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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F40CC4332B for ; Mon, 8 Mar 2021 11:21:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D41A651CF for ; Mon, 8 Mar 2021 11:21:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231852AbhCHLVV (ORCPT ); Mon, 8 Mar 2021 06:21:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:48394 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231784AbhCHLVC (ORCPT ); Mon, 8 Mar 2021 06:21:02 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7BCA0650F2; Mon, 8 Mar 2021 11:21:01 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lJDwY-000JZJ-8b; Mon, 08 Mar 2021 11:20:58 +0000 Date: Mon, 08 Mar 2021 11:20:57 +0000 Message-ID: <87a6rdzyau.wl-maz@kernel.org> From: Marc Zyngier To: Hector Martin Cc: linux-arm-kernel@lists.infradead.org, Rob Herring , Arnd Bergmann , Olof Johansson , Krzysztof Kozlowski , Mark Kettenis , Tony Lindgren , Mohamed Mediouni , Stan Skowronek , Alexander Graf , Will Deacon , Linus Walleij , Mark Rutland , Andy Shevchenko , Greg Kroah-Hartman , Jonathan Corbet , Catalin Marinas , Christoph Hellwig , "David S. Miller" , devicetree@vger.kernel.org, linux-serial@vger.kernel.org, linux-doc@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFT PATCH v3 08/27] asm-generic/io.h: Add a non-posted variant of ioremap() In-Reply-To: <20210304213902.83903-9-marcan@marcan.st> References: <20210304213902.83903-1-marcan@marcan.st> <20210304213902.83903-9-marcan@marcan.st> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: marcan@marcan.st, linux-arm-kernel@lists.infradead.org, robh@kernel.org, arnd@kernel.org, olof@lixom.net, krzk@kernel.org, mark.kettenis@xs4all.nl, tony@atomide.com, mohamed.mediouni@caramail.com, stan@corellium.com, graf@amazon.com, will@kernel.org, linus.walleij@linaro.org, mark.rutland@arm.com, andy.shevchenko@gmail.com, gregkh@linuxfoundation.org, corbet@lwn.net, catalin.marinas@arm.com, hch@infradead.org, davem@davemloft.net, devicetree@vger.kernel.org, linux-serial@vger.kernel.org, linux-doc@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 04 Mar 2021 21:38:43 +0000, Hector Martin wrote: > > ARM64 currently defaults to posted MMIO (nGnRnE), but some devices > require the use of non-posted MMIO (nGnRE). Introduce a new ioremap() > variant to handle this case. ioremap_np() is aliased to ioremap() by > default on arches that do not implement this variant. > > sparc64 is the only architecture that needs to be touched directly, > because it includes neither of the generic io.h or iomap.h headers. > > This adds the IORESOURCE_MEM_NONPOSTED flag, which maps to this > variant and marks a given resource as requiring non-posted mappings. > This is implemented in the resource system because it is a SoC-level > requirement, so existing drivers do not need special-case code to pick > this ioremap variant. > > Then this is implemented in devres by introducing devm_ioremap_np(), > and making devm_ioremap_resource() automatically select this variant > when the resource has the IORESOURCE_MEM_NONPOSTED flag set. > > Signed-off-by: Hector Martin Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.