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6b74ab97 MG |
1 | /* |
2 | * mm_init.c - Memory initialisation verification and debugging | |
3 | * | |
4 | * Copyright 2008 IBM Corporation, 2008 | |
5 | * Author Mel Gorman <mel@csn.ul.ie> | |
6 | * | |
7 | */ | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/init.h> | |
ff7ea79c NA |
10 | #include <linux/kobject.h> |
11 | #include <linux/module.h> | |
708614e6 | 12 | #include "internal.h" |
6b74ab97 | 13 | |
5e9426ab | 14 | #ifdef CONFIG_DEBUG_MEMORY_INIT |
6b74ab97 MG |
15 | int __meminitdata mminit_loglevel; |
16 | ||
5c9ffc9c AM |
17 | #ifndef SECTIONS_SHIFT |
18 | #define SECTIONS_SHIFT 0 | |
19 | #endif | |
20 | ||
68ad8df4 MG |
21 | /* The zonelists are simply reported, validation is manual. */ |
22 | void mminit_verify_zonelist(void) | |
23 | { | |
24 | int nid; | |
25 | ||
26 | if (mminit_loglevel < MMINIT_VERIFY) | |
27 | return; | |
28 | ||
29 | for_each_online_node(nid) { | |
30 | pg_data_t *pgdat = NODE_DATA(nid); | |
31 | struct zone *zone; | |
32 | struct zoneref *z; | |
33 | struct zonelist *zonelist; | |
34 | int i, listid, zoneid; | |
35 | ||
36 | BUG_ON(MAX_ZONELISTS > 2); | |
37 | for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) { | |
38 | ||
39 | /* Identify the zone and nodelist */ | |
40 | zoneid = i % MAX_NR_ZONES; | |
41 | listid = i / MAX_NR_ZONES; | |
42 | zonelist = &pgdat->node_zonelists[listid]; | |
43 | zone = &pgdat->node_zones[zoneid]; | |
44 | if (!populated_zone(zone)) | |
45 | continue; | |
46 | ||
47 | /* Print information about the zonelist */ | |
48 | printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ", | |
49 | listid > 0 ? "thisnode" : "general", nid, | |
50 | zone->name); | |
51 | ||
52 | /* Iterate the zonelist */ | |
53 | for_each_zone_zonelist(zone, z, zonelist, zoneid) { | |
54 | #ifdef CONFIG_NUMA | |
55 | printk(KERN_CONT "%d:%s ", | |
56 | zone->node, zone->name); | |
57 | #else | |
58 | printk(KERN_CONT "0:%s ", zone->name); | |
59 | #endif /* CONFIG_NUMA */ | |
60 | } | |
61 | printk(KERN_CONT "\n"); | |
62 | } | |
63 | } | |
64 | } | |
65 | ||
708614e6 MG |
66 | void __init mminit_verify_pageflags_layout(void) |
67 | { | |
68 | int shift, width; | |
69 | unsigned long or_mask, add_mask; | |
70 | ||
71 | shift = 8 * sizeof(unsigned long); | |
72 | width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH; | |
73 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths", | |
74 | "Section %d Node %d Zone %d Flags %d\n", | |
75 | SECTIONS_WIDTH, | |
76 | NODES_WIDTH, | |
77 | ZONES_WIDTH, | |
78 | NR_PAGEFLAGS); | |
79 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts", | |
80 | "Section %d Node %d Zone %d\n", | |
708614e6 | 81 | SECTIONS_SHIFT, |
708614e6 MG |
82 | NODES_SHIFT, |
83 | ZONES_SHIFT); | |
84 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets", | |
85 | "Section %lu Node %lu Zone %lu\n", | |
86 | (unsigned long)SECTIONS_PGSHIFT, | |
87 | (unsigned long)NODES_PGSHIFT, | |
88 | (unsigned long)ZONES_PGSHIFT); | |
89 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid", | |
90 | "Zone ID: %lu -> %lu\n", | |
91 | (unsigned long)ZONEID_PGOFF, | |
92 | (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT)); | |
93 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage", | |
94 | "location: %d -> %d unused %d -> %d flags %d -> %d\n", | |
95 | shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0); | |
96 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
97 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags", | |
98 | "Node not in page flags"); | |
99 | #endif | |
100 | ||
101 | if (SECTIONS_WIDTH) { | |
102 | shift -= SECTIONS_WIDTH; | |
103 | BUG_ON(shift != SECTIONS_PGSHIFT); | |
104 | } | |
105 | if (NODES_WIDTH) { | |
106 | shift -= NODES_WIDTH; | |
107 | BUG_ON(shift != NODES_PGSHIFT); | |
108 | } | |
109 | if (ZONES_WIDTH) { | |
110 | shift -= ZONES_WIDTH; | |
111 | BUG_ON(shift != ZONES_PGSHIFT); | |
112 | } | |
113 | ||
114 | /* Check for bitmask overlaps */ | |
115 | or_mask = (ZONES_MASK << ZONES_PGSHIFT) | | |
116 | (NODES_MASK << NODES_PGSHIFT) | | |
117 | (SECTIONS_MASK << SECTIONS_PGSHIFT); | |
118 | add_mask = (ZONES_MASK << ZONES_PGSHIFT) + | |
119 | (NODES_MASK << NODES_PGSHIFT) + | |
120 | (SECTIONS_MASK << SECTIONS_PGSHIFT); | |
121 | BUG_ON(or_mask != add_mask); | |
122 | } | |
123 | ||
124 | void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone, | |
125 | unsigned long nid, unsigned long pfn) | |
126 | { | |
127 | BUG_ON(page_to_nid(page) != nid); | |
128 | BUG_ON(page_zonenum(page) != zone); | |
129 | BUG_ON(page_to_pfn(page) != pfn); | |
130 | } | |
131 | ||
6b74ab97 MG |
132 | static __init int set_mminit_loglevel(char *str) |
133 | { | |
134 | get_option(&str, &mminit_loglevel); | |
135 | return 0; | |
136 | } | |
137 | early_param("mminit_loglevel", set_mminit_loglevel); | |
5e9426ab | 138 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
ff7ea79c NA |
139 | |
140 | struct kobject *mm_kobj; | |
141 | EXPORT_SYMBOL_GPL(mm_kobj); | |
142 | ||
143 | static int __init mm_sysfs_init(void) | |
144 | { | |
145 | mm_kobj = kobject_create_and_add("mm", kernel_kobj); | |
146 | if (!mm_kobj) | |
147 | return -ENOMEM; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | __initcall(mm_sysfs_init); |