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 | 18 | |
3701cde6 AK |
19 | static struct sysdev_class_attribute *node_state_attrs[]; |
20 | ||
1da177e4 | 21 | static struct sysdev_class node_class = { |
af5ca3f4 | 22 | .name = "node", |
3701cde6 | 23 | .attrs = node_state_attrs, |
1da177e4 LT |
24 | }; |
25 | ||
26 | ||
39106dcf | 27 | static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf) |
1da177e4 LT |
28 | { |
29 | struct node *node_dev = to_node(dev); | |
a70f7302 | 30 | const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id); |
1da177e4 LT |
31 | int len; |
32 | ||
39106dcf MT |
33 | /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
34 | BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); | |
1da177e4 | 35 | |
39106dcf | 36 | len = type? |
29c0177e RR |
37 | cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : |
38 | cpumask_scnprintf(buf, PAGE_SIZE-2, mask); | |
c5f59f08 MT |
39 | buf[len++] = '\n'; |
40 | buf[len] = '\0'; | |
1da177e4 LT |
41 | return len; |
42 | } | |
43 | ||
4a0b2b4d AK |
44 | static inline ssize_t node_read_cpumask(struct sys_device *dev, |
45 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
46 | { |
47 | return node_read_cpumap(dev, 0, buf); | |
48 | } | |
4a0b2b4d AK |
49 | static inline ssize_t node_read_cpulist(struct sys_device *dev, |
50 | struct sysdev_attribute *attr, char *buf) | |
39106dcf MT |
51 | { |
52 | return node_read_cpumap(dev, 1, buf); | |
53 | } | |
54 | ||
55 | static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); | |
56 | static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); | |
1da177e4 LT |
57 | |
58 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
4a0b2b4d AK |
59 | static ssize_t node_read_meminfo(struct sys_device * dev, |
60 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
61 | { |
62 | int n; | |
63 | int nid = dev->id; | |
64 | struct sysinfo i; | |
1da177e4 LT |
65 | |
66 | si_meminfo_node(&i, nid); | |
c07e02db | 67 | |
1da177e4 | 68 | n = sprintf(buf, "\n" |
4f98a2fe RR |
69 | "Node %d MemTotal: %8lu kB\n" |
70 | "Node %d MemFree: %8lu kB\n" | |
71 | "Node %d MemUsed: %8lu kB\n" | |
72 | "Node %d Active: %8lu kB\n" | |
73 | "Node %d Inactive: %8lu kB\n" | |
74 | "Node %d Active(anon): %8lu kB\n" | |
75 | "Node %d Inactive(anon): %8lu kB\n" | |
76 | "Node %d Active(file): %8lu kB\n" | |
77 | "Node %d Inactive(file): %8lu kB\n" | |
5344b7e6 NP |
78 | "Node %d Unevictable: %8lu kB\n" |
79 | "Node %d Mlocked: %8lu kB\n" | |
182e8e23 | 80 | #ifdef CONFIG_HIGHMEM |
4f98a2fe RR |
81 | "Node %d HighTotal: %8lu kB\n" |
82 | "Node %d HighFree: %8lu kB\n" | |
83 | "Node %d LowTotal: %8lu kB\n" | |
84 | "Node %d LowFree: %8lu kB\n" | |
182e8e23 | 85 | #endif |
4f98a2fe RR |
86 | "Node %d Dirty: %8lu kB\n" |
87 | "Node %d Writeback: %8lu kB\n" | |
88 | "Node %d FilePages: %8lu kB\n" | |
89 | "Node %d Mapped: %8lu kB\n" | |
90 | "Node %d AnonPages: %8lu kB\n" | |
4b02108a | 91 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 92 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
93 | "Node %d PageTables: %8lu kB\n" |
94 | "Node %d NFS_Unstable: %8lu kB\n" | |
95 | "Node %d Bounce: %8lu kB\n" | |
96 | "Node %d WritebackTmp: %8lu kB\n" | |
97 | "Node %d Slab: %8lu kB\n" | |
98 | "Node %d SReclaimable: %8lu kB\n" | |
99 | "Node %d SUnreclaim: %8lu kB\n", | |
1da177e4 LT |
100 | nid, K(i.totalram), |
101 | nid, K(i.freeram), | |
102 | nid, K(i.totalram - i.freeram), | |
4f98a2fe RR |
103 | nid, K(node_page_state(nid, NR_ACTIVE_ANON) + |
104 | node_page_state(nid, NR_ACTIVE_FILE)), | |
105 | nid, K(node_page_state(nid, NR_INACTIVE_ANON) + | |
106 | node_page_state(nid, NR_INACTIVE_FILE)), | |
107 | nid, K(node_page_state(nid, NR_ACTIVE_ANON)), | |
108 | nid, K(node_page_state(nid, NR_INACTIVE_ANON)), | |
109 | nid, K(node_page_state(nid, NR_ACTIVE_FILE)), | |
110 | nid, K(node_page_state(nid, NR_INACTIVE_FILE)), | |
7b854121 | 111 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), |
5344b7e6 | 112 | nid, K(node_page_state(nid, NR_MLOCK)), |
182e8e23 | 113 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
114 | nid, K(i.totalhigh), |
115 | nid, K(i.freehigh), | |
116 | nid, K(i.totalram - i.totalhigh), | |
c07e02db | 117 | nid, K(i.freeram - i.freehigh), |
182e8e23 | 118 | #endif |
b1e7a8fd | 119 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
ce866b34 | 120 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
347ce434 | 121 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
65ba55f5 | 122 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
f3dbd344 | 123 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
4b02108a | 124 | nid, K(node_page_state(nid, NR_SHMEM)), |
c6a7f572 KM |
125 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
126 | THREAD_SIZE / 1024, | |
df849a15 | 127 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
fd39fc85 | 128 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
d2c5e30c | 129 | nid, K(node_page_state(nid, NR_BOUNCE)), |
fc3ba692 | 130 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
972d1a7b CL |
131 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
132 | node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), | |
133 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), | |
134 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); | |
1da177e4 LT |
135 | n += hugetlb_report_node_meminfo(nid, buf + n); |
136 | return n; | |
137 | } | |
138 | ||
139 | #undef K | |
140 | static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); | |
141 | ||
4a0b2b4d AK |
142 | static ssize_t node_read_numastat(struct sys_device * dev, |
143 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 | 144 | { |
1da177e4 LT |
145 | return sprintf(buf, |
146 | "numa_hit %lu\n" | |
147 | "numa_miss %lu\n" | |
148 | "numa_foreign %lu\n" | |
149 | "interleave_hit %lu\n" | |
150 | "local_node %lu\n" | |
151 | "other_node %lu\n", | |
ca889e6c CL |
152 | node_page_state(dev->id, NUMA_HIT), |
153 | node_page_state(dev->id, NUMA_MISS), | |
154 | node_page_state(dev->id, NUMA_FOREIGN), | |
155 | node_page_state(dev->id, NUMA_INTERLEAVE_HIT), | |
156 | node_page_state(dev->id, NUMA_LOCAL), | |
157 | node_page_state(dev->id, NUMA_OTHER)); | |
1da177e4 LT |
158 | } |
159 | static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); | |
160 | ||
4a0b2b4d AK |
161 | static ssize_t node_read_distance(struct sys_device * dev, |
162 | struct sysdev_attribute *attr, char * buf) | |
1da177e4 LT |
163 | { |
164 | int nid = dev->id; | |
165 | int len = 0; | |
166 | int i; | |
167 | ||
168 | /* buf currently PAGE_SIZE, need ~4 chars per node */ | |
169 | BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2); | |
170 | ||
171 | for_each_online_node(i) | |
172 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
173 | ||
174 | len += sprintf(buf + len, "\n"); | |
175 | return len; | |
176 | } | |
177 | static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL); | |
178 | ||
9a305230 LS |
179 | #ifdef CONFIG_HUGETLBFS |
180 | /* | |
181 | * hugetlbfs per node attributes registration interface: | |
182 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
183 | * it will register its per node attributes for all online nodes with |
184 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
185 | * register its attribute registration functions with this node driver. |
186 | * Once these hooks have been initialized, the node driver will call into | |
187 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
188 | */ | |
189 | static node_registration_func_t __hugetlb_register_node; | |
190 | static node_registration_func_t __hugetlb_unregister_node; | |
191 | ||
39da08cb | 192 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 193 | { |
4faf8d95 | 194 | if (__hugetlb_register_node && |
39da08cb | 195 | node_state(node->sysdev.id, N_HIGH_MEMORY)) { |
9a305230 | 196 | __hugetlb_register_node(node); |
39da08cb LS |
197 | return true; |
198 | } | |
199 | return false; | |
9a305230 LS |
200 | } |
201 | ||
202 | static inline void hugetlb_unregister_node(struct node *node) | |
203 | { | |
204 | if (__hugetlb_unregister_node) | |
205 | __hugetlb_unregister_node(node); | |
206 | } | |
207 | ||
208 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
209 | node_registration_func_t unregister) | |
210 | { | |
211 | __hugetlb_register_node = doregister; | |
212 | __hugetlb_unregister_node = unregister; | |
213 | } | |
214 | #else | |
215 | static inline void hugetlb_register_node(struct node *node) {} | |
216 | ||
217 | static inline void hugetlb_unregister_node(struct node *node) {} | |
218 | #endif | |
219 | ||
1da177e4 LT |
220 | |
221 | /* | |
405ae7d3 | 222 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
223 | * @num - Node number to use when creating the device. |
224 | * | |
225 | * Initialize and register the node device. | |
226 | */ | |
4b45099b | 227 | int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
228 | { |
229 | int error; | |
230 | ||
231 | node->sysdev.id = num; | |
232 | node->sysdev.cls = &node_class; | |
233 | error = sysdev_register(&node->sysdev); | |
234 | ||
235 | if (!error){ | |
236 | sysdev_create_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 237 | sysdev_create_file(&node->sysdev, &attr_cpulist); |
1da177e4 LT |
238 | sysdev_create_file(&node->sysdev, &attr_meminfo); |
239 | sysdev_create_file(&node->sysdev, &attr_numastat); | |
240 | sysdev_create_file(&node->sysdev, &attr_distance); | |
af936a16 LS |
241 | |
242 | scan_unevictable_register_node(node); | |
4faf8d95 | 243 | |
9a305230 | 244 | hugetlb_register_node(node); |
1da177e4 LT |
245 | } |
246 | return error; | |
247 | } | |
248 | ||
4b45099b KT |
249 | /** |
250 | * unregister_node - unregister a node device | |
251 | * @node: node going away | |
252 | * | |
253 | * Unregisters a node device @node. All the devices on the node must be | |
254 | * unregistered before calling this function. | |
255 | */ | |
256 | void unregister_node(struct node *node) | |
257 | { | |
258 | sysdev_remove_file(&node->sysdev, &attr_cpumap); | |
39106dcf | 259 | sysdev_remove_file(&node->sysdev, &attr_cpulist); |
4b45099b KT |
260 | sysdev_remove_file(&node->sysdev, &attr_meminfo); |
261 | sysdev_remove_file(&node->sysdev, &attr_numastat); | |
262 | sysdev_remove_file(&node->sysdev, &attr_distance); | |
263 | ||
af936a16 | 264 | scan_unevictable_unregister_node(node); |
4faf8d95 | 265 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
af936a16 | 266 | |
4b45099b KT |
267 | sysdev_unregister(&node->sysdev); |
268 | } | |
1da177e4 | 269 | |
0fc44159 YG |
270 | struct node node_devices[MAX_NUMNODES]; |
271 | ||
76b67ed9 KH |
272 | /* |
273 | * register cpu under node | |
274 | */ | |
275 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
276 | { | |
1830794a | 277 | int ret; |
f8246f31 | 278 | struct sys_device *obj; |
76b67ed9 | 279 | |
f8246f31 AC |
280 | if (!node_online(nid)) |
281 | return 0; | |
282 | ||
283 | obj = get_cpu_sysdev(cpu); | |
284 | if (!obj) | |
285 | return 0; | |
286 | ||
1830794a | 287 | ret = sysfs_create_link(&node_devices[nid].sysdev.kobj, |
f8246f31 AC |
288 | &obj->kobj, |
289 | kobject_name(&obj->kobj)); | |
1830794a AC |
290 | if (ret) |
291 | return ret; | |
292 | ||
293 | return sysfs_create_link(&obj->kobj, | |
294 | &node_devices[nid].sysdev.kobj, | |
295 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
76b67ed9 KH |
296 | } |
297 | ||
298 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
299 | { | |
b9d52dad AC |
300 | struct sys_device *obj; |
301 | ||
302 | if (!node_online(nid)) | |
303 | return 0; | |
304 | ||
305 | obj = get_cpu_sysdev(cpu); | |
306 | if (!obj) | |
307 | return 0; | |
308 | ||
309 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
310 | kobject_name(&obj->kobj)); | |
1830794a AC |
311 | sysfs_remove_link(&obj->kobj, |
312 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
b9d52dad | 313 | |
76b67ed9 KH |
314 | return 0; |
315 | } | |
316 | ||
c04fc586 GH |
317 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
318 | #define page_initialized(page) (page->lru.next) | |
319 | ||
320 | static int get_nid_for_pfn(unsigned long pfn) | |
321 | { | |
322 | struct page *page; | |
323 | ||
324 | if (!pfn_valid_within(pfn)) | |
325 | return -1; | |
326 | page = pfn_to_page(pfn); | |
327 | if (!page_initialized(page)) | |
328 | return -1; | |
329 | return pfn_to_nid(pfn); | |
330 | } | |
331 | ||
332 | /* register memory section under specified node if it spans that node */ | |
333 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) | |
334 | { | |
dee5d0d5 | 335 | int ret; |
c04fc586 GH |
336 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
337 | ||
338 | if (!mem_blk) | |
339 | return -EFAULT; | |
340 | if (!node_online(nid)) | |
341 | return 0; | |
342 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); | |
343 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
344 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
345 | int page_nid; | |
346 | ||
347 | page_nid = get_nid_for_pfn(pfn); | |
348 | if (page_nid < 0) | |
349 | continue; | |
350 | if (page_nid != nid) | |
351 | continue; | |
dee5d0d5 | 352 | ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj, |
c04fc586 GH |
353 | &mem_blk->sysdev.kobj, |
354 | kobject_name(&mem_blk->sysdev.kobj)); | |
dee5d0d5 AC |
355 | if (ret) |
356 | return ret; | |
357 | ||
358 | return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj, | |
359 | &node_devices[nid].sysdev.kobj, | |
360 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
c04fc586 GH |
361 | } |
362 | /* mem section does not span the specified node */ | |
363 | return 0; | |
364 | } | |
365 | ||
366 | /* unregister memory section under all nodes that it spans */ | |
367 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) | |
368 | { | |
9ae49fab | 369 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
c04fc586 GH |
370 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
371 | ||
9ae49fab DR |
372 | if (!mem_blk) { |
373 | NODEMASK_FREE(unlinked_nodes); | |
c04fc586 | 374 | return -EFAULT; |
9ae49fab DR |
375 | } |
376 | if (!unlinked_nodes) | |
377 | return -ENOMEM; | |
378 | nodes_clear(*unlinked_nodes); | |
c04fc586 GH |
379 | sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); |
380 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; | |
381 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
47504980 | 382 | int nid; |
c04fc586 GH |
383 | |
384 | nid = get_nid_for_pfn(pfn); | |
385 | if (nid < 0) | |
386 | continue; | |
387 | if (!node_online(nid)) | |
388 | continue; | |
9ae49fab | 389 | if (node_test_and_set(nid, *unlinked_nodes)) |
c04fc586 GH |
390 | continue; |
391 | sysfs_remove_link(&node_devices[nid].sysdev.kobj, | |
392 | kobject_name(&mem_blk->sysdev.kobj)); | |
dee5d0d5 AC |
393 | sysfs_remove_link(&mem_blk->sysdev.kobj, |
394 | kobject_name(&node_devices[nid].sysdev.kobj)); | |
c04fc586 | 395 | } |
9ae49fab | 396 | NODEMASK_FREE(unlinked_nodes); |
c04fc586 GH |
397 | return 0; |
398 | } | |
399 | ||
400 | static int link_mem_sections(int nid) | |
401 | { | |
402 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; | |
403 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; | |
404 | unsigned long pfn; | |
405 | int err = 0; | |
406 | ||
407 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
408 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
409 | struct mem_section *mem_sect; | |
410 | struct memory_block *mem_blk; | |
411 | int ret; | |
412 | ||
413 | if (!present_section_nr(section_nr)) | |
414 | continue; | |
415 | mem_sect = __nr_to_section(section_nr); | |
416 | mem_blk = find_memory_block(mem_sect); | |
417 | ret = register_mem_sect_under_node(mem_blk, nid); | |
418 | if (!err) | |
419 | err = ret; | |
420 | ||
421 | /* discard ref obtained in find_memory_block() */ | |
422 | kobject_put(&mem_blk->sysdev.kobj); | |
423 | } | |
424 | return err; | |
425 | } | |
4faf8d95 | 426 | |
39da08cb | 427 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
428 | /* |
429 | * Handle per node hstate attribute [un]registration on transistions | |
430 | * to/from memoryless state. | |
431 | */ | |
39da08cb LS |
432 | static void node_hugetlb_work(struct work_struct *work) |
433 | { | |
434 | struct node *node = container_of(work, struct node, node_work); | |
435 | ||
436 | /* | |
437 | * We only get here when a node transitions to/from memoryless state. | |
438 | * We can detect which transition occurred by examining whether the | |
439 | * node has memory now. hugetlb_register_node() already check this | |
440 | * so we try to register the attributes. If that fails, then the | |
441 | * node has transitioned to memoryless, try to unregister the | |
442 | * attributes. | |
443 | */ | |
444 | if (!hugetlb_register_node(node)) | |
445 | hugetlb_unregister_node(node); | |
446 | } | |
447 | ||
448 | static void init_node_hugetlb_work(int nid) | |
449 | { | |
450 | INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); | |
451 | } | |
4faf8d95 LS |
452 | |
453 | static int node_memory_callback(struct notifier_block *self, | |
454 | unsigned long action, void *arg) | |
455 | { | |
456 | struct memory_notify *mnb = arg; | |
457 | int nid = mnb->status_change_nid; | |
458 | ||
459 | switch (action) { | |
39da08cb LS |
460 | case MEM_ONLINE: |
461 | case MEM_OFFLINE: | |
462 | /* | |
463 | * offload per node hstate [un]registration to a work thread | |
464 | * when transitioning to/from memoryless state. | |
465 | */ | |
4faf8d95 | 466 | if (nid != NUMA_NO_NODE) |
39da08cb | 467 | schedule_work(&node_devices[nid].node_work); |
4faf8d95 | 468 | break; |
39da08cb | 469 | |
4faf8d95 LS |
470 | case MEM_GOING_ONLINE: |
471 | case MEM_GOING_OFFLINE: | |
472 | case MEM_CANCEL_ONLINE: | |
473 | case MEM_CANCEL_OFFLINE: | |
474 | default: | |
475 | break; | |
476 | } | |
477 | ||
478 | return NOTIFY_OK; | |
479 | } | |
39da08cb LS |
480 | #endif /* CONFIG_HUGETLBFS */ |
481 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
482 | ||
c04fc586 | 483 | static int link_mem_sections(int nid) { return 0; } |
39da08cb | 484 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 485 | |
39da08cb LS |
486 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
487 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
488 | static inline int node_memory_callback(struct notifier_block *self, |
489 | unsigned long action, void *arg) | |
490 | { | |
491 | return NOTIFY_OK; | |
492 | } | |
39da08cb LS |
493 | |
494 | static void init_node_hugetlb_work(int nid) { } | |
495 | ||
496 | #endif | |
c04fc586 | 497 | |
0fc44159 YG |
498 | int register_one_node(int nid) |
499 | { | |
500 | int error = 0; | |
76b67ed9 | 501 | int cpu; |
0fc44159 YG |
502 | |
503 | if (node_online(nid)) { | |
504 | int p_node = parent_node(nid); | |
505 | struct node *parent = NULL; | |
506 | ||
507 | if (p_node != nid) | |
508 | parent = &node_devices[p_node]; | |
509 | ||
510 | error = register_node(&node_devices[nid], nid, parent); | |
76b67ed9 KH |
511 | |
512 | /* link cpu under this node */ | |
513 | for_each_present_cpu(cpu) { | |
514 | if (cpu_to_node(cpu) == nid) | |
515 | register_cpu_under_node(cpu, nid); | |
516 | } | |
c04fc586 GH |
517 | |
518 | /* link memory sections under this node */ | |
519 | error = link_mem_sections(nid); | |
39da08cb LS |
520 | |
521 | /* initialize work queue for memory hot plug */ | |
522 | init_node_hugetlb_work(nid); | |
0fc44159 YG |
523 | } |
524 | ||
525 | return error; | |
526 | ||
527 | } | |
528 | ||
529 | void unregister_one_node(int nid) | |
530 | { | |
531 | unregister_node(&node_devices[nid]); | |
532 | } | |
533 | ||
bde631a5 LS |
534 | /* |
535 | * node states attributes | |
536 | */ | |
537 | ||
538 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
539 | { | |
540 | int n; | |
541 | ||
542 | n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]); | |
543 | if (n > 0 && PAGE_SIZE > n + 1) { | |
544 | *(buf + n++) = '\n'; | |
545 | *(buf + n++) = '\0'; | |
546 | } | |
547 | return n; | |
548 | } | |
549 | ||
b15f562f AK |
550 | struct node_attr { |
551 | struct sysdev_class_attribute attr; | |
552 | enum node_states state; | |
553 | }; | |
bde631a5 | 554 | |
b15f562f AK |
555 | static ssize_t show_node_state(struct sysdev_class *class, |
556 | struct sysdev_class_attribute *attr, char *buf) | |
bde631a5 | 557 | { |
b15f562f AK |
558 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
559 | return print_nodes_state(na->state, buf); | |
bde631a5 LS |
560 | } |
561 | ||
b15f562f AK |
562 | #define _NODE_ATTR(name, state) \ |
563 | { _SYSDEV_CLASS_ATTR(name, 0444, show_node_state, NULL), state } | |
bde631a5 | 564 | |
b15f562f AK |
565 | static struct node_attr node_state_attr[] = { |
566 | _NODE_ATTR(possible, N_POSSIBLE), | |
567 | _NODE_ATTR(online, N_ONLINE), | |
568 | _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), | |
569 | _NODE_ATTR(has_cpu, N_CPU), | |
bde631a5 | 570 | #ifdef CONFIG_HIGHMEM |
b15f562f | 571 | _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
bde631a5 | 572 | #endif |
bde631a5 LS |
573 | }; |
574 | ||
3701cde6 AK |
575 | static struct sysdev_class_attribute *node_state_attrs[] = { |
576 | &node_state_attr[0].attr, | |
577 | &node_state_attr[1].attr, | |
578 | &node_state_attr[2].attr, | |
579 | &node_state_attr[3].attr, | |
580 | #ifdef CONFIG_HIGHMEM | |
581 | &node_state_attr[4].attr, | |
582 | #endif | |
583 | NULL | |
584 | }; | |
bde631a5 | 585 | |
4faf8d95 | 586 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 587 | static int __init register_node_type(void) |
1da177e4 | 588 | { |
bde631a5 LS |
589 | int ret; |
590 | ||
3701cde6 AK |
591 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
592 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); | |
593 | ||
bde631a5 | 594 | ret = sysdev_class_register(&node_class); |
4faf8d95 | 595 | if (!ret) { |
4faf8d95 LS |
596 | hotplug_memory_notifier(node_memory_callback, |
597 | NODE_CALLBACK_PRI); | |
598 | } | |
bde631a5 LS |
599 | |
600 | /* | |
601 | * Note: we're not going to unregister the node class if we fail | |
602 | * to register the node state class attribute files. | |
603 | */ | |
604 | return ret; | |
1da177e4 LT |
605 | } |
606 | postcore_initcall(register_node_type); |