diff options
| author | Borislav Petkov <borislav.petkov@amd.com> | 2010-03-31 21:56:42 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-04-09 14:05:43 -0700 |
| commit | 73860c6b2fd159a35637e233d735e36887c266ad (patch) | |
| tree | 74c657fbd87569441ef0f0e0683637ff0de7700f /arch/x86/kernel/cpu/cpufreq/powernow-k8.h | |
| parent | 5958f1d5d722df7a9e5d129676614a8e5219bacd (diff) | |
powernow-k8: Add core performance boost support
Starting with F10h, revE, AMD processors add support for a dynamic
core boosting feature called Core Performance Boost. When a specific
condition is present, a subset of the cores on a system are boosted
beyond their P0 operating frequency to speed up the performance of
single-threaded applications.
In the normal case, the system comes out of reset with core boosting
enabled. This patch adds a sysfs knob with which core boosting can be
switched on or off for benchmarking purposes.
While at it, make the CPB code hotplug-aware so that taking cores
offline wouldn't interfere with boosting the remaining online cores.
Furthermore, add cpu_online_mask hotplug protection as suggested by
Andrew.
Finally, cleanup the driver init codepath and update copyrights.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <1270065406-1814-3-git-send-email-bp@amd64.org>
Reviewed-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/powernow-k8.h')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/powernow-k8.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h index 02ce824073c..df3529b1c02 100644 --- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.h +++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.h @@ -5,7 +5,6 @@ * http://www.gnu.org/licenses/gpl.html */ - enum pstate { HW_PSTATE_INVALID = 0xff, HW_PSTATE_0 = 0, @@ -55,7 +54,6 @@ struct powernow_k8_data { struct cpumask *available_cores; }; - /* processor's cpuid instruction support */ #define CPUID_PROCESSOR_SIGNATURE 1 /* function 1 */ #define CPUID_XFAM 0x0ff00000 /* extended family */ |