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=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 EB20FCA9EC5 for ; Wed, 30 Oct 2019 14:51:55 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AACFC2054F for ; Wed, 30 Oct 2019 14:51:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="SiVarWNl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AACFC2054F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 180E5C8B; Wed, 30 Oct 2019 14:51:20 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 5A8D9C8E for ; Wed, 30 Oct 2019 14:51:19 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id E60CE8A for ; Wed, 30 Oct 2019 14:51:18 +0000 (UTC) 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 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 Cc: Bjorn Helgaas , Robin Murphy , Will Deacon X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu