tools/power/turbostat: Add skeleton support for cstate enumeration

Add skeleton support for cstate enumeration.

Note that the previous logic may override the cstate setting for
multiple times for different reasons. The conversion to new cstate
enumeration must be done step by step following the previous code
order strictly.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Len Brown <len.brown@intel.com>

tools/power/x86/turbostat/turbostat.c

@@ -283,6 +283,7 @@ struct platform_features {
 	bool has_config_tdp;	/* MSR_CONFIG_TDP_NOMINAL/LEVEL_1/LEVEL_2/CONTROL, MSR_TURBO_ACTIVATION_RATIO */
 	int bclk_freq;		/* CPU base clock */
 	int crystal_freq;	/* Crystal clock to use when not available from CPUID.15 */
+	int supported_cstates;	/* Core cstates and Package cstates supported */
 	int cst_limit;		/* MSR_PKG_CST_CONFIG_CONTROL */
 	bool has_cst_auto_convension;	/* AUTOMATIC_CSTATE_CONVERSION bit in MSR_PKG_CST_CONFIG_CONTROL */
 	int trl_msrs;		/* MSR_TURBO_RATIO_LIMIT/LIMIT1/LIMIT2/SECONDARY, Atom TRL MSRs */
@@ -396,6 +397,21 @@ enum rapl_msrs {
 
 #define RAPL_AMD_F17H	(RAPL_AMD_PWR_UNIT | RAPL_AMD_CORE_ENERGY_STAT | RAPL_AMD_PKG_ENERGY_STAT)
 
+/* For Cstates */
+enum cstates {
+	CC1 = BIT(0),
+	CC3 = BIT(1),
+	CC6 = BIT(2),
+	CC7 = BIT(3),
+	PC2 = BIT(4),
+	PC3 = BIT(5),
+	PC6 = BIT(6),
+	PC7 = BIT(7),
+	PC8 = BIT(8),
+	PC9 = BIT(9),
+	PC10 = BIT(10),
+};
+
 static const struct platform_features nhm_features = {
 	.has_msr_misc_pwr_mgmt = 1,
 	.has_nhm_msrs = 1,
@@ -5560,6 +5576,44 @@ void linux_perf_init(void)
 	BIC_PRESENT(BIC_IPC);
 }
 
+void probe_cstates(void)
+{
+	probe_cst_limit();
+
+	if (platform->supported_cstates & CC1)
+		BIC_PRESENT(BIC_CPU_c1);
+
+	if (platform->supported_cstates & CC3)
+		BIC_PRESENT(BIC_CPU_c3);
+
+	if (platform->supported_cstates & CC6)
+		BIC_PRESENT(BIC_CPU_c6);
+
+	if (platform->supported_cstates & CC7)
+		BIC_PRESENT(BIC_CPU_c7);
+
+	if (platform->supported_cstates & PC2 && (pkg_cstate_limit >= PCL__2))
+		BIC_PRESENT(BIC_Pkgpc2);
+
+	if (platform->supported_cstates & PC3 && (pkg_cstate_limit >= PCL__3))
+		BIC_PRESENT(BIC_Pkgpc3);
+
+	if (platform->supported_cstates & PC6 && (pkg_cstate_limit >= PCL__6))
+		BIC_PRESENT(BIC_Pkgpc6);
+
+	if (platform->supported_cstates & PC7 && (pkg_cstate_limit >= PCL__7))
+		BIC_PRESENT(BIC_Pkgpc7);
+
+	if (platform->supported_cstates & PC8 && (pkg_cstate_limit >= PCL__8))
+		BIC_PRESENT(BIC_Pkgpc8);
+
+	if (platform->supported_cstates & PC9 && (pkg_cstate_limit >= PCL__9))
+		BIC_PRESENT(BIC_Pkgpc9);
+
+	if (platform->supported_cstates & PC10 && (pkg_cstate_limit >= PCL_10))
+		BIC_PRESENT(BIC_Pkgpc10);
+}
+
 void process_cpuid()
 {
 	unsigned int eax, ebx, ecx, edx;
@@ -5741,7 +5795,8 @@ void process_cpuid()
 	BIC_PRESENT(BIC_IRQ);
 	BIC_PRESENT(BIC_TSC_MHz);
 
-	probe_cst_limit();
+	probe_cstates();
+
 	if (platform->has_nhm_msrs) {
 		BIC_PRESENT(BIC_CPU_c1);
 		BIC_PRESENT(BIC_CPU_c3);