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cpupower: Do detect IDA (opportunistic processor performance) via cpuid

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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>
This commit is contained in:
Thomas Renninger 2011-07-21 11:54:54 +02:00 committed by Dominik Brodowski
parent 8fb2e440b2
commit 029e9f7366
4 changed files with 9 additions and 41 deletions
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6
tools/power/cpupower/utils/helpers/cpuid.c
View file

@ -130,6 +130,12 @@ int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info)
cpu_info->caps |= CPUPOWER_CAP_AMD_CBP;
}
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)))

9
tools/power/cpupower/utils/helpers/helpers.h
View 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,

12
tools/power/cpupower/utils/helpers/misc.c
View 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__) */

23
tools/power/cpupower/utils/helpers/msr.c
View 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;