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 #ifdef CONFIG_X86_MPPARSE
  61         early_find_smp_config();
  62 #endif
  63 #ifdef CONFIG_ACPI
  64         /*
  65          * Read APIC information from ACPI tables.
  66          */
  67         early_acpi_boot_init();
  68 #endif
  69 #ifdef CONFIG_X86_MPPARSE
  70         /*
  71          * get boot-time SMP configuration:
  72          */
  73         if (smp_found_config)
  74                 early_get_smp_config();
  75 #endif
  76         early_init_lapic_mapping();
  77 }
  78
  79 int __init k8_scan_nodes(unsigned long start, unsigned long end)
  80 {
  81         unsigned numnodes, cores, bits, apicid_base;
  82         unsigned long prevbase;
  83         struct bootnode nodes[8];
  84         unsigned char nodeids[8];
  85         int i, j, nb, found = 0;
  86         u32 nodeid, reg;
  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
 109                 base = read_pci_config(0, nb, 1, 0x40 + i*8);
 110                 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 111
 112                 nodeid = limit & 7;
 113                 nodeids[i] = nodeid;
 114                 if ((base & 3) == 0) {
 115                         if (i < numnodes)
 116                                 printk("Skipping disabled node %d\n", i);
 117                         continue;
 118                 }
 119                 if (nodeid >= numnodes) {
 120                         printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
 121                                base, limit);
 122                         continue;
 123                 }
 124
 125                 if (!limit) {
 126                         printk(KERN_INFO "Skipping node entry %d (base %lx)\n",
 127                                i, base);
 128                         continue;
 129                 }
 130                 if ((base >> 8) & 3 || (limit >> 8) & 3) {
 131                         printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
 132                                nodeid, (base>>8)&3, (limit>>8) & 3);
 133                         return -1;
 134                 }
 135                 if (node_isset(nodeid, node_possible_map)) {
 136                         printk(KERN_INFO "Node %d already present. Skipping\n",
 137                                nodeid);
 138                         continue;
 139                 }
 140
 141                 limit >>= 16;
 142                 limit <<= 24;
 143                 limit |= (1<<24)-1;
 144                 limit++;
 145
 146                 if (limit > max_pfn << PAGE_SHIFT)
 147                         limit = max_pfn << PAGE_SHIFT;
 148                 if (limit <= base)
 149                         continue;
 150
 151                 base >>= 16;
 152                 base <<= 24;
 153
 154                 if (base < start)
 155                         base = start;
 156                 if (limit > end)
 157                         limit = end;
 158                 if (limit == base) {
 159                         printk(KERN_ERR "Empty node %d\n", nodeid);
 160                         continue;
 161                 }
 162                 if (limit < base) {
 163                         printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
 164                                nodeid, base, limit);
 165                         continue;
 166                 }
 167
 168                 /* Could sort here, but pun for now. Should not happen anyroads. */
 169                 if (prevbase > base) {
 170                         printk(KERN_ERR "Node map not sorted %lx,%lx\n",
 171                                prevbase, base);
 172                         return -1;
 173                 }
 174
 175                 printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
 176                        nodeid, base, limit);
 177
 178                 found++;
 179
 180                 nodes[nodeid].start = base;
 181                 nodes[nodeid].end = limit;
 182                 e820_register_active_regions(nodeid,
 183                                 nodes[nodeid].start >> PAGE_SHIFT,
 184                                 nodes[nodeid].end >> PAGE_SHIFT);
 185
 186                 prevbase = base;
 187
 188                 node_set(nodeid, node_possible_map);
 189         }
 190
 191         if (!found)
 192                 return -1;
 193
 194         memnode_shift = compute_hash_shift(nodes, 8, NULL);
 195         if (memnode_shift < 0) {
 196                 printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
 197                 return -1;
 198         }
 199         printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
 200
 201         /* use the coreid bits from early_identify_cpu */
 202         bits = boot_cpu_data.x86_coreid_bits;
 203         cores = (1<<bits);
 204         apicid_base = 0;
 205         /* need to get boot_cpu_id early for system with apicid lifting */
 206         early_get_boot_cpu_id();
 207         if (boot_cpu_physical_apicid > 0) {
 208                 printk(KERN_INFO "BSP APIC ID: %02x\n",
 209                                  boot_cpu_physical_apicid);
 210                 apicid_base = boot_cpu_physical_apicid;
 211         }
 212
 213         for (i = 0; i < 8; i++) {
 214                 if (nodes[i].start != nodes[i].end) {
 215                         nodeid = nodeids[i];
 216                         for (j = apicid_base; j < cores + apicid_base; j++)
 217                                 apicid_to_node[(nodeid << bits) + j] = i;
 218                         setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 219                 }
 220         }
 221
 222         numa_init_array();
 223         return 0;
 224 }