1 /*
2 * AMD K8 NUMA support.
3 * Discover the memory map and associated nodes.
4 *
5 * This version reads it directly from the K8 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 <asm/io.h>
15 #include <linux/pci_ids.h>
16 #include <linux/acpi.h>
17 #include <asm/types.h>
18 #include <asm/mmzone.h>
19 #include <asm/proto.h>
20 #include <asm/e820.h>
21 #include <asm/pci-direct.h>
22 #include <asm/numa.h>
23 #include <asm/mpspec.h>
24 #include <asm/apic.h>
25 #include <asm/k8.h>
26
27 static __init int find_northbridge(void)
28 {
29 int num;
30
31 for (num = 0; num < 32; num++) {
32 u32 header;
33
34 header = read_pci_config(0, num, 0, 0x00);
35 if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
36 header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
37 header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
38 continue;
39
40 header = read_pci_config(0, num, 1, 0x00);
41 if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
42 header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
43 header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
44 continue;
45 return num;
46 }
47
48 return -1;
49 }
50
51 static __init void early_get_boot_cpu_id(void)
52 {
53 /*
54 * need to get boot_cpu_id so can use that to create apicid_to_node
55 * in k8_scan_nodes()
56 */
57 /*
58 * Find possible boot-time SMP configuration:
59 */
60 #ifdef CONFIG_X86_MPPARSE
61 early_find_smp_config();
62 #endif
63 #ifdef CONFIG_ACPI
64 /*
65 * Read APIC information from ACPI tables.
66 */
67 early_acpi_boot_init();
68 #endif
69 #ifdef CONFIG_X86_MPPARSE
70 /*
71 * get boot-time SMP configuration:
72 */
73 if (smp_found_config)
74 early_get_smp_config();
75 #endif
76 early_init_lapic_mapping();
77 }
78
79 int __init k8_scan_nodes(unsigned long start, unsigned long end)
80 {
81 unsigned numnodes, cores, bits, apicid_base;
82 unsigned long prevbase;
83 struct bootnode nodes[8];
84 int i, j, nb, found = 0;
85 u32 nodeid, reg;
86
87 if (!early_pci_allowed())
88 return -1;
89
90 nb = find_northbridge();
91 if (nb < 0)
92 return nb;
93
94 printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
95
96 reg = read_pci_config(0, nb, 0, 0x60);
97 numnodes = ((reg >> 4) & 0xF) + 1;
98 if (numnodes <= 1)
99 return -1;
100
101 printk(KERN_INFO "Number of nodes %d\n", numnodes);
102
103 memset(&nodes, 0, sizeof(nodes));
104 prevbase = 0;
105 for (i = 0; i < 8; i++) {
106 unsigned long base, limit;
107
108 base = read_pci_config(0, nb, 1, 0x40 + i*8);
109 limit = read_pci_config(0, nb, 1, 0x44 + i*8);
110
111 nodeid = limit & 7;
112 if ((base & 3) == 0) {
113 if (i < numnodes)
114 printk("Skipping disabled node %d\n", i);
115 continue;
116 }
117 if (nodeid >= numnodes) {
118 printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
119 base, limit);
120 continue;
121 }
122
123 if (!limit) {
124 printk(KERN_INFO "Skipping node entry %d (base %lx)\n",
125 i, base);
126 continue;
127 }
128 if ((base >> 8) & 3 || (limit >> 8) & 3) {
129 printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
130 nodeid, (base>>8)&3, (limit>>8) & 3);
131 return -1;
132 }
133 if (node_isset(nodeid, node_possible_map)) {
134 printk(KERN_INFO "Node %d already present. Skipping\n",
135 nodeid);
136 continue;
137 }
138
139 limit >>= 16;
140 limit <<= 24;
141 limit |= (1<<24)-1;
142 limit++;
143
144 if (limit > max_pfn << PAGE_SHIFT)
145 limit = max_pfn << PAGE_SHIFT;
146 if (limit <= base)
147 continue;
148
149 base >>= 16;
150 base <<= 24;
151
152 if (base < start)
153 base = start;
154 if (limit > end)
155 limit = end;
156 if (limit == base) {
157 printk(KERN_ERR "Empty node %d\n", nodeid);
158 continue;
159 }
160 if (limit < base) {
161 printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
162 nodeid, base, limit);
163 continue;
164 }
165
166 /* Could sort here, but pun for now. Should not happen anyroads. */
167 if (prevbase > base) {
168 printk(KERN_ERR "Node map not sorted %lx,%lx\n",
169 prevbase, base);
170 return -1;
171 }
172
173 printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
174 nodeid, base, limit);
175
176 found++;
177
178 nodes[nodeid].start = base;
179 nodes[nodeid].end = limit;
180
181 prevbase = base;
182
183 node_set(nodeid, node_possible_map);
184 }
185
186 if (!found)
187 return -1;
188
189 memnode_shift = compute_hash_shift(nodes, 8, NULL);
190 if (memnode_shift < 0) {
191 printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
192 return -1;
193 }
194 printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
195
196 /* use the coreid bits from early_identify_cpu */
197 bits = boot_cpu_data.x86_coreid_bits;
198 cores = (1<<bits);
199 apicid_base = 0;
200 /* need to get boot_cpu_id early for system with apicid lifting */
201 early_get_boot_cpu_id();
202 if (boot_cpu_physical_apicid > 0) {
203 printk(KERN_INFO "BSP APIC ID: %02x\n",
204 boot_cpu_physical_apicid);
205 apicid_base = boot_cpu_physical_apicid;
206 }
207
208 for (i = 0; i < 8; i++) {
209 if (nodes[i].start == nodes[i].end)
210 continue;
211
212 e820_register_active_regions(i,
213 nodes[i].start >> PAGE_SHIFT,
214 nodes[i].end >> PAGE_SHIFT);
215 for (j = apicid_base; j < cores + apicid_base; j++)
216 apicid_to_node[(i << bits) + j] = i;
217 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
218 }
219
220 numa_init_array();
221 return 0;
222 }
223
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