From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f179.google.com (mail-il1-f179.google.com [209.85.166.179]) (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 5E9572309BE for ; Mon, 18 Aug 2025 14:56:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755528967; cv=none; b=dgSBmw6Ytipoa/ttouwksWfsS272865aUvyHeCH+B0oRZVn9EuN7XxqNJ8pUcc5QK00jlQdGwUXUO6TA1DIwf7f28TJ1xxuEuGy/Q+meqgNPiSH+Xy+awfHbhVlui7EDF9IZ56+MDQDR0d+TFp+ggmVhLFfAvedOCgVc3eUMUR8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755528967; c=relaxed/simple; bh=OoK8EZCVh6shAzfoSOyrqIIYjO/z1iYKrSUGlMsjZxc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=IXlNxE4y4+PmpNDH0ndpWePoiKot/JzXehWUjUMMZj49ZJSNFbmkmb8v6BjGwJj57T16NnX8dfYllxFqLoQNf3y1hd+3qmMCXMzPAtkmwoWBlzKYIOAH0WM0wIa/jyP3l964+whnZb+Pmp5dqSBfSV8V5n3tLtMK1X/ByFObiFE= 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=RQpqI/V9; arc=none smtp.client-ip=209.85.166.179 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="RQpqI/V9" Received: by mail-il1-f179.google.com with SMTP id e9e14a558f8ab-3e66937e452so5855815ab.0 for ; Mon, 18 Aug 2025 07:56:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1755528964; x=1756133764; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=P9CfNSTuc/uF1qHY5WFP24kXO82FfA15GfsdN/C+IOc=; b=RQpqI/V9TnMHG7v2MomdAoIKrZCNnmu6gMri5+Rcw8M9G0T+ExOaXaq9VeLAjyCssR lvwXNxJhJsIQoP9tCn1EMesTxtDQEeqZyhNRqH1sPzgOEkG4HvDwe50yipll/p67KqhF VDvB5z9GomrDNTVcMzfQWIOaE9ojAQo/AlqTff0NuOqyzYNQC3EEPikGAizq/FbXPjxS aWVF/fFqga9QcTq/eXaU692caGFN3xDKmSuDWXKq+6iDlDy4C6wrnnuaQzYjpdneGa3W I8AB3p4aj4VAqVDxFWaPp738jTumOaoo05nk8DaLhDmmsEeL2GIu6vyWCYZLxUuAyY1/ U3WQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755528964; x=1756133764; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=P9CfNSTuc/uF1qHY5WFP24kXO82FfA15GfsdN/C+IOc=; b=IPn/BKuHqymbfnc5R97RP5uN4sLKX5O4odF+VngrAED6c1cbGmoirjsIAnFSCanRpu 5f9ABjTJ4BLODt5yQ6w1cm8eCFdhI6wSOdCoABuyoxkHBI3kxPAN21RTXLu1mUIDrgbz O5k4R+wUD8zka1r59bCxqZo0BiGr/5leFCuDKBaSxqq0KNFYF+sJtsrZQBdPUnS38+qv yfI/5LnsrFgVORMqp9jIzSU9bG0WZdV7LhL71onz/eZ49nLrHNXLI7XkwL4akd8nU5h4 GiRDSQF5X+GY/p+Mfj+jVc9OCg74lX/TwNfB4xeYefOI4i1StbqHEpAOR3O1YjC556As fuOA== X-Forwarded-Encrypted: i=1; AJvYcCWwh0MTguo9jLdqtrkmFW8uHPA97F/OHEUfWijQg8NA2oewTim/j1mDb0DteddYdn7gY7yosdmhm26c270=@vger.kernel.org X-Gm-Message-State: AOJu0Yxac7+yRqQFzptSCer0GNoErI2I8eaRfXMyyRgjc7WR6uoEMHVh o7g7SdgNJmEq8WrmxnnnBgbGkWhtbwpHyK5DEIVP99AIoxA9MYsu3b0HuMYkZy9tz1c= X-Gm-Gg: ASbGncuoyJZSeJqEZu3kNJmgo8zHj7CCDqJcodqHFMOi32zdMLpd7+OqOPpRb0y3LGD eW+d2BLNWiBrxztVn7bnd6O7NW1dE+Y0y1pi3jjDEvshePQvt/ONPv59I/g0mbvifXOZDTb9dTl HcbOG2CFUPMCN/yUhxm0kSY3vu2Rf0FT0TJQa+iKr7yE7QmtG7h0JGE3Bshk3/lL76b9jswB6Ai wnJmXCnEHdG+UxpM19StEM5Ni0YBE/Bk1ZmFhvo+8ujIzIilbFTmb8XEE+liudQIY93expIf95L YE9W6vYsLMzs2Ss1ZOVjQG/VKj2OlG06K1WF9cHxcgdr/UWfmy2AsE8ulpBhmQyThpAHXXskCh0 7ksST+1sbTv3Mq+nvf7+GXUmGrYT5hQ0MLDE= X-Google-Smtp-Source: AGHT+IHKhwEj30JkX2wIaBs2G2ErrpG6q1NBNVHTVwHY/0ZVQYUutUV3YGS8fX1au2IKlXNP3c+x+w== X-Received: by 2002:a05:6e02:18c6:b0:3e5:3d13:5d80 with SMTP id e9e14a558f8ab-3e57e86aa7amr243594735ab.6.1755528964324; Mon, 18 Aug 2025 07:56:04 -0700 (PDT) Received: from localhost ([140.82.166.162]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-50c9477ef56sm2565433173.5.2025.08.18.07.56.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Aug 2025 07:56:03 -0700 (PDT) Date: Mon, 18 Aug 2025 09:56:03 -0500 From: Andrew Jones To: Anup Patel Cc: Sunil V L , "Rafael J . Wysocki" , Palmer Dabbelt , Paul Walmsley , Alexandre Ghiti , Len Brown , Atish Patra , Anup Patel , Will Deacon , Mark Rutland , linux-acpi@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/2] RISC-V: Add common csr_read_num() and csr_write_num() functions Message-ID: <20250818-ba7d5f923321feb836a408db@orel> References: <20250818143600.894385-1-apatel@ventanamicro.com> <20250818143600.894385-3-apatel@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250818143600.894385-3-apatel@ventanamicro.com> On Mon, Aug 18, 2025 at 08:06:00PM +0530, Anup Patel wrote: > In RISC-V, there is no CSR read/write instruction which takes CSR > number via register so add common csr_read_num() and csr_write_num() > functions which allow accessing certain CSRs by passing CSR number > as parameter. These common functions will be first used by the > ACPI CPPC driver and RISC-V PMU driver. > > Signed-off-by: Anup Patel > Reviewed-by: Sunil V L > --- > 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 > Reviewed-by: Andrew Jones