Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pci / host-bridge.c

diff --git a/kernel/drivers/pci/host-bridge.c b/kernel/drivers/pci/host-bridge.c
new file mode 100644 (file)
index 0000000..5f4a2e0
--- /dev/null
+++ b/kernel/drivers/pci/host-bridge.c
@@ -0,0 +1,98 @@
+/*
+ * host bridge related code
+ */
+
+#include <linux/kernel.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;
+}
+
+struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
+{
+       struct pci_bus *root_bus = find_pci_root_bus(bus);
+
+       return to_pci_host_bridge(root_bus->bridge);
+}
+
+struct device *pci_get_host_bridge_device(struct pci_dev *dev)
+{
+       struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
+       struct device *bridge = root_bus->bridge;
+
+       kobject_get(&bridge->kobj);
+       return bridge;
+}
+
+void  pci_put_host_bridge_device(struct device *dev)
+{
+       kobject_put(&dev->kobj);
+}
+
+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 = pci_find_host_bridge(bus);
+       struct resource_entry *window;
+       resource_size_t offset = 0;
+
+       resource_list_for_each_entry(window, &bridge->windows) {
+               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 = pci_find_host_bridge(bus);
+       struct resource_entry *window;
+       resource_size_t offset = 0;
+
+       resource_list_for_each_entry(window, &bridge->windows) {
+               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);