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Mel Gorman6b74ab92008-07-23 21:26:49 -07001/*
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>
Nishanth Aravamudanff7ea792008-07-23 21:27:39 -070010#include <linux/kobject.h>
11#include <linux/module.h>
Mel Gorman708614e2008-07-23 21:26:51 -070012#include "internal.h"
Mel Gorman6b74ab92008-07-23 21:26:49 -070013
Nishanth Aravamudan5e9426ab2008-07-23 21:27:39 -070014#ifdef CONFIG_DEBUG_MEMORY_INIT
Mel Gorman6b74ab92008-07-23 21:26:49 -070015int __meminitdata mminit_loglevel;
16
Mel Gorman68ad8df2008-07-23 21:26:52 -070017/* The zonelists are simply reported, validation is manual. */
18void mminit_verify_zonelist(void)
19{
20 int nid;
21
22 if (mminit_loglevel < MMINIT_VERIFY)
23 return;
24
25 for_each_online_node(nid) {
26 pg_data_t *pgdat = NODE_DATA(nid);
27 struct zone *zone;
28 struct zoneref *z;
29 struct zonelist *zonelist;
30 int i, listid, zoneid;
31
32 BUG_ON(MAX_ZONELISTS > 2);
33 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
34
35 /* Identify the zone and nodelist */
36 zoneid = i % MAX_NR_ZONES;
37 listid = i / MAX_NR_ZONES;
38 zonelist = &pgdat->node_zonelists[listid];
39 zone = &pgdat->node_zones[zoneid];
40 if (!populated_zone(zone))
41 continue;
42
43 /* Print information about the zonelist */
44 printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
45 listid > 0 ? "thisnode" : "general", nid,
46 zone->name);
47
48 /* Iterate the zonelist */
49 for_each_zone_zonelist(zone, z, zonelist, zoneid) {
50#ifdef CONFIG_NUMA
51 printk(KERN_CONT "%d:%s ",
52 zone->node, zone->name);
53#else
54 printk(KERN_CONT "0:%s ", zone->name);
55#endif /* CONFIG_NUMA */
56 }
57 printk(KERN_CONT "\n");
58 }
59 }
60}
61
Mel Gorman708614e2008-07-23 21:26:51 -070062void __init mminit_verify_pageflags_layout(void)
63{
64 int shift, width;
65 unsigned long or_mask, add_mask;
66
67 shift = 8 * sizeof(unsigned long);
68 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
69 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
70 "Section %d Node %d Zone %d Flags %d\n",
71 SECTIONS_WIDTH,
72 NODES_WIDTH,
73 ZONES_WIDTH,
74 NR_PAGEFLAGS);
75 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
76 "Section %d Node %d Zone %d\n",
77#ifdef SECTIONS_SHIFT
78 SECTIONS_SHIFT,
79#else
80 0,
81#endif
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
124void __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
Mel Gorman6b74ab92008-07-23 21:26:49 -0700132static __init int set_mminit_loglevel(char *str)
133{
134 get_option(&str, &mminit_loglevel);
135 return 0;
136}
137early_param("mminit_loglevel", set_mminit_loglevel);
Nishanth Aravamudan5e9426ab2008-07-23 21:27:39 -0700138#endif /* CONFIG_DEBUG_MEMORY_INIT */
Nishanth Aravamudanff7ea792008-07-23 21:27:39 -0700139
140struct kobject *mm_kobj;
141EXPORT_SYMBOL_GPL(mm_kobj);
142
143static 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);