1 /* $OpenBSD: subr_evcount.c,v 1.10 2010/09/20 06:33:46 matthew 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/proc.h> 34 #include <sys/sysctl.h> 35 36 static TAILQ_HEAD(,evcount) evcount_list = TAILQ_HEAD_INITIALIZER(evcount_list); 37 38 void 39 evcount_attach(struct evcount *ec, const char *name, void *data) 40 { 41 static int nextid = 0; 42 43 memset(ec, 0, sizeof(*ec)); 44 ec->ec_name = name; 45 ec->ec_id = ++nextid; 46 ec->ec_data = data; 47 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 48 } 49 50 void 51 evcount_detach(struct evcount *ec) 52 { 53 TAILQ_REMOVE(&evcount_list, ec, next); 54 } 55 56 #ifndef SMALL_KERNEL 57 58 int 59 evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 60 void *newp, size_t newlen) 61 { 62 int error = 0, s, nintr, i; 63 struct evcount *ec; 64 u_int64_t count; 65 66 if (newp != NULL) 67 return (EPERM); 68 69 if (name[0] != KERN_INTRCNT_NUM) { 70 if (namelen != 2) 71 return (ENOTDIR); 72 if (name[1] < 0) 73 return (EINVAL); 74 i = name[1]; 75 } else 76 i = -1; 77 78 nintr = 0; 79 TAILQ_FOREACH(ec, &evcount_list, next) { 80 if (nintr++ == i) 81 break; 82 } 83 84 switch (name[0]) { 85 case KERN_INTRCNT_NUM: 86 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 87 break; 88 case KERN_INTRCNT_CNT: 89 if (ec == NULL) 90 return (ENOENT); 91 s = splhigh(); 92 count = ec->ec_count; 93 splx(s); 94 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 95 break; 96 case KERN_INTRCNT_NAME: 97 if (ec == NULL) 98 return (ENOENT); 99 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 100 break; 101 case KERN_INTRCNT_VECTOR: 102 if (ec == NULL || ec->ec_data == NULL) 103 return (ENOENT); 104 error = sysctl_rdint(oldp, oldlenp, NULL, 105 *((int *)ec->ec_data)); 106 break; 107 default: 108 error = EOPNOTSUPP; 109 break; 110 } 111 112 return (error); 113 } 114 #endif /* SMALL_KERNEL */ 115