arch/x86/pci/bus_numa.c

   1 #include <linux/init.h>
   2 #include <linux/pci.h>
   3 #include <linux/range.h>
   4
   5 #include "bus_numa.h"
   6
   7 int pci_root_num;
   8 struct pci_root_info pci_root_info[PCI_ROOT_NR];
   9
  10 void 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
  45 default_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
  56 void __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
  93 addit:
  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 }