3 files changed, 53 insertions, 5 deletions

diff --git a/tools/power/cpupower/utils/helpers/cpuid.c b/tools/power/cpupower/utils/helpers/cpuid.c
index 944b2c1659d8..a97f091fcf2b 100644
--- a/tools/power/cpupower/utils/helpers/cpuid.c
+++ b/tools/power/cpupower/utils/helpers/cpuid.c
@@ -130,10 +130,37 @@ out:
 			cpu_info->caps |= CPUPOWER_CAP_AMD_CBP;
 	}
 
-	/* Intel's perf-bias MSR support */
 	if (cpu_info->vendor == X86_VENDOR_INTEL) {
+		/* Intel's perf-bias MSR support */
 		if (cpuid_level >= 6 && (cpuid_ecx(6) & (1 << 3)))
 			cpu_info->caps |= CPUPOWER_CAP_PERF_BIAS;
+
+		/* Intel's Turbo Ratio Limit support */
+		if (cpu_info->family == 6) {
+			switch (cpu_info->model) {
+			case 0x1A:	/* Core i7, Xeon 5500 series
+					 * Bloomfield, Gainstown NHM-EP
+					 */
+			case 0x1E:	/* Core i7 and i5 Processor
+					 * Clarksfield, Lynnfield, Jasper Forest
+					 */
+			case 0x1F:	/* Core i7 and i5 Processor - Nehalem */
+			case 0x25:	/* Westmere Client
+					 * Clarkdale, Arrandale
+					 */
+			case 0x2C:	/* Westmere EP - Gulftown */
+				cpu_info->caps |= CPUPOWER_CAP_HAS_TURBO_RATIO;
+			case 0x2A:	/* SNB */
+			case 0x2D:	/* SNB Xeon */
+				cpu_info->caps |= CPUPOWER_CAP_HAS_TURBO_RATIO;
+				cpu_info->caps |= CPUPOWER_CAP_IS_SNB;
+				break;
+			case 0x2E:	/* Nehalem-EX Xeon - Beckton */
+			case 0x2F:	/* Westmere-EX Xeon - Eagleton */
+			default:
+				break;
+			}
+		}
 	}
 
 	/*	printf("ID: %u - Extid: 0x%x - Caps: 0x%llx\n",
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index 048f065925c9..9125a551ac1d 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h
@@ -52,10 +52,12 @@ extern int be_verbose;
 enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL,
 			  X86_VENDOR_AMD, X86_VENDOR_MAX};
 
-#define CPUPOWER_CAP_INV_TSC	0x00000001
-#define CPUPOWER_CAP_APERF	0x00000002
-#define CPUPOWER_CAP_AMD_CBP	0x00000004
-#define CPUPOWER_CAP_PERF_BIAS	0x00000008
+#define CPUPOWER_CAP_INV_TSC		0x00000001
+#define CPUPOWER_CAP_APERF		0x00000002
+#define CPUPOWER_CAP_AMD_CBP		0x00000004
+#define CPUPOWER_CAP_PERF_BIAS		0x00000008
+#define CPUPOWER_CAP_HAS_TURBO_RATIO	0x00000010
+#define CPUPOWER_CAP_IS_SNB		0x00000011
 
 #define MAX_HW_PSTATES 10
 
@@ -111,6 +113,7 @@ extern int write_msr(int cpu, unsigned int idx, unsigned long long val);
 
 extern int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val);
 extern int msr_intel_get_perf_bias(unsigned int cpu);
+extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
 
 extern int msr_intel_has_boost_support(unsigned int cpu);
 extern int msr_intel_boost_is_active(unsigned int cpu);
@@ -157,6 +160,8 @@ static inline int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val)
 { return -1; };
 static inline int msr_intel_get_perf_bias(unsigned int cpu)
 { return -1; };
+static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
+{ return 0; };
 
 static inline int msr_intel_has_boost_support(unsigned int cpu)
 { return -1; };
diff --git a/tools/power/cpupower/utils/helpers/msr.c b/tools/power/cpupower/utils/helpers/msr.c
index 93d48bd56e57..7869ca64dfd3 100644
--- a/tools/power/cpupower/utils/helpers/msr.c
+++ b/tools/power/cpupower/utils/helpers/msr.c
@@ -11,6 +11,7 @@
 #define MSR_IA32_PERF_STATUS		0x198
 #define MSR_IA32_MISC_ENABLES		0x1a0
 #define MSR_IA32_ENERGY_PERF_BIAS	0x1b0
+#define MSR_NEHALEM_TURBO_RATIO_LIMIT	0x1ad
 
 /*
  * read_msr
@@ -79,6 +80,7 @@ int msr_intel_has_boost_support(unsigned int cpu)
 	ret = read_msr(cpu, MSR_IA32_MISC_ENABLES, &misc_enables);
 	if (ret)
 		return ret;
+
 	return (misc_enables >> 38) & 0x1;
 }
 
@@ -119,4 +121,18 @@ int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val)
 		return ret;
 	return 0;
 }
+
+unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
+{
+	unsigned long long val;
+	int ret;
+
+	if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_HAS_TURBO_RATIO))
+		return -1;
+
+	ret = read_msr(cpu, MSR_NEHALEM_TURBO_RATIO_LIMIT, &val);
+	if (ret)
+		return ret;
+	return val;
+}
 #endif