[PATCH v8 06/30] PCI: Separate pci_host_bridge creation out of pci_create_root_bus()

Yijing Wang
2015-03-24T03:34:00Z

This patch separate pci_host_bridge creation out
of pci_create_root_bus(), and try to make a generic
pci_host_bridge, then we could make it hold host
bridge specific operations like
pcibios_root_bridge_prepare(). The changes are
transparent to platform host bridge drivers.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
---
drivers/pci/host-bridge.c | 52 +++++++++++++++++++++
drivers/pci/pci.h | 3 +
drivers/pci/probe.c | 113 +++++++++++++++++++++------------------------
3 files changed, 108 insertions(+), 60 deletions(-)

diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 39b2dbe..7d52a0a 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c
@@ -8,6 +8,58 @@

#include "pci.h"

+static void pci_release_host_bridge_dev(struct device *dev)
+{
+ struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
+
+ if (bridge->release_fn)
+ bridge->release_fn(bridge);
+
+ pci_free_resource_list(&bridge->windows);
+ kfree(bridge);
+}
+
+struct pci_host_bridge *pci_create_host_bridge(
+ struct device *parent, int domain, int bus,
+ struct list_head *resources)
+{
+ int error;
+ struct pci_host_bridge *host;
+ struct resource_entry *window, *n;
+
+ host = kzalloc(sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return NULL;
+
+ host->dev.parent = parent;
+ INIT_LIST_HEAD(&host->windows);
+ resource_list_for_each_entry_safe(window, n, resources)
+ list_move_tail(&window->node, &host->windows);
+ /*
+ * If support CONFIG_PCI_DOMAINS_GENERIC, use
+ * pci_host_assign_domain_nr() to update domain
+ * number.
+ */
+ host->domain = domain;
+ pci_host_assign_domain_nr(host);
+ host->dev.release = pci_release_host_bridge_dev;
+ dev_set_name(&host->dev, "pci%04x:%02x",
+ host->domain, bus);
+
+ error = device_register(&host->dev);
+ if (error) {
+ put_device(&host->dev);
+ return NULL;
+ }
+
+ return host;
+}
+
+void pci_free_host_bridge(struct pci_host_bridge *host)
+{
+ device_unregister(&host->dev);
+}
+
static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
{
while (bus->parent)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 1d3d2d1..8526790 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -334,4 +334,7 @@ static inline void pci_host_assign_domain_nr(struct pci_host_bridge *host)
}
#endif

+struct pci_host_bridge *pci_create_host_bridge(struct device *parent,
+ int domain, int bus, struct list_head *resources);
+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 767f009..9bc4784 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -502,31 +502,6 @@ static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
return b;
}

-static void pci_release_host_bridge_dev(struct device *dev)
-{
- struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
-
- if (bridge->release_fn)
- bridge->release_fn(bridge);
-
- pci_free_resource_list(&bridge->windows);
-
- kfree(bridge);
-}
-
-static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
-{
- struct pci_host_bridge *bridge;
-
- bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
- if (!bridge)
- return NULL;
-
- INIT_LIST_HEAD(&bridge->windows);
- bridge->bus = b;
- return bridge;
-}
-
static const unsigned char pcix_bus_speed[] = {
PCI_SPEED_UNKNOWN, /* 0 */
PCI_SPEED_66MHz_PCIX, /* 1 */
@@ -1889,19 +1864,20 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
{
}

-struct pci_bus *pci_create_root_bus(struct device *parent, int domain,
- int bus, struct pci_ops *ops, void *sysdata,
- struct list_head *resources)
+static struct pci_bus *__pci_create_root_bus(int bus,
+ struct pci_host_bridge *bridge, struct pci_ops *ops,
+ void *sysdata)
{
int error;
- struct pci_host_bridge *bridge;
struct pci_bus *b, *b2;
- struct resource_entry *window, *n;
+ struct resource_entry *window;
+ struct device *parent;
struct resource *res;
resource_size_t offset;
char bus_addr[64];
char *fmt;

+ parent = bridge->dev.parent;
b = pci_alloc_bus(NULL);
if (!b)
return NULL;
@@ -1917,26 +1893,12 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int domain,
goto err_out;
}

- bridge = pci_alloc_host_bridge(b);
- if (!bridge)
- goto err_out;
-
- bridge->domain = domain;
- bridge->dev.parent = parent;
- bridge->dev.release = pci_release_host_bridge_dev;
- dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
+ bridge->bus = b;
+ b->bridge = get_device(&bridge->dev);
error = pcibios_root_bridge_prepare(bridge);
- if (error) {
- kfree(bridge);
- goto err_out;
- }
+ if (error)
+ goto put_dev;

- error = device_register(&bridge->dev);
- if (error) {
- put_device(&bridge->dev);
- goto err_out;
- }
- b->bridge = get_device(&bridge->dev);
device_enable_async_suspend(b->bridge);
pci_set_bus_of_node(b);

@@ -1945,10 +1907,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int domain,

b->dev.class = &pcibus_class;
b->dev.parent = b->bridge;
- dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
+ dev_set_name(&b->dev, "%04x:%02x", bridge->domain, bus);
error = device_register(&b->dev);
if (error)
- goto class_dev_reg_err;
+ goto put_dev;

pcibios_add_bus(b);

@@ -1961,8 +1923,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int domain,
printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));

/* Add initial resources to the bus */
- resource_list_for_each_entry_safe(window, n, resources) {
- list_move_tail(&window->node, &bridge->windows);
+ resource_list_for_each_entry(window, &bridge->windows) {
res = window->res;
offset = window->offset;
if (res->flags & IORESOURCE_BUS)
@@ -1988,14 +1949,30 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int domain,

return b;

-class_dev_reg_err:
+put_dev:
put_device(&bridge->dev);
- device_unregister(&bridge->dev);
err_out:
kfree(b);
return NULL;
}

+struct pci_bus *pci_create_root_bus(struct device *parent,
+ int domain, int bus, struct pci_ops *ops, void *sysdata,
+ struct list_head *resources)
+{
+ struct pci_host_bridge *host;
+
+ host = pci_create_host_bridge(parent, domain, bus, resources);
+ if (!host)
+ return NULL;
+
+ host->bus = __pci_create_root_bus(bus, host, ops, sysdata);
+ if (!host->bus)
+ pci_free_host_bridge(host);
+
+ return host->bus;
+}
+
int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
{
struct resource *res = &b->busn_res;
@@ -2059,23 +2036,22 @@ void pci_bus_release_busn_res(struct pci_bus *b)
res, ret ? "can not be" : "is");
}

-struct pci_bus *pci_scan_root_bus(struct device *parent, int domain,
- int bus, struct pci_ops *ops, void *sysdata,
- struct list_head *resources)
+static struct pci_bus *__pci_scan_root_bus(int bus,
+ struct pci_host_bridge *host, struct pci_ops *ops,
+ void *sysdata)
{
struct resource_entry *window;
bool found = false;
struct pci_bus *b;
int max;

- resource_list_for_each_entry(window, resources)
+ resource_list_for_each_entry(window, &host->windows)
if (window->res->flags & IORESOURCE_BUS) {
found = true;
break;
}

- b = pci_create_root_bus(parent, domain, bus, ops,
- sysdata, resources);
+ b = __pci_create_root_bus(bus, host, ops, sysdata);
if (!b)
return NULL;

@@ -2093,6 +2069,23 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int domain,

return 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 *host;
+
+ host = pci_create_host_bridge(parent, domain, bus, resources);
+ if (!host)
+ return NULL;
+
+ host->bus = __pci_scan_root_bus(bus, host, ops, sysdata);
+ if (!host->bus)
+ pci_free_host_bridge(host);
+
+ return host->bus;
+}
EXPORT_SYMBOL(pci_scan_root_bus);

struct pci_bus *pci_scan_bus(int domain, int bus,
--
1.7.1