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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 15221C433F4 for ; Tue, 14 Jul 2020 06:02:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E86C3221E7 for ; Tue, 14 Jul 2020 06:02:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726851AbgGNGCB (ORCPT ); Tue, 14 Jul 2020 02:02:01 -0400 Received: from mga03.intel.com ([134.134.136.65]:3745 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726820AbgGNGB7 (ORCPT ); Tue, 14 Jul 2020 02:01:59 -0400 IronPort-SDR: 9l8++kve+6QLYogvl0JoKe7YgS/6+iumvfZIyNsOKcuyNt/a4nr1ztYd8NH9XKWF82sU4XC+UI ek89B4FycrkA== X-IronPort-AV: E=McAfee;i="6000,8403,9681"; a="148812785" X-IronPort-AV: E=Sophos;i="5.75,350,1589266800"; d="scan'208";a="148812785" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Jul 2020 23:01:58 -0700 IronPort-SDR: rTEgJcSxIi++CMfnT+nngPUTP0N3kw4b1QGT3C0ZWXgc/CTL1WEwNKTMFvxK2405AHpjNDZaEM B0fV5qZj/pcA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,350,1589266800"; d="scan'208";a="324450203" Received: from allen-box.sh.intel.com ([10.239.159.139]) by FMSMGA003.fm.intel.com with ESMTP; 13 Jul 2020 23:01:55 -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 , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Lu Baolu Subject: [PATCH v3 3/4] iommu: Add iommu_aux_get_domain_for_dev() Date: Tue, 14 Jul 2020 13:57:02 +0800 Message-Id: <20200714055703.5510-4-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200714055703.5510-1-baolu.lu@linux.intel.com> References: <20200714055703.5510-1-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 Signed-off-by: Lu Baolu --- drivers/iommu/iommu.c | 18 ++++++++++++++++++ include/linux/iommu.h | 7 +++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index cad5a19ebf22..434bf42b6b9b 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2817,6 +2817,24 @@ void iommu_aux_detach_group(struct iommu_domain *domain, } EXPORT_SYMBOL_GPL(iommu_aux_detach_group); +struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *dev) +{ + struct iommu_domain *domain = NULL; + struct iommu_group *group; + + group = iommu_group_get(dev); + if (!group) + return NULL; + + if (group->aux_domain_attached) + 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 9506551139ab..cda6cef7579e 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -639,6 +639,7 @@ int iommu_aux_attach_group(struct iommu_domain *domain, struct iommu_group *group, struct device *dev); void iommu_aux_detach_group(struct iommu_domain *domain, struct iommu_group *group, struct device *dev); +struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *dev); struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, @@ -1040,6 +1041,12 @@ iommu_aux_detach_group(struct iommu_domain *domain, { } +static inline struct iommu_domain * +iommu_aux_get_domain_for_dev(struct device *dev) +{ + return NULL; +} + static inline struct iommu_sva * iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata) { -- 2.17.1