1 /* $NetBSD: intrctl_io.c,v 1.1 2015/08/17 06:42:46 knakahara Exp $ */ 2 3 /* 4 * Copyright (c) 2015 Internet Initiative Japan Inc. 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 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __RCSID("$NetBSD: intrctl_io.c,v 1.1 2015/08/17 06:42:46 knakahara Exp $"); 31 32 #include <sys/sysctl.h> 33 #include <sys/intrio.h> 34 35 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 39 #include "intrctl_io.h" 40 41 /* 42 * To support increasing the number of interrupts (devices are dynamically 43 * attached), retry sysctl(3) "retry" times. 44 */ 45 void * 46 intrctl_io_alloc(int retry) 47 { 48 size_t buf_size; 49 int i, error; 50 void *buf; 51 52 error = sysctlbyname("kern.intr.list", NULL, &buf_size, NULL, 0); 53 if (error < 0) { 54 return NULL; 55 } 56 57 buf = malloc(buf_size); 58 if (buf == NULL) { 59 return NULL; 60 } 61 62 for (i = 0; i < retry; i++) { 63 error = sysctlbyname("kern.intr.list", buf, &buf_size, NULL, 0); 64 if (error >= 0) 65 return buf; 66 else if (error == -ENOMEM) { 67 void *temp; 68 69 temp = realloc(buf, buf_size); 70 if (temp == NULL) { 71 free(buf); 72 return NULL; 73 } 74 buf = temp; 75 } else { 76 free(buf); 77 return NULL; 78 } 79 } 80 return NULL; 81 } 82 83 void 84 intrctl_io_free(void *handle) 85 { 86 87 free(handle); 88 } 89 90 int 91 intrctl_io_ncpus(void *handle) 92 { 93 struct intrio_list *list = handle; 94 95 return list->il_ncpus; 96 } 97 98 int 99 intrctl_io_nintrs(void *handle) 100 { 101 struct intrio_list *list = handle; 102 103 return list->il_nintrs; 104 } 105 106 struct intrio_list_line * 107 intrctl_io_firstline(void *handle) 108 { 109 struct intrio_list *list = handle; 110 111 return (struct intrio_list_line *)((char *)list + list->il_lineoffset); 112 } 113 114 struct intrio_list_line * 115 intrctl_io_nextline(void *handle, struct intrio_list_line *cur) 116 { 117 struct intrio_list *list; 118 struct intrio_list_line *next; 119 size_t line_size; 120 char *buf_end; 121 122 list = handle; 123 buf_end = (char *)list + list->il_bufsize; 124 125 line_size = list->il_linesize; 126 next = (struct intrio_list_line *)((char *)cur + line_size); 127 if ((char *)next >= buf_end) 128 return NULL; 129 130 return next; 131 } 132