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 #include <linux/swap.h> 17 18 static struct sysdev_class node_class = { 19 .name = "node", 20 }; 21 22 23 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) 24 { 25 struct node *node_dev = to_node(dev); 26 node_to_cpumask_ptr(mask, node_dev->sysdev.id); 27 int len; 28 29 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ 30 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); 31 32 len = type? 33 cpulist_scnprintf(buf, PAGE_SIZE-2, *mask): 34 cpumask_scnprintf(buf, PAGE_SIZE-2, *mask); 35 buf[len++] = '\n'; 36 buf[len] = '\0'; 37 return len; 38 } 39 40 static inline ssize_t node_read_cpumask(struct sys_device *dev, 41 struct sysdev_attribute *attr, char *buf) 42 { 43 return node_read_cpumap(dev, 0, buf); 44 } 45 static inline ssize_t node_read_cpulist(struct sys_device *dev, 46 struct sysdev_attribute *attr, char *buf) 47 { 48 return node_read_cpumap(dev, 1, buf); 49 } 50 51 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 52 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 53 54 #define K(x) ((x) << (PAGE_SHIFT - 10)) 55 static ssize_t node_read_meminfo(struct sys_device * dev, 56 struct sysdev_attribute *attr, char * buf) 57 { 58 int n; 59 int nid = dev->id; 60 struct sysinfo i; 61 62 si_meminfo_node(&i, nid); 63 64 n = sprintf(buf, "\n" 65 "Node %d MemTotal: %8lu kB\n" 66 "Node %d MemFree: %8lu kB\n" 67 "Node %d MemUsed: %8lu kB\n" 68 "Node %d Active: %8lu kB\n" 69 "Node %d Inactive: %8lu kB\n" 70 "Node %d Active(anon): %8lu kB\n" 71 "Node %d Inactive(anon): %8lu kB\n" 72 "Node %d Active(file): %8lu kB\n" 73 "Node %d Inactive(file): %8lu kB\n" 74 #ifdef CONFIG_UNEVICTABLE_LRU 75 "Node %d Unevictable: %8lu kB\n" 76 "Node %d Mlocked: %8lu kB\n" 77 #endif 78 #ifdef CONFIG_HIGHMEM 79 "Node %d HighTotal: %8lu kB\n" 80 "Node %d HighFree: %8lu kB\n" 81 "Node %d LowTotal: %8lu kB\n" 82 "Node %d LowFree: %8lu kB\n" 83 #endif 84 "Node %d Dirty: %8lu kB\n" 85 "Node %d Writeback: %8lu kB\n" 86 "Node %d FilePages: %8lu kB\n" 87 "Node %d Mapped: %8lu kB\n" 88 "Node %d AnonPages: %8lu kB\n" 89 "Node %d PageTables: %8lu kB\n" 90 "Node %d NFS_Unstable: %8lu kB\n" 91 "Node %d Bounce: %8lu kB\n" 92 "Node %d WritebackTmp: %8lu kB\n" 93 "Node %d Slab: %8lu kB\n" 94 "Node %d SReclaimable: %8lu kB\n" 95 "Node %d SUnreclaim: %8lu kB\n", 96 nid, K(i.totalram), 97 nid, K(i.freeram), 98 nid, K(i.totalram - i.freeram), 99 nid, K(node_page_state(nid, NR_ACTIVE_ANON) + 100 node_page_state(nid, NR_ACTIVE_FILE)), 101 nid, K(node_page_state(nid, NR_INACTIVE_ANON) + 102 node_page_state(nid, NR_INACTIVE_FILE)), 103 nid, K(node_page_state(nid, NR_ACTIVE_ANON)), 104 nid, K(node_page_state(nid, NR_INACTIVE_ANON)), 105 nid, K(node_page_state(nid, NR_ACTIVE_FILE)), 106 nid, K(node_page_state(nid, NR_INACTIVE_FILE)), 107 #ifdef CONFIG_UNEVICTABLE_LRU 108 nid, K(node_page_state(nid, NR_UNEVICTABLE)), 109 nid, K(node_page_state(nid, NR_MLOCK)), 110 #endif 111 #ifdef CONFIG_HIGHMEM 112 nid, K(i.totalhigh), 113 nid, K(i.freehigh), 114 nid, K(i.totalram - i.totalhigh), 115 nid, K(i.freeram - i.freehigh), 116 #endif 117 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 118 nid, K(node_page_state(nid, NR_WRITEBACK)), 119 nid, K(node_page_state(nid, NR_FILE_PAGES)), 120 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 121 nid, K(node_page_state(nid, NR_ANON_PAGES)), 122 nid, K(node_page_state(nid, NR_PAGETABLE)), 123 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 124 nid, K(node_page_state(nid, NR_BOUNCE)), 125 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), 126 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 127 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 128 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 129 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 130 n += hugetlb_report_node_meminfo(nid, buf + n); 131 return n; 132 } 133 134 #undef K 135 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 136 137 static ssize_t node_read_numastat(struct sys_device * dev, 138 struct sysdev_attribute *attr, char * buf) 139 { 140 return sprintf(buf, 141 "numa_hit %lu\n" 142 "numa_miss %lu\n" 143 "numa_foreign %lu\n" 144 "interleave_hit %lu\n" 145 "local_node %lu\n" 146 "other_node %lu\n", 147 node_page_state(dev->id, NUMA_HIT), 148 node_page_state(dev->id, NUMA_MISS), 149 node_page_state(dev->id, NUMA_FOREIGN), 150 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 151 node_page_state(dev->id, NUMA_LOCAL), 152 node_page_state(dev->id, NUMA_OTHER)); 153 } 154 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 155 156 static ssize_t node_read_distance(struct sys_device * dev, 157 struct sysdev_attribute *attr, char * buf) 158 { 159 int nid = dev->id; 160 int len = 0; 161 int i; 162 163 /* buf currently PAGE_SIZE, need ~4 chars per node */ 164 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); 165 166 for_each_online_node(i) 167 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 168 169 len += sprintf(buf + len, "\n"); 170 return len; 171 } 172 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 173 174 175 /* 176 * register_node - Setup a sysfs device for a node. 177 * @num - Node number to use when creating the device. 178 * 179 * Initialize and register the node device. 180 */ 181 int register_node(struct node *node, int num, struct node *parent) 182 { 183 int error; 184 185 node->sysdev.id = num; 186 node->sysdev.cls = &node_class; 187 error = sysdev_register(&node->sysdev); 188 189 if (!error){ 190 sysdev_create_file(&node->sysdev, &attr_cpumap); 191 sysdev_create_file(&node->sysdev, &attr_cpulist); 192 sysdev_create_file(&node->sysdev, &attr_meminfo); 193 sysdev_create_file(&node->sysdev, &attr_numastat); 194 sysdev_create_file(&node->sysdev, &attr_distance); 195 196 scan_unevictable_register_node(node); 197 } 198 return error; 199 } 200 201 /** 202 * unregister_node - unregister a node device 203 * @node: node going away 204 * 205 * Unregisters a node device @node. All the devices on the node must be 206 * unregistered before calling this function. 207 */ 208 void unregister_node(struct node *node) 209 { 210 sysdev_remove_file(&node->sysdev, &attr_cpumap); 211 sysdev_remove_file(&node->sysdev, &attr_cpulist); 212 sysdev_remove_file(&node->sysdev, &attr_meminfo); 213 sysdev_remove_file(&node->sysdev, &attr_numastat); 214 sysdev_remove_file(&node->sysdev, &attr_distance); 215 216 scan_unevictable_unregister_node(node); 217 218 sysdev_unregister(&node->sysdev); 219 } 220 221 struct node node_devices[MAX_NUMNODES]; 222 223 /* 224 * register cpu under node 225 */ 226 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 227 { 228 if (node_online(nid)) { 229 struct sys_device *obj = get_cpu_sysdev(cpu); 230 if (!obj) 231 return 0; 232 return sysfs_create_link(&node_devices[nid].sysdev.kobj, 233 &obj->kobj, 234 kobject_name(&obj->kobj)); 235 } 236 237 return 0; 238 } 239 240 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 241 { 242 if (node_online(nid)) { 243 struct sys_device *obj = get_cpu_sysdev(cpu); 244 if (obj) 245 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 246 kobject_name(&obj->kobj)); 247 } 248 return 0; 249 } 250 251 int register_one_node(int nid) 252 { 253 int error = 0; 254 int cpu; 255 256 if (node_online(nid)) { 257 int p_node = parent_node(nid); 258 struct node *parent = NULL; 259 260 if (p_node != nid) 261 parent = &node_devices[p_node]; 262 263 error = register_node(&node_devices[nid], nid, parent); 264 265 /* link cpu under this node */ 266 for_each_present_cpu(cpu) { 267 if (cpu_to_node(cpu) == nid) 268 register_cpu_under_node(cpu, nid); 269 } 270 } 271 272 return error; 273 274 } 275 276 void unregister_one_node(int nid) 277 { 278 unregister_node(&node_devices[nid]); 279 } 280 281 /* 282 * node states attributes 283 */ 284 285 static ssize_t print_nodes_state(enum node_states state, char *buf) 286 { 287 int n; 288 289 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); 290 if (n > 0 && PAGE_SIZE > n + 1) { 291 *(buf + n++) = '\n'; 292 *(buf + n++) = '\0'; 293 } 294 return n; 295 } 296 297 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf) 298 { 299 return print_nodes_state(N_POSSIBLE, buf); 300 } 301 302 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf) 303 { 304 return print_nodes_state(N_ONLINE, buf); 305 } 306 307 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class, 308 char *buf) 309 { 310 return print_nodes_state(N_NORMAL_MEMORY, buf); 311 } 312 313 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf) 314 { 315 return print_nodes_state(N_CPU, buf); 316 } 317 318 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL); 319 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL); 320 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory, 321 NULL); 322 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL); 323 324 #ifdef CONFIG_HIGHMEM 325 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class, 326 char *buf) 327 { 328 return print_nodes_state(N_HIGH_MEMORY, buf); 329 } 330 331 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory, 332 NULL); 333 #endif 334 335 struct sysdev_class_attribute *node_state_attr[] = { 336 &attr_possible, 337 &attr_online, 338 &attr_has_normal_memory, 339 #ifdef CONFIG_HIGHMEM 340 &attr_has_high_memory, 341 #endif 342 &attr_has_cpu, 343 }; 344 345 static int node_states_init(void) 346 { 347 int i; 348 int err = 0; 349 350 for (i = 0; i < NR_NODE_STATES; i++) { 351 int ret; 352 ret = sysdev_class_create_file(&node_class, node_state_attr[i]); 353 if (!err) 354 err = ret; 355 } 356 return err; 357 } 358 359 static int __init register_node_type(void) 360 { 361 int ret; 362 363 ret = sysdev_class_register(&node_class); 364 if (!ret) 365 ret = node_states_init(); 366 367 /* 368 * Note: we're not going to unregister the node class if we fail 369 * to register the node state class attribute files. 370 */ 371 return ret; 372 } 373 postcore_initcall(register_node_type); 374