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x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
[linux/fpc-iii.git] / arch / x86 / kernel / cpu / perf_event_amd_ibs.c
blob4b8e4d3cd6ea62bc9c9047e869fa84cbd9cbe33a
1 /*
2 * Performance events - AMD IBS
3 *
4 * Copyright (C) 2011 Advanced Micro Devices, Inc., Robert Richter
5 *
6 * For licencing details see kernel-base/COPYING
7 */
8
9 #include <linux/perf_event.h>
10 #include <linux/module.h>
11 #include <linux/pci.h>
12 #include <linux/ptrace.h>
13 #include <linux/syscore_ops.h>
14
15 #include <asm/apic.h>
16
17 #include "perf_event.h"
18
19 static u32 ibs_caps;
20
21 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_AMD)
22
23 #include <linux/kprobes.h>
24 #include <linux/hardirq.h>
25
26 #include <asm/nmi.h>
27
28 #define IBS_FETCH_CONFIG_MASK (IBS_FETCH_RAND_EN | IBS_FETCH_MAX_CNT)
29 #define IBS_OP_CONFIG_MASK IBS_OP_MAX_CNT
30
31 enum ibs_states {
32 IBS_ENABLED = 0,
33 IBS_STARTED = 1,
34 IBS_STOPPING = 2,
35
36 IBS_MAX_STATES,
37 };
38
39 struct cpu_perf_ibs {
40 struct perf_event *event;
41 unsigned long state[BITS_TO_LONGS(IBS_MAX_STATES)];
42 };
43
44 struct perf_ibs {
45 struct pmu pmu;
46 unsigned int msr;
47 u64 config_mask;
48 u64 cnt_mask;
49 u64 enable_mask;
50 u64 valid_mask;
51 u64 max_period;
52 unsigned long offset_mask[1];
53 int offset_max;
54 struct cpu_perf_ibs __percpu *pcpu;
55
56 struct attribute **format_attrs;
57 struct attribute_group format_group;
58 const struct attribute_group *attr_groups[2];
59
60 u64 (*get_count)(u64 config);
61 };
62
63 struct perf_ibs_data {
64 u32 size;
65 union {
66 u32 data[0]; /* data buffer starts here */
67 u32 caps;
68 };
69 u64 regs[MSR_AMD64_IBS_REG_COUNT_MAX];
70 };
71
72 static int
73 perf_event_set_period(struct hw_perf_event *hwc, u64 min, u64 max, u64 *hw_period)
74 {
75 s64 left = local64_read(&hwc->period_left);
76 s64 period = hwc->sample_period;
77 int overflow = 0;
78
79 /*
80 * If we are way outside a reasonable range then just skip forward:
81 */
82 if (unlikely(left <= -period)) {
83 left = period;
84 local64_set(&hwc->period_left, left);
85 hwc->last_period = period;
86 overflow = 1;
87 }
88
89 if (unlikely(left < (s64)min)) {
90 left += period;
91 local64_set(&hwc->period_left, left);
92 hwc->last_period = period;
93 overflow = 1;
94 }
95
96 /*
97 * If the hw period that triggers the sw overflow is too short
98 * we might hit the irq handler. This biases the results.
99 * Thus we shorten the next-to-last period and set the last
100 * period to the max period.
101 */
102 if (left > max) {
103 left -= max;
104 if (left > max)
105 left = max;
106 else if (left < min)
107 left = min;
108 }
109
110 *hw_period = (u64)left;
111
112 return overflow;
113 }
114
115 static int
116 perf_event_try_update(struct perf_event *event, u64 new_raw_count, int width)
117 {
118 struct hw_perf_event *hwc = &event->hw;
119 int shift = 64 - width;
120 u64 prev_raw_count;
121 u64 delta;
122
123 /*
124 * Careful: an NMI might modify the previous event value.
125 *
126 * Our tactic to handle this is to first atomically read and
127 * exchange a new raw count - then add that new-prev delta
128 * count to the generic event atomically:
129 */
130 prev_raw_count = local64_read(&hwc->prev_count);
131 if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
132 new_raw_count) != prev_raw_count)
133 return 0;
134
135 /*
136 * Now we have the new raw value and have updated the prev
137 * timestamp already. We can now calculate the elapsed delta
138 * (event-)time and add that to the generic event.
139 *
140 * Careful, not all hw sign-extends above the physical width
141 * of the count.
142 */
143 delta = (new_raw_count << shift) - (prev_raw_count << shift);
144 delta >>= shift;
145
146 local64_add(delta, &event->count);
147 local64_sub(delta, &hwc->period_left);
148
149 return 1;
150 }
151
152 static struct perf_ibs perf_ibs_fetch;
153 static struct perf_ibs perf_ibs_op;
154
155 static struct perf_ibs *get_ibs_pmu(int type)
156 {
157 if (perf_ibs_fetch.pmu.type == type)
158 return &perf_ibs_fetch;
159 if (perf_ibs_op.pmu.type == type)
160 return &perf_ibs_op;
161 return NULL;
162 }
163
164 /*
165 * Use IBS for precise event sampling:
166 *
167 * perf record -a -e cpu-cycles:p ... # use ibs op counting cycle count
168 * perf record -a -e r076:p ... # same as -e cpu-cycles:p
169 * perf record -a -e r0C1:p ... # use ibs op counting micro-ops
170 *
171 * IbsOpCntCtl (bit 19) of IBS Execution Control Register (IbsOpCtl,
172 * MSRC001_1033) is used to select either cycle or micro-ops counting
173 * mode.
174 *
175 * The rip of IBS samples has skid 0. Thus, IBS supports precise
176 * levels 1 and 2 and the PERF_EFLAGS_EXACT is set. In rare cases the
177 * rip is invalid when IBS was not able to record the rip correctly.
178 * We clear PERF_EFLAGS_EXACT and take the rip from pt_regs then.
179 *
180 */
181 static int perf_ibs_precise_event(struct perf_event *event, u64 *config)
182 {
183 switch (event->attr.precise_ip) {
184 case 0:
185 return -ENOENT;
186 case 1:
187 case 2:
188 break;
189 default:
190 return -EOPNOTSUPP;
191 }
192
193 switch (event->attr.type) {
194 case PERF_TYPE_HARDWARE:
195 switch (event->attr.config) {
196 case PERF_COUNT_HW_CPU_CYCLES:
197 *config = 0;
198 return 0;
199 }
200 break;
201 case PERF_TYPE_RAW:
202 switch (event->attr.config) {
203 case 0x0076:
204 *config = 0;
205 return 0;
206 case 0x00C1:
207 *config = IBS_OP_CNT_CTL;
208 return 0;
209 }
210 break;
211 default:
212 return -ENOENT;
213 }
214
215 return -EOPNOTSUPP;
216 }
217
218 static const struct perf_event_attr ibs_notsupp = {
219 .exclude_user = 1,
220 .exclude_kernel = 1,
221 .exclude_hv = 1,
222 .exclude_idle = 1,
223 .exclude_host = 1,
224 .exclude_guest = 1,
225 };
226
227 static int perf_ibs_init(struct perf_event *event)
228 {
229 struct hw_perf_event *hwc = &event->hw;
230 struct perf_ibs *perf_ibs;
231 u64 max_cnt, config;
232 int ret;
233
234 perf_ibs = get_ibs_pmu(event->attr.type);
235 if (perf_ibs) {
236 config = event->attr.config;
237 } else {
238 perf_ibs = &perf_ibs_op;
239 ret = perf_ibs_precise_event(event, &config);
240 if (ret)
241 return ret;
242 }
243
244 if (event->pmu != &perf_ibs->pmu)
245 return -ENOENT;
246
247 if (perf_flags(&event->attr) & perf_flags(&ibs_notsupp))
248 return -EINVAL;
249
250 if (config & ~perf_ibs->config_mask)
251 return -EINVAL;
252
253 if (hwc->sample_period) {
254 if (config & perf_ibs->cnt_mask)
255 /* raw max_cnt may not be set */
256 return -EINVAL;
257 if (!event->attr.sample_freq && hwc->sample_period & 0x0f)
258 /*
259 * lower 4 bits can not be set in ibs max cnt,
260 * but allowing it in case we adjust the
261 * sample period to set a frequency.
262 */
263 return -EINVAL;
264 hwc->sample_period &= ~0x0FULL;
265 if (!hwc->sample_period)
266 hwc->sample_period = 0x10;
267 } else {
268 max_cnt = config & perf_ibs->cnt_mask;
269 config &= ~perf_ibs->cnt_mask;
270 event->attr.sample_period = max_cnt << 4;
271 hwc->sample_period = event->attr.sample_period;
272 }
273
274 if (!hwc->sample_period)
275 return -EINVAL;
276
277 /*
278 * If we modify hwc->sample_period, we also need to update
279 * hwc->last_period and hwc->period_left.
280 */
281 hwc->last_period = hwc->sample_period;
282 local64_set(&hwc->period_left, hwc->sample_period);
283
284 hwc->config_base = perf_ibs->msr;
285 hwc->config = config;
286
287 return 0;
288 }
289
290 static int perf_ibs_set_period(struct perf_ibs *perf_ibs,
291 struct hw_perf_event *hwc, u64 *period)
292 {
293 int overflow;
294
295 /* ignore lower 4 bits in min count: */
296 overflow = perf_event_set_period(hwc, 1<<4, perf_ibs->max_period, period);
297 local64_set(&hwc->prev_count, 0);
298
299 return overflow;
300 }
301
302 static u64 get_ibs_fetch_count(u64 config)
303 {
304 return (config & IBS_FETCH_CNT) >> 12;
305 }
306
307 static u64 get_ibs_op_count(u64 config)
308 {
309 u64 count = 0;
310
311 if (config & IBS_OP_VAL)
312 count += (config & IBS_OP_MAX_CNT) << 4; /* cnt rolled over */
313
314 if (ibs_caps & IBS_CAPS_RDWROPCNT)
315 count += (config & IBS_OP_CUR_CNT) >> 32;
316
317 return count;
318 }
319
320 static void
321 perf_ibs_event_update(struct perf_ibs *perf_ibs, struct perf_event *event,
322 u64 *config)
323 {
324 u64 count = perf_ibs->get_count(*config);
325
326 /*
327 * Set width to 64 since we do not overflow on max width but
328 * instead on max count. In perf_ibs_set_period() we clear
329 * prev count manually on overflow.
330 */
331 while (!perf_event_try_update(event, count, 64)) {
332 rdmsrl(event->hw.config_base, *config);
333 count = perf_ibs->get_count(*config);
334 }
335 }
336
337 static inline void perf_ibs_enable_event(struct perf_ibs *perf_ibs,
338 struct hw_perf_event *hwc, u64 config)
339 {
340 wrmsrl(hwc->config_base, hwc->config | config | perf_ibs->enable_mask);
341 }
342
343 /*
344 * Erratum #420 Instruction-Based Sampling Engine May Generate
345 * Interrupt that Cannot Be Cleared:
346 *
347 * Must clear counter mask first, then clear the enable bit. See
348 * Revision Guide for AMD Family 10h Processors, Publication #41322.
349 */
350 static inline void perf_ibs_disable_event(struct perf_ibs *perf_ibs,
351 struct hw_perf_event *hwc, u64 config)
352 {
353 config &= ~perf_ibs->cnt_mask;
354 wrmsrl(hwc->config_base, config);
355 config &= ~perf_ibs->enable_mask;
356 wrmsrl(hwc->config_base, config);
357 }
358
359 /*
360 * We cannot restore the ibs pmu state, so we always needs to update
361 * the event while stopping it and then reset the state when starting
362 * again. Thus, ignoring PERF_EF_RELOAD and PERF_EF_UPDATE flags in
363 * perf_ibs_start()/perf_ibs_stop() and instead always do it.
364 */
365 static void perf_ibs_start(struct perf_event *event, int flags)
366 {
367 struct hw_perf_event *hwc = &event->hw;
368 struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu);
369 struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu);
370 u64 period;
371
372 if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED)))
373 return;
374
375 WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
376 hwc->state = 0;
377
378 perf_ibs_set_period(perf_ibs, hwc, &period);
379 set_bit(IBS_STARTED, pcpu->state);
380 perf_ibs_enable_event(perf_ibs, hwc, period >> 4);
381
382 perf_event_update_userpage(event);
383 }
384
385 static void perf_ibs_stop(struct perf_event *event, int flags)
386 {
387 struct hw_perf_event *hwc = &event->hw;
388 struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu);
389 struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu);
390 u64 config;
391 int stopping;
392
393 stopping = test_and_clear_bit(IBS_STARTED, pcpu->state);
394
395 if (!stopping && (hwc->state & PERF_HES_UPTODATE))
396 return;
397
398 rdmsrl(hwc->config_base, config);
399
400 if (stopping) {
401 set_bit(IBS_STOPPING, pcpu->state);
402 perf_ibs_disable_event(perf_ibs, hwc, config);
403 WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
404 hwc->state |= PERF_HES_STOPPED;
405 }
406
407 if (hwc->state & PERF_HES_UPTODATE)
408 return;
409
410 /*
411 * Clear valid bit to not count rollovers on update, rollovers
412 * are only updated in the irq handler.
413 */
414 config &= ~perf_ibs->valid_mask;
415
416 perf_ibs_event_update(perf_ibs, event, &config);
417 hwc->state |= PERF_HES_UPTODATE;
418 }
419
420 static int perf_ibs_add(struct perf_event *event, int flags)
421 {
422 struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu);
423 struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu);
424
425 if (test_and_set_bit(IBS_ENABLED, pcpu->state))
426 return -ENOSPC;
427
428 event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
429
430 pcpu->event = event;
431
432 if (flags & PERF_EF_START)
433 perf_ibs_start(event, PERF_EF_RELOAD);
434
435 return 0;
436 }
437
438 static void perf_ibs_del(struct perf_event *event, int flags)
439 {
440 struct perf_ibs *perf_ibs = container_of(event->pmu, struct perf_ibs, pmu);
441 struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu);
442
443 if (!test_and_clear_bit(IBS_ENABLED, pcpu->state))
444 return;
445
446 perf_ibs_stop(event, PERF_EF_UPDATE);
447
448 pcpu->event = NULL;
449
450 perf_event_update_userpage(event);
451 }
452
453 static void perf_ibs_read(struct perf_event *event) { }
454
455 PMU_FORMAT_ATTR(rand_en, "config:57");
456 PMU_FORMAT_ATTR(cnt_ctl, "config:19");
457
458 static struct attribute *ibs_fetch_format_attrs[] = {
459 &format_attr_rand_en.attr,
460 NULL,
461 };
462
463 static struct attribute *ibs_op_format_attrs[] = {
464 NULL, /* &format_attr_cnt_ctl.attr if IBS_CAPS_OPCNT */
465 NULL,
466 };
467
468 static struct perf_ibs perf_ibs_fetch = {
469 .pmu = {
470 .task_ctx_nr = perf_invalid_context,
471
472 .event_init = perf_ibs_init,
473 .add = perf_ibs_add,
474 .del = perf_ibs_del,
475 .start = perf_ibs_start,
476 .stop = perf_ibs_stop,
477 .read = perf_ibs_read,
478 },
479 .msr = MSR_AMD64_IBSFETCHCTL,
480 .config_mask = IBS_FETCH_CONFIG_MASK,
481 .cnt_mask = IBS_FETCH_MAX_CNT,
482 .enable_mask = IBS_FETCH_ENABLE,
483 .valid_mask = IBS_FETCH_VAL,
484 .max_period = IBS_FETCH_MAX_CNT << 4,
485 .offset_mask = { MSR_AMD64_IBSFETCH_REG_MASK },
486 .offset_max = MSR_AMD64_IBSFETCH_REG_COUNT,
487 .format_attrs = ibs_fetch_format_attrs,
488
489 .get_count = get_ibs_fetch_count,
490 };
491
492 static struct perf_ibs perf_ibs_op = {
493 .pmu = {
494 .task_ctx_nr = perf_invalid_context,
495
496 .event_init = perf_ibs_init,
497 .add = perf_ibs_add,
498 .del = perf_ibs_del,
499 .start = perf_ibs_start,
500 .stop = perf_ibs_stop,
501 .read = perf_ibs_read,
502 },
503 .msr = MSR_AMD64_IBSOPCTL,
504 .config_mask = IBS_OP_CONFIG_MASK,
505 .cnt_mask = IBS_OP_MAX_CNT,
506 .enable_mask = IBS_OP_ENABLE,
507 .valid_mask = IBS_OP_VAL,
508 .max_period = IBS_OP_MAX_CNT << 4,
509 .offset_mask = { MSR_AMD64_IBSOP_REG_MASK },
510 .offset_max = MSR_AMD64_IBSOP_REG_COUNT,
511 .format_attrs = ibs_op_format_attrs,
512
513 .get_count = get_ibs_op_count,
514 };
515
516 static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
517 {
518 struct cpu_perf_ibs *pcpu = this_cpu_ptr(perf_ibs->pcpu);
519 struct perf_event *event = pcpu->event;
520 struct hw_perf_event *hwc = &event->hw;
521 struct perf_sample_data data;
522 struct perf_raw_record raw;
523 struct pt_regs regs;
524 struct perf_ibs_data ibs_data;
525 int offset, size, check_rip, offset_max, throttle = 0;
526 unsigned int msr;
527 u64 *buf, *config, period;
528
529 if (!test_bit(IBS_STARTED, pcpu->state)) {
530 /*
531 * Catch spurious interrupts after stopping IBS: After
532 * disabling IBS there could be still incoming NMIs
533 * with samples that even have the valid bit cleared.
534 * Mark all this NMIs as handled.
535 */
536 return test_and_clear_bit(IBS_STOPPING, pcpu->state) ? 1 : 0;
537 }
538
539 msr = hwc->config_base;
540 buf = ibs_data.regs;
541 rdmsrl(msr, *buf);
542 if (!(*buf++ & perf_ibs->valid_mask))
543 return 0;
544
545 config = &ibs_data.regs[0];
546 perf_ibs_event_update(perf_ibs, event, config);
547 perf_sample_data_init(&data, 0, hwc->last_period);
548 if (!perf_ibs_set_period(perf_ibs, hwc, &period))
549 goto out; /* no sw counter overflow */
550
551 ibs_data.caps = ibs_caps;
552 size = 1;
553 offset = 1;
554 check_rip = (perf_ibs == &perf_ibs_op && (ibs_caps & IBS_CAPS_RIPINVALIDCHK));
555 if (event->attr.sample_type & PERF_SAMPLE_RAW)
556 offset_max = perf_ibs->offset_max;
557 else if (check_rip)
558 offset_max = 2;
559 else
560 offset_max = 1;
561 do {
562 rdmsrl(msr + offset, *buf++);
563 size++;
564 offset = find_next_bit(perf_ibs->offset_mask,
565 perf_ibs->offset_max,
566 offset + 1);
567 } while (offset < offset_max);
568 ibs_data.size = sizeof(u64) * size;
569
570 regs = *iregs;
571 if (check_rip && (ibs_data.regs[2] & IBS_RIP_INVALID)) {
572 regs.flags &= ~PERF_EFLAGS_EXACT;
573 } else {
574 set_linear_ip(&regs, ibs_data.regs[1]);
575 regs.flags |= PERF_EFLAGS_EXACT;
576 }
577
578 if (event->attr.sample_type & PERF_SAMPLE_RAW) {
579 raw.size = sizeof(u32) + ibs_data.size;
580 raw.data = ibs_data.data;
581 data.raw = &raw;
582 }
583
584 throttle = perf_event_overflow(event, &data, &regs);
585 out:
586 if (throttle)
587 perf_ibs_disable_event(perf_ibs, hwc, *config);
588 else
589 perf_ibs_enable_event(perf_ibs, hwc, period >> 4);
590
591 perf_event_update_userpage(event);
592
593 return 1;
594 }
595
596 static int __kprobes
597 perf_ibs_nmi_handler(unsigned int cmd, struct pt_regs *regs)
598 {
599 int handled = 0;
600
601 handled += perf_ibs_handle_irq(&perf_ibs_fetch, regs);
602 handled += perf_ibs_handle_irq(&perf_ibs_op, regs);
603
604 if (handled)
605 inc_irq_stat(apic_perf_irqs);
606
607 return handled;
608 }
609
610 static __init int perf_ibs_pmu_init(struct perf_ibs *perf_ibs, char *name)
611 {
612 struct cpu_perf_ibs __percpu *pcpu;
613 int ret;
614
615 pcpu = alloc_percpu(struct cpu_perf_ibs);
616 if (!pcpu)
617 return -ENOMEM;
618
619 perf_ibs->pcpu = pcpu;
620
621 /* register attributes */
622 if (perf_ibs->format_attrs[0]) {
623 memset(&perf_ibs->format_group, 0, sizeof(perf_ibs->format_group));
624 perf_ibs->format_group.name = "format";
625 perf_ibs->format_group.attrs = perf_ibs->format_attrs;
626
627 memset(&perf_ibs->attr_groups, 0, sizeof(perf_ibs->attr_groups));
628 perf_ibs->attr_groups[0] = &perf_ibs->format_group;
629 perf_ibs->pmu.attr_groups = perf_ibs->attr_groups;
630 }
631
632 ret = perf_pmu_register(&perf_ibs->pmu, name, -1);
633 if (ret) {
634 perf_ibs->pcpu = NULL;
635 free_percpu(pcpu);
636 }
637
638 return ret;
639 }
640
641 static __init int perf_event_ibs_init(void)
642 {
643 struct attribute **attr = ibs_op_format_attrs;
644
645 if (!ibs_caps)
646 return -ENODEV; /* ibs not supported by the cpu */
647
648 perf_ibs_pmu_init(&perf_ibs_fetch, "ibs_fetch");
649
650 if (ibs_caps & IBS_CAPS_OPCNT) {
651 perf_ibs_op.config_mask |= IBS_OP_CNT_CTL;
652 *attr++ = &format_attr_cnt_ctl.attr;
653 }
654 perf_ibs_pmu_init(&perf_ibs_op, "ibs_op");
655
656 register_nmi_handler(NMI_LOCAL, perf_ibs_nmi_handler, 0, "perf_ibs");
657 printk(KERN_INFO "perf: AMD IBS detected (0x%08x)\n", ibs_caps);
658
659 return 0;
660 }
661
662 #else /* defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_AMD) */
663
664 static __init int perf_event_ibs_init(void) { return 0; }
665
666 #endif
667
668 /* IBS - apic initialization, for perf and oprofile */
669
670 static __init u32 __get_ibs_caps(void)
671 {
672 u32 caps;
673 unsigned int max_level;
674
675 if (!boot_cpu_has(X86_FEATURE_IBS))
676 return 0;
677
678 /* check IBS cpuid feature flags */
679 max_level = cpuid_eax(0x80000000);
680 if (max_level < IBS_CPUID_FEATURES)
681 return IBS_CAPS_DEFAULT;
682
683 caps = cpuid_eax(IBS_CPUID_FEATURES);
684 if (!(caps & IBS_CAPS_AVAIL))
685 /* cpuid flags not valid */
686 return IBS_CAPS_DEFAULT;
687
688 return caps;
689 }
690
691 u32 get_ibs_caps(void)
692 {
693 return ibs_caps;
694 }
695
696 EXPORT_SYMBOL(get_ibs_caps);
697
698 static inline int get_eilvt(int offset)
699 {
700 return !setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 1);
701 }
702
703 static inline int put_eilvt(int offset)
704 {
705 return !setup_APIC_eilvt(offset, 0, 0, 1);
706 }
707
708 /*
709 * Check and reserve APIC extended interrupt LVT offset for IBS if available.
710 */
711 static inline int ibs_eilvt_valid(void)
712 {
713 int offset;
714 u64 val;
715 int valid = 0;
716
717 preempt_disable();
718
719 rdmsrl(MSR_AMD64_IBSCTL, val);
720 offset = val & IBSCTL_LVT_OFFSET_MASK;
721
722 if (!(val & IBSCTL_LVT_OFFSET_VALID)) {
723 pr_err(FW_BUG "cpu %d, invalid IBS interrupt offset %d (MSR%08X=0x%016llx)\n",
724 smp_processor_id(), offset, MSR_AMD64_IBSCTL, val);
725 goto out;
726 }
727
728 if (!get_eilvt(offset)) {
729 pr_err(FW_BUG "cpu %d, IBS interrupt offset %d not available (MSR%08X=0x%016llx)\n",
730 smp_processor_id(), offset, MSR_AMD64_IBSCTL, val);
731 goto out;
732 }
733
734 valid = 1;
735 out:
736 preempt_enable();
737
738 return valid;
739 }
740
741 static int setup_ibs_ctl(int ibs_eilvt_off)
742 {
743 struct pci_dev *cpu_cfg;
744 int nodes;
745 u32 value = 0;
746
747 nodes = 0;
748 cpu_cfg = NULL;
749 do {
750 cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD,
751 PCI_DEVICE_ID_AMD_10H_NB_MISC,
752 cpu_cfg);
753 if (!cpu_cfg)
754 break;
755 ++nodes;
756 pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off
757 | IBSCTL_LVT_OFFSET_VALID);
758 pci_read_config_dword(cpu_cfg, IBSCTL, &value);
759 if (value != (ibs_eilvt_off | IBSCTL_LVT_OFFSET_VALID)) {
760 pci_dev_put(cpu_cfg);
761 printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
762 "IBSCTL = 0x%08x\n", value);
763 return -EINVAL;
764 }
765 } while (1);
766
767 if (!nodes) {
768 printk(KERN_DEBUG "No CPU node configured for IBS\n");
769 return -ENODEV;
770 }
771
772 return 0;
773 }
774
775 /*
776 * This runs only on the current cpu. We try to find an LVT offset and
777 * setup the local APIC. For this we must disable preemption. On
778 * success we initialize all nodes with this offset. This updates then
779 * the offset in the IBS_CTL per-node msr. The per-core APIC setup of
780 * the IBS interrupt vector is handled by perf_ibs_cpu_notifier that
781 * is using the new offset.
782 */
783 static int force_ibs_eilvt_setup(void)
784 {
785 int offset;
786 int ret;
787
788 preempt_disable();
789 /* find the next free available EILVT entry, skip offset 0 */
790 for (offset = 1; offset < APIC_EILVT_NR_MAX; offset++) {
791 if (get_eilvt(offset))
792 break;
793 }
794 preempt_enable();
795
796 if (offset == APIC_EILVT_NR_MAX) {
797 printk(KERN_DEBUG "No EILVT entry available\n");
798 return -EBUSY;
799 }
800
801 ret = setup_ibs_ctl(offset);
802 if (ret)
803 goto out;
804
805 if (!ibs_eilvt_valid()) {
806 ret = -EFAULT;
807 goto out;
808 }
809
810 pr_info("IBS: LVT offset %d assigned\n", offset);
811
812 return 0;
813 out:
814 preempt_disable();
815 put_eilvt(offset);
816 preempt_enable();
817 return ret;
818 }
819
820 static void ibs_eilvt_setup(void)
821 {
822 /*
823 * Force LVT offset assignment for family 10h: The offsets are
824 * not assigned by the BIOS for this family, so the OS is
825 * responsible for doing it. If the OS assignment fails, fall
826 * back to BIOS settings and try to setup this.
827 */
828 if (boot_cpu_data.x86 == 0x10)
829 force_ibs_eilvt_setup();
830 }
831
832 static inline int get_ibs_lvt_offset(void)
833 {
834 u64 val;
835
836 rdmsrl(MSR_AMD64_IBSCTL, val);
837 if (!(val & IBSCTL_LVT_OFFSET_VALID))
838 return -EINVAL;
839
840 return val & IBSCTL_LVT_OFFSET_MASK;
841 }
842
843 static void setup_APIC_ibs(void *dummy)
844 {
845 int offset;
846
847 offset = get_ibs_lvt_offset();
848 if (offset < 0)
849 goto failed;
850
851 if (!setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 0))
852 return;
853 failed:
854 pr_warn("perf: IBS APIC setup failed on cpu #%d\n",
855 smp_processor_id());
856 }
857
858 static void clear_APIC_ibs(void *dummy)
859 {
860 int offset;
861
862 offset = get_ibs_lvt_offset();
863 if (offset >= 0)
864 setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_FIX, 1);
865 }
866
867 #ifdef CONFIG_PM
868
869 static int perf_ibs_suspend(void)
870 {
871 clear_APIC_ibs(NULL);
872 return 0;
873 }
874
875 static void perf_ibs_resume(void)
876 {
877 ibs_eilvt_setup();
878 setup_APIC_ibs(NULL);
879 }
880
881 static struct syscore_ops perf_ibs_syscore_ops = {
882 .resume = perf_ibs_resume,
883 .suspend = perf_ibs_suspend,
884 };
885
886 static void perf_ibs_pm_init(void)
887 {
888 register_syscore_ops(&perf_ibs_syscore_ops);
889 }
890
891 #else
892
893 static inline void perf_ibs_pm_init(void) { }
894
895 #endif
896
897 static int
898 perf_ibs_cpu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
899 {
900 switch (action & ~CPU_TASKS_FROZEN) {
901 case CPU_STARTING:
902 setup_APIC_ibs(NULL);
903 break;
904 case CPU_DYING:
905 clear_APIC_ibs(NULL);
906 break;
907 default:
908 break;
909 }
910
911 return NOTIFY_OK;
912 }
913
914 static __init int amd_ibs_init(void)
915 {
916 u32 caps;
917 int ret = -EINVAL;
918
919 caps = __get_ibs_caps();
920 if (!caps)
921 return -ENODEV; /* ibs not supported by the cpu */
922
923 ibs_eilvt_setup();
924
925 if (!ibs_eilvt_valid())
926 goto out;
927
928 perf_ibs_pm_init();
929 get_online_cpus();
930 ibs_caps = caps;
931 /* make ibs_caps visible to other cpus: */
932 smp_mb();
933 perf_cpu_notifier(perf_ibs_cpu_notifier);
934 smp_call_function(setup_APIC_ibs, NULL, 1);
935 put_online_cpus();
936
937 ret = perf_event_ibs_init();
938 out:
939 if (ret)
940 pr_err("Failed to setup IBS, %d\n", ret);
941 return ret;
942 }
943
944 /* Since we need the pci subsystem to init ibs we can't do this earlier: */
945 device_initcall(amd_ibs_init);
Linux with added FPC-III support