diff options
| author | Keir Fraser <keir.fraser@citrix.com> | 2010-04-09 08:52:43 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2010-04-09 08:52:43 +0100 |
| commit | 002c5bcdbe112c70718ebc81ba95290210fa7f0d (patch) | |
| tree | 79b6f996ecc5d1dd2d5f847acdf4525e4be768e2 /xen/arch/x86/acpi/cpufreq/cpufreq.c | |
| parent | e136054cedf0b8d9395d35b8d3e5334eb514c47d (diff) | |
Refactor Xen Support for Intel Turbo Boost
Refactor the existing code that supports the Intel Turbo feature to
move all the driver specific bits in the cpufreq driver. Create
a tri-state interface for the Turbo feature that can distinguish
amongst enabled Turbo, disabled Turbo, and processors that don't
support Turbo at all.
Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
Diffstat (limited to 'xen/arch/x86/acpi/cpufreq/cpufreq.c')
| -rw-r--r-- | xen/arch/x86/acpi/cpufreq/cpufreq.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/xen/arch/x86/acpi/cpufreq/cpufreq.c b/xen/arch/x86/acpi/cpufreq/cpufreq.c index 791cccd0d9..17776b4735 100644 --- a/xen/arch/x86/acpi/cpufreq/cpufreq.c +++ b/xen/arch/x86/acpi/cpufreq/cpufreq.c @@ -410,6 +410,10 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy, return -ENODEV; } + if (policy->turbo == CPUFREQ_TURBO_DISABLED) + if (target_freq > policy->cpuinfo.second_max_freq) + target_freq = policy->cpuinfo.second_max_freq; + perf = data->acpi_data; result = cpufreq_frequency_table_target(policy, data->freq_table, @@ -610,12 +614,19 @@ acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) break; } - /* Check for APERF/MPERF support in hardware */ + /* Check for APERF/MPERF support in hardware + * also check for boost support */ if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { unsigned int ecx; + unsigned int eax; ecx = cpuid_ecx(6); if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) acpi_cpufreq_driver.getavg = get_measured_perf; + eax = cpuid_eax(6); + if ( eax & 0x2 ) { + policy->turbo = CPUFREQ_TURBO_ENABLED; + printk(XENLOG_INFO "Turbo Mode detected and enabled!\n"); + } } /* |