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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/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
181static unsigned short num_cache_leaves;
182
183/* AMD doesn't have CPUID4. Emulate it here to report the same
184 information to the user. This makes some assumptions about the machine:
185 L2 not shared, no SMT etc. that is currently true on AMD CPUs.
186
187 In theory the TLBs could be reported as fake type (they are in "dummy").
188 Maybe later */
189union l1_cache {
190 struct {
191 unsigned line_size:8;
192 unsigned lines_per_tag:8;
193 unsigned assoc:8;
194 unsigned size_in_kb:8;
195 };
196 unsigned val;
197};
198
199union l2_cache {
200 struct {
201 unsigned line_size:8;
202 unsigned lines_per_tag:4;
203 unsigned assoc:4;
204 unsigned size_in_kb:16;
205 };
206 unsigned val;
207};
208
209union l3_cache {
210 struct {
211 unsigned line_size:8;
212 unsigned lines_per_tag:4;
213 unsigned assoc:4;
214 unsigned res:2;
215 unsigned size_encoded:14;
216 };
217 unsigned val;
218};
219
220static const unsigned short assocs[] = {
221 [1] = 1,
222 [2] = 2,
223 [4] = 4,
224 [6] = 8,
225 [8] = 16,
226 [0xa] = 32,
227 [0xb] = 48,
228 [0xc] = 64,
229 [0xd] = 96,
230 [0xe] = 128,
231 [0xf] = 0xffff /* fully associative - no way to show this currently */
232};
233
234static const unsigned char levels[] = { 1, 1, 2, 3 };
235static const unsigned char types[] = { 1, 2, 3, 3 };
236
237static const enum cache_type cache_type_map[] = {
238 [CTYPE_NULL] = CACHE_TYPE_NOCACHE,
239 [CTYPE_DATA] = CACHE_TYPE_DATA,
240 [CTYPE_INST] = CACHE_TYPE_INST,
241 [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
242};
243
244static void
245amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
246 union _cpuid4_leaf_ebx *ebx,
247 union _cpuid4_leaf_ecx *ecx)
248{
249 unsigned dummy;
250 unsigned line_size, lines_per_tag, assoc, size_in_kb;
251 union l1_cache l1i, l1d;
252 union l2_cache l2;
253 union l3_cache l3;
254 union l1_cache *l1 = &l1d;
255
256 eax->full = 0;
257 ebx->full = 0;
258 ecx->full = 0;
259
260 cpuid(0x80000005, &dummy, &dummy, &l1d.val, &l1i.val);
261 cpuid(0x80000006, &dummy, &dummy, &l2.val, &l3.val);
262
263 switch (leaf) {
264 case 1:
265 l1 = &l1i;
266 fallthrough;
267 case 0:
268 if (!l1->val)
269 return;
270 assoc = assocs[l1->assoc];
271 line_size = l1->line_size;
272 lines_per_tag = l1->lines_per_tag;
273 size_in_kb = l1->size_in_kb;
274 break;
275 case 2:
276 if (!l2.val)
277 return;
278 assoc = assocs[l2.assoc];
279 line_size = l2.line_size;
280 lines_per_tag = l2.lines_per_tag;
281 /* cpu_data has errata corrections for K7 applied */
282 size_in_kb = __this_cpu_read(cpu_info.x86_cache_size);
283 break;
284 case 3:
285 if (!l3.val)
286 return;
287 assoc = assocs[l3.assoc];
288 line_size = l3.line_size;
289 lines_per_tag = l3.lines_per_tag;
290 size_in_kb = l3.size_encoded * 512;
291 if (boot_cpu_has(X86_FEATURE_AMD_DCM)) {
292 size_in_kb = size_in_kb >> 1;
293 assoc = assoc >> 1;
294 }
295 break;
296 default:
297 return;
298 }
299
300 eax->split.is_self_initializing = 1;
301 eax->split.type = types[leaf];
302 eax->split.level = levels[leaf];
303 eax->split.num_threads_sharing = 0;
304 eax->split.num_cores_on_die = __this_cpu_read(cpu_info.x86_max_cores) - 1;
305
306
307 if (assoc == 0xffff)
308 eax->split.is_fully_associative = 1;
309 ebx->split.coherency_line_size = line_size - 1;
310 ebx->split.ways_of_associativity = assoc - 1;
311 ebx->split.physical_line_partition = lines_per_tag - 1;
312 ecx->split.number_of_sets = (size_in_kb * 1024) / line_size /
313 (ebx->split.ways_of_associativity + 1) - 1;
314}
315
316#if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
317
318/*
319 * L3 cache descriptors
320 */
321static void amd_calc_l3_indices(struct amd_northbridge *nb)
322{
323 struct amd_l3_cache *l3 = &nb->l3_cache;
324 unsigned int sc0, sc1, sc2, sc3;
325 u32 val = 0;
326
327 pci_read_config_dword(nb->misc, 0x1C4, &val);
328
329 /* calculate subcache sizes */
330 l3->subcaches[0] = sc0 = !(val & BIT(0));
331 l3->subcaches[1] = sc1 = !(val & BIT(4));
332
333 if (boot_cpu_data.x86 == 0x15) {
334 l3->subcaches[0] = sc0 += !(val & BIT(1));
335 l3->subcaches[1] = sc1 += !(val & BIT(5));
336 }
337
338 l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
339 l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
340
341 l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
342}
343
344/*
345 * check whether a slot used for disabling an L3 index is occupied.
346 * @l3: L3 cache descriptor
347 * @slot: slot number (0..1)
348 *
349 * @returns: the disabled index if used or negative value if slot free.
350 */
351static int amd_get_l3_disable_slot(struct amd_northbridge *nb, unsigned slot)
352{
353 unsigned int reg = 0;
354
355 pci_read_config_dword(nb->misc, 0x1BC + slot * 4, ®);
356
357 /* check whether this slot is activated already */
358 if (reg & (3UL << 30))
359 return reg & 0xfff;
360
361 return -1;
362}
363
364static ssize_t show_cache_disable(struct cacheinfo *this_leaf, char *buf,
365 unsigned int slot)
366{
367 int index;
368 struct amd_northbridge *nb = this_leaf->priv;
369
370 index = amd_get_l3_disable_slot(nb, slot);
371 if (index >= 0)
372 return sprintf(buf, "%d\n", index);
373
374 return sprintf(buf, "FREE\n");
375}
376
377#define SHOW_CACHE_DISABLE(slot) \
378static ssize_t \
379cache_disable_##slot##_show(struct device *dev, \
380 struct device_attribute *attr, char *buf) \
381{ \
382 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
383 return show_cache_disable(this_leaf, buf, slot); \
384}
385SHOW_CACHE_DISABLE(0)
386SHOW_CACHE_DISABLE(1)
387
388static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
389 unsigned slot, unsigned long idx)
390{
391 int i;
392
393 idx |= BIT(30);
394
395 /*
396 * disable index in all 4 subcaches
397 */
398 for (i = 0; i < 4; i++) {
399 u32 reg = idx | (i << 20);
400
401 if (!nb->l3_cache.subcaches[i])
402 continue;
403
404 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
405
406 /*
407 * We need to WBINVD on a core on the node containing the L3
408 * cache which indices we disable therefore a simple wbinvd()
409 * is not sufficient.
410 */
411 wbinvd_on_cpu(cpu);
412
413 reg |= BIT(31);
414 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
415 }
416}
417
418/*
419 * disable a L3 cache index by using a disable-slot
420 *
421 * @l3: L3 cache descriptor
422 * @cpu: A CPU on the node containing the L3 cache
423 * @slot: slot number (0..1)
424 * @index: index to disable
425 *
426 * @return: 0 on success, error status on failure
427 */
428static int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu,
429 unsigned slot, unsigned long index)
430{
431 int ret = 0;
432
433 /* check if @slot is already used or the index is already disabled */
434 ret = amd_get_l3_disable_slot(nb, slot);
435 if (ret >= 0)
436 return -EEXIST;
437
438 if (index > nb->l3_cache.indices)
439 return -EINVAL;
440
441 /* check whether the other slot has disabled the same index already */
442 if (index == amd_get_l3_disable_slot(nb, !slot))
443 return -EEXIST;
444
445 amd_l3_disable_index(nb, cpu, slot, index);
446
447 return 0;
448}
449
450static ssize_t store_cache_disable(struct cacheinfo *this_leaf,
451 const char *buf, size_t count,
452 unsigned int slot)
453{
454 unsigned long val = 0;
455 int cpu, err = 0;
456 struct amd_northbridge *nb = this_leaf->priv;
457
458 if (!capable(CAP_SYS_ADMIN))
459 return -EPERM;
460
461 cpu = cpumask_first(&this_leaf->shared_cpu_map);
462
463 if (kstrtoul(buf, 10, &val) < 0)
464 return -EINVAL;
465
466 err = amd_set_l3_disable_slot(nb, cpu, slot, val);
467 if (err) {
468 if (err == -EEXIST)
469 pr_warn("L3 slot %d in use/index already disabled!\n",
470 slot);
471 return err;
472 }
473 return count;
474}
475
476#define STORE_CACHE_DISABLE(slot) \
477static ssize_t \
478cache_disable_##slot##_store(struct device *dev, \
479 struct device_attribute *attr, \
480 const char *buf, size_t count) \
481{ \
482 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
483 return store_cache_disable(this_leaf, buf, count, slot); \
484}
485STORE_CACHE_DISABLE(0)
486STORE_CACHE_DISABLE(1)
487
488static ssize_t subcaches_show(struct device *dev,
489 struct device_attribute *attr, char *buf)
490{
491 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
492 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
493
494 return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
495}
496
497static ssize_t subcaches_store(struct device *dev,
498 struct device_attribute *attr,
499 const char *buf, size_t count)
500{
501 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
502 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
503 unsigned long val;
504
505 if (!capable(CAP_SYS_ADMIN))
506 return -EPERM;
507
508 if (kstrtoul(buf, 16, &val) < 0)
509 return -EINVAL;
510
511 if (amd_set_subcaches(cpu, val))
512 return -EINVAL;
513
514 return count;
515}
516
517static DEVICE_ATTR_RW(cache_disable_0);
518static DEVICE_ATTR_RW(cache_disable_1);
519static DEVICE_ATTR_RW(subcaches);
520
521static umode_t
522cache_private_attrs_is_visible(struct kobject *kobj,
523 struct attribute *attr, int unused)
524{
525 struct device *dev = kobj_to_dev(kobj);
526 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
527 umode_t mode = attr->mode;
528
529 if (!this_leaf->priv)
530 return 0;
531
532 if ((attr == &dev_attr_subcaches.attr) &&
533 amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
534 return mode;
535
536 if ((attr == &dev_attr_cache_disable_0.attr ||
537 attr == &dev_attr_cache_disable_1.attr) &&
538 amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
539 return mode;
540
541 return 0;
542}
543
544static struct attribute_group cache_private_group = {
545 .is_visible = cache_private_attrs_is_visible,
546};
547
548static void init_amd_l3_attrs(void)
549{
550 int n = 1;
551 static struct attribute **amd_l3_attrs;
552
553 if (amd_l3_attrs) /* already initialized */
554 return;
555
556 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
557 n += 2;
558 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
559 n += 1;
560
561 amd_l3_attrs = kcalloc(n, sizeof(*amd_l3_attrs), GFP_KERNEL);
562 if (!amd_l3_attrs)
563 return;
564
565 n = 0;
566 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE)) {
567 amd_l3_attrs[n++] = &dev_attr_cache_disable_0.attr;
568 amd_l3_attrs[n++] = &dev_attr_cache_disable_1.attr;
569 }
570 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
571 amd_l3_attrs[n++] = &dev_attr_subcaches.attr;
572
573 cache_private_group.attrs = amd_l3_attrs;
574}
575
576const struct attribute_group *
577cache_get_priv_group(struct cacheinfo *this_leaf)
578{
579 struct amd_northbridge *nb = this_leaf->priv;
580
581 if (this_leaf->level < 3 || !nb)
582 return NULL;
583
584 if (nb && nb->l3_cache.indices)
585 init_amd_l3_attrs();
586
587 return &cache_private_group;
588}
589
590static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
591{
592 int node;
593
594 /* only for L3, and not in virtualized environments */
595 if (index < 3)
596 return;
597
598 node = topology_die_id(smp_processor_id());
599 this_leaf->nb = node_to_amd_nb(node);
600 if (this_leaf->nb && !this_leaf->nb->l3_cache.indices)
601 amd_calc_l3_indices(this_leaf->nb);
602}
603#else
604#define amd_init_l3_cache(x, y)
605#endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
606
607static int
608cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
609{
610 union _cpuid4_leaf_eax eax;
611 union _cpuid4_leaf_ebx ebx;
612 union _cpuid4_leaf_ecx ecx;
613 unsigned edx;
614
615 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
616 if (boot_cpu_has(X86_FEATURE_TOPOEXT))
617 cpuid_count(0x8000001d, index, &eax.full,
618 &ebx.full, &ecx.full, &edx);
619 else
620 amd_cpuid4(index, &eax, &ebx, &ecx);
621 amd_init_l3_cache(this_leaf, index);
622 } else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
623 cpuid_count(0x8000001d, index, &eax.full,
624 &ebx.full, &ecx.full, &edx);
625 amd_init_l3_cache(this_leaf, index);
626 } else {
627 cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
628 }
629
630 if (eax.split.type == CTYPE_NULL)
631 return -EIO; /* better error ? */
632
633 this_leaf->eax = eax;
634 this_leaf->ebx = ebx;
635 this_leaf->ecx = ecx;
636 this_leaf->size = (ecx.split.number_of_sets + 1) *
637 (ebx.split.coherency_line_size + 1) *
638 (ebx.split.physical_line_partition + 1) *
639 (ebx.split.ways_of_associativity + 1);
640 return 0;
641}
642
643static int find_num_cache_leaves(struct cpuinfo_x86 *c)
644{
645 unsigned int eax, ebx, ecx, edx, op;
646 union _cpuid4_leaf_eax cache_eax;
647 int i = -1;
648
649 if (c->x86_vendor == X86_VENDOR_AMD ||
650 c->x86_vendor == X86_VENDOR_HYGON)
651 op = 0x8000001d;
652 else
653 op = 4;
654
655 do {
656 ++i;
657 /* Do cpuid(op) loop to find out num_cache_leaves */
658 cpuid_count(op, i, &eax, &ebx, &ecx, &edx);
659 cache_eax.full = eax;
660 } while (cache_eax.split.type != CTYPE_NULL);
661 return i;
662}
663
664void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c)
665{
666 /*
667 * We may have multiple LLCs if L3 caches exist, so check if we
668 * have an L3 cache by looking at the L3 cache CPUID leaf.
669 */
670 if (!cpuid_edx(0x80000006))
671 return;
672
673 if (c->x86 < 0x17) {
674 /* LLC is at the node level. */
675 c->topo.llc_id = c->topo.die_id;
676 } else if (c->x86 == 0x17 && c->x86_model <= 0x1F) {
677 /*
678 * LLC is at the core complex level.
679 * Core complex ID is ApicId[3] for these processors.
680 */
681 c->topo.llc_id = c->topo.apicid >> 3;
682 } else {
683 /*
684 * LLC ID is calculated from the number of threads sharing the
685 * cache.
686 * */
687 u32 eax, ebx, ecx, edx, num_sharing_cache = 0;
688 u32 llc_index = find_num_cache_leaves(c) - 1;
689
690 cpuid_count(0x8000001d, llc_index, &eax, &ebx, &ecx, &edx);
691 if (eax)
692 num_sharing_cache = ((eax >> 14) & 0xfff) + 1;
693
694 if (num_sharing_cache) {
695 int bits = get_count_order(num_sharing_cache);
696
697 c->topo.llc_id = c->topo.apicid >> bits;
698 }
699 }
700}
701
702void cacheinfo_hygon_init_llc_id(struct cpuinfo_x86 *c)
703{
704 /*
705 * We may have multiple LLCs if L3 caches exist, so check if we
706 * have an L3 cache by looking at the L3 cache CPUID leaf.
707 */
708 if (!cpuid_edx(0x80000006))
709 return;
710
711 /*
712 * LLC is at the core complex level.
713 * Core complex ID is ApicId[3] for these processors.
714 */
715 c->topo.llc_id = c->topo.apicid >> 3;
716}
717
718void init_amd_cacheinfo(struct cpuinfo_x86 *c)
719{
720
721 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
722 num_cache_leaves = find_num_cache_leaves(c);
723 } else if (c->extended_cpuid_level >= 0x80000006) {
724 if (cpuid_edx(0x80000006) & 0xf000)
725 num_cache_leaves = 4;
726 else
727 num_cache_leaves = 3;
728 }
729}
730
731void init_hygon_cacheinfo(struct cpuinfo_x86 *c)
732{
733 num_cache_leaves = find_num_cache_leaves(c);
734}
735
736void init_intel_cacheinfo(struct cpuinfo_x86 *c)
737{
738 /* Cache sizes */
739 unsigned int l1i = 0, l1d = 0, l2 = 0, l3 = 0;
740 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
741 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
742 unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
743
744 if (c->cpuid_level > 3) {
745 static int is_initialized;
746
747 if (is_initialized == 0) {
748 /* Init num_cache_leaves from boot CPU */
749 num_cache_leaves = find_num_cache_leaves(c);
750 is_initialized++;
751 }
752
753 /*
754 * Whenever possible use cpuid(4), deterministic cache
755 * parameters cpuid leaf to find the cache details
756 */
757 for (i = 0; i < num_cache_leaves; i++) {
758 struct _cpuid4_info_regs this_leaf = {};
759 int retval;
760
761 retval = cpuid4_cache_lookup_regs(i, &this_leaf);
762 if (retval < 0)
763 continue;
764
765 switch (this_leaf.eax.split.level) {
766 case 1:
767 if (this_leaf.eax.split.type == CTYPE_DATA)
768 new_l1d = this_leaf.size/1024;
769 else if (this_leaf.eax.split.type == CTYPE_INST)
770 new_l1i = this_leaf.size/1024;
771 break;
772 case 2:
773 new_l2 = this_leaf.size/1024;
774 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
775 index_msb = get_count_order(num_threads_sharing);
776 l2_id = c->topo.apicid & ~((1 << index_msb) - 1);
777 break;
778 case 3:
779 new_l3 = this_leaf.size/1024;
780 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
781 index_msb = get_count_order(num_threads_sharing);
782 l3_id = c->topo.apicid & ~((1 << index_msb) - 1);
783 break;
784 default:
785 break;
786 }
787 }
788 }
789 /*
790 * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
791 * trace cache
792 */
793 if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
794 /* supports eax=2 call */
795 int j, n;
796 unsigned int regs[4];
797 unsigned char *dp = (unsigned char *)regs;
798 int only_trace = 0;
799
800 if (num_cache_leaves != 0 && c->x86 == 15)
801 only_trace = 1;
802
803 /* Number of times to iterate */
804 n = cpuid_eax(2) & 0xFF;
805
806 for (i = 0 ; i < n ; i++) {
807 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
808
809 /* If bit 31 is set, this is an unknown format */
810 for (j = 0 ; j < 3 ; j++)
811 if (regs[j] & (1 << 31))
812 regs[j] = 0;
813
814 /* Byte 0 is level count, not a descriptor */
815 for (j = 1 ; j < 16 ; j++) {
816 unsigned char des = dp[j];
817 unsigned char k = 0;
818
819 /* look up this descriptor in the table */
820 while (cache_table[k].descriptor != 0) {
821 if (cache_table[k].descriptor == des) {
822 if (only_trace && cache_table[k].cache_type != LVL_TRACE)
823 break;
824 switch (cache_table[k].cache_type) {
825 case LVL_1_INST:
826 l1i += cache_table[k].size;
827 break;
828 case LVL_1_DATA:
829 l1d += cache_table[k].size;
830 break;
831 case LVL_2:
832 l2 += cache_table[k].size;
833 break;
834 case LVL_3:
835 l3 += cache_table[k].size;
836 break;
837 }
838
839 break;
840 }
841
842 k++;
843 }
844 }
845 }
846 }
847
848 if (new_l1d)
849 l1d = new_l1d;
850
851 if (new_l1i)
852 l1i = new_l1i;
853
854 if (new_l2) {
855 l2 = new_l2;
856 c->topo.llc_id = l2_id;
857 c->topo.l2c_id = l2_id;
858 }
859
860 if (new_l3) {
861 l3 = new_l3;
862 c->topo.llc_id = l3_id;
863 }
864
865 /*
866 * If llc_id is not yet set, this means cpuid_level < 4 which in
867 * turns means that the only possibility is SMT (as indicated in
868 * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
869 * that SMT shares all caches, we can unconditionally set cpu_llc_id to
870 * c->topo.pkg_id.
871 */
872 if (c->topo.llc_id == BAD_APICID)
873 c->topo.llc_id = c->topo.pkg_id;
874
875 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
876
877 if (!l2)
878 cpu_detect_cache_sizes(c);
879}
880
881static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
882 struct _cpuid4_info_regs *base)
883{
884 struct cpu_cacheinfo *this_cpu_ci;
885 struct cacheinfo *this_leaf;
886 int i, sibling;
887
888 /*
889 * For L3, always use the pre-calculated cpu_llc_shared_mask
890 * to derive shared_cpu_map.
891 */
892 if (index == 3) {
893 for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
894 this_cpu_ci = get_cpu_cacheinfo(i);
895 if (!this_cpu_ci->info_list)
896 continue;
897 this_leaf = this_cpu_ci->info_list + index;
898 for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
899 if (!cpu_online(sibling))
900 continue;
901 cpumask_set_cpu(sibling,
902 &this_leaf->shared_cpu_map);
903 }
904 }
905 } else if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
906 unsigned int apicid, nshared, first, last;
907
908 nshared = base->eax.split.num_threads_sharing + 1;
909 apicid = cpu_data(cpu).topo.apicid;
910 first = apicid - (apicid % nshared);
911 last = first + nshared - 1;
912
913 for_each_online_cpu(i) {
914 this_cpu_ci = get_cpu_cacheinfo(i);
915 if (!this_cpu_ci->info_list)
916 continue;
917
918 apicid = cpu_data(i).topo.apicid;
919 if ((apicid < first) || (apicid > last))
920 continue;
921
922 this_leaf = this_cpu_ci->info_list + index;
923
924 for_each_online_cpu(sibling) {
925 apicid = cpu_data(sibling).topo.apicid;
926 if ((apicid < first) || (apicid > last))
927 continue;
928 cpumask_set_cpu(sibling,
929 &this_leaf->shared_cpu_map);
930 }
931 }
932 } else
933 return 0;
934
935 return 1;
936}
937
938static void __cache_cpumap_setup(unsigned int cpu, int index,
939 struct _cpuid4_info_regs *base)
940{
941 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
942 struct cacheinfo *this_leaf, *sibling_leaf;
943 unsigned long num_threads_sharing;
944 int index_msb, i;
945 struct cpuinfo_x86 *c = &cpu_data(cpu);
946
947 if (c->x86_vendor == X86_VENDOR_AMD ||
948 c->x86_vendor == X86_VENDOR_HYGON) {
949 if (__cache_amd_cpumap_setup(cpu, index, base))
950 return;
951 }
952
953 this_leaf = this_cpu_ci->info_list + index;
954 num_threads_sharing = 1 + base->eax.split.num_threads_sharing;
955
956 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
957 if (num_threads_sharing == 1)
958 return;
959
960 index_msb = get_count_order(num_threads_sharing);
961
962 for_each_online_cpu(i)
963 if (cpu_data(i).topo.apicid >> index_msb == c->topo.apicid >> index_msb) {
964 struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
965
966 if (i == cpu || !sib_cpu_ci->info_list)
967 continue;/* skip if itself or no cacheinfo */
968 sibling_leaf = sib_cpu_ci->info_list + index;
969 cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
970 cpumask_set_cpu(cpu, &sibling_leaf->shared_cpu_map);
971 }
972}
973
974static void ci_leaf_init(struct cacheinfo *this_leaf,
975 struct _cpuid4_info_regs *base)
976{
977 this_leaf->id = base->id;
978 this_leaf->attributes = CACHE_ID;
979 this_leaf->level = base->eax.split.level;
980 this_leaf->type = cache_type_map[base->eax.split.type];
981 this_leaf->coherency_line_size =
982 base->ebx.split.coherency_line_size + 1;
983 this_leaf->ways_of_associativity =
984 base->ebx.split.ways_of_associativity + 1;
985 this_leaf->size = base->size;
986 this_leaf->number_of_sets = base->ecx.split.number_of_sets + 1;
987 this_leaf->physical_line_partition =
988 base->ebx.split.physical_line_partition + 1;
989 this_leaf->priv = base->nb;
990}
991
992int init_cache_level(unsigned int cpu)
993{
994 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
995
996 if (!num_cache_leaves)
997 return -ENOENT;
998 if (!this_cpu_ci)
999 return -EINVAL;
1000 this_cpu_ci->num_levels = 3;
1001 this_cpu_ci->num_leaves = num_cache_leaves;
1002 return 0;
1003}
1004
1005/*
1006 * The max shared threads number comes from CPUID.4:EAX[25-14] with input
1007 * ECX as cache index. Then right shift apicid by the number's order to get
1008 * cache id for this cache node.
1009 */
1010static void get_cache_id(int cpu, struct _cpuid4_info_regs *id4_regs)
1011{
1012 struct cpuinfo_x86 *c = &cpu_data(cpu);
1013 unsigned long num_threads_sharing;
1014 int index_msb;
1015
1016 num_threads_sharing = 1 + id4_regs->eax.split.num_threads_sharing;
1017 index_msb = get_count_order(num_threads_sharing);
1018 id4_regs->id = c->topo.apicid >> index_msb;
1019}
1020
1021int populate_cache_leaves(unsigned int cpu)
1022{
1023 unsigned int idx, ret;
1024 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
1025 struct cacheinfo *this_leaf = this_cpu_ci->info_list;
1026 struct _cpuid4_info_regs id4_regs = {};
1027
1028 for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
1029 ret = cpuid4_cache_lookup_regs(idx, &id4_regs);
1030 if (ret)
1031 return ret;
1032 get_cache_id(cpu, &id4_regs);
1033 ci_leaf_init(this_leaf++, &id4_regs);
1034 __cache_cpumap_setup(cpu, idx, &id4_regs);
1035 }
1036 this_cpu_ci->cpu_map_populated = true;
1037
1038 return 0;
1039}
1040
1041/*
1042 * Disable and enable caches. Needed for changing MTRRs and the PAT MSR.
1043 *
1044 * Since we are disabling the cache don't allow any interrupts,
1045 * they would run extremely slow and would only increase the pain.
1046 *
1047 * The caller must ensure that local interrupts are disabled and
1048 * are reenabled after cache_enable() has been called.
1049 */
1050static unsigned long saved_cr4;
1051static DEFINE_RAW_SPINLOCK(cache_disable_lock);
1052
1053void cache_disable(void) __acquires(cache_disable_lock)
1054{
1055 unsigned long cr0;
1056
1057 /*
1058 * Note that this is not ideal
1059 * since the cache is only flushed/disabled for this CPU while the
1060 * MTRRs are changed, but changing this requires more invasive
1061 * changes to the way the kernel boots
1062 */
1063
1064 raw_spin_lock(&cache_disable_lock);
1065
1066 /* Enter the no-fill (CD=1, NW=0) cache mode and flush caches. */
1067 cr0 = read_cr0() | X86_CR0_CD;
1068 write_cr0(cr0);
1069
1070 /*
1071 * Cache flushing is the most time-consuming step when programming
1072 * the MTRRs. Fortunately, as per the Intel Software Development
1073 * Manual, we can skip it if the processor supports cache self-
1074 * snooping.
1075 */
1076 if (!static_cpu_has(X86_FEATURE_SELFSNOOP))
1077 wbinvd();
1078
1079 /* Save value of CR4 and clear Page Global Enable (bit 7) */
1080 if (cpu_feature_enabled(X86_FEATURE_PGE)) {
1081 saved_cr4 = __read_cr4();
1082 __write_cr4(saved_cr4 & ~X86_CR4_PGE);
1083 }
1084
1085 /* Flush all TLBs via a mov %cr3, %reg; mov %reg, %cr3 */
1086 count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
1087 flush_tlb_local();
1088
1089 if (cpu_feature_enabled(X86_FEATURE_MTRR))
1090 mtrr_disable();
1091
1092 /* Again, only flush caches if we have to. */
1093 if (!static_cpu_has(X86_FEATURE_SELFSNOOP))
1094 wbinvd();
1095}
1096
1097void cache_enable(void) __releases(cache_disable_lock)
1098{
1099 /* Flush TLBs (no need to flush caches - they are disabled) */
1100 count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
1101 flush_tlb_local();
1102
1103 if (cpu_feature_enabled(X86_FEATURE_MTRR))
1104 mtrr_enable();
1105
1106 /* Enable caches */
1107 write_cr0(read_cr0() & ~X86_CR0_CD);
1108
1109 /* Restore value of CR4 */
1110 if (cpu_feature_enabled(X86_FEATURE_PGE))
1111 __write_cr4(saved_cr4);
1112
1113 raw_spin_unlock(&cache_disable_lock);
1114}
1115
1116static void cache_cpu_init(void)
1117{
1118 unsigned long flags;
1119
1120 local_irq_save(flags);
1121 cache_disable();
1122
1123 if (memory_caching_control & CACHE_MTRR)
1124 mtrr_generic_set_state();
1125
1126 if (memory_caching_control & CACHE_PAT)
1127 pat_cpu_init();
1128
1129 cache_enable();
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);