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PCI: add struct pci_host_bridge and a list of all bridges found 

This adds a list of all PCI host bridges we find and a way to look up
the host bridge from a pci_dev.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
hifive-unleashed-5.1
Bjorn Helgaas 2012-02-23 20:18:59 -07:00
parent a5390aa6dc
commit 5a21d70dbd
2 changed files with 40 additions and 6 deletions
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41
drivers/pci/probe.c
View File

@ -15,6 +15,8 @@
#define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
#define CARDBUS_RESERVE_BUSNR 3
static LIST_HEAD(pci_host_bridges);
/* Ugh. Need to stop exporting this to modules. */
LIST_HEAD(pci_root_buses);
EXPORT_SYMBOL(pci_root_buses);
@ -42,6 +44,23 @@ int no_pci_devices(void)
}
EXPORT_SYMBOL(no_pci_devices);
static struct pci_host_bridge *pci_host_bridge(struct pci_dev *dev)
{
struct pci_bus *bus;
struct pci_host_bridge *bridge;
bus = dev->bus;
while (bus->parent)
bus = bus->parent;
list_for_each_entry(bridge, &pci_host_bridges, list) {
if (bridge->bus == bus)
return bridge;
}
return NULL;
}
/*
* PCI Bus Class
*/
@ -1544,20 +1563,23 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
struct pci_ops *ops, void *sysdata, struct list_head *resources)
{
int error, i;
struct pci_host_bridge *bridge;
struct pci_bus *b, *b2;
struct device *dev;
struct pci_bus_resource *bus_res, *n;
struct resource *res;
b = pci_alloc_bus();
if (!b)
bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return NULL;
b = pci_alloc_bus();
if (!b)
goto err_bus;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
kfree(b);
return NULL;
}
if (!dev)
goto err_dev;
b->sysdata = sysdata;
b->ops = ops;
@ -1594,6 +1616,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
b->number = b->secondary = bus;
bridge->bus = b;
/* Add initial resources to the bus */
list_for_each_entry_safe(bus_res, n, resources, list)
list_move_tail(&bus_res->list, &b->resources);
@ -1609,6 +1633,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
}
down_write(&pci_bus_sem);
list_add_tail(&bridge->list, &pci_host_bridges);
list_add_tail(&b->node, &pci_root_buses);
up_write(&pci_bus_sem);
@ -1618,11 +1643,15 @@ class_dev_reg_err:
device_unregister(dev);
dev_reg_err:
down_write(&pci_bus_sem);
list_del(&bridge->list);
list_del(&b->node);
up_write(&pci_bus_sem);
err_out:
kfree(dev);
err_dev:
kfree(b);
err_bus:
kfree(bridge);
return NULL;
}

5
include/linux/pci.h
View File

@ -368,6 +368,11 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
return (pdev->error_state != pci_channel_io_normal);
}
struct pci_host_bridge {
struct list_head list;
struct pci_bus *bus; /* root bus */
};
/*
* The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond
* to P2P or CardBus bridge windows) go in a table. Additional ones (for