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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 B245EC35669 for ; Sat, 22 Feb 2020 23:38:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8551B206EF for ; Sat, 22 Feb 2020 23:38:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="KsM6sFEt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726884AbgBVXif (ORCPT ); Sat, 22 Feb 2020 18:38:35 -0500 Received: from mail-lj1-f196.google.com ([209.85.208.196]:37779 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726865AbgBVXif (ORCPT ); Sat, 22 Feb 2020 18:38:35 -0500 Received: by mail-lj1-f196.google.com with SMTP id q23so6066596ljm.4 for ; Sat, 22 Feb 2020 15:38:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=h6NihziCTyZMAUdv/tajx8t4ufGMIb+wHMLzzNaM6Qc=; b=KsM6sFEt0PpXEdyf2g72FHXKriIH7ohllYlnTqE9t2lgHEQ/FgJKQBR/LbvEqGTeH0 zS1h/7IkcSQulywMOMsTWj2DIHqg3hWW+US/H3nXZjlvZA1nNhdJ3WGdQQlnsENPmgqY p73FdtM589cbmZCb34mHbMWS8OZLFahbyxrn8iOSIsTnUpFUqRBO++k3Jw9ziK24sB14 1aEJkNkdhEPN/DwB9zunSF9ErK707rj1NqaFQRD0syG6oCo4aPIVR0XaMUx2kJSBIx29 OhwRrCD9Ex4HVVr1r/dJzSMmSwAcEyMUmo32cG5Vx50/hb/WXwU9SEgXnf6wt/Hu9Bzq XYhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=h6NihziCTyZMAUdv/tajx8t4ufGMIb+wHMLzzNaM6Qc=; b=NPk3HPdN/cxWWguuDeQEfsmgFvoJXORq2DHroYqUuTZIHtrZNQYXw1ioCs10LbAkSO ae5QD6zI6ObP5AX0I/crHxHAszUB7Njsunvrk7uB8YdQ+YZ5ODAO51IyRka3y55VbxsC 5hYhorUMCzXpka8D4cJb3YJoRITB4m6fXGU6hqpqdVnE07uSdVe3sHy2u8Gn0sEpcSQ7 tJXtIOxqUo+SqCxhEng7D99PI01VQFCK8Noe5JpdcFL95KbBn8HIQMb+/i2jIILFPg0b Q+OIk/Vczkr+uDLnAM34o6EAcRzLD9/zrgpz+1JbqGk9uOMe535THokJpyQDQzKB8NfS UATQ== X-Gm-Message-State: APjAAAUpTf+kI+mfF+FxM0IsIaUrr9iKGtgyfyAO08/qzv1nLY1Us7Fv +Mqk5FicPxmjKpH3pHADrL4RNR5MBlASq4/+FmxYzA== X-Google-Smtp-Source: APXvYqziLZ994tDnwRiLck1FaENzmhT9e4Iye+IQizxx2JZmB9oorbeE1//5MgiHKZhF8rfXYT8vkMOYdjt9JS7vGvw= X-Received: by 2002:a2e:b6ce:: with SMTP id m14mr24505315ljo.99.1582414711800; Sat, 22 Feb 2020 15:38:31 -0800 (PST) MIME-Version: 1.0 References: <20200219094340.16597-1-ardb@kernel.org> <01039e92-8354-a75f-44de-7638b103be42@arm.com> In-Reply-To: <01039e92-8354-a75f-44de-7638b103be42@arm.com> From: Linus Walleij Date: Sun, 23 Feb 2020 00:38:20 +0100 Message-ID: Subject: Re: [PATCH v2 0/4] ARM: decompressor: use by-VA cache maintenance for v7 cores To: Robin Murphy Cc: Ard Biesheuvel , linux-efi , Arnd Bergmann , Nicolas Pitre , Tony Lindgren , Marc Zyngier , Russell King , Catalin Marinas , linux-arm-kernel Content-Type: text/plain; charset="UTF-8" Sender: linux-efi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org On Fri, Feb 21, 2020 at 5:09 PM Robin Murphy wrote: > On 21/02/2020 1:42 pm, Ard Biesheuvel wrote: > > OK, so where should it be instead? Are you saying it is now required > > to have a /soc or /smb node that contains all the device nodes? > > That is now my understanding, yes - if there is some property of the > system interconnect which is not entirely transparent relative to the > conceptual CPU-visible physical address space and needs to be described, > then the only way to correctly encode that in DT is with an explicit > level of 'bus' in the hierarchy to represent that interconnect. > Otherwise these address translation properties quickly end up in > philosophical conundrums over what the parent of the root node is. This confirms my similar understanding. Rob sent a patch to remove the root level dma-ranges from the ARM Integrator, and I have since added it back below the logic module bus after you pointed out that the dma-ranges was actually there for that very bus. Yours, Linus Walleij