diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2020-01-13 10:00:14 -0800 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-01-13 21:02:36 +0200 |
| commit | 49a474c7ba51ce999803c269adbad778495589af (patch) | |
| tree | 3bda1a5ce75ecb3c3400b59860e7830bb474b2e6 /drivers/platform/x86/Kconfig | |
| parent | 26e66a0cf258d413bd64095b0fea6e34f9e46587 (diff) | |
platform/x86: Add support for Uncore frequency control
Some server users set limits on the uncore frequency using MSR 620H, while
running latency sensitive workloads. Here uncore frequency controls
RING/LLC(last-level cache) clocks.
But MSR control is not always possible from the user space, so this driver
provides a sysfs interface to set max and min frequency limits. This MSR
620H is a die scoped in multi-die system or package scoped in non multi-die
systems.
When this driver is loaded, a new directory is created under
/sys/devices/system/cpu.
For example on a two package Skylake server:
$cd /sys/devices/system/cpu/intel_uncore_frequency
$ls
package_00_die_00 package_01_die_00
$ls package_00_die_00
max_freq_khz min_freq_khz initial_max_freq_khz
initial_min_freq_khz
$grep . *
max_freq_khz:2400000
min_freq_khz:1200000
initial_max_freq_khz:2400000
initial_min_freq_khz:1200000
Here, initial_max_freq_khz and initial_min_freq_khz are read only
attributes to show power up or initial values of max and min frequencies
respectively. Other attributes are read-write, so that users can modify.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/platform/x86/Kconfig')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index f7def0aea92a..e60b051be7a1 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1337,6 +1337,17 @@ config PCENGINES_APU2 To compile this driver as a module, choose M here: the module will be called pcengines-apuv2. +config INTEL_UNCORE_FREQ_CONTROL + tristate "Intel Uncore frequency control driver" + depends on X86_64 + help + This driver allows control of uncore frequency limits on + supported server platforms. + Uncore frequency controls RING/LLC (last-level cache) clocks. + + To compile this driver as a module, choose M here: the module + will be called intel-uncore-frequency. + source "drivers/platform/x86/intel_speed_select_if/Kconfig" config SYSTEM76_ACPI |