From nobody Fri Dec 19 20:13:59 2025 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 ACC5CC433FE for ; Thu, 3 Nov 2022 06:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231297AbiKCGA6 (ORCPT ); Thu, 3 Nov 2022 02:00:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230500AbiKCGAb (ORCPT ); Thu, 3 Nov 2022 02:00:31 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CAF4192B8 for ; Wed, 2 Nov 2022 23:00:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667455229; x=1698991229; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QiRpo85cqFxjJ5iqjYeKDVL1Wbqll0BYbdczDs6g2tI=; b=LQI0xOI9afimDO727BrC7yvR9N/5/2QRDC2f6dIgF92DUuTcgidqPZMD N2jnwFjmgso5U/9n5eX0EmYtnSncZWXiErH3Ys+L4lDAm4Q6ZqmaDL4EA 25LFmu4XqrPZ/FL31LHMWXidPWiUUoAbsPcICzmrqcvNYGSfWDh4f+bFK SSNrRUImv/6bM7uTzDexaLwaiJs5hD6Q6kExvc3CZMVWFCndX3snZ5zKy rX37FUxaDqVaqyn6rSzt6OHqzJvmR2lxVQ7cDj1T0Vk8A5SL/Fzf8Xvdv 4Su6zIdCVbo+Tm0DDVCMn3jpi0SxG4c3XdNhz3e855iiIW9bWRzgH2kRv Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10519"; a="311322528" X-IronPort-AV: E=Sophos;i="5.95,235,1661842800"; d="scan'208";a="311322528" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2022 23:00:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10519"; a="723819324" X-IronPort-AV: E=Sophos;i="5.95,235,1661842800"; d="scan'208";a="723819324" Received: from allen-box.sh.intel.com ([10.239.159.48]) by FMSMGA003.fm.intel.com with ESMTP; 02 Nov 2022 23:00:26 -0700 From: Lu Baolu To: iommu@lists.linux.dev Cc: Joerg Roedel , Kevin Tian , Will Deacon , Robin Murphy , Liu Yi L , Jacob jun Pan , linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 6/7] iommu/vt-d: Remove unnecessary domain_context_mapped() Date: Thu, 3 Nov 2022 13:53:28 +0800 Message-Id: <20221103055329.633052-7-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221103055329.633052-1-baolu.lu@linux.intel.com> References: <20221103055329.633052-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The device_domain_info::domain accurately records the domain attached to the device. It is unnecessary to check whether the context is present in the attach_dev path. Remove it to make the code neat. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian --- drivers/iommu/intel/iommu.c | 47 +++---------------------------------- 1 file changed, 3 insertions(+), 44 deletions(-) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 6ec5dd4e461b..5c7a574fad38 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -780,19 +780,6 @@ static void domain_flush_cache(struct dmar_domain *dom= ain, clflush_cache_range(addr, size); } =20 -static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 dev= fn) -{ - struct context_entry *context; - int ret =3D 0; - - spin_lock(&iommu->lock); - context =3D iommu_context_addr(iommu, bus, devfn, 0); - if (context) - ret =3D context_present(context); - spin_unlock(&iommu->lock); - return ret; -} - static void free_context_table(struct intel_iommu *iommu) { struct context_entry *context; @@ -2100,30 +2087,6 @@ domain_context_mapping(struct dmar_domain *domain, s= truct device *dev) &domain_context_mapping_cb, &data); } =20 -static int domain_context_mapped_cb(struct pci_dev *pdev, - u16 alias, void *opaque) -{ - struct intel_iommu *iommu =3D opaque; - - return !device_context_mapped(iommu, PCI_BUS_NUM(alias), alias & 0xff); -} - -static int domain_context_mapped(struct device *dev) -{ - struct intel_iommu *iommu; - u8 bus, devfn; - - iommu =3D device_to_iommu(dev, &bus, &devfn); - if (!iommu) - return -ENODEV; - - if (!dev_is_pci(dev)) - return device_context_mapped(iommu, bus, devfn); - - return !pci_for_each_dma_alias(to_pci_dev(dev), - domain_context_mapped_cb, iommu); -} - /* Returns a number of VTD pages, but aligned to MM page size */ static inline unsigned long aligned_nrpages(unsigned long host_addr, size_t size) @@ -4247,6 +4210,7 @@ static int prepare_domain_attach_device(struct iommu_= domain *domain, static int intel_iommu_attach_device(struct iommu_domain *domain, struct device *dev) { + struct device_domain_info *info =3D dev_iommu_priv_get(dev); int ret; =20 if (domain->type =3D=3D IOMMU_DOMAIN_UNMANAGED && @@ -4255,13 +4219,8 @@ static int intel_iommu_attach_device(struct iommu_do= main *domain, return -EPERM; } =20 - /* normally dev is not mapped */ - if (unlikely(domain_context_mapped(dev))) { - struct device_domain_info *info =3D dev_iommu_priv_get(dev); - - if (info->domain) - device_block_translation(dev); - } + if (info->domain) + device_block_translation(dev); =20 ret =3D prepare_domain_attach_device(domain, dev); if (ret) --=20 2.34.1