1 /* $OpenBSD: subr_evcount.c,v 1.8 2006/10/17 10:29:50 grange Exp $ */
2 /*
3 * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
4 * Copyright (c) 2004 Aaron Campbell <aaron@openbsd.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 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/evcount.h>
30 #include <sys/timeout.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/sysctl.h>
34
35 static TAILQ_HEAD(,evcount) evcount_list;
36
37 /*
38 * Standard evcount parents.
39 */
40 struct evcount evcount_intr;
41
42 void evcount_init(void);
43
44 void
45 evcount_init(void)
46 {
47 TAILQ_INIT(&evcount_list);
48
49 evcount_attach(&evcount_intr, "intr", NULL, NULL);
50 }
51
52
53 void
54 evcount_attach(struct evcount *ec, const char *name, void *data,
55 struct evcount *parent)
56 {
57 static int nextid = 0;
58
59 if (nextid == 0) {
60 nextid++; /* start with 1 */
61 evcount_init();
62 }
63
64 memset(ec, 0, sizeof(*ec));
65 ec->ec_name = name;
66 ec->ec_parent = parent;
67 ec->ec_id = nextid++;
68 ec->ec_data = data;
69 TAILQ_INSERT_TAIL(&evcount_list, ec, next);
70 }
71
72 void
73 evcount_detach(struct evcount *ec)
74 {
75 TAILQ_REMOVE(&evcount_list, ec, next);
76 }
77
78 #ifndef SMALL_KERNEL
79
80 int
81 evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
82 void *newp, size_t newlen)
83 {
84 int error = 0, s, nintr, i;
85 struct evcount *ec;
86 u_int64_t count;
87
88 if (newp != NULL)
89 return (EPERM);
90
91 if (name[0] != KERN_INTRCNT_NUM) {
92 if (namelen != 2)
93 return (ENOTDIR);
94 if (name[1] < 0)
95 return (EINVAL);
96 i = name[1];
97 } else
98 i = -1;
99
100 nintr = 0;
101 TAILQ_FOREACH(ec, &evcount_list, next) {
102 if (ec->ec_parent != &evcount_intr)
103 continue;
104 if (nintr++ == i)
105 break;
106 }
107
108 switch (name[0]) {
109 case KERN_INTRCNT_NUM:
110 error = sysctl_rdint(oldp, oldlenp, NULL, nintr);
111 break;
112 case KERN_INTRCNT_CNT:
113 if (ec == NULL)
114 return (ENOENT);
115 s = splhigh();
116 count = ec->ec_count;
117 splx(s);
118 error = sysctl_rdquad(oldp, oldlenp, NULL, count);
119 break;
120 case KERN_INTRCNT_NAME:
121 if (ec == NULL)
122 return (ENOENT);
123 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name);
124 break;
125 case KERN_INTRCNT_VECTOR:
126 if (ec == NULL || ec->ec_data == NULL)
127 return (ENOENT);
128 error = sysctl_rdint(oldp, oldlenp, NULL,
129 *((int *)ec->ec_data));
130 break;
131 default:
132 error = EOPNOTSUPP;
133 break;
134 }
135
136 return (error);
137 }
138 #endif /* SMALL_KERNEL */