mirror of https://gitee.com/openkylin/linux.git
147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
// 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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