1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*-
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Berkeley Software Design Inc's name may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* From BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp
* $FreeBSD$
*/
/* Interrupt thread code. */
#include "opt_auto_eoi.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/rtprio.h> /* change this name XXX */
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/ipl.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/unistd.h>
#include <sys/errno.h>
#include <sys/interrupt.h>
#include <sys/random.h>
#include <sys/resourcevar.h>
#include <sys/time.h>
#include <machine/md_var.h>
#include <machine/segments.h>
#include <i386/isa/icu.h>
#include <isa/isavar.h>
#include <i386/isa/intr_machdep.h>
#include <sys/interrupt.h>
#include <sys/vmmeter.h>
#include <sys/ktr.h>
#include <machine/cpu.h>
struct int_entropy {
struct proc *p;
int irq;
};
static u_int straycount[NHWI];
#define MAX_STRAY_LOG 5
/*
* Schedule a heavyweight interrupt process. This function is called
* from the interrupt handlers Xintr<num>.
*/
void
sched_ithd(void *cookie)
{
int irq = (int) cookie; /* IRQ we're handling */
struct ithd *ir = ithds[irq]; /* and the process that does it */
/* This used to be in icu_vector.s */
/*
* We count software interrupts when we process them. The
* code here follows previous practice, but there's an
* argument for counting hardware interrupts when they're
* processed too.
*/
atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
/*
* If this interrupt is marked as being a source of entropy, use
* the current timestamp to feed entropy to the PRNG.
*/
if (ir != NULL && (ir->it_flags & IT_ENTROPY)) {
struct int_entropy entropy;
entropy.irq = irq;
entropy.p = curproc;
random_harvest(&entropy, sizeof(entropy), 2, 0,
RANDOM_INTERRUPT);
}
/*
* If we don't have an interrupt resource or an interrupt thread for
* this IRQ, log it as a stray interrupt.
*/
if (ir == NULL || ir->it_proc == NULL) {
if (straycount[irq] < MAX_STRAY_LOG) {
printf("stray irq %d\n", irq);
if (++straycount[irq] == MAX_STRAY_LOG)
printf(
"got %d stray irq %d's: not logging anymore\n",
MAX_STRAY_LOG, irq);
}
return;
}
CTR3(KTR_INTR, "sched_ithd pid %d(%s) need=%d",
ir->it_proc->p_pid, ir->it_proc->p_comm, ir->it_need);
/*
* Set it_need so that if the thread is already running but close
* to done, it will do another go-round. Then get the sched lock
* and see if the thread is on whichkqs yet. If not, put it on
* there. In any case, kick everyone so that if the new thread
* is higher priority than their current thread, it gets run now.
*/
ir->it_need = 1;
mtx_lock_spin(&sched_lock);
if (ir->it_proc->p_stat == SWAIT) { /* not on run queue */
CTR1(KTR_INTR, "sched_ithd: setrunqueue %d",
ir->it_proc->p_pid);
/* membar_lock(); */
ir->it_proc->p_stat = SRUN;
setrunqueue(ir->it_proc);
if (!cold) {
if (curproc != PCPU_GET(idleproc))
setrunqueue(curproc);
curproc->p_stats->p_ru.ru_nvcsw++;
mi_switch();
} else
need_resched();
}
else {
CTR3(KTR_INTR, "sched_ithd %d: it_need %d, state %d",
ir->it_proc->p_pid,
ir->it_need,
ir->it_proc->p_stat );
}
mtx_unlock_spin(&sched_lock);
}
|