drivers/base/node.c

   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);