1 /* $NetBSD: subr_iostat.c,v 1.15.8.1 2009/04/04 17:49:21 snj 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, 2009 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 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
37 * (c) UNIX System Laboratories, Inc.
38 * All or some portions of this file are derived from material licensed
39 * to the University of California by American Telephone and Telegraph
40 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
41 * the permission of UNIX System Laboratories, Inc.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
68 */
69
70 #include <sys/cdefs.h>
71 __KERNEL_RCSID(0, "$NetBSD: subr_iostat.c,v 1.15.8.1 2009/04/04 17:49:21 snj Exp $");
72
73 #include <sys/param.h>
74 #include <sys/kernel.h>
75 #include <sys/malloc.h>
76 #include <sys/iostat.h>
77 #include <sys/sysctl.h>
78 #include <sys/rwlock.h>
79
80 /*
81 * Function prototypes for sysctl nodes
82 */
83 static int sysctl_hw_disknames(SYSCTLFN_PROTO);
84 static int sysctl_hw_iostatnames(SYSCTLFN_PROTO);
85 static int sysctl_hw_iostats(SYSCTLFN_PROTO);
86
87 static int
88 iostati_getnames(int disk_only, char *oldp, size_t *oldlenp, const void *newp,
89 u_int namelen);
90
91 /*
92 * A global list of all drives attached to the system. May grow or
93 * shrink over time.
94 */
95 struct iostatlist_head iostatlist = TAILQ_HEAD_INITIALIZER(iostatlist);
96 int iostat_count; /* number of drives in global drivelist */
97 krwlock_t iostatlist_lock;
98
99 /*
100 * Initialise the iostat subsystem.
101 */
102 void
103 iostat_init(void)
104 {
105
106 rw_init(&iostatlist_lock);
107 }
108
109 /*
110 * Searches the iostatlist for the iostat corresponding to the
111 * name provided.
112 */
113 struct io_stats *
114 iostat_find(const char *name)
115 {
116 struct io_stats *iostatp;
117
118 KASSERT(name != NULL);
119
120 rw_enter(&iostatlist_lock, RW_READER);
121 TAILQ_FOREACH(iostatp, &iostatlist, io_link) {
122 if (strcmp(iostatp->io_name, name) == 0) {
123 break;
124 }
125 }
126 rw_exit(&iostatlist_lock);
127
128 return iostatp;
129 }
130
131 /*
132 * Allocate and initialise memory for the i/o statistics.
133 */
134 struct io_stats *
135 iostat_alloc(int32_t type, void *parent, const char *name)
136 {
137 struct io_stats *stats;
138
139 stats = malloc(sizeof(struct io_stats), M_DEVBUF, M_WAITOK|M_ZERO);
140 if (stats == NULL)
141 panic("iostat_alloc: cannot allocate memory for stats buffer");
142
143 stats->io_type = type;
144 stats->io_parent = parent;
145 (void)strlcpy(stats->io_name, name, sizeof(stats->io_name));
146
147 /*
148 * Set the attached timestamp.
149 */
150 getmicrouptime(&stats->io_attachtime);
151
152 /*
153 * Link into the drivelist.
154 */
155 rw_enter(&iostatlist_lock, RW_WRITER);
156 TAILQ_INSERT_TAIL(&iostatlist, stats, io_link);
157 iostat_count++;
158 rw_exit(&iostatlist_lock);
159
160 return stats;
161 }
162
163 /*
164 * Remove i/o from stats collection.
165 */
166 void
167 iostat_free(struct io_stats *stats)
168 {
169
170 /*
171 * Remove from the iostat list.
172 */
173 if (iostat_count == 0)
174 panic("iostat_free: iostat_count == 0");
175 rw_enter(&iostatlist_lock, RW_WRITER);
176 TAILQ_REMOVE(&iostatlist, stats, io_link);
177 iostat_count--;
178 rw_exit(&iostatlist_lock);
179 free(stats, M_DEVBUF);
180 }
181
182 /*
183 * Increment a iostat busy counter. If the counter is going from
184 * 0 to 1, set the timestamp.
185 */
186 void
187 iostat_busy(struct io_stats *stats)
188 {
189
190 if (stats->io_busy++ == 0)
191 getmicrouptime(&stats->io_timestamp);
192 }
193
194 /*
195 * Decrement a iostat busy counter, increment the byte count, total busy
196 * time, and reset the timestamp.
197 */
198 void
199 iostat_unbusy(struct io_stats *stats, long bcount, int read)
200 {
201 struct timeval dv_time, diff_time;
202
203 if (stats->io_busy-- == 0) {
204 printf("%s: busy < 0\n", stats->io_name);
205 panic("iostat_unbusy");
206 }
207
208 getmicrouptime(&dv_time);
209
210 timersub(&dv_time, &stats->io_timestamp, &diff_time);
211 timeradd(&stats->io_time, &diff_time, &stats->io_time);
212
213 stats->io_timestamp = dv_time;
214 if (bcount > 0) {
215 if (read) {
216 stats->io_rbytes += bcount;
217 stats->io_rxfer++;
218 } else {
219 stats->io_wbytes += bcount;
220 stats->io_wxfer++;
221 }
222 }
223 }
224
225 /*
226 * Return non-zero if a device has an I/O request in flight.
227 */
228 bool
229 iostat_isbusy(struct io_stats *stats)
230 {
231
232 return stats->io_busy != 0;
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 rw_enter(&iostatlist_lock, RW_READER);
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 rw_exit(&iostatlist_lock);
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.
332 */
333 if (namelen == 0)
334 tocopy = offsetof(struct io_sysctl, busy);
335 else
336 tocopy = name[0];
337
338 if (where == NULL) {
339 *oldlenp = iostat_count * tocopy;
340 return (0);
341 }
342
343 error = 0;
344 left = *oldlenp;
345 memset(&sdrive, 0, sizeof(sdrive));
346 *oldlenp = 0;
347
348 rw_enter(&iostatlist_lock, RW_READER);
349 TAILQ_FOREACH(stats, &iostatlist, io_link) {
350 if (left < tocopy)
351 break;
352 strncpy(sdrive.name, stats->io_name, sizeof(sdrive.name));
353 sdrive.xfer = stats->io_rxfer + stats->io_wxfer;
354 sdrive.rxfer = stats->io_rxfer;
355 sdrive.wxfer = stats->io_wxfer;
356 sdrive.seek = stats->io_seek;
357 sdrive.bytes = stats->io_rbytes + stats->io_wbytes;
358 sdrive.rbytes = stats->io_rbytes;
359 sdrive.wbytes = stats->io_wbytes;
360 sdrive.attachtime_sec = stats->io_attachtime.tv_sec;
361 sdrive.attachtime_usec = stats->io_attachtime.tv_usec;
362 sdrive.timestamp_sec = stats->io_timestamp.tv_sec;
363 sdrive.timestamp_usec = stats->io_timestamp.tv_usec;
364 sdrive.time_sec = stats->io_time.tv_sec;
365 sdrive.time_usec = stats->io_time.tv_usec;
366 sdrive.busy = stats->io_busy;
367
368 error = copyout(&sdrive, where, min(tocopy, sizeof(sdrive)));
369 if (error)
370 break;
371 where += tocopy;
372 *oldlenp += tocopy;
373 left -= tocopy;
374 }
375 rw_exit(&iostatlist_lock);
376 return (error);
377 }
378
379 SYSCTL_SETUP(sysctl_io_stats_setup, "sysctl i/o stats setup")
380 {
381
382 sysctl_createv(clog, 0, NULL, NULL,
383 CTLFLAG_PERMANENT,
384 CTLTYPE_STRING, "disknames",
385 SYSCTL_DESCR("List of disk drives present"),
386 sysctl_hw_disknames, 0, NULL, 0,
387 CTL_HW, HW_DISKNAMES, CTL_EOL);
388 sysctl_createv(clog, 0, NULL, NULL,
389 CTLFLAG_PERMANENT,
390 CTLTYPE_STRING, "iostatnames",
391 SYSCTL_DESCR("I/O stats are being collected for these"
392 " devices"),
393 sysctl_hw_iostatnames, 0, NULL, 0,
394 CTL_HW, HW_IOSTATNAMES, CTL_EOL);
395 sysctl_createv(clog, 0, NULL, NULL,
396 CTLFLAG_PERMANENT,
397 CTLTYPE_STRUCT, "iostats",
398 SYSCTL_DESCR("Statistics on device I/O operations"),
399 sysctl_hw_iostats, 0, NULL, 0,
400 CTL_HW, HW_IOSTATS, CTL_EOL);
401 }
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