forked from Minki/linux
5edb93b89f
We have two identical copies of resource_contains() already, and more places that could use it. This moves it to ioport.h where it can be shared. resource_contains(struct resource *r1, struct resource *r2) returns true iff r1 and r2 are the same type (most callers already checked this separately) and the r1 address range completely contains r2. In addition, the new resource_contains() checks that both r1 and r2 have addresses assigned to them. If a resource is IORESOURCE_UNSET, it doesn't have a valid address and can't contain or be contained by another resource. Some callers already check this or for res->start. No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
|
|
* host bridge related code
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "pci.h"
|
|
|
|
static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
|
|
{
|
|
while (bus->parent)
|
|
bus = bus->parent;
|
|
|
|
return bus;
|
|
}
|
|
|
|
static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
|
|
{
|
|
struct pci_bus *root_bus = find_pci_root_bus(bus);
|
|
|
|
return to_pci_host_bridge(root_bus->bridge);
|
|
}
|
|
|
|
void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
|
|
void (*release_fn)(struct pci_host_bridge *),
|
|
void *release_data)
|
|
{
|
|
bridge->release_fn = release_fn;
|
|
bridge->release_data = release_data;
|
|
}
|
|
|
|
void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
|
|
struct resource *res)
|
|
{
|
|
struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
|
|
struct pci_host_bridge_window *window;
|
|
resource_size_t offset = 0;
|
|
|
|
list_for_each_entry(window, &bridge->windows, list) {
|
|
if (resource_contains(window->res, res)) {
|
|
offset = window->offset;
|
|
break;
|
|
}
|
|
}
|
|
|
|
region->start = res->start - offset;
|
|
region->end = res->end - offset;
|
|
}
|
|
EXPORT_SYMBOL(pcibios_resource_to_bus);
|
|
|
|
static bool region_contains(struct pci_bus_region *region1,
|
|
struct pci_bus_region *region2)
|
|
{
|
|
return region1->start <= region2->start && region1->end >= region2->end;
|
|
}
|
|
|
|
void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
|
|
struct pci_bus_region *region)
|
|
{
|
|
struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
|
|
struct pci_host_bridge_window *window;
|
|
resource_size_t offset = 0;
|
|
|
|
list_for_each_entry(window, &bridge->windows, list) {
|
|
struct pci_bus_region bus_region;
|
|
|
|
if (resource_type(res) != resource_type(window->res))
|
|
continue;
|
|
|
|
bus_region.start = window->res->start - window->offset;
|
|
bus_region.end = window->res->end - window->offset;
|
|
|
|
if (region_contains(&bus_region, region)) {
|
|
offset = window->offset;
|
|
break;
|
|
}
|
|
}
|
|
|
|
res->start = region->start + offset;
|
|
res->end = region->end + offset;
|
|
}
|
|
EXPORT_SYMBOL(pcibios_bus_to_resource);
|