1 /* 2 * drivers/base/node.c - basic Node class support 3 */ 4 5 #include <linux/sysdev.h> 6 #include <linux/module.h> 7 #include <linux/init.h> 8 #include <linux/mm.h> 9 #include <linux/node.h> 10 #include <linux/hugetlb.h> 11 #include <linux/cpumask.h> 12 #include <linux/topology.h> 13 #include <linux/nodemask.h> 14 #include <linux/cpu.h> 15 16 static struct sysdev_class node_class = { 17 set_kset_name("node"), 18 }; 19 20 21 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf) 22 { 23 struct node *node_dev = to_node(dev); 24 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id); 25 int len; 26 27 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */ 28 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2); 29 30 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask); 31 len += sprintf(buf + len, "\n"); 32 return len; 33 } 34 35 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL); 36 37 #define K(x) ((x) << (PAGE_SHIFT - 10)) 38 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf) 39 { 40 int n; 41 int nid = dev->id; 42 struct sysinfo i; 43 unsigned long inactive; 44 unsigned long active; 45 unsigned long free; 46 47 si_meminfo_node(&i, nid); 48 __get_zone_counts(&active, &inactive, &free, NODE_DATA(nid)); 49 50 51 n = sprintf(buf, "\n" 52 "Node %d MemTotal: %8lu kB\n" 53 "Node %d MemFree: %8lu kB\n" 54 "Node %d MemUsed: %8lu kB\n" 55 "Node %d Active: %8lu kB\n" 56 "Node %d Inactive: %8lu kB\n" 57 #ifdef CONFIG_HIGHMEM 58 "Node %d HighTotal: %8lu kB\n" 59 "Node %d HighFree: %8lu kB\n" 60 "Node %d LowTotal: %8lu kB\n" 61 "Node %d LowFree: %8lu kB\n" 62 #endif 63 "Node %d Dirty: %8lu kB\n" 64 "Node %d Writeback: %8lu kB\n" 65 "Node %d FilePages: %8lu kB\n" 66 "Node %d Mapped: %8lu kB\n" 67 "Node %d AnonPages: %8lu kB\n" 68 "Node %d PageTables: %8lu kB\n" 69 "Node %d NFS_Unstable: %8lu kB\n" 70 "Node %d Bounce: %8lu kB\n" 71 "Node %d Slab: %8lu kB\n" 72 "Node %d SReclaimable: %8lu kB\n" 73 "Node %d SUnreclaim: %8lu kB\n", 74 nid, K(i.totalram), 75 nid, K(i.freeram), 76 nid, K(i.totalram - i.freeram), 77 nid, K(active), 78 nid, K(inactive), 79 #ifdef CONFIG_HIGHMEM 80 nid, K(i.totalhigh), 81 nid, K(i.freehigh), 82 nid, K(i.totalram - i.totalhigh), 83 nid, K(i.freeram - i.freehigh), 84 #endif 85 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 86 nid, K(node_page_state(nid, NR_WRITEBACK)), 87 nid, K(node_page_state(nid, NR_FILE_PAGES)), 88 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 89 nid, K(node_page_state(nid, NR_ANON_PAGES)), 90 nid, K(node_page_state(nid, NR_PAGETABLE)), 91 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 92 nid, K(node_page_state(nid, NR_BOUNCE)), 93 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 94 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 95 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 96 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 97 n += hugetlb_report_node_meminfo(nid, buf + n); 98 return n; 99 } 100 101 #undef K 102 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 103 104 static ssize_t node_read_numastat(struct sys_device * dev, char * buf) 105 { 106 return sprintf(buf, 107 "numa_hit %lu\n" 108 "numa_miss %lu\n" 109 "numa_foreign %lu\n" 110 "interleave_hit %lu\n" 111 "local_node %lu\n" 112 "other_node %lu\n", 113 node_page_state(dev->id, NUMA_HIT), 114 node_page_state(dev->id, NUMA_MISS), 115 node_page_state(dev->id, NUMA_FOREIGN), 116 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 117 node_page_state(dev->id, NUMA_LOCAL), 118 node_page_state(dev->id, NUMA_OTHER)); 119 } 120 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 121 122 static ssize_t node_read_distance(struct sys_device * dev, char * buf) 123 { 124 int nid = dev->id; 125 int len = 0; 126 int i; 127 128 /* buf currently PAGE_SIZE, need ~4 chars per node */ 129 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); 130 131 for_each_online_node(i) 132 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 133 134 len += sprintf(buf + len, "\n"); 135 return len; 136 } 137 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 138 139 140 /* 141 * register_node - Setup a driverfs device for a node. 142 * @num - Node number to use when creating the device. 143 * 144 * Initialize and register the node device. 145 */ 146 int register_node(struct node *node, int num, struct node *parent) 147 { 148 int error; 149 150 node->sysdev.id = num; 151 node->sysdev.cls = &node_class; 152 error = sysdev_register(&node->sysdev); 153 154 if (!error){ 155 sysdev_create_file(&node->sysdev, &attr_cpumap); 156 sysdev_create_file(&node->sysdev, &attr_meminfo); 157 sysdev_create_file(&node->sysdev, &attr_numastat); 158 sysdev_create_file(&node->sysdev, &attr_distance); 159 } 160 return error; 161 } 162 163 /** 164 * unregister_node - unregister a node device 165 * @node: node going away 166 * 167 * Unregisters a node device @node. All the devices on the node must be 168 * unregistered before calling this function. 169 */ 170 void unregister_node(struct node *node) 171 { 172 sysdev_remove_file(&node->sysdev, &attr_cpumap); 173 sysdev_remove_file(&node->sysdev, &attr_meminfo); 174 sysdev_remove_file(&node->sysdev, &attr_numastat); 175 sysdev_remove_file(&node->sysdev, &attr_distance); 176 177 sysdev_unregister(&node->sysdev); 178 } 179 180 struct node node_devices[MAX_NUMNODES]; 181 182 /* 183 * register cpu under node 184 */ 185 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 186 { 187 if (node_online(nid)) { 188 struct sys_device *obj = get_cpu_sysdev(cpu); 189 if (!obj) 190 return 0; 191 return sysfs_create_link(&node_devices[nid].sysdev.kobj, 192 &obj->kobj, 193 kobject_name(&obj->kobj)); 194 } 195 196 return 0; 197 } 198 199 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 200 { 201 if (node_online(nid)) { 202 struct sys_device *obj = get_cpu_sysdev(cpu); 203 if (obj) 204 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 205 kobject_name(&obj->kobj)); 206 } 207 return 0; 208 } 209 210 int register_one_node(int nid) 211 { 212 int error = 0; 213 int cpu; 214 215 if (node_online(nid)) { 216 int p_node = parent_node(nid); 217 struct node *parent = NULL; 218 219 if (p_node != nid) 220 parent = &node_devices[p_node]; 221 222 error = register_node(&node_devices[nid], nid, parent); 223 224 /* link cpu under this node */ 225 for_each_present_cpu(cpu) { 226 if (cpu_to_node(cpu) == nid) 227 register_cpu_under_node(cpu, nid); 228 } 229 } 230 231 return error; 232 233 } 234 235 void unregister_one_node(int nid) 236 { 237 unregister_node(&node_devices[nid]); 238 } 239 240 static int __init register_node_type(void) 241 { 242 return sysdev_class_register(&node_class); 243 } 244 postcore_initcall(register_node_type); 245