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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 1AD8BC4320A for ; Mon, 2 Aug 2021 16:46:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F32D361050 for ; Mon, 2 Aug 2021 16:46:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232069AbhHBQqi (ORCPT ); Mon, 2 Aug 2021 12:46:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:49652 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229640AbhHBQqg (ORCPT ); Mon, 2 Aug 2021 12:46:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 372C360F51; Mon, 2 Aug 2021 16:46:25 +0000 (UTC) Date: Mon, 2 Aug 2021 17:46:22 +0100 From: Catalin Marinas To: Lorenzo Pieralisi Cc: linux-kernel@vger.kernel.org, Hanjun Guo , Ard Biesheuvel , Will Deacon , Sudeep Holla , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Veronika kabatova , Robin Murphy Subject: Re: [PATCH v2 3/3] ACPI: Add memory semantics to acpi_os_map_memory() Message-ID: <20210802164622.GJ18685@arm.com> References: <20210726100026.12538-1-lorenzo.pieralisi@arm.com> <20210802152359.12623-4-lorenzo.pieralisi@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210802152359.12623-4-lorenzo.pieralisi@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 02, 2021 at 04:23:59PM +0100, Lorenzo Pieralisi wrote: > The memory attributes attached to memory regions depend on architecture > specific mappings. > > For some memory regions, the attributes specified by firmware (eg > uncached) are not sufficient to determine how a memory region should be > mapped by an OS (for instance a region that is define as uncached in > firmware can be mapped as Normal or Device memory on arm64) and > therefore the OS must be given control on how to map the region to match > the expected mapping behaviour (eg if a mapping is requested with memory > semantics, it must allow unaligned accesses). > > Rework acpi_os_map_memory() and acpi_os_ioremap() back-end to split > them into two separate code paths: > > acpi_os_memmap() -> memory semantics > acpi_os_ioremap() -> MMIO semantics > > The split allows the architectural implementation back-ends to detect > the default memory attributes required by the mapping in question > (ie the mapping API defines the semantics memory vs MMIO) and map the > memory accordingly. > > Link: https://lore.kernel.org/linux-arm-kernel/31ffe8fc-f5ee-2858-26c5-0fd8bdd68702@arm.com > Tested-by: Hanjun Guo > Signed-off-by: Lorenzo Pieralisi > Acked-by: Ard Biesheuvel > Cc: Ard Biesheuvel > Cc: Will Deacon > Cc: Hanjun Guo > Cc: Sudeep Holla > Cc: Catalin Marinas > Cc: "Rafael J. Wysocki" For the arm64 bits: Acked-by: Catalin Marinas I presume this will get merged via the ACPI tree? -- Catalin