From patchwork Mon Nov 15 02:05:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 12618549 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3EA9C433EF for ; Mon, 15 Nov 2021 02:14:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8C7560FD8 for ; Mon, 15 Nov 2021 02:14:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236279AbhKOCRp (ORCPT ); Sun, 14 Nov 2021 21:17:45 -0500 Received: from mga03.intel.com ([134.134.136.65]:15446 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236378AbhKOCNw (ORCPT ); Sun, 14 Nov 2021 21:13:52 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10168"; a="233307253" X-IronPort-AV: E=Sophos;i="5.87,235,1631602800"; d="scan'208";a="233307253" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Nov 2021 18:10:57 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,235,1631602800"; d="scan'208";a="505714623" Received: from allen-box.sh.intel.com ([10.239.159.118]) by orsmga008.jf.intel.com with ESMTP; 14 Nov 2021 18:10:52 -0800 From: Lu Baolu To: Greg Kroah-Hartman , Joerg Roedel , Alex Williamson , Bjorn Helgaas , Jason Gunthorpe , Kevin Tian , Ashok Raj Cc: Will Deacon , rafael@kernel.org, Diana Craciun , Cornelia Huck , Eric Auger , Liu Yi L , Jacob jun Pan , Chaitanya Kulkarni , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 06/11] iommu: Expose group variants of dma ownership interfaces Date: Mon, 15 Nov 2021 10:05:47 +0800 Message-Id: <20211115020552.2378167-7-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211115020552.2378167-1-baolu.lu@linux.intel.com> References: <20211115020552.2378167-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The vfio needs to set DMA_OWNER_USER for the entire group when attaching it to a vfio container. So expose group variants of setting/releasing dma ownership for this purpose. This also exposes the helper iommu_group_dma_owner_unclaimed() for vfio report to userspace if the group is viable to user assignment, for compatibility with VFIO_GROUP_FLAGS_VIABLE. Signed-off-by: Lu Baolu --- include/linux/iommu.h | 21 ++++++++++++++++ drivers/iommu/iommu.c | 57 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index f77eb9e7788a..3d2dfd220d3c 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -696,6 +696,10 @@ u32 iommu_sva_get_pasid(struct iommu_sva *handle); int iommu_device_set_dma_owner(struct device *dev, enum iommu_dma_owner owner, struct file *user_file); void iommu_device_release_dma_owner(struct device *dev, enum iommu_dma_owner owner); +int iommu_group_set_dma_owner(struct iommu_group *group, enum iommu_dma_owner owner, + struct file *user_file); +void iommu_group_release_dma_owner(struct iommu_group *group, enum iommu_dma_owner owner); +bool iommu_group_dma_owner_unclaimed(struct iommu_group *group); #else /* CONFIG_IOMMU_API */ @@ -1112,6 +1116,23 @@ static inline void iommu_device_release_dma_owner(struct device *dev, enum iommu_dma_owner owner) { } + +static inline int iommu_group_set_dma_owner(struct iommu_group *group, + enum iommu_dma_owner owner, + struct file *user_file) +{ + return -EINVAL; +} + +static inline void iommu_group_release_dma_owner(struct iommu_group *group, + enum iommu_dma_owner owner) +{ +} + +static inline bool iommu_group_dma_owner_unclaimed(struct iommu_group *group) +{ + return false; +} #endif /* CONFIG_IOMMU_API */ /** diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 916a4d448150..3dcd3fc4290a 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -3431,6 +3431,63 @@ static void __iommu_group_release_dma_owner(struct iommu_group *group, } } +/** + * iommu_group_set_dma_owner() - Set DMA ownership of a group + * @group: The group. + * @owner: DMA_OWNER_KERNEL or DMA_OWNER_USER. + * @user_file: The device fd when set USER ownership. + * + * This is to support backward compatibility for legacy vfio which manages + * dma ownership in group level. New invocations on this interface should be + * prohibited. Instead, please turn to iommu_device_set_dma_owner(). + */ +int iommu_group_set_dma_owner(struct iommu_group *group, enum iommu_dma_owner owner, + struct file *user_file) +{ + int ret; + + mutex_lock(&group->mutex); + ret = __iommu_group_set_dma_owner(group, owner, user_file); + mutex_unlock(&group->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(iommu_group_set_dma_owner); + +/** + * iommu_group_release_dma_owner() - Release DMA ownership of a group + * @group: The group. + * @owner: DMA_OWNER_KERNEL or DMA_OWNER_USER. + * + * Release the DMA ownership claimed by iommu_group_set_dma_owner(). + */ +void iommu_group_release_dma_owner(struct iommu_group *group, enum iommu_dma_owner owner) +{ + mutex_lock(&group->mutex); + __iommu_group_release_dma_owner(group, owner); + mutex_unlock(&group->mutex); +} +EXPORT_SYMBOL_GPL(iommu_group_release_dma_owner); + +/** + * iommu_group_dma_owner_unclaimed() - Is group dma ownership claimed + * @group: The group. + * + * This provides status check on a given group. It is racey and only for + * non-binding status reporting. + */ +bool iommu_group_dma_owner_unclaimed(struct iommu_group *group) +{ + enum iommu_dma_owner owner; + + mutex_lock(&group->mutex); + owner = group->dma_owner; + mutex_unlock(&group->mutex); + + return owner == DMA_OWNER_NONE; +} +EXPORT_SYMBOL_GPL(iommu_group_dma_owner_unclaimed); + /** * iommu_device_set_dma_owner() - Set DMA ownership of a device * @dev: The device.