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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; | |
599d0c95 | 59 | struct pglist_data *pgdat = NODE_DATA(nid); |
1da177e4 | 60 | struct sysinfo i; |
1da177e4 LT |
61 | |
62 | si_meminfo_node(&i, nid); | |
7ee92255 | 63 | n = sprintf(buf, |
4f98a2fe RR |
64 | "Node %d MemTotal: %8lu kB\n" |
65 | "Node %d MemFree: %8lu kB\n" | |
66 | "Node %d MemUsed: %8lu kB\n" | |
67 | "Node %d Active: %8lu kB\n" | |
68 | "Node %d Inactive: %8lu kB\n" | |
69 | "Node %d Active(anon): %8lu kB\n" | |
70 | "Node %d Inactive(anon): %8lu kB\n" | |
71 | "Node %d Active(file): %8lu kB\n" | |
72 | "Node %d Inactive(file): %8lu kB\n" | |
5344b7e6 | 73 | "Node %d Unevictable: %8lu kB\n" |
7ee92255 KM |
74 | "Node %d Mlocked: %8lu kB\n", |
75 | nid, K(i.totalram), | |
76 | nid, K(i.freeram), | |
77 | nid, K(i.totalram - i.freeram), | |
599d0c95 MG |
78 | nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + |
79 | node_page_state(pgdat, NR_ACTIVE_FILE)), | |
80 | nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + | |
81 | node_page_state(pgdat, NR_INACTIVE_FILE)), | |
82 | nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), | |
83 | nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), | |
84 | nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), | |
85 | nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), | |
86 | nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), | |
75ef7184 | 87 | nid, K(sum_zone_node_page_state(nid, NR_MLOCK))); |
7ee92255 | 88 | |
182e8e23 | 89 | #ifdef CONFIG_HIGHMEM |
7ee92255 | 90 | n += sprintf(buf + n, |
4f98a2fe RR |
91 | "Node %d HighTotal: %8lu kB\n" |
92 | "Node %d HighFree: %8lu kB\n" | |
93 | "Node %d LowTotal: %8lu kB\n" | |
7ee92255 KM |
94 | "Node %d LowFree: %8lu kB\n", |
95 | nid, K(i.totalhigh), | |
96 | nid, K(i.freehigh), | |
97 | nid, K(i.totalram - i.totalhigh), | |
98 | nid, K(i.freeram - i.freehigh)); | |
182e8e23 | 99 | #endif |
7ee92255 | 100 | n += sprintf(buf + n, |
4f98a2fe RR |
101 | "Node %d Dirty: %8lu kB\n" |
102 | "Node %d Writeback: %8lu kB\n" | |
103 | "Node %d FilePages: %8lu kB\n" | |
104 | "Node %d Mapped: %8lu kB\n" | |
105 | "Node %d AnonPages: %8lu kB\n" | |
4b02108a | 106 | "Node %d Shmem: %8lu kB\n" |
c6a7f572 | 107 | "Node %d KernelStack: %8lu kB\n" |
4f98a2fe RR |
108 | "Node %d PageTables: %8lu kB\n" |
109 | "Node %d NFS_Unstable: %8lu kB\n" | |
110 | "Node %d Bounce: %8lu kB\n" | |
111 | "Node %d WritebackTmp: %8lu kB\n" | |
112 | "Node %d Slab: %8lu kB\n" | |
113 | "Node %d SReclaimable: %8lu kB\n" | |
05b258e9 DR |
114 | "Node %d SUnreclaim: %8lu kB\n" |
115 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
116 | "Node %d AnonHugePages: %8lu kB\n" | |
65c45377 KS |
117 | "Node %d ShmemHugePages: %8lu kB\n" |
118 | "Node %d ShmemPmdMapped: %8lu kB\n" | |
05b258e9 DR |
119 | #endif |
120 | , | |
11fb9989 MG |
121 | nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), |
122 | nid, K(node_page_state(pgdat, NR_WRITEBACK)), | |
123 | nid, K(node_page_state(pgdat, NR_FILE_PAGES)), | |
50658e2e | 124 | nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), |
4b9d0fab | 125 | nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), |
cc7452b6 | 126 | nid, K(i.sharedram), |
75ef7184 | 127 | nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) * |
c6a7f572 | 128 | THREAD_SIZE / 1024, |
75ef7184 | 129 | nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)), |
11fb9989 | 130 | nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)), |
75ef7184 | 131 | nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)), |
11fb9989 | 132 | nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), |
75ef7184 MG |
133 | nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
134 | sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), | |
135 | nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE)), | |
05b258e9 | 136 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
75ef7184 | 137 | nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), |
11fb9989 | 138 | nid, K(node_page_state(pgdat, NR_ANON_THPS) * |
65c45377 | 139 | HPAGE_PMD_NR), |
11fb9989 | 140 | nid, K(node_page_state(pgdat, NR_SHMEM_THPS) * |
65c45377 | 141 | HPAGE_PMD_NR), |
11fb9989 | 142 | nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED) * |
65c45377 | 143 | HPAGE_PMD_NR)); |
91a13c28 | 144 | #else |
75ef7184 | 145 | nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); |
05b258e9 | 146 | #endif |
1da177e4 LT |
147 | n += hugetlb_report_node_meminfo(nid, buf + n); |
148 | return n; | |
149 | } | |
150 | ||
151 | #undef K | |
10fbcf4c | 152 | static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); |
1da177e4 | 153 | |
10fbcf4c KS |
154 | static ssize_t node_read_numastat(struct device *dev, |
155 | struct device_attribute *attr, char *buf) | |
1da177e4 | 156 | { |
1da177e4 LT |
157 | return sprintf(buf, |
158 | "numa_hit %lu\n" | |
159 | "numa_miss %lu\n" | |
160 | "numa_foreign %lu\n" | |
161 | "interleave_hit %lu\n" | |
162 | "local_node %lu\n" | |
163 | "other_node %lu\n", | |
75ef7184 MG |
164 | sum_zone_node_page_state(dev->id, NUMA_HIT), |
165 | sum_zone_node_page_state(dev->id, NUMA_MISS), | |
166 | sum_zone_node_page_state(dev->id, NUMA_FOREIGN), | |
167 | sum_zone_node_page_state(dev->id, NUMA_INTERLEAVE_HIT), | |
168 | sum_zone_node_page_state(dev->id, NUMA_LOCAL), | |
169 | sum_zone_node_page_state(dev->id, NUMA_OTHER)); | |
1da177e4 | 170 | } |
10fbcf4c | 171 | static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); |
1da177e4 | 172 | |
10fbcf4c KS |
173 | static ssize_t node_read_vmstat(struct device *dev, |
174 | struct device_attribute *attr, char *buf) | |
2ac39037 MR |
175 | { |
176 | int nid = dev->id; | |
75ef7184 | 177 | struct pglist_data *pgdat = NODE_DATA(nid); |
fa25c503 KM |
178 | int i; |
179 | int n = 0; | |
180 | ||
181 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
182 | n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], | |
75ef7184 MG |
183 | sum_zone_node_page_state(nid, i)); |
184 | ||
185 | for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) | |
186 | n += sprintf(buf+n, "%s %lu\n", | |
187 | vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], | |
188 | node_page_state(pgdat, i)); | |
fa25c503 KM |
189 | |
190 | return n; | |
2ac39037 | 191 | } |
10fbcf4c | 192 | static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); |
2ac39037 | 193 | |
10fbcf4c | 194 | static ssize_t node_read_distance(struct device *dev, |
518d3f38 | 195 | struct device_attribute *attr, char *buf) |
1da177e4 LT |
196 | { |
197 | int nid = dev->id; | |
198 | int len = 0; | |
199 | int i; | |
200 | ||
12ee3c0a DR |
201 | /* |
202 | * buf is currently PAGE_SIZE in length and each node needs 4 chars | |
203 | * at the most (distance + space or newline). | |
204 | */ | |
205 | BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); | |
1da177e4 LT |
206 | |
207 | for_each_online_node(i) | |
208 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); | |
209 | ||
210 | len += sprintf(buf + len, "\n"); | |
211 | return len; | |
212 | } | |
10fbcf4c | 213 | static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); |
1da177e4 | 214 | |
3c9b8aaf TI |
215 | static struct attribute *node_dev_attrs[] = { |
216 | &dev_attr_cpumap.attr, | |
217 | &dev_attr_cpulist.attr, | |
218 | &dev_attr_meminfo.attr, | |
219 | &dev_attr_numastat.attr, | |
220 | &dev_attr_distance.attr, | |
221 | &dev_attr_vmstat.attr, | |
222 | NULL | |
223 | }; | |
7ca7ec40 | 224 | ATTRIBUTE_GROUPS(node_dev); |
3c9b8aaf | 225 | |
9a305230 LS |
226 | #ifdef CONFIG_HUGETLBFS |
227 | /* | |
228 | * hugetlbfs per node attributes registration interface: | |
229 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], | |
4faf8d95 LS |
230 | * it will register its per node attributes for all online nodes with |
231 | * memory. It will also call register_hugetlbfs_with_node(), below, to | |
9a305230 LS |
232 | * register its attribute registration functions with this node driver. |
233 | * Once these hooks have been initialized, the node driver will call into | |
234 | * the hugetlb module to [un]register attributes for hot-plugged nodes. | |
235 | */ | |
236 | static node_registration_func_t __hugetlb_register_node; | |
237 | static node_registration_func_t __hugetlb_unregister_node; | |
238 | ||
39da08cb | 239 | static inline bool hugetlb_register_node(struct node *node) |
9a305230 | 240 | { |
4faf8d95 | 241 | if (__hugetlb_register_node && |
8cebfcd0 | 242 | node_state(node->dev.id, N_MEMORY)) { |
9a305230 | 243 | __hugetlb_register_node(node); |
39da08cb LS |
244 | return true; |
245 | } | |
246 | return false; | |
9a305230 LS |
247 | } |
248 | ||
249 | static inline void hugetlb_unregister_node(struct node *node) | |
250 | { | |
251 | if (__hugetlb_unregister_node) | |
252 | __hugetlb_unregister_node(node); | |
253 | } | |
254 | ||
255 | void register_hugetlbfs_with_node(node_registration_func_t doregister, | |
256 | node_registration_func_t unregister) | |
257 | { | |
258 | __hugetlb_register_node = doregister; | |
259 | __hugetlb_unregister_node = unregister; | |
260 | } | |
261 | #else | |
262 | static inline void hugetlb_register_node(struct node *node) {} | |
263 | ||
264 | static inline void hugetlb_unregister_node(struct node *node) {} | |
265 | #endif | |
266 | ||
8c7b5b4e YI |
267 | static void node_device_release(struct device *dev) |
268 | { | |
269 | struct node *node = to_node(dev); | |
270 | ||
271 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) | |
272 | /* | |
273 | * We schedule the work only when a memory section is | |
274 | * onlined/offlined on this node. When we come here, | |
275 | * all the memory on this node has been offlined, | |
276 | * so we won't enqueue new work to this work. | |
277 | * | |
278 | * The work is using node->node_work, so we should | |
279 | * flush work before freeing the memory. | |
280 | */ | |
281 | flush_work(&node->node_work); | |
282 | #endif | |
283 | kfree(node); | |
284 | } | |
1da177e4 LT |
285 | |
286 | /* | |
405ae7d3 | 287 | * register_node - Setup a sysfs device for a node. |
1da177e4 LT |
288 | * @num - Node number to use when creating the device. |
289 | * | |
290 | * Initialize and register the node device. | |
291 | */ | |
fa264375 | 292 | static int register_node(struct node *node, int num, struct node *parent) |
1da177e4 LT |
293 | { |
294 | int error; | |
295 | ||
10fbcf4c KS |
296 | node->dev.id = num; |
297 | node->dev.bus = &node_subsys; | |
8c7b5b4e | 298 | node->dev.release = node_device_release; |
7ca7ec40 | 299 | node->dev.groups = node_dev_groups; |
10fbcf4c | 300 | error = device_register(&node->dev); |
1da177e4 LT |
301 | |
302 | if (!error){ | |
9a305230 | 303 | hugetlb_register_node(node); |
ed4a6d7f MG |
304 | |
305 | compaction_register_node(node); | |
1da177e4 LT |
306 | } |
307 | return error; | |
308 | } | |
309 | ||
4b45099b KT |
310 | /** |
311 | * unregister_node - unregister a node device | |
312 | * @node: node going away | |
313 | * | |
314 | * Unregisters a node device @node. All the devices on the node must be | |
315 | * unregistered before calling this function. | |
316 | */ | |
317 | void unregister_node(struct node *node) | |
318 | { | |
4faf8d95 | 319 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
af936a16 | 320 | |
10fbcf4c | 321 | device_unregister(&node->dev); |
4b45099b | 322 | } |
1da177e4 | 323 | |
8732794b | 324 | struct node *node_devices[MAX_NUMNODES]; |
0fc44159 | 325 | |
76b67ed9 KH |
326 | /* |
327 | * register cpu under node | |
328 | */ | |
329 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) | |
330 | { | |
1830794a | 331 | int ret; |
8a25a2fd | 332 | struct device *obj; |
76b67ed9 | 333 | |
f8246f31 AC |
334 | if (!node_online(nid)) |
335 | return 0; | |
336 | ||
8a25a2fd | 337 | obj = get_cpu_device(cpu); |
f8246f31 AC |
338 | if (!obj) |
339 | return 0; | |
340 | ||
8732794b | 341 | ret = sysfs_create_link(&node_devices[nid]->dev.kobj, |
f8246f31 AC |
342 | &obj->kobj, |
343 | kobject_name(&obj->kobj)); | |
1830794a AC |
344 | if (ret) |
345 | return ret; | |
346 | ||
347 | return sysfs_create_link(&obj->kobj, | |
8732794b WC |
348 | &node_devices[nid]->dev.kobj, |
349 | kobject_name(&node_devices[nid]->dev.kobj)); | |
76b67ed9 KH |
350 | } |
351 | ||
352 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) | |
353 | { | |
8a25a2fd | 354 | struct device *obj; |
b9d52dad AC |
355 | |
356 | if (!node_online(nid)) | |
357 | return 0; | |
358 | ||
8a25a2fd | 359 | obj = get_cpu_device(cpu); |
b9d52dad AC |
360 | if (!obj) |
361 | return 0; | |
362 | ||
8732794b | 363 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
b9d52dad | 364 | kobject_name(&obj->kobj)); |
1830794a | 365 | sysfs_remove_link(&obj->kobj, |
8732794b | 366 | kobject_name(&node_devices[nid]->dev.kobj)); |
b9d52dad | 367 | |
76b67ed9 KH |
368 | return 0; |
369 | } | |
370 | ||
c04fc586 GH |
371 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
372 | #define page_initialized(page) (page->lru.next) | |
373 | ||
3a80a7fa | 374 | static int __init_refok get_nid_for_pfn(unsigned long pfn) |
c04fc586 GH |
375 | { |
376 | struct page *page; | |
377 | ||
378 | if (!pfn_valid_within(pfn)) | |
379 | return -1; | |
3a80a7fa MG |
380 | #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
381 | if (system_state == SYSTEM_BOOTING) | |
382 | return early_pfn_to_nid(pfn); | |
383 | #endif | |
c04fc586 GH |
384 | page = pfn_to_page(pfn); |
385 | if (!page_initialized(page)) | |
386 | return -1; | |
387 | return pfn_to_nid(pfn); | |
388 | } | |
389 | ||
390 | /* register memory section under specified node if it spans that node */ | |
391 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) | |
392 | { | |
dee5d0d5 | 393 | int ret; |
c04fc586 GH |
394 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
395 | ||
396 | if (!mem_blk) | |
397 | return -EFAULT; | |
398 | if (!node_online(nid)) | |
399 | return 0; | |
d3360164 NF |
400 | |
401 | sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); | |
402 | sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); | |
403 | sect_end_pfn += PAGES_PER_SECTION - 1; | |
c04fc586 GH |
404 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { |
405 | int page_nid; | |
406 | ||
04697858 YL |
407 | /* |
408 | * memory block could have several absent sections from start. | |
409 | * skip pfn range from absent section | |
410 | */ | |
411 | if (!pfn_present(pfn)) { | |
412 | pfn = round_down(pfn + PAGES_PER_SECTION, | |
413 | PAGES_PER_SECTION) - 1; | |
414 | continue; | |
415 | } | |
416 | ||
c04fc586 GH |
417 | page_nid = get_nid_for_pfn(pfn); |
418 | if (page_nid < 0) | |
419 | continue; | |
420 | if (page_nid != nid) | |
421 | continue; | |
8732794b | 422 | ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, |
10fbcf4c KS |
423 | &mem_blk->dev.kobj, |
424 | kobject_name(&mem_blk->dev.kobj)); | |
dee5d0d5 AC |
425 | if (ret) |
426 | return ret; | |
427 | ||
10fbcf4c | 428 | return sysfs_create_link_nowarn(&mem_blk->dev.kobj, |
8732794b WC |
429 | &node_devices[nid]->dev.kobj, |
430 | kobject_name(&node_devices[nid]->dev.kobj)); | |
c04fc586 GH |
431 | } |
432 | /* mem section does not span the specified node */ | |
433 | return 0; | |
434 | } | |
435 | ||
436 | /* unregister memory section under all nodes that it spans */ | |
d3360164 NF |
437 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, |
438 | unsigned long phys_index) | |
c04fc586 | 439 | { |
9ae49fab | 440 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
c04fc586 GH |
441 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
442 | ||
9ae49fab DR |
443 | if (!mem_blk) { |
444 | NODEMASK_FREE(unlinked_nodes); | |
c04fc586 | 445 | return -EFAULT; |
9ae49fab DR |
446 | } |
447 | if (!unlinked_nodes) | |
448 | return -ENOMEM; | |
449 | nodes_clear(*unlinked_nodes); | |
d3360164 NF |
450 | |
451 | sect_start_pfn = section_nr_to_pfn(phys_index); | |
c04fc586 GH |
452 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; |
453 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { | |
47504980 | 454 | int nid; |
c04fc586 GH |
455 | |
456 | nid = get_nid_for_pfn(pfn); | |
457 | if (nid < 0) | |
458 | continue; | |
459 | if (!node_online(nid)) | |
460 | continue; | |
9ae49fab | 461 | if (node_test_and_set(nid, *unlinked_nodes)) |
c04fc586 | 462 | continue; |
8732794b | 463 | sysfs_remove_link(&node_devices[nid]->dev.kobj, |
10fbcf4c KS |
464 | kobject_name(&mem_blk->dev.kobj)); |
465 | sysfs_remove_link(&mem_blk->dev.kobj, | |
8732794b | 466 | kobject_name(&node_devices[nid]->dev.kobj)); |
c04fc586 | 467 | } |
9ae49fab | 468 | NODEMASK_FREE(unlinked_nodes); |
c04fc586 GH |
469 | return 0; |
470 | } | |
471 | ||
472 | static int link_mem_sections(int nid) | |
473 | { | |
474 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; | |
475 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; | |
476 | unsigned long pfn; | |
63d027a6 | 477 | struct memory_block *mem_blk = NULL; |
c04fc586 GH |
478 | int err = 0; |
479 | ||
480 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
481 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
482 | struct mem_section *mem_sect; | |
c04fc586 GH |
483 | int ret; |
484 | ||
485 | if (!present_section_nr(section_nr)) | |
486 | continue; | |
487 | mem_sect = __nr_to_section(section_nr); | |
321bf4ed YL |
488 | |
489 | /* same memblock ? */ | |
490 | if (mem_blk) | |
491 | if ((section_nr >= mem_blk->start_section_nr) && | |
492 | (section_nr <= mem_blk->end_section_nr)) | |
493 | continue; | |
494 | ||
63d027a6 | 495 | mem_blk = find_memory_block_hinted(mem_sect, mem_blk); |
321bf4ed | 496 | |
c04fc586 GH |
497 | ret = register_mem_sect_under_node(mem_blk, nid); |
498 | if (!err) | |
499 | err = ret; | |
500 | ||
501 | /* discard ref obtained in find_memory_block() */ | |
c04fc586 | 502 | } |
63d027a6 RH |
503 | |
504 | if (mem_blk) | |
10fbcf4c | 505 | kobject_put(&mem_blk->dev.kobj); |
c04fc586 GH |
506 | return err; |
507 | } | |
4faf8d95 | 508 | |
39da08cb | 509 | #ifdef CONFIG_HUGETLBFS |
4faf8d95 LS |
510 | /* |
511 | * Handle per node hstate attribute [un]registration on transistions | |
512 | * to/from memoryless state. | |
513 | */ | |
39da08cb LS |
514 | static void node_hugetlb_work(struct work_struct *work) |
515 | { | |
516 | struct node *node = container_of(work, struct node, node_work); | |
517 | ||
518 | /* | |
519 | * We only get here when a node transitions to/from memoryless state. | |
520 | * We can detect which transition occurred by examining whether the | |
521 | * node has memory now. hugetlb_register_node() already check this | |
522 | * so we try to register the attributes. If that fails, then the | |
523 | * node has transitioned to memoryless, try to unregister the | |
524 | * attributes. | |
525 | */ | |
526 | if (!hugetlb_register_node(node)) | |
527 | hugetlb_unregister_node(node); | |
528 | } | |
529 | ||
530 | static void init_node_hugetlb_work(int nid) | |
531 | { | |
8732794b | 532 | INIT_WORK(&node_devices[nid]->node_work, node_hugetlb_work); |
39da08cb | 533 | } |
4faf8d95 LS |
534 | |
535 | static int node_memory_callback(struct notifier_block *self, | |
536 | unsigned long action, void *arg) | |
537 | { | |
538 | struct memory_notify *mnb = arg; | |
539 | int nid = mnb->status_change_nid; | |
540 | ||
541 | switch (action) { | |
39da08cb LS |
542 | case MEM_ONLINE: |
543 | case MEM_OFFLINE: | |
544 | /* | |
545 | * offload per node hstate [un]registration to a work thread | |
546 | * when transitioning to/from memoryless state. | |
547 | */ | |
4faf8d95 | 548 | if (nid != NUMA_NO_NODE) |
8732794b | 549 | schedule_work(&node_devices[nid]->node_work); |
4faf8d95 | 550 | break; |
39da08cb | 551 | |
4faf8d95 LS |
552 | case MEM_GOING_ONLINE: |
553 | case MEM_GOING_OFFLINE: | |
554 | case MEM_CANCEL_ONLINE: | |
555 | case MEM_CANCEL_OFFLINE: | |
556 | default: | |
557 | break; | |
558 | } | |
559 | ||
560 | return NOTIFY_OK; | |
561 | } | |
39da08cb LS |
562 | #endif /* CONFIG_HUGETLBFS */ |
563 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
564 | ||
c04fc586 | 565 | static int link_mem_sections(int nid) { return 0; } |
39da08cb | 566 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
4faf8d95 | 567 | |
39da08cb LS |
568 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
569 | !defined(CONFIG_HUGETLBFS) | |
4faf8d95 LS |
570 | static inline int node_memory_callback(struct notifier_block *self, |
571 | unsigned long action, void *arg) | |
572 | { | |
573 | return NOTIFY_OK; | |
574 | } | |
39da08cb LS |
575 | |
576 | static void init_node_hugetlb_work(int nid) { } | |
577 | ||
578 | #endif | |
c04fc586 | 579 | |
0fc44159 YG |
580 | int register_one_node(int nid) |
581 | { | |
582 | int error = 0; | |
76b67ed9 | 583 | int cpu; |
0fc44159 YG |
584 | |
585 | if (node_online(nid)) { | |
586 | int p_node = parent_node(nid); | |
587 | struct node *parent = NULL; | |
588 | ||
589 | if (p_node != nid) | |
8732794b | 590 | parent = node_devices[p_node]; |
0fc44159 | 591 | |
8732794b WC |
592 | node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); |
593 | if (!node_devices[nid]) | |
594 | return -ENOMEM; | |
595 | ||
596 | error = register_node(node_devices[nid], nid, parent); | |
76b67ed9 KH |
597 | |
598 | /* link cpu under this node */ | |
599 | for_each_present_cpu(cpu) { | |
600 | if (cpu_to_node(cpu) == nid) | |
601 | register_cpu_under_node(cpu, nid); | |
602 | } | |
c04fc586 GH |
603 | |
604 | /* link memory sections under this node */ | |
605 | error = link_mem_sections(nid); | |
39da08cb LS |
606 | |
607 | /* initialize work queue for memory hot plug */ | |
608 | init_node_hugetlb_work(nid); | |
0fc44159 YG |
609 | } |
610 | ||
611 | return error; | |
612 | ||
613 | } | |
614 | ||
615 | void unregister_one_node(int nid) | |
616 | { | |
92d585ef XQ |
617 | if (!node_devices[nid]) |
618 | return; | |
619 | ||
8732794b | 620 | unregister_node(node_devices[nid]); |
8732794b | 621 | node_devices[nid] = NULL; |
0fc44159 YG |
622 | } |
623 | ||
bde631a5 LS |
624 | /* |
625 | * node states attributes | |
626 | */ | |
627 | ||
628 | static ssize_t print_nodes_state(enum node_states state, char *buf) | |
629 | { | |
630 | int n; | |
631 | ||
f799b1a7 TH |
632 | n = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", |
633 | nodemask_pr_args(&node_states[state])); | |
f6238818 RO |
634 | buf[n++] = '\n'; |
635 | buf[n] = '\0'; | |
bde631a5 LS |
636 | return n; |
637 | } | |
638 | ||
b15f562f | 639 | struct node_attr { |
10fbcf4c | 640 | struct device_attribute attr; |
b15f562f AK |
641 | enum node_states state; |
642 | }; | |
bde631a5 | 643 | |
10fbcf4c KS |
644 | static ssize_t show_node_state(struct device *dev, |
645 | struct device_attribute *attr, char *buf) | |
bde631a5 | 646 | { |
b15f562f AK |
647 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
648 | return print_nodes_state(na->state, buf); | |
bde631a5 LS |
649 | } |
650 | ||
b15f562f | 651 | #define _NODE_ATTR(name, state) \ |
10fbcf4c | 652 | { __ATTR(name, 0444, show_node_state, NULL), state } |
bde631a5 | 653 | |
b15f562f | 654 | static struct node_attr node_state_attr[] = { |
fcf07d22 LJ |
655 | [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), |
656 | [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), | |
657 | [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), | |
bde631a5 | 658 | #ifdef CONFIG_HIGHMEM |
fcf07d22 | 659 | [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
20b2f52b LJ |
660 | #endif |
661 | #ifdef CONFIG_MOVABLE_NODE | |
662 | [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), | |
bde631a5 | 663 | #endif |
fcf07d22 | 664 | [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), |
bde631a5 LS |
665 | }; |
666 | ||
10fbcf4c | 667 | static struct attribute *node_state_attrs[] = { |
fcf07d22 LJ |
668 | &node_state_attr[N_POSSIBLE].attr.attr, |
669 | &node_state_attr[N_ONLINE].attr.attr, | |
670 | &node_state_attr[N_NORMAL_MEMORY].attr.attr, | |
3701cde6 | 671 | #ifdef CONFIG_HIGHMEM |
fcf07d22 | 672 | &node_state_attr[N_HIGH_MEMORY].attr.attr, |
20b2f52b LJ |
673 | #endif |
674 | #ifdef CONFIG_MOVABLE_NODE | |
675 | &node_state_attr[N_MEMORY].attr.attr, | |
3701cde6 | 676 | #endif |
fcf07d22 | 677 | &node_state_attr[N_CPU].attr.attr, |
3701cde6 AK |
678 | NULL |
679 | }; | |
bde631a5 | 680 | |
10fbcf4c KS |
681 | static struct attribute_group memory_root_attr_group = { |
682 | .attrs = node_state_attrs, | |
683 | }; | |
684 | ||
685 | static const struct attribute_group *cpu_root_attr_groups[] = { | |
686 | &memory_root_attr_group, | |
687 | NULL, | |
688 | }; | |
689 | ||
4faf8d95 | 690 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
4b45099b | 691 | static int __init register_node_type(void) |
1da177e4 | 692 | { |
bde631a5 LS |
693 | int ret; |
694 | ||
3701cde6 AK |
695 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
696 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); | |
697 | ||
10fbcf4c | 698 | ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); |
4faf8d95 | 699 | if (!ret) { |
6e259e7d AM |
700 | static struct notifier_block node_memory_callback_nb = { |
701 | .notifier_call = node_memory_callback, | |
702 | .priority = NODE_CALLBACK_PRI, | |
703 | }; | |
704 | register_hotmemory_notifier(&node_memory_callback_nb); | |
4faf8d95 | 705 | } |
bde631a5 LS |
706 | |
707 | /* | |
708 | * Note: we're not going to unregister the node class if we fail | |
709 | * to register the node state class attribute files. | |
710 | */ | |
711 | return ret; | |
1da177e4 LT |
712 | } |
713 | postcore_initcall(register_node_type); |