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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License, Version 1.0 only
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6 * (the "License"). You may not use this file except in compliance
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7 * with the License.
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8 *
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9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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10 * or http://www.opensolaris.org/os/licensing.
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11 * See the License for the specific language governing permissions
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12 * and limitations under the License.
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13 *
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14 * When distributing Covered Code, include this CDDL HEADER in each
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15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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16 * If applicable, add the following below this CDDL HEADER, with the
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17 * fields enclosed by brackets "[]" replaced with your own identifying
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18 * information: Portions Copyright [yyyy] [name of copyright owner]
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19 *
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20 * CDDL HEADER END
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21 */
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22 /*
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23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
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24 * Use is subject to license terms.
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25 */
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26
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27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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28 /* All Rights Reserved */
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29
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30 #pragma ident "@(#)fssdispadmin.c 1.6 05/06/08 SMI"
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31
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32 #include <sys/types.h>
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33 #include <sys/param.h>
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34 #include <sys/fss.h>
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35 #include <sys/priocntl.h>
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36 #include <sys/fsspriocntl.h>
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37 #include <stdio.h>
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38 #include <stdlib.h>
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39 #include <string.h>
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40 #include <unistd.h>
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41 #include <errno.h>
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42 #include "dispadmin.h"
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43
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44 /*
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45 * This file contains the class specific code implementing the fair-share
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46 * scheduler dispadmin sub-command.
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47 */
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48
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49 #define BASENMSZ 16
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50
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51 extern char *basename();
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52 static void getadmin(), setadmin();
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53
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54 static char usage[] = "usage: dispadmin -l\n"
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55 "dispadmin -c FSS -g [-r res]\n"
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56 "dispadmin -c FSS -s infile\n";
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57
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58 static char basenm[BASENMSZ];
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59 static char cmdpath[256];
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60
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61 int
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62 main(int argc, char **argv)
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63 {
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64 int c;
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65 int lflag, gflag, rflag, sflag;
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66 ulong_t res;
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67 char *infile;
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68 char *endp;
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69
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70 (void) strcpy(cmdpath, argv[0]);
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71 (void) strcpy(basenm, basename(argv[0]));
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72 lflag = gflag = rflag = sflag = 0;
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73 while ((c = getopt(argc, argv, "lc:gr:s:")) != -1) {
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74 switch (c) {
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75
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76 case 'l':
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77 lflag++;
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78 break;
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79
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80 case 'c':
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81 if (strcmp(optarg, "FSS") != 0)
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82 fatalerr("error: %s executed for %s class, "
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83 "%s is actually sub-command for FSS "
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84 "class\n", cmdpath, optarg, cmdpath);
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85 break;
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86
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87 case 'g':
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88 gflag++;
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89 break;
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90
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91 case 'r':
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92 rflag++;
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93 errno = 0;
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94 res = strtoul(optarg, &endp, 10);
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95 if (res == 0 || errno != 0 || *endp != '\0')
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96 fatalerr("%s: Can't convert to requested "
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97 "resolution\n", basenm);
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98 break;
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99
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100 case 's':
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101 sflag++;
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102 infile = optarg;
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103 break;
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104
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105 case '?':
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106 fatalerr(usage);
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107
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108 default:
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109 break;
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110 }
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111 }
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112
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113 if (lflag) {
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114 if (gflag || rflag || sflag)
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115 fatalerr(usage);
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116
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117 (void) printf("FSS\t(Fair Share)\n");
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118 return (0);
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119
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120 } else if (gflag) {
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121 if (lflag || sflag)
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122 fatalerr(usage);
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123
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124 if (rflag == 0)
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125 res = 1000;
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126
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127 getadmin(res);
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128 return (0);
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129
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130 } else if (sflag) {
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131 if (lflag || gflag || rflag)
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132 fatalerr(usage);
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133
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134 setadmin(infile);
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135 return (0);
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136
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137 } else {
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138 fatalerr(usage);
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139 }
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140 return (1);
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141 }
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142
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143 /*
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144 * Retrieve the current settings from kernel, convert the time quantum
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145 * value to the resolution specified by res and print out the results.
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146 */
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147 static void
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148 getadmin(ulong_t res)
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149 {
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150 pcinfo_t pcinfo;
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151 pcadmin_t pcadmin;
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152 fssadmin_t fssadmin;
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153 hrtimer_t hrtime;
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154 long fss_quantum;
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155
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156 (void) strcpy(pcinfo.pc_clname, "FSS");
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157 if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
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158 fatalerr("%s: Can't get FSS class ID, priocntl system call "
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159 "failed (%s)\n", basenm, strerror(errno));
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160
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161 pcadmin.pc_cid = pcinfo.pc_cid;
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162 pcadmin.pc_cladmin = (char *)&fssadmin;
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163 fssadmin.fss_cmd = FSS_GETADMIN;
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164
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165 if (priocntl(0, 0, PC_ADMIN, (caddr_t)&pcadmin) == -1)
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166 fatalerr("%s: Can't get scheduler configuration, priocntl "
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167 "system call failed (%s)\n", basenm, strerror(errno));
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168
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169 hrtime.hrt_secs = 0;
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170 hrtime.hrt_rem = fssadmin.fss_quantum;
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171 hrtime.hrt_res = HZ;
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172 if (_hrtnewres(&hrtime, res, HRT_RNDUP) == -1)
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173 fatalerr("%s: Can't convert to requested resolution\n", basenm);
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174 if ((fss_quantum = hrtconvert(&hrtime)) == -1)
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175 fatalerr("%s: Can't express time quantum in "
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176 "requested resolution,\n"
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177 "try coarser resolution\n", basenm);
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178
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179 (void) printf("#\n# Fair Share Scheduler Configuration\n#\n");
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180 (void) printf("RES=%ld\n", res);
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181 (void) printf("#\n# Time Quantum\n#\n");
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182 (void) printf("QUANTUM=%ld\n", fss_quantum);
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183 }
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184
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185 /*
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186 * Read the scheduler settings from infile, convert the time quantum values
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187 * to HZ resolution, do a little sanity checking and overwrite kernel settings
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188 * with the values from the file.
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189 */
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190 static void
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191 setadmin(char *infile)
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192 {
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193 int i;
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194 pcinfo_t pcinfo;
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195 pcadmin_t pcadmin;
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196 fssadmin_t fssadmin;
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197 int line;
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198 ulong_t res;
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199 long fss_quantum;
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200 hrtimer_t hrtime;
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201 FILE *fp;
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202 char buf[512];
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203 char *endp;
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204 int nparams = 0;
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205
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206 (void) strcpy(pcinfo.pc_clname, "FSS");
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207 if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
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208 fatalerr("%s: Can't get FSS class ID, priocntl system call "
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209 "failed (%s)\n", basenm, strerror(errno));
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210
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211 if ((fp = fopen(infile, "r")) == NULL)
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212 fatalerr("%s: Can't open %s for input\n", basenm, infile);
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213
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214 for (line = 1; fgets(buf, sizeof (buf), fp) != NULL; line++) {
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215 char name[512], value[512];
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216 int len;
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217
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218 if (buf[0] == '#' || buf[0] == '\n')
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219 continue;
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220 /*
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221 * Look for "name=value", with optional whitespaces on either
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222 * side, terminated by a newline, and consuming the whole line.
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223 */
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224 /* LINTED - unbounded string specifier */
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225 if (sscanf(buf, " %[^=]=%s \n%n", name, value, &len) == 2 &&
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226 name[0] != '\0' && value[0] != '\0' && len == strlen(buf)) {
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227
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228 if (strcmp(name, "RES") == 0) {
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229 errno = 0;
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230 i = (int)strtol(value, &endp, 10);
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231 if (errno != 0 || endp == value ||
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232 i < 0 || *endp != '\0')
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233 fatalerr("%s, line %d: illegal "
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234 "resolution value\n", infile, line);
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235 else
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236 res = i;
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237 nparams++;
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238 } else if (strcmp(name, "QUANTUM") == 0) {
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239 errno = 0;
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240 i = (int)strtol(value, &endp, 10);
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241 if (errno != 0 || endp == value ||
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242 i < 0 || *endp != '\0')
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243 fatalerr("%s, line %d: illegal time "
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244 "quantum value\n", infile, line);
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245 else
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246 fss_quantum = i;
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247 nparams++;
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248 } else {
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249 fatalerr("%s, line %d: invalid token\n",
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250 infile, line);
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251 }
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252 } else {
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253 fatalerr("%s, line %d: syntax error\n", infile, line);
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254 }
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255 }
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256 if (line == 1 || nparams < 2)
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257 fatalerr("cannot read settings from %s\n", infile);
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258 if (res != HZ) {
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259 hrtime.hrt_secs = 0;
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260 hrtime.hrt_rem = fss_quantum;
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261 hrtime.hrt_res = res;
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262 if (_hrtnewres(&hrtime, HZ, HRT_RNDUP) == -1)
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263 fatalerr("%s: Can't convert specified "
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264 "resolution to ticks\n", basenm);
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265 if ((fssadmin.fss_quantum = hrtconvert(&hrtime)) == -1)
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266 fatalerr("%s, line %d: time quantum value out of "
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267 "valid range\n", infile, line);
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268 } else {
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269 fssadmin.fss_quantum = (short)fss_quantum;
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270 }
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271
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272 pcadmin.pc_cid = pcinfo.pc_cid;
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273 pcadmin.pc_cladmin = (char *)&fssadmin;
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274 fssadmin.fss_cmd = FSS_SETADMIN;
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275
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276 if (priocntl(0, 0, PC_ADMIN, (caddr_t)&pcadmin) == -1)
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277 fatalerr("%s: Can't set scheduler parameters, priocntl "
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278 "system call failed (%s)\n", basenm, strerror(errno));
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279 }
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