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Message-ID: <1425868467-9667-13-git-send-email-wangyijing@huawei.com>
Date: Mon, 9 Mar 2015 10:34:09 +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 12/30] PCI: Introduce pci_host_bridge_ops to support host specific operations
Now we have weak functions like pcibios_root_bridge_prepare()
to setup pci host bridge, We could introduce pci_host_bridge_ops
which contain host bridge specific ops to setup pci_host_bridge.
Then host bridge driver could add pci_host_bridge_ops hooks
intead of weak function to setup pci_host_bridge.
This patch add following pci_host_bridge_ops hooks:
pci_host_bridge_ops {
/* set root bus speed, some platform need this like powerpc */
void (*set_root_bus_speed)(struct pci_host_bridge *host);
/* setup pci_host_bridge before pci_host_bridge be added to driver core */
int (*prepare)(struct pci_host_bridge *host);
/* platform specific of scan hook to scan pci device */
void (*scan_bus)(struct pci_host_bridge *);
}
We could easily extend it to support different host bridge
specific operations.
Signed-off-by: Yijing Wang <wangyijing@...wei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
drivers/pci/host-bridge.c | 12 ++++++++++--
drivers/pci/pci.h | 4 ++--
drivers/pci/probe.c | 17 +++++++++++------
include/linux/pci.h | 8 ++++++++
4 files changed, 31 insertions(+), 10 deletions(-)
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 3c34c49..bc1de59 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c
@@ -23,8 +23,8 @@ static void pci_release_host_bridge_dev(struct device *dev)
}
struct pci_host_bridge *pci_create_host_bridge(
- struct device *parent, u32 db,
- struct list_head *resources, void *sysdata)
+ struct device *parent, u32 db, struct list_head *resources,
+ void *sysdata, struct pci_host_bridge_ops *ops)
{
int error;
int bus = PCI_BUSNUM(db);
@@ -56,6 +56,7 @@ struct pci_host_bridge *pci_create_host_bridge(
}
mutex_unlock(&phb_mutex);
+ host->ops = ops;
host->dev.parent = parent;
INIT_LIST_HEAD(&host->windows);
host->dev.release = pci_release_host_bridge_dev;
@@ -63,6 +64,13 @@ struct pci_host_bridge *pci_create_host_bridge(
dev_set_name(&host->dev, "pci%04x:%02x", host->domain,
host->busnum);
+ if (host->ops && host->ops->prepare) {
+ error = host->ops->prepare(host);
+ if (error) {
+ kfree(host);
+ return NULL;
+ }
+ }
error = device_register(&host->dev);
if (error) {
put_device(&host->dev);
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 79a8894..a1dc9f2 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -324,8 +324,8 @@ static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe)
#endif
struct pci_host_bridge *pci_create_host_bridge(
- struct device *parent, u32 dombus,
- struct list_head *resources, void *sysdata);
+ struct device *parent, u32 dombus, struct list_head *resources,
+ void *sysdata, struct pci_host_bridge_ops *ops);
void pci_free_host_bridge(struct pci_host_bridge *host);
#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index c8e074d..59d9be3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1889,6 +1889,8 @@ static struct pci_bus *__pci_create_root_bus(
bridge->bus = b;
b->bridge = get_device(&bridge->dev);
+ if (bridge->ops && bridge->ops->set_root_bus_speed)
+ bridge->ops->set_root_bus_speed(bridge);
error = pcibios_root_bridge_prepare(bridge);
if (error)
goto err_out;
@@ -1954,7 +1956,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, u32 db,
{
struct pci_host_bridge *host;
- host = pci_create_host_bridge(parent, db, resources, sysdata);
+ host = pci_create_host_bridge(parent, db, resources, sysdata, NULL);
if (!host)
return NULL;
@@ -2051,10 +2053,13 @@ static struct pci_bus *__pci_scan_root_bus(
pci_bus_insert_busn_res(b, b->number, 255);
}
- max = pci_scan_child_bus(b);
-
- if (!found)
- pci_bus_update_busn_res_end(b, max);
+ if (host->ops && host->ops->scan_bus) {
+ host->ops->scan_bus(host);
+ } else {
+ max = pci_scan_child_bus(b);
+ if (!found)
+ pci_bus_update_busn_res_end(b, max);
+ }
return b;
}
@@ -2064,7 +2069,7 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db,
{
struct pci_host_bridge *host;
- host = pci_create_host_bridge(parent, db, resources, sysdata);
+ host = pci_create_host_bridge(parent, db, resources, sysdata, NULL);
if (!host)
return NULL;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index b621f5b..e9922b1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -400,6 +400,13 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
return (pdev->error_state != pci_channel_io_normal);
}
+struct pci_host_bridge;
+struct pci_host_bridge_ops {
+ void (*set_root_bus_speed)(struct pci_host_bridge *host);
+ int (*prepare)(struct pci_host_bridge *host);
+ void (*scan_bus)(struct pci_host_bridge *);
+};
+
struct pci_host_bridge {
u16 domain;
u16 busnum;
@@ -407,6 +414,7 @@ struct pci_host_bridge {
struct pci_bus *bus; /* root bus */
struct list_head windows; /* resource_entry */
struct list_head list;
+ struct pci_host_bridge_ops *ops;
void (*release_fn)(struct pci_host_bridge *);
void *release_data;
};
--
1.7.1
--
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