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1da177e4 LT |
1 | /* interrupt.h */ |
2 | #ifndef _LINUX_INTERRUPT_H | |
3 | #define _LINUX_INTERRUPT_H | |
4 | ||
1da177e4 LT |
5 | #include <linux/kernel.h> |
6 | #include <linux/linkage.h> | |
7 | #include <linux/bitops.h> | |
8 | #include <linux/preempt.h> | |
9 | #include <linux/cpumask.h> | |
908dcecd | 10 | #include <linux/irqreturn.h> |
1da177e4 | 11 | #include <linux/hardirq.h> |
f037360f | 12 | #include <linux/sched.h> |
1da177e4 LT |
13 | #include <asm/atomic.h> |
14 | #include <asm/ptrace.h> | |
15 | #include <asm/system.h> | |
16 | ||
6e213616 TG |
17 | /* |
18 | * These correspond to the IORESOURCE_IRQ_* defines in | |
19 | * linux/ioport.h to select the interrupt line behaviour. When | |
20 | * requesting an interrupt without specifying a IRQF_TRIGGER, the | |
21 | * setting should be assumed to be "as already configured", which | |
22 | * may be as per machine or firmware initialisation. | |
23 | */ | |
24 | #define IRQF_TRIGGER_NONE 0x00000000 | |
25 | #define IRQF_TRIGGER_RISING 0x00000001 | |
26 | #define IRQF_TRIGGER_FALLING 0x00000002 | |
27 | #define IRQF_TRIGGER_HIGH 0x00000004 | |
28 | #define IRQF_TRIGGER_LOW 0x00000008 | |
29 | #define IRQF_TRIGGER_MASK (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \ | |
30 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) | |
31 | #define IRQF_TRIGGER_PROBE 0x00000010 | |
32 | ||
33 | /* | |
34 | * These flags used only by the kernel as part of the | |
35 | * irq handling routines. | |
36 | * | |
37 | * IRQF_DISABLED - keep irqs disabled when calling the action handler | |
38 | * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator | |
39 | * IRQF_SHARED - allow sharing the irq among several devices | |
40 | * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur | |
41 | * IRQF_TIMER - Flag to mark this interrupt as timer interrupt | |
42 | */ | |
43 | #define IRQF_DISABLED 0x00000020 | |
44 | #define IRQF_SAMPLE_RANDOM 0x00000040 | |
45 | #define IRQF_SHARED 0x00000080 | |
46 | #define IRQF_PROBE_SHARED 0x00000100 | |
47 | #define IRQF_TIMER 0x00000200 | |
48 | ||
49 | /* | |
50 | * Migration helpers. Scheduled for removal in 1/2007 | |
51 | * Do not use for new code ! | |
52 | */ | |
53 | #define SA_INTERRUPT IRQF_DISABLED | |
54 | #define SA_SAMPLE_RANDOM IRQF_SAMPLE_RANDOM | |
55 | #define SA_SHIRQ IRQF_SHARED | |
56 | #define SA_PROBEIRQ IRQF_PROBE_SHARED | |
57 | ||
58 | #define SA_TRIGGER_LOW IRQF_TRIGGER_LOW | |
59 | #define SA_TRIGGER_HIGH IRQF_TRIGGER_HIGH | |
60 | #define SA_TRIGGER_FALLING IRQF_TRIGGER_FALLING | |
61 | #define SA_TRIGGER_RISING IRQF_TRIGGER_RISING | |
62 | #define SA_TRIGGER_MASK IRQF_TRIGGER_MASK | |
63 | ||
1da177e4 LT |
64 | struct irqaction { |
65 | irqreturn_t (*handler)(int, void *, struct pt_regs *); | |
66 | unsigned long flags; | |
67 | cpumask_t mask; | |
68 | const char *name; | |
69 | void *dev_id; | |
70 | struct irqaction *next; | |
71 | int irq; | |
72 | struct proc_dir_entry *dir; | |
73 | }; | |
74 | ||
75 | extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs); | |
76 | extern int request_irq(unsigned int, | |
77 | irqreturn_t (*handler)(int, void *, struct pt_regs *), | |
78 | unsigned long, const char *, void *); | |
79 | extern void free_irq(unsigned int, void *); | |
80 | ||
81 | ||
82 | #ifdef CONFIG_GENERIC_HARDIRQS | |
83 | extern void disable_irq_nosync(unsigned int irq); | |
84 | extern void disable_irq(unsigned int irq); | |
85 | extern void enable_irq(unsigned int irq); | |
ba9a2331 TG |
86 | |
87 | /* IRQ wakeup (PM) control: */ | |
88 | extern int set_irq_wake(unsigned int irq, unsigned int on); | |
89 | ||
90 | static inline int enable_irq_wake(unsigned int irq) | |
91 | { | |
92 | return set_irq_wake(irq, 1); | |
93 | } | |
94 | ||
95 | static inline int disable_irq_wake(unsigned int irq) | |
96 | { | |
97 | return set_irq_wake(irq, 0); | |
98 | } | |
99 | ||
1da177e4 LT |
100 | #endif |
101 | ||
3f74478b AK |
102 | #ifndef __ARCH_SET_SOFTIRQ_PENDING |
103 | #define set_softirq_pending(x) (local_softirq_pending() = (x)) | |
104 | #define or_softirq_pending(x) (local_softirq_pending() |= (x)) | |
105 | #endif | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * Temporary defines for UP kernels, until all code gets fixed. | |
109 | */ | |
110 | #ifndef CONFIG_SMP | |
111 | static inline void __deprecated cli(void) | |
112 | { | |
113 | local_irq_disable(); | |
114 | } | |
115 | static inline void __deprecated sti(void) | |
116 | { | |
117 | local_irq_enable(); | |
118 | } | |
119 | static inline void __deprecated save_flags(unsigned long *x) | |
120 | { | |
121 | local_save_flags(*x); | |
122 | } | |
ef9ceab2 | 123 | #define save_flags(x) save_flags(&x) |
1da177e4 LT |
124 | static inline void __deprecated restore_flags(unsigned long x) |
125 | { | |
126 | local_irq_restore(x); | |
127 | } | |
128 | ||
129 | static inline void __deprecated save_and_cli(unsigned long *x) | |
130 | { | |
131 | local_irq_save(*x); | |
132 | } | |
133 | #define save_and_cli(x) save_and_cli(&x) | |
134 | #endif /* CONFIG_SMP */ | |
135 | ||
136 | /* SoftIRQ primitives. */ | |
137 | #define local_bh_disable() \ | |
138 | do { add_preempt_count(SOFTIRQ_OFFSET); barrier(); } while (0) | |
139 | #define __local_bh_enable() \ | |
140 | do { barrier(); sub_preempt_count(SOFTIRQ_OFFSET); } while (0) | |
141 | ||
142 | extern void local_bh_enable(void); | |
143 | ||
144 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high | |
145 | frequency threaded job scheduling. For almost all the purposes | |
146 | tasklets are more than enough. F.e. all serial device BHs et | |
147 | al. should be converted to tasklets, not to softirqs. | |
148 | */ | |
149 | ||
150 | enum | |
151 | { | |
152 | HI_SOFTIRQ=0, | |
153 | TIMER_SOFTIRQ, | |
154 | NET_TX_SOFTIRQ, | |
155 | NET_RX_SOFTIRQ, | |
ff856bad | 156 | BLOCK_SOFTIRQ, |
1da177e4 LT |
157 | TASKLET_SOFTIRQ |
158 | }; | |
159 | ||
160 | /* softirq mask and active fields moved to irq_cpustat_t in | |
161 | * asm/hardirq.h to get better cache usage. KAO | |
162 | */ | |
163 | ||
164 | struct softirq_action | |
165 | { | |
166 | void (*action)(struct softirq_action *); | |
167 | void *data; | |
168 | }; | |
169 | ||
170 | asmlinkage void do_softirq(void); | |
171 | extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data); | |
172 | extern void softirq_init(void); | |
3f74478b | 173 | #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0) |
1da177e4 LT |
174 | extern void FASTCALL(raise_softirq_irqoff(unsigned int nr)); |
175 | extern void FASTCALL(raise_softirq(unsigned int nr)); | |
176 | ||
177 | ||
178 | /* Tasklets --- multithreaded analogue of BHs. | |
179 | ||
180 | Main feature differing them of generic softirqs: tasklet | |
181 | is running only on one CPU simultaneously. | |
182 | ||
183 | Main feature differing them of BHs: different tasklets | |
184 | may be run simultaneously on different CPUs. | |
185 | ||
186 | Properties: | |
187 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
188 | to be executed on some cpu at least once after this. | |
189 | * If the tasklet is already scheduled, but its excecution is still not | |
190 | started, it will be executed only once. | |
191 | * If this tasklet is already running on another CPU (or schedule is called | |
192 | from tasklet itself), it is rescheduled for later. | |
193 | * Tasklet is strictly serialized wrt itself, but not | |
194 | wrt another tasklets. If client needs some intertask synchronization, | |
195 | he makes it with spinlocks. | |
196 | */ | |
197 | ||
198 | struct tasklet_struct | |
199 | { | |
200 | struct tasklet_struct *next; | |
201 | unsigned long state; | |
202 | atomic_t count; | |
203 | void (*func)(unsigned long); | |
204 | unsigned long data; | |
205 | }; | |
206 | ||
207 | #define DECLARE_TASKLET(name, func, data) \ | |
208 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
209 | ||
210 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
211 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
212 | ||
213 | ||
214 | enum | |
215 | { | |
216 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
217 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
218 | }; | |
219 | ||
220 | #ifdef CONFIG_SMP | |
221 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
222 | { | |
223 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
224 | } | |
225 | ||
226 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
227 | { | |
228 | smp_mb__before_clear_bit(); | |
229 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
230 | } | |
231 | ||
232 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
233 | { | |
234 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
235 | } | |
236 | #else | |
237 | #define tasklet_trylock(t) 1 | |
238 | #define tasklet_unlock_wait(t) do { } while (0) | |
239 | #define tasklet_unlock(t) do { } while (0) | |
240 | #endif | |
241 | ||
242 | extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t)); | |
243 | ||
244 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
245 | { | |
246 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
247 | __tasklet_schedule(t); | |
248 | } | |
249 | ||
250 | extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t)); | |
251 | ||
252 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
253 | { | |
254 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
255 | __tasklet_hi_schedule(t); | |
256 | } | |
257 | ||
258 | ||
259 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
260 | { | |
261 | atomic_inc(&t->count); | |
262 | smp_mb__after_atomic_inc(); | |
263 | } | |
264 | ||
265 | static inline void tasklet_disable(struct tasklet_struct *t) | |
266 | { | |
267 | tasklet_disable_nosync(t); | |
268 | tasklet_unlock_wait(t); | |
269 | smp_mb(); | |
270 | } | |
271 | ||
272 | static inline void tasklet_enable(struct tasklet_struct *t) | |
273 | { | |
274 | smp_mb__before_atomic_dec(); | |
275 | atomic_dec(&t->count); | |
276 | } | |
277 | ||
278 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
279 | { | |
280 | smp_mb__before_atomic_dec(); | |
281 | atomic_dec(&t->count); | |
282 | } | |
283 | ||
284 | extern void tasklet_kill(struct tasklet_struct *t); | |
285 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
286 | extern void tasklet_init(struct tasklet_struct *t, | |
287 | void (*func)(unsigned long), unsigned long data); | |
288 | ||
289 | /* | |
290 | * Autoprobing for irqs: | |
291 | * | |
292 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
293 | * for accurate IRQ probing during kernel initialization. They are | |
294 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
295 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
296 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
297 | * | |
298 | * For reasonably foolproof probing, use them as follows: | |
299 | * | |
300 | * 1. clear and/or mask the device's internal interrupt. | |
301 | * 2. sti(); | |
302 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
303 | * 4. enable the device and cause it to trigger an interrupt. | |
304 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
305 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
306 | * 7. service the device to clear its pending interrupt. | |
307 | * 8. loop again if paranoia is required. | |
308 | * | |
309 | * probe_irq_on() returns a mask of allocated irq's. | |
310 | * | |
311 | * probe_irq_off() takes the mask as a parameter, | |
312 | * and returns the irq number which occurred, | |
313 | * or zero if none occurred, or a negative irq number | |
314 | * if more than one irq occurred. | |
315 | */ | |
316 | ||
317 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
318 | static inline unsigned long probe_irq_on(void) | |
319 | { | |
320 | return 0; | |
321 | } | |
322 | static inline int probe_irq_off(unsigned long val) | |
323 | { | |
324 | return 0; | |
325 | } | |
326 | static inline unsigned int probe_irq_mask(unsigned long val) | |
327 | { | |
328 | return 0; | |
329 | } | |
330 | #else | |
331 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
332 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
333 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
334 | #endif | |
335 | ||
336 | #endif |