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 Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4F5CDC433F5 for ; Thu, 21 Apr 2022 05:24:25 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 056D560B15; Thu, 21 Apr 2022 05:24:25 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kWBxaAIQimV1; Thu, 21 Apr 2022 05:24:24 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp3.osuosl.org (Postfix) with ESMTPS id A8E1560EDE; Thu, 21 Apr 2022 05:24:23 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7B69BC002F; Thu, 21 Apr 2022 05:24:23 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [IPv6:2605:bc80:3010::137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8E695C002C for ; Thu, 21 Apr 2022 05:24:22 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 6D87941998 for ; Thu, 21 Apr 2022 05:24:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp4.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=intel.com Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XQVQU25DlN1v for ; Thu, 21 Apr 2022 05:24:21 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by smtp4.osuosl.org (Postfix) with ESMTPS id 66C4A4199F for ; Thu, 21 Apr 2022 05:24:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650518661; x=1682054661; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=oOm9XxSAvjsIn2c8MokEAyzVLqoj5HVQWpjQQnLfMOk=; b=QeWFdXK8gYIPCzlw8v3fAr+eyXWaVU3nwtvkIkHj0uZPyGQ5E/wuq1UZ HauOMZEAahbDN9h1WFInV4sZWtO/8S8WrzUgcTZPxPW5X2clUIxXR9bXx 3g6rYuvOKfkycO7uTMpGOyUuDBxMpqAL4T54zdgq+B3PcURhkI4IUfeqY DsH5Skstd4r6ziG5q+z6NFEcziTmATtV4WEye/owZ5+b+SF/jnS/txDB0 0pjSJ51YvXzmaqi+wfz7DNT4AGXIoitJn0PRVPDOQ3sASXEOyOyayHpQk c5Yq2TFKuZuXc1q9496RYjFliQ4zKPiUkpA/7qJNzAbiEui6hqQIELczQ g==; X-IronPort-AV: E=McAfee;i="6400,9594,10323"; a="244176708" X-IronPort-AV: E=Sophos;i="5.90,277,1643702400"; d="scan'208";a="244176708" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 22:24:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,277,1643702400"; d="scan'208";a="702944112" Received: from allen-box.sh.intel.com ([10.239.159.48]) by fmsmga001.fm.intel.com with ESMTP; 20 Apr 2022 22:24:18 -0700 From: Lu Baolu To: Joerg Roedel , Jason Gunthorpe , Christoph Hellwig , Kevin Tian , Ashok Raj , Will Deacon , Robin Murphy , Jean-Philippe Brucker Subject: [PATCH v4 04/12] iommu/sva: Basic data structures for SVA Date: Thu, 21 Apr 2022 13:21:13 +0800 Message-Id: <20220421052121.3464100-5-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220421052121.3464100-1-baolu.lu@linux.intel.com> References: <20220421052121.3464100-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Jacob jun Pan 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Use below data structures for SVA implementation in the IOMMU core: - struct iommu_sva_ioas Represent the I/O address space shared with an application CPU address space. This structure has a 1:1 relationship with an mm_struct. It grabs a "mm->mm_count" refcount during creation and drop it on release. - struct iommu_domain (IOMMU_DOMAIN_SVA type) Represent a hardware pagetable that the IOMMU hardware could use for SVA translation. Multiple iommu domains could be bound with an SVA ioas and each grabs a refcount from ioas in order to make sure ioas could only be freed after all domains have been unbound. - struct iommu_sva Represent a bond relationship between an SVA ioas and an iommu domain. If a bond already exists, it's reused and a reference is taken. Signed-off-by: Lu Baolu --- include/linux/iommu.h | 14 +++++++++++++- drivers/iommu/iommu-sva-lib.h | 1 + drivers/iommu/iommu-sva-lib.c | 18 ++++++++++++++++++ 3 files changed, 32 insertions(+), 1 deletion(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index fe7d9ee2bc2b..14c3b2197b35 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -42,6 +42,7 @@ struct notifier_block; struct iommu_sva; struct iommu_fault_event; struct iommu_dma_cookie; +struct iommu_sva_ioas; /* iommu fault flags */ #define IOMMU_FAULT_READ 0x0 @@ -64,6 +65,9 @@ struct iommu_domain_geometry { #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */ #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses flush queue */ +#define __IOMMU_DOMAIN_SHARED (1U << 4) /* Page table shared from CPU */ +#define __IOMMU_DOMAIN_HOST_VA (1U << 5) /* Host CPU virtual address */ + /* * This are the possible domain-types * @@ -86,6 +90,8 @@ struct iommu_domain_geometry { #define IOMMU_DOMAIN_DMA_FQ (__IOMMU_DOMAIN_PAGING | \ __IOMMU_DOMAIN_DMA_API | \ __IOMMU_DOMAIN_DMA_FQ) +#define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SHARED | \ + __IOMMU_DOMAIN_HOST_VA) struct iommu_domain { unsigned type; @@ -95,6 +101,7 @@ struct iommu_domain { void *handler_token; struct iommu_domain_geometry geometry; struct iommu_dma_cookie *iova_cookie; + struct iommu_sva_ioas *sva_ioas; }; static inline bool iommu_is_dma_domain(struct iommu_domain *domain) @@ -622,7 +629,12 @@ struct iommu_fwspec { * struct iommu_sva - handle to a device-mm bond */ struct iommu_sva { - struct device *dev; + struct device *dev; + struct iommu_sva_ioas *sva_ioas; + struct iommu_domain *domain; + /* Link to sva ioas's bonds list */ + struct list_head node; + refcount_t users; }; int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, diff --git a/drivers/iommu/iommu-sva-lib.h b/drivers/iommu/iommu-sva-lib.h index 8909ea1094e3..9c5e108e2c8a 100644 --- a/drivers/iommu/iommu-sva-lib.h +++ b/drivers/iommu/iommu-sva-lib.h @@ -10,6 +10,7 @@ int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t max); struct mm_struct *iommu_sva_find(ioasid_t pasid); +struct mm_struct *iommu_sva_domain_mm(struct iommu_domain *domain); /* I/O Page fault */ struct device; diff --git a/drivers/iommu/iommu-sva-lib.c b/drivers/iommu/iommu-sva-lib.c index 106506143896..d524a402be3b 100644 --- a/drivers/iommu/iommu-sva-lib.c +++ b/drivers/iommu/iommu-sva-lib.c @@ -3,6 +3,8 @@ * Helpers for IOMMU drivers implementing SVA */ #include +#include +#include #include #include "iommu-sva-lib.h" @@ -10,6 +12,22 @@ static DEFINE_MUTEX(iommu_sva_lock); static DECLARE_IOASID_SET(iommu_sva_pasid); +struct iommu_sva_ioas { + struct mm_struct *mm; + ioasid_t pasid; + + /* Counter of domains attached to this ioas. */ + refcount_t users; + + /* All bindings are linked here. */ + struct list_head bonds; +}; + +struct mm_struct *iommu_sva_domain_mm(struct iommu_domain *domain) +{ + return domain->sva_ioas->mm; +} + /** * iommu_sva_alloc_pasid - Allocate a PASID for the mm * @mm: the mm -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu