From patchwork Thu Oct 24 10:19:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 13848720 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 6BC83CFA478 for ; Thu, 24 Oct 2024 10:20:53 +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:References:In-Reply-To: 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: List-Owner; bh=SQrM0Qz3t2Fxn8iV5v5hVUJn0EmAFuS9amsGtPiJNoo=; b=CJma8FYk3b2Dv5 4OOpWwVVbD+C2/IqNFVhmVglXXAttrwmRQwaCrJFBSupplKupuwQevL2AKi6QwWbFWpryyGv3+QrA fDhoPwww5dPTfpwINDavWWuGKyYqxRZD2dC9/mQ3MqxLlUd7D7JEn5Q8t8V2/wRyUmlWZVzcJZ3yN h5xQGhTzSuMmTILt54OG66/RimphiCIR4DdBzGKdFpthP69qkNU2437vgnsNPNm9m9wAzMuDP4qSq r40fBWORDGF3tOV0Rk8AYSY3fK2AcqetfqQvD+bcpmeEM6Dwa/sCdt7CpPXFwBmeXOktSKSMaEOMZ uBLIZl27QxGFd71vQ8Xg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3uxU-000000002sA-1sQ1; Thu, 24 Oct 2024 10:20:48 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3uwl-000000002fK-05DT for linux-riscv@lists.infradead.org; Thu, 24 Oct 2024 10:20:04 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id E7C86A4532E; Thu, 24 Oct 2024 10:19:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4DB15C4CEE6; Thu, 24 Oct 2024 10:19:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729765201; bh=t6qXY29CzwvkAmigVfocrRJlQh3OdqhWqzaw1QZS3PI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mglViwfR08zIxTBNHSBGANTzSzSLOklLiFt+ib2SyPLimzW/akAflTjOMstZ24hX7 xqAgDMPdXQcmGDl8jraoSE1vt7Q12TQauI7H5HHCfZhil0T338Vd0OLOVspku+cdi3 mEcJWCtNYg1JAuojw3SDJSezseLtcwzUxZ0/3vzZkEwhYwSyXVLbw7ko4EQdRIFrBV Q3sHtRLkYFnhfNbzQxYy0bZbyoosEJuod0NsgGYz3PLEYE3ieIK04up/wUcskcXmGD g3yVMcAUOWYF3zrMfpNSUeSB1hOM0rzKkLF2zHIt+e5ZZuk1bdT7V68syqMZPehhxI ZNCozRMwswWuw== From: Conor Dooley To: linux-riscv@lists.infradead.org Cc: conor@kernel.org, Conor Dooley , xiao.w.wang@intel.com, Andrew Jones , pulehui@huawei.com, Charlie Jenkins , Paul Walmsley , Palmer Dabbelt , linux-kernel@vger.kernel.org, Samuel Holland , Pu Lehui , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= Subject: [PATCH v4 1/2] RISC-V: clarify what some RISCV_ISA* config options do Date: Thu, 24 Oct 2024 11:19:40 +0100 Message-ID: <20241024-overdue-slogan-0b0f69d3da91@spud> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241024-aspire-rectify-9982da6943e5@spud> References: <20241024-aspire-rectify-9982da6943e5@spud> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4816; i=conor.dooley@microchip.com; h=from:subject:message-id; bh=3yJLValW/VoFMfVO6YI87JTMWn+8zsqnfBmwuqlkS34=; b=owGbwMvMwCFWscWwfUFT0iXG02pJDOlS8vaz7gQ+u150x9Rz57YzdVwPp65L8It0ba9scrcr7 7EN+z+vo5SFQYyDQVZMkSXxdl+L1Po/Ljuce97CzGFlAhnCwMUpABOZe4vhr0Rsw8+MR4qlS38k hHzYtmnnhvAfxQWn38yR3NzP2Kjt9p6RYeOh/985Xu+60p+XsHRGh6D2dOmSR7e71ljYcIgvnbp /FS8A X-Developer-Key: i=conor.dooley@microchip.com; a=openpgp; fpr=F9ECA03CF54F12CD01F1655722E2C55B37CF380C X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241024_032003_223277_CE67007A X-CRM114-Status: GOOD ( 18.25 ) 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: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Conor Dooley During some discussion on IRC yesterday and on Pu's bpf patch [1] I noticed that these RISCV_ISA* Kconfig options are not really clear about their implications. Many of these options have no impact on what userspace is allowed to do, for example an application can use Zbb regardless of whether or not the kernel does. Change the help text to try and clarify whether or not an option affects just the kernel, or also userspace. None of these options actually control whether or not an extension is detected dynamically as that's done regardless of Kconfig options, so drop any text that implies the option is required for dynamic detection, rewording them as "do x when y is detected". Link: https://lore.kernel.org/linux-riscv/20240328-ferocity-repose-c554f75a676c@spud/ [1] Reviewed-by: Andrew Jones Signed-off-by: Conor Dooley --- arch/riscv/Kconfig | 36 +++++++++++++++++++----------------- 1 file changed, 19 insertions(+), 17 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 62545946ecf43..278a38c94c5a6 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -527,7 +527,8 @@ config RISCV_ISA_C help Adds "C" to the ISA subsets that the toolchain is allowed to emit when building Linux, which results in compressed instructions in the - Linux binary. + Linux binary. This option produces a kernel that will not run on + systems that do not support compressed instructions. If you don't know what to do here, say Y. @@ -537,8 +538,8 @@ config RISCV_ISA_SVNAPOT depends on RISCV_ALTERNATIVE default y help - Allow kernel to detect the Svnapot ISA-extension dynamically at boot - time and enable its usage. + Enable support for the Svnapot ISA-extension when it is detected + at boot. The Svnapot extension is used to mark contiguous PTEs as a range of contiguous virtual-to-physical translations for a naturally @@ -556,9 +557,8 @@ config RISCV_ISA_SVPBMT depends on RISCV_ALTERNATIVE default y help - Adds support to dynamically detect the presence of the Svpbmt - ISA-extension (Supervisor-mode: page-based memory types) and - enable its usage. + Add support for the Svpbmt ISA-extension (Supervisor-mode: + page-based memory types) in the kernel when it is detected at boot. The memory type for a page contains a combination of attributes that indicate the cacheability, idempotency, and ordering @@ -577,14 +577,15 @@ config TOOLCHAIN_HAS_V depends on AS_HAS_OPTION_ARCH config RISCV_ISA_V - bool "VECTOR extension support" + bool "Vector extension support" depends on TOOLCHAIN_HAS_V depends on FPU select DYNAMIC_SIGFRAME default y help - Say N here if you want to disable all vector related procedure - in the kernel. + Add support for the Vector extension when it is detected at boot. + When this option is disabled, neither the kernel nor userspace may + use vector procedures. If you don't know what to do here, say Y. @@ -667,8 +668,8 @@ config RISCV_ISA_ZBB depends on RISCV_ALTERNATIVE default y help - Adds support to dynamically detect the presence of the ZBB - extension (basic bit manipulation) and enable its usage. + Add support for enabling optimisations in the kernel when the + Zbb extension is detected at boot. The Zbb extension provides instructions to accelerate a number of bit-specific operations (count bit population, sign extending, @@ -707,9 +708,9 @@ config RISCV_ISA_ZICBOM select RISCV_DMA_NONCOHERENT select DMA_DIRECT_REMAP help - Adds support to dynamically detect the presence of the ZICBOM - extension (Cache Block Management Operations) and enable its - usage. + Add support for the Zicbom extension (Cache Block Management + Operations) and enable its use in the kernel when it is detected + at boot. The Zicbom extension can be used to handle for example non-coherent DMA support on devices that need it. @@ -722,7 +723,7 @@ config RISCV_ISA_ZICBOZ default y help Enable the use of the Zicboz extension (cbo.zero instruction) - when available. + in the kernel when it is detected at boot. The Zicboz extension is used for faster zeroing of memory. @@ -760,8 +761,9 @@ config FPU bool "FPU support" default y help - Say N here if you want to disable all floating-point related procedure - in the kernel. + Add support for floating point operations when an FPU is detected at + boot. When this option is disabled, neither the kernel nor userspace + may use the floating point unit. If you don't know what to do here, say Y.