1 /* $OpenBSD: subr_evcount.c,v 1.11 2014/09/14 14:17:25 jsg 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 = TAILQ_HEAD_INITIALIZER(evcount_list); 36 37 void 38 evcount_attach(struct evcount *ec, const char *name, void *data) 39 { 40 static int nextid = 0; 41 42 memset(ec, 0, sizeof(*ec)); 43 ec->ec_name = name; 44 ec->ec_id = ++nextid; 45 ec->ec_data = data; 46 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 47 } 48 49 void 50 evcount_detach(struct evcount *ec) 51 { 52 TAILQ_REMOVE(&evcount_list, ec, next); 53 } 54 55 #ifndef SMALL_KERNEL 56 57 int 58 evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 59 void *newp, size_t newlen) 60 { 61 int error = 0, s, nintr, i; 62 struct evcount *ec; 63 u_int64_t count; 64 65 if (newp != NULL) 66 return (EPERM); 67 68 if (name[0] != KERN_INTRCNT_NUM) { 69 if (namelen != 2) 70 return (ENOTDIR); 71 if (name[1] < 0) 72 return (EINVAL); 73 i = name[1]; 74 } else 75 i = -1; 76 77 nintr = 0; 78 TAILQ_FOREACH(ec, &evcount_list, next) { 79 if (nintr++ == i) 80 break; 81 } 82 83 switch (name[0]) { 84 case KERN_INTRCNT_NUM: 85 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 86 break; 87 case KERN_INTRCNT_CNT: 88 if (ec == NULL) 89 return (ENOENT); 90 s = splhigh(); 91 count = ec->ec_count; 92 splx(s); 93 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 94 break; 95 case KERN_INTRCNT_NAME: 96 if (ec == NULL) 97 return (ENOENT); 98 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 99 break; 100 case KERN_INTRCNT_VECTOR: 101 if (ec == NULL || ec->ec_data == NULL) 102 return (ENOENT); 103 error = sysctl_rdint(oldp, oldlenp, NULL, 104 *((int *)ec->ec_data)); 105 break; 106 default: 107 error = EOPNOTSUPP; 108 break; 109 } 110 111 return (error); 112 } 113 #endif /* SMALL_KERNEL */ 114