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1da177e4 LT |
1 | /* interrupt.h */ |
2 | #ifndef _LINUX_INTERRUPT_H | |
3 | #define _LINUX_INTERRUPT_H | |
4 | ||
5 | #include <linux/config.h> | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/linkage.h> | |
8 | #include <linux/bitops.h> | |
9 | #include <linux/preempt.h> | |
10 | #include <linux/cpumask.h> | |
11 | #include <linux/hardirq.h> | |
12 | #include <asm/atomic.h> | |
13 | #include <asm/ptrace.h> | |
14 | #include <asm/system.h> | |
15 | ||
16 | /* | |
17 | * For 2.4.x compatibility, 2.4.x can use | |
18 | * | |
19 | * typedef void irqreturn_t; | |
20 | * #define IRQ_NONE | |
21 | * #define IRQ_HANDLED | |
22 | * #define IRQ_RETVAL(x) | |
23 | * | |
24 | * To mix old-style and new-style irq handler returns. | |
25 | * | |
26 | * IRQ_NONE means we didn't handle it. | |
27 | * IRQ_HANDLED means that we did have a valid interrupt and handled it. | |
28 | * IRQ_RETVAL(x) selects on the two depending on x being non-zero (for handled) | |
29 | */ | |
30 | typedef int irqreturn_t; | |
31 | ||
32 | #define IRQ_NONE (0) | |
33 | #define IRQ_HANDLED (1) | |
34 | #define IRQ_RETVAL(x) ((x) != 0) | |
35 | ||
36 | struct irqaction { | |
37 | irqreturn_t (*handler)(int, void *, struct pt_regs *); | |
38 | unsigned long flags; | |
39 | cpumask_t mask; | |
40 | const char *name; | |
41 | void *dev_id; | |
42 | struct irqaction *next; | |
43 | int irq; | |
44 | struct proc_dir_entry *dir; | |
45 | }; | |
46 | ||
47 | extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs); | |
48 | extern int request_irq(unsigned int, | |
49 | irqreturn_t (*handler)(int, void *, struct pt_regs *), | |
50 | unsigned long, const char *, void *); | |
51 | extern void free_irq(unsigned int, void *); | |
52 | ||
53 | ||
54 | #ifdef CONFIG_GENERIC_HARDIRQS | |
55 | extern void disable_irq_nosync(unsigned int irq); | |
56 | extern void disable_irq(unsigned int irq); | |
57 | extern void enable_irq(unsigned int irq); | |
58 | #endif | |
59 | ||
60 | /* | |
61 | * Temporary defines for UP kernels, until all code gets fixed. | |
62 | */ | |
63 | #ifndef CONFIG_SMP | |
64 | static inline void __deprecated cli(void) | |
65 | { | |
66 | local_irq_disable(); | |
67 | } | |
68 | static inline void __deprecated sti(void) | |
69 | { | |
70 | local_irq_enable(); | |
71 | } | |
72 | static inline void __deprecated save_flags(unsigned long *x) | |
73 | { | |
74 | local_save_flags(*x); | |
75 | } | |
76 | #define save_flags(x) save_flags(&x); | |
77 | static inline void __deprecated restore_flags(unsigned long x) | |
78 | { | |
79 | local_irq_restore(x); | |
80 | } | |
81 | ||
82 | static inline void __deprecated save_and_cli(unsigned long *x) | |
83 | { | |
84 | local_irq_save(*x); | |
85 | } | |
86 | #define save_and_cli(x) save_and_cli(&x) | |
87 | #endif /* CONFIG_SMP */ | |
88 | ||
89 | /* SoftIRQ primitives. */ | |
90 | #define local_bh_disable() \ | |
91 | do { add_preempt_count(SOFTIRQ_OFFSET); barrier(); } while (0) | |
92 | #define __local_bh_enable() \ | |
93 | do { barrier(); sub_preempt_count(SOFTIRQ_OFFSET); } while (0) | |
94 | ||
95 | extern void local_bh_enable(void); | |
96 | ||
97 | /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high | |
98 | frequency threaded job scheduling. For almost all the purposes | |
99 | tasklets are more than enough. F.e. all serial device BHs et | |
100 | al. should be converted to tasklets, not to softirqs. | |
101 | */ | |
102 | ||
103 | enum | |
104 | { | |
105 | HI_SOFTIRQ=0, | |
106 | TIMER_SOFTIRQ, | |
107 | NET_TX_SOFTIRQ, | |
108 | NET_RX_SOFTIRQ, | |
109 | SCSI_SOFTIRQ, | |
110 | TASKLET_SOFTIRQ | |
111 | }; | |
112 | ||
113 | /* softirq mask and active fields moved to irq_cpustat_t in | |
114 | * asm/hardirq.h to get better cache usage. KAO | |
115 | */ | |
116 | ||
117 | struct softirq_action | |
118 | { | |
119 | void (*action)(struct softirq_action *); | |
120 | void *data; | |
121 | }; | |
122 | ||
123 | asmlinkage void do_softirq(void); | |
124 | extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data); | |
125 | extern void softirq_init(void); | |
126 | #define __raise_softirq_irqoff(nr) do { local_softirq_pending() |= 1UL << (nr); } while (0) | |
127 | extern void FASTCALL(raise_softirq_irqoff(unsigned int nr)); | |
128 | extern void FASTCALL(raise_softirq(unsigned int nr)); | |
129 | ||
130 | ||
131 | /* Tasklets --- multithreaded analogue of BHs. | |
132 | ||
133 | Main feature differing them of generic softirqs: tasklet | |
134 | is running only on one CPU simultaneously. | |
135 | ||
136 | Main feature differing them of BHs: different tasklets | |
137 | may be run simultaneously on different CPUs. | |
138 | ||
139 | Properties: | |
140 | * If tasklet_schedule() is called, then tasklet is guaranteed | |
141 | to be executed on some cpu at least once after this. | |
142 | * If the tasklet is already scheduled, but its excecution is still not | |
143 | started, it will be executed only once. | |
144 | * If this tasklet is already running on another CPU (or schedule is called | |
145 | from tasklet itself), it is rescheduled for later. | |
146 | * Tasklet is strictly serialized wrt itself, but not | |
147 | wrt another tasklets. If client needs some intertask synchronization, | |
148 | he makes it with spinlocks. | |
149 | */ | |
150 | ||
151 | struct tasklet_struct | |
152 | { | |
153 | struct tasklet_struct *next; | |
154 | unsigned long state; | |
155 | atomic_t count; | |
156 | void (*func)(unsigned long); | |
157 | unsigned long data; | |
158 | }; | |
159 | ||
160 | #define DECLARE_TASKLET(name, func, data) \ | |
161 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data } | |
162 | ||
163 | #define DECLARE_TASKLET_DISABLED(name, func, data) \ | |
164 | struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data } | |
165 | ||
166 | ||
167 | enum | |
168 | { | |
169 | TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ | |
170 | TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ | |
171 | }; | |
172 | ||
173 | #ifdef CONFIG_SMP | |
174 | static inline int tasklet_trylock(struct tasklet_struct *t) | |
175 | { | |
176 | return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); | |
177 | } | |
178 | ||
179 | static inline void tasklet_unlock(struct tasklet_struct *t) | |
180 | { | |
181 | smp_mb__before_clear_bit(); | |
182 | clear_bit(TASKLET_STATE_RUN, &(t)->state); | |
183 | } | |
184 | ||
185 | static inline void tasklet_unlock_wait(struct tasklet_struct *t) | |
186 | { | |
187 | while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } | |
188 | } | |
189 | #else | |
190 | #define tasklet_trylock(t) 1 | |
191 | #define tasklet_unlock_wait(t) do { } while (0) | |
192 | #define tasklet_unlock(t) do { } while (0) | |
193 | #endif | |
194 | ||
195 | extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t)); | |
196 | ||
197 | static inline void tasklet_schedule(struct tasklet_struct *t) | |
198 | { | |
199 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
200 | __tasklet_schedule(t); | |
201 | } | |
202 | ||
203 | extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t)); | |
204 | ||
205 | static inline void tasklet_hi_schedule(struct tasklet_struct *t) | |
206 | { | |
207 | if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) | |
208 | __tasklet_hi_schedule(t); | |
209 | } | |
210 | ||
211 | ||
212 | static inline void tasklet_disable_nosync(struct tasklet_struct *t) | |
213 | { | |
214 | atomic_inc(&t->count); | |
215 | smp_mb__after_atomic_inc(); | |
216 | } | |
217 | ||
218 | static inline void tasklet_disable(struct tasklet_struct *t) | |
219 | { | |
220 | tasklet_disable_nosync(t); | |
221 | tasklet_unlock_wait(t); | |
222 | smp_mb(); | |
223 | } | |
224 | ||
225 | static inline void tasklet_enable(struct tasklet_struct *t) | |
226 | { | |
227 | smp_mb__before_atomic_dec(); | |
228 | atomic_dec(&t->count); | |
229 | } | |
230 | ||
231 | static inline void tasklet_hi_enable(struct tasklet_struct *t) | |
232 | { | |
233 | smp_mb__before_atomic_dec(); | |
234 | atomic_dec(&t->count); | |
235 | } | |
236 | ||
237 | extern void tasklet_kill(struct tasklet_struct *t); | |
238 | extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); | |
239 | extern void tasklet_init(struct tasklet_struct *t, | |
240 | void (*func)(unsigned long), unsigned long data); | |
241 | ||
242 | /* | |
243 | * Autoprobing for irqs: | |
244 | * | |
245 | * probe_irq_on() and probe_irq_off() provide robust primitives | |
246 | * for accurate IRQ probing during kernel initialization. They are | |
247 | * reasonably simple to use, are not "fooled" by spurious interrupts, | |
248 | * and, unlike other attempts at IRQ probing, they do not get hung on | |
249 | * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards). | |
250 | * | |
251 | * For reasonably foolproof probing, use them as follows: | |
252 | * | |
253 | * 1. clear and/or mask the device's internal interrupt. | |
254 | * 2. sti(); | |
255 | * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs | |
256 | * 4. enable the device and cause it to trigger an interrupt. | |
257 | * 5. wait for the device to interrupt, using non-intrusive polling or a delay. | |
258 | * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple | |
259 | * 7. service the device to clear its pending interrupt. | |
260 | * 8. loop again if paranoia is required. | |
261 | * | |
262 | * probe_irq_on() returns a mask of allocated irq's. | |
263 | * | |
264 | * probe_irq_off() takes the mask as a parameter, | |
265 | * and returns the irq number which occurred, | |
266 | * or zero if none occurred, or a negative irq number | |
267 | * if more than one irq occurred. | |
268 | */ | |
269 | ||
270 | #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE) | |
271 | static inline unsigned long probe_irq_on(void) | |
272 | { | |
273 | return 0; | |
274 | } | |
275 | static inline int probe_irq_off(unsigned long val) | |
276 | { | |
277 | return 0; | |
278 | } | |
279 | static inline unsigned int probe_irq_mask(unsigned long val) | |
280 | { | |
281 | return 0; | |
282 | } | |
283 | #else | |
284 | extern unsigned long probe_irq_on(void); /* returns 0 on failure */ | |
285 | extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */ | |
286 | extern unsigned int probe_irq_mask(unsigned long); /* returns mask of ISA interrupts */ | |
287 | #endif | |
288 | ||
289 | #endif |