cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

aperf.c (2125B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <math.h>
      3#include <unistd.h>
      4#include <stdio.h>
      5#include <stdlib.h>
      6#include <sys/types.h>
      7#include <sys/stat.h>
      8#include <fcntl.h>
      9#include <sys/timeb.h>
     10#include <sched.h>
     11#include <errno.h>
     12#include <string.h>
     13#include <time.h>
     14#include "../kselftest.h"
     15
     16#define MSEC_PER_SEC	1000L
     17#define NSEC_PER_MSEC	1000000L
     18
     19void usage(char *name) {
     20	printf ("Usage: %s cpunum\n", name);
     21}
     22
     23int main(int argc, char **argv) {
     24	unsigned int i, cpu, fd;
     25	char msr_file_name[64];
     26	long long tsc, old_tsc, new_tsc;
     27	long long aperf, old_aperf, new_aperf;
     28	long long mperf, old_mperf, new_mperf;
     29	struct timespec before, after;
     30	long long int start, finish, total;
     31	cpu_set_t cpuset;
     32
     33	if (argc != 2) {
     34		usage(argv[0]);
     35		return 1;
     36	}
     37
     38	errno = 0;
     39	cpu = strtol(argv[1], (char **) NULL, 10);
     40
     41	if (errno) {
     42		usage(argv[0]);
     43		return 1;
     44	}
     45
     46	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
     47	fd = open(msr_file_name, O_RDONLY);
     48
     49	if (fd == -1) {
     50		printf("/dev/cpu/%d/msr: %s\n", cpu, strerror(errno));
     51		return KSFT_SKIP;
     52	}
     53
     54	CPU_ZERO(&cpuset);
     55	CPU_SET(cpu, &cpuset);
     56
     57	if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
     58		perror("Failed to set cpu affinity");
     59		return 1;
     60	}
     61
     62	if (clock_gettime(CLOCK_MONOTONIC, &before) < 0) {
     63		perror("clock_gettime");
     64		return 1;
     65	}
     66	pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
     67	pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
     68	pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);
     69
     70	for (i=0; i<0x8fffffff; i++) {
     71		sqrt(i);
     72	}
     73
     74	if (clock_gettime(CLOCK_MONOTONIC, &after) < 0) {
     75		perror("clock_gettime");
     76		return 1;
     77	}
     78	pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
     79	pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
     80	pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);
     81
     82	tsc = new_tsc-old_tsc;
     83	aperf = new_aperf-old_aperf;
     84	mperf = new_mperf-old_mperf;
     85
     86	start = before.tv_sec*MSEC_PER_SEC + before.tv_nsec/NSEC_PER_MSEC;
     87	finish = after.tv_sec*MSEC_PER_SEC + after.tv_nsec/NSEC_PER_MSEC;
     88	total = finish - start;
     89
     90	printf("runTime: %4.2f\n", 1.0*total/MSEC_PER_SEC);
     91	printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
     92	return 0;
     93}