summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-imx/mmdc.c
blob: 3d76e8c28c51d4a9d7965398c15901ac9944d6bc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2017 NXP
 * Copyright 2011,2016 Freescale Semiconductor, Inc.
 * Copyright 2011 Linaro Ltd.
 */

#include <linux/clk.h>
#include <linux/hrtimer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/perf_event.h>
#include <linux/slab.h>

#include "common.h"

#define MMDC_MAPSR		0x404
#define BP_MMDC_MAPSR_PSD	0
#define BP_MMDC_MAPSR_PSS	4

#define MMDC_MDMISC		0x18
#define BM_MMDC_MDMISC_DDR_TYPE	0x18
#define BP_MMDC_MDMISC_DDR_TYPE	0x3

#define TOTAL_CYCLES		0x0
#define BUSY_CYCLES		0x1
#define READ_ACCESSES		0x2
#define WRITE_ACCESSES		0x3
#define READ_BYTES		0x4
#define WRITE_BYTES		0x5

/* Enables, resets, freezes, overflow profiling*/
#define DBG_DIS			0x0
#define DBG_EN			0x1
#define DBG_RST			0x2
#define PRF_FRZ			0x4
#define CYC_OVF			0x8
#define PROFILE_SEL		0x10

#define MMDC_MADPCR0	0x410
#define MMDC_MADPCR1	0x414
#define MMDC_MADPSR0	0x418
#define MMDC_MADPSR1	0x41C
#define MMDC_MADPSR2	0x420
#define MMDC_MADPSR3	0x424
#define MMDC_MADPSR4	0x428
#define MMDC_MADPSR5	0x42C

#define MMDC_NUM_COUNTERS	6

#define MMDC_FLAG_PROFILE_SEL	0x1
#define MMDC_PRF_AXI_ID_CLEAR	0x0

#define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)

static int ddr_type;

struct fsl_mmdc_devtype_data {
	unsigned int flags;
};

static const struct fsl_mmdc_devtype_data imx6q_data = {
};

static const struct fsl_mmdc_devtype_data imx6qp_data = {
	.flags = MMDC_FLAG_PROFILE_SEL,
};

static const struct of_device_id imx_mmdc_dt_ids[] = {
	{ .compatible = "fsl,imx6q-mmdc", .data = (void *)&imx6q_data},
	{ .compatible = "fsl,imx6qp-mmdc", .data = (void *)&imx6qp_data},
	{ /* sentinel */ }
};

#ifdef CONFIG_PERF_EVENTS

static enum cpuhp_state cpuhp_mmdc_state;
static DEFINE_IDA(mmdc_ida);

PMU_EVENT_ATTR_STRING(total-cycles, mmdc_pmu_total_cycles, "event=0x00")
PMU_EVENT_ATTR_STRING(busy-cycles, mmdc_pmu_busy_cycles, "event=0x01")
PMU_EVENT_ATTR_STRING(read-accesses, mmdc_pmu_read_accesses, "event=0x02")
PMU_EVENT_ATTR_STRING(write-accesses, mmdc_pmu_write_accesses, "event=0x03")
PMU_EVENT_ATTR_STRING(read-bytes, mmdc_pmu_read_bytes, "event=0x04")
PMU_EVENT_ATTR_STRING(read-bytes.unit, mmdc_pmu_read_bytes_unit, "MB");
PMU_EVENT_ATTR_STRING(read-bytes.scale, mmdc_pmu_read_bytes_scale, "0.000001");
PMU_EVENT_ATTR_STRING(write-bytes, mmdc_pmu_write_bytes, "event=0x05")
PMU_EVENT_ATTR_STRING(write-bytes.unit, mmdc_pmu_write_bytes_unit, "MB");
PMU_EVENT_ATTR_STRING(write-bytes.scale, mmdc_pmu_write_bytes_scale, "0.000001");

struct mmdc_pmu {
	struct pmu pmu;
	void __iomem *mmdc_base;
	cpumask_t cpu;
	struct hrtimer hrtimer;
	unsigned int active_events;
	int id;
	struct device *dev;
	struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
	struct hlist_node node;
	struct fsl_mmdc_devtype_data *devtype_data;
	struct clk *mmdc_ipg_clk;
};

/*
 * Polling period is set to one second, overflow of total-cycles (the fastest
 * increasing counter) takes ten seconds so one second is safe
 */
static unsigned int mmdc_pmu_poll_period_us = 1000000;

module_param_named(pmu_pmu_poll_period_us, mmdc_pmu_poll_period_us, uint,
		S_IRUGO | S_IWUSR);

static ktime_t mmdc_pmu_timer_period(void)
{
	return ns_to_ktime((u64)mmdc_pmu_poll_period_us * 1000);
}

static ssize_t mmdc_pmu_cpumask_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct mmdc_pmu *pmu_mmdc = dev_get_drvdata(dev);

	return cpumap_print_to_pagebuf(true, buf, &pmu_mmdc->cpu);
}

static struct device_attribute mmdc_pmu_cpumask_attr =
	__ATTR(cpumask, S_IRUGO, mmdc_pmu_cpumask_show, NULL);

static struct attribute *mmdc_pmu_cpumask_attrs[] = {
	&mmdc_pmu_cpumask_attr.attr,
	NULL,
};

static struct attribute_group mmdc_pmu_cpumask_attr_group = {
	.attrs = mmdc_pmu_cpumask_attrs,
};

static struct attribute *mmdc_pmu_events_attrs[] = {
	&mmdc_pmu_total_cycles.attr.attr,
	&mmdc_pmu_busy_cycles.attr.attr,
	&mmdc_pmu_read_accesses.attr.attr,
	&mmdc_pmu_write_accesses.attr.attr,
	&mmdc_pmu_read_bytes.attr.attr,
	&mmdc_pmu_read_bytes_unit.attr.attr,
	&mmdc_pmu_read_bytes_scale.attr.attr,
	&mmdc_pmu_write_bytes.attr.attr,
	&mmdc_pmu_write_bytes_unit.attr.attr,
	&mmdc_pmu_write_bytes_scale.attr.attr,
	NULL,
};

static struct attribute_group mmdc_pmu_events_attr_group = {
	.name = "events",
	.attrs = mmdc_pmu_events_attrs,
};

PMU_FORMAT_ATTR(event, "config:0-63");
PMU_FORMAT_ATTR(axi_id, "config1:0-63");

static struct attribute *mmdc_pmu_format_attrs[] = {
	&format_attr_event.attr,
	&format_attr_axi_id.attr,
	NULL,
};

static struct attribute_group mmdc_pmu_format_attr_group = {
	.name = "format",
	.attrs = mmdc_pmu_format_attrs,
};

static const struct attribute_group *attr_groups[] = {
	&mmdc_pmu_events_attr_group,
	&mmdc_pmu_format_attr_group,
	&mmdc_pmu_cpumask_attr_group,
	NULL,
};

static u32 mmdc_pmu_read_counter(struct mmdc_pmu *pmu_mmdc, int cfg)
{
	void __iomem *mmdc_base, *reg;

	mmdc_base = pmu_mmdc->mmdc_base;

	switch (cfg) {
	case TOTAL_CYCLES:
		reg = mmdc_base + MMDC_MADPSR0;
		break;
	case BUSY_CYCLES:
		reg = mmdc_base + MMDC_MADPSR1;
		break;
	case READ_ACCESSES:
		reg = mmdc_base + MMDC_MADPSR2;
		break;
	case WRITE_ACCESSES:
		reg = mmdc_base + MMDC_MADPSR3;
		break;
	case READ_BYTES:
		reg = mmdc_base + MMDC_MADPSR4;
		break;
	case WRITE_BYTES:
		reg = mmdc_base + MMDC_MADPSR5;
		break;
	default:
		return WARN_ONCE(1,
			"invalid configuration %d for mmdc counter", cfg);
	}
	return readl(reg);
}

static int mmdc_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
{
	struct mmdc_pmu *pmu_mmdc = hlist_entry_safe(node, struct mmdc_pmu, node);
	int target;

	if (!cpumask_test_and_clear_cpu(cpu, &pmu_mmdc->cpu))
		return 0;

	target = cpumask_any_but(cpu_online_mask, cpu);
	if (target >= nr_cpu_ids)
		return 0;

	perf_pmu_migrate_context(&pmu_mmdc->pmu, cpu, target);
	cpumask_set_cpu(target, &pmu_mmdc->cpu);

	return 0;
}

static bool mmdc_pmu_group_event_is_valid(struct perf_event *event,
					  struct pmu *pmu,
					  unsigned long *used_counters)
{
	int cfg = event->attr.config;

	if (is_software_event(event))
		return true;

	if (event->pmu != pmu)
		return false;

	return !test_and_set_bit(cfg, used_counters);
}

/*
 * Each event has a single fixed-purpose counter, so we can only have a
 * single active event for each at any point in time. Here we just check
 * for duplicates, and rely on mmdc_pmu_event_init to verify that the HW
 * event numbers are valid.
 */
static bool mmdc_pmu_group_is_valid(struct perf_event *event)
{
	struct pmu *pmu = event->pmu;
	struct perf_event *leader = event->group_leader;
	struct perf_event *sibling;
	unsigned long counter_mask = 0;

	set_bit(leader->attr.config, &counter_mask);

	if (event != leader) {
		if (!mmdc_pmu_group_event_is_valid(event, pmu, &counter_mask))
			return false;
	}

	for_each_sibling_event(sibling, leader) {
		if (!mmdc_pmu_group_event_is_valid(sibling, pmu, &counter_mask))
			return false;
	}

	return true;
}

static int mmdc_pmu_event_init(struct perf_event *event)
{
	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
	int cfg = event->attr.config;

	if (event->attr.type != event->pmu->type)
		return -ENOENT;

	if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
		return -EOPNOTSUPP;

	if (event->cpu < 0) {
		dev_warn(pmu_mmdc->dev, "Can't provide per-task data!\n");
		return -EOPNOTSUPP;
	}

	if (event->attr.sample_period)
		return -EINVAL;

	if (cfg < 0 || cfg >= MMDC_NUM_COUNTERS)
		return -EINVAL;

	if (!mmdc_pmu_group_is_valid(event))
		return -EINVAL;

	event->cpu = cpumask_first(&pmu_mmdc->cpu);
	return 0;
}

static void mmdc_pmu_event_update(struct perf_event *event)
{
	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
	struct hw_perf_event *hwc = &event->hw;
	u64 delta, prev_raw_count, new_raw_count;

	do {
		prev_raw_count = local64_read(&hwc->prev_count);
		new_raw_count = mmdc_pmu_read_counter(pmu_mmdc,
						      event->attr.config);
	} while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
		new_raw_count) != prev_raw_count);

	delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF;

	local64_add(delta, &event->count);
}

static void mmdc_pmu_event_start(struct perf_event *event, int flags)
{
	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
	struct hw_perf_event *hwc = &event->hw;
	void __iomem *mmdc_base, *reg;
	u32 val;

	mmdc_base = pmu_mmdc->mmdc_base;
	reg = mmdc_base + MMDC_MADPCR0;

	/*
	 * hrtimer is required because mmdc does not provide an interrupt so
	 * polling is necessary
	 */
	hrtimer_start(&pmu_mmdc->hrtimer, mmdc_pmu_timer_period(),
			HRTIMER_MODE_REL_PINNED);

	local64_set(&hwc->prev_count, 0);

	writel(DBG_RST, reg);

	/*
	 * Write the AXI id parameter to MADPCR1.
	 */
	val = event->attr.config1;
	reg = mmdc_base + MMDC_MADPCR1;
	writel(val, reg);

	reg = mmdc_base + MMDC_MADPCR0;
	val = DBG_EN;
	if (pmu_mmdc->devtype_data->flags & MMDC_FLAG_PROFILE_SEL)
		val |= PROFILE_SEL;

	writel(val, reg);
}

static int mmdc_pmu_event_add(struct perf_event *event, int flags)
{
	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
	struct hw_perf_event *hwc = &event->hw;

	int cfg = event->attr.config;

	if (flags & PERF_EF_START)
		mmdc_pmu_event_start(event, flags);

	if (pmu_mmdc->mmdc_events[cfg] != NULL)
		return -EAGAIN;

	pmu_mmdc->mmdc_events[cfg] = event;
	pmu_mmdc->active_events++;

	local64_set(&hwc->prev_count, mmdc_pmu_read_counter(pmu_mmdc, cfg));

	return 0;
}

static void mmdc_pmu_event_stop(struct perf_event *event, int flags)
{
	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
	void __iomem *mmdc_base, *reg;

	mmdc_base = pmu_mmdc->mmdc_base;
	reg = mmdc_base + MMDC_MADPCR0;

	writel(PRF_FRZ, reg);

	reg = mmdc_base + MMDC_MADPCR1;
	writel(MMDC_PRF_AXI_ID_CLEAR, reg);

	mmdc_pmu_event_update(event);
}

static void mmdc_pmu_event_del(struct perf_event *event, int flags)
{
	struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
	int cfg = event->attr.config;

	pmu_mmdc->mmdc_events[cfg] = NULL;
	pmu_mmdc->active_events--;

	if (pmu_mmdc->active_events == 0)
		hrtimer_cancel(&pmu_mmdc->hrtimer);

	mmdc_pmu_event_stop(event, PERF_EF_UPDATE);
}

static void mmdc_pmu_overflow_handler(struct mmdc_pmu *pmu_mmdc)
{
	int i;

	for (i = 0; i < MMDC_NUM_COUNTERS; i++) {
		struct perf_event *event = pmu_mmdc->mmdc_events[i];

		if (event)
			mmdc_pmu_event_update(event);
	}
}

static enum hrtimer_restart mmdc_pmu_timer_handler(struct hrtimer *hrtimer)
{
	struct mmdc_pmu *pmu_mmdc = container_of(hrtimer, struct mmdc_pmu,
			hrtimer);

	mmdc_pmu_overflow_handler(pmu_mmdc);
	hrtimer_forward_now(hrtimer, mmdc_pmu_timer_period());

	return HRTIMER_RESTART;
}

static int mmdc_pmu_init(struct mmdc_pmu *pmu_mmdc,
		void __iomem *mmdc_base, struct device *dev)
{
	*pmu_mmdc = (struct mmdc_pmu) {
		.pmu = (struct pmu) {
			.task_ctx_nr    = perf_invalid_context,
			.attr_groups    = attr_groups,
			.event_init     = mmdc_pmu_event_init,
			.add            = mmdc_pmu_event_add,
			.del            = mmdc_pmu_event_del,
			.start          = mmdc_pmu_event_start,
			.stop           = mmdc_pmu_event_stop,
			.read           = mmdc_pmu_event_update,
			.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
		},
		.mmdc_base = mmdc_base,
		.dev = dev,
		.active_events = 0,
	};

	pmu_mmdc->id = ida_simple_get(&mmdc_ida, 0, 0, GFP_KERNEL);

	return pmu_mmdc->id;
}

static int imx_mmdc_remove(struct platform_device *pdev)
{
	struct mmdc_pmu *pmu_mmdc = platform_get_drvdata(pdev);

	ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
	cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
	perf_pmu_unregister(&pmu_mmdc->pmu);
	iounmap(pmu_mmdc->mmdc_base);
	clk_disable_unprepare(pmu_mmdc->mmdc_ipg_clk);
	kfree(pmu_mmdc);
	return 0;
}

static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base,
			      struct clk *mmdc_ipg_clk)
{
	struct mmdc_pmu *pmu_mmdc;
	char *name;
	int ret;
	const struct of_device_id *of_id =
		of_match_device(imx_mmdc_dt_ids, &pdev->dev);

	pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL);
	if (!pmu_mmdc) {
		pr_err("failed to allocate PMU device!\n");
		return -ENOMEM;
	}

	/* The first instance registers the hotplug state */
	if (!cpuhp_mmdc_state) {
		ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
					      "perf/arm/mmdc:online", NULL,
					      mmdc_pmu_offline_cpu);
		if (ret < 0) {
			pr_err("cpuhp_setup_state_multi failed\n");
			goto pmu_free;
		}
		cpuhp_mmdc_state = ret;
	}

	ret = mmdc_pmu_init(pmu_mmdc, mmdc_base, &pdev->dev);
	if (ret < 0)
		goto  pmu_free;

	name = devm_kasprintf(&pdev->dev,
				GFP_KERNEL, "mmdc%d", ret);
	if (!name) {
		ret = -ENOMEM;
		goto pmu_release_id;
	}

	pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
	pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;

	hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC,
			HRTIMER_MODE_REL);
	pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler;

	cpumask_set_cpu(raw_smp_processor_id(), &pmu_mmdc->cpu);

	/* Register the pmu instance for cpu hotplug */
	cpuhp_state_add_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);

	ret = perf_pmu_register(&(pmu_mmdc->pmu), name, -1);
	if (ret)
		goto pmu_register_err;

	platform_set_drvdata(pdev, pmu_mmdc);
	return 0;

pmu_register_err:
	pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
	cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
	hrtimer_cancel(&pmu_mmdc->hrtimer);
pmu_release_id:
	ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
pmu_free:
	kfree(pmu_mmdc);
	return ret;
}

#else
#define imx_mmdc_remove NULL
#define imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk) 0
#endif

static int imx_mmdc_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	void __iomem *mmdc_base, *reg;
	struct clk *mmdc_ipg_clk;
	u32 val;
	int err;

	/* the ipg clock is optional */
	mmdc_ipg_clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(mmdc_ipg_clk))
		mmdc_ipg_clk = NULL;

	err = clk_prepare_enable(mmdc_ipg_clk);
	if (err) {
		dev_err(&pdev->dev, "Unable to enable mmdc ipg clock.\n");
		return err;
	}

	mmdc_base = of_iomap(np, 0);
	WARN_ON(!mmdc_base);

	reg = mmdc_base + MMDC_MDMISC;
	/* Get ddr type */
	val = readl_relaxed(reg);
	ddr_type = (val & BM_MMDC_MDMISC_DDR_TYPE) >>
		 BP_MMDC_MDMISC_DDR_TYPE;

	reg = mmdc_base + MMDC_MAPSR;

	/* Enable automatic power saving */
	val = readl_relaxed(reg);
	val &= ~(1 << BP_MMDC_MAPSR_PSD);
	writel_relaxed(val, reg);

	err = imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk);
	if (err) {
		iounmap(mmdc_base);
		clk_disable_unprepare(mmdc_ipg_clk);
	}

	return err;
}

int imx_mmdc_get_ddr_type(void)
{
	return ddr_type;
}

static struct platform_driver imx_mmdc_driver = {
	.driver		= {
		.name	= "imx-mmdc",
		.of_match_table = imx_mmdc_dt_ids,
	},
	.probe		= imx_mmdc_probe,
	.remove		= imx_mmdc_remove,
};

static int __init imx_mmdc_init(void)
{
	return platform_driver_register(&imx_mmdc_driver);
}
postcore_initcall(imx_mmdc_init);