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 #include <asm/k8.h>
  26
  27 static __init int find_northbridge(void)
  28 {
  29         int num;
  30
  31         for (num = 0; num < 32; num++) {
  32                 u32 header;
  33
  34                 header = read_pci_config(0, num, 0, 0x00);
  35                 if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
  36                         header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
  37                         header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
  38                         continue;
  39
  40                 header = read_pci_config(0, num, 1, 0x00);
  41                 if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
  42                         header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
  43                         header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
  44                         continue;
  45                 return num;
  46         }
  47
  48         return -1;
  49 }
  50
  51 static __init void early_get_boot_cpu_id(void)
  52 {
  53         /*
  54          * need to get boot_cpu_id so can use that to create apicid_to_node
  55          * in k8_scan_nodes()
  56          */
  57         /*
  58          * Find possible boot-time SMP configuration:
  59          */
  60         early_find_smp_config();
  61 #ifdef CONFIG_ACPI
  62         /*
  63          * Read APIC information from ACPI tables.
  64          */
  65         early_acpi_boot_init();
  66 #endif
  67         /*
  68          * get boot-time SMP configuration:
  69          */
  70         if (smp_found_config)
  71                 early_get_smp_config();
  72         early_init_lapic_mapping();
  73 }
  74
  75 int __init k8_scan_nodes(unsigned long start, unsigned long end)
  76 {
  77         unsigned long prevbase;
  78         struct bootnode nodes[8];
  79         int nodeid, i, nb;
  80         unsigned char nodeids[8];
  81         int found = 0;
  82         u32 reg;
  83         unsigned numnodes;
  84         unsigned cores;
  85         unsigned bits;
  86         int j;
  87         unsigned apicid_base;
  88
  89         if (!early_pci_allowed())
  90                 return -1;
  91
  92         nb = find_northbridge();
  93         if (nb < 0)
  94                 return nb;
  95
  96         printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
  97
  98         reg = read_pci_config(0, nb, 0, 0x60);
  99         numnodes = ((reg >> 4) & 0xF) + 1;
 100         if (numnodes <= 1)
 101                 return -1;
 102
 103         printk(KERN_INFO "Number of nodes %d\n", numnodes);
 104
 105         memset(&nodes, 0, sizeof(nodes));
 106         prevbase = 0;
 107         for (i = 0; i < 8; i++) {
 108                 unsigned long base, limit;
 109                 u32 nodeid;
 110
 111                 base = read_pci_config(0, nb, 1, 0x40 + i*8);
 112                 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 113
 114                 nodeid = limit & 7;
 115                 nodeids[i] = nodeid;
 116                 if ((base & 3) == 0) {
 117                         if (i < numnodes)
 118                                 printk("Skipping disabled node %d\n", i);
 119                         continue;
 120                 }
 121                 if (nodeid >= numnodes) {
 122                         printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
 123                                base, limit);
 124                         continue;
 125                 }
 126
 127                 if (!limit) {
 128                         printk(KERN_INFO "Skipping node entry %d (base %lx)\n",
 129                                i, base);
 130                         continue;
 131                 }
 132                 if ((base >> 8) & 3 || (limit >> 8) & 3) {
 133                         printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
 134                                nodeid, (base>>8)&3, (limit>>8) & 3);
 135                         return -1;
 136                 }
 137                 if (node_isset(nodeid, node_possible_map)) {
 138                         printk(KERN_INFO "Node %d already present. Skipping\n",
 139                                nodeid);
 140                         continue;
 141                 }
 142
 143                 limit >>= 16;
 144                 limit <<= 24;
 145                 limit |= (1<<24)-1;
 146                 limit++;
 147
 148                 if (limit > end_pfn << PAGE_SHIFT)
 149                         limit = end_pfn << PAGE_SHIFT;
 150                 if (limit <= base)
 151                         continue;
 152
 153                 base >>= 16;
 154                 base <<= 24;
 155
 156                 if (base < start)
 157                         base = start;
 158                 if (limit > end)
 159                         limit = end;
 160                 if (limit == base) {
 161                         printk(KERN_ERR "Empty node %d\n", nodeid);
 162                         continue;
 163                 }
 164                 if (limit < base) {
 165                         printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
 166                                nodeid, base, limit);
 167                         continue;
 168                 }
 169
 170                 /* Could sort here, but pun for now. Should not happen anyroads. */
 171                 if (prevbase > base) {
 172                         printk(KERN_ERR "Node map not sorted %lx,%lx\n",
 173                                prevbase, base);
 174                         return -1;
 175                 }
 176
 177                 printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
 178                        nodeid, base, limit);
 179
 180                 found++;
 181
 182                 nodes[nodeid].start = base;
 183                 nodes[nodeid].end = limit;
 184                 e820_register_active_regions(nodeid,
 185                                 nodes[nodeid].start >> PAGE_SHIFT,
 186                                 nodes[nodeid].end >> PAGE_SHIFT);
 187
 188                 prevbase = base;
 189
 190                 node_set(nodeid, node_possible_map);
 191         }
 192
 193         if (!found)
 194                 return -1;
 195
 196         memnode_shift = compute_hash_shift(nodes, 8, NULL);
 197         if (memnode_shift < 0) {
 198                 printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
 199                 return -1;
 200         }
 201         printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
 202
 203         /* use the coreid bits from early_identify_cpu */
 204         bits = boot_cpu_data.x86_coreid_bits;
 205         cores = (1<<bits);
 206         apicid_base = 0;
 207         /* need to get boot_cpu_id early for system with apicid lifting */
 208         early_get_boot_cpu_id();
 209         if (boot_cpu_physical_apicid > 0) {
 210                 printk(KERN_INFO "BSP APIC ID: %02x\n",
 211                                  boot_cpu_physical_apicid);
 212                 apicid_base = boot_cpu_physical_apicid;
 213         }
 214
 215         for (i = 0; i < 8; i++) {
 216                 if (nodes[i].start != nodes[i].end) {
 217                         nodeid = nodeids[i];
 218                         for (j = apicid_base; j < cores + apicid_base; j++)
 219                                 apicid_to_node[(nodeid << bits) + j] = i;
 220                         setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 221                 }
 222         }
 223
 224         numa_init_array();
 225         return 0;
 226 }