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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Routines to identify caches on Intel CPU.
4 *
5 * Changes:
6 * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
7 * Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
8 * Andi Kleen / Andreas Herrmann : CPUID4 emulation on AMD.
9 */
10
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>
18
19#include <asm/cpufeature.h>
20#include <asm/cacheinfo.h>
21#include <asm/amd_nb.h>
22#include <asm/smp.h>
23
24#include "cpu.h"
25
26#define LVL_1_INST 1
27#define LVL_1_DATA 2
28#define LVL_2 3
29#define LVL_3 4
30#define LVL_TRACE 5
31
32struct _cache_table {
33 unsigned char descriptor;
34 char cache_type;
35 short size;
36};
37
38#define MB(x) ((x) * 1024)
39
40/* All the cache descriptor types we care about (no TLB or
41 trace cache entries) */
42
43static const struct _cache_table cache_table[] =
44{
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 */
117 { 0x00, 0, 0}
118};
119
120
121enum _cache_type {
122 CTYPE_NULL = 0,
123 CTYPE_DATA = 1,
124 CTYPE_INST = 2,
125 CTYPE_UNIFIED = 3
126};
127
128union _cpuid4_leaf_eax {
129 struct {
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;
137 } split;
138 u32 full;
139};
140
141union _cpuid4_leaf_ebx {
142 struct {
143 unsigned int coherency_line_size:12;
144 unsigned int physical_line_partition:10;
145 unsigned int ways_of_associativity:10;
146 } split;
147 u32 full;
148};
149
150union _cpuid4_leaf_ecx {
151 struct {
152 unsigned int number_of_sets:32;
153 } split;
154 u32 full;
155};
156
157struct _cpuid4_info_regs {
158 union _cpuid4_leaf_eax eax;
159 union _cpuid4_leaf_ebx ebx;
160 union _cpuid4_leaf_ecx ecx;
161 unsigned int id;
162 unsigned long size;
163 struct amd_northbridge *nb;
164};
165
166static unsigned short num_cache_leaves;
167
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.
171
172 In theory the TLBs could be reported as fake type (they are in "dummy").
173 Maybe later */
174union l1_cache {
175 struct {
176 unsigned line_size:8;
177 unsigned lines_per_tag:8;
178 unsigned assoc:8;
179 unsigned size_in_kb:8;
180 };
181 unsigned val;
182};
183
184union l2_cache {
185 struct {
186 unsigned line_size:8;
187 unsigned lines_per_tag:4;
188 unsigned assoc:4;
189 unsigned size_in_kb:16;
190 };
191 unsigned val;
192};
193
194union l3_cache {
195 struct {
196 unsigned line_size:8;
197 unsigned lines_per_tag:4;
198 unsigned assoc:4;
199 unsigned res:2;
200 unsigned size_encoded:14;
201 };
202 unsigned val;
203};
204
205static const unsigned short assocs[] = {
206 [1] = 1,
207 [2] = 2,
208 [4] = 4,
209 [6] = 8,
210 [8] = 16,
211 [0xa] = 32,
212 [0xb] = 48,
213 [0xc] = 64,
214 [0xd] = 96,
215 [0xe] = 128,
216 [0xf] = 0xffff /* fully associative - no way to show this currently */
217};
218
219static const unsigned char levels[] = { 1, 1, 2, 3 };
220static const unsigned char types[] = { 1, 2, 3, 3 };
221
222static 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,
227};
228
229static void
230amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
231 union _cpuid4_leaf_ebx *ebx,
232 union _cpuid4_leaf_ecx *ecx)
233{
234 unsigned dummy;
235 unsigned line_size, lines_per_tag, assoc, size_in_kb;
236 union l1_cache l1i, l1d;
237 union l2_cache l2;
238 union l3_cache l3;
239 union l1_cache *l1 = &l1d;
240
241 eax->full = 0;
242 ebx->full = 0;
243 ecx->full = 0;
244
245 cpuid(0x80000005, &dummy, &dummy, &l1d.val, &l1i.val);
246 cpuid(0x80000006, &dummy, &dummy, &l2.val, &l3.val);
247
248 switch (leaf) {
249 case 1:
250 l1 = &l1i;
251 /* fall through */
252 case 0:
253 if (!l1->val)
254 return;
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;
259 break;
260 case 2:
261 if (!l2.val)
262 return;
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);
268 break;
269 case 3:
270 if (!l3.val)
271 return;
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;
278 assoc = assoc >> 1;
279 }
280 break;
281 default:
282 return;
283 }
284
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;
290
291
292 if (assoc == 0xffff)
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;
299}
300
301#if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
302
303/*
304 * L3 cache descriptors
305 */
306static void amd_calc_l3_indices(struct amd_northbridge *nb)
307{
308 struct amd_l3_cache *l3 = &nb->l3_cache;
309 unsigned int sc0, sc1, sc2, sc3;
310 u32 val = 0;
311
312 pci_read_config_dword(nb->misc, 0x1C4, &val);
313
314 /* calculate subcache sizes */
315 l3->subcaches[0] = sc0 = !(val & BIT(0));
316 l3->subcaches[1] = sc1 = !(val & BIT(4));
317
318 if (boot_cpu_data.x86 == 0x15) {
319 l3->subcaches[0] = sc0 += !(val & BIT(1));
320 l3->subcaches[1] = sc1 += !(val & BIT(5));
321 }
322
323 l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
324 l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
325
326 l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
327}
328
329/*
330 * check whether a slot used for disabling an L3 index is occupied.
331 * @l3: L3 cache descriptor
332 * @slot: slot number (0..1)
333 *
334 * @returns: the disabled index if used or negative value if slot free.
335 */
336static int amd_get_l3_disable_slot(struct amd_northbridge *nb, unsigned slot)
337{
338 unsigned int reg = 0;
339
340 pci_read_config_dword(nb->misc, 0x1BC + slot * 4, ®);
341
342 /* check whether this slot is activated already */
343 if (reg & (3UL << 30))
344 return reg & 0xfff;
345
346 return -1;
347}
348
349static ssize_t show_cache_disable(struct cacheinfo *this_leaf, char *buf,
350 unsigned int slot)
351{
352 int index;
353 struct amd_northbridge *nb = this_leaf->priv;
354
355 index = amd_get_l3_disable_slot(nb, slot);
356 if (index >= 0)
357 return sprintf(buf, "%d\n", index);
358
359 return sprintf(buf, "FREE\n");
360}
361
362#define SHOW_CACHE_DISABLE(slot) \
363static ssize_t \
364cache_disable_##slot##_show(struct device *dev, \
365 struct device_attribute *attr, char *buf) \
366{ \
367 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
368 return show_cache_disable(this_leaf, buf, slot); \
369}
370SHOW_CACHE_DISABLE(0)
371SHOW_CACHE_DISABLE(1)
372
373static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
374 unsigned slot, unsigned long idx)
375{
376 int i;
377
378 idx |= BIT(30);
379
380 /*
381 * disable index in all 4 subcaches
382 */
383 for (i = 0; i < 4; i++) {
384 u32 reg = idx | (i << 20);
385
386 if (!nb->l3_cache.subcaches[i])
387 continue;
388
389 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
390
391 /*
392 * We need to WBINVD on a core on the node containing the L3
393 * cache which indices we disable therefore a simple wbinvd()
394 * is not sufficient.
395 */
396 wbinvd_on_cpu(cpu);
397
398 reg |= BIT(31);
399 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
400 }
401}
402
403/*
404 * disable a L3 cache index by using a disable-slot
405 *
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
410 *
411 * @return: 0 on success, error status on failure
412 */
413static int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu,
414 unsigned slot, unsigned long index)
415{
416 int ret = 0;
417
418 /* check if @slot is already used or the index is already disabled */
419 ret = amd_get_l3_disable_slot(nb, slot);
420 if (ret >= 0)
421 return -EEXIST;
422
423 if (index > nb->l3_cache.indices)
424 return -EINVAL;
425
426 /* check whether the other slot has disabled the same index already */
427 if (index == amd_get_l3_disable_slot(nb, !slot))
428 return -EEXIST;
429
430 amd_l3_disable_index(nb, cpu, slot, index);
431
432 return 0;
433}
434
435static ssize_t store_cache_disable(struct cacheinfo *this_leaf,
436 const char *buf, size_t count,
437 unsigned int slot)
438{
439 unsigned long val = 0;
440 int cpu, err = 0;
441 struct amd_northbridge *nb = this_leaf->priv;
442
443 if (!capable(CAP_SYS_ADMIN))
444 return -EPERM;
445
446 cpu = cpumask_first(&this_leaf->shared_cpu_map);
447
448 if (kstrtoul(buf, 10, &val) < 0)
449 return -EINVAL;
450
451 err = amd_set_l3_disable_slot(nb, cpu, slot, val);
452 if (err) {
453 if (err == -EEXIST)
454 pr_warn("L3 slot %d in use/index already disabled!\n",
455 slot);
456 return err;
457 }
458 return count;
459}
460
461#define STORE_CACHE_DISABLE(slot) \
462static ssize_t \
463cache_disable_##slot##_store(struct device *dev, \
464 struct device_attribute *attr, \
465 const char *buf, size_t count) \
466{ \
467 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
468 return store_cache_disable(this_leaf, buf, count, slot); \
469}
470STORE_CACHE_DISABLE(0)
471STORE_CACHE_DISABLE(1)
472
473static ssize_t subcaches_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475{
476 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
477 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
478
479 return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
480}
481
482static ssize_t subcaches_store(struct device *dev,
483 struct device_attribute *attr,
484 const char *buf, size_t count)
485{
486 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
487 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
488 unsigned long val;
489
490 if (!capable(CAP_SYS_ADMIN))
491 return -EPERM;
492
493 if (kstrtoul(buf, 16, &val) < 0)
494 return -EINVAL;
495
496 if (amd_set_subcaches(cpu, val))
497 return -EINVAL;
498
499 return count;
500}
501
502static DEVICE_ATTR_RW(cache_disable_0);
503static DEVICE_ATTR_RW(cache_disable_1);
504static DEVICE_ATTR_RW(subcaches);
505
506static umode_t
507cache_private_attrs_is_visible(struct kobject *kobj,
508 struct attribute *attr, int unused)
509{
510 struct device *dev = kobj_to_dev(kobj);
511 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
512 umode_t mode = attr->mode;
513
514 if (!this_leaf->priv)
515 return 0;
516
517 if ((attr == &dev_attr_subcaches.attr) &&
518 amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
519 return mode;
520
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))
524 return mode;
525
526 return 0;
527}
528
529static struct attribute_group cache_private_group = {
530 .is_visible = cache_private_attrs_is_visible,
531};
532
533static void init_amd_l3_attrs(void)
534{
535 int n = 1;
536 static struct attribute **amd_l3_attrs;
537
538 if (amd_l3_attrs) /* already initialized */
539 return;
540
541 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
542 n += 2;
543 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
544 n += 1;
545
546 amd_l3_attrs = kcalloc(n, sizeof(*amd_l3_attrs), GFP_KERNEL);
547 if (!amd_l3_attrs)
548 return;
549
550 n = 0;
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;
554 }
555 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
556 amd_l3_attrs[n++] = &dev_attr_subcaches.attr;
557
558 cache_private_group.attrs = amd_l3_attrs;
559}
560
561const struct attribute_group *
562cache_get_priv_group(struct cacheinfo *this_leaf)
563{
564 struct amd_northbridge *nb = this_leaf->priv;
565
566 if (this_leaf->level < 3 || !nb)
567 return NULL;
568
569 if (nb && nb->l3_cache.indices)
570 init_amd_l3_attrs();
571
572 return &cache_private_group;
573}
574
575static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
576{
577 int node;
578
579 /* only for L3, and not in virtualized environments */
580 if (index < 3)
581 return;
582
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);
587}
588#else
589#define amd_init_l3_cache(x, y)
590#endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
591
592static int
593cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
594{
595 union _cpuid4_leaf_eax eax;
596 union _cpuid4_leaf_ebx ebx;
597 union _cpuid4_leaf_ecx ecx;
598 unsigned edx;
599
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);
604 else
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);
611 } else {
612 cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
613 }
614
615 if (eax.split.type == CTYPE_NULL)
616 return -EIO; /* better error ? */
617
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);
625 return 0;
626}
627
628static int find_num_cache_leaves(struct cpuinfo_x86 *c)
629{
630 unsigned int eax, ebx, ecx, edx, op;
631 union _cpuid4_leaf_eax cache_eax;
632 int i = -1;
633
634 if (c->x86_vendor == X86_VENDOR_AMD ||
635 c->x86_vendor == X86_VENDOR_HYGON)
636 op = 0x8000001d;
637 else
638 op = 4;
639
640 do {
641 ++i;
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);
646 return i;
647}
648
649void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, int cpu, u8 node_id)
650{
651 /*
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.
654 */
655 if (!cpuid_edx(0x80000006))
656 return;
657
658 if (c->x86 < 0x17) {
659 /* LLC is at the node level. */
660 per_cpu(cpu_llc_id, cpu) = node_id;
661 } else if (c->x86 == 0x17 && c->x86_model <= 0x1F) {
662 /*
663 * LLC is at the core complex level.
664 * Core complex ID is ApicId[3] for these processors.
665 */
666 per_cpu(cpu_llc_id, cpu) = c->apicid >> 3;
667 } else {
668 /*
669 * LLC ID is calculated from the number of threads sharing the
670 * cache.
671 * */
672 u32 eax, ebx, ecx, edx, num_sharing_cache = 0;
673 u32 llc_index = find_num_cache_leaves(c) - 1;
674
675 cpuid_count(0x8000001d, llc_index, &eax, &ebx, &ecx, &edx);
676 if (eax)
677 num_sharing_cache = ((eax >> 14) & 0xfff) + 1;
678
679 if (num_sharing_cache) {
680 int bits = get_count_order(num_sharing_cache);
681
682 per_cpu(cpu_llc_id, cpu) = c->apicid >> bits;
683 }
684 }
685}
686
687void cacheinfo_hygon_init_llc_id(struct cpuinfo_x86 *c, int cpu, u8 node_id)
688{
689 /*
690 * We may have multiple LLCs if L3 caches exist, so check if we
691 * have an L3 cache by looking at the L3 cache CPUID leaf.
692 */
693 if (!cpuid_edx(0x80000006))
694 return;
695
696 /*
697 * LLC is at the core complex level.
698 * Core complex ID is ApicId[3] for these processors.
699 */
700 per_cpu(cpu_llc_id, cpu) = c->apicid >> 3;
701}
702
703void init_amd_cacheinfo(struct cpuinfo_x86 *c)
704{
705
706 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
707 num_cache_leaves = find_num_cache_leaves(c);
708 } else if (c->extended_cpuid_level >= 0x80000006) {
709 if (cpuid_edx(0x80000006) & 0xf000)
710 num_cache_leaves = 4;
711 else
712 num_cache_leaves = 3;
713 }
714}
715
716void init_hygon_cacheinfo(struct cpuinfo_x86 *c)
717{
718 num_cache_leaves = find_num_cache_leaves(c);
719}
720
721void init_intel_cacheinfo(struct cpuinfo_x86 *c)
722{
723 /* Cache sizes */
724 unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0;
725 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
726 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
727 unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
728#ifdef CONFIG_SMP
729 unsigned int cpu = c->cpu_index;
730#endif
731
732 if (c->cpuid_level > 3) {
733 static int is_initialized;
734
735 if (is_initialized == 0) {
736 /* Init num_cache_leaves from boot CPU */
737 num_cache_leaves = find_num_cache_leaves(c);
738 is_initialized++;
739 }
740
741 /*
742 * Whenever possible use cpuid(4), deterministic cache
743 * parameters cpuid leaf to find the cache details
744 */
745 for (i = 0; i < num_cache_leaves; i++) {
746 struct _cpuid4_info_regs this_leaf = {};
747 int retval;
748
749 retval = cpuid4_cache_lookup_regs(i, &this_leaf);
750 if (retval < 0)
751 continue;
752
753 switch (this_leaf.eax.split.level) {
754 case 1:
755 if (this_leaf.eax.split.type == CTYPE_DATA)
756 new_l1d = this_leaf.size/1024;
757 else if (this_leaf.eax.split.type == CTYPE_INST)
758 new_l1i = this_leaf.size/1024;
759 break;
760 case 2:
761 new_l2 = this_leaf.size/1024;
762 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
763 index_msb = get_count_order(num_threads_sharing);
764 l2_id = c->apicid & ~((1 << index_msb) - 1);
765 break;
766 case 3:
767 new_l3 = this_leaf.size/1024;
768 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
769 index_msb = get_count_order(num_threads_sharing);
770 l3_id = c->apicid & ~((1 << index_msb) - 1);
771 break;
772 default:
773 break;
774 }
775 }
776 }
777 /*
778 * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
779 * trace cache
780 */
781 if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
782 /* supports eax=2 call */
783 int j, n;
784 unsigned int regs[4];
785 unsigned char *dp = (unsigned char *)regs;
786 int only_trace = 0;
787
788 if (num_cache_leaves != 0 && c->x86 == 15)
789 only_trace = 1;
790
791 /* Number of times to iterate */
792 n = cpuid_eax(2) & 0xFF;
793
794 for (i = 0 ; i < n ; i++) {
795 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
796
797 /* If bit 31 is set, this is an unknown format */
798 for (j = 0 ; j < 3 ; j++)
799 if (regs[j] & (1 << 31))
800 regs[j] = 0;
801
802 /* Byte 0 is level count, not a descriptor */
803 for (j = 1 ; j < 16 ; j++) {
804 unsigned char des = dp[j];
805 unsigned char k = 0;
806
807 /* look up this descriptor in the table */
808 while (cache_table[k].descriptor != 0) {
809 if (cache_table[k].descriptor == des) {
810 if (only_trace && cache_table[k].cache_type != LVL_TRACE)
811 break;
812 switch (cache_table[k].cache_type) {
813 case LVL_1_INST:
814 l1i += cache_table[k].size;
815 break;
816 case LVL_1_DATA:
817 l1d += cache_table[k].size;
818 break;
819 case LVL_2:
820 l2 += cache_table[k].size;
821 break;
822 case LVL_3:
823 l3 += cache_table[k].size;
824 break;
825 case LVL_TRACE:
826 trace += cache_table[k].size;
827 break;
828 }
829
830 break;
831 }
832
833 k++;
834 }
835 }
836 }
837 }
838
839 if (new_l1d)
840 l1d = new_l1d;
841
842 if (new_l1i)
843 l1i = new_l1i;
844
845 if (new_l2) {
846 l2 = new_l2;
847#ifdef CONFIG_SMP
848 per_cpu(cpu_llc_id, cpu) = l2_id;
849#endif
850 }
851
852 if (new_l3) {
853 l3 = new_l3;
854#ifdef CONFIG_SMP
855 per_cpu(cpu_llc_id, cpu) = l3_id;
856#endif
857 }
858
859#ifdef CONFIG_SMP
860 /*
861 * If cpu_llc_id is not yet set, this means cpuid_level < 4 which in
862 * turns means that the only possibility is SMT (as indicated in
863 * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
864 * that SMT shares all caches, we can unconditionally set cpu_llc_id to
865 * c->phys_proc_id.
866 */
867 if (per_cpu(cpu_llc_id, cpu) == BAD_APICID)
868 per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
869#endif
870
871 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
872
873 if (!l2)
874 cpu_detect_cache_sizes(c);
875}
876
877static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
878 struct _cpuid4_info_regs *base)
879{
880 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
881 struct cacheinfo *this_leaf;
882 int i, sibling;
883
884 /*
885 * For L3, always use the pre-calculated cpu_llc_shared_mask
886 * to derive shared_cpu_map.
887 */
888 if (index == 3) {
889 for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
890 this_cpu_ci = get_cpu_cacheinfo(i);
891 if (!this_cpu_ci->info_list)
892 continue;
893 this_leaf = this_cpu_ci->info_list + index;
894 for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
895 if (!cpu_online(sibling))
896 continue;
897 cpumask_set_cpu(sibling,
898 &this_leaf->shared_cpu_map);
899 }
900 }
901 } else if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
902 unsigned int apicid, nshared, first, last;
903
904 nshared = base->eax.split.num_threads_sharing + 1;
905 apicid = cpu_data(cpu).apicid;
906 first = apicid - (apicid % nshared);
907 last = first + nshared - 1;
908
909 for_each_online_cpu(i) {
910 this_cpu_ci = get_cpu_cacheinfo(i);
911 if (!this_cpu_ci->info_list)
912 continue;
913
914 apicid = cpu_data(i).apicid;
915 if ((apicid < first) || (apicid > last))
916 continue;
917
918 this_leaf = this_cpu_ci->info_list + index;
919
920 for_each_online_cpu(sibling) {
921 apicid = cpu_data(sibling).apicid;
922 if ((apicid < first) || (apicid > last))
923 continue;
924 cpumask_set_cpu(sibling,
925 &this_leaf->shared_cpu_map);
926 }
927 }
928 } else
929 return 0;
930
931 return 1;
932}
933
934static void __cache_cpumap_setup(unsigned int cpu, int index,
935 struct _cpuid4_info_regs *base)
936{
937 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
938 struct cacheinfo *this_leaf, *sibling_leaf;
939 unsigned long num_threads_sharing;
940 int index_msb, i;
941 struct cpuinfo_x86 *c = &cpu_data(cpu);
942
943 if (c->x86_vendor == X86_VENDOR_AMD ||
944 c->x86_vendor == X86_VENDOR_HYGON) {
945 if (__cache_amd_cpumap_setup(cpu, index, base))
946 return;
947 }
948
949 this_leaf = this_cpu_ci->info_list + index;
950 num_threads_sharing = 1 + base->eax.split.num_threads_sharing;
951
952 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
953 if (num_threads_sharing == 1)
954 return;
955
956 index_msb = get_count_order(num_threads_sharing);
957
958 for_each_online_cpu(i)
959 if (cpu_data(i).apicid >> index_msb == c->apicid >> index_msb) {
960 struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
961
962 if (i == cpu || !sib_cpu_ci->info_list)
963 continue;/* skip if itself or no cacheinfo */
964 sibling_leaf = sib_cpu_ci->info_list + index;
965 cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
966 cpumask_set_cpu(cpu, &sibling_leaf->shared_cpu_map);
967 }
968}
969
970static void ci_leaf_init(struct cacheinfo *this_leaf,
971 struct _cpuid4_info_regs *base)
972{
973 this_leaf->id = base->id;
974 this_leaf->attributes = CACHE_ID;
975 this_leaf->level = base->eax.split.level;
976 this_leaf->type = cache_type_map[base->eax.split.type];
977 this_leaf->coherency_line_size =
978 base->ebx.split.coherency_line_size + 1;
979 this_leaf->ways_of_associativity =
980 base->ebx.split.ways_of_associativity + 1;
981 this_leaf->size = base->size;
982 this_leaf->number_of_sets = base->ecx.split.number_of_sets + 1;
983 this_leaf->physical_line_partition =
984 base->ebx.split.physical_line_partition + 1;
985 this_leaf->priv = base->nb;
986}
987
988static int __init_cache_level(unsigned int cpu)
989{
990 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
991
992 if (!num_cache_leaves)
993 return -ENOENT;
994 if (!this_cpu_ci)
995 return -EINVAL;
996 this_cpu_ci->num_levels = 3;
997 this_cpu_ci->num_leaves = num_cache_leaves;
998 return 0;
999}
1000
1001/*
1002 * The max shared threads number comes from CPUID.4:EAX[25-14] with input
1003 * ECX as cache index. Then right shift apicid by the number's order to get
1004 * cache id for this cache node.
1005 */
1006static void get_cache_id(int cpu, struct _cpuid4_info_regs *id4_regs)
1007{
1008 struct cpuinfo_x86 *c = &cpu_data(cpu);
1009 unsigned long num_threads_sharing;
1010 int index_msb;
1011
1012 num_threads_sharing = 1 + id4_regs->eax.split.num_threads_sharing;
1013 index_msb = get_count_order(num_threads_sharing);
1014 id4_regs->id = c->apicid >> index_msb;
1015}
1016
1017static int __populate_cache_leaves(unsigned int cpu)
1018{
1019 unsigned int idx, ret;
1020 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
1021 struct cacheinfo *this_leaf = this_cpu_ci->info_list;
1022 struct _cpuid4_info_regs id4_regs = {};
1023
1024 for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
1025 ret = cpuid4_cache_lookup_regs(idx, &id4_regs);
1026 if (ret)
1027 return ret;
1028 get_cache_id(cpu, &id4_regs);
1029 ci_leaf_init(this_leaf++, &id4_regs);
1030 __cache_cpumap_setup(cpu, idx, &id4_regs);
1031 }
1032 this_cpu_ci->cpu_map_populated = true;
1033
1034 return 0;
1035}
1036
1037DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
1038DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Routines to identify caches on Intel CPU.
4 *
5 * Changes:
6 * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
7 * Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
8 * Andi Kleen / Andreas Herrmann : CPUID4 emulation on AMD.
9 */
10
11#include <linux/slab.h>
12#include <linux/cacheinfo.h>
13#include <linux/cpu.h>
14#include <linux/cpuhotplug.h>
15#include <linux/sched.h>
16#include <linux/capability.h>
17#include <linux/sysfs.h>
18#include <linux/pci.h>
19#include <linux/stop_machine.h>
20
21#include <asm/cpufeature.h>
22#include <asm/cacheinfo.h>
23#include <asm/amd_nb.h>
24#include <asm/smp.h>
25#include <asm/mtrr.h>
26#include <asm/tlbflush.h>
27
28#include "cpu.h"
29
30#define LVL_1_INST 1
31#define LVL_1_DATA 2
32#define LVL_2 3
33#define LVL_3 4
34#define LVL_TRACE 5
35
36/* Shared last level cache maps */
37DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
38
39/* Shared L2 cache maps */
40DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_l2c_shared_map);
41
42static cpumask_var_t cpu_cacheinfo_mask;
43
44/* Kernel controls MTRR and/or PAT MSRs. */
45unsigned int memory_caching_control __ro_after_init;
46
47struct _cache_table {
48 unsigned char descriptor;
49 char cache_type;
50 short size;
51};
52
53#define MB(x) ((x) * 1024)
54
55/* All the cache descriptor types we care about (no TLB or
56 trace cache entries) */
57
58static const struct _cache_table cache_table[] =
59{
60 { 0x06, LVL_1_INST, 8 }, /* 4-way set assoc, 32 byte line size */
61 { 0x08, LVL_1_INST, 16 }, /* 4-way set assoc, 32 byte line size */
62 { 0x09, LVL_1_INST, 32 }, /* 4-way set assoc, 64 byte line size */
63 { 0x0a, LVL_1_DATA, 8 }, /* 2 way set assoc, 32 byte line size */
64 { 0x0c, LVL_1_DATA, 16 }, /* 4-way set assoc, 32 byte line size */
65 { 0x0d, LVL_1_DATA, 16 }, /* 4-way set assoc, 64 byte line size */
66 { 0x0e, LVL_1_DATA, 24 }, /* 6-way set assoc, 64 byte line size */
67 { 0x21, LVL_2, 256 }, /* 8-way set assoc, 64 byte line size */
68 { 0x22, LVL_3, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
69 { 0x23, LVL_3, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
70 { 0x25, LVL_3, MB(2) }, /* 8-way set assoc, sectored cache, 64 byte line size */
71 { 0x29, LVL_3, MB(4) }, /* 8-way set assoc, sectored cache, 64 byte line size */
72 { 0x2c, LVL_1_DATA, 32 }, /* 8-way set assoc, 64 byte line size */
73 { 0x30, LVL_1_INST, 32 }, /* 8-way set assoc, 64 byte line size */
74 { 0x39, LVL_2, 128 }, /* 4-way set assoc, sectored cache, 64 byte line size */
75 { 0x3a, LVL_2, 192 }, /* 6-way set assoc, sectored cache, 64 byte line size */
76 { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
77 { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
78 { 0x3d, LVL_2, 384 }, /* 6-way set assoc, sectored cache, 64 byte line size */
79 { 0x3e, LVL_2, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
80 { 0x3f, LVL_2, 256 }, /* 2-way set assoc, 64 byte line size */
81 { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
82 { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
83 { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
84 { 0x44, LVL_2, MB(1) }, /* 4-way set assoc, 32 byte line size */
85 { 0x45, LVL_2, MB(2) }, /* 4-way set assoc, 32 byte line size */
86 { 0x46, LVL_3, MB(4) }, /* 4-way set assoc, 64 byte line size */
87 { 0x47, LVL_3, MB(8) }, /* 8-way set assoc, 64 byte line size */
88 { 0x48, LVL_2, MB(3) }, /* 12-way set assoc, 64 byte line size */
89 { 0x49, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
90 { 0x4a, LVL_3, MB(6) }, /* 12-way set assoc, 64 byte line size */
91 { 0x4b, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
92 { 0x4c, LVL_3, MB(12) }, /* 12-way set assoc, 64 byte line size */
93 { 0x4d, LVL_3, MB(16) }, /* 16-way set assoc, 64 byte line size */
94 { 0x4e, LVL_2, MB(6) }, /* 24-way set assoc, 64 byte line size */
95 { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
96 { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
97 { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
98 { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
99 { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
100 { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
101 { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
102 { 0x73, LVL_TRACE, 64 }, /* 8-way set assoc */
103 { 0x78, LVL_2, MB(1) }, /* 4-way set assoc, 64 byte line size */
104 { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
105 { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
106 { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
107 { 0x7c, LVL_2, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
108 { 0x7d, LVL_2, MB(2) }, /* 8-way set assoc, 64 byte line size */
109 { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
110 { 0x80, LVL_2, 512 }, /* 8-way set assoc, 64 byte line size */
111 { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
112 { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
113 { 0x84, LVL_2, MB(1) }, /* 8-way set assoc, 32 byte line size */
114 { 0x85, LVL_2, MB(2) }, /* 8-way set assoc, 32 byte line size */
115 { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
116 { 0x87, LVL_2, MB(1) }, /* 8-way set assoc, 64 byte line size */
117 { 0xd0, LVL_3, 512 }, /* 4-way set assoc, 64 byte line size */
118 { 0xd1, LVL_3, MB(1) }, /* 4-way set assoc, 64 byte line size */
119 { 0xd2, LVL_3, MB(2) }, /* 4-way set assoc, 64 byte line size */
120 { 0xd6, LVL_3, MB(1) }, /* 8-way set assoc, 64 byte line size */
121 { 0xd7, LVL_3, MB(2) }, /* 8-way set assoc, 64 byte line size */
122 { 0xd8, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
123 { 0xdc, LVL_3, MB(2) }, /* 12-way set assoc, 64 byte line size */
124 { 0xdd, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
125 { 0xde, LVL_3, MB(8) }, /* 12-way set assoc, 64 byte line size */
126 { 0xe2, LVL_3, MB(2) }, /* 16-way set assoc, 64 byte line size */
127 { 0xe3, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
128 { 0xe4, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
129 { 0xea, LVL_3, MB(12) }, /* 24-way set assoc, 64 byte line size */
130 { 0xeb, LVL_3, MB(18) }, /* 24-way set assoc, 64 byte line size */
131 { 0xec, LVL_3, MB(24) }, /* 24-way set assoc, 64 byte line size */
132 { 0x00, 0, 0}
133};
134
135
136enum _cache_type {
137 CTYPE_NULL = 0,
138 CTYPE_DATA = 1,
139 CTYPE_INST = 2,
140 CTYPE_UNIFIED = 3
141};
142
143union _cpuid4_leaf_eax {
144 struct {
145 enum _cache_type type:5;
146 unsigned int level:3;
147 unsigned int is_self_initializing:1;
148 unsigned int is_fully_associative:1;
149 unsigned int reserved:4;
150 unsigned int num_threads_sharing:12;
151 unsigned int num_cores_on_die:6;
152 } split;
153 u32 full;
154};
155
156union _cpuid4_leaf_ebx {
157 struct {
158 unsigned int coherency_line_size:12;
159 unsigned int physical_line_partition:10;
160 unsigned int ways_of_associativity:10;
161 } split;
162 u32 full;
163};
164
165union _cpuid4_leaf_ecx {
166 struct {
167 unsigned int number_of_sets:32;
168 } split;
169 u32 full;
170};
171
172struct _cpuid4_info_regs {
173 union _cpuid4_leaf_eax eax;
174 union _cpuid4_leaf_ebx ebx;
175 union _cpuid4_leaf_ecx ecx;
176 unsigned int id;
177 unsigned long size;
178 struct amd_northbridge *nb;
179};
180
181/* AMD doesn't have CPUID4. Emulate it here to report the same
182 information to the user. This makes some assumptions about the machine:
183 L2 not shared, no SMT etc. that is currently true on AMD CPUs.
184
185 In theory the TLBs could be reported as fake type (they are in "dummy").
186 Maybe later */
187union l1_cache {
188 struct {
189 unsigned line_size:8;
190 unsigned lines_per_tag:8;
191 unsigned assoc:8;
192 unsigned size_in_kb:8;
193 };
194 unsigned val;
195};
196
197union l2_cache {
198 struct {
199 unsigned line_size:8;
200 unsigned lines_per_tag:4;
201 unsigned assoc:4;
202 unsigned size_in_kb:16;
203 };
204 unsigned val;
205};
206
207union l3_cache {
208 struct {
209 unsigned line_size:8;
210 unsigned lines_per_tag:4;
211 unsigned assoc:4;
212 unsigned res:2;
213 unsigned size_encoded:14;
214 };
215 unsigned val;
216};
217
218static const unsigned short assocs[] = {
219 [1] = 1,
220 [2] = 2,
221 [4] = 4,
222 [6] = 8,
223 [8] = 16,
224 [0xa] = 32,
225 [0xb] = 48,
226 [0xc] = 64,
227 [0xd] = 96,
228 [0xe] = 128,
229 [0xf] = 0xffff /* fully associative - no way to show this currently */
230};
231
232static const unsigned char levels[] = { 1, 1, 2, 3 };
233static const unsigned char types[] = { 1, 2, 3, 3 };
234
235static const enum cache_type cache_type_map[] = {
236 [CTYPE_NULL] = CACHE_TYPE_NOCACHE,
237 [CTYPE_DATA] = CACHE_TYPE_DATA,
238 [CTYPE_INST] = CACHE_TYPE_INST,
239 [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
240};
241
242static void
243amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
244 union _cpuid4_leaf_ebx *ebx,
245 union _cpuid4_leaf_ecx *ecx)
246{
247 unsigned dummy;
248 unsigned line_size, lines_per_tag, assoc, size_in_kb;
249 union l1_cache l1i, l1d;
250 union l2_cache l2;
251 union l3_cache l3;
252 union l1_cache *l1 = &l1d;
253
254 eax->full = 0;
255 ebx->full = 0;
256 ecx->full = 0;
257
258 cpuid(0x80000005, &dummy, &dummy, &l1d.val, &l1i.val);
259 cpuid(0x80000006, &dummy, &dummy, &l2.val, &l3.val);
260
261 switch (leaf) {
262 case 1:
263 l1 = &l1i;
264 fallthrough;
265 case 0:
266 if (!l1->val)
267 return;
268 assoc = assocs[l1->assoc];
269 line_size = l1->line_size;
270 lines_per_tag = l1->lines_per_tag;
271 size_in_kb = l1->size_in_kb;
272 break;
273 case 2:
274 if (!l2.val)
275 return;
276 assoc = assocs[l2.assoc];
277 line_size = l2.line_size;
278 lines_per_tag = l2.lines_per_tag;
279 /* cpu_data has errata corrections for K7 applied */
280 size_in_kb = __this_cpu_read(cpu_info.x86_cache_size);
281 break;
282 case 3:
283 if (!l3.val)
284 return;
285 assoc = assocs[l3.assoc];
286 line_size = l3.line_size;
287 lines_per_tag = l3.lines_per_tag;
288 size_in_kb = l3.size_encoded * 512;
289 if (boot_cpu_has(X86_FEATURE_AMD_DCM)) {
290 size_in_kb = size_in_kb >> 1;
291 assoc = assoc >> 1;
292 }
293 break;
294 default:
295 return;
296 }
297
298 eax->split.is_self_initializing = 1;
299 eax->split.type = types[leaf];
300 eax->split.level = levels[leaf];
301 eax->split.num_threads_sharing = 0;
302 eax->split.num_cores_on_die = topology_num_cores_per_package();
303
304
305 if (assoc == 0xffff)
306 eax->split.is_fully_associative = 1;
307 ebx->split.coherency_line_size = line_size - 1;
308 ebx->split.ways_of_associativity = assoc - 1;
309 ebx->split.physical_line_partition = lines_per_tag - 1;
310 ecx->split.number_of_sets = (size_in_kb * 1024) / line_size /
311 (ebx->split.ways_of_associativity + 1) - 1;
312}
313
314#if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
315
316/*
317 * L3 cache descriptors
318 */
319static void amd_calc_l3_indices(struct amd_northbridge *nb)
320{
321 struct amd_l3_cache *l3 = &nb->l3_cache;
322 unsigned int sc0, sc1, sc2, sc3;
323 u32 val = 0;
324
325 pci_read_config_dword(nb->misc, 0x1C4, &val);
326
327 /* calculate subcache sizes */
328 l3->subcaches[0] = sc0 = !(val & BIT(0));
329 l3->subcaches[1] = sc1 = !(val & BIT(4));
330
331 if (boot_cpu_data.x86 == 0x15) {
332 l3->subcaches[0] = sc0 += !(val & BIT(1));
333 l3->subcaches[1] = sc1 += !(val & BIT(5));
334 }
335
336 l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
337 l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
338
339 l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
340}
341
342/*
343 * check whether a slot used for disabling an L3 index is occupied.
344 * @l3: L3 cache descriptor
345 * @slot: slot number (0..1)
346 *
347 * @returns: the disabled index if used or negative value if slot free.
348 */
349static int amd_get_l3_disable_slot(struct amd_northbridge *nb, unsigned slot)
350{
351 unsigned int reg = 0;
352
353 pci_read_config_dword(nb->misc, 0x1BC + slot * 4, ®);
354
355 /* check whether this slot is activated already */
356 if (reg & (3UL << 30))
357 return reg & 0xfff;
358
359 return -1;
360}
361
362static ssize_t show_cache_disable(struct cacheinfo *this_leaf, char *buf,
363 unsigned int slot)
364{
365 int index;
366 struct amd_northbridge *nb = this_leaf->priv;
367
368 index = amd_get_l3_disable_slot(nb, slot);
369 if (index >= 0)
370 return sprintf(buf, "%d\n", index);
371
372 return sprintf(buf, "FREE\n");
373}
374
375#define SHOW_CACHE_DISABLE(slot) \
376static ssize_t \
377cache_disable_##slot##_show(struct device *dev, \
378 struct device_attribute *attr, char *buf) \
379{ \
380 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
381 return show_cache_disable(this_leaf, buf, slot); \
382}
383SHOW_CACHE_DISABLE(0)
384SHOW_CACHE_DISABLE(1)
385
386static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
387 unsigned slot, unsigned long idx)
388{
389 int i;
390
391 idx |= BIT(30);
392
393 /*
394 * disable index in all 4 subcaches
395 */
396 for (i = 0; i < 4; i++) {
397 u32 reg = idx | (i << 20);
398
399 if (!nb->l3_cache.subcaches[i])
400 continue;
401
402 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
403
404 /*
405 * We need to WBINVD on a core on the node containing the L3
406 * cache which indices we disable therefore a simple wbinvd()
407 * is not sufficient.
408 */
409 wbinvd_on_cpu(cpu);
410
411 reg |= BIT(31);
412 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
413 }
414}
415
416/*
417 * disable a L3 cache index by using a disable-slot
418 *
419 * @l3: L3 cache descriptor
420 * @cpu: A CPU on the node containing the L3 cache
421 * @slot: slot number (0..1)
422 * @index: index to disable
423 *
424 * @return: 0 on success, error status on failure
425 */
426static int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu,
427 unsigned slot, unsigned long index)
428{
429 int ret = 0;
430
431 /* check if @slot is already used or the index is already disabled */
432 ret = amd_get_l3_disable_slot(nb, slot);
433 if (ret >= 0)
434 return -EEXIST;
435
436 if (index > nb->l3_cache.indices)
437 return -EINVAL;
438
439 /* check whether the other slot has disabled the same index already */
440 if (index == amd_get_l3_disable_slot(nb, !slot))
441 return -EEXIST;
442
443 amd_l3_disable_index(nb, cpu, slot, index);
444
445 return 0;
446}
447
448static ssize_t store_cache_disable(struct cacheinfo *this_leaf,
449 const char *buf, size_t count,
450 unsigned int slot)
451{
452 unsigned long val = 0;
453 int cpu, err = 0;
454 struct amd_northbridge *nb = this_leaf->priv;
455
456 if (!capable(CAP_SYS_ADMIN))
457 return -EPERM;
458
459 cpu = cpumask_first(&this_leaf->shared_cpu_map);
460
461 if (kstrtoul(buf, 10, &val) < 0)
462 return -EINVAL;
463
464 err = amd_set_l3_disable_slot(nb, cpu, slot, val);
465 if (err) {
466 if (err == -EEXIST)
467 pr_warn("L3 slot %d in use/index already disabled!\n",
468 slot);
469 return err;
470 }
471 return count;
472}
473
474#define STORE_CACHE_DISABLE(slot) \
475static ssize_t \
476cache_disable_##slot##_store(struct device *dev, \
477 struct device_attribute *attr, \
478 const char *buf, size_t count) \
479{ \
480 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
481 return store_cache_disable(this_leaf, buf, count, slot); \
482}
483STORE_CACHE_DISABLE(0)
484STORE_CACHE_DISABLE(1)
485
486static ssize_t subcaches_show(struct device *dev,
487 struct device_attribute *attr, char *buf)
488{
489 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
490 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
491
492 return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
493}
494
495static ssize_t subcaches_store(struct device *dev,
496 struct device_attribute *attr,
497 const char *buf, size_t count)
498{
499 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
500 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
501 unsigned long val;
502
503 if (!capable(CAP_SYS_ADMIN))
504 return -EPERM;
505
506 if (kstrtoul(buf, 16, &val) < 0)
507 return -EINVAL;
508
509 if (amd_set_subcaches(cpu, val))
510 return -EINVAL;
511
512 return count;
513}
514
515static DEVICE_ATTR_RW(cache_disable_0);
516static DEVICE_ATTR_RW(cache_disable_1);
517static DEVICE_ATTR_RW(subcaches);
518
519static umode_t
520cache_private_attrs_is_visible(struct kobject *kobj,
521 struct attribute *attr, int unused)
522{
523 struct device *dev = kobj_to_dev(kobj);
524 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
525 umode_t mode = attr->mode;
526
527 if (!this_leaf->priv)
528 return 0;
529
530 if ((attr == &dev_attr_subcaches.attr) &&
531 amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
532 return mode;
533
534 if ((attr == &dev_attr_cache_disable_0.attr ||
535 attr == &dev_attr_cache_disable_1.attr) &&
536 amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
537 return mode;
538
539 return 0;
540}
541
542static struct attribute_group cache_private_group = {
543 .is_visible = cache_private_attrs_is_visible,
544};
545
546static void init_amd_l3_attrs(void)
547{
548 int n = 1;
549 static struct attribute **amd_l3_attrs;
550
551 if (amd_l3_attrs) /* already initialized */
552 return;
553
554 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
555 n += 2;
556 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
557 n += 1;
558
559 amd_l3_attrs = kcalloc(n, sizeof(*amd_l3_attrs), GFP_KERNEL);
560 if (!amd_l3_attrs)
561 return;
562
563 n = 0;
564 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE)) {
565 amd_l3_attrs[n++] = &dev_attr_cache_disable_0.attr;
566 amd_l3_attrs[n++] = &dev_attr_cache_disable_1.attr;
567 }
568 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
569 amd_l3_attrs[n++] = &dev_attr_subcaches.attr;
570
571 cache_private_group.attrs = amd_l3_attrs;
572}
573
574const struct attribute_group *
575cache_get_priv_group(struct cacheinfo *this_leaf)
576{
577 struct amd_northbridge *nb = this_leaf->priv;
578
579 if (this_leaf->level < 3 || !nb)
580 return NULL;
581
582 if (nb && nb->l3_cache.indices)
583 init_amd_l3_attrs();
584
585 return &cache_private_group;
586}
587
588static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
589{
590 int node;
591
592 /* only for L3, and not in virtualized environments */
593 if (index < 3)
594 return;
595
596 node = topology_amd_node_id(smp_processor_id());
597 this_leaf->nb = node_to_amd_nb(node);
598 if (this_leaf->nb && !this_leaf->nb->l3_cache.indices)
599 amd_calc_l3_indices(this_leaf->nb);
600}
601#else
602#define amd_init_l3_cache(x, y)
603#endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
604
605static int
606cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
607{
608 union _cpuid4_leaf_eax eax;
609 union _cpuid4_leaf_ebx ebx;
610 union _cpuid4_leaf_ecx ecx;
611 unsigned edx;
612
613 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
614 if (boot_cpu_has(X86_FEATURE_TOPOEXT))
615 cpuid_count(0x8000001d, index, &eax.full,
616 &ebx.full, &ecx.full, &edx);
617 else
618 amd_cpuid4(index, &eax, &ebx, &ecx);
619 amd_init_l3_cache(this_leaf, index);
620 } else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
621 cpuid_count(0x8000001d, index, &eax.full,
622 &ebx.full, &ecx.full, &edx);
623 amd_init_l3_cache(this_leaf, index);
624 } else {
625 cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
626 }
627
628 if (eax.split.type == CTYPE_NULL)
629 return -EIO; /* better error ? */
630
631 this_leaf->eax = eax;
632 this_leaf->ebx = ebx;
633 this_leaf->ecx = ecx;
634 this_leaf->size = (ecx.split.number_of_sets + 1) *
635 (ebx.split.coherency_line_size + 1) *
636 (ebx.split.physical_line_partition + 1) *
637 (ebx.split.ways_of_associativity + 1);
638 return 0;
639}
640
641static int find_num_cache_leaves(struct cpuinfo_x86 *c)
642{
643 unsigned int eax, ebx, ecx, edx, op;
644 union _cpuid4_leaf_eax cache_eax;
645 int i = -1;
646
647 if (c->x86_vendor == X86_VENDOR_AMD ||
648 c->x86_vendor == X86_VENDOR_HYGON)
649 op = 0x8000001d;
650 else
651 op = 4;
652
653 do {
654 ++i;
655 /* Do cpuid(op) loop to find out num_cache_leaves */
656 cpuid_count(op, i, &eax, &ebx, &ecx, &edx);
657 cache_eax.full = eax;
658 } while (cache_eax.split.type != CTYPE_NULL);
659 return i;
660}
661
662void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, u16 die_id)
663{
664 /*
665 * We may have multiple LLCs if L3 caches exist, so check if we
666 * have an L3 cache by looking at the L3 cache CPUID leaf.
667 */
668 if (!cpuid_edx(0x80000006))
669 return;
670
671 if (c->x86 < 0x17) {
672 /* LLC is at the node level. */
673 c->topo.llc_id = die_id;
674 } else if (c->x86 == 0x17 && c->x86_model <= 0x1F) {
675 /*
676 * LLC is at the core complex level.
677 * Core complex ID is ApicId[3] for these processors.
678 */
679 c->topo.llc_id = c->topo.apicid >> 3;
680 } else {
681 /*
682 * LLC ID is calculated from the number of threads sharing the
683 * cache.
684 * */
685 u32 eax, ebx, ecx, edx, num_sharing_cache = 0;
686 u32 llc_index = find_num_cache_leaves(c) - 1;
687
688 cpuid_count(0x8000001d, llc_index, &eax, &ebx, &ecx, &edx);
689 if (eax)
690 num_sharing_cache = ((eax >> 14) & 0xfff) + 1;
691
692 if (num_sharing_cache) {
693 int bits = get_count_order(num_sharing_cache);
694
695 c->topo.llc_id = c->topo.apicid >> bits;
696 }
697 }
698}
699
700void cacheinfo_hygon_init_llc_id(struct cpuinfo_x86 *c)
701{
702 /*
703 * We may have multiple LLCs if L3 caches exist, so check if we
704 * have an L3 cache by looking at the L3 cache CPUID leaf.
705 */
706 if (!cpuid_edx(0x80000006))
707 return;
708
709 /*
710 * LLC is at the core complex level.
711 * Core complex ID is ApicId[3] for these processors.
712 */
713 c->topo.llc_id = c->topo.apicid >> 3;
714}
715
716void init_amd_cacheinfo(struct cpuinfo_x86 *c)
717{
718 struct cpu_cacheinfo *ci = get_cpu_cacheinfo(c->cpu_index);
719
720 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
721 ci->num_leaves = find_num_cache_leaves(c);
722 } else if (c->extended_cpuid_level >= 0x80000006) {
723 if (cpuid_edx(0x80000006) & 0xf000)
724 ci->num_leaves = 4;
725 else
726 ci->num_leaves = 3;
727 }
728}
729
730void init_hygon_cacheinfo(struct cpuinfo_x86 *c)
731{
732 struct cpu_cacheinfo *ci = get_cpu_cacheinfo(c->cpu_index);
733
734 ci->num_leaves = find_num_cache_leaves(c);
735}
736
737void init_intel_cacheinfo(struct cpuinfo_x86 *c)
738{
739 /* Cache sizes */
740 unsigned int l1i = 0, l1d = 0, l2 = 0, l3 = 0;
741 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
742 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
743 unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
744 struct cpu_cacheinfo *ci = get_cpu_cacheinfo(c->cpu_index);
745
746 if (c->cpuid_level > 3) {
747 /*
748 * There should be at least one leaf. A non-zero value means
749 * that the number of leaves has been initialized.
750 */
751 if (!ci->num_leaves)
752 ci->num_leaves = find_num_cache_leaves(c);
753
754 /*
755 * Whenever possible use cpuid(4), deterministic cache
756 * parameters cpuid leaf to find the cache details
757 */
758 for (i = 0; i < ci->num_leaves; i++) {
759 struct _cpuid4_info_regs this_leaf = {};
760 int retval;
761
762 retval = cpuid4_cache_lookup_regs(i, &this_leaf);
763 if (retval < 0)
764 continue;
765
766 switch (this_leaf.eax.split.level) {
767 case 1:
768 if (this_leaf.eax.split.type == CTYPE_DATA)
769 new_l1d = this_leaf.size/1024;
770 else if (this_leaf.eax.split.type == CTYPE_INST)
771 new_l1i = this_leaf.size/1024;
772 break;
773 case 2:
774 new_l2 = this_leaf.size/1024;
775 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
776 index_msb = get_count_order(num_threads_sharing);
777 l2_id = c->topo.apicid & ~((1 << index_msb) - 1);
778 break;
779 case 3:
780 new_l3 = this_leaf.size/1024;
781 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
782 index_msb = get_count_order(num_threads_sharing);
783 l3_id = c->topo.apicid & ~((1 << index_msb) - 1);
784 break;
785 default:
786 break;
787 }
788 }
789 }
790 /*
791 * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
792 * trace cache
793 */
794 if ((!ci->num_leaves || c->x86 == 15) && c->cpuid_level > 1) {
795 /* supports eax=2 call */
796 int j, n;
797 unsigned int regs[4];
798 unsigned char *dp = (unsigned char *)regs;
799 int only_trace = 0;
800
801 if (ci->num_leaves && c->x86 == 15)
802 only_trace = 1;
803
804 /* Number of times to iterate */
805 n = cpuid_eax(2) & 0xFF;
806
807 for (i = 0 ; i < n ; i++) {
808 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
809
810 /* If bit 31 is set, this is an unknown format */
811 for (j = 0 ; j < 4 ; j++)
812 if (regs[j] & (1 << 31))
813 regs[j] = 0;
814
815 /* Byte 0 is level count, not a descriptor */
816 for (j = 1 ; j < 16 ; j++) {
817 unsigned char des = dp[j];
818 unsigned char k = 0;
819
820 /* look up this descriptor in the table */
821 while (cache_table[k].descriptor != 0) {
822 if (cache_table[k].descriptor == des) {
823 if (only_trace && cache_table[k].cache_type != LVL_TRACE)
824 break;
825 switch (cache_table[k].cache_type) {
826 case LVL_1_INST:
827 l1i += cache_table[k].size;
828 break;
829 case LVL_1_DATA:
830 l1d += cache_table[k].size;
831 break;
832 case LVL_2:
833 l2 += cache_table[k].size;
834 break;
835 case LVL_3:
836 l3 += cache_table[k].size;
837 break;
838 }
839
840 break;
841 }
842
843 k++;
844 }
845 }
846 }
847 }
848
849 if (new_l1d)
850 l1d = new_l1d;
851
852 if (new_l1i)
853 l1i = new_l1i;
854
855 if (new_l2) {
856 l2 = new_l2;
857 c->topo.llc_id = l2_id;
858 c->topo.l2c_id = l2_id;
859 }
860
861 if (new_l3) {
862 l3 = new_l3;
863 c->topo.llc_id = l3_id;
864 }
865
866 /*
867 * If llc_id is not yet set, this means cpuid_level < 4 which in
868 * turns means that the only possibility is SMT (as indicated in
869 * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
870 * that SMT shares all caches, we can unconditionally set cpu_llc_id to
871 * c->topo.pkg_id.
872 */
873 if (c->topo.llc_id == BAD_APICID)
874 c->topo.llc_id = c->topo.pkg_id;
875
876 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
877
878 if (!l2)
879 cpu_detect_cache_sizes(c);
880}
881
882static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
883 struct _cpuid4_info_regs *base)
884{
885 struct cpu_cacheinfo *this_cpu_ci;
886 struct cacheinfo *this_leaf;
887 int i, sibling;
888
889 /*
890 * For L3, always use the pre-calculated cpu_llc_shared_mask
891 * to derive shared_cpu_map.
892 */
893 if (index == 3) {
894 for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
895 this_cpu_ci = get_cpu_cacheinfo(i);
896 if (!this_cpu_ci->info_list)
897 continue;
898 this_leaf = this_cpu_ci->info_list + index;
899 for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
900 if (!cpu_online(sibling))
901 continue;
902 cpumask_set_cpu(sibling,
903 &this_leaf->shared_cpu_map);
904 }
905 }
906 } else if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
907 unsigned int apicid, nshared, first, last;
908
909 nshared = base->eax.split.num_threads_sharing + 1;
910 apicid = cpu_data(cpu).topo.apicid;
911 first = apicid - (apicid % nshared);
912 last = first + nshared - 1;
913
914 for_each_online_cpu(i) {
915 this_cpu_ci = get_cpu_cacheinfo(i);
916 if (!this_cpu_ci->info_list)
917 continue;
918
919 apicid = cpu_data(i).topo.apicid;
920 if ((apicid < first) || (apicid > last))
921 continue;
922
923 this_leaf = this_cpu_ci->info_list + index;
924
925 for_each_online_cpu(sibling) {
926 apicid = cpu_data(sibling).topo.apicid;
927 if ((apicid < first) || (apicid > last))
928 continue;
929 cpumask_set_cpu(sibling,
930 &this_leaf->shared_cpu_map);
931 }
932 }
933 } else
934 return 0;
935
936 return 1;
937}
938
939static void __cache_cpumap_setup(unsigned int cpu, int index,
940 struct _cpuid4_info_regs *base)
941{
942 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
943 struct cacheinfo *this_leaf, *sibling_leaf;
944 unsigned long num_threads_sharing;
945 int index_msb, i;
946 struct cpuinfo_x86 *c = &cpu_data(cpu);
947
948 if (c->x86_vendor == X86_VENDOR_AMD ||
949 c->x86_vendor == X86_VENDOR_HYGON) {
950 if (__cache_amd_cpumap_setup(cpu, index, base))
951 return;
952 }
953
954 this_leaf = this_cpu_ci->info_list + index;
955 num_threads_sharing = 1 + base->eax.split.num_threads_sharing;
956
957 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
958 if (num_threads_sharing == 1)
959 return;
960
961 index_msb = get_count_order(num_threads_sharing);
962
963 for_each_online_cpu(i)
964 if (cpu_data(i).topo.apicid >> index_msb == c->topo.apicid >> index_msb) {
965 struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
966
967 if (i == cpu || !sib_cpu_ci->info_list)
968 continue;/* skip if itself or no cacheinfo */
969 sibling_leaf = sib_cpu_ci->info_list + index;
970 cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
971 cpumask_set_cpu(cpu, &sibling_leaf->shared_cpu_map);
972 }
973}
974
975static void ci_leaf_init(struct cacheinfo *this_leaf,
976 struct _cpuid4_info_regs *base)
977{
978 this_leaf->id = base->id;
979 this_leaf->attributes = CACHE_ID;
980 this_leaf->level = base->eax.split.level;
981 this_leaf->type = cache_type_map[base->eax.split.type];
982 this_leaf->coherency_line_size =
983 base->ebx.split.coherency_line_size + 1;
984 this_leaf->ways_of_associativity =
985 base->ebx.split.ways_of_associativity + 1;
986 this_leaf->size = base->size;
987 this_leaf->number_of_sets = base->ecx.split.number_of_sets + 1;
988 this_leaf->physical_line_partition =
989 base->ebx.split.physical_line_partition + 1;
990 this_leaf->priv = base->nb;
991}
992
993int init_cache_level(unsigned int cpu)
994{
995 struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
996
997 /* There should be at least one leaf. */
998 if (!ci->num_leaves)
999 return -ENOENT;
1000
1001 return 0;
1002}
1003
1004/*
1005 * The max shared threads number comes from CPUID.4:EAX[25-14] with input
1006 * ECX as cache index. Then right shift apicid by the number's order to get
1007 * cache id for this cache node.
1008 */
1009static void get_cache_id(int cpu, struct _cpuid4_info_regs *id4_regs)
1010{
1011 struct cpuinfo_x86 *c = &cpu_data(cpu);
1012 unsigned long num_threads_sharing;
1013 int index_msb;
1014
1015 num_threads_sharing = 1 + id4_regs->eax.split.num_threads_sharing;
1016 index_msb = get_count_order(num_threads_sharing);
1017 id4_regs->id = c->topo.apicid >> index_msb;
1018}
1019
1020int populate_cache_leaves(unsigned int cpu)
1021{
1022 unsigned int idx, ret;
1023 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
1024 struct cacheinfo *this_leaf = this_cpu_ci->info_list;
1025 struct _cpuid4_info_regs id4_regs = {};
1026
1027 for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
1028 ret = cpuid4_cache_lookup_regs(idx, &id4_regs);
1029 if (ret)
1030 return ret;
1031 get_cache_id(cpu, &id4_regs);
1032 ci_leaf_init(this_leaf++, &id4_regs);
1033 __cache_cpumap_setup(cpu, idx, &id4_regs);
1034 }
1035 this_cpu_ci->cpu_map_populated = true;
1036
1037 return 0;
1038}
1039
1040/*
1041 * Disable and enable caches. Needed for changing MTRRs and the PAT MSR.
1042 *
1043 * Since we are disabling the cache don't allow any interrupts,
1044 * they would run extremely slow and would only increase the pain.
1045 *
1046 * The caller must ensure that local interrupts are disabled and
1047 * are reenabled after cache_enable() has been called.
1048 */
1049static unsigned long saved_cr4;
1050static DEFINE_RAW_SPINLOCK(cache_disable_lock);
1051
1052void cache_disable(void) __acquires(cache_disable_lock)
1053{
1054 unsigned long cr0;
1055
1056 /*
1057 * Note that this is not ideal
1058 * since the cache is only flushed/disabled for this CPU while the
1059 * MTRRs are changed, but changing this requires more invasive
1060 * changes to the way the kernel boots
1061 */
1062
1063 raw_spin_lock(&cache_disable_lock);
1064
1065 /* Enter the no-fill (CD=1, NW=0) cache mode and flush caches. */
1066 cr0 = read_cr0() | X86_CR0_CD;
1067 write_cr0(cr0);
1068
1069 /*
1070 * Cache flushing is the most time-consuming step when programming
1071 * the MTRRs. Fortunately, as per the Intel Software Development
1072 * Manual, we can skip it if the processor supports cache self-
1073 * snooping.
1074 */
1075 if (!static_cpu_has(X86_FEATURE_SELFSNOOP))
1076 wbinvd();
1077
1078 /* Save value of CR4 and clear Page Global Enable (bit 7) */
1079 if (cpu_feature_enabled(X86_FEATURE_PGE)) {
1080 saved_cr4 = __read_cr4();
1081 __write_cr4(saved_cr4 & ~X86_CR4_PGE);
1082 }
1083
1084 /* Flush all TLBs via a mov %cr3, %reg; mov %reg, %cr3 */
1085 count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
1086 flush_tlb_local();
1087
1088 if (cpu_feature_enabled(X86_FEATURE_MTRR))
1089 mtrr_disable();
1090
1091 /* Again, only flush caches if we have to. */
1092 if (!static_cpu_has(X86_FEATURE_SELFSNOOP))
1093 wbinvd();
1094}
1095
1096void cache_enable(void) __releases(cache_disable_lock)
1097{
1098 /* Flush TLBs (no need to flush caches - they are disabled) */
1099 count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
1100 flush_tlb_local();
1101
1102 if (cpu_feature_enabled(X86_FEATURE_MTRR))
1103 mtrr_enable();
1104
1105 /* Enable caches */
1106 write_cr0(read_cr0() & ~X86_CR0_CD);
1107
1108 /* Restore value of CR4 */
1109 if (cpu_feature_enabled(X86_FEATURE_PGE))
1110 __write_cr4(saved_cr4);
1111
1112 raw_spin_unlock(&cache_disable_lock);
1113}
1114
1115static void cache_cpu_init(void)
1116{
1117 unsigned long flags;
1118
1119 local_irq_save(flags);
1120
1121 if (memory_caching_control & CACHE_MTRR) {
1122 cache_disable();
1123 mtrr_generic_set_state();
1124 cache_enable();
1125 }
1126
1127 if (memory_caching_control & CACHE_PAT)
1128 pat_cpu_init();
1129
1130 local_irq_restore(flags);
1131}
1132
1133static bool cache_aps_delayed_init = true;
1134
1135void set_cache_aps_delayed_init(bool val)
1136{
1137 cache_aps_delayed_init = val;
1138}
1139
1140bool get_cache_aps_delayed_init(void)
1141{
1142 return cache_aps_delayed_init;
1143}
1144
1145static int cache_rendezvous_handler(void *unused)
1146{
1147 if (get_cache_aps_delayed_init() || !cpu_online(smp_processor_id()))
1148 cache_cpu_init();
1149
1150 return 0;
1151}
1152
1153void __init cache_bp_init(void)
1154{
1155 mtrr_bp_init();
1156 pat_bp_init();
1157
1158 if (memory_caching_control)
1159 cache_cpu_init();
1160}
1161
1162void cache_bp_restore(void)
1163{
1164 if (memory_caching_control)
1165 cache_cpu_init();
1166}
1167
1168static int cache_ap_online(unsigned int cpu)
1169{
1170 cpumask_set_cpu(cpu, cpu_cacheinfo_mask);
1171
1172 if (!memory_caching_control || get_cache_aps_delayed_init())
1173 return 0;
1174
1175 /*
1176 * Ideally we should hold mtrr_mutex here to avoid MTRR entries
1177 * changed, but this routine will be called in CPU boot time,
1178 * holding the lock breaks it.
1179 *
1180 * This routine is called in two cases:
1181 *
1182 * 1. very early time of software resume, when there absolutely
1183 * isn't MTRR entry changes;
1184 *
1185 * 2. CPU hotadd time. We let mtrr_add/del_page hold cpuhotplug
1186 * lock to prevent MTRR entry changes
1187 */
1188 stop_machine_from_inactive_cpu(cache_rendezvous_handler, NULL,
1189 cpu_cacheinfo_mask);
1190
1191 return 0;
1192}
1193
1194static int cache_ap_offline(unsigned int cpu)
1195{
1196 cpumask_clear_cpu(cpu, cpu_cacheinfo_mask);
1197 return 0;
1198}
1199
1200/*
1201 * Delayed cache initialization for all AP's
1202 */
1203void cache_aps_init(void)
1204{
1205 if (!memory_caching_control || !get_cache_aps_delayed_init())
1206 return;
1207
1208 stop_machine(cache_rendezvous_handler, NULL, cpu_online_mask);
1209 set_cache_aps_delayed_init(false);
1210}
1211
1212static int __init cache_ap_register(void)
1213{
1214 zalloc_cpumask_var(&cpu_cacheinfo_mask, GFP_KERNEL);
1215 cpumask_set_cpu(smp_processor_id(), cpu_cacheinfo_mask);
1216
1217 cpuhp_setup_state_nocalls(CPUHP_AP_CACHECTRL_STARTING,
1218 "x86/cachectrl:starting",
1219 cache_ap_online, cache_ap_offline);
1220 return 0;
1221}
1222early_initcall(cache_ap_register);