From patchwork Tue Sep 1 03:34:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 11747313 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B71B91667 for ; Tue, 1 Sep 2020 03:40:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A6E5E2083B for ; Tue, 1 Sep 2020 03:40:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726948AbgIADkV (ORCPT ); Mon, 31 Aug 2020 23:40:21 -0400 Received: from mga12.intel.com ([192.55.52.136]:62487 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726858AbgIADkU (ORCPT ); Mon, 31 Aug 2020 23:40:20 -0400 IronPort-SDR: vL6N2OcbuYhC7tUuqY9DG4fvHqeRjCs4YOGVnGZr3lleM/fAw1scES0Cq9c77jWBHjQb6A3v+R qPtB4P6fQcQw== X-IronPort-AV: E=McAfee;i="6000,8403,9730"; a="136620927" X-IronPort-AV: E=Sophos;i="5.76,377,1592895600"; d="scan'208";a="136620927" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2020 20:40:19 -0700 IronPort-SDR: Uny4FzJVSCQSqgN74qadmFaEVq0jXOHDJs5Rw8/0OyW8mPY7F0J5iFfI4/WGMAUCuxwk0CA2ju mt5Y1hThFPPA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,377,1592895600"; d="scan'208";a="325180890" Received: from allen-box.sh.intel.com ([10.239.159.139]) by fmsmga004.fm.intel.com with ESMTP; 31 Aug 2020 20:40:15 -0700 From: Lu Baolu To: Joerg Roedel , Alex Williamson Cc: Robin Murphy , Jean-Philippe Brucker , Cornelia Huck , Kevin Tian , Ashok Raj , Dave Jiang , Liu Yi L , Zeng Xin , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Lu Baolu Subject: [PATCH v4 3/5] iommu: Add iommu_aux_get_domain_for_dev() Date: Tue, 1 Sep 2020 11:34:20 +0800 Message-Id: <20200901033422.22249-4-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200901033422.22249-1-baolu.lu@linux.intel.com> References: <20200901033422.22249-1-baolu.lu@linux.intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The device driver needs an API to get its aux-domain. A typical usage scenario is: unsigned long pasid; struct iommu_domain *domain; struct device *dev = mdev_dev(mdev); struct device *iommu_device = vfio_mdev_get_iommu_device(dev); domain = iommu_aux_get_domain_for_dev(dev); if (!domain) return -ENODEV; pasid = iommu_aux_get_pasid(domain, iommu_device); if (pasid <= 0) return -EINVAL; /* Program the device context */ .... This adds an API for such use case. Suggested-by: Alex Williamson Link: https://lore.kernel.org/linux-iommu/20200708130749.1b1e1421@x1.home/ Signed-off-by: Lu Baolu --- drivers/iommu/iommu.c | 18 ++++++++++++++++++ include/linux/iommu.h | 20 ++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index fb21c2ff4861..8fd93a5b8764 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2893,6 +2893,24 @@ void iommu_detach_subdev_group(struct iommu_domain *domain, } EXPORT_SYMBOL_GPL(iommu_detach_subdev_group); +struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *subdev) +{ + struct iommu_domain *domain = NULL; + struct iommu_group *group; + + group = iommu_group_get(subdev); + if (!group || !group->domain) + return NULL; + + if (domain_is_aux(group->domain, subdev)) + domain = group->domain; + + iommu_group_put(group); + + return domain; +} +EXPORT_SYMBOL_GPL(iommu_aux_get_domain_for_dev); + /** * iommu_sva_bind_device() - Bind a process address space to a device * @dev: the device diff --git a/include/linux/iommu.h b/include/linux/iommu.h index b9df8b510d4f..ea660a887dbf 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -120,6 +120,7 @@ enum iommu_attr { DOMAIN_ATTR_NESTING, /* two stages of translation */ DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, DOMAIN_ATTR_MAX, + DOMAIN_ATTR_IS_AUX, }; /* These are the possible reserved region types */ @@ -622,6 +623,12 @@ static inline void dev_iommu_priv_set(struct device *dev, void *priv) dev->iommu->priv = priv; } +static inline bool +domain_is_aux(struct iommu_domain *domain, struct device *subdev) +{ + return iommu_domain_get_attr(domain, DOMAIN_ATTR_IS_AUX, subdev); +} + int iommu_probe_device(struct device *dev); void iommu_release_device(struct device *dev); @@ -638,6 +645,7 @@ int iommu_attach_subdev_group(struct iommu_domain *domain, void iommu_detach_subdev_group(struct iommu_domain *domain, struct iommu_group *group, iommu_device_lookup_t fn); +struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *subdev); struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, @@ -1039,6 +1047,18 @@ iommu_detach_subdev_group(struct iommu_domain *domain, struct iommu_group *group { } +static inline bool +domain_is_aux(struct iommu_domain *domain, struct device *subdev) +{ + return false; +} + +static inline struct iommu_domain * +iommu_aux_get_domain_for_dev(struct device *subdev) +{ + return NULL; +} + static inline struct iommu_sva * iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) {