1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright 2011,2016 Freescale Semiconductor, Inc.
5 * Copyright 2011 Linaro Ltd.
9 #include <linux/hrtimer.h>
10 #include <linux/init.h>
11 #include <linux/interrupt.h>
13 #include <linux/module.h>
15 #include <linux/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/perf_event.h>
18 #include <linux/slab.h>
22 #define MMDC_MAPSR 0x404
23 #define BP_MMDC_MAPSR_PSD 0
24 #define BP_MMDC_MAPSR_PSS 4
26 #define MMDC_MDMISC 0x18
27 #define BM_MMDC_MDMISC_DDR_TYPE 0x18
28 #define BP_MMDC_MDMISC_DDR_TYPE 0x3
30 #define TOTAL_CYCLES 0x0
31 #define BUSY_CYCLES 0x1
32 #define READ_ACCESSES 0x2
33 #define WRITE_ACCESSES 0x3
34 #define READ_BYTES 0x4
35 #define WRITE_BYTES 0x5
37 /* Enables, resets, freezes, overflow profiling*/
43 #define PROFILE_SEL 0x10
45 #define MMDC_MADPCR0 0x410
46 #define MMDC_MADPCR1 0x414
47 #define MMDC_MADPSR0 0x418
48 #define MMDC_MADPSR1 0x41C
49 #define MMDC_MADPSR2 0x420
50 #define MMDC_MADPSR3 0x424
51 #define MMDC_MADPSR4 0x428
52 #define MMDC_MADPSR5 0x42C
54 #define MMDC_NUM_COUNTERS 6
56 #define MMDC_FLAG_PROFILE_SEL 0x1
57 #define MMDC_PRF_AXI_ID_CLEAR 0x0
59 #define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu)
63 struct fsl_mmdc_devtype_data {
67 static const struct fsl_mmdc_devtype_data imx6q_data = {
70 static const struct fsl_mmdc_devtype_data imx6qp_data = {
71 .flags = MMDC_FLAG_PROFILE_SEL,
74 static const struct of_device_id imx_mmdc_dt_ids[] = {
75 { .compatible = "fsl,imx6q-mmdc", .data = (void *)&imx6q_data},
76 { .compatible = "fsl,imx6qp-mmdc", .data = (void *)&imx6qp_data},
80 #ifdef CONFIG_PERF_EVENTS
82 static enum cpuhp_state cpuhp_mmdc_state;
83 static DEFINE_IDA(mmdc_ida);
85 PMU_EVENT_ATTR_STRING(total-cycles, mmdc_pmu_total_cycles, "event=0x00")
86 PMU_EVENT_ATTR_STRING(busy-cycles, mmdc_pmu_busy_cycles, "event=0x01")
87 PMU_EVENT_ATTR_STRING(read-accesses, mmdc_pmu_read_accesses, "event=0x02")
88 PMU_EVENT_ATTR_STRING(write-accesses, mmdc_pmu_write_accesses, "event=0x03")
89 PMU_EVENT_ATTR_STRING(read-bytes, mmdc_pmu_read_bytes, "event=0x04")
90 PMU_EVENT_ATTR_STRING(read-bytes.unit, mmdc_pmu_read_bytes_unit, "MB");
91 PMU_EVENT_ATTR_STRING(read-bytes.scale, mmdc_pmu_read_bytes_scale, "0.000001");
92 PMU_EVENT_ATTR_STRING(write-bytes, mmdc_pmu_write_bytes, "event=0x05")
93 PMU_EVENT_ATTR_STRING(write-bytes.unit, mmdc_pmu_write_bytes_unit, "MB");
94 PMU_EVENT_ATTR_STRING(write-bytes.scale, mmdc_pmu_write_bytes_scale, "0.000001");
98 void __iomem *mmdc_base;
100 struct hrtimer hrtimer;
101 unsigned int active_events;
104 struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
105 struct hlist_node node;
106 struct fsl_mmdc_devtype_data *devtype_data;
107 struct clk *mmdc_ipg_clk;
111 * Polling period is set to one second, overflow of total-cycles (the fastest
112 * increasing counter) takes ten seconds so one second is safe
114 static unsigned int mmdc_pmu_poll_period_us = 1000000;
116 module_param_named(pmu_pmu_poll_period_us, mmdc_pmu_poll_period_us, uint,
119 static ktime_t mmdc_pmu_timer_period(void)
121 return ns_to_ktime((u64)mmdc_pmu_poll_period_us * 1000);
124 static ssize_t mmdc_pmu_cpumask_show(struct device *dev,
125 struct device_attribute *attr, char *buf)
127 struct mmdc_pmu *pmu_mmdc = dev_get_drvdata(dev);
129 return cpumap_print_to_pagebuf(true, buf, &pmu_mmdc->cpu);
132 static struct device_attribute mmdc_pmu_cpumask_attr =
133 __ATTR(cpumask, S_IRUGO, mmdc_pmu_cpumask_show, NULL);
135 static struct attribute *mmdc_pmu_cpumask_attrs[] = {
136 &mmdc_pmu_cpumask_attr.attr,
140 static struct attribute_group mmdc_pmu_cpumask_attr_group = {
141 .attrs = mmdc_pmu_cpumask_attrs,
144 static struct attribute *mmdc_pmu_events_attrs[] = {
145 &mmdc_pmu_total_cycles.attr.attr,
146 &mmdc_pmu_busy_cycles.attr.attr,
147 &mmdc_pmu_read_accesses.attr.attr,
148 &mmdc_pmu_write_accesses.attr.attr,
149 &mmdc_pmu_read_bytes.attr.attr,
150 &mmdc_pmu_read_bytes_unit.attr.attr,
151 &mmdc_pmu_read_bytes_scale.attr.attr,
152 &mmdc_pmu_write_bytes.attr.attr,
153 &mmdc_pmu_write_bytes_unit.attr.attr,
154 &mmdc_pmu_write_bytes_scale.attr.attr,
158 static struct attribute_group mmdc_pmu_events_attr_group = {
160 .attrs = mmdc_pmu_events_attrs,
163 PMU_FORMAT_ATTR(event, "config:0-63");
164 PMU_FORMAT_ATTR(axi_id, "config1:0-63");
166 static struct attribute *mmdc_pmu_format_attrs[] = {
167 &format_attr_event.attr,
168 &format_attr_axi_id.attr,
172 static struct attribute_group mmdc_pmu_format_attr_group = {
174 .attrs = mmdc_pmu_format_attrs,
177 static const struct attribute_group *attr_groups[] = {
178 &mmdc_pmu_events_attr_group,
179 &mmdc_pmu_format_attr_group,
180 &mmdc_pmu_cpumask_attr_group,
184 static u32 mmdc_pmu_read_counter(struct mmdc_pmu *pmu_mmdc, int cfg)
186 void __iomem *mmdc_base, *reg;
188 mmdc_base = pmu_mmdc->mmdc_base;
192 reg = mmdc_base + MMDC_MADPSR0;
195 reg = mmdc_base + MMDC_MADPSR1;
198 reg = mmdc_base + MMDC_MADPSR2;
201 reg = mmdc_base + MMDC_MADPSR3;
204 reg = mmdc_base + MMDC_MADPSR4;
207 reg = mmdc_base + MMDC_MADPSR5;
211 "invalid configuration %d for mmdc counter", cfg);
216 static int mmdc_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
218 struct mmdc_pmu *pmu_mmdc = hlist_entry_safe(node, struct mmdc_pmu, node);
221 if (!cpumask_test_and_clear_cpu(cpu, &pmu_mmdc->cpu))
224 target = cpumask_any_but(cpu_online_mask, cpu);
225 if (target >= nr_cpu_ids)
228 perf_pmu_migrate_context(&pmu_mmdc->pmu, cpu, target);
229 cpumask_set_cpu(target, &pmu_mmdc->cpu);
234 static bool mmdc_pmu_group_event_is_valid(struct perf_event *event,
236 unsigned long *used_counters)
238 int cfg = event->attr.config;
240 if (is_software_event(event))
243 if (event->pmu != pmu)
246 return !test_and_set_bit(cfg, used_counters);
250 * Each event has a single fixed-purpose counter, so we can only have a
251 * single active event for each at any point in time. Here we just check
252 * for duplicates, and rely on mmdc_pmu_event_init to verify that the HW
253 * event numbers are valid.
255 static bool mmdc_pmu_group_is_valid(struct perf_event *event)
257 struct pmu *pmu = event->pmu;
258 struct perf_event *leader = event->group_leader;
259 struct perf_event *sibling;
260 unsigned long counter_mask = 0;
262 set_bit(leader->attr.config, &counter_mask);
264 if (event != leader) {
265 if (!mmdc_pmu_group_event_is_valid(event, pmu, &counter_mask))
269 for_each_sibling_event(sibling, leader) {
270 if (!mmdc_pmu_group_event_is_valid(sibling, pmu, &counter_mask))
277 static int mmdc_pmu_event_init(struct perf_event *event)
279 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
280 int cfg = event->attr.config;
282 if (event->attr.type != event->pmu->type)
285 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
288 if (event->cpu < 0) {
289 dev_warn(pmu_mmdc->dev, "Can't provide per-task data!\n");
293 if (event->attr.sample_period)
296 if (cfg < 0 || cfg >= MMDC_NUM_COUNTERS)
299 if (!mmdc_pmu_group_is_valid(event))
302 event->cpu = cpumask_first(&pmu_mmdc->cpu);
306 static void mmdc_pmu_event_update(struct perf_event *event)
308 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
309 struct hw_perf_event *hwc = &event->hw;
310 u64 delta, prev_raw_count, new_raw_count;
313 prev_raw_count = local64_read(&hwc->prev_count);
314 new_raw_count = mmdc_pmu_read_counter(pmu_mmdc,
316 } while (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
317 new_raw_count) != prev_raw_count);
319 delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF;
321 local64_add(delta, &event->count);
324 static void mmdc_pmu_event_start(struct perf_event *event, int flags)
326 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
327 struct hw_perf_event *hwc = &event->hw;
328 void __iomem *mmdc_base, *reg;
331 mmdc_base = pmu_mmdc->mmdc_base;
332 reg = mmdc_base + MMDC_MADPCR0;
335 * hrtimer is required because mmdc does not provide an interrupt so
336 * polling is necessary
338 hrtimer_start(&pmu_mmdc->hrtimer, mmdc_pmu_timer_period(),
339 HRTIMER_MODE_REL_PINNED);
341 local64_set(&hwc->prev_count, 0);
343 writel(DBG_RST, reg);
346 * Write the AXI id parameter to MADPCR1.
348 val = event->attr.config1;
349 reg = mmdc_base + MMDC_MADPCR1;
352 reg = mmdc_base + MMDC_MADPCR0;
354 if (pmu_mmdc->devtype_data->flags & MMDC_FLAG_PROFILE_SEL)
360 static int mmdc_pmu_event_add(struct perf_event *event, int flags)
362 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
363 struct hw_perf_event *hwc = &event->hw;
365 int cfg = event->attr.config;
367 if (flags & PERF_EF_START)
368 mmdc_pmu_event_start(event, flags);
370 if (pmu_mmdc->mmdc_events[cfg] != NULL)
373 pmu_mmdc->mmdc_events[cfg] = event;
374 pmu_mmdc->active_events++;
376 local64_set(&hwc->prev_count, mmdc_pmu_read_counter(pmu_mmdc, cfg));
381 static void mmdc_pmu_event_stop(struct perf_event *event, int flags)
383 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
384 void __iomem *mmdc_base, *reg;
386 mmdc_base = pmu_mmdc->mmdc_base;
387 reg = mmdc_base + MMDC_MADPCR0;
389 writel(PRF_FRZ, reg);
391 reg = mmdc_base + MMDC_MADPCR1;
392 writel(MMDC_PRF_AXI_ID_CLEAR, reg);
394 mmdc_pmu_event_update(event);
397 static void mmdc_pmu_event_del(struct perf_event *event, int flags)
399 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu);
400 int cfg = event->attr.config;
402 pmu_mmdc->mmdc_events[cfg] = NULL;
403 pmu_mmdc->active_events--;
405 if (pmu_mmdc->active_events == 0)
406 hrtimer_cancel(&pmu_mmdc->hrtimer);
408 mmdc_pmu_event_stop(event, PERF_EF_UPDATE);
411 static void mmdc_pmu_overflow_handler(struct mmdc_pmu *pmu_mmdc)
415 for (i = 0; i < MMDC_NUM_COUNTERS; i++) {
416 struct perf_event *event = pmu_mmdc->mmdc_events[i];
419 mmdc_pmu_event_update(event);
423 static enum hrtimer_restart mmdc_pmu_timer_handler(struct hrtimer *hrtimer)
425 struct mmdc_pmu *pmu_mmdc = container_of(hrtimer, struct mmdc_pmu,
428 mmdc_pmu_overflow_handler(pmu_mmdc);
429 hrtimer_forward_now(hrtimer, mmdc_pmu_timer_period());
431 return HRTIMER_RESTART;
434 static int mmdc_pmu_init(struct mmdc_pmu *pmu_mmdc,
435 void __iomem *mmdc_base, struct device *dev)
437 *pmu_mmdc = (struct mmdc_pmu) {
438 .pmu = (struct pmu) {
439 .task_ctx_nr = perf_invalid_context,
440 .attr_groups = attr_groups,
441 .event_init = mmdc_pmu_event_init,
442 .add = mmdc_pmu_event_add,
443 .del = mmdc_pmu_event_del,
444 .start = mmdc_pmu_event_start,
445 .stop = mmdc_pmu_event_stop,
446 .read = mmdc_pmu_event_update,
447 .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
449 .mmdc_base = mmdc_base,
454 pmu_mmdc->id = ida_simple_get(&mmdc_ida, 0, 0, GFP_KERNEL);
459 static void imx_mmdc_remove(struct platform_device *pdev)
461 struct mmdc_pmu *pmu_mmdc = platform_get_drvdata(pdev);
463 ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
464 cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
465 perf_pmu_unregister(&pmu_mmdc->pmu);
466 iounmap(pmu_mmdc->mmdc_base);
467 clk_disable_unprepare(pmu_mmdc->mmdc_ipg_clk);
471 static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base,
472 struct clk *mmdc_ipg_clk)
474 struct mmdc_pmu *pmu_mmdc;
477 const struct of_device_id *of_id =
478 of_match_device(imx_mmdc_dt_ids, &pdev->dev);
480 pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL);
482 pr_err("failed to allocate PMU device!\n");
486 /* The first instance registers the hotplug state */
487 if (!cpuhp_mmdc_state) {
488 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
489 "perf/arm/mmdc:online", NULL,
490 mmdc_pmu_offline_cpu);
492 pr_err("cpuhp_setup_state_multi failed\n");
495 cpuhp_mmdc_state = ret;
498 ret = mmdc_pmu_init(pmu_mmdc, mmdc_base, &pdev->dev);
502 name = devm_kasprintf(&pdev->dev,
503 GFP_KERNEL, "mmdc%d", ret);
505 pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
506 pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data;
508 hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC,
510 pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler;
512 cpumask_set_cpu(raw_smp_processor_id(), &pmu_mmdc->cpu);
514 /* Register the pmu instance for cpu hotplug */
515 cpuhp_state_add_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
517 ret = perf_pmu_register(&(pmu_mmdc->pmu), name, -1);
519 goto pmu_register_err;
521 platform_set_drvdata(pdev, pmu_mmdc);
525 pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret);
526 ida_simple_remove(&mmdc_ida, pmu_mmdc->id);
527 cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
528 hrtimer_cancel(&pmu_mmdc->hrtimer);
535 #define imx_mmdc_remove NULL
536 #define imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk) 0
539 static int imx_mmdc_probe(struct platform_device *pdev)
541 struct device_node *np = pdev->dev.of_node;
542 void __iomem *mmdc_base, *reg;
543 struct clk *mmdc_ipg_clk;
547 /* the ipg clock is optional */
548 mmdc_ipg_clk = devm_clk_get(&pdev->dev, NULL);
549 if (IS_ERR(mmdc_ipg_clk))
552 err = clk_prepare_enable(mmdc_ipg_clk);
554 dev_err(&pdev->dev, "Unable to enable mmdc ipg clock.\n");
558 mmdc_base = of_iomap(np, 0);
561 reg = mmdc_base + MMDC_MDMISC;
563 val = readl_relaxed(reg);
564 ddr_type = (val & BM_MMDC_MDMISC_DDR_TYPE) >>
565 BP_MMDC_MDMISC_DDR_TYPE;
567 reg = mmdc_base + MMDC_MAPSR;
569 /* Enable automatic power saving */
570 val = readl_relaxed(reg);
571 val &= ~(1 << BP_MMDC_MAPSR_PSD);
572 writel_relaxed(val, reg);
574 err = imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk);
577 clk_disable_unprepare(mmdc_ipg_clk);
583 int imx_mmdc_get_ddr_type(void)
588 static struct platform_driver imx_mmdc_driver = {
591 .of_match_table = imx_mmdc_dt_ids,
593 .probe = imx_mmdc_probe,
594 .remove_new = imx_mmdc_remove,
597 static int __init imx_mmdc_init(void)
599 return platform_driver_register(&imx_mmdc_driver);
601 postcore_initcall(imx_mmdc_init);