42 #define IRQ_INPROGRESS 0x00010000 /* IRQ handler active - do not enter! */
43 #define IRQ_DISABLED 0x00020000 /* IRQ disabled - do not enter! */
44 #define IRQ_PENDING 0x00040000 /* IRQ pending - replay on enable */
45 #define IRQ_REPLAY 0x00080000 /* IRQ has been replayed but not acked yet */
46 #define IRQ_AUTODETECT 0x00100000 /* IRQ is being autodetected */
47 #define IRQ_WAITING 0x00200000 /* IRQ not yet seen - for autodetection */
48 #define IRQ_LEVEL 0x00400000 /* IRQ level triggered */
49 #define IRQ_MASKED 0x00800000 /* IRQ masked - shouldn't be seen again */
50 #ifdef CONFIG_IRQ_PER_CPU
51 # define IRQ_PER_CPU 0x01000000 /* IRQ is per CPU */
52 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
54 # define CHECK_IRQ_PER_CPU(var) 0
57 #define IRQ_NOPROBE 0x02000000 /* IRQ is not valid for probing */
58 #define IRQ_NOREQUEST 0x04000000 /* IRQ cannot be requested */
59 #define IRQ_NOAUTOEN 0x08000000 /* IRQ will not be enabled on request irq */
60 #define IRQ_DELAYED_DISABLE 0x10000000 /* IRQ disable (masking) happens delayed. */
62 struct proc_dir_entry;
65 * struct irq_chip - hardware interrupt chip descriptor
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
83 * @release: release function solely used by UML
84 * @typename: obsoleted by name, kept as migration helper
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);
93 void (*ack)(unsigned int irq);
94 void (*mask)(unsigned int irq);
95 void (*mask_ack)(unsigned int irq);
96 void (*unmask)(unsigned int irq);
97 void (*eoi)(unsigned int irq);
99 void (*end)(unsigned int irq);
100 void (*set_affinity)(unsigned int irq, cpumask_t dest);
101 int (*retrigger)(unsigned int irq);
102 int (*set_type)(unsigned int irq, unsigned int flow_type);
103 int (*set_wake)(unsigned int irq, unsigned int on);
105 /* Currently used only by UML, might disappear one day.*/
106 #ifdef CONFIG_IRQ_RELEASE_METHOD
107 void (*release)(unsigned int irq, void *dev_id);
110 * For compatibility, ->typename is copied into ->name.
113 const char *typename;
117 * struct irq_desc - interrupt descriptor
119 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
120 * @chip: low level interrupt hardware access
121 * @handler_data: per-IRQ data for the irq_chip methods
122 * @chip_data: platform-specific per-chip private data for the chip
123 * methods, to allow shared chip implementations
124 * @action: the irq action chain
125 * @status: status information
126 * @depth: disable-depth, for nested irq_disable() calls
127 * @irq_count: stats field to detect stalled irqs
128 * @irqs_unhandled: stats field for spurious unhandled interrupts
129 * @lock: locking for SMP
130 * @affinity: IRQ affinity on SMP
131 * @cpu: cpu index useful for balancing
132 * @pending_mask: pending rebalanced interrupts
133 * @move_irq: need to re-target IRQ destination
134 * @dir: /proc/irq/ procfs entry
135 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
137 * Pad this out to 32 bytes for cache and indexing reasons.
140 void fastcall (*handle_irq)(unsigned int irq,
141 struct irq_desc *desc,
142 struct pt_regs *regs);
143 struct irq_chip *chip;
146 struct irqaction *action; /* IRQ action list */
147 unsigned int status; /* IRQ status */
149 unsigned int depth; /* nested irq disables */
150 unsigned int irq_count; /* For detecting broken IRQs */
151 unsigned int irqs_unhandled;
157 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
158 cpumask_t pending_mask;
159 unsigned int move_irq; /* need to re-target IRQ dest */
161 #ifdef CONFIG_PROC_FS
162 struct proc_dir_entry *dir;
164 } ____cacheline_aligned;
166 extern struct irq_desc irq_desc[NR_IRQS];
169 * Migration helpers for obsolete names, they will go away:
171 #define hw_interrupt_type irq_chip
172 typedef struct irq_chip hw_irq_controller;
173 #define no_irq_type no_irq_chip
174 typedef struct irq_desc irq_desc_t;
177 * Pick up the arch-dependent methods:
179 #include <asm/hw_irq.h>
181 extern int setup_irq(unsigned int irq, struct irqaction *new);
183 #ifdef CONFIG_GENERIC_HARDIRQS
185 #ifndef handle_dynamic_tick
186 # define handle_dynamic_tick(a) do { } while (0)
190 static inline void set_native_irq_info(int irq, cpumask_t mask)
192 irq_desc[irq].affinity = mask;
195 static inline void set_native_irq_info(int irq, cpumask_t mask)
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);
207 #ifdef CONFIG_PCI_MSI
209 * Wonder why these are dummies?
210 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
211 * counter part after translating the vector to irq info. We need to perform
212 * this operation on the real irq, when we dont use vector, i.e when
213 * pci_use_vector() is false.
215 static inline void move_irq(int irq)
219 static inline void set_irq_info(int irq, cpumask_t mask)
223 #else /* CONFIG_PCI_MSI */
225 static inline void move_irq(int irq)
227 move_native_irq(irq);
230 static inline void set_irq_info(int irq, cpumask_t mask)
232 set_native_irq_info(irq, mask);
235 #endif /* CONFIG_PCI_MSI */
237 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
239 static inline void move_irq(int irq)
243 static inline void move_native_irq(int irq)
247 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
251 static inline void set_irq_info(int irq, cpumask_t mask)
253 set_native_irq_info(irq, mask);
256 #endif /* CONFIG_GENERIC_PENDING_IRQ */
258 #else /* CONFIG_SMP */
261 #define move_native_irq(x)
263 #endif /* CONFIG_SMP */
265 #ifdef CONFIG_IRQBALANCE
266 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
268 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
273 #ifdef CONFIG_AUTO_IRQ_AFFINITY
274 extern int select_smp_affinity(unsigned int irq);
276 static inline int select_smp_affinity(unsigned int irq)
282 extern int no_irq_affinity;
284 /* Handle irq action chains: */
285 extern int handle_IRQ_event(unsigned int irq, struct pt_regs *regs,
286 struct irqaction *action);
289 * Built-in IRQ handlers for various IRQ types,
290 * callable via desc->chip->handle_irq()
293 handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
295 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc,
296 struct pt_regs *regs);
298 handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
300 handle_simple_irq(unsigned int irq, struct irq_desc *desc,
301 struct pt_regs *regs);
303 handle_percpu_irq(unsigned int irq, struct irq_desc *desc,
304 struct pt_regs *regs);
306 handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs);
309 * Get a descriptive string for the highlevel handler, for
310 * /proc/interrupts output:
313 handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *,
317 * Monolithic do_IRQ implementation.
318 * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
320 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
323 * Architectures call this to let the generic IRQ layer
324 * handle an interrupt. If the descriptor is attached to an
325 * irqchip-style controller then we call the ->handle_irq() handler,
326 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
328 static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
330 struct irq_desc *desc = irq_desc + irq;
332 if (likely(desc->handle_irq))
333 desc->handle_irq(irq, desc, regs);
338 /* Handling of unhandled and spurious interrupts: */
339 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
340 int action_ret, struct pt_regs *regs);
342 /* Resending of interrupts :*/
343 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
345 /* Initialize /proc/irq/ */
346 extern void init_irq_proc(void);
348 /* Enable/disable irq debugging output: */
349 extern int noirqdebug_setup(char *str);
351 /* Checks whether the interrupt can be requested by request_irq(): */
352 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
354 /* Dummy irq-chip implementations: */
355 extern struct irq_chip no_irq_chip;
356 extern struct irq_chip dummy_irq_chip;
359 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
360 void fastcall (*handle)(unsigned int,
364 __set_irq_handler(unsigned int irq,
365 void fastcall (*handle)(unsigned int, struct irq_desc *,
370 * Set a highlevel flow handler for a given IRQ:
373 set_irq_handler(unsigned int irq,
374 void fastcall (*handle)(unsigned int, struct irq_desc *,
377 __set_irq_handler(irq, handle, 0);
381 * Set a highlevel chained flow handler for a given IRQ.
382 * (a chained handler is automatically enabled and set to
383 * IRQ_NOREQUEST and IRQ_NOPROBE)
386 set_irq_chained_handler(unsigned int irq,
387 void fastcall (*handle)(unsigned int, struct irq_desc *,
390 __set_irq_handler(irq, handle, 1);
393 /* 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);
400 #define get_irq_chip(irq) (irq_desc[irq].chip)
401 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
402 #define get_irq_data(irq) (irq_desc[irq].handler_data)
404 #endif /* CONFIG_GENERIC_HARDIRQS */
406 #endif /* !CONFIG_S390 */
408 #endif /* _LINUX_IRQ_H */