1 /* $NetBSD: subr_iostat.c,v 1.13 2007/02/09 21:55:31 ad 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 1.13 2007/02/09 21:55:31 ad 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 #include <sys/rwlock.h> 88 89 /* 90 * Function prototypes for sysctl nodes 91 */ 92 static int sysctl_hw_disknames(SYSCTLFN_PROTO); 93 static int sysctl_hw_iostatnames(SYSCTLFN_PROTO); 94 static int sysctl_hw_iostats(SYSCTLFN_PROTO); 95 96 static int 97 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp, 98 u_int namelen); 99 100 /* 101 * A global list of all drives attached to the system. May grow or 102 * shrink over time. 103 */ 104 struct iostatlist_head iostatlist = TAILQ_HEAD_INITIALIZER(iostatlist); 105 int iostat_count; /* number of drives in global drivelist */ 106 krwlock_t iostatlist_lock; 107 108 /* 109 * Initialise the iostat subsystem. 110 */ 111 void 112 iostat_init(void) 113 { 114 115 rw_init(&iostatlist_lock); 116 } 117 118 /* 119 * Searches the iostatlist for the iostat corresponding to the 120 * name provided. 121 */ 122 struct io_stats * 123 iostat_find(const char *name) 124 { 125 struct io_stats *iostatp; 126 127 KASSERT(name != NULL); 128 129 rw_enter(&iostatlist_lock, RW_READER); 130 TAILQ_FOREACH(iostatp, &iostatlist, io_link) { 131 if (strcmp(iostatp->io_name, name) == 0) { 132 break; 133 } 134 } 135 rw_exit(&iostatlist_lock); 136 137 return iostatp; 138 } 139 140 /* 141 * Allocate and initialise memory for the i/o statistics. 142 */ 143 struct io_stats * 144 iostat_alloc(int32_t type, void *parent, const char *name) 145 { 146 struct io_stats *stats; 147 148 stats = malloc(sizeof(struct io_stats), M_DEVBUF, M_WAITOK|M_ZERO); 149 if (stats == NULL) 150 panic("iostat_alloc: cannot allocate memory for stats buffer"); 151 152 stats->io_type = type; 153 stats->io_parent = parent; 154 (void)strlcpy(stats->io_name, name, sizeof(stats->io_name)); 155 156 /* 157 * Set the attached timestamp. 158 */ 159 getmicrouptime(&stats->io_attachtime); 160 161 /* 162 * Link into the drivelist. 163 */ 164 rw_enter(&iostatlist_lock, RW_WRITER); 165 TAILQ_INSERT_TAIL(&iostatlist, stats, io_link); 166 iostat_count++; 167 rw_exit(&iostatlist_lock); 168 169 return stats; 170 } 171 172 /* 173 * Remove i/o from stats collection. 174 */ 175 void 176 iostat_free(struct io_stats *stats) 177 { 178 179 /* 180 * Remove from the iostat list. 181 */ 182 if (iostat_count == 0) 183 panic("iostat_free: iostat_count == 0"); 184 rw_enter(&iostatlist_lock, RW_WRITER); 185 TAILQ_REMOVE(&iostatlist, stats, io_link); 186 iostat_count--; 187 rw_exit(&iostatlist_lock); 188 free(stats, M_DEVBUF); 189 } 190 191 /* 192 * Increment a iostat busy counter. If the counter is going from 193 * 0 to 1, set the timestamp. 194 */ 195 void 196 iostat_busy(struct io_stats *stats) 197 { 198 199 if (stats->io_busy++ == 0) 200 getmicrouptime(&stats->io_timestamp); 201 } 202 203 /* 204 * Decrement a iostat busy counter, increment the byte count, total busy 205 * time, and reset the timestamp. 206 */ 207 void 208 iostat_unbusy(struct io_stats *stats, long bcount, int read) 209 { 210 struct timeval dv_time, diff_time; 211 212 if (stats->io_busy-- == 0) { 213 printf("%s: busy < 0\n", stats->io_name); 214 panic("iostat_unbusy"); 215 } 216 217 getmicrouptime(&dv_time); 218 219 timersub(&dv_time, &stats->io_timestamp, &diff_time); 220 timeradd(&stats->io_time, &diff_time, &stats->io_time); 221 222 stats->io_timestamp = dv_time; 223 if (bcount > 0) { 224 if (read) { 225 stats->io_rbytes += bcount; 226 stats->io_rxfer++; 227 } else { 228 stats->io_wbytes += bcount; 229 stats->io_wxfer++; 230 } 231 } 232 } 233 234 /* 235 * Increment the seek counter. This does look almost redundant but it 236 * abstracts the stats gathering. 237 */ 238 void 239 iostat_seek(struct io_stats *stats) 240 { 241 242 stats->io_seek++; 243 } 244 245 static int 246 sysctl_hw_disknames(SYSCTLFN_ARGS) 247 { 248 249 return iostati_getnames(1, oldp, oldlenp, newp, namelen); 250 } 251 252 static int 253 sysctl_hw_iostatnames(SYSCTLFN_ARGS) 254 { 255 256 return iostati_getnames(0, oldp, oldlenp, newp, namelen); 257 } 258 259 static int 260 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp, 261 u_int namelen) 262 { 263 char bf[IOSTATNAMELEN + 1]; 264 char *where = oldp; 265 struct io_stats *stats; 266 size_t needed, left, slen; 267 int error, first; 268 269 if (newp != NULL) 270 return (EPERM); 271 if (namelen != 0) 272 return (EINVAL); 273 274 first = 1; 275 error = 0; 276 needed = 0; 277 left = *oldlenp; 278 279 rw_enter(&iostatlist_lock, RW_READER); 280 for (stats = TAILQ_FIRST(&iostatlist); stats != NULL; 281 stats = TAILQ_NEXT(stats, io_link)) { 282 if ((disk_only == 1) && (stats->io_type != IOSTAT_DISK)) 283 continue; 284 285 if (where == NULL) 286 needed += strlen(stats->io_name) + 1; 287 else { 288 memset(bf, 0, sizeof(bf)); 289 if (first) { 290 strncpy(bf, stats->io_name, sizeof(bf)); 291 first = 0; 292 } else { 293 bf[0] = ' '; 294 strncpy(bf + 1, stats->io_name, 295 sizeof(bf) - 1); 296 } 297 bf[IOSTATNAMELEN] = '\0'; 298 slen = strlen(bf); 299 if (left < slen + 1) 300 break; 301 /* +1 to copy out the trailing NUL byte */ 302 error = copyout(bf, where, slen + 1); 303 if (error) 304 break; 305 where += slen; 306 needed += slen; 307 left -= slen; 308 } 309 } 310 rw_exit(&iostatlist_lock); 311 *oldlenp = needed; 312 return (error); 313 } 314 315 static int 316 sysctl_hw_iostats(SYSCTLFN_ARGS) 317 { 318 struct io_sysctl sdrive; 319 struct io_stats *stats; 320 char *where = oldp; 321 size_t tocopy, left; 322 int error; 323 324 if (newp != NULL) 325 return (EPERM); 326 327 /* 328 * The original hw.diskstats call was broken and did not require 329 * the userland to pass in it's size of struct disk_sysctl. This 330 * was fixed after NetBSD 1.6 was released, and any applications 331 * that do not pass in the size are given an error only, unless 332 * we care about 1.6 compatibility. 333 */ 334 if (namelen == 0) 335 #ifdef COMPAT_16 336 tocopy = offsetof(struct io_sysctl, busy); 337 #else 338 return (EINVAL); 339 #endif 340 else 341 tocopy = name[0]; 342 343 if (where == NULL) { 344 *oldlenp = iostat_count * tocopy; 345 return (0); 346 } 347 348 error = 0; 349 left = *oldlenp; 350 memset(&sdrive, 0, sizeof(sdrive)); 351 *oldlenp = 0; 352 353 rw_enter(&iostatlist_lock, RW_READER); 354 TAILQ_FOREACH(stats, &iostatlist, io_link) { 355 if (left < tocopy) 356 break; 357 strncpy(sdrive.name, stats->io_name, sizeof(sdrive.name)); 358 sdrive.xfer = stats->io_rxfer + stats->io_wxfer; 359 sdrive.rxfer = stats->io_rxfer; 360 sdrive.wxfer = stats->io_wxfer; 361 sdrive.seek = stats->io_seek; 362 sdrive.bytes = stats->io_rbytes + stats->io_wbytes; 363 sdrive.rbytes = stats->io_rbytes; 364 sdrive.wbytes = stats->io_wbytes; 365 sdrive.attachtime_sec = stats->io_attachtime.tv_sec; 366 sdrive.attachtime_usec = stats->io_attachtime.tv_usec; 367 sdrive.timestamp_sec = stats->io_timestamp.tv_sec; 368 sdrive.timestamp_usec = stats->io_timestamp.tv_usec; 369 sdrive.time_sec = stats->io_time.tv_sec; 370 sdrive.time_usec = stats->io_time.tv_usec; 371 sdrive.busy = stats->io_busy; 372 373 error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive))); 374 if (error) 375 break; 376 where += tocopy; 377 *oldlenp += tocopy; 378 left -= tocopy; 379 } 380 rw_exit(&iostatlist_lock); 381 return (error); 382 } 383 384 SYSCTL_SETUP(sysctl_io_stats_setup, "sysctl i/o stats setup") 385 { 386 387 sysctl_createv(clog, 0, NULL, NULL, 388 CTLFLAG_PERMANENT, 389 CTLTYPE_STRING, "disknames", 390 SYSCTL_DESCR("List of disk drives present"), 391 sysctl_hw_disknames, 0, NULL, 0, 392 CTL_HW, HW_DISKNAMES, CTL_EOL); 393 sysctl_createv(clog, 0, NULL, NULL, 394 CTLFLAG_PERMANENT, 395 CTLTYPE_STRING, "iostatnames", 396 SYSCTL_DESCR("I/O stats are being collected for these" 397 " devices"), 398 sysctl_hw_iostatnames, 0, NULL, 0, 399 CTL_HW, HW_IOSTATNAMES, CTL_EOL); 400 sysctl_createv(clog, 0, NULL, NULL, 401 CTLFLAG_PERMANENT, 402 CTLTYPE_STRUCT, "iostats", 403 SYSCTL_DESCR("Statistics on device I/O operations"), 404 sysctl_hw_iostats, 0, NULL, 0, 405 CTL_HW, HW_IOSTATS, CTL_EOL); 406 } 407