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=-9.8 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 0FF99C55181 for ; Tue, 21 Apr 2020 18:47:02 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EB557206E9 for ; Tue, 21 Apr 2020 18:47:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EB557206E9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id B6DED86EB2; Tue, 21 Apr 2020 18:47:01 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mlKfMs4iUFFd; Tue, 21 Apr 2020 18:46:59 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id AC66586D91; Tue, 21 Apr 2020 18:46:57 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 9D4BBC1D92; Tue, 21 Apr 2020 18:46:57 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id E4817C0175 for ; Tue, 21 Apr 2020 18:46:56 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id D3CA2203F2 for ; Tue, 21 Apr 2020 18:46:56 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dvWgDmg+3jSG for ; Tue, 21 Apr 2020 18:46:56 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by silver.osuosl.org (Postfix) with ESMTPS id D2B6920356 for ; Tue, 21 Apr 2020 18:46:55 +0000 (UTC) IronPort-SDR: 3fUkk0miJBp/EmImk3Q8lzCrvkK8UW33oxRIeV9tfLd2vFlISp8j2cMYdgHeFVdkjCJiD4JbN2 PlN8e8GRxsIw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2020 11:46:48 -0700 IronPort-SDR: OgETf1UfYuKpsNW4x9/79QHlGOz1Irm6c5lqGm2sWcQAb6JK5WIsnQ8g3OezoehAgiXE+vzLSz 1/b8Vhk49iYw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,411,1580803200"; d="scan'208";a="334367866" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga001.jf.intel.com with ESMTP; 21 Apr 2020 11:46:48 -0700 From: Jacob Pan To: "Lu Baolu" , iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Jean-Philippe Brucker , Eric Auger Subject: [PATCH v12 2/8] iommu/vt-d: Use a helper function to skip agaw for SL Date: Tue, 21 Apr 2020 11:52:39 -0700 Message-Id: <1587495165-80096-3-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1587495165-80096-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1587495165-80096-1-git-send-email-jacob.jun.pan@linux.intel.com> Cc: "Tian, Kevin" , Raj Ashok , Christoph Hellwig , Alex Williamson , Jonathan Cameron 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: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" An Intel iommu domain uses 5-level page table by default. If the iommu that the domain tries to attach supports less page levels, the top level page tables should be skipped. Add a helper to do this so that it could be used in other places. Signed-off-by: Jacob Pan Reviewed-by: Eric Auger --- drivers/iommu/intel-pasid.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c index 22b30f10b396..d9cea3011b58 100644 --- a/drivers/iommu/intel-pasid.c +++ b/drivers/iommu/intel-pasid.c @@ -500,6 +500,25 @@ 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; + } + + return agaw; +} + +/* * Set up the scalable mode pasid entry for second only translation type. */ int intel_pasid_setup_second_level(struct intel_iommu *iommu, @@ -522,17 +541,11 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu, return -EINVAL; } - /* - * Skip top levels of page tables for iommu which has less agaw - * than default. Unnecessary for PT mode. - */ pgd = domain->pgd; - for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) { - pgd = phys_to_virt(dma_pte_addr(pgd)); - if (!dma_pte_present(pgd)) { - dev_err(dev, "Invalid domain page table\n"); - return -EINVAL; - } + agaw = iommu_skip_agaw(domain, iommu, &pgd); + if (agaw < 0) { + dev_err(dev, "Invalid domain page table\n"); + return -EINVAL; } pgd_val = virt_to_phys(pgd); -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu