From patchwork Fri Aug 14 16:19:16 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 507503 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 D83F1140291 for ; Sat, 15 Aug 2015 02:22:34 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755514AbbHNQTb (ORCPT ); Fri, 14 Aug 2015 12:19:31 -0400 Received: from foss.arm.com ([217.140.101.70]:39252 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755104AbbHNQT3 (ORCPT ); Fri, 14 Aug 2015 12:19:29 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id ECE5A47D; Fri, 14 Aug 2015 09:19:24 -0700 (PDT) Received: from approximate.cambridge.arm.com (approximate.cambridge.arm.com [10.1.209.148]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1054A3F52A; Fri, 14 Aug 2015 09:19:26 -0700 (PDT) From: Marc Zyngier To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Will Deacon , Bjorn Helgaas , Suravee Suthikulpanit , Lorenzo Pieralisi , Grant Likely , Rob Herring Cc: Alexander Graf , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 1/4] of/pci: Add of_pci_check_probe_only to parse "linux, pci-probe-only" Date: Fri, 14 Aug 2015 17:19:16 +0100 Message-Id: <1439569159-10051-2-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1439569159-10051-1-git-send-email-marc.zyngier@arm.com> References: <1439569159-10051-1-git-send-email-marc.zyngier@arm.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Both pci-host-generic and Pseries parse the "linux,pci-probe-only" to engage the PCI_PROBE_ONLY mode, and both have a subtle bug that can be triggered if the property has no parameter. Provide a generic implementation that can be used by both. Signed-off-by: Marc Zyngier --- drivers/of/of_pci.c | 30 ++++++++++++++++++++++++++++++ include/linux/of_pci.h | 3 +++ 2 files changed, 33 insertions(+) diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 5751dc5..a4e29ff 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -118,6 +118,36 @@ int of_get_pci_domain_nr(struct device_node *node) EXPORT_SYMBOL_GPL(of_get_pci_domain_nr); /** + * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only + * is present and valid + * + * @node: device tree node that may contain the property (usually "chosen") + * + */ +void of_pci_check_probe_only(struct device_node *node) +{ + const int *prop; + int len; + + if (!node) + return; + + prop = of_get_property(node, "linux,pci-probe-only", &len); + if (prop) { + if (!len) { + pr_warn("linux,pci-probe-only set without value, ignoring\n"); + return; + } + + if (be32_to_cpup(prop)) + pci_add_flags(PCI_PROBE_ONLY); + else + pci_clear_flags(PCI_PROBE_ONLY); + } +} +EXPORT_SYMBOL_GPL(of_pci_check_probe_only); + +/** * of_pci_dma_configure - Setup DMA configuration * @dev: ptr to pci_dev struct of the PCI device * diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index 29fd3fe..4c0a617 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -17,6 +17,7 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin); int of_pci_parse_bus_range(struct device_node *node, struct resource *res); int of_get_pci_domain_nr(struct device_node *node); void of_pci_dma_configure(struct pci_dev *pci_dev); +void of_pci_check_probe_only(struct device_node *node); #else static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) { @@ -53,6 +54,8 @@ of_get_pci_domain_nr(struct device_node *node) } static inline void of_pci_dma_configure(struct pci_dev *pci_dev) { } + +static inline void of_pci_check_probe_only(struct device_node *node) { } #endif #if defined(CONFIG_OF_ADDRESS)