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-rw-r--r--arch/arm/kernel/perf_event.c2276
1 files changed, 2276 insertions, 0 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
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index 000000000000..c54ceb3d1f97
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1#undef DEBUG
2
3/*
4 * ARM performance counter support.
5 *
6 * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
7 *
8 * ARMv7 support: Jean Pihet <jpihet@mvista.com>
9 * 2010 (c) MontaVista Software, LLC.
10 *
11 * This code is based on the sparc64 perf event code, which is in turn based
12 * on the x86 code. Callchain code is based on the ARM OProfile backtrace
13 * code.
14 */
15#define pr_fmt(fmt) "hw perfevents: " fmt
16
17#include <linux/interrupt.h>
18#include <linux/kernel.h>
19#include <linux/perf_event.h>
20#include <linux/spinlock.h>
21#include <linux/uaccess.h>
22
23#include <asm/cputype.h>
24#include <asm/irq.h>
25#include <asm/irq_regs.h>
26#include <asm/pmu.h>
27#include <asm/stacktrace.h>
28
29static const struct pmu_irqs *pmu_irqs;
30
31/*
32 * Hardware lock to serialize accesses to PMU registers. Needed for the
33 * read/modify/write sequences.
34 */
35DEFINE_SPINLOCK(pmu_lock);
36
37/*
38 * ARMv6 supports a maximum of 3 events, starting from index 1. If we add
39 * another platform that supports more, we need to increase this to be the
40 * largest of all platforms.
41 *
42 * ARMv7 supports up to 32 events:
43 * cycle counter CCNT + 31 events counters CNT0..30.
44 * Cortex-A8 has 1+4 counters, Cortex-A9 has 1+6 counters.
45 */
46#define ARMPMU_MAX_HWEVENTS 33
47
48/* The events for a given CPU. */
49struct cpu_hw_events {
50 /*
51 * The events that are active on the CPU for the given index. Index 0
52 * is reserved.
53 */
54 struct perf_event *events[ARMPMU_MAX_HWEVENTS];
55
56 /*
57 * A 1 bit for an index indicates that the counter is being used for
58 * an event. A 0 means that the counter can be used.
59 */
60 unsigned long used_mask[BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)];
61
62 /*
63 * A 1 bit for an index indicates that the counter is actively being
64 * used.
65 */
66 unsigned long active_mask[BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)];
67};
68DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events);
69
70struct arm_pmu {
71 char *name;
72 irqreturn_t (*handle_irq)(int irq_num, void *dev);
73 void (*enable)(struct hw_perf_event *evt, int idx);
74 void (*disable)(struct hw_perf_event *evt, int idx);
75 int (*event_map)(int evt);
76 u64 (*raw_event)(u64);
77 int (*get_event_idx)(struct cpu_hw_events *cpuc,
78 struct hw_perf_event *hwc);
79 u32 (*read_counter)(int idx);
80 void (*write_counter)(int idx, u32 val);
81 void (*start)(void);
82 void (*stop)(void);
83 int num_events;
84 u64 max_period;
85};
86
87/* Set at runtime when we know what CPU type we are. */
88static const struct arm_pmu *armpmu;
89
90#define HW_OP_UNSUPPORTED 0xFFFF
91
92#define C(_x) \
93 PERF_COUNT_HW_CACHE_##_x
94
95#define CACHE_OP_UNSUPPORTED 0xFFFF
96
97static unsigned armpmu_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
98 [PERF_COUNT_HW_CACHE_OP_MAX]
99 [PERF_COUNT_HW_CACHE_RESULT_MAX];
100
101static int
102armpmu_map_cache_event(u64 config)
103{
104 unsigned int cache_type, cache_op, cache_result, ret;
105
106 cache_type = (config >> 0) & 0xff;
107 if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
108 return -EINVAL;
109
110 cache_op = (config >> 8) & 0xff;
111 if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
112 return -EINVAL;
113
114 cache_result = (config >> 16) & 0xff;
115 if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
116 return -EINVAL;
117
118 ret = (int)armpmu_perf_cache_map[cache_type][cache_op][cache_result];
119
120 if (ret == CACHE_OP_UNSUPPORTED)
121 return -ENOENT;
122
123 return ret;
124}
125
126static int
127armpmu_event_set_period(struct perf_event *event,
128 struct hw_perf_event *hwc,
129 int idx)
130{
131 s64 left = atomic64_read(&hwc->period_left);
132 s64 period = hwc->sample_period;
133 int ret = 0;
134
135 if (unlikely(left <= -period)) {
136 left = period;
137 atomic64_set(&hwc->period_left, left);
138 hwc->last_period = period;
139 ret = 1;
140 }
141
142 if (unlikely(left <= 0)) {
143 left += period;
144 atomic64_set(&hwc->period_left, left);
145 hwc->last_period = period;
146 ret = 1;
147 }
148
149 if (left > (s64)armpmu->max_period)
150 left = armpmu->max_period;
151
152 atomic64_set(&hwc->prev_count, (u64)-left);
153
154 armpmu->write_counter(idx, (u64)(-left) & 0xffffffff);
155
156 perf_event_update_userpage(event);
157
158 return ret;
159}
160
161static u64
162armpmu_event_update(struct perf_event *event,
163 struct hw_perf_event *hwc,
164 int idx)
165{
166 int shift = 64 - 32;
167 s64 prev_raw_count, new_raw_count;
168 s64 delta;
169
170again:
171 prev_raw_count = atomic64_read(&hwc->prev_count);
172 new_raw_count = armpmu->read_counter(idx);
173
174 if (atomic64_cmpxchg(&hwc->prev_count, prev_raw_count,
175 new_raw_count) != prev_raw_count)
176 goto again;
177
178 delta = (new_raw_count << shift) - (prev_raw_count << shift);
179 delta >>= shift;
180
181 atomic64_add(delta, &event->count);
182 atomic64_sub(delta, &hwc->period_left);
183
184 return new_raw_count;
185}
186
187static void
188armpmu_disable(struct perf_event *event)
189{
190 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
191 struct hw_perf_event *hwc = &event->hw;
192 int idx = hwc->idx;
193
194 WARN_ON(idx < 0);
195
196 clear_bit(idx, cpuc->active_mask);
197 armpmu->disable(hwc, idx);
198
199 barrier();
200
201 armpmu_event_update(event, hwc, idx);
202 cpuc->events[idx] = NULL;
203 clear_bit(idx, cpuc->used_mask);
204
205 perf_event_update_userpage(event);
206}
207
208static void
209armpmu_read(struct perf_event *event)
210{
211 struct hw_perf_event *hwc = &event->hw;
212
213 /* Don't read disabled counters! */
214 if (hwc->idx < 0)
215 return;
216
217 armpmu_event_update(event, hwc, hwc->idx);
218}
219
220static void
221armpmu_unthrottle(struct perf_event *event)
222{
223 struct hw_perf_event *hwc = &event->hw;
224
225 /*
226 * Set the period again. Some counters can't be stopped, so when we
227 * were throttled we simply disabled the IRQ source and the counter
228 * may have been left counting. If we don't do this step then we may
229 * get an interrupt too soon or *way* too late if the overflow has
230 * happened since disabling.
231 */
232 armpmu_event_set_period(event, hwc, hwc->idx);
233 armpmu->enable(hwc, hwc->idx);
234}
235
236static int
237armpmu_enable(struct perf_event *event)
238{
239 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
240 struct hw_perf_event *hwc = &event->hw;
241 int idx;
242 int err = 0;
243
244 /* If we don't have a space for the counter then finish early. */
245 idx = armpmu->get_event_idx(cpuc, hwc);
246 if (idx < 0) {
247 err = idx;
248 goto out;
249 }
250
251 /*
252 * If there is an event in the counter we are going to use then make
253 * sure it is disabled.
254 */
255 event->hw.idx = idx;
256 armpmu->disable(hwc, idx);
257 cpuc->events[idx] = event;
258 set_bit(idx, cpuc->active_mask);
259
260 /* Set the period for the event. */
261 armpmu_event_set_period(event, hwc, idx);
262
263 /* Enable the event. */
264 armpmu->enable(hwc, idx);
265
266 /* Propagate our changes to the userspace mapping. */
267 perf_event_update_userpage(event);
268
269out:
270 return err;
271}
272
273static struct pmu pmu = {
274 .enable = armpmu_enable,
275 .disable = armpmu_disable,
276 .unthrottle = armpmu_unthrottle,
277 .read = armpmu_read,
278};
279
280static int
281validate_event(struct cpu_hw_events *cpuc,
282 struct perf_event *event)
283{
284 struct hw_perf_event fake_event = event->hw;
285
286 if (event->pmu && event->pmu != &pmu)
287 return 0;
288
289 return armpmu->get_event_idx(cpuc, &fake_event) >= 0;
290}
291
292static int
293validate_group(struct perf_event *event)
294{
295 struct perf_event *sibling, *leader = event->group_leader;
296 struct cpu_hw_events fake_pmu;
297
298 memset(&fake_pmu, 0, sizeof(fake_pmu));
299
300 if (!validate_event(&fake_pmu, leader))
301 return -ENOSPC;
302
303 list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
304 if (!validate_event(&fake_pmu, sibling))
305 return -ENOSPC;
306 }
307
308 if (!validate_event(&fake_pmu, event))
309 return -ENOSPC;
310
311 return 0;
312}
313
314static int
315armpmu_reserve_hardware(void)
316{
317 int i;
318 int err;
319
320 pmu_irqs = reserve_pmu();
321 if (IS_ERR(pmu_irqs)) {
322 pr_warning("unable to reserve pmu\n");
323 return PTR_ERR(pmu_irqs);
324 }
325
326 init_pmu();
327
328 if (pmu_irqs->num_irqs < 1) {
329 pr_err("no irqs for PMUs defined\n");
330 return -ENODEV;
331 }
332
333 for (i = 0; i < pmu_irqs->num_irqs; ++i) {
334 err = request_irq(pmu_irqs->irqs[i], armpmu->handle_irq,
335 IRQF_DISABLED, "armpmu", NULL);
336 if (err) {
337 pr_warning("unable to request IRQ%d for ARM "
338 "perf counters\n", pmu_irqs->irqs[i]);
339 break;
340 }
341 }
342
343 if (err) {
344 for (i = i - 1; i >= 0; --i)
345 free_irq(pmu_irqs->irqs[i], NULL);
346 release_pmu(pmu_irqs);
347 pmu_irqs = NULL;
348 }
349
350 return err;
351}
352
353static void
354armpmu_release_hardware(void)
355{
356 int i;
357
358 for (i = pmu_irqs->num_irqs - 1; i >= 0; --i)
359 free_irq(pmu_irqs->irqs[i], NULL);
360 armpmu->stop();
361
362 release_pmu(pmu_irqs);
363 pmu_irqs = NULL;
364}
365
366static atomic_t active_events = ATOMIC_INIT(0);
367static DEFINE_MUTEX(pmu_reserve_mutex);
368
369static void
370hw_perf_event_destroy(struct perf_event *event)
371{
372 if (atomic_dec_and_mutex_lock(&active_events, &pmu_reserve_mutex)) {
373 armpmu_release_hardware();
374 mutex_unlock(&pmu_reserve_mutex);
375 }
376}
377
378static int
379__hw_perf_event_init(struct perf_event *event)
380{
381 struct hw_perf_event *hwc = &event->hw;
382 int mapping, err;
383
384 /* Decode the generic type into an ARM event identifier. */
385 if (PERF_TYPE_HARDWARE == event->attr.type) {
386 mapping = armpmu->event_map(event->attr.config);
387 } else if (PERF_TYPE_HW_CACHE == event->attr.type) {
388 mapping = armpmu_map_cache_event(event->attr.config);
389 } else if (PERF_TYPE_RAW == event->attr.type) {
390 mapping = armpmu->raw_event(event->attr.config);
391 } else {
392 pr_debug("event type %x not supported\n", event->attr.type);
393 return -EOPNOTSUPP;
394 }
395
396 if (mapping < 0) {
397 pr_debug("event %x:%llx not supported\n", event->attr.type,
398 event->attr.config);
399 return mapping;
400 }
401
402 /*
403 * Check whether we need to exclude the counter from certain modes.
404 * The ARM performance counters are on all of the time so if someone
405 * has asked us for some excludes then we have to fail.
406 */
407 if (event->attr.exclude_kernel || event->attr.exclude_user ||
408 event->attr.exclude_hv || event->attr.exclude_idle) {
409 pr_debug("ARM performance counters do not support "
410 "mode exclusion\n");
411 return -EPERM;
412 }
413
414 /*
415 * We don't assign an index until we actually place the event onto
416 * hardware. Use -1 to signify that we haven't decided where to put it
417 * yet. For SMP systems, each core has it's own PMU so we can't do any
418 * clever allocation or constraints checking at this point.
419 */
420 hwc->idx = -1;
421
422 /*
423 * Store the event encoding into the config_base field. config and
424 * event_base are unused as the only 2 things we need to know are
425 * the event mapping and the counter to use. The counter to use is
426 * also the indx and the config_base is the event type.
427 */
428 hwc->config_base = (unsigned long)mapping;
429 hwc->config = 0;
430 hwc->event_base = 0;
431
432 if (!hwc->sample_period) {
433 hwc->sample_period = armpmu->max_period;
434 hwc->last_period = hwc->sample_period;
435 atomic64_set(&hwc->period_left, hwc->sample_period);
436 }
437
438 err = 0;
439 if (event->group_leader != event) {
440 err = validate_group(event);
441 if (err)
442 return -EINVAL;
443 }
444
445 return err;
446}
447
448const struct pmu *
449hw_perf_event_init(struct perf_event *event)
450{
451 int err = 0;
452
453 if (!armpmu)
454 return ERR_PTR(-ENODEV);
455
456 event->destroy = hw_perf_event_destroy;
457
458 if (!atomic_inc_not_zero(&active_events)) {
459 if (atomic_read(&active_events) > perf_max_events) {
460 atomic_dec(&active_events);
461 return ERR_PTR(-ENOSPC);
462 }
463
464 mutex_lock(&pmu_reserve_mutex);
465 if (atomic_read(&active_events) == 0) {
466 err = armpmu_reserve_hardware();
467 }
468
469 if (!err)
470 atomic_inc(&active_events);
471 mutex_unlock(&pmu_reserve_mutex);
472 }
473
474 if (err)
475 return ERR_PTR(err);
476
477 err = __hw_perf_event_init(event);
478 if (err)
479 hw_perf_event_destroy(event);
480
481 return err ? ERR_PTR(err) : &pmu;
482}
483
484void
485hw_perf_enable(void)
486{
487 /* Enable all of the perf events on hardware. */
488 int idx;
489 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
490
491 if (!armpmu)
492 return;
493
494 for (idx = 0; idx <= armpmu->num_events; ++idx) {
495 struct perf_event *event = cpuc->events[idx];
496
497 if (!event)
498 continue;
499
500 armpmu->enable(&event->hw, idx);
501 }
502
503 armpmu->start();
504}
505
506void
507hw_perf_disable(void)
508{
509 if (armpmu)
510 armpmu->stop();
511}
512
513/*
514 * ARMv6 Performance counter handling code.
515 *
516 * ARMv6 has 2 configurable performance counters and a single cycle counter.
517 * They all share a single reset bit but can be written to zero so we can use
518 * that for a reset.
519 *
520 * The counters can't be individually enabled or disabled so when we remove
521 * one event and replace it with another we could get spurious counts from the
522 * wrong event. However, we can take advantage of the fact that the
523 * performance counters can export events to the event bus, and the event bus
524 * itself can be monitored. This requires that we *don't* export the events to
525 * the event bus. The procedure for disabling a configurable counter is:
526 * - change the counter to count the ETMEXTOUT[0] signal (0x20). This
527 * effectively stops the counter from counting.
528 * - disable the counter's interrupt generation (each counter has it's
529 * own interrupt enable bit).
530 * Once stopped, the counter value can be written as 0 to reset.
531 *
532 * To enable a counter:
533 * - enable the counter's interrupt generation.
534 * - set the new event type.
535 *
536 * Note: the dedicated cycle counter only counts cycles and can't be
537 * enabled/disabled independently of the others. When we want to disable the
538 * cycle counter, we have to just disable the interrupt reporting and start
539 * ignoring that counter. When re-enabling, we have to reset the value and
540 * enable the interrupt.
541 */
542
543enum armv6_perf_types {
544 ARMV6_PERFCTR_ICACHE_MISS = 0x0,
545 ARMV6_PERFCTR_IBUF_STALL = 0x1,
546 ARMV6_PERFCTR_DDEP_STALL = 0x2,
547 ARMV6_PERFCTR_ITLB_MISS = 0x3,
548 ARMV6_PERFCTR_DTLB_MISS = 0x4,
549 ARMV6_PERFCTR_BR_EXEC = 0x5,
550 ARMV6_PERFCTR_BR_MISPREDICT = 0x6,
551 ARMV6_PERFCTR_INSTR_EXEC = 0x7,
552 ARMV6_PERFCTR_DCACHE_HIT = 0x9,
553 ARMV6_PERFCTR_DCACHE_ACCESS = 0xA,
554 ARMV6_PERFCTR_DCACHE_MISS = 0xB,
555 ARMV6_PERFCTR_DCACHE_WBACK = 0xC,
556 ARMV6_PERFCTR_SW_PC_CHANGE = 0xD,
557 ARMV6_PERFCTR_MAIN_TLB_MISS = 0xF,
558 ARMV6_PERFCTR_EXPL_D_ACCESS = 0x10,
559 ARMV6_PERFCTR_LSU_FULL_STALL = 0x11,
560 ARMV6_PERFCTR_WBUF_DRAINED = 0x12,
561 ARMV6_PERFCTR_CPU_CYCLES = 0xFF,
562 ARMV6_PERFCTR_NOP = 0x20,
563};
564
565enum armv6_counters {
566 ARMV6_CYCLE_COUNTER = 1,
567 ARMV6_COUNTER0,
568 ARMV6_COUNTER1,
569};
570
571/*
572 * The hardware events that we support. We do support cache operations but
573 * we have harvard caches and no way to combine instruction and data
574 * accesses/misses in hardware.
575 */
576static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = {
577 [PERF_COUNT_HW_CPU_CYCLES] = ARMV6_PERFCTR_CPU_CYCLES,
578 [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6_PERFCTR_INSTR_EXEC,
579 [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
580 [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
581 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6_PERFCTR_BR_EXEC,
582 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6_PERFCTR_BR_MISPREDICT,
583 [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
584};
585
586static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
587 [PERF_COUNT_HW_CACHE_OP_MAX]
588 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
589 [C(L1D)] = {
590 /*
591 * The performance counters don't differentiate between read
592 * and write accesses/misses so this isn't strictly correct,
593 * but it's the best we can do. Writes and reads get
594 * combined.
595 */
596 [C(OP_READ)] = {
597 [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
598 [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
599 },
600 [C(OP_WRITE)] = {
601 [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
602 [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
603 },
604 [C(OP_PREFETCH)] = {
605 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
606 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
607 },
608 },
609 [C(L1I)] = {
610 [C(OP_READ)] = {
611 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
612 [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
613 },
614 [C(OP_WRITE)] = {
615 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
616 [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
617 },
618 [C(OP_PREFETCH)] = {
619 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
620 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
621 },
622 },
623 [C(LL)] = {
624 [C(OP_READ)] = {
625 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
626 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
627 },
628 [C(OP_WRITE)] = {
629 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
630 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
631 },
632 [C(OP_PREFETCH)] = {
633 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
634 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
635 },
636 },
637 [C(DTLB)] = {
638 /*
639 * The ARM performance counters can count micro DTLB misses,
640 * micro ITLB misses and main TLB misses. There isn't an event
641 * for TLB misses, so use the micro misses here and if users
642 * want the main TLB misses they can use a raw counter.
643 */
644 [C(OP_READ)] = {
645 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
646 [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
647 },
648 [C(OP_WRITE)] = {
649 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
650 [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
651 },
652 [C(OP_PREFETCH)] = {
653 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
654 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
655 },
656 },
657 [C(ITLB)] = {
658 [C(OP_READ)] = {
659 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
660 [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
661 },
662 [C(OP_WRITE)] = {
663 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
664 [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
665 },
666 [C(OP_PREFETCH)] = {
667 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
668 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
669 },
670 },
671 [C(BPU)] = {
672 [C(OP_READ)] = {
673 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
674 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
675 },
676 [C(OP_WRITE)] = {
677 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
678 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
679 },
680 [C(OP_PREFETCH)] = {
681 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
682 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
683 },
684 },
685};
686
687enum armv6mpcore_perf_types {
688 ARMV6MPCORE_PERFCTR_ICACHE_MISS = 0x0,
689 ARMV6MPCORE_PERFCTR_IBUF_STALL = 0x1,
690 ARMV6MPCORE_PERFCTR_DDEP_STALL = 0x2,
691 ARMV6MPCORE_PERFCTR_ITLB_MISS = 0x3,
692 ARMV6MPCORE_PERFCTR_DTLB_MISS = 0x4,
693 ARMV6MPCORE_PERFCTR_BR_EXEC = 0x5,
694 ARMV6MPCORE_PERFCTR_BR_NOTPREDICT = 0x6,
695 ARMV6MPCORE_PERFCTR_BR_MISPREDICT = 0x7,
696 ARMV6MPCORE_PERFCTR_INSTR_EXEC = 0x8,
697 ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
698 ARMV6MPCORE_PERFCTR_DCACHE_RDMISS = 0xB,
699 ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
700 ARMV6MPCORE_PERFCTR_DCACHE_WRMISS = 0xD,
701 ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
702 ARMV6MPCORE_PERFCTR_SW_PC_CHANGE = 0xF,
703 ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS = 0x10,
704 ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
705 ARMV6MPCORE_PERFCTR_LSU_FULL_STALL = 0x12,
706 ARMV6MPCORE_PERFCTR_WBUF_DRAINED = 0x13,
707 ARMV6MPCORE_PERFCTR_CPU_CYCLES = 0xFF,
708};
709
710/*
711 * The hardware events that we support. We do support cache operations but
712 * we have harvard caches and no way to combine instruction and data
713 * accesses/misses in hardware.
714 */
715static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
716 [PERF_COUNT_HW_CPU_CYCLES] = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
717 [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
718 [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
719 [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
720 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_BR_EXEC,
721 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
722 [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
723};
724
725static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
726 [PERF_COUNT_HW_CACHE_OP_MAX]
727 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
728 [C(L1D)] = {
729 [C(OP_READ)] = {
730 [C(RESULT_ACCESS)] =
731 ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
732 [C(RESULT_MISS)] =
733 ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
734 },
735 [C(OP_WRITE)] = {
736 [C(RESULT_ACCESS)] =
737 ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
738 [C(RESULT_MISS)] =
739 ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
740 },
741 [C(OP_PREFETCH)] = {
742 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
743 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
744 },
745 },
746 [C(L1I)] = {
747 [C(OP_READ)] = {
748 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
749 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
750 },
751 [C(OP_WRITE)] = {
752 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
753 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
754 },
755 [C(OP_PREFETCH)] = {
756 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
757 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
758 },
759 },
760 [C(LL)] = {
761 [C(OP_READ)] = {
762 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
763 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
764 },
765 [C(OP_WRITE)] = {
766 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
767 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
768 },
769 [C(OP_PREFETCH)] = {
770 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
771 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
772 },
773 },
774 [C(DTLB)] = {
775 /*
776 * The ARM performance counters can count micro DTLB misses,
777 * micro ITLB misses and main TLB misses. There isn't an event
778 * for TLB misses, so use the micro misses here and if users
779 * want the main TLB misses they can use a raw counter.
780 */
781 [C(OP_READ)] = {
782 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
783 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
784 },
785 [C(OP_WRITE)] = {
786 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
787 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
788 },
789 [C(OP_PREFETCH)] = {
790 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
791 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
792 },
793 },
794 [C(ITLB)] = {
795 [C(OP_READ)] = {
796 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
797 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
798 },
799 [C(OP_WRITE)] = {
800 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
801 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
802 },
803 [C(OP_PREFETCH)] = {
804 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
805 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
806 },
807 },
808 [C(BPU)] = {
809 [C(OP_READ)] = {
810 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
811 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
812 },
813 [C(OP_WRITE)] = {
814 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
815 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
816 },
817 [C(OP_PREFETCH)] = {
818 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
819 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
820 },
821 },
822};
823
824static inline unsigned long
825armv6_pmcr_read(void)
826{
827 u32 val;
828 asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r"(val));
829 return val;
830}
831
832static inline void
833armv6_pmcr_write(unsigned long val)
834{
835 asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r"(val));
836}
837
838#define ARMV6_PMCR_ENABLE (1 << 0)
839#define ARMV6_PMCR_CTR01_RESET (1 << 1)
840#define ARMV6_PMCR_CCOUNT_RESET (1 << 2)
841#define ARMV6_PMCR_CCOUNT_DIV (1 << 3)
842#define ARMV6_PMCR_COUNT0_IEN (1 << 4)
843#define ARMV6_PMCR_COUNT1_IEN (1 << 5)
844#define ARMV6_PMCR_CCOUNT_IEN (1 << 6)
845#define ARMV6_PMCR_COUNT0_OVERFLOW (1 << 8)
846#define ARMV6_PMCR_COUNT1_OVERFLOW (1 << 9)
847#define ARMV6_PMCR_CCOUNT_OVERFLOW (1 << 10)
848#define ARMV6_PMCR_EVT_COUNT0_SHIFT 20
849#define ARMV6_PMCR_EVT_COUNT0_MASK (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
850#define ARMV6_PMCR_EVT_COUNT1_SHIFT 12
851#define ARMV6_PMCR_EVT_COUNT1_MASK (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
852
853#define ARMV6_PMCR_OVERFLOWED_MASK \
854 (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
855 ARMV6_PMCR_CCOUNT_OVERFLOW)
856
857static inline int
858armv6_pmcr_has_overflowed(unsigned long pmcr)
859{
860 return (pmcr & ARMV6_PMCR_OVERFLOWED_MASK);
861}
862
863static inline int
864armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
865 enum armv6_counters counter)
866{
867 int ret = 0;
868
869 if (ARMV6_CYCLE_COUNTER == counter)
870 ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
871 else if (ARMV6_COUNTER0 == counter)
872 ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
873 else if (ARMV6_COUNTER1 == counter)
874 ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
875 else
876 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
877
878 return ret;
879}
880
881static inline u32
882armv6pmu_read_counter(int counter)
883{
884 unsigned long value = 0;
885
886 if (ARMV6_CYCLE_COUNTER == counter)
887 asm volatile("mrc p15, 0, %0, c15, c12, 1" : "=r"(value));
888 else if (ARMV6_COUNTER0 == counter)
889 asm volatile("mrc p15, 0, %0, c15, c12, 2" : "=r"(value));
890 else if (ARMV6_COUNTER1 == counter)
891 asm volatile("mrc p15, 0, %0, c15, c12, 3" : "=r"(value));
892 else
893 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
894
895 return value;
896}
897
898static inline void
899armv6pmu_write_counter(int counter,
900 u32 value)
901{
902 if (ARMV6_CYCLE_COUNTER == counter)
903 asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r"(value));
904 else if (ARMV6_COUNTER0 == counter)
905 asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r"(value));
906 else if (ARMV6_COUNTER1 == counter)
907 asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r"(value));
908 else
909 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
910}
911
912void
913armv6pmu_enable_event(struct hw_perf_event *hwc,
914 int idx)
915{
916 unsigned long val, mask, evt, flags;
917
918 if (ARMV6_CYCLE_COUNTER == idx) {
919 mask = 0;
920 evt = ARMV6_PMCR_CCOUNT_IEN;
921 } else if (ARMV6_COUNTER0 == idx) {
922 mask = ARMV6_PMCR_EVT_COUNT0_MASK;
923 evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
924 ARMV6_PMCR_COUNT0_IEN;
925 } else if (ARMV6_COUNTER1 == idx) {
926 mask = ARMV6_PMCR_EVT_COUNT1_MASK;
927 evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
928 ARMV6_PMCR_COUNT1_IEN;
929 } else {
930 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
931 return;
932 }
933
934 /*
935 * Mask out the current event and set the counter to count the event
936 * that we're interested in.
937 */
938 spin_lock_irqsave(&pmu_lock, flags);
939 val = armv6_pmcr_read();
940 val &= ~mask;
941 val |= evt;
942 armv6_pmcr_write(val);
943 spin_unlock_irqrestore(&pmu_lock, flags);
944}
945
946static irqreturn_t
947armv6pmu_handle_irq(int irq_num,
948 void *dev)
949{
950 unsigned long pmcr = armv6_pmcr_read();
951 struct perf_sample_data data;
952 struct cpu_hw_events *cpuc;
953 struct pt_regs *regs;
954 int idx;
955
956 if (!armv6_pmcr_has_overflowed(pmcr))
957 return IRQ_NONE;
958
959 regs = get_irq_regs();
960
961 /*
962 * The interrupts are cleared by writing the overflow flags back to
963 * the control register. All of the other bits don't have any effect
964 * if they are rewritten, so write the whole value back.
965 */
966 armv6_pmcr_write(pmcr);
967
968 data.addr = 0;
969
970 cpuc = &__get_cpu_var(cpu_hw_events);
971 for (idx = 0; idx <= armpmu->num_events; ++idx) {
972 struct perf_event *event = cpuc->events[idx];
973 struct hw_perf_event *hwc;
974
975 if (!test_bit(idx, cpuc->active_mask))
976 continue;
977
978 /*
979 * We have a single interrupt for all counters. Check that
980 * each counter has overflowed before we process it.
981 */
982 if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
983 continue;
984
985 hwc = &event->hw;
986 armpmu_event_update(event, hwc, idx);
987 data.period = event->hw.last_period;
988 if (!armpmu_event_set_period(event, hwc, idx))
989 continue;
990
991 if (perf_event_overflow(event, 0, &data, regs))
992 armpmu->disable(hwc, idx);
993 }
994
995 /*
996 * Handle the pending perf events.
997 *
998 * Note: this call *must* be run with interrupts enabled. For
999 * platforms that can have the PMU interrupts raised as a PMI, this
1000 * will not work.
1001 */
1002 perf_event_do_pending();
1003
1004 return IRQ_HANDLED;
1005}
1006
1007static void
1008armv6pmu_start(void)
1009{
1010 unsigned long flags, val;
1011
1012 spin_lock_irqsave(&pmu_lock, flags);
1013 val = armv6_pmcr_read();
1014 val |= ARMV6_PMCR_ENABLE;
1015 armv6_pmcr_write(val);
1016 spin_unlock_irqrestore(&pmu_lock, flags);
1017}
1018
1019void
1020armv6pmu_stop(void)
1021{
1022 unsigned long flags, val;
1023
1024 spin_lock_irqsave(&pmu_lock, flags);
1025 val = armv6_pmcr_read();
1026 val &= ~ARMV6_PMCR_ENABLE;
1027 armv6_pmcr_write(val);
1028 spin_unlock_irqrestore(&pmu_lock, flags);
1029}
1030
1031static inline int
1032armv6pmu_event_map(int config)
1033{
1034 int mapping = armv6_perf_map[config];
1035 if (HW_OP_UNSUPPORTED == mapping)
1036 mapping = -EOPNOTSUPP;
1037 return mapping;
1038}
1039
1040static inline int
1041armv6mpcore_pmu_event_map(int config)
1042{
1043 int mapping = armv6mpcore_perf_map[config];
1044 if (HW_OP_UNSUPPORTED == mapping)
1045 mapping = -EOPNOTSUPP;
1046 return mapping;
1047}
1048
1049static u64
1050armv6pmu_raw_event(u64 config)
1051{
1052 return config & 0xff;
1053}
1054
1055static int
1056armv6pmu_get_event_idx(struct cpu_hw_events *cpuc,
1057 struct hw_perf_event *event)
1058{
1059 /* Always place a cycle counter into the cycle counter. */
1060 if (ARMV6_PERFCTR_CPU_CYCLES == event->config_base) {
1061 if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
1062 return -EAGAIN;
1063
1064 return ARMV6_CYCLE_COUNTER;
1065 } else {
1066 /*
1067 * For anything other than a cycle counter, try and use
1068 * counter0 and counter1.
1069 */
1070 if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask)) {
1071 return ARMV6_COUNTER1;
1072 }
1073
1074 if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask)) {
1075 return ARMV6_COUNTER0;
1076 }
1077
1078 /* The counters are all in use. */
1079 return -EAGAIN;
1080 }
1081}
1082
1083static void
1084armv6pmu_disable_event(struct hw_perf_event *hwc,
1085 int idx)
1086{
1087 unsigned long val, mask, evt, flags;
1088
1089 if (ARMV6_CYCLE_COUNTER == idx) {
1090 mask = ARMV6_PMCR_CCOUNT_IEN;
1091 evt = 0;
1092 } else if (ARMV6_COUNTER0 == idx) {
1093 mask = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
1094 evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
1095 } else if (ARMV6_COUNTER1 == idx) {
1096 mask = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
1097 evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
1098 } else {
1099 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
1100 return;
1101 }
1102
1103 /*
1104 * Mask out the current event and set the counter to count the number
1105 * of ETM bus signal assertion cycles. The external reporting should
1106 * be disabled and so this should never increment.
1107 */
1108 spin_lock_irqsave(&pmu_lock, flags);
1109 val = armv6_pmcr_read();
1110 val &= ~mask;
1111 val |= evt;
1112 armv6_pmcr_write(val);
1113 spin_unlock_irqrestore(&pmu_lock, flags);
1114}
1115
1116static void
1117armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc,
1118 int idx)
1119{
1120 unsigned long val, mask, flags, evt = 0;
1121
1122 if (ARMV6_CYCLE_COUNTER == idx) {
1123 mask = ARMV6_PMCR_CCOUNT_IEN;
1124 } else if (ARMV6_COUNTER0 == idx) {
1125 mask = ARMV6_PMCR_COUNT0_IEN;
1126 } else if (ARMV6_COUNTER1 == idx) {
1127 mask = ARMV6_PMCR_COUNT1_IEN;
1128 } else {
1129 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
1130 return;
1131 }
1132
1133 /*
1134 * Unlike UP ARMv6, we don't have a way of stopping the counters. We
1135 * simply disable the interrupt reporting.
1136 */
1137 spin_lock_irqsave(&pmu_lock, flags);
1138 val = armv6_pmcr_read();
1139 val &= ~mask;
1140 val |= evt;
1141 armv6_pmcr_write(val);
1142 spin_unlock_irqrestore(&pmu_lock, flags);
1143}
1144
1145static const struct arm_pmu armv6pmu = {
1146 .name = "v6",
1147 .handle_irq = armv6pmu_handle_irq,
1148 .enable = armv6pmu_enable_event,
1149 .disable = armv6pmu_disable_event,
1150 .event_map = armv6pmu_event_map,
1151 .raw_event = armv6pmu_raw_event,
1152 .read_counter = armv6pmu_read_counter,
1153 .write_counter = armv6pmu_write_counter,
1154 .get_event_idx = armv6pmu_get_event_idx,
1155 .start = armv6pmu_start,
1156 .stop = armv6pmu_stop,
1157 .num_events = 3,
1158 .max_period = (1LLU << 32) - 1,
1159};
1160
1161/*
1162 * ARMv6mpcore is almost identical to single core ARMv6 with the exception
1163 * that some of the events have different enumerations and that there is no
1164 * *hack* to stop the programmable counters. To stop the counters we simply
1165 * disable the interrupt reporting and update the event. When unthrottling we
1166 * reset the period and enable the interrupt reporting.
1167 */
1168static const struct arm_pmu armv6mpcore_pmu = {
1169 .name = "v6mpcore",
1170 .handle_irq = armv6pmu_handle_irq,
1171 .enable = armv6pmu_enable_event,
1172 .disable = armv6mpcore_pmu_disable_event,
1173 .event_map = armv6mpcore_pmu_event_map,
1174 .raw_event = armv6pmu_raw_event,
1175 .read_counter = armv6pmu_read_counter,
1176 .write_counter = armv6pmu_write_counter,
1177 .get_event_idx = armv6pmu_get_event_idx,
1178 .start = armv6pmu_start,
1179 .stop = armv6pmu_stop,
1180 .num_events = 3,
1181 .max_period = (1LLU << 32) - 1,
1182};
1183
1184/*
1185 * ARMv7 Cortex-A8 and Cortex-A9 Performance Events handling code.
1186 *
1187 * Copied from ARMv6 code, with the low level code inspired
1188 * by the ARMv7 Oprofile code.
1189 *
1190 * Cortex-A8 has up to 4 configurable performance counters and
1191 * a single cycle counter.
1192 * Cortex-A9 has up to 31 configurable performance counters and
1193 * a single cycle counter.
1194 *
1195 * All counters can be enabled/disabled and IRQ masked separately. The cycle
1196 * counter and all 4 performance counters together can be reset separately.
1197 */
1198
1199#define ARMV7_PMU_CORTEX_A8_NAME "ARMv7 Cortex-A8"
1200
1201#define ARMV7_PMU_CORTEX_A9_NAME "ARMv7 Cortex-A9"
1202
1203/* Common ARMv7 event types */
1204enum armv7_perf_types {
1205 ARMV7_PERFCTR_PMNC_SW_INCR = 0x00,
1206 ARMV7_PERFCTR_IFETCH_MISS = 0x01,
1207 ARMV7_PERFCTR_ITLB_MISS = 0x02,
1208 ARMV7_PERFCTR_DCACHE_REFILL = 0x03,
1209 ARMV7_PERFCTR_DCACHE_ACCESS = 0x04,
1210 ARMV7_PERFCTR_DTLB_REFILL = 0x05,
1211 ARMV7_PERFCTR_DREAD = 0x06,
1212 ARMV7_PERFCTR_DWRITE = 0x07,
1213
1214 ARMV7_PERFCTR_EXC_TAKEN = 0x09,
1215 ARMV7_PERFCTR_EXC_EXECUTED = 0x0A,
1216 ARMV7_PERFCTR_CID_WRITE = 0x0B,
1217 /* ARMV7_PERFCTR_PC_WRITE is equivalent to HW_BRANCH_INSTRUCTIONS.
1218 * It counts:
1219 * - all branch instructions,
1220 * - instructions that explicitly write the PC,
1221 * - exception generating instructions.
1222 */
1223 ARMV7_PERFCTR_PC_WRITE = 0x0C,
1224 ARMV7_PERFCTR_PC_IMM_BRANCH = 0x0D,
1225 ARMV7_PERFCTR_UNALIGNED_ACCESS = 0x0F,
1226 ARMV7_PERFCTR_PC_BRANCH_MIS_PRED = 0x10,
1227 ARMV7_PERFCTR_CLOCK_CYCLES = 0x11,
1228
1229 ARMV7_PERFCTR_PC_BRANCH_MIS_USED = 0x12,
1230
1231 ARMV7_PERFCTR_CPU_CYCLES = 0xFF
1232};
1233
1234/* ARMv7 Cortex-A8 specific event types */
1235enum armv7_a8_perf_types {
1236 ARMV7_PERFCTR_INSTR_EXECUTED = 0x08,
1237
1238 ARMV7_PERFCTR_PC_PROC_RETURN = 0x0E,
1239
1240 ARMV7_PERFCTR_WRITE_BUFFER_FULL = 0x40,
1241 ARMV7_PERFCTR_L2_STORE_MERGED = 0x41,
1242 ARMV7_PERFCTR_L2_STORE_BUFF = 0x42,
1243 ARMV7_PERFCTR_L2_ACCESS = 0x43,
1244 ARMV7_PERFCTR_L2_CACH_MISS = 0x44,
1245 ARMV7_PERFCTR_AXI_READ_CYCLES = 0x45,
1246 ARMV7_PERFCTR_AXI_WRITE_CYCLES = 0x46,
1247 ARMV7_PERFCTR_MEMORY_REPLAY = 0x47,
1248 ARMV7_PERFCTR_UNALIGNED_ACCESS_REPLAY = 0x48,
1249 ARMV7_PERFCTR_L1_DATA_MISS = 0x49,
1250 ARMV7_PERFCTR_L1_INST_MISS = 0x4A,
1251 ARMV7_PERFCTR_L1_DATA_COLORING = 0x4B,
1252 ARMV7_PERFCTR_L1_NEON_DATA = 0x4C,
1253 ARMV7_PERFCTR_L1_NEON_CACH_DATA = 0x4D,
1254 ARMV7_PERFCTR_L2_NEON = 0x4E,
1255 ARMV7_PERFCTR_L2_NEON_HIT = 0x4F,
1256 ARMV7_PERFCTR_L1_INST = 0x50,
1257 ARMV7_PERFCTR_PC_RETURN_MIS_PRED = 0x51,
1258 ARMV7_PERFCTR_PC_BRANCH_FAILED = 0x52,
1259 ARMV7_PERFCTR_PC_BRANCH_TAKEN = 0x53,
1260 ARMV7_PERFCTR_PC_BRANCH_EXECUTED = 0x54,
1261 ARMV7_PERFCTR_OP_EXECUTED = 0x55,
1262 ARMV7_PERFCTR_CYCLES_INST_STALL = 0x56,
1263 ARMV7_PERFCTR_CYCLES_INST = 0x57,
1264 ARMV7_PERFCTR_CYCLES_NEON_DATA_STALL = 0x58,
1265 ARMV7_PERFCTR_CYCLES_NEON_INST_STALL = 0x59,
1266 ARMV7_PERFCTR_NEON_CYCLES = 0x5A,
1267
1268 ARMV7_PERFCTR_PMU0_EVENTS = 0x70,
1269 ARMV7_PERFCTR_PMU1_EVENTS = 0x71,
1270 ARMV7_PERFCTR_PMU_EVENTS = 0x72,
1271};
1272
1273/* ARMv7 Cortex-A9 specific event types */
1274enum armv7_a9_perf_types {
1275 ARMV7_PERFCTR_JAVA_HW_BYTECODE_EXEC = 0x40,
1276 ARMV7_PERFCTR_JAVA_SW_BYTECODE_EXEC = 0x41,
1277 ARMV7_PERFCTR_JAZELLE_BRANCH_EXEC = 0x42,
1278
1279 ARMV7_PERFCTR_COHERENT_LINE_MISS = 0x50,
1280 ARMV7_PERFCTR_COHERENT_LINE_HIT = 0x51,
1281
1282 ARMV7_PERFCTR_ICACHE_DEP_STALL_CYCLES = 0x60,
1283 ARMV7_PERFCTR_DCACHE_DEP_STALL_CYCLES = 0x61,
1284 ARMV7_PERFCTR_TLB_MISS_DEP_STALL_CYCLES = 0x62,
1285 ARMV7_PERFCTR_STREX_EXECUTED_PASSED = 0x63,
1286 ARMV7_PERFCTR_STREX_EXECUTED_FAILED = 0x64,
1287 ARMV7_PERFCTR_DATA_EVICTION = 0x65,
1288 ARMV7_PERFCTR_ISSUE_STAGE_NO_INST = 0x66,
1289 ARMV7_PERFCTR_ISSUE_STAGE_EMPTY = 0x67,
1290 ARMV7_PERFCTR_INST_OUT_OF_RENAME_STAGE = 0x68,
1291
1292 ARMV7_PERFCTR_PREDICTABLE_FUNCT_RETURNS = 0x6E,
1293
1294 ARMV7_PERFCTR_MAIN_UNIT_EXECUTED_INST = 0x70,
1295 ARMV7_PERFCTR_SECOND_UNIT_EXECUTED_INST = 0x71,
1296 ARMV7_PERFCTR_LD_ST_UNIT_EXECUTED_INST = 0x72,
1297 ARMV7_PERFCTR_FP_EXECUTED_INST = 0x73,
1298 ARMV7_PERFCTR_NEON_EXECUTED_INST = 0x74,
1299
1300 ARMV7_PERFCTR_PLD_FULL_DEP_STALL_CYCLES = 0x80,
1301 ARMV7_PERFCTR_DATA_WR_DEP_STALL_CYCLES = 0x81,
1302 ARMV7_PERFCTR_ITLB_MISS_DEP_STALL_CYCLES = 0x82,
1303 ARMV7_PERFCTR_DTLB_MISS_DEP_STALL_CYCLES = 0x83,
1304 ARMV7_PERFCTR_MICRO_ITLB_MISS_DEP_STALL_CYCLES = 0x84,
1305 ARMV7_PERFCTR_MICRO_DTLB_MISS_DEP_STALL_CYCLES = 0x85,
1306 ARMV7_PERFCTR_DMB_DEP_STALL_CYCLES = 0x86,
1307
1308 ARMV7_PERFCTR_INTGR_CLK_ENABLED_CYCLES = 0x8A,
1309 ARMV7_PERFCTR_DATA_ENGINE_CLK_EN_CYCLES = 0x8B,
1310
1311 ARMV7_PERFCTR_ISB_INST = 0x90,
1312 ARMV7_PERFCTR_DSB_INST = 0x91,
1313 ARMV7_PERFCTR_DMB_INST = 0x92,
1314 ARMV7_PERFCTR_EXT_INTERRUPTS = 0x93,
1315
1316 ARMV7_PERFCTR_PLE_CACHE_LINE_RQST_COMPLETED = 0xA0,
1317 ARMV7_PERFCTR_PLE_CACHE_LINE_RQST_SKIPPED = 0xA1,
1318 ARMV7_PERFCTR_PLE_FIFO_FLUSH = 0xA2,
1319 ARMV7_PERFCTR_PLE_RQST_COMPLETED = 0xA3,
1320 ARMV7_PERFCTR_PLE_FIFO_OVERFLOW = 0xA4,
1321 ARMV7_PERFCTR_PLE_RQST_PROG = 0xA5
1322};
1323
1324/*
1325 * Cortex-A8 HW events mapping
1326 *
1327 * The hardware events that we support. We do support cache operations but
1328 * we have harvard caches and no way to combine instruction and data
1329 * accesses/misses in hardware.
1330 */
1331static const unsigned armv7_a8_perf_map[PERF_COUNT_HW_MAX] = {
1332 [PERF_COUNT_HW_CPU_CYCLES] = ARMV7_PERFCTR_CPU_CYCLES,
1333 [PERF_COUNT_HW_INSTRUCTIONS] = ARMV7_PERFCTR_INSTR_EXECUTED,
1334 [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
1335 [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
1336 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE,
1337 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
1338 [PERF_COUNT_HW_BUS_CYCLES] = ARMV7_PERFCTR_CLOCK_CYCLES,
1339};
1340
1341static const unsigned armv7_a8_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
1342 [PERF_COUNT_HW_CACHE_OP_MAX]
1343 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
1344 [C(L1D)] = {
1345 /*
1346 * The performance counters don't differentiate between read
1347 * and write accesses/misses so this isn't strictly correct,
1348 * but it's the best we can do. Writes and reads get
1349 * combined.
1350 */
1351 [C(OP_READ)] = {
1352 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS,
1353 [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
1354 },
1355 [C(OP_WRITE)] = {
1356 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS,
1357 [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
1358 },
1359 [C(OP_PREFETCH)] = {
1360 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1361 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1362 },
1363 },
1364 [C(L1I)] = {
1365 [C(OP_READ)] = {
1366 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L1_INST,
1367 [C(RESULT_MISS)] = ARMV7_PERFCTR_L1_INST_MISS,
1368 },
1369 [C(OP_WRITE)] = {
1370 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L1_INST,
1371 [C(RESULT_MISS)] = ARMV7_PERFCTR_L1_INST_MISS,
1372 },
1373 [C(OP_PREFETCH)] = {
1374 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1375 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1376 },
1377 },
1378 [C(LL)] = {
1379 [C(OP_READ)] = {
1380 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L2_ACCESS,
1381 [C(RESULT_MISS)] = ARMV7_PERFCTR_L2_CACH_MISS,
1382 },
1383 [C(OP_WRITE)] = {
1384 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L2_ACCESS,
1385 [C(RESULT_MISS)] = ARMV7_PERFCTR_L2_CACH_MISS,
1386 },
1387 [C(OP_PREFETCH)] = {
1388 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1389 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1390 },
1391 },
1392 [C(DTLB)] = {
1393 /*
1394 * Only ITLB misses and DTLB refills are supported.
1395 * If users want the DTLB refills misses a raw counter
1396 * must be used.
1397 */
1398 [C(OP_READ)] = {
1399 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1400 [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
1401 },
1402 [C(OP_WRITE)] = {
1403 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1404 [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
1405 },
1406 [C(OP_PREFETCH)] = {
1407 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1408 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1409 },
1410 },
1411 [C(ITLB)] = {
1412 [C(OP_READ)] = {
1413 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1414 [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
1415 },
1416 [C(OP_WRITE)] = {
1417 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1418 [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
1419 },
1420 [C(OP_PREFETCH)] = {
1421 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1422 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1423 },
1424 },
1425 [C(BPU)] = {
1426 [C(OP_READ)] = {
1427 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
1428 [C(RESULT_MISS)]
1429 = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
1430 },
1431 [C(OP_WRITE)] = {
1432 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
1433 [C(RESULT_MISS)]
1434 = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
1435 },
1436 [C(OP_PREFETCH)] = {
1437 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1438 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1439 },
1440 },
1441};
1442
1443/*
1444 * Cortex-A9 HW events mapping
1445 */
1446static const unsigned armv7_a9_perf_map[PERF_COUNT_HW_MAX] = {
1447 [PERF_COUNT_HW_CPU_CYCLES] = ARMV7_PERFCTR_CPU_CYCLES,
1448 [PERF_COUNT_HW_INSTRUCTIONS] =
1449 ARMV7_PERFCTR_INST_OUT_OF_RENAME_STAGE,
1450 [PERF_COUNT_HW_CACHE_REFERENCES] = ARMV7_PERFCTR_COHERENT_LINE_HIT,
1451 [PERF_COUNT_HW_CACHE_MISSES] = ARMV7_PERFCTR_COHERENT_LINE_MISS,
1452 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE,
1453 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
1454 [PERF_COUNT_HW_BUS_CYCLES] = ARMV7_PERFCTR_CLOCK_CYCLES,
1455};
1456
1457static const unsigned armv7_a9_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
1458 [PERF_COUNT_HW_CACHE_OP_MAX]
1459 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
1460 [C(L1D)] = {
1461 /*
1462 * The performance counters don't differentiate between read
1463 * and write accesses/misses so this isn't strictly correct,
1464 * but it's the best we can do. Writes and reads get
1465 * combined.
1466 */
1467 [C(OP_READ)] = {
1468 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS,
1469 [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
1470 },
1471 [C(OP_WRITE)] = {
1472 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS,
1473 [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL,
1474 },
1475 [C(OP_PREFETCH)] = {
1476 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1477 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1478 },
1479 },
1480 [C(L1I)] = {
1481 [C(OP_READ)] = {
1482 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1483 [C(RESULT_MISS)] = ARMV7_PERFCTR_IFETCH_MISS,
1484 },
1485 [C(OP_WRITE)] = {
1486 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1487 [C(RESULT_MISS)] = ARMV7_PERFCTR_IFETCH_MISS,
1488 },
1489 [C(OP_PREFETCH)] = {
1490 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1491 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1492 },
1493 },
1494 [C(LL)] = {
1495 [C(OP_READ)] = {
1496 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1497 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1498 },
1499 [C(OP_WRITE)] = {
1500 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1501 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1502 },
1503 [C(OP_PREFETCH)] = {
1504 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1505 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1506 },
1507 },
1508 [C(DTLB)] = {
1509 /*
1510 * Only ITLB misses and DTLB refills are supported.
1511 * If users want the DTLB refills misses a raw counter
1512 * must be used.
1513 */
1514 [C(OP_READ)] = {
1515 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1516 [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
1517 },
1518 [C(OP_WRITE)] = {
1519 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1520 [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL,
1521 },
1522 [C(OP_PREFETCH)] = {
1523 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1524 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1525 },
1526 },
1527 [C(ITLB)] = {
1528 [C(OP_READ)] = {
1529 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1530 [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
1531 },
1532 [C(OP_WRITE)] = {
1533 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1534 [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS,
1535 },
1536 [C(OP_PREFETCH)] = {
1537 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1538 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1539 },
1540 },
1541 [C(BPU)] = {
1542 [C(OP_READ)] = {
1543 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
1544 [C(RESULT_MISS)]
1545 = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
1546 },
1547 [C(OP_WRITE)] = {
1548 [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE,
1549 [C(RESULT_MISS)]
1550 = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
1551 },
1552 [C(OP_PREFETCH)] = {
1553 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
1554 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
1555 },
1556 },
1557};
1558
1559/*
1560 * Perf Events counters
1561 */
1562enum armv7_counters {
1563 ARMV7_CYCLE_COUNTER = 1, /* Cycle counter */
1564 ARMV7_COUNTER0 = 2, /* First event counter */
1565};
1566
1567/*
1568 * The cycle counter is ARMV7_CYCLE_COUNTER.
1569 * The first event counter is ARMV7_COUNTER0.
1570 * The last event counter is (ARMV7_COUNTER0 + armpmu->num_events - 1).
1571 */
1572#define ARMV7_COUNTER_LAST (ARMV7_COUNTER0 + armpmu->num_events - 1)
1573
1574/*
1575 * ARMv7 low level PMNC access
1576 */
1577
1578/*
1579 * Per-CPU PMNC: config reg
1580 */
1581#define ARMV7_PMNC_E (1 << 0) /* Enable all counters */
1582#define ARMV7_PMNC_P (1 << 1) /* Reset all counters */
1583#define ARMV7_PMNC_C (1 << 2) /* Cycle counter reset */
1584#define ARMV7_PMNC_D (1 << 3) /* CCNT counts every 64th cpu cycle */
1585#define ARMV7_PMNC_X (1 << 4) /* Export to ETM */
1586#define ARMV7_PMNC_DP (1 << 5) /* Disable CCNT if non-invasive debug*/
1587#define ARMV7_PMNC_N_SHIFT 11 /* Number of counters supported */
1588#define ARMV7_PMNC_N_MASK 0x1f
1589#define ARMV7_PMNC_MASK 0x3f /* Mask for writable bits */
1590
1591/*
1592 * Available counters
1593 */
1594#define ARMV7_CNT0 0 /* First event counter */
1595#define ARMV7_CCNT 31 /* Cycle counter */
1596
1597/* Perf Event to low level counters mapping */
1598#define ARMV7_EVENT_CNT_TO_CNTx (ARMV7_COUNTER0 - ARMV7_CNT0)
1599
1600/*
1601 * CNTENS: counters enable reg
1602 */
1603#define ARMV7_CNTENS_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
1604#define ARMV7_CNTENS_C (1 << ARMV7_CCNT)
1605
1606/*
1607 * CNTENC: counters disable reg
1608 */
1609#define ARMV7_CNTENC_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
1610#define ARMV7_CNTENC_C (1 << ARMV7_CCNT)
1611
1612/*
1613 * INTENS: counters overflow interrupt enable reg
1614 */
1615#define ARMV7_INTENS_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
1616#define ARMV7_INTENS_C (1 << ARMV7_CCNT)
1617
1618/*
1619 * INTENC: counters overflow interrupt disable reg
1620 */
1621#define ARMV7_INTENC_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
1622#define ARMV7_INTENC_C (1 << ARMV7_CCNT)
1623
1624/*
1625 * EVTSEL: Event selection reg
1626 */
1627#define ARMV7_EVTSEL_MASK 0x7f /* Mask for writable bits */
1628
1629/*
1630 * SELECT: Counter selection reg
1631 */
1632#define ARMV7_SELECT_MASK 0x1f /* Mask for writable bits */
1633
1634/*
1635 * FLAG: counters overflow flag status reg
1636 */
1637#define ARMV7_FLAG_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx))
1638#define ARMV7_FLAG_C (1 << ARMV7_CCNT)
1639#define ARMV7_FLAG_MASK 0xffffffff /* Mask for writable bits */
1640#define ARMV7_OVERFLOWED_MASK ARMV7_FLAG_MASK
1641
1642static inline unsigned long armv7_pmnc_read(void)
1643{
1644 u32 val;
1645 asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r"(val));
1646 return val;
1647}
1648
1649static inline void armv7_pmnc_write(unsigned long val)
1650{
1651 val &= ARMV7_PMNC_MASK;
1652 asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r"(val));
1653}
1654
1655static inline int armv7_pmnc_has_overflowed(unsigned long pmnc)
1656{
1657 return pmnc & ARMV7_OVERFLOWED_MASK;
1658}
1659
1660static inline int armv7_pmnc_counter_has_overflowed(unsigned long pmnc,
1661 enum armv7_counters counter)
1662{
1663 int ret;
1664
1665 if (counter == ARMV7_CYCLE_COUNTER)
1666 ret = pmnc & ARMV7_FLAG_C;
1667 else if ((counter >= ARMV7_COUNTER0) && (counter <= ARMV7_COUNTER_LAST))
1668 ret = pmnc & ARMV7_FLAG_P(counter);
1669 else
1670 pr_err("CPU%u checking wrong counter %d overflow status\n",
1671 smp_processor_id(), counter);
1672
1673 return ret;
1674}
1675
1676static inline int armv7_pmnc_select_counter(unsigned int idx)
1677{
1678 u32 val;
1679
1680 if ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST)) {
1681 pr_err("CPU%u selecting wrong PMNC counter"
1682 " %d\n", smp_processor_id(), idx);
1683 return -1;
1684 }
1685
1686 val = (idx - ARMV7_EVENT_CNT_TO_CNTx) & ARMV7_SELECT_MASK;
1687 asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val));
1688
1689 return idx;
1690}
1691
1692static inline u32 armv7pmu_read_counter(int idx)
1693{
1694 unsigned long value = 0;
1695
1696 if (idx == ARMV7_CYCLE_COUNTER)
1697 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (value));
1698 else if ((idx >= ARMV7_COUNTER0) && (idx <= ARMV7_COUNTER_LAST)) {
1699 if (armv7_pmnc_select_counter(idx) == idx)
1700 asm volatile("mrc p15, 0, %0, c9, c13, 2"
1701 : "=r" (value));
1702 } else
1703 pr_err("CPU%u reading wrong counter %d\n",
1704 smp_processor_id(), idx);
1705
1706 return value;
1707}
1708
1709static inline void armv7pmu_write_counter(int idx, u32 value)
1710{
1711 if (idx == ARMV7_CYCLE_COUNTER)
1712 asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (value));
1713 else if ((idx >= ARMV7_COUNTER0) && (idx <= ARMV7_COUNTER_LAST)) {
1714 if (armv7_pmnc_select_counter(idx) == idx)
1715 asm volatile("mcr p15, 0, %0, c9, c13, 2"
1716 : : "r" (value));
1717 } else
1718 pr_err("CPU%u writing wrong counter %d\n",
1719 smp_processor_id(), idx);
1720}
1721
1722static inline void armv7_pmnc_write_evtsel(unsigned int idx, u32 val)
1723{
1724 if (armv7_pmnc_select_counter(idx) == idx) {
1725 val &= ARMV7_EVTSEL_MASK;
1726 asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val));
1727 }
1728}
1729
1730static inline u32 armv7_pmnc_enable_counter(unsigned int idx)
1731{
1732 u32 val;
1733
1734 if ((idx != ARMV7_CYCLE_COUNTER) &&
1735 ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
1736 pr_err("CPU%u enabling wrong PMNC counter"
1737 " %d\n", smp_processor_id(), idx);
1738 return -1;
1739 }
1740
1741 if (idx == ARMV7_CYCLE_COUNTER)
1742 val = ARMV7_CNTENS_C;
1743 else
1744 val = ARMV7_CNTENS_P(idx);
1745
1746 asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val));
1747
1748 return idx;
1749}
1750
1751static inline u32 armv7_pmnc_disable_counter(unsigned int idx)
1752{
1753 u32 val;
1754
1755
1756 if ((idx != ARMV7_CYCLE_COUNTER) &&
1757 ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
1758 pr_err("CPU%u disabling wrong PMNC counter"
1759 " %d\n", smp_processor_id(), idx);
1760 return -1;
1761 }
1762
1763 if (idx == ARMV7_CYCLE_COUNTER)
1764 val = ARMV7_CNTENC_C;
1765 else
1766 val = ARMV7_CNTENC_P(idx);
1767
1768 asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val));
1769
1770 return idx;
1771}
1772
1773static inline u32 armv7_pmnc_enable_intens(unsigned int idx)
1774{
1775 u32 val;
1776
1777 if ((idx != ARMV7_CYCLE_COUNTER) &&
1778 ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
1779 pr_err("CPU%u enabling wrong PMNC counter"
1780 " interrupt enable %d\n", smp_processor_id(), idx);
1781 return -1;
1782 }
1783
1784 if (idx == ARMV7_CYCLE_COUNTER)
1785 val = ARMV7_INTENS_C;
1786 else
1787 val = ARMV7_INTENS_P(idx);
1788
1789 asm volatile("mcr p15, 0, %0, c9, c14, 1" : : "r" (val));
1790
1791 return idx;
1792}
1793
1794static inline u32 armv7_pmnc_disable_intens(unsigned int idx)
1795{
1796 u32 val;
1797
1798 if ((idx != ARMV7_CYCLE_COUNTER) &&
1799 ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) {
1800 pr_err("CPU%u disabling wrong PMNC counter"
1801 " interrupt enable %d\n", smp_processor_id(), idx);
1802 return -1;
1803 }
1804
1805 if (idx == ARMV7_CYCLE_COUNTER)
1806 val = ARMV7_INTENC_C;
1807 else
1808 val = ARMV7_INTENC_P(idx);
1809
1810 asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (val));
1811
1812 return idx;
1813}
1814
1815static inline u32 armv7_pmnc_getreset_flags(void)
1816{
1817 u32 val;
1818
1819 /* Read */
1820 asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val));
1821
1822 /* Write to clear flags */
1823 val &= ARMV7_FLAG_MASK;
1824 asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (val));
1825
1826 return val;
1827}
1828
1829#ifdef DEBUG
1830static void armv7_pmnc_dump_regs(void)
1831{
1832 u32 val;
1833 unsigned int cnt;
1834
1835 printk(KERN_INFO "PMNC registers dump:\n");
1836
1837 asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val));
1838 printk(KERN_INFO "PMNC =0x%08x\n", val);
1839
1840 asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r" (val));
1841 printk(KERN_INFO "CNTENS=0x%08x\n", val);
1842
1843 asm volatile("mrc p15, 0, %0, c9, c14, 1" : "=r" (val));
1844 printk(KERN_INFO "INTENS=0x%08x\n", val);
1845
1846 asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val));
1847 printk(KERN_INFO "FLAGS =0x%08x\n", val);
1848
1849 asm volatile("mrc p15, 0, %0, c9, c12, 5" : "=r" (val));
1850 printk(KERN_INFO "SELECT=0x%08x\n", val);
1851
1852 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));
1853 printk(KERN_INFO "CCNT =0x%08x\n", val);
1854
1855 for (cnt = ARMV7_COUNTER0; cnt < ARMV7_COUNTER_LAST; cnt++) {
1856 armv7_pmnc_select_counter(cnt);
1857 asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (val));
1858 printk(KERN_INFO "CNT[%d] count =0x%08x\n",
1859 cnt-ARMV7_EVENT_CNT_TO_CNTx, val);
1860 asm volatile("mrc p15, 0, %0, c9, c13, 1" : "=r" (val));
1861 printk(KERN_INFO "CNT[%d] evtsel=0x%08x\n",
1862 cnt-ARMV7_EVENT_CNT_TO_CNTx, val);
1863 }
1864}
1865#endif
1866
1867void armv7pmu_enable_event(struct hw_perf_event *hwc, int idx)
1868{
1869 unsigned long flags;
1870
1871 /*
1872 * Enable counter and interrupt, and set the counter to count
1873 * the event that we're interested in.
1874 */
1875 spin_lock_irqsave(&pmu_lock, flags);
1876
1877 /*
1878 * Disable counter
1879 */
1880 armv7_pmnc_disable_counter(idx);
1881
1882 /*
1883 * Set event (if destined for PMNx counters)
1884 * We don't need to set the event if it's a cycle count
1885 */
1886 if (idx != ARMV7_CYCLE_COUNTER)
1887 armv7_pmnc_write_evtsel(idx, hwc->config_base);
1888
1889 /*
1890 * Enable interrupt for this counter
1891 */
1892 armv7_pmnc_enable_intens(idx);
1893
1894 /*
1895 * Enable counter
1896 */
1897 armv7_pmnc_enable_counter(idx);
1898
1899 spin_unlock_irqrestore(&pmu_lock, flags);
1900}
1901
1902static void armv7pmu_disable_event(struct hw_perf_event *hwc, int idx)
1903{
1904 unsigned long flags;
1905
1906 /*
1907 * Disable counter and interrupt
1908 */
1909 spin_lock_irqsave(&pmu_lock, flags);
1910
1911 /*
1912 * Disable counter
1913 */
1914 armv7_pmnc_disable_counter(idx);
1915
1916 /*
1917 * Disable interrupt for this counter
1918 */
1919 armv7_pmnc_disable_intens(idx);
1920
1921 spin_unlock_irqrestore(&pmu_lock, flags);
1922}
1923
1924static irqreturn_t armv7pmu_handle_irq(int irq_num, void *dev)
1925{
1926 unsigned long pmnc;
1927 struct perf_sample_data data;
1928 struct cpu_hw_events *cpuc;
1929 struct pt_regs *regs;
1930 int idx;
1931
1932 /*
1933 * Get and reset the IRQ flags
1934 */
1935 pmnc = armv7_pmnc_getreset_flags();
1936
1937 /*
1938 * Did an overflow occur?
1939 */
1940 if (!armv7_pmnc_has_overflowed(pmnc))
1941 return IRQ_NONE;
1942
1943 /*
1944 * Handle the counter(s) overflow(s)
1945 */
1946 regs = get_irq_regs();
1947
1948 data.addr = 0;
1949
1950 cpuc = &__get_cpu_var(cpu_hw_events);
1951 for (idx = 0; idx <= armpmu->num_events; ++idx) {
1952 struct perf_event *event = cpuc->events[idx];
1953 struct hw_perf_event *hwc;
1954
1955 if (!test_bit(idx, cpuc->active_mask))
1956 continue;
1957
1958 /*
1959 * We have a single interrupt for all counters. Check that
1960 * each counter has overflowed before we process it.
1961 */
1962 if (!armv7_pmnc_counter_has_overflowed(pmnc, idx))
1963 continue;
1964
1965 hwc = &event->hw;
1966 armpmu_event_update(event, hwc, idx);
1967 data.period = event->hw.last_period;
1968 if (!armpmu_event_set_period(event, hwc, idx))
1969 continue;
1970
1971 if (perf_event_overflow(event, 0, &data, regs))
1972 armpmu->disable(hwc, idx);
1973 }
1974
1975 /*
1976 * Handle the pending perf events.
1977 *
1978 * Note: this call *must* be run with interrupts enabled. For
1979 * platforms that can have the PMU interrupts raised as a PMI, this
1980 * will not work.
1981 */
1982 perf_event_do_pending();
1983
1984 return IRQ_HANDLED;
1985}
1986
1987static void armv7pmu_start(void)
1988{
1989 unsigned long flags;
1990
1991 spin_lock_irqsave(&pmu_lock, flags);
1992 /* Enable all counters */
1993 armv7_pmnc_write(armv7_pmnc_read() | ARMV7_PMNC_E);
1994 spin_unlock_irqrestore(&pmu_lock, flags);
1995}
1996
1997static void armv7pmu_stop(void)
1998{
1999 unsigned long flags;
2000
2001 spin_lock_irqsave(&pmu_lock, flags);
2002 /* Disable all counters */
2003 armv7_pmnc_write(armv7_pmnc_read() & ~ARMV7_PMNC_E);
2004 spin_unlock_irqrestore(&pmu_lock, flags);
2005}
2006
2007static inline int armv7_a8_pmu_event_map(int config)
2008{
2009 int mapping = armv7_a8_perf_map[config];
2010 if (HW_OP_UNSUPPORTED == mapping)
2011 mapping = -EOPNOTSUPP;
2012 return mapping;
2013}
2014
2015static inline int armv7_a9_pmu_event_map(int config)
2016{
2017 int mapping = armv7_a9_perf_map[config];
2018 if (HW_OP_UNSUPPORTED == mapping)
2019 mapping = -EOPNOTSUPP;
2020 return mapping;
2021}
2022
2023static u64 armv7pmu_raw_event(u64 config)
2024{
2025 return config & 0xff;
2026}
2027
2028static int armv7pmu_get_event_idx(struct cpu_hw_events *cpuc,
2029 struct hw_perf_event *event)
2030{
2031 int idx;
2032
2033 /* Always place a cycle counter into the cycle counter. */
2034 if (event->config_base == ARMV7_PERFCTR_CPU_CYCLES) {
2035 if (test_and_set_bit(ARMV7_CYCLE_COUNTER, cpuc->used_mask))
2036 return -EAGAIN;
2037
2038 return ARMV7_CYCLE_COUNTER;
2039 } else {
2040 /*
2041 * For anything other than a cycle counter, try and use
2042 * the events counters
2043 */
2044 for (idx = ARMV7_COUNTER0; idx <= armpmu->num_events; ++idx) {
2045 if (!test_and_set_bit(idx, cpuc->used_mask))
2046 return idx;
2047 }
2048
2049 /* The counters are all in use. */
2050 return -EAGAIN;
2051 }
2052}
2053
2054static struct arm_pmu armv7pmu = {
2055 .handle_irq = armv7pmu_handle_irq,
2056 .enable = armv7pmu_enable_event,
2057 .disable = armv7pmu_disable_event,
2058 .raw_event = armv7pmu_raw_event,
2059 .read_counter = armv7pmu_read_counter,
2060 .write_counter = armv7pmu_write_counter,
2061 .get_event_idx = armv7pmu_get_event_idx,
2062 .start = armv7pmu_start,
2063 .stop = armv7pmu_stop,
2064 .max_period = (1LLU << 32) - 1,
2065};
2066
2067static u32 __init armv7_reset_read_pmnc(void)
2068{
2069 u32 nb_cnt;
2070
2071 /* Initialize & Reset PMNC: C and P bits */
2072 armv7_pmnc_write(ARMV7_PMNC_P | ARMV7_PMNC_C);
2073
2074 /* Read the nb of CNTx counters supported from PMNC */
2075 nb_cnt = (armv7_pmnc_read() >> ARMV7_PMNC_N_SHIFT) & ARMV7_PMNC_N_MASK;
2076
2077 /* Add the CPU cycles counter and return */
2078 return nb_cnt + 1;
2079}
2080
2081static int __init
2082init_hw_perf_events(void)
2083{
2084 unsigned long cpuid = read_cpuid_id();
2085 unsigned long implementor = (cpuid & 0xFF000000) >> 24;
2086 unsigned long part_number = (cpuid & 0xFFF0);
2087
2088 /* We only support ARM CPUs implemented by ARM at the moment. */
2089 if (0x41 == implementor) {
2090 switch (part_number) {
2091 case 0xB360: /* ARM1136 */
2092 case 0xB560: /* ARM1156 */
2093 case 0xB760: /* ARM1176 */
2094 armpmu = &armv6pmu;
2095 memcpy(armpmu_perf_cache_map, armv6_perf_cache_map,
2096 sizeof(armv6_perf_cache_map));
2097 perf_max_events = armv6pmu.num_events;
2098 break;
2099 case 0xB020: /* ARM11mpcore */
2100 armpmu = &armv6mpcore_pmu;
2101 memcpy(armpmu_perf_cache_map,
2102 armv6mpcore_perf_cache_map,
2103 sizeof(armv6mpcore_perf_cache_map));
2104 perf_max_events = armv6mpcore_pmu.num_events;
2105 break;
2106 case 0xC080: /* Cortex-A8 */
2107 armv7pmu.name = ARMV7_PMU_CORTEX_A8_NAME;
2108 memcpy(armpmu_perf_cache_map, armv7_a8_perf_cache_map,
2109 sizeof(armv7_a8_perf_cache_map));
2110 armv7pmu.event_map = armv7_a8_pmu_event_map;
2111 armpmu = &armv7pmu;
2112
2113 /* Reset PMNC and read the nb of CNTx counters
2114 supported */
2115 armv7pmu.num_events = armv7_reset_read_pmnc();
2116 perf_max_events = armv7pmu.num_events;
2117 break;
2118 case 0xC090: /* Cortex-A9 */
2119 armv7pmu.name = ARMV7_PMU_CORTEX_A9_NAME;
2120 memcpy(armpmu_perf_cache_map, armv7_a9_perf_cache_map,
2121 sizeof(armv7_a9_perf_cache_map));
2122 armv7pmu.event_map = armv7_a9_pmu_event_map;
2123 armpmu = &armv7pmu;
2124
2125 /* Reset PMNC and read the nb of CNTx counters
2126 supported */
2127 armv7pmu.num_events = armv7_reset_read_pmnc();
2128 perf_max_events = armv7pmu.num_events;
2129 break;
2130 default:
2131 pr_info("no hardware support available\n");
2132 perf_max_events = -1;
2133 }
2134 }
2135
2136 if (armpmu)
2137 pr_info("enabled with %s PMU driver, %d counters available\n",
2138 armpmu->name, armpmu->num_events);
2139
2140 return 0;
2141}
2142arch_initcall(init_hw_perf_events);
2143
2144/*
2145 * Callchain handling code.
2146 */
2147static inline void
2148callchain_store(struct perf_callchain_entry *entry,
2149 u64 ip)
2150{
2151 if (entry->nr < PERF_MAX_STACK_DEPTH)
2152 entry->ip[entry->nr++] = ip;
2153}
2154
2155/*
2156 * The registers we're interested in are at the end of the variable
2157 * length saved register structure. The fp points at the end of this
2158 * structure so the address of this struct is:
2159 * (struct frame_tail *)(xxx->fp)-1
2160 *
2161 * This code has been adapted from the ARM OProfile support.
2162 */
2163struct frame_tail {
2164 struct frame_tail *fp;
2165 unsigned long sp;
2166 unsigned long lr;
2167} __attribute__((packed));
2168
2169/*
2170 * Get the return address for a single stackframe and return a pointer to the
2171 * next frame tail.
2172 */
2173static struct frame_tail *
2174user_backtrace(struct frame_tail *tail,
2175 struct perf_callchain_entry *entry)
2176{
2177 struct frame_tail buftail;
2178
2179 /* Also check accessibility of one struct frame_tail beyond */
2180 if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
2181 return NULL;
2182 if (__copy_from_user_inatomic(&buftail, tail, sizeof(buftail)))
2183 return NULL;
2184
2185 callchain_store(entry, buftail.lr);
2186
2187 /*
2188 * Frame pointers should strictly progress back up the stack
2189 * (towards higher addresses).
2190 */
2191 if (tail >= buftail.fp)
2192 return NULL;
2193
2194 return buftail.fp - 1;
2195}
2196
2197static void
2198perf_callchain_user(struct pt_regs *regs,
2199 struct perf_callchain_entry *entry)
2200{
2201 struct frame_tail *tail;
2202
2203 callchain_store(entry, PERF_CONTEXT_USER);
2204
2205 if (!user_mode(regs))
2206 regs = task_pt_regs(current);
2207
2208 tail = (struct frame_tail *)regs->ARM_fp - 1;
2209
2210 while (tail && !((unsigned long)tail & 0x3))
2211 tail = user_backtrace(tail, entry);
2212}
2213
2214/*
2215 * Gets called by walk_stackframe() for every stackframe. This will be called
2216 * whist unwinding the stackframe and is like a subroutine return so we use
2217 * the PC.
2218 */
2219static int
2220callchain_trace(struct stackframe *fr,
2221 void *data)
2222{
2223 struct perf_callchain_entry *entry = data;
2224 callchain_store(entry, fr->pc);
2225 return 0;
2226}
2227
2228static void
2229perf_callchain_kernel(struct pt_regs *regs,
2230 struct perf_callchain_entry *entry)
2231{
2232 struct stackframe fr;
2233
2234 callchain_store(entry, PERF_CONTEXT_KERNEL);
2235 fr.fp = regs->ARM_fp;
2236 fr.sp = regs->ARM_sp;
2237 fr.lr = regs->ARM_lr;
2238 fr.pc = regs->ARM_pc;
2239 walk_stackframe(&fr, callchain_trace, entry);
2240}
2241
2242static void
2243perf_do_callchain(struct pt_regs *regs,
2244 struct perf_callchain_entry *entry)
2245{
2246 int is_user;
2247
2248 if (!regs)
2249 return;
2250
2251 is_user = user_mode(regs);
2252
2253 if (!current || !current->pid)
2254 return;
2255
2256 if (is_user && current->state != TASK_RUNNING)
2257 return;
2258
2259 if (!is_user)
2260 perf_callchain_kernel(regs, entry);
2261
2262 if (current->mm)
2263 perf_callchain_user(regs, entry);
2264}
2265
2266static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_irq_entry);
2267
2268struct perf_callchain_entry *
2269perf_callchain(struct pt_regs *regs)
2270{
2271 struct perf_callchain_entry *entry = &__get_cpu_var(pmc_irq_entry);
2272
2273 entry->nr = 0;
2274 perf_do_callchain(regs, entry);
2275 return entry;
2276}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-26 08:47:59 -0500