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powerpc/mm: Drop the unnecessary region check
[linux-2.6-block.git] / drivers / perf / thunderx2_pmu.c
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69c32972
KG		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 * CAVIUM THUNDERX2 SoC PMU UNCORE
4 * Copyright (C) 2018 Cavium Inc.
5 * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
6 */
7
8#include <linux/acpi.h>
9#include <linux/cpuhotplug.h>
10#include <linux/perf_event.h>
11#include <linux/platform_device.h>
12
13/* Each ThunderX2(TX2) Socket has a L3C and DMC UNCORE PMU device.
14 * Each UNCORE PMU device consists of 4 independent programmable counters.
15 * Counters are 32 bit and do not support overflow interrupt,
16 * they need to be sampled before overflow(i.e, at every 2 seconds).
17 */
18
19#define TX2_PMU_MAX_COUNTERS 4
20#define TX2_PMU_DMC_CHANNELS 8
21#define TX2_PMU_L3_TILES 16
22
23#define TX2_PMU_HRTIMER_INTERVAL (2 * NSEC_PER_SEC)
24#define GET_EVENTID(ev) ((ev->hw.config) & 0x1f)
25#define GET_COUNTERID(ev) ((ev->hw.idx) & 0x3)
26 /* 1 byte per counter(4 counters).
27 * Event id is encoded in bits [5:1] of a byte,
28 */
29#define DMC_EVENT_CFG(idx, val) ((val) << (((idx) * 8) + 1))
30
31#define L3C_COUNTER_CTL 0xA8
32#define L3C_COUNTER_DATA 0xAC
33#define DMC_COUNTER_CTL 0x234
34#define DMC_COUNTER_DATA 0x240
35
36/* L3C event IDs */
37#define L3_EVENT_READ_REQ 0xD
38#define L3_EVENT_WRITEBACK_REQ 0xE
39#define L3_EVENT_INV_N_WRITE_REQ 0xF
40#define L3_EVENT_INV_REQ 0x10
41#define L3_EVENT_EVICT_REQ 0x13
42#define L3_EVENT_INV_N_WRITE_HIT 0x14
43#define L3_EVENT_INV_HIT 0x15
44#define L3_EVENT_READ_HIT 0x17
45#define L3_EVENT_MAX 0x18
46
47/* DMC event IDs */
48#define DMC_EVENT_COUNT_CYCLES 0x1
49#define DMC_EVENT_WRITE_TXNS 0xB
50#define DMC_EVENT_DATA_TRANSFERS 0xD
51#define DMC_EVENT_READ_TXNS 0xF
52#define DMC_EVENT_MAX 0x10
53
54enum tx2_uncore_type {
55 PMU_TYPE_L3C,
56 PMU_TYPE_DMC,
57 PMU_TYPE_INVALID,
58};
59
60/*
61 * pmu on each socket has 2 uncore devices(dmc and l3c),
62 * each device has 4 counters.
63 */
64struct tx2_uncore_pmu {
65 struct hlist_node hpnode;
66 struct list_head entry;
67 struct pmu pmu;
68 char *name;
69 int node;
70 int cpu;
71 u32 max_counters;
72 u32 prorate_factor;
73 u32 max_events;
74 u64 hrtimer_interval;
75 void __iomem *base;
76 DECLARE_BITMAP(active_counters, TX2_PMU_MAX_COUNTERS);
77 struct perf_event *events[TX2_PMU_MAX_COUNTERS];
78 struct device *dev;
79 struct hrtimer hrtimer;
80 const struct attribute_group **attr_groups;
81 enum tx2_uncore_type type;
82 void (*init_cntr_base)(struct perf_event *event,
83 struct tx2_uncore_pmu *tx2_pmu);
84 void (*stop_event)(struct perf_event *event);
85 void (*start_event)(struct perf_event *event, int flags);
86};
87
88static LIST_HEAD(tx2_pmus);
89
90static inline struct tx2_uncore_pmu *pmu_to_tx2_pmu(struct pmu *pmu)
91{
92 return container_of(pmu, struct tx2_uncore_pmu, pmu);
93}
94
95PMU_FORMAT_ATTR(event, "config:0-4");
96
97static struct attribute *l3c_pmu_format_attrs[] = {
98 &format_attr_event.attr,
99 NULL,
100};
101
102static struct attribute *dmc_pmu_format_attrs[] = {
103 &format_attr_event.attr,
104 NULL,
105};
106
107static const struct attribute_group l3c_pmu_format_attr_group = {
108 .name = "format",
109 .attrs = l3c_pmu_format_attrs,
110};
111
112static const struct attribute_group dmc_pmu_format_attr_group = {
113 .name = "format",
114 .attrs = dmc_pmu_format_attrs,
115};
116
117/*
118 * sysfs event attributes
119 */
120static ssize_t tx2_pmu_event_show(struct device *dev,
121 struct device_attribute *attr, char *buf)
122{
123 struct dev_ext_attribute *eattr;
124
125 eattr = container_of(attr, struct dev_ext_attribute, attr);
126 return sprintf(buf, "event=0x%lx\n", (unsigned long) eattr->var);
127}
128
129#define TX2_EVENT_ATTR(name, config) \
130 PMU_EVENT_ATTR(name, tx2_pmu_event_attr_##name, \
131 config, tx2_pmu_event_show)
132
133TX2_EVENT_ATTR(read_request, L3_EVENT_READ_REQ);
134TX2_EVENT_ATTR(writeback_request, L3_EVENT_WRITEBACK_REQ);
135TX2_EVENT_ATTR(inv_nwrite_request, L3_EVENT_INV_N_WRITE_REQ);
136TX2_EVENT_ATTR(inv_request, L3_EVENT_INV_REQ);
137TX2_EVENT_ATTR(evict_request, L3_EVENT_EVICT_REQ);
138TX2_EVENT_ATTR(inv_nwrite_hit, L3_EVENT_INV_N_WRITE_HIT);
139TX2_EVENT_ATTR(inv_hit, L3_EVENT_INV_HIT);
140TX2_EVENT_ATTR(read_hit, L3_EVENT_READ_HIT);
141
142static struct attribute *l3c_pmu_events_attrs[] = {
143 &tx2_pmu_event_attr_read_request.attr.attr,
144 &tx2_pmu_event_attr_writeback_request.attr.attr,
145 &tx2_pmu_event_attr_inv_nwrite_request.attr.attr,
146 &tx2_pmu_event_attr_inv_request.attr.attr,
147 &tx2_pmu_event_attr_evict_request.attr.attr,
148 &tx2_pmu_event_attr_inv_nwrite_hit.attr.attr,
149 &tx2_pmu_event_attr_inv_hit.attr.attr,
150 &tx2_pmu_event_attr_read_hit.attr.attr,
151 NULL,
152};
153
154TX2_EVENT_ATTR(cnt_cycles, DMC_EVENT_COUNT_CYCLES);
155TX2_EVENT_ATTR(write_txns, DMC_EVENT_WRITE_TXNS);
156TX2_EVENT_ATTR(data_transfers, DMC_EVENT_DATA_TRANSFERS);
157TX2_EVENT_ATTR(read_txns, DMC_EVENT_READ_TXNS);
158
159static struct attribute *dmc_pmu_events_attrs[] = {
160 &tx2_pmu_event_attr_cnt_cycles.attr.attr,
161 &tx2_pmu_event_attr_write_txns.attr.attr,
162 &tx2_pmu_event_attr_data_transfers.attr.attr,
163 &tx2_pmu_event_attr_read_txns.attr.attr,
164 NULL,
165};
166
167static const struct attribute_group l3c_pmu_events_attr_group = {
168 .name = "events",
169 .attrs = l3c_pmu_events_attrs,
170};
171
172static const struct attribute_group dmc_pmu_events_attr_group = {
173 .name = "events",
174 .attrs = dmc_pmu_events_attrs,
175};
176
177/*
178 * sysfs cpumask attributes
179 */
180static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
181 char *buf)
182{
183 struct tx2_uncore_pmu *tx2_pmu;
184
185 tx2_pmu = pmu_to_tx2_pmu(dev_get_drvdata(dev));
186 return cpumap_print_to_pagebuf(true, buf, cpumask_of(tx2_pmu->cpu));
187}
188static DEVICE_ATTR_RO(cpumask);
189
190static struct attribute *tx2_pmu_cpumask_attrs[] = {
191 &dev_attr_cpumask.attr,
192 NULL,
193};
194
195static const struct attribute_group pmu_cpumask_attr_group = {
196 .attrs = tx2_pmu_cpumask_attrs,
197};
198
199/*
200 * Per PMU device attribute groups
201 */
202static const struct attribute_group *l3c_pmu_attr_groups[] = {
203 &l3c_pmu_format_attr_group,
204 &pmu_cpumask_attr_group,
205 &l3c_pmu_events_attr_group,
206 NULL
207};
208
209static const struct attribute_group *dmc_pmu_attr_groups[] = {
210 &dmc_pmu_format_attr_group,
211 &pmu_cpumask_attr_group,
212 &dmc_pmu_events_attr_group,
213 NULL
214};
215
216static inline u32 reg_readl(unsigned long addr)
217{
218 return readl((void __iomem *)addr);
219}
220
221static inline void reg_writel(u32 val, unsigned long addr)
222{
223 writel(val, (void __iomem *)addr);
224}
225
226static int alloc_counter(struct tx2_uncore_pmu *tx2_pmu)
227{
228 int counter;
229
230 counter = find_first_zero_bit(tx2_pmu->active_counters,
231 tx2_pmu->max_counters);
232 if (counter == tx2_pmu->max_counters)
233 return -ENOSPC;
234
235 set_bit(counter, tx2_pmu->active_counters);
236 return counter;
237}
238
239static inline void free_counter(struct tx2_uncore_pmu *tx2_pmu, int counter)
240{
241 clear_bit(counter, tx2_pmu->active_counters);
242}
243
244static void init_cntr_base_l3c(struct perf_event *event,
245 struct tx2_uncore_pmu *tx2_pmu)
246{
247 struct hw_perf_event *hwc = &event->hw;
248
249 /* counter ctrl/data reg offset at 8 */
250 hwc->config_base = (unsigned long)tx2_pmu->base
251 + L3C_COUNTER_CTL + (8 * GET_COUNTERID(event));
252 hwc->event_base = (unsigned long)tx2_pmu->base
253 + L3C_COUNTER_DATA + (8 * GET_COUNTERID(event));
254}
255
256static void init_cntr_base_dmc(struct perf_event *event,
257 struct tx2_uncore_pmu *tx2_pmu)
258{
259 struct hw_perf_event *hwc = &event->hw;
260
261 hwc->config_base = (unsigned long)tx2_pmu->base
262 + DMC_COUNTER_CTL;
263 /* counter data reg offset at 0xc */
264 hwc->event_base = (unsigned long)tx2_pmu->base
265 + DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event));
266}
267
268static void uncore_start_event_l3c(struct perf_event *event, int flags)
269{
270 u32 val;
271 struct hw_perf_event *hwc = &event->hw;
272
273 /* event id encoded in bits [07:03] */
274 val = GET_EVENTID(event) << 3;
275 reg_writel(val, hwc->config_base);
276 local64_set(&hwc->prev_count, 0);
277 reg_writel(0, hwc->event_base);
278}
279
280static inline void uncore_stop_event_l3c(struct perf_event *event)
281{
282 reg_writel(0, event->hw.config_base);
283}
284
285static void uncore_start_event_dmc(struct perf_event *event, int flags)
286{
287 u32 val;
288 struct hw_perf_event *hwc = &event->hw;
289 int idx = GET_COUNTERID(event);
290 int event_id = GET_EVENTID(event);
291
292 /* enable and start counters.
293 * 8 bits for each counter, bits[05:01] of a counter to set event type.
294 */
295 val = reg_readl(hwc->config_base);
296 val &= ~DMC_EVENT_CFG(idx, 0x1f);
297 val |= DMC_EVENT_CFG(idx, event_id);
298 reg_writel(val, hwc->config_base);
299 local64_set(&hwc->prev_count, 0);
300 reg_writel(0, hwc->event_base);
301}
302
303static void uncore_stop_event_dmc(struct perf_event *event)
304{
305 u32 val;
306 struct hw_perf_event *hwc = &event->hw;
307 int idx = GET_COUNTERID(event);
308
309 /* clear event type(bits[05:01]) to stop counter */
310 val = reg_readl(hwc->config_base);
311 val &= ~DMC_EVENT_CFG(idx, 0x1f);
312 reg_writel(val, hwc->config_base);
313}
314
315static void tx2_uncore_event_update(struct perf_event *event)
316{
317 s64 prev, delta, new = 0;
318 struct hw_perf_event *hwc = &event->hw;
319 struct tx2_uncore_pmu *tx2_pmu;
320 enum tx2_uncore_type type;
321 u32 prorate_factor;
322
323 tx2_pmu = pmu_to_tx2_pmu(event->pmu);
324 type = tx2_pmu->type;
325 prorate_factor = tx2_pmu->prorate_factor;
326
327 new = reg_readl(hwc->event_base);
328 prev = local64_xchg(&hwc->prev_count, new);
329
330 /* handles rollover of 32 bit counter */
331 delta = (u32)(((1UL << 32) - prev) + new);
332
333 /* DMC event data_transfers granularity is 16 Bytes, convert it to 64 */
334 if (type == PMU_TYPE_DMC &&
335 GET_EVENTID(event) == DMC_EVENT_DATA_TRANSFERS)
336 delta = delta/4;
337
338 /* L3C and DMC has 16 and 8 interleave channels respectively.
339 * The sampled value is for channel 0 and multiplied with
340 * prorate_factor to get the count for a device.
341 */
342 local64_add(delta * prorate_factor, &event->count);
343}
344
345static enum tx2_uncore_type get_tx2_pmu_type(struct acpi_device *adev)
346{
347 int i = 0;
348 struct acpi_tx2_pmu_device {
349 __u8 id[ACPI_ID_LEN];
350 enum tx2_uncore_type type;
351 } devices[] = {
352 {"CAV901D", PMU_TYPE_L3C},
353 {"CAV901F", PMU_TYPE_DMC},
354 {"", PMU_TYPE_INVALID}
355 };
356
357 while (devices[i].type != PMU_TYPE_INVALID) {
358 if (!strcmp(acpi_device_hid(adev), devices[i].id))
359 break;
360 i++;
361 }
362
363 return devices[i].type;
364}
365
366static bool tx2_uncore_validate_event(struct pmu *pmu,
367 struct perf_event *event, int *counters)
368{
369 if (is_software_event(event))
370 return true;
371 /* Reject groups spanning multiple HW PMUs. */
372 if (event->pmu != pmu)
373 return false;
374
375 *counters = *counters + 1;
376 return true;
377}
378
379/*
380 * Make sure the group of events can be scheduled at once
381 * on the PMU.
382 */
383static bool tx2_uncore_validate_event_group(struct perf_event *event)
384{
385 struct perf_event *sibling, *leader = event->group_leader;
386 int counters = 0;
387
388 if (event->group_leader == event)
389 return true;
390
391 if (!tx2_uncore_validate_event(event->pmu, leader, &counters))
392 return false;
393
394 for_each_sibling_event(sibling, leader) {
395 if (!tx2_uncore_validate_event(event->pmu, sibling, &counters))
396 return false;
397 }
398
399 if (!tx2_uncore_validate_event(event->pmu, event, &counters))
400 return false;
401
402 /*
403 * If the group requires more counters than the HW has,
404 * it cannot ever be scheduled.
405 */
406 return counters <= TX2_PMU_MAX_COUNTERS;
407}
408
409
410static int tx2_uncore_event_init(struct perf_event *event)
411{
412 struct hw_perf_event *hwc = &event->hw;
413 struct tx2_uncore_pmu *tx2_pmu;
414
415 /* Test the event attr type check for PMU enumeration */
416 if (event->attr.type != event->pmu->type)
417 return -ENOENT;
418
419 /*
420 * SOC PMU counters are shared across all cores.
421 * Therefore, it does not support per-process mode.
422 * Also, it does not support event sampling mode.
423 */
424 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
425 return -EINVAL;
426
69c32972
KG		 427 if (event->cpu < 0)
428 return -EINVAL;
429
430 tx2_pmu = pmu_to_tx2_pmu(event->pmu);
431 if (tx2_pmu->cpu >= nr_cpu_ids)
432 return -EINVAL;
433 event->cpu = tx2_pmu->cpu;
434
435 if (event->attr.config >= tx2_pmu->max_events)
436 return -EINVAL;
437
438 /* store event id */
439 hwc->config = event->attr.config;
440
441 /* Validate the group */
442 if (!tx2_uncore_validate_event_group(event))
443 return -EINVAL;
444
445 return 0;
446}
447
448static void tx2_uncore_event_start(struct perf_event *event, int flags)
449{
450 struct hw_perf_event *hwc = &event->hw;
451 struct tx2_uncore_pmu *tx2_pmu;
452
453 hwc->state = 0;
454 tx2_pmu = pmu_to_tx2_pmu(event->pmu);
455
456 tx2_pmu->start_event(event, flags);
457 perf_event_update_userpage(event);
458
459 /* Start timer for first event */
460 if (bitmap_weight(tx2_pmu->active_counters,
461 tx2_pmu->max_counters) == 1) {
462 hrtimer_start(&tx2_pmu->hrtimer,
463 ns_to_ktime(tx2_pmu->hrtimer_interval),
464 HRTIMER_MODE_REL_PINNED);
465 }
466}
467
468static void tx2_uncore_event_stop(struct perf_event *event, int flags)
469{
470 struct hw_perf_event *hwc = &event->hw;
471 struct tx2_uncore_pmu *tx2_pmu;
472
473 if (hwc->state & PERF_HES_UPTODATE)
474 return;
475
476 tx2_pmu = pmu_to_tx2_pmu(event->pmu);
477 tx2_pmu->stop_event(event);
478 WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
479 hwc->state |= PERF_HES_STOPPED;
480 if (flags & PERF_EF_UPDATE) {
481 tx2_uncore_event_update(event);
482 hwc->state |= PERF_HES_UPTODATE;
483 }
484}
485
486static int tx2_uncore_event_add(struct perf_event *event, int flags)
487{
488 struct hw_perf_event *hwc = &event->hw;
489 struct tx2_uncore_pmu *tx2_pmu;
490
491 tx2_pmu = pmu_to_tx2_pmu(event->pmu);
492
493 /* Allocate a free counter */
494 hwc->idx = alloc_counter(tx2_pmu);
495 if (hwc->idx < 0)
496 return -EAGAIN;
497
498 tx2_pmu->events[hwc->idx] = event;
499 /* set counter control and data registers base address */
500 tx2_pmu->init_cntr_base(event, tx2_pmu);
501
502 hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
503 if (flags & PERF_EF_START)
504 tx2_uncore_event_start(event, flags);
505
506 return 0;
507}
508
509static void tx2_uncore_event_del(struct perf_event *event, int flags)
510{
511 struct tx2_uncore_pmu *tx2_pmu = pmu_to_tx2_pmu(event->pmu);
512 struct hw_perf_event *hwc = &event->hw;
513
514 tx2_uncore_event_stop(event, PERF_EF_UPDATE);
515
516 /* clear the assigned counter */
517 free_counter(tx2_pmu, GET_COUNTERID(event));
518
519 perf_event_update_userpage(event);
520 tx2_pmu->events[hwc->idx] = NULL;
521 hwc->idx = -1;
522}
523
524static void tx2_uncore_event_read(struct perf_event *event)
525{
526 tx2_uncore_event_update(event);
527}
528
529static enum hrtimer_restart tx2_hrtimer_callback(struct hrtimer *timer)
530{
531 struct tx2_uncore_pmu *tx2_pmu;
532 int max_counters, idx;
533
534 tx2_pmu = container_of(timer, struct tx2_uncore_pmu, hrtimer);
535 max_counters = tx2_pmu->max_counters;
536
537 if (bitmap_empty(tx2_pmu->active_counters, max_counters))
538 return HRTIMER_NORESTART;
539
540 for_each_set_bit(idx, tx2_pmu->active_counters, max_counters) {
541 struct perf_event *event = tx2_pmu->events[idx];
542
543 tx2_uncore_event_update(event);
544 }
545 hrtimer_forward_now(timer, ns_to_ktime(tx2_pmu->hrtimer_interval));
546 return HRTIMER_RESTART;
547}
548
549static int tx2_uncore_pmu_register(
550 struct tx2_uncore_pmu *tx2_pmu)
551{
552 struct device *dev = tx2_pmu->dev;
553 char *name = tx2_pmu->name;
554
555 /* Perf event registration */
556 tx2_pmu->pmu = (struct pmu) {
557 .module = THIS_MODULE,
558 .attr_groups = tx2_pmu->attr_groups,
559 .task_ctx_nr = perf_invalid_context,
560 .event_init = tx2_uncore_event_init,
561 .add = tx2_uncore_event_add,
562 .del = tx2_uncore_event_del,
563 .start = tx2_uncore_event_start,
564 .stop = tx2_uncore_event_stop,
565 .read = tx2_uncore_event_read,
30656398 566 .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
69c32972
KG		 567 };
568
569 tx2_pmu->pmu.name = devm_kasprintf(dev, GFP_KERNEL,
570 "%s", name);
571
572 return perf_pmu_register(&tx2_pmu->pmu, tx2_pmu->pmu.name, -1);
573}
574
575static int tx2_uncore_pmu_add_dev(struct tx2_uncore_pmu *tx2_pmu)
576{
577 int ret, cpu;
578
579 cpu = cpumask_any_and(cpumask_of_node(tx2_pmu->node),
580 cpu_online_mask);
581
582 tx2_pmu->cpu = cpu;
583 hrtimer_init(&tx2_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
584 tx2_pmu->hrtimer.function = tx2_hrtimer_callback;
585
586 ret = tx2_uncore_pmu_register(tx2_pmu);
587 if (ret) {
588 dev_err(tx2_pmu->dev, "%s PMU: Failed to init driver\n",
589 tx2_pmu->name);
590 return -ENODEV;
591 }
592
593 /* register hotplug callback for the pmu */
594 ret = cpuhp_state_add_instance(
595 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
596 &tx2_pmu->hpnode);
597 if (ret) {
598 dev_err(tx2_pmu->dev, "Error %d registering hotplug", ret);
599 return ret;
600 }
601
602 /* Add to list */
603 list_add(&tx2_pmu->entry, &tx2_pmus);
604
605 dev_dbg(tx2_pmu->dev, "%s PMU UNCORE registered\n",
606 tx2_pmu->pmu.name);
607 return ret;
608}
609
610static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
611 acpi_handle handle, struct acpi_device *adev, u32 type)
612{
613 struct tx2_uncore_pmu *tx2_pmu;
614 void __iomem *base;
615 struct resource res;
616 struct resource_entry *rentry;
617 struct list_head list;
618 int ret;
619
620 INIT_LIST_HEAD(&list);
621 ret = acpi_dev_get_resources(adev, &list, NULL, NULL);
622 if (ret <= 0) {
623 dev_err(dev, "failed to parse _CRS method, error %d\n", ret);
624 return NULL;
625 }
626
627 list_for_each_entry(rentry, &list, node) {
628 if (resource_type(rentry->res) == IORESOURCE_MEM) {
629 res = *rentry->res;
630 break;
631 }
632 }
633
634 if (!rentry->res)
635 return NULL;
636
637 acpi_dev_free_resource_list(&list);
638 base = devm_ioremap_resource(dev, &res);
639 if (IS_ERR(base)) {
640 dev_err(dev, "PMU type %d: Fail to map resource\n", type);
641 return NULL;
642 }
643
644 tx2_pmu = devm_kzalloc(dev, sizeof(*tx2_pmu), GFP_KERNEL);
645 if (!tx2_pmu)
646 return NULL;
647
648 tx2_pmu->dev = dev;
649 tx2_pmu->type = type;
650 tx2_pmu->base = base;
651 tx2_pmu->node = dev_to_node(dev);
652 INIT_LIST_HEAD(&tx2_pmu->entry);
653
654 switch (tx2_pmu->type) {
655 case PMU_TYPE_L3C:
656 tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
657 tx2_pmu->prorate_factor = TX2_PMU_L3_TILES;
658 tx2_pmu->max_events = L3_EVENT_MAX;
659 tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
660 tx2_pmu->attr_groups = l3c_pmu_attr_groups;
661 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
662 "uncore_l3c_%d", tx2_pmu->node);
663 tx2_pmu->init_cntr_base = init_cntr_base_l3c;
664 tx2_pmu->start_event = uncore_start_event_l3c;
665 tx2_pmu->stop_event = uncore_stop_event_l3c;
666 break;
667 case PMU_TYPE_DMC:
668 tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
669 tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
670 tx2_pmu->max_events = DMC_EVENT_MAX;
671 tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
672 tx2_pmu->attr_groups = dmc_pmu_attr_groups;
673 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
674 "uncore_dmc_%d", tx2_pmu->node);
675 tx2_pmu->init_cntr_base = init_cntr_base_dmc;
676 tx2_pmu->start_event = uncore_start_event_dmc;
677 tx2_pmu->stop_event = uncore_stop_event_dmc;
678 break;
679 case PMU_TYPE_INVALID:
680 devm_kfree(dev, tx2_pmu);
681 return NULL;
682 }
683
684 return tx2_pmu;
685}
686
687static acpi_status tx2_uncore_pmu_add(acpi_handle handle, u32 level,
688 void *data, void **return_value)
689{
690 struct tx2_uncore_pmu *tx2_pmu;
691 struct acpi_device *adev;
692 enum tx2_uncore_type type;
693
694 if (acpi_bus_get_device(handle, &adev))
695 return AE_OK;
696 if (acpi_bus_get_status(adev) || !adev->status.present)
697 return AE_OK;
698
699 type = get_tx2_pmu_type(adev);
700 if (type == PMU_TYPE_INVALID)
701 return AE_OK;
702
703 tx2_pmu = tx2_uncore_pmu_init_dev((struct device *)data,
704 handle, adev, type);
705
706 if (!tx2_pmu)
707 return AE_ERROR;
708
709 if (tx2_uncore_pmu_add_dev(tx2_pmu)) {
710 /* Can't add the PMU device, abort */
711 return AE_ERROR;
712 }
713 return AE_OK;
714}
715
716static int tx2_uncore_pmu_online_cpu(unsigned int cpu,
717 struct hlist_node *hpnode)
718{
719 struct tx2_uncore_pmu *tx2_pmu;
720
721 tx2_pmu = hlist_entry_safe(hpnode,
722 struct tx2_uncore_pmu, hpnode);
723
724 /* Pick this CPU, If there is no CPU/PMU association and both are
725 * from same node.
726 */
727 if ((tx2_pmu->cpu >= nr_cpu_ids) &&
728 (tx2_pmu->node == cpu_to_node(cpu)))
729 tx2_pmu->cpu = cpu;
730
731 return 0;
732}
733
734static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
735 struct hlist_node *hpnode)
736{
737 int new_cpu;
738 struct tx2_uncore_pmu *tx2_pmu;
739 struct cpumask cpu_online_mask_temp;
740
741 tx2_pmu = hlist_entry_safe(hpnode,
742 struct tx2_uncore_pmu, hpnode);
743
744 if (cpu != tx2_pmu->cpu)
745 return 0;
746
747 hrtimer_cancel(&tx2_pmu->hrtimer);
748 cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
749 cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
750 new_cpu = cpumask_any_and(
751 cpumask_of_node(tx2_pmu->node),
752 &cpu_online_mask_temp);
753
754 tx2_pmu->cpu = new_cpu;
755 if (new_cpu >= nr_cpu_ids)
756 return 0;
757 perf_pmu_migrate_context(&tx2_pmu->pmu, cpu, new_cpu);
758
759 return 0;
760}
761
762static const struct acpi_device_id tx2_uncore_acpi_match[] = {
763 {"CAV901C", 0},
764 {},
765};
766MODULE_DEVICE_TABLE(acpi, tx2_uncore_acpi_match);
767
768static int tx2_uncore_probe(struct platform_device *pdev)
769{
770 struct device *dev = &pdev->dev;
771 acpi_handle handle;
772 acpi_status status;
773
774 set_dev_node(dev, acpi_get_node(ACPI_HANDLE(dev)));
775
776 if (!has_acpi_companion(dev))
777 return -ENODEV;
778
779 handle = ACPI_HANDLE(dev);
780 if (!handle)
781 return -EINVAL;
782
783 /* Walk through the tree for all PMU UNCORE devices */
784 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
785 tx2_uncore_pmu_add,
786 NULL, dev, NULL);
787 if (ACPI_FAILURE(status)) {
788 dev_err(dev, "failed to probe PMU devices\n");
789 return_ACPI_STATUS(status);
790 }
791
792 dev_info(dev, "node%d: pmu uncore registered\n", dev_to_node(dev));
793 return 0;
794}
795
796static int tx2_uncore_remove(struct platform_device *pdev)
797{
798 struct tx2_uncore_pmu *tx2_pmu, *temp;
799 struct device *dev = &pdev->dev;
800
801 if (!list_empty(&tx2_pmus)) {
802 list_for_each_entry_safe(tx2_pmu, temp, &tx2_pmus, entry) {
803 if (tx2_pmu->node == dev_to_node(dev)) {
804 cpuhp_state_remove_instance_nocalls(
805 CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
806 &tx2_pmu->hpnode);
807 perf_pmu_unregister(&tx2_pmu->pmu);
808 list_del(&tx2_pmu->entry);
809 }
810 }
811 }
812 return 0;
813}
814
815static struct platform_driver tx2_uncore_driver = {
816 .driver = {
817 .name = "tx2-uncore-pmu",
818 .acpi_match_table = ACPI_PTR(tx2_uncore_acpi_match),
819 },
820 .probe = tx2_uncore_probe,
821 .remove = tx2_uncore_remove,
822};
823
824static int __init tx2_uncore_driver_init(void)
825{
826 int ret;
827
828 ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
829 "perf/tx2/uncore:online",
830 tx2_uncore_pmu_online_cpu,
831 tx2_uncore_pmu_offline_cpu);
832 if (ret) {
833 pr_err("TX2 PMU: setup hotplug failed(%d)\n", ret);
834 return ret;
835 }
836 ret = platform_driver_register(&tx2_uncore_driver);
837 if (ret)
838 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
839
840 return ret;
841}
842module_init(tx2_uncore_driver_init);
843
844static void __exit tx2_uncore_driver_exit(void)
845{
846 platform_driver_unregister(&tx2_uncore_driver);
847 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
848}
849module_exit(tx2_uncore_driver_exit);
850
851MODULE_DESCRIPTION("ThunderX2 UNCORE PMU driver");
852MODULE_LICENSE("GPL v2");
853MODULE_AUTHOR("Ganapatrao Kulkarni <gkulkarni@cavium.com>");
Linux 6.x block layer and io_uring tree(s)