1 /* $NetBSD: subr_iostat.c,v 1.9 2006/04/21 13:58:10 yamt Exp $ */ 2 /* NetBSD: subr_disk.c,v 1.69 2005/05/29 22:24:15 christos Exp */ 3 4 /*- 5 * Copyright (c) 1996, 1997, 1999, 2000 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 10 * NASA Ames Research Center. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41 /* 42 * Copyright (c) 1982, 1986, 1988, 1993 43 * The Regents of the University of California. All rights reserved. 44 * (c) UNIX System Laboratories, Inc. 45 * All or some portions of this file are derived from material licensed 46 * to the University of California by American Telephone and Telegraph 47 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 48 * the permission of UNIX System Laboratories, Inc. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice, this list of conditions and the following disclaimer. 55 * 2. Redistributions in binary form must reproduce the above copyright 56 * notice, this list of conditions and the following disclaimer in the 57 * documentation and/or other materials provided with the distribution. 58 * 3. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94 75 */ 76 77 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: subr_iostat.c,v 1.9 2006/04/21 13:58:10 yamt Exp $"); 79 80 #include "opt_compat_netbsd.h" 81 82 #include <sys/param.h> 83 #include <sys/kernel.h> 84 #include <sys/malloc.h> 85 #include <sys/iostat.h> 86 #include <sys/sysctl.h> 87 88 /* 89 * Function prototypes for sysctl nodes 90 */ 91 static int sysctl_hw_disknames(SYSCTLFN_PROTO); 92 static int sysctl_hw_iostatnames(SYSCTLFN_PROTO); 93 static int sysctl_hw_iostats(SYSCTLFN_PROTO); 94 95 static int 96 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp, 97 u_int namelen); 98 99 /* 100 * A global list of all drives attached to the system. May grow or 101 * shrink over time. 102 */ 103 struct iostatlist_head iostatlist = TAILQ_HEAD_INITIALIZER(iostatlist); 104 int iostat_count; /* number of drives in global drivelist */ 105 struct simplelock iostatlist_slock = SIMPLELOCK_INITIALIZER; 106 107 /* 108 * Searches the iostatlist for the iostat corresponding to the 109 * name provided. 110 */ 111 struct io_stats * 112 iostat_find(const char *name) 113 { 114 struct io_stats *iostatp; 115 116 KASSERT(name != NULL); 117 118 simple_lock(&iostatlist_slock); 119 TAILQ_FOREACH(iostatp, &iostatlist, io_link) { 120 if (strcmp(iostatp->io_name, name) == 0) { 121 break; 122 } 123 } 124 simple_unlock(&iostatlist_slock); 125 126 return iostatp; 127 } 128 129 /* 130 * Allocate and initialise memory for the i/o statistics. 131 */ 132 struct io_stats * 133 iostat_alloc(int32_t type) 134 { 135 int s; 136 struct io_stats *stats; 137 138 stats = malloc(sizeof(struct io_stats), M_DEVBUF, M_WAITOK|M_ZERO); 139 if (stats == NULL) 140 panic("iostat_alloc: cannot allocate memory for stats buffer"); 141 142 stats->io_type = type; 143 144 /* 145 * Set the attached timestamp. 146 */ 147 s = splclock(); 148 stats->io_attachtime = mono_time; 149 splx(s); 150 151 /* 152 * Link into the drivelist. 153 */ 154 simple_lock(&iostatlist_slock); 155 TAILQ_INSERT_TAIL(&iostatlist, stats, io_link); 156 iostat_count++; 157 simple_unlock(&iostatlist_slock); 158 159 return stats; 160 } 161 162 /* 163 * Remove i/o from stats collection. 164 */ 165 void 166 iostat_free(struct io_stats *stats) 167 { 168 169 /* 170 * Remove from the iostat list. 171 */ 172 if (iostat_count == 0) 173 panic("iostat_free: iostat_count == 0"); 174 simple_lock(&iostatlist_slock); 175 TAILQ_REMOVE(&iostatlist, stats, io_link); 176 iostat_count--; 177 simple_unlock(&iostatlist_slock); 178 free(stats, M_DEVBUF); 179 } 180 181 /* 182 * Increment a iostat busy counter. If the counter is going from 183 * 0 to 1, set the timestamp. 184 */ 185 void 186 iostat_busy(struct io_stats *stats) 187 { 188 int s; 189 190 /* 191 * XXX We'd like to use something as accurate as microtime(), 192 * but that doesn't depend on the system TOD clock. 193 */ 194 if (stats->io_busy++ == 0) { 195 s = splclock(); 196 stats->io_timestamp = mono_time; 197 splx(s); 198 } 199 } 200 201 /* 202 * Decrement a iostat busy counter, increment the byte count, total busy 203 * time, and reset the timestamp. 204 */ 205 void 206 iostat_unbusy(struct io_stats *stats, long bcount, int read) 207 { 208 int s; 209 struct timeval dv_time, diff_time; 210 211 if (stats->io_busy-- == 0) { 212 printf("%s: busy < 0\n", stats->io_name); 213 panic("iostat_unbusy"); 214 } 215 216 s = splclock(); 217 dv_time = mono_time; 218 splx(s); 219 220 timersub(&dv_time, &stats->io_timestamp, &diff_time); 221 timeradd(&stats->io_time, &diff_time, &stats->io_time); 222 223 stats->io_timestamp = dv_time; 224 if (bcount > 0) { 225 if (read) { 226 stats->io_rbytes += bcount; 227 stats->io_rxfer++; 228 } else { 229 stats->io_wbytes += bcount; 230 stats->io_wxfer++; 231 } 232 } 233 } 234 235 /* 236 * Increment the seek counter. This does look almost redundant but it 237 * abstracts the stats gathering. 238 */ 239 void 240 iostat_seek(struct io_stats *stats) 241 { 242 243 stats->io_seek++; 244 } 245 246 static int 247 sysctl_hw_disknames(SYSCTLFN_ARGS) 248 { 249 250 return iostati_getnames(1, oldp, oldlenp, newp, namelen); 251 } 252 253 static int 254 sysctl_hw_iostatnames(SYSCTLFN_ARGS) 255 { 256 257 return iostati_getnames(0, oldp, oldlenp, newp, namelen); 258 } 259 260 static int 261 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp, 262 u_int namelen) 263 { 264 char bf[IOSTATNAMELEN + 1]; 265 char *where = oldp; 266 struct io_stats *stats; 267 size_t needed, left, slen; 268 int error, first; 269 270 if (newp != NULL) 271 return (EPERM); 272 if (namelen != 0) 273 return (EINVAL); 274 275 first = 1; 276 error = 0; 277 needed = 0; 278 left = *oldlenp; 279 280 simple_lock(&iostatlist_slock); 281 for (stats = TAILQ_FIRST(&iostatlist); stats != NULL; 282 stats = TAILQ_NEXT(stats, io_link)) { 283 if ((disk_only == 1) && (stats->io_type != IOSTAT_DISK)) 284 continue; 285 286 if (where == NULL) 287 needed += strlen(stats->io_name) + 1; 288 else { 289 memset(bf, 0, sizeof(bf)); 290 if (first) { 291 strncpy(bf, stats->io_name, sizeof(bf)); 292 first = 0; 293 } else { 294 bf[0] = ' '; 295 strncpy(bf + 1, stats->io_name, 296 sizeof(bf) - 1); 297 } 298 bf[IOSTATNAMELEN] = '\0'; 299 slen = strlen(bf); 300 if (left < slen + 1) 301 break; 302 /* +1 to copy out the trailing NUL byte */ 303 error = copyout(bf, where, slen + 1); 304 if (error) 305 break; 306 where += slen; 307 needed += slen; 308 left -= slen; 309 } 310 } 311 simple_unlock(&iostatlist_slock); 312 *oldlenp = needed; 313 return (error); 314 } 315 316 static int 317 sysctl_hw_iostats(SYSCTLFN_ARGS) 318 { 319 struct io_sysctl sdrive; 320 struct io_stats *stats; 321 char *where = oldp; 322 size_t tocopy, left; 323 int error; 324 325 if (newp != NULL) 326 return (EPERM); 327 328 /* 329 * The original hw.diskstats call was broken and did not require 330 * the userland to pass in it's size of struct disk_sysctl. This 331 * was fixed after NetBSD 1.6 was released, and any applications 332 * that do not pass in the size are given an error only, unless 333 * we care about 1.6 compatibility. 334 */ 335 if (namelen == 0) 336 #ifdef COMPAT_16 337 tocopy = offsetof(struct io_sysctl, busy); 338 #else 339 return (EINVAL); 340 #endif 341 else 342 tocopy = name[0]; 343 344 if (where == NULL) { 345 *oldlenp = iostat_count * tocopy; 346 return (0); 347 } 348 349 error = 0; 350 left = *oldlenp; 351 memset(&sdrive, 0, sizeof(sdrive)); 352 *oldlenp = 0; 353 354 simple_lock(&iostatlist_slock); 355 TAILQ_FOREACH(stats, &iostatlist, io_link) { 356 if (left < tocopy) 357 break; 358 strncpy(sdrive.name, stats->io_name, sizeof(sdrive.name)); 359 sdrive.xfer = stats->io_rxfer + stats->io_wxfer; 360 sdrive.rxfer = stats->io_rxfer; 361 sdrive.wxfer = stats->io_wxfer; 362 sdrive.seek = stats->io_seek; 363 sdrive.bytes = stats->io_rbytes + stats->io_wbytes; 364 sdrive.rbytes = stats->io_rbytes; 365 sdrive.wbytes = stats->io_wbytes; 366 sdrive.attachtime_sec = stats->io_attachtime.tv_sec; 367 sdrive.attachtime_usec = stats->io_attachtime.tv_usec; 368 sdrive.timestamp_sec = stats->io_timestamp.tv_sec; 369 sdrive.timestamp_usec = stats->io_timestamp.tv_usec; 370 sdrive.time_sec = stats->io_time.tv_sec; 371 sdrive.time_usec = stats->io_time.tv_usec; 372 sdrive.busy = stats->io_busy; 373 374 error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive))); 375 if (error) 376 break; 377 where += tocopy; 378 *oldlenp += tocopy; 379 left -= tocopy; 380 } 381 simple_unlock(&iostatlist_slock); 382 return (error); 383 } 384 385 SYSCTL_SETUP(sysctl_io_stats_setup, "sysctl i/o stats setup") 386 { 387 388 sysctl_createv(clog, 0, NULL, NULL, 389 CTLFLAG_PERMANENT, 390 CTLTYPE_STRING, "disknames", 391 SYSCTL_DESCR("List of disk drives present"), 392 sysctl_hw_disknames, 0, NULL, 0, 393 CTL_HW, HW_DISKNAMES, CTL_EOL); 394 sysctl_createv(clog, 0, NULL, NULL, 395 CTLFLAG_PERMANENT, 396 CTLTYPE_STRING, "iostatnames", 397 SYSCTL_DESCR("I/O stats are being collected for these" 398 " devices"), 399 sysctl_hw_iostatnames, 0, NULL, 0, 400 CTL_HW, HW_IOSTATNAMES, CTL_EOL); 401 sysctl_createv(clog, 0, NULL, NULL, 402 CTLFLAG_PERMANENT, 403 CTLTYPE_STRUCT, "iostats", 404 SYSCTL_DESCR("Statistics on device I/O operations"), 405 sysctl_hw_iostats, 0, NULL, 0, 406 CTL_HW, HW_IOSTATS, CTL_EOL); 407 } 408