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         int i, j, nb, found = 0;
  85         u32 nodeid, reg;
  86
  87         if (!early_pci_allowed())
  88                 return -1;
  89
  90         nb = find_northbridge();
  91         if (nb < 0)
  92                 return nb;
  93
  94         printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
  95
  96         reg = read_pci_config(0, nb, 0, 0x60);
  97         numnodes = ((reg >> 4) & 0xF) + 1;
  98         if (numnodes <= 1)
  99                 return -1;
 100
 101         printk(KERN_INFO "Number of nodes %d\n", numnodes);
 102
 103         memset(&nodes, 0, sizeof(nodes));
 104         prevbase = 0;
 105         for (i = 0; i < 8; i++) {
 106                 unsigned long base, limit;
 107
 108                 base = read_pci_config(0, nb, 1, 0x40 + i*8);
 109                 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 110
 111                 nodeid = limit & 7;
 112                 if ((base & 3) == 0) {
 113                         if (i < numnodes)
 114                                 printk("Skipping disabled node %d\n", i);
 115                         continue;
 116                 }
 117                 if (nodeid >= numnodes) {
 118                         printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
 119                                base, limit);
 120                         continue;
 121                 }
 122
 123                 if (!limit) {
 124                         printk(KERN_INFO "Skipping node entry %d (base %lx)\n",
 125                                i, base);
 126                         continue;
 127                 }
 128                 if ((base >> 8) & 3 || (limit >> 8) & 3) {
 129                         printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
 130                                nodeid, (base>>8)&3, (limit>>8) & 3);
 131                         return -1;
 132                 }
 133                 if (node_isset(nodeid, node_possible_map)) {
 134                         printk(KERN_INFO "Node %d already present. Skipping\n",
 135                                nodeid);
 136                         continue;
 137                 }
 138
 139                 limit >>= 16;
 140                 limit <<= 24;
 141                 limit |= (1<<24)-1;
 142                 limit++;
 143
 144                 if (limit > max_pfn << PAGE_SHIFT)
 145                         limit = max_pfn << PAGE_SHIFT;
 146                 if (limit <= base)
 147                         continue;
 148
 149                 base >>= 16;
 150                 base <<= 24;
 151
 152                 if (base < start)
 153                         base = start;
 154                 if (limit > end)
 155                         limit = end;
 156                 if (limit == base) {
 157                         printk(KERN_ERR "Empty node %d\n", nodeid);
 158                         continue;
 159                 }
 160                 if (limit < base) {
 161                         printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
 162                                nodeid, base, limit);
 163                         continue;
 164                 }
 165
 166                 /* Could sort here, but pun for now. Should not happen anyroads. */
 167                 if (prevbase > base) {
 168                         printk(KERN_ERR "Node map not sorted %lx,%lx\n",
 169                                prevbase, base);
 170                         return -1;
 171                 }
 172
 173                 printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
 174                        nodeid, base, limit);
 175
 176                 found++;
 177
 178                 nodes[nodeid].start = base;
 179                 nodes[nodeid].end = limit;
 180
 181                 prevbase = base;
 182
 183                 node_set(nodeid, node_possible_map);
 184         }
 185
 186         if (!found)
 187                 return -1;
 188
 189         memnode_shift = compute_hash_shift(nodes, 8, NULL);
 190         if (memnode_shift < 0) {
 191                 printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
 192                 return -1;
 193         }
 194         printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
 195
 196         /* use the coreid bits from early_identify_cpu */
 197         bits = boot_cpu_data.x86_coreid_bits;
 198         cores = (1<<bits);
 199         apicid_base = 0;
 200         /* need to get boot_cpu_id early for system with apicid lifting */
 201         early_get_boot_cpu_id();
 202         if (boot_cpu_physical_apicid > 0) {
 203                 printk(KERN_INFO "BSP APIC ID: %02x\n",
 204                                  boot_cpu_physical_apicid);
 205                 apicid_base = boot_cpu_physical_apicid;
 206         }
 207
 208         for (i = 0; i < 8; i++) {
 209                 if (nodes[i].start == nodes[i].end)
 210                         continue;
 211
 212                 e820_register_active_regions(i,
 213                                 nodes[i].start >> PAGE_SHIFT,
 214                                 nodes[i].end >> PAGE_SHIFT);
 215                 for (j = apicid_base; j < cores + apicid_base; j++)
 216                         apicid_to_node[(i << bits) + j] = i;
 217                 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 218         }
 219
 220         numa_init_array();
 221         return 0;
 222 }