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/memory.h> 10 #include <linux/node.h> 11 #include <linux/hugetlb.h> 12 #include <linux/cpumask.h> 13 #include <linux/topology.h> 14 #include <linux/nodemask.h> 15 #include <linux/cpu.h> 16 #include <linux/device.h> 17 #include <linux/swap.h> 18 19 static struct sysdev_class node_class = { 20 .name = "node", 21 }; 22 23 24 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) 25 { 26 struct node *node_dev = to_node(dev); 27 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id); 28 int len; 29 30 /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ 31 BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); 32 33 len = type? 34 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : 35 cpumask_scnprintf(buf, PAGE_SIZE-2, mask); 36 buf[len++] = '\n'; 37 buf[len] = '\0'; 38 return len; 39 } 40 41 static inline ssize_t node_read_cpumask(struct sys_device *dev, 42 struct sysdev_attribute *attr, char *buf) 43 { 44 return node_read_cpumap(dev, 0, buf); 45 } 46 static inline ssize_t node_read_cpulist(struct sys_device *dev, 47 struct sysdev_attribute *attr, char *buf) 48 { 49 return node_read_cpumap(dev, 1, buf); 50 } 51 52 static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); 53 static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); 54 55 #define K(x) ((x) << (PAGE_SHIFT - 10)) 56 static ssize_t node_read_meminfo(struct sys_device * dev, 57 struct sysdev_attribute *attr, char * buf) 58 { 59 int n; 60 int nid = dev->id; 61 struct sysinfo i; 62 63 si_meminfo_node(&i, nid); 64 65 n = sprintf(buf, "\n" 66 "Node %d MemTotal: %8lu kB\n" 67 "Node %d MemFree: %8lu kB\n" 68 "Node %d MemUsed: %8lu kB\n" 69 "Node %d Active: %8lu kB\n" 70 "Node %d Inactive: %8lu kB\n" 71 "Node %d Active(anon): %8lu kB\n" 72 "Node %d Inactive(anon): %8lu kB\n" 73 "Node %d Active(file): %8lu kB\n" 74 "Node %d Inactive(file): %8lu kB\n" 75 #ifdef CONFIG_UNEVICTABLE_LRU 76 "Node %d Unevictable: %8lu kB\n" 77 "Node %d Mlocked: %8lu kB\n" 78 #endif 79 #ifdef CONFIG_HIGHMEM 80 "Node %d HighTotal: %8lu kB\n" 81 "Node %d HighFree: %8lu kB\n" 82 "Node %d LowTotal: %8lu kB\n" 83 "Node %d LowFree: %8lu kB\n" 84 #endif 85 "Node %d Dirty: %8lu kB\n" 86 "Node %d Writeback: %8lu kB\n" 87 "Node %d FilePages: %8lu kB\n" 88 "Node %d Mapped: %8lu kB\n" 89 "Node %d AnonPages: %8lu kB\n" 90 "Node %d PageTables: %8lu kB\n" 91 "Node %d NFS_Unstable: %8lu kB\n" 92 "Node %d Bounce: %8lu kB\n" 93 "Node %d WritebackTmp: %8lu kB\n" 94 "Node %d Slab: %8lu kB\n" 95 "Node %d SReclaimable: %8lu kB\n" 96 "Node %d SUnreclaim: %8lu kB\n", 97 nid, K(i.totalram), 98 nid, K(i.freeram), 99 nid, K(i.totalram - i.freeram), 100 nid, K(node_page_state(nid, NR_ACTIVE_ANON) + 101 node_page_state(nid, NR_ACTIVE_FILE)), 102 nid, K(node_page_state(nid, NR_INACTIVE_ANON) + 103 node_page_state(nid, NR_INACTIVE_FILE)), 104 nid, K(node_page_state(nid, NR_ACTIVE_ANON)), 105 nid, K(node_page_state(nid, NR_INACTIVE_ANON)), 106 nid, K(node_page_state(nid, NR_ACTIVE_FILE)), 107 nid, K(node_page_state(nid, NR_INACTIVE_FILE)), 108 #ifdef CONFIG_UNEVICTABLE_LRU 109 nid, K(node_page_state(nid, NR_UNEVICTABLE)), 110 nid, K(node_page_state(nid, NR_MLOCK)), 111 #endif 112 #ifdef CONFIG_HIGHMEM 113 nid, K(i.totalhigh), 114 nid, K(i.freehigh), 115 nid, K(i.totalram - i.totalhigh), 116 nid, K(i.freeram - i.freehigh), 117 #endif 118 nid, K(node_page_state(nid, NR_FILE_DIRTY)), 119 nid, K(node_page_state(nid, NR_WRITEBACK)), 120 nid, K(node_page_state(nid, NR_FILE_PAGES)), 121 nid, K(node_page_state(nid, NR_FILE_MAPPED)), 122 nid, K(node_page_state(nid, NR_ANON_PAGES)), 123 nid, K(node_page_state(nid, NR_PAGETABLE)), 124 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), 125 nid, K(node_page_state(nid, NR_BOUNCE)), 126 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), 127 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + 128 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), 129 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), 130 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); 131 n += hugetlb_report_node_meminfo(nid, buf + n); 132 return n; 133 } 134 135 #undef K 136 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); 137 138 static ssize_t node_read_numastat(struct sys_device * dev, 139 struct sysdev_attribute *attr, char * buf) 140 { 141 return sprintf(buf, 142 "numa_hit %lu\n" 143 "numa_miss %lu\n" 144 "numa_foreign %lu\n" 145 "interleave_hit %lu\n" 146 "local_node %lu\n" 147 "other_node %lu\n", 148 node_page_state(dev->id, NUMA_HIT), 149 node_page_state(dev->id, NUMA_MISS), 150 node_page_state(dev->id, NUMA_FOREIGN), 151 node_page_state(dev->id, NUMA_INTERLEAVE_HIT), 152 node_page_state(dev->id, NUMA_LOCAL), 153 node_page_state(dev->id, NUMA_OTHER)); 154 } 155 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); 156 157 static ssize_t node_read_distance(struct sys_device * dev, 158 struct sysdev_attribute *attr, char * buf) 159 { 160 int nid = dev->id; 161 int len = 0; 162 int i; 163 164 /* buf currently PAGE_SIZE, need ~4 chars per node */ 165 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); 166 167 for_each_online_node(i) 168 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); 169 170 len += sprintf(buf + len, "\n"); 171 return len; 172 } 173 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); 174 175 176 /* 177 * register_node - Setup a sysfs device for a node. 178 * @num - Node number to use when creating the device. 179 * 180 * Initialize and register the node device. 181 */ 182 int register_node(struct node *node, int num, struct node *parent) 183 { 184 int error; 185 186 node->sysdev.id = num; 187 node->sysdev.cls = &node_class; 188 error = sysdev_register(&node->sysdev); 189 190 if (!error){ 191 sysdev_create_file(&node->sysdev, &attr_cpumap); 192 sysdev_create_file(&node->sysdev, &attr_cpulist); 193 sysdev_create_file(&node->sysdev, &attr_meminfo); 194 sysdev_create_file(&node->sysdev, &attr_numastat); 195 sysdev_create_file(&node->sysdev, &attr_distance); 196 197 scan_unevictable_register_node(node); 198 } 199 return error; 200 } 201 202 /** 203 * unregister_node - unregister a node device 204 * @node: node going away 205 * 206 * Unregisters a node device @node. All the devices on the node must be 207 * unregistered before calling this function. 208 */ 209 void unregister_node(struct node *node) 210 { 211 sysdev_remove_file(&node->sysdev, &attr_cpumap); 212 sysdev_remove_file(&node->sysdev, &attr_cpulist); 213 sysdev_remove_file(&node->sysdev, &attr_meminfo); 214 sysdev_remove_file(&node->sysdev, &attr_numastat); 215 sysdev_remove_file(&node->sysdev, &attr_distance); 216 217 scan_unevictable_unregister_node(node); 218 219 sysdev_unregister(&node->sysdev); 220 } 221 222 struct node node_devices[MAX_NUMNODES]; 223 224 /* 225 * register cpu under node 226 */ 227 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 228 { 229 if (node_online(nid)) { 230 struct sys_device *obj = get_cpu_sysdev(cpu); 231 if (!obj) 232 return 0; 233 return sysfs_create_link(&node_devices[nid].sysdev.kobj, 234 &obj->kobj, 235 kobject_name(&obj->kobj)); 236 } 237 238 return 0; 239 } 240 241 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 242 { 243 if (node_online(nid)) { 244 struct sys_device *obj = get_cpu_sysdev(cpu); 245 if (obj) 246 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 247 kobject_name(&obj->kobj)); 248 } 249 return 0; 250 } 251 252 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 253 #define page_initialized(page) (page->lru.next) 254 255 static int get_nid_for_pfn(unsigned long pfn) 256 { 257 struct page *page; 258 259 if (!pfn_valid_within(pfn)) 260 return -1; 261 page = pfn_to_page(pfn); 262 if (!page_initialized(page)) 263 return -1; 264 return pfn_to_nid(pfn); 265 } 266 267 /* register memory section under specified node if it spans that node */ 268 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) 269 { 270 unsigned long pfn, sect_start_pfn, sect_end_pfn; 271 272 if (!mem_blk) 273 return -EFAULT; 274 if (!node_online(nid)) 275 return 0; 276 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); 277 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; 278 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 279 int page_nid; 280 281 page_nid = get_nid_for_pfn(pfn); 282 if (page_nid < 0) 283 continue; 284 if (page_nid != nid) 285 continue; 286 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, 287 &mem_blk->sysdev.kobj, 288 kobject_name(&mem_blk->sysdev.kobj)); 289 } 290 /* mem section does not span the specified node */ 291 return 0; 292 } 293 294 /* unregister memory section under all nodes that it spans */ 295 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) 296 { 297 nodemask_t unlinked_nodes; 298 unsigned long pfn, sect_start_pfn, sect_end_pfn; 299 300 if (!mem_blk) 301 return -EFAULT; 302 nodes_clear(unlinked_nodes); 303 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); 304 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; 305 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { 306 int nid; 307 308 nid = get_nid_for_pfn(pfn); 309 if (nid < 0) 310 continue; 311 if (!node_online(nid)) 312 continue; 313 if (node_test_and_set(nid, unlinked_nodes)) 314 continue; 315 sysfs_remove_link(&node_devices[nid].sysdev.kobj, 316 kobject_name(&mem_blk->sysdev.kobj)); 317 } 318 return 0; 319 } 320 321 static int link_mem_sections(int nid) 322 { 323 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; 324 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; 325 unsigned long pfn; 326 int err = 0; 327 328 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { 329 unsigned long section_nr = pfn_to_section_nr(pfn); 330 struct mem_section *mem_sect; 331 struct memory_block *mem_blk; 332 int ret; 333 334 if (!present_section_nr(section_nr)) 335 continue; 336 mem_sect = __nr_to_section(section_nr); 337 mem_blk = find_memory_block(mem_sect); 338 ret = register_mem_sect_under_node(mem_blk, nid); 339 if (!err) 340 err = ret; 341 342 /* discard ref obtained in find_memory_block() */ 343 kobject_put(&mem_blk->sysdev.kobj); 344 } 345 return err; 346 } 347 #else 348 static int link_mem_sections(int nid) { return 0; } 349 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 350 351 int register_one_node(int nid) 352 { 353 int error = 0; 354 int cpu; 355 356 if (node_online(nid)) { 357 int p_node = parent_node(nid); 358 struct node *parent = NULL; 359 360 if (p_node != nid) 361 parent = &node_devices[p_node]; 362 363 error = register_node(&node_devices[nid], nid, parent); 364 365 /* link cpu under this node */ 366 for_each_present_cpu(cpu) { 367 if (cpu_to_node(cpu) == nid) 368 register_cpu_under_node(cpu, nid); 369 } 370 371 /* link memory sections under this node */ 372 error = link_mem_sections(nid); 373 } 374 375 return error; 376 377 } 378 379 void unregister_one_node(int nid) 380 { 381 unregister_node(&node_devices[nid]); 382 } 383 384 /* 385 * node states attributes 386 */ 387 388 static ssize_t print_nodes_state(enum node_states state, char *buf) 389 { 390 int n; 391 392 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); 393 if (n > 0 && PAGE_SIZE > n + 1) { 394 *(buf + n++) = '\n'; 395 *(buf + n++) = '\0'; 396 } 397 return n; 398 } 399 400 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf) 401 { 402 return print_nodes_state(N_POSSIBLE, buf); 403 } 404 405 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf) 406 { 407 return print_nodes_state(N_ONLINE, buf); 408 } 409 410 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class, 411 char *buf) 412 { 413 return print_nodes_state(N_NORMAL_MEMORY, buf); 414 } 415 416 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf) 417 { 418 return print_nodes_state(N_CPU, buf); 419 } 420 421 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL); 422 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL); 423 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory, 424 NULL); 425 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL); 426 427 #ifdef CONFIG_HIGHMEM 428 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class, 429 char *buf) 430 { 431 return print_nodes_state(N_HIGH_MEMORY, buf); 432 } 433 434 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory, 435 NULL); 436 #endif 437 438 struct sysdev_class_attribute *node_state_attr[] = { 439 &attr_possible, 440 &attr_online, 441 &attr_has_normal_memory, 442 #ifdef CONFIG_HIGHMEM 443 &attr_has_high_memory, 444 #endif 445 &attr_has_cpu, 446 }; 447 448 static int node_states_init(void) 449 { 450 int i; 451 int err = 0; 452 453 for (i = 0; i < NR_NODE_STATES; i++) { 454 int ret; 455 ret = sysdev_class_create_file(&node_class, node_state_attr[i]); 456 if (!err) 457 err = ret; 458 } 459 return err; 460 } 461 462 static int __init register_node_type(void) 463 { 464 int ret; 465 466 ret = sysdev_class_register(&node_class); 467 if (!ret) 468 ret = node_states_init(); 469 470 /* 471 * Note: we're not going to unregister the node class if we fail 472 * to register the node state class attribute files. 473 */ 474 return ret; 475 } 476 postcore_initcall(register_node_type); 477