diff options
| author | Dirk Brandewie <dirk.j.brandewie@intel.com> | 2014-11-06 09:40:47 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-11-12 00:04:38 +0100 |
| commit | 2f86dc4cddcb21290ca099e1dce2a53533c86e0b (patch) | |
| tree | 4f713a464f066752b8f190fafe1d23bc37118d59 /Documentation/kernel-parameters.txt | |
| parent | 77873887729aaddec5cd27203a6ce8c4987733e4 (diff) | |
| download | lwn-2f86dc4cddcb21290ca099e1dce2a53533c86e0b.tar.gz lwn-2f86dc4cddcb21290ca099e1dce2a53533c86e0b.zip | |
intel_pstate: Add support for HWP
Add support of Hardware Managed Performance States (HWP) described in Volume 3
section 14.4 of the SDM.
With HWP enbaled intel_pstate will no longer be responsible for selecting P
states for the processor. intel_pstate will continue to register to
the cpufreq core as the scaling driver for CPUs implementing
HWP. In HWP mode intel_pstate provides three functions reporting
frequency to the cpufreq core, support for the set_policy() interface
from the core and maintaining the intel_pstate sysfs interface in
/sys/devices/system/cpu/intel_pstate. User preferences expressed via
the set_policy() interface or the sysfs interface are forwared to the
CPU via the HWP MSR interface.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 4c81a860cc2b..907a0f119bee 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1446,6 +1446,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. disable Do not enable intel_pstate as the default scaling driver for the supported processors + no_hwp + Do not enable hardware P state control (HWP) + if available. intremap= [X86-64, Intel-IOMMU] on enable Interrupt Remapping (default) |