1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_NUMA_H
3 #define _LINUX_NUMA_H
4 #include <linux/init.h>
5 #include <linux/types.h>
6
7 #ifdef CONFIG_NODES_SHIFT
8 #define NODES_SHIFT CONFIG_NODES_SHIFT
9 #else
10 #define NODES_SHIFT 0
11 #endif
12
13 #define MAX_NUMNODES (1 << NODES_SHIFT)
14
15 #define NUMA_NO_NODE (-1)
16 #define NUMA_NO_MEMBLK (-1)
17
18 static inline bool numa_valid_node(int nid)
19 {
20 return nid >= 0 && nid < MAX_NUMNODES;
21 }
22
23 /* optionally keep NUMA memory info available post init */
24 #ifdef CONFIG_NUMA_KEEP_MEMINFO
25 #define __initdata_or_meminfo
26 #else
27 #define __initdata_or_meminfo __initdata
28 #endif
29
30 #ifdef CONFIG_NUMA
31 #include <asm/sparsemem.h>
32
33 /* Generic implementation available */
34 int numa_nearest_node(int node, unsigned int state);
35
36 #ifndef memory_add_physaddr_to_nid
37 int memory_add_physaddr_to_nid(u64 start);
38 #endif
39
40 #ifndef phys_to_target_node
41 int phys_to_target_node(u64 start);
42 #endif
43
44 int numa_fill_memblks(u64 start, u64 end);
45
46 #else /* !CONFIG_NUMA */
47 static inline int numa_nearest_node(int node, unsigned int state)
48 {
49 return NUMA_NO_NODE;
50 }
51
52 static inline int memory_add_physaddr_to_nid(u64 start)
53 {
54 return 0;
55 }
56 static inline int phys_to_target_node(u64 start)
57 {
58 return 0;
59 }
60 #endif
61
62 #define numa_map_to_online_node(node) numa_nearest_node(node, N_ONLINE)
63
64 #ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
65 extern const struct attribute_group arch_node_dev_group;
66 #endif
67
68 #endif /* _LINUX_NUMA_H */
69
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