xenpm: Add option to report average CPU frequency

The average is calculated over the period of time from the last
xenpm report of the average CPU frequency.

Reporting the average CPU frequency helps confirm the level of turbo
boost being achieved per CPU.

Signed-off-by: Malcolm Crossley <malcolm.crossley@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/misc/xenpm.c

@@ -45,6 +45,8 @@ void show_help(void)
             "xenpm command list:\n\n"
             " get-cpuidle-states    [cpuid]       list cpu idle info of CPU <cpuid> or all\n"
             " get-cpufreq-states    [cpuid]       list cpu freq info of CPU <cpuid> or all\n"
+            " get-cpufreq-average   [cpuid]       average cpu frequency since last invocation\n"
+            "                                     for CPU <cpuid> or all\n"
             " get-cpufreq-para      [cpuid]       list cpu freq parameter of CPU <cpuid> or all\n"
             " set-scaling-maxfreq   [cpuid] <HZ>  set max cpu frequency <HZ> on CPU <cpuid>\n"
             "                                     or all CPUs\n"
@@ -343,6 +345,40 @@ void pxstat_func(int argc, char *argv[])
         show_pxstat_by_cpuid(xc_handle, cpuid);
 }
 
+static int show_cpufreq_by_cpuid(xc_interface *xc_handle, int cpuid)
+{
+    int ret = 0;
+    int average_cpufreq;
+
+    ret = get_avgfreq_by_cpuid(xc_handle, cpuid, &average_cpufreq);
+    if ( ret )
+        return ret;
+
+    printf("cpu id               : %d\n", cpuid);
+    printf("average cpu frequency: %d\n", average_cpufreq);
+    printf("\n");
+    return 0;
+}
+
+void cpufreq_func(int argc, char *argv[])
+{
+    int cpuid = -1;
+
+    if ( argc > 0 )
+        parse_cpuid(argv[0], &cpuid);
+
+    if ( cpuid < 0 )
+    {
+        /* show average frequency on all cpus */
+        int i;
+        for ( i = 0; i < max_cpu_nr; i++ )
+            if ( show_cpufreq_by_cpuid(xc_handle, i) == -ENODEV )
+                break;
+    }
+    else
+        show_cpufreq_by_cpuid(xc_handle, cpuid);
+}
+
 static uint64_t usec_start, usec_end;
 static struct xc_cx_stat *cxstat, *cxstat_start, *cxstat_end;
 static struct xc_px_stat *pxstat, *pxstat_start, *pxstat_end;
@@ -1129,6 +1165,7 @@ struct {
     { "help", help_func },
     { "get-cpuidle-states", cxstat_func },
     { "get-cpufreq-states", pxstat_func },
+    { "get-cpufreq-average", cpufreq_func },
     { "start", start_gather_func },
     { "get-cpufreq-para", cpufreq_para_func },
     { "set-scaling-maxfreq", scaling_max_freq_func },