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Commit | Line | Data |
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1da177e4 LT |
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> | |
c04fc586 | 9 | #include <linux/memory.h> |
1da177e4 LT |
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> | |
76b67ed9 | 15 | #include <linux/cpu.h> |
bde631a5 | 16 | #include <linux/device.h> |
af936a16 | 17 | #include <linux/swap.h> |
1da177e4 LT |
18 | |
19 | static struct sysdev_class node_class = { | |
af5ca3f4 | 20 | .name = "node", |
1da177e4 LT |
21 | }; |
22 | ||
23 | ||
39106dcf | 24 | static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) |
1da177e4 LT |
25 | { |
26 | struct node *node_dev = to_node(dev); | |
c5f59f08 | 27 | node_to_cpumask_ptr(mask, node_dev->sysdev.id); |
1da177e4 LT |
28 | int len; |
29 | ||
39106dcf MT |
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)); | |
1da177e4 | 32 | |
39106dcf | 33 | len = type? |
29c0177e RR |
34 | cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : |
35 | cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
c5f59f08 MT |
36 | buf[len++] = '\n'; |
37 | buf[len] = '\0'; | |
1da177e4 LT |
38 | return len; |
39 | } | |
40 | ||
4a0b2b4d AK |
41 | static inline ssize_t node_read_cpumask(struct sys_device *dev, |
42 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
43 | { |
44 | return node_read_cpumap(dev, 0, buf); | |
45 | } | |
4a0b2b4d AK |
46 | static inline ssize_t node_read_cpulist(struct sys_device *dev, |
47 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
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); | |
1da177e4 LT |
54 | |
55 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
4a0b2b4d AK |
56 | static ssize_t node_read_meminfo(struct sys_device * dev, |
57 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
58 | { |
59 | int n; | |
60 | int nid = dev->id; | |
61 | struct sysinfo i; | |
1da177e4 LT |
62 | |
63 | si_meminfo_node(&i, nid); | |
c07e02db | 64 | |
1da177e4 | 65 | n = sprintf(buf, "\n" |
4f98a2fe RR |
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" | |
7b854121 | 75 | #ifdef CONFIG_UNEVICTABLE_LRU |
5344b7e6 NP |
76 | "Node %d Unevictable: %8lu kB\n" |
77 | "Node %d Mlocked: %8lu kB\n" | |
7b854121 | 78 | #endif |
182e8e23 | 79 | #ifdef CONFIG_HIGHMEM |
4f98a2fe RR |
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" | |
182e8e23 | 84 | #endif |
4f98a2fe RR |
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", | |
1da177e4 LT |
97 | nid, K(i.totalram), |
98 | nid, K(i.freeram), | |
99 | nid, K(i.totalram - i.freeram), | |
4f98a2fe RR |
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)), | |
7b854121 LS |
108 | #ifdef CONFIG_UNEVICTABLE_LRU |
109 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), | |
5344b7e6 | 110 | nid, K(node_page_state(nid, NR_MLOCK)), |
7b854121 | 111 | #endif |
182e8e23 | 112 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
113 | nid, K(i.totalhigh), |
114 | nid, K(i.freehigh), | |
115 | nid, K(i.totalram - i.totalhigh), | |
c07e02db | 116 | nid, K(i.freeram - i.freehigh), |
182e8e23 | 117 | #endif |
b1e7a8fd | 118 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
ce866b34 | 119 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
347ce434 | 120 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
65ba55f5 | 121 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
f3dbd344 | 122 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
df849a15 | 123 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
fd39fc85 | 124 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
d2c5e30c | 125 | nid, K(node_page_state(nid, NR_BOUNCE)), |
fc3ba692 | 126 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
972d1a7b CL |
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))); | |
1da177e4 LT |
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 | ||
4a0b2b4d AK |
138 | static ssize_t node_read_numastat(struct sys_device * dev, |
139 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 | 140 | { |
1da177e4 LT |
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", | |
ca889e6c CL |
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)); | |
1da177e4 LT |
154 | } |
155 | static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); | |
156 | ||
4a0b2b4d AK |
157 | static ssize_t node_read_distance(struct sys_device * dev, |
158 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
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 | /* | |
405ae7d3 | 177 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
178 | * @num - Node number to use when creating the device. |
179 | * | |
180 | * Initialize and register the node device. | |
181 | */ | |
4b45099b | 182 | int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
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); | |
39106dcf | 192 | sysdev_create_file(&node->sysdev, &attr_cpulist); |
1da177e4 LT |
193 | sysdev_create_file(&node->sysdev, &attr_meminfo); |
194 | sysdev_create_file(&node->sysdev, &attr_numastat); | |
195 | sysdev_create_file(&node->sysdev, &attr_distance); | |
af936a16 LS |
196 | |
197 | scan_unevictable_register_node(node); | |
1da177e4 LT |
198 | } |
199 | return error; | |
200 | } | |
201 | ||
4b45099b KT |
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); | |
39106dcf | 212 | sysdev_remove_file(&node->sysdev, &attr_cpulist); |
4b45099b KT |
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 | ||
af936a16 LS |
217 | scan_unevictable_unregister_node(node); |
218 | ||
4b45099b KT |
219 | sysdev_unregister(&node->sysdev); |
220 | } | |
1da177e4 | 221 | |
0fc44159 YG |
222 | struct node node_devices[MAX_NUMNODES]; |
223 | ||
76b67ed9 KH |
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 | ||
c04fc586 GH |
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++) { | |
47504980 | 306 | int nid; |
c04fc586 GH |
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 | ||
0fc44159 YG |
351 | int register_one_node(int nid) |
352 | { | |
353 | int error = 0; | |
76b67ed9 | 354 | int cpu; |
0fc44159 YG |
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); | |
76b67ed9 KH |
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 | } | |
c04fc586 GH |
370 | |
371 | /* link memory sections under this node */ | |
372 | error = link_mem_sections(nid); | |
0fc44159 YG |
373 | } |
374 | ||
375 | return error; | |
376 | ||
377 | } | |
378 | ||
379 | void unregister_one_node(int nid) | |
380 | { | |
381 | unregister_node(&node_devices[nid]); | |
382 | } | |
383 | ||
bde631a5 LS |
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 | ||
4b45099b | 462 | static int __init register_node_type(void) |
1da177e4 | 463 | { |
bde631a5 LS |
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; | |
1da177e4 LT |
475 | } |
476 | postcore_initcall(register_node_type); |