cpupower: fix TSC MHz calculation for Mperf monitor

Commit 'cpupower: Make TSC read per CPU for Mperf monitor' (c2adb1877b7)
changes TSC counter reads to per cpu, but left time diff global (from
start of all cpus to end of all cpus), thus diff(time) is too large for
a cpu's tsc counting, resulting in far less than acutal TSC_Mhz and thus
`cpupower monitor` showing far less than actual cpu realtime frequency.

Fix this by making timediff also per cpu.

/proc/cpuinfo shows frequency:
cat /proc/cpuinfo | egrep -e 'processor' -e 'MHz'
...
processor : 171
cpu MHz   : 4108.498
...

before fix (System 100% busy):
    | Mperf              || Idle_Stats
 CPU| C0   | Cx   | Freq  || POLL | C1   | C2
 171|  0.77| 99.23|  2279||  0.00|  0.00|  0.00

after fix (System 100% busy):
    | Mperf              || Idle_Stats
 CPU| C0   | Cx   | Freq  || POLL | C1   | C2
 171|  0.46| 99.54|  4095||  0.00|  0.00|  0.00

Fixes: c2adb1877b76f ("cpupower: Make TSC read per CPU for Mperf monitor")
Signed-off-by: He Rongguang <herongguang@linux.alibaba.com>
---
 .../cpupower/utils/idle_monitor/mperf_monitor.c   | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

 	{
@@ -174,7 +174,7 @@ static int mperf_get_count_percent(unsigned int id,
double *percent,
 		dprint("%s: TSC Ref - mperf_diff: %llu, tsc_diff: %llu\n",
 		       mperf_cstates[id].name, mperf_diff, tsc_diff);
 	} else if (max_freq_mode == MAX_FREQ_SYSFS) {
-		timediff = max_frequency * timespec_diff_us(time_start, time_end);
+		timediff = max_frequency * timespec_diff_us(time_start[cpu],
time_end[cpu]);
 		*percent = 100.0 * mperf_diff / timediff;
 		dprint("%s: MAXFREQ - mperf_diff: %llu, time_diff: %llu\n",
 		       mperf_cstates[id].name, mperf_diff, timediff);
@@ -207,7 +207,7 @@ static int mperf_get_count_freq(unsigned int id,
unsigned long long *count,
 	if (max_freq_mode == MAX_FREQ_TSC_REF) {
 		/* Calculate max_freq from TSC count */
 		tsc_diff = tsc_at_measure_end[cpu] - tsc_at_measure_start[cpu];
-		time_diff = timespec_diff_us(time_start, time_end);
+		time_diff = timespec_diff_us(time_start[cpu], time_end[cpu]);
 		max_frequency = tsc_diff / time_diff;
 	}

@@ -226,9 +226,8 @@ static int mperf_start(void)
 {
 	int cpu;

-	clock_gettime(CLOCK_REALTIME, &time_start);
-
 	for (cpu = 0; cpu < cpu_count; cpu++) {
+		clock_gettime(CLOCK_REALTIME, &time_start[cpu]);
 		mperf_get_tsc(&tsc_at_measure_start[cpu]);
 		mperf_init_stats(cpu);
 	}
@@ -243,9 +242,9 @@ static int mperf_stop(void)
 	for (cpu = 0; cpu < cpu_count; cpu++) {
 		mperf_measure_stats(cpu);
 		mperf_get_tsc(&tsc_at_measure_end[cpu]);
+		clock_gettime(CLOCK_REALTIME, &time_end[cpu]);
 	}

-	clock_gettime(CLOCK_REALTIME, &time_end);
 	return 0;
 }

@@ -349,6 +348,8 @@ struct cpuidle_monitor *mperf_register(void)
 	aperf_current_count = calloc(cpu_count, sizeof(unsigned long long));
 	tsc_at_measure_start = calloc(cpu_count, sizeof(unsigned long long));
 	tsc_at_measure_end = calloc(cpu_count, sizeof(unsigned long long));
+	time_start = calloc(cpu_count, sizeof(struct timespec));
+	time_end = calloc(cpu_count, sizeof(struct timespec));
 	mperf_monitor.name_len = strlen(mperf_monitor.name);
 	return &mperf_monitor;
 }
@@ -361,6 +362,8 @@ void mperf_unregister(void)
 	free(aperf_current_count);
 	free(tsc_at_measure_start);
 	free(tsc_at_measure_end);
+	free(time_start);
+	free(time_end);
 	free(is_valid);
 }