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100 lines
2.4 KiB
100 lines
2.4 KiB
// 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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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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