subr_iostat.c revision 1.8 1 /* $NetBSD: subr_iostat.c,v 1.8 2006/04/21 13:53:30 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 1.8 2006/04/21 13:53:30 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);
139 if (stats == NULL)
140 panic("iostat_alloc: cannot allocate memory for stats buffer");
141
142 stats->io_type = type;
143 stats->io_rxfer = 0;
144 stats->io_rbytes = 0;
145 stats->io_wxfer = 0;
146 stats->io_wbytes = 0;
147
148 /*
149 * Set the attached timestamp.
150 */
151 s = splclock();
152 stats->io_attachtime = mono_time;
153 splx(s);
154
155 timerclear(&stats->io_time);
156 timerclear(&stats->io_timestamp);
157
158 /*
159 * Link into the drivelist.
160 */
161 simple_lock(&iostatlist_slock);
162 TAILQ_INSERT_TAIL(&iostatlist, stats, io_link);
163 iostat_count++;
164 simple_unlock(&iostatlist_slock);
165
166 return stats;
167 }
168
169 /*
170 * Remove i/o from stats collection.
171 */
172 void
173 iostat_free(struct io_stats *stats)
174 {
175
176 /*
177 * Remove from the iostat list.
178 */
179 if (iostat_count == 0)
180 panic("iostat_free: iostat_count == 0");
181 simple_lock(&iostatlist_slock);
182 TAILQ_REMOVE(&iostatlist, stats, io_link);
183 iostat_count--;
184 simple_unlock(&iostatlist_slock);
185 free(stats, M_DEVBUF);
186 }
187
188 /*
189 * Increment a iostat busy counter. If the counter is going from
190 * 0 to 1, set the timestamp.
191 */
192 void
193 iostat_busy(struct io_stats *stats)
194 {
195 int s;
196
197 /*
198 * XXX We'd like to use something as accurate as microtime(),
199 * but that doesn't depend on the system TOD clock.
200 */
201 if (stats->io_busy++ == 0) {
202 s = splclock();
203 stats->io_timestamp = mono_time;
204 splx(s);
205 }
206 }
207
208 /*
209 * Decrement a iostat busy counter, increment the byte count, total busy
210 * time, and reset the timestamp.
211 */
212 void
213 iostat_unbusy(struct io_stats *stats, long bcount, int read)
214 {
215 int s;
216 struct timeval dv_time, diff_time;
217
218 if (stats->io_busy-- == 0) {
219 printf("%s: busy < 0\n", stats->io_name);
220 panic("iostat_unbusy");
221 }
222
223 s = splclock();
224 dv_time = mono_time;
225 splx(s);
226
227 timersub(&dv_time, &stats->io_timestamp, &diff_time);
228 timeradd(&stats->io_time, &diff_time, &stats->io_time);
229
230 stats->io_timestamp = dv_time;
231 if (bcount > 0) {
232 if (read) {
233 stats->io_rbytes += bcount;
234 stats->io_rxfer++;
235 } else {
236 stats->io_wbytes += bcount;
237 stats->io_wxfer++;
238 }
239 }
240 }
241
242 /*
243 * Increment the seek counter. This does look almost redundant but it
244 * abstracts the stats gathering.
245 */
246 void
247 iostat_seek(struct io_stats *stats)
248 {
249
250 stats->io_seek++;
251 }
252
253 static int
254 sysctl_hw_disknames(SYSCTLFN_ARGS)
255 {
256
257 return iostati_getnames(1, oldp, oldlenp, newp, namelen);
258 }
259
260 static int
261 sysctl_hw_iostatnames(SYSCTLFN_ARGS)
262 {
263
264 return iostati_getnames(0, oldp, oldlenp, newp, namelen);
265 }
266
267 static int
268 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
269 u_int namelen)
270 {
271 char bf[IOSTATNAMELEN + 1];
272 char *where = oldp;
273 struct io_stats *stats;
274 size_t needed, left, slen;
275 int error, first;
276
277 if (newp != NULL)
278 return (EPERM);
279 if (namelen != 0)
280 return (EINVAL);
281
282 first = 1;
283 error = 0;
284 needed = 0;
285 left = *oldlenp;
286
287 simple_lock(&iostatlist_slock);
288 for (stats = TAILQ_FIRST(&iostatlist); stats != NULL;
289 stats = TAILQ_NEXT(stats, io_link)) {
290 if ((disk_only == 1) && (stats->io_type != IOSTAT_DISK))
291 continue;
292
293 if (where == NULL)
294 needed += strlen(stats->io_name) + 1;
295 else {
296 memset(bf, 0, sizeof(bf));
297 if (first) {
298 strncpy(bf, stats->io_name, sizeof(bf));
299 first = 0;
300 } else {
301 bf[0] = ' ';
302 strncpy(bf + 1, stats->io_name,
303 sizeof(bf) - 1);
304 }
305 bf[IOSTATNAMELEN] = '\0';
306 slen = strlen(bf);
307 if (left < slen + 1)
308 break;
309 /* +1 to copy out the trailing NUL byte */
310 error = copyout(bf, where, slen + 1);
311 if (error)
312 break;
313 where += slen;
314 needed += slen;
315 left -= slen;
316 }
317 }
318 simple_unlock(&iostatlist_slock);
319 *oldlenp = needed;
320 return (error);
321 }
322
323 static int
324 sysctl_hw_iostats(SYSCTLFN_ARGS)
325 {
326 struct io_sysctl sdrive;
327 struct io_stats *stats;
328 char *where = oldp;
329 size_t tocopy, left;
330 int error;
331
332 if (newp != NULL)
333 return (EPERM);
334
335 /*
336 * The original hw.diskstats call was broken and did not require
337 * the userland to pass in it's size of struct disk_sysctl. This
338 * was fixed after NetBSD 1.6 was released, and any applications
339 * that do not pass in the size are given an error only, unless
340 * we care about 1.6 compatibility.
341 */
342 if (namelen == 0)
343 #ifdef COMPAT_16
344 tocopy = offsetof(struct io_sysctl, busy);
345 #else
346 return (EINVAL);
347 #endif
348 else
349 tocopy = name[0];
350
351 if (where == NULL) {
352 *oldlenp = iostat_count * tocopy;
353 return (0);
354 }
355
356 error = 0;
357 left = *oldlenp;
358 memset(&sdrive, 0, sizeof(sdrive));
359 *oldlenp = 0;
360
361 simple_lock(&iostatlist_slock);
362 TAILQ_FOREACH(stats, &iostatlist, io_link) {
363 if (left < tocopy)
364 break;
365 strncpy(sdrive.name, stats->io_name, sizeof(sdrive.name));
366 sdrive.xfer = stats->io_rxfer + stats->io_wxfer;
367 sdrive.rxfer = stats->io_rxfer;
368 sdrive.wxfer = stats->io_wxfer;
369 sdrive.seek = stats->io_seek;
370 sdrive.bytes = stats->io_rbytes + stats->io_wbytes;
371 sdrive.rbytes = stats->io_rbytes;
372 sdrive.wbytes = stats->io_wbytes;
373 sdrive.attachtime_sec = stats->io_attachtime.tv_sec;
374 sdrive.attachtime_usec = stats->io_attachtime.tv_usec;
375 sdrive.timestamp_sec = stats->io_timestamp.tv_sec;
376 sdrive.timestamp_usec = stats->io_timestamp.tv_usec;
377 sdrive.time_sec = stats->io_time.tv_sec;
378 sdrive.time_usec = stats->io_time.tv_usec;
379 sdrive.busy = stats->io_busy;
380
381 error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive)));
382 if (error)
383 break;
384 where += tocopy;
385 *oldlenp += tocopy;
386 left -= tocopy;
387 }
388 simple_unlock(&iostatlist_slock);
389 return (error);
390 }
391
392 SYSCTL_SETUP(sysctl_io_stats_setup, "sysctl i/o stats setup")
393 {
394
395 sysctl_createv(clog, 0, NULL, NULL,
396 CTLFLAG_PERMANENT,
397 CTLTYPE_STRING, "disknames",
398 SYSCTL_DESCR("List of disk drives present"),
399 sysctl_hw_disknames, 0, NULL, 0,
400 CTL_HW, HW_DISKNAMES, CTL_EOL);
401 sysctl_createv(clog, 0, NULL, NULL,
402 CTLFLAG_PERMANENT,
403 CTLTYPE_STRING, "iostatnames",
404 SYSCTL_DESCR("I/O stats are being collected for these"
405 " devices"),
406 sysctl_hw_iostatnames, 0, NULL, 0,
407 CTL_HW, HW_IOSTATNAMES, CTL_EOL);
408 sysctl_createv(clog, 0, NULL, NULL,
409 CTLFLAG_PERMANENT,
410 CTLTYPE_STRUCT, "iostats",
411 SYSCTL_DESCR("Statistics on device I/O operations"),
412 sysctl_hw_iostats, 0, NULL, 0,
413 CTL_HW, HW_IOSTATS, CTL_EOL);
414 }
415