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
|
/*
* NUMA support for s390
*
* Implement NUMA core code.
*
* Copyright IBM Corp. 2015
*/
#define KMSG_COMPONENT "numa"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/mmzone.h>
#include <linux/cpumask.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/node.h>
#include <asm/numa.h>
#include "numa_mode.h"
pg_data_t *node_data[MAX_NUMNODES];
EXPORT_SYMBOL(node_data);
cpumask_t node_to_cpumask_map[MAX_NUMNODES];
EXPORT_SYMBOL(node_to_cpumask_map);
const struct numa_mode numa_mode_plain = {
.name = "plain",
};
static const struct numa_mode *mode = &numa_mode_plain;
int numa_pfn_to_nid(unsigned long pfn)
{
return mode->__pfn_to_nid ? mode->__pfn_to_nid(pfn) : 0;
}
void numa_update_cpu_topology(void)
{
if (mode->update_cpu_topology)
mode->update_cpu_topology();
}
int __node_distance(int a, int b)
{
return mode->distance ? mode->distance(a, b) : 0;
}
int numa_debug_enabled;
/*
* alloc_node_data() - Allocate node data
*/
static __init pg_data_t *alloc_node_data(void)
{
pg_data_t *res;
res = (pg_data_t *) memblock_alloc(sizeof(pg_data_t), 8);
if (!res)
panic("Could not allocate memory for node data!\n");
memset(res, 0, sizeof(pg_data_t));
return res;
}
/*
* numa_setup_memory() - Assign bootmem to nodes
*
* The memory is first added to memblock without any respect to nodes.
* This is fixed before remaining memblock memory is handed over to the
* buddy allocator.
* An important side effect is that large bootmem allocations might easily
* cross node boundaries, which can be needed for large allocations with
* smaller memory stripes in each node (i.e. when using NUMA emulation).
*
* Memory defines nodes:
* Therefore this routine also sets the nodes online with memory.
*/
static void __init numa_setup_memory(void)
{
unsigned long cur_base, align, end_of_dram;
int nid = 0;
end_of_dram = memblock_end_of_DRAM();
align = mode->align ? mode->align() : ULONG_MAX;
/*
* Step through all available memory and assign it to the nodes
* indicated by the mode implementation.
* All nodes which are seen here will be set online.
*/
cur_base = 0;
do {
nid = numa_pfn_to_nid(PFN_DOWN(cur_base));
node_set_online(nid);
memblock_set_node(cur_base, align, &memblock.memory, nid);
cur_base += align;
} while (cur_base < end_of_dram);
/* Allocate and fill out node_data */
for (nid = 0; nid < MAX_NUMNODES; nid++)
NODE_DATA(nid) = alloc_node_data();
for_each_online_node(nid) {
unsigned long start_pfn, end_pfn;
unsigned long t_start, t_end;
int i;
start_pfn = ULONG_MAX;
end_pfn = 0;
for_each_mem_pfn_range(i, nid, &t_start, &t_end, NULL) {
if (t_start < start_pfn)
start_pfn = t_start;
if (t_end > end_pfn)
end_pfn = t_end;
}
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
NODE_DATA(nid)->node_id = nid;
}
}
/*
* numa_setup() - Earliest initialization
*
* Assign the mode and call the mode's setup routine.
*/
void __init numa_setup(void)
{
pr_info("NUMA mode: %s\n", mode->name);
if (mode->setup)
mode->setup();
numa_setup_memory();
memblock_dump_all();
}
/*
* numa_init_early() - Initialization initcall
*
* This runs when only one CPU is online and before the first
* topology update is called for by the scheduler.
*/
static int __init numa_init_early(void)
{
/* Attach all possible CPUs to node 0 for now. */
cpumask_copy(&node_to_cpumask_map[0], cpu_possible_mask);
return 0;
}
early_initcall(numa_init_early);
/*
* numa_init_late() - Initialization initcall
*
* Register NUMA nodes.
*/
static int __init numa_init_late(void)
{
int nid;
for_each_online_node(nid)
register_one_node(nid);
return 0;
}
device_initcall(numa_init_late);
static int __init parse_debug(char *parm)
{
numa_debug_enabled = 1;
return 0;
}
early_param("numa_debug", parse_debug);
static int __init parse_numa(char *parm)
{
if (strcmp(parm, numa_mode_plain.name) == 0)
mode = &numa_mode_plain;
#ifdef CONFIG_NUMA_EMU
if (strcmp(parm, numa_mode_emu.name) == 0)
mode = &numa_mode_emu;
#endif
return 0;
}
early_param("numa", parse_numa);
|
