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();
72 int __init amd_numa_init(unsigned long start_pfn, unsigned long end_pfn)
74 unsigned long start = PFN_PHYS(start_pfn);
75 unsigned long end = PFN_PHYS(end_pfn);
77 unsigned long prevbase;
81 if (!early_pci_allowed())
84 nb = find_northbridge();
88 pr_info("Scanning NUMA topology in Northbridge %d\n", nb);
90 reg = read_pci_config(0, nb, 0, 0x60);
91 numnodes = ((reg >> 4) & 0xF) + 1;
95 pr_info("Number of physical nodes %d\n", numnodes);
98 for (i = 0; i < 8; i++) {
99 unsigned long base, limit;
101 base = read_pci_config(0, nb, 1, 0x40 + i*8);
102 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
104 nodeids[i] = nodeid = limit & 7;
105 if ((base & 3) == 0) {
107 pr_info("Skipping disabled node %d\n", i);
110 if (nodeid >= numnodes) {
111 pr_info("Ignoring excess node %d (%lx:%lx)\n", nodeid,
117 pr_info("Skipping node entry %d (base %lx)\n",
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);
126 if (node_isset(nodeid, nodes_parsed)) {
127 pr_info("Node %d already present, skipping\n",
150 pr_err("Empty node %d\n", nodeid);
154 pr_err("Node %d bogus settings %lx-%lx.\n",
155 nodeid, base, limit);
159 /* Could sort here, but pun for now. Should not happen anyroads. */
160 if (prevbase > base) {
161 pr_err("Node map not sorted %lx,%lx\n",
166 pr_info("Node %d MemBase %016lx Limit %016lx\n",
167 nodeid, base, limit);
171 nodes[nodeid].start = base;
172 nodes[nodeid].end = limit;
176 node_set(nodeid, nodes_parsed);
184 #ifdef CONFIG_NUMA_EMU
185 static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
186 [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
189 void __init amd_get_nodes(struct bootnode *physnodes)
193 for_each_node_mask(i, nodes_parsed) {
194 physnodes[i].start = nodes[i].start;
195 physnodes[i].end = nodes[i].end;
199 static int __init find_node_by_addr(unsigned long addr)
201 int ret = NUMA_NO_NODE;
204 for (i = 0; i < 8; i++)
205 if (addr >= nodes[i].start && addr < nodes[i].end) {
213 * For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
214 * setup to represent the physical topology but reflect the emulated
215 * environment. For each emulated node, the real node which it appears on is
216 * found and a fake pxm to nid mapping is created which mirrors the actual
217 * locality. node_distance() then represents the correct distances between
218 * emulated nodes by using the fake acpi mappings to pxms.
220 void __init amd_fake_nodes(const struct bootnode *nodes, int nr_nodes)
224 unsigned int apicid_base = 0;
227 bits = boot_cpu_data.x86_coreid_bits;
229 early_get_boot_cpu_id();
230 if (boot_cpu_physical_apicid > 0)
231 apicid_base = boot_cpu_physical_apicid;
233 for (i = 0; i < nr_nodes; i++) {
238 nid = find_node_by_addr(nodes[i].start);
239 if (nid == NUMA_NO_NODE)
242 index = nodeids[nid] << bits;
243 if (fake_apicid_to_node[index + apicid_base] == NUMA_NO_NODE)
244 for (j = apicid_base; j < cores + apicid_base; j++)
245 fake_apicid_to_node[index + j] = i;
246 #ifdef CONFIG_ACPI_NUMA
247 __acpi_map_pxm_to_node(nid, i);
250 memcpy(apicid_to_node, fake_apicid_to_node, sizeof(apicid_to_node));
252 #endif /* CONFIG_NUMA_EMU */
254 int __init amd_scan_nodes(void)
258 unsigned int apicid_base;
261 BUG_ON(nodes_empty(nodes_parsed));
262 node_possible_map = nodes_parsed;
263 memnode_shift = compute_hash_shift(nodes, 8, NULL);
264 if (memnode_shift < 0) {
265 pr_err("No NUMA node hash function found. Contact maintainer\n");
268 pr_info("Using node hash shift of %d\n", memnode_shift);
270 /* use the coreid bits from early_identify_cpu */
271 bits = boot_cpu_data.x86_coreid_bits;
274 /* get the APIC ID of the BSP early for systems with apicid lifting */
275 early_get_boot_cpu_id();
276 if (boot_cpu_physical_apicid > 0) {
277 pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
278 apicid_base = boot_cpu_physical_apicid;
281 for_each_node_mask(i, node_possible_map) {
284 memblock_x86_register_active_regions(i,
285 nodes[i].start >> PAGE_SHIFT,
286 nodes[i].end >> PAGE_SHIFT);
287 for (j = apicid_base; j < cores + apicid_base; j++)
288 apicid_to_node[(i << bits) + j] = i;
289 setup_node_bootmem(i, nodes[i].start, nodes[i].end);