From patchwork Fri May 11 19:06:09 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: 10395163 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 6EC6760348 for ; Fri, 11 May 2018 19:15:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 64FF928E44 for ; Fri, 11 May 2018 19:15:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5831428E57; Fri, 11 May 2018 19:15:04 +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 3387D28E44 for ; Fri, 11 May 2018 19:15:02 +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=05BNW4OOYIIUFcmaSeUuxCaWBW8lT6+du8DwAf3zURc=; b=qhm3GrUoP20bjevTSa+vGicVnm kL9TORIFBU8gssNwEvxIw4ryKxAwrCtLOcIU8Ms17uejVwtxTClLvlJl7q4FuHJD98GMEDIfpo9H7 WURemUfsoX6iH8JMrExlSbPmuV4BLL/O54557WHc68Nz37W/JZxelZ83U/NUlWjbVPBcRNvnoaDUh S69H+KC9NGm40PZuBPQA3tFuFEZj0/32bKrv6DNgXDaMg/WZ1IBv4yNHimokYW3KcOwbgZRHWPIfr 39GmaDcMib8+N3V5MCnRlrjeeN13yIq5o72Fi7724lP9zqYoJeiTu+3xIRX47NWuaYQ3GArStaCw1 eyzVP6cw==; 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 1fHDVC-0000qO-Bv; Fri, 11 May 2018 19:14:50 +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 1fHDOu-0005Er-SP for linux-arm-kernel@lists.infradead.org; Fri, 11 May 2018 19:08:23 +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 DB7CC19E8; Fri, 11 May 2018 12:08:15 -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 9D2DD3F23C; Fri, 11 May 2018 12:08:10 -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 08/40] iommu/iopf: Handle mm faults Date: Fri, 11 May 2018 20:06:09 +0100 Message-Id: <20180511190641.23008-9-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_120820_988809_6665D6CF X-CRM114-Status: GOOD ( 17.61 ) 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 When a recoverable page fault is handled by the fault workqueue, find the associated mm and call handle_mm_fault. Signed-off-by: Jean-Philippe Brucker --- v1->v2: let IOMMU drivers deal with Stop PASID --- drivers/iommu/io-pgfault.c | 86 +++++++++++++++++++++++++++++++++++++- 1 file changed, 84 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c index 321c00dd3a3d..dd2639e5c03b 100644 --- a/drivers/iommu/io-pgfault.c +++ b/drivers/iommu/io-pgfault.c @@ -7,6 +7,7 @@ #include #include +#include #include #include @@ -65,8 +66,65 @@ static int iopf_complete(struct device *dev, struct iommu_fault_event *evt, static enum page_response_code iopf_handle_single(struct iopf_context *fault) { - /* TODO */ - return -ENODEV; + int ret; + struct mm_struct *mm; + struct vm_area_struct *vma; + unsigned int access_flags = 0; + unsigned int fault_flags = FAULT_FLAG_REMOTE; + struct iommu_fault_event *evt = &fault->evt; + enum page_response_code status = IOMMU_PAGE_RESP_INVALID; + + if (!evt->pasid_valid) + return status; + + mm = iommu_sva_find(evt->pasid); + if (!mm) + return status; + + down_read(&mm->mmap_sem); + + vma = find_extend_vma(mm, evt->addr); + if (!vma) + /* Unmapped area */ + goto out_put_mm; + + if (evt->prot & IOMMU_FAULT_READ) + access_flags |= VM_READ; + + if (evt->prot & IOMMU_FAULT_WRITE) { + access_flags |= VM_WRITE; + fault_flags |= FAULT_FLAG_WRITE; + } + + if (evt->prot & IOMMU_FAULT_EXEC) { + access_flags |= VM_EXEC; + fault_flags |= FAULT_FLAG_INSTRUCTION; + } + + if (!(evt->prot & IOMMU_FAULT_PRIV)) + fault_flags |= FAULT_FLAG_USER; + + if (access_flags & ~vma->vm_flags) + /* Access fault */ + goto out_put_mm; + + ret = handle_mm_fault(vma, evt->addr, fault_flags); + status = ret & VM_FAULT_ERROR ? IOMMU_PAGE_RESP_INVALID : + IOMMU_PAGE_RESP_SUCCESS; + +out_put_mm: + up_read(&mm->mmap_sem); + + /* + * If the process exits while we're handling the fault on its mm, we + * can't do mmput(). exit_mmap() would release the MMU notifier, calling + * iommu_notifier_release(), which has to flush the fault queue that + * we're executing on... So mmput_async() moves the release of the mm to + * another thread, if we're the last user. + */ + mmput_async(mm); + + return status; } static void iopf_handle_group(struct work_struct *work) @@ -100,6 +158,30 @@ static void iopf_handle_group(struct work_struct *work) * @cookie: struct device, passed to iommu_register_device_fault_handler. * * Add a fault to the device workqueue, to be handled by mm. + * + * This module doesn't handle PCI PASID Stop Marker; IOMMU drivers must discard + * them before reporting faults. A PASID Stop Marker (LRW = 0b100) doesn't + * expect a response. It may be generated when disabling a PASID (issuing a + * PASID stop request) by some PCI devices. + * + * The PASID stop request is triggered by the mm_exit() callback. When the + * callback returns from the device driver, no page request is generated for + * this PASID anymore and outstanding ones have been pushed to the IOMMU (as per + * PCIe 4.0r1.0 - 6.20.1 and 10.4.1.2 - Managing PASID TLP Prefix Usage). Some + * PCI devices will wait for all outstanding page requests to come back with a + * response before completing the PASID stop request. Others do not wait for + * page responses, and instead issue this Stop Marker that tells us when the + * PASID can be reallocated. + * + * It is safe to discard the Stop Marker because it is an optimization. + * a. Page requests, which are posted requests, have been flushed to the IOMMU + * when mm_exit() returns, + * b. We flush all fault queues after mm_exit() returns and before freeing the + * PASID. + * + * So even though the Stop Marker might be issued by the device *after* the stop + * request completes, outstanding faults will have been dealt with by the time + * we free the PASID. */ int iommu_queue_iopf(struct iommu_fault_event *evt, void *cookie) {