arch/x86/mm/amdtopology_64.c

   1 /*
   2  * AMD NUMA support.
   3  * Discover the memory map and associated nodes.
   4  *
   5  * This version reads it directly from the AMD 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 <linux/memblock.h>
  15
  16 #include <asm/io.h>
  17 #include <linux/pci_ids.h>
  18 #include <linux/acpi.h>
  19 #include <asm/types.h>
  20 #include <asm/mmzone.h>
  21 #include <asm/proto.h>
  22 #include <asm/e820.h>
  23 #include <asm/pci-direct.h>
  24 #include <asm/numa.h>
  25 #include <asm/mpspec.h>
  26 #include <asm/apic.h>
  27 #include <asm/amd_nb.h>
  28
  29 static struct bootnode __initdata nodes[8];
  30 static nodemask_t __initdata nodes_parsed = NODE_MASK_NONE;
  31
  32 static __init int find_northbridge(void)
  33 {
  34         int num;
  35
  36         for (num = 0; num < 32; num++) {
  37                 u32 header;
  38
  39                 header = read_pci_config(0, num, 0, 0x00);
  40                 if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
  41                         header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
  42                         header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
  43                         continue;
  44
  45                 header = read_pci_config(0, num, 1, 0x00);
  46                 if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
  47                         header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
  48                         header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
  49                         continue;
  50                 return num;
  51         }
  52
  53         return -1;
  54 }
  55
  56 static __init void early_get_boot_cpu_id(void)
  57 {
  58         /*
  59          * need to get the APIC ID of the BSP so can use that to
  60          * create apicid_to_node in amd_scan_nodes()
  61          */
  62 #ifdef CONFIG_X86_MPPARSE
  63         /*
  64          * get boot-time SMP configuration:
  65          */
  66         if (smp_found_config)
  67                 early_get_smp_config();
  68 #endif
  69 }
  70
  71 int __init amd_get_nodes(struct bootnode *physnodes)
  72 {
  73         int i;
  74         int ret = 0;
  75
  76         for_each_node_mask(i, nodes_parsed) {
  77                 physnodes[ret].start = nodes[i].start;
  78                 physnodes[ret].end = nodes[i].end;
  79                 ret++;
  80         }
  81         return ret;
  82 }
  83
  84 int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
  85 {
  86         unsigned long start = PFN_PHYS(start_pfn);
  87         unsigned long end = PFN_PHYS(end_pfn);
  88         unsigned numnodes;
  89         unsigned long prevbase;
  90         int i, nb, found = 0;
  91         u32 nodeid, reg;
  92
  93         if (!early_pci_allowed())
  94                 return -1;
  95
  96         nb = find_northbridge();
  97         if (nb < 0)
  98                 return nb;
  99
 100         pr_info("Scanning NUMA topology in Northbridge %d\n", nb);
 101
 102         reg = read_pci_config(0, nb, 0, 0x60);
 103         numnodes = ((reg >> 4) & 0xF) + 1;
 104         if (numnodes <= 1)
 105                 return -1;
 106
 107         pr_info("Number of physical nodes %d\n", numnodes);
 108
 109         prevbase = 0;
 110         for (i = 0; i < 8; i++) {
 111                 unsigned long base, limit;
 112
 113                 base = read_pci_config(0, nb, 1, 0x40 + i*8);
 114                 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 115
 116                 nodeid = limit & 7;
 117                 if ((base & 3) == 0) {
 118                         if (i < numnodes)
 119                                 pr_info("Skipping disabled node %d\n", i);
 120                         continue;
 121                 }
 122                 if (nodeid >= numnodes) {
 123                         pr_info("Ignoring excess node %d (%lx:%lx)\n", nodeid,
 124                                 base, limit);
 125                         continue;
 126                 }
 127
 128                 if (!limit) {
 129                         pr_info("Skipping node entry %d (base %lx)\n",
 130                                 i, base);
 131                         continue;
 132                 }
 133                 if ((base >> 8) & 3 || (limit >> 8) & 3) {
 134                         pr_err("Node %d using interleaving mode %lx/%lx\n",
 135                                nodeid, (base >> 8) & 3, (limit >> 8) & 3);
 136                         return -1;
 137                 }
 138                 if (node_isset(nodeid, nodes_parsed)) {
 139                         pr_info("Node %d already present, skipping\n",
 140                                 nodeid);
 141                         continue;
 142                 }
 143
 144                 limit >>= 16;
 145                 limit <<= 24;
 146                 limit |= (1<<24)-1;
 147                 limit++;
 148
 149                 if (limit > end)
 150                         limit = end;
 151                 if (limit <= base)
 152                         continue;
 153
 154                 base >>= 16;
 155                 base <<= 24;
 156
 157                 if (base < start)
 158                         base = start;
 159                 if (limit > end)
 160                         limit = end;
 161                 if (limit == base) {
 162                         pr_err("Empty node %d\n", nodeid);
 163                         continue;
 164                 }
 165                 if (limit < base) {
 166                         pr_err("Node %d bogus settings %lx-%lx.\n",
 167                                nodeid, base, limit);
 168                         continue;
 169                 }
 170
 171                 /* Could sort here, but pun for now. Should not happen anyroads. */
 172                 if (prevbase > base) {
 173                         pr_err("Node map not sorted %lx,%lx\n",
 174                                prevbase, base);
 175                         return -1;
 176                 }
 177
 178                 pr_info("Node %d MemBase %016lx Limit %016lx\n",
 179                         nodeid, base, limit);
 180
 181                 found++;
 182
 183                 nodes[nodeid].start = base;
 184                 nodes[nodeid].end = limit;
 185
 186                 prevbase = base;
 187
 188                 node_set(nodeid, nodes_parsed);
 189         }
 190
 191         if (!found)
 192                 return -1;
 193         return 0;
 194 }
 195
 196 int __init amd_scan_nodes(void)
 197 {
 198         unsigned int bits;
 199         unsigned int cores;
 200         unsigned int apicid_base;
 201         int i;
 202
 203         BUG_ON(nodes_empty(nodes_parsed));
 204         node_possible_map = nodes_parsed;
 205         memnode_shift = compute_hash_shift(nodes, 8, NULL);
 206         if (memnode_shift < 0) {
 207                 pr_err("No NUMA node hash function found. Contact maintainer\n");
 208                 return -1;
 209         }
 210         pr_info("Using node hash shift of %d\n", memnode_shift);
 211
 212         /* use the coreid bits from early_identify_cpu */
 213         bits = boot_cpu_data.x86_coreid_bits;
 214         cores = (1<<bits);
 215         apicid_base = 0;
 216         /* get the APIC ID of the BSP early for systems with apicid lifting */
 217         early_get_boot_cpu_id();
 218         if (boot_cpu_physical_apicid > 0) {
 219                 pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
 220                 apicid_base = boot_cpu_physical_apicid;
 221         }
 222
 223         for_each_node_mask(i, node_possible_map) {
 224                 int j;
 225
 226                 memblock_x86_register_active_regions(i,
 227                                 nodes[i].start >> PAGE_SHIFT,
 228                                 nodes[i].end >> PAGE_SHIFT);
 229                 for (j = apicid_base; j < cores + apicid_base; j++)
 230                         apicid_to_node[(i << bits) + j] = i;
 231                 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 232         }
 233
 234         numa_init_array();
 235         return 0;
 236 }