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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 49F6EC433E1 for ; Wed, 1 Jul 2020 02:48:40 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 243A7206EB for ; Wed, 1 Jul 2020 02:48:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 243A7206EB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id CFAC288B74; Wed, 1 Jul 2020 02:48:39 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id y2PNfylrBoV5; Wed, 1 Jul 2020 02:48:38 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id A8CE488B2A; Wed, 1 Jul 2020 02:48:38 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8876EC088F; Wed, 1 Jul 2020 02:48:38 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 3A903C016E for ; Wed, 1 Jul 2020 02:48:37 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 27F0C25F6B for ; Wed, 1 Jul 2020 02:48:37 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WPMt4pznyszR for ; Wed, 1 Jul 2020 02:48:35 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by silver.osuosl.org (Postfix) with ESMTPS id A918B207EF for ; Wed, 1 Jul 2020 02:48:35 +0000 (UTC) IronPort-SDR: tD5sNdrSjT4IzDrQA2M5urSprHtYZNl/ZnofDnknc85KzMLvyjz8GsXF4P2m2bldfyrruj9iw3 /azlSnnhZTdg== X-IronPort-AV: E=McAfee;i="6000,8403,9668"; a="133907347" X-IronPort-AV: E=Sophos;i="5.75,298,1589266800"; d="scan'208";a="133907347" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2020 19:48:34 -0700 IronPort-SDR: ZqRl8Eli7g9xOCZspJgGaUXH7TtPL43fJdA9ke8V+r/KER1ppSGrCmvPTitUSk0Pgaq/tge/YT fyY1GgGBnmJg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,298,1589266800"; d="scan'208";a="295409057" Received: from allen-box.sh.intel.com (HELO [10.239.159.139]) ([10.239.159.139]) by orsmga002.jf.intel.com with ESMTP; 30 Jun 2020 19:48:31 -0700 Subject: Re: [PATCH 4/4] iommu/vt-d: Add page response ops support To: "Tian, Kevin" , "iommu@lists.linux-foundation.org" References: <20200628003332.5720-1-baolu.lu@linux.intel.com> <20200628003332.5720-5-baolu.lu@linux.intel.com> From: Lu Baolu Message-ID: <57d6ced7-943e-a93b-8f6d-11516e9f07b2@linux.intel.com> Date: Wed, 1 Jul 2020 10:44:08 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US Cc: "Raj, Ashok" , "linux-kernel@vger.kernel.org" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hi Kevin, On 6/30/20 2:19 PM, Tian, Kevin wrote: >> From: Lu Baolu >> Sent: Sunday, June 28, 2020 8:34 AM >> >> After a page request is handled, software must response the device which >> raised the page request with the handling result. This is done through >> the iommu ops.page_response if the request was reported to outside of >> vendor iommu driver through iommu_report_device_fault(). This adds the >> VT-d implementation of page_response ops. >> >> Co-developed-by: Jacob Pan >> Signed-off-by: Jacob Pan >> Co-developed-by: Liu Yi L >> Signed-off-by: Liu Yi L >> Signed-off-by: Lu Baolu >> --- >> drivers/iommu/intel/iommu.c | 1 + >> drivers/iommu/intel/svm.c | 73 >> +++++++++++++++++++++++++++++++++++++ >> include/linux/intel-iommu.h | 3 ++ >> 3 files changed, 77 insertions(+) >> >> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c >> index de17952ed133..7eb29167e8f9 100644 >> --- a/drivers/iommu/intel/iommu.c >> +++ b/drivers/iommu/intel/iommu.c >> @@ -6057,6 +6057,7 @@ const struct iommu_ops intel_iommu_ops = { >> .sva_bind = intel_svm_bind, >> .sva_unbind = intel_svm_unbind, >> .sva_get_pasid = intel_svm_get_pasid, >> + .page_response = intel_svm_page_response, >> #endif >> }; >> >> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c >> index 4800bb6f8794..003ea9579632 100644 >> --- a/drivers/iommu/intel/svm.c >> +++ b/drivers/iommu/intel/svm.c >> @@ -1092,3 +1092,76 @@ int intel_svm_get_pasid(struct iommu_sva *sva) >> >> return pasid; >> } >> + >> +int intel_svm_page_response(struct device *dev, >> + struct iommu_fault_event *evt, >> + struct iommu_page_response *msg) >> +{ >> + struct iommu_fault_page_request *prm; >> + struct intel_svm_dev *sdev; >> + struct intel_iommu *iommu; >> + struct intel_svm *svm; >> + bool private_present; >> + bool pasid_present; >> + bool last_page; >> + u8 bus, devfn; >> + int ret = 0; >> + u16 sid; >> + >> + if (!dev || !dev_is_pci(dev)) >> + return -ENODEV; >> + >> + iommu = device_to_iommu(dev, &bus, &devfn); >> + if (!iommu) >> + return -ENODEV; > > move to the place when iommu is referenced. This place is too early. I took this as a sanity check. If the device has no iommu backed, we should consider it as an invalid input. > >> + >> + if (!msg || !evt) >> + return -EINVAL; >> + >> + mutex_lock(&pasid_mutex); >> + >> + prm = &evt->fault.prm; >> + sid = PCI_DEVID(bus, devfn); >> + pasid_present = prm->flags & >> IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; >> + private_present = prm->flags & >> IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA; >> + last_page = prm->flags & >> IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE; >> + >> + if (pasid_present) { >> + /* VT-d supports devices with full 20 bit PASIDs only */ >> + if (pci_max_pasids(to_pci_dev(dev)) != PASID_MAX) { >> + ret = -EINVAL; >> + goto out; >> + } > > shouldn't we check prm->pasid here? Above is more reasonable to be > checked when page request is reported. Yes. I will check the pasid in both places. > >> + >> + ret = pasid_to_svm_sdev(dev, prm->pasid, &svm, &sdev); >> + if (ret || !sdev) > > if sdev==NULL, suppose an error (-ENODEV) should be returned here? Yes. Good catch. I should return an error if sdev==NULL. > >> + goto out; >> + } >> + >> + /* >> + * Per VT-d spec. v3.0 ch7.7, system software must respond >> + * with page group response if private data is present (PDP) >> + * or last page in group (LPIG) bit is set. This is an >> + * additional VT-d feature beyond PCI ATS spec. > > feature->requirement Agreed. > > Thanks > Kevin Best regards, baolu > >> + */ >> + if (last_page || private_present) { >> + struct qi_desc desc; >> + >> + desc.qw0 = QI_PGRP_PASID(prm->pasid) | QI_PGRP_DID(sid) >> | >> + QI_PGRP_PASID_P(pasid_present) | >> + QI_PGRP_PDP(private_present) | >> + QI_PGRP_RESP_CODE(msg->code) | >> + QI_PGRP_RESP_TYPE; >> + desc.qw1 = QI_PGRP_IDX(prm->grpid) | >> QI_PGRP_LPIG(last_page); >> + desc.qw2 = 0; >> + desc.qw3 = 0; >> + if (private_present) >> + memcpy(&desc.qw2, prm->private_data, >> + sizeof(prm->private_data)); >> + >> + qi_submit_sync(iommu, &desc, 1, 0); >> + } >> +out: >> + mutex_unlock(&pasid_mutex); >> + return ret; >> +} >> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h >> index fc2cfc3db6e1..bf6009a344f5 100644 >> --- a/include/linux/intel-iommu.h >> +++ b/include/linux/intel-iommu.h >> @@ -741,6 +741,9 @@ struct iommu_sva *intel_svm_bind(struct device >> *dev, struct mm_struct *mm, >> void *drvdata); >> void intel_svm_unbind(struct iommu_sva *handle); >> int intel_svm_get_pasid(struct iommu_sva *handle); >> +int intel_svm_page_response(struct device *dev, struct iommu_fault_event >> *evt, >> + struct iommu_page_response *msg); >> + >> struct svm_dev_ops; >> >> struct intel_svm_dev { >> -- >> 2.17.1 > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu