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Wysocki" Cc: Palmer Dabbelt , Paul Walmsley , Alexandre Ghiti , Len Brown , Atish Patra , Andrew Jones , Anup Patel , Will Deacon , Mark Rutland , linux-acpi@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v3 0/1] Common csr_read_num() and csr_write_num() for RISC-V Date: Tue, 14 Oct 2025 18:51:05 +0530 Message-ID: <20251014132106.181155-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some of the RISC-V drivers (such as RISC-V PMU and ACPI CPPC) need to access CSR based on CSR number discovered from somewhere. Add common RISC-V csr_read_num() and csr_write_num() functions under arch/riscv for such drivers. These patches can be found in the riscv_csr_read_num_v3 branch at: https://github.com/avpatel/linux.git Changes since v2: - Rebase on Linux-6.18-rc1 - Added reviewed-by tags Changes since v1: - Make "out_err" mandatory for csr_read_num() and csr_write_num() in PATCH2 as suggested by Sunil and Drew. This also helps further simplify csr_read_num() and csr_write_num(). Anup Patel (1): RISC-V: Add common csr_read_num() and csr_write_num() functions arch/riscv/include/asm/csr.h | 3 + arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/csr.c | 165 +++++++++++++++++++++++++++++++++++ drivers/acpi/riscv/cppc.c | 17 ++-- drivers/perf/riscv_pmu.c | 54 ++---------- 5 files changed, 184 insertions(+), 56 deletions(-) create mode 100644 arch/riscv/kernel/csr.c -- 2.43.0 From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8B268CCD192 for ; Tue, 14 Oct 2025 13:21:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=lWN51ncPysvPPJW64lCh8xir37ewKXxGSsrp0MBF0ds=; b=J5Jnf00RKP7yUf yq1Ck430aFzWj+3CLrU4X7GzzSWYwNMczIW+Bew+vovcXavSH66yBdcckwfKquowuGWjixj7nJ6H9 B/odPkm0ycUjwewsUpAa8vpqiJbE9MqoBqcl8WvO2OhKuu70m/wBHEfzT7NElxOdeg3abGN/KPJxR wE+6Z+axIB/Fk9TQKQc123mpnGsdny9pQYkRPAUydpzj5VvdI7gPojmBV4zSaq07YVKyDzpscGgPL Cy7GMWeurQf7DxJY9XQrVqxI6lAcNO2KIF/ygX7cbXlNT4UtSI4DS0oKZmrtTxrWiUkwk9UiJDiHi gv2uFOeIa6pPnXXob41g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8exv-0000000GSg3-3QFo; Tue, 14 Oct 2025 13:21:23 +0000 Received: from mail-pl1-x62e.google.com ([2607:f8b0:4864:20::62e]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8exs-0000000GSfT-2hQD for linux-riscv@lists.infradead.org; Tue, 14 Oct 2025 13:21:22 +0000 Received: by mail-pl1-x62e.google.com with SMTP id d9443c01a7336-28a5b8b12a1so47850815ad.0 for ; Tue, 14 Oct 2025 06:21:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1760448080; x=1761052880; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=w63d3iN1NxniFWTpRTs5PQTHc3ix0F8ilLg1M56GOwQ=; b=InYtWXsaHrw8EoxgjOR014rV21Mzq4RHBBGsI5UmEJ2wnbEZtUIJMQbNui44h67pMP idKlzHVR/MEyAbQBkqPyAcbVRRr2IUS1HPwWLasLiJbqrQr3VQUS5Qo0tr/ncNeXEgnF l4nlQ8oBO8bvfRD2/giu5F5Y5WbRdMxvj2tt9GObsHboC5wBqkfA3X2/U8XBr8iph9uz hQV4NkHJzFC7pMjVP4ujoyTe6N1wUl6iFASZJb6Fm/2C0siPstXDhgQ6U0VzMKEP+bq0 424DSDJBO4w09dcJGk/Uoo/OlvDe4o5vz5jnp1xU8X5EdXi3fqcKc0sxXDp5CO2D6AzG 8wjw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760448080; x=1761052880; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=w63d3iN1NxniFWTpRTs5PQTHc3ix0F8ilLg1M56GOwQ=; b=jvAlBSTxZEi9pb1GZIOUtukFGizY26ET9vLihBcEus/IyLTc7CidLbizsty7zeaC5r sut+PwOKzmkCSb5xqXTR8bPMlM8hKtdCc/alyz0YTidAnkUkS6eBeRwXMz/tM+QGx0xQ GVcXJPJ0xTqmwKGCkWZdh/fHJh44G1OL4RNz8iCItpkQD3Ww1O5+RlphsT3IFkBs0CnH SwmTpNSYqvYYmysW/FVWeblZiq3Gca785791jd9VbDlEo0SLC4NHZ6cERBOZTXiLyRoI lsqMvKqF7aAxBG4xxHX8t9PGx4fC7FUsnaTHnUY8U207fYaG1uRzbfy2v4pelSWnHH5s wQBg== X-Forwarded-Encrypted: i=1; AJvYcCXiWCm7NOudV4ZJ1Rrnj9dLAPN1IPKqPHXe7UnmFGjOUoy2olE7i19FkL+BTaw2UcnNcSB1fqUk8UiMzg==@lists.infradead.org X-Gm-Message-State: AOJu0Yxcgcr8VnsNv18DIkUWiZqxcG+tWTkqzQxlj9ox4xd6HXpwFdc2 YtUOQ89k+ZGmXymieQRTBzsp/veDjJUEkrhN+ElP2qhRrQO2I8EkxmSIC8J3RvzyqHM= X-Gm-Gg: ASbGncvDBRdJWYdLtSvWXs328M3n7ClUKW5aFPsed5XHpRY48BMadFvv/7BEaYeS2wj OuxG4lWnu+Pwnb9ukINTvGDOvH1OGv01z3sGimuAKOpXO7J1/Cc5ji6zZgABXMMTEshrrdMMhgI Up/GcrtKov/LBsmEw1K5LG6UqiOQHotM+SDmbfAMEQA8bk9HJglW8z6brpWdaes9KrnIQQHn34P xr45odFFZw78zSPU9vAAggkzK3psxqNTvusKqaXeKcSC2xwCsg2UvqxU//N1oePpyt89WoLqGY9 fxJ3ScxOKhAEUIMJzaQ/N0vLWU3R2dd4eX89QqNJc/2aBuq4jwaGW3E7humtsAL5laDnvIgStzi Qq2kFrLBQuwXgQGT3fH5Zofo0mOI6El5S5aMP0ef0Gn1JLcQwYqLIZ1P0V1jukhEViJIiZe7B X-Google-Smtp-Source: AGHT+IF7s3fLFOl9rdJb0wt/YGaCzHyGdkNVTxLw2zcP1cyGfw127m9LZ83PtoZ1nbrWcMLKHR37aA== X-Received: by 2002:a17:902:f64d:b0:26c:e270:6dad with SMTP id d9443c01a7336-2902741e4a0mr268523345ad.60.1760448079692; Tue, 14 Oct 2025 06:21:19 -0700 (PDT) Received: from localhost.localdomain ([122.171.20.65]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29034de6f08sm164387635ad.26.2025.10.14.06.21.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Oct 2025 06:21:19 -0700 (PDT) From: Anup Patel To: Sunil V L , "Rafael J . Wysocki" Cc: Palmer Dabbelt , Paul Walmsley , Alexandre Ghiti , Len Brown , Atish Patra , Andrew Jones , Anup Patel , Will Deacon , Mark Rutland , linux-acpi@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v3 0/1] Common csr_read_num() and csr_write_num() for RISC-V Date: Tue, 14 Oct 2025 18:51:05 +0530 Message-ID: <20251014132106.181155-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251014_062120_686920_EE116CDC X-CRM114-Status: UNSURE ( 9.86 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Some of the RISC-V drivers (such as RISC-V PMU and ACPI CPPC) need to access CSR based on CSR number discovered from somewhere. Add common RISC-V csr_read_num() and csr_write_num() functions under arch/riscv for such drivers. These patches can be found in the riscv_csr_read_num_v3 branch at: https://github.com/avpatel/linux.git Changes since v2: - Rebase on Linux-6.18-rc1 - Added reviewed-by tags Changes since v1: - Make "out_err" mandatory for csr_read_num() and csr_write_num() in PATCH2 as suggested by Sunil and Drew. This also helps further simplify csr_read_num() and csr_write_num(). Anup Patel (1): RISC-V: Add common csr_read_num() and csr_write_num() functions arch/riscv/include/asm/csr.h | 3 + arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/csr.c | 165 +++++++++++++++++++++++++++++++++++ drivers/acpi/riscv/cppc.c | 17 ++-- drivers/perf/riscv_pmu.c | 54 ++---------- 5 files changed, 184 insertions(+), 56 deletions(-) create mode 100644 arch/riscv/kernel/csr.c -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv