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 3C136C74A5B for ; Wed, 29 Mar 2023 20:17:19 +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-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date :Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=gO3r/AkNiCXHBrT/G/pcne20AT8qKqlPXoX8LrFjh9A=; b=VKJxvhKzYRef3o5GsyM2jLFS4j SQPNKUZ1l1axlGumqVcZaHMB0GIkAqjFVzzvkCKwO5j2nyK/ZCM5yTbTPmtOezQeDh2cvsRIzh3+h wPcFUyQYtFyunNqXU4V5xhoIqdG69L0ClOFR55Ggi/3j0GUzKdC5/MT4Dvu7EZrs/9ndeFtqpVGTX y081KWrcISSPUC8xMG+3b1df6wAwBDWlPqWMQ3nAPEIQbkt3O0VQRQ0MJSVLVZIy6N82be/zwhkMV pzM6TKvY/cSLBcetsM+xOhfGBtH3PrTv4dOnX4SHhp/+nUlMh/4tyI+SfT8HtT7BZE0M9kQ0I6/rw hxsJwITQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1phcDZ-001kBv-1c; Wed, 29 Mar 2023 20:16:25 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1phcDW-001kBA-1S; Wed, 29 Mar 2023 20:16:23 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0ABA761DEE; Wed, 29 Mar 2023 20:16:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BAEB3C433D2; Wed, 29 Mar 2023 20:16:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1680120980; bh=GQ/BnFe9Q8YTrp9m/Oja+3F+vgOfqDylgmr9jLCscRs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=P5U564E993rrDoh13ZYMd/KR6rZkNdIdAbkwy4AMMyuaZ2UnsINcIgdKLJGQbZT1R zUAUZnpQCzF0TlpEQXZmdxZiDMl23kcqvk8c8s2jxRsSMekf7FDxCi9gR1oX2Da8hi aag+2sE6WG2TyEHXWa4HzYKbVaDqQKSeZs+SUyrFuRdRhxxhHTm9szdrtMzu032YBF pnLWBxLnUyF1yY234OeM4zx5JvWcQ8+nbW2h2BxGSx1xSG/83/MuR/yVSH7mdi1xg2 0jWbdD9E6OkE4eGUQzkyJv6rP5bdfMAHDI8/GyVgtoddbv/rL55kO33CXzMD08MgAw CkixnBQ6Xb9Yw== Date: Wed, 29 Mar 2023 21:16:10 +0100 From: Conor Dooley To: Arnd Bergmann Cc: linux-kernel@vger.kernel.org, Arnd Bergmann , Vineet Gupta , Russell King , Neil Armstrong , Linus Walleij , Catalin Marinas , Will Deacon , Guo Ren , Brian Cain , Geert Uytterhoeven , Michal Simek , Thomas Bogendoerfer , Dinh Nguyen , Stafford Horne , Helge Deller , Michael Ellerman , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Max Filippov , Christoph Hellwig , Robin Murphy , Lad Prabhakar , Conor Dooley , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-oxnas@groups.io, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org Subject: Re: [PATCH 09/21] riscv: dma-mapping: skip invalidation before bidirectional DMA Message-ID: <764e8d2f-ed98-49dc-8fdb-112d59359148@spud> References: <20230327121317.4081816-1-arnd@kernel.org> <20230327121317.4081816-10-arnd@kernel.org> MIME-Version: 1.0 In-Reply-To: <20230327121317.4081816-10-arnd@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230329_131622_586482_53F1E608 X-CRM114-Status: GOOD ( 15.04 ) X-BeenThere: linux-arm-kernel@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: multipart/mixed; boundary="===============4823301224643503999==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============4823301224643503999== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="2LJh6dsRB07q9YeN" Content-Disposition: inline --2LJh6dsRB07q9YeN Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 27, 2023 at 02:13:05PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann >=20 > For a DMA_BIDIRECTIONAL transfer, the caches have to be cleaned > first to let the device see data written by the CPU, and invalidated > after the transfer to let the CPU see data written by the device. >=20 > riscv also invalidates the caches before the transfer, which does > not appear to serve any purpose. Rationale makes sense to me.. Reviewed-by: Conor Dooley Thanks for working on all of this Arnd! --2LJh6dsRB07q9YeN Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCZCScigAKCRB4tDGHoIJi 0jHpAP47kMhf2uxHoGKhD+jHsEYnFgTHptLnAfIJV6N+QeFoOAD/YxG6hd8qhesW 6Tw9EqBEW/4auX2CLsbK7xE8fP5A9wg= =os1C -----END PGP SIGNATURE----- --2LJh6dsRB07q9YeN-- --===============4823301224643503999== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============4823301224643503999==--