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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 | ||
1da177e4 LT |
29 | static struct ia64_cpu *sysfs_cpus; |
30 | ||
31 | int arch_register_cpu(int num) | |
32 | { | |
b88e9265 | 33 | #if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU) |
55e59c51 AR |
34 | /* |
35 | * If CPEI cannot be re-targetted, and this is | |
36 | * CPEI target, then dont create the control file | |
37 | */ | |
38 | if (!can_cpei_retarget() && is_cpu_cpei_target(num)) | |
39 | sysfs_cpus[num].cpu.no_control = 1; | |
46906c44 | 40 | #endif |
55e59c51 | 41 | |
76b67ed9 | 42 | return register_cpu(&sysfs_cpus[num].cpu, num); |
1da177e4 LT |
43 | } |
44 | ||
45 | #ifdef CONFIG_HOTPLUG_CPU | |
46 | ||
47 | void arch_unregister_cpu(int num) | |
48 | { | |
76b67ed9 | 49 | return unregister_cpu(&sysfs_cpus[num].cpu); |
1da177e4 LT |
50 | } |
51 | EXPORT_SYMBOL(arch_register_cpu); | |
52 | EXPORT_SYMBOL(arch_unregister_cpu); | |
53 | #endif /*CONFIG_HOTPLUG_CPU*/ | |
54 | ||
55 | ||
56 | static int __init topology_init(void) | |
57 | { | |
58 | int i, err = 0; | |
59 | ||
60 | #ifdef CONFIG_NUMA | |
69dcc991 ZY |
61 | /* |
62 | * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes? | |
63 | */ | |
64 | for_each_online_node(i) { | |
0fc44159 | 65 | if ((err = register_one_node(i))) |
1da177e4 | 66 | goto out; |
69dcc991 | 67 | } |
1da177e4 LT |
68 | #endif |
69 | ||
69dcc991 | 70 | sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL); |
1da177e4 LT |
71 | if (!sysfs_cpus) { |
72 | err = -ENOMEM; | |
73 | goto out; | |
74 | } | |
1da177e4 | 75 | |
69dcc991 | 76 | for_each_present_cpu(i) { |
1da177e4 LT |
77 | if((err = arch_register_cpu(i))) |
78 | goto out; | |
69dcc991 | 79 | } |
1da177e4 LT |
80 | out: |
81 | return err; | |
82 | } | |
83 | ||
69dcc991 | 84 | subsys_initcall(topology_init); |
f1918005 ZY |
85 | |
86 | ||
87 | /* | |
88 | * Export cpu cache information through sysfs | |
89 | */ | |
90 | ||
91 | /* | |
92 | * A bunch of string array to get pretty printing | |
93 | */ | |
94 | static const char *cache_types[] = { | |
95 | "", /* not used */ | |
96 | "Instruction", | |
97 | "Data", | |
98 | "Unified" /* unified */ | |
99 | }; | |
100 | ||
101 | static const char *cache_mattrib[]={ | |
102 | "WriteThrough", | |
103 | "WriteBack", | |
104 | "", /* reserved */ | |
105 | "" /* reserved */ | |
106 | }; | |
107 | ||
108 | struct cache_info { | |
109 | pal_cache_config_info_t cci; | |
110 | cpumask_t shared_cpu_map; | |
111 | int level; | |
112 | int type; | |
113 | struct kobject kobj; | |
114 | }; | |
115 | ||
116 | struct cpu_cache_info { | |
117 | struct cache_info *cache_leaves; | |
118 | int num_cache_leaves; | |
119 | struct kobject kobj; | |
120 | }; | |
121 | ||
122 | static struct cpu_cache_info all_cpu_cache_info[NR_CPUS]; | |
123 | #define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y]) | |
124 | ||
125 | #ifdef CONFIG_SMP | |
126 | static void cache_shared_cpu_map_setup( unsigned int cpu, | |
127 | struct cache_info * this_leaf) | |
128 | { | |
129 | pal_cache_shared_info_t csi; | |
130 | int num_shared, i = 0; | |
131 | unsigned int j; | |
132 | ||
133 | if (cpu_data(cpu)->threads_per_core <= 1 && | |
134 | cpu_data(cpu)->cores_per_socket <= 1) { | |
135 | cpu_set(cpu, this_leaf->shared_cpu_map); | |
136 | return; | |
137 | } | |
138 | ||
139 | if (ia64_pal_cache_shared_info(this_leaf->level, | |
140 | this_leaf->type, | |
141 | 0, | |
142 | &csi) != PAL_STATUS_SUCCESS) | |
143 | return; | |
144 | ||
145 | num_shared = (int) csi.num_shared; | |
146 | do { | |
fb1bb34d | 147 | for_each_possible_cpu(j) |
f1918005 ZY |
148 | if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id |
149 | && cpu_data(j)->core_id == csi.log1_cid | |
150 | && cpu_data(j)->thread_id == csi.log1_tid) | |
151 | cpu_set(j, this_leaf->shared_cpu_map); | |
152 | ||
153 | i++; | |
154 | } while (i < num_shared && | |
155 | ia64_pal_cache_shared_info(this_leaf->level, | |
156 | this_leaf->type, | |
157 | i, | |
158 | &csi) == PAL_STATUS_SUCCESS); | |
159 | } | |
160 | #else | |
161 | static void cache_shared_cpu_map_setup(unsigned int cpu, | |
162 | struct cache_info * this_leaf) | |
163 | { | |
164 | cpu_set(cpu, this_leaf->shared_cpu_map); | |
165 | return; | |
166 | } | |
167 | #endif | |
168 | ||
169 | static ssize_t show_coherency_line_size(struct cache_info *this_leaf, | |
170 | char *buf) | |
171 | { | |
172 | return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size); | |
173 | } | |
174 | ||
175 | static ssize_t show_ways_of_associativity(struct cache_info *this_leaf, | |
176 | char *buf) | |
177 | { | |
178 | return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc); | |
179 | } | |
180 | ||
181 | static ssize_t show_attributes(struct cache_info *this_leaf, char *buf) | |
182 | { | |
183 | return sprintf(buf, | |
184 | "%s\n", | |
185 | cache_mattrib[this_leaf->cci.pcci_cache_attr]); | |
186 | } | |
187 | ||
188 | static ssize_t show_size(struct cache_info *this_leaf, char *buf) | |
189 | { | |
190 | return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024); | |
191 | } | |
192 | ||
193 | static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf) | |
194 | { | |
195 | unsigned number_of_sets = this_leaf->cci.pcci_cache_size; | |
196 | number_of_sets /= this_leaf->cci.pcci_assoc; | |
197 | number_of_sets /= 1 << this_leaf->cci.pcci_line_size; | |
198 | ||
199 | return sprintf(buf, "%u\n", number_of_sets); | |
200 | } | |
201 | ||
202 | static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf) | |
203 | { | |
204 | ssize_t len; | |
205 | cpumask_t shared_cpu_map; | |
206 | ||
207 | cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map); | |
208 | len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map); | |
209 | len += sprintf(buf+len, "\n"); | |
210 | return len; | |
211 | } | |
212 | ||
213 | static ssize_t show_type(struct cache_info *this_leaf, char *buf) | |
214 | { | |
215 | int type = this_leaf->type + this_leaf->cci.pcci_unified; | |
216 | return sprintf(buf, "%s\n", cache_types[type]); | |
217 | } | |
218 | ||
219 | static ssize_t show_level(struct cache_info *this_leaf, char *buf) | |
220 | { | |
221 | return sprintf(buf, "%u\n", this_leaf->level); | |
222 | } | |
223 | ||
224 | struct cache_attr { | |
225 | struct attribute attr; | |
226 | ssize_t (*show)(struct cache_info *, char *); | |
227 | ssize_t (*store)(struct cache_info *, const char *, size_t count); | |
228 | }; | |
229 | ||
230 | #ifdef define_one_ro | |
231 | #undef define_one_ro | |
232 | #endif | |
233 | #define define_one_ro(_name) \ | |
234 | static struct cache_attr _name = \ | |
235 | __ATTR(_name, 0444, show_##_name, NULL) | |
236 | ||
237 | define_one_ro(level); | |
238 | define_one_ro(type); | |
239 | define_one_ro(coherency_line_size); | |
240 | define_one_ro(ways_of_associativity); | |
241 | define_one_ro(size); | |
242 | define_one_ro(number_of_sets); | |
243 | define_one_ro(shared_cpu_map); | |
244 | define_one_ro(attributes); | |
245 | ||
246 | static struct attribute * cache_default_attrs[] = { | |
247 | &type.attr, | |
248 | &level.attr, | |
249 | &coherency_line_size.attr, | |
250 | &ways_of_associativity.attr, | |
251 | &attributes.attr, | |
252 | &size.attr, | |
253 | &number_of_sets.attr, | |
254 | &shared_cpu_map.attr, | |
255 | NULL | |
256 | }; | |
257 | ||
258 | #define to_object(k) container_of(k, struct cache_info, kobj) | |
259 | #define to_attr(a) container_of(a, struct cache_attr, attr) | |
260 | ||
261 | static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
262 | { | |
263 | struct cache_attr *fattr = to_attr(attr); | |
264 | struct cache_info *this_leaf = to_object(kobj); | |
265 | ssize_t ret; | |
266 | ||
267 | ret = fattr->show ? fattr->show(this_leaf, buf) : 0; | |
268 | return ret; | |
269 | } | |
270 | ||
271 | static struct sysfs_ops cache_sysfs_ops = { | |
272 | .show = cache_show | |
273 | }; | |
274 | ||
275 | static struct kobj_type cache_ktype = { | |
276 | .sysfs_ops = &cache_sysfs_ops, | |
277 | .default_attrs = cache_default_attrs, | |
278 | }; | |
279 | ||
280 | static struct kobj_type cache_ktype_percpu_entry = { | |
281 | .sysfs_ops = &cache_sysfs_ops, | |
282 | }; | |
283 | ||
284 | static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu) | |
285 | { | |
cbf283c0 JJ |
286 | kfree(all_cpu_cache_info[cpu].cache_leaves); |
287 | all_cpu_cache_info[cpu].cache_leaves = NULL; | |
f1918005 ZY |
288 | all_cpu_cache_info[cpu].num_cache_leaves = 0; |
289 | memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject)); | |
f1918005 ZY |
290 | return; |
291 | } | |
292 | ||
293 | static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu) | |
294 | { | |
295 | u64 i, levels, unique_caches; | |
296 | pal_cache_config_info_t cci; | |
297 | int j; | |
298 | s64 status; | |
299 | struct cache_info *this_cache; | |
300 | int num_cache_leaves = 0; | |
301 | ||
302 | if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) { | |
303 | printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status); | |
304 | return -1; | |
305 | } | |
306 | ||
307 | this_cache=kzalloc(sizeof(struct cache_info)*unique_caches, | |
308 | GFP_KERNEL); | |
309 | if (this_cache == NULL) | |
310 | return -ENOMEM; | |
311 | ||
312 | for (i=0; i < levels; i++) { | |
313 | for (j=2; j >0 ; j--) { | |
314 | if ((status=ia64_pal_cache_config_info(i,j, &cci)) != | |
315 | PAL_STATUS_SUCCESS) | |
316 | continue; | |
317 | ||
318 | this_cache[num_cache_leaves].cci = cci; | |
319 | this_cache[num_cache_leaves].level = i + 1; | |
320 | this_cache[num_cache_leaves].type = j; | |
321 | ||
322 | cache_shared_cpu_map_setup(cpu, | |
323 | &this_cache[num_cache_leaves]); | |
324 | num_cache_leaves ++; | |
325 | } | |
326 | } | |
327 | ||
328 | all_cpu_cache_info[cpu].cache_leaves = this_cache; | |
329 | all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves; | |
330 | ||
331 | memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject)); | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | /* Add cache interface for CPU device */ | |
337 | static int __cpuinit cache_add_dev(struct sys_device * sys_dev) | |
338 | { | |
339 | unsigned int cpu = sys_dev->id; | |
340 | unsigned long i, j; | |
341 | struct cache_info *this_object; | |
342 | int retval = 0; | |
343 | cpumask_t oldmask; | |
344 | ||
345 | if (all_cpu_cache_info[cpu].kobj.parent) | |
346 | return 0; | |
347 | ||
348 | oldmask = current->cpus_allowed; | |
349 | retval = set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
350 | if (unlikely(retval)) | |
351 | return retval; | |
352 | ||
353 | retval = cpu_cache_sysfs_init(cpu); | |
354 | set_cpus_allowed(current, oldmask); | |
355 | if (unlikely(retval < 0)) | |
356 | return retval; | |
357 | ||
358 | all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj; | |
359 | kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache"); | |
360 | all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry; | |
361 | retval = kobject_register(&all_cpu_cache_info[cpu].kobj); | |
362 | ||
363 | for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) { | |
364 | this_object = LEAF_KOBJECT_PTR(cpu,i); | |
365 | this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj; | |
366 | kobject_set_name(&(this_object->kobj), "index%1lu", i); | |
367 | this_object->kobj.ktype = &cache_ktype; | |
368 | retval = kobject_register(&(this_object->kobj)); | |
369 | if (unlikely(retval)) { | |
370 | for (j = 0; j < i; j++) { | |
371 | kobject_unregister( | |
372 | &(LEAF_KOBJECT_PTR(cpu,j)->kobj)); | |
373 | } | |
374 | kobject_unregister(&all_cpu_cache_info[cpu].kobj); | |
375 | cpu_cache_sysfs_exit(cpu); | |
376 | break; | |
377 | } | |
378 | } | |
379 | return retval; | |
380 | } | |
381 | ||
382 | /* Remove cache interface for CPU device */ | |
383 | static int __cpuinit cache_remove_dev(struct sys_device * sys_dev) | |
384 | { | |
385 | unsigned int cpu = sys_dev->id; | |
386 | unsigned long i; | |
387 | ||
388 | for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) | |
389 | kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj)); | |
390 | ||
391 | if (all_cpu_cache_info[cpu].kobj.parent) { | |
392 | kobject_unregister(&all_cpu_cache_info[cpu].kobj); | |
393 | memset(&all_cpu_cache_info[cpu].kobj, | |
394 | 0, | |
395 | sizeof(struct kobject)); | |
396 | } | |
397 | ||
398 | cpu_cache_sysfs_exit(cpu); | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /* | |
404 | * When a cpu is hot-plugged, do a check and initiate | |
405 | * cache kobject if necessary | |
406 | */ | |
83d722f7 | 407 | static int cache_cpu_callback(struct notifier_block *nfb, |
f1918005 ZY |
408 | unsigned long action, void *hcpu) |
409 | { | |
410 | unsigned int cpu = (unsigned long)hcpu; | |
411 | struct sys_device *sys_dev; | |
412 | ||
413 | sys_dev = get_cpu_sysdev(cpu); | |
414 | switch (action) { | |
415 | case CPU_ONLINE: | |
416 | cache_add_dev(sys_dev); | |
417 | break; | |
418 | case CPU_DEAD: | |
419 | cache_remove_dev(sys_dev); | |
420 | break; | |
421 | } | |
422 | return NOTIFY_OK; | |
423 | } | |
424 | ||
425 | static struct notifier_block cache_cpu_notifier = | |
426 | { | |
427 | .notifier_call = cache_cpu_callback | |
428 | }; | |
429 | ||
430 | static int __cpuinit cache_sysfs_init(void) | |
431 | { | |
432 | int i; | |
433 | ||
434 | for_each_online_cpu(i) { | |
435 | cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE, | |
436 | (void *)(long)i); | |
437 | } | |
438 | ||
439 | register_cpu_notifier(&cache_cpu_notifier); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | device_initcall(cache_sysfs_init); | |
445 |