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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 C0B83C4332D for ; Fri, 20 Mar 2020 23:22:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A42462078B for ; Fri, 20 Mar 2020 23:22:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727546AbgCTXWD (ORCPT ); Fri, 20 Mar 2020 19:22:03 -0400 Received: from mga18.intel.com ([134.134.136.126]:42258 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgCTXWC (ORCPT ); Fri, 20 Mar 2020 19:22:02 -0400 IronPort-SDR: kRcmsuzTTFKgTZBd1F1rAFYMVLcuitZAlSYuB0LzdazUJHjtMBlT4lkapr6EaDJqUHhbn5e9Di SSgWdeSVB+rQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Mar 2020 16:22:01 -0700 IronPort-SDR: zm8+sqo2Y4c3rylIhy759Oscrl2radw/23Wj1LvZqvMxCGDwCLVpDbxwITPW4onYclC77fAA2Y sAvTh6XGuy3g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,286,1580803200"; d="scan'208";a="418877227" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga005.jf.intel.com with ESMTP; 20 Mar 2020 16:22:01 -0700 From: Jacob Pan To: "Lu Baolu" , iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Alex Williamson , Jean-Philippe Brucker Cc: "Yi Liu" , "Tian, Kevin" , Raj Ashok , "Christoph Hellwig" , Jonathan Cameron , Eric Auger , Jacob Pan Subject: [PATCH V10 03/11] iommu/vt-d: Add a helper function to skip agaw Date: Fri, 20 Mar 2020 16:27:33 -0700 Message-Id: <1584746861-76386-4-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1584746861-76386-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1584746861-76386-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Jacob Pan --- drivers/iommu/intel-pasid.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c index 22b30f10b396..191508c7c03e 100644 --- a/drivers/iommu/intel-pasid.c +++ b/drivers/iommu/intel-pasid.c @@ -500,6 +500,28 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu, } /* + * Skip top levels of page tables for iommu which has less agaw + * than default. Unnecessary for PT mode. + */ +static inline int iommu_skip_agaw(struct dmar_domain *domain, + struct intel_iommu *iommu, + struct dma_pte **pgd) +{ + int agaw; + + for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) { + *pgd = phys_to_virt(dma_pte_addr(*pgd)); + if (!dma_pte_present(*pgd)) { + return -EINVAL; + } + } + pr_debug_ratelimited("%s: pgd: %llx, agaw %d d_agaw %d\n", __func__, (u64)*pgd, + iommu->agaw, domain->agaw); + + return agaw; +} + +/* * Set up the scalable mode pasid entry for second only translation type. */ int intel_pasid_setup_second_level(struct intel_iommu *iommu, -- 2.7.4