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[PATCH] fix missing includes
[deliverable/linux.git] / arch / i386 / kernel / cpu / intel_cacheinfo.c
1 /*
2 * Routines to indentify caches on Intel CPU.
3 *
4 * Changes:
5 * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
6 * Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
7 */
8
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/device.h>
12 #include <linux/compiler.h>
13 #include <linux/cpu.h>
14 #include <linux/sched.h>
15
16 #include <asm/processor.h>
17 #include <asm/smp.h>
18
19 #define LVL_1_INST 1
20 #define LVL_1_DATA 2
21 #define LVL_2 3
22 #define LVL_3 4
23 #define LVL_TRACE 5
24
25 struct _cache_table
26 {
27 unsigned char descriptor;
28 char cache_type;
29 short size;
30 };
31
32 /* all the cache descriptor types we care about (no TLB or trace cache entries) */
33 static struct _cache_table cache_table[] __cpuinitdata =
34 {
35 { 0x06, LVL_1_INST, 8 }, /* 4-way set assoc, 32 byte line size */
36 { 0x08, LVL_1_INST, 16 }, /* 4-way set assoc, 32 byte line size */
37 { 0x0a, LVL_1_DATA, 8 }, /* 2 way set assoc, 32 byte line size */
38 { 0x0c, LVL_1_DATA, 16 }, /* 4-way set assoc, 32 byte line size */
39 { 0x22, LVL_3, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
40 { 0x23, LVL_3, 1024 }, /* 8-way set assoc, sectored cache, 64 byte line size */
41 { 0x25, LVL_3, 2048 }, /* 8-way set assoc, sectored cache, 64 byte line size */
42 { 0x29, LVL_3, 4096 }, /* 8-way set assoc, sectored cache, 64 byte line size */
43 { 0x2c, LVL_1_DATA, 32 }, /* 8-way set assoc, 64 byte line size */
44 { 0x30, LVL_1_INST, 32 }, /* 8-way set assoc, 64 byte line size */
45 { 0x39, LVL_2, 128 }, /* 4-way set assoc, sectored cache, 64 byte line size */
46 { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
47 { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
48 { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
49 { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
50 { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
51 { 0x44, LVL_2, 1024 }, /* 4-way set assoc, 32 byte line size */
52 { 0x45, LVL_2, 2048 }, /* 4-way set assoc, 32 byte line size */
53 { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
54 { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
55 { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
56 { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
57 { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
58 { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
59 { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
60 { 0x78, LVL_2, 1024 }, /* 4-way set assoc, 64 byte line size */
61 { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
62 { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
63 { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
64 { 0x7c, LVL_2, 1024 }, /* 8-way set assoc, sectored cache, 64 byte line size */
65 { 0x7d, LVL_2, 2048 }, /* 8-way set assoc, 64 byte line size */
66 { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
67 { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
68 { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
69 { 0x84, LVL_2, 1024 }, /* 8-way set assoc, 32 byte line size */
70 { 0x85, LVL_2, 2048 }, /* 8-way set assoc, 32 byte line size */
71 { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
72 { 0x87, LVL_2, 1024 }, /* 8-way set assoc, 64 byte line size */
73 { 0x00, 0, 0}
74 };
75
76
77 enum _cache_type
78 {
79 CACHE_TYPE_NULL = 0,
80 CACHE_TYPE_DATA = 1,
81 CACHE_TYPE_INST = 2,
82 CACHE_TYPE_UNIFIED = 3
83 };
84
85 union _cpuid4_leaf_eax {
86 struct {
87 enum _cache_type type:5;
88 unsigned int level:3;
89 unsigned int is_self_initializing:1;
90 unsigned int is_fully_associative:1;
91 unsigned int reserved:4;
92 unsigned int num_threads_sharing:12;
93 unsigned int num_cores_on_die:6;
94 } split;
95 u32 full;
96 };
97
98 union _cpuid4_leaf_ebx {
99 struct {
100 unsigned int coherency_line_size:12;
101 unsigned int physical_line_partition:10;
102 unsigned int ways_of_associativity:10;
103 } split;
104 u32 full;
105 };
106
107 union _cpuid4_leaf_ecx {
108 struct {
109 unsigned int number_of_sets:32;
110 } split;
111 u32 full;
112 };
113
114 struct _cpuid4_info {
115 union _cpuid4_leaf_eax eax;
116 union _cpuid4_leaf_ebx ebx;
117 union _cpuid4_leaf_ecx ecx;
118 unsigned long size;
119 cpumask_t shared_cpu_map;
120 };
121
122 static unsigned short num_cache_leaves;
123
124 static int __cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
125 {
126 unsigned int eax, ebx, ecx, edx;
127 union _cpuid4_leaf_eax cache_eax;
128
129 cpuid_count(4, index, &eax, &ebx, &ecx, &edx);
130 cache_eax.full = eax;
131 if (cache_eax.split.type == CACHE_TYPE_NULL)
132 return -EIO; /* better error ? */
133
134 this_leaf->eax.full = eax;
135 this_leaf->ebx.full = ebx;
136 this_leaf->ecx.full = ecx;
137 this_leaf->size = (this_leaf->ecx.split.number_of_sets + 1) *
138 (this_leaf->ebx.split.coherency_line_size + 1) *
139 (this_leaf->ebx.split.physical_line_partition + 1) *
140 (this_leaf->ebx.split.ways_of_associativity + 1);
141 return 0;
142 }
143
144 static int __init find_num_cache_leaves(void)
145 {
146 unsigned int eax, ebx, ecx, edx;
147 union _cpuid4_leaf_eax cache_eax;
148 int i = -1;
149
150 do {
151 ++i;
152 /* Do cpuid(4) loop to find out num_cache_leaves */
153 cpuid_count(4, i, &eax, &ebx, &ecx, &edx);
154 cache_eax.full = eax;
155 } while (cache_eax.split.type != CACHE_TYPE_NULL);
156 return i;
157 }
158
159 unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
160 {
161 unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0; /* Cache sizes */
162 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
163 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
164
165 if (c->cpuid_level > 4) {
166 static int is_initialized;
167
168 if (is_initialized == 0) {
169 /* Init num_cache_leaves from boot CPU */
170 num_cache_leaves = find_num_cache_leaves();
171 is_initialized++;
172 }
173
174 /*
175 * Whenever possible use cpuid(4), deterministic cache
176 * parameters cpuid leaf to find the cache details
177 */
178 for (i = 0; i < num_cache_leaves; i++) {
179 struct _cpuid4_info this_leaf;
180
181 int retval;
182
183 retval = cpuid4_cache_lookup(i, &this_leaf);
184 if (retval >= 0) {
185 switch(this_leaf.eax.split.level) {
186 case 1:
187 if (this_leaf.eax.split.type ==
188 CACHE_TYPE_DATA)
189 new_l1d = this_leaf.size/1024;
190 else if (this_leaf.eax.split.type ==
191 CACHE_TYPE_INST)
192 new_l1i = this_leaf.size/1024;
193 break;
194 case 2:
195 new_l2 = this_leaf.size/1024;
196 break;
197 case 3:
198 new_l3 = this_leaf.size/1024;
199 break;
200 default:
201 break;
202 }
203 }
204 }
205 }
206 if (c->cpuid_level > 1) {
207 /* supports eax=2 call */
208 int i, j, n;
209 int regs[4];
210 unsigned char *dp = (unsigned char *)regs;
211
212 /* Number of times to iterate */
213 n = cpuid_eax(2) & 0xFF;
214
215 for ( i = 0 ; i < n ; i++ ) {
216 cpuid(2, &regs[0], &regs[1], &regs[2], &regs[3]);
217
218 /* If bit 31 is set, this is an unknown format */
219 for ( j = 0 ; j < 3 ; j++ ) {
220 if ( regs[j] < 0 ) regs[j] = 0;
221 }
222
223 /* Byte 0 is level count, not a descriptor */
224 for ( j = 1 ; j < 16 ; j++ ) {
225 unsigned char des = dp[j];
226 unsigned char k = 0;
227
228 /* look up this descriptor in the table */
229 while (cache_table[k].descriptor != 0)
230 {
231 if (cache_table[k].descriptor == des) {
232 switch (cache_table[k].cache_type) {
233 case LVL_1_INST:
234 l1i += cache_table[k].size;
235 break;
236 case LVL_1_DATA:
237 l1d += cache_table[k].size;
238 break;
239 case LVL_2:
240 l2 += cache_table[k].size;
241 break;
242 case LVL_3:
243 l3 += cache_table[k].size;
244 break;
245 case LVL_TRACE:
246 trace += cache_table[k].size;
247 break;
248 }
249
250 break;
251 }
252
253 k++;
254 }
255 }
256 }
257
258 if (new_l1d)
259 l1d = new_l1d;
260
261 if (new_l1i)
262 l1i = new_l1i;
263
264 if (new_l2)
265 l2 = new_l2;
266
267 if (new_l3)
268 l3 = new_l3;
269
270 if ( trace )
271 printk (KERN_INFO "CPU: Trace cache: %dK uops", trace);
272 else if ( l1i )
273 printk (KERN_INFO "CPU: L1 I cache: %dK", l1i);
274 if ( l1d )
275 printk(", L1 D cache: %dK\n", l1d);
276 else
277 printk("\n");
278 if ( l2 )
279 printk(KERN_INFO "CPU: L2 cache: %dK\n", l2);
280 if ( l3 )
281 printk(KERN_INFO "CPU: L3 cache: %dK\n", l3);
282
283 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
284 }
285
286 return l2;
287 }
288
289 /* pointer to _cpuid4_info array (for each cache leaf) */
290 static struct _cpuid4_info *cpuid4_info[NR_CPUS];
291 #define CPUID4_INFO_IDX(x,y) (&((cpuid4_info[x])[y]))
292
293 #ifdef CONFIG_SMP
294 static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
295 {
296 struct _cpuid4_info *this_leaf;
297 unsigned long num_threads_sharing;
298 #ifdef CONFIG_X86_HT
299 struct cpuinfo_x86 *c = cpu_data + cpu;
300 #endif
301
302 this_leaf = CPUID4_INFO_IDX(cpu, index);
303 num_threads_sharing = 1 + this_leaf->eax.split.num_threads_sharing;
304
305 if (num_threads_sharing == 1)
306 cpu_set(cpu, this_leaf->shared_cpu_map);
307 #ifdef CONFIG_X86_HT
308 else if (num_threads_sharing == smp_num_siblings)
309 this_leaf->shared_cpu_map = cpu_sibling_map[cpu];
310 else if (num_threads_sharing == (c->x86_num_cores * smp_num_siblings))
311 this_leaf->shared_cpu_map = cpu_core_map[cpu];
312 else
313 printk(KERN_DEBUG "Number of CPUs sharing cache didn't match "
314 "any known set of CPUs\n");
315 #endif
316 }
317 #else
318 static void __init cache_shared_cpu_map_setup(unsigned int cpu, int index) {}
319 #endif
320
321 static void free_cache_attributes(unsigned int cpu)
322 {
323 kfree(cpuid4_info[cpu]);
324 cpuid4_info[cpu] = NULL;
325 }
326
327 static int __cpuinit detect_cache_attributes(unsigned int cpu)
328 {
329 struct _cpuid4_info *this_leaf;
330 unsigned long j;
331 int retval;
332 cpumask_t oldmask;
333
334 if (num_cache_leaves == 0)
335 return -ENOENT;
336
337 cpuid4_info[cpu] = kmalloc(
338 sizeof(struct _cpuid4_info) * num_cache_leaves, GFP_KERNEL);
339 if (unlikely(cpuid4_info[cpu] == NULL))
340 return -ENOMEM;
341 memset(cpuid4_info[cpu], 0,
342 sizeof(struct _cpuid4_info) * num_cache_leaves);
343
344 oldmask = current->cpus_allowed;
345 retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
346 if (retval)
347 goto out;
348
349 /* Do cpuid and store the results */
350 retval = 0;
351 for (j = 0; j < num_cache_leaves; j++) {
352 this_leaf = CPUID4_INFO_IDX(cpu, j);
353 retval = cpuid4_cache_lookup(j, this_leaf);
354 if (unlikely(retval < 0))
355 break;
356 cache_shared_cpu_map_setup(cpu, j);
357 }
358 set_cpus_allowed(current, oldmask);
359
360 out:
361 if (retval)
362 free_cache_attributes(cpu);
363 return retval;
364 }
365
366 #ifdef CONFIG_SYSFS
367
368 #include <linux/kobject.h>
369 #include <linux/sysfs.h>
370
371 extern struct sysdev_class cpu_sysdev_class; /* from drivers/base/cpu.c */
372
373 /* pointer to kobject for cpuX/cache */
374 static struct kobject * cache_kobject[NR_CPUS];
375
376 struct _index_kobject {
377 struct kobject kobj;
378 unsigned int cpu;
379 unsigned short index;
380 };
381
382 /* pointer to array of kobjects for cpuX/cache/indexY */
383 static struct _index_kobject *index_kobject[NR_CPUS];
384 #define INDEX_KOBJECT_PTR(x,y) (&((index_kobject[x])[y]))
385
386 #define show_one_plus(file_name, object, val) \
387 static ssize_t show_##file_name \
388 (struct _cpuid4_info *this_leaf, char *buf) \
389 { \
390 return sprintf (buf, "%lu\n", (unsigned long)this_leaf->object + val); \
391 }
392
393 show_one_plus(level, eax.split.level, 0);
394 show_one_plus(coherency_line_size, ebx.split.coherency_line_size, 1);
395 show_one_plus(physical_line_partition, ebx.split.physical_line_partition, 1);
396 show_one_plus(ways_of_associativity, ebx.split.ways_of_associativity, 1);
397 show_one_plus(number_of_sets, ecx.split.number_of_sets, 1);
398
399 static ssize_t show_size(struct _cpuid4_info *this_leaf, char *buf)
400 {
401 return sprintf (buf, "%luK\n", this_leaf->size / 1024);
402 }
403
404 static ssize_t show_shared_cpu_map(struct _cpuid4_info *this_leaf, char *buf)
405 {
406 char mask_str[NR_CPUS];
407 cpumask_scnprintf(mask_str, NR_CPUS, this_leaf->shared_cpu_map);
408 return sprintf(buf, "%s\n", mask_str);
409 }
410
411 static ssize_t show_type(struct _cpuid4_info *this_leaf, char *buf) {
412 switch(this_leaf->eax.split.type) {
413 case CACHE_TYPE_DATA:
414 return sprintf(buf, "Data\n");
415 break;
416 case CACHE_TYPE_INST:
417 return sprintf(buf, "Instruction\n");
418 break;
419 case CACHE_TYPE_UNIFIED:
420 return sprintf(buf, "Unified\n");
421 break;
422 default:
423 return sprintf(buf, "Unknown\n");
424 break;
425 }
426 }
427
428 struct _cache_attr {
429 struct attribute attr;
430 ssize_t (*show)(struct _cpuid4_info *, char *);
431 ssize_t (*store)(struct _cpuid4_info *, const char *, size_t count);
432 };
433
434 #define define_one_ro(_name) \
435 static struct _cache_attr _name = \
436 __ATTR(_name, 0444, show_##_name, NULL)
437
438 define_one_ro(level);
439 define_one_ro(type);
440 define_one_ro(coherency_line_size);
441 define_one_ro(physical_line_partition);
442 define_one_ro(ways_of_associativity);
443 define_one_ro(number_of_sets);
444 define_one_ro(size);
445 define_one_ro(shared_cpu_map);
446
447 static struct attribute * default_attrs[] = {
448 &type.attr,
449 &level.attr,
450 &coherency_line_size.attr,
451 &physical_line_partition.attr,
452 &ways_of_associativity.attr,
453 &number_of_sets.attr,
454 &size.attr,
455 &shared_cpu_map.attr,
456 NULL
457 };
458
459 #define to_object(k) container_of(k, struct _index_kobject, kobj)
460 #define to_attr(a) container_of(a, struct _cache_attr, attr)
461
462 static ssize_t show(struct kobject * kobj, struct attribute * attr, char * buf)
463 {
464 struct _cache_attr *fattr = to_attr(attr);
465 struct _index_kobject *this_leaf = to_object(kobj);
466 ssize_t ret;
467
468 ret = fattr->show ?
469 fattr->show(CPUID4_INFO_IDX(this_leaf->cpu, this_leaf->index),
470 buf) :
471 0;
472 return ret;
473 }
474
475 static ssize_t store(struct kobject * kobj, struct attribute * attr,
476 const char * buf, size_t count)
477 {
478 return 0;
479 }
480
481 static struct sysfs_ops sysfs_ops = {
482 .show = show,
483 .store = store,
484 };
485
486 static struct kobj_type ktype_cache = {
487 .sysfs_ops = &sysfs_ops,
488 .default_attrs = default_attrs,
489 };
490
491 static struct kobj_type ktype_percpu_entry = {
492 .sysfs_ops = &sysfs_ops,
493 };
494
495 static void cpuid4_cache_sysfs_exit(unsigned int cpu)
496 {
497 kfree(cache_kobject[cpu]);
498 kfree(index_kobject[cpu]);
499 cache_kobject[cpu] = NULL;
500 index_kobject[cpu] = NULL;
501 free_cache_attributes(cpu);
502 }
503
504 static int __cpuinit cpuid4_cache_sysfs_init(unsigned int cpu)
505 {
506
507 if (num_cache_leaves == 0)
508 return -ENOENT;
509
510 detect_cache_attributes(cpu);
511 if (cpuid4_info[cpu] == NULL)
512 return -ENOENT;
513
514 /* Allocate all required memory */
515 cache_kobject[cpu] = kmalloc(sizeof(struct kobject), GFP_KERNEL);
516 if (unlikely(cache_kobject[cpu] == NULL))
517 goto err_out;
518 memset(cache_kobject[cpu], 0, sizeof(struct kobject));
519
520 index_kobject[cpu] = kmalloc(
521 sizeof(struct _index_kobject ) * num_cache_leaves, GFP_KERNEL);
522 if (unlikely(index_kobject[cpu] == NULL))
523 goto err_out;
524 memset(index_kobject[cpu], 0,
525 sizeof(struct _index_kobject) * num_cache_leaves);
526
527 return 0;
528
529 err_out:
530 cpuid4_cache_sysfs_exit(cpu);
531 return -ENOMEM;
532 }
533
534 /* Add/Remove cache interface for CPU device */
535 static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
536 {
537 unsigned int cpu = sys_dev->id;
538 unsigned long i, j;
539 struct _index_kobject *this_object;
540 int retval = 0;
541
542 retval = cpuid4_cache_sysfs_init(cpu);
543 if (unlikely(retval < 0))
544 return retval;
545
546 cache_kobject[cpu]->parent = &sys_dev->kobj;
547 kobject_set_name(cache_kobject[cpu], "%s", "cache");
548 cache_kobject[cpu]->ktype = &ktype_percpu_entry;
549 retval = kobject_register(cache_kobject[cpu]);
550
551 for (i = 0; i < num_cache_leaves; i++) {
552 this_object = INDEX_KOBJECT_PTR(cpu,i);
553 this_object->cpu = cpu;
554 this_object->index = i;
555 this_object->kobj.parent = cache_kobject[cpu];
556 kobject_set_name(&(this_object->kobj), "index%1lu", i);
557 this_object->kobj.ktype = &ktype_cache;
558 retval = kobject_register(&(this_object->kobj));
559 if (unlikely(retval)) {
560 for (j = 0; j < i; j++) {
561 kobject_unregister(
562 &(INDEX_KOBJECT_PTR(cpu,j)->kobj));
563 }
564 kobject_unregister(cache_kobject[cpu]);
565 cpuid4_cache_sysfs_exit(cpu);
566 break;
567 }
568 }
569 return retval;
570 }
571
572 static void __cpuexit cache_remove_dev(struct sys_device * sys_dev)
573 {
574 unsigned int cpu = sys_dev->id;
575 unsigned long i;
576
577 for (i = 0; i < num_cache_leaves; i++)
578 kobject_unregister(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
579 kobject_unregister(cache_kobject[cpu]);
580 cpuid4_cache_sysfs_exit(cpu);
581 return;
582 }
583
584 static int __cpuinit cacheinfo_cpu_callback(struct notifier_block *nfb,
585 unsigned long action, void *hcpu)
586 {
587 unsigned int cpu = (unsigned long)hcpu;
588 struct sys_device *sys_dev;
589
590 sys_dev = get_cpu_sysdev(cpu);
591 switch (action) {
592 case CPU_ONLINE:
593 cache_add_dev(sys_dev);
594 break;
595 case CPU_DEAD:
596 cache_remove_dev(sys_dev);
597 break;
598 }
599 return NOTIFY_OK;
600 }
601
602 static struct notifier_block cacheinfo_cpu_notifier =
603 {
604 .notifier_call = cacheinfo_cpu_callback,
605 };
606
607 static int __cpuinit cache_sysfs_init(void)
608 {
609 int i;
610
611 if (num_cache_leaves == 0)
612 return 0;
613
614 register_cpu_notifier(&cacheinfo_cpu_notifier);
615
616 for_each_online_cpu(i) {
617 cacheinfo_cpu_callback(&cacheinfo_cpu_notifier, CPU_ONLINE,
618 (void *)(long)i);
619 }
620
621 return 0;
622 }
623
624 device_initcall(cache_sysfs_init);
625
626 #endif
Linux kernel - Deliverables
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