source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/include/linux/interrupt.h @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 11.5 KB
Line 
1/* interrupt.h */
2#ifndef _LINUX_INTERRUPT_H
3#define _LINUX_INTERRUPT_H
4
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>
10#include <linux/irqreturn.h>
11#include <linux/hardirq.h>
12#include <linux/sched.h>
13#include <linux/irqflags.h>
14#include <asm/atomic.h>
15#include <asm/ptrace.h>
16#include <asm/system.h>
17
18/*
19 * These correspond to the IORESOURCE_IRQ_* defines in
20 * linux/ioport.h to select the interrupt line behaviour.  When
21 * requesting an interrupt without specifying a IRQF_TRIGGER, the
22 * setting should be assumed to be "as already configured", which
23 * may be as per machine or firmware initialisation.
24 */
25#define IRQF_TRIGGER_NONE       0x00000000
26#define IRQF_TRIGGER_RISING     0x00000001
27#define IRQF_TRIGGER_FALLING    0x00000002
28#define IRQF_TRIGGER_HIGH       0x00000004
29#define IRQF_TRIGGER_LOW        0x00000008
30#define IRQF_TRIGGER_MASK       (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
31                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
32#define IRQF_TRIGGER_PROBE      0x00000010
33
34/*
35 * These flags used only by the kernel as part of the
36 * irq handling routines.
37 *
38 * IRQF_DISABLED - keep irqs disabled when calling the action handler
39 * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
40 * IRQF_SHARED - allow sharing the irq among several devices
41 * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
42 * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
43 */
44#define IRQF_DISABLED           0x00000020
45#define IRQF_SAMPLE_RANDOM      0x00000040
46#define IRQF_SHARED             0x00000080
47#define IRQF_PROBE_SHARED       0x00000100
48#define IRQF_TIMER              0x00000200
49#define IRQF_PERCPU             0x00000400
50
51/*
52 * Migration helpers. Scheduled for removal in 1/2007
53 * Do not use for new code !
54 */
55#define SA_INTERRUPT            IRQF_DISABLED
56#define SA_SAMPLE_RANDOM        IRQF_SAMPLE_RANDOM
57#define SA_SHIRQ                IRQF_SHARED
58#define SA_PROBEIRQ             IRQF_PROBE_SHARED
59#define SA_PERCPU               IRQF_PERCPU
60
61#define SA_TRIGGER_LOW          IRQF_TRIGGER_LOW
62#define SA_TRIGGER_HIGH         IRQF_TRIGGER_HIGH
63#define SA_TRIGGER_FALLING      IRQF_TRIGGER_FALLING
64#define SA_TRIGGER_RISING       IRQF_TRIGGER_RISING
65#define SA_TRIGGER_MASK         IRQF_TRIGGER_MASK
66
67struct irqaction {
68        irqreturn_t (*handler)(int, void *, struct pt_regs *);
69        unsigned long flags;
70        cpumask_t mask;
71        const char *name;
72        void *dev_id;
73        struct irqaction *next;
74        int irq;
75        struct proc_dir_entry *dir;
76};
77
78extern irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs);
79extern int request_irq(unsigned int,
80                       irqreturn_t (*handler)(int, void *, struct pt_regs *),
81                       unsigned long, const char *, void *);
82extern void free_irq(unsigned int, void *);
83
84/*
85 * On lockdep we dont want to enable hardirqs in hardirq
86 * context. Use local_irq_enable_in_hardirq() to annotate
87 * kernel code that has to do this nevertheless (pretty much
88 * the only valid case is for old/broken hardware that is
89 * insanely slow).
90 *
91 * NOTE: in theory this might break fragile code that relies
92 * on hardirq delivery - in practice we dont seem to have such
93 * places left. So the only effect should be slightly increased
94 * irqs-off latencies.
95 */
96#ifdef CONFIG_LOCKDEP
97# define local_irq_enable_in_hardirq()  do { } while (0)
98#else
99# define local_irq_enable_in_hardirq()  local_irq_enable()
100#endif
101
102#ifdef CONFIG_GENERIC_HARDIRQS
103extern void disable_irq_nosync(unsigned int irq);
104extern void disable_irq(unsigned int irq);
105extern void enable_irq(unsigned int irq);
106
107/*
108 * Special lockdep variants of irq disabling/enabling.
109 * These should be used for locking constructs that
110 * know that a particular irq context which is disabled,
111 * and which is the only irq-context user of a lock,
112 * that it's safe to take the lock in the irq-disabled
113 * section without disabling hardirqs.
114 *
115 * On !CONFIG_LOCKDEP they are equivalent to the normal
116 * irq disable/enable methods.
117 */
118static inline void disable_irq_nosync_lockdep(unsigned int irq)
119{
120        disable_irq_nosync(irq);
121#ifdef CONFIG_LOCKDEP
122        local_irq_disable();
123#endif
124}
125
126static inline void disable_irq_lockdep(unsigned int irq)
127{
128        disable_irq(irq);
129#ifdef CONFIG_LOCKDEP
130        local_irq_disable();
131#endif
132}
133
134static inline void enable_irq_lockdep(unsigned int irq)
135{
136#ifdef CONFIG_LOCKDEP
137        local_irq_enable();
138#endif
139        enable_irq(irq);
140}
141
142/* IRQ wakeup (PM) control: */
143extern int set_irq_wake(unsigned int irq, unsigned int on);
144
145static inline int enable_irq_wake(unsigned int irq)
146{
147        return set_irq_wake(irq, 1);
148}
149
150static inline int disable_irq_wake(unsigned int irq)
151{
152        return set_irq_wake(irq, 0);
153}
154
155#else /* !CONFIG_GENERIC_HARDIRQS */
156/*
157 * NOTE: non-genirq architectures, if they want to support the lock
158 * validator need to define the methods below in their asm/irq.h
159 * files, under an #ifdef CONFIG_LOCKDEP section.
160 */
161# ifndef CONFIG_LOCKDEP
162#  define disable_irq_nosync_lockdep(irq)       disable_irq_nosync(irq)
163#  define disable_irq_lockdep(irq)              disable_irq(irq)
164#  define enable_irq_lockdep(irq)               enable_irq(irq)
165# endif
166
167#endif /* CONFIG_GENERIC_HARDIRQS */
168
169#ifdef CONFIG_HAVE_IRQ_IGNORE_UNHANDLED
170int irq_ignore_unhandled(unsigned int irq);
171#else
172#define irq_ignore_unhandled(irq) 0
173#endif
174
175#ifndef __ARCH_SET_SOFTIRQ_PENDING
176#define set_softirq_pending(x) (local_softirq_pending() = (x))
177#define or_softirq_pending(x)  (local_softirq_pending() |= (x))
178#endif
179
180/*
181 * Temporary defines for UP kernels, until all code gets fixed.
182 */
183#ifndef CONFIG_SMP
184static inline void __deprecated cli(void)
185{
186        local_irq_disable();
187}
188static inline void __deprecated sti(void)
189{
190        local_irq_enable();
191}
192static inline void __deprecated save_flags(unsigned long *x)
193{
194        local_save_flags(*x);
195}
196#define save_flags(x) save_flags(&x)
197static inline void __deprecated restore_flags(unsigned long x)
198{
199        local_irq_restore(x);
200}
201
202static inline void __deprecated save_and_cli(unsigned long *x)
203{
204        local_irq_save(*x);
205}
206#define save_and_cli(x) save_and_cli(&x)
207#endif /* CONFIG_SMP */
208
209extern void local_bh_disable(void);
210extern void __local_bh_enable(void);
211extern void _local_bh_enable(void);
212extern void local_bh_enable(void);
213extern void local_bh_enable_ip(unsigned long ip);
214
215/* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
216   frequency threaded job scheduling. For almost all the purposes
217   tasklets are more than enough. F.e. all serial device BHs et
218   al. should be converted to tasklets, not to softirqs.
219 */
220
221enum
222{
223        HI_SOFTIRQ=0,
224        TIMER_SOFTIRQ,
225        NET_TX_SOFTIRQ,
226        NET_RX_SOFTIRQ,
227        BLOCK_SOFTIRQ,
228        TASKLET_SOFTIRQ
229};
230
231/* softirq mask and active fields moved to irq_cpustat_t in
232 * asm/hardirq.h to get better cache usage.  KAO
233 */
234
235struct softirq_action
236{
237        void    (*action)(struct softirq_action *);
238        void    *data;
239};
240
241asmlinkage void do_softirq(void);
242extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
243extern void softirq_init(void);
244#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
245extern void FASTCALL(raise_softirq_irqoff(unsigned int nr));
246extern void FASTCALL(raise_softirq(unsigned int nr));
247
248
249/* Tasklets --- multithreaded analogue of BHs.
250
251   Main feature differing them of generic softirqs: tasklet
252   is running only on one CPU simultaneously.
253
254   Main feature differing them of BHs: different tasklets
255   may be run simultaneously on different CPUs.
256
257   Properties:
258   * If tasklet_schedule() is called, then tasklet is guaranteed
259     to be executed on some cpu at least once after this.
260   * If the tasklet is already scheduled, but its excecution is still not
261     started, it will be executed only once.
262   * If this tasklet is already running on another CPU (or schedule is called
263     from tasklet itself), it is rescheduled for later.
264   * Tasklet is strictly serialized wrt itself, but not
265     wrt another tasklets. If client needs some intertask synchronization,
266     he makes it with spinlocks.
267 */
268
269struct tasklet_struct
270{
271        struct tasklet_struct *next;
272        unsigned long state;
273        atomic_t count;
274        void (*func)(unsigned long);
275        unsigned long data;
276};
277
278#define DECLARE_TASKLET(name, func, data) \
279struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
280
281#define DECLARE_TASKLET_DISABLED(name, func, data) \
282struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
283
284
285enum
286{
287        TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
288        TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
289};
290
291#ifdef CONFIG_SMP
292static inline int tasklet_trylock(struct tasklet_struct *t)
293{
294        return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
295}
296
297static inline void tasklet_unlock(struct tasklet_struct *t)
298{
299        smp_mb__before_clear_bit(); 
300        clear_bit(TASKLET_STATE_RUN, &(t)->state);
301}
302
303static inline void tasklet_unlock_wait(struct tasklet_struct *t)
304{
305        while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
306}
307#else
308#define tasklet_trylock(t) 1
309#define tasklet_unlock_wait(t) do { } while (0)
310#define tasklet_unlock(t) do { } while (0)
311#endif
312
313extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
314
315static inline void tasklet_schedule(struct tasklet_struct *t)
316{
317        if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
318                __tasklet_schedule(t);
319}
320
321extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
322
323static inline void tasklet_hi_schedule(struct tasklet_struct *t)
324{
325        if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
326                __tasklet_hi_schedule(t);
327}
328
329
330static inline void tasklet_disable_nosync(struct tasklet_struct *t)
331{
332        atomic_inc(&t->count);
333        smp_mb__after_atomic_inc();
334}
335
336static inline void tasklet_disable(struct tasklet_struct *t)
337{
338        tasklet_disable_nosync(t);
339        tasklet_unlock_wait(t);
340        smp_mb();
341}
342
343static inline void tasklet_enable(struct tasklet_struct *t)
344{
345        smp_mb__before_atomic_dec();
346        atomic_dec(&t->count);
347}
348
349static inline void tasklet_hi_enable(struct tasklet_struct *t)
350{
351        smp_mb__before_atomic_dec();
352        atomic_dec(&t->count);
353}
354
355extern void tasklet_kill(struct tasklet_struct *t);
356extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
357extern void tasklet_init(struct tasklet_struct *t,
358                         void (*func)(unsigned long), unsigned long data);
359
360/*
361 * Autoprobing for irqs:
362 *
363 * probe_irq_on() and probe_irq_off() provide robust primitives
364 * for accurate IRQ probing during kernel initialization.  They are
365 * reasonably simple to use, are not "fooled" by spurious interrupts,
366 * and, unlike other attempts at IRQ probing, they do not get hung on
367 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
368 *
369 * For reasonably foolproof probing, use them as follows:
370 *
371 * 1. clear and/or mask the device's internal interrupt.
372 * 2. sti();
373 * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
374 * 4. enable the device and cause it to trigger an interrupt.
375 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
376 * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
377 * 7. service the device to clear its pending interrupt.
378 * 8. loop again if paranoia is required.
379 *
380 * probe_irq_on() returns a mask of allocated irq's.
381 *
382 * probe_irq_off() takes the mask as a parameter,
383 * and returns the irq number which occurred,
384 * or zero if none occurred, or a negative irq number
385 * if more than one irq occurred.
386 */
387
388#if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
389static inline unsigned long probe_irq_on(void)
390{
391        return 0;
392}
393static inline int probe_irq_off(unsigned long val)
394{
395        return 0;
396}
397static inline unsigned int probe_irq_mask(unsigned long val)
398{
399        return 0;
400}
401#else
402extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
403extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
404extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
405#endif
406
407#endif
Note: See TracBrowser for help on using the repository browser.