1 /* $NetBSD: subr_iostat.c,v 1.11 2006/08/23 17:19:32 christos 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 1.11 2006/08/23 17:19:32 christos 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, void *parent, const char *name) 134 { 135 struct io_stats *stats; 136 137 stats = malloc(sizeof(struct io_stats), M_DEVBUF, M_WAITOK|M_ZERO); 138 if (stats == NULL) 139 panic("iostat_alloc: cannot allocate memory for stats buffer"); 140 141 stats->io_type = type; 142 stats->io_parent = parent; 143 (void)strlcpy(stats->io_name, name, sizeof(stats->io_name)); 144 145 /* 146 * Set the attached timestamp. 147 */ 148 getmicrouptime(&stats->io_attachtime); 149 150 /* 151 * Link into the drivelist. 152 */ 153 simple_lock(&iostatlist_slock); 154 TAILQ_INSERT_TAIL(&iostatlist, stats, io_link); 155 iostat_count++; 156 simple_unlock(&iostatlist_slock); 157 158 return stats; 159 } 160 161 /* 162 * Remove i/o from stats collection. 163 */ 164 void 165 iostat_free(struct io_stats *stats) 166 { 167 168 /* 169 * Remove from the iostat list. 170 */ 171 if (iostat_count == 0) 172 panic("iostat_free: iostat_count == 0"); 173 simple_lock(&iostatlist_slock); 174 TAILQ_REMOVE(&iostatlist, stats, io_link); 175 iostat_count--; 176 simple_unlock(&iostatlist_slock); 177 free(stats, M_DEVBUF); 178 } 179 180 /* 181 * Increment a iostat busy counter. If the counter is going from 182 * 0 to 1, set the timestamp. 183 */ 184 void 185 iostat_busy(struct io_stats *stats) 186 { 187 188 if (stats->io_busy++ == 0) 189 getmicrouptime(&stats->io_timestamp); 190 } 191 192 /* 193 * Decrement a iostat busy counter, increment the byte count, total busy 194 * time, and reset the timestamp. 195 */ 196 void 197 iostat_unbusy(struct io_stats *stats, long bcount, int read) 198 { 199 struct timeval dv_time, diff_time; 200 201 if (stats->io_busy-- == 0) { 202 printf("%s: busy < 0\n", stats->io_name); 203 panic("iostat_unbusy"); 204 } 205 206 getmicrouptime(&dv_time); 207 208 timersub(&dv_time, &stats->io_timestamp, &diff_time); 209 timeradd(&stats->io_time, &diff_time, &stats->io_time); 210 211 stats->io_timestamp = dv_time; 212 if (bcount > 0) { 213 if (read) { 214 stats->io_rbytes += bcount; 215 stats->io_rxfer++; 216 } else { 217 stats->io_wbytes += bcount; 218 stats->io_wxfer++; 219 } 220 } 221 } 222 223 /* 224 * Increment the seek counter. This does look almost redundant but it 225 * abstracts the stats gathering. 226 */ 227 void 228 iostat_seek(struct io_stats *stats) 229 { 230 231 stats->io_seek++; 232 } 233 234 static int 235 sysctl_hw_disknames(SYSCTLFN_ARGS) 236 { 237 238 return iostati_getnames(1, oldp, oldlenp, newp, namelen); 239 } 240 241 static int 242 sysctl_hw_iostatnames(SYSCTLFN_ARGS) 243 { 244 245 return iostati_getnames(0, oldp, oldlenp, newp, namelen); 246 } 247 248 static int 249 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp, 250 u_int namelen) 251 { 252 char bf[IOSTATNAMELEN + 1]; 253 char *where = oldp; 254 struct io_stats *stats; 255 size_t needed, left, slen; 256 int error, first; 257 258 if (newp != NULL) 259 return (EPERM); 260 if (namelen != 0) 261 return (EINVAL); 262 263 first = 1; 264 error = 0; 265 needed = 0; 266 left = *oldlenp; 267 268 simple_lock(&iostatlist_slock); 269 for (stats = TAILQ_FIRST(&iostatlist); stats != NULL; 270 stats = TAILQ_NEXT(stats, io_link)) { 271 if ((disk_only == 1) && (stats->io_type != IOSTAT_DISK)) 272 continue; 273 274 if (where == NULL) 275 needed += strlen(stats->io_name) + 1; 276 else { 277 memset(bf, 0, sizeof(bf)); 278 if (first) { 279 strncpy(bf, stats->io_name, sizeof(bf)); 280 first = 0; 281 } else { 282 bf[0] = ' '; 283 strncpy(bf + 1, stats->io_name, 284 sizeof(bf) - 1); 285 } 286 bf[IOSTATNAMELEN] = '\0'; 287 slen = strlen(bf); 288 if (left < slen + 1) 289 break; 290 /* +1 to copy out the trailing NUL byte */ 291 error = copyout(bf, where, slen + 1); 292 if (error) 293 break; 294 where += slen; 295 needed += slen; 296 left -= slen; 297 } 298 } 299 simple_unlock(&iostatlist_slock); 300 *oldlenp = needed; 301 return (error); 302 } 303 304 static int 305 sysctl_hw_iostats(SYSCTLFN_ARGS) 306 { 307 struct io_sysctl sdrive; 308 struct io_stats *stats; 309 char *where = oldp; 310 size_t tocopy, left; 311 int error; 312 313 if (newp != NULL) 314 return (EPERM); 315 316 /* 317 * The original hw.diskstats call was broken and did not require 318 * the userland to pass in it's size of struct disk_sysctl. This 319 * was fixed after NetBSD 1.6 was released, and any applications 320 * that do not pass in the size are given an error only, unless 321 * we care about 1.6 compatibility. 322 */ 323 if (namelen == 0) 324 #ifdef COMPAT_16 325 tocopy = offsetof(struct io_sysctl, busy); 326 #else 327 return (EINVAL); 328 #endif 329 else 330 tocopy = name[0]; 331 332 if (where == NULL) { 333 *oldlenp = iostat_count * tocopy; 334 return (0); 335 } 336 337 error = 0; 338 left = *oldlenp; 339 memset(&sdrive, 0, sizeof(sdrive)); 340 *oldlenp = 0; 341 342 simple_lock(&iostatlist_slock); 343 TAILQ_FOREACH(stats, &iostatlist, io_link) { 344 if (left < tocopy) 345 break; 346 strncpy(sdrive.name, stats->io_name, sizeof(sdrive.name)); 347 sdrive.xfer = stats->io_rxfer + stats->io_wxfer; 348 sdrive.rxfer = stats->io_rxfer; 349 sdrive.wxfer = stats->io_wxfer; 350 sdrive.seek = stats->io_seek; 351 sdrive.bytes = stats->io_rbytes + stats->io_wbytes; 352 sdrive.rbytes = stats->io_rbytes; 353 sdrive.wbytes = stats->io_wbytes; 354 sdrive.attachtime_sec = stats->io_attachtime.tv_sec; 355 sdrive.attachtime_usec = stats->io_attachtime.tv_usec; 356 sdrive.timestamp_sec = stats->io_timestamp.tv_sec; 357 sdrive.timestamp_usec = stats->io_timestamp.tv_usec; 358 sdrive.time_sec = stats->io_time.tv_sec; 359 sdrive.time_usec = stats->io_time.tv_usec; 360 sdrive.busy = stats->io_busy; 361 362 error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive))); 363 if (error) 364 break; 365 where += tocopy; 366 *oldlenp += tocopy; 367 left -= tocopy; 368 } 369 simple_unlock(&iostatlist_slock); 370 return (error); 371 } 372 373 SYSCTL_SETUP(sysctl_io_stats_setup, "sysctl i/o stats setup") 374 { 375 376 sysctl_createv(clog, 0, NULL, NULL, 377 CTLFLAG_PERMANENT, 378 CTLTYPE_STRING, "disknames", 379 SYSCTL_DESCR("List of disk drives present"), 380 sysctl_hw_disknames, 0, NULL, 0, 381 CTL_HW, HW_DISKNAMES, CTL_EOL); 382 sysctl_createv(clog, 0, NULL, NULL, 383 CTLFLAG_PERMANENT, 384 CTLTYPE_STRING, "iostatnames", 385 SYSCTL_DESCR("I/O stats are being collected for these" 386 " devices"), 387 sysctl_hw_iostatnames, 0, NULL, 0, 388 CTL_HW, HW_IOSTATNAMES, CTL_EOL); 389 sysctl_createv(clog, 0, NULL, NULL, 390 CTLFLAG_PERMANENT, 391 CTLTYPE_STRUCT, "iostats", 392 SYSCTL_DESCR("Statistics on device I/O operations"), 393 sysctl_hw_iostats, 0, NULL, 0, 394 CTL_HW, HW_IOSTATS, CTL_EOL); 395 } 396