Document Intel Dynamic Platform and Thermal Framework (DPTF)
ABI.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
---
Documentation/driver-api/thermal/index.rst | 1 +
.../driver-api/thermal/intel_dptf.rst | 272 ++++++++++++++++++
2 files changed, 273 insertions(+)
create mode 100644 Documentation/driver-api/thermal/intel_dptf.rst
diff --git a/Documentation/driver-api/thermal/index.rst b/Documentation/driver-api/thermal/index.rst
index 4cb0b9b6bfb8..030306ffa408 100644
--- a/Documentation/driver-api/thermal/index.rst
+++ b/Documentation/driver-api/thermal/index.rst
@@ -17,3 +17,4 @@ Thermal
intel_powerclamp
nouveau_thermal
x86_pkg_temperature_thermal
+ intel_dptf
diff --git a/Documentation/driver-api/thermal/intel_dptf.rst b/Documentation/driver-api/thermal/intel_dptf.rst
new file mode 100644
index 000000000000..96668dca753a
--- /dev/null
+++ b/Documentation/driver-api/thermal/intel_dptf.rst
@@ -0,0 +1,272 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================================================
+Intel(R) Dynamic Platform and Thermal Framework Sysfs Interface
+===============================================================
+
+:Copyright: |copy| 2022 Intel Corporation
+
+:Author: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
+
+Introduction
+------------
+
+Intel(R) Dynamic Platform and Thermal Framework (DPTF) is a platform
+level hardware/software solution for power and thermal management.
+
+As a container for multiple power/thermal technologies, DPTF provides
+a coordinated approach for different policies to effect the hardware
+state of a system.
+
+Since it is a platform level framework, this has several components.
+Some parts of the technology is implemented in the firmware and uses
+ACPI and PCI devices to expose various features for monitoring and
+control. Linux has a set of kernel drivers exposing hardware interface
+to user space. This allows user space thermal solutions like
+"Linux Thermal Daemon" to read platform specific thermal and power
+tables to deliver adequate performance while keeping the system under
+thermal limits.
+
+DPTF ACPI Drivers interface
+----------------------------
+
+:file:`/sys/bus/platform/devices/<N>/uuids`, where <N>
+=INT3400|INTC1040|INTC1041|INTC10A0
+
+``available_uuids`` (RO)
+ A set of UUIDs strings presenting available policies
+ which should be notified to the firmware when the
+ user space can support those policies.
+
+ UUID strings:
+
+ "42A441D6-AE6A-462b-A84B-4A8CE79027D3" : Passive 1
+
+ "3A95C389-E4B8-4629-A526-C52C88626BAE" : Active
+
+ "97C68AE7-15FA-499c-B8C9-5DA81D606E0A" : Critical
+
+ "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D" : Adaptive performance
+
+ "5349962F-71E6-431D-9AE8-0A635B710AEE" : Emergency call
+
+ "9E04115A-AE87-4D1C-9500-0F3E340BFE75" : Passive 2
+
+ "F5A35014-C209-46A4-993A-EB56DE7530A1" : Power Boss
+
+ "6ED722A7-9240-48A5-B479-31EEF723D7CF" : Virtual Sensor
+
+ "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531" : Cooling mode
+
+ "BE84BABF-C4D4-403D-B495-3128FD44dAC1" : HDC
+
+``current_uuid`` (RW)
+ User space can write strings from available UUIDs, one at a
+ time.
+
+:file:`/sys/bus/platform/devices/<N>/`, where <N>
+=INT3400|INTC1040|INTC1041|INTC10A0
+
+``imok`` (WO)
+ User space daemon write 1 to respond to firmware event
+ for sending keep alive notification. User space receives
+ THERMAL_EVENT_KEEP_ALIVE kobject uevent notification when
+ firmware calls for user space to respond with imok ACPI
+ method.
+
+``odvp*`` (RO)
+ Firmware thermal status variable values. Thermal tables
+ calls for different processing based on these variable
+ values.
+
+``data_vault`` (RO)
+ Binary thermal table. Refer to
+ https:/github.com/intel/thermal_daemon for decoding
+ thermal table.
+
+
+ACPI Thermal Relationship table interface
+------------------------------------------
+
+:file:`/dev/acpi_thermal_rel`
+
+ This device provides IOCTL interface to read standard ACPI
+ thermal relationship tables via ACPI methods _TRT and _ART.
+ These IOCTLs are defined in
+ drivers/thermal/intel/int340x_thermal/acpi_thermal_rel.h
+
+ IOCTLs:
+
+ ACPI_THERMAL_GET_TRT_LEN: Get length of TRT table
+
+ ACPI_THERMAL_GET_ART_LEN: Get length of ART table
+
+ ACPI_THERMAL_GET_TRT_COUNT: Number of records in TRT table
+
+ ACPI_THERMAL_GET_ART_COUNT: Number of records in ART table
+
+ ACPI_THERMAL_GET_TRT: Read binary TRT table, length to read is
+ provided via argument to ioctl().
+
+ ACPI_THERMAL_GET_ART: Read binary ART table, length to read is
+ provided via argument to ioctl().
+
+DPTF ACPI Sensor drivers
+-------------------------
+
+DPTF Sensor drivers are presented as standard thermal sysfs thermal_zone.
+
+
+DPTF ACPI Cooling drivers
+--------------------------
+
+DPTF cooling drivers are presented as standard thermal sysfs cooling_device.
+
+
+DPTF Processor thermal PCI Driver interface
+--------------------------------------------
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/power_limits/`
+
+Refer to Documentation/power/powercap/powercap.rst for powercap
+ABI.
+
+``power_limit_0_max_uw`` (RO)
+ Maximum powercap sysfs constraint_0_power_limit_uw for Intel RAPL
+
+``power_limit_0_step_uw`` (RO)
+ Power limit increment/decrements for Intel RAPL constraint 0 power limit
+
+``power_limit_0_min_uw`` (RO)
+ Minimum powercap sysfs constraint_0_power_limit_uw for Intel RAPL
+
+``power_limit_0_tmin_us`` (RO)
+ Minimum powercap sysfs constraint_0_time_window_us for Intel RAPL
+
+``power_limit_0_tmax_us`` (RO)
+ Maximum powercap sysfs constraint_0_time_window_us for Intel RAPL
+
+``power_limit_1_max_uw`` (RO)
+ Maximum powercap sysfs constraint_1_power_limit_uw for Intel RAPL
+
+``power_limit_1_step_uw`` (RO)
+ Power limit increment/decrements for Intel RAPL constraint 1 power limit
+
+``power_limit_1_min_uw`` (RO)
+ Minimum powercap sysfs constraint_1_power_limit_uw for Intel RAPL
+
+``power_limit_1_tmin_us`` (RO)
+ Minimum powercap sysfs constraint_1_time_window_us for Intel RAPL
+
+``power_limit_1_tmax_us`` (RO)
+ Maximum powercap sysfs constraint_1_time_window_us for Intel RAPL
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/`
+
+``tcc_offset_degree_celsius`` (RW)
+ TCC offset from the critical temperature where hardware will throttle
+ CPU.
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/workload_request`
+
+``workload_available_types`` (RO)
+ Available workload types. User space can specify one of the workload type
+ it is currently executing via workload_type. For example: idle, bursty,
+ sustained etc.
+
+``workload_type`` (RW)
+ User space can specify any one of the available workload type using
+ this interface.
+
+DPTF Processor thermal RFIM interface
+--------------------------------------------
+
+RFIM interface allows adjustment of FIVR (Fully Integrated Voltage Regulator)
+and DDR (Double Data Rate)frequencies to avoid RF interference with WiFi and 5G.
+
+Switching voltage regulators (VR) generate radiated EMI or RFI at the
+fundamental frequency and its harmonics. Some harmonics may interfere
+with very sensitive wireless receivers such as Wi-Fi and cellular that
+are integrated into host systems like notebook PCs. One of mitigation
+methods is requesting SOC integrated VR (IVR) switching frequency to a
+small % and shift away the switching noise harmonic interference from
+radio channels. OEM or ODMs can use the driver to control SOC IVR
+operation within the range where it does not impact IVR performance.
+
+DRAM devices of DDR IO interface and their power plane can generate EMI
+at the data rates. Similar to IVR control mechanism, Intel offers a
+mechanism by which DDR data rates can be changed if several conditions
+are met: there is strong RFI interference because of DDR; CPU power
+management has no other restriction in changing DDR data rates;
+PC ODMs enable this feature (real time DDR RFI Mitigation referred to as
+DDR-RFIM) for Wi-Fi from BIOS.
+
+
+FIVR attributes
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/fivr/`
+
+``vco_ref_code_lo`` (RW)
+ The VCO reference code is an 11-bit field and controls the FIVR
+ switching frequency. This is the 3-bit LSB field.
+
+``vco_ref_code_hi`` (RW)
+ The VCO reference code is an 11-bit field and controls the FIVR
+ switching frequency. This is the 8-bit MSB field.
+
+``spread_spectrum_pct`` (RW)
+ Set the FIVR spread spectrum clocking percentage
+
+``spread_spectrum_clk_enable`` (RW)
+ Enable/disable of the FIVR spread spectrum clocking feature
+
+``rfi_vco_ref_code`` (RW)
+ This field is a read only status register which reflects the
+ current FIVR switching frequency
+
+``fivr_fffc_rev`` (RW)
+ This field indicated the revision of the FIVR HW.
+
+
+DVFS attributes
+
+:file:`/sys/bus/pci/devices/0000\:00\:04.0/dvfs/`
+
+``rfi_restriction_run_busy`` (RW)
+ Request the restriction of specific DDR data rate and set this
+ value 1. Self reset to 0 after operation.
+
+``rfi_restriction_err_code`` (RW)
+ 0 :Request is accepted, 1:Feature disabled,
+ 2: the request restricts more points than it is allowed
+
+``rfi_restriction_data_rate_Delta`` (RW)
+ Restricted DDR data rate for RFI protection: Lower Limit
+
+``rfi_restriction_data_rate_Base`` (RW)
+ Restricted DDR data rate for RFI protection: Upper Limit
+
+``ddr_data_rate_point_0`` (RO)
+ DDR data rate selection 1st point
+
+``ddr_data_rate_point_1`` (RO)
+ DDR data rate selection 2nd point
+
+``ddr_data_rate_point_2`` (RO)
+ DDR data rate selection 3rd point
+
+``ddr_data_rate_point_3`` (RO)
+ DDR data rate selection 4th point
+
+``rfi_disable (RW)``
+ Disable DDR rate change feature
+
+DPTF Power supply and Battery Interface
+----------------------------------------
+
+Refer to Documentation/ABI/testing/sysfs-platform-dptf
+
+DPTF Fan Control
+----------------------------------------
+
+Refer to Documentation/admin-guide/acpi/fan_performance_states.rst
--
2.31.1
