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| author | Ricardo Neri <ricardo.neri-calderon@linux.intel.com> | 2022-01-27 22:34:50 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-02-03 21:50:49 +0300 |
| commit | 1cb19cabeb0e187b6c244d0da73d27f7432c40dc (patch) | |
| tree | 675f72966461f648d235c1fb5e1d5a1a61a4d347 /drivers/thermal/intel/Kconfig | |
| parent | 7b8f40b3de75c971a4e5f9308b06deb59118dbac (diff) | |
| download | linux-1cb19cabeb0e187b6c244d0da73d27f7432c40dc.tar.xz | |
thermal: intel: hfi: Minimally initialize the Hardware Feedback Interface
The Intel Hardware Feedback Interface provides guidance to the operating
system about the performance and energy efficiency capabilities of each
CPU in the system. Capabilities are numbers between 0 and 255 where a
higher number represents a higher capability. For each CPU, energy
efficiency and performance are reported as separate capabilities.
Hardware computes these capabilities based on the operating conditions of
the system such as power and thermal limits. These capabilities are shared
with the operating system in a table resident in memory. Each package in
the system has its own HFI instance. Every logical CPU in the package is
represented in the table. More than one logical CPUs may be represented in
a single table entry. When the hardware updates the table, it generates a
package-level thermal interrupt.
The size and format of the HFI table depend on the supported features and
can only be determined at runtime. To minimally initialize the HFI, parse
its features and allocate one instance per package of a data structure with
the necessary parameters to read and navigate a local copy (i.e., owned by
the driver) of individual HFI tables.
A subsequent changeset will provide per-CPU initialization and interrupt
handling.
Reviewed-by: Len Brown <len.brown@intel.com>
Co-developed by: Aubrey Li <aubrey.li@linux.intel.com>
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/thermal/intel/Kconfig')
| -rw-r--r-- | drivers/thermal/intel/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index c83ea5d04a1d..e9d2925227d4 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -99,3 +99,15 @@ config INTEL_MENLOW Intel Menlow platform. If unsure, say N. + +config INTEL_HFI_THERMAL + bool "Intel Hardware Feedback Interface" + depends on CPU_SUP_INTEL + depends on X86_THERMAL_VECTOR + help + Select this option to enable the Hardware Feedback Interface. If + selected, hardware provides guidance to the operating system on + the performance and energy efficiency capabilities of each CPU. + These capabilities may change as a result of changes in the operating + conditions of the system such power and thermal limits. If selected, + the kernel relays updates in CPUs' capabilities to userspace. |