From patchwork Fri Aug 18 10:10:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13357714 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D5A4C7113C for ; Fri, 18 Aug 2023 10:12:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359760AbjHRKMK (ORCPT ); Fri, 18 Aug 2023 06:12:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359844AbjHRKLv (ORCPT ); Fri, 18 Aug 2023 06:11:51 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6B2230C2; Fri, 18 Aug 2023 03:11:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1692353485; x=1723889485; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fe5keaRRZoV2YWbVwMtrDDrbxfsPkN3V0+LTY8Uy8EQ=; b=RenY9K2xP0zupbJxZv0zrWG7LYIV25nGzKKMIJUM7YwyW5JlGSHFjBXb 8l5ua5gMDT2WCIWXZ2462sAsclWnFcJ1R15dSBISLTdKqkyiZLMQr8dmQ kzRqutOEzZLLrL91/yrLnfnrsyq891BezavpzalCurougK72maa82Nh0Z sqzwV/4u9fVBFI/+i444nmg3CHpXv5YiJIlCSHBmZBUJU/ZqR29OM54aK q7iBM9/Aoi9BJBWMjWt9VgFMaeG+/juD0DwPO92CpDFOWyruoxAqN1Izi uniqaZnTDkVCKyTu02WnBHc6PkO1YtohsfLwsX6MJW4HJjGUONG4zhcBK g==; X-IronPort-AV: E=McAfee;i="6600,9927,10805"; a="370526291" X-IronPort-AV: E=Sophos;i="6.01,182,1684825200"; d="scan'208";a="370526291" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Aug 2023 03:10:36 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10805"; a="858624990" X-IronPort-AV: E=Sophos;i="6.01,182,1684825200"; d="scan'208";a="858624990" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga004.jf.intel.com with ESMTP; 18 Aug 2023 03:10:35 -0700 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com Subject: [PATCH v9 2/5] iommu: Add new iommu op to get iommu hardware information Date: Fri, 18 Aug 2023 03:10:30 -0700 Message-Id: <20230818101033.4100-3-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230818101033.4100-1-yi.l.liu@intel.com> References: <20230818101033.4100-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Lu Baolu Introduce a new iommu op to get the IOMMU hardware capabilities for iommufd. This information will be used by any vIOMMU driver which is owned by userspace. This op chooses to make the special parameters opaque to the core. This suits the current usage model where accessing any of the IOMMU device special parameters does require a userspace driver that matches the kernel driver. If a need for common parameters, implemented similarly by several drivers, arises then there's room in the design to grow a generic parameter set as well. No wrapper API is added as it is supposed to be used by iommufd only. Different IOMMU hardware would have different hardware information. So the information reported differs as well. To let the external user understand the difference, enum iommu_hw_info_type is defined. For the iommu drivers that are capable to report hardware information, it should have a unique iommu_hw_info_type and return to caller. For the driver doesn't report hardware information, caller just uses IOMMU_HW_INFO_TYPE_NONE if a type is required. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian Co-developed-by: Nicolin Chen Signed-off-by: Nicolin Chen Signed-off-by: Yi Liu --- include/linux/iommu.h | 5 +++++ include/uapi/linux/iommufd.h | 9 +++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index e0245aa82b75..bd6a1110b294 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -228,6 +228,10 @@ struct iommu_iotlb_gather { /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability + * @hw_info: report iommu hardware information. The data buffer returned by this + * op is allocated in the iommu driver and freed by the caller after + * use. The information type is one of enum iommu_hw_info_type defined + * in include/uapi/linux/iommufd.h. * @domain_alloc: allocate iommu domain * @probe_device: Add device to iommu driver handling * @release_device: Remove device from iommu driver handling @@ -257,6 +261,7 @@ struct iommu_iotlb_gather { */ struct iommu_ops { bool (*capable)(struct device *dev, enum iommu_cap); + void *(*hw_info)(struct device *dev, u32 *length, u32 *type); /* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 8245c01adca6..ac11ace21edb 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -370,4 +370,13 @@ struct iommu_hwpt_alloc { __u32 __reserved; }; #define IOMMU_HWPT_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_ALLOC) + +/** + * enum iommu_hw_info_type - IOMMU Hardware Info Types + * @IOMMU_HW_INFO_TYPE_NONE: Used by the drivers that do not report hardware + * info + */ +enum iommu_hw_info_type { + IOMMU_HW_INFO_TYPE_NONE, +}; #endif