1 // SPDX-License-Identifier: GPL-2.0
3 * Routines to identify caches on Intel CPU.
6 * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
8 * Andi Kleen / Andreas Herrmann : CPUID4 emulation on AMD.
11 #include <linux/slab.h>
12 #include <linux/cacheinfo.h>
13 #include <linux/cpu.h>
14 #include <linux/sched.h>
15 #include <linux/capability.h>
16 #include <linux/sysfs.h>
17 #include <linux/pci.h>
19 #include <asm/cpufeature.h>
20 #include <asm/cacheinfo.h>
21 #include <asm/amd_nb.h>
33 unsigned char descriptor;
38 #define MB(x) ((x) * 1024)
40 /* All the cache descriptor types we care about (no TLB or
41 trace cache entries) */
43 static const struct _cache_table cache_table[] =
45 { 0x06, LVL_1_INST, 8 }, /* 4-way set assoc, 32 byte line size */
46 { 0x08, LVL_1_INST, 16 }, /* 4-way set assoc, 32 byte line size */
47 { 0x09, LVL_1_INST, 32 }, /* 4-way set assoc, 64 byte line size */
48 { 0x0a, LVL_1_DATA, 8 }, /* 2 way set assoc, 32 byte line size */
49 { 0x0c, LVL_1_DATA, 16 }, /* 4-way set assoc, 32 byte line size */
50 { 0x0d, LVL_1_DATA, 16 }, /* 4-way set assoc, 64 byte line size */
51 { 0x0e, LVL_1_DATA, 24 }, /* 6-way set assoc, 64 byte line size */
52 { 0x21, LVL_2, 256 }, /* 8-way set assoc, 64 byte line size */
53 { 0x22, LVL_3, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
54 { 0x23, LVL_3, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
55 { 0x25, LVL_3, MB(2) }, /* 8-way set assoc, sectored cache, 64 byte line size */
56 { 0x29, LVL_3, MB(4) }, /* 8-way set assoc, sectored cache, 64 byte line size */
57 { 0x2c, LVL_1_DATA, 32 }, /* 8-way set assoc, 64 byte line size */
58 { 0x30, LVL_1_INST, 32 }, /* 8-way set assoc, 64 byte line size */
59 { 0x39, LVL_2, 128 }, /* 4-way set assoc, sectored cache, 64 byte line size */
60 { 0x3a, LVL_2, 192 }, /* 6-way set assoc, sectored cache, 64 byte line size */
61 { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
62 { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
63 { 0x3d, LVL_2, 384 }, /* 6-way set assoc, sectored cache, 64 byte line size */
64 { 0x3e, LVL_2, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
65 { 0x3f, LVL_2, 256 }, /* 2-way set assoc, 64 byte line size */
66 { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
67 { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
68 { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
69 { 0x44, LVL_2, MB(1) }, /* 4-way set assoc, 32 byte line size */
70 { 0x45, LVL_2, MB(2) }, /* 4-way set assoc, 32 byte line size */
71 { 0x46, LVL_3, MB(4) }, /* 4-way set assoc, 64 byte line size */
72 { 0x47, LVL_3, MB(8) }, /* 8-way set assoc, 64 byte line size */
73 { 0x48, LVL_2, MB(3) }, /* 12-way set assoc, 64 byte line size */
74 { 0x49, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
75 { 0x4a, LVL_3, MB(6) }, /* 12-way set assoc, 64 byte line size */
76 { 0x4b, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
77 { 0x4c, LVL_3, MB(12) }, /* 12-way set assoc, 64 byte line size */
78 { 0x4d, LVL_3, MB(16) }, /* 16-way set assoc, 64 byte line size */
79 { 0x4e, LVL_2, MB(6) }, /* 24-way set assoc, 64 byte line size */
80 { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
81 { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
82 { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
83 { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
84 { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
85 { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
86 { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
87 { 0x73, LVL_TRACE, 64 }, /* 8-way set assoc */
88 { 0x78, LVL_2, MB(1) }, /* 4-way set assoc, 64 byte line size */
89 { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
90 { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
91 { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
92 { 0x7c, LVL_2, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
93 { 0x7d, LVL_2, MB(2) }, /* 8-way set assoc, 64 byte line size */
94 { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
95 { 0x80, LVL_2, 512 }, /* 8-way set assoc, 64 byte line size */
96 { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
97 { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
98 { 0x84, LVL_2, MB(1) }, /* 8-way set assoc, 32 byte line size */
99 { 0x85, LVL_2, MB(2) }, /* 8-way set assoc, 32 byte line size */
100 { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
101 { 0x87, LVL_2, MB(1) }, /* 8-way set assoc, 64 byte line size */
102 { 0xd0, LVL_3, 512 }, /* 4-way set assoc, 64 byte line size */
103 { 0xd1, LVL_3, MB(1) }, /* 4-way set assoc, 64 byte line size */
104 { 0xd2, LVL_3, MB(2) }, /* 4-way set assoc, 64 byte line size */
105 { 0xd6, LVL_3, MB(1) }, /* 8-way set assoc, 64 byte line size */
106 { 0xd7, LVL_3, MB(2) }, /* 8-way set assoc, 64 byte line size */
107 { 0xd8, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
108 { 0xdc, LVL_3, MB(2) }, /* 12-way set assoc, 64 byte line size */
109 { 0xdd, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
110 { 0xde, LVL_3, MB(8) }, /* 12-way set assoc, 64 byte line size */
111 { 0xe2, LVL_3, MB(2) }, /* 16-way set assoc, 64 byte line size */
112 { 0xe3, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
113 { 0xe4, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
114 { 0xea, LVL_3, MB(12) }, /* 24-way set assoc, 64 byte line size */
115 { 0xeb, LVL_3, MB(18) }, /* 24-way set assoc, 64 byte line size */
116 { 0xec, LVL_3, MB(24) }, /* 24-way set assoc, 64 byte line size */
128 union _cpuid4_leaf_eax {
130 enum _cache_type type:5;
131 unsigned int level:3;
132 unsigned int is_self_initializing:1;
133 unsigned int is_fully_associative:1;
134 unsigned int reserved:4;
135 unsigned int num_threads_sharing:12;
136 unsigned int num_cores_on_die:6;
141 union _cpuid4_leaf_ebx {
143 unsigned int coherency_line_size:12;
144 unsigned int physical_line_partition:10;
145 unsigned int ways_of_associativity:10;
150 union _cpuid4_leaf_ecx {
152 unsigned int number_of_sets:32;
157 struct _cpuid4_info_regs {
158 union _cpuid4_leaf_eax eax;
159 union _cpuid4_leaf_ebx ebx;
160 union _cpuid4_leaf_ecx ecx;
163 struct amd_northbridge *nb;
166 static unsigned short num_cache_leaves;
168 /* AMD doesn't have CPUID4. Emulate it here to report the same
169 information to the user. This makes some assumptions about the machine:
170 L2 not shared, no SMT etc. that is currently true on AMD CPUs.
172 In theory the TLBs could be reported as fake type (they are in "dummy").
176 unsigned line_size:8;
177 unsigned lines_per_tag:8;
179 unsigned size_in_kb:8;
186 unsigned line_size:8;
187 unsigned lines_per_tag:4;
189 unsigned size_in_kb:16;
196 unsigned line_size:8;
197 unsigned lines_per_tag:4;
200 unsigned size_encoded:14;
205 static const unsigned short assocs[] = {
216 [0xf] = 0xffff /* fully associative - no way to show this currently */
219 static const unsigned char levels[] = { 1, 1, 2, 3 };
220 static const unsigned char types[] = { 1, 2, 3, 3 };
222 static const enum cache_type cache_type_map[] = {
223 [CTYPE_NULL] = CACHE_TYPE_NOCACHE,
224 [CTYPE_DATA] = CACHE_TYPE_DATA,
225 [CTYPE_INST] = CACHE_TYPE_INST,
226 [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
230 amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
231 union _cpuid4_leaf_ebx *ebx,
232 union _cpuid4_leaf_ecx *ecx)
235 unsigned line_size, lines_per_tag, assoc, size_in_kb;
236 union l1_cache l1i, l1d;
239 union l1_cache *l1 = &l1d;
245 cpuid(0x80000005, &dummy, &dummy, &l1d.val, &l1i.val);
246 cpuid(0x80000006, &dummy, &dummy, &l2.val, &l3.val);
255 assoc = assocs[l1->assoc];
256 line_size = l1->line_size;
257 lines_per_tag = l1->lines_per_tag;
258 size_in_kb = l1->size_in_kb;
263 assoc = assocs[l2.assoc];
264 line_size = l2.line_size;
265 lines_per_tag = l2.lines_per_tag;
266 /* cpu_data has errata corrections for K7 applied */
267 size_in_kb = __this_cpu_read(cpu_info.x86_cache_size);
272 assoc = assocs[l3.assoc];
273 line_size = l3.line_size;
274 lines_per_tag = l3.lines_per_tag;
275 size_in_kb = l3.size_encoded * 512;
276 if (boot_cpu_has(X86_FEATURE_AMD_DCM)) {
277 size_in_kb = size_in_kb >> 1;
285 eax->split.is_self_initializing = 1;
286 eax->split.type = types[leaf];
287 eax->split.level = levels[leaf];
288 eax->split.num_threads_sharing = 0;
289 eax->split.num_cores_on_die = __this_cpu_read(cpu_info.x86_max_cores) - 1;
293 eax->split.is_fully_associative = 1;
294 ebx->split.coherency_line_size = line_size - 1;
295 ebx->split.ways_of_associativity = assoc - 1;
296 ebx->split.physical_line_partition = lines_per_tag - 1;
297 ecx->split.number_of_sets = (size_in_kb * 1024) / line_size /
298 (ebx->split.ways_of_associativity + 1) - 1;
301 #if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
304 * L3 cache descriptors
306 static void amd_calc_l3_indices(struct amd_northbridge *nb)
308 struct amd_l3_cache *l3 = &nb->l3_cache;
309 unsigned int sc0, sc1, sc2, sc3;
312 pci_read_config_dword(nb->misc, 0x1C4, &val);
314 /* calculate subcache sizes */
315 l3->subcaches[0] = sc0 = !(val & BIT(0));
316 l3->subcaches[1] = sc1 = !(val & BIT(4));
318 if (boot_cpu_data.x86 == 0x15) {
319 l3->subcaches[0] = sc0 += !(val & BIT(1));
320 l3->subcaches[1] = sc1 += !(val & BIT(5));
323 l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
324 l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
326 l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
330 * check whether a slot used for disabling an L3 index is occupied.
331 * @l3: L3 cache descriptor
332 * @slot: slot number (0..1)
334 * @returns: the disabled index if used or negative value if slot free.
336 static int amd_get_l3_disable_slot(struct amd_northbridge *nb, unsigned slot)
338 unsigned int reg = 0;
340 pci_read_config_dword(nb->misc, 0x1BC + slot * 4, ®);
342 /* check whether this slot is activated already */
343 if (reg & (3UL << 30))
349 static ssize_t show_cache_disable(struct cacheinfo *this_leaf, char *buf,
353 struct amd_northbridge *nb = this_leaf->priv;
355 index = amd_get_l3_disable_slot(nb, slot);
357 return sprintf(buf, "%d\n", index);
359 return sprintf(buf, "FREE\n");
362 #define SHOW_CACHE_DISABLE(slot) \
364 cache_disable_##slot##_show(struct device *dev, \
365 struct device_attribute *attr, char *buf) \
367 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
368 return show_cache_disable(this_leaf, buf, slot); \
370 SHOW_CACHE_DISABLE(0)
371 SHOW_CACHE_DISABLE(1)
373 static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
374 unsigned slot, unsigned long idx)
381 * disable index in all 4 subcaches
383 for (i = 0; i < 4; i++) {
384 u32 reg = idx | (i << 20);
386 if (!nb->l3_cache.subcaches[i])
389 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
392 * We need to WBINVD on a core on the node containing the L3
393 * cache which indices we disable therefore a simple wbinvd()
399 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
404 * disable a L3 cache index by using a disable-slot
406 * @l3: L3 cache descriptor
407 * @cpu: A CPU on the node containing the L3 cache
408 * @slot: slot number (0..1)
409 * @index: index to disable
411 * @return: 0 on success, error status on failure
413 static int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu,
414 unsigned slot, unsigned long index)
418 /* check if @slot is already used or the index is already disabled */
419 ret = amd_get_l3_disable_slot(nb, slot);
423 if (index > nb->l3_cache.indices)
426 /* check whether the other slot has disabled the same index already */
427 if (index == amd_get_l3_disable_slot(nb, !slot))
430 amd_l3_disable_index(nb, cpu, slot, index);
435 static ssize_t store_cache_disable(struct cacheinfo *this_leaf,
436 const char *buf, size_t count,
439 unsigned long val = 0;
441 struct amd_northbridge *nb = this_leaf->priv;
443 if (!capable(CAP_SYS_ADMIN))
446 cpu = cpumask_first(&this_leaf->shared_cpu_map);
448 if (kstrtoul(buf, 10, &val) < 0)
451 err = amd_set_l3_disable_slot(nb, cpu, slot, val);
454 pr_warn("L3 slot %d in use/index already disabled!\n",
461 #define STORE_CACHE_DISABLE(slot) \
463 cache_disable_##slot##_store(struct device *dev, \
464 struct device_attribute *attr, \
465 const char *buf, size_t count) \
467 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
468 return store_cache_disable(this_leaf, buf, count, slot); \
470 STORE_CACHE_DISABLE(0)
471 STORE_CACHE_DISABLE(1)
473 static ssize_t subcaches_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
476 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
477 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
479 return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
482 static ssize_t subcaches_store(struct device *dev,
483 struct device_attribute *attr,
484 const char *buf, size_t count)
486 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
487 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
490 if (!capable(CAP_SYS_ADMIN))
493 if (kstrtoul(buf, 16, &val) < 0)
496 if (amd_set_subcaches(cpu, val))
502 static DEVICE_ATTR_RW(cache_disable_0);
503 static DEVICE_ATTR_RW(cache_disable_1);
504 static DEVICE_ATTR_RW(subcaches);
507 cache_private_attrs_is_visible(struct kobject *kobj,
508 struct attribute *attr, int unused)
510 struct device *dev = kobj_to_dev(kobj);
511 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
512 umode_t mode = attr->mode;
514 if (!this_leaf->priv)
517 if ((attr == &dev_attr_subcaches.attr) &&
518 amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
521 if ((attr == &dev_attr_cache_disable_0.attr ||
522 attr == &dev_attr_cache_disable_1.attr) &&
523 amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
529 static struct attribute_group cache_private_group = {
530 .is_visible = cache_private_attrs_is_visible,
533 static void init_amd_l3_attrs(void)
536 static struct attribute **amd_l3_attrs;
538 if (amd_l3_attrs) /* already initialized */
541 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
543 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
546 amd_l3_attrs = kcalloc(n, sizeof(*amd_l3_attrs), GFP_KERNEL);
551 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE)) {
552 amd_l3_attrs[n++] = &dev_attr_cache_disable_0.attr;
553 amd_l3_attrs[n++] = &dev_attr_cache_disable_1.attr;
555 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
556 amd_l3_attrs[n++] = &dev_attr_subcaches.attr;
558 cache_private_group.attrs = amd_l3_attrs;
561 const struct attribute_group *
562 cache_get_priv_group(struct cacheinfo *this_leaf)
564 struct amd_northbridge *nb = this_leaf->priv;
566 if (this_leaf->level < 3 || !nb)
569 if (nb && nb->l3_cache.indices)
572 return &cache_private_group;
575 static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
579 /* only for L3, and not in virtualized environments */
583 node = amd_get_nb_id(smp_processor_id());
584 this_leaf->nb = node_to_amd_nb(node);
585 if (this_leaf->nb && !this_leaf->nb->l3_cache.indices)
586 amd_calc_l3_indices(this_leaf->nb);
589 #define amd_init_l3_cache(x, y)
590 #endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
593 cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
595 union _cpuid4_leaf_eax eax;
596 union _cpuid4_leaf_ebx ebx;
597 union _cpuid4_leaf_ecx ecx;
600 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
601 if (boot_cpu_has(X86_FEATURE_TOPOEXT))
602 cpuid_count(0x8000001d, index, &eax.full,
603 &ebx.full, &ecx.full, &edx);
605 amd_cpuid4(index, &eax, &ebx, &ecx);
606 amd_init_l3_cache(this_leaf, index);
607 } else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
608 cpuid_count(0x8000001d, index, &eax.full,
609 &ebx.full, &ecx.full, &edx);
610 amd_init_l3_cache(this_leaf, index);
612 cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
615 if (eax.split.type == CTYPE_NULL)
616 return -EIO; /* better error ? */
618 this_leaf->eax = eax;
619 this_leaf->ebx = ebx;
620 this_leaf->ecx = ecx;
621 this_leaf->size = (ecx.split.number_of_sets + 1) *
622 (ebx.split.coherency_line_size + 1) *
623 (ebx.split.physical_line_partition + 1) *
624 (ebx.split.ways_of_associativity + 1);
628 static int find_num_cache_leaves(struct cpuinfo_x86 *c)
630 unsigned int eax, ebx, ecx, edx, op;
631 union _cpuid4_leaf_eax cache_eax;
634 if (c->x86_vendor == X86_VENDOR_AMD ||
635 c->x86_vendor == X86_VENDOR_HYGON)
642 /* Do cpuid(op) loop to find out num_cache_leaves */
643 cpuid_count(op, i, &eax, &ebx, &ecx, &edx);
644 cache_eax.full = eax;
645 } while (cache_eax.split.type != CTYPE_NULL);
649 void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, int cpu, u8 node_id)
652 * We may have multiple LLCs if L3 caches exist, so check if we
653 * have an L3 cache by looking at the L3 cache CPUID leaf.
655 if (!cpuid_edx(0x80000006))
659 /* LLC is at the node level. */
660 per_cpu(cpu_llc_id, cpu) = node_id;
661 } else if (c->x86 == 0x17 &&
662 c->x86_model >= 0 && c->x86_model <= 0x1F) {
664 * LLC is at the core complex level.
665 * Core complex ID is ApicId[3] for these processors.
667 per_cpu(cpu_llc_id, cpu) = c->apicid >> 3;
670 * LLC ID is calculated from the number of threads sharing the
673 u32 eax, ebx, ecx, edx, num_sharing_cache = 0;
674 u32 llc_index = find_num_cache_leaves(c) - 1;
676 cpuid_count(0x8000001d, llc_index, &eax, &ebx, &ecx, &edx);
678 num_sharing_cache = ((eax >> 14) & 0xfff) + 1;
680 if (num_sharing_cache) {
681 int bits = get_count_order(num_sharing_cache);
683 per_cpu(cpu_llc_id, cpu) = c->apicid >> bits;
688 void cacheinfo_hygon_init_llc_id(struct cpuinfo_x86 *c, int cpu, u8 node_id)
691 * We may have multiple LLCs if L3 caches exist, so check if we
692 * have an L3 cache by looking at the L3 cache CPUID leaf.
694 if (!cpuid_edx(0x80000006))
698 * LLC is at the core complex level.
699 * Core complex ID is ApicId[3] for these processors.
701 per_cpu(cpu_llc_id, cpu) = c->apicid >> 3;
704 void init_amd_cacheinfo(struct cpuinfo_x86 *c)
707 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
708 num_cache_leaves = find_num_cache_leaves(c);
709 } else if (c->extended_cpuid_level >= 0x80000006) {
710 if (cpuid_edx(0x80000006) & 0xf000)
711 num_cache_leaves = 4;
713 num_cache_leaves = 3;
717 void init_hygon_cacheinfo(struct cpuinfo_x86 *c)
719 num_cache_leaves = find_num_cache_leaves(c);
722 void init_intel_cacheinfo(struct cpuinfo_x86 *c)
725 unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0;
726 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
727 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
728 unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
730 unsigned int cpu = c->cpu_index;
733 if (c->cpuid_level > 3) {
734 static int is_initialized;
736 if (is_initialized == 0) {
737 /* Init num_cache_leaves from boot CPU */
738 num_cache_leaves = find_num_cache_leaves(c);
743 * Whenever possible use cpuid(4), deterministic cache
744 * parameters cpuid leaf to find the cache details
746 for (i = 0; i < num_cache_leaves; i++) {
747 struct _cpuid4_info_regs this_leaf = {};
750 retval = cpuid4_cache_lookup_regs(i, &this_leaf);
754 switch (this_leaf.eax.split.level) {
756 if (this_leaf.eax.split.type == CTYPE_DATA)
757 new_l1d = this_leaf.size/1024;
758 else if (this_leaf.eax.split.type == CTYPE_INST)
759 new_l1i = this_leaf.size/1024;
762 new_l2 = this_leaf.size/1024;
763 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
764 index_msb = get_count_order(num_threads_sharing);
765 l2_id = c->apicid & ~((1 << index_msb) - 1);
768 new_l3 = this_leaf.size/1024;
769 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
770 index_msb = get_count_order(num_threads_sharing);
771 l3_id = c->apicid & ~((1 << index_msb) - 1);
779 * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
782 if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
783 /* supports eax=2 call */
785 unsigned int regs[4];
786 unsigned char *dp = (unsigned char *)regs;
789 if (num_cache_leaves != 0 && c->x86 == 15)
792 /* Number of times to iterate */
793 n = cpuid_eax(2) & 0xFF;
795 for (i = 0 ; i < n ; i++) {
796 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
798 /* If bit 31 is set, this is an unknown format */
799 for (j = 0 ; j < 3 ; j++)
800 if (regs[j] & (1 << 31))
803 /* Byte 0 is level count, not a descriptor */
804 for (j = 1 ; j < 16 ; j++) {
805 unsigned char des = dp[j];
808 /* look up this descriptor in the table */
809 while (cache_table[k].descriptor != 0) {
810 if (cache_table[k].descriptor == des) {
811 if (only_trace && cache_table[k].cache_type != LVL_TRACE)
813 switch (cache_table[k].cache_type) {
815 l1i += cache_table[k].size;
818 l1d += cache_table[k].size;
821 l2 += cache_table[k].size;
824 l3 += cache_table[k].size;
827 trace += cache_table[k].size;
849 per_cpu(cpu_llc_id, cpu) = l2_id;
856 per_cpu(cpu_llc_id, cpu) = l3_id;
862 * If cpu_llc_id is not yet set, this means cpuid_level < 4 which in
863 * turns means that the only possibility is SMT (as indicated in
864 * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
865 * that SMT shares all caches, we can unconditionally set cpu_llc_id to
868 if (per_cpu(cpu_llc_id, cpu) == BAD_APICID)
869 per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
872 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
875 cpu_detect_cache_sizes(c);
878 static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
879 struct _cpuid4_info_regs *base)
881 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
882 struct cacheinfo *this_leaf;
886 * For L3, always use the pre-calculated cpu_llc_shared_mask
887 * to derive shared_cpu_map.
890 for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
891 this_cpu_ci = get_cpu_cacheinfo(i);
892 if (!this_cpu_ci->info_list)
894 this_leaf = this_cpu_ci->info_list + index;
895 for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
896 if (!cpu_online(sibling))
898 cpumask_set_cpu(sibling,
899 &this_leaf->shared_cpu_map);
902 } else if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
903 unsigned int apicid, nshared, first, last;
905 nshared = base->eax.split.num_threads_sharing + 1;
906 apicid = cpu_data(cpu).apicid;
907 first = apicid - (apicid % nshared);
908 last = first + nshared - 1;
910 for_each_online_cpu(i) {
911 this_cpu_ci = get_cpu_cacheinfo(i);
912 if (!this_cpu_ci->info_list)
915 apicid = cpu_data(i).apicid;
916 if ((apicid < first) || (apicid > last))
919 this_leaf = this_cpu_ci->info_list + index;
921 for_each_online_cpu(sibling) {
922 apicid = cpu_data(sibling).apicid;
923 if ((apicid < first) || (apicid > last))
925 cpumask_set_cpu(sibling,
926 &this_leaf->shared_cpu_map);
935 static void __cache_cpumap_setup(unsigned int cpu, int index,
936 struct _cpuid4_info_regs *base)
938 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
939 struct cacheinfo *this_leaf, *sibling_leaf;
940 unsigned long num_threads_sharing;
942 struct cpuinfo_x86 *c = &cpu_data(cpu);
944 if (c->x86_vendor == X86_VENDOR_AMD ||
945 c->x86_vendor == X86_VENDOR_HYGON) {
946 if (__cache_amd_cpumap_setup(cpu, index, base))
950 this_leaf = this_cpu_ci->info_list + index;
951 num_threads_sharing = 1 + base->eax.split.num_threads_sharing;
953 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
954 if (num_threads_sharing == 1)
957 index_msb = get_count_order(num_threads_sharing);
959 for_each_online_cpu(i)
960 if (cpu_data(i).apicid >> index_msb == c->apicid >> index_msb) {
961 struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
963 if (i == cpu || !sib_cpu_ci->info_list)
964 continue;/* skip if itself or no cacheinfo */
965 sibling_leaf = sib_cpu_ci->info_list + index;
966 cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
967 cpumask_set_cpu(cpu, &sibling_leaf->shared_cpu_map);
971 static void ci_leaf_init(struct cacheinfo *this_leaf,
972 struct _cpuid4_info_regs *base)
974 this_leaf->id = base->id;
975 this_leaf->attributes = CACHE_ID;
976 this_leaf->level = base->eax.split.level;
977 this_leaf->type = cache_type_map[base->eax.split.type];
978 this_leaf->coherency_line_size =
979 base->ebx.split.coherency_line_size + 1;
980 this_leaf->ways_of_associativity =
981 base->ebx.split.ways_of_associativity + 1;
982 this_leaf->size = base->size;
983 this_leaf->number_of_sets = base->ecx.split.number_of_sets + 1;
984 this_leaf->physical_line_partition =
985 base->ebx.split.physical_line_partition + 1;
986 this_leaf->priv = base->nb;
989 static int __init_cache_level(unsigned int cpu)
991 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
993 if (!num_cache_leaves)
997 this_cpu_ci->num_levels = 3;
998 this_cpu_ci->num_leaves = num_cache_leaves;
1003 * The max shared threads number comes from CPUID.4:EAX[25-14] with input
1004 * ECX as cache index. Then right shift apicid by the number's order to get
1005 * cache id for this cache node.
1007 static void get_cache_id(int cpu, struct _cpuid4_info_regs *id4_regs)
1009 struct cpuinfo_x86 *c = &cpu_data(cpu);
1010 unsigned long num_threads_sharing;
1013 num_threads_sharing = 1 + id4_regs->eax.split.num_threads_sharing;
1014 index_msb = get_count_order(num_threads_sharing);
1015 id4_regs->id = c->apicid >> index_msb;
1018 static int __populate_cache_leaves(unsigned int cpu)
1020 unsigned int idx, ret;
1021 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
1022 struct cacheinfo *this_leaf = this_cpu_ci->info_list;
1023 struct _cpuid4_info_regs id4_regs = {};
1025 for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
1026 ret = cpuid4_cache_lookup_regs(idx, &id4_regs);
1029 get_cache_id(cpu, &id4_regs);
1030 ci_leaf_init(this_leaf++, &id4_regs);
1031 __cache_cpumap_setup(cpu, idx, &id4_regs);
1033 this_cpu_ci->cpu_map_populated = true;
1038 DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
1039 DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)