Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
10fbcf4c | 2 | * Basic Node interface support |
1da177e4 LT |
3 | */ |
4 | ||
1da177e4 LT |
5 | #include <linux/module.h> |
6 | #include <linux/init.h> | |
7 | #include <linux/mm.h> | |
c04fc586 | 8 | #include <linux/memory.h> |
fa25c503 | 9 | #include <linux/vmstat.h> |
6e259e7d | 10 | #include <linux/notifier.h> |
1da177e4 LT |
11 | #include <linux/node.h> |
12 | #include <linux/hugetlb.h> | |
ed4a6d7f | 13 | #include <linux/compaction.h> |
1da177e4 LT |
14 | #include <linux/cpumask.h> |
15 | #include <linux/topology.h> | |
16 | #include <linux/nodemask.h> | |
76b67ed9 | 17 | #include <linux/cpu.h> |
bde631a5 | 18 | #include <linux/device.h> |
af936a16 | 19 | #include <linux/swap.h> |
18e5b539 | 20 | #include <linux/slab.h> |
1da177e4 | 21 | |
10fbcf4c | 22 | static struct bus_type node_subsys = { |
af5ca3f4 | 23 | .name = "node", |
10fbcf4c | 24 | .dev_name = "node", |
1da177e4 LT |
25 | }; |
26 | ||
27 | ||
5aaba363 | 28 | static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf) |
1da177e4 LT |
29 | { |
30 | struct node *node_dev = to_node(dev); | |
10fbcf4c | 31 | const struct cpumask *mask = cpumask_of_node(node_dev->dev.id); |
1da177e4 | 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 | |
5aaba363 | 36 | return cpumap_print_to_pagebuf(list, buf, mask); |
1da177e4 LT |
37 | } |
38 | ||
10fbcf4c KS |
39 | static inline ssize_t node_read_cpumask(struct device *dev, |
40 | struct device_attribute *attr, char *buf) | |
39106dcf | 41 | { |
5aaba363 | 42 | return node_read_cpumap(dev, false, buf); |
39106dcf | 43 | } |
10fbcf4c KS |
44 | static inline ssize_t node_read_cpulist(struct device *dev, |
45 | struct device_attribute *attr, char *buf) | |
39106dcf | 46 | { |
5aaba363 | 47 | return node_read_cpumap(dev, true, buf); |
39106dcf MT |
48 | } |
49 | ||
10fbcf4c KS |
50 | static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); |
51 | static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); | |
1da177e4 LT |
52 | |
53 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
10fbcf4c KS |
54 | static ssize_t node_read_meminfo(struct device *dev, |
55 | struct device_attribute *attr, char *buf) | |
1da177e4 LT |
56 | { |
57 | int n; | |
58 | int nid = dev->id; | |
59 | struct sysinfo i; | |
1da177e4 LT |
60 | |
61 | si_meminfo_node(&i, nid); | |
7ee92255 | 62 | n = sprintf(buf, |
4f98a2fe RR |
63 | "Node %d MemTotal: %8lu kB\n" |
64 | "Node %d MemFree: %8lu kB\n" | |
65 | "Node %d MemUsed: %8lu kB\n" | |
66 | "Node %d Active: %8lu kB\n" | |
67 | "Node %d Inactive: %8lu kB\n" | |
68 | "Node %d Active(anon): %8lu kB\n" | |
69 | "Node %d Inactive(anon): %8lu kB\n" | |
70 | "Node %d Active(file): %8lu kB\n" | |
71 | "Node %d Inactive(file): %8lu kB\n" | |
5344b7e6 | 72 | "Node %d Unevictable: %8lu kB\n" |
7ee92255 KM |
73 | "Node %d Mlocked: %8lu kB\n", |
74 | nid, K(i.totalram), | |
75 | nid, K(i.freeram), | |
76 | nid, K(i.totalram - i.freeram), | |
77 | nid, K(node_page_state(nid, NR_ACTIVE_ANON) + | |
78 | node_page_state(nid, NR_ACTIVE_FILE)), | |
79 | nid, K(node_page_state(nid, NR_INACTIVE_ANON) + | |
80 | node_page_state(nid, NR_INACTIVE_FILE)), | |
81 | nid, K(node_page_state(nid, NR_ACTIVE_ANON)), | |
82 | nid, K(node_page_state(nid, NR_INACTIVE_ANON)), | |
83 | nid, K(node_page_state(nid, NR_ACTIVE_FILE)), | |
84 | nid, K(node_page_state(nid, NR_INACTIVE_FILE)), | |
85 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), | |
86 | nid, K(node_page_state(nid, NR_MLOCK))); | |
87 | ||
182e8e23 | 88 | #ifdef CONFIG_HIGHMEM |
7ee92255 | 89 | n += sprintf(buf + n, |
4f98a2fe RR |
90 | "Node %d HighTotal: %8lu kB\n" |
91 | "Node %d HighFree: %8lu kB\n" | |
92 | "Node %d LowTotal: %8lu kB\n" | |
7ee92255 KM |
93 | "Node %d LowFree: %8lu kB\n", |
94 | nid, K(i.totalhigh), | |
95 | nid, K(i.freehigh), | |
96 | nid, K(i.totalram - i.totalhigh), | |
97 | nid, K(i.freeram - i.freehigh)); | |
182e8e23 | 98 | #endif |
7ee92255 | 99 | n += sprintf(buf + n, |
4f98a2fe RR |
100 | "Node %d Dirty: %8lu kB\n" |
101 | "Node %d Writeback: %8lu kB\n" | |
102 | "Node %d FilePages: %8lu kB\n" | |
103 | "Node %d Mapped: %8lu kB\n" | |
104 | "Node %d AnonPages: %8lu kB\n" | |
4b02108a | 105 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 106 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
107 | "Node %d PageTables: %8lu kB\n" |
108 | "Node %d NFS_Unstable: %8lu kB\n" | |
109 | "Node %d Bounce: %8lu kB\n" | |
110 | "Node %d WritebackTmp: %8lu kB\n" | |
111 | "Node %d Slab: %8lu kB\n" | |
112 | "Node %d SReclaimable: %8lu kB\n" | |
05b258e9 DR |
113 | "Node %d SUnreclaim: %8lu kB\n" |
114 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
115 | "Node %d AnonHugePages: %8lu kB\n" | |
116 | #endif | |
117 | , | |
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)), |
91a13c28 | 122 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
cc7452b6 | 123 | nid, K(i.sharedram), |
c6a7f572 KM |
124 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
125 | THREAD_SIZE / 1024, | |
df849a15 | 126 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
fd39fc85 | 127 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
d2c5e30c | 128 | nid, K(node_page_state(nid, NR_BOUNCE)), |
fc3ba692 | 129 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
972d1a7b CL |
130 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
131 | node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), | |
132 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), | |
05b258e9 | 133 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
91a13c28 | 134 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)) |
05b258e9 DR |
135 | , nid, |
136 | K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * | |
91a13c28 CS |
137 | HPAGE_PMD_NR)); |
138 | #else | |
139 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); | |
05b258e9 | 140 | #endif |
1da177e4 LT |
141 | n += hugetlb_report_node_meminfo(nid, buf + n); |
142 | return n; | |
143 | } | |
144 | ||
145 | #undef K | |
10fbcf4c | 146 | static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); |
1da177e4 | 147 | |
10fbcf4c KS |
148 | static ssize_t node_read_numastat(struct device *dev, |
149 | struct device_attribute *attr, char *buf) | |
1da177e4 | 150 | { |
1da177e4 LT |
151 | return sprintf(buf, |
152 | "numa_hit %lu\n" | |
153 | "numa_miss %lu\n" | |
154 | "numa_foreign %lu\n" | |
155 | "interleave_hit %lu\n" | |
156 | "local_node %lu\n" | |
157 | "other_node %lu\n", | |
ca889e6c CL |
158 | node_page_state(dev->id, NUMA_HIT), |
159 | node_page_state(dev->id, NUMA_MISS), | |
160 | node_page_state(dev->id, NUMA_FOREIGN), | |
161 | node_page_state(dev->id, NUMA_INTERLEAVE_HIT), | |
162 | node_page_state(dev->id, NUMA_LOCAL), | |
163 | node_page_state(dev->id, NUMA_OTHER)); | |
1da177e4 | 164 | } |
10fbcf4c | 165 | static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); |
1da177e4 | 166 | |
10fbcf4c KS |
167 | static ssize_t node_read_vmstat(struct device *dev, |
168 | struct device_attribute *attr, char *buf) | |
2ac39037 MR |
169 | { |
170 | int nid = dev->id; | |
fa25c503 KM |
171 | int i; |
172 | int n = 0; | |
173 | ||
174 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
175 | n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], | |
176 | node_page_state(nid, i)); | |
177 | ||
178 | return n; | |
2ac39037 | 179 | } |
10fbcf4c | 180 | static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); |
2ac39037 | 181 | |
10fbcf4c | 182 | static ssize_t node_read_distance(struct device *dev, |
518d3f38 | 183 | struct device_attribute *attr, char *buf) |
1da177e4 LT |
184 | { |
185 | int nid = dev->id; | |
186 | int len = 0; | |
187 | int i; | |
188 | ||
12ee3c0a DR |
189 | /* |
190 | * buf is currently PAGE_SIZE in length and each node needs 4 chars | |
191 | * at the most (distance + space or newline). | |
192 | */ | |
193 | BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); | |
1da177e4 LT |
194 | |
195 | for_each_online_node(i) | |
196 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
197 | ||
198 | len += sprintf(buf + len, "\n"); | |
199 | return len; | |
200 | } | |
10fbcf4c | 201 | static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); |
1da177e4 | 202 | |
3c9b8aaf TI |
203 | static struct attribute *node_dev_attrs[] = { |
204 | &dev_attr_cpumap.attr, | |
205 | &dev_attr_cpulist.attr, | |
206 | &dev_attr_meminfo.attr, | |
207 | &dev_attr_numastat.attr, | |
208 | &dev_attr_distance.attr, | |
209 | &dev_attr_vmstat.attr, | |
210 | NULL | |
211 | }; | |
7ca7ec40 | 212 | ATTRIBUTE_GROUPS(node_dev); |
3c9b8aaf | 213 | |
9a305230 LS |
214 | #ifdef CONFIG_HUGETLBFS |
215 | /* | |
216 | * hugetlbfs per node attributes registration interface: | |
217 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
218 | * it will register its per node attributes for all online nodes with |
219 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
220 | * register its attribute registration functions with this node driver. |
221 | * Once these hooks have been initialized, the node driver will call into | |
222 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
223 | */ | |
224 | static node_registration_func_t __hugetlb_register_node; | |
225 | static node_registration_func_t __hugetlb_unregister_node; | |
226 | ||
39da08cb | 227 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 228 | { |
4faf8d95 | 229 | if (__hugetlb_register_node && |
8cebfcd0 | 230 | node_state(node->dev.id, N_MEMORY)) { |
9a305230 | 231 | __hugetlb_register_node(node); |
39da08cb LS |
232 | return true; |
233 | } | |
234 | return false; | |
9a305230 LS |
235 | } |
236 | ||
237 | static inline void hugetlb_unregister_node(struct node *node) | |
238 | { | |
239 | if (__hugetlb_unregister_node) | |
240 | __hugetlb_unregister_node(node); | |
241 | } | |
242 | ||
243 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
244 | node_registration_func_t unregister) | |
245 | { | |
246 | __hugetlb_register_node = doregister; | |
247 | __hugetlb_unregister_node = unregister; | |
248 | } | |
249 | #else | |
250 | static inline void hugetlb_register_node(struct node *node) {} | |
251 | ||
252 | static inline void hugetlb_unregister_node(struct node *node) {} | |
253 | #endif | |
254 | ||
8c7b5b4e YI |
255 | static void node_device_release(struct device *dev) |
256 | { | |
257 | struct node *node = to_node(dev); | |
258 | ||
259 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) | |
260 | /* | |
261 | * We schedule the work only when a memory section is | |
262 | * onlined/offlined on this node. When we come here, | |
263 | * all the memory on this node has been offlined, | |
264 | * so we won't enqueue new work to this work. | |
265 | * | |
266 | * The work is using node->node_work, so we should | |
267 | * flush work before freeing the memory. | |
268 | */ | |
269 | flush_work(&node->node_work); | |
270 | #endif | |
271 | kfree(node); | |
272 | } | |
1da177e4 LT |
273 | |
274 | /* | |
405ae7d3 | 275 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
276 | * @num - Node number to use when creating the device. |
277 | * | |
278 | * Initialize and register the node device. | |
279 | */ | |
fa264375 | 280 | static int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
281 | { |
282 | int error; | |
283 | ||
10fbcf4c KS |
284 | node->dev.id = num; |
285 | node->dev.bus = &node_subsys; | |
8c7b5b4e | 286 | node->dev.release = node_device_release; |
7ca7ec40 | 287 | node->dev.groups = node_dev_groups; |
10fbcf4c | 288 | error = device_register(&node->dev); |
1da177e4 LT |
289 | |
290 | if (!error){ | |
9a305230 | 291 | hugetlb_register_node(node); |
ed4a6d7f MG |
292 | |
293 | compaction_register_node(node); | |
1da177e4 LT |
294 | } |
295 | return error; | |
296 | } | |
297 | ||
4b45099b KT |
298 | /** |
299 | * unregister_node - unregister a node device | |
300 | * @node: node going away | |
301 | * | |
302 | * Unregisters a node device @node. All the devices on the node must be | |
303 | * unregistered before calling this function. | |
304 | */ | |
305 | void unregister_node(struct node *node) | |
306 | { | |
4faf8d95 | 307 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
af936a16 | 308 | |
10fbcf4c | 309 | device_unregister(&node->dev); |
4b45099b | 310 | } |
1da177e4 | 311 | |
8732794b | 312 | struct node *node_devices[MAX_NUMNODES]; |
0fc44159 | 313 | |
76b67ed9 KH |
314 | /* |
315 | * register cpu under node | |
316 | */ | |
317 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
318 | { | |
1830794a | 319 | int ret; |
8a25a2fd | 320 | struct device *obj; |
76b67ed9 | 321 | |
f8246f31 AC |
322 | if (!node_online(nid)) |
323 | return 0; | |
324 | ||
8a25a2fd | 325 | obj = get_cpu_device(cpu); |
f8246f31 AC |
326 | if (!obj) |
327 | return 0; | |
328 | ||
8732794b | 329 | ret = sysfs_create_link(&node_devices[nid]->dev.kobj, |
f8246f31 AC |
330 | &obj->kobj, |
331 | kobject_name(&obj->kobj)); | |
1830794a AC |
332 | if (ret) |
333 | return ret; | |
334 | ||
335 | return sysfs_create_link(&obj->kobj, | |
8732794b WC |
336 | &node_devices[nid]->dev.kobj, |
337 | kobject_name(&node_devices[nid]->dev.kobj)); | |
76b67ed9 KH |
338 | } |
339 | ||
340 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
341 | { | |
8a25a2fd | 342 | struct device *obj; |
b9d52dad AC |
343 | |
344 | if (!node_online(nid)) | |
345 | return 0; | |
346 | ||
8a25a2fd | 347 | obj = get_cpu_device(cpu); |
b9d52dad AC |
348 | if (!obj) |
349 | return 0; | |
350 | ||
8732794b | 351 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
b9d52dad | 352 | kobject_name(&obj->kobj)); |
1830794a | 353 | sysfs_remove_link(&obj->kobj, |
8732794b | 354 | kobject_name(&node_devices[nid]->dev.kobj)); |
b9d52dad | 355 | |
76b67ed9 KH |
356 | return 0; |
357 | } | |
358 | ||
c04fc586 GH |
359 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
360 | #define page_initialized(page) (page->lru.next) | |
361 | ||
362 | static int get_nid_for_pfn(unsigned long pfn) | |
363 | { | |
364 | struct page *page; | |
365 | ||
366 | if (!pfn_valid_within(pfn)) | |
367 | return -1; | |
368 | page = pfn_to_page(pfn); | |
369 | if (!page_initialized(page)) | |
370 | return -1; | |
371 | return pfn_to_nid(pfn); | |
372 | } | |
373 | ||
374 | /* register memory section under specified node if it spans that node */ | |
375 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) | |
376 | { | |
dee5d0d5 | 377 | int ret; |
c04fc586 GH |
378 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
379 | ||
380 | if (!mem_blk) | |
381 | return -EFAULT; | |
382 | if (!node_online(nid)) | |
383 | return 0; | |
d3360164 NF |
384 | |
385 | sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); | |
386 | sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); | |
387 | sect_end_pfn += PAGES_PER_SECTION - 1; | |
c04fc586 GH |
388 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { |
389 | int page_nid; | |
390 | ||
391 | page_nid = get_nid_for_pfn(pfn); | |
392 | if (page_nid < 0) | |
393 | continue; | |
394 | if (page_nid != nid) | |
395 | continue; | |
8732794b | 396 | ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, |
10fbcf4c KS |
397 | &mem_blk->dev.kobj, |
398 | kobject_name(&mem_blk->dev.kobj)); | |
dee5d0d5 AC |
399 | if (ret) |
400 | return ret; | |
401 | ||
10fbcf4c | 402 | return sysfs_create_link_nowarn(&mem_blk->dev.kobj, |
8732794b WC |
403 | &node_devices[nid]->dev.kobj, |
404 | kobject_name(&node_devices[nid]->dev.kobj)); | |
c04fc586 GH |
405 | } |
406 | /* mem section does not span the specified node */ | |
407 | return 0; | |
408 | } | |
409 | ||
410 | /* unregister memory section under all nodes that it spans */ | |
d3360164 NF |
411 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, |
412 | unsigned long phys_index) | |
c04fc586 | 413 | { |
9ae49fab | 414 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
c04fc586 GH |
415 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
416 | ||
9ae49fab DR |
417 | if (!mem_blk) { |
418 | NODEMASK_FREE(unlinked_nodes); | |
c04fc586 | 419 | return -EFAULT; |
9ae49fab DR |
420 | } |
421 | if (!unlinked_nodes) | |
422 | return -ENOMEM; | |
423 | nodes_clear(*unlinked_nodes); | |
d3360164 NF |
424 | |
425 | sect_start_pfn = section_nr_to_pfn(phys_index); | |
c04fc586 GH |
426 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; |
427 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
47504980 | 428 | int nid; |
c04fc586 GH |
429 | |
430 | nid = get_nid_for_pfn(pfn); | |
431 | if (nid < 0) | |
432 | continue; | |
433 | if (!node_online(nid)) | |
434 | continue; | |
9ae49fab | 435 | if (node_test_and_set(nid, *unlinked_nodes)) |
c04fc586 | 436 | continue; |
8732794b | 437 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
10fbcf4c KS |
438 | kobject_name(&mem_blk->dev.kobj)); |
439 | sysfs_remove_link(&mem_blk->dev.kobj, | |
8732794b | 440 | kobject_name(&node_devices[nid]->dev.kobj)); |
c04fc586 | 441 | } |
9ae49fab | 442 | NODEMASK_FREE(unlinked_nodes); |
c04fc586 GH |
443 | return 0; |
444 | } | |
445 | ||
446 | static int link_mem_sections(int nid) | |
447 | { | |
448 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; | |
449 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; | |
450 | unsigned long pfn; | |
63d027a6 | 451 | struct memory_block *mem_blk = NULL; |
c04fc586 GH |
452 | int err = 0; |
453 | ||
454 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
455 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
456 | struct mem_section *mem_sect; | |
c04fc586 GH |
457 | int ret; |
458 | ||
459 | if (!present_section_nr(section_nr)) | |
460 | continue; | |
461 | mem_sect = __nr_to_section(section_nr); | |
321bf4ed YL |
462 | |
463 | /* same memblock ? */ | |
464 | if (mem_blk) | |
465 | if ((section_nr >= mem_blk->start_section_nr) && | |
466 | (section_nr <= mem_blk->end_section_nr)) | |
467 | continue; | |
468 | ||
63d027a6 | 469 | mem_blk = find_memory_block_hinted(mem_sect, mem_blk); |
321bf4ed | 470 | |
c04fc586 GH |
471 | ret = register_mem_sect_under_node(mem_blk, nid); |
472 | if (!err) | |
473 | err = ret; | |
474 | ||
475 | /* discard ref obtained in find_memory_block() */ | |
c04fc586 | 476 | } |
63d027a6 RH |
477 | |
478 | if (mem_blk) | |
10fbcf4c | 479 | kobject_put(&mem_blk->dev.kobj); |
c04fc586 GH |
480 | return err; |
481 | } | |
4faf8d95 | 482 | |
39da08cb | 483 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
484 | /* |
485 | * Handle per node hstate attribute [un]registration on transistions | |
486 | * to/from memoryless state. | |
487 | */ | |
39da08cb LS |
488 | static void node_hugetlb_work(struct work_struct *work) |
489 | { | |
490 | struct node *node = container_of(work, struct node, node_work); | |
491 | ||
492 | /* | |
493 | * We only get here when a node transitions to/from memoryless state. | |
494 | * We can detect which transition occurred by examining whether the | |
495 | * node has memory now. hugetlb_register_node() already check this | |
496 | * so we try to register the attributes. If that fails, then the | |
497 | * node has transitioned to memoryless, try to unregister the | |
498 | * attributes. | |
499 | */ | |
500 | if (!hugetlb_register_node(node)) | |
501 | hugetlb_unregister_node(node); | |
502 | } | |
503 | ||
504 | static void init_node_hugetlb_work(int nid) | |
505 | { | |
8732794b | 506 | INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); |
39da08cb | 507 | } |
4faf8d95 LS |
508 | |
509 | static int node_memory_callback(struct notifier_block *self, | |
510 | unsigned long action, void *arg) | |
511 | { | |
512 | struct memory_notify *mnb = arg; | |
513 | int nid = mnb->status_change_nid; | |
514 | ||
515 | switch (action) { | |
39da08cb LS |
516 | case MEM_ONLINE: |
517 | case MEM_OFFLINE: | |
518 | /* | |
519 | * offload per node hstate [un]registration to a work thread | |
520 | * when transitioning to/from memoryless state. | |
521 | */ | |
4faf8d95 | 522 | if (nid != NUMA_NO_NODE) |
8732794b | 523 | schedule_work(&node_devices[nid]->node_work); |
4faf8d95 | 524 | break; |
39da08cb | 525 | |
4faf8d95 LS |
526 | case MEM_GOING_ONLINE: |
527 | case MEM_GOING_OFFLINE: | |
528 | case MEM_CANCEL_ONLINE: | |
529 | case MEM_CANCEL_OFFLINE: | |
530 | default: | |
531 | break; | |
532 | } | |
533 | ||
534 | return NOTIFY_OK; | |
535 | } | |
39da08cb LS |
536 | #endif /* CONFIG_HUGETLBFS */ |
537 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
538 | ||
c04fc586 | 539 | static int link_mem_sections(int nid) { return 0; } |
39da08cb | 540 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 541 | |
39da08cb LS |
542 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
543 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
544 | static inline int node_memory_callback(struct notifier_block *self, |
545 | unsigned long action, void *arg) | |
546 | { | |
547 | return NOTIFY_OK; | |
548 | } | |
39da08cb LS |
549 | |
550 | static void init_node_hugetlb_work(int nid) { } | |
551 | ||
552 | #endif | |
c04fc586 | 553 | |
0fc44159 YG |
554 | int register_one_node(int nid) |
555 | { | |
556 | int error = 0; | |
76b67ed9 | 557 | int cpu; |
0fc44159 YG |
558 | |
559 | if (node_online(nid)) { | |
560 | int p_node = parent_node(nid); | |
561 | struct node *parent = NULL; | |
562 | ||
563 | if (p_node != nid) | |
8732794b | 564 | parent = node_devices[p_node]; |
0fc44159 | 565 | |
8732794b WC |
566 | node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); |
567 | if (!node_devices[nid]) | |
568 | return -ENOMEM; | |
569 | ||
570 | error = register_node(node_devices[nid], nid, parent); | |
76b67ed9 KH |
571 | |
572 | /* link cpu under this node */ | |
573 | for_each_present_cpu(cpu) { | |
574 | if (cpu_to_node(cpu) == nid) | |
575 | register_cpu_under_node(cpu, nid); | |
576 | } | |
c04fc586 GH |
577 | |
578 | /* link memory sections under this node */ | |
579 | error = link_mem_sections(nid); | |
39da08cb LS |
580 | |
581 | /* initialize work queue for memory hot plug */ | |
582 | init_node_hugetlb_work(nid); | |
0fc44159 YG |
583 | } |
584 | ||
585 | return error; | |
586 | ||
587 | } | |
588 | ||
589 | void unregister_one_node(int nid) | |
590 | { | |
92d585ef XQ |
591 | if (!node_devices[nid]) |
592 | return; | |
593 | ||
8732794b | 594 | unregister_node(node_devices[nid]); |
8732794b | 595 | node_devices[nid] = NULL; |
0fc44159 YG |
596 | } |
597 | ||
bde631a5 LS |
598 | /* |
599 | * node states attributes | |
600 | */ | |
601 | ||
602 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
603 | { | |
604 | int n; | |
605 | ||
f799b1a7 TH |
606 | n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", |
607 | nodemask_pr_args(&node_states[state])); | |
f6238818 RO |
608 | buf[n++] = '\n'; |
609 | buf[n] = '\0'; | |
bde631a5 LS |
610 | return n; |
611 | } | |
612 | ||
b15f562f | 613 | struct node_attr { |
10fbcf4c | 614 | struct device_attribute attr; |
b15f562f AK |
615 | enum node_states state; |
616 | }; | |
bde631a5 | 617 | |
10fbcf4c KS |
618 | static ssize_t show_node_state(struct device *dev, |
619 | struct device_attribute *attr, char *buf) | |
bde631a5 | 620 | { |
b15f562f AK |
621 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
622 | return print_nodes_state(na->state, buf); | |
bde631a5 LS |
623 | } |
624 | ||
b15f562f | 625 | #define _NODE_ATTR(name, state) \ |
10fbcf4c | 626 | { __ATTR(name, 0444, show_node_state, NULL), state } |
bde631a5 | 627 | |
b15f562f | 628 | static struct node_attr node_state_attr[] = { |
fcf07d22 LJ |
629 | [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), |
630 | [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), | |
631 | [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), | |
bde631a5 | 632 | #ifdef CONFIG_HIGHMEM |
fcf07d22 | 633 | [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
20b2f52b LJ |
634 | #endif |
635 | #ifdef CONFIG_MOVABLE_NODE | |
636 | [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), | |
bde631a5 | 637 | #endif |
fcf07d22 | 638 | [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), |
bde631a5 LS |
639 | }; |
640 | ||
10fbcf4c | 641 | static struct attribute *node_state_attrs[] = { |
fcf07d22 LJ |
642 | &node_state_attr[N_POSSIBLE].attr.attr, |
643 | &node_state_attr[N_ONLINE].attr.attr, | |
644 | &node_state_attr[N_NORMAL_MEMORY].attr.attr, | |
3701cde6 | 645 | #ifdef CONFIG_HIGHMEM |
fcf07d22 | 646 | &node_state_attr[N_HIGH_MEMORY].attr.attr, |
20b2f52b LJ |
647 | #endif |
648 | #ifdef CONFIG_MOVABLE_NODE | |
649 | &node_state_attr[N_MEMORY].attr.attr, | |
3701cde6 | 650 | #endif |
fcf07d22 | 651 | &node_state_attr[N_CPU].attr.attr, |
3701cde6 AK |
652 | NULL |
653 | }; | |
bde631a5 | 654 | |
10fbcf4c KS |
655 | static struct attribute_group memory_root_attr_group = { |
656 | .attrs = node_state_attrs, | |
657 | }; | |
658 | ||
659 | static const struct attribute_group *cpu_root_attr_groups[] = { | |
660 | &memory_root_attr_group, | |
661 | NULL, | |
662 | }; | |
663 | ||
4faf8d95 | 664 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 665 | static int __init register_node_type(void) |
1da177e4 | 666 | { |
bde631a5 LS |
667 | int ret; |
668 | ||
3701cde6 AK |
669 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
670 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); | |
671 | ||
10fbcf4c | 672 | ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); |
4faf8d95 | 673 | if (!ret) { |
6e259e7d AM |
674 | static struct notifier_block node_memory_callback_nb = { |
675 | .notifier_call = node_memory_callback, | |
676 | .priority = NODE_CALLBACK_PRI, | |
677 | }; | |
678 | register_hotmemory_notifier(&node_memory_callback_nb); | |
4faf8d95 | 679 | } |
bde631a5 LS |
680 | |
681 | /* | |
682 | * Note: we're not going to unregister the node class if we fail | |
683 | * to register the node state class attribute files. | |
684 | */ | |
685 | return ret; | |
1da177e4 LT |
686 | } |
687 | postcore_initcall(register_node_type); |