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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * This file contains NUMA specific variables and functions which can | |
7 | * be split away from DISCONTIGMEM and are used on NUMA machines with | |
8 | * contiguous memory. | |
9 | * 2002/08/07 Erich Focht <efocht@ess.nec.de> | |
10 | * Populate cpu entries in sysfs for non-numa systems as well | |
11 | * Intel Corporation - Ashok Raj | |
f1918005 ZY |
12 | * 02/27/2006 Zhang, Yanmin |
13 | * Populate cpu cache entries in sysfs for cpu cache info | |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/config.h> | |
17 | #include <linux/cpu.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/node.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/bootmem.h> | |
23 | #include <linux/nodemask.h> | |
f1918005 | 24 | #include <linux/notifier.h> |
1da177e4 LT |
25 | #include <asm/mmzone.h> |
26 | #include <asm/numa.h> | |
27 | #include <asm/cpu.h> | |
28 | ||
29 | #ifdef CONFIG_NUMA | |
30 | static struct node *sysfs_nodes; | |
31 | #endif | |
32 | static struct ia64_cpu *sysfs_cpus; | |
33 | ||
34 | int arch_register_cpu(int num) | |
35 | { | |
36 | struct node *parent = NULL; | |
37 | ||
38 | #ifdef CONFIG_NUMA | |
39 | parent = &sysfs_nodes[cpu_to_node(num)]; | |
40 | #endif /* CONFIG_NUMA */ | |
41 | ||
b88e9265 | 42 | #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU) |
55e59c51 AR |
43 | /* |
44 | * If CPEI cannot be re-targetted, and this is | |
45 | * CPEI target, then dont create the control file | |
46 | */ | |
47 | if (!can_cpei_retarget() && is_cpu_cpei_target(num)) | |
48 | sysfs_cpus[num].cpu.no_control = 1; | |
46906c44 | 49 | #endif |
55e59c51 | 50 | |
1da177e4 LT |
51 | return register_cpu(&sysfs_cpus[num].cpu, num, parent); |
52 | } | |
53 | ||
54 | #ifdef CONFIG_HOTPLUG_CPU | |
55 | ||
56 | void arch_unregister_cpu(int num) | |
57 | { | |
58 | struct node *parent = NULL; | |
59 | ||
60 | #ifdef CONFIG_NUMA | |
61 | int node = cpu_to_node(num); | |
62 | parent = &sysfs_nodes[node]; | |
63 | #endif /* CONFIG_NUMA */ | |
64 | ||
65 | return unregister_cpu(&sysfs_cpus[num].cpu, parent); | |
66 | } | |
67 | EXPORT_SYMBOL(arch_register_cpu); | |
68 | EXPORT_SYMBOL(arch_unregister_cpu); | |
69 | #endif /*CONFIG_HOTPLUG_CPU*/ | |
70 | ||
71 | ||
72 | static int __init topology_init(void) | |
73 | { | |
74 | int i, err = 0; | |
75 | ||
76 | #ifdef CONFIG_NUMA | |
69dcc991 | 77 | sysfs_nodes = kzalloc(sizeof(struct node) * MAX_NUMNODES, GFP_KERNEL); |
1da177e4 LT |
78 | if (!sysfs_nodes) { |
79 | err = -ENOMEM; | |
80 | goto out; | |
81 | } | |
1da177e4 | 82 | |
69dcc991 ZY |
83 | /* |
84 | * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes? | |
85 | */ | |
86 | for_each_online_node(i) { | |
1da177e4 LT |
87 | if ((err = register_node(&sysfs_nodes[i], i, 0))) |
88 | goto out; | |
69dcc991 | 89 | } |
1da177e4 LT |
90 | #endif |
91 | ||
69dcc991 | 92 | sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL); |
1da177e4 LT |
93 | if (!sysfs_cpus) { |
94 | err = -ENOMEM; | |
95 | goto out; | |
96 | } | |
1da177e4 | 97 | |
69dcc991 | 98 | for_each_present_cpu(i) { |
1da177e4 LT |
99 | if((err = arch_register_cpu(i))) |
100 | goto out; | |
69dcc991 | 101 | } |
1da177e4 LT |
102 | out: |
103 | return err; | |
104 | } | |
105 | ||
69dcc991 | 106 | subsys_initcall(topology_init); |
f1918005 ZY |
107 | |
108 | ||
109 | /* | |
110 | * Export cpu cache information through sysfs | |
111 | */ | |
112 | ||
113 | /* | |
114 | * A bunch of string array to get pretty printing | |
115 | */ | |
116 | static const char *cache_types[] = { | |
117 | "", /* not used */ | |
118 | "Instruction", | |
119 | "Data", | |
120 | "Unified" /* unified */ | |
121 | }; | |
122 | ||
123 | static const char *cache_mattrib[]={ | |
124 | "WriteThrough", | |
125 | "WriteBack", | |
126 | "", /* reserved */ | |
127 | "" /* reserved */ | |
128 | }; | |
129 | ||
130 | struct cache_info { | |
131 | pal_cache_config_info_t cci; | |
132 | cpumask_t shared_cpu_map; | |
133 | int level; | |
134 | int type; | |
135 | struct kobject kobj; | |
136 | }; | |
137 | ||
138 | struct cpu_cache_info { | |
139 | struct cache_info *cache_leaves; | |
140 | int num_cache_leaves; | |
141 | struct kobject kobj; | |
142 | }; | |
143 | ||
144 | static struct cpu_cache_info all_cpu_cache_info[NR_CPUS]; | |
145 | #define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y]) | |
146 | ||
147 | #ifdef CONFIG_SMP | |
148 | static void cache_shared_cpu_map_setup( unsigned int cpu, | |
149 | struct cache_info * this_leaf) | |
150 | { | |
151 | pal_cache_shared_info_t csi; | |
152 | int num_shared, i = 0; | |
153 | unsigned int j; | |
154 | ||
155 | if (cpu_data(cpu)->threads_per_core <= 1 && | |
156 | cpu_data(cpu)->cores_per_socket <= 1) { | |
157 | cpu_set(cpu, this_leaf->shared_cpu_map); | |
158 | return; | |
159 | } | |
160 | ||
161 | if (ia64_pal_cache_shared_info(this_leaf->level, | |
162 | this_leaf->type, | |
163 | 0, | |
164 | &csi) != PAL_STATUS_SUCCESS) | |
165 | return; | |
166 | ||
167 | num_shared = (int) csi.num_shared; | |
168 | do { | |
169 | for_each_cpu(j) | |
170 | if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id | |
171 | && cpu_data(j)->core_id == csi.log1_cid | |
172 | && cpu_data(j)->thread_id == csi.log1_tid) | |
173 | cpu_set(j, this_leaf->shared_cpu_map); | |
174 | ||
175 | i++; | |
176 | } while (i < num_shared && | |
177 | ia64_pal_cache_shared_info(this_leaf->level, | |
178 | this_leaf->type, | |
179 | i, | |
180 | &csi) == PAL_STATUS_SUCCESS); | |
181 | } | |
182 | #else | |
183 | static void cache_shared_cpu_map_setup(unsigned int cpu, | |
184 | struct cache_info * this_leaf) | |
185 | { | |
186 | cpu_set(cpu, this_leaf->shared_cpu_map); | |
187 | return; | |
188 | } | |
189 | #endif | |
190 | ||
191 | static ssize_t show_coherency_line_size(struct cache_info *this_leaf, | |
192 | char *buf) | |
193 | { | |
194 | return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size); | |
195 | } | |
196 | ||
197 | static ssize_t show_ways_of_associativity(struct cache_info *this_leaf, | |
198 | char *buf) | |
199 | { | |
200 | return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc); | |
201 | } | |
202 | ||
203 | static ssize_t show_attributes(struct cache_info *this_leaf, char *buf) | |
204 | { | |
205 | return sprintf(buf, | |
206 | "%s\n", | |
207 | cache_mattrib[this_leaf->cci.pcci_cache_attr]); | |
208 | } | |
209 | ||
210 | static ssize_t show_size(struct cache_info *this_leaf, char *buf) | |
211 | { | |
212 | return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024); | |
213 | } | |
214 | ||
215 | static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf) | |
216 | { | |
217 | unsigned number_of_sets = this_leaf->cci.pcci_cache_size; | |
218 | number_of_sets /= this_leaf->cci.pcci_assoc; | |
219 | number_of_sets /= 1 << this_leaf->cci.pcci_line_size; | |
220 | ||
221 | return sprintf(buf, "%u\n", number_of_sets); | |
222 | } | |
223 | ||
224 | static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf) | |
225 | { | |
226 | ssize_t len; | |
227 | cpumask_t shared_cpu_map; | |
228 | ||
229 | cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map); | |
230 | len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map); | |
231 | len += sprintf(buf+len, "\n"); | |
232 | return len; | |
233 | } | |
234 | ||
235 | static ssize_t show_type(struct cache_info *this_leaf, char *buf) | |
236 | { | |
237 | int type = this_leaf->type + this_leaf->cci.pcci_unified; | |
238 | return sprintf(buf, "%s\n", cache_types[type]); | |
239 | } | |
240 | ||
241 | static ssize_t show_level(struct cache_info *this_leaf, char *buf) | |
242 | { | |
243 | return sprintf(buf, "%u\n", this_leaf->level); | |
244 | } | |
245 | ||
246 | struct cache_attr { | |
247 | struct attribute attr; | |
248 | ssize_t (*show)(struct cache_info *, char *); | |
249 | ssize_t (*store)(struct cache_info *, const char *, size_t count); | |
250 | }; | |
251 | ||
252 | #ifdef define_one_ro | |
253 | #undef define_one_ro | |
254 | #endif | |
255 | #define define_one_ro(_name) \ | |
256 | static struct cache_attr _name = \ | |
257 | __ATTR(_name, 0444, show_##_name, NULL) | |
258 | ||
259 | define_one_ro(level); | |
260 | define_one_ro(type); | |
261 | define_one_ro(coherency_line_size); | |
262 | define_one_ro(ways_of_associativity); | |
263 | define_one_ro(size); | |
264 | define_one_ro(number_of_sets); | |
265 | define_one_ro(shared_cpu_map); | |
266 | define_one_ro(attributes); | |
267 | ||
268 | static struct attribute * cache_default_attrs[] = { | |
269 | &type.attr, | |
270 | &level.attr, | |
271 | &coherency_line_size.attr, | |
272 | &ways_of_associativity.attr, | |
273 | &attributes.attr, | |
274 | &size.attr, | |
275 | &number_of_sets.attr, | |
276 | &shared_cpu_map.attr, | |
277 | NULL | |
278 | }; | |
279 | ||
280 | #define to_object(k) container_of(k, struct cache_info, kobj) | |
281 | #define to_attr(a) container_of(a, struct cache_attr, attr) | |
282 | ||
283 | static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
284 | { | |
285 | struct cache_attr *fattr = to_attr(attr); | |
286 | struct cache_info *this_leaf = to_object(kobj); | |
287 | ssize_t ret; | |
288 | ||
289 | ret = fattr->show ? fattr->show(this_leaf, buf) : 0; | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static struct sysfs_ops cache_sysfs_ops = { | |
294 | .show = cache_show | |
295 | }; | |
296 | ||
297 | static struct kobj_type cache_ktype = { | |
298 | .sysfs_ops = &cache_sysfs_ops, | |
299 | .default_attrs = cache_default_attrs, | |
300 | }; | |
301 | ||
302 | static struct kobj_type cache_ktype_percpu_entry = { | |
303 | .sysfs_ops = &cache_sysfs_ops, | |
304 | }; | |
305 | ||
306 | static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu) | |
307 | { | |
cbf283c0 JJ |
308 | kfree(all_cpu_cache_info[cpu].cache_leaves); |
309 | all_cpu_cache_info[cpu].cache_leaves = NULL; | |
f1918005 ZY |
310 | all_cpu_cache_info[cpu].num_cache_leaves = 0; |
311 | memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject)); | |
f1918005 ZY |
312 | return; |
313 | } | |
314 | ||
315 | static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu) | |
316 | { | |
317 | u64 i, levels, unique_caches; | |
318 | pal_cache_config_info_t cci; | |
319 | int j; | |
320 | s64 status; | |
321 | struct cache_info *this_cache; | |
322 | int num_cache_leaves = 0; | |
323 | ||
324 | if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) { | |
325 | printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status); | |
326 | return -1; | |
327 | } | |
328 | ||
329 | this_cache=kzalloc(sizeof(struct cache_info)*unique_caches, | |
330 | GFP_KERNEL); | |
331 | if (this_cache == NULL) | |
332 | return -ENOMEM; | |
333 | ||
334 | for (i=0; i < levels; i++) { | |
335 | for (j=2; j >0 ; j--) { | |
336 | if ((status=ia64_pal_cache_config_info(i,j, &cci)) != | |
337 | PAL_STATUS_SUCCESS) | |
338 | continue; | |
339 | ||
340 | this_cache[num_cache_leaves].cci = cci; | |
341 | this_cache[num_cache_leaves].level = i + 1; | |
342 | this_cache[num_cache_leaves].type = j; | |
343 | ||
344 | cache_shared_cpu_map_setup(cpu, | |
345 | &this_cache[num_cache_leaves]); | |
346 | num_cache_leaves ++; | |
347 | } | |
348 | } | |
349 | ||
350 | all_cpu_cache_info[cpu].cache_leaves = this_cache; | |
351 | all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves; | |
352 | ||
353 | memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject)); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | /* Add cache interface for CPU device */ | |
359 | static int __cpuinit cache_add_dev(struct sys_device * sys_dev) | |
360 | { | |
361 | unsigned int cpu = sys_dev->id; | |
362 | unsigned long i, j; | |
363 | struct cache_info *this_object; | |
364 | int retval = 0; | |
365 | cpumask_t oldmask; | |
366 | ||
367 | if (all_cpu_cache_info[cpu].kobj.parent) | |
368 | return 0; | |
369 | ||
370 | oldmask = current->cpus_allowed; | |
371 | retval = set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
372 | if (unlikely(retval)) | |
373 | return retval; | |
374 | ||
375 | retval = cpu_cache_sysfs_init(cpu); | |
376 | set_cpus_allowed(current, oldmask); | |
377 | if (unlikely(retval < 0)) | |
378 | return retval; | |
379 | ||
380 | all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj; | |
381 | kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache"); | |
382 | all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry; | |
383 | retval = kobject_register(&all_cpu_cache_info[cpu].kobj); | |
384 | ||
385 | for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) { | |
386 | this_object = LEAF_KOBJECT_PTR(cpu,i); | |
387 | this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj; | |
388 | kobject_set_name(&(this_object->kobj), "index%1lu", i); | |
389 | this_object->kobj.ktype = &cache_ktype; | |
390 | retval = kobject_register(&(this_object->kobj)); | |
391 | if (unlikely(retval)) { | |
392 | for (j = 0; j < i; j++) { | |
393 | kobject_unregister( | |
394 | &(LEAF_KOBJECT_PTR(cpu,j)->kobj)); | |
395 | } | |
396 | kobject_unregister(&all_cpu_cache_info[cpu].kobj); | |
397 | cpu_cache_sysfs_exit(cpu); | |
398 | break; | |
399 | } | |
400 | } | |
401 | return retval; | |
402 | } | |
403 | ||
404 | /* Remove cache interface for CPU device */ | |
405 | static int __cpuinit cache_remove_dev(struct sys_device * sys_dev) | |
406 | { | |
407 | unsigned int cpu = sys_dev->id; | |
408 | unsigned long i; | |
409 | ||
410 | for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) | |
411 | kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj)); | |
412 | ||
413 | if (all_cpu_cache_info[cpu].kobj.parent) { | |
414 | kobject_unregister(&all_cpu_cache_info[cpu].kobj); | |
415 | memset(&all_cpu_cache_info[cpu].kobj, | |
416 | 0, | |
417 | sizeof(struct kobject)); | |
418 | } | |
419 | ||
420 | cpu_cache_sysfs_exit(cpu); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | /* | |
426 | * When a cpu is hot-plugged, do a check and initiate | |
427 | * cache kobject if necessary | |
428 | */ | |
83d722f7 | 429 | static int cache_cpu_callback(struct notifier_block *nfb, |
f1918005 ZY |
430 | unsigned long action, void *hcpu) |
431 | { | |
432 | unsigned int cpu = (unsigned long)hcpu; | |
433 | struct sys_device *sys_dev; | |
434 | ||
435 | sys_dev = get_cpu_sysdev(cpu); | |
436 | switch (action) { | |
437 | case CPU_ONLINE: | |
438 | cache_add_dev(sys_dev); | |
439 | break; | |
440 | case CPU_DEAD: | |
441 | cache_remove_dev(sys_dev); | |
442 | break; | |
443 | } | |
444 | return NOTIFY_OK; | |
445 | } | |
446 | ||
447 | static struct notifier_block cache_cpu_notifier = | |
448 | { | |
449 | .notifier_call = cache_cpu_callback | |
450 | }; | |
451 | ||
452 | static int __cpuinit cache_sysfs_init(void) | |
453 | { | |
454 | int i; | |
455 | ||
456 | for_each_online_cpu(i) { | |
457 | cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE, | |
458 | (void *)(long)i); | |
459 | } | |
460 | ||
461 | register_cpu_notifier(&cache_cpu_notifier); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | device_initcall(cache_sysfs_init); | |
467 |