From patchwork Fri May 5 11:57:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 758989 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3wK9Ps2ctqz9s8F for ; Fri, 5 May 2017 21:57:53 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=broadcom.com header.i=@broadcom.com header.b="AMm6GMnN"; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752207AbdEEL5i (ORCPT ); Fri, 5 May 2017 07:57:38 -0400 Received: from mail-qt0-f182.google.com ([209.85.216.182]:33888 "EHLO mail-qt0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752540AbdEEL5g (ORCPT ); Fri, 5 May 2017 07:57:36 -0400 Received: by mail-qt0-f182.google.com with SMTP id j29so2677339qtj.1 for ; Fri, 05 May 2017 04:57:36 -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=xj+GDn5nxpbshq0AYAKDOyi2//3l6UKIibbLtWvOQpw=; b=AMm6GMnNgzfz3S7eetmIZ5+u2hgGTawkz2ut0bzQr4ppgPC8fL/oyp+rzyN8vCv9tV Y4VjrQC2k06ytlncEbxkzyOR8g3HFubSIfnST+PTQ9RgRWxeGRPCR84nqnlUMmRACbmj 0ym4Q1gFCiEg7uRX8VC9pIMI2NDBIEyT6woAU= 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=xj+GDn5nxpbshq0AYAKDOyi2//3l6UKIibbLtWvOQpw=; b=F2niRmZhAx5wkxphGtOwzheNoWXJ/v7wcjv61Kd35KEUtlsOXMg8qO2VCrCqxi2sPv 6EoeHqK0w20JG6hJ0r5ljNZMoJl5hT3l4+7reDSBYS6AksZjOpiuV+IEZd1kfdNz0/8g vw3XAaMvO8NRhVHxvoRoaviNsZblqwol3xbLXrda53AmKf8xXRBeHN5+tJBUN7ZFaRfT hIswEkGxNPTx/Bnu6FEBMvi726Sz13UOmurAZdpF5O1ZMt2nIf/Vdquv+6u7Aylfg3Wf tIbMiZ2SF9KIU6ki8WrrkKZ1zQ+zxZxm8A4KosU2h1BSsJSre6g6npEsuVSqQjwbzO5m gUTQ== X-Gm-Message-State: AODbwcDX3VSLMWXFHRofPnSiYQKRK+g10sQoXJ6ZkP6eQDXhXSfC9ofR 2l4efkvweZTvxys2 X-Received: by 10.200.37.26 with SMTP id 26mr1486900qtm.278.1493985455596; Fri, 05 May 2017 04:57:35 -0700 (PDT) Received: from anjanavk-OptiPlex-7010.dhcp.avagotech.net ([192.19.237.250]) by smtp.gmail.com with ESMTPSA id q40sm4108386qtq.21.2017.05.05.04.57.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 05 May 2017 04:57:34 -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 3/3] PCI/of fix of_dma_get_range; get PCI specific dma-ranges Date: Fri, 5 May 2017 17:27:17 +0530 Message-Id: <1493985437-2748-3-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 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 fixes the bug in of_dma_get_range, which with as is, parses the PCI memory ranges and return wrong size as 0. in order to get largest possible dma_mask. this patch also retuns the largest possible size based on dma-ranges, for e.g. dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>; we should get dev->coherent_dma_mask=0x7fffffffff. based on which IOVA allocation space will honour PCI host bridge limitations. the implementation hooks bus specific callbacks for getting dma-ranges. Signed-off-by: Oza Pawandeep diff --git a/drivers/of/address.c b/drivers/of/address.c index 02b2903..cc0fc28 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -46,6 +47,8 @@ struct of_bus { int na, int ns, int pna); int (*translate)(__be32 *addr, u64 offset, int na); unsigned int (*get_flags)(const __be32 *addr); + int (*get_dma_ranges)(struct device_node *np, + u64 *dma_addr, u64 *paddr, u64 *size); }; /* @@ -171,6 +174,146 @@ static int of_bus_pci_translate(__be32 *addr, u64 offset, int na) { return of_bus_default_translate(addr + 1, offset, na - 1); } + +static int of_bus_pci_get_dma_ranges(struct device_node *np, u64 *dma_addr, + u64 *paddr, u64 *size) +{ + struct device_node *node = of_node_get(np); + int ret = 0; + struct resource_entry *window; + LIST_HEAD(res); + + if (!node) + return -EINVAL; + + if (of_bus_pci_match(np)) { + *size = 0; + /* + * PCI dma-ranges is not mandatory property. + * many devices do no need to have it, since + * host bridge does not require inbound memory + * configuration or rather have design limitations. + * so we look for dma-ranges, if missing we + * just return the caller full size, and also + * no dma-ranges suggests that, host bridge allows + * whatever comes in, so we set dma_addr to 0. + */ + ret = of_pci_get_dma_ranges(np, &res); + if (!ret) { + resource_list_for_each_entry(window, &res) { + struct resource *res_dma = window->res; + + if (*size < resource_size(res_dma)) { + *dma_addr = res_dma->start - window->offset; + *paddr = res_dma->start; + *size = resource_size(res_dma); + } + } + } + pci_free_resource_list(&res); + + /* + * return the largest possible size, + * since PCI master allows everything. + */ + if (*size == 0) { + pr_debug("empty/zero size dma-ranges found for node(%s)\n", + np->full_name); + *size = DMA_BIT_MASK(sizeof(dma_addr_t) * 8) - 1; + *dma_addr = *paddr = 0; + ret = 0; + } + + pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", + *dma_addr, *paddr, *size); + } + + of_node_put(node); + + return ret; +} + +static int get_dma_ranges(struct device_node *np, u64 *dma_addr, + u64 *paddr, u64 *size) +{ + struct device_node *node = of_node_get(np); + const __be32 *ranges = NULL; + int len, naddr, nsize, pna; + int ret = 0; + u64 dmaaddr; + + if (!node) + return -EINVAL; + + while (1) { + naddr = of_n_addr_cells(node); + nsize = of_n_size_cells(node); + node = of_get_next_parent(node); + if (!node) + break; + + ranges = of_get_property(node, "dma-ranges", &len); + + /* Ignore empty ranges, they imply no translation required */ + if (ranges && len > 0) + break; + + /* + * At least empty ranges has to be defined for parent node if + * DMA is supported + */ + if (!ranges) + break; + } + + if (!ranges) { + pr_debug("no dma-ranges found for node(%s)\n", np->full_name); + ret = -ENODEV; + goto out; + } + + len /= sizeof(u32); + + pna = of_n_addr_cells(node); + + /* dma-ranges format: + * DMA addr : naddr cells + * CPU addr : pna cells + * size : nsize cells + */ + dmaaddr = of_read_number(ranges, naddr); + *paddr = of_translate_dma_address(np, ranges); + if (*paddr == OF_BAD_ADDR) { + pr_err("translation of DMA address(%pad) to CPU address failed node(%s)\n", + dma_addr, np->full_name); + ret = -EINVAL; + goto out; + } + *dma_addr = dmaaddr; + + *size = of_read_number(ranges + naddr + pna, nsize); + + pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", + *dma_addr, *paddr, *size); + +out: + of_node_put(node); + + return ret; +} + +static int of_bus_isa_get_dma_ranges(struct device_node *np, u64 *dma_addr, + u64 *paddr, u64 *size) +{ + return get_dma_ranges(np, dma_addr, paddr, size); +} + +static int of_bus_default_get_dma_ranges(struct device_node *np, u64 *dma_addr, + u64 *paddr, u64 *size) +{ + return get_dma_ranges(np, dma_addr, paddr, size); +} + #endif /* CONFIG_OF_ADDRESS_PCI */ #ifdef CONFIG_PCI @@ -424,6 +567,7 @@ static unsigned int of_bus_isa_get_flags(const __be32 *addr) .map = of_bus_pci_map, .translate = of_bus_pci_translate, .get_flags = of_bus_pci_get_flags, + .get_dma_ranges = of_bus_pci_get_dma_ranges, }, #endif /* CONFIG_OF_ADDRESS_PCI */ /* ISA */ @@ -435,6 +579,7 @@ static unsigned int of_bus_isa_get_flags(const __be32 *addr) .map = of_bus_isa_map, .translate = of_bus_isa_translate, .get_flags = of_bus_isa_get_flags, + .get_dma_ranges = of_bus_isa_get_dma_ranges, }, /* Default */ { @@ -445,6 +590,7 @@ static unsigned int of_bus_isa_get_flags(const __be32 *addr) .map = of_bus_default_map, .translate = of_bus_default_translate, .get_flags = of_bus_default_get_flags, + .get_dma_ranges = of_bus_default_get_dma_ranges, }, }; @@ -820,74 +966,20 @@ void __iomem *of_io_request_and_map(struct device_node *np, int index, * size : nsize cells * * It returns -ENODEV if "dma-ranges" property was not found - * for this device in DT. + * for this device in DT, except if PCI device then, dma-ranges + * can be optional property, and in that case returns size with + * entire host memory. */ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size) { - struct device_node *node = of_node_get(np); - const __be32 *ranges = NULL; - int len, naddr, nsize, pna; - int ret = 0; - u64 dmaaddr; - - if (!node) - return -EINVAL; - - while (1) { - naddr = of_n_addr_cells(node); - nsize = of_n_size_cells(node); - node = of_get_next_parent(node); - if (!node) - break; - - ranges = of_get_property(node, "dma-ranges", &len); - - /* Ignore empty ranges, they imply no translation required */ - if (ranges && len > 0) - break; - - /* - * At least empty ranges has to be defined for parent node if - * DMA is supported - */ - if (!ranges) - break; - } - - if (!ranges) { - pr_debug("no dma-ranges found for node(%s)\n", np->full_name); - ret = -ENODEV; - goto out; - } - - len /= sizeof(u32); - - pna = of_n_addr_cells(node); - - /* dma-ranges format: - * DMA addr : naddr cells - * CPU addr : pna cells - * size : nsize cells - */ - dmaaddr = of_read_number(ranges, naddr); - *paddr = of_translate_dma_address(np, ranges); - if (*paddr == OF_BAD_ADDR) { - pr_err("translation of DMA address(%pad) to CPU address failed node(%s)\n", - dma_addr, np->full_name); - ret = -EINVAL; - goto out; - } - *dma_addr = dmaaddr; - - *size = of_read_number(ranges + naddr + pna, nsize); - - pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", - *dma_addr, *paddr, *size); + struct of_bus *bus; -out: - of_node_put(node); + /* get bus specific dma-ranges. */ + bus = of_match_bus(np); + if (bus->get_dma_ranges) + return bus->get_dma_ranges(np, dma_addr, paddr, size); - return ret; + return 0; } EXPORT_SYMBOL_GPL(of_dma_get_range);