PCI: add struct pci_host_bridge_window with CPU/bus address offset
Some PCI host bridges apply an address offset, so bus addresses on PCI are different from CPU addresses. This patch adds a way for architectures to tell the PCI core about this offset. For example: LIST_HEAD(resources); pci_add_resource_offset(&resources, host->io_space, host->io_offset); pci_add_resource_offset(&resources, host->mem_space, host->mem_offset); pci_scan_root_bus(parent, bus, ops, sysdata, &resources); Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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@@ -368,9 +368,16 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
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return (pdev->error_state != pci_channel_io_normal);
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}
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struct pci_host_bridge_window {
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struct list_head list;
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struct resource *res; /* host bridge aperture (CPU address) */
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resource_size_t offset; /* bus address + offset = CPU address */
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};
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struct pci_host_bridge {
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struct list_head list;
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struct pci_bus *bus; /* root bus */
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struct list_head windows; /* pci_host_bridge_windows */
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};
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/*
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@@ -901,6 +908,8 @@ void pci_release_selected_regions(struct pci_dev *, int);
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/* drivers/pci/bus.c */
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void pci_add_resource(struct list_head *resources, struct resource *res);
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void pci_add_resource_offset(struct list_head *resources, struct resource *res,
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resource_size_t offset);
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void pci_free_resource_list(struct list_head *resources);
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void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags);
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struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
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