102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Host bridge related code
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include "pci.h"
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static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
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{
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while (bus->parent)
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bus = bus->parent;
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return bus;
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}
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struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
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{
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struct pci_bus *root_bus = find_pci_root_bus(bus);
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return to_pci_host_bridge(root_bus->bridge);
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}
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EXPORT_SYMBOL_GPL(pci_find_host_bridge);
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struct device *pci_get_host_bridge_device(struct pci_dev *dev)
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{
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struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
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struct device *bridge = root_bus->bridge;
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kobject_get(&bridge->kobj);
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return bridge;
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}
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void pci_put_host_bridge_device(struct device *dev)
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{
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kobject_put(&dev->kobj);
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}
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void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
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void (*release_fn)(struct pci_host_bridge *),
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void *release_data)
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{
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bridge->release_fn = release_fn;
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bridge->release_data = release_data;
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}
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EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
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void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
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struct resource *res)
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{
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struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
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struct resource_entry *window;
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resource_size_t offset = 0;
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resource_list_for_each_entry(window, &bridge->windows) {
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if (resource_contains(window->res, res)) {
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offset = window->offset;
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break;
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}
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}
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region->start = res->start - offset;
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region->end = res->end - offset;
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}
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EXPORT_SYMBOL(pcibios_resource_to_bus);
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static bool region_contains(struct pci_bus_region *region1,
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struct pci_bus_region *region2)
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{
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return region1->start <= region2->start && region1->end >= region2->end;
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}
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void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
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struct pci_bus_region *region)
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{
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struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
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struct resource_entry *window;
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resource_size_t offset = 0;
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resource_list_for_each_entry(window, &bridge->windows) {
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struct pci_bus_region bus_region;
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if (resource_type(res) != resource_type(window->res))
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continue;
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bus_region.start = window->res->start - window->offset;
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bus_region.end = window->res->end - window->offset;
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if (region_contains(&bus_region, region)) {
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offset = window->offset;
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break;
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}
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}
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res->start = region->start + offset;
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res->end = region->end + offset;
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}
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EXPORT_SYMBOL(pcibios_bus_to_resource);
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