2 * Copyright (c) 2003, Matthew Dillon <dillon@backplane.com> All rights reserved.
3 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
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.
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.
26 * $FreeBSD: src/sys/kern/kern_intr.c,v 1.24.2.1 2001/10/14 20:05:50 luigi Exp $
27 * $DragonFly: src/sys/kern/kern_intr.c,v 1.10 2003/07/25 05:26:50 dillon Exp $
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>
36 #include <sys/thread.h>
38 #include <sys/thread2.h>
39 #include <sys/random.h>
41 #include <machine/ipl.h>
43 #include <sys/interrupt.h>
45 typedef struct intrec {
53 static intrec_t *intlists[NHWI+NSWI];
54 static thread_t ithreads[NHWI+NSWI];
55 static struct thread ithread_ary[NHWI+NSWI];
56 static struct random_softc irandom_ary[NHWI+NSWI];
57 static int irunning[NHWI+NSWI];
59 static void ithread_handler(void *arg);
62 register_swi(int intr, inthand2_t *handler, void *arg, const char *name)
64 if (intr < NHWI || intr >= NHWI + NSWI)
65 panic("register_swi: bad intr %d", intr);
66 return(register_int(intr, handler, arg, name));
70 register_int(int intr, inthand2_t *handler, void *arg, const char *name)
76 if (intr < 0 || intr > NHWI + NSWI)
77 panic("register_int: bad intr %d", intr);
79 rec = malloc(sizeof(intrec_t), M_DEVBUF, M_NOWAIT);
81 panic("register_swi: malloc failed");
82 rec->handler = handler;
88 list = &intlists[intr];
91 * Create an interrupt thread if necessary, leave it in an unscheduled
92 * state. The kthread restore function exits a critical section before
93 * starting the function so we need *TWO* critical sections in order
94 * for the handler to begin running in one.
96 if ((td = ithreads[intr]) == NULL) {
97 lwkt_create((void *)ithread_handler, (void *)intr, &ithreads[intr],
98 &ithread_ary[intr], TDF_STOPREQ, "ithread %d", intr);
100 if (intr >= NHWI && intr < NHWI + NSWI)
101 lwkt_setpri(td, TDPRI_SOFT_NORM + TDPRI_CRIT * 2);
103 lwkt_setpri(td, TDPRI_INT_MED + TDPRI_CRIT * 2);
107 * Add the record to the interrupt list
109 crit_enter(); /* token */
110 while (*list != NULL)
111 list = &(*list)->next;
118 unregister_swi(int intr, inthand2_t *handler)
120 if (intr < NHWI || intr >= NHWI + NSWI)
121 panic("register_swi: bad intr %d", intr);
122 unregister_int(intr, handler);
126 unregister_int(int intr, inthand2_t handler)
131 if (intr < 0 || intr > NHWI + NSWI)
132 panic("register_int: bad intr %d", intr);
133 list = &intlists[intr];
135 while ((rec = *list) != NULL) {
136 if (rec->handler == (void *)handler) {
146 printf("warning: unregister_int: int %d handler %p not found\n",
152 swi_setpriority(int intr, int pri)
156 if (intr < NHWI || intr >= NHWI + NSWI)
157 panic("register_swi: bad intr %d", intr);
158 if ((td = ithreads[intr]) != NULL)
159 lwkt_setpri(td, pri);
163 register_randintr(int intr)
165 struct random_softc *sc = &irandom_ary[intr];
171 unregister_randintr(int intr)
173 struct random_softc *sc = &irandom_ary[intr];
178 * Dispatch an interrupt. If there's nothing to do we have a stray
179 * interrupt and can just return, leaving the interrupt masked.
181 * We need to schedule the interrupt and set its irunning[] bit. If
182 * we are not on the interrupt thread's cpu we have to send a message
183 * to the correct cpu that will issue the desired action (interlocking
184 * with the interrupt thread's critical section).
186 * We are NOT in a critical section, which will allow the scheduled
187 * interrupt to preempt us.
190 sched_ithd_remote(void *arg)
192 sched_ithd((int)arg);
200 if ((td = ithreads[intr]) != NULL) {
201 if (intlists[intr] == NULL) {
202 printf("sched_ithd: stray interrupt %d\n", intr);
204 if (td->td_gd == mycpu) {
206 lwkt_schedule(td); /* preemption handled internally */
208 lwkt_send_ipiq(td->td_gd->gd_cpuid, sched_ithd_remote, (void *)intr);
212 printf("sched_ithd: stray interrupt %d\n", intr);
217 * Interrupt threads run this as their main loop. The handler should be
218 * in a critical section on entry.
221 ithread_handler(void *arg)
224 intrec_t **list = &intlists[intr];
227 struct random_softc *sc = &irandom_ary[intr];
229 KKASSERT(curthread->td_pri >= TDPRI_CRIT);
232 for (rec = *list; rec; rec = nrec) {
234 rec->handler(rec->argument);
237 add_interrupt_randomness(intr);
238 if (irunning[intr] == 0)
244 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
245 * The data for this machine dependent, and the declarations are in machine
246 * dependent code. The layout of intrnames and intrcnt however is machine
249 * We do not know the length of intrcnt and intrnames at compile time, so
250 * calculate things at run time.
253 sysctl_intrnames(SYSCTL_HANDLER_ARGS)
255 return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames,
259 SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
260 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
263 sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
265 return (sysctl_handle_opaque(oidp, intrcnt,
266 (char *)eintrcnt - (char *)intrcnt, req));
269 SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
270 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");