1 /* $OpenBSD: subr_evcount.c,v 1.9 2010/04/20 22:05:43 tedu 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; 37 38 /* 39 * Standard evcount parents. 40 */ 41 struct evcount evcount_intr; 42 43 void evcount_init(void); 44 45 void 46 evcount_init(void) 47 { 48 TAILQ_INIT(&evcount_list); 49 50 evcount_attach(&evcount_intr, "intr", NULL, NULL); 51 } 52 53 54 void 55 evcount_attach(struct evcount *ec, const char *name, void *data, 56 struct evcount *parent) 57 { 58 static int nextid = 0; 59 60 if (nextid == 0) { 61 nextid++; /* start with 1 */ 62 evcount_init(); 63 } 64 65 memset(ec, 0, sizeof(*ec)); 66 ec->ec_name = name; 67 ec->ec_parent = parent; 68 ec->ec_id = nextid++; 69 ec->ec_data = data; 70 TAILQ_INSERT_TAIL(&evcount_list, ec, next); 71 } 72 73 void 74 evcount_detach(struct evcount *ec) 75 { 76 TAILQ_REMOVE(&evcount_list, ec, next); 77 } 78 79 #ifndef SMALL_KERNEL 80 81 int 82 evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 83 void *newp, size_t newlen) 84 { 85 int error = 0, s, nintr, i; 86 struct evcount *ec; 87 u_int64_t count; 88 89 if (newp != NULL) 90 return (EPERM); 91 92 if (name[0] != KERN_INTRCNT_NUM) { 93 if (namelen != 2) 94 return (ENOTDIR); 95 if (name[1] < 0) 96 return (EINVAL); 97 i = name[1]; 98 } else 99 i = -1; 100 101 nintr = 0; 102 TAILQ_FOREACH(ec, &evcount_list, next) { 103 if (ec->ec_parent != &evcount_intr) 104 continue; 105 if (nintr++ == i) 106 break; 107 } 108 109 switch (name[0]) { 110 case KERN_INTRCNT_NUM: 111 error = sysctl_rdint(oldp, oldlenp, NULL, nintr); 112 break; 113 case KERN_INTRCNT_CNT: 114 if (ec == NULL) 115 return (ENOENT); 116 s = splhigh(); 117 count = ec->ec_count; 118 splx(s); 119 error = sysctl_rdquad(oldp, oldlenp, NULL, count); 120 break; 121 case KERN_INTRCNT_NAME: 122 if (ec == NULL) 123 return (ENOENT); 124 error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name); 125 break; 126 case KERN_INTRCNT_VECTOR: 127 if (ec == NULL || ec->ec_data == NULL) 128 return (ENOENT); 129 error = sysctl_rdint(oldp, oldlenp, NULL, 130 *((int *)ec->ec_data)); 131 break; 132 default: 133 error = EOPNOTSUPP; 134 break; 135 } 136 137 return (error); 138 } 139 #endif /* SMALL_KERNEL */ 140