linux-kernel - [PATCH v10 15/29] PCI: Introduce new scan function pci_scan_host

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Message-ID: <1429616088-10249-16-git-send-email-wangyijing@huawei.com>
Date:	Tue, 21 Apr 2015 19:34:34 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Jiang Liu <jiang.liu@...ux.intel.com>, <linux-pci@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>, <dja@...ens.net>,
	<x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tony Luck <tony.luck@...el.com>, <linux-ia64@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Guan Xuetao" <gxt@...c.pku.edu.cn>, <linux-alpha@...r.kernel.org>,
	<linux-m68k@...ts.linux-m68k.org>, Liviu Dudau <liviu@...au.co.uk>,
	"Arnd Bergmann" <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"Yijing Wang" <wangyijing@...wei.com>
Subject: [PATCH v10 15/29] PCI: Introduce new scan function pci_scan_host_bridge()

Introduce new scan function pci_scan_host_bridge() to
support host bridge drivers that need to provide platform
own pci_host_bridge_ops.

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 drivers/pci/probe.c |   23 +++++++++++++++++++++++
 include/linux/pci.h |    3 +++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 83cf7c6..708bcf1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2064,6 +2064,29 @@ void pci_bus_release_busn_res(struct pci_bus *b)
 			res, ret ? "can not be" : "is");
 }
 
+struct pci_host_bridge *pci_scan_host_bridge(
+		struct device *parent, int domain,
+		void *sysdata, struct list_head *resources,
+		struct pci_host_bridge_ops *ops)
+{
+	struct pci_host_bridge *host;
+
+	host = pci_create_host_bridge(parent, domain, sysdata,
+			resources, ops);
+	if (!host)
+		return NULL;
+
+	host->bus = __pci_create_root_bus(host, ops->pci_ops);
+	if (!host->bus) {
+		pci_free_host_bridge(host);
+		return NULL;
+	}
+
+	pci_scan_child_bus(host->bus);
+	return host;
+}
+EXPORT_SYMBOL(pci_scan_host_bridge);
+
 struct pci_bus *pci_scan_root_bus(struct device *parent, int domain,
 		int bus, struct pci_ops *ops, void *sysdata,
 		struct list_head *resources)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 91fde6a..13edbf1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -796,6 +796,9 @@ void pci_bus_release_busn_res(struct pci_bus *b);
 struct pci_bus *pci_scan_root_bus(struct device *parent, int domain, int bus,
 					     struct pci_ops *ops, void *sysdata,
 					     struct list_head *resources);
+struct pci_host_bridge *pci_scan_host_bridge(struct device *parent,
+		int domain, void *sysdata, struct list_head *resources,
+		struct pci_host_bridge_ops *ops);
 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
 				int busnr);
 void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
-- 
1.7.1

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