threaded interrupts 1: Rewrite the ICU interrupt code, splz, and doreti code.
[dragonfly.git] / sys / kern / kern_intr.c
CommitLineData
984263bc 1/*
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2 * Copyright (c) 2003, Matthew Dillon <dillon@backplane.com> All rights reserved.
3 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> All rights reserved.
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4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/kern/kern_intr.c,v 1.24.2.1 2001/10/14 20:05:50 luigi Exp $
ef0fdad1 27 * $DragonFly: src/sys/kern/kern_intr.c,v 1.3 2003/06/29 03:28:44 dillon Exp $
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28 *
29 */
30
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31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/malloc.h>
34#include <sys/kernel.h>
35#include <sys/sysctl.h>
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36#include <sys/thread.h>
37#include <sys/proc.h>
38#include <sys/thread2.h>
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39
40#include <machine/ipl.h>
41
42#include <sys/interrupt.h>
43
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44typedef struct intrec {
45 struct intrec *next;
46 inthand2_t *handler;
47 void *argument;
48 const char *name;
49 int intr;
50} intrec_t;
51
52static intrec_t *intlists[NHWI+NSWI];
53static thread_t ithreads[NHWI+NSWI];
54static struct thread ithread_ary[NHWI+NSWI];
984263bc 55
ef0fdad1 56static void ithread_handler(void *arg);
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57
58void
ef0fdad1 59register_swi(int intr, inthand2_t *handler, void *arg, const char *name)
984263bc 60{
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61 if (intr < NHWI || intr >= NHWI + NSWI)
62 panic("register_swi: bad intr %d", intr);
63 register_int(intr, handler, arg, name);
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64}
65
66void
ef0fdad1 67register_int(int intr, inthand2_t *handler, void *arg, const char *name)
984263bc 68{
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69 intrec_t **list;
70 intrec_t *rec;
71 thread_t td;
72
73 if (intr < 0 || intr > NHWI + NSWI)
74 panic("register_int: bad intr %d", intr);
75
76 rec = malloc(sizeof(intrec_t), M_DEVBUF, M_NOWAIT);
77 if (rec == NULL)
78 panic("register_swi: malloc failed");
79 rec->handler = handler;
80 rec->argument = arg;
81 rec->name = name;
82 rec->intr = intr;
83 rec->next = NULL;
84
85 list = &intlists[intr];
86
87 /*
88 * Create an interrupt thread if necessary, leave it in an unscheduled
89 * state.
90 */
91 if ((td = ithreads[intr]) == NULL) {
92 lwkt_create((void *)ithread_handler, (void *)intr, &ithreads[intr],
93 &ithread_ary[intr], TDF_STOPREQ, "ithread %d", intr);
94 td = ithreads[intr];
95 }
96
97 /*
98 * Add the record to the interrupt list
99 */
100 crit_enter(); /* token */
101 while (*list != NULL)
102 list = &(*list)->next;
103 *list = rec;
104 crit_exit();
105}
984263bc 106
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107void
108unregister_swi(int intr, inthand2_t *handler)
109{
110 if (intr < NHWI || intr >= NHWI + NSWI)
111 panic("register_swi: bad intr %d", intr);
112 unregister_int(intr, handler);
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113}
114
115void
ef0fdad1 116unregister_int(int intr, inthand2_t handler)
984263bc 117{
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118 intrec_t **list;
119 intrec_t *rec;
120
121 if (intr < 0 || intr > NHWI + NSWI)
122 panic("register_int: bad intr %d", intr);
123 list = &intlists[intr];
124 crit_enter();
125 while ((rec = *list) != NULL) {
126 if (rec->handler == (void *)handler) {
127 *list = rec->next;
128 break;
984263bc 129 }
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130 list = &rec->next;
131 }
132 crit_exit();
133 if (rec != NULL) {
134 free(rec, M_DEVBUF);
135 } else {
136 printf("warning: unregister_int: int %d handler %p not found\n",
137 intr, handler);
138 }
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139}
140
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141/*
142 * Dispatch an interrupt.
143 */
144void
145sched_ithd(int intr)
146{
147 thread_t td;
148
149 if ((td = ithreads[intr]) != NULL) {
150 if (intlists[intr] == NULL)
151 printf("sched_ithd: stray interrupt %d\n", intr);
152 else
153 lwkt_schedule(td);
154 } else {
155 printf("sched_ithd: stray interrupt %d\n", intr);
156 }
157}
158
159static void
160ithread_handler(void *arg)
161{
162 int intr = (int)arg;
163 intrec_t **list = &intlists[intr];
164 intrec_t *rec;
165 intrec_t *nrec;
166
167 crit_enter(); /* replaces SPLs */
168 for (;;) {
169 for (rec = *list; rec; rec = nrec) {
170 nrec = rec->next;
171 rec->handler(rec->argument);
172 }
173 ithread_done(intr);
174 KKASSERT(curthread->td_pri == TDPRI_CRIT);
175 }
176 crit_exit(); /* not reached */
177}
178
179
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180/*
181 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
182 * The data for this machine dependent, and the declarations are in machine
183 * dependent code. The layout of intrnames and intrcnt however is machine
184 * independent.
185 *
186 * We do not know the length of intrcnt and intrnames at compile time, so
187 * calculate things at run time.
188 */
189static int
190sysctl_intrnames(SYSCTL_HANDLER_ARGS)
191{
192 return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames,
193 req));
194}
195
196SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
197 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
198
199static int
200sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
201{
202 return (sysctl_handle_opaque(oidp, intrcnt,
203 (char *)eintrcnt - (char *)intrcnt, req));
204}
205
206SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
207 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");