PM: Introduce Intel PowerClamp Driver

Intel PowerClamp driver performs synchronized idle injection across
all online CPUs. The goal is to maintain a given package level C-state
ratio.

Compared to other throttling methods already exist in the kernel,
such as ACPI PAD (taking CPUs offline) and clock modulation, this is often
more efficient in terms of performance per watt.

Please refer to Documentation/thermal/intel_powerclamp.txt for more details.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index c31b9e4451a3..faf38c522fa8 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -131,4 +131,14 @@ config DB8500_CPUFREQ_COOLING
           bound cpufreq cooling device turns active to set CPU frequency low to
           cool down the CPU.
 
+config INTEL_POWERCLAMP
+        tristate "Intel PowerClamp idle injection driver"
+        depends on THERMAL
+        depends on X86
+        depends on CPU_SUP_INTEL
+        help
+          Enable this to enable Intel PowerClamp idle injection driver. This
+          enforce idle time which results in more package C-state residency. The
+          user interface is exposed via generic thermal framework.
+
 endif