2 * Routines to indentify caches on Intel CPU.
5 * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
6 * Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
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>
16 #include <asm/processor.h>
27 unsigned char descriptor;
32 /* all the cache descriptor types we care about (no TLB or trace cache entries) */
33 static struct _cache_table cache_table[] __cpuinitdata =
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 { 0x3a, LVL_2, 192 }, /* 6-way set assoc, sectored cache, 64 byte line size */
47 { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
48 { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
49 { 0x3d, LVL_2, 384 }, /* 6-way set assoc, sectored cache, 64 byte line size */
50 { 0x3e, LVL_2, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
51 { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
52 { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
53 { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
54 { 0x44, LVL_2, 1024 }, /* 4-way set assoc, 32 byte line size */
55 { 0x45, LVL_2, 2048 }, /* 4-way set assoc, 32 byte line size */
56 { 0x46, LVL_3, 4096 }, /* 4-way set assoc, 64 byte line size */
57 { 0x47, LVL_3, 8192 }, /* 8-way set assoc, 64 byte line size */
58 { 0x49, LVL_3, 4096 }, /* 16-way set assoc, 64 byte line size */
59 { 0x4a, LVL_3, 6144 }, /* 12-way set assoc, 64 byte line size */
60 { 0x4b, LVL_3, 8192 }, /* 16-way set assoc, 64 byte line size */
61 { 0x4c, LVL_3, 12288 }, /* 12-way set assoc, 64 byte line size */
62 { 0x4d, LVL_3, 16384 }, /* 16-way set assoc, 64 byte line size */
63 { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
64 { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
65 { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
66 { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
67 { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
68 { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
69 { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
70 { 0x73, LVL_TRACE, 64 }, /* 8-way set assoc */
71 { 0x78, LVL_2, 1024 }, /* 4-way set assoc, 64 byte line size */
72 { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
73 { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
74 { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
75 { 0x7c, LVL_2, 1024 }, /* 8-way set assoc, sectored cache, 64 byte line size */
76 { 0x7d, LVL_2, 2048 }, /* 8-way set assoc, 64 byte line size */
77 { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
78 { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
79 { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
80 { 0x84, LVL_2, 1024 }, /* 8-way set assoc, 32 byte line size */
81 { 0x85, LVL_2, 2048 }, /* 8-way set assoc, 32 byte line size */
82 { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
83 { 0x87, LVL_2, 1024 }, /* 8-way set assoc, 64 byte line size */
93 CACHE_TYPE_UNIFIED = 3
96 union _cpuid4_leaf_eax {
98 enum _cache_type type:5;
100 unsigned int is_self_initializing:1;
101 unsigned int is_fully_associative:1;
102 unsigned int reserved:4;
103 unsigned int num_threads_sharing:12;
104 unsigned int num_cores_on_die:6;
109 union _cpuid4_leaf_ebx {
111 unsigned int coherency_line_size:12;
112 unsigned int physical_line_partition:10;
113 unsigned int ways_of_associativity:10;
118 union _cpuid4_leaf_ecx {
120 unsigned int number_of_sets:32;
125 struct _cpuid4_info {
126 union _cpuid4_leaf_eax eax;
127 union _cpuid4_leaf_ebx ebx;
128 union _cpuid4_leaf_ecx ecx;
130 cpumask_t shared_cpu_map;
133 static unsigned short num_cache_leaves;
135 static int __cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
137 unsigned int eax, ebx, ecx, edx;
138 union _cpuid4_leaf_eax cache_eax;
140 cpuid_count(4, index, &eax, &ebx, &ecx, &edx);
141 cache_eax.full = eax;
142 if (cache_eax.split.type == CACHE_TYPE_NULL)
143 return -EIO; /* better error ? */
145 this_leaf->eax.full = eax;
146 this_leaf->ebx.full = ebx;
147 this_leaf->ecx.full = ecx;
148 this_leaf->size = (this_leaf->ecx.split.number_of_sets + 1) *
149 (this_leaf->ebx.split.coherency_line_size + 1) *
150 (this_leaf->ebx.split.physical_line_partition + 1) *
151 (this_leaf->ebx.split.ways_of_associativity + 1);
155 static int __init find_num_cache_leaves(void)
157 unsigned int eax, ebx, ecx, edx;
158 union _cpuid4_leaf_eax cache_eax;
163 /* Do cpuid(4) loop to find out num_cache_leaves */
164 cpuid_count(4, i, &eax, &ebx, &ecx, &edx);
165 cache_eax.full = eax;
166 } while (cache_eax.split.type != CACHE_TYPE_NULL);
170 unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
172 unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0; /* Cache sizes */
173 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
174 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
176 if (c->cpuid_level > 4) {
177 static int is_initialized;
179 if (is_initialized == 0) {
180 /* Init num_cache_leaves from boot CPU */
181 num_cache_leaves = find_num_cache_leaves();
186 * Whenever possible use cpuid(4), deterministic cache
187 * parameters cpuid leaf to find the cache details
189 for (i = 0; i < num_cache_leaves; i++) {
190 struct _cpuid4_info this_leaf;
194 retval = cpuid4_cache_lookup(i, &this_leaf);
196 switch(this_leaf.eax.split.level) {
198 if (this_leaf.eax.split.type ==
200 new_l1d = this_leaf.size/1024;
201 else if (this_leaf.eax.split.type ==
203 new_l1i = this_leaf.size/1024;
206 new_l2 = this_leaf.size/1024;
209 new_l3 = this_leaf.size/1024;
217 if (c->cpuid_level > 1) {
218 /* supports eax=2 call */
221 unsigned char *dp = (unsigned char *)regs;
223 /* Number of times to iterate */
224 n = cpuid_eax(2) & 0xFF;
226 for ( i = 0 ; i < n ; i++ ) {
227 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
229 /* If bit 31 is set, this is an unknown format */
230 for ( j = 0 ; j < 3 ; j++ ) {
231 if ( regs[j] < 0 ) regs[j] = 0;
234 /* Byte 0 is level count, not a descriptor */
235 for ( j = 1 ; j < 16 ; j++ ) {
236 unsigned char des = dp[j];
239 /* look up this descriptor in the table */
240 while (cache_table[k].descriptor != 0)
242 if (cache_table[k].descriptor == des) {
243 switch (cache_table[k].cache_type) {
245 l1i += cache_table[k].size;
248 l1d += cache_table[k].size;
251 l2 += cache_table[k].size;
254 l3 += cache_table[k].size;
257 trace += cache_table[k].size;
282 printk (KERN_INFO "CPU: Trace cache: %dK uops", trace);
284 printk (KERN_INFO "CPU: L1 I cache: %dK", l1i);
286 printk(", L1 D cache: %dK\n", l1d);
290 printk(KERN_INFO "CPU: L2 cache: %dK\n", l2);
292 printk(KERN_INFO "CPU: L3 cache: %dK\n", l3);
294 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
300 /* pointer to _cpuid4_info array (for each cache leaf) */
301 static struct _cpuid4_info *cpuid4_info[NR_CPUS];
302 #define CPUID4_INFO_IDX(x,y) (&((cpuid4_info[x])[y]))
305 static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
307 struct _cpuid4_info *this_leaf, *sibling_leaf;
308 unsigned long num_threads_sharing;
310 struct cpuinfo_x86 *c = cpu_data;
312 this_leaf = CPUID4_INFO_IDX(cpu, index);
313 num_threads_sharing = 1 + this_leaf->eax.split.num_threads_sharing;
315 if (num_threads_sharing == 1)
316 cpu_set(cpu, this_leaf->shared_cpu_map);
318 index_msb = get_count_order(num_threads_sharing);
320 for_each_online_cpu(i) {
321 if (c[i].apicid >> index_msb ==
322 c[cpu].apicid >> index_msb) {
323 cpu_set(i, this_leaf->shared_cpu_map);
324 if (i != cpu && cpuid4_info[i]) {
325 sibling_leaf = CPUID4_INFO_IDX(i, index);
326 cpu_set(cpu, sibling_leaf->shared_cpu_map);
332 static void __devinit cache_remove_shared_cpu_map(unsigned int cpu, int index)
334 struct _cpuid4_info *this_leaf, *sibling_leaf;
337 this_leaf = CPUID4_INFO_IDX(cpu, index);
338 for_each_cpu_mask(sibling, this_leaf->shared_cpu_map) {
339 sibling_leaf = CPUID4_INFO_IDX(sibling, index);
340 cpu_clear(cpu, sibling_leaf->shared_cpu_map);
344 static void __init cache_shared_cpu_map_setup(unsigned int cpu, int index) {}
345 static void __init cache_remove_shared_cpu_map(unsigned int cpu, int index) {}
348 static void free_cache_attributes(unsigned int cpu)
350 kfree(cpuid4_info[cpu]);
351 cpuid4_info[cpu] = NULL;
354 static int __cpuinit detect_cache_attributes(unsigned int cpu)
356 struct _cpuid4_info *this_leaf;
361 if (num_cache_leaves == 0)
364 cpuid4_info[cpu] = kmalloc(
365 sizeof(struct _cpuid4_info) * num_cache_leaves, GFP_KERNEL);
366 if (unlikely(cpuid4_info[cpu] == NULL))
368 memset(cpuid4_info[cpu], 0,
369 sizeof(struct _cpuid4_info) * num_cache_leaves);
371 oldmask = current->cpus_allowed;
372 retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
376 /* Do cpuid and store the results */
378 for (j = 0; j < num_cache_leaves; j++) {
379 this_leaf = CPUID4_INFO_IDX(cpu, j);
380 retval = cpuid4_cache_lookup(j, this_leaf);
381 if (unlikely(retval < 0))
383 cache_shared_cpu_map_setup(cpu, j);
385 set_cpus_allowed(current, oldmask);
389 free_cache_attributes(cpu);
395 #include <linux/kobject.h>
396 #include <linux/sysfs.h>
398 extern struct sysdev_class cpu_sysdev_class; /* from drivers/base/cpu.c */
400 /* pointer to kobject for cpuX/cache */
401 static struct kobject * cache_kobject[NR_CPUS];
403 struct _index_kobject {
406 unsigned short index;
409 /* pointer to array of kobjects for cpuX/cache/indexY */
410 static struct _index_kobject *index_kobject[NR_CPUS];
411 #define INDEX_KOBJECT_PTR(x,y) (&((index_kobject[x])[y]))
413 #define show_one_plus(file_name, object, val) \
414 static ssize_t show_##file_name \
415 (struct _cpuid4_info *this_leaf, char *buf) \
417 return sprintf (buf, "%lu\n", (unsigned long)this_leaf->object + val); \
420 show_one_plus(level, eax.split.level, 0);
421 show_one_plus(coherency_line_size, ebx.split.coherency_line_size, 1);
422 show_one_plus(physical_line_partition, ebx.split.physical_line_partition, 1);
423 show_one_plus(ways_of_associativity, ebx.split.ways_of_associativity, 1);
424 show_one_plus(number_of_sets, ecx.split.number_of_sets, 1);
426 static ssize_t show_size(struct _cpuid4_info *this_leaf, char *buf)
428 return sprintf (buf, "%luK\n", this_leaf->size / 1024);
431 static ssize_t show_shared_cpu_map(struct _cpuid4_info *this_leaf, char *buf)
433 char mask_str[NR_CPUS];
434 cpumask_scnprintf(mask_str, NR_CPUS, this_leaf->shared_cpu_map);
435 return sprintf(buf, "%s\n", mask_str);
438 static ssize_t show_type(struct _cpuid4_info *this_leaf, char *buf) {
439 switch(this_leaf->eax.split.type) {
440 case CACHE_TYPE_DATA:
441 return sprintf(buf, "Data\n");
443 case CACHE_TYPE_INST:
444 return sprintf(buf, "Instruction\n");
446 case CACHE_TYPE_UNIFIED:
447 return sprintf(buf, "Unified\n");
450 return sprintf(buf, "Unknown\n");
456 struct attribute attr;
457 ssize_t (*show)(struct _cpuid4_info *, char *);
458 ssize_t (*store)(struct _cpuid4_info *, const char *, size_t count);
461 #define define_one_ro(_name) \
462 static struct _cache_attr _name = \
463 __ATTR(_name, 0444, show_##_name, NULL)
465 define_one_ro(level);
467 define_one_ro(coherency_line_size);
468 define_one_ro(physical_line_partition);
469 define_one_ro(ways_of_associativity);
470 define_one_ro(number_of_sets);
472 define_one_ro(shared_cpu_map);
474 static struct attribute * default_attrs[] = {
477 &coherency_line_size.attr,
478 &physical_line_partition.attr,
479 &ways_of_associativity.attr,
480 &number_of_sets.attr,
482 &shared_cpu_map.attr,
486 #define to_object(k) container_of(k, struct _index_kobject, kobj)
487 #define to_attr(a) container_of(a, struct _cache_attr, attr)
489 static ssize_t show(struct kobject * kobj, struct attribute * attr, char * buf)
491 struct _cache_attr *fattr = to_attr(attr);
492 struct _index_kobject *this_leaf = to_object(kobj);
496 fattr->show(CPUID4_INFO_IDX(this_leaf->cpu, this_leaf->index),
502 static ssize_t store(struct kobject * kobj, struct attribute * attr,
503 const char * buf, size_t count)
508 static struct sysfs_ops sysfs_ops = {
513 static struct kobj_type ktype_cache = {
514 .sysfs_ops = &sysfs_ops,
515 .default_attrs = default_attrs,
518 static struct kobj_type ktype_percpu_entry = {
519 .sysfs_ops = &sysfs_ops,
522 static void cpuid4_cache_sysfs_exit(unsigned int cpu)
524 kfree(cache_kobject[cpu]);
525 kfree(index_kobject[cpu]);
526 cache_kobject[cpu] = NULL;
527 index_kobject[cpu] = NULL;
528 free_cache_attributes(cpu);
531 static int __cpuinit cpuid4_cache_sysfs_init(unsigned int cpu)
534 if (num_cache_leaves == 0)
537 detect_cache_attributes(cpu);
538 if (cpuid4_info[cpu] == NULL)
541 /* Allocate all required memory */
542 cache_kobject[cpu] = kmalloc(sizeof(struct kobject), GFP_KERNEL);
543 if (unlikely(cache_kobject[cpu] == NULL))
545 memset(cache_kobject[cpu], 0, sizeof(struct kobject));
547 index_kobject[cpu] = kmalloc(
548 sizeof(struct _index_kobject ) * num_cache_leaves, GFP_KERNEL);
549 if (unlikely(index_kobject[cpu] == NULL))
551 memset(index_kobject[cpu], 0,
552 sizeof(struct _index_kobject) * num_cache_leaves);
557 cpuid4_cache_sysfs_exit(cpu);
561 /* Add/Remove cache interface for CPU device */
562 static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
564 unsigned int cpu = sys_dev->id;
566 struct _index_kobject *this_object;
569 retval = cpuid4_cache_sysfs_init(cpu);
570 if (unlikely(retval < 0))
573 cache_kobject[cpu]->parent = &sys_dev->kobj;
574 kobject_set_name(cache_kobject[cpu], "%s", "cache");
575 cache_kobject[cpu]->ktype = &ktype_percpu_entry;
576 retval = kobject_register(cache_kobject[cpu]);
578 for (i = 0; i < num_cache_leaves; i++) {
579 this_object = INDEX_KOBJECT_PTR(cpu,i);
580 this_object->cpu = cpu;
581 this_object->index = i;
582 this_object->kobj.parent = cache_kobject[cpu];
583 kobject_set_name(&(this_object->kobj), "index%1lu", i);
584 this_object->kobj.ktype = &ktype_cache;
585 retval = kobject_register(&(this_object->kobj));
586 if (unlikely(retval)) {
587 for (j = 0; j < i; j++) {
589 &(INDEX_KOBJECT_PTR(cpu,j)->kobj));
591 kobject_unregister(cache_kobject[cpu]);
592 cpuid4_cache_sysfs_exit(cpu);
599 static void __cpuexit cache_remove_dev(struct sys_device * sys_dev)
601 unsigned int cpu = sys_dev->id;
604 for (i = 0; i < num_cache_leaves; i++) {
605 cache_remove_shared_cpu_map(cpu, i);
606 kobject_unregister(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
608 kobject_unregister(cache_kobject[cpu]);
609 cpuid4_cache_sysfs_exit(cpu);
613 static int __cpuinit cacheinfo_cpu_callback(struct notifier_block *nfb,
614 unsigned long action, void *hcpu)
616 unsigned int cpu = (unsigned long)hcpu;
617 struct sys_device *sys_dev;
619 sys_dev = get_cpu_sysdev(cpu);
622 cache_add_dev(sys_dev);
625 cache_remove_dev(sys_dev);
631 static struct notifier_block cacheinfo_cpu_notifier =
633 .notifier_call = cacheinfo_cpu_callback,
636 static int __cpuinit cache_sysfs_init(void)
640 if (num_cache_leaves == 0)
643 register_cpu_notifier(&cacheinfo_cpu_notifier);
645 for_each_online_cpu(i) {
646 cacheinfo_cpu_callback(&cacheinfo_cpu_notifier, CPU_ONLINE,
653 device_initcall(cache_sysfs_init);