arch/x86/mm/k8topology_64.c

   1 /*
   2  * AMD K8 NUMA support.
   3  * Discover the memory map and associated nodes.
   4  *
   5  * This version reads it directly from the K8 northbridge.
   6  *
   7  * Copyright 2002,2003 Andi Kleen, SuSE Labs.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/string.h>
  12 #include <linux/module.h>
  13 #include <linux/nodemask.h>
  14 #include <asm/io.h>
  15 #include <linux/pci_ids.h>
  16 #include <linux/acpi.h>
  17 #include <asm/types.h>
  18 #include <asm/mmzone.h>
  19 #include <asm/proto.h>
  20 #include <asm/e820.h>
  21 #include <asm/pci-direct.h>
  22 #include <asm/numa.h>
  23 #include <asm/mpspec.h>
  24 #include <asm/apic.h>
  25
  26 static __init int find_northbridge(void)
  27 {
  28         int num;
  29
  30         for (num = 0; num < 32; num++) {
  31                 u32 header;
  32
  33                 header = read_pci_config(0, num, 0, 0x00);
  34                 if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
  35                         header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
  36                         header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
  37                         continue;
  38
  39                 header = read_pci_config(0, num, 1, 0x00);
  40                 if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
  41                         header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
  42                         header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
  43                         continue;
  44                 return num;
  45         }
  46
  47         return -1;
  48 }
  49
  50 static __init void early_get_boot_cpu_id(void)
  51 {
  52         /*
  53          * need to get boot_cpu_id so can use that to create apicid_to_node
  54          * in k8_scan_nodes()
  55          */
  56         /*
  57          * Find possible boot-time SMP configuration:
  58          */
  59         early_find_smp_config();
  60 #ifdef CONFIG_ACPI
  61         /*
  62          * Read APIC information from ACPI tables.
  63          */
  64         early_acpi_boot_init();
  65 #endif
  66         /*
  67          * get boot-time SMP configuration:
  68          */
  69         if (smp_found_config)
  70                 early_get_smp_config();
  71         early_init_lapic_mapping();
  72 }
  73
  74 int __init k8_scan_nodes(unsigned long start, unsigned long end)
  75 {
  76         unsigned long prevbase;
  77         struct bootnode nodes[8];
  78         int nodeid, i, nb;
  79         unsigned char nodeids[8];
  80         int found = 0;
  81         u32 reg;
  82         unsigned numnodes;
  83         unsigned cores;
  84         unsigned bits;
  85         int j;
  86         unsigned apicid_base;
  87
  88         if (!early_pci_allowed())
  89                 return -1;
  90
  91         nb = find_northbridge();
  92         if (nb < 0)
  93                 return nb;
  94
  95         printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
  96
  97         reg = read_pci_config(0, nb, 0, 0x60);
  98         numnodes = ((reg >> 4) & 0xF) + 1;
  99         if (numnodes <= 1)
 100                 return -1;
 101
 102         printk(KERN_INFO "Number of nodes %d\n", numnodes);
 103
 104         memset(&nodes, 0, sizeof(nodes));
 105         prevbase = 0;
 106         for (i = 0; i < 8; i++) {
 107                 unsigned long base, limit;
 108                 u32 nodeid;
 109
 110                 base = read_pci_config(0, nb, 1, 0x40 + i*8);
 111                 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 112
 113                 nodeid = limit & 7;
 114                 nodeids[i] = nodeid;
 115                 if ((base & 3) == 0) {
 116                         if (i < numnodes)
 117                                 printk("Skipping disabled node %d\n", i);
 118                         continue;
 119                 }
 120                 if (nodeid >= numnodes) {
 121                         printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
 122                                base, limit);
 123                         continue;
 124                 }
 125
 126                 if (!limit) {
 127                         printk(KERN_INFO "Skipping node entry %d (base %lx)\n",
 128                                i, base);
 129                         continue;
 130                 }
 131                 if ((base >> 8) & 3 || (limit >> 8) & 3) {
 132                         printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
 133                                nodeid, (base>>8)&3, (limit>>8) & 3);
 134                         return -1;
 135                 }
 136                 if (node_isset(nodeid, node_possible_map)) {
 137                         printk(KERN_INFO "Node %d already present. Skipping\n",
 138                                nodeid);
 139                         continue;
 140                 }
 141
 142                 limit >>= 16;
 143                 limit <<= 24;
 144                 limit |= (1<<24)-1;
 145                 limit++;
 146
 147                 if (limit > end_pfn << PAGE_SHIFT)
 148                         limit = end_pfn << PAGE_SHIFT;
 149                 if (limit <= base)
 150                         continue;
 151
 152                 base >>= 16;
 153                 base <<= 24;
 154
 155                 if (base < start)
 156                         base = start;
 157                 if (limit > end)
 158                         limit = end;
 159                 if (limit == base) {
 160                         printk(KERN_ERR "Empty node %d\n", nodeid);
 161                         continue;
 162                 }
 163                 if (limit < base) {
 164                         printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
 165                                nodeid, base, limit);
 166                         continue;
 167                 }
 168
 169                 /* Could sort here, but pun for now. Should not happen anyroads. */
 170                 if (prevbase > base) {
 171                         printk(KERN_ERR "Node map not sorted %lx,%lx\n",
 172                                prevbase, base);
 173                         return -1;
 174                 }
 175
 176                 printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
 177                        nodeid, base, limit);
 178
 179                 found++;
 180
 181                 nodes[nodeid].start = base;
 182                 nodes[nodeid].end = limit;
 183                 e820_register_active_regions(nodeid,
 184                                 nodes[nodeid].start >> PAGE_SHIFT,
 185                                 nodes[nodeid].end >> PAGE_SHIFT);
 186
 187                 prevbase = base;
 188
 189                 node_set(nodeid, node_possible_map);
 190         }
 191
 192         if (!found)
 193                 return -1;
 194
 195         memnode_shift = compute_hash_shift(nodes, 8, NULL);
 196         if (memnode_shift < 0) {
 197                 printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
 198                 return -1;
 199         }
 200         printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
 201
 202         /* use the coreid bits from early_identify_cpu */
 203         bits = boot_cpu_data.x86_coreid_bits;
 204         cores = (1<<bits);
 205         apicid_base = 0;
 206         /* need to get boot_cpu_id early for system with apicid lifting */
 207         early_get_boot_cpu_id();
 208         if (boot_cpu_physical_apicid > 0) {
 209                 printk(KERN_INFO "BSP APIC ID: %02x\n",
 210                                  boot_cpu_physical_apicid);
 211                 apicid_base = boot_cpu_physical_apicid;
 212         }
 213
 214         for (i = 0; i < 8; i++) {
 215                 if (nodes[i].start != nodes[i].end) {
 216                         nodeid = nodeids[i];
 217                         for (j = apicid_base; j < cores + apicid_base; j++)
 218                                 apicid_to_node[(nodeid << bits) + j] = i;
 219                         setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 220                 }
 221         }
 222
 223         numa_init_array();
 224         return 0;
 225 }