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 #include <linux/bootmem.h> 16 17 #include <asm/io.h> 18 #include <linux/pci_ids.h> 19 #include <linux/acpi.h> 20 #include <asm/types.h> 21 #include <asm/mmzone.h> 22 #include <asm/proto.h> 23 #include <asm/e820.h> 24 #include <asm/pci-direct.h> 25 #include <asm/numa.h> 26 #include <asm/mpspec.h> 27 #include <asm/apic.h> 28 #include <asm/amd_nb.h> 29 30 static unsigned char __initdata nodeids[8]; 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 -ENOENT; 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_numa_init(void) 72 { 73 u64 start = PFN_PHYS(0); 74 u64 end = PFN_PHYS(max_pfn); 75 unsigned numnodes; 76 u64 prevbase; 77 int i, j, nb; 78 u32 nodeid, reg; 79 unsigned int bits, cores, apicid_base; 80 81 if (!early_pci_allowed()) 82 return -EINVAL; 83 84 nb = find_northbridge(); 85 if (nb < 0) 86 return nb; 87 88 pr_info("Scanning NUMA topology in Northbridge %d\n", nb); 89 90 reg = read_pci_config(0, nb, 0, 0x60); 91 numnodes = ((reg >> 4) & 0xF) + 1; 92 if (numnodes <= 1) 93 return -ENOENT; 94 95 pr_info("Number of physical nodes %d\n", numnodes); 96 97 prevbase = 0; 98 for (i = 0; i < 8; i++) { 99 u64 base, limit; 100 101 base = read_pci_config(0, nb, 1, 0x40 + i*8); 102 limit = read_pci_config(0, nb, 1, 0x44 + i*8); 103 104 nodeids[i] = nodeid = limit & 7; 105 if ((base & 3) == 0) { 106 if (i < numnodes) 107 pr_info("Skipping disabled node %d\n", i); 108 continue; 109 } 110 if (nodeid >= numnodes) { 111 pr_info("Ignoring excess node %d (%Lx:%Lx)\n", nodeid, 112 base, limit); 113 continue; 114 } 115 116 if (!limit) { 117 pr_info("Skipping node entry %d (base %Lx)\n", 118 i, base); 119 continue; 120 } 121 if ((base >> 8) & 3 || (limit >> 8) & 3) { 122 pr_err("Node %d using interleaving mode %Lx/%Lx\n", 123 nodeid, (base >> 8) & 3, (limit >> 8) & 3); 124 return -EINVAL; 125 } 126 if (node_isset(nodeid, numa_nodes_parsed)) { 127 pr_info("Node %d already present, skipping\n", 128 nodeid); 129 continue; 130 } 131 132 limit >>= 16; 133 limit++; 134 limit <<= 24; 135 136 if (limit > end) 137 limit = end; 138 if (limit <= base) 139 continue; 140 141 base >>= 16; 142 base <<= 24; 143 144 if (base < start) 145 base = start; 146 if (limit > end) 147 limit = end; 148 if (limit == base) { 149 pr_err("Empty node %d\n", nodeid); 150 continue; 151 } 152 if (limit < base) { 153 pr_err("Node %d bogus settings %Lx-%Lx.\n", 154 nodeid, base, limit); 155 continue; 156 } 157 158 /* Could sort here, but pun for now. Should not happen anyroads. */ 159 if (prevbase > base) { 160 pr_err("Node map not sorted %Lx,%Lx\n", 161 prevbase, base); 162 return -EINVAL; 163 } 164 165 pr_info("Node %d MemBase %016Lx Limit %016Lx\n", 166 nodeid, base, limit); 167 168 prevbase = base; 169 numa_add_memblk(nodeid, base, limit); 170 node_set(nodeid, numa_nodes_parsed); 171 } 172 173 if (!nodes_weight(numa_nodes_parsed)) 174 return -ENOENT; 175 176 /* 177 * We seem to have valid NUMA configuration. Map apicids to nodes 178 * using the coreid bits from early_identify_cpu. 179 */ 180 bits = boot_cpu_data.x86_coreid_bits; 181 cores = 1 << bits; 182 apicid_base = 0; 183 184 /* get the APIC ID of the BSP early for systems with apicid lifting */ 185 early_get_boot_cpu_id(); 186 if (boot_cpu_physical_apicid > 0) { 187 pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid); 188 apicid_base = boot_cpu_physical_apicid; 189 } 190 191 for_each_node_mask(i, numa_nodes_parsed) 192 for (j = apicid_base; j < cores + apicid_base; j++) 193 set_apicid_to_node((i << bits) + j, i); 194 195 return 0; 196 } 197