From patchwork Tue Jul 28 13:46:12 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 501247 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 B2B2D140AF3 for ; Tue, 28 Jul 2015 23:52:35 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932364AbbG1Nqq (ORCPT ); Tue, 28 Jul 2015 09:46:46 -0400 Received: from foss.arm.com ([217.140.101.70]:59085 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932363AbbG1Nqo (ORCPT ); Tue, 28 Jul 2015 09:46:44 -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 CDF255CF; Tue, 28 Jul 2015 06:46:53 -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 7CD9D3F21A; Tue, 28 Jul 2015 06:46:42 -0700 (PDT) From: Marc Zyngier To: Bjorn Helgaas , Thomas Gleixner , Jiang Liu , Jason Cooper Cc: , , , Yijing Wang , Ma Jun , Lorenzo Pieralisi , Duc Dang , Hanjun Guo Subject: [PATCH v6 05/19] PCI/MSI: of: Add support for OF-provided msi_domain Date: Tue, 28 Jul 2015 14:46:12 +0100 Message-Id: <1438091186-10244-6-git-send-email-marc.zyngier@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1438091186-10244-1-git-send-email-marc.zyngier@arm.com> References: <1438091186-10244-1-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 In order to populate the PCI host bridge msi_domain, use the "msi-parent" attribute to lookup a corresponding irq domain. If found, this is our MSI domain. This gets plugged into the core PCI code. Acked-by: Bjorn Helgaas Signed-off-by: Marc Zyngier --- drivers/pci/of.c | 25 +++++++++++++++++++++++++ drivers/pci/probe.c | 5 ++++- include/linux/pci.h | 4 ++++ 3 files changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/pci/of.c b/drivers/pci/of.c index f092993..85844d8 100644 --- a/drivers/pci/of.c +++ b/drivers/pci/of.c @@ -9,6 +9,7 @@ * 2 of the License, or (at your option) any later version. */ +#include #include #include #include @@ -59,3 +60,27 @@ struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus) return of_node_get(bus->bridge->parent->of_node); return NULL; } + +struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) +{ +#ifdef CONFIG_IRQ_DOMAIN + struct device_node *np; + struct irq_domain *d; + + if (!bus->dev.of_node) + return NULL; + + /* Start looking for a phandle to an MSI controller. */ + np = of_parse_phandle(bus->dev.of_node, "msi-parent", 0); + if (!np) + return NULL; + + d = irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI); + if (d) + return d; + + return irq_find_host(np); +#else + return NULL; +#endif +} diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index c03ecbf..a7afeac 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -663,12 +663,15 @@ static void pci_set_bus_speed(struct pci_bus *bus) static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus) { + struct irq_domain *d; + /* * Any firmware interface that can resolve the msi_domain * should be called from here. */ + d = pci_host_bridge_of_msi_domain(bus); - return NULL; + return d; } static void pci_set_bus_msi_domain(struct pci_bus *bus) diff --git a/include/linux/pci.h b/include/linux/pci.h index fbf245f..772616d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1841,10 +1841,12 @@ int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off, /* PCI <-> OF binding helpers */ #ifdef CONFIG_OF struct device_node; +struct irq_domain; void pci_set_of_node(struct pci_dev *dev); void pci_release_of_node(struct pci_dev *dev); void pci_set_bus_of_node(struct pci_bus *bus); void pci_release_bus_of_node(struct pci_bus *bus); +struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus); /* Arch may override this (weak) */ struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus); @@ -1867,6 +1869,8 @@ static inline void pci_set_bus_of_node(struct pci_bus *bus) { } static inline void pci_release_bus_of_node(struct pci_bus *bus) { } static inline struct device_node * pci_device_to_OF_node(const struct pci_dev *pdev) { return NULL; } +static inline struct irq_domain * +pci_host_bridge_of_msi_domain(struct pci_bus *bus) { return NULL; } #endif /* CONFIG_OF */ #ifdef CONFIG_EEH