From patchwork Fri May 5 11:57:16 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 9713433 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0CB5760235 for ; Fri, 5 May 2017 11:58:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F316128693 for ; Fri, 5 May 2017 11:58:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E7C4628698; Fri, 5 May 2017 11:58:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 39B8228693 for ; Fri, 5 May 2017 11:58:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752297AbdEEL5f (ORCPT ); Fri, 5 May 2017 07:57:35 -0400 Received: from mail-qt0-f173.google.com ([209.85.216.173]:34927 "EHLO mail-qt0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752175AbdEEL5c (ORCPT ); Fri, 5 May 2017 07:57:32 -0400 Received: by mail-qt0-f173.google.com with SMTP id n4so2651544qte.2 for ; Fri, 05 May 2017 04:57:31 -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=s44PEUN7W5GL2HGArDHOrncdGwf7XdD3h/YIPUfjo6s=; b=EZfFn/mdjm7cVnxcOYhd4sziYQiIoOrzuP/jw3DjqaPFBh+cvCCnoNzcgh6k3rWcZr u2gySwmR2jQK6Dm8HGde/FiPyuLgV63VIRlNKgvF5JOWsp2sEbiKh9Z+PCB4ETWl/PKO 1opNBmIXxgQxWJRFrq22+M5KoIBzucTF/cTl4= 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=s44PEUN7W5GL2HGArDHOrncdGwf7XdD3h/YIPUfjo6s=; b=nUDuz+9Ts8SD5b7jBimlDnHf84z16Psf1d36FmofwchzBJ4zDUE6Q0V55QDN/PlmA2 5l6gk4Qcmi4fYwYNvivdpFrNqzdSK4G3H8NVLG267G4yrem3GHVLdau6ReULbZqgZkyG Uc+J/Lm8d7gSR/THlBcmK/F+CDkQKPrSTBwbL4PqWmulhLzvONBelm5tRH+OzQFbQRL7 9f7K4T5lA5d/UGfr/mveGShs0qYfXGiBKweLLzf8ZyELNL9dhmyLbJ07LKhAJr+9ddbc xuzQzUzA6l6eBAlOgvQr5zrER+Mto2bZzG+K5a4GtK5/MlfqVBG1OQneUZvAFXrSPFbQ gssA== X-Gm-Message-State: AN3rC/6ODvG7PiXjkqAALPz301eCJ8AbGCH4LPzK6ITPTmifzA6/YgpY RvFuEj3lk1S9elkh X-Received: by 10.237.51.226 with SMTP id v89mr27504153qtd.162.1493985451167; Fri, 05 May 2017 04:57:31 -0700 (PDT) Received: from anjanavk-OptiPlex-7010.dhcp.avagotech.net ([192.19.237.250]) by smtp.gmail.com with ESMTPSA id q40sm4108386qtq.21.2017.05.05.04.57.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 05 May 2017 04:57:30 -0700 (PDT) From: Oza Pawandeep To: Joerg Roedel , Robin Murphy Cc: iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, Oza Pawandeep , Oza Pawandeep Subject: [PATCH v3 1/3] of/pci/dma: fix DMA configuration for PCI masters Date: Fri, 5 May 2017 17:27:16 +0530 Message-Id: <1493985437-2748-2-git-send-email-oza.oza@broadcom.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1493985437-2748-1-git-send-email-oza.oza@broadcom.com> References: <1493985437-2748-1-git-send-email-oza.oza@broadcom.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP current device framework and OF framework integration assumes dma-ranges in a way where memory-mapped devices define their dma-ranges. (child-bus-address, parent-bus-address, length). of_dma_configure is specifically written to take care of memory mapped devices. but no implementation exists for pci to take care of pcie based memory ranges. for e.g. iproc based SOCs and other SOCs(suc as rcar) have PCI world dma-ranges. dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>; this patch serves following: 1) exposes interface to the pci host driver for their inbound memory ranges 2) provide an interface to callers such as of_dma_get_ranges. so then the returned size get best possible (largest) dma_mask. because PCI RC drivers do not call APIs such as dma_set_coherent_mask() and hence rather it shows its addressing capabilities based on dma-ranges. for e.g. dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>; we should get dev->coherent_dma_mask=0x7fffffffff. 3) this patch handles multiple inbound windows and dma-ranges. it is left to the caller, how it wants to use them. the new function returns the resources in a standard and unform way 4) this way the callers of for e.g. of_dma_get_ranges does not need to change. 5) leaves scope of adding PCI flag handling for inbound memory by the new function. Signed-off-by: Oza Pawandeep diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 0ee42c3..ed6e69a 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -283,6 +283,83 @@ int of_pci_get_host_bridge_resources(struct device_node *dev, return err; } EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources); + +/** + * of_pci_get_dma_ranges - Parse PCI host bridge inbound resources from DT + * @np: device node of the host bridge having the dma-ranges property + * @resources: list where the range of resources will be added after DT parsing + * + * It is the caller's job to free the @resources list. + * + * This function will parse the "dma-ranges" property of a + * PCI host bridge device node and setup the resource mapping based + * on its content. + * + * It returns zero if the range parsing has been successful or a standard error + * value if it failed. + */ + +int of_pci_get_dma_ranges(struct device_node *np, struct list_head *resources) +{ + struct device_node *node = of_node_get(np); + int rlen; + int ret = 0; + const int na = 3, ns = 2; + struct resource *res; + struct of_pci_range_parser parser; + struct of_pci_range range; + + if (!node) + return -EINVAL; + + parser.node = node; + parser.pna = of_n_addr_cells(node); + parser.np = parser.pna + na + ns; + + parser.range = of_get_property(node, "dma-ranges", &rlen); + + if (!parser.range) { + pr_debug("pcie device has no dma-ranges defined for node(%s)\n", + np->full_name); + ret = -EINVAL; + goto out; + } + + parser.end = parser.range + rlen / sizeof(__be32); + + for_each_of_pci_range(&parser, &range) { + /* + * If we failed translation or got a zero-sized region + * then skip this range + */ + if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) + continue; + + res = kzalloc(sizeof(struct resource), GFP_KERNEL); + if (!res) { + ret = -ENOMEM; + goto parse_failed; + } + + ret = of_pci_range_to_resource(&range, np, res); + if (ret) { + kfree(res); + continue; + } + + pci_add_resource_offset(resources, res, + res->start - range.pci_addr); + } + + return ret; + +parse_failed: + pci_free_resource_list(resources); +out: + of_node_put(node); + return ret; +} +EXPORT_SYMBOL_GPL(of_pci_get_dma_ranges); #endif /* CONFIG_OF_ADDRESS */ #ifdef CONFIG_PCI_MSI diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index 0e0974e..617b90d 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -76,6 +76,7 @@ static inline void of_pci_check_probe_only(void) { } int of_pci_get_host_bridge_resources(struct device_node *dev, unsigned char busno, unsigned char bus_max, struct list_head *resources, resource_size_t *io_base); +int of_pci_get_dma_ranges(struct device_node *np, struct list_head *resources); #else static inline int of_pci_get_host_bridge_resources(struct device_node *dev, unsigned char busno, unsigned char bus_max, @@ -83,6 +84,12 @@ static inline int of_pci_get_host_bridge_resources(struct device_node *dev, { return -EINVAL; } + +static inline int of_pci_get_dma_ranges(struct device_node *np, + struct list_head *resources) +{ + return -EINVAL; +} #endif #if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI)