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=-4.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 F3962CA9EC5 for ; Wed, 30 Oct 2019 14:51:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C4ED321734 for ; Wed, 30 Oct 2019 14:51:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572447080; bh=fGY4lwQed6kXKr5Reh7oVYWsIVXScMRNH9ALNwy+qSg=; h=From:To:Cc:Subject:Date:List-ID:From; b=f1o0bo2fTCYIesoPKAd+Skc+qXUzKb82YNDNdpIO3F5dypt3VRO1A+dV/XgsrG/ID f8vqtFlyAMWrBeHuBJa0c7eKl3cUwyOqfgPWrVJ4eUb6ZDOCsLBV07SK0su9s5hS2d 6ScbPwZFcMUcVoYWvzAxSvcsWUFN/EnkzaSqfrCI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726530AbfJ3OvT (ORCPT ); Wed, 30 Oct 2019 10:51:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:57558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726259AbfJ3OvT (ORCPT ); Wed, 30 Oct 2019 10:51:19 -0400 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 64ED320856; Wed, 30 Oct 2019 14:51:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572447078; bh=fGY4lwQed6kXKr5Reh7oVYWsIVXScMRNH9ALNwy+qSg=; h=From:To:Cc:Subject:Date:From; b=SiVarWNl5Lv4nOXK6mU4X2uIu2qZbZcZKslAwfQCTX3dVRpk4EtEegjAXd2Z3/Jlt hVNdpEIViMEGTdmZMVV5eIbAZvOiXQ6A+g1iG0vrZ3ndOFzo/6BUTyYQLiZKJRQXIP h6nlrJJHJUJTbObV1dQdPhXT0aYnBO1cRVTrhf/c= From: Will Deacon To: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: Will Deacon , Robin Murphy , Joerg Roedel , Bjorn Helgaas , Lorenzo Pieralisi Subject: [PATCH 0/7] iommu: Permit modular builds of ARM SMMU[v3] drivers Date: Wed, 30 Oct 2019 14:51:05 +0000 Message-Id: <20191030145112.19738-1-will@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, As part of the work to enable a "Generic Kernel Image" across multiple Android devices, there is a need to seperate shared, core kernel code from modular driver code that may not be needed by all SoCs. This means building IOMMU drivers as modules. It turns out that most of the groundwork has already been done to enable the ARM SMMU drivers to be 'tristate' options in drivers/iommu/Kconfig; with a few symbols exported from the IOMMU/PCI core, everything builds nicely out of the box. The one exception is support for the legacy SMMU DT binding, which is not in widespread use and has never worked with modules, so we can simply remove that when building as a module rather than try to paper over it with even more hacks. Obviously you need to be careful about using IOMMU drivers as modules, since late loading of the driver for an IOMMU serving active DMA masters is going to end badly in many cases. On Android, we're using device links to ensure that the IOMMU probes first. Comments welcome, Will Cc: Robin Murphy Cc: Joerg Roedel Cc: Bjorn Helgaas Cc: Lorenzo Pieralisi --->8 Will Deacon (7): drivers/iommu: Export core IOMMU API symbols to permit modular drivers iommu/of: Request ACS from the PCI core when configuring IOMMU linkage PCI: Export pci_ats_disabled() as a GPL symbol to modules Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular" iommu/arm-smmu-v3: Allow building as a module Revert "iommu/arm-smmu: Make arm-smmu explicitly non-modular" iommu/arm-smmu: Allow building as a module drivers/iommu/Kconfig | 16 ++++++- drivers/iommu/arm-smmu-impl.c | 6 +++ drivers/iommu/arm-smmu-v3.c | 26 +++++++---- drivers/iommu/arm-smmu.c | 86 +++++++++++++++++++++-------------- drivers/iommu/iommu-sysfs.c | 5 ++ drivers/iommu/iommu.c | 8 ++++ drivers/iommu/of_iommu.c | 1 + drivers/pci/pci.c | 1 + 8 files changed, 102 insertions(+), 47 deletions(-) -- 2.24.0.rc0.303.g954a862665-goog