tools, testing, add test for intel_pstate driver

This test used the cpupower utility to set the cpu frequency from the
maximum turbo value to the minimum supported value in steps of 100 MHz.

The results are displayed in a table which indicate the "Target" state,
or the requested frequency in MHz, the Actual frequency, as read from
/proc/cpuinfo, the difference between the Target and Actual frequencies,
and the value of MSR 0x199 (MSR_IA32_PERF_CTL) which indicates what
pstate the cpu is in, and the value of
/sys/devices/system/cpu/intel_pstate/max_perf_pct X maximum turbo state

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: linux-api@vger.kernel.org
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/intel_pstate/aperf.c

@@ -0,0 +1,80 @@
+#include <math.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/timeb.h>
+#include <sched.h>
+#include <errno.h>
+
+void usage(char *name) {
+	printf ("Usage: %s cpunum\n", name);
+}
+
+int main(int argc, char **argv) {
+	int i, cpu, fd;
+	char msr_file_name[64];
+	long long tsc, old_tsc, new_tsc;
+	long long aperf, old_aperf, new_aperf;
+	long long mperf, old_mperf, new_mperf;
+	struct timeb before, after;
+	long long int start, finish, total;
+	cpu_set_t cpuset;
+
+	if (argc != 2) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	errno = 0;
+	cpu = strtol(argv[1], (char **) NULL, 10);
+
+	if (errno) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+	fd = open(msr_file_name, O_RDONLY);
+
+	if (fd == -1) {
+		perror("Failed to open");
+		return 1;
+	}
+
+	CPU_ZERO(&cpuset);
+	CPU_SET(cpu, &cpuset);
+
+	if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) {
+		perror("Failed to set cpu affinity");
+		return 1;
+	}
+
+	ftime(&before);
+	pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
+	pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
+	pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);
+
+	for (i=0; i<0x8fffffff; i++) {
+		sqrt(i);
+	}
+
+	ftime(&after);
+	pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
+	pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
+	pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);
+
+	tsc = new_tsc-old_tsc;
+	aperf = new_aperf-old_aperf;
+	mperf = new_mperf-old_mperf;
+
+	start = before.time*1000 + before.millitm;
+	finish = after.time*1000 + after.millitm;
+	total = finish - start;
+
+	printf("runTime: %4.2f\n", 1.0*total/1000);
+	printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
+	return 0;
+}