From patchwork Wed May 29 05:32:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 13677849 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 90D21C25B75 for ; Wed, 29 May 2024 05:36:30 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 96562113034; Wed, 29 May 2024 05:36:27 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="G3+6zYeD"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4B56D113034 for ; Wed, 29 May 2024 05:36:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1716960974; x=1748496974; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xf05GvXEO+I215J3GQWK9zqCkzSYPhbVb/+Tz/JkYCQ=; b=G3+6zYeD+mjYTJww6E/DHC/b4MF+jX+lJ8CbJKXyk5DakmL2zA2Szohs BBhsye2DWJ+rENNilYHsipZWVhcdfoJt5/twUADc5z1pgDuzW7b87gXdi NDum1WEg82K+/OBSlWy8MjvUkaz2ujU1LNW0OWG+NrkXKsEKeEHb0oc48 gxHCpXlyJui2owOIBjMuLgNYD6wQ4a17vEAfFKanE/2+7Bll+Xbfnb0F8 rkGmAQVCVTs4rRKjbmezEmRzUIKW3Cy3jKcSZGcIiqiJuWviA2jy96OZb 6zepFmDhyHHauoj7Yj9A5XTfW/4mLjCZkp212Uk0/6jm7SVVxHwAt2H5c w==; X-CSE-ConnectionGUID: 1g5a3aJAQxGajdYmj16plg== X-CSE-MsgGUID: Bmtxo+3wR3iWSQyw5rNwiQ== X-IronPort-AV: E=McAfee;i="6600,9927,11085"; a="13568829" X-IronPort-AV: E=Sophos;i="6.08,197,1712646000"; d="scan'208";a="13568829" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2024 22:35:25 -0700 X-CSE-ConnectionGUID: WkFEj6PrQYqnAeoLtI1GfQ== X-CSE-MsgGUID: eszOZrvySa+kJnN3MKgnnw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,197,1712646000"; d="scan'208";a="35257546" Received: from unknown (HELO allen-box.sh.intel.com) ([10.239.159.127]) by fmviesa007.fm.intel.com with ESMTP; 28 May 2024 22:35:20 -0700 From: Lu Baolu To: Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe , Kevin Tian Cc: Yi Liu , David Airlie , Daniel Vetter , Kalle Valo , Bjorn Andersson , Mathieu Poirier , Alex Williamson , mst@redhat.com, Jason Wang , Thierry Reding , Jonathan Hunter , Mikko Perttunen , iommu@lists.linux.dev, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 05/20] iommu: Add iommu_paging_domain_alloc() interface Date: Wed, 29 May 2024 13:32:35 +0800 Message-Id: <20240529053250.91284-6-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240529053250.91284-1-baolu.lu@linux.intel.com> References: <20240529053250.91284-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from bus. The iommu subsystem no longer relies on bus for operations. So the bus parameter in iommu_domain_alloc() is no longer relevant. Add a new interface named iommu_paging_domain_alloc(), which explicitly indicates the allocation of a paging domain for DMA managed by a kernel driver. The new interface takes a device pointer as its parameter, that better aligns with the current iommu subsystem. Signed-off-by: Lu Baolu --- include/linux/iommu.h | 6 ++++++ drivers/iommu/iommu.c | 20 ++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 6648b2415474..16401de7802d 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -781,6 +781,7 @@ extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap); extern bool iommu_group_has_isolated_msi(struct iommu_group *group); extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus); struct iommu_domain *iommu_user_domain_alloc(struct device *dev, u32 flags); +struct iommu_domain *iommu_paging_domain_alloc(struct device *dev); extern void iommu_domain_free(struct iommu_domain *domain); extern int iommu_attach_device(struct iommu_domain *domain, struct device *dev); @@ -1092,6 +1093,11 @@ static inline struct iommu_domain *iommu_user_domain_alloc(struct device *dev, u return ERR_PTR(-ENODEV); } +static inline struct iommu_domain *iommu_paging_domain_alloc(struct device *dev) +{ + return ERR_PTR(-ENODEV); +} + static inline void iommu_domain_free(struct iommu_domain *domain) { } diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index f1416892ef8e..7df4a021b040 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2016,6 +2016,10 @@ static int __iommu_domain_alloc_dev(struct device *dev, void *data) return 0; } +/* + * The iommu ops in bus has been retired. Do not use this interface in + * new drivers. + */ struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus) { const struct iommu_ops *ops = NULL; @@ -2074,6 +2078,22 @@ struct iommu_domain *iommu_user_domain_alloc(struct device *dev, u32 flags) } EXPORT_SYMBOL_GPL(iommu_user_domain_alloc); +/** + * iommu_paging_domain_alloc() - Allocate a paging domain + * @dev: device for which the domain is allocated + * + * Allocate a paging domain which will be managed by a kernel driver. Return + * allocated domain if successful, or a ERR pointer for failure. + */ +struct iommu_domain *iommu_paging_domain_alloc(struct device *dev) +{ + if (!dev_has_iommu(dev)) + return ERR_PTR(-ENODEV); + + return __iommu_domain_alloc(dev_iommu_ops(dev), dev, IOMMU_DOMAIN_UNMANAGED); +} +EXPORT_SYMBOL_GPL(iommu_paging_domain_alloc); + void iommu_domain_free(struct iommu_domain *domain) { if (domain->type == IOMMU_DOMAIN_SVA)