xref: /freebsd/share/examples/perfmon/perfmon.c (revision 77c1fcec914bae1232762ca0b0462abd6957ff26)
1 /*
2  * Copyright 1996 Massachusetts Institute of Technology
3  *
4  * Permission to use, copy, modify, and distribute this software and
5  * its documentation for any purpose and without fee is hereby
6  * granted, provided that both the above copyright notice and this
7  * permission notice appear in all copies, that both the above
8  * copyright notice and this permission notice appear in all
9  * supporting documentation, and that the name of M.I.T. not be used
10  * in advertising or publicity pertaining to distribution of the
11  * software without specific, written prior permission.  M.I.T. makes
12  * no representations about the suitability of this software for any
13  * purpose.  It is provided "as is" without express or implied
14  * warranty.
15  *
16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 
32 #include <sys/types.h>
33 #include <sys/ioctl.h>
34 
35 #include <machine/cpu.h>
36 #include <machine/perfmon.h>
37 
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <err.h>
42 #include <unistd.h>
43 #include <fcntl.h>
44 #include <limits.h>
45 #include <errno.h>
46 
47 static int getnum(const char *, int, int);
48 static void usage(const char *) __dead2;
49 
50 int
51 main(int argc, char **argv)
52 {
53 	int c, fd, num;
54 	int loops, i, sleeptime;
55 	char *cmd;
56 	struct pmc pmc;
57 	struct pmc_tstamp then, now;
58 	struct pmc_data value;
59 	quad_t *buf;
60 	double total;
61 
62 	pmc.pmc_num = 0;
63 	pmc.pmc_event = 0;
64 	pmc.pmc_unit = 0;
65 	pmc.pmc_flags = 0;
66 	pmc.pmc_mask = 0;
67 	cmd = NULL;
68 	loops = 50;
69 	sleeptime = 0;
70 
71 	while ((c = getopt(argc, argv, "s:l:uoeiU:m:c:")) != -1) {
72 		switch(c) {
73 		case 'u':
74 			pmc.pmc_flags |= PMCF_USR;
75 			break;
76 		case 'o':
77 			pmc.pmc_flags |= PMCF_OS;
78 			break;
79 		case 'e':
80 			pmc.pmc_flags |= PMCF_E;
81 			break;
82 		case 'i':
83 			pmc.pmc_flags |= PMCF_INV;
84 			break;
85 		case 'U':
86 			pmc.pmc_unit = getnum(optarg, 0, 256);
87 			break;
88 		case 'm':
89 			pmc.pmc_mask = getnum(optarg, 0, 256);
90 			break;
91 		case 'l':
92 			loops = getnum(optarg, 1, INT_MAX - 1);
93 			break;
94 		case 's':
95 			sleeptime = getnum(optarg, 0, INT_MAX - 1);
96 			break;
97 		case 'c':
98 			cmd = optarg;
99 			break;
100 		default:
101 			usage(argv[0]);
102 		}
103 	}
104 
105 	if (argc - optind != 1)
106 		usage(argv[0]);
107 
108 	pmc.pmc_event = getnum(argv[optind], 0, 255);
109 
110 	buf = malloc((loops + 1) * sizeof *buf);
111 	if (!buf)
112 		err(1, "malloc(%lu)", (unsigned long)(loops +1) * sizeof *buf);
113 
114 	fd = open(_PATH_PERFMON, O_RDWR, 0);
115 	if (fd < 0)
116 		err(1, "open: " _PATH_PERFMON);
117 
118 	if (ioctl(fd, PMIOSETUP, &pmc) < 0)
119 		err(1, "ioctl(PMIOSETUP)");
120 
121 	if (ioctl(fd, PMIOTSTAMP, &then) < 0)
122 		err(1, "ioctl(PMIOTSTAMP)");
123 
124 	num = 0;
125 	if (ioctl(fd, PMIOSTART, &num) < 0)
126 		err(1, "ioctl(PMIOSTART)");
127 
128 	value.pmcd_num = 0;
129 	for (i = 0; i < loops; i++) {
130 		if (ioctl(fd, PMIOSTOP, &num) < 0)
131 			err(1, "ioctl(PMIOSTOP)");
132 		if (ioctl(fd, PMIOREAD, &value) < 0)
133 			err(1, "ioctl(PMIOREAD)");
134 		buf[i] = value.pmcd_value;
135 		if (ioctl(fd, PMIORESET, &value.pmcd_num) < 0)
136 			err(1, "ioctl(PMIORESET)");
137 		if (ioctl(fd, PMIOSTART, &num) < 0)
138 			err(1, "ioctl(PMIOSTART)");
139 		if (sleeptime)
140 			sleep(sleeptime);
141 		if (cmd)
142 			system(cmd);
143 	}
144 
145 	if (ioctl(fd, PMIOSTOP, &num) < 0)
146 		err(1, "ioctl(PMIOSTOP)");
147 	if (ioctl(fd, PMIOREAD, &value) < 0)
148 		err(1, "ioctl(PMIOREAD)");
149 	buf[i] = value.pmcd_value;
150 	if (ioctl(fd, PMIOTSTAMP, &now) < 0)
151 		err(1, "ioctl(PMIOTSTAMP)");
152 
153 	total = 0;
154 	for (i = 1; i <= loops; i++) {
155 		printf("%d: %qd\n", i, buf[i]);
156 		total += buf[i];
157 	}
158 	printf("total: %f\nmean: %f\n", total, total / loops);
159 
160 	printf("clocks (at %d-MHz): %qd\n", now.pmct_rate,
161 	       now.pmct_value - then.pmct_value);
162 
163 	return 0;
164 }
165 
166 static int
167 getnum(const char *buf, int min, int max)
168 {
169 	char *ep;
170 	long l;
171 
172 	errno = 0;
173 	l = strtol(buf, &ep, 0);
174 	if (*buf && !*ep && !errno) {
175 		if (l < min || l > max) {
176 			errx(1, "%s: must be between %d and %d",
177 			     buf, min, max);
178 		}
179 		return (int)l;
180 	}
181 
182 	errx(1, "%s: parameter must be an integer", buf);
183 }
184 
185 static void
186 usage(const char *pname)
187 {
188 	fprintf(stderr,
189 	"usage: %s [-eiou] [-c command] [-l nloops] [-m mask] [-s sleeptime]\n"
190 	"       [-U unit] counter\n",
191 		pname);
192 	exit(1);
193 }
194