LXR linux/arch/x86/pci/bus

   1#include <linux/init.h>
   2#include <linux/pci.h>
   3#include <linux/range.h>
   4
   5#include "bus_numa.h"
   6
   7int pci_root_num;
   8struct pci_root_info pci_root_info[PCI_ROOT_NR];
   9
  10void x86_pci_root_bus_resources(int bus, struct list_head *resources)
  11{
  12        int i;
  13        int j;
  14        struct pci_root_info *info;
  15
  16        if (!pci_root_num)
  17                goto default_resources;
  18
  19        for (i = 0; i < pci_root_num; i++) {
  20                if (pci_root_info[i].bus_min == bus)
  21                        break;
  22        }
  23
  24        if (i == pci_root_num)
  25                goto default_resources;
  26
  27        printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
  28               bus);
  29
  30        info = &pci_root_info[i];
  31        for (j = 0; j < info->res_num; j++) {
  32                struct resource *res;
  33                struct resource *root;
  34
  35                res = &info->res[j];
  36                pci_add_resource(resources, res);
  37                if (res->flags & IORESOURCE_IO)
  38                        root = &ioport_resource;
  39                else
  40                        root = &iomem_resource;
  41                insert_resource(root, res);
  42        }
  43        return;
  44
  45default_resources:
  46        /*
  47         * We don't have any host bridge aperture information from the
  48         * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
  49         * so fall back to the defaults historically used by pci_create_bus().
  50         */
  51        printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
  52        pci_add_resource(resources, &ioport_resource);
  53        pci_add_resource(resources, &iomem_resource);
  54}
  55
  56void __devinit update_res(struct pci_root_info *info, resource_size_t start,
  57                          resource_size_t end, unsigned long flags, int merge)
  58{
  59        int i;
  60        struct resource *res;
  61
  62        if (start > end)
  63                return;
  64
  65        if (start == MAX_RESOURCE)
  66                return;
  67
  68        if (!merge)
  69                goto addit;
  70
  71        /* try to merge it with old one */
  72        for (i = 0; i < info->res_num; i++) {
  73                resource_size_t final_start, final_end;
  74                resource_size_t common_start, common_end;
  75
  76                res = &info->res[i];
  77                if (res->flags != flags)
  78                        continue;
  79
  80                common_start = max(res->start, start);
  81                common_end = min(res->end, end);
  82                if (common_start > common_end + 1)
  83                        continue;
  84
  85                final_start = min(res->start, start);
  86                final_end = max(res->end, end);
  87
  88                res->start = final_start;
  89                res->end = final_end;
  90                return;
  91        }
  92
  93addit:
  94
  95        /* need to add that */
  96        if (info->res_num >= RES_NUM)
  97                return;
  98
  99        res = &info->res[info->res_num];
 100        res->name = info->name;
 101        res->flags = flags;
 102        res->start = start;
 103        res->end = end;
 104        res->child = NULL;
 105        info->res_num++;
 106}
 107