[PATCH 06/28] PCI: Combine PCI domain and bus number in u32 arg

Yijing Wang
2015-01-16T01:44:04Z

Currently, we use int type for bus number in
pci_create_root_bus(), pci_scan_root_bus() and
pci_scan_bus_legacy. Because PCI bus number
always <= 255, so we could change the bus number
argument type to u32, and combine PCI domain and
bus number in one. Also add a domain member in
pci_host_bridge to save domain number. Finally,
we could eliminate lots of the platform specific
pci_domain_nr() in the last of the series.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
---
drivers/pci/probe.c | 16 +++++++++-------
include/linux/pci.h | 7 ++++---
include/uapi/linux/pci.h | 3 +++
3 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ed894cb..50f58b3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1889,7 +1889,7 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
{
}

-struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
+struct pci_bus *pci_create_root_bus(struct device *parent, u32 db,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
{
int error;
@@ -1900,6 +1900,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
resource_size_t offset;
char bus_addr[64];
char *fmt;
+ u8 bus = PCI_BUSNUM(db);

b = pci_alloc_bus(NULL);
if (!b)
@@ -1920,6 +1921,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
if (!bridge)
goto err_out;

+ bridge->domain = PCI_DOMAIN(db);
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);
@@ -2057,7 +2059,7 @@ 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 bus,
+struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
{
struct pci_host_bridge_window *window;
@@ -2071,15 +2073,15 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
break;
}

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

if (!found) {
dev_info(&b->dev,
"No busn resource found for root bus, will use [bus %02x-ff]\n",
- bus);
- pci_bus_insert_busn_res(b, bus, 255);
+ PCI_BUSNUM(db));
+ pci_bus_insert_busn_res(b, PCI_BUSNUM(db), 255);
}

max = pci_scan_child_bus(b);
@@ -2091,7 +2093,7 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
}
EXPORT_SYMBOL(pci_scan_root_bus);

-struct pci_bus *pci_scan_bus_legacy(int bus, struct pci_ops *ops,
+struct pci_bus *pci_scan_bus_legacy(u32 db, struct pci_ops *ops,
void *sysdata)
{
LIST_HEAD(resources);
@@ -2100,7 +2102,7 @@ struct pci_bus *pci_scan_bus_legacy(int bus, struct pci_ops *ops,
pci_add_resource(&resources, &ioport_resource);
pci_add_resource(&resources, &iomem_resource);
pci_add_resource(&resources, &busn_resource);
- b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
+ b = pci_create_root_bus(NULL, db, ops, sysdata, &resources);
if (b) {
pci_scan_child_bus(b);
} else {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a6fa2f1..c771508 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -402,6 +402,7 @@ struct pci_host_bridge_window {
};

struct pci_host_bridge {
+ u16 domain;
struct device dev;
struct pci_bus *bus; /* root bus */
struct list_head windows; /* pci_host_bridge_windows */
@@ -769,14 +770,14 @@ void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
void pcibios_scan_specific_bus(int busn);
struct pci_bus *pci_find_bus(int domain, int busnr);
void pci_bus_add_devices(const struct pci_bus *bus);
-struct pci_bus *pci_scan_bus_legacy(int bus, struct pci_ops *ops, void *sysdata);
-struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
+struct pci_bus *pci_scan_bus_legacy(u32 dombus, struct pci_ops *ops, void *sysdata);
+struct pci_bus *pci_create_root_bus(struct device *parent, u32 dombus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
void pci_bus_release_busn_res(struct pci_bus *b);
-struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
+struct pci_bus *pci_scan_root_bus(struct device *parent, u32 dombus,
struct pci_ops *ops, void *sysdata,
struct list_head *resources);
struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
diff --git a/include/uapi/linux/pci.h b/include/uapi/linux/pci.h
index 3c292bc..89c6f15 100644
--- a/include/uapi/linux/pci.h
+++ b/include/uapi/linux/pci.h
@@ -30,6 +30,9 @@
#define PCI_DEVFN(slot, func) ((((slot) & 0x1f) << 3) | ((func) & 0x07))
#define PCI_SLOT(devfn) (((devfn) >> 3) & 0x1f)
#define PCI_FUNC(devfn) ((devfn) & 0x07)
+#define PCI_DOMAIN(db) ((db) >> 16)
+#define PCI_BUSNUM(db) ((db) & 0xffff)
+#define PCI_DOMBUS(domain, bus) (((domain) << 16) | (bus))

/* Ioctls for /proc/bus/pci/X/Y nodes. */
#define PCIIOC_BASE ('P' << 24 | 'C' << 16 | 'I' << 8)
--
1.7.1