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PCI: add struct pci_host_bridge_window with CPU/bus address offset

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Some PCI host bridges apply an address offset, so bus addresses on PCI are
different from CPU addresses.  This patch adds a way for architectures to
tell the PCI core about this offset.  For example:

    LIST_HEAD(resources);
    pci_add_resource_offset(&resources, host->io_space, host->io_offset);
    pci_add_resource_offset(&resources, host->mem_space, host->mem_offset);
    pci_scan_root_bus(parent, bus, ops, sysdata, &resources);

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2012-02-23 20:19:00 -07:00
parent 5a21d70dbd
commit 0efd5aab41
3 changed files with 51 additions and 20 deletions
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30
drivers/pci/bus.c
View File

@ -18,28 +18,36 @@
#include "pci.h"
void pci_add_resource(struct list_head *resources, struct resource *res)
void pci_add_resource_offset(struct list_head *resources, struct resource *res,
resource_size_t offset)
{
struct pci_bus_resource *bus_res;
struct pci_host_bridge_window *window;
bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
if (!bus_res) {
printk(KERN_ERR "PCI: can't add bus resource %pR\n", res);
window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
if (!window) {
printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
return;
}
bus_res->res = res;
list_add_tail(&bus_res->list, resources);
window->res = res;
window->offset = offset;
list_add_tail(&window->list, resources);
}
EXPORT_SYMBOL(pci_add_resource_offset);
void pci_add_resource(struct list_head *resources, struct resource *res)
{
pci_add_resource_offset(resources, res, 0);
}
EXPORT_SYMBOL(pci_add_resource);
void pci_free_resource_list(struct list_head *resources)
{
struct pci_bus_resource *bus_res, *tmp;
struct pci_host_bridge_window *window, *tmp;
list_for_each_entry_safe(bus_res, tmp, resources, list) {
list_del(&bus_res->list);
kfree(bus_res);
list_for_each_entry_safe(window, tmp, resources, list) {
list_del(&window->list);
kfree(window);
}
}
EXPORT_SYMBOL(pci_free_resource_list);

32
drivers/pci/probe.c
View File

@ -1562,12 +1562,15 @@ unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
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;
int error;
struct pci_host_bridge *bridge;
struct pci_bus *b, *b2;
struct device *dev;
struct pci_bus_resource *bus_res, *n;
struct pci_host_bridge_window *window, *n;
struct resource *res;
resource_size_t offset;
char bus_addr[64];
char *fmt;
bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
@ -1617,19 +1620,30 @@ 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);
INIT_LIST_HEAD(&bridge->windows);
if (parent)
dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
else
printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
pci_bus_for_each_resource(b, res, i) {
if (res)
dev_info(&b->dev, "root bus resource %pR\n", res);
/* Add initial resources to the bus */
list_for_each_entry_safe(window, n, resources, list) {
list_move_tail(&window->list, &bridge->windows);
res = window->res;
offset = window->offset;
pci_bus_add_resource(b, res, 0);
if (offset) {
if (resource_type(res) == IORESOURCE_IO)
fmt = " (bus address [%#06llx-%#06llx])";
else
fmt = " (bus address [%#010llx-%#010llx])";
snprintf(bus_addr, sizeof(bus_addr), fmt,
(unsigned long long) (res->start - offset),
(unsigned long long) (res->end - offset));
} else
bus_addr[0] = '\0';
dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
}
down_write(&pci_bus_sem);

9
include/linux/pci.h
View File

@ -368,9 +368,16 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
return (pdev->error_state != pci_channel_io_normal);
}
struct pci_host_bridge_window {
struct list_head list;
struct resource *res; /* host bridge aperture (CPU address) */
resource_size_t offset; /* bus address + offset = CPU address */
};
struct pci_host_bridge {
struct list_head list;
struct pci_bus *bus; /* root bus */
struct list_head windows; /* pci_host_bridge_windows */
};
/*
@ -901,6 +908,8 @@ void pci_release_selected_regions(struct pci_dev *, int);
/* drivers/pci/bus.c */
void pci_add_resource(struct list_head *resources, struct resource *res);
void pci_add_resource_offset(struct list_head *resources, struct resource *res,
resource_size_t offset);
void pci_free_resource_list(struct list_head *resources);
void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags);
struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);