Annotation of sys/kern/subr_evcount.c, Revision 1.1.1.1
1.1 nbrk 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 */
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