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OMAP3: PM: CPUfreq support for OMAP3EVM board
[linux-ginger.git] / drivers / base / node.c
blob1fe5536d404f134e53b61324f9350c11080337dc
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 Shmem: %8lu kB\n"
89 "Node %d KernelStack: %8lu kB\n"
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",
97 nid, K(i.totalram),
98 nid, K(i.freeram),
99 nid, K(i.totalram - i.freeram),
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)),
108 nid, K(node_page_state(nid, NR_UNEVICTABLE)),
109 nid, K(node_page_state(nid, NR_MLOCK)),
110 #ifdef CONFIG_HIGHMEM
111 nid, K(i.totalhigh),
112 nid, K(i.freehigh),
113 nid, K(i.totalram - i.totalhigh),
114 nid, K(i.freeram - i.freehigh),
115 #endif
116 nid, K(node_page_state(nid, NR_FILE_DIRTY)),
117 nid, K(node_page_state(nid, NR_WRITEBACK)),
118 nid, K(node_page_state(nid, NR_FILE_PAGES)),
119 nid, K(node_page_state(nid, NR_FILE_MAPPED)),
120 nid, K(node_page_state(nid, NR_ANON_PAGES)),
121 nid, K(node_page_state(nid, NR_SHMEM)),
122 nid, node_page_state(nid, NR_KERNEL_STACK) *
123 THREAD_SIZE / 1024,
124 nid, K(node_page_state(nid, NR_PAGETABLE)),
125 nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
126 nid, K(node_page_state(nid, NR_BOUNCE)),
127 nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
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)));
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
139 static ssize_t node_read_numastat(struct sys_device * dev,
140 struct sysdev_attribute *attr, char * buf)
141 {
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",
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));
155 }
156 static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
157
158 static ssize_t node_read_distance(struct sys_device * dev,
159 struct sysdev_attribute *attr, char * buf)
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
176
177 /*
178 * register_node - Setup a sysfs device for a node.
179 * @num - Node number to use when creating the device.
180 *
181 * Initialize and register the node device.
182 */
183 int register_node(struct node *node, int num, struct node *parent)
184 {
185 int error;
186
187 node->sysdev.id = num;
188 node->sysdev.cls = &node_class;
189 error = sysdev_register(&node->sysdev);
190
191 if (!error){
192 sysdev_create_file(&node->sysdev, &attr_cpumap);
193 sysdev_create_file(&node->sysdev, &attr_cpulist);
194 sysdev_create_file(&node->sysdev, &attr_meminfo);
195 sysdev_create_file(&node->sysdev, &attr_numastat);
196 sysdev_create_file(&node->sysdev, &attr_distance);
197
198 scan_unevictable_register_node(node);
199 }
200 return error;
201 }
202
203 /**
204 * unregister_node - unregister a node device
205 * @node: node going away
206 *
207 * Unregisters a node device @node. All the devices on the node must be
208 * unregistered before calling this function.
209 */
210 void unregister_node(struct node *node)
211 {
212 sysdev_remove_file(&node->sysdev, &attr_cpumap);
213 sysdev_remove_file(&node->sysdev, &attr_cpulist);
214 sysdev_remove_file(&node->sysdev, &attr_meminfo);
215 sysdev_remove_file(&node->sysdev, &attr_numastat);
216 sysdev_remove_file(&node->sysdev, &attr_distance);
217
218 scan_unevictable_unregister_node(node);
219
220 sysdev_unregister(&node->sysdev);
221 }
222
223 struct node node_devices[MAX_NUMNODES];
224
225 /*
226 * register cpu under node
227 */
228 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
229 {
230 if (node_online(nid)) {
231 struct sys_device *obj = get_cpu_sysdev(cpu);
232 if (!obj)
233 return 0;
234 return sysfs_create_link(&node_devices[nid].sysdev.kobj,
235 &obj->kobj,
236 kobject_name(&obj->kobj));
237 }
238
239 return 0;
240 }
241
242 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
243 {
244 if (node_online(nid)) {
245 struct sys_device *obj = get_cpu_sysdev(cpu);
246 if (obj)
247 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
248 kobject_name(&obj->kobj));
249 }
250 return 0;
251 }
252
253 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
254 #define page_initialized(page) (page->lru.next)
255
256 static int get_nid_for_pfn(unsigned long pfn)
257 {
258 struct page *page;
259
260 if (!pfn_valid_within(pfn))
261 return -1;
262 page = pfn_to_page(pfn);
263 if (!page_initialized(page))
264 return -1;
265 return pfn_to_nid(pfn);
266 }
267
268 /* register memory section under specified node if it spans that node */
269 int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
270 {
271 unsigned long pfn, sect_start_pfn, sect_end_pfn;
272
273 if (!mem_blk)
274 return -EFAULT;
275 if (!node_online(nid))
276 return 0;
277 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
278 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
279 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
280 int page_nid;
281
282 page_nid = get_nid_for_pfn(pfn);
283 if (page_nid < 0)
284 continue;
285 if (page_nid != nid)
286 continue;
287 return sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
288 &mem_blk->sysdev.kobj,
289 kobject_name(&mem_blk->sysdev.kobj));
290 }
291 /* mem section does not span the specified node */
292 return 0;
293 }
294
295 /* unregister memory section under all nodes that it spans */
296 int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
297 {
298 nodemask_t unlinked_nodes;
299 unsigned long pfn, sect_start_pfn, sect_end_pfn;
300
301 if (!mem_blk)
302 return -EFAULT;
303 nodes_clear(unlinked_nodes);
304 sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
305 sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
306 for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
307 int nid;
308
309 nid = get_nid_for_pfn(pfn);
310 if (nid < 0)
311 continue;
312 if (!node_online(nid))
313 continue;
314 if (node_test_and_set(nid, unlinked_nodes))
315 continue;
316 sysfs_remove_link(&node_devices[nid].sysdev.kobj,
317 kobject_name(&mem_blk->sysdev.kobj));
318 }
319 return 0;
320 }
321
322 static int link_mem_sections(int nid)
323 {
324 unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
325 unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
326 unsigned long pfn;
327 int err = 0;
328
329 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
330 unsigned long section_nr = pfn_to_section_nr(pfn);
331 struct mem_section *mem_sect;
332 struct memory_block *mem_blk;
333 int ret;
334
335 if (!present_section_nr(section_nr))
336 continue;
337 mem_sect = __nr_to_section(section_nr);
338 mem_blk = find_memory_block(mem_sect);
339 ret = register_mem_sect_under_node(mem_blk, nid);
340 if (!err)
341 err = ret;
342
343 /* discard ref obtained in find_memory_block() */
344 kobject_put(&mem_blk->sysdev.kobj);
345 }
346 return err;
347 }
348 #else
349 static int link_mem_sections(int nid) { return 0; }
350 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
351
352 int register_one_node(int nid)
353 {
354 int error = 0;
355 int cpu;
356
357 if (node_online(nid)) {
358 int p_node = parent_node(nid);
359 struct node *parent = NULL;
360
361 if (p_node != nid)
362 parent = &node_devices[p_node];
363
364 error = register_node(&node_devices[nid], nid, parent);
365
366 /* link cpu under this node */
367 for_each_present_cpu(cpu) {
368 if (cpu_to_node(cpu) == nid)
369 register_cpu_under_node(cpu, nid);
370 }
371
372 /* link memory sections under this node */
373 error = link_mem_sections(nid);
374 }
375
376 return error;
377
378 }
379
380 void unregister_one_node(int nid)
381 {
382 unregister_node(&node_devices[nid]);
383 }
384
385 /*
386 * node states attributes
387 */
388
389 static ssize_t print_nodes_state(enum node_states state, char *buf)
390 {
391 int n;
392
393 n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
394 if (n > 0 && PAGE_SIZE > n + 1) {
395 *(buf + n++) = '\n';
396 *(buf + n++) = '\0';
397 }
398 return n;
399 }
400
401 static ssize_t print_nodes_possible(struct sysdev_class *class, char *buf)
402 {
403 return print_nodes_state(N_POSSIBLE, buf);
404 }
405
406 static ssize_t print_nodes_online(struct sysdev_class *class, char *buf)
407 {
408 return print_nodes_state(N_ONLINE, buf);
409 }
410
411 static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
412 char *buf)
413 {
414 return print_nodes_state(N_NORMAL_MEMORY, buf);
415 }
416
417 static ssize_t print_nodes_has_cpu(struct sysdev_class *class, char *buf)
418 {
419 return print_nodes_state(N_CPU, buf);
420 }
421
422 static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
423 static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
424 static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
425 NULL);
426 static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
427
428 #ifdef CONFIG_HIGHMEM
429 static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
430 char *buf)
431 {
432 return print_nodes_state(N_HIGH_MEMORY, buf);
433 }
434
435 static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
436 NULL);
437 #endif
438
439 struct sysdev_class_attribute *node_state_attr[] = {
440 &attr_possible,
441 &attr_online,
442 &attr_has_normal_memory,
443 #ifdef CONFIG_HIGHMEM
444 &attr_has_high_memory,
445 #endif
446 &attr_has_cpu,
447 };
448
449 static int node_states_init(void)
450 {
451 int i;
452 int err = 0;
453
454 for (i = 0; i < NR_NODE_STATES; i++) {
455 int ret;
456 ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
457 if (!err)
458 err = ret;
459 }
460 return err;
461 }
462
463 static int __init register_node_type(void)
464 {
465 int ret;
466
467 ret = sysdev_class_register(&node_class);
468 if (!ret)
469 ret = node_states_init();
470
471 /*
472 * Note: we're not going to unregister the node class if we fail
473 * to register the node state class attribute files.
474 */
475 return ret;
476 }
477 postcore_initcall(register_node_type);
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