1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_NUMA_H
3 #define _LINUX_NUMA_H
4 #include <linux/types.h>
5
6 #ifdef CONFIG_NODES_SHIFT
7 #define NODES_SHIFT CONFIG_NODES_SHIFT
8 #else
9 #define NODES_SHIFT 0
10 #endif
11
12 #define MAX_NUMNODES (1 << NODES_SHIFT)
13
14 #define NUMA_NO_NODE (-1)
15 #define NUMA_NO_MEMBLK (-1)
16
17 /* optionally keep NUMA memory info available post init */
18 #ifdef CONFIG_NUMA_KEEP_MEMINFO
19 #define __initdata_or_meminfo
20 #else
21 #define __initdata_or_meminfo __initdata
22 #endif
23
24 #ifdef CONFIG_NUMA
25 #include <linux/printk.h>
26 #include <asm/sparsemem.h>
27
28 /* Generic implementation available */
29 int numa_nearest_node(int node, unsigned int state);
30
31 #ifndef memory_add_physaddr_to_nid
memory_add_physaddr_to_nid(u64 start)32 static inline int memory_add_physaddr_to_nid(u64 start)
33 {
34 pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n",
35 start);
36 return 0;
37 }
38 #endif
39 #ifndef phys_to_target_node
phys_to_target_node(u64 start)40 static inline int phys_to_target_node(u64 start)
41 {
42 pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
43 start);
44 return 0;
45 }
46 #endif
47 #ifndef numa_fill_memblks
numa_fill_memblks(u64 start,u64 end)48 static inline int __init numa_fill_memblks(u64 start, u64 end)
49 {
50 return NUMA_NO_MEMBLK;
51 }
52 #endif
53 #else /* !CONFIG_NUMA */
numa_nearest_node(int node,unsigned int state)54 static inline int numa_nearest_node(int node, unsigned int state)
55 {
56 return NUMA_NO_NODE;
57 }
58
memory_add_physaddr_to_nid(u64 start)59 static inline int memory_add_physaddr_to_nid(u64 start)
60 {
61 return 0;
62 }
phys_to_target_node(u64 start)63 static inline int phys_to_target_node(u64 start)
64 {
65 return 0;
66 }
67 #endif
68
69 #define numa_map_to_online_node(node) numa_nearest_node(node, N_ONLINE)
70
71 #ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
72 extern const struct attribute_group arch_node_dev_group;
73 #endif
74
75 #endif /* _LINUX_NUMA_H */
76