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Tue, 03 Aug 2021 09:23:42 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mAqX0-001kgL-0x for linux-arm-kernel@lists.infradead.org; Tue, 03 Aug 2021 09:16:15 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 83B5411D4; Tue, 3 Aug 2021 02:16:12 -0700 (PDT) Received: from lpieralisi (e121166-lin.cambridge.arm.com [10.1.196.255]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 11A933F40C; Tue, 3 Aug 2021 02:16:10 -0700 (PDT) Date: Tue, 3 Aug 2021 10:16:05 +0100 From: Lorenzo Pieralisi To: Catalin Marinas , rjw@rjwysocki.net Cc: linux-kernel@vger.kernel.org, Hanjun Guo , Ard Biesheuvel , Will Deacon , Sudeep Holla , 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: <20210803091605.GA9637@lpieralisi> References: <20210726100026.12538-1-lorenzo.pieralisi@arm.com> <20210802152359.12623-4-lorenzo.pieralisi@arm.com> <20210802164622.GJ18685@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210802164622.GJ18685@arm.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210803_021614_173794_7DD958E2 X-CRM114-Status: GOOD ( 21.67 ) 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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Aug 02, 2021 at 05:46:22PM +0100, Catalin Marinas wrote: > 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? Thank you, I don't know what's the best option in Rafael's opinion (of course if he is OK with the patches which are mostly touching ACPI code). Lorenzo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel