From patchwork Fri Mar 11 22:14:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas Pandruvada X-Patchwork-Id: 550696 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF1AEC433F5 for ; Fri, 11 Mar 2022 22:44:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229692AbiCKWpm (ORCPT ); Fri, 11 Mar 2022 17:45:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229633AbiCKWph (ORCPT ); Fri, 11 Mar 2022 17:45:37 -0500 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 27AE7148671; Fri, 11 Mar 2022 14:21:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1647037276; x=1678573276; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=aXpYOn6ZRsuTaRkD1g4T1EgJ06+xggd+9isCrVZMGXo=; b=jCTUM9rslUpRnz45xGT2RwDUDP2tWm08aBSkI43AnadT+f/cs7bj+kin lZqpAolIykE9Q8A24aUuRK9WUPzQAWTbta+kbJX5z9u+nqJHqX5ng5d/6 qhbzOSLDgmSpD9DTvlFdhlhEh0M/+WIHDxgEutJCkyGVCp2Vkc9tMXUJK Plr9npeesT798LIY44r8vnSjW2PKmaotEwDdjjI0UnGPW5we9HXLmxB/t IG71vcLUjcWrC+0u9wgw4b3ddjQBqisseijRRQ+ipOEH5S1TISwJPGGi7 C5Zb4NaDGG/4mviq1wTD/LLhAyYhPReVgiKnW0oIGtF/LTJwIneJ2iKkf Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10283"; a="255853491" X-IronPort-AV: E=Sophos;i="5.90,174,1643702400"; d="scan'208";a="255853491" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Mar 2022 14:14:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,174,1643702400"; d="scan'208";a="496896178" Received: from spandruv-desk.jf.intel.com ([10.54.75.8]) by orsmga003.jf.intel.com with ESMTP; 11 Mar 2022 14:14:14 -0800 From: Srinivas Pandruvada To: rafael@kernel.org, daniel.lezcano@linaro.org, corbet@lwn.net Cc: linux-pm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Srinivas Pandruvada Subject: [PATCH] documentation: thermal: DPTF Documentation Date: Fri, 11 Mar 2022 14:14:13 -0800 Message-Id: <20220311221413.714859-1-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Document Intel Dynamic Platform and Thermal Framework (DPTF) ABI. Signed-off-by: Srinivas Pandruvada --- 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 + +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//uuids`, where +=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//`, where +=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