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1// SPDX-License-Identifier: GPL-2.02/*3 * Host bridge related code4 */5 6#include <linux/kernel.h>7#include <linux/pci.h>8#include <linux/module.h>9 10#include "pci.h"11 12static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)13{14 while (bus->parent)15 bus = bus->parent;16 17 return bus;18}19 20struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)21{22 struct pci_bus *root_bus = find_pci_root_bus(bus);23 24 return to_pci_host_bridge(root_bus->bridge);25}26EXPORT_SYMBOL_GPL(pci_find_host_bridge);27 28struct device *pci_get_host_bridge_device(struct pci_dev *dev)29{30 struct pci_bus *root_bus = find_pci_root_bus(dev->bus);31 struct device *bridge = root_bus->bridge;32 33 kobject_get(&bridge->kobj);34 return bridge;35}36 37void pci_put_host_bridge_device(struct device *dev)38{39 kobject_put(&dev->kobj);40}41 42void pci_set_host_bridge_release(struct pci_host_bridge *bridge,43 void (*release_fn)(struct pci_host_bridge *),44 void *release_data)45{46 bridge->release_fn = release_fn;47 bridge->release_data = release_data;48}49EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);50 51void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,52 struct resource *res)53{54 struct pci_host_bridge *bridge = pci_find_host_bridge(bus);55 struct resource_entry *window;56 resource_size_t offset = 0;57 58 resource_list_for_each_entry(window, &bridge->windows) {59 if (resource_contains(window->res, res)) {60 offset = window->offset;61 break;62 }63 }64 65 region->start = res->start - offset;66 region->end = res->end - offset;67}68EXPORT_SYMBOL(pcibios_resource_to_bus);69 70static bool region_contains(struct pci_bus_region *region1,71 struct pci_bus_region *region2)72{73 return region1->start <= region2->start && region1->end >= region2->end;74}75 76void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,77 struct pci_bus_region *region)78{79 struct pci_host_bridge *bridge = pci_find_host_bridge(bus);80 struct resource_entry *window;81 resource_size_t offset = 0;82 83 resource_list_for_each_entry(window, &bridge->windows) {84 struct pci_bus_region bus_region;85 86 if (resource_type(res) != resource_type(window->res))87 continue;88 89 bus_region.start = window->res->start - window->offset;90 bus_region.end = window->res->end - window->offset;91 92 if (region_contains(&bus_region, region)) {93 offset = window->offset;94 break;95 }96 }97 98 res->start = region->start + offset;99 res->end = region->end + offset;100}101EXPORT_SYMBOL(pcibios_bus_to_resource);102