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WIP FPC-III support
[linux/fpc-iii.git] / arch / x86 / events / amd / uncore.c
blob7f014d450bc28caf08be42129f74d595b1ac1ef6
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2013 Advanced Micro Devices, Inc.
4 *
5 * Author: Jacob Shin <jacob.shin@amd.com>
6 */
7
8 #include <linux/perf_event.h>
9 #include <linux/percpu.h>
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/init.h>
13 #include <linux/cpu.h>
14 #include <linux/cpumask.h>
15
16 #include <asm/cpufeature.h>
17 #include <asm/perf_event.h>
18 #include <asm/msr.h>
19 #include <asm/smp.h>
20
21 #define NUM_COUNTERS_NB 4
22 #define NUM_COUNTERS_L2 4
23 #define NUM_COUNTERS_L3 6
24 #define MAX_COUNTERS 6
25
26 #define RDPMC_BASE_NB 6
27 #define RDPMC_BASE_LLC 10
28
29 #define COUNTER_SHIFT 16
30
31 #undef pr_fmt
32 #define pr_fmt(fmt) "amd_uncore: " fmt
33
34 static int num_counters_llc;
35 static int num_counters_nb;
36 static bool l3_mask;
37
38 static HLIST_HEAD(uncore_unused_list);
39
40 struct amd_uncore {
41 int id;
42 int refcnt;
43 int cpu;
44 int num_counters;
45 int rdpmc_base;
46 u32 msr_base;
47 cpumask_t *active_mask;
48 struct pmu *pmu;
49 struct perf_event *events[MAX_COUNTERS];
50 struct hlist_node node;
51 };
52
53 static struct amd_uncore * __percpu *amd_uncore_nb;
54 static struct amd_uncore * __percpu *amd_uncore_llc;
55
56 static struct pmu amd_nb_pmu;
57 static struct pmu amd_llc_pmu;
58
59 static cpumask_t amd_nb_active_mask;
60 static cpumask_t amd_llc_active_mask;
61
62 static bool is_nb_event(struct perf_event *event)
63 {
64 return event->pmu->type == amd_nb_pmu.type;
65 }
66
67 static bool is_llc_event(struct perf_event *event)
68 {
69 return event->pmu->type == amd_llc_pmu.type;
70 }
71
72 static struct amd_uncore *event_to_amd_uncore(struct perf_event *event)
73 {
74 if (is_nb_event(event) && amd_uncore_nb)
75 return *per_cpu_ptr(amd_uncore_nb, event->cpu);
76 else if (is_llc_event(event) && amd_uncore_llc)
77 return *per_cpu_ptr(amd_uncore_llc, event->cpu);
78
79 return NULL;
80 }
81
82 static void amd_uncore_read(struct perf_event *event)
83 {
84 struct hw_perf_event *hwc = &event->hw;
85 u64 prev, new;
86 s64 delta;
87
88 /*
89 * since we do not enable counter overflow interrupts,
90 * we do not have to worry about prev_count changing on us
91 */
92
93 prev = local64_read(&hwc->prev_count);
94 rdpmcl(hwc->event_base_rdpmc, new);
95 local64_set(&hwc->prev_count, new);
96 delta = (new << COUNTER_SHIFT) - (prev << COUNTER_SHIFT);
97 delta >>= COUNTER_SHIFT;
98 local64_add(delta, &event->count);
99 }
100
101 static void amd_uncore_start(struct perf_event *event, int flags)
102 {
103 struct hw_perf_event *hwc = &event->hw;
104
105 if (flags & PERF_EF_RELOAD)
106 wrmsrl(hwc->event_base, (u64)local64_read(&hwc->prev_count));
107
108 hwc->state = 0;
109 wrmsrl(hwc->config_base, (hwc->config | ARCH_PERFMON_EVENTSEL_ENABLE));
110 perf_event_update_userpage(event);
111 }
112
113 static void amd_uncore_stop(struct perf_event *event, int flags)
114 {
115 struct hw_perf_event *hwc = &event->hw;
116
117 wrmsrl(hwc->config_base, hwc->config);
118 hwc->state |= PERF_HES_STOPPED;
119
120 if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
121 amd_uncore_read(event);
122 hwc->state |= PERF_HES_UPTODATE;
123 }
124 }
125
126 static int amd_uncore_add(struct perf_event *event, int flags)
127 {
128 int i;
129 struct amd_uncore *uncore = event_to_amd_uncore(event);
130 struct hw_perf_event *hwc = &event->hw;
131
132 /* are we already assigned? */
133 if (hwc->idx != -1 && uncore->events[hwc->idx] == event)
134 goto out;
135
136 for (i = 0; i < uncore->num_counters; i++) {
137 if (uncore->events[i] == event) {
138 hwc->idx = i;
139 goto out;
140 }
141 }
142
143 /* if not, take the first available counter */
144 hwc->idx = -1;
145 for (i = 0; i < uncore->num_counters; i++) {
146 if (cmpxchg(&uncore->events[i], NULL, event) == NULL) {
147 hwc->idx = i;
148 break;
149 }
150 }
151
152 out:
153 if (hwc->idx == -1)
154 return -EBUSY;
155
156 hwc->config_base = uncore->msr_base + (2 * hwc->idx);
157 hwc->event_base = uncore->msr_base + 1 + (2 * hwc->idx);
158 hwc->event_base_rdpmc = uncore->rdpmc_base + hwc->idx;
159 hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
160
161 if (flags & PERF_EF_START)
162 amd_uncore_start(event, PERF_EF_RELOAD);
163
164 return 0;
165 }
166
167 static void amd_uncore_del(struct perf_event *event, int flags)
168 {
169 int i;
170 struct amd_uncore *uncore = event_to_amd_uncore(event);
171 struct hw_perf_event *hwc = &event->hw;
172
173 amd_uncore_stop(event, PERF_EF_UPDATE);
174
175 for (i = 0; i < uncore->num_counters; i++) {
176 if (cmpxchg(&uncore->events[i], event, NULL) == event)
177 break;
178 }
179
180 hwc->idx = -1;
181 }
182
183 /*
184 * Return a full thread and slice mask unless user
185 * has provided them
186 */
187 static u64 l3_thread_slice_mask(u64 config)
188 {
189 if (boot_cpu_data.x86 <= 0x18)
190 return ((config & AMD64_L3_SLICE_MASK) ? : AMD64_L3_SLICE_MASK) |
191 ((config & AMD64_L3_THREAD_MASK) ? : AMD64_L3_THREAD_MASK);
192
193 /*
194 * If the user doesn't specify a threadmask, they're not trying to
195 * count core 0, so we enable all cores & threads.
196 * We'll also assume that they want to count slice 0 if they specify
197 * a threadmask and leave sliceid and enallslices unpopulated.
198 */
199 if (!(config & AMD64_L3_F19H_THREAD_MASK))
200 return AMD64_L3_F19H_THREAD_MASK | AMD64_L3_EN_ALL_SLICES |
201 AMD64_L3_EN_ALL_CORES;
202
203 return config & (AMD64_L3_F19H_THREAD_MASK | AMD64_L3_SLICEID_MASK |
204 AMD64_L3_EN_ALL_CORES | AMD64_L3_EN_ALL_SLICES |
205 AMD64_L3_COREID_MASK);
206 }
207
208 static int amd_uncore_event_init(struct perf_event *event)
209 {
210 struct amd_uncore *uncore;
211 struct hw_perf_event *hwc = &event->hw;
212
213 if (event->attr.type != event->pmu->type)
214 return -ENOENT;
215
216 /*
217 * NB and Last level cache counters (MSRs) are shared across all cores
218 * that share the same NB / Last level cache. On family 16h and below,
219 * Interrupts can be directed to a single target core, however, event
220 * counts generated by processes running on other cores cannot be masked
221 * out. So we do not support sampling and per-thread events via
222 * CAP_NO_INTERRUPT, and we do not enable counter overflow interrupts:
223 */
224 hwc->config = event->attr.config & AMD64_RAW_EVENT_MASK_NB;
225 hwc->idx = -1;
226
227 if (event->cpu < 0)
228 return -EINVAL;
229
230 /*
231 * SliceMask and ThreadMask need to be set for certain L3 events.
232 * For other events, the two fields do not affect the count.
233 */
234 if (l3_mask && is_llc_event(event))
235 hwc->config |= l3_thread_slice_mask(event->attr.config);
236
237 uncore = event_to_amd_uncore(event);
238 if (!uncore)
239 return -ENODEV;
240
241 /*
242 * since request can come in to any of the shared cores, we will remap
243 * to a single common cpu.
244 */
245 event->cpu = uncore->cpu;
246
247 return 0;
248 }
249
250 static ssize_t amd_uncore_attr_show_cpumask(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
253 {
254 cpumask_t *active_mask;
255 struct pmu *pmu = dev_get_drvdata(dev);
256
257 if (pmu->type == amd_nb_pmu.type)
258 active_mask = &amd_nb_active_mask;
259 else if (pmu->type == amd_llc_pmu.type)
260 active_mask = &amd_llc_active_mask;
261 else
262 return 0;
263
264 return cpumap_print_to_pagebuf(true, buf, active_mask);
265 }
266 static DEVICE_ATTR(cpumask, S_IRUGO, amd_uncore_attr_show_cpumask, NULL);
267
268 static struct attribute *amd_uncore_attrs[] = {
269 &dev_attr_cpumask.attr,
270 NULL,
271 };
272
273 static struct attribute_group amd_uncore_attr_group = {
274 .attrs = amd_uncore_attrs,
275 };
276
277 #define DEFINE_UNCORE_FORMAT_ATTR(_var, _name, _format) \
278 static ssize_t __uncore_##_var##_show(struct kobject *kobj, \
279 struct kobj_attribute *attr, \
280 char *page) \
281 { \
282 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
283 return sprintf(page, _format "\n"); \
284 } \
285 static struct kobj_attribute format_attr_##_var = \
286 __ATTR(_name, 0444, __uncore_##_var##_show, NULL)
287
288 DEFINE_UNCORE_FORMAT_ATTR(event12, event, "config:0-7,32-35");
289 DEFINE_UNCORE_FORMAT_ATTR(event14, event, "config:0-7,32-35,59-60"); /* F17h+ DF */
290 DEFINE_UNCORE_FORMAT_ATTR(event8, event, "config:0-7"); /* F17h+ L3 */
291 DEFINE_UNCORE_FORMAT_ATTR(umask, umask, "config:8-15");
292 DEFINE_UNCORE_FORMAT_ATTR(coreid, coreid, "config:42-44"); /* F19h L3 */
293 DEFINE_UNCORE_FORMAT_ATTR(slicemask, slicemask, "config:48-51"); /* F17h L3 */
294 DEFINE_UNCORE_FORMAT_ATTR(threadmask8, threadmask, "config:56-63"); /* F17h L3 */
295 DEFINE_UNCORE_FORMAT_ATTR(threadmask2, threadmask, "config:56-57"); /* F19h L3 */
296 DEFINE_UNCORE_FORMAT_ATTR(enallslices, enallslices, "config:46"); /* F19h L3 */
297 DEFINE_UNCORE_FORMAT_ATTR(enallcores, enallcores, "config:47"); /* F19h L3 */
298 DEFINE_UNCORE_FORMAT_ATTR(sliceid, sliceid, "config:48-50"); /* F19h L3 */
299
300 static struct attribute *amd_uncore_df_format_attr[] = {
301 &format_attr_event12.attr, /* event14 if F17h+ */
302 &format_attr_umask.attr,
303 NULL,
304 };
305
306 static struct attribute *amd_uncore_l3_format_attr[] = {
307 &format_attr_event12.attr, /* event8 if F17h+ */
308 &format_attr_umask.attr,
309 NULL, /* slicemask if F17h, coreid if F19h */
310 NULL, /* threadmask8 if F17h, enallslices if F19h */
311 NULL, /* enallcores if F19h */
312 NULL, /* sliceid if F19h */
313 NULL, /* threadmask2 if F19h */
314 NULL,
315 };
316
317 static struct attribute_group amd_uncore_df_format_group = {
318 .name = "format",
319 .attrs = amd_uncore_df_format_attr,
320 };
321
322 static struct attribute_group amd_uncore_l3_format_group = {
323 .name = "format",
324 .attrs = amd_uncore_l3_format_attr,
325 };
326
327 static const struct attribute_group *amd_uncore_df_attr_groups[] = {
328 &amd_uncore_attr_group,
329 &amd_uncore_df_format_group,
330 NULL,
331 };
332
333 static const struct attribute_group *amd_uncore_l3_attr_groups[] = {
334 &amd_uncore_attr_group,
335 &amd_uncore_l3_format_group,
336 NULL,
337 };
338
339 static struct pmu amd_nb_pmu = {
340 .task_ctx_nr = perf_invalid_context,
341 .attr_groups = amd_uncore_df_attr_groups,
342 .name = "amd_nb",
343 .event_init = amd_uncore_event_init,
344 .add = amd_uncore_add,
345 .del = amd_uncore_del,
346 .start = amd_uncore_start,
347 .stop = amd_uncore_stop,
348 .read = amd_uncore_read,
349 .capabilities = PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_NO_INTERRUPT,
350 };
351
352 static struct pmu amd_llc_pmu = {
353 .task_ctx_nr = perf_invalid_context,
354 .attr_groups = amd_uncore_l3_attr_groups,
355 .name = "amd_l2",
356 .event_init = amd_uncore_event_init,
357 .add = amd_uncore_add,
358 .del = amd_uncore_del,
359 .start = amd_uncore_start,
360 .stop = amd_uncore_stop,
361 .read = amd_uncore_read,
362 .capabilities = PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_NO_INTERRUPT,
363 };
364
365 static struct amd_uncore *amd_uncore_alloc(unsigned int cpu)
366 {
367 return kzalloc_node(sizeof(struct amd_uncore), GFP_KERNEL,
368 cpu_to_node(cpu));
369 }
370
371 static int amd_uncore_cpu_up_prepare(unsigned int cpu)
372 {
373 struct amd_uncore *uncore_nb = NULL, *uncore_llc;
374
375 if (amd_uncore_nb) {
376 uncore_nb = amd_uncore_alloc(cpu);
377 if (!uncore_nb)
378 goto fail;
379 uncore_nb->cpu = cpu;
380 uncore_nb->num_counters = num_counters_nb;
381 uncore_nb->rdpmc_base = RDPMC_BASE_NB;
382 uncore_nb->msr_base = MSR_F15H_NB_PERF_CTL;
383 uncore_nb->active_mask = &amd_nb_active_mask;
384 uncore_nb->pmu = &amd_nb_pmu;
385 uncore_nb->id = -1;
386 *per_cpu_ptr(amd_uncore_nb, cpu) = uncore_nb;
387 }
388
389 if (amd_uncore_llc) {
390 uncore_llc = amd_uncore_alloc(cpu);
391 if (!uncore_llc)
392 goto fail;
393 uncore_llc->cpu = cpu;
394 uncore_llc->num_counters = num_counters_llc;
395 uncore_llc->rdpmc_base = RDPMC_BASE_LLC;
396 uncore_llc->msr_base = MSR_F16H_L2I_PERF_CTL;
397 uncore_llc->active_mask = &amd_llc_active_mask;
398 uncore_llc->pmu = &amd_llc_pmu;
399 uncore_llc->id = -1;
400 *per_cpu_ptr(amd_uncore_llc, cpu) = uncore_llc;
401 }
402
403 return 0;
404
405 fail:
406 if (amd_uncore_nb)
407 *per_cpu_ptr(amd_uncore_nb, cpu) = NULL;
408 kfree(uncore_nb);
409 return -ENOMEM;
410 }
411
412 static struct amd_uncore *
413 amd_uncore_find_online_sibling(struct amd_uncore *this,
414 struct amd_uncore * __percpu *uncores)
415 {
416 unsigned int cpu;
417 struct amd_uncore *that;
418
419 for_each_online_cpu(cpu) {
420 that = *per_cpu_ptr(uncores, cpu);
421
422 if (!that)
423 continue;
424
425 if (this == that)
426 continue;
427
428 if (this->id == that->id) {
429 hlist_add_head(&this->node, &uncore_unused_list);
430 this = that;
431 break;
432 }
433 }
434
435 this->refcnt++;
436 return this;
437 }
438
439 static int amd_uncore_cpu_starting(unsigned int cpu)
440 {
441 unsigned int eax, ebx, ecx, edx;
442 struct amd_uncore *uncore;
443
444 if (amd_uncore_nb) {
445 uncore = *per_cpu_ptr(amd_uncore_nb, cpu);
446 cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
447 uncore->id = ecx & 0xff;
448
449 uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_nb);
450 *per_cpu_ptr(amd_uncore_nb, cpu) = uncore;
451 }
452
453 if (amd_uncore_llc) {
454 uncore = *per_cpu_ptr(amd_uncore_llc, cpu);
455 uncore->id = per_cpu(cpu_llc_id, cpu);
456
457 uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_llc);
458 *per_cpu_ptr(amd_uncore_llc, cpu) = uncore;
459 }
460
461 return 0;
462 }
463
464 static void uncore_clean_online(void)
465 {
466 struct amd_uncore *uncore;
467 struct hlist_node *n;
468
469 hlist_for_each_entry_safe(uncore, n, &uncore_unused_list, node) {
470 hlist_del(&uncore->node);
471 kfree(uncore);
472 }
473 }
474
475 static void uncore_online(unsigned int cpu,
476 struct amd_uncore * __percpu *uncores)
477 {
478 struct amd_uncore *uncore = *per_cpu_ptr(uncores, cpu);
479
480 uncore_clean_online();
481
482 if (cpu == uncore->cpu)
483 cpumask_set_cpu(cpu, uncore->active_mask);
484 }
485
486 static int amd_uncore_cpu_online(unsigned int cpu)
487 {
488 if (amd_uncore_nb)
489 uncore_online(cpu, amd_uncore_nb);
490
491 if (amd_uncore_llc)
492 uncore_online(cpu, amd_uncore_llc);
493
494 return 0;
495 }
496
497 static void uncore_down_prepare(unsigned int cpu,
498 struct amd_uncore * __percpu *uncores)
499 {
500 unsigned int i;
501 struct amd_uncore *this = *per_cpu_ptr(uncores, cpu);
502
503 if (this->cpu != cpu)
504 return;
505
506 /* this cpu is going down, migrate to a shared sibling if possible */
507 for_each_online_cpu(i) {
508 struct amd_uncore *that = *per_cpu_ptr(uncores, i);
509
510 if (cpu == i)
511 continue;
512
513 if (this == that) {
514 perf_pmu_migrate_context(this->pmu, cpu, i);
515 cpumask_clear_cpu(cpu, that->active_mask);
516 cpumask_set_cpu(i, that->active_mask);
517 that->cpu = i;
518 break;
519 }
520 }
521 }
522
523 static int amd_uncore_cpu_down_prepare(unsigned int cpu)
524 {
525 if (amd_uncore_nb)
526 uncore_down_prepare(cpu, amd_uncore_nb);
527
528 if (amd_uncore_llc)
529 uncore_down_prepare(cpu, amd_uncore_llc);
530
531 return 0;
532 }
533
534 static void uncore_dead(unsigned int cpu, struct amd_uncore * __percpu *uncores)
535 {
536 struct amd_uncore *uncore = *per_cpu_ptr(uncores, cpu);
537
538 if (cpu == uncore->cpu)
539 cpumask_clear_cpu(cpu, uncore->active_mask);
540
541 if (!--uncore->refcnt)
542 kfree(uncore);
543 *per_cpu_ptr(uncores, cpu) = NULL;
544 }
545
546 static int amd_uncore_cpu_dead(unsigned int cpu)
547 {
548 if (amd_uncore_nb)
549 uncore_dead(cpu, amd_uncore_nb);
550
551 if (amd_uncore_llc)
552 uncore_dead(cpu, amd_uncore_llc);
553
554 return 0;
555 }
556
557 static int __init amd_uncore_init(void)
558 {
559 struct attribute **df_attr = amd_uncore_df_format_attr;
560 struct attribute **l3_attr = amd_uncore_l3_format_attr;
561 int ret = -ENODEV;
562
563 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
564 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
565 return -ENODEV;
566
567 if (!boot_cpu_has(X86_FEATURE_TOPOEXT))
568 return -ENODEV;
569
570 num_counters_nb = NUM_COUNTERS_NB;
571 num_counters_llc = NUM_COUNTERS_L2;
572 if (boot_cpu_data.x86 >= 0x17) {
573 /*
574 * For F17h and above, the Northbridge counters are
575 * repurposed as Data Fabric counters. Also, L3
576 * counters are supported too. The PMUs are exported
577 * based on family as either L2 or L3 and NB or DF.
578 */
579 num_counters_llc = NUM_COUNTERS_L3;
580 amd_nb_pmu.name = "amd_df";
581 amd_llc_pmu.name = "amd_l3";
582 l3_mask = true;
583 }
584
585 if (boot_cpu_has(X86_FEATURE_PERFCTR_NB)) {
586 if (boot_cpu_data.x86 >= 0x17)
587 *df_attr = &format_attr_event14.attr;
588
589 amd_uncore_nb = alloc_percpu(struct amd_uncore *);
590 if (!amd_uncore_nb) {
591 ret = -ENOMEM;
592 goto fail_nb;
593 }
594 ret = perf_pmu_register(&amd_nb_pmu, amd_nb_pmu.name, -1);
595 if (ret)
596 goto fail_nb;
597
598 pr_info("%d %s %s counters detected\n", num_counters_nb,
599 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON ? "HYGON" : "",
600 amd_nb_pmu.name);
601
602 ret = 0;
603 }
604
605 if (boot_cpu_has(X86_FEATURE_PERFCTR_LLC)) {
606 if (boot_cpu_data.x86 >= 0x19) {
607 *l3_attr++ = &format_attr_event8.attr;
608 *l3_attr++ = &format_attr_umask.attr;
609 *l3_attr++ = &format_attr_coreid.attr;
610 *l3_attr++ = &format_attr_enallslices.attr;
611 *l3_attr++ = &format_attr_enallcores.attr;
612 *l3_attr++ = &format_attr_sliceid.attr;
613 *l3_attr++ = &format_attr_threadmask2.attr;
614 } else if (boot_cpu_data.x86 >= 0x17) {
615 *l3_attr++ = &format_attr_event8.attr;
616 *l3_attr++ = &format_attr_umask.attr;
617 *l3_attr++ = &format_attr_slicemask.attr;
618 *l3_attr++ = &format_attr_threadmask8.attr;
619 }
620
621 amd_uncore_llc = alloc_percpu(struct amd_uncore *);
622 if (!amd_uncore_llc) {
623 ret = -ENOMEM;
624 goto fail_llc;
625 }
626 ret = perf_pmu_register(&amd_llc_pmu, amd_llc_pmu.name, -1);
627 if (ret)
628 goto fail_llc;
629
630 pr_info("%d %s %s counters detected\n", num_counters_llc,
631 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON ? "HYGON" : "",
632 amd_llc_pmu.name);
633 ret = 0;
634 }
635
636 /*
637 * Install callbacks. Core will call them for each online cpu.
638 */
639 if (cpuhp_setup_state(CPUHP_PERF_X86_AMD_UNCORE_PREP,
640 "perf/x86/amd/uncore:prepare",
641 amd_uncore_cpu_up_prepare, amd_uncore_cpu_dead))
642 goto fail_llc;
643
644 if (cpuhp_setup_state(CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
645 "perf/x86/amd/uncore:starting",
646 amd_uncore_cpu_starting, NULL))
647 goto fail_prep;
648 if (cpuhp_setup_state(CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
649 "perf/x86/amd/uncore:online",
650 amd_uncore_cpu_online,
651 amd_uncore_cpu_down_prepare))
652 goto fail_start;
653 return 0;
654
655 fail_start:
656 cpuhp_remove_state(CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING);
657 fail_prep:
658 cpuhp_remove_state(CPUHP_PERF_X86_AMD_UNCORE_PREP);
659 fail_llc:
660 if (boot_cpu_has(X86_FEATURE_PERFCTR_NB))
661 perf_pmu_unregister(&amd_nb_pmu);
662 if (amd_uncore_llc)
663 free_percpu(amd_uncore_llc);
664 fail_nb:
665 if (amd_uncore_nb)
666 free_percpu(amd_uncore_nb);
667
668 return ret;
669 }
670 device_initcall(amd_uncore_init);
Linux with added FPC-III support