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[2620:137:e000::1:20]) by mx.google.com with ESMTP id o6-20020a635a06000000b004fb3547c615si17704531pgb.380.2023.02.21.11.11.38; Tue, 21 Feb 2023 11:11:50 -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=5CAoJgBa; 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 S229992AbjBUTKE (ORCPT + 99 others); Tue, 21 Feb 2023 14:10:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230028AbjBUTJt (ORCPT ); Tue, 21 Feb 2023 14:09:49 -0500 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DD862DE66 for ; Tue, 21 Feb 2023 11:09:34 -0800 (PST) Received: by mail-pl1-x62a.google.com with SMTP id s5so6098543plg.0 for ; Tue, 21 Feb 2023 11:09:34 -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=h4Uz8oInxrBVxdaNnCcRWzHNxIOpRGtwNCns0Csq24o=; b=5CAoJgBaxdsOsjJt2ARXvUAXbErBCB8xjhCRl/00BIB0m+EhiyRU3XZSidGXeE83LK +FRtmHOsemIRPQ/ytDa3xi5xQubu32PfYgOv1GgPMlj8GBuwVt+RKxxhFTTWQgWjLJbH yVO3GZ6Dl6SpXYXL2PGhBsRPKRHAhmrU/mwngeMnCLv+FnBGjy3WnIrrSyPN0GYSZyeo jlCTpaCtDtXLMs75oLfPUTbR6nm5b9ZUPk1JPx7ptYDFvYWEZy841oLGvuf8Tn0KoTed qy2eDXvLc8W845c/ngN141rjsv76Zdue6P6r4RixeblK422nJLdTcHMc3EqqMVYNZDZP 9Iwg== 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=h4Uz8oInxrBVxdaNnCcRWzHNxIOpRGtwNCns0Csq24o=; b=Vp34W06GSNyD/zmHwunKPd6cgF35xVGp5J0RhuXxiSG8oMj35VpId/4SOGI7e7/ew6 82NANWvExpj90NvgZh1jVlTl0ygOebY84eJDLFyMC2fMr0t9WUMSsQBZ/+lqsQgdtAbb swSwsqwi9BT9e+hbib/vvAI2x+i5dVk4urVtuyzRVtGOCoduLT/g7g8Qw6iBcpZMQi3q 1+uUHtR/HjTCG22z766oitz1lcRtH9EUmk9g0660viX0UoLr0JE9ffJzGClklpIAnJN0 1U/WZOS/0Yd8iqo3KdGUUAvDNmCCWp3dof+96werth5QHSDFfLRgkIcni4/gDu8SpMMK OYBQ== X-Gm-Message-State: AO0yUKUC584yszrDv7W5rRdQjiGPcQAOcI2Lle1n6EIeAzqS4j+R6pzp SPxyC3ufxFj9EBZonhj9nm00/Q== X-Received: by 2002:a17:902:c407:b0:19b:dbf7:f9d1 with SMTP id k7-20020a170902c40700b0019bdbf7f9d1mr6464689plk.37.1677006573615; Tue, 21 Feb 2023 11:09:33 -0800 (PST) Received: from evan.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id b16-20020a170902b61000b0019602b2c00csm1583863pls.175.2023.02.21.11.09.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Feb 2023 11:09:33 -0800 (PST) From: Evan Green To: Palmer Dabbelt Cc: heiko@sntech.de, Conor Dooley , slewis@rivosinc.com, vineetg@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 v3 4/7] dt-bindings: Add RISC-V misaligned access performance Date: Tue, 21 Feb 2023 11:08:55 -0800 Message-Id: <20230221190858.3159617-5-evan@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230221190858.3159617-1-evan@rivosinc.com> References: <20230221190858.3159617-1-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?1758468989031229219?= X-GMAIL-MSGID: =?utf-8?q?1758468989031229219?= 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 --- Changes in v3: - Added | to description: to make dt-checker happy. 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..f79e9e5c5ee9 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