From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757854AbcILS6w (ORCPT ); Mon, 12 Sep 2016 14:58:52 -0400 Received: from mail-lf0-f47.google.com ([209.85.215.47]:34162 "EHLO mail-lf0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754813AbcILS6u (ORCPT ); Mon, 12 Sep 2016 14:58:50 -0400 Subject: Re: [UPDATE PATCH V11 1/8] ACPI: I/O Remapping Table (IORT) initial support To: marc.zyngier@arm.com, tglx@linutronix.de, jason@lakedaemon.net, rjw@rjwysocki.net, helgaas@kernel.org, rafael@kernel.org, Lorenzo.Pieralisi@arm.com References: <1473705147-6588-2-git-send-email-tn@semihalf.com> <1473706460-9037-1-git-send-email-tn@semihalf.com> Cc: will.deacon@arm.com, catalin.marinas@arm.com, hanjun.guo@linaro.org, shijie.huang@arm.com, robert.richter@caviumnetworks.com, mw@semihalf.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-acpi@lists.linaro.org, andrea.gallo@linaro.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, al.stone@linaro.org, graeme.gregory@linaro.org, ddaney.cavm@gmail.com, okaya@codeaurora.org From: Tomasz Nowicki Message-ID: <87c1d6a4-a760-9f8a-ddbe-7cf6655d575b@semihalf.com> Date: Mon, 12 Sep 2016 20:58:42 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <1473706460-9037-1-git-send-email-tn@semihalf.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12.09.2016 20:54, Tomasz Nowicki wrote: > IORT shows representation of IO topology for ARM based systems. > It describes how various components are connected together on > parent-child basis e.g. PCI RC -> SMMU -> ITS. Also see IORT spec. > http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf > > Initial support allows to detect IORT table presence and save its > root pointer obtained through acpi_get_table(). The pointer validity > depends on acpi_gbl_permanent_mmap because if acpi_gbl_permanent_mmap > is not set while using IORT nodes we would dereference unmapped pointers. > > For the aforementioned reason call acpi_iort_init() from acpi_init() > which guarantees acpi_gbl_permanent_mmap to be set at that point. > > Add generic helpers which are helpful for scanning and retrieving > information from IORT table content. List of the most important helpers: > - iort_find_dev_node() finds IORT node for a given device > - iort_node_map_rid() maps device RID and returns IORT node which provides > final translation > > IORT support is placed under drivers/acpi/arm64/ new directory due to its > ARM64 specific nature. The code there is considered only for ARM64. > The long term plan is to keep all ARM64 specific tables support > in this place e.g. GTDT table. > > Signed-off-by: Tomasz Nowicki > Acked-by: Rafael J. Wysocki > Reviewed-by: Hanjun Guo > Reviewed-by: Lorenzo Pieralisi Hi Marc, Series with updated patch 1 can be found: https://github.com/semihalf-nowicki-tomasz/linux.git (its-acpi-v11) Sorry for zillions of patch updates... Thanks, Tomasz