Commit | Line | Data |
---|---|---|
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); | |
a70f7302 | 27 | const struct cpumask *mask = cpumask_of_node(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" | |
5344b7e6 NP |
75 | "Node %d Unevictable: %8lu kB\n" |
76 | "Node %d Mlocked: %8lu kB\n" | |
182e8e23 | 77 | #ifdef CONFIG_HIGHMEM |
4f98a2fe RR |
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" | |
182e8e23 | 82 | #endif |
4f98a2fe RR |
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" | |
4b02108a | 88 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 89 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
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 | 108 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), |
5344b7e6 | 109 | nid, K(node_page_state(nid, NR_MLOCK)), |
182e8e23 | 110 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
111 | nid, K(i.totalhigh), |
112 | nid, K(i.freehigh), | |
113 | nid, K(i.totalram - i.totalhigh), | |
c07e02db | 114 | nid, K(i.freeram - i.freehigh), |
182e8e23 | 115 | #endif |
b1e7a8fd | 116 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
ce866b34 | 117 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
347ce434 | 118 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
65ba55f5 | 119 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
f3dbd344 | 120 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
4b02108a | 121 | nid, K(node_page_state(nid, NR_SHMEM)), |
c6a7f572 KM |
122 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
123 | THREAD_SIZE / 1024, | |
df849a15 | 124 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
fd39fc85 | 125 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
d2c5e30c | 126 | nid, K(node_page_state(nid, NR_BOUNCE)), |
fc3ba692 | 127 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
972d1a7b CL |
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))); | |
1da177e4 LT |
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 | ||
4a0b2b4d AK |
139 | static ssize_t node_read_numastat(struct sys_device * dev, |
140 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 | 141 | { |
1da177e4 LT |
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", | |
ca889e6c CL |
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)); | |
1da177e4 LT |
155 | } |
156 | static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); | |
157 | ||
4a0b2b4d AK |
158 | static ssize_t node_read_distance(struct sys_device * dev, |
159 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
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 | ||
9a305230 LS |
176 | #ifdef CONFIG_HUGETLBFS |
177 | /* | |
178 | * hugetlbfs per node attributes registration interface: | |
179 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
180 | * it will register its per node attributes for all online nodes with |
181 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
182 | * register its attribute registration functions with this node driver. |
183 | * Once these hooks have been initialized, the node driver will call into | |
184 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
185 | */ | |
186 | static node_registration_func_t __hugetlb_register_node; | |
187 | static node_registration_func_t __hugetlb_unregister_node; | |
188 | ||
39da08cb | 189 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 190 | { |
4faf8d95 | 191 | if (__hugetlb_register_node && |
39da08cb | 192 | node_state(node->sysdev.id, N_HIGH_MEMORY)) { |
9a305230 | 193 | __hugetlb_register_node(node); |
39da08cb LS |
194 | return true; |
195 | } | |
196 | return false; | |
9a305230 LS |
197 | } |
198 | ||
199 | static inline void hugetlb_unregister_node(struct node *node) | |
200 | { | |
201 | if (__hugetlb_unregister_node) | |
202 | __hugetlb_unregister_node(node); | |
203 | } | |
204 | ||
205 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
206 | node_registration_func_t unregister) | |
207 | { | |
208 | __hugetlb_register_node = doregister; | |
209 | __hugetlb_unregister_node = unregister; | |
210 | } | |
211 | #else | |
212 | static inline void hugetlb_register_node(struct node *node) {} | |
213 | ||
214 | static inline void hugetlb_unregister_node(struct node *node) {} | |
215 | #endif | |
216 | ||
1da177e4 LT |
217 | |
218 | /* | |
405ae7d3 | 219 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
220 | * @num - Node number to use when creating the device. |
221 | * | |
222 | * Initialize and register the node device. | |
223 | */ | |
4b45099b | 224 | int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
225 | { |
226 | int error; | |
227 | ||
228 | node->sysdev.id = num; | |
229 | node->sysdev.cls = &node_class; | |
230 | error = sysdev_register(&node->sysdev); | |
231 | ||
232 | if (!error){ | |
233 | sysdev_create_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 234 | sysdev_create_file(&node->sysdev, &attr_cpulist); |
1da177e4 LT |
235 | sysdev_create_file(&node->sysdev, &attr_meminfo); |
236 | sysdev_create_file(&node->sysdev, &attr_numastat); | |
237 | sysdev_create_file(&node->sysdev, &attr_distance); | |
af936a16 LS |
238 | |
239 | scan_unevictable_register_node(node); | |
4faf8d95 | 240 | |
9a305230 | 241 | hugetlb_register_node(node); |
1da177e4 LT |
242 | } |
243 | return error; | |
244 | } | |
245 | ||
4b45099b KT |
246 | /** |
247 | * unregister_node - unregister a node device | |
248 | * @node: node going away | |
249 | * | |
250 | * Unregisters a node device @node. All the devices on the node must be | |
251 | * unregistered before calling this function. | |
252 | */ | |
253 | void unregister_node(struct node *node) | |
254 | { | |
255 | sysdev_remove_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 256 | sysdev_remove_file(&node->sysdev, &attr_cpulist); |
4b45099b KT |
257 | sysdev_remove_file(&node->sysdev, &attr_meminfo); |
258 | sysdev_remove_file(&node->sysdev, &attr_numastat); | |
259 | sysdev_remove_file(&node->sysdev, &attr_distance); | |
260 | ||
af936a16 | 261 | scan_unevictable_unregister_node(node); |
4faf8d95 | 262 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
af936a16 | 263 | |
4b45099b KT |
264 | sysdev_unregister(&node->sysdev); |
265 | } | |
1da177e4 | 266 | |
0fc44159 YG |
267 | struct node node_devices[MAX_NUMNODES]; |
268 | ||
76b67ed9 KH |
269 | /* |
270 | * register cpu under node | |
271 | */ | |
272 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
273 | { | |
1830794a | 274 | int ret; |
f8246f31 | 275 | struct sys_device *obj; |
76b67ed9 | 276 | |
f8246f31 AC |
277 | if (!node_online(nid)) |
278 | return 0; | |
279 | ||
280 | obj = get_cpu_sysdev(cpu); | |
281 | if (!obj) | |
282 | return 0; | |
283 | ||
1830794a | 284 | ret = sysfs_create_link(&node_devices[nid].sysdev.kobj, |
f8246f31 AC |
285 | &obj->kobj, |
286 | kobject_name(&obj->kobj)); | |
1830794a AC |
287 | if (ret) |
288 | return ret; | |
289 | ||
290 | return sysfs_create_link(&obj->kobj, | |
291 | &node_devices[nid].sysdev.kobj, | |
292 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
76b67ed9 KH |
293 | } |
294 | ||
295 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
296 | { | |
b9d52dad AC |
297 | struct sys_device *obj; |
298 | ||
299 | if (!node_online(nid)) | |
300 | return 0; | |
301 | ||
302 | obj = get_cpu_sysdev(cpu); | |
303 | if (!obj) | |
304 | return 0; | |
305 | ||
306 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
307 | kobject_name(&obj->kobj)); | |
1830794a AC |
308 | sysfs_remove_link(&obj->kobj, |
309 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
b9d52dad | 310 | |
76b67ed9 KH |
311 | return 0; |
312 | } | |
313 | ||
c04fc586 GH |
314 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
315 | #define page_initialized(page) (page->lru.next) | |
316 | ||
317 | static int get_nid_for_pfn(unsigned long pfn) | |
318 | { | |
319 | struct page *page; | |
320 | ||
321 | if (!pfn_valid_within(pfn)) | |
322 | return -1; | |
323 | page = pfn_to_page(pfn); | |
324 | if (!page_initialized(page)) | |
325 | return -1; | |
326 | return pfn_to_nid(pfn); | |
327 | } | |
328 | ||
329 | /* register memory section under specified node if it spans that node */ | |
330 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) | |
331 | { | |
dee5d0d5 | 332 | int ret; |
c04fc586 GH |
333 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
334 | ||
335 | if (!mem_blk) | |
336 | return -EFAULT; | |
337 | if (!node_online(nid)) | |
338 | return 0; | |
339 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); | |
340 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
341 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
342 | int page_nid; | |
343 | ||
344 | page_nid = get_nid_for_pfn(pfn); | |
345 | if (page_nid < 0) | |
346 | continue; | |
347 | if (page_nid != nid) | |
348 | continue; | |
dee5d0d5 | 349 | ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, |
c04fc586 GH |
350 | &mem_blk->sysdev.kobj, |
351 | kobject_name(&mem_blk->sysdev.kobj)); | |
dee5d0d5 AC |
352 | if (ret) |
353 | return ret; | |
354 | ||
355 | return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj, | |
356 | &node_devices[nid].sysdev.kobj, | |
357 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
c04fc586 GH |
358 | } |
359 | /* mem section does not span the specified node */ | |
360 | return 0; | |
361 | } | |
362 | ||
363 | /* unregister memory section under all nodes that it spans */ | |
364 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) | |
365 | { | |
9ae49fab | 366 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
c04fc586 GH |
367 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
368 | ||
9ae49fab DR |
369 | if (!mem_blk) { |
370 | NODEMASK_FREE(unlinked_nodes); | |
c04fc586 | 371 | return -EFAULT; |
9ae49fab DR |
372 | } |
373 | if (!unlinked_nodes) | |
374 | return -ENOMEM; | |
375 | nodes_clear(*unlinked_nodes); | |
c04fc586 GH |
376 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); |
377 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
378 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
47504980 | 379 | int nid; |
c04fc586 GH |
380 | |
381 | nid = get_nid_for_pfn(pfn); | |
382 | if (nid < 0) | |
383 | continue; | |
384 | if (!node_online(nid)) | |
385 | continue; | |
9ae49fab | 386 | if (node_test_and_set(nid, *unlinked_nodes)) |
c04fc586 GH |
387 | continue; |
388 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
389 | kobject_name(&mem_blk->sysdev.kobj)); | |
dee5d0d5 AC |
390 | sysfs_remove_link(&mem_blk->sysdev.kobj, |
391 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
c04fc586 | 392 | } |
9ae49fab | 393 | NODEMASK_FREE(unlinked_nodes); |
c04fc586 GH |
394 | return 0; |
395 | } | |
396 | ||
397 | static int link_mem_sections(int nid) | |
398 | { | |
399 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; | |
400 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; | |
401 | unsigned long pfn; | |
402 | int err = 0; | |
403 | ||
404 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
405 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
406 | struct mem_section *mem_sect; | |
407 | struct memory_block *mem_blk; | |
408 | int ret; | |
409 | ||
410 | if (!present_section_nr(section_nr)) | |
411 | continue; | |
412 | mem_sect = __nr_to_section(section_nr); | |
413 | mem_blk = find_memory_block(mem_sect); | |
414 | ret = register_mem_sect_under_node(mem_blk, nid); | |
415 | if (!err) | |
416 | err = ret; | |
417 | ||
418 | /* discard ref obtained in find_memory_block() */ | |
419 | kobject_put(&mem_blk->sysdev.kobj); | |
420 | } | |
421 | return err; | |
422 | } | |
4faf8d95 | 423 | |
39da08cb | 424 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
425 | /* |
426 | * Handle per node hstate attribute [un]registration on transistions | |
427 | * to/from memoryless state. | |
428 | */ | |
39da08cb LS |
429 | static void node_hugetlb_work(struct work_struct *work) |
430 | { | |
431 | struct node *node = container_of(work, struct node, node_work); | |
432 | ||
433 | /* | |
434 | * We only get here when a node transitions to/from memoryless state. | |
435 | * We can detect which transition occurred by examining whether the | |
436 | * node has memory now. hugetlb_register_node() already check this | |
437 | * so we try to register the attributes. If that fails, then the | |
438 | * node has transitioned to memoryless, try to unregister the | |
439 | * attributes. | |
440 | */ | |
441 | if (!hugetlb_register_node(node)) | |
442 | hugetlb_unregister_node(node); | |
443 | } | |
444 | ||
445 | static void init_node_hugetlb_work(int nid) | |
446 | { | |
447 | INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); | |
448 | } | |
4faf8d95 LS |
449 | |
450 | static int node_memory_callback(struct notifier_block *self, | |
451 | unsigned long action, void *arg) | |
452 | { | |
453 | struct memory_notify *mnb = arg; | |
454 | int nid = mnb->status_change_nid; | |
455 | ||
456 | switch (action) { | |
39da08cb LS |
457 | case MEM_ONLINE: |
458 | case MEM_OFFLINE: | |
459 | /* | |
460 | * offload per node hstate [un]registration to a work thread | |
461 | * when transitioning to/from memoryless state. | |
462 | */ | |
4faf8d95 | 463 | if (nid != NUMA_NO_NODE) |
39da08cb | 464 | schedule_work(&node_devices[nid].node_work); |
4faf8d95 | 465 | break; |
39da08cb | 466 | |
4faf8d95 LS |
467 | case MEM_GOING_ONLINE: |
468 | case MEM_GOING_OFFLINE: | |
469 | case MEM_CANCEL_ONLINE: | |
470 | case MEM_CANCEL_OFFLINE: | |
471 | default: | |
472 | break; | |
473 | } | |
474 | ||
475 | return NOTIFY_OK; | |
476 | } | |
39da08cb LS |
477 | #endif /* CONFIG_HUGETLBFS */ |
478 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
479 | ||
c04fc586 | 480 | static int link_mem_sections(int nid) { return 0; } |
39da08cb | 481 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 482 | |
39da08cb LS |
483 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
484 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
485 | static inline int node_memory_callback(struct notifier_block *self, |
486 | unsigned long action, void *arg) | |
487 | { | |
488 | return NOTIFY_OK; | |
489 | } | |
39da08cb LS |
490 | |
491 | static void init_node_hugetlb_work(int nid) { } | |
492 | ||
493 | #endif | |
c04fc586 | 494 | |
0fc44159 YG |
495 | int register_one_node(int nid) |
496 | { | |
497 | int error = 0; | |
76b67ed9 | 498 | int cpu; |
0fc44159 YG |
499 | |
500 | if (node_online(nid)) { | |
501 | int p_node = parent_node(nid); | |
502 | struct node *parent = NULL; | |
503 | ||
504 | if (p_node != nid) | |
505 | parent = &node_devices[p_node]; | |
506 | ||
507 | error = register_node(&node_devices[nid], nid, parent); | |
76b67ed9 KH |
508 | |
509 | /* link cpu under this node */ | |
510 | for_each_present_cpu(cpu) { | |
511 | if (cpu_to_node(cpu) == nid) | |
512 | register_cpu_under_node(cpu, nid); | |
513 | } | |
c04fc586 GH |
514 | |
515 | /* link memory sections under this node */ | |
516 | error = link_mem_sections(nid); | |
39da08cb LS |
517 | |
518 | /* initialize work queue for memory hot plug */ | |
519 | init_node_hugetlb_work(nid); | |
0fc44159 YG |
520 | } |
521 | ||
522 | return error; | |
523 | ||
524 | } | |
525 | ||
526 | void unregister_one_node(int nid) | |
527 | { | |
528 | unregister_node(&node_devices[nid]); | |
529 | } | |
530 | ||
bde631a5 LS |
531 | /* |
532 | * node states attributes | |
533 | */ | |
534 | ||
535 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
536 | { | |
537 | int n; | |
538 | ||
539 | n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); | |
540 | if (n > 0 && PAGE_SIZE > n + 1) { | |
541 | *(buf + n++) = '\n'; | |
542 | *(buf + n++) = '\0'; | |
543 | } | |
544 | return n; | |
545 | } | |
546 | ||
b15f562f AK |
547 | struct node_attr { |
548 | struct sysdev_class_attribute attr; | |
549 | enum node_states state; | |
550 | }; | |
bde631a5 | 551 | |
b15f562f AK |
552 | static ssize_t show_node_state(struct sysdev_class *class, |
553 | struct sysdev_class_attribute *attr, char *buf) | |
bde631a5 | 554 | { |
b15f562f AK |
555 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
556 | return print_nodes_state(na->state, buf); | |
bde631a5 LS |
557 | } |
558 | ||
b15f562f AK |
559 | #define _NODE_ATTR(name, state) \ |
560 | { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state } | |
bde631a5 | 561 | |
b15f562f AK |
562 | static struct node_attr node_state_attr[] = { |
563 | _NODE_ATTR(possible, N_POSSIBLE), | |
564 | _NODE_ATTR(online, N_ONLINE), | |
565 | _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), | |
566 | _NODE_ATTR(has_cpu, N_CPU), | |
bde631a5 | 567 | #ifdef CONFIG_HIGHMEM |
b15f562f | 568 | _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
bde631a5 | 569 | #endif |
bde631a5 LS |
570 | }; |
571 | ||
572 | static int node_states_init(void) | |
573 | { | |
574 | int i; | |
575 | int err = 0; | |
576 | ||
b15f562f | 577 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
bde631a5 LS |
578 | for (i = 0; i < NR_NODE_STATES; i++) { |
579 | int ret; | |
b15f562f | 580 | ret = sysdev_class_create_file(&node_class, &node_state_attr[i].attr); |
bde631a5 LS |
581 | if (!err) |
582 | err = ret; | |
583 | } | |
584 | return err; | |
585 | } | |
586 | ||
4faf8d95 | 587 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 588 | static int __init register_node_type(void) |
1da177e4 | 589 | { |
bde631a5 LS |
590 | int ret; |
591 | ||
592 | ret = sysdev_class_register(&node_class); | |
4faf8d95 | 593 | if (!ret) { |
bde631a5 | 594 | ret = node_states_init(); |
4faf8d95 LS |
595 | hotplug_memory_notifier(node_memory_callback, |
596 | NODE_CALLBACK_PRI); | |
597 | } | |
bde631a5 LS |
598 | |
599 | /* | |
600 | * Note: we're not going to unregister the node class if we fail | |
601 | * to register the node state class attribute files. | |
602 | */ | |
603 | return ret; | |
1da177e4 LT |
604 | } |
605 | postcore_initcall(register_node_type); |