PCI: add struct pci_host_bridge_window with CPU/bus address offset
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>
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 398f5d8..4ce5ef2 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -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);