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