arch/x86/pci/bus_numa.c

   1 #include <linux/init.h>
   2 #include <linux/pci.h>
   3
   4 #include "bus_numa.h"
   5
   6 int pci_root_num;
   7 struct pci_root_info pci_root_info[PCI_ROOT_NR];
   8 int found_all_numa_early;
   9
  10 void x86_pci_root_bus_res_quirks(struct pci_bus *b)
  11 {
  12         int i;
  13         int j;
  14         struct pci_root_info *info;
  15
  16         /* don't go for it if _CRS is used already */
  17         if (b->resource[0] != &ioport_resource ||
  18             b->resource[1] != &iomem_resource)
  19                 return;
  20
  21         if (!pci_root_num)
  22                 return;
  23
  24         /* for amd, if only one root bus, don't need to do anything */
  25         if (pci_root_num < 2 && found_all_numa_early)
  26                 return;
  27
  28         for (i = 0; i < pci_root_num; i++) {
  29                 if (pci_root_info[i].bus_min == b->number)
  30                         break;
  31         }
  32
  33         if (i == pci_root_num)
  34                 return;
  35
  36         printk(KERN_DEBUG "PCI: peer root bus %02x res updated from pci conf\n",
  37                         b->number);
  38
  39         pci_bus_remove_resources(b);
  40         info = &pci_root_info[i];
  41         for (j = 0; j < info->res_num; j++) {
  42                 struct resource *res;
  43                 struct resource *root;
  44
  45                 res = &info->res[j];
  46                 pci_bus_add_resource(b, res, 0);
  47                 if (res->flags & IORESOURCE_IO)
  48                         root = &ioport_resource;
  49                 else
  50                         root = &iomem_resource;
  51                 insert_resource(root, res);
  52         }
  53 }
  54
  55 void __devinit update_res(struct pci_root_info *info, size_t start,
  56                               size_t end, unsigned long flags, int merge)
  57 {
  58         int i;
  59         struct resource *res;
  60
  61         if (start > end)
  62                 return;
  63
  64         if (!merge)
  65                 goto addit;
  66
  67         /* try to merge it with old one */
  68         for (i = 0; i < info->res_num; i++) {
  69                 size_t final_start, final_end;
  70                 size_t common_start, common_end;
  71
  72                 res = &info->res[i];
  73                 if (res->flags != flags)
  74                         continue;
  75
  76                 common_start = max((size_t)res->start, start);
  77                 common_end = min((size_t)res->end, end);
  78                 if (common_start > common_end + 1)
  79                         continue;
  80
  81                 final_start = min((size_t)res->start, start);
  82                 final_end = max((size_t)res->end, end);
  83
  84                 res->start = final_start;
  85                 res->end = final_end;
  86                 return;
  87         }
  88
  89 addit:
  90
  91         /* need to add that */
  92         if (info->res_num >= RES_NUM)
  93                 return;
  94
  95         res = &info->res[info->res_num];
  96         res->name = info->name;
  97         res->flags = flags;
  98         res->start = start;
  99         res->end = end;
 100         res->child = NULL;
 101         info->res_num++;
 102 }