linux-kernel - [PATCH v6 13/30] PCI: Introduce new scan function pci_scan_host

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Message-ID: <1425868467-9667-14-git-send-email-wangyijing@huawei.com>
Date:	Mon, 9 Mar 2015 10:34:10 +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>, <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>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v6 13/30] 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>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/probe.c |   22 ++++++++++++++++++++++
 include/linux/pci.h |    4 ++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 59d9be3..99f17e3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2064,6 +2064,28 @@ static struct pci_bus *__pci_scan_root_bus(
 	return b;
 }
 
+struct pci_host_bridge *pci_scan_host_bridge(struct device *parent,
+		u32 db, struct pci_ops *ops, void *sysdata,
+		struct list_head *resources,
+		struct pci_host_bridge_ops *phb_ops)
+{
+	struct pci_host_bridge *host;
+	struct pci_bus *bus;
+
+	host = pci_create_host_bridge(parent, db, resources,
+			sysdata, phb_ops);
+	if (!host)
+		return NULL;
+
+	bus = __pci_scan_root_bus(host, ops);
+	if (!bus)
+		pci_free_host_bridge(host);
+
+	return host;
+}
+EXPORT_SYMBOL(pci_scan_host_bridge);
+
+
 struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db,
 		struct pci_ops *ops, void *sysdata, struct list_head *resources)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e9922b1..28eafb5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -790,6 +790,10 @@ void pci_bus_release_busn_res(struct pci_bus *b);
 struct pci_bus *pci_scan_root_bus(struct device *parent, u32 dombus,
 					     struct pci_ops *ops, void *sysdata,
 					     struct list_head *resources);
+struct pci_host_bridge *pci_scan_host_bridge(struct device *parent,
+		u32 dombus, struct pci_ops *ops, void *sysdata,
+		struct list_head *resources,
+		struct pci_host_bridge_ops *phb_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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