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                        "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);