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