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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * This file contains NUMA specific variables and functions which can | |
7 | * be split away from DISCONTIGMEM and are used on NUMA machines with | |
8 | * contiguous memory. | |
9 | * | |
10 | * 2002/08/07 Erich Focht <efocht@ess.nec.de> | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/cpu.h> |
14 | #include <linux/kernel.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/node.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/bootmem.h> | |
8c2676a5 | 19 | #include <linux/module.h> |
1da177e4 LT |
20 | #include <asm/mmzone.h> |
21 | #include <asm/numa.h> | |
22 | ||
23 | ||
24 | /* | |
25 | * The following structures are usually initialized by ACPI or | |
26 | * similar mechanisms and describe the NUMA characteristics of the machine. | |
27 | */ | |
28 | int num_node_memblks; | |
29 | struct node_memblk_s node_memblk[NR_NODE_MEMBLKS]; | |
2c6e6db4 | 30 | struct node_cpuid_s node_cpuid[NR_CPUS] = |
31 | { [0 ... NR_CPUS-1] = { .phys_id = 0, .nid = NUMA_NO_NODE } }; | |
32 | ||
1da177e4 LT |
33 | /* |
34 | * This is a matrix with "distances" between nodes, they should be | |
35 | * proportional to the memory access latency ratios. | |
36 | */ | |
37 | u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES]; | |
38 | ||
39 | /* Identify which cnode a physical address resides on */ | |
40 | int | |
41 | paddr_to_nid(unsigned long paddr) | |
42 | { | |
43 | int i; | |
44 | ||
45 | for (i = 0; i < num_node_memblks; i++) | |
46 | if (paddr >= node_memblk[i].start_paddr && | |
47 | paddr < node_memblk[i].start_paddr + node_memblk[i].size) | |
48 | break; | |
49 | ||
50 | return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0); | |
51 | } | |
2d4b1fa2 BP |
52 | |
53 | #if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA) | |
54 | /* | |
55 | * Because of holes evaluate on section limits. | |
56 | * If the section of memory exists, then return the node where the section | |
57 | * resides. Otherwise return node 0 as the default. This is used by | |
58 | * SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where | |
59 | * the section resides. | |
60 | */ | |
f2dbcfa7 | 61 | int __meminit __early_pfn_to_nid(unsigned long pfn) |
2d4b1fa2 BP |
62 | { |
63 | int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec; | |
7c243c71 RA |
64 | /* |
65 | * NOTE: The following SMP-unsafe globals are only used early in boot | |
66 | * when the kernel is running single-threaded. | |
67 | */ | |
68 | static int __meminitdata last_ssec, last_esec; | |
69 | static int __meminitdata last_nid; | |
70 | ||
71 | if (section >= last_ssec && section < last_esec) | |
72 | return last_nid; | |
2d4b1fa2 BP |
73 | |
74 | for (i = 0; i < num_node_memblks; i++) { | |
75 | ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT; | |
76 | esec = (node_memblk[i].start_paddr + node_memblk[i].size + | |
77 | ((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT; | |
7c243c71 RA |
78 | if (section >= ssec && section < esec) { |
79 | last_ssec = ssec; | |
80 | last_esec = esec; | |
81 | last_nid = node_memblk[i].nid; | |
2d4b1fa2 | 82 | return node_memblk[i].nid; |
7c243c71 | 83 | } |
2d4b1fa2 BP |
84 | } |
85 | ||
cc2559bc | 86 | return -1; |
2d4b1fa2 | 87 | } |
8c2676a5 | 88 | |
ccce9bb8 | 89 | void numa_clear_node(int cpu) |
eee46b3d YW |
90 | { |
91 | unmap_cpu_from_node(cpu, NUMA_NO_NODE); | |
92 | } | |
93 | ||
8c2676a5 KM |
94 | #ifdef CONFIG_MEMORY_HOTPLUG |
95 | /* | |
96 | * SRAT information is stored in node_memblk[], then we can use SRAT | |
97 | * information at memory-hot-add if necessary. | |
98 | */ | |
99 | ||
100 | int memory_add_physaddr_to_nid(u64 addr) | |
101 | { | |
102 | int nid = paddr_to_nid(addr); | |
103 | if (nid < 0) | |
104 | return 0; | |
105 | return nid; | |
106 | } | |
107 | ||
108 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); | |
109 | #endif | |
2d4b1fa2 | 110 | #endif |