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146 lines
3.1 KiB
146 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/init.h> |
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#include <linux/pci.h> |
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#include <linux/range.h> |
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#include "bus_numa.h" |
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LIST_HEAD(pci_root_infos); |
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static struct pci_root_info *x86_find_pci_root_info(int bus) |
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{ |
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struct pci_root_info *info; |
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list_for_each_entry(info, &pci_root_infos, list) |
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if (info->busn.start == bus) |
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return info; |
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return NULL; |
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} |
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int x86_pci_root_bus_node(int bus) |
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{ |
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struct pci_root_info *info = x86_find_pci_root_info(bus); |
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if (!info) |
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return NUMA_NO_NODE; |
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return info->node; |
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} |
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void x86_pci_root_bus_resources(int bus, struct list_head *resources) |
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{ |
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struct pci_root_info *info = x86_find_pci_root_info(bus); |
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struct pci_root_res *root_res; |
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struct resource_entry *window; |
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bool found = false; |
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if (!info) |
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goto default_resources; |
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printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n", |
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bus); |
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/* already added by acpi ? */ |
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resource_list_for_each_entry(window, resources) |
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if (window->res->flags & IORESOURCE_BUS) { |
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found = true; |
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break; |
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} |
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if (!found) |
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pci_add_resource(resources, &info->busn); |
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list_for_each_entry(root_res, &info->resources, list) |
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pci_add_resource(resources, &root_res->res); |
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return; |
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default_resources: |
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/* |
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* We don't have any host bridge aperture information from the |
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* "native host bridge drivers," e.g., amd_bus or broadcom_bus, |
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* so fall back to the defaults historically used by pci_create_bus(). |
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*/ |
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printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus); |
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pci_add_resource(resources, &ioport_resource); |
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pci_add_resource(resources, &iomem_resource); |
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} |
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struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max, |
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int node, int link) |
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{ |
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struct pci_root_info *info; |
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info = kzalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return info; |
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sprintf(info->name, "PCI Bus #%02x", bus_min); |
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INIT_LIST_HEAD(&info->resources); |
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info->busn.name = info->name; |
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info->busn.start = bus_min; |
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info->busn.end = bus_max; |
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info->busn.flags = IORESOURCE_BUS; |
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info->node = node; |
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info->link = link; |
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list_add_tail(&info->list, &pci_root_infos); |
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return info; |
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} |
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void update_res(struct pci_root_info *info, resource_size_t start, |
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resource_size_t end, unsigned long flags, int merge) |
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{ |
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struct resource *res; |
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struct pci_root_res *root_res; |
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if (start > end) |
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return; |
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if (start == MAX_RESOURCE) |
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return; |
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if (!merge) |
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goto addit; |
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/* try to merge it with old one */ |
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list_for_each_entry(root_res, &info->resources, list) { |
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resource_size_t final_start, final_end; |
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resource_size_t common_start, common_end; |
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res = &root_res->res; |
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if (res->flags != flags) |
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continue; |
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common_start = max(res->start, start); |
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common_end = min(res->end, end); |
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if (common_start > common_end + 1) |
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continue; |
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final_start = min(res->start, start); |
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final_end = max(res->end, end); |
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res->start = final_start; |
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res->end = final_end; |
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return; |
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} |
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addit: |
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/* need to add that */ |
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root_res = kzalloc(sizeof(*root_res), GFP_KERNEL); |
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if (!root_res) |
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return; |
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res = &root_res->res; |
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res->name = info->name; |
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res->flags = flags; |
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res->start = start; |
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res->end = end; |
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list_add_tail(&root_res->list, &info->resources); |
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}
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