From patchwork Fri May 11 19:06:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 10394945 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DDD116053A for ; Fri, 11 May 2018 19:09:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CBB6428F6C for ; Fri, 11 May 2018 19:09:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BF7B528F8B; Fri, 11 May 2018 19:09:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F2CC28F95 for ; Fri, 11 May 2018 19:09:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752100AbeEKTJI (ORCPT ); Fri, 11 May 2018 15:09:08 -0400 Received: from foss.arm.com ([217.140.101.70]:46550 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752087AbeEKTJG (ORCPT ); Fri, 11 May 2018 15:09:06 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 86B6C1993; Fri, 11 May 2018 12:09:06 -0700 (PDT) Received: from ostrya.cambridge.arm.com (ostrya.cambridge.arm.com [10.1.210.33]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 48AA43F23C; Fri, 11 May 2018 12:09:01 -0700 (PDT) From: Jean-Philippe Brucker To: linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-mm@kvack.org Cc: joro@8bytes.org, will.deacon@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, tn@semihalf.com, liubo95@huawei.com, thunder.leizhen@huawei.com, xieyisheng1@huawei.com, xuzaibo@huawei.com, ilias.apalodimas@linaro.org, jonathan.cameron@huawei.com, liudongdong3@huawei.com, shunyong.yang@hxt-semitech.com, nwatters@codeaurora.org, okaya@codeaurora.org, jcrouse@codeaurora.org, rfranz@cavium.com, dwmw2@infradead.org, jacob.jun.pan@linux.intel.com, yi.l.liu@intel.com, ashok.raj@intel.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, robdclark@gmail.com, christian.koenig@amd.com, bharatku@xilinx.com, rgummal@xilinx.com Subject: [PATCH v2 17/40] iommu/arm-smmu-v3: Link domains and devices Date: Fri, 11 May 2018 20:06:18 +0100 Message-Id: <20180511190641.23008-18-jean-philippe.brucker@arm.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180511190641.23008-1-jean-philippe.brucker@arm.com> References: <20180511190641.23008-1-jean-philippe.brucker@arm.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When removing a mapping from a domain, we need to send an invalidation to all devices that might have stored it in their Address Translation Cache (ATC). In addition when updating the context descriptor of a live domain, we'll need to send invalidations for all devices attached to it. Maintain a list of devices in each domain, protected by a spinlock. It is updated every time we attach or detach devices to and from domains. It needs to be a spinlock because we'll invalidate ATC entries from within hardirq-safe contexts, but it may be possible to relax the read side with RCU later. Signed-off-by: Jean-Philippe Brucker --- drivers/iommu/arm-smmu-v3.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 1d647104bccc..c892f012fb43 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -595,6 +595,11 @@ struct arm_smmu_device { struct arm_smmu_master_data { struct arm_smmu_device *smmu; struct arm_smmu_strtab_ent ste; + + struct arm_smmu_domain *domain; + struct list_head list; /* domain->devices */ + + struct device *dev; }; /* SMMU private data for an IOMMU domain */ @@ -618,6 +623,9 @@ struct arm_smmu_domain { }; struct iommu_domain domain; + + struct list_head devices; + spinlock_t devices_lock; }; struct arm_smmu_option_prop { @@ -1470,6 +1478,9 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type) } mutex_init(&smmu_domain->init_mutex); + INIT_LIST_HEAD(&smmu_domain->devices); + spin_lock_init(&smmu_domain->devices_lock); + return &smmu_domain->domain; } @@ -1685,7 +1696,17 @@ static void arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec) static void arm_smmu_detach_dev(struct device *dev) { + unsigned long flags; struct arm_smmu_master_data *master = dev->iommu_fwspec->iommu_priv; + struct arm_smmu_domain *smmu_domain = master->domain; + + if (smmu_domain) { + spin_lock_irqsave(&smmu_domain->devices_lock, flags); + list_del(&master->list); + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); + + master->domain = NULL; + } master->ste.assigned = false; arm_smmu_install_ste_for_dev(dev->iommu_fwspec); @@ -1694,6 +1715,7 @@ static void arm_smmu_detach_dev(struct device *dev) static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) { int ret = 0; + unsigned long flags; struct arm_smmu_device *smmu; struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); struct arm_smmu_master_data *master; @@ -1729,6 +1751,11 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) } ste->assigned = true; + master->domain = smmu_domain; + + spin_lock_irqsave(&smmu_domain->devices_lock, flags); + list_add(&master->list, &smmu_domain->devices); + spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); if (smmu_domain->stage == ARM_SMMU_DOMAIN_BYPASS) { ste->s1_cfg = NULL; @@ -1847,6 +1874,7 @@ static int arm_smmu_add_device(struct device *dev) return -ENOMEM; master->smmu = smmu; + master->dev = dev; fwspec->iommu_priv = master; }