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=-12.7 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 4EB22C433E2 for ; Thu, 10 Sep 2020 10:44:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2476F206F4 for ; Thu, 10 Sep 2020 10:44:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729479AbgIJKoO (ORCPT ); Thu, 10 Sep 2020 06:44:14 -0400 Received: from mga06.intel.com ([134.134.136.31]:21877 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727087AbgIJKnu (ORCPT ); Thu, 10 Sep 2020 06:43:50 -0400 IronPort-SDR: hKtdbPmHB4Y97B9p/tPIsbS62W8Pt1km3K2nh9kA8kzZDEkAL5SjGsVCqa1SOd1rQrAl5fNzCP D11+s9UAcIzg== X-IronPort-AV: E=McAfee;i="6000,8403,9739"; a="220066281" X-IronPort-AV: E=Sophos;i="5.76,412,1592895600"; d="scan'208";a="220066281" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Sep 2020 03:43:34 -0700 IronPort-SDR: 73dx9X7Cnb17M8anIcZd15DZ6zk9OH5CW6ee4FBAD1QlJxzhVsyeh4B44sdn+/KUcdgKVjwNPx lmVkafq8WufA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,412,1592895600"; d="scan'208";a="334137183" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga008.jf.intel.com with ESMTP; 10 Sep 2020 03:43:34 -0700 From: Liu Yi L To: alex.williamson@redhat.com, eric.auger@redhat.com, baolu.lu@linux.intel.com, joro@8bytes.org Cc: kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, ashok.raj@intel.com, yi.l.liu@intel.com, jun.j.tian@intel.com, yi.y.sun@intel.com, jean-philippe@linaro.org, peterx@redhat.com, jasowang@redhat.com, hao.wu@intel.com, stefanha@gmail.com, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, Will Deacon , Robin Murphy Subject: [PATCH v7 02/16] iommu/smmu: Report empty domain nesting info Date: Thu, 10 Sep 2020 03:45:19 -0700 Message-Id: <1599734733-6431-3-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> References: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch is added as instead of returning a boolean for DOMAIN_ATTR_NESTING, iommu_domain_get_attr() should return an iommu_nesting_info handle. For now, return an empty nesting info struct for now as true nesting is not yet supported by the SMMUs. Cc: Will Deacon Cc: Robin Murphy Cc: Eric Auger Cc: Jean-Philippe Brucker Suggested-by: Jean-Philippe Brucker Signed-off-by: Liu Yi L Signed-off-by: Jacob Pan Reviewed-by: Eric Auger --- v5 -> v6: *) add review-by from Eric Auger. v4 -> v5: *) address comments from Eric Auger. --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 +++++++++++++++++++++++++++-- drivers/iommu/arm/arm-smmu/arm-smmu.c | 29 +++++++++++++++++++++++++++-- 2 files changed, 54 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 7196207..016e2e5 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3019,6 +3019,32 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev) return group; } +static int arm_smmu_domain_nesting_info(struct arm_smmu_domain *smmu_domain, + void *data) +{ + struct iommu_nesting_info *info = (struct iommu_nesting_info *)data; + unsigned int size; + + if (!info || smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED) + return -ENODEV; + + size = sizeof(struct iommu_nesting_info); + + /* + * if provided buffer size is smaller than expected, should + * return 0 and also the expected buffer size to caller. + */ + if (info->argsz < size) { + info->argsz = size; + return 0; + } + + /* report an empty iommu_nesting_info for now */ + memset(info, 0x0, size); + info->argsz = size; + return 0; +} + static int arm_smmu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr attr, void *data) { @@ -3028,8 +3054,7 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, case IOMMU_DOMAIN_UNMANAGED: switch (attr) { case DOMAIN_ATTR_NESTING: - *(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED); - return 0; + return arm_smmu_domain_nesting_info(smmu_domain, data); default: return -ENODEV; } diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index 09c42af9..368486f 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -1510,6 +1510,32 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev) return group; } +static int arm_smmu_domain_nesting_info(struct arm_smmu_domain *smmu_domain, + void *data) +{ + struct iommu_nesting_info *info = (struct iommu_nesting_info *)data; + unsigned int size; + + if (!info || smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED) + return -ENODEV; + + size = sizeof(struct iommu_nesting_info); + + /* + * if provided buffer size is smaller than expected, should + * return 0 and also the expected buffer size to caller. + */ + if (info->argsz < size) { + info->argsz = size; + return 0; + } + + /* report an empty iommu_nesting_info for now */ + memset(info, 0x0, size); + info->argsz = size; + return 0; +} + static int arm_smmu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr attr, void *data) { @@ -1519,8 +1545,7 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain, case IOMMU_DOMAIN_UNMANAGED: switch (attr) { case DOMAIN_ATTR_NESTING: - *(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED); - return 0; + return arm_smmu_domain_nesting_info(smmu_domain, data); default: return -ENODEV; } -- 2.7.4