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 53AC8C433EB for ; Tue, 14 Jul 2020 06:02:04 +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 2E70721D93 for ; Tue, 14 Jul 2020 06:02:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E70721D93 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 123018B042; Tue, 14 Jul 2020 06:02:04 +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 pCqiFCsaA4Ag; Tue, 14 Jul 2020 06:02:01 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id E6EF88B039; Tue, 14 Jul 2020 06:02:01 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id BC869C0888; Tue, 14 Jul 2020 06:02:01 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 19D9CC0733 for ; Tue, 14 Jul 2020 06:02:00 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 0DADD8A6E1 for ; Tue, 14 Jul 2020 06:02:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VeaCGG+RqQMN for ; Tue, 14 Jul 2020 06:01:58 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by hemlock.osuosl.org (Postfix) with ESMTPS id BB2008A6D4 for ; Tue, 14 Jul 2020 06:01:58 +0000 (UTC) IronPort-SDR: mdhc0sLhyb8cjuMSP4Qmg9sovdfTfeeWgSZBAJE2vl9RJkypMqGbdCq3D6qs7zl12PvnP8S6bn xCVv5vc38IOQ== X-IronPort-AV: E=McAfee;i="6000,8403,9681"; a="147947588" X-IronPort-AV: E=Sophos;i="5.75,350,1589266800"; d="scan'208";a="147947588" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga103.fm.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 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> Cc: Jean-Philippe Brucker , Kevin Tian , Dave Jiang , Ashok Raj , kvm@vger.kernel.org, Cornelia Huck , linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Robin Murphy 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: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" 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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu