1 /* $OpenBSD: subr_evcount.c,v 1.7 2005/12/09 09:09:52 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; 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(struct evcount *ec, const char *name, void *data, 57 struct evcount *parent) 58 { 59 static int nextid = 0; 60 61 if (nextid == 0) { 62 nextid++; /* start with 1 */ 63 evcount_init(); 64 } 65 66 memset(ec, 0, sizeof(*ec)); 67 ec->ec_name = name; 68 ec->ec_parent = parent; 69 ec->ec_id = nextid++; 70 ec->ec_data = data; 71 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 72 } 73 74 void 75 evcount_detach(struct evcount *ec) 76 { 77 if (evcount_next_sync == ec) 78 evcount_next_sync = TAILQ_NEXT(ec, next); 79 80 TAILQ_REMOVE(&evcount_list, ec, next); 81 } 82 83 #ifndef SMALL_KERNEL 84 85 int 86 evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 87 void *newp, size_t newlen) 88 { 89 int error = 0, s, nintr, i; 90 struct evcount *ec; 91 u_int64_t count; 92 93 if (newp != NULL) 94 return (EPERM); 95 96 if (name[0] != KERN_INTRCNT_NUM) { 97 if (namelen != 2) 98 return (ENOTDIR); 99 if (name[1] < 0) 100 return (EINVAL); 101 i = name[1]; 102 } else 103 i = -1; 104 105 nintr = 0; 106 TAILQ_FOREACH(ec, &evcount_list, next) { 107 if (ec->ec_parent != &evcount_intr) 108 continue; 109 if (nintr++ == i) 110 break; 111 } 112 113 switch (name[0]) { 114 case KERN_INTRCNT_NUM: 115 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 116 break; 117 case KERN_INTRCNT_CNT: 118 if (ec == NULL) 119 return (ENOENT); 120 s = splhigh(); 121 count = ec->ec_count; 122 splx(s); 123 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 124 break; 125 case KERN_INTRCNT_NAME: 126 if (ec == NULL) 127 return (ENOENT); 128 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 129 break; 130 case KERN_INTRCNT_VECTOR: 131 if (ec == NULL || ec->ec_data == NULL) 132 return (ENOENT); 133 error = sysctl_rdint(oldp, oldlenp, NULL, 134 *((int *)ec->ec_data)); 135 break; 136 default: 137 error = EOPNOTSUPP; 138 break; 139 } 140 141 return (error); 142 } 143 #endif /* SMALL_KERNEL */ 144