tools/power turbostat: Decode MSR_MISC_PWR_MGMT

This MSR is helpful to show if P-state HW coordination
is enabled or disabled.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index af3b955aad1d..c600340dfc4e 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2783,6 +2783,26 @@ void decode_misc_enable_msr(void)
                         msr & (1 << 18) ? "MONITOR" : "");
 }
 
+/*
+ * Decode MSR_MISC_PWR_MGMT
+ *
+ * Decode the bits according to the Nehalem documentation
+ * bit[0] seems to continue to have same meaning going forward
+ * bit[1] less so...
+ */
+void decode_misc_pwr_mgmt_msr(void)
+{
+        unsigned long long msr;
+
+        if (!do_nhm_platform_info)
+                return;
+
+        if (!get_msr(base_cpu, MSR_MISC_PWR_MGMT, &msr))
+                fprintf(stderr, "cpu%d: MSR_MISC_PWR_MGMT: 0x%08llx (%sable-EIST_Coordination %sable-EPB)\n",
+                        base_cpu, msr,
+                        msr & (1 << 0) ? "DIS" : "EN",
+                        msr & (1 << 1) ? "EN" : "DIS");
+}
 
 void process_cpuid()
 {
@@ -2936,6 +2956,9 @@ void process_cpuid()
         do_slm_cstates = is_slm(family, model);
         do_knl_cstates  = is_knl(family, model);
 
+        if (debug)
+                decode_misc_pwr_mgmt_msr();
+
         rapl_probe(family, model);
         perf_limit_reasons_probe(family, model);