1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <math.h>
3*4882a593Smuzhiyun #include <unistd.h>
4*4882a593Smuzhiyun #include <stdio.h>
5*4882a593Smuzhiyun #include <stdlib.h>
6*4882a593Smuzhiyun #include <sys/types.h>
7*4882a593Smuzhiyun #include <sys/stat.h>
8*4882a593Smuzhiyun #include <fcntl.h>
9*4882a593Smuzhiyun #include <sys/timeb.h>
10*4882a593Smuzhiyun #include <sched.h>
11*4882a593Smuzhiyun #include <errno.h>
12*4882a593Smuzhiyun #include <string.h>
13*4882a593Smuzhiyun #include "../kselftest.h"
14*4882a593Smuzhiyun
usage(char * name)15*4882a593Smuzhiyun void usage(char *name) {
16*4882a593Smuzhiyun printf ("Usage: %s cpunum\n", name);
17*4882a593Smuzhiyun }
18*4882a593Smuzhiyun
main(int argc,char ** argv)19*4882a593Smuzhiyun int main(int argc, char **argv) {
20*4882a593Smuzhiyun unsigned int i, cpu, fd;
21*4882a593Smuzhiyun char msr_file_name[64];
22*4882a593Smuzhiyun long long tsc, old_tsc, new_tsc;
23*4882a593Smuzhiyun long long aperf, old_aperf, new_aperf;
24*4882a593Smuzhiyun long long mperf, old_mperf, new_mperf;
25*4882a593Smuzhiyun struct timeb before, after;
26*4882a593Smuzhiyun long long int start, finish, total;
27*4882a593Smuzhiyun cpu_set_t cpuset;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun if (argc != 2) {
30*4882a593Smuzhiyun usage(argv[0]);
31*4882a593Smuzhiyun return 1;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun errno = 0;
35*4882a593Smuzhiyun cpu = strtol(argv[1], (char **) NULL, 10);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun if (errno) {
38*4882a593Smuzhiyun usage(argv[0]);
39*4882a593Smuzhiyun return 1;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
43*4882a593Smuzhiyun fd = open(msr_file_name, O_RDONLY);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun if (fd == -1) {
46*4882a593Smuzhiyun printf("/dev/cpu/%d/msr: %s\n", cpu, strerror(errno));
47*4882a593Smuzhiyun return KSFT_SKIP;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun CPU_ZERO(&cpuset);
51*4882a593Smuzhiyun CPU_SET(cpu, &cpuset);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
54*4882a593Smuzhiyun perror("Failed to set cpu affinity");
55*4882a593Smuzhiyun return 1;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun ftime(&before);
59*4882a593Smuzhiyun pread(fd, &old_tsc, sizeof(old_tsc), 0x10);
60*4882a593Smuzhiyun pread(fd, &old_aperf, sizeof(old_mperf), 0xe7);
61*4882a593Smuzhiyun pread(fd, &old_mperf, sizeof(old_aperf), 0xe8);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun for (i=0; i<0x8fffffff; i++) {
64*4882a593Smuzhiyun sqrt(i);
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun ftime(&after);
68*4882a593Smuzhiyun pread(fd, &new_tsc, sizeof(new_tsc), 0x10);
69*4882a593Smuzhiyun pread(fd, &new_aperf, sizeof(new_mperf), 0xe7);
70*4882a593Smuzhiyun pread(fd, &new_mperf, sizeof(new_aperf), 0xe8);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun tsc = new_tsc-old_tsc;
73*4882a593Smuzhiyun aperf = new_aperf-old_aperf;
74*4882a593Smuzhiyun mperf = new_mperf-old_mperf;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun start = before.time*1000 + before.millitm;
77*4882a593Smuzhiyun finish = after.time*1000 + after.millitm;
78*4882a593Smuzhiyun total = finish - start;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun printf("runTime: %4.2f\n", 1.0*total/1000);
81*4882a593Smuzhiyun printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
82*4882a593Smuzhiyun return 0;
83*4882a593Smuzhiyun }
84