3 * Discover the memory map and associated nodes.
5 * This version reads it directly from the AMD northbridge.
7 * Copyright 2002,2003 Andi Kleen, SuSE Labs.
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/string.h>
12 #include <linux/nodemask.h>
13 #include <linux/memblock.h>
14 #include <linux/bootmem.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>
23 #include <asm/pci-direct.h>
25 #include <asm/mpspec.h>
27 #include <asm/amd_nb.h>
29 static unsigned char __initdata nodeids[8];
31 static __init int find_northbridge(void)
35 for (num = 0; num < 32; num++) {
38 header = read_pci_config(0, num, 0, 0x00);
39 if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
40 header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
41 header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
44 header = read_pci_config(0, num, 1, 0x00);
45 if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
46 header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
47 header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
55 static __init void early_get_boot_cpu_id(void)
58 * need to get the APIC ID of the BSP so can use that to
59 * create apicid_to_node in amd_scan_nodes()
61 #ifdef CONFIG_X86_MPPARSE
63 * get boot-time SMP configuration:
66 early_get_smp_config();
70 int __init amd_numa_init(void)
72 u64 start = PFN_PHYS(0);
73 u64 end = PFN_PHYS(max_pfn);
78 unsigned int bits, cores, apicid_base;
80 if (!early_pci_allowed())
83 nb = find_northbridge();
87 pr_info("Scanning NUMA topology in Northbridge %d\n", nb);
89 reg = read_pci_config(0, nb, 0, 0x60);
90 numnodes = ((reg >> 4) & 0xF) + 1;
94 pr_info("Number of physical nodes %d\n", numnodes);
97 for (i = 0; i < 8; i++) {
100 base = read_pci_config(0, nb, 1, 0x40 + i*8);
101 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
103 nodeids[i] = nodeid = limit & 7;
104 if ((base & 3) == 0) {
106 pr_info("Skipping disabled node %d\n", i);
109 if (nodeid >= numnodes) {
110 pr_info("Ignoring excess node %d (%Lx:%Lx)\n", nodeid,
116 pr_info("Skipping node entry %d (base %Lx)\n",
120 if ((base >> 8) & 3 || (limit >> 8) & 3) {
121 pr_err("Node %d using interleaving mode %Lx/%Lx\n",
122 nodeid, (base >> 8) & 3, (limit >> 8) & 3);
125 if (node_isset(nodeid, numa_nodes_parsed)) {
126 pr_info("Node %d already present, skipping\n",
148 pr_err("Empty node %d\n", nodeid);
152 pr_err("Node %d bogus settings %Lx-%Lx.\n",
153 nodeid, base, limit);
157 /* Could sort here, but pun for now. Should not happen anyroads. */
158 if (prevbase > base) {
159 pr_err("Node map not sorted %Lx,%Lx\n",
164 pr_info("Node %d MemBase %016Lx Limit %016Lx\n",
165 nodeid, base, limit);
168 numa_add_memblk(nodeid, base, limit);
169 node_set(nodeid, numa_nodes_parsed);
172 if (!nodes_weight(numa_nodes_parsed))
176 * We seem to have valid NUMA configuration. Map apicids to nodes
177 * using the coreid bits from early_identify_cpu.
179 bits = boot_cpu_data.x86_coreid_bits;
183 /* get the APIC ID of the BSP early for systems with apicid lifting */
184 early_get_boot_cpu_id();
185 if (boot_cpu_physical_apicid > 0) {
186 pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
187 apicid_base = boot_cpu_physical_apicid;
190 for_each_node_mask(i, numa_nodes_parsed)
191 for (j = apicid_base; j < cores + apicid_base; j++)
192 set_apicid_to_node((i << bits) + j, i);