Generic MP rollup work.
[dragonfly.git] / sys / kern / kern_intr.c
CommitLineData
984263bc 1/*
ef0fdad1
MD
2 * Copyright (c) 2003, Matthew Dillon <dillon@backplane.com> All rights reserved.
3 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> All rights reserved.
984263bc
MD
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 $
26a0694b 27 * $DragonFly: src/sys/kern/kern_intr.c,v 1.6 2003/06/30 19:50:31 dillon Exp $
984263bc
MD
28 *
29 */
30
984263bc
MD
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>
ef0fdad1
MD
36#include <sys/thread.h>
37#include <sys/proc.h>
38#include <sys/thread2.h>
984263bc
MD
39
40#include <machine/ipl.h>
41
42#include <sys/interrupt.h>
43
ef0fdad1
MD
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);
984263bc
MD
57
58void
ef0fdad1 59register_swi(int intr, inthand2_t *handler, void *arg, const char *name)
984263bc 60{
ef0fdad1
MD
61 if (intr < NHWI || intr >= NHWI + NSWI)
62 panic("register_swi: bad intr %d", intr);
63 register_int(intr, handler, arg, name);
984263bc
MD
64}
65
66void
ef0fdad1 67register_int(int intr, inthand2_t *handler, void *arg, const char *name)
984263bc 68{
ef0fdad1
MD
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
26a0694b
MD
89 * state. The kthread restore function exits a critical section before
90 * starting the function so we need *TWO* critical sections in order
91 * for the handler to begin running in one.
ef0fdad1
MD
92 */
93 if ((td = ithreads[intr]) == NULL) {
94 lwkt_create((void *)ithread_handler, (void *)intr, &ithreads[intr],
95 &ithread_ary[intr], TDF_STOPREQ, "ithread %d", intr);
96 td = ithreads[intr];
4b5f931b 97 if (intr >= NHWI && intr < NHWI + NSWI)
26a0694b 98 lwkt_setpri(td, TDPRI_SOFT_NORM + TDPRI_CRIT * 2);
4b5f931b 99 else
26a0694b 100 lwkt_setpri(td, TDPRI_INT_MED + TDPRI_CRIT * 2);
ef0fdad1
MD
101 }
102
103 /*
104 * Add the record to the interrupt list
105 */
106 crit_enter(); /* token */
107 while (*list != NULL)
108 list = &(*list)->next;
109 *list = rec;
110 crit_exit();
111}
984263bc 112
ef0fdad1
MD
113void
114unregister_swi(int intr, inthand2_t *handler)
115{
116 if (intr < NHWI || intr >= NHWI + NSWI)
117 panic("register_swi: bad intr %d", intr);
118 unregister_int(intr, handler);
984263bc
MD
119}
120
121void
ef0fdad1 122unregister_int(int intr, inthand2_t handler)
984263bc 123{
ef0fdad1
MD
124 intrec_t **list;
125 intrec_t *rec;
126
127 if (intr < 0 || intr > NHWI + NSWI)
128 panic("register_int: bad intr %d", intr);
129 list = &intlists[intr];
130 crit_enter();
131 while ((rec = *list) != NULL) {
132 if (rec->handler == (void *)handler) {
133 *list = rec->next;
134 break;
984263bc 135 }
ef0fdad1
MD
136 list = &rec->next;
137 }
138 crit_exit();
139 if (rec != NULL) {
140 free(rec, M_DEVBUF);
141 } else {
142 printf("warning: unregister_int: int %d handler %p not found\n",
143 intr, handler);
144 }
984263bc
MD
145}
146
4b5f931b
MD
147void
148swi_setpriority(int intr, int pri)
149{
150 struct thread *td;
151
152 if (intr < NHWI || intr >= NHWI + NSWI)
153 panic("register_swi: bad intr %d", intr);
154 if ((td = ithreads[intr]) != NULL)
155 lwkt_setpri(td, pri);
156}
157
ef0fdad1 158/*
b68b7282
MD
159 * Dispatch an interrupt. If there's nothing to do we have a stray
160 * interrupt and can just return, leaving the interrupt masked.
ef0fdad1
MD
161 */
162void
163sched_ithd(int intr)
164{
165 thread_t td;
166
167 if ((td = ithreads[intr]) != NULL) {
b68b7282 168 if (intlists[intr] == NULL) {
ef0fdad1 169 printf("sched_ithd: stray interrupt %d\n", intr);
b68b7282 170 } else {
ef0fdad1 171 lwkt_schedule(td);
b68b7282
MD
172 lwkt_preempt(td, intr);
173 }
ef0fdad1
MD
174 } else {
175 printf("sched_ithd: stray interrupt %d\n", intr);
176 }
177}
178
b68b7282 179/*
26a0694b
MD
180 * Interrupt threads run this as their main loop. The handler should be
181 * in a critical section on entry.
b68b7282 182 */
ef0fdad1
MD
183static void
184ithread_handler(void *arg)
185{
186 int intr = (int)arg;
187 intrec_t **list = &intlists[intr];
188 intrec_t *rec;
189 intrec_t *nrec;
190
26a0694b 191 KKASSERT(curthread->td_pri >= TDPRI_CRIT);
ef0fdad1
MD
192 for (;;) {
193 for (rec = *list; rec; rec = nrec) {
194 nrec = rec->next;
195 rec->handler(rec->argument);
196 }
197 ithread_done(intr);
ef0fdad1 198 }
ef0fdad1
MD
199}
200
201
984263bc
MD
202/*
203 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
204 * The data for this machine dependent, and the declarations are in machine
205 * dependent code. The layout of intrnames and intrcnt however is machine
206 * independent.
207 *
208 * We do not know the length of intrcnt and intrnames at compile time, so
209 * calculate things at run time.
210 */
211static int
212sysctl_intrnames(SYSCTL_HANDLER_ARGS)
213{
214 return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames,
215 req));
216}
217
218SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
219 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
220
221static int
222sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
223{
224 return (sysctl_handle_opaque(oidp, intrcnt,
225 (char *)eintrcnt - (char *)intrcnt, req));
226}
227
228SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
229 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");