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=-9.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,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 EB894C43219 for ; Wed, 1 May 2019 17:37:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B789920866 for ; Wed, 1 May 2019 17:37:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="CVI1N4Bl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726301AbfEARhM (ORCPT ); Wed, 1 May 2019 13:37:12 -0400 Received: from mail-ed1-f66.google.com ([209.85.208.66]:42139 "EHLO mail-ed1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726297AbfEARhM (ORCPT ); Wed, 1 May 2019 13:37:12 -0400 Received: by mail-ed1-f66.google.com with SMTP id l25so15478442eda.9 for ; Wed, 01 May 2019 10:37:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=3xPTSPJw6iXFSiPTAFBwEzjmdm3DJtxn26MyBE7/ci4=; b=CVI1N4BlG8HwXPhLobOU6JAKTbRtMIUjDK6ECuX9wHHKeV08OuvfPs7JCW/zhln6zx VeRfsSMzyuQzlAQP4XUJGGYxkwegvObFdmcJ7eXh2y4mdwktDgaPQY4+scz4a/eqMGMg IvcHOuRD+rxgwsloHSZJoKCD2uIgDL4cTg7Gg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=3xPTSPJw6iXFSiPTAFBwEzjmdm3DJtxn26MyBE7/ci4=; b=ujqkbNRlWSNUwnDMt+RdZ9nnchI2kbQKONGF0clw3X2/orshdK1A3uCY318tu5jHwF r0e1uI/H2Nuk9mmg2qCbBNIVrYjBdpwILkFvhqTtfL4e4MEoMIyTNjFKf2NYLhg43isP WIdDqI6Az/95K+IdNEif5rus7MsW7MPxKO4mpdLVbiN1XC56b5vPfjCwrxQptR8cb7YF Di7x4CuOWz3c9ekilxk1gkf8DQecgTYsLFkFOP12DVCFT68t9l3aToFNGpIXUV9atfgt VP2ZDFyDyRrtAWs+23xipovOJgw1tN67N8aOVIMLPzZO2VsYZSJ3fryou8BAqHV2XkMa kKeg== X-Gm-Message-State: APjAAAXMy94Ge5iDbSbZRBWYpV3tngbAwd5MBtXy1/B3YMb3vEdZdSp8 xniti5WHpQU5UD9cqdyvcrQbgw== X-Google-Smtp-Source: APXvYqxMHzoyOGYf0drHmb/y6wXO6syp/FMQbIZyj+iJbtVBJ6FIp7okadJfXPNtGbt+KmI0BUYQqA== X-Received: by 2002:a17:906:49c4:: with SMTP id w4mr34032869ejv.0.1556732230217; Wed, 01 May 2019 10:37:10 -0700 (PDT) Received: from mannams-OptiPlex-7010.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id s6sm2462671eji.13.2019.05.01.10.37.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 01 May 2019 10:37:09 -0700 (PDT) From: Srinath Mannam To: Bjorn Helgaas , Robin Murphy , Eric Auger , Joerg Roedel , Lorenzo Pieralisi , poza@codeaurora.org, Ray Jui Cc: bcm-kernel-feedback-list@broadcom.com, linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Srinath Mannam Subject: [PATCH v5 2/3] iommu/dma: Reserve IOVA for PCIe inaccessible DMA address Date: Wed, 1 May 2019 23:06:25 +0530 Message-Id: <1556732186-21630-3-git-send-email-srinath.mannam@broadcom.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1556732186-21630-1-git-send-email-srinath.mannam@broadcom.com> References: <1556732186-21630-1-git-send-email-srinath.mannam@broadcom.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org dma_ranges field of PCI host bridge structure has resource entries in sorted order of address range given through dma-ranges DT property. This list is the accessible DMA address range. So that this resource list will be processed and reserve IOVA address to the inaccessible address holes in the list. This method is similar to PCI IO resources address ranges reserving in IOMMU for each EP connected to host bridge. Signed-off-by: Srinath Mannam Based-on-patch-by: Oza Pawandeep Reviewed-by: Oza Pawandeep Acked-by: Robin Murphy --- drivers/iommu/dma-iommu.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 77aabe6..da94844 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -212,6 +212,7 @@ static void iova_reserve_pci_windows(struct pci_dev *dev, struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus); struct resource_entry *window; unsigned long lo, hi; + phys_addr_t start = 0, end; resource_list_for_each_entry(window, &bridge->windows) { if (resource_type(window->res) != IORESOURCE_MEM) @@ -221,6 +222,24 @@ static void iova_reserve_pci_windows(struct pci_dev *dev, hi = iova_pfn(iovad, window->res->end - window->offset); reserve_iova(iovad, lo, hi); } + + /* Get reserved DMA windows from host bridge */ + resource_list_for_each_entry(window, &bridge->dma_ranges) { + end = window->res->start - window->offset; +resv_iova: + if (end - start) { + lo = iova_pfn(iovad, start); + hi = iova_pfn(iovad, end); + reserve_iova(iovad, lo, hi); + } + start = window->res->end - window->offset + 1; + /* If window is last entry */ + if (window->node.next == &bridge->dma_ranges && + end != ~(dma_addr_t)0) { + end = ~(dma_addr_t)0; + goto resv_iova; + } + } } static int iova_reserve_iommu_regions(struct device *dev, -- 2.7.4