Commit | Line | Data |
---|---|---|
3aa88cdf | 1 | /* |
1da177e4 LT |
2 | * AMD K8 NUMA support. |
3 | * Discover the memory map and associated nodes. | |
3aa88cdf | 4 | * |
1da177e4 | 5 | * This version reads it directly from the K8 northbridge. |
3aa88cdf | 6 | * |
1da177e4 LT |
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> | |
cbf9bd60 | 16 | #include <linux/acpi.h> |
1da177e4 LT |
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> | |
cbf9bd60 YL |
23 | #include <asm/mpspec.h> |
24 | #include <asm/apic.h> | |
1da177e4 LT |
25 | |
26 | static __init int find_northbridge(void) | |
27 | { | |
3aa88cdf | 28 | int num; |
1da177e4 | 29 | |
3aa88cdf | 30 | for (num = 0; num < 32; num++) { |
1da177e4 | 31 | u32 header; |
3aa88cdf CM |
32 | |
33 | header = read_pci_config(0, num, 0, 0x00); | |
bb4a1d64 JD |
34 | if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) && |
35 | header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) && | |
36 | header != (PCI_VENDOR_ID_AMD | (0x1300<<16))) | |
3aa88cdf | 37 | continue; |
1da177e4 | 38 | |
3aa88cdf | 39 | header = read_pci_config(0, num, 1, 0x00); |
bb4a1d64 JD |
40 | if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) && |
41 | header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) && | |
42 | header != (PCI_VENDOR_ID_AMD | (0x1301<<16))) | |
3aa88cdf CM |
43 | continue; |
44 | return num; | |
45 | } | |
1da177e4 | 46 | |
3aa88cdf | 47 | return -1; |
1da177e4 LT |
48 | } |
49 | ||
cbf9bd60 YL |
50 | static __init void early_get_boot_cpu_id(void) |
51 | { | |
52 | /* | |
53 | * need to get boot_cpu_id so can use that to create apicid_to_node | |
54 | * in k8_scan_nodes() | |
55 | */ | |
56 | /* | |
57 | * Find possible boot-time SMP configuration: | |
58 | */ | |
59 | early_find_smp_config(); | |
60 | #ifdef CONFIG_ACPI | |
61 | /* | |
62 | * Read APIC information from ACPI tables. | |
63 | */ | |
64 | early_acpi_boot_init(); | |
65 | #endif | |
66 | /* | |
67 | * get boot-time SMP configuration: | |
68 | */ | |
69 | if (smp_found_config) | |
70 | early_get_smp_config(); | |
71 | early_init_lapic_mapping(); | |
72 | } | |
73 | ||
1da177e4 | 74 | int __init k8_scan_nodes(unsigned long start, unsigned long end) |
3aa88cdf | 75 | { |
1da177e4 | 76 | unsigned long prevbase; |
abe059e7 | 77 | struct bootnode nodes[8]; |
3f6e5a12 | 78 | int nodeid, i, nb; |
3f098c26 | 79 | unsigned char nodeids[8]; |
1da177e4 LT |
80 | int found = 0; |
81 | u32 reg; | |
82 | unsigned numnodes; | |
3f6e5a12 YL |
83 | unsigned cores; |
84 | unsigned bits; | |
85 | int j; | |
cbf9bd60 | 86 | unsigned apicid_base; |
1da177e4 | 87 | |
0637a70a AK |
88 | if (!early_pci_allowed()) |
89 | return -1; | |
90 | ||
3aa88cdf CM |
91 | nb = find_northbridge(); |
92 | if (nb < 0) | |
1da177e4 LT |
93 | return nb; |
94 | ||
3aa88cdf | 95 | printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb); |
1da177e4 | 96 | |
3aa88cdf | 97 | reg = read_pci_config(0, nb, 0, 0x60); |
1da177e4 | 98 | numnodes = ((reg >> 4) & 0xF) + 1; |
3bea9c97 AK |
99 | if (numnodes <= 1) |
100 | return -1; | |
1da177e4 LT |
101 | |
102 | printk(KERN_INFO "Number of nodes %d\n", numnodes); | |
103 | ||
3aa88cdf | 104 | memset(&nodes, 0, sizeof(nodes)); |
1da177e4 | 105 | prevbase = 0; |
3aa88cdf CM |
106 | for (i = 0; i < 8; i++) { |
107 | unsigned long base, limit; | |
3f098c26 | 108 | u32 nodeid; |
3aa88cdf | 109 | |
1da177e4 LT |
110 | base = read_pci_config(0, nb, 1, 0x40 + i*8); |
111 | limit = read_pci_config(0, nb, 1, 0x44 + i*8); | |
112 | ||
3aa88cdf | 113 | nodeid = limit & 7; |
3f098c26 | 114 | nodeids[i] = nodeid; |
3aa88cdf | 115 | if ((base & 3) == 0) { |
1da177e4 | 116 | if (i < numnodes) |
3aa88cdf | 117 | printk("Skipping disabled node %d\n", i); |
1da177e4 | 118 | continue; |
3aa88cdf | 119 | } |
1da177e4 LT |
120 | if (nodeid >= numnodes) { |
121 | printk("Ignoring excess node %d (%lx:%lx)\n", nodeid, | |
3aa88cdf | 122 | base, limit); |
1da177e4 | 123 | continue; |
3aa88cdf | 124 | } |
1da177e4 | 125 | |
3aa88cdf CM |
126 | if (!limit) { |
127 | printk(KERN_INFO "Skipping node entry %d (base %lx)\n", | |
128 | i, base); | |
1da177e4 LT |
129 | continue; |
130 | } | |
131 | if ((base >> 8) & 3 || (limit >> 8) & 3) { | |
3aa88cdf CM |
132 | printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n", |
133 | nodeid, (base>>8)&3, (limit>>8) & 3); | |
134 | return -1; | |
135 | } | |
e3f1caee | 136 | if (node_isset(nodeid, node_possible_map)) { |
3aa88cdf | 137 | printk(KERN_INFO "Node %d already present. Skipping\n", |
1da177e4 LT |
138 | nodeid); |
139 | continue; | |
140 | } | |
141 | ||
3aa88cdf CM |
142 | limit >>= 16; |
143 | limit <<= 24; | |
1da177e4 | 144 | limit |= (1<<24)-1; |
ffd10a2b | 145 | limit++; |
1da177e4 LT |
146 | |
147 | if (limit > end_pfn << PAGE_SHIFT) | |
148 | limit = end_pfn << PAGE_SHIFT; | |
149 | if (limit <= base) | |
3aa88cdf CM |
150 | continue; |
151 | ||
1da177e4 | 152 | base >>= 16; |
3aa88cdf CM |
153 | base <<= 24; |
154 | ||
155 | if (base < start) | |
156 | base = start; | |
157 | if (limit > end) | |
158 | limit = end; | |
159 | if (limit == base) { | |
160 | printk(KERN_ERR "Empty node %d\n", nodeid); | |
161 | continue; | |
1da177e4 | 162 | } |
3aa88cdf | 163 | if (limit < base) { |
1da177e4 | 164 | printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n", |
3aa88cdf | 165 | nodeid, base, limit); |
1da177e4 | 166 | continue; |
3aa88cdf CM |
167 | } |
168 | ||
1da177e4 | 169 | /* Could sort here, but pun for now. Should not happen anyroads. */ |
3aa88cdf | 170 | if (prevbase > base) { |
1da177e4 | 171 | printk(KERN_ERR "Node map not sorted %lx,%lx\n", |
3aa88cdf | 172 | prevbase, base); |
1da177e4 LT |
173 | return -1; |
174 | } | |
3aa88cdf CM |
175 | |
176 | printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n", | |
177 | nodeid, base, limit); | |
178 | ||
1da177e4 | 179 | found++; |
3aa88cdf CM |
180 | |
181 | nodes[nodeid].start = base; | |
1da177e4 | 182 | nodes[nodeid].end = limit; |
5cb248ab MG |
183 | e820_register_active_regions(nodeid, |
184 | nodes[nodeid].start >> PAGE_SHIFT, | |
185 | nodes[nodeid].end >> PAGE_SHIFT); | |
1da177e4 LT |
186 | |
187 | prevbase = base; | |
188 | ||
e3f1caee | 189 | node_set(nodeid, node_possible_map); |
3aa88cdf | 190 | } |
1da177e4 LT |
191 | |
192 | if (!found) | |
3aa88cdf | 193 | return -1; |
1da177e4 | 194 | |
6ec6e0d9 | 195 | memnode_shift = compute_hash_shift(nodes, 8, NULL); |
3aa88cdf CM |
196 | if (memnode_shift < 0) { |
197 | printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n"); | |
198 | return -1; | |
199 | } | |
200 | printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift); | |
1da177e4 | 201 | |
3f6e5a12 YL |
202 | /* use the coreid bits from early_identify_cpu */ |
203 | bits = boot_cpu_data.x86_coreid_bits; | |
204 | cores = (1<<bits); | |
cbf9bd60 YL |
205 | apicid_base = 0; |
206 | /* need to get boot_cpu_id early for system with apicid lifting */ | |
207 | early_get_boot_cpu_id(); | |
208 | if (boot_cpu_physical_apicid > 0) { | |
209 | printk(KERN_INFO "BSP APIC ID: %02x\n", | |
210 | boot_cpu_physical_apicid); | |
211 | apicid_base = boot_cpu_physical_apicid; | |
212 | } | |
3f6e5a12 | 213 | |
1da177e4 | 214 | for (i = 0; i < 8; i++) { |
3aa88cdf | 215 | if (nodes[i].start != nodes[i].end) { |
3f098c26 | 216 | nodeid = nodeids[i]; |
cbf9bd60 | 217 | for (j = apicid_base; j < cores + apicid_base; j++) |
3f6e5a12 | 218 | apicid_to_node[(nodeid << bits) + j] = i; |
3aa88cdf CM |
219 | setup_node_bootmem(i, nodes[i].start, nodes[i].end); |
220 | } | |
1da177e4 LT |
221 | } |
222 | ||
223 | numa_init_array(); | |
224 | return 0; | |
3aa88cdf | 225 | } |