cpupower: Show Intel turbo ratio support via ./cpupower frequency-info

This adds the last piece missing from turbostat (if called with -v).
It shows on Intel machines supporting Turbo Boost how many cores
have to be active/idle to enter which boost mode (frequency).

Whether the HW really enters these boost modes can be verified via
./cpupower monitor.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: lenb@kernel.org
CC: linux@dominikbrodowski.net
CC: cpufreq@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

4 files changed, 95 insertions, 17 deletions

diff --git a/tools/power/cpupower/utils/cpufreq-info.c b/tools/power/cpupower/utils/cpufreq-info.c
index 8628644188c..5a1d25f056b 100644
--- a/tools/power/cpupower/utils/cpufreq-info.c
+++ b/tools/power/cpupower/utils/cpufreq-info.c
@@ -165,26 +165,56 @@ static int get_boost_mode(unsigned int cpu)
 	printf(_("    Supported: %s\n"), support ? _("yes") : _("no"));
 	printf(_("    Active: %s\n"), active ? _("yes") : _("no"));
 
-	/* ToDo: Only works for AMD for now... */
-
 	if (cpupower_cpu_info.vendor == X86_VENDOR_AMD &&
 	    cpupower_cpu_info.family >= 0x10) {
 		ret = decode_pstates(cpu, cpupower_cpu_info.family, b_states,
 				     pstates, &pstate_no);
 		if (ret)
 			return ret;
-	} else
-		return 0;
 
-	printf(_("    Boost States: %d\n"), b_states);
-	printf(_("    Total States: %d\n"), pstate_no);
-	for (i = 0; i < pstate_no; i++) {
-		if (i < b_states)
-			printf(_("    Pstate-Pb%d: %luMHz (boost state)\n"),
-			       i, pstates[i]);
+		printf(_("    Boost States: %d\n"), b_states);
+		printf(_("    Total States: %d\n"), pstate_no);
+		for (i = 0; i < pstate_no; i++) {
+			if (i < b_states)
+				printf(_("    Pstate-Pb%d: %luMHz (boost state)"
+					 "\n"), i, pstates[i]);
+			else
+				printf(_("    Pstate-P%d:  %luMHz\n"),
+				       i - b_states, pstates[i]);
+		}
+	} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_HAS_TURBO_RATIO) {
+		double bclk;
+		unsigned long long intel_turbo_ratio = 0;
+		unsigned int ratio;
+
+		/* Any way to autodetect this ? */
+		if (cpupower_cpu_info.caps & CPUPOWER_CAP_IS_SNB)
+			bclk = 100.00;
 		else
-			printf(_("    Pstate-P%d:  %luMHz\n"),
-			       i - b_states, pstates[i]);
+			bclk = 133.33;
+		intel_turbo_ratio = msr_intel_get_turbo_ratio(cpu);
+		dprint ("    Ratio: 0x%llx - bclk: %f\n",
+			intel_turbo_ratio, bclk);
+
+		ratio = (intel_turbo_ratio >> 24) & 0xFF;
+		if (ratio)
+			printf(_("    %.0f MHz max turbo 4 active cores\n"),
+			       ratio * bclk);
+
+		ratio = (intel_turbo_ratio >> 16) & 0xFF;
+		if (ratio)
+			printf(_("    %.0f MHz max turbo 3 active cores\n"),
+			       ratio * bclk);
+
+		ratio = (intel_turbo_ratio >> 8) & 0xFF;
+		if (ratio)
+			printf(_("    %.0f MHz max turbo 2 active cores\n"),
+			       ratio * bclk);
+
+		ratio = (intel_turbo_ratio >> 0) & 0xFF;
+		if (ratio)
+			printf(_("    %.0f MHz max turbo 1 active cores\n"),
+			       ratio * bclk);
 	}
 	return 0;
 }
diff --git a/tools/power/cpupower/utils/helpers/cpuid.c b/tools/power/cpupower/utils/helpers/cpuid.c
index 944b2c1659d..a97f091fcf2 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 048f065925c..9125a551ac1 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 93d48bd56e5..7869ca64dfd 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