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=-12.8 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=ham 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 74047C4363D for ; Tue, 22 Sep 2020 06:17:08 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 14A0A23A9B for ; Tue, 22 Sep 2020 06:17:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 14A0A23A9B 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 fraxinus.osuosl.org (Postfix) with ESMTP id BC25885BAE; Tue, 22 Sep 2020 06:17:07 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iHSiCRf3PI7z; Tue, 22 Sep 2020 06:17:06 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id E66DD85C37; Tue, 22 Sep 2020 06:17:06 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id D24C8C0859; Tue, 22 Sep 2020 06:17:06 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 26CFAC0051 for ; Tue, 22 Sep 2020 06:17:05 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 1646C85BEE for ; Tue, 22 Sep 2020 06:17:05 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i8-YkiF8DCl6 for ; Tue, 22 Sep 2020 06:17:04 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by fraxinus.osuosl.org (Postfix) with ESMTPS id E5B7685AE9 for ; Tue, 22 Sep 2020 06:17:03 +0000 (UTC) IronPort-SDR: u3k9+dvN+xBFunKwdMHsa3z1pJkqqmciVOH/dJTpapus8eI6dK3uK4niM4VD+OVr8PvhnF6fIM ZKruuFvGNy+Q== X-IronPort-AV: E=McAfee;i="6000,8403,9751"; a="148206702" X-IronPort-AV: E=Sophos;i="5.77,289,1596524400"; d="scan'208";a="148206702" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2020 23:17:03 -0700 IronPort-SDR: hQKOr7bsyk2kbpE/MSMW2jCpuIJ+taS5o6zMPkgn7nLLPKHCv2FzmQedp6g745cpQV3BGLRzPh MbY4N2n7c0Ng== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,289,1596524400"; d="scan'208";a="334877389" Received: from allen-box.sh.intel.com ([10.239.159.139]) by fmsmga004.fm.intel.com with ESMTP; 21 Sep 2020 23:17:00 -0700 From: Lu Baolu To: Joerg Roedel , Alex Williamson Subject: [PATCH v5 3/5] iommu: Add iommu_aux_get_domain_for_dev() Date: Tue, 22 Sep 2020 14:10:40 +0800 Message-Id: <20200922061042.31633-4-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200922061042.31633-1-baolu.lu@linux.intel.com> References: <20200922061042.31633-1-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 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 77f3a9fc4dfe..b6f24bf3bf87 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2905,6 +2905,24 @@ 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 4df17a8f4540..652549de388a 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) { -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu