From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 961192F066A for ; Tue, 14 Oct 2025 13:21:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760448082; cv=none; b=Hoi0MamDzOYIXvC7k6uOLWYbEdCVtDvvfINqp5WrATZkC5V6QQoUo6cJe6Gu6BmTTqaAQLvzHWyf6Drw2AvFnT+jRhjdzS2VM5otOy1SAOv+NN6GnUQTpNk66aOjNKB6k5IsNSxZkNkugDwHETR/+DSESZTPAOE390EDMCrwNk4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760448082; c=relaxed/simple; bh=My5HomZWKvxduE6n3PHRd+8RyM8EUC+3BbmfbP/nP40=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=NJowkmJgADEXoJDu53DIlcHifzlGipBCB9uqhEYOihM6ifcPRG0FfNvJrRvKCX9QmAXk/2RZPWTOkYadHzf3JOdPjww5x5Ij/XZkRp6DD1NJSquTED4BAKxjAo/GRr3bIWdeLUpi+w+MaoUMDzjp7UufCx2fz9JSLPc4Q8lTiJY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ventanamicro.com; spf=pass smtp.mailfrom=ventanamicro.com; dkim=pass (2048-bit key) header.d=ventanamicro.com header.i=@ventanamicro.com header.b=jD0Gd3ds; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ventanamicro.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ventanamicro.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ventanamicro.com header.i=@ventanamicro.com header.b="jD0Gd3ds" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-27eceb38eb1so60989105ad.3 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=vger.kernel.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=jD0Gd3dsc8w3uPt8t0lIGuNFgl/AryVN33W3XgGiYm9gQbueBHMqueMrd42Hq7IqNS Sqc+HMpwQcvwITDubW3Q6Gv5/31vEYid1soSSJfYAjLo9rS4ouyAtwp6UivPakXCeybQ oEssZhbfgYJEHulYeuMb3pMehXbPDC4vglbzH85e9AOZ3el9y4m3fIWYwlf+Bs1dXuZ1 B2mtu8tdIkLLHiKlDIqyAEHfM272FO0FmUHLxK5NR36sdw85+D4a3sIDBmn+f7pHRyF/ RLqGIfUbp/5kWBlOUSps/3hl6FbK4huK/0kyjJqdm5lZdD+nC54xAswiN2O3aXw4ZLQl IqBA== 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=iAKgazP/TFJvn616wqG6BVnqS2XWBpXEeDOqPE3VOJKyhvjIXTpu4nUnE7wRGx+cat cqkYbFL6RmgYOZLBxCIiZTwRQWTS38tcrwZW9jgFI1/ZjjA6SDBBarTZ4M0HptBO6/Ju i9U7Ajr9qQ7VNyOG2AKPIZOLwyl726yOpc19KPJmLEzrtJ/mV0U+0qT62IoCV/okiDxX U46GUWnTG4WwDGxUewnSxRQHhA52VC/2Vja3MzSszPRaPkdigQ0WXoSnToxPPmkBhYGG 8tz+6qipEOpWccbSputwn+1Cer4xTStZSuJyinnTYqYVf7oyz3Cfa9bHloUPz27sLMhI ikLQ== X-Forwarded-Encrypted: i=1; AJvYcCXdrQChtSsvB3KemwCYhfreFqkVzsYv30SZIsChrRjLRnWX78lZzNjK0FFvU8D8uKULQDk7oLB3IkN6cdU=@vger.kernel.org X-Gm-Message-State: AOJu0Yw4OyEUNgS2kS7zI5dvQ1w2CHCtSDCPweylmCGeUGCb5tuabaCT G2JASjcdThF9b70hkm8FDnr0WaFZqnvuvCPH8ZSVAnlh2UL7K2SglKzlO2+G2xaN2XU= X-Gm-Gg: ASbGnctImzX+SP/ShbEdz4TvFRdc1Q3N/mblGFjpxA0I9Cy/qlEpf0MtiTl07DfETRl +UXynq9DsrYX9DA3GvTyeFfa0lkhmw3nHrnY7pCc8rxBL3CZXTv18W1OkI5IFKjtsqXwYaAZ23S HNfSOAJPiDwutUSKGj7h8BW6tSDUl3WipxsPE2Od239ALFyLl9rTN0pN7vw6PyvQ1UgyMxwHsxy mu6cB53xV0t4LolKixKpgM/tNc6nJ863rc6AyZnFeu2HAA5kcJl+Ldg+miXM0+efVseWBUZgd3/ zZYSd09s8YoxWVr2g+WuDNJ34UnMeLu4htxpn6QHyAUUyURS+m4yLZQchU+V+s+eeFVuIYkAPGZ RqyForo3jqJErQH93mekr+5TibfdpJhViYWrO/1uxzLnbZl5BNnYMWC+YttHC3pGHXGLLranC 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 Precedence: bulk X-Mailing-List: linux-kernel@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