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