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 #include <linux/device.h> 16 17 static struct sysdev_class node_class = { 18 .name = "node", 19 }; 20 21 22 static ssize_t node_read_cpumap(struct sys_device * dev, char * buf) 23 { 24 struct node *node_dev = to_node(dev); 25 cpumask_t mask = node_to_cpumask(node_dev->sysdev.id); 26 int len; 27 28 /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */ 29 BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2); 30 31 len = cpumask_scnprintf(buf, PAGE_SIZE-1, mask); 32 len += sprintf(buf + len, "\n"); 33 return len; 34 } 35 36 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL); 37 38 #define K(x) ((x) << (PAGE_SHIFT - 10)) 39 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf) 40 { 41 int n; 42 int nid = dev->id; 43 struct sysinfo i; 44 45 si_meminfo_node(&i, nid); 46 47 n = sprintf(buf, "\n" 48 "Node %d MemTotal: %8lu kB\n" 49 "Node %d MemFree: %8lu kB\n" 50 "Node %d MemUsed: %8lu kB\n" 51 "Node %d Active: %8lu kB\n" 52 "Node %d Inactive: %8lu kB\n" 53 #ifdef CONFIG_HIGHMEM 54 "Node %d HighTotal: %8lu kB\n" 55 "Node %d HighFree: %8lu kB\n" 56 "Node %d LowTotal: %8lu kB\n" 57 "Node %d LowFree: %8lu kB\n" 58 #endif 59 "Node %d Dirty: %8lu kB\n" 60 "Node %d Writeback: %8lu kB\n" 61 "Node %d FilePages: %8lu kB\n" 62 "Node %d Mapped: %8lu kB\n" 63 "Node %d AnonPages: %8lu kB\n" 64 "Node %d PageTables: %8lu kB\n" 65 "Node %d NFS_Unstable: %8lu kB\n" 66 "Node %d Bounce: %8lu kB\n" 67 "Node %d Slab: %8lu kB\n" 68 "Node %d SReclaimable: %8lu kB\n" 69 "Node %d SUnreclaim: %8lu kB\n", 70 nid, K(i.totalram), 71 nid, K(i.freeram), 72 nid, K(i.totalram - i.freeram), 73 nid, node_page_state(nid, NR_ACTIVE), 74 nid, node_page_state(nid, NR_INACTIVE), 75 #ifdef CONFIG_HIGHMEM 76 nid, K(i.totalhigh), 77 nid, K(i.freehigh), 78 nid, K(i.totalram - i.totalhigh), 79 nid, K(i.freeram - i.freehigh), 80 #endif 81 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 82 nid, K(node_page_state(nid, NR_WRITEBACK)), 83 nid, K(node_page_state(nid, NR_FILE_PAGES)), 84 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 85 nid, K(node_page_state(nid, NR_ANON_PAGES)), 86 nid, K(node_page_state(nid, NR_PAGETABLE)), 87 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 88 nid, K(node_page_state(nid, NR_BOUNCE)), 89 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 90 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 91 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 92 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 93 n += hugetlb_report_node_meminfo(nid, buf + n); 94 return n; 95 } 96 97 #undef K 98 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 99 100 static ssize_t node_read_numastat(struct sys_device * dev, char * buf) 101 { 102 return sprintf(buf, 103 "numa_hit %lu\n" 104 "numa_miss %lu\n" 105 "numa_foreign %lu\n" 106 "interleave_hit %lu\n" 107 "local_node %lu\n" 108 "other_node %lu\n", 109 node_page_state(dev->id, NUMA_HIT), 110 node_page_state(dev->id, NUMA_MISS), 111 node_page_state(dev->id, NUMA_FOREIGN), 112 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 113 node_page_state(dev->id, NUMA_LOCAL), 114 node_page_state(dev->id, NUMA_OTHER)); 115 } 116 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 117 118 static ssize_t node_read_distance(struct sys_device * dev, char * buf) 119 { 120 int nid = dev->id; 121 int len = 0; 122 int i; 123 124 /* buf currently PAGE_SIZE, need ~4 chars per node */ 125 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); 126 127 for_each_online_node(i) 128 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 129 130 len += sprintf(buf + len, "\n"); 131 return len; 132 } 133 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 134 135 136 /* 137 * register_node - Setup a sysfs device for a node. 138 * @num - Node number to use when creating the device. 139 * 140 * Initialize and register the node device. 141 */ 142 int register_node(struct node *node, int num, struct node *parent) 143 { 144 int error; 145 146 node->sysdev.id = num; 147 node->sysdev.cls = &node_class; 148 error = sysdev_register(&node->sysdev); 149 150 if (!error){ 151 sysdev_create_file(&node->sysdev, &attr_cpumap); 152 sysdev_create_file(&node->sysdev, &attr_meminfo); 153 sysdev_create_file(&node->sysdev, &attr_numastat); 154 sysdev_create_file(&node->sysdev, &attr_distance); 155 } 156 return error; 157 } 158 159 /** 160 * unregister_node - unregister a node device 161 * @node: node going away 162 * 163 * Unregisters a node device @node. All the devices on the node must be 164 * unregistered before calling this function. 165 */ 166 void unregister_node(struct node *node) 167 { 168 sysdev_remove_file(&node->sysdev, &attr_cpumap); 169 sysdev_remove_file(&node->sysdev, &attr_meminfo); 170 sysdev_remove_file(&node->sysdev, &attr_numastat); 171 sysdev_remove_file(&node->sysdev, &attr_distance); 172 173 sysdev_unregister(&node->sysdev); 174 } 175 176 struct node node_devices[MAX_NUMNODES]; 177 178 /* 179 * register cpu under node 180 */ 181 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 182 { 183 if (node_online(nid)) { 184 struct sys_device *obj = get_cpu_sysdev(cpu); 185 if (!obj) 186 return 0; 187 return sysfs_create_link(&node_devices[nid].sysdev.kobj, 188 &obj->kobj, 189 kobject_name(&obj->kobj)); 190 } 191 192 return 0; 193 } 194 195 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 196 { 197 if (node_online(nid)) { 198 struct sys_device *obj = get_cpu_sysdev(cpu); 199 if (obj) 200 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 201 kobject_name(&obj->kobj)); 202 } 203 return 0; 204 } 205 206 int register_one_node(int nid) 207 { 208 int error = 0; 209 int cpu; 210 211 if (node_online(nid)) { 212 int p_node = parent_node(nid); 213 struct node *parent = NULL; 214 215 if (p_node != nid) 216 parent = &node_devices[p_node]; 217 218 error = register_node(&node_devices[nid], nid, parent); 219 220 /* link cpu under this node */ 221 for_each_present_cpu(cpu) { 222 if (cpu_to_node(cpu) == nid) 223 register_cpu_under_node(cpu, nid); 224 } 225 } 226 227 return error; 228 229 } 230 231 void unregister_one_node(int nid) 232 { 233 unregister_node(&node_devices[nid]); 234 } 235 236 /* 237 * node states attributes 238 */ 239 240 static ssize_t print_nodes_state(enum node_states state, char *buf) 241 { 242 int n; 243 244 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); 245 if (n > 0 && PAGE_SIZE > n + 1) { 246 *(buf + n++) = '\n'; 247 *(buf + n++) = '\0'; 248 } 249 return n; 250 } 251 252 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf) 253 { 254 return print_nodes_state(N_POSSIBLE, buf); 255 } 256 257 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf) 258 { 259 return print_nodes_state(N_ONLINE, buf); 260 } 261 262 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class, 263 char *buf) 264 { 265 return print_nodes_state(N_NORMAL_MEMORY, buf); 266 } 267 268 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf) 269 { 270 return print_nodes_state(N_CPU, buf); 271 } 272 273 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL); 274 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL); 275 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory, 276 NULL); 277 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL); 278 279 #ifdef CONFIG_HIGHMEM 280 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class, 281 char *buf) 282 { 283 return print_nodes_state(N_HIGH_MEMORY, buf); 284 } 285 286 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory, 287 NULL); 288 #endif 289 290 struct sysdev_class_attribute *node_state_attr[] = { 291 &attr_possible, 292 &attr_online, 293 &attr_has_normal_memory, 294 #ifdef CONFIG_HIGHMEM 295 &attr_has_high_memory, 296 #endif 297 &attr_has_cpu, 298 }; 299 300 static int node_states_init(void) 301 { 302 int i; 303 int err = 0; 304 305 for (i = 0; i < NR_NODE_STATES; i++) { 306 int ret; 307 ret = sysdev_class_create_file(&node_class, node_state_attr[i]); 308 if (!err) 309 err = ret; 310 } 311 return err; 312 } 313 314 static int __init register_node_type(void) 315 { 316 int ret; 317 318 ret = sysdev_class_register(&node_class); 319 if (!ret) 320 ret = node_states_init(); 321 322 /* 323 * Note: we're not going to unregister the node class if we fail 324 * to register the node state class attribute files. 325 */ 326 return ret; 327 } 328 postcore_initcall(register_node_type); 329