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=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 17633C4361B for ; Fri, 18 Dec 2020 08:40:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFAAB22D72 for ; Fri, 18 Dec 2020 08:40:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733055AbgLRIjz (ORCPT ); Fri, 18 Dec 2020 03:39:55 -0500 Received: from m43-15.mailgun.net ([69.72.43.15]:49580 "EHLO m43-15.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732284AbgLRIjy (ORCPT ); Fri, 18 Dec 2020 03:39:54 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1608280769; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=1FjPyQUiEQRFSNgMgFxEduBUw7HO1HzLVIZtFQNj/zM=; b=PDTCd3opIn9oD8gY206pEQOV61Ku9JT36CT4V+lLgN4P0J/A7vyd5zquoolk8YO87ikNIaI4 IM5ojE0SC0RbSL/54ty7movyI9S9ahnlpgfi6BHiO6BI6J+3g5X0/fYXPNMCOhtO6H8IAobS x4h71jhq9+reUAIifdUMyERXiwc= X-Mailgun-Sending-Ip: 69.72.43.15 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n06.prod.us-east-1.postgun.com with SMTP id 5fdc6aa60564dfefcd502cfd (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 18 Dec 2020 08:39:02 GMT Sender: isaacm=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 90CD8C43466; Fri, 18 Dec 2020 08:39:01 +0000 (UTC) Received: from isaacm-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: isaacm) by smtp.codeaurora.org (Postfix) with ESMTPSA id 696AEC433CA; Fri, 18 Dec 2020 08:39:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 696AEC433CA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=isaacm@codeaurora.org From: "Isaac J. Manjarres" To: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: "Isaac J. Manjarres" , will@kernel.org, joro@8bytes.org, robin.murphy@arm.com, pdaly@codeaurora.org, pratikp@codeaurora.org, kernel-team@android.com Subject: [RFC PATCH 0/3] iommu: Permit modular builds of io-pgtable drivers Date: Fri, 18 Dec 2020 00:38:39 -0800 Message-Id: <1608280722-19841-1-git-send-email-isaacm@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The goal of the Generic Kernel Image (GKI) effort is to have a common image that works across multiple Android devices. This involves generating a kernel image that has core features integrated into it, while SoC specific functionality can be added to the kernel for the device as a module. Along with modularizing IOMMU drivers, this also means building the io-pgtable code as modules, which allows for SoC vendors to only include the io-pgtable implementations that they use. For example, GKI for arm64 must include support for both the IOMMU ARM LPAE/V7S formats at the moment. Having the code for both formats as modules allows SoC vendors to only provide the page table format that they use, along with their IOMMU driver. Modularizing both io-pgtable.c, as well as the io-pgtable-arm[-v7s].c files, works out rather nicely, as the main interface that clients use to interact with the page tables is already exported (i.e. alloc_io_pgtable_ops and free_io_pgtable_ops). It also makes it so that neither the io-pgtable-arm[-v7s] modules or the io-pgtable modules can be unloaded without unloading the IOMMU driver, which can only happen when there aren't any references to the IOMMU driver module. Thanks in advance for the feedback, Isaac J. Manjarres Isaac J. Manjarres (3): iommu/io-pgtable-arm: Prepare for modularization iommu/io-pgtable: Prepare for modularization iommu/io-pgtable: Allow building as a module drivers/iommu/Kconfig | 6 +++--- drivers/iommu/io-pgtable-arm-v7s.c | 4 ++++ drivers/iommu/io-pgtable-arm.c | 8 ++++++++ drivers/iommu/io-pgtable.c | 7 +++++-- 4 files changed, 20 insertions(+), 5 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project