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Merge branch 'fix/pcm-hwptr' into for-linus
[linux/fpc-iii.git] / drivers / base / node.c
blob91d4087b4039490a844d23e909ffe34eaa0ff0f9
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>
9 #include <linux/memory.h>
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>
15 #include <linux/cpu.h>
16 #include <linux/device.h>
17 #include <linux/swap.h>
18
19 static struct sysdev_class node_class = {
20 .name = "node",
21 };
22
23
24 static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
25 {
26 struct node *node_dev = to_node(dev);
27 const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
28 int len;
29
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));
32
33 len = type?
34 cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
35 cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
36 buf[len++] = '\n';
37 buf[len] = '\0';
38 return len;
39 }
40
41 static inline ssize_t node_read_cpumask(struct sys_device *dev,
42 struct sysdev_attribute *attr, char *buf)
43 {
44 return node_read_cpumap(dev, 0, buf);
45 }
46 static inline ssize_t node_read_cpulist(struct sys_device *dev,
47 struct sysdev_attribute *attr, char *buf)
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);
54
55 #define K(x) ((x) << (PAGE_SHIFT - 10))
56 static ssize_t node_read_meminfo(struct sys_device * dev,
57 struct sysdev_attribute *attr, char * buf)
58 {
59 int n;
60 int nid = dev->id;
61 struct sysinfo i;
62
63 si_meminfo_node(&i, nid);
64
65 n = sprintf(buf, "\n"
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"
75 "Node %d Unevictable: %8lu kB\n"
76 "Node %d Mlocked: %8lu kB\n"
77 #ifdef CONFIG_HIGHMEM
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"
82 #endif
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"
88 "Node %d PageTables: %8lu kB\n"
89 "Node %d NFS_Unstable: %8lu kB\n"
90 "Node %d Bounce: %8lu kB\n"
91 "Node %d WritebackTmp: %8lu kB\n"
92 "Node %d Slab: %8lu kB\n"
93 "Node %d SReclaimable: %8lu kB\n"
94 "Node %d SUnreclaim: %8lu kB\n",
95 nid, K(i.totalram),
96 nid, K(i.freeram),
97 nid, K(i.totalram - i.freeram),
98 nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
99 node_page_state(nid, NR_ACTIVE_FILE)),
100 nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
101 node_page_state(nid, NR_INACTIVE_FILE)),
102 nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
103 nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
104 nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
105 nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
106 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
107 nid, K(node_page_state(nid, NR_MLOCK)),
108 #ifdef CONFIG_HIGHMEM
109 nid, K(i.totalhigh),
110 nid, K(i.freehigh),
111 nid, K(i.totalram - i.totalhigh),
112 nid, K(i.freeram - i.freehigh),
113 #endif
114 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
115 nid, K(node_page_state(nid, NR_WRITEBACK)),
116 nid, K(node_page_state(nid, NR_FILE_PAGES)),
117 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
118 nid, K(node_page_state(nid, NR_ANON_PAGES)),
119 nid, K(node_page_state(nid, NR_PAGETABLE)),
120 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
121 nid, K(node_page_state(nid, NR_BOUNCE)),
122 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
123 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
124 node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
125 nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
126 nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
127 n += hugetlb_report_node_meminfo(nid, buf + n);
128 return n;
129 }
130
131 #undef K
132 static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
133
134 static ssize_t node_read_numastat(struct sys_device * dev,
135 struct sysdev_attribute *attr, char * buf)
136 {
137 return sprintf(buf,
138 "numa_hit %lu\n"
139 "numa_miss %lu\n"
140 "numa_foreign %lu\n"
141 "interleave_hit %lu\n"
142 "local_node %lu\n"
143 "other_node %lu\n",
144 node_page_state(dev->id, NUMA_HIT),
145 node_page_state(dev->id, NUMA_MISS),
146 node_page_state(dev->id, NUMA_FOREIGN),
147 node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
148 node_page_state(dev->id, NUMA_LOCAL),
149 node_page_state(dev->id, NUMA_OTHER));
150 }
151 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
152
153 static ssize_t node_read_distance(struct sys_device * dev,
154 struct sysdev_attribute *attr, char * buf)
155 {
156 int nid = dev->id;
157 int len = 0;
158 int i;
159
160 /* buf currently PAGE_SIZE, need ~4 chars per node */
161 BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
162
163 for_each_online_node(i)
164 len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
165
166 len += sprintf(buf + len, "\n");
167 return len;
168 }
169 static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
170
171
172 /*
173 * register_node - Setup a sysfs device for a node.
174 * @num - Node number to use when creating the device.
175 *
176 * Initialize and register the node device.
177 */
178 int register_node(struct node *node, int num, struct node *parent)
179 {
180 int error;
181
182 node->sysdev.id = num;
183 node->sysdev.cls = &node_class;
184 error = sysdev_register(&node->sysdev);
185
186 if (!error){
187 sysdev_create_file(&node->sysdev, &attr_cpumap);
188 sysdev_create_file(&node->sysdev, &attr_cpulist);
189 sysdev_create_file(&node->sysdev, &attr_meminfo);
190 sysdev_create_file(&node->sysdev, &attr_numastat);
191 sysdev_create_file(&node->sysdev, &attr_distance);
192
193 scan_unevictable_register_node(node);
194 }
195 return error;
196 }
197
198 /**
199 * unregister_node - unregister a node device
200 * @node: node going away
201 *
202 * Unregisters a node device @node. All the devices on the node must be
203 * unregistered before calling this function.
204 */
205 void unregister_node(struct node *node)
206 {
207 sysdev_remove_file(&node->sysdev, &attr_cpumap);
208 sysdev_remove_file(&node->sysdev, &attr_cpulist);
209 sysdev_remove_file(&node->sysdev, &attr_meminfo);
210 sysdev_remove_file(&node->sysdev, &attr_numastat);
211 sysdev_remove_file(&node->sysdev, &attr_distance);
212
213 scan_unevictable_unregister_node(node);
214
215 sysdev_unregister(&node->sysdev);
216 }
217
218 struct node node_devices[MAX_NUMNODES];
219
220 /*
221 * register cpu under node
222 */
223 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
224 {
225 if (node_online(nid)) {
226 struct sys_device *obj = get_cpu_sysdev(cpu);
227 if (!obj)
228 return 0;
229 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
230 &obj->kobj,
231 kobject_name(&obj->kobj));
232 }
233
234 return 0;
235 }
236
237 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
238 {
239 if (node_online(nid)) {
240 struct sys_device *obj = get_cpu_sysdev(cpu);
241 if (obj)
242 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
243 kobject_name(&obj->kobj));
244 }
245 return 0;
246 }
247
248 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
249 #define page_initialized(page) (page->lru.next)
250
251 static int get_nid_for_pfn(unsigned long pfn)
252 {
253 struct page *page;
254
255 if (!pfn_valid_within(pfn))
256 return -1;
257 page = pfn_to_page(pfn);
258 if (!page_initialized(page))
259 return -1;
260 return pfn_to_nid(pfn);
261 }
262
263 /* register memory section under specified node if it spans that node */
264 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
265 {
266 unsigned long pfn, sect_start_pfn, sect_end_pfn;
267
268 if (!mem_blk)
269 return -EFAULT;
270 if (!node_online(nid))
271 return 0;
272 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
273 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
274 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
275 int page_nid;
276
277 page_nid = get_nid_for_pfn(pfn);
278 if (page_nid < 0)
279 continue;
280 if (page_nid != nid)
281 continue;
282 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
283 &mem_blk->sysdev.kobj,
284 kobject_name(&mem_blk->sysdev.kobj));
285 }
286 /* mem section does not span the specified node */
287 return 0;
288 }
289
290 /* unregister memory section under all nodes that it spans */
291 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
292 {
293 nodemask_t unlinked_nodes;
294 unsigned long pfn, sect_start_pfn, sect_end_pfn;
295
296 if (!mem_blk)
297 return -EFAULT;
298 nodes_clear(unlinked_nodes);
299 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
300 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
301 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
302 int nid;
303
304 nid = get_nid_for_pfn(pfn);
305 if (nid < 0)
306 continue;
307 if (!node_online(nid))
308 continue;
309 if (node_test_and_set(nid, unlinked_nodes))
310 continue;
311 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
312 kobject_name(&mem_blk->sysdev.kobj));
313 }
314 return 0;
315 }
316
317 static int link_mem_sections(int nid)
318 {
319 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
320 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
321 unsigned long pfn;
322 int err = 0;
323
324 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
325 unsigned long section_nr = pfn_to_section_nr(pfn);
326 struct mem_section *mem_sect;
327 struct memory_block *mem_blk;
328 int ret;
329
330 if (!present_section_nr(section_nr))
331 continue;
332 mem_sect = __nr_to_section(section_nr);
333 mem_blk = find_memory_block(mem_sect);
334 ret = register_mem_sect_under_node(mem_blk, nid);
335 if (!err)
336 err = ret;
337
338 /* discard ref obtained in find_memory_block() */
339 kobject_put(&mem_blk->sysdev.kobj);
340 }
341 return err;
342 }
343 #else
344 static int link_mem_sections(int nid) { return 0; }
345 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
346
347 int register_one_node(int nid)
348 {
349 int error = 0;
350 int cpu;
351
352 if (node_online(nid)) {
353 int p_node = parent_node(nid);
354 struct node *parent = NULL;
355
356 if (p_node != nid)
357 parent = &node_devices[p_node];
358
359 error = register_node(&node_devices[nid], nid, parent);
360
361 /* link cpu under this node */
362 for_each_present_cpu(cpu) {
363 if (cpu_to_node(cpu) == nid)
364 register_cpu_under_node(cpu, nid);
365 }
366
367 /* link memory sections under this node */
368 error = link_mem_sections(nid);
369 }
370
371 return error;
372
373 }
374
375 void unregister_one_node(int nid)
376 {
377 unregister_node(&node_devices[nid]);
378 }
379
380 /*
381 * node states attributes
382 */
383
384 static ssize_t print_nodes_state(enum node_states state, char *buf)
385 {
386 int n;
387
388 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
389 if (n > 0 && PAGE_SIZE > n + 1) {
390 *(buf + n++) = '\n';
391 *(buf + n++) = '\0';
392 }
393 return n;
394 }
395
396 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
397 {
398 return print_nodes_state(N_POSSIBLE, buf);
399 }
400
401 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
402 {
403 return print_nodes_state(N_ONLINE, buf);
404 }
405
406 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
407 char *buf)
408 {
409 return print_nodes_state(N_NORMAL_MEMORY, buf);
410 }
411
412 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
413 {
414 return print_nodes_state(N_CPU, buf);
415 }
416
417 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
418 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
419 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
420 NULL);
421 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
422
423 #ifdef CONFIG_HIGHMEM
424 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
425 char *buf)
426 {
427 return print_nodes_state(N_HIGH_MEMORY, buf);
428 }
429
430 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
431 NULL);
432 #endif
433
434 struct sysdev_class_attribute *node_state_attr[] = {
435 &attr_possible,
436 &attr_online,
437 &attr_has_normal_memory,
438 #ifdef CONFIG_HIGHMEM
439 &attr_has_high_memory,
440 #endif
441 &attr_has_cpu,
442 };
443
444 static int node_states_init(void)
445 {
446 int i;
447 int err = 0;
448
449 for (i = 0; i < NR_NODE_STATES; i++) {
450 int ret;
451 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
452 if (!err)
453 err = ret;
454 }
455 return err;
456 }
457
458 static int __init register_node_type(void)
459 {
460 int ret;
461
462 ret = sysdev_class_register(&node_class);
463 if (!ret)
464 ret = node_states_init();
465
466 /*
467 * Note: we're not going to unregister the node class if we fail
468 * to register the node state class attribute files.
469 */
470 return ret;
471 }
472 postcore_initcall(register_node_type);
Linux with added FPC-III support