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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D099DC04EB8 for ; Wed, 12 Dec 2018 05:46:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9307B20811 for ; Wed, 12 Dec 2018 05:46:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="QlIG4Ltx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9307B20811 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726565AbeLLFqx (ORCPT ); Wed, 12 Dec 2018 00:46:53 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:42694 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726434AbeLLFqv (ORCPT ); Wed, 12 Dec 2018 00:46:51 -0500 Received: by mail-wr1-f68.google.com with SMTP id q18so16339477wrx.9 for ; Tue, 11 Dec 2018 21:46:48 -0800 (PST) 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=o9zOKa7UZo6O1oSXPaMqPu6Fib6WbxYaMCsnJYZwlo8=; b=QlIG4Ltxek1NO4qTDSHC89YHHCe0sh1RmxOpdVMF0Otf8WCvUKyW9zfoBCzj5jJy1Z aRmRd7aLNA5vekwKNUtlK0IaM9Yv/gj9MEwrtjTg+JdtdrFOaDTMLbeauVSbxDKj1Syb HMgN+e8vXZT0sbLe38HQRH5SZ36vVljbjYyMw= 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=o9zOKa7UZo6O1oSXPaMqPu6Fib6WbxYaMCsnJYZwlo8=; b=oV2X69sZG4DD/Xx3MGTz+WicVjmBTzHobmDFqmN2DdDPMq0QACBihukmJV58aYb66s FL3//ZkXUAq6s4EF8P02eykPDtsH6AiIlkRYLhMQRybAHWkHnLmONoJT9dB2zSPTgxm0 ylsWpMJhcYiLOtVK34KaHQbLTIMQkr1getiLHwBlB92XHjQcwoCASOS1v5DwXMjWzihq zgIYc8/0lyeQAjcdTECUAhktU7UgUSR+ZkscVqpmD5D6NB0vzNPFlDjLtuGZjBF3b6JK N3R7WBoi3djyUaizwkenmccXug+B13Qy+koiCMzAtJyc6cEuiQXjZi2kKhcwDNzTVCpK Uefw== X-Gm-Message-State: AA+aEWbUtcXKYsRlh3CWMgTB4Q/TLWNM+tUg27FmRnaVPPm4xsZOY4co yjkqW1ZOriB0w9LvUpY7RRZ8uw== X-Google-Smtp-Source: AFSGD/W5fvf+7cGlVD1coGF/72gVx5nYO/sHP4U40r0vjs5KfAPR1WO+tTEdFzJ7o4gqCxb6UJXG6g== X-Received: by 2002:adf:ae41:: with SMTP id u1mr15101050wrd.20.1544593608138; Tue, 11 Dec 2018 21:46:48 -0800 (PST) Received: from mannams-OptiPlex-7010.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id z206sm2015947wmc.18.2018.12.11.21.46.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 11 Dec 2018 21:46:47 -0800 (PST) From: Srinath Mannam To: Bjorn Helgaas , Robin Murphy , Joerg Roedel , Lorenzo Pieralisi , 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: [RFC PATCH 3/3] PCI: iproc: Add dma reserve resources to host Date: Wed, 12 Dec 2018 11:16:09 +0530 Message-Id: <1544593569-8923-4-git-send-email-srinath.mannam@broadcom.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1544593569-8923-1-git-send-email-srinath.mannam@broadcom.com> References: <1544593569-8923-1-git-send-email-srinath.mannam@broadcom.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org IPROC host has the limitation that it can use only those address ranges given by dma-ranges property as inbound address. So that the memory address holes in dma-ranges should be reserved to allocate as DMA address. All such reserved addresses are created as resource entries and add to dma_resv list of pci host bridge. These dma reserve resources created by parsing dma-ranges parameter. Ex: dma-ranges = < \ 0x43000000 0x00 0x80000000 0x00 0x80000000 0x00 0x80000000 \ 0x43000000 0x08 0x00000000 0x08 0x00000000 0x08 0x00000000 \ 0x43000000 0x80 0x00000000 0x80 0x00000000 0x40 0x00000000> In the above example of dma-ranges, memory address from 0x0 - 0x80000000, 0x100000000 - 0x800000000, 0x1000000000 - 0x8000000000 and 0x10000000000 - 0xffffffffffffffff. are not allowed to use as inbound addresses. So that we need to add these address range to dma_resv list to reserve their IOVA address ranges. Signed-off-by: Srinath Mannam --- drivers/pci/controller/pcie-iproc.c | 49 +++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c index 3160e93..43e465a 100644 --- a/drivers/pci/controller/pcie-iproc.c +++ b/drivers/pci/controller/pcie-iproc.c @@ -1154,25 +1154,74 @@ static int iproc_pcie_setup_ib(struct iproc_pcie *pcie, return ret; } +static int +iproc_pcie_add_dma_resv_range(struct device *dev, struct list_head *resources, + uint64_t start, uint64_t end) +{ + struct resource *res; + + res = devm_kzalloc(dev, sizeof(struct resource), GFP_KERNEL); + if (!res) + return -ENOMEM; + + res->start = (resource_size_t)start; + res->end = (resource_size_t)end; + pci_add_resource_offset(resources, res, 0); + + return 0; +} + static int iproc_pcie_map_dma_ranges(struct iproc_pcie *pcie) { + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); struct of_pci_range range; struct of_pci_range_parser parser; int ret; + uint64_t start, end; + LIST_HEAD(resources); /* Get the dma-ranges from DT */ ret = of_pci_dma_range_parser_init(&parser, pcie->dev->of_node); if (ret) return ret; + start = 0; for_each_of_pci_range(&parser, &range) { + end = range.pci_addr; + /* dma-ranges list expected in sorted order */ + if (end < start) { + ret = -EINVAL; + goto out; + } /* Each range entry corresponds to an inbound mapping region */ ret = iproc_pcie_setup_ib(pcie, &range, IPROC_PCIE_IB_MAP_MEM); if (ret) return ret; + + if (end - start) { + ret = iproc_pcie_add_dma_resv_range(pcie->dev, + &resources, + start, end); + if (ret) + goto out; + } + start = range.pci_addr + range.size; } + end = ~0; + if (end - start) { + ret = iproc_pcie_add_dma_resv_range(pcie->dev, &resources, + start, end); + if (ret) + goto out; + } + + list_splice_init(&resources, &host->dma_resv); + return 0; +out: + pci_free_resource_list(&resources); + return ret; } static int iproce_pcie_get_msi(struct iproc_pcie *pcie, -- 2.7.4