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> 10 #include <linux/kobject.h> 11 #include <linux/export.h> 12 #include "internal.h" 13 14 #ifdef CONFIG_DEBUG_MEMORY_INIT 15 int mminit_loglevel; 16 17 #ifndef SECTIONS_SHIFT 18 #define SECTIONS_SHIFT 0 19 #endif 20 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 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", 81 SECTIONS_SHIFT, 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 } 131 132 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); 138 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 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); 153