1 /*
2 * Routines to identify caches on Intel CPU.
3 *
4 * Changes:
5 * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
6 * Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
7 * Andi Kleen / Andreas Herrmann : CPUID4 emulation on AMD.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/cacheinfo.h>
12 #include <linux/cpu.h>
13 #include <linux/sched.h>
14 #include <linux/sysfs.h>
15 #include <linux/pci.h>
16
17 #include <asm/cpufeature.h>
18 #include <asm/amd_nb.h>
19 #include <asm/smp.h>
20
21 #define LVL_1_INST 1
22 #define LVL_1_DATA 2
23 #define LVL_2 3
24 #define LVL_3 4
25 #define LVL_TRACE 5
26
27 struct _cache_table {
28 unsigned char descriptor;
29 char cache_type;
30 short size;
31 };
32
33 #define MB(x) ((x) * 1024)
34
35 /* All the cache descriptor types we care about (no TLB or
36 trace cache entries) */
37
38 static const struct _cache_table cache_table[] =
39 {
40 { 0x06, LVL_1_INST, 8 }, /* 4-way set assoc, 32 byte line size */
41 { 0x08, LVL_1_INST, 16 }, /* 4-way set assoc, 32 byte line size */
42 { 0x09, LVL_1_INST, 32 }, /* 4-way set assoc, 64 byte line size */
43 { 0x0a, LVL_1_DATA, 8 }, /* 2 way set assoc, 32 byte line size */
44 { 0x0c, LVL_1_DATA, 16 }, /* 4-way set assoc, 32 byte line size */
45 { 0x0d, LVL_1_DATA, 16 }, /* 4-way set assoc, 64 byte line size */
46 { 0x0e, LVL_1_DATA, 24 }, /* 6-way set assoc, 64 byte line size */
47 { 0x21, LVL_2, 256 }, /* 8-way set assoc, 64 byte line size */
48 { 0x22, LVL_3, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
49 { 0x23, LVL_3, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
50 { 0x25, LVL_3, MB(2) }, /* 8-way set assoc, sectored cache, 64 byte line size */
51 { 0x29, LVL_3, MB(4) }, /* 8-way set assoc, sectored cache, 64 byte line size */
52 { 0x2c, LVL_1_DATA, 32 }, /* 8-way set assoc, 64 byte line size */
53 { 0x30, LVL_1_INST, 32 }, /* 8-way set assoc, 64 byte line size */
54 { 0x39, LVL_2, 128 }, /* 4-way set assoc, sectored cache, 64 byte line size */
55 { 0x3a, LVL_2, 192 }, /* 6-way set assoc, sectored cache, 64 byte line size */
56 { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
57 { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
58 { 0x3d, LVL_2, 384 }, /* 6-way set assoc, sectored cache, 64 byte line size */
59 { 0x3e, LVL_2, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
60 { 0x3f, LVL_2, 256 }, /* 2-way set assoc, 64 byte line size */
61 { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
62 { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
63 { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
64 { 0x44, LVL_2, MB(1) }, /* 4-way set assoc, 32 byte line size */
65 { 0x45, LVL_2, MB(2) }, /* 4-way set assoc, 32 byte line size */
66 { 0x46, LVL_3, MB(4) }, /* 4-way set assoc, 64 byte line size */
67 { 0x47, LVL_3, MB(8) }, /* 8-way set assoc, 64 byte line size */
68 { 0x48, LVL_2, MB(3) }, /* 12-way set assoc, 64 byte line size */
69 { 0x49, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
70 { 0x4a, LVL_3, MB(6) }, /* 12-way set assoc, 64 byte line size */
71 { 0x4b, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
72 { 0x4c, LVL_3, MB(12) }, /* 12-way set assoc, 64 byte line size */
73 { 0x4d, LVL_3, MB(16) }, /* 16-way set assoc, 64 byte line size */
74 { 0x4e, LVL_2, MB(6) }, /* 24-way set assoc, 64 byte line size */
75 { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
76 { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
77 { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
78 { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
79 { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
80 { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
81 { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
82 { 0x73, LVL_TRACE, 64 }, /* 8-way set assoc */
83 { 0x78, LVL_2, MB(1) }, /* 4-way set assoc, 64 byte line size */
84 { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
85 { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
86 { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
87 { 0x7c, LVL_2, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
88 { 0x7d, LVL_2, MB(2) }, /* 8-way set assoc, 64 byte line size */
89 { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
90 { 0x80, LVL_2, 512 }, /* 8-way set assoc, 64 byte line size */
91 { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
92 { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
93 { 0x84, LVL_2, MB(1) }, /* 8-way set assoc, 32 byte line size */
94 { 0x85, LVL_2, MB(2) }, /* 8-way set assoc, 32 byte line size */
95 { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
96 { 0x87, LVL_2, MB(1) }, /* 8-way set assoc, 64 byte line size */
97 { 0xd0, LVL_3, 512 }, /* 4-way set assoc, 64 byte line size */
98 { 0xd1, LVL_3, MB(1) }, /* 4-way set assoc, 64 byte line size */
99 { 0xd2, LVL_3, MB(2) }, /* 4-way set assoc, 64 byte line size */
100 { 0xd6, LVL_3, MB(1) }, /* 8-way set assoc, 64 byte line size */
101 { 0xd7, LVL_3, MB(2) }, /* 8-way set assoc, 64 byte line size */
102 { 0xd8, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
103 { 0xdc, LVL_3, MB(2) }, /* 12-way set assoc, 64 byte line size */
104 { 0xdd, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
105 { 0xde, LVL_3, MB(8) }, /* 12-way set assoc, 64 byte line size */
106 { 0xe2, LVL_3, MB(2) }, /* 16-way set assoc, 64 byte line size */
107 { 0xe3, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
108 { 0xe4, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
109 { 0xea, LVL_3, MB(12) }, /* 24-way set assoc, 64 byte line size */
110 { 0xeb, LVL_3, MB(18) }, /* 24-way set assoc, 64 byte line size */
111 { 0xec, LVL_3, MB(24) }, /* 24-way set assoc, 64 byte line size */
112 { 0x00, 0, 0}
113 };
114
115
116 enum _cache_type {
117 CTYPE_NULL = 0,
118 CTYPE_DATA = 1,
119 CTYPE_INST = 2,
120 CTYPE_UNIFIED = 3
121 };
122
123 union _cpuid4_leaf_eax {
124 struct {
125 enum _cache_type type:5;
126 unsigned int level:3;
127 unsigned int is_self_initializing:1;
128 unsigned int is_fully_associative:1;
129 unsigned int reserved:4;
130 unsigned int num_threads_sharing:12;
131 unsigned int num_cores_on_die:6;
132 } split;
133 u32 full;
134 };
135
136 union _cpuid4_leaf_ebx {
137 struct {
138 unsigned int coherency_line_size:12;
139 unsigned int physical_line_partition:10;
140 unsigned int ways_of_associativity:10;
141 } split;
142 u32 full;
143 };
144
145 union _cpuid4_leaf_ecx {
146 struct {
147 unsigned int number_of_sets:32;
148 } split;
149 u32 full;
150 };
151
152 struct _cpuid4_info_regs {
153 union _cpuid4_leaf_eax eax;
154 union _cpuid4_leaf_ebx ebx;
155 union _cpuid4_leaf_ecx ecx;
156 unsigned long size;
157 struct amd_northbridge *nb;
158 };
159
160 static unsigned short num_cache_leaves;
161
162 /* AMD doesn't have CPUID4. Emulate it here to report the same
163 information to the user. This makes some assumptions about the machine:
164 L2 not shared, no SMT etc. that is currently true on AMD CPUs.
165
166 In theory the TLBs could be reported as fake type (they are in "dummy").
167 Maybe later */
168 union l1_cache {
169 struct {
170 unsigned line_size:8;
171 unsigned lines_per_tag:8;
172 unsigned assoc:8;
173 unsigned size_in_kb:8;
174 };
175 unsigned val;
176 };
177
178 union l2_cache {
179 struct {
180 unsigned line_size:8;
181 unsigned lines_per_tag:4;
182 unsigned assoc:4;
183 unsigned size_in_kb:16;
184 };
185 unsigned val;
186 };
187
188 union l3_cache {
189 struct {
190 unsigned line_size:8;
191 unsigned lines_per_tag:4;
192 unsigned assoc:4;
193 unsigned res:2;
194 unsigned size_encoded:14;
195 };
196 unsigned val;
197 };
198
199 static const unsigned short assocs[] = {
200 [1] = 1,
201 [2] = 2,
202 [4] = 4,
203 [6] = 8,
204 [8] = 16,
205 [0xa] = 32,
206 [0xb] = 48,
207 [0xc] = 64,
208 [0xd] = 96,
209 [0xe] = 128,
210 [0xf] = 0xffff /* fully associative - no way to show this currently */
211 };
212
213 static const unsigned char levels[] = { 1, 1, 2, 3 };
214 static const unsigned char types[] = { 1, 2, 3, 3 };
215
216 static const enum cache_type cache_type_map[] = {
217 [CTYPE_NULL] = CACHE_TYPE_NOCACHE,
218 [CTYPE_DATA] = CACHE_TYPE_DATA,
219 [CTYPE_INST] = CACHE_TYPE_INST,
220 [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
221 };
222
223 static void
amd_cpuid4(int leaf,union _cpuid4_leaf_eax * eax,union _cpuid4_leaf_ebx * ebx,union _cpuid4_leaf_ecx * ecx)224 amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
225 union _cpuid4_leaf_ebx *ebx,
226 union _cpuid4_leaf_ecx *ecx)
227 {
228 unsigned dummy;
229 unsigned line_size, lines_per_tag, assoc, size_in_kb;
230 union l1_cache l1i, l1d;
231 union l2_cache l2;
232 union l3_cache l3;
233 union l1_cache *l1 = &l1d;
234
235 eax->full = 0;
236 ebx->full = 0;
237 ecx->full = 0;
238
239 cpuid(0x80000005, &dummy, &dummy, &l1d.val, &l1i.val);
240 cpuid(0x80000006, &dummy, &dummy, &l2.val, &l3.val);
241
242 switch (leaf) {
243 case 1:
244 l1 = &l1i;
245 case 0:
246 if (!l1->val)
247 return;
248 assoc = assocs[l1->assoc];
249 line_size = l1->line_size;
250 lines_per_tag = l1->lines_per_tag;
251 size_in_kb = l1->size_in_kb;
252 break;
253 case 2:
254 if (!l2.val)
255 return;
256 assoc = assocs[l2.assoc];
257 line_size = l2.line_size;
258 lines_per_tag = l2.lines_per_tag;
259 /* cpu_data has errata corrections for K7 applied */
260 size_in_kb = __this_cpu_read(cpu_info.x86_cache_size);
261 break;
262 case 3:
263 if (!l3.val)
264 return;
265 assoc = assocs[l3.assoc];
266 line_size = l3.line_size;
267 lines_per_tag = l3.lines_per_tag;
268 size_in_kb = l3.size_encoded * 512;
269 if (boot_cpu_has(X86_FEATURE_AMD_DCM)) {
270 size_in_kb = size_in_kb >> 1;
271 assoc = assoc >> 1;
272 }
273 break;
274 default:
275 return;
276 }
277
278 eax->split.is_self_initializing = 1;
279 eax->split.type = types[leaf];
280 eax->split.level = levels[leaf];
281 eax->split.num_threads_sharing = 0;
282 eax->split.num_cores_on_die = __this_cpu_read(cpu_info.x86_max_cores) - 1;
283
284
285 if (assoc == 0xffff)
286 eax->split.is_fully_associative = 1;
287 ebx->split.coherency_line_size = line_size - 1;
288 ebx->split.ways_of_associativity = assoc - 1;
289 ebx->split.physical_line_partition = lines_per_tag - 1;
290 ecx->split.number_of_sets = (size_in_kb * 1024) / line_size /
291 (ebx->split.ways_of_associativity + 1) - 1;
292 }
293
294 #if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
295
296 /*
297 * L3 cache descriptors
298 */
amd_calc_l3_indices(struct amd_northbridge * nb)299 static void amd_calc_l3_indices(struct amd_northbridge *nb)
300 {
301 struct amd_l3_cache *l3 = &nb->l3_cache;
302 unsigned int sc0, sc1, sc2, sc3;
303 u32 val = 0;
304
305 pci_read_config_dword(nb->misc, 0x1C4, &val);
306
307 /* calculate subcache sizes */
308 l3->subcaches[0] = sc0 = !(val & BIT(0));
309 l3->subcaches[1] = sc1 = !(val & BIT(4));
310
311 if (boot_cpu_data.x86 == 0x15) {
312 l3->subcaches[0] = sc0 += !(val & BIT(1));
313 l3->subcaches[1] = sc1 += !(val & BIT(5));
314 }
315
316 l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
317 l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
318
319 l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
320 }
321
322 /*
323 * check whether a slot used for disabling an L3 index is occupied.
324 * @l3: L3 cache descriptor
325 * @slot: slot number (0..1)
326 *
327 * @returns: the disabled index if used or negative value if slot free.
328 */
amd_get_l3_disable_slot(struct amd_northbridge * nb,unsigned slot)329 static int amd_get_l3_disable_slot(struct amd_northbridge *nb, unsigned slot)
330 {
331 unsigned int reg = 0;
332
333 pci_read_config_dword(nb->misc, 0x1BC + slot * 4, ®);
334
335 /* check whether this slot is activated already */
336 if (reg & (3UL << 30))
337 return reg & 0xfff;
338
339 return -1;
340 }
341
show_cache_disable(struct cacheinfo * this_leaf,char * buf,unsigned int slot)342 static ssize_t show_cache_disable(struct cacheinfo *this_leaf, char *buf,
343 unsigned int slot)
344 {
345 int index;
346 struct amd_northbridge *nb = this_leaf->priv;
347
348 index = amd_get_l3_disable_slot(nb, slot);
349 if (index >= 0)
350 return sprintf(buf, "%d\n", index);
351
352 return sprintf(buf, "FREE\n");
353 }
354
355 #define SHOW_CACHE_DISABLE(slot) \
356 static ssize_t \
357 cache_disable_##slot##_show(struct device *dev, \
358 struct device_attribute *attr, char *buf) \
359 { \
360 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
361 return show_cache_disable(this_leaf, buf, slot); \
362 }
363 SHOW_CACHE_DISABLE(0)
364 SHOW_CACHE_DISABLE(1)
365
amd_l3_disable_index(struct amd_northbridge * nb,int cpu,unsigned slot,unsigned long idx)366 static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
367 unsigned slot, unsigned long idx)
368 {
369 int i;
370
371 idx |= BIT(30);
372
373 /*
374 * disable index in all 4 subcaches
375 */
376 for (i = 0; i < 4; i++) {
377 u32 reg = idx | (i << 20);
378
379 if (!nb->l3_cache.subcaches[i])
380 continue;
381
382 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
383
384 /*
385 * We need to WBINVD on a core on the node containing the L3
386 * cache which indices we disable therefore a simple wbinvd()
387 * is not sufficient.
388 */
389 wbinvd_on_cpu(cpu);
390
391 reg |= BIT(31);
392 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
393 }
394 }
395
396 /*
397 * disable a L3 cache index by using a disable-slot
398 *
399 * @l3: L3 cache descriptor
400 * @cpu: A CPU on the node containing the L3 cache
401 * @slot: slot number (0..1)
402 * @index: index to disable
403 *
404 * @return: 0 on success, error status on failure
405 */
amd_set_l3_disable_slot(struct amd_northbridge * nb,int cpu,unsigned slot,unsigned long index)406 static int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu,
407 unsigned slot, unsigned long index)
408 {
409 int ret = 0;
410
411 /* check if @slot is already used or the index is already disabled */
412 ret = amd_get_l3_disable_slot(nb, slot);
413 if (ret >= 0)
414 return -EEXIST;
415
416 if (index > nb->l3_cache.indices)
417 return -EINVAL;
418
419 /* check whether the other slot has disabled the same index already */
420 if (index == amd_get_l3_disable_slot(nb, !slot))
421 return -EEXIST;
422
423 amd_l3_disable_index(nb, cpu, slot, index);
424
425 return 0;
426 }
427
store_cache_disable(struct cacheinfo * this_leaf,const char * buf,size_t count,unsigned int slot)428 static ssize_t store_cache_disable(struct cacheinfo *this_leaf,
429 const char *buf, size_t count,
430 unsigned int slot)
431 {
432 unsigned long val = 0;
433 int cpu, err = 0;
434 struct amd_northbridge *nb = this_leaf->priv;
435
436 if (!capable(CAP_SYS_ADMIN))
437 return -EPERM;
438
439 cpu = cpumask_first(&this_leaf->shared_cpu_map);
440
441 if (kstrtoul(buf, 10, &val) < 0)
442 return -EINVAL;
443
444 err = amd_set_l3_disable_slot(nb, cpu, slot, val);
445 if (err) {
446 if (err == -EEXIST)
447 pr_warning("L3 slot %d in use/index already disabled!\n",
448 slot);
449 return err;
450 }
451 return count;
452 }
453
454 #define STORE_CACHE_DISABLE(slot) \
455 static ssize_t \
456 cache_disable_##slot##_store(struct device *dev, \
457 struct device_attribute *attr, \
458 const char *buf, size_t count) \
459 { \
460 struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
461 return store_cache_disable(this_leaf, buf, count, slot); \
462 }
463 STORE_CACHE_DISABLE(0)
464 STORE_CACHE_DISABLE(1)
465
subcaches_show(struct device * dev,struct device_attribute * attr,char * buf)466 static ssize_t subcaches_show(struct device *dev,
467 struct device_attribute *attr, char *buf)
468 {
469 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
470 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
471
472 return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
473 }
474
subcaches_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)475 static ssize_t subcaches_store(struct device *dev,
476 struct device_attribute *attr,
477 const char *buf, size_t count)
478 {
479 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
480 int cpu = cpumask_first(&this_leaf->shared_cpu_map);
481 unsigned long val;
482
483 if (!capable(CAP_SYS_ADMIN))
484 return -EPERM;
485
486 if (kstrtoul(buf, 16, &val) < 0)
487 return -EINVAL;
488
489 if (amd_set_subcaches(cpu, val))
490 return -EINVAL;
491
492 return count;
493 }
494
495 static DEVICE_ATTR_RW(cache_disable_0);
496 static DEVICE_ATTR_RW(cache_disable_1);
497 static DEVICE_ATTR_RW(subcaches);
498
499 static umode_t
cache_private_attrs_is_visible(struct kobject * kobj,struct attribute * attr,int unused)500 cache_private_attrs_is_visible(struct kobject *kobj,
501 struct attribute *attr, int unused)
502 {
503 struct device *dev = kobj_to_dev(kobj);
504 struct cacheinfo *this_leaf = dev_get_drvdata(dev);
505 umode_t mode = attr->mode;
506
507 if (!this_leaf->priv)
508 return 0;
509
510 if ((attr == &dev_attr_subcaches.attr) &&
511 amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
512 return mode;
513
514 if ((attr == &dev_attr_cache_disable_0.attr ||
515 attr == &dev_attr_cache_disable_1.attr) &&
516 amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
517 return mode;
518
519 return 0;
520 }
521
522 static struct attribute_group cache_private_group = {
523 .is_visible = cache_private_attrs_is_visible,
524 };
525
init_amd_l3_attrs(void)526 static void init_amd_l3_attrs(void)
527 {
528 int n = 1;
529 static struct attribute **amd_l3_attrs;
530
531 if (amd_l3_attrs) /* already initialized */
532 return;
533
534 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
535 n += 2;
536 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
537 n += 1;
538
539 amd_l3_attrs = kcalloc(n, sizeof(*amd_l3_attrs), GFP_KERNEL);
540 if (!amd_l3_attrs)
541 return;
542
543 n = 0;
544 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE)) {
545 amd_l3_attrs[n++] = &dev_attr_cache_disable_0.attr;
546 amd_l3_attrs[n++] = &dev_attr_cache_disable_1.attr;
547 }
548 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
549 amd_l3_attrs[n++] = &dev_attr_subcaches.attr;
550
551 cache_private_group.attrs = amd_l3_attrs;
552 }
553
554 const struct attribute_group *
cache_get_priv_group(struct cacheinfo * this_leaf)555 cache_get_priv_group(struct cacheinfo *this_leaf)
556 {
557 struct amd_northbridge *nb = this_leaf->priv;
558
559 if (this_leaf->level < 3 || !nb)
560 return NULL;
561
562 if (nb && nb->l3_cache.indices)
563 init_amd_l3_attrs();
564
565 return &cache_private_group;
566 }
567
amd_init_l3_cache(struct _cpuid4_info_regs * this_leaf,int index)568 static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
569 {
570 int node;
571
572 /* only for L3, and not in virtualized environments */
573 if (index < 3)
574 return;
575
576 node = amd_get_nb_id(smp_processor_id());
577 this_leaf->nb = node_to_amd_nb(node);
578 if (this_leaf->nb && !this_leaf->nb->l3_cache.indices)
579 amd_calc_l3_indices(this_leaf->nb);
580 }
581 #else
582 #define amd_init_l3_cache(x, y)
583 #endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
584
585 static int
cpuid4_cache_lookup_regs(int index,struct _cpuid4_info_regs * this_leaf)586 cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
587 {
588 union _cpuid4_leaf_eax eax;
589 union _cpuid4_leaf_ebx ebx;
590 union _cpuid4_leaf_ecx ecx;
591 unsigned edx;
592
593 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
594 if (boot_cpu_has(X86_FEATURE_TOPOEXT))
595 cpuid_count(0x8000001d, index, &eax.full,
596 &ebx.full, &ecx.full, &edx);
597 else
598 amd_cpuid4(index, &eax, &ebx, &ecx);
599 amd_init_l3_cache(this_leaf, index);
600 } else {
601 cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
602 }
603
604 if (eax.split.type == CTYPE_NULL)
605 return -EIO; /* better error ? */
606
607 this_leaf->eax = eax;
608 this_leaf->ebx = ebx;
609 this_leaf->ecx = ecx;
610 this_leaf->size = (ecx.split.number_of_sets + 1) *
611 (ebx.split.coherency_line_size + 1) *
612 (ebx.split.physical_line_partition + 1) *
613 (ebx.split.ways_of_associativity + 1);
614 return 0;
615 }
616
find_num_cache_leaves(struct cpuinfo_x86 * c)617 static int find_num_cache_leaves(struct cpuinfo_x86 *c)
618 {
619 unsigned int eax, ebx, ecx, edx, op;
620 union _cpuid4_leaf_eax cache_eax;
621 int i = -1;
622
623 if (c->x86_vendor == X86_VENDOR_AMD)
624 op = 0x8000001d;
625 else
626 op = 4;
627
628 do {
629 ++i;
630 /* Do cpuid(op) loop to find out num_cache_leaves */
631 cpuid_count(op, i, &eax, &ebx, &ecx, &edx);
632 cache_eax.full = eax;
633 } while (cache_eax.split.type != CTYPE_NULL);
634 return i;
635 }
636
init_amd_cacheinfo(struct cpuinfo_x86 * c)637 void init_amd_cacheinfo(struct cpuinfo_x86 *c)
638 {
639
640 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
641 num_cache_leaves = find_num_cache_leaves(c);
642 } else if (c->extended_cpuid_level >= 0x80000006) {
643 if (cpuid_edx(0x80000006) & 0xf000)
644 num_cache_leaves = 4;
645 else
646 num_cache_leaves = 3;
647 }
648 }
649
init_intel_cacheinfo(struct cpuinfo_x86 * c)650 unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c)
651 {
652 /* Cache sizes */
653 unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0;
654 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
655 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
656 unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
657 #ifdef CONFIG_SMP
658 unsigned int cpu = c->cpu_index;
659 #endif
660
661 if (c->cpuid_level > 3) {
662 static int is_initialized;
663
664 if (is_initialized == 0) {
665 /* Init num_cache_leaves from boot CPU */
666 num_cache_leaves = find_num_cache_leaves(c);
667 is_initialized++;
668 }
669
670 /*
671 * Whenever possible use cpuid(4), deterministic cache
672 * parameters cpuid leaf to find the cache details
673 */
674 for (i = 0; i < num_cache_leaves; i++) {
675 struct _cpuid4_info_regs this_leaf = {};
676 int retval;
677
678 retval = cpuid4_cache_lookup_regs(i, &this_leaf);
679 if (retval < 0)
680 continue;
681
682 switch (this_leaf.eax.split.level) {
683 case 1:
684 if (this_leaf.eax.split.type == CTYPE_DATA)
685 new_l1d = this_leaf.size/1024;
686 else if (this_leaf.eax.split.type == CTYPE_INST)
687 new_l1i = this_leaf.size/1024;
688 break;
689 case 2:
690 new_l2 = this_leaf.size/1024;
691 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
692 index_msb = get_count_order(num_threads_sharing);
693 l2_id = c->apicid & ~((1 << index_msb) - 1);
694 break;
695 case 3:
696 new_l3 = this_leaf.size/1024;
697 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
698 index_msb = get_count_order(num_threads_sharing);
699 l3_id = c->apicid & ~((1 << index_msb) - 1);
700 break;
701 default:
702 break;
703 }
704 }
705 }
706 /*
707 * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
708 * trace cache
709 */
710 if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
711 /* supports eax=2 call */
712 int j, n;
713 unsigned int regs[4];
714 unsigned char *dp = (unsigned char *)regs;
715 int only_trace = 0;
716
717 if (num_cache_leaves != 0 && c->x86 == 15)
718 only_trace = 1;
719
720 /* Number of times to iterate */
721 n = cpuid_eax(2) & 0xFF;
722
723 for (i = 0 ; i < n ; i++) {
724 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
725
726 /* If bit 31 is set, this is an unknown format */
727 for (j = 0 ; j < 3 ; j++)
728 if (regs[j] & (1 << 31))
729 regs[j] = 0;
730
731 /* Byte 0 is level count, not a descriptor */
732 for (j = 1 ; j < 16 ; j++) {
733 unsigned char des = dp[j];
734 unsigned char k = 0;
735
736 /* look up this descriptor in the table */
737 while (cache_table[k].descriptor != 0) {
738 if (cache_table[k].descriptor == des) {
739 if (only_trace && cache_table[k].cache_type != LVL_TRACE)
740 break;
741 switch (cache_table[k].cache_type) {
742 case LVL_1_INST:
743 l1i += cache_table[k].size;
744 break;
745 case LVL_1_DATA:
746 l1d += cache_table[k].size;
747 break;
748 case LVL_2:
749 l2 += cache_table[k].size;
750 break;
751 case LVL_3:
752 l3 += cache_table[k].size;
753 break;
754 case LVL_TRACE:
755 trace += cache_table[k].size;
756 break;
757 }
758
759 break;
760 }
761
762 k++;
763 }
764 }
765 }
766 }
767
768 if (new_l1d)
769 l1d = new_l1d;
770
771 if (new_l1i)
772 l1i = new_l1i;
773
774 if (new_l2) {
775 l2 = new_l2;
776 #ifdef CONFIG_SMP
777 per_cpu(cpu_llc_id, cpu) = l2_id;
778 #endif
779 }
780
781 if (new_l3) {
782 l3 = new_l3;
783 #ifdef CONFIG_SMP
784 per_cpu(cpu_llc_id, cpu) = l3_id;
785 #endif
786 }
787
788 #ifdef CONFIG_SMP
789 /*
790 * If cpu_llc_id is not yet set, this means cpuid_level < 4 which in
791 * turns means that the only possibility is SMT (as indicated in
792 * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
793 * that SMT shares all caches, we can unconditionally set cpu_llc_id to
794 * c->phys_proc_id.
795 */
796 if (per_cpu(cpu_llc_id, cpu) == BAD_APICID)
797 per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
798 #endif
799
800 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
801
802 return l2;
803 }
804
__cache_amd_cpumap_setup(unsigned int cpu,int index,struct _cpuid4_info_regs * base)805 static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
806 struct _cpuid4_info_regs *base)
807 {
808 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
809 struct cacheinfo *this_leaf;
810 int i, sibling;
811
812 if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
813 unsigned int apicid, nshared, first, last;
814
815 this_leaf = this_cpu_ci->info_list + index;
816 nshared = base->eax.split.num_threads_sharing + 1;
817 apicid = cpu_data(cpu).apicid;
818 first = apicid - (apicid % nshared);
819 last = first + nshared - 1;
820
821 for_each_online_cpu(i) {
822 this_cpu_ci = get_cpu_cacheinfo(i);
823 if (!this_cpu_ci->info_list)
824 continue;
825
826 apicid = cpu_data(i).apicid;
827 if ((apicid < first) || (apicid > last))
828 continue;
829
830 this_leaf = this_cpu_ci->info_list + index;
831
832 for_each_online_cpu(sibling) {
833 apicid = cpu_data(sibling).apicid;
834 if ((apicid < first) || (apicid > last))
835 continue;
836 cpumask_set_cpu(sibling,
837 &this_leaf->shared_cpu_map);
838 }
839 }
840 } else if (index == 3) {
841 for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
842 this_cpu_ci = get_cpu_cacheinfo(i);
843 if (!this_cpu_ci->info_list)
844 continue;
845 this_leaf = this_cpu_ci->info_list + index;
846 for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
847 if (!cpu_online(sibling))
848 continue;
849 cpumask_set_cpu(sibling,
850 &this_leaf->shared_cpu_map);
851 }
852 }
853 } else
854 return 0;
855
856 return 1;
857 }
858
__cache_cpumap_setup(unsigned int cpu,int index,struct _cpuid4_info_regs * base)859 static void __cache_cpumap_setup(unsigned int cpu, int index,
860 struct _cpuid4_info_regs *base)
861 {
862 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
863 struct cacheinfo *this_leaf, *sibling_leaf;
864 unsigned long num_threads_sharing;
865 int index_msb, i;
866 struct cpuinfo_x86 *c = &cpu_data(cpu);
867
868 if (c->x86_vendor == X86_VENDOR_AMD) {
869 if (__cache_amd_cpumap_setup(cpu, index, base))
870 return;
871 }
872
873 this_leaf = this_cpu_ci->info_list + index;
874 num_threads_sharing = 1 + base->eax.split.num_threads_sharing;
875
876 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
877 if (num_threads_sharing == 1)
878 return;
879
880 index_msb = get_count_order(num_threads_sharing);
881
882 for_each_online_cpu(i)
883 if (cpu_data(i).apicid >> index_msb == c->apicid >> index_msb) {
884 struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
885
886 if (i == cpu || !sib_cpu_ci->info_list)
887 continue;/* skip if itself or no cacheinfo */
888 sibling_leaf = sib_cpu_ci->info_list + index;
889 cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
890 cpumask_set_cpu(cpu, &sibling_leaf->shared_cpu_map);
891 }
892 }
893
ci_leaf_init(struct cacheinfo * this_leaf,struct _cpuid4_info_regs * base)894 static void ci_leaf_init(struct cacheinfo *this_leaf,
895 struct _cpuid4_info_regs *base)
896 {
897 this_leaf->level = base->eax.split.level;
898 this_leaf->type = cache_type_map[base->eax.split.type];
899 this_leaf->coherency_line_size =
900 base->ebx.split.coherency_line_size + 1;
901 this_leaf->ways_of_associativity =
902 base->ebx.split.ways_of_associativity + 1;
903 this_leaf->size = base->size;
904 this_leaf->number_of_sets = base->ecx.split.number_of_sets + 1;
905 this_leaf->physical_line_partition =
906 base->ebx.split.physical_line_partition + 1;
907 this_leaf->priv = base->nb;
908 }
909
__init_cache_level(unsigned int cpu)910 static int __init_cache_level(unsigned int cpu)
911 {
912 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
913
914 if (!num_cache_leaves)
915 return -ENOENT;
916 if (!this_cpu_ci)
917 return -EINVAL;
918 this_cpu_ci->num_levels = 3;
919 this_cpu_ci->num_leaves = num_cache_leaves;
920 return 0;
921 }
922
__populate_cache_leaves(unsigned int cpu)923 static int __populate_cache_leaves(unsigned int cpu)
924 {
925 unsigned int idx, ret;
926 struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
927 struct cacheinfo *this_leaf = this_cpu_ci->info_list;
928 struct _cpuid4_info_regs id4_regs = {};
929
930 for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
931 ret = cpuid4_cache_lookup_regs(idx, &id4_regs);
932 if (ret)
933 return ret;
934 ci_leaf_init(this_leaf++, &id4_regs);
935 __cache_cpumap_setup(cpu, idx, &id4_regs);
936 }
937 this_cpu_ci->cpu_map_populated = true;
938
939 return 0;
940 }
941
942 DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
943 DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)
944