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