From patchwork Wed Apr 7 13:59:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 416713 Delivered-To: patch@linaro.org Received: by 2002:a02:8562:0:0:0:0:0 with SMTP id g89csp492590jai; Wed, 7 Apr 2021 06:59:29 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzApGEa/7XWtMvXg8nIzmHAyeqBzeAwoyy438wV8E2HoM+hgSxunMVodWtMjpv5iHyIuOU4 X-Received: by 2002:aa7:c7d5:: with SMTP id o21mr4626902eds.166.1617803969504; Wed, 07 Apr 2021 06:59:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1617803969; cv=none; d=google.com; s=arc-20160816; b=FJ2mghPpjrcNUVhDg/YNSUzRd02Z0wpyZpDONoIutaKZWc0pRSdzmK0ZoQezvwdh/4 8yhvupPSj3MTCkHVHl5HSC4ZeA3fiQ1j9VBZ6heL0HdXJ/DH6Z7AOxZub+Nd4E9TtWb4 //hNuYL9vRdUeFwdvPuBi9FN52dWn2o+9pHU/7MEY98LnO2xZrouq/Ty0HEvY9gWvDkB 9YT9yjD86jOzYJzYaPHNjtpfe2OHL10oU0yUwjuuieBBimnMPDYSOG14CD26c7juzVlz oS+uvFdztNJ/jvChuGT2+gEARKORqSWqX7vkUlD6c1TXXfXb4lV4uvKPanx3nv34AJVi dw2Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from; bh=mElU9Hx/JNal7eQRuzonv9G+MHNy/Q0eWoEz2JBSwYY=; b=KpTgckM/cLnpCuogsA2PdA/Pu/tMSh1C84iHIQZU+jxyGrYt3OWym5w+1O4UwoUTE+ 1ags/VxHuQJMEC10N+vyGvfXci7UNlIgDV1yGuF+Adb4LMLJOgf6MKzTEW+LjZ6IFYSp +VMFPK9YaFNjwwAwdhxytZ6KR29zwwUGrOoJ8a9b1AizxJXlvGYzeEPNyZgwznD7/nA+ gw92pL/WID11SsK9VFmwBqmt5sDeVk1+7TkRGcZ8xqrFId5OSp8eyDD/kByLEiTMbADl XS/p5gN1U3STThBlHDBaBSvH35TPUm+fDK88TL4tnfTuk40PAsaXV7sPLEcOEe65Td2d BvIQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id l12si18517126ejn.151.2021.04.07.06.59.29; Wed, 07 Apr 2021 06:59:29 -0700 (PDT) Received-SPF: pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352893AbhDGN7h (ORCPT + 6 others); Wed, 7 Apr 2021 09:59:37 -0400 Received: from foss.arm.com ([217.140.110.172]:57668 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352844AbhDGN7b (ORCPT ); Wed, 7 Apr 2021 09:59:31 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 66F451FB; Wed, 7 Apr 2021 06:59:21 -0700 (PDT) Received: from usa.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 2E8143F792; Wed, 7 Apr 2021 06:59:20 -0700 (PDT) From: Sudeep Holla To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sudeep Holla , Bjorn Andersson , Hector Yuan , Manivannan Sadhasivam , Rob Herring , Viresh Kumar , Rob Herring Subject: [PATCH v3] dt-bindings: dvfs: Add support for generic performance domains Date: Wed, 7 Apr 2021 14:59:13 +0100 Message-Id: <20210407135913.2067694-1-sudeep.holla@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The CLKSCREW attack [0] exposed security vulnerabilities in energy management implementations where untrusted software had direct access to clock and voltage hardware controls. In this attack, the malicious software was able to place the platform into unsafe overclocked or undervolted configurations. Such configurations then enabled the injection of predictable faults to reveal secrets. Many Arm-based systems used to or still use voltage regulator and clock frameworks in the kernel. These frameworks allow callers to independently manipulate frequency and voltage settings. Such implementations can render systems susceptible to this form of attack. Attacks such as CLKSCREW are now being mitigated by not having direct and independent control of clock and voltage in the kernel and moving that control to a trusted entity, such as the SCP firmware or secure world firmware/software which are to perform sanity checking on the requested performance levels, thereby preventing any attempted malicious programming. With the advent of such an abstraction, there is a need to replace the generic clock and regulator bindings used by such devices with a generic performance domains bindings. [0] https://www.usenix.org/conference/usenixsecurity17/technical-sessions/presentation/tang Link: https://lore.kernel.org/r/20201116181356.804590-1-sudeep.holla@arm.com Cc: Rob Herring Acked-by: Viresh Kumar Signed-off-by: Sudeep Holla --- Hi All, Sorry for the delay, I thought I had sent this out last week and it turns out that I had dry-run in my git email command and never removed it. Just noticed now looking for response for this patch on the list to find out that I never sent it out :(. v2[2]->v3: - Dropped required properties - Added non cpu device example - Updated cpu bindings too v1[1]->v2[2]: - Changed to Dual License - Added select: true, enum for #performance-domain-cells and $ref for performance-domain - Changed the example to use real existing compatibles instead of made-up ones [1] https://lore.kernel.org/lkml/20201105173539.1426301-1-sudeep.holla@arm.com [2] https://lore.kernel.org/lkml/20201116181356.804590-1-sudeep.holla@arm.com .../devicetree/bindings/arm/cpus.yaml | 7 ++ .../bindings/dvfs/performance-domain.yaml | 80 +++++++++++++++++++ 2 files changed, 87 insertions(+) create mode 100644 Documentation/devicetree/bindings/dvfs/performance-domain.yaml -- 2.25.1 diff --git a/Documentation/devicetree/bindings/arm/cpus.yaml b/Documentation/devicetree/bindings/arm/cpus.yaml index 26b886b20b27..98590a2982d0 100644 --- a/Documentation/devicetree/bindings/arm/cpus.yaml +++ b/Documentation/devicetree/bindings/arm/cpus.yaml @@ -255,6 +255,13 @@ description: |+ where voltage is in V, frequency is in MHz. + performance-domains: + $ref: '/schemas/types.yaml#/definitions/phandle-array' + description: + List of phandles and performance domain specifiers, as defined by + bindings of the performance domain provider. See also + dvfs/performance-domain.yaml. + power-domains: $ref: '/schemas/types.yaml#/definitions/phandle-array' description: diff --git a/Documentation/devicetree/bindings/dvfs/performance-domain.yaml b/Documentation/devicetree/bindings/dvfs/performance-domain.yaml new file mode 100644 index 000000000000..640e676ed228 --- /dev/null +++ b/Documentation/devicetree/bindings/dvfs/performance-domain.yaml @@ -0,0 +1,80 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/dvfs/performance-domain.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic performance domains + +maintainers: + - Sudeep Holla + +description: |+ + This binding is intended for performance management of groups of devices or + CPUs that run in the same performance domain. Performance domains must not + be confused with power domains. A performance domain is defined by a set + of devices that always have to run at the same performance level. For a given + performance domain, there is a single point of control that affects all the + devices in the domain, making it impossible to set the performance level of + an individual device in the domain independently from other devices in + that domain. For example, a set of CPUs that share a voltage domain, and + have a common frequency control, is said to be in the same performance + domain. + + This device tree binding can be used to bind performance domain consumer + devices with their performance domains provided by performance domain + providers. A performance domain provider can be represented by any node in + the device tree and can provide one or more performance domains. A consumer + node can refer to the provider by a phandle and a set of phandle arguments + (so called performance domain specifiers) of length specified by the + \#performance-domain-cells property in the performance domain provider node. + +select: true + +properties: + "#performance-domain-cells": + description: + Number of cells in a performance domain specifier. Typically 0 for nodes + representing a single performance domain and 1 for nodes providing + multiple performance domains (e.g. performance controllers), but can be + any value as specified by device tree binding documentation of particular + provider. + enum: [ 0, 1 ] + + performance-domains: + $ref: '/schemas/types.yaml#/definitions/phandle-array' + description: + A phandle and performance domain specifier as defined by bindings of the + performance controller/provider specified by phandle. + +additionalProperties: true + +examples: + - | + performance: performance-controller@12340000 { + compatible = "qcom,cpufreq-hw"; + reg = <0x12340000 0x1000>; + #performance-domain-cells = <1>; + }; + + // The node above defines a performance controller that is a performance + // domain provider and expects one cell as its phandle argument. + gpu@2d000000 { + compatible = "arm,mali-t624"; + reg = <0x2d000000 0x10000>; + power-domains = <&power_devpd 2>; + performance-domains = <&performance 4>; + }; + + cpus { + #address-cells = <2>; + #size-cells = <0>; + + cpu@0 { + device_type = "cpu"; + compatible = "arm,cortex-a57"; + reg = <0x0 0x0>; + performance-domains = <&performance 1>; + }; + }; +