1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
* AMD K8 NUMA support.
* Discover the memory map and associated nodes.
*
* This version reads it directly from the K8 northbridge.
*
* Copyright 2002,2003 Andi Kleen, SuSE Labs.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/nodemask.h>
#include <asm/io.h>
#include <linux/pci_ids.h>
#include <linux/acpi.h>
#include <asm/types.h>
#include <asm/mmzone.h>
#include <asm/proto.h>
#include <asm/e820.h>
#include <asm/pci-direct.h>
#include <asm/numa.h>
#include <asm/mpspec.h>
#include <asm/apic.h>
#include <asm/k8.h>
static __init int find_northbridge(void)
{
int num;
for (num = 0; num < 32; num++) {
u32 header;
header = read_pci_config(0, num, 0, 0x00);
if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)) &&
header != (PCI_VENDOR_ID_AMD | (0x1200<<16)) &&
header != (PCI_VENDOR_ID_AMD | (0x1300<<16)))
continue;
header = read_pci_config(0, num, 1, 0x00);
if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)) &&
header != (PCI_VENDOR_ID_AMD | (0x1201<<16)) &&
header != (PCI_VENDOR_ID_AMD | (0x1301<<16)))
continue;
return num;
}
return -1;
}
static __init void early_get_boot_cpu_id(void)
{
/*
* need to get boot_cpu_id so can use that to create apicid_to_node
* in k8_scan_nodes()
*/
/*
* Find possible boot-time SMP configuration:
*/
#ifdef CONFIG_X86_MPPARSE
early_find_smp_config();
#endif
#ifdef CONFIG_ACPI
/*
* Read APIC information from ACPI tables.
*/
early_acpi_boot_init();
#endif
#ifdef CONFIG_X86_MPPARSE
/*
* get boot-time SMP configuration:
*/
if (smp_found_config)
early_get_smp_config();
#endif
early_init_lapic_mapping();
}
int __init k8_scan_nodes(unsigned long start, unsigned long end)
{
unsigned numnodes, cores, bits, apicid_base;
unsigned long prevbase;
struct bootnode nodes[8];
int i, j, nb, found = 0;
u32 nodeid, reg;
if (!early_pci_allowed())
return -1;
nb = find_northbridge();
if (nb < 0)
return nb;
pr_info("Scanning NUMA topology in Northbridge %d\n", nb);
reg = read_pci_config(0, nb, 0, 0x60);
numnodes = ((reg >> 4) & 0xF) + 1;
if (numnodes <= 1)
return -1;
pr_info("Number of nodes %d\n", numnodes);
memset(&nodes, 0, sizeof(nodes));
prevbase = 0;
for (i = 0; i < 8; i++) {
unsigned long base, limit;
base = read_pci_config(0, nb, 1, 0x40 + i*8);
limit = read_pci_config(0, nb, 1, 0x44 + i*8);
nodeid = limit & 7;
if ((base & 3) == 0) {
if (i < numnodes)
pr_info("Skipping disabled node %d\n", i);
continue;
}
if (nodeid >= numnodes) {
pr_info("Ignoring excess node %d (%lx:%lx)\n", nodeid,
base, limit);
continue;
}
if (!limit) {
pr_info("Skipping node entry %d (base %lx)\n",
i, base);
continue;
}
if ((base >> 8) & 3 || (limit >> 8) & 3) {
pr_err("Node %d using interleaving mode %lx/%lx\n",
nodeid, (base >> 8) & 3, (limit >> 8) & 3);
return -1;
}
if (node_isset(nodeid, node_possible_map)) {
pr_info("Node %d already present, skipping\n",
nodeid);
continue;
}
limit >>= 16;
limit <<= 24;
limit |= (1<<24)-1;
limit++;
if (limit > max_pfn << PAGE_SHIFT)
limit = max_pfn << PAGE_SHIFT;
if (limit <= base)
continue;
base >>= 16;
base <<= 24;
if (base < start)
base = start;
if (limit > end)
limit = end;
if (limit == base) {
pr_err("Empty node %d\n", nodeid);
continue;
}
if (limit < base) {
pr_err("Node %d bogus settings %lx-%lx.\n",
nodeid, base, limit);
continue;
}
/* Could sort here, but pun for now. Should not happen anyroads. */
if (prevbase > base) {
pr_err("Node map not sorted %lx,%lx\n",
prevbase, base);
return -1;
}
pr_info("Node %d MemBase %016lx Limit %016lx\n",
nodeid, base, limit);
found++;
nodes[nodeid].start = base;
nodes[nodeid].end = limit;
prevbase = base;
node_set(nodeid, node_possible_map);
}
if (!found)
return -1;
memnode_shift = compute_hash_shift(nodes, 8, NULL);
if (memnode_shift < 0) {
pr_err("No NUMA node hash function found. Contact maintainer\n");
return -1;
}
pr_info("Using node hash shift of %d\n", memnode_shift);
/* use the coreid bits from early_identify_cpu */
bits = boot_cpu_data.x86_coreid_bits;
cores = (1<<bits);
apicid_base = 0;
/* need to get boot_cpu_id early for system with apicid lifting */
early_get_boot_cpu_id();
if (boot_cpu_physical_apicid > 0) {
pr_info("BSP APIC ID: %02x\n", boot_cpu_physical_apicid);
apicid_base = boot_cpu_physical_apicid;
}
for (i = 0; i < 8; i++) {
if (nodes[i].start == nodes[i].end)
continue;
e820_register_active_regions(i,
nodes[i].start >> PAGE_SHIFT,
nodes[i].end >> PAGE_SHIFT);
for (j = apicid_base; j < cores + apicid_base; j++)
apicid_to_node[(i << bits) + j] = i;
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
}
numa_init_array();
return 0;
}
|
