FreeBSD/Linux Kernel Cross Reference
sys/sys/interrupt.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #ifndef _SYS_INTERRUPT_H_
32 #define _SYS_INTERRUPT_H_
33
34 #include <sys/_lock.h>
35 #include <sys/_mutex.h>
36 #include <sys/ck.h>
37
38 struct intr_event;
39 struct intr_thread;
40 struct trapframe;
41
42 /*
43 * Describe a hardware interrupt handler.
44 *
45 * Multiple interrupt handlers for a specific event can be chained
46 * together.
47 */
48 struct intr_handler {
49 driver_filter_t *ih_filter; /* Filter handler function. */
50 driver_intr_t *ih_handler; /* Threaded handler function. */
51 void *ih_argument; /* Argument to pass to handlers. */
52 int ih_flags;
53 char ih_name[MAXCOMLEN + 1]; /* Name of handler. */
54 struct intr_event *ih_event; /* Event we are connected to. */
55 int ih_need; /* Needs service. */
56 CK_SLIST_ENTRY(intr_handler) ih_next; /* Next handler for this event. */
57 u_char ih_pri; /* Priority of this handler. */
58 struct intr_thread *ih_thread; /* Ithread for filtered handler. */
59 };
60
61 /* Interrupt handle flags kept in ih_flags */
62 #define IH_EXCLUSIVE 0x00000002 /* Exclusive interrupt. */
63 #define IH_ENTROPY 0x00000004 /* Device is a good entropy source. */
64 #define IH_DEAD 0x00000008 /* Handler should be removed. */
65 #define IH_SUSP 0x00000010 /* Device is powered down. */
66 #define IH_CHANGED 0x40000000 /* Handler state is changed. */
67 #define IH_MPSAFE 0x80000000 /* Handler does not need Giant. */
68
69 /*
70 * Describe an interrupt event. An event holds a list of handlers.
71 * The 'pre_ithread', 'post_ithread', 'post_filter', and 'assign_cpu'
72 * hooks are used to invoke MD code for certain operations.
73 *
74 * The 'pre_ithread' hook is called when an interrupt thread for
75 * handlers without filters is scheduled. It is responsible for
76 * ensuring that 1) the system won't be swamped with an interrupt
77 * storm from the associated source while the ithread runs and 2) the
78 * current CPU is able to receive interrupts from other interrupt
79 * sources. The first is usually accomplished by disabling
80 * level-triggered interrupts until the ithread completes. The second
81 * is accomplished on some platforms by acknowledging the interrupt
82 * via an EOI.
83 *
84 * The 'post_ithread' hook is invoked when an ithread finishes. It is
85 * responsible for ensuring that the associated interrupt source will
86 * trigger an interrupt when it is asserted in the future. Usually
87 * this is implemented by enabling a level-triggered interrupt that
88 * was previously disabled via the 'pre_ithread' hook.
89 *
90 * The 'post_filter' hook is invoked when a filter handles an
91 * interrupt. It is responsible for ensuring that the current CPU is
92 * able to receive interrupts again. On some platforms this is done
93 * by acknowledging the interrupts via an EOI.
94 *
95 * The 'assign_cpu' hook is used to bind an interrupt source to a
96 * specific CPU. If the interrupt cannot be bound, this function may
97 * return an error.
98 *
99 * Note that device drivers may also use interrupt events to manage
100 * multiplexing interrupt interrupt handler into handlers for child
101 * devices. In that case, the above hooks are not used. The device
102 * can create an event for its interrupt resource and register child
103 * event handlers with that event. It can then use
104 * intr_event_execute_handlers() to execute non-filter handlers.
105 * Currently filter handlers are not supported by this, but that can
106 * be added by splitting out the filter loop from intr_event_handle()
107 * if desired.
108 */
109 struct intr_event {
110 TAILQ_ENTRY(intr_event) ie_list;
111 CK_SLIST_HEAD(, intr_handler) ie_handlers; /* Interrupt handlers. */
112 char ie_name[MAXCOMLEN + 1]; /* Individual event name. */
113 char ie_fullname[MAXCOMLEN + 1];
114 struct mtx ie_lock;
115 void *ie_source; /* Cookie used by MD code. */
116 struct intr_thread *ie_thread; /* Thread we are connected to. */
117 void (*ie_pre_ithread)(void *);
118 void (*ie_post_ithread)(void *);
119 void (*ie_post_filter)(void *);
120 int (*ie_assign_cpu)(void *, int);
121 int ie_flags;
122 int ie_count; /* Loop counter. */
123 int ie_warncnt; /* Rate-check interrupt storm warns. */
124 struct timeval ie_warntm;
125 int ie_irq; /* Physical irq number if !SOFT. */
126 int ie_cpu; /* CPU this event is bound to. */
127 volatile int ie_phase; /* Switched to establish a barrier. */
128 volatile int ie_active[2]; /* Filters in ISR context. */
129 };
130
131 /* Interrupt event flags kept in ie_flags. */
132 #define IE_SOFT 0x000001 /* Software interrupt. */
133 #define IE_ENTROPY 0x000002 /* Interrupt is an entropy source. */
134 #define IE_ADDING_THREAD 0x000004 /* Currently building an ithread. */
135
136 /* Flags to pass to swi_sched. */
137 #define SWI_FROMNMI 0x1
138 #define SWI_DELAY 0x2
139
140 /*
141 * Software interrupt numbers in priority order. The priority determines
142 * the priority of the corresponding interrupt thread.
143 */
144 #define SWI_TTY 0
145 #define SWI_NET 1
146 #define SWI_CAMBIO 2
147 #define SWI_VM 3
148 #define SWI_CLOCK 4
149 #define SWI_TQ_FAST 5
150 #define SWI_TQ 6
151 #define SWI_TQ_GIANT 6
152
153 struct proc;
154
155 extern struct intr_event *tty_intr_event;
156 extern struct intr_event *clk_intr_event;
157 extern void *vm_ih;
158
159 /* Counts and names for statistics (defined in MD code). */
160 #if defined(__amd64__) || defined(__i386__)
161 extern u_long *intrcnt; /* counts for for each device and stray */
162 extern char *intrnames; /* string table containing device names */
163 #else
164 extern u_long intrcnt[]; /* counts for for each device and stray */
165 extern char intrnames[]; /* string table containing device names */
166 #endif
167 extern size_t sintrcnt; /* size of intrcnt table */
168 extern size_t sintrnames; /* size of intrnames table */
169
170 #ifdef DDB
171 void db_dump_intr_event(struct intr_event *ie, int handlers);
172 #endif
173 u_char intr_priority(enum intr_type flags);
174 int intr_event_add_handler(struct intr_event *ie, const char *name,
175 driver_filter_t filter, driver_intr_t handler, void *arg,
176 u_char pri, enum intr_type flags, void **cookiep);
177 int intr_event_bind(struct intr_event *ie, int cpu);
178 int intr_event_bind_irqonly(struct intr_event *ie, int cpu);
179 int intr_event_bind_ithread(struct intr_event *ie, int cpu);
180 int intr_event_create(struct intr_event **event, void *source,
181 int flags, int irq, void (*pre_ithread)(void *),
182 void (*post_ithread)(void *), void (*post_filter)(void *),
183 int (*assign_cpu)(void *, int), const char *fmt, ...)
184 __printflike(9, 10);
185 int intr_event_describe_handler(struct intr_event *ie, void *cookie,
186 const char *descr);
187 int intr_event_destroy(struct intr_event *ie);
188 int intr_event_handle(struct intr_event *ie, struct trapframe *frame);
189 int intr_event_remove_handler(void *cookie);
190 int intr_event_suspend_handler(void *cookie);
191 int intr_event_resume_handler(void *cookie);
192 int intr_getaffinity(int irq, int mode, void *mask);
193 void *intr_handler_source(void *cookie);
194 int intr_setaffinity(int irq, int mode, void *mask);
195 void _intr_drain(int irq); /* LinuxKPI only. */
196 int swi_add(struct intr_event **eventp, const char *name,
197 driver_intr_t handler, void *arg, int pri, enum intr_type flags,
198 void **cookiep);
199 void swi_sched(void *cookie, int flags);
200 int swi_remove(void *cookie);
201
202 #endif
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