1 /* $OpenBSD: subr_evcount.c,v 1.5 2004/11/26 21:23:06 miod 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 static struct evcount *evcount_next_sync; 37 38 /* 39 * Standard evcount parents. 40 */ 41 struct evcount evcount_intr; 42 43 void evcount_timeout(void *); 44 void evcount_init(void); 45 46 void 47 evcount_init(void) 48 { 49 TAILQ_INIT(&evcount_list); 50 51 evcount_attach(&evcount_intr, "intr", NULL, NULL); 52 } 53 54 55 void 56 evcount_attach(ec, name, data, parent) 57 struct evcount *ec; 58 const char *name; 59 void *data; 60 struct evcount *parent; 61 { 62 static int nextid = 0; 63 64 if (nextid == 0) { 65 nextid++; /* start with 1 */ 66 evcount_init(); 67 } 68 69 memset(ec, 0, sizeof(*ec)); 70 ec->ec_name = name; 71 ec->ec_parent = parent; 72 ec->ec_id = nextid++; 73 ec->ec_data = data; 74 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 75 } 76 77 void 78 evcount_detach(ec) 79 struct evcount *ec; 80 { 81 if (evcount_next_sync == ec) 82 evcount_next_sync = TAILQ_NEXT(ec, next); 83 84 TAILQ_REMOVE(&evcount_list, ec, next); 85 } 86 87 int 88 evcount_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 89 int *name; 90 u_int namelen; 91 void *oldp; 92 size_t *oldlenp; 93 void *newp; 94 size_t newlen; 95 { 96 int error = 0, s, nintr, i; 97 struct evcount *ec; 98 u_int64_t count; 99 100 if (newp != NULL) 101 return (EPERM); 102 103 if (name[0] != KERN_INTRCNT_NUM) { 104 if (namelen != 2) 105 return (ENOTDIR); 106 if (name[1] < 0) 107 return (EINVAL); 108 i = name[1]; 109 } else 110 i = -1; 111 112 nintr = 0; 113 TAILQ_FOREACH(ec, &evcount_list, next) { 114 if (ec->ec_parent != &evcount_intr) 115 continue; 116 if (nintr++ == i) 117 break; 118 } 119 120 switch (name[0]) { 121 case KERN_INTRCNT_NUM: 122 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 123 break; 124 case KERN_INTRCNT_CNT: 125 if (ec == NULL) 126 return (ENOENT); 127 s = splhigh(); 128 count = ec->ec_count; 129 splx(s); 130 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 131 break; 132 case KERN_INTRCNT_NAME: 133 if (ec == NULL) 134 return (ENOENT); 135 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 136 break; 137 case KERN_INTRCNT_VECTOR: 138 if (ec == NULL || ec->ec_data == NULL) 139 return (ENOENT); 140 error = sysctl_rdint(oldp, oldlenp, NULL, 141 *((int *)ec->ec_data)); 142 break; 143 default: 144 error = EOPNOTSUPP; 145 break; 146 } 147 148 return (error); 149 } 150