From patchwork Thu Sep 20 17:00:42 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: 972606 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=arm.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42GNsN0w0tz9sC2 for ; Fri, 21 Sep 2018 03:25:12 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732761AbeITXJl (ORCPT ); Thu, 20 Sep 2018 19:09:41 -0400 Received: from foss.arm.com ([217.140.101.70]:50214 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726781AbeITXJl (ORCPT ); Thu, 20 Sep 2018 19:09:41 -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 5FE1B15AD; Thu, 20 Sep 2018 10:25:10 -0700 (PDT) Received: from ostrya.Emea.Arm.com (ostrya.emea.arm.com [10.4.12.111]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B66D13F557; Thu, 20 Sep 2018 10:25:06 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org Cc: joro@8bytes.org, linux-pci@vger.kernel.org, jcrouse@codeaurora.org, alex.williamson@redhat.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, eric.auger@redhat.com, kevin.tian@intel.com, yi.l.liu@intel.com, andrew.murray@arm.com, will.deacon@arm.com, robin.murphy@arm.com, ashok.raj@intel.com, baolu.lu@linux.intel.com, xuzaibo@huawei.com, liguozhu@hisilicon.com, okaya@codeaurora.org, bharatku@xilinx.com, ilias.apalodimas@linaro.org, shunyong.yang@hxt-semitech.com Subject: [PATCH v3 06/10] iommu/sva: Search mm by PASID Date: Thu, 20 Sep 2018 18:00:42 +0100 Message-Id: <20180920170046.20154-7-jean-philippe.brucker@arm.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180920170046.20154-1-jean-philippe.brucker@arm.com> References: <20180920170046.20154-1-jean-philippe.brucker@arm.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The fault handler will need to find an mm given its PASID. This is the reason we have an IDR for storing address spaces, so hook it up. Signed-off-by: Jean-Philippe Brucker --- drivers/iommu/iommu-sva.c | 26 ++++++++++++++++++++++++++ include/linux/iommu.h | 7 +++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c index 5ff8967cb213..ee86f00ee1b9 100644 --- a/drivers/iommu/iommu-sva.c +++ b/drivers/iommu/iommu-sva.c @@ -636,6 +636,32 @@ void iommu_sva_unbind_device_all(struct device *dev) } EXPORT_SYMBOL_GPL(iommu_sva_unbind_device_all); +/** + * iommu_sva_find() - Find mm associated to the given PASID + * @pasid: Process Address Space ID assigned to the mm + * + * Returns the mm corresponding to this PASID, or NULL if not found. A reference + * to the mm is taken, and must be released with mmput(). + */ +struct mm_struct *iommu_sva_find(int pasid) +{ + struct io_mm *io_mm; + struct mm_struct *mm = NULL; + + spin_lock(&iommu_sva_lock); + io_mm = idr_find(&iommu_pasid_idr, pasid); + if (io_mm && io_mm_get_locked(io_mm)) { + if (mmget_not_zero(io_mm->mm)) + mm = io_mm->mm; + + io_mm_put_locked(io_mm); + } + spin_unlock(&iommu_sva_lock); + + return mm; +} +EXPORT_SYMBOL_GPL(iommu_sva_find); + /** * iommu_sva_init_device() - Initialize Shared Virtual Addressing for a device * @dev: the device diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 429f3dc37a35..a457650b80de 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -987,6 +987,8 @@ extern int __iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata); extern int __iommu_sva_unbind_device(struct device *dev, int pasid); extern void iommu_sva_unbind_device_all(struct device *dev); +extern struct mm_struct *iommu_sva_find(int pasid); + #else /* CONFIG_IOMMU_SVA */ static inline int iommu_sva_init_device(struct device *dev, unsigned long features, @@ -1016,6 +1018,11 @@ static inline int __iommu_sva_unbind_device(struct device *dev, int pasid) static inline void iommu_sva_unbind_device_all(struct device *dev) { } + +static inline struct mm_struct *iommu_sva_find(int pasid) +{ + return NULL; +} #endif /* CONFIG_IOMMU_SVA */ #endif /* __LINUX_IOMMU_H */