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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ds12-20020a17090b08cc00b00230aa06e06dsi5847215pjb.105.2023.02.06.12.20.05; Mon, 06 Feb 2023 12:20:18 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@rivosinc-com.20210112.gappssmtp.com header.s=20210112 header.b=LJTUsmkj; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229899AbjBFUPw (ORCPT + 99 others); Mon, 6 Feb 2023 15:15:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230073AbjBFUPt (ORCPT ); Mon, 6 Feb 2023 15:15:49 -0500 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2A0D2914A for ; Mon, 6 Feb 2023 12:15:34 -0800 (PST) Received: by mail-pj1-x102f.google.com with SMTP id pj3so12735794pjb.1 for ; Mon, 06 Feb 2023 12:15:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ggzc1GTHoLiBAu4kfMHEm/fbizYyfDbBZlVMBkPr/K4=; b=LJTUsmkjEjxAWc1IoFf2wxj/67dVsvTcPqb/jJBjxsyqYyVz3ScQAmEmLk7rLdnoH2 0G+w1w7rUgLxoJG6JGeK3oBnyoikVbeT2iqgsNILC3XuFyOKGDcmP6bbCSZGhfVOECgU 3sXnzYhBeGAERqormKcypgWG9XWhAAPUpOh4F6QyBmnObP3SI24BGHjffKmGOd2C6h6M nFlREjaXPwWSA4WBnjQF1PYXsDM8gl0fe+zFGdgbvHUSF0tQ9pj4/mXQRf2gDg9e6iTA ZA4SYFH9Hgm45V+ECqXetPqrjaeYznz677JdCHLdnP+AJ8p2xJmxcea26IMGvNKEjbXU 86dw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ggzc1GTHoLiBAu4kfMHEm/fbizYyfDbBZlVMBkPr/K4=; b=GO2f0VEHvVsLedhyhaQ3txBXR9dUub4RVhtee4NHdKkDAlAF0DpTOAhxpcPN10cdYB kgm6uJ7niqnB6a1dVskltEbWAstCGb8fUduXgz94gxaLNUm6nyyL+ji3mSMOoWQWyhOS yTLwHu7AGeEOSKRackZ09uQSc2dd71qnK8MC0fUvPUt1ai74QWLtHSb57P1jSnByEYR+ 5gvIvqpw23liwtnLVosObMF8rSErQy51s1WBn7EscaSvhwOPyfdzjDBKuVh7O0GaXn1I jnWs2wqgT6y4scOCugr1T7T8Ko2gVnf94TJ4skgQ1vKZ06kkIpTUKklV/QDkMuQUDfK+ Owzw== X-Gm-Message-State: AO0yUKXxsUCZMy/R7OCTWHv+7xF0f9ebn4P7EmWLSgctVY3sYA24wkF4 PNGIY/CAp7ylRP+T5pNygN33Qw== X-Received: by 2002:a17:90a:54:b0:230:acb2:e3f0 with SMTP id 20-20020a17090a005400b00230acb2e3f0mr840256pjb.33.1675714534354; Mon, 06 Feb 2023 12:15:34 -0800 (PST) Received: from evan.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id k10-20020a63ab4a000000b004df4fbb9823sm6425079pgp.68.2023.02.06.12.15.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Feb 2023 12:15:33 -0800 (PST) From: Evan Green To: Palmer Dabbelt Cc: Conor Dooley , vineetg@rivosinc.com, heiko@sntech.de, slewis@rivosinc.com, Evan Green , Albert Ou , Krzysztof Kozlowski , Palmer Dabbelt , Paul Walmsley , Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH v2 4/6] dt-bindings: Add RISC-V misaligned access performance Date: Mon, 6 Feb 2023 12:14:53 -0800 Message-Id: <20230206201455.1790329-5-evan@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230206201455.1790329-1-evan@rivosinc.com> References: <20230206201455.1790329-1-evan@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757114341317720923?= X-GMAIL-MSGID: =?utf-8?q?1757114341317720923?= From: Palmer Dabbelt This key allows device trees to specify the performance of misaligned accesses to main memory regions from each CPU in the system. Signed-off-by: Palmer Dabbelt Signed-off-by: Evan Green --- (no changes since v1) Documentation/devicetree/bindings/riscv/cpus.yaml | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml index c6720764e765..2c09bd6f2927 100644 --- a/Documentation/devicetree/bindings/riscv/cpus.yaml +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml @@ -85,6 +85,21 @@ properties: $ref: "/schemas/types.yaml#/definitions/string" pattern: ^rv(?:64|32)imaf?d?q?c?b?v?k?h?(?:_[hsxz](?:[a-z])+)*$ + riscv,misaligned-access-performance: + description: + Identifies the performance of misaligned memory accesses to main memory + regions. There are three flavors of unaligned access performance: "emulated" + means that misaligned accesses are emulated via software and thus + extremely slow, "slow" means that misaligned accesses are supported by + hardware but still slower that aligned accesses sequences, and "fast" + means that misaligned accesses are as fast or faster than the + cooresponding aligned accesses sequences. + $ref: "/schemas/types.yaml#/definitions/string" + enum: + - emulated + - slow + - fast + # RISC-V requires 'timebase-frequency' in /cpus, so disallow it here timebase-frequency: false