cpupower: Do detect IDA (opportunistic processor performance) via cpuid
Thomas Renninger [Thu, 21 Jul 2011 09:54:54 +0000 (11:54 +0200)]
IA32-Intel Devel guide Volume 3A - 14.3.2.1
-------------------------------------------
...
Opportunistic processor performance operation can be disabled by setting bit 38 of
IA32_MISC_ENABLES. This mechanism is intended for BIOS only. If
IA32_MISC_ENABLES[38] is set, CPUID.06H:EAX[1] will return 0.

Better detect things via cpuid, this cleans up the code a bit
and the MSR parts were not working correctly anyway.

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>

tools/power/cpupower/utils/helpers/cpuid.c
tools/power/cpupower/utils/helpers/helpers.h
tools/power/cpupower/utils/helpers/misc.c
tools/power/cpupower/utils/helpers/msr.c

index a97f091..906895d 100644 (file)
@@ -131,6 +131,12 @@ out:
        }
 
        if (cpu_info->vendor == X86_VENDOR_INTEL) {
+               if (cpuid_level >= 6 &&
+                   (cpuid_eax(6) & (1 << 1)))
+                       cpu_info->caps |= CPUPOWER_CAP_INTEL_IDA;
+       }
+
+       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;
index 9125a55..592ee36 100644 (file)
@@ -58,6 +58,7 @@ enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL,
 #define CPUPOWER_CAP_PERF_BIAS         0x00000008
 #define CPUPOWER_CAP_HAS_TURBO_RATIO   0x00000010
 #define CPUPOWER_CAP_IS_SNB            0x00000011
+#define CPUPOWER_CAP_INTEL_IDA         0x00000012
 
 #define MAX_HW_PSTATES 10
 
@@ -115,9 +116,6 @@ 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);
-
 /* Read/Write msr ****************************/
 
 /* PCI stuff ****************************/
@@ -163,11 +161,6 @@ static inline int msr_intel_get_perf_bias(unsigned int cpu)
 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; };
-static inline int msr_intel_boost_is_active(unsigned int cpu)
-{ return -1; };
-
 /* Read/Write msr ****************************/
 
 static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,
index e8b3140..1609243 100644 (file)
@@ -20,16 +20,8 @@ int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
                if (ret <= 0)
                        return ret;
                *support = 1;
-       } else if (cpupower_cpu_info.vendor == X86_VENDOR_INTEL) {
-               ret = msr_intel_has_boost_support(cpu);
-               if (ret <= 0)
-                       return ret;
-               *support = ret;
-               ret = msr_intel_boost_is_active(cpu);
-               if (ret <= 0)
-                       return ret;
-               *active = ret;
-       }
+       } else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
+               *support = *active = 1;
        return 0;
 }
 #endif /* #if defined(__i386__) || defined(__x86_64__) */
index 7869ca6..31a4b24 100644 (file)
@@ -72,29 +72,6 @@ int write_msr(int cpu, unsigned int idx, unsigned long long val)
        return -1;
 }
 
-int msr_intel_has_boost_support(unsigned int cpu)
-{
-       unsigned long long misc_enables;
-       int ret;
-
-       ret = read_msr(cpu, MSR_IA32_MISC_ENABLES, &misc_enables);
-       if (ret)
-               return ret;
-
-       return (misc_enables >> 38) & 0x1;
-}
-
-int msr_intel_boost_is_active(unsigned int cpu)
-{
-       unsigned long long perf_status;
-       int ret;
-
-       ret = read_msr(cpu, MSR_IA32_PERF_STATUS, &perf_status);
-       if (ret)
-               return ret;
-       return (perf_status >> 32) & 0x1;
-}
-
 int msr_intel_get_perf_bias(unsigned int cpu)
 {
        unsigned long long val;