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/init.h>
11 #include <linux/slab.h>
12 #include <linux/device.h>
13 #include <linux/compiler.h>
14 #include <linux/cpu.h>
15 #include <linux/sched.h>
16 #include <linux/pci.h>
17
18 #include <asm/processor.h>
19 #include <linux/smp.h>
20 #include <asm/amd_nb.h>
21 #include <asm/smp.h>
22
23 #define LVL_1_INST 1
24 #define LVL_1_DATA 2
25 #define LVL_2 3
26 #define LVL_3 4
27 #define LVL_TRACE 5
28
29 struct _cache_table {
30 unsigned char descriptor;
31 char cache_type;
32 short size;
33 };
34
35 #define MB(x) ((x) * 1024)
36
37 /* All the cache descriptor types we care about (no TLB or
38 trace cache entries) */
39
40 static const struct _cache_table cache_table[] =
41 {
42 { 0x06, LVL_1_INST, 8 }, /* 4-way set assoc, 32 byte line size */
43 { 0x08, LVL_1_INST, 16 }, /* 4-way set assoc, 32 byte line size */
44 { 0x09, LVL_1_INST, 32 }, /* 4-way set assoc, 64 byte line size */
45 { 0x0a, LVL_1_DATA, 8 }, /* 2 way set assoc, 32 byte line size */
46 { 0x0c, LVL_1_DATA, 16 }, /* 4-way set assoc, 32 byte line size */
47 { 0x0d, LVL_1_DATA, 16 }, /* 4-way set assoc, 64 byte line size */
48 { 0x0e, LVL_1_DATA, 24 }, /* 6-way set assoc, 64 byte line size */
49 { 0x21, LVL_2, 256 }, /* 8-way set assoc, 64 byte line size */
50 { 0x22, LVL_3, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
51 { 0x23, LVL_3, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
52 { 0x25, LVL_3, MB(2) }, /* 8-way set assoc, sectored cache, 64 byte line size */
53 { 0x29, LVL_3, MB(4) }, /* 8-way set assoc, sectored cache, 64 byte line size */
54 { 0x2c, LVL_1_DATA, 32 }, /* 8-way set assoc, 64 byte line size */
55 { 0x30, LVL_1_INST, 32 }, /* 8-way set assoc, 64 byte line size */
56 { 0x39, LVL_2, 128 }, /* 4-way set assoc, sectored cache, 64 byte line size */
57 { 0x3a, LVL_2, 192 }, /* 6-way set assoc, sectored cache, 64 byte line size */
58 { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
59 { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
60 { 0x3d, LVL_2, 384 }, /* 6-way set assoc, sectored cache, 64 byte line size */
61 { 0x3e, LVL_2, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
62 { 0x3f, LVL_2, 256 }, /* 2-way set assoc, 64 byte line size */
63 { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
64 { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
65 { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
66 { 0x44, LVL_2, MB(1) }, /* 4-way set assoc, 32 byte line size */
67 { 0x45, LVL_2, MB(2) }, /* 4-way set assoc, 32 byte line size */
68 { 0x46, LVL_3, MB(4) }, /* 4-way set assoc, 64 byte line size */
69 { 0x47, LVL_3, MB(8) }, /* 8-way set assoc, 64 byte line size */
70 { 0x48, LVL_2, MB(3) }, /* 12-way set assoc, 64 byte line size */
71 { 0x49, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
72 { 0x4a, LVL_3, MB(6) }, /* 12-way set assoc, 64 byte line size */
73 { 0x4b, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
74 { 0x4c, LVL_3, MB(12) }, /* 12-way set assoc, 64 byte line size */
75 { 0x4d, LVL_3, MB(16) }, /* 16-way set assoc, 64 byte line size */
76 { 0x4e, LVL_2, MB(6) }, /* 24-way set assoc, 64 byte line size */
77 { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
78 { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
79 { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
80 { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
81 { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
82 { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
83 { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
84 { 0x73, LVL_TRACE, 64 }, /* 8-way set assoc */
85 { 0x78, LVL_2, MB(1) }, /* 4-way set assoc, 64 byte line size */
86 { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
87 { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
88 { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
89 { 0x7c, LVL_2, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
90 { 0x7d, LVL_2, MB(2) }, /* 8-way set assoc, 64 byte line size */
91 { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
92 { 0x80, LVL_2, 512 }, /* 8-way set assoc, 64 byte line size */
93 { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
94 { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
95 { 0x84, LVL_2, MB(1) }, /* 8-way set assoc, 32 byte line size */
96 { 0x85, LVL_2, MB(2) }, /* 8-way set assoc, 32 byte line size */
97 { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
98 { 0x87, LVL_2, MB(1) }, /* 8-way set assoc, 64 byte line size */
99 { 0xd0, LVL_3, 512 }, /* 4-way set assoc, 64 byte line size */
100 { 0xd1, LVL_3, MB(1) }, /* 4-way set assoc, 64 byte line size */
101 { 0xd2, LVL_3, MB(2) }, /* 4-way set assoc, 64 byte line size */
102 { 0xd6, LVL_3, MB(1) }, /* 8-way set assoc, 64 byte line size */
103 { 0xd7, LVL_3, MB(2) }, /* 8-way set assoc, 64 byte line size */
104 { 0xd8, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
105 { 0xdc, LVL_3, MB(2) }, /* 12-way set assoc, 64 byte line size */
106 { 0xdd, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
107 { 0xde, LVL_3, MB(8) }, /* 12-way set assoc, 64 byte line size */
108 { 0xe2, LVL_3, MB(2) }, /* 16-way set assoc, 64 byte line size */
109 { 0xe3, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
110 { 0xe4, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
111 { 0xea, LVL_3, MB(12) }, /* 24-way set assoc, 64 byte line size */
112 { 0xeb, LVL_3, MB(18) }, /* 24-way set assoc, 64 byte line size */
113 { 0xec, LVL_3, MB(24) }, /* 24-way set assoc, 64 byte line size */
114 { 0x00, 0, 0}
115 };
116
117
118 enum _cache_type {
119 CACHE_TYPE_NULL = 0,
120 CACHE_TYPE_DATA = 1,
121 CACHE_TYPE_INST = 2,
122 CACHE_TYPE_UNIFIED = 3
123 };
124
125 union _cpuid4_leaf_eax {
126 struct {
127 enum _cache_type type:5;
128 unsigned int level:3;
129 unsigned int is_self_initializing:1;
130 unsigned int is_fully_associative:1;
131 unsigned int reserved:4;
132 unsigned int num_threads_sharing:12;
133 unsigned int num_cores_on_die:6;
134 } split;
135 u32 full;
136 };
137
138 union _cpuid4_leaf_ebx {
139 struct {
140 unsigned int coherency_line_size:12;
141 unsigned int physical_line_partition:10;
142 unsigned int ways_of_associativity:10;
143 } split;
144 u32 full;
145 };
146
147 union _cpuid4_leaf_ecx {
148 struct {
149 unsigned int number_of_sets:32;
150 } split;
151 u32 full;
152 };
153
154 struct _cpuid4_info_regs {
155 union _cpuid4_leaf_eax eax;
156 union _cpuid4_leaf_ebx ebx;
157 union _cpuid4_leaf_ecx ecx;
158 unsigned long size;
159 struct amd_northbridge *nb;
160 };
161
162 struct _cpuid4_info {
163 struct _cpuid4_info_regs base;
164 DECLARE_BITMAP(shared_cpu_map, NR_CPUS);
165 };
166
167 unsigned short num_cache_leaves;
168
169 /* AMD doesn't have CPUID4. Emulate it here to report the same
170 information to the user. This makes some assumptions about the machine:
171 L2 not shared, no SMT etc. that is currently true on AMD CPUs.
172
173 In theory the TLBs could be reported as fake type (they are in "dummy").
174 Maybe later */
175 union l1_cache {
176 struct {
177 unsigned line_size:8;
178 unsigned lines_per_tag:8;
179 unsigned assoc:8;
180 unsigned size_in_kb:8;
181 };
182 unsigned val;
183 };
184
185 union l2_cache {
186 struct {
187 unsigned line_size:8;
188 unsigned lines_per_tag:4;
189 unsigned assoc:4;
190 unsigned size_in_kb:16;
191 };
192 unsigned val;
193 };
194
195 union l3_cache {
196 struct {
197 unsigned line_size:8;
198 unsigned lines_per_tag:4;
199 unsigned assoc:4;
200 unsigned res:2;
201 unsigned size_encoded:14;
202 };
203 unsigned val;
204 };
205
206 static const unsigned short assocs[] = {
207 [1] = 1,
208 [2] = 2,
209 [4] = 4,
210 [6] = 8,
211 [8] = 16,
212 [0xa] = 32,
213 [0xb] = 48,
214 [0xc] = 64,
215 [0xd] = 96,
216 [0xe] = 128,
217 [0xf] = 0xffff /* fully associative - no way to show this currently */
218 };
219
220 static const unsigned char levels[] = { 1, 1, 2, 3 };
221 static const unsigned char types[] = { 1, 2, 3, 3 };
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 struct _cache_attr {
295 struct attribute attr;
296 ssize_t (*show)(struct _cpuid4_info *, char *, unsigned int);
297 ssize_t (*store)(struct _cpuid4_info *, const char *, size_t count,
298 unsigned int);
299 };
300
301 #if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
302 /*
303 * L3 cache descriptors
304 */
amd_calc_l3_indices(struct amd_northbridge * nb)305 static void amd_calc_l3_indices(struct amd_northbridge *nb)
306 {
307 struct amd_l3_cache *l3 = &nb->l3_cache;
308 unsigned int sc0, sc1, sc2, sc3;
309 u32 val = 0;
310
311 pci_read_config_dword(nb->misc, 0x1C4, &val);
312
313 /* calculate subcache sizes */
314 l3->subcaches[0] = sc0 = !(val & BIT(0));
315 l3->subcaches[1] = sc1 = !(val & BIT(4));
316
317 if (boot_cpu_data.x86 == 0x15) {
318 l3->subcaches[0] = sc0 += !(val & BIT(1));
319 l3->subcaches[1] = sc1 += !(val & BIT(5));
320 }
321
322 l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
323 l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
324
325 l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
326 }
327
amd_init_l3_cache(struct _cpuid4_info_regs * this_leaf,int index)328 static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
329 {
330 int node;
331
332 /* only for L3, and not in virtualized environments */
333 if (index < 3)
334 return;
335
336 node = amd_get_nb_id(smp_processor_id());
337 this_leaf->nb = node_to_amd_nb(node);
338 if (this_leaf->nb && !this_leaf->nb->l3_cache.indices)
339 amd_calc_l3_indices(this_leaf->nb);
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 */
amd_get_l3_disable_slot(struct amd_northbridge * nb,unsigned slot)349 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
show_cache_disable(struct _cpuid4_info * this_leaf,char * buf,unsigned int slot)362 static ssize_t show_cache_disable(struct _cpuid4_info *this_leaf, char *buf,
363 unsigned int slot)
364 {
365 int index;
366
367 if (!this_leaf->base.nb || !amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
368 return -EINVAL;
369
370 index = amd_get_l3_disable_slot(this_leaf->base.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) \
378 static ssize_t \
379 show_cache_disable_##slot(struct _cpuid4_info *this_leaf, char *buf, \
380 unsigned int cpu) \
381 { \
382 return show_cache_disable(this_leaf, buf, slot); \
383 }
384 SHOW_CACHE_DISABLE(0)
385 SHOW_CACHE_DISABLE(1)
386
amd_l3_disable_index(struct amd_northbridge * nb,int cpu,unsigned slot,unsigned long idx)387 static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
388 unsigned slot, unsigned long idx)
389 {
390 int i;
391
392 idx |= BIT(30);
393
394 /*
395 * disable index in all 4 subcaches
396 */
397 for (i = 0; i < 4; i++) {
398 u32 reg = idx | (i << 20);
399
400 if (!nb->l3_cache.subcaches[i])
401 continue;
402
403 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
404
405 /*
406 * We need to WBINVD on a core on the node containing the L3
407 * cache which indices we disable therefore a simple wbinvd()
408 * is not sufficient.
409 */
410 wbinvd_on_cpu(cpu);
411
412 reg |= BIT(31);
413 pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
414 }
415 }
416
417 /*
418 * disable a L3 cache index by using a disable-slot
419 *
420 * @l3: L3 cache descriptor
421 * @cpu: A CPU on the node containing the L3 cache
422 * @slot: slot number (0..1)
423 * @index: index to disable
424 *
425 * @return: 0 on success, error status on failure
426 */
amd_set_l3_disable_slot(struct amd_northbridge * nb,int cpu,unsigned slot,unsigned long index)427 int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu, unsigned slot,
428 unsigned long index)
429 {
430 int ret = 0;
431
432 /* check if @slot is already used or the index is already disabled */
433 ret = amd_get_l3_disable_slot(nb, slot);
434 if (ret >= 0)
435 return -EEXIST;
436
437 if (index > nb->l3_cache.indices)
438 return -EINVAL;
439
440 /* check whether the other slot has disabled the same index already */
441 if (index == amd_get_l3_disable_slot(nb, !slot))
442 return -EEXIST;
443
444 amd_l3_disable_index(nb, cpu, slot, index);
445
446 return 0;
447 }
448
store_cache_disable(struct _cpuid4_info * this_leaf,const char * buf,size_t count,unsigned int slot)449 static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
450 const char *buf, size_t count,
451 unsigned int slot)
452 {
453 unsigned long val = 0;
454 int cpu, err = 0;
455
456 if (!capable(CAP_SYS_ADMIN))
457 return -EPERM;
458
459 if (!this_leaf->base.nb || !amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
460 return -EINVAL;
461
462 cpu = cpumask_first(to_cpumask(this_leaf->shared_cpu_map));
463
464 if (kstrtoul(buf, 10, &val) < 0)
465 return -EINVAL;
466
467 err = amd_set_l3_disable_slot(this_leaf->base.nb, cpu, slot, val);
468 if (err) {
469 if (err == -EEXIST)
470 pr_warning("L3 slot %d in use/index already disabled!\n",
471 slot);
472 return err;
473 }
474 return count;
475 }
476
477 #define STORE_CACHE_DISABLE(slot) \
478 static ssize_t \
479 store_cache_disable_##slot(struct _cpuid4_info *this_leaf, \
480 const char *buf, size_t count, \
481 unsigned int cpu) \
482 { \
483 return store_cache_disable(this_leaf, buf, count, slot); \
484 }
485 STORE_CACHE_DISABLE(0)
486 STORE_CACHE_DISABLE(1)
487
488 static struct _cache_attr cache_disable_0 = __ATTR(cache_disable_0, 0644,
489 show_cache_disable_0, store_cache_disable_0);
490 static struct _cache_attr cache_disable_1 = __ATTR(cache_disable_1, 0644,
491 show_cache_disable_1, store_cache_disable_1);
492
493 static ssize_t
show_subcaches(struct _cpuid4_info * this_leaf,char * buf,unsigned int cpu)494 show_subcaches(struct _cpuid4_info *this_leaf, char *buf, unsigned int cpu)
495 {
496 if (!this_leaf->base.nb || !amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
497 return -EINVAL;
498
499 return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
500 }
501
502 static ssize_t
store_subcaches(struct _cpuid4_info * this_leaf,const char * buf,size_t count,unsigned int cpu)503 store_subcaches(struct _cpuid4_info *this_leaf, const char *buf, size_t count,
504 unsigned int cpu)
505 {
506 unsigned long val;
507
508 if (!capable(CAP_SYS_ADMIN))
509 return -EPERM;
510
511 if (!this_leaf->base.nb || !amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
512 return -EINVAL;
513
514 if (kstrtoul(buf, 16, &val) < 0)
515 return -EINVAL;
516
517 if (amd_set_subcaches(cpu, val))
518 return -EINVAL;
519
520 return count;
521 }
522
523 static struct _cache_attr subcaches =
524 __ATTR(subcaches, 0644, show_subcaches, store_subcaches);
525
526 #else
527 #define amd_init_l3_cache(x, y)
528 #endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
529
530 static int
cpuid4_cache_lookup_regs(int index,struct _cpuid4_info_regs * this_leaf)531 cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
532 {
533 union _cpuid4_leaf_eax eax;
534 union _cpuid4_leaf_ebx ebx;
535 union _cpuid4_leaf_ecx ecx;
536 unsigned edx;
537
538 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
539 if (cpu_has_topoext)
540 cpuid_count(0x8000001d, index, &eax.full,
541 &ebx.full, &ecx.full, &edx);
542 else
543 amd_cpuid4(index, &eax, &ebx, &ecx);
544 amd_init_l3_cache(this_leaf, index);
545 } else {
546 cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
547 }
548
549 if (eax.split.type == CACHE_TYPE_NULL)
550 return -EIO; /* better error ? */
551
552 this_leaf->eax = eax;
553 this_leaf->ebx = ebx;
554 this_leaf->ecx = ecx;
555 this_leaf->size = (ecx.split.number_of_sets + 1) *
556 (ebx.split.coherency_line_size + 1) *
557 (ebx.split.physical_line_partition + 1) *
558 (ebx.split.ways_of_associativity + 1);
559 return 0;
560 }
561
find_num_cache_leaves(struct cpuinfo_x86 * c)562 static int find_num_cache_leaves(struct cpuinfo_x86 *c)
563 {
564 unsigned int eax, ebx, ecx, edx, op;
565 union _cpuid4_leaf_eax cache_eax;
566 int i = -1;
567
568 if (c->x86_vendor == X86_VENDOR_AMD)
569 op = 0x8000001d;
570 else
571 op = 4;
572
573 do {
574 ++i;
575 /* Do cpuid(op) loop to find out num_cache_leaves */
576 cpuid_count(op, i, &eax, &ebx, &ecx, &edx);
577 cache_eax.full = eax;
578 } while (cache_eax.split.type != CACHE_TYPE_NULL);
579 return i;
580 }
581
init_amd_cacheinfo(struct cpuinfo_x86 * c)582 void init_amd_cacheinfo(struct cpuinfo_x86 *c)
583 {
584
585 if (cpu_has_topoext) {
586 num_cache_leaves = find_num_cache_leaves(c);
587 } else if (c->extended_cpuid_level >= 0x80000006) {
588 if (cpuid_edx(0x80000006) & 0xf000)
589 num_cache_leaves = 4;
590 else
591 num_cache_leaves = 3;
592 }
593 }
594
init_intel_cacheinfo(struct cpuinfo_x86 * c)595 unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c)
596 {
597 /* Cache sizes */
598 unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0;
599 unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
600 unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
601 unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
602 #ifdef CONFIG_X86_HT
603 unsigned int cpu = c->cpu_index;
604 #endif
605
606 if (c->cpuid_level > 3) {
607 static int is_initialized;
608
609 if (is_initialized == 0) {
610 /* Init num_cache_leaves from boot CPU */
611 num_cache_leaves = find_num_cache_leaves(c);
612 is_initialized++;
613 }
614
615 /*
616 * Whenever possible use cpuid(4), deterministic cache
617 * parameters cpuid leaf to find the cache details
618 */
619 for (i = 0; i < num_cache_leaves; i++) {
620 struct _cpuid4_info_regs this_leaf = {};
621 int retval;
622
623 retval = cpuid4_cache_lookup_regs(i, &this_leaf);
624 if (retval < 0)
625 continue;
626
627 switch (this_leaf.eax.split.level) {
628 case 1:
629 if (this_leaf.eax.split.type == CACHE_TYPE_DATA)
630 new_l1d = this_leaf.size/1024;
631 else if (this_leaf.eax.split.type == CACHE_TYPE_INST)
632 new_l1i = this_leaf.size/1024;
633 break;
634 case 2:
635 new_l2 = this_leaf.size/1024;
636 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
637 index_msb = get_count_order(num_threads_sharing);
638 l2_id = c->apicid & ~((1 << index_msb) - 1);
639 break;
640 case 3:
641 new_l3 = this_leaf.size/1024;
642 num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
643 index_msb = get_count_order(num_threads_sharing);
644 l3_id = c->apicid & ~((1 << index_msb) - 1);
645 break;
646 default:
647 break;
648 }
649 }
650 }
651 /*
652 * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
653 * trace cache
654 */
655 if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
656 /* supports eax=2 call */
657 int j, n;
658 unsigned int regs[4];
659 unsigned char *dp = (unsigned char *)regs;
660 int only_trace = 0;
661
662 if (num_cache_leaves != 0 && c->x86 == 15)
663 only_trace = 1;
664
665 /* Number of times to iterate */
666 n = cpuid_eax(2) & 0xFF;
667
668 for (i = 0 ; i < n ; i++) {
669 cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]);
670
671 /* If bit 31 is set, this is an unknown format */
672 for (j = 0 ; j < 3 ; j++)
673 if (regs[j] & (1 << 31))
674 regs[j] = 0;
675
676 /* Byte 0 is level count, not a descriptor */
677 for (j = 1 ; j < 16 ; j++) {
678 unsigned char des = dp[j];
679 unsigned char k = 0;
680
681 /* look up this descriptor in the table */
682 while (cache_table[k].descriptor != 0) {
683 if (cache_table[k].descriptor == des) {
684 if (only_trace && cache_table[k].cache_type != LVL_TRACE)
685 break;
686 switch (cache_table[k].cache_type) {
687 case LVL_1_INST:
688 l1i += cache_table[k].size;
689 break;
690 case LVL_1_DATA:
691 l1d += cache_table[k].size;
692 break;
693 case LVL_2:
694 l2 += cache_table[k].size;
695 break;
696 case LVL_3:
697 l3 += cache_table[k].size;
698 break;
699 case LVL_TRACE:
700 trace += cache_table[k].size;
701 break;
702 }
703
704 break;
705 }
706
707 k++;
708 }
709 }
710 }
711 }
712
713 if (new_l1d)
714 l1d = new_l1d;
715
716 if (new_l1i)
717 l1i = new_l1i;
718
719 if (new_l2) {
720 l2 = new_l2;
721 #ifdef CONFIG_X86_HT
722 per_cpu(cpu_llc_id, cpu) = l2_id;
723 #endif
724 }
725
726 if (new_l3) {
727 l3 = new_l3;
728 #ifdef CONFIG_X86_HT
729 per_cpu(cpu_llc_id, cpu) = l3_id;
730 #endif
731 }
732
733 #ifdef CONFIG_X86_HT
734 /*
735 * If cpu_llc_id is not yet set, this means cpuid_level < 4 which in
736 * turns means that the only possibility is SMT (as indicated in
737 * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
738 * that SMT shares all caches, we can unconditionally set cpu_llc_id to
739 * c->phys_proc_id.
740 */
741 if (per_cpu(cpu_llc_id, cpu) == BAD_APICID)
742 per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
743 #endif
744
745 c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
746
747 return l2;
748 }
749
750 #ifdef CONFIG_SYSFS
751
752 /* pointer to _cpuid4_info array (for each cache leaf) */
753 static DEFINE_PER_CPU(struct _cpuid4_info *, ici_cpuid4_info);
754 #define CPUID4_INFO_IDX(x, y) (&((per_cpu(ici_cpuid4_info, x))[y]))
755
756 #ifdef CONFIG_SMP
757
cache_shared_amd_cpu_map_setup(unsigned int cpu,int index)758 static int cache_shared_amd_cpu_map_setup(unsigned int cpu, int index)
759 {
760 struct _cpuid4_info *this_leaf;
761 int i, sibling;
762
763 if (cpu_has_topoext) {
764 unsigned int apicid, nshared, first, last;
765
766 if (!per_cpu(ici_cpuid4_info, cpu))
767 return 0;
768
769 this_leaf = CPUID4_INFO_IDX(cpu, index);
770 nshared = this_leaf->base.eax.split.num_threads_sharing + 1;
771 apicid = cpu_data(cpu).apicid;
772 first = apicid - (apicid % nshared);
773 last = first + nshared - 1;
774
775 for_each_online_cpu(i) {
776 apicid = cpu_data(i).apicid;
777 if ((apicid < first) || (apicid > last))
778 continue;
779 if (!per_cpu(ici_cpuid4_info, i))
780 continue;
781 this_leaf = CPUID4_INFO_IDX(i, index);
782
783 for_each_online_cpu(sibling) {
784 apicid = cpu_data(sibling).apicid;
785 if ((apicid < first) || (apicid > last))
786 continue;
787 set_bit(sibling, this_leaf->shared_cpu_map);
788 }
789 }
790 } else if (index == 3) {
791 for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
792 if (!per_cpu(ici_cpuid4_info, i))
793 continue;
794 this_leaf = CPUID4_INFO_IDX(i, index);
795 for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
796 if (!cpu_online(sibling))
797 continue;
798 set_bit(sibling, this_leaf->shared_cpu_map);
799 }
800 }
801 } else
802 return 0;
803
804 return 1;
805 }
806
cache_shared_cpu_map_setup(unsigned int cpu,int index)807 static void cache_shared_cpu_map_setup(unsigned int cpu, int index)
808 {
809 struct _cpuid4_info *this_leaf, *sibling_leaf;
810 unsigned long num_threads_sharing;
811 int index_msb, i;
812 struct cpuinfo_x86 *c = &cpu_data(cpu);
813
814 if (c->x86_vendor == X86_VENDOR_AMD) {
815 if (cache_shared_amd_cpu_map_setup(cpu, index))
816 return;
817 }
818
819 this_leaf = CPUID4_INFO_IDX(cpu, index);
820 num_threads_sharing = 1 + this_leaf->base.eax.split.num_threads_sharing;
821
822 if (num_threads_sharing == 1)
823 cpumask_set_cpu(cpu, to_cpumask(this_leaf->shared_cpu_map));
824 else {
825 index_msb = get_count_order(num_threads_sharing);
826
827 for_each_online_cpu(i) {
828 if (cpu_data(i).apicid >> index_msb ==
829 c->apicid >> index_msb) {
830 cpumask_set_cpu(i,
831 to_cpumask(this_leaf->shared_cpu_map));
832 if (i != cpu && per_cpu(ici_cpuid4_info, i)) {
833 sibling_leaf =
834 CPUID4_INFO_IDX(i, index);
835 cpumask_set_cpu(cpu, to_cpumask(
836 sibling_leaf->shared_cpu_map));
837 }
838 }
839 }
840 }
841 }
cache_remove_shared_cpu_map(unsigned int cpu,int index)842 static void cache_remove_shared_cpu_map(unsigned int cpu, int index)
843 {
844 struct _cpuid4_info *this_leaf, *sibling_leaf;
845 int sibling;
846
847 this_leaf = CPUID4_INFO_IDX(cpu, index);
848 for_each_cpu(sibling, to_cpumask(this_leaf->shared_cpu_map)) {
849 sibling_leaf = CPUID4_INFO_IDX(sibling, index);
850 cpumask_clear_cpu(cpu,
851 to_cpumask(sibling_leaf->shared_cpu_map));
852 }
853 }
854 #else
cache_shared_cpu_map_setup(unsigned int cpu,int index)855 static void cache_shared_cpu_map_setup(unsigned int cpu, int index)
856 {
857 }
858
cache_remove_shared_cpu_map(unsigned int cpu,int index)859 static void cache_remove_shared_cpu_map(unsigned int cpu, int index)
860 {
861 }
862 #endif
863
free_cache_attributes(unsigned int cpu)864 static void free_cache_attributes(unsigned int cpu)
865 {
866 int i;
867
868 for (i = 0; i < num_cache_leaves; i++)
869 cache_remove_shared_cpu_map(cpu, i);
870
871 kfree(per_cpu(ici_cpuid4_info, cpu));
872 per_cpu(ici_cpuid4_info, cpu) = NULL;
873 }
874
get_cpu_leaves(void * _retval)875 static void get_cpu_leaves(void *_retval)
876 {
877 int j, *retval = _retval, cpu = smp_processor_id();
878
879 /* Do cpuid and store the results */
880 for (j = 0; j < num_cache_leaves; j++) {
881 struct _cpuid4_info *this_leaf = CPUID4_INFO_IDX(cpu, j);
882
883 *retval = cpuid4_cache_lookup_regs(j, &this_leaf->base);
884 if (unlikely(*retval < 0)) {
885 int i;
886
887 for (i = 0; i < j; i++)
888 cache_remove_shared_cpu_map(cpu, i);
889 break;
890 }
891 cache_shared_cpu_map_setup(cpu, j);
892 }
893 }
894
detect_cache_attributes(unsigned int cpu)895 static int detect_cache_attributes(unsigned int cpu)
896 {
897 int retval;
898
899 if (num_cache_leaves == 0)
900 return -ENOENT;
901
902 per_cpu(ici_cpuid4_info, cpu) = kzalloc(
903 sizeof(struct _cpuid4_info) * num_cache_leaves, GFP_KERNEL);
904 if (per_cpu(ici_cpuid4_info, cpu) == NULL)
905 return -ENOMEM;
906
907 smp_call_function_single(cpu, get_cpu_leaves, &retval, true);
908 if (retval) {
909 kfree(per_cpu(ici_cpuid4_info, cpu));
910 per_cpu(ici_cpuid4_info, cpu) = NULL;
911 }
912
913 return retval;
914 }
915
916 #include <linux/kobject.h>
917 #include <linux/sysfs.h>
918 #include <linux/cpu.h>
919
920 /* pointer to kobject for cpuX/cache */
921 static DEFINE_PER_CPU(struct kobject *, ici_cache_kobject);
922
923 struct _index_kobject {
924 struct kobject kobj;
925 unsigned int cpu;
926 unsigned short index;
927 };
928
929 /* pointer to array of kobjects for cpuX/cache/indexY */
930 static DEFINE_PER_CPU(struct _index_kobject *, ici_index_kobject);
931 #define INDEX_KOBJECT_PTR(x, y) (&((per_cpu(ici_index_kobject, x))[y]))
932
933 #define show_one_plus(file_name, object, val) \
934 static ssize_t show_##file_name(struct _cpuid4_info *this_leaf, char *buf, \
935 unsigned int cpu) \
936 { \
937 return sprintf(buf, "%lu\n", (unsigned long)this_leaf->object + val); \
938 }
939
940 show_one_plus(level, base.eax.split.level, 0);
941 show_one_plus(coherency_line_size, base.ebx.split.coherency_line_size, 1);
942 show_one_plus(physical_line_partition, base.ebx.split.physical_line_partition, 1);
943 show_one_plus(ways_of_associativity, base.ebx.split.ways_of_associativity, 1);
944 show_one_plus(number_of_sets, base.ecx.split.number_of_sets, 1);
945
show_size(struct _cpuid4_info * this_leaf,char * buf,unsigned int cpu)946 static ssize_t show_size(struct _cpuid4_info *this_leaf, char *buf,
947 unsigned int cpu)
948 {
949 return sprintf(buf, "%luK\n", this_leaf->base.size / 1024);
950 }
951
show_shared_cpu_map_func(struct _cpuid4_info * this_leaf,int type,char * buf)952 static ssize_t show_shared_cpu_map_func(struct _cpuid4_info *this_leaf,
953 int type, char *buf)
954 {
955 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
956 int n = 0;
957
958 if (len > 1) {
959 const struct cpumask *mask;
960
961 mask = to_cpumask(this_leaf->shared_cpu_map);
962 n = type ?
963 cpulist_scnprintf(buf, len-2, mask) :
964 cpumask_scnprintf(buf, len-2, mask);
965 buf[n++] = '\n';
966 buf[n] = '\0';
967 }
968 return n;
969 }
970
show_shared_cpu_map(struct _cpuid4_info * leaf,char * buf,unsigned int cpu)971 static inline ssize_t show_shared_cpu_map(struct _cpuid4_info *leaf, char *buf,
972 unsigned int cpu)
973 {
974 return show_shared_cpu_map_func(leaf, 0, buf);
975 }
976
show_shared_cpu_list(struct _cpuid4_info * leaf,char * buf,unsigned int cpu)977 static inline ssize_t show_shared_cpu_list(struct _cpuid4_info *leaf, char *buf,
978 unsigned int cpu)
979 {
980 return show_shared_cpu_map_func(leaf, 1, buf);
981 }
982
show_type(struct _cpuid4_info * this_leaf,char * buf,unsigned int cpu)983 static ssize_t show_type(struct _cpuid4_info *this_leaf, char *buf,
984 unsigned int cpu)
985 {
986 switch (this_leaf->base.eax.split.type) {
987 case CACHE_TYPE_DATA:
988 return sprintf(buf, "Data\n");
989 case CACHE_TYPE_INST:
990 return sprintf(buf, "Instruction\n");
991 case CACHE_TYPE_UNIFIED:
992 return sprintf(buf, "Unified\n");
993 default:
994 return sprintf(buf, "Unknown\n");
995 }
996 }
997
998 #define to_object(k) container_of(k, struct _index_kobject, kobj)
999 #define to_attr(a) container_of(a, struct _cache_attr, attr)
1000
1001 #define define_one_ro(_name) \
1002 static struct _cache_attr _name = \
1003 __ATTR(_name, 0444, show_##_name, NULL)
1004
1005 define_one_ro(level);
1006 define_one_ro(type);
1007 define_one_ro(coherency_line_size);
1008 define_one_ro(physical_line_partition);
1009 define_one_ro(ways_of_associativity);
1010 define_one_ro(number_of_sets);
1011 define_one_ro(size);
1012 define_one_ro(shared_cpu_map);
1013 define_one_ro(shared_cpu_list);
1014
1015 static struct attribute *default_attrs[] = {
1016 &type.attr,
1017 &level.attr,
1018 &coherency_line_size.attr,
1019 &physical_line_partition.attr,
1020 &ways_of_associativity.attr,
1021 &number_of_sets.attr,
1022 &size.attr,
1023 &shared_cpu_map.attr,
1024 &shared_cpu_list.attr,
1025 NULL
1026 };
1027
1028 #ifdef CONFIG_AMD_NB
amd_l3_attrs(void)1029 static struct attribute **amd_l3_attrs(void)
1030 {
1031 static struct attribute **attrs;
1032 int n;
1033
1034 if (attrs)
1035 return attrs;
1036
1037 n = ARRAY_SIZE(default_attrs);
1038
1039 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
1040 n += 2;
1041
1042 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
1043 n += 1;
1044
1045 attrs = kzalloc(n * sizeof (struct attribute *), GFP_KERNEL);
1046 if (attrs == NULL)
1047 return attrs = default_attrs;
1048
1049 for (n = 0; default_attrs[n]; n++)
1050 attrs[n] = default_attrs[n];
1051
1052 if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE)) {
1053 attrs[n++] = &cache_disable_0.attr;
1054 attrs[n++] = &cache_disable_1.attr;
1055 }
1056
1057 if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
1058 attrs[n++] = &subcaches.attr;
1059
1060 return attrs;
1061 }
1062 #endif
1063
show(struct kobject * kobj,struct attribute * attr,char * buf)1064 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
1065 {
1066 struct _cache_attr *fattr = to_attr(attr);
1067 struct _index_kobject *this_leaf = to_object(kobj);
1068 ssize_t ret;
1069
1070 ret = fattr->show ?
1071 fattr->show(CPUID4_INFO_IDX(this_leaf->cpu, this_leaf->index),
1072 buf, this_leaf->cpu) :
1073 0;
1074 return ret;
1075 }
1076
store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)1077 static ssize_t store(struct kobject *kobj, struct attribute *attr,
1078 const char *buf, size_t count)
1079 {
1080 struct _cache_attr *fattr = to_attr(attr);
1081 struct _index_kobject *this_leaf = to_object(kobj);
1082 ssize_t ret;
1083
1084 ret = fattr->store ?
1085 fattr->store(CPUID4_INFO_IDX(this_leaf->cpu, this_leaf->index),
1086 buf, count, this_leaf->cpu) :
1087 0;
1088 return ret;
1089 }
1090
1091 static const struct sysfs_ops sysfs_ops = {
1092 .show = show,
1093 .store = store,
1094 };
1095
1096 static struct kobj_type ktype_cache = {
1097 .sysfs_ops = &sysfs_ops,
1098 .default_attrs = default_attrs,
1099 };
1100
1101 static struct kobj_type ktype_percpu_entry = {
1102 .sysfs_ops = &sysfs_ops,
1103 };
1104
cpuid4_cache_sysfs_exit(unsigned int cpu)1105 static void cpuid4_cache_sysfs_exit(unsigned int cpu)
1106 {
1107 kfree(per_cpu(ici_cache_kobject, cpu));
1108 kfree(per_cpu(ici_index_kobject, cpu));
1109 per_cpu(ici_cache_kobject, cpu) = NULL;
1110 per_cpu(ici_index_kobject, cpu) = NULL;
1111 free_cache_attributes(cpu);
1112 }
1113
cpuid4_cache_sysfs_init(unsigned int cpu)1114 static int cpuid4_cache_sysfs_init(unsigned int cpu)
1115 {
1116 int err;
1117
1118 if (num_cache_leaves == 0)
1119 return -ENOENT;
1120
1121 err = detect_cache_attributes(cpu);
1122 if (err)
1123 return err;
1124
1125 /* Allocate all required memory */
1126 per_cpu(ici_cache_kobject, cpu) =
1127 kzalloc(sizeof(struct kobject), GFP_KERNEL);
1128 if (unlikely(per_cpu(ici_cache_kobject, cpu) == NULL))
1129 goto err_out;
1130
1131 per_cpu(ici_index_kobject, cpu) = kzalloc(
1132 sizeof(struct _index_kobject) * num_cache_leaves, GFP_KERNEL);
1133 if (unlikely(per_cpu(ici_index_kobject, cpu) == NULL))
1134 goto err_out;
1135
1136 return 0;
1137
1138 err_out:
1139 cpuid4_cache_sysfs_exit(cpu);
1140 return -ENOMEM;
1141 }
1142
1143 static DECLARE_BITMAP(cache_dev_map, NR_CPUS);
1144
1145 /* Add/Remove cache interface for CPU device */
cache_add_dev(struct device * dev)1146 static int cache_add_dev(struct device *dev)
1147 {
1148 unsigned int cpu = dev->id;
1149 unsigned long i, j;
1150 struct _index_kobject *this_object;
1151 struct _cpuid4_info *this_leaf;
1152 int retval;
1153
1154 retval = cpuid4_cache_sysfs_init(cpu);
1155 if (unlikely(retval < 0))
1156 return retval;
1157
1158 retval = kobject_init_and_add(per_cpu(ici_cache_kobject, cpu),
1159 &ktype_percpu_entry,
1160 &dev->kobj, "%s", "cache");
1161 if (retval < 0) {
1162 cpuid4_cache_sysfs_exit(cpu);
1163 return retval;
1164 }
1165
1166 for (i = 0; i < num_cache_leaves; i++) {
1167 this_object = INDEX_KOBJECT_PTR(cpu, i);
1168 this_object->cpu = cpu;
1169 this_object->index = i;
1170
1171 this_leaf = CPUID4_INFO_IDX(cpu, i);
1172
1173 ktype_cache.default_attrs = default_attrs;
1174 #ifdef CONFIG_AMD_NB
1175 if (this_leaf->base.nb)
1176 ktype_cache.default_attrs = amd_l3_attrs();
1177 #endif
1178 retval = kobject_init_and_add(&(this_object->kobj),
1179 &ktype_cache,
1180 per_cpu(ici_cache_kobject, cpu),
1181 "index%1lu", i);
1182 if (unlikely(retval)) {
1183 for (j = 0; j < i; j++)
1184 kobject_put(&(INDEX_KOBJECT_PTR(cpu, j)->kobj));
1185 kobject_put(per_cpu(ici_cache_kobject, cpu));
1186 cpuid4_cache_sysfs_exit(cpu);
1187 return retval;
1188 }
1189 kobject_uevent(&(this_object->kobj), KOBJ_ADD);
1190 }
1191 cpumask_set_cpu(cpu, to_cpumask(cache_dev_map));
1192
1193 kobject_uevent(per_cpu(ici_cache_kobject, cpu), KOBJ_ADD);
1194 return 0;
1195 }
1196
cache_remove_dev(struct device * dev)1197 static void cache_remove_dev(struct device *dev)
1198 {
1199 unsigned int cpu = dev->id;
1200 unsigned long i;
1201
1202 if (per_cpu(ici_cpuid4_info, cpu) == NULL)
1203 return;
1204 if (!cpumask_test_cpu(cpu, to_cpumask(cache_dev_map)))
1205 return;
1206 cpumask_clear_cpu(cpu, to_cpumask(cache_dev_map));
1207
1208 for (i = 0; i < num_cache_leaves; i++)
1209 kobject_put(&(INDEX_KOBJECT_PTR(cpu, i)->kobj));
1210 kobject_put(per_cpu(ici_cache_kobject, cpu));
1211 cpuid4_cache_sysfs_exit(cpu);
1212 }
1213
cacheinfo_cpu_callback(struct notifier_block * nfb,unsigned long action,void * hcpu)1214 static int cacheinfo_cpu_callback(struct notifier_block *nfb,
1215 unsigned long action, void *hcpu)
1216 {
1217 unsigned int cpu = (unsigned long)hcpu;
1218 struct device *dev;
1219
1220 dev = get_cpu_device(cpu);
1221 switch (action) {
1222 case CPU_ONLINE:
1223 case CPU_ONLINE_FROZEN:
1224 cache_add_dev(dev);
1225 break;
1226 case CPU_DEAD:
1227 case CPU_DEAD_FROZEN:
1228 cache_remove_dev(dev);
1229 break;
1230 }
1231 return NOTIFY_OK;
1232 }
1233
1234 static struct notifier_block cacheinfo_cpu_notifier = {
1235 .notifier_call = cacheinfo_cpu_callback,
1236 };
1237
cache_sysfs_init(void)1238 static int __init cache_sysfs_init(void)
1239 {
1240 int i, err = 0;
1241
1242 if (num_cache_leaves == 0)
1243 return 0;
1244
1245 cpu_notifier_register_begin();
1246 for_each_online_cpu(i) {
1247 struct device *dev = get_cpu_device(i);
1248
1249 err = cache_add_dev(dev);
1250 if (err)
1251 goto out;
1252 }
1253 __register_hotcpu_notifier(&cacheinfo_cpu_notifier);
1254
1255 out:
1256 cpu_notifier_register_done();
1257 return err;
1258 }
1259
1260 device_initcall(cache_sysfs_init);
1261
1262 #endif
1263