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1 #ifndef _LINUX_IRQ_H
2 #define _LINUX_IRQ_H
3
4 /*
5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
7 * within this file.
8 *
9 * Thanks. --rmk
10 */
11
12 #include <linux/smp.h>
13
14 #ifndef CONFIG_S390
15
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>
22
23 #include <asm/irq.h>
24 #include <asm/ptrace.h>
25 #include <asm/irq_regs.h>
26
27 struct irq_desc;
28 typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
29 struct irq_desc *desc);
30
31
32 /*
33 * IRQ line status.
34 *
35 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
36 *
37 * IRQ types
38 */
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 */
47
48 /* Internal flags */
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
65 #ifdef CONFIG_IRQ_PER_CPU
66 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
67 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
68 #else
69 # define CHECK_IRQ_PER_CPU(var) 0
70 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
71 #endif
72
73 struct proc_dir_entry;
74 struct msi_desc;
75
76 /**
77 * struct irq_chip - hardware interrupt chip descriptor
78 *
79 * @name: name for /proc/interrupts
80 * @startup: start up the interrupt (defaults to ->enable if NULL)
81 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
82 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
83 * @disable: disable the interrupt (defaults to chip->mask if NULL)
84 * @ack: start of a new interrupt
85 * @mask: mask an interrupt source
86 * @mask_ack: ack and mask an interrupt source
87 * @unmask: unmask an interrupt source
88 * @eoi: end of interrupt - chip level
89 * @end: end of interrupt - flow level
90 * @set_affinity: set the CPU affinity on SMP machines
91 * @retrigger: resend an IRQ to the CPU
92 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
93 * @set_wake: enable/disable power-management wake-on of an IRQ
94 *
95 * @release: release function solely used by UML
96 * @typename: obsoleted by name, kept as migration helper
97 */
98 struct irq_chip {
99 const char *name;
100 unsigned int (*startup)(unsigned int irq);
101 void (*shutdown)(unsigned int irq);
102 void (*enable)(unsigned int irq);
103 void (*disable)(unsigned int irq);
104
105 void (*ack)(unsigned int irq);
106 void (*mask)(unsigned int irq);
107 void (*mask_ack)(unsigned int irq);
108 void (*unmask)(unsigned int irq);
109 void (*eoi)(unsigned int irq);
110
111 void (*end)(unsigned int irq);
112 void (*set_affinity)(unsigned int irq, cpumask_t dest);
113 int (*retrigger)(unsigned int irq);
114 int (*set_type)(unsigned int irq, unsigned int flow_type);
115 int (*set_wake)(unsigned int irq, unsigned int on);
116
117 /* Currently used only by UML, might disappear one day.*/
118 #ifdef CONFIG_IRQ_RELEASE_METHOD
119 void (*release)(unsigned int irq, void *dev_id);
120 #endif
121 /*
122 * For compatibility, ->typename is copied into ->name.
123 * Will disappear.
124 */
125 const char *typename;
126 };
127
128 /**
129 * struct irq_desc - interrupt descriptor
130 *
131 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
132 * @chip: low level interrupt hardware access
133 * @msi_desc: MSI descriptor
134 * @handler_data: per-IRQ data for the irq_chip methods
135 * @chip_data: platform-specific per-chip private data for the chip
136 * methods, to allow shared chip implementations
137 * @action: the irq action chain
138 * @status: status information
139 * @depth: disable-depth, for nested irq_disable() calls
140 * @wake_depth: enable depth, for multiple set_irq_wake() callers
141 * @irq_count: stats field to detect stalled irqs
142 * @irqs_unhandled: stats field for spurious unhandled interrupts
143 * @lock: locking for SMP
144 * @affinity: IRQ affinity on SMP
145 * @cpu: cpu index useful for balancing
146 * @pending_mask: pending rebalanced interrupts
147 * @dir: /proc/irq/ procfs entry
148 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
149 * @name: flow handler name for /proc/interrupts output
150 */
151 struct irq_desc {
152 irq_flow_handler_t handle_irq;
153 struct irq_chip *chip;
154 struct msi_desc *msi_desc;
155 void *handler_data;
156 void *chip_data;
157 struct irqaction *action; /* IRQ action list */
158 unsigned int status; /* IRQ status */
159
160 unsigned int depth; /* nested irq disables */
161 unsigned int wake_depth; /* nested wake enables */
162 unsigned int irq_count; /* For detecting broken IRQs */
163 unsigned int irqs_unhandled;
164 unsigned long last_unhandled; /* Aging timer for unhandled count */
165 spinlock_t lock;
166 #ifdef CONFIG_SMP
167 cpumask_t affinity;
168 unsigned int cpu;
169 #endif
170 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
171 cpumask_t pending_mask;
172 #endif
173 #ifdef CONFIG_PROC_FS
174 struct proc_dir_entry *dir;
175 #endif
176 const char *name;
177 } ____cacheline_internodealigned_in_smp;
178
179 extern struct irq_desc irq_desc[NR_IRQS];
180
181 /*
182 * Migration helpers for obsolete names, they will go away:
183 */
184 #define hw_interrupt_type irq_chip
185 typedef struct irq_chip hw_irq_controller;
186 #define no_irq_type no_irq_chip
187 typedef struct irq_desc irq_desc_t;
188
189 /*
190 * Pick up the arch-dependent methods:
191 */
192 #include <asm/hw_irq.h>
193
194 extern int setup_irq(unsigned int irq, struct irqaction *new);
195
196 #ifdef CONFIG_GENERIC_HARDIRQS
197
198 #ifndef handle_dynamic_tick
199 # define handle_dynamic_tick(a) do { } while (0)
200 #endif
201
202 #ifdef CONFIG_SMP
203
204 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
205
206 void set_pending_irq(unsigned int irq, cpumask_t mask);
207 void move_native_irq(int irq);
208 void move_masked_irq(int irq);
209
210 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
211
212 static inline void move_irq(int irq)
213 {
214 }
215
216 static inline void move_native_irq(int irq)
217 {
218 }
219
220 static inline void move_masked_irq(int irq)
221 {
222 }
223
224 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
225 {
226 }
227
228 #endif /* CONFIG_GENERIC_PENDING_IRQ */
229
230 extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
231 extern int irq_can_set_affinity(unsigned int irq);
232
233 #else /* CONFIG_SMP */
234
235 #define move_native_irq(x)
236 #define move_masked_irq(x)
237
238 static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
239 {
240 return -EINVAL;
241 }
242
243 static inline int irq_can_set_affinity(unsigned int irq) { return 0; }
244
245 #endif /* CONFIG_SMP */
246
247 #ifdef CONFIG_IRQBALANCE
248 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
249 #else
250 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
251 {
252 }
253 #endif
254
255 #ifdef CONFIG_AUTO_IRQ_AFFINITY
256 extern int select_smp_affinity(unsigned int irq);
257 #else
258 static inline int select_smp_affinity(unsigned int irq)
259 {
260 return 1;
261 }
262 #endif
263
264 extern int no_irq_affinity;
265
266 static inline int irq_balancing_disabled(unsigned int irq)
267 {
268 return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
269 }
270
271 /* Handle irq action chains: */
272 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
273
274 /*
275 * Built-in IRQ handlers for various IRQ types,
276 * callable via desc->chip->handle_irq()
277 */
278 extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc);
279 extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
280 extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc);
281 extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc);
282 extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
283 extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc);
284
285 /*
286 * Monolithic do_IRQ implementation.
287 * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
288 */
289 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
290 extern fastcall unsigned int __do_IRQ(unsigned int irq);
291 #endif
292
293 /*
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.
298 */
299 static inline void generic_handle_irq(unsigned int irq)
300 {
301 struct irq_desc *desc = irq_desc + irq;
302
303 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
304 desc->handle_irq(irq, desc);
305 #else
306 if (likely(desc->handle_irq))
307 desc->handle_irq(irq, desc);
308 else
309 __do_IRQ(irq);
310 #endif
311 }
312
313 /* Handling of unhandled and spurious interrupts: */
314 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
315 int action_ret);
316
317 /* Resending of interrupts :*/
318 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
319
320 /* Enable/disable irq debugging output: */
321 extern int noirqdebug_setup(char *str);
322
323 /* Checks whether the interrupt can be requested by request_irq(): */
324 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
325
326 /* Dummy irq-chip implementations: */
327 extern struct irq_chip no_irq_chip;
328 extern struct irq_chip dummy_irq_chip;
329
330 extern void
331 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
332 irq_flow_handler_t handle);
333 extern void
334 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
335 irq_flow_handler_t handle, const char *name);
336
337 extern void
338 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
339 const char *name);
340
341 /*
342 * Set a highlevel flow handler for a given IRQ:
343 */
344 static inline void
345 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
346 {
347 __set_irq_handler(irq, handle, 0, NULL);
348 }
349
350 /*
351 * Set a highlevel chained flow handler for a given IRQ.
352 * (a chained handler is automatically enabled and set to
353 * IRQ_NOREQUEST and IRQ_NOPROBE)
354 */
355 static inline void
356 set_irq_chained_handler(unsigned int irq,
357 irq_flow_handler_t handle)
358 {
359 __set_irq_handler(irq, handle, 1, NULL);
360 }
361
362 /* Handle dynamic irq creation and destruction */
363 extern int create_irq(void);
364 extern void destroy_irq(unsigned int irq);
365
366 /* Test to see if a driver has successfully requested an irq */
367 static inline int irq_has_action(unsigned int irq)
368 {
369 struct irq_desc *desc = irq_desc + irq;
370 return desc->action != NULL;
371 }
372
373 /* Dynamic irq helper functions */
374 extern void dynamic_irq_init(unsigned int irq);
375 extern void dynamic_irq_cleanup(unsigned int irq);
376
377 /* Set/get chip/data for an IRQ: */
378 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
379 extern int set_irq_data(unsigned int irq, void *data);
380 extern int set_irq_chip_data(unsigned int irq, void *data);
381 extern int set_irq_type(unsigned int irq, unsigned int type);
382 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
383
384 #define get_irq_chip(irq) (irq_desc[irq].chip)
385 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data)
386 #define get_irq_data(irq) (irq_desc[irq].handler_data)
387 #define get_irq_msi(irq) (irq_desc[irq].msi_desc)
388
389 #endif /* CONFIG_GENERIC_HARDIRQS */
390
391 #endif /* !CONFIG_S390 */
392
393 #endif /* _LINUX_IRQ_H */