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/module.h>
13 #include <linux/nodemask.h>
14 #include <linux/memblock.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 struct bootnode __initdata nodes[8];
30 static unsigned char __initdata nodeids[8];
31 static nodemask_t __initdata nodes_parsed = NODE_MASK_NONE;
33 static __init int find_northbridge(void)
37 for (num = 0; num < 32; num++) {
40 header = read_pci_config(0, num, 0, 0x00);
41 if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
42 header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
43 header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
46 header = read_pci_config(0, num, 1, 0x00);
47 if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
48 header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
49 header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
57 static __init void early_get_boot_cpu_id(void)
60 * need to get the APIC ID of the BSP so can use that to
61 * create apicid_to_node in amd_scan_nodes()
63 #ifdef CONFIG_X86_MPPARSE
65 * get boot-time SMP configuration:
68 early_get_smp_config();
70 early_init_lapic_mapping();
73 int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
75 unsigned long start = PFN_PHYS(start_pfn);
76 unsigned long end = PFN_PHYS(end_pfn);
78 unsigned long prevbase;
82 if (!early_pci_allowed())
85 nb = find_northbridge();
89 pr_info("Scanning NUMA topology in Northbridge %d\n", nb);
91 reg = read_pci_config(0, nb, 0, 0x60);
92 numnodes = ((reg >> 4) & 0xF) + 1;
96 pr_info("Number of physical nodes %d\n", numnodes);
99 for (i = 0; i < 8; i++) {
100 unsigned long base, limit;
102 base = read_pci_config(0, nb, 1, 0x40 + i*8);
103 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
105 nodeids[i] = nodeid = limit & 7;
106 if ((base & 3) == 0) {
108 pr_info("Skipping disabled node %d\n", i);
111 if (nodeid >= numnodes) {
112 pr_info("Ignoring excess node %d (%lx:%lx)\n", nodeid,
118 pr_info("Skipping node entry %d (base %lx)\n",
122 if ((base >> 8) & 3 || (limit >> 8) & 3) {
123 pr_err("Node %d using interleaving mode %lx/%lx\n",
124 nodeid, (base >> 8) & 3, (limit >> 8) & 3);
127 if (node_isset(nodeid, nodes_parsed)) {
128 pr_info("Node %d already present, skipping\n",
151 pr_err("Empty node %d\n", nodeid);
155 pr_err("Node %d bogus settings %lx-%lx.\n",
156 nodeid, base, limit);
160 /* Could sort here, but pun for now. Should not happen anyroads. */
161 if (prevbase > base) {
162 pr_err("Node map not sorted %lx,%lx\n",
167 pr_info("Node %d MemBase %016lx Limit %016lx\n",
168 nodeid, base, limit);
172 nodes[nodeid].start = base;
173 nodes[nodeid].end = limit;
177 node_set(nodeid, nodes_parsed);
185 #ifdef CONFIG_NUMA_EMU
186 static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
187 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
190 int __init amd_get_nodes(struct bootnode *physnodes)
195 for_each_node_mask(i, nodes_parsed) {
196 physnodes[ret].start = nodes[i].start;
197 physnodes[ret].end = nodes[i].end;
203 static int __init find_node_by_addr(unsigned long addr)
205 int ret = NUMA_NO_NODE;
208 for (i = 0; i < 8; i++)
209 if (addr >= nodes[i].start && addr < nodes[i].end) {
217 * For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
218 * setup to represent the physical topology but reflect the emulated
219 * environment. For each emulated node, the real node which it appears on is
220 * found and a fake pxm to nid mapping is created which mirrors the actual
221 * locality. node_distance() then represents the correct distances between
222 * emulated nodes by using the fake acpi mappings to pxms.
224 void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
228 unsigned int apicid_base = 0;
231 bits = boot_cpu_data.x86_coreid_bits;
233 early_get_boot_cpu_id();
234 if (boot_cpu_physical_apicid > 0)
235 apicid_base = boot_cpu_physical_apicid;
237 for (i = 0; i < nr_nodes; i++) {
242 nid = find_node_by_addr(nodes[i].start);
243 if (nid == NUMA_NO_NODE)
246 index = nodeids[nid] << bits;
247 if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)
248 for (j = apicid_base; j < cores + apicid_base; j++)
249 fake_apicid_to_node[index + j] = i;
250 #ifdef CONFIG_ACPI_NUMA
251 __acpi_map_pxm_to_node(nid, i);
254 memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
256 #endif /* CONFIG_NUMA_EMU */
258 int __init amd_scan_nodes(void)
262 unsigned int apicid_base;
265 BUG_ON(nodes_empty(nodes_parsed));
266 node_possible_map = nodes_parsed;
267 memnode_shift = compute_hash_shift(nodes, 8, NULL);
268 if (memnode_shift < 0) {
269 pr_err("No NUMA node hash function found. Contact maintainer\n");
272 pr_info("Using node hash shift of %d\n", memnode_shift);
274 /* use the coreid bits from early_identify_cpu */
275 bits = boot_cpu_data.x86_coreid_bits;
278 /* get the APIC ID of the BSP early for systems with apicid lifting */
279 early_get_boot_cpu_id();
280 if (boot_cpu_physical_apicid > 0) {
281 pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
282 apicid_base = boot_cpu_physical_apicid;
285 for_each_node_mask(i, node_possible_map) {
288 memblock_x86_register_active_regions(i,
289 nodes[i].start >> PAGE_SHIFT,
290 nodes[i].end >> PAGE_SHIFT);
291 for (j = apicid_base; j < cores + apicid_base; j++)
292 apicid_to_node[(i << bits) + j] = i;
293 setup_node_bootmem(i, nodes[i].start, nodes[i].end);