1/* $NetBSD: intrctl_io.c,v 1.5 2019/09/23 09:17:19 mrg 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 1.5 2019/09/23 09:17:19 mrg 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 */ 45void * 46intrctl_io_alloc(int retry) 47{ 48 size_t buf_size; 49 int i, error; 50 void *buf = NULL; 51 52 error = sysctlbyname("kern.intr.list", NULL, &buf_size, NULL, 0); 53 if (error < 0) { 54 goto error; 55 } 56 57 buf = malloc(buf_size); 58 if (buf == NULL) { 59 goto error; 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 (errno == ENOMEM) { 67 void *temp; 68 69 temp = realloc(buf, buf_size); 70 if (temp == NULL) { 71 goto error; 72 } 73 buf = temp; 74 } else { 75 goto error; 76 } 77 } 78error: 79 free(buf); 80 return NULL; 81} 82 83void 84intrctl_io_free(void *handle) 85{ 86 87 free(handle); 88} 89 90int 91intrctl_io_ncpus(void *handle) 92{ 93 struct intrio_list *list = handle; 94 95 return list->il_ncpus; 96} 97 98int 99intrctl_io_nintrs(void *handle) 100{ 101 struct intrio_list *list = handle; 102 103 return list->il_nintrs; 104} 105 106struct intrio_list_line * 107intrctl_io_firstline(void *handle) 108{ 109 struct intrio_list *list = handle; 110 struct intrio_list_line *next; 111 char *buf_end; 112 113 buf_end = (char *)list + list->il_bufsize; 114 next = (struct intrio_list_line *)((char *)list + list->il_lineoffset); 115 if ((char *)next >= buf_end) 116 return NULL; 117 118 return next; 119} 120 121struct intrio_list_line * 122intrctl_io_nextline(void *handle, struct intrio_list_line *cur) 123{ 124 struct intrio_list *list; 125 struct intrio_list_line *next; 126 size_t line_size; 127 char *buf_end; 128 129 list = handle; 130 buf_end = (char *)list + list->il_bufsize; 131 132 line_size = list->il_linesize; 133 next = (struct intrio_list_line *)((char *)cur + line_size); 134 if ((char *)next >= buf_end) 135 return NULL; 136 137 return next; 138} 139