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 Shmem:          %8lu kB\n"
  89                        "Node %d KernelStack:    %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                        nid, K(node_page_state(nid, NR_UNEVICTABLE)),
 109                        nid, K(node_page_state(nid, NR_MLOCK)),
 110 #ifdef CONFIG_HIGHMEM
 111                        nid, K(i.totalhigh),
 112                        nid, K(i.freehigh),
 113                        nid, K(i.totalram - i.totalhigh),
 114                        nid, K(i.freeram - i.freehigh),
 115 #endif
 116                        nid, K(node_page_state(nid, NR_FILE_DIRTY)),
 117                        nid, K(node_page_state(nid, NR_WRITEBACK)),
 118                        nid, K(node_page_state(nid, NR_FILE_PAGES)),
 119                        nid, K(node_page_state(nid, NR_FILE_MAPPED)),
 120                        nid, K(node_page_state(nid, NR_ANON_PAGES)),
 121                        nid, K(node_page_state(nid, NR_SHMEM)),
 122                        nid, node_page_state(nid, NR_KERNEL_STACK) *
 123                                 THREAD_SIZE / 1024,
 124                        nid, K(node_page_state(nid, NR_PAGETABLE)),
 125                        nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
 126                        nid, K(node_page_state(nid, NR_BOUNCE)),
 127                        nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
 128                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
 129                                 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
 130                        nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
 131                        nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
 132         n += hugetlb_report_node_meminfo(nid, buf + n);
 133         return n;
 134 }
 135
 136 #undef K
 137 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
 138
 139 static ssize_t node_read_numastat(struct sys_device * dev,
 140                                 struct sysdev_attribute *attr, char * buf)
 141 {
 142         return sprintf(buf,
 143                        "numa_hit %lu\n"
 144                        "numa_miss %lu\n"
 145                        "numa_foreign %lu\n"
 146                        "interleave_hit %lu\n"
 147                        "local_node %lu\n"
 148                        "other_node %lu\n",
 149                        node_page_state(dev->id, NUMA_HIT),
 150                        node_page_state(dev->id, NUMA_MISS),
 151                        node_page_state(dev->id, NUMA_FOREIGN),
 152                        node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
 153                        node_page_state(dev->id, NUMA_LOCAL),
 154                        node_page_state(dev->id, NUMA_OTHER));
 155 }
 156 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 157
 158 static ssize_t node_read_distance(struct sys_device * dev,
 159                         struct sysdev_attribute *attr, char * buf)
 160 {
 161         int nid = dev->id;
 162         int len = 0;
 163         int i;
 164
 165         /* buf currently PAGE_SIZE, need ~4 chars per node */
 166         BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
 167
 168         for_each_online_node(i)
 169                 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
 170
 171         len += sprintf(buf + len, "\n");
 172         return len;
 173 }
 174 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
 175
 176
 177 /*
 178  * register_node - Setup a sysfs device for a node.
 179  * @num - Node number to use when creating the device.
 180  *
 181  * Initialize and register the node device.
 182  */
 183 int register_node(struct node *node, int num, struct node *parent)
 184 {
 185         int error;
 186
 187         node->sysdev.id = num;
 188         node->sysdev.cls = &node_class;
 189         error = sysdev_register(&node->sysdev);
 190
 191         if (!error){
 192                 sysdev_create_file(&node->sysdev, &attr_cpumap);
 193                 sysdev_create_file(&node->sysdev, &attr_cpulist);
 194                 sysdev_create_file(&node->sysdev, &attr_meminfo);
 195                 sysdev_create_file(&node->sysdev, &attr_numastat);
 196                 sysdev_create_file(&node->sysdev, &attr_distance);
 197
 198                 scan_unevictable_register_node(node);
 199         }
 200         return error;
 201 }
 202
 203 /**
 204  * unregister_node - unregister a node device
 205  * @node: node going away
 206  *
 207  * Unregisters a node device @node.  All the devices on the node must be
 208  * unregistered before calling this function.
 209  */
 210 void unregister_node(struct node *node)
 211 {
 212         sysdev_remove_file(&node->sysdev, &attr_cpumap);
 213         sysdev_remove_file(&node->sysdev, &attr_cpulist);
 214         sysdev_remove_file(&node->sysdev, &attr_meminfo);
 215         sysdev_remove_file(&node->sysdev, &attr_numastat);
 216         sysdev_remove_file(&node->sysdev, &attr_distance);
 217
 218         scan_unevictable_unregister_node(node);
 219
 220         sysdev_unregister(&node->sysdev);
 221 }
 222
 223 struct node node_devices[MAX_NUMNODES];
 224
 225 /*
 226  * register cpu under node
 227  */
 228 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 229 {
 230         if (node_online(nid)) {
 231                 struct sys_device *obj = get_cpu_sysdev(cpu);
 232                 if (!obj)
 233                         return 0;
 234                 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
 235                                          &obj->kobj,
 236                                          kobject_name(&obj->kobj));
 237          }
 238
 239         return 0;
 240 }
 241
 242 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 243 {
 244         if (node_online(nid)) {
 245                 struct sys_device *obj = get_cpu_sysdev(cpu);
 246                 if (obj)
 247                         sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 248                                          kobject_name(&obj->kobj));
 249         }
 250         return 0;
 251 }
 252
 253 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 254 #define page_initialized(page)  (page->lru.next)
 255
 256 static int get_nid_for_pfn(unsigned long pfn)
 257 {
 258         struct page *page;
 259
 260         if (!pfn_valid_within(pfn))
 261                 return -1;
 262         page = pfn_to_page(pfn);
 263         if (!page_initialized(page))
 264                 return -1;
 265         return pfn_to_nid(pfn);
 266 }
 267
 268 /* register memory section under specified node if it spans that node */
 269 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
 270 {
 271         unsigned long pfn, sect_start_pfn, sect_end_pfn;
 272
 273         if (!mem_blk)
 274                 return -EFAULT;
 275         if (!node_online(nid))
 276                 return 0;
 277         sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
 278         sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
 279         for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
 280                 int page_nid;
 281
 282                 page_nid = get_nid_for_pfn(pfn);
 283                 if (page_nid < 0)
 284                         continue;
 285                 if (page_nid != nid)
 286                         continue;
 287                 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
 288                                         &mem_blk->sysdev.kobj,
 289                                         kobject_name(&mem_blk->sysdev.kobj));
 290         }
 291         /* mem section does not span the specified node */
 292         return 0;
 293 }
 294
 295 /* unregister memory section under all nodes that it spans */
 296 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
 297 {
 298         nodemask_t unlinked_nodes;
 299         unsigned long pfn, sect_start_pfn, sect_end_pfn;
 300
 301         if (!mem_blk)
 302                 return -EFAULT;
 303         nodes_clear(unlinked_nodes);
 304         sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
 305         sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
 306         for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
 307                 int nid;
 308
 309                 nid = get_nid_for_pfn(pfn);
 310                 if (nid < 0)
 311                         continue;
 312                 if (!node_online(nid))
 313                         continue;
 314                 if (node_test_and_set(nid, unlinked_nodes))
 315                         continue;
 316                 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 317                          kobject_name(&mem_blk->sysdev.kobj));
 318         }
 319         return 0;
 320 }
 321
 322 static int link_mem_sections(int nid)
 323 {
 324         unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
 325         unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
 326         unsigned long pfn;
 327         int err = 0;
 328
 329         for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
 330                 unsigned long section_nr = pfn_to_section_nr(pfn);
 331                 struct mem_section *mem_sect;
 332                 struct memory_block *mem_blk;
 333                 int ret;
 334
 335                 if (!present_section_nr(section_nr))
 336                         continue;
 337                 mem_sect = __nr_to_section(section_nr);
 338                 mem_blk = find_memory_block(mem_sect);
 339                 ret = register_mem_sect_under_node(mem_blk, nid);
 340                 if (!err)
 341                         err = ret;
 342
 343                 /* discard ref obtained in find_memory_block() */
 344                 kobject_put(&mem_blk->sysdev.kobj);
 345         }
 346         return err;
 347 }
 348 #else
 349 static int link_mem_sections(int nid) { return 0; }
 350 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
 351
 352 int register_one_node(int nid)
 353 {
 354         int error = 0;
 355         int cpu;
 356
 357         if (node_online(nid)) {
 358                 int p_node = parent_node(nid);
 359                 struct node *parent = NULL;
 360
 361                 if (p_node != nid)
 362                         parent = &node_devices[p_node];
 363
 364                 error = register_node(&node_devices[nid], nid, parent);
 365
 366                 /* link cpu under this node */
 367                 for_each_present_cpu(cpu) {
 368                         if (cpu_to_node(cpu) == nid)
 369                                 register_cpu_under_node(cpu, nid);
 370                 }
 371
 372                 /* link memory sections under this node */
 373                 error = link_mem_sections(nid);
 374         }
 375
 376         return error;
 377
 378 }
 379
 380 void unregister_one_node(int nid)
 381 {
 382         unregister_node(&node_devices[nid]);
 383 }
 384
 385 /*
 386  * node states attributes
 387  */
 388
 389 static ssize_t print_nodes_state(enum node_states state, char *buf)
 390 {
 391         int n;
 392
 393         n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
 394         if (n > 0 && PAGE_SIZE > n + 1) {
 395                 *(buf + n++) = '\n';
 396                 *(buf + n++) = '\0';
 397         }
 398         return n;
 399 }
 400
 401 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
 402 {
 403         return print_nodes_state(N_POSSIBLE, buf);
 404 }
 405
 406 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
 407 {
 408         return print_nodes_state(N_ONLINE, buf);
 409 }
 410
 411 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
 412                                                 char *buf)
 413 {
 414         return print_nodes_state(N_NORMAL_MEMORY, buf);
 415 }
 416
 417 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
 418 {
 419         return print_nodes_state(N_CPU, buf);
 420 }
 421
 422 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
 423 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
 424 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
 425                                                                         NULL);
 426 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
 427
 428 #ifdef CONFIG_HIGHMEM
 429 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
 430                                                  char *buf)
 431 {
 432         return print_nodes_state(N_HIGH_MEMORY, buf);
 433 }
 434
 435 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
 436                                                                          NULL);
 437 #endif
 438
 439 struct sysdev_class_attribute *node_state_attr[] = {
 440         &attr_possible,
 441         &attr_online,
 442         &attr_has_normal_memory,
 443 #ifdef CONFIG_HIGHMEM
 444         &attr_has_high_memory,
 445 #endif
 446         &attr_has_cpu,
 447 };
 448
 449 static int node_states_init(void)
 450 {
 451         int i;
 452         int err = 0;
 453
 454         for (i = 0;  i < NR_NODE_STATES; i++) {
 455                 int ret;
 456                 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
 457                 if (!err)
 458                         err = ret;
 459         }
 460         return err;
 461 }
 462
 463 static int __init register_node_type(void)
 464 {
 465         int ret;
 466
 467         ret = sysdev_class_register(&node_class);
 468         if (!ret)
 469                 ret = node_states_init();
 470
 471         /*
 472          * Note:  we're not going to unregister the node class if we fail
 473          * to register the node state class attribute files.
 474          */
 475         return ret;
 476 }
 477 postcore_initcall(register_node_type);