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Jamie Iles1b8873a2010-02-02 20:25:44 +01001#undef DEBUG
2
3/*
4 * ARM performance counter support.
5 *
6 * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
Will Deacon43eab872010-11-13 19:04:32 +00007 * Copyright (C) 2010 ARM Ltd., Will Deacon <will.deacon@arm.com>
Jean PIHET796d1292010-01-26 18:51:05 +01008 *
Jamie Iles1b8873a2010-02-02 20:25:44 +01009 * This code is based on the sparc64 perf event code, which is in turn based
Mark Rutlandd39976f2014-09-29 17:15:32 +010010 * on the x86 code.
Jamie Iles1b8873a2010-02-02 20:25:44 +010011 */
12#define pr_fmt(fmt) "hw perfevents: " fmt
13
Mark Rutland74cf0bc2015-05-26 17:23:39 +010014#include <linux/bitmap.h>
Mark Rutlandcc881162015-05-13 17:12:25 +010015#include <linux/cpumask.h>
Lorenzo Pieralisida4e4f12016-02-23 18:22:39 +000016#include <linux/cpu_pm.h>
Mark Rutland74cf0bc2015-05-26 17:23:39 +010017#include <linux/export.h>
Jamie Iles1b8873a2010-02-02 20:25:44 +010018#include <linux/kernel.h>
Sudeep Hollabc1e3c42015-06-30 13:56:57 +010019#include <linux/of_device.h>
Mark Rutlandfa8ad782015-07-06 12:23:53 +010020#include <linux/perf/arm_pmu.h>
Will Deacon49c006b2010-04-29 17:13:24 +010021#include <linux/platform_device.h>
Mark Rutland74cf0bc2015-05-26 17:23:39 +010022#include <linux/slab.h>
23#include <linux/spinlock.h>
Stephen Boydbbd64552014-02-07 21:01:19 +000024#include <linux/irq.h>
25#include <linux/irqdesc.h>
Jamie Iles1b8873a2010-02-02 20:25:44 +010026
Mark Rutland74cf0bc2015-05-26 17:23:39 +010027#include <asm/cputype.h>
Jamie Iles1b8873a2010-02-02 20:25:44 +010028#include <asm/irq_regs.h>
Jamie Iles1b8873a2010-02-02 20:25:44 +010029
Jamie Iles1b8873a2010-02-02 20:25:44 +010030static int
Mark Rutlande1f431b2011-04-28 15:47:10 +010031armpmu_map_cache_event(const unsigned (*cache_map)
32 [PERF_COUNT_HW_CACHE_MAX]
33 [PERF_COUNT_HW_CACHE_OP_MAX]
34 [PERF_COUNT_HW_CACHE_RESULT_MAX],
35 u64 config)
Jamie Iles1b8873a2010-02-02 20:25:44 +010036{
37 unsigned int cache_type, cache_op, cache_result, ret;
38
39 cache_type = (config >> 0) & 0xff;
40 if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
41 return -EINVAL;
42
43 cache_op = (config >> 8) & 0xff;
44 if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
45 return -EINVAL;
46
47 cache_result = (config >> 16) & 0xff;
48 if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
49 return -EINVAL;
50
Mark Rutlande1f431b2011-04-28 15:47:10 +010051 ret = (int)(*cache_map)[cache_type][cache_op][cache_result];
Jamie Iles1b8873a2010-02-02 20:25:44 +010052
53 if (ret == CACHE_OP_UNSUPPORTED)
54 return -ENOENT;
55
56 return ret;
57}
58
59static int
Will Deacon6dbc0022012-07-29 12:36:28 +010060armpmu_map_hw_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
Will Deacon84fee972010-11-13 17:13:56 +000061{
Stephen Boydd9f96632013-08-08 18:41:59 +010062 int mapping;
63
64 if (config >= PERF_COUNT_HW_MAX)
65 return -EINVAL;
66
67 mapping = (*event_map)[config];
Mark Rutlande1f431b2011-04-28 15:47:10 +010068 return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
Will Deacon84fee972010-11-13 17:13:56 +000069}
70
71static int
Mark Rutlande1f431b2011-04-28 15:47:10 +010072armpmu_map_raw_event(u32 raw_event_mask, u64 config)
Will Deacon84fee972010-11-13 17:13:56 +000073{
Mark Rutlande1f431b2011-04-28 15:47:10 +010074 return (int)(config & raw_event_mask);
75}
76
Will Deacon6dbc0022012-07-29 12:36:28 +010077int
78armpmu_map_event(struct perf_event *event,
79 const unsigned (*event_map)[PERF_COUNT_HW_MAX],
80 const unsigned (*cache_map)
81 [PERF_COUNT_HW_CACHE_MAX]
82 [PERF_COUNT_HW_CACHE_OP_MAX]
83 [PERF_COUNT_HW_CACHE_RESULT_MAX],
84 u32 raw_event_mask)
Mark Rutlande1f431b2011-04-28 15:47:10 +010085{
86 u64 config = event->attr.config;
Mark Rutland67b43052012-09-12 10:53:23 +010087 int type = event->attr.type;
Mark Rutlande1f431b2011-04-28 15:47:10 +010088
Mark Rutland67b43052012-09-12 10:53:23 +010089 if (type == event->pmu->type)
90 return armpmu_map_raw_event(raw_event_mask, config);
91
92 switch (type) {
Mark Rutlande1f431b2011-04-28 15:47:10 +010093 case PERF_TYPE_HARDWARE:
Will Deacon6dbc0022012-07-29 12:36:28 +010094 return armpmu_map_hw_event(event_map, config);
Mark Rutlande1f431b2011-04-28 15:47:10 +010095 case PERF_TYPE_HW_CACHE:
96 return armpmu_map_cache_event(cache_map, config);
97 case PERF_TYPE_RAW:
98 return armpmu_map_raw_event(raw_event_mask, config);
99 }
100
101 return -ENOENT;
Will Deacon84fee972010-11-13 17:13:56 +0000102}
103
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100104int armpmu_event_set_period(struct perf_event *event)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100105{
Mark Rutland8a16b342011-04-28 16:27:54 +0100106 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100107 struct hw_perf_event *hwc = &event->hw;
Peter Zijlstrae7850592010-05-21 14:43:08 +0200108 s64 left = local64_read(&hwc->period_left);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100109 s64 period = hwc->sample_period;
110 int ret = 0;
111
112 if (unlikely(left <= -period)) {
113 left = period;
Peter Zijlstrae7850592010-05-21 14:43:08 +0200114 local64_set(&hwc->period_left, left);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100115 hwc->last_period = period;
116 ret = 1;
117 }
118
119 if (unlikely(left <= 0)) {
120 left += period;
Peter Zijlstrae7850592010-05-21 14:43:08 +0200121 local64_set(&hwc->period_left, left);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100122 hwc->last_period = period;
123 ret = 1;
124 }
125
Daniel Thompson2d9ed742015-01-05 15:58:54 +0100126 /*
127 * Limit the maximum period to prevent the counter value
128 * from overtaking the one we are about to program. In
129 * effect we are reducing max_period to account for
130 * interrupt latency (and we are being very conservative).
131 */
132 if (left > (armpmu->max_period >> 1))
133 left = armpmu->max_period >> 1;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100134
Peter Zijlstrae7850592010-05-21 14:43:08 +0200135 local64_set(&hwc->prev_count, (u64)-left);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100136
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100137 armpmu->write_counter(event, (u64)(-left) & 0xffffffff);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100138
139 perf_event_update_userpage(event);
140
141 return ret;
142}
143
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100144u64 armpmu_event_update(struct perf_event *event)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100145{
Mark Rutland8a16b342011-04-28 16:27:54 +0100146 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100147 struct hw_perf_event *hwc = &event->hw;
Will Deacona7378232011-03-25 17:12:37 +0100148 u64 delta, prev_raw_count, new_raw_count;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100149
150again:
Peter Zijlstrae7850592010-05-21 14:43:08 +0200151 prev_raw_count = local64_read(&hwc->prev_count);
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100152 new_raw_count = armpmu->read_counter(event);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100153
Peter Zijlstrae7850592010-05-21 14:43:08 +0200154 if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
Jamie Iles1b8873a2010-02-02 20:25:44 +0100155 new_raw_count) != prev_raw_count)
156 goto again;
157
Will Deacon57273472012-03-06 17:33:17 +0100158 delta = (new_raw_count - prev_raw_count) & armpmu->max_period;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100159
Peter Zijlstrae7850592010-05-21 14:43:08 +0200160 local64_add(delta, &event->count);
161 local64_sub(delta, &hwc->period_left);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100162
163 return new_raw_count;
164}
165
166static void
Jamie Iles1b8873a2010-02-02 20:25:44 +0100167armpmu_read(struct perf_event *event)
168{
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100169 armpmu_event_update(event);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100170}
171
172static void
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200173armpmu_stop(struct perf_event *event, int flags)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100174{
Mark Rutland8a16b342011-04-28 16:27:54 +0100175 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100176 struct hw_perf_event *hwc = &event->hw;
177
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200178 /*
179 * ARM pmu always has to update the counter, so ignore
180 * PERF_EF_UPDATE, see comments in armpmu_start().
181 */
182 if (!(hwc->state & PERF_HES_STOPPED)) {
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100183 armpmu->disable(event);
184 armpmu_event_update(event);
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200185 hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
186 }
187}
188
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100189static void armpmu_start(struct perf_event *event, int flags)
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200190{
Mark Rutland8a16b342011-04-28 16:27:54 +0100191 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200192 struct hw_perf_event *hwc = &event->hw;
193
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200194 /*
195 * ARM pmu always has to reprogram the period, so ignore
196 * PERF_EF_RELOAD, see the comment below.
197 */
198 if (flags & PERF_EF_RELOAD)
199 WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
200
201 hwc->state = 0;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100202 /*
203 * Set the period again. Some counters can't be stopped, so when we
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200204 * were stopped we simply disabled the IRQ source and the counter
Jamie Iles1b8873a2010-02-02 20:25:44 +0100205 * may have been left counting. If we don't do this step then we may
206 * get an interrupt too soon or *way* too late if the overflow has
207 * happened since disabling.
208 */
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100209 armpmu_event_set_period(event);
210 armpmu->enable(event);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100211}
212
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200213static void
214armpmu_del(struct perf_event *event, int flags)
215{
Mark Rutland8a16b342011-04-28 16:27:54 +0100216 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Mark Rutland11679252014-05-13 19:36:31 +0100217 struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200218 struct hw_perf_event *hwc = &event->hw;
219 int idx = hwc->idx;
220
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200221 armpmu_stop(event, PERF_EF_UPDATE);
Mark Rutland8be3f9a2011-05-17 11:20:11 +0100222 hw_events->events[idx] = NULL;
223 clear_bit(idx, hw_events->used_mask);
Stephen Boydeab443e2014-02-07 21:01:22 +0000224 if (armpmu->clear_event_idx)
225 armpmu->clear_event_idx(hw_events, event);
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200226
227 perf_event_update_userpage(event);
228}
229
Jamie Iles1b8873a2010-02-02 20:25:44 +0100230static int
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200231armpmu_add(struct perf_event *event, int flags)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100232{
Mark Rutland8a16b342011-04-28 16:27:54 +0100233 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Mark Rutland11679252014-05-13 19:36:31 +0100234 struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100235 struct hw_perf_event *hwc = &event->hw;
236 int idx;
237 int err = 0;
238
Mark Rutlandcc881162015-05-13 17:12:25 +0100239 /* An event following a process won't be stopped earlier */
240 if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
241 return -ENOENT;
242
Peter Zijlstra33696fc2010-06-14 08:49:00 +0200243 perf_pmu_disable(event->pmu);
Peter Zijlstra24cd7f52010-06-11 17:32:03 +0200244
Jamie Iles1b8873a2010-02-02 20:25:44 +0100245 /* If we don't have a space for the counter then finish early. */
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100246 idx = armpmu->get_event_idx(hw_events, event);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100247 if (idx < 0) {
248 err = idx;
249 goto out;
250 }
251
252 /*
253 * If there is an event in the counter we are going to use then make
254 * sure it is disabled.
255 */
256 event->hw.idx = idx;
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100257 armpmu->disable(event);
Mark Rutland8be3f9a2011-05-17 11:20:11 +0100258 hw_events->events[idx] = event;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100259
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200260 hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
261 if (flags & PERF_EF_START)
262 armpmu_start(event, PERF_EF_RELOAD);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100263
264 /* Propagate our changes to the userspace mapping. */
265 perf_event_update_userpage(event);
266
267out:
Peter Zijlstra33696fc2010-06-14 08:49:00 +0200268 perf_pmu_enable(event->pmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100269 return err;
270}
271
Jamie Iles1b8873a2010-02-02 20:25:44 +0100272static int
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000273validate_event(struct pmu *pmu, struct pmu_hw_events *hw_events,
274 struct perf_event *event)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100275{
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000276 struct arm_pmu *armpmu;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100277
Will Deaconc95eb312013-08-07 23:39:41 +0100278 if (is_software_event(event))
279 return 1;
280
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000281 /*
282 * Reject groups spanning multiple HW PMUs (e.g. CPU + CCI). The
283 * core perf code won't check that the pmu->ctx == leader->ctx
284 * until after pmu->event_init(event).
285 */
286 if (event->pmu != pmu)
287 return 0;
288
Will Deacon2dfcb802013-10-09 13:51:29 +0100289 if (event->state < PERF_EVENT_STATE_OFF)
Will Deaconcb2d8b32013-04-12 19:04:19 +0100290 return 1;
291
292 if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec)
Will Deacon65b47112010-09-02 09:32:08 +0100293 return 1;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100294
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000295 armpmu = to_arm_pmu(event->pmu);
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100296 return armpmu->get_event_idx(hw_events, event) >= 0;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100297}
298
299static int
300validate_group(struct perf_event *event)
301{
302 struct perf_event *sibling, *leader = event->group_leader;
Mark Rutland8be3f9a2011-05-17 11:20:11 +0100303 struct pmu_hw_events fake_pmu;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100304
Will Deaconbce34d12011-11-17 15:05:14 +0000305 /*
306 * Initialise the fake PMU. We only need to populate the
307 * used_mask for the purposes of validation.
308 */
Mark Rutlanda4560842014-05-13 19:08:19 +0100309 memset(&fake_pmu.used_mask, 0, sizeof(fake_pmu.used_mask));
Jamie Iles1b8873a2010-02-02 20:25:44 +0100310
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000311 if (!validate_event(event->pmu, &fake_pmu, leader))
Peter Zijlstraaa2bc1a2011-11-09 17:56:37 +0100312 return -EINVAL;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100313
314 list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000315 if (!validate_event(event->pmu, &fake_pmu, sibling))
Peter Zijlstraaa2bc1a2011-11-09 17:56:37 +0100316 return -EINVAL;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100317 }
318
Suzuki K. Poulosee4298172015-03-17 18:14:58 +0000319 if (!validate_event(event->pmu, &fake_pmu, event))
Peter Zijlstraaa2bc1a2011-11-09 17:56:37 +0100320 return -EINVAL;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100321
322 return 0;
323}
324
Mark Rutland80e1caf2017-04-11 09:39:49 +0100325static struct arm_pmu_platdata *armpmu_get_platdata(struct arm_pmu *armpmu)
326{
327 struct platform_device *pdev = armpmu->plat_device;
328
329 return pdev ? dev_get_platdata(&pdev->dev) : NULL;
330}
331
Sudeep KarkadaNagesha051f1b12012-07-31 10:34:25 +0100332static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
Rabin Vincent0e25a5c2011-02-08 09:24:36 +0530333{
Stephen Boydbbd64552014-02-07 21:01:19 +0000334 struct arm_pmu *armpmu;
Stephen Boydbbd64552014-02-07 21:01:19 +0000335 struct arm_pmu_platdata *plat;
Will Deacon5f5092e2014-02-11 18:08:41 +0000336 int ret;
337 u64 start_clock, finish_clock;
Stephen Boydbbd64552014-02-07 21:01:19 +0000338
Mark Rutland5ebd9202014-05-13 19:46:10 +0100339 /*
340 * we request the IRQ with a (possibly percpu) struct arm_pmu**, but
341 * the handlers expect a struct arm_pmu*. The percpu_irq framework will
342 * do any necessary shifting, we just need to perform the first
343 * dereference.
344 */
345 armpmu = *(void **)dev;
Mark Rutland80e1caf2017-04-11 09:39:49 +0100346
347 plat = armpmu_get_platdata(armpmu);
Rabin Vincent0e25a5c2011-02-08 09:24:36 +0530348
Will Deacon5f5092e2014-02-11 18:08:41 +0000349 start_clock = sched_clock();
Sudeep KarkadaNagesha051f1b12012-07-31 10:34:25 +0100350 if (plat && plat->handle_irq)
Mark Rutland5ebd9202014-05-13 19:46:10 +0100351 ret = plat->handle_irq(irq, armpmu, armpmu->handle_irq);
Sudeep KarkadaNagesha051f1b12012-07-31 10:34:25 +0100352 else
Mark Rutland5ebd9202014-05-13 19:46:10 +0100353 ret = armpmu->handle_irq(irq, armpmu);
Will Deacon5f5092e2014-02-11 18:08:41 +0000354 finish_clock = sched_clock();
355
356 perf_sample_event_took(finish_clock - start_clock);
357 return ret;
Rabin Vincent0e25a5c2011-02-08 09:24:36 +0530358}
359
Will Deacon0b390e22011-07-27 15:18:59 +0100360static void
Mark Rutland8a16b342011-04-28 16:27:54 +0100361armpmu_release_hardware(struct arm_pmu *armpmu)
Will Deacon0b390e22011-07-27 15:18:59 +0100362{
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100363 armpmu->free_irq(armpmu);
Will Deacon0b390e22011-07-27 15:18:59 +0100364}
365
Jamie Iles1b8873a2010-02-02 20:25:44 +0100366static int
Mark Rutland8a16b342011-04-28 16:27:54 +0100367armpmu_reserve_hardware(struct arm_pmu *armpmu)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100368{
Mark Rutlanded61f982015-05-26 17:23:34 +0100369 int err = armpmu->request_irq(armpmu, armpmu_dispatch_irq);
Sudeep KarkadaNagesha051f1b12012-07-31 10:34:25 +0100370 if (err) {
371 armpmu_release_hardware(armpmu);
372 return err;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100373 }
374
Will Deacon0b390e22011-07-27 15:18:59 +0100375 return 0;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100376}
377
Jamie Iles1b8873a2010-02-02 20:25:44 +0100378static void
379hw_perf_event_destroy(struct perf_event *event)
380{
Mark Rutland8a16b342011-04-28 16:27:54 +0100381 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Mark Rutland03b78982011-04-27 11:20:11 +0100382 atomic_t *active_events = &armpmu->active_events;
383 struct mutex *pmu_reserve_mutex = &armpmu->reserve_mutex;
384
385 if (atomic_dec_and_mutex_lock(active_events, pmu_reserve_mutex)) {
Mark Rutland8a16b342011-04-28 16:27:54 +0100386 armpmu_release_hardware(armpmu);
Mark Rutland03b78982011-04-27 11:20:11 +0100387 mutex_unlock(pmu_reserve_mutex);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100388 }
389}
390
391static int
Will Deacon05d22fd2011-07-19 11:57:30 +0100392event_requires_mode_exclusion(struct perf_event_attr *attr)
393{
394 return attr->exclude_idle || attr->exclude_user ||
395 attr->exclude_kernel || attr->exclude_hv;
396}
397
398static int
Jamie Iles1b8873a2010-02-02 20:25:44 +0100399__hw_perf_event_init(struct perf_event *event)
400{
Mark Rutland8a16b342011-04-28 16:27:54 +0100401 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100402 struct hw_perf_event *hwc = &event->hw;
Mark Rutland9dcbf462013-01-18 16:10:06 +0000403 int mapping;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100404
Mark Rutlande1f431b2011-04-28 15:47:10 +0100405 mapping = armpmu->map_event(event);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100406
407 if (mapping < 0) {
408 pr_debug("event %x:%llx not supported\n", event->attr.type,
409 event->attr.config);
410 return mapping;
411 }
412
413 /*
Will Deacon05d22fd2011-07-19 11:57:30 +0100414 * We don't assign an index until we actually place the event onto
415 * hardware. Use -1 to signify that we haven't decided where to put it
416 * yet. For SMP systems, each core has it's own PMU so we can't do any
417 * clever allocation or constraints checking at this point.
Jamie Iles1b8873a2010-02-02 20:25:44 +0100418 */
Will Deacon05d22fd2011-07-19 11:57:30 +0100419 hwc->idx = -1;
420 hwc->config_base = 0;
421 hwc->config = 0;
422 hwc->event_base = 0;
423
424 /*
425 * Check whether we need to exclude the counter from certain modes.
426 */
427 if ((!armpmu->set_event_filter ||
428 armpmu->set_event_filter(hwc, &event->attr)) &&
429 event_requires_mode_exclusion(&event->attr)) {
Jamie Iles1b8873a2010-02-02 20:25:44 +0100430 pr_debug("ARM performance counters do not support "
431 "mode exclusion\n");
Will Deaconfdeb8e32012-07-04 18:15:42 +0100432 return -EOPNOTSUPP;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100433 }
434
435 /*
Will Deacon05d22fd2011-07-19 11:57:30 +0100436 * Store the event encoding into the config_base field.
Jamie Iles1b8873a2010-02-02 20:25:44 +0100437 */
Will Deacon05d22fd2011-07-19 11:57:30 +0100438 hwc->config_base |= (unsigned long)mapping;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100439
Vince Weaveredcb4d32014-05-16 17:15:49 -0400440 if (!is_sampling_event(event)) {
Will Deacon57273472012-03-06 17:33:17 +0100441 /*
442 * For non-sampling runs, limit the sample_period to half
443 * of the counter width. That way, the new counter value
444 * is far less likely to overtake the previous one unless
445 * you have some serious IRQ latency issues.
446 */
447 hwc->sample_period = armpmu->max_period >> 1;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100448 hwc->last_period = hwc->sample_period;
Peter Zijlstrae7850592010-05-21 14:43:08 +0200449 local64_set(&hwc->period_left, hwc->sample_period);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100450 }
451
Jamie Iles1b8873a2010-02-02 20:25:44 +0100452 if (event->group_leader != event) {
Chen Gange595ede2013-02-28 17:51:29 +0100453 if (validate_group(event) != 0)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100454 return -EINVAL;
455 }
456
Mark Rutland9dcbf462013-01-18 16:10:06 +0000457 return 0;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100458}
459
Peter Zijlstrab0a873e2010-06-11 13:35:08 +0200460static int armpmu_event_init(struct perf_event *event)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100461{
Mark Rutland8a16b342011-04-28 16:27:54 +0100462 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100463 int err = 0;
Mark Rutland03b78982011-04-27 11:20:11 +0100464 atomic_t *active_events = &armpmu->active_events;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100465
Mark Rutlandcc881162015-05-13 17:12:25 +0100466 /*
467 * Reject CPU-affine events for CPUs that are of a different class to
468 * that which this PMU handles. Process-following events (where
469 * event->cpu == -1) can be migrated between CPUs, and thus we have to
470 * reject them later (in armpmu_add) if they're scheduled on a
471 * different class of CPU.
472 */
473 if (event->cpu != -1 &&
474 !cpumask_test_cpu(event->cpu, &armpmu->supported_cpus))
475 return -ENOENT;
476
Stephane Eranian2481c5f2012-02-09 23:20:59 +0100477 /* does not support taken branch sampling */
478 if (has_branch_stack(event))
479 return -EOPNOTSUPP;
480
Mark Rutlande1f431b2011-04-28 15:47:10 +0100481 if (armpmu->map_event(event) == -ENOENT)
Peter Zijlstrab0a873e2010-06-11 13:35:08 +0200482 return -ENOENT;
Peter Zijlstrab0a873e2010-06-11 13:35:08 +0200483
Jamie Iles1b8873a2010-02-02 20:25:44 +0100484 event->destroy = hw_perf_event_destroy;
485
Mark Rutland03b78982011-04-27 11:20:11 +0100486 if (!atomic_inc_not_zero(active_events)) {
487 mutex_lock(&armpmu->reserve_mutex);
488 if (atomic_read(active_events) == 0)
Mark Rutland8a16b342011-04-28 16:27:54 +0100489 err = armpmu_reserve_hardware(armpmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100490
491 if (!err)
Mark Rutland03b78982011-04-27 11:20:11 +0100492 atomic_inc(active_events);
493 mutex_unlock(&armpmu->reserve_mutex);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100494 }
495
496 if (err)
Peter Zijlstrab0a873e2010-06-11 13:35:08 +0200497 return err;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100498
499 err = __hw_perf_event_init(event);
500 if (err)
501 hw_perf_event_destroy(event);
502
Peter Zijlstrab0a873e2010-06-11 13:35:08 +0200503 return err;
Jamie Iles1b8873a2010-02-02 20:25:44 +0100504}
505
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200506static void armpmu_enable(struct pmu *pmu)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100507{
Mark Rutland8be3f9a2011-05-17 11:20:11 +0100508 struct arm_pmu *armpmu = to_arm_pmu(pmu);
Mark Rutland11679252014-05-13 19:36:31 +0100509 struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
Mark Rutland7325eae2011-08-23 11:59:49 +0100510 int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100511
Mark Rutlandcc881162015-05-13 17:12:25 +0100512 /* For task-bound events we may be called on other CPUs */
513 if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
514 return;
515
Will Deaconf4f38432011-07-01 14:38:12 +0100516 if (enabled)
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100517 armpmu->start(armpmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100518}
519
Peter Zijlstraa4eaf7f2010-06-16 14:37:10 +0200520static void armpmu_disable(struct pmu *pmu)
Jamie Iles1b8873a2010-02-02 20:25:44 +0100521{
Mark Rutland8a16b342011-04-28 16:27:54 +0100522 struct arm_pmu *armpmu = to_arm_pmu(pmu);
Mark Rutlandcc881162015-05-13 17:12:25 +0100523
524 /* For task-bound events we may be called on other CPUs */
525 if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
526 return;
527
Sudeep KarkadaNageshaed6f2a52012-07-30 12:00:02 +0100528 armpmu->stop(armpmu);
Jamie Iles1b8873a2010-02-02 20:25:44 +0100529}
530
Mark Rutlandc904e322015-05-13 17:12:26 +0100531/*
532 * In heterogeneous systems, events are specific to a particular
533 * microarchitecture, and aren't suitable for another. Thus, only match CPUs of
534 * the same microarchitecture.
535 */
536static int armpmu_filter_match(struct perf_event *event)
537{
538 struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
539 unsigned int cpu = smp_processor_id();
540 return cpumask_test_cpu(cpu, &armpmu->supported_cpus);
541}
542
Mark Rutland48538b52016-09-09 14:08:30 +0100543static ssize_t armpmu_cpumask_show(struct device *dev,
544 struct device_attribute *attr, char *buf)
545{
546 struct arm_pmu *armpmu = to_arm_pmu(dev_get_drvdata(dev));
547 return cpumap_print_to_pagebuf(true, buf, &armpmu->supported_cpus);
548}
549
550static DEVICE_ATTR(cpus, S_IRUGO, armpmu_cpumask_show, NULL);
551
552static struct attribute *armpmu_common_attrs[] = {
553 &dev_attr_cpus.attr,
554 NULL,
555};
556
557static struct attribute_group armpmu_common_attr_group = {
558 .attrs = armpmu_common_attrs,
559};
560
Stephen Boyd44d6b1f2013-03-05 03:54:06 +0100561static void armpmu_init(struct arm_pmu *armpmu)
Mark Rutland03b78982011-04-27 11:20:11 +0100562{
563 atomic_set(&armpmu->active_events, 0);
564 mutex_init(&armpmu->reserve_mutex);
Mark Rutland8a16b342011-04-28 16:27:54 +0100565
566 armpmu->pmu = (struct pmu) {
567 .pmu_enable = armpmu_enable,
568 .pmu_disable = armpmu_disable,
569 .event_init = armpmu_event_init,
570 .add = armpmu_add,
571 .del = armpmu_del,
572 .start = armpmu_start,
573 .stop = armpmu_stop,
574 .read = armpmu_read,
Mark Rutlandc904e322015-05-13 17:12:26 +0100575 .filter_match = armpmu_filter_match,
Mark Rutland15896802016-09-09 14:08:29 +0100576 .attr_groups = armpmu->attr_groups,
Mark Rutland8a16b342011-04-28 16:27:54 +0100577 };
Mark Rutland48538b52016-09-09 14:08:30 +0100578 armpmu->attr_groups[ARMPMU_ATTR_GROUP_COMMON] =
579 &armpmu_common_attr_group;
Mark Rutland8a16b342011-04-28 16:27:54 +0100580}
581
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100582/* Set at runtime when we know what CPU type we are. */
583static struct arm_pmu *__oprofile_cpu_pmu;
584
585/*
586 * Despite the names, these two functions are CPU-specific and are used
587 * by the OProfile/perf code.
588 */
589const char *perf_pmu_name(void)
590{
591 if (!__oprofile_cpu_pmu)
592 return NULL;
593
594 return __oprofile_cpu_pmu->name;
595}
596EXPORT_SYMBOL_GPL(perf_pmu_name);
597
598int perf_num_counters(void)
599{
600 int max_events = 0;
601
602 if (__oprofile_cpu_pmu != NULL)
603 max_events = __oprofile_cpu_pmu->num_events;
604
605 return max_events;
606}
607EXPORT_SYMBOL_GPL(perf_num_counters);
608
609static void cpu_pmu_enable_percpu_irq(void *data)
610{
611 int irq = *(int *)data;
612
613 enable_percpu_irq(irq, IRQ_TYPE_NONE);
614}
615
616static void cpu_pmu_disable_percpu_irq(void *data)
617{
618 int irq = *(int *)data;
619
620 disable_percpu_irq(irq);
621}
622
623static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu)
624{
625 int i, irq, irqs;
626 struct platform_device *pmu_device = cpu_pmu->plat_device;
627 struct pmu_hw_events __percpu *hw_events = cpu_pmu->hw_events;
628
629 irqs = min(pmu_device->num_resources, num_possible_cpus());
630
631 irq = platform_get_irq(pmu_device, 0);
Marc Zyngier282b8792016-09-06 15:34:44 +0100632 if (irq > 0 && irq_is_percpu(irq)) {
Marc Zyngier19a469a2016-07-08 15:56:04 +0100633 on_each_cpu_mask(&cpu_pmu->supported_cpus,
634 cpu_pmu_disable_percpu_irq, &irq, 1);
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100635 free_percpu_irq(irq, &hw_events->percpu_pmu);
636 } else {
637 for (i = 0; i < irqs; ++i) {
638 int cpu = i;
639
640 if (cpu_pmu->irq_affinity)
641 cpu = cpu_pmu->irq_affinity[i];
642
643 if (!cpumask_test_and_clear_cpu(cpu, &cpu_pmu->active_irqs))
644 continue;
645 irq = platform_get_irq(pmu_device, i);
Marc Zyngier282b8792016-09-06 15:34:44 +0100646 if (irq > 0)
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100647 free_irq(irq, per_cpu_ptr(&hw_events->percpu_pmu, cpu));
648 }
649 }
650}
651
652static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)
653{
654 int i, err, irq, irqs;
655 struct platform_device *pmu_device = cpu_pmu->plat_device;
656 struct pmu_hw_events __percpu *hw_events = cpu_pmu->hw_events;
657
658 if (!pmu_device)
659 return -ENODEV;
660
661 irqs = min(pmu_device->num_resources, num_possible_cpus());
662 if (irqs < 1) {
663 pr_warn_once("perf/ARM: No irqs for PMU defined, sampling events not supported\n");
664 return 0;
665 }
666
667 irq = platform_get_irq(pmu_device, 0);
Marc Zyngier282b8792016-09-06 15:34:44 +0100668 if (irq > 0 && irq_is_percpu(irq)) {
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100669 err = request_percpu_irq(irq, handler, "arm-pmu",
670 &hw_events->percpu_pmu);
671 if (err) {
672 pr_err("unable to request IRQ%d for ARM PMU counters\n",
673 irq);
674 return err;
675 }
Marc Zyngier19a469a2016-07-08 15:56:04 +0100676
677 on_each_cpu_mask(&cpu_pmu->supported_cpus,
678 cpu_pmu_enable_percpu_irq, &irq, 1);
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100679 } else {
680 for (i = 0; i < irqs; ++i) {
681 int cpu = i;
682
683 err = 0;
684 irq = platform_get_irq(pmu_device, i);
685 if (irq < 0)
686 continue;
687
688 if (cpu_pmu->irq_affinity)
689 cpu = cpu_pmu->irq_affinity[i];
690
691 /*
692 * If we have a single PMU interrupt that we can't shift,
693 * assume that we're running on a uniprocessor machine and
694 * continue. Otherwise, continue without this interrupt.
695 */
696 if (irq_set_affinity(irq, cpumask_of(cpu)) && irqs > 1) {
697 pr_warn("unable to set irq affinity (irq=%d, cpu=%u)\n",
698 irq, cpu);
699 continue;
700 }
701
702 err = request_irq(irq, handler,
703 IRQF_NOBALANCING | IRQF_NO_THREAD, "arm-pmu",
704 per_cpu_ptr(&hw_events->percpu_pmu, cpu));
705 if (err) {
706 pr_err("unable to request IRQ%d for ARM PMU counters\n",
707 irq);
708 return err;
709 }
710
711 cpumask_set_cpu(cpu, &cpu_pmu->active_irqs);
712 }
713 }
714
715 return 0;
716}
717
718/*
719 * PMU hardware loses all context when a CPU goes offline.
720 * When a CPU is hotplugged back in, since some hardware registers are
721 * UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
722 * junk values out of them.
723 */
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +0200724static int arm_perf_starting_cpu(unsigned int cpu, struct hlist_node *node)
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100725{
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +0200726 struct arm_pmu *pmu = hlist_entry_safe(node, struct arm_pmu, node);
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100727
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +0200728 if (!cpumask_test_cpu(cpu, &pmu->supported_cpus))
729 return 0;
730 if (pmu->reset)
731 pmu->reset(pmu);
Thomas Gleixner7d88eb62016-07-13 17:16:36 +0000732 return 0;
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100733}
734
Lorenzo Pieralisida4e4f12016-02-23 18:22:39 +0000735#ifdef CONFIG_CPU_PM
736static void cpu_pm_pmu_setup(struct arm_pmu *armpmu, unsigned long cmd)
737{
738 struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
739 struct perf_event *event;
740 int idx;
741
742 for (idx = 0; idx < armpmu->num_events; idx++) {
743 /*
744 * If the counter is not used skip it, there is no
745 * need of stopping/restarting it.
746 */
747 if (!test_bit(idx, hw_events->used_mask))
748 continue;
749
750 event = hw_events->events[idx];
751
752 switch (cmd) {
753 case CPU_PM_ENTER:
754 /*
755 * Stop and update the counter
756 */
757 armpmu_stop(event, PERF_EF_UPDATE);
758 break;
759 case CPU_PM_EXIT:
760 case CPU_PM_ENTER_FAILED:
Lorenzo Pieralisicbcc72e2016-04-21 10:24:34 +0100761 /*
762 * Restore and enable the counter.
763 * armpmu_start() indirectly calls
764 *
765 * perf_event_update_userpage()
766 *
767 * that requires RCU read locking to be functional,
768 * wrap the call within RCU_NONIDLE to make the
769 * RCU subsystem aware this cpu is not idle from
770 * an RCU perspective for the armpmu_start() call
771 * duration.
772 */
773 RCU_NONIDLE(armpmu_start(event, PERF_EF_RELOAD));
Lorenzo Pieralisida4e4f12016-02-23 18:22:39 +0000774 break;
775 default:
776 break;
777 }
778 }
779}
780
781static int cpu_pm_pmu_notify(struct notifier_block *b, unsigned long cmd,
782 void *v)
783{
784 struct arm_pmu *armpmu = container_of(b, struct arm_pmu, cpu_pm_nb);
785 struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
786 int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
787
788 if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
789 return NOTIFY_DONE;
790
791 /*
792 * Always reset the PMU registers on power-up even if
793 * there are no events running.
794 */
795 if (cmd == CPU_PM_EXIT && armpmu->reset)
796 armpmu->reset(armpmu);
797
798 if (!enabled)
799 return NOTIFY_OK;
800
801 switch (cmd) {
802 case CPU_PM_ENTER:
803 armpmu->stop(armpmu);
804 cpu_pm_pmu_setup(armpmu, cmd);
805 break;
806 case CPU_PM_EXIT:
807 cpu_pm_pmu_setup(armpmu, cmd);
808 case CPU_PM_ENTER_FAILED:
809 armpmu->start(armpmu);
810 break;
811 default:
812 return NOTIFY_DONE;
813 }
814
815 return NOTIFY_OK;
816}
817
818static int cpu_pm_pmu_register(struct arm_pmu *cpu_pmu)
819{
820 cpu_pmu->cpu_pm_nb.notifier_call = cpu_pm_pmu_notify;
821 return cpu_pm_register_notifier(&cpu_pmu->cpu_pm_nb);
822}
823
824static void cpu_pm_pmu_unregister(struct arm_pmu *cpu_pmu)
825{
826 cpu_pm_unregister_notifier(&cpu_pmu->cpu_pm_nb);
827}
828#else
829static inline int cpu_pm_pmu_register(struct arm_pmu *cpu_pmu) { return 0; }
830static inline void cpu_pm_pmu_unregister(struct arm_pmu *cpu_pmu) { }
831#endif
832
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100833static int cpu_pmu_init(struct arm_pmu *cpu_pmu)
834{
835 int err;
836 int cpu;
837 struct pmu_hw_events __percpu *cpu_hw_events;
838
839 cpu_hw_events = alloc_percpu(struct pmu_hw_events);
840 if (!cpu_hw_events)
841 return -ENOMEM;
842
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +0200843 err = cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_STARTING,
844 &cpu_pmu->node);
845 if (err)
846 goto out_free;
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100847
Lorenzo Pieralisida4e4f12016-02-23 18:22:39 +0000848 err = cpu_pm_pmu_register(cpu_pmu);
849 if (err)
850 goto out_unregister;
851
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100852 for_each_possible_cpu(cpu) {
853 struct pmu_hw_events *events = per_cpu_ptr(cpu_hw_events, cpu);
854 raw_spin_lock_init(&events->pmu_lock);
855 events->percpu_pmu = cpu_pmu;
856 }
857
858 cpu_pmu->hw_events = cpu_hw_events;
859 cpu_pmu->request_irq = cpu_pmu_request_irq;
860 cpu_pmu->free_irq = cpu_pmu_free_irq;
861
862 /* Ensure the PMU has sane values out of reset. */
863 if (cpu_pmu->reset)
864 on_each_cpu_mask(&cpu_pmu->supported_cpus, cpu_pmu->reset,
865 cpu_pmu, 1);
866
867 /* If no interrupts available, set the corresponding capability flag */
868 if (!platform_get_irq(cpu_pmu->plat_device, 0))
869 cpu_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
870
Mark Rutland5101ef22016-04-26 11:33:46 +0100871 /*
872 * This is a CPU PMU potentially in a heterogeneous configuration (e.g.
873 * big.LITTLE). This is not an uncore PMU, and we have taken ctx
874 * sharing into account (e.g. with our pmu::filter_match callback and
875 * pmu::event_init group validation).
876 */
877 cpu_pmu->pmu.capabilities |= PERF_PMU_CAP_HETEROGENEOUS_CPUS;
878
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100879 return 0;
880
Lorenzo Pieralisida4e4f12016-02-23 18:22:39 +0000881out_unregister:
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +0200882 cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_STARTING,
883 &cpu_pmu->node);
884out_free:
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100885 free_percpu(cpu_hw_events);
886 return err;
887}
888
889static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu)
890{
Lorenzo Pieralisida4e4f12016-02-23 18:22:39 +0000891 cpu_pm_pmu_unregister(cpu_pmu);
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +0200892 cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_STARTING,
893 &cpu_pmu->node);
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100894 free_percpu(cpu_pmu->hw_events);
895}
896
897/*
898 * CPU PMU identification and probing.
899 */
900static int probe_current_pmu(struct arm_pmu *pmu,
901 const struct pmu_probe_info *info)
902{
903 int cpu = get_cpu();
904 unsigned int cpuid = read_cpuid_id();
905 int ret = -ENODEV;
906
907 pr_info("probing PMU on CPU %d\n", cpu);
908
909 for (; info->init != NULL; info++) {
910 if ((cpuid & info->mask) != info->cpuid)
911 continue;
912 ret = info->init(pmu);
913 break;
914 }
915
916 put_cpu();
917 return ret;
918}
919
920static int of_pmu_irq_cfg(struct arm_pmu *pmu)
921{
Will Deaconb6c084d2015-06-29 13:59:01 +0100922 int *irqs, i = 0;
923 bool using_spi = false;
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100924 struct platform_device *pdev = pmu->plat_device;
925
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100926 irqs = kcalloc(pdev->num_resources, sizeof(*irqs), GFP_KERNEL);
927 if (!irqs)
928 return -ENOMEM;
929
Will Deaconb6c084d2015-06-29 13:59:01 +0100930 do {
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100931 struct device_node *dn;
Will Deaconb6c084d2015-06-29 13:59:01 +0100932 int cpu, irq;
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100933
Will Deaconb6c084d2015-06-29 13:59:01 +0100934 /* See if we have an affinity entry */
935 dn = of_parse_phandle(pdev->dev.of_node, "interrupt-affinity", i);
936 if (!dn)
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100937 break;
Will Deaconb6c084d2015-06-29 13:59:01 +0100938
939 /* Check the IRQ type and prohibit a mix of PPIs and SPIs */
940 irq = platform_get_irq(pdev, i);
Marc Zyngier282b8792016-09-06 15:34:44 +0100941 if (irq > 0) {
Will Deaconb6c084d2015-06-29 13:59:01 +0100942 bool spi = !irq_is_percpu(irq);
943
944 if (i > 0 && spi != using_spi) {
945 pr_err("PPI/SPI IRQ type mismatch for %s!\n",
946 dn->name);
Stefan Wahren75324682016-08-27 16:19:49 +0000947 of_node_put(dn);
Will Deaconb6c084d2015-06-29 13:59:01 +0100948 kfree(irqs);
949 return -EINVAL;
950 }
951
952 using_spi = spi;
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100953 }
954
Will Deaconb6c084d2015-06-29 13:59:01 +0100955 /* Now look up the logical CPU number */
Will Deaconfb659882015-10-12 14:48:39 +0100956 for_each_possible_cpu(cpu) {
957 struct device_node *cpu_dn;
958
959 cpu_dn = of_cpu_device_node_get(cpu);
960 of_node_put(cpu_dn);
961
962 if (dn == cpu_dn)
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100963 break;
Will Deaconfb659882015-10-12 14:48:39 +0100964 }
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100965
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100966 if (cpu >= nr_cpu_ids) {
967 pr_warn("Failed to find logical CPU for %s\n",
968 dn->name);
Stephen Boyd8e0c34b2015-07-07 18:17:05 +0100969 of_node_put(dn);
Will Deaconb6c084d2015-06-29 13:59:01 +0100970 cpumask_setall(&pmu->supported_cpus);
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100971 break;
972 }
Stephen Boyd8e0c34b2015-07-07 18:17:05 +0100973 of_node_put(dn);
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100974
Will Deaconb6c084d2015-06-29 13:59:01 +0100975 /* For SPIs, we need to track the affinity per IRQ */
976 if (using_spi) {
Julien Grall121323a2016-05-31 12:41:21 +0100977 if (i >= pdev->num_resources)
Will Deaconb6c084d2015-06-29 13:59:01 +0100978 break;
Mark Rutland74cf0bc2015-05-26 17:23:39 +0100979
Will Deaconb6c084d2015-06-29 13:59:01 +0100980 irqs[i] = cpu;
981 }
982
983 /* Keep track of the CPUs containing this PMU type */
984 cpumask_set_cpu(cpu, &pmu->supported_cpus);
Will Deaconb6c084d2015-06-29 13:59:01 +0100985 i++;
986 } while (1);
987
Marc Zyngier19a469a2016-07-08 15:56:04 +0100988 /* If we didn't manage to parse anything, try the interrupt affinity */
989 if (cpumask_weight(&pmu->supported_cpus) == 0) {
Marc Zyngier7f1d6422016-07-19 15:39:02 +0100990 int irq = platform_get_irq(pdev, 0);
Marc Zyngier19a469a2016-07-08 15:56:04 +0100991
Marc Zyngier282b8792016-09-06 15:34:44 +0100992 if (irq > 0 && irq_is_percpu(irq)) {
Marc Zyngier7f1d6422016-07-19 15:39:02 +0100993 /* If using PPIs, check the affinity of the partition */
994 int ret;
995
Marc Zyngier19a469a2016-07-08 15:56:04 +0100996 ret = irq_get_percpu_devid_partition(irq, &pmu->supported_cpus);
997 if (ret) {
998 kfree(irqs);
999 return ret;
1000 }
1001 } else {
1002 /* Otherwise default to all CPUs */
1003 cpumask_setall(&pmu->supported_cpus);
1004 }
1005 }
Will Deaconb6c084d2015-06-29 13:59:01 +01001006
1007 /* If we matched up the IRQ affinities, use them to route the SPIs */
1008 if (using_spi && i == pdev->num_resources)
1009 pmu->irq_affinity = irqs;
1010 else
1011 kfree(irqs);
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001012
1013 return 0;
1014}
1015
1016int arm_pmu_device_probe(struct platform_device *pdev,
1017 const struct of_device_id *of_table,
1018 const struct pmu_probe_info *probe_table)
1019{
1020 const struct of_device_id *of_id;
1021 const int (*init_fn)(struct arm_pmu *);
1022 struct device_node *node = pdev->dev.of_node;
1023 struct arm_pmu *pmu;
1024 int ret = -ENODEV;
1025
1026 pmu = kzalloc(sizeof(struct arm_pmu), GFP_KERNEL);
1027 if (!pmu) {
1028 pr_info("failed to allocate PMU device!\n");
1029 return -ENOMEM;
1030 }
1031
Mark Rutlandb916b782015-10-28 12:32:17 +00001032 armpmu_init(pmu);
1033
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001034 pmu->plat_device = pdev;
1035
1036 if (node && (of_id = of_match_node(of_table, pdev->dev.of_node))) {
1037 init_fn = of_id->data;
1038
Martin Fuzzey8d1a0ae2016-01-13 23:36:26 -05001039 pmu->secure_access = of_property_read_bool(pdev->dev.of_node,
1040 "secure-reg-access");
1041
1042 /* arm64 systems boot only as non-secure */
1043 if (IS_ENABLED(CONFIG_ARM64) && pmu->secure_access) {
1044 pr_warn("ignoring \"secure-reg-access\" property for arm64\n");
1045 pmu->secure_access = false;
1046 }
1047
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001048 ret = of_pmu_irq_cfg(pmu);
1049 if (!ret)
1050 ret = init_fn(pmu);
Mark Salterdbee3a72016-09-14 17:32:29 -05001051 } else if (probe_table) {
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001052 cpumask_setall(&pmu->supported_cpus);
Mark Salterf7a6c142016-06-07 11:32:21 -05001053 ret = probe_current_pmu(pmu, probe_table);
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001054 }
1055
1056 if (ret) {
Will Deacon357b5652016-03-21 11:07:15 +00001057 pr_info("%s: failed to probe PMU!\n", of_node_full_name(node));
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001058 goto out_free;
1059 }
1060
Mark Rutland86cdd722016-09-09 14:08:26 +01001061
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001062 ret = cpu_pmu_init(pmu);
1063 if (ret)
1064 goto out_free;
1065
Mark Rutlandb916b782015-10-28 12:32:17 +00001066 ret = perf_pmu_register(&pmu->pmu, pmu->name, -1);
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001067 if (ret)
1068 goto out_destroy;
1069
Julien Grall0f254c72016-05-31 12:41:22 +01001070 if (!__oprofile_cpu_pmu)
1071 __oprofile_cpu_pmu = pmu;
1072
Mark Rutlandb916b782015-10-28 12:32:17 +00001073 pr_info("enabled with %s PMU driver, %d counters available\n",
1074 pmu->name, pmu->num_events);
1075
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001076 return 0;
1077
1078out_destroy:
1079 cpu_pmu_destroy(pmu);
1080out_free:
Will Deacon357b5652016-03-21 11:07:15 +00001081 pr_info("%s: failed to register PMU devices!\n",
1082 of_node_full_name(node));
Julien Grall5988a362016-05-31 12:41:23 +01001083 kfree(pmu->irq_affinity);
Mark Rutland74cf0bc2015-05-26 17:23:39 +01001084 kfree(pmu);
1085 return ret;
1086}
Sebastian Andrzej Siewior37b502f2016-07-20 09:51:11 +02001087
1088static int arm_pmu_hp_init(void)
1089{
1090 int ret;
1091
Sebastian Andrzej Siewior6e103c02016-08-17 19:14:20 +02001092 ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_STARTING,
1093 "AP_PERF_ARM_STARTING",
1094 arm_perf_starting_cpu, NULL);
Sebastian Andrzej Siewior37b502f2016-07-20 09:51:11 +02001095 if (ret)
1096 pr_err("CPU hotplug notifier for ARM PMU could not be registered: %d\n",
1097 ret);
1098 return ret;
1099}
1100subsys_initcall(arm_pmu_hp_init);