From patchwork Fri May 11 19:06:07 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: 10395159 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 4172260153 for ; Fri, 11 May 2018 19:13:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3495828C59 for ; Fri, 11 May 2018 19:13:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2861528CB5; Fri, 11 May 2018 19:13:17 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9D13928C59 for ; Fri, 11 May 2018 19:13:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=JaKISwSLUn5buvQJj6AX5QQPHbkgXhB0u5jw+GwOoO8=; b=JEg6PA5b2wL+ugnSRg29qgiRUO mlNkSMwdfJvXReXGOlvzf+cLy+hOT9qk33DY3799xNBJY3UMYLqHVyHbICYjcUnh6nnxkwQp8MY+q nN+TnM0lLLJoS3EjWb7+nLxvUo7/S5kD6ZN1HnbgGpKe/q2nLGXlggRAWPvtUin/sPv+IjLr74zYi gkNDzxQDdzoz1GqjYroJnRRr22eUDNR/XrxbFsT4CRjasjqjAbji0ZkXK7SV+EGCS6LfcAPBD+DqA f3RIn0IsoWKl4NjcwKDn8FlCS9T4mTaYD9impuSyaQiQBKOUd7XLoQjiIAPloF/Qqa9IM1OcFPGsA xklGH62A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fHDTW-00006E-9L; Fri, 11 May 2018 19:13:06 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fHDOj-00059B-Ni for linux-arm-kernel@lists.infradead.org; Fri, 11 May 2018 19:08:11 +0000 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 D8EC71993; Fri, 11 May 2018 12:08:04 -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 9A2503F23C; Fri, 11 May 2018 12:07:59 -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 Subject: [PATCH v2 06/40] iommu/sva: Search mm by PASID Date: Fri, 11 May 2018 20:06:07 +0100 Message-Id: <20180511190641.23008-7-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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180511_120809_823800_B6AE377A X-CRM114-Status: GOOD ( 12.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: xieyisheng1@huawei.com, liubo95@huawei.com, xuzaibo@huawei.com, thunder.leizhen@huawei.com, will.deacon@arm.com, okaya@codeaurora.org, yi.l.liu@intel.com, ashok.raj@intel.com, tn@semihalf.com, joro@8bytes.org, bharatku@xilinx.com, liudongdong3@huawei.com, rfranz@cavium.com, kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, jcrouse@codeaurora.org, rgummal@xilinx.com, jonathan.cameron@huawei.com, shunyong.yang@hxt-semitech.com, robin.murphy@arm.com, ilias.apalodimas@linaro.org, alex.williamson@redhat.com, robdclark@gmail.com, dwmw2@infradead.org, christian.koenig@amd.com, nwatters@codeaurora.org, baolu.lu@linux.intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 6 ++++++ 2 files changed, 32 insertions(+) diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c index e9afae2537a2..5abe0f0b445c 100644 --- a/drivers/iommu/iommu-sva.c +++ b/drivers/iommu/iommu-sva.c @@ -736,3 +736,29 @@ void __iommu_sva_unbind_dev_all(struct device *dev) } } EXPORT_SYMBOL_GPL(__iommu_sva_unbind_dev_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); diff --git a/include/linux/iommu.h b/include/linux/iommu.h index caa6f79785b9..faf3390ce89d 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -1001,6 +1001,7 @@ extern int __iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, extern int __iommu_sva_unbind_device(struct device *dev, int pasid); extern void __iommu_sva_unbind_dev_all(struct device *dev); +extern struct mm_struct *iommu_sva_find(int pasid); #else /* CONFIG_IOMMU_SVA */ static inline int iommu_sva_device_init(struct device *dev, unsigned long features, @@ -1030,6 +1031,11 @@ static inline int __iommu_sva_unbind_device(struct device *dev, int pasid) static inline void __iommu_sva_unbind_dev_all(struct device *dev) { } + +static inline struct mm_struct *iommu_sva_find(int pasid) +{ + return NULL; +} #endif /* CONFIG_IOMMU_SVA */ #endif /* __LINUX_IOMMU_H */