[PATCH v3 09/14 RESEND] xenpm: Print HWP parameters

[Jason Andryuk <jandryuk@xxxxxxxxx>]

Print HWP-specific parameters.  Some are always present, but others
depend on hardware support.

Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
---
v2:
Style fixes
Declare i outside loop
Replace repearted hardware/configured limits with spaces
Fixup for hw_ removal
Use XEN_HWP_GOVERNOR
Use HWP_ACT_WINDOW_EXPONENT_*
Remove energy_perf hw autonomous - 0 doesn't mean autonomous
---
 tools/misc/xenpm.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index ce8d7644d0..b2defde0d4 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -708,6 +708,44 @@ void start_gather_func(int argc, char *argv[])
     pause();
 }
 
+static void calculate_hwp_activity_window(const xc_hwp_para_t *hwp,
+                                          unsigned int *activity_window,
+                                          const char **units)
+{
+    unsigned int mantissa = hwp->activity_window & 
HWP_ACT_WINDOW_MANTISSA_MASK;
+    unsigned int exponent =
+        (hwp->activity_window >> HWP_ACT_WINDOW_EXPONENT_SHIFT) &
+            HWP_ACT_WINDOW_EXPONENT_MASK;
+    unsigned int multiplier = 1;
+    unsigned int i;
+
+    if ( hwp->activity_window == 0 )
+    {
+        *units = "hardware selected";
+        *activity_window = 0;
+
+        return;
+    }
+
+    if ( exponent >= 6 )
+    {
+        *units = "s";
+        exponent -= 6;
+    }
+    else if ( exponent >= 3 )
+    {
+        *units = "ms";
+        exponent -= 3;
+    }
+    else
+        *units = "us";
+
+    for ( i = 0; i < exponent; i++ )
+        multiplier *= 10;
+
+    *activity_window = mantissa * multiplier;
+}
+
 /* print out parameters about cpu frequency */
 static void print_cpufreq_para(int cpuid, struct xc_get_cpufreq_para 
*p_cpufreq)
 {
@@ -773,6 +811,33 @@ static void print_cpufreq_para(int cpuid, struct 
xc_get_cpufreq_para *p_cpufreq)
                p_cpufreq->scaling_cur_freq);
     }
 
+    if ( strcmp(p_cpufreq->scaling_governor, XEN_HWP_GOVERNOR) == 0 )
+    {
+        const xc_hwp_para_t *hwp = &p_cpufreq->u.hwp_para;
+
+        printf("hwp variables        :\n");
+        printf("  hardware limits    : lowest [%u] most_efficient [%u]\n",
+               hwp->lowest, hwp->most_efficient);
+        printf("                     : guaranteed [%u] highest [%u]\n",
+               hwp->guaranteed, hwp->highest);
+        printf("  configured limits  : min [%u] max [%u] energy_perf [%u]\n",
+               hwp->minimum, hwp->maximum, hwp->energy_perf);
+
+        if ( hwp->features & XEN_SYSCTL_HWP_FEAT_ACT_WINDOW )
+        {
+            unsigned int activity_window;
+            const char *units;
+
+            calculate_hwp_activity_window(hwp, &activity_window, &units);
+            printf("                     : activity_window [%u %s]\n",
+                   activity_window, units);
+        }
+
+        printf("                     : desired [%u%s]\n",
+               hwp->desired,
+               hwp->desired ? "" : " hw autonomous");
+    }
+
     printf("turbo mode           : %s\n",
            p_cpufreq->turbo_enabled ? "enabled" : "disabled or n/a");
     printf("\n");
-- 
2.40.0