1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright 2023 NXP
3
4 #include <linux/bitfield.h>
5 #include <linux/init.h>
6 #include <linux/interrupt.h>
7 #include <linux/io.h>
8 #include <linux/module.h>
9 #include <linux/of.h>
10 #include <linux/platform_device.h>
11 #include <linux/perf_event.h>
12
13 /* Performance monitor configuration */
14 #define PMCFG1 0x00
15 #define PMCFG1_RD_TRANS_FILT_EN BIT(31)
16 #define PMCFG1_WR_TRANS_FILT_EN BIT(30)
17 #define PMCFG1_RD_BT_FILT_EN BIT(29)
18 #define PMCFG1_ID_MASK GENMASK(17, 0)
19
20 #define PMCFG2 0x04
21 #define PMCFG2_ID GENMASK(17, 0)
22
23 /* Global control register affects all counters and takes priority over local control registers */
24 #define PMGC0 0x40
25 /* Global control register bits */
26 #define PMGC0_FAC BIT(31)
27 #define PMGC0_PMIE BIT(30)
28 #define PMGC0_FCECE BIT(29)
29
30 /*
31 * 64bit counter0 exclusively dedicated to counting cycles
32 * 32bit counters monitor counter-specific events in addition to counting reference events
33 */
34 #define PMLCA(n) (0x40 + 0x10 + (0x10 * n))
35 #define PMLCB(n) (0x40 + 0x14 + (0x10 * n))
36 #define PMC(n) (0x40 + 0x18 + (0x10 * n))
37 /* Local control register bits */
38 #define PMLCA_FC BIT(31)
39 #define PMLCA_CE BIT(26)
40 #define PMLCA_EVENT GENMASK(22, 16)
41
42 #define NUM_COUNTERS 11
43 #define CYCLES_COUNTER 0
44
45 #define to_ddr_pmu(p) container_of(p, struct ddr_pmu, pmu)
46
47 #define DDR_PERF_DEV_NAME "imx9_ddr"
48 #define DDR_CPUHP_CB_NAME DDR_PERF_DEV_NAME "_perf_pmu"
49
50 static DEFINE_IDA(ddr_ida);
51
52 struct imx_ddr_devtype_data {
53 const char *identifier; /* system PMU identifier for userspace */
54 };
55
56 struct ddr_pmu {
57 struct pmu pmu;
58 void __iomem *base;
59 unsigned int cpu;
60 struct hlist_node node;
61 struct device *dev;
62 struct perf_event *events[NUM_COUNTERS];
63 int active_events;
64 enum cpuhp_state cpuhp_state;
65 const struct imx_ddr_devtype_data *devtype_data;
66 int irq;
67 int id;
68 };
69
70 static const struct imx_ddr_devtype_data imx93_devtype_data = {
71 .identifier = "imx93",
72 };
73
74 static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
75 {.compatible = "fsl,imx93-ddr-pmu", .data = &imx93_devtype_data},
76 { /* sentinel */ }
77 };
78 MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids);
79
ddr_perf_identifier_show(struct device * dev,struct device_attribute * attr,char * page)80 static ssize_t ddr_perf_identifier_show(struct device *dev,
81 struct device_attribute *attr,
82 char *page)
83 {
84 struct ddr_pmu *pmu = dev_get_drvdata(dev);
85
86 return sysfs_emit(page, "%s\n", pmu->devtype_data->identifier);
87 }
88
89 static struct device_attribute ddr_perf_identifier_attr =
90 __ATTR(identifier, 0444, ddr_perf_identifier_show, NULL);
91
92 static struct attribute *ddr_perf_identifier_attrs[] = {
93 &ddr_perf_identifier_attr.attr,
94 NULL,
95 };
96
97 static struct attribute_group ddr_perf_identifier_attr_group = {
98 .attrs = ddr_perf_identifier_attrs,
99 };
100
ddr_perf_cpumask_show(struct device * dev,struct device_attribute * attr,char * buf)101 static ssize_t ddr_perf_cpumask_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
103 {
104 struct ddr_pmu *pmu = dev_get_drvdata(dev);
105
106 return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu));
107 }
108
109 static struct device_attribute ddr_perf_cpumask_attr =
110 __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL);
111
112 static struct attribute *ddr_perf_cpumask_attrs[] = {
113 &ddr_perf_cpumask_attr.attr,
114 NULL,
115 };
116
117 static const struct attribute_group ddr_perf_cpumask_attr_group = {
118 .attrs = ddr_perf_cpumask_attrs,
119 };
120
ddr_pmu_event_show(struct device * dev,struct device_attribute * attr,char * page)121 static ssize_t ddr_pmu_event_show(struct device *dev,
122 struct device_attribute *attr, char *page)
123 {
124 struct perf_pmu_events_attr *pmu_attr;
125
126 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
127 return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
128 }
129
130 #define IMX9_DDR_PMU_EVENT_ATTR(_name, _id) \
131 (&((struct perf_pmu_events_attr[]) { \
132 { .attr = __ATTR(_name, 0444, ddr_pmu_event_show, NULL),\
133 .id = _id, } \
134 })[0].attr.attr)
135
136 static struct attribute *ddr_perf_events_attrs[] = {
137 /* counter0 cycles event */
138 IMX9_DDR_PMU_EVENT_ATTR(cycles, 0),
139
140 /* reference events for all normal counters, need assert DEBUG19[21] bit */
141 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ddrc1_rmw_for_ecc, 12),
142 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_rreorder, 13),
143 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_wreorder, 14),
144 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_0, 15),
145 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_1, 16),
146 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_2, 17),
147 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_3, 18),
148 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_4, 19),
149 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_5, 22),
150 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_6, 23),
151 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_7, 24),
152 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_8, 25),
153 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_9, 26),
154 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_10, 27),
155 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_11, 28),
156 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_12, 31),
157 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_13, 59),
158 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_15, 61),
159 IMX9_DDR_PMU_EVENT_ATTR(ddrc_pm_29, 63),
160
161 /* counter1 specific events */
162 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_0, 64),
163 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_1, 65),
164 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_2, 66),
165 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_3, 67),
166 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_4, 68),
167 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_5, 69),
168 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_6, 70),
169 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_riq_7, 71),
170
171 /* counter2 specific events */
172 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_0, 64),
173 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_1, 65),
174 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_2, 66),
175 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_3, 67),
176 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_4, 68),
177 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_5, 69),
178 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_6, 70),
179 IMX9_DDR_PMU_EVENT_ATTR(ddrc_ld_wiq_7, 71),
180 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_empty, 72),
181 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_trans_filt, 73),
182
183 /* counter3 specific events */
184 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_0, 64),
185 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_1, 65),
186 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_2, 66),
187 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_3, 67),
188 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_4, 68),
189 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_5, 69),
190 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_6, 70),
191 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_collision_7, 71),
192 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_full, 72),
193 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_wr_trans_filt, 73),
194
195 /* counter4 specific events */
196 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_0, 64),
197 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_1, 65),
198 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_2, 66),
199 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_3, 67),
200 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_4, 68),
201 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_5, 69),
202 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_6, 70),
203 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_row_open_7, 71),
204 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2_rmw, 72),
205 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pm_rd_beat_filt, 73),
206
207 /* counter5 specific events */
208 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_0, 64),
209 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_1, 65),
210 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_2, 66),
211 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_3, 67),
212 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_4, 68),
213 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_5, 69),
214 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_6, 70),
215 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_start_7, 71),
216 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq1, 72),
217
218 /* counter6 specific events */
219 IMX9_DDR_PMU_EVENT_ATTR(ddrc_qx_valid_end_0, 64),
220 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq2, 72),
221
222 /* counter7 specific events */
223 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_1_2_full, 64),
224 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_wrq0, 65),
225
226 /* counter8 specific events */
227 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_bias_switched, 64),
228 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_1_4_full, 65),
229
230 /* counter9 specific events */
231 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_wrq1, 65),
232 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_3_4_full, 66),
233
234 /* counter10 specific events */
235 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_misc_mrk, 65),
236 IMX9_DDR_PMU_EVENT_ATTR(eddrtq_pmon_ld_rdq0, 66),
237 NULL,
238 };
239
240 static const struct attribute_group ddr_perf_events_attr_group = {
241 .name = "events",
242 .attrs = ddr_perf_events_attrs,
243 };
244
245 PMU_FORMAT_ATTR(event, "config:0-7");
246 PMU_FORMAT_ATTR(counter, "config:8-15");
247 PMU_FORMAT_ATTR(axi_id, "config1:0-17");
248 PMU_FORMAT_ATTR(axi_mask, "config2:0-17");
249
250 static struct attribute *ddr_perf_format_attrs[] = {
251 &format_attr_event.attr,
252 &format_attr_counter.attr,
253 &format_attr_axi_id.attr,
254 &format_attr_axi_mask.attr,
255 NULL,
256 };
257
258 static const struct attribute_group ddr_perf_format_attr_group = {
259 .name = "format",
260 .attrs = ddr_perf_format_attrs,
261 };
262
263 static const struct attribute_group *attr_groups[] = {
264 &ddr_perf_identifier_attr_group,
265 &ddr_perf_cpumask_attr_group,
266 &ddr_perf_events_attr_group,
267 &ddr_perf_format_attr_group,
268 NULL,
269 };
270
ddr_perf_clear_counter(struct ddr_pmu * pmu,int counter)271 static void ddr_perf_clear_counter(struct ddr_pmu *pmu, int counter)
272 {
273 if (counter == CYCLES_COUNTER) {
274 writel(0, pmu->base + PMC(counter) + 0x4);
275 writel(0, pmu->base + PMC(counter));
276 } else {
277 writel(0, pmu->base + PMC(counter));
278 }
279 }
280
ddr_perf_read_counter(struct ddr_pmu * pmu,int counter)281 static u64 ddr_perf_read_counter(struct ddr_pmu *pmu, int counter)
282 {
283 u32 val_lower, val_upper;
284 u64 val;
285
286 if (counter != CYCLES_COUNTER) {
287 val = readl_relaxed(pmu->base + PMC(counter));
288 goto out;
289 }
290
291 /* special handling for reading 64bit cycle counter */
292 do {
293 val_upper = readl_relaxed(pmu->base + PMC(counter) + 0x4);
294 val_lower = readl_relaxed(pmu->base + PMC(counter));
295 } while (val_upper != readl_relaxed(pmu->base + PMC(counter) + 0x4));
296
297 val = val_upper;
298 val = (val << 32);
299 val |= val_lower;
300 out:
301 return val;
302 }
303
ddr_perf_counter_global_config(struct ddr_pmu * pmu,bool enable)304 static void ddr_perf_counter_global_config(struct ddr_pmu *pmu, bool enable)
305 {
306 u32 ctrl;
307
308 ctrl = readl_relaxed(pmu->base + PMGC0);
309
310 if (enable) {
311 /*
312 * The performance monitor must be reset before event counting
313 * sequences. The performance monitor can be reset by first freezing
314 * one or more counters and then clearing the freeze condition to
315 * allow the counters to count according to the settings in the
316 * performance monitor registers. Counters can be frozen individually
317 * by setting PMLCAn[FC] bits, or simultaneously by setting PMGC0[FAC].
318 * Simply clearing these freeze bits will then allow the performance
319 * monitor to begin counting based on the register settings.
320 */
321 ctrl |= PMGC0_FAC;
322 writel(ctrl, pmu->base + PMGC0);
323
324 /*
325 * Freeze all counters disabled, interrupt enabled, and freeze
326 * counters on condition enabled.
327 */
328 ctrl &= ~PMGC0_FAC;
329 ctrl |= PMGC0_PMIE | PMGC0_FCECE;
330 writel(ctrl, pmu->base + PMGC0);
331 } else {
332 ctrl |= PMGC0_FAC;
333 ctrl &= ~(PMGC0_PMIE | PMGC0_FCECE);
334 writel(ctrl, pmu->base + PMGC0);
335 }
336 }
337
ddr_perf_counter_local_config(struct ddr_pmu * pmu,int config,int counter,bool enable)338 static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config,
339 int counter, bool enable)
340 {
341 u32 ctrl_a;
342
343 ctrl_a = readl_relaxed(pmu->base + PMLCA(counter));
344
345 if (enable) {
346 ctrl_a |= PMLCA_FC;
347 writel(ctrl_a, pmu->base + PMLCA(counter));
348
349 ddr_perf_clear_counter(pmu, counter);
350
351 /* Freeze counter disabled, condition enabled, and program event.*/
352 ctrl_a &= ~PMLCA_FC;
353 ctrl_a |= PMLCA_CE;
354 ctrl_a &= ~FIELD_PREP(PMLCA_EVENT, 0x7F);
355 ctrl_a |= FIELD_PREP(PMLCA_EVENT, (config & 0x000000FF));
356 writel(ctrl_a, pmu->base + PMLCA(counter));
357 } else {
358 /* Freeze counter. */
359 ctrl_a |= PMLCA_FC;
360 writel(ctrl_a, pmu->base + PMLCA(counter));
361 }
362 }
363
ddr_perf_monitor_config(struct ddr_pmu * pmu,int cfg,int cfg1,int cfg2)364 static void ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1, int cfg2)
365 {
366 u32 pmcfg1, pmcfg2;
367 int event, counter;
368
369 event = cfg & 0x000000FF;
370 counter = (cfg & 0x0000FF00) >> 8;
371
372 pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
373
374 if (counter == 2 && event == 73)
375 pmcfg1 |= PMCFG1_RD_TRANS_FILT_EN;
376 else if (counter == 2 && event != 73)
377 pmcfg1 &= ~PMCFG1_RD_TRANS_FILT_EN;
378
379 if (counter == 3 && event == 73)
380 pmcfg1 |= PMCFG1_WR_TRANS_FILT_EN;
381 else if (counter == 3 && event != 73)
382 pmcfg1 &= ~PMCFG1_WR_TRANS_FILT_EN;
383
384 if (counter == 4 && event == 73)
385 pmcfg1 |= PMCFG1_RD_BT_FILT_EN;
386 else if (counter == 4 && event != 73)
387 pmcfg1 &= ~PMCFG1_RD_BT_FILT_EN;
388
389 pmcfg1 &= ~FIELD_PREP(PMCFG1_ID_MASK, 0x3FFFF);
390 pmcfg1 |= FIELD_PREP(PMCFG1_ID_MASK, cfg2);
391 writel(pmcfg1, pmu->base + PMCFG1);
392
393 pmcfg2 = readl_relaxed(pmu->base + PMCFG2);
394 pmcfg2 &= ~FIELD_PREP(PMCFG2_ID, 0x3FFFF);
395 pmcfg2 |= FIELD_PREP(PMCFG2_ID, cfg1);
396 writel(pmcfg2, pmu->base + PMCFG2);
397 }
398
ddr_perf_event_update(struct perf_event * event)399 static void ddr_perf_event_update(struct perf_event *event)
400 {
401 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
402 struct hw_perf_event *hwc = &event->hw;
403 int counter = hwc->idx;
404 u64 new_raw_count;
405
406 new_raw_count = ddr_perf_read_counter(pmu, counter);
407 local64_add(new_raw_count, &event->count);
408
409 /* clear counter's value every time */
410 ddr_perf_clear_counter(pmu, counter);
411 }
412
ddr_perf_event_init(struct perf_event * event)413 static int ddr_perf_event_init(struct perf_event *event)
414 {
415 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
416 struct hw_perf_event *hwc = &event->hw;
417 struct perf_event *sibling;
418
419 if (event->attr.type != event->pmu->type)
420 return -ENOENT;
421
422 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
423 return -EOPNOTSUPP;
424
425 if (event->cpu < 0) {
426 dev_warn(pmu->dev, "Can't provide per-task data!\n");
427 return -EOPNOTSUPP;
428 }
429
430 /*
431 * We must NOT create groups containing mixed PMUs, although software
432 * events are acceptable (for example to create a CCN group
433 * periodically read when a hrtimer aka cpu-clock leader triggers).
434 */
435 if (event->group_leader->pmu != event->pmu &&
436 !is_software_event(event->group_leader))
437 return -EINVAL;
438
439 for_each_sibling_event(sibling, event->group_leader) {
440 if (sibling->pmu != event->pmu &&
441 !is_software_event(sibling))
442 return -EINVAL;
443 }
444
445 event->cpu = pmu->cpu;
446 hwc->idx = -1;
447
448 return 0;
449 }
450
ddr_perf_event_start(struct perf_event * event,int flags)451 static void ddr_perf_event_start(struct perf_event *event, int flags)
452 {
453 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
454 struct hw_perf_event *hwc = &event->hw;
455 int counter = hwc->idx;
456
457 local64_set(&hwc->prev_count, 0);
458
459 ddr_perf_counter_local_config(pmu, event->attr.config, counter, true);
460 hwc->state = 0;
461 }
462
ddr_perf_event_add(struct perf_event * event,int flags)463 static int ddr_perf_event_add(struct perf_event *event, int flags)
464 {
465 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
466 struct hw_perf_event *hwc = &event->hw;
467 int cfg = event->attr.config;
468 int cfg1 = event->attr.config1;
469 int cfg2 = event->attr.config2;
470 int counter;
471
472 counter = (cfg & 0x0000FF00) >> 8;
473
474 pmu->events[counter] = event;
475 pmu->active_events++;
476 hwc->idx = counter;
477 hwc->state |= PERF_HES_STOPPED;
478
479 /* read trans, write trans, read beat */
480 ddr_perf_monitor_config(pmu, cfg, cfg1, cfg2);
481
482 if (flags & PERF_EF_START)
483 ddr_perf_event_start(event, flags);
484
485 return 0;
486 }
487
ddr_perf_event_stop(struct perf_event * event,int flags)488 static void ddr_perf_event_stop(struct perf_event *event, int flags)
489 {
490 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
491 struct hw_perf_event *hwc = &event->hw;
492 int counter = hwc->idx;
493
494 ddr_perf_counter_local_config(pmu, event->attr.config, counter, false);
495 ddr_perf_event_update(event);
496
497 hwc->state |= PERF_HES_STOPPED;
498 }
499
ddr_perf_event_del(struct perf_event * event,int flags)500 static void ddr_perf_event_del(struct perf_event *event, int flags)
501 {
502 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu);
503 struct hw_perf_event *hwc = &event->hw;
504
505 ddr_perf_event_stop(event, PERF_EF_UPDATE);
506
507 pmu->active_events--;
508 hwc->idx = -1;
509 }
510
ddr_perf_pmu_enable(struct pmu * pmu)511 static void ddr_perf_pmu_enable(struct pmu *pmu)
512 {
513 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu);
514
515 ddr_perf_counter_global_config(ddr_pmu, true);
516 }
517
ddr_perf_pmu_disable(struct pmu * pmu)518 static void ddr_perf_pmu_disable(struct pmu *pmu)
519 {
520 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu);
521
522 ddr_perf_counter_global_config(ddr_pmu, false);
523 }
524
ddr_perf_init(struct ddr_pmu * pmu,void __iomem * base,struct device * dev)525 static void ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base,
526 struct device *dev)
527 {
528 *pmu = (struct ddr_pmu) {
529 .pmu = (struct pmu) {
530 .module = THIS_MODULE,
531 .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
532 .task_ctx_nr = perf_invalid_context,
533 .attr_groups = attr_groups,
534 .event_init = ddr_perf_event_init,
535 .add = ddr_perf_event_add,
536 .del = ddr_perf_event_del,
537 .start = ddr_perf_event_start,
538 .stop = ddr_perf_event_stop,
539 .read = ddr_perf_event_update,
540 .pmu_enable = ddr_perf_pmu_enable,
541 .pmu_disable = ddr_perf_pmu_disable,
542 },
543 .base = base,
544 .dev = dev,
545 };
546 }
547
ddr_perf_irq_handler(int irq,void * p)548 static irqreturn_t ddr_perf_irq_handler(int irq, void *p)
549 {
550 struct ddr_pmu *pmu = (struct ddr_pmu *)p;
551 struct perf_event *event;
552 int i;
553
554 /*
555 * Counters can generate an interrupt on an overflow when msb of a
556 * counter changes from 0 to 1. For the interrupt to be signalled,
557 * below condition mush be satisfied:
558 * PMGC0[PMIE] = 1, PMGC0[FCECE] = 1, PMLCAn[CE] = 1
559 * When an interrupt is signalled, PMGC0[FAC] is set by hardware and
560 * all of the registers are frozen.
561 * Software can clear the interrupt condition by resetting the performance
562 * monitor and clearing the most significant bit of the counter that
563 * generate the overflow.
564 */
565 for (i = 0; i < NUM_COUNTERS; i++) {
566 if (!pmu->events[i])
567 continue;
568
569 event = pmu->events[i];
570
571 ddr_perf_event_update(event);
572 }
573
574 ddr_perf_counter_global_config(pmu, true);
575
576 return IRQ_HANDLED;
577 }
578
ddr_perf_offline_cpu(unsigned int cpu,struct hlist_node * node)579 static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node)
580 {
581 struct ddr_pmu *pmu = hlist_entry_safe(node, struct ddr_pmu, node);
582 int target;
583
584 if (cpu != pmu->cpu)
585 return 0;
586
587 target = cpumask_any_but(cpu_online_mask, cpu);
588 if (target >= nr_cpu_ids)
589 return 0;
590
591 perf_pmu_migrate_context(&pmu->pmu, cpu, target);
592 pmu->cpu = target;
593
594 WARN_ON(irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu)));
595
596 return 0;
597 }
598
ddr_perf_probe(struct platform_device * pdev)599 static int ddr_perf_probe(struct platform_device *pdev)
600 {
601 struct ddr_pmu *pmu;
602 void __iomem *base;
603 int ret, irq;
604 char *name;
605
606 base = devm_platform_ioremap_resource(pdev, 0);
607 if (IS_ERR(base))
608 return PTR_ERR(base);
609
610 pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL);
611 if (!pmu)
612 return -ENOMEM;
613
614 ddr_perf_init(pmu, base, &pdev->dev);
615
616 pmu->devtype_data = of_device_get_match_data(&pdev->dev);
617
618 platform_set_drvdata(pdev, pmu);
619
620 pmu->id = ida_simple_get(&ddr_ida, 0, 0, GFP_KERNEL);
621 name = devm_kasprintf(&pdev->dev, GFP_KERNEL, DDR_PERF_DEV_NAME "%d", pmu->id);
622 if (!name) {
623 ret = -ENOMEM;
624 goto format_string_err;
625 }
626
627 pmu->cpu = raw_smp_processor_id();
628 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DDR_CPUHP_CB_NAME,
629 NULL, ddr_perf_offline_cpu);
630 if (ret < 0) {
631 dev_err(&pdev->dev, "Failed to add callbacks for multi state\n");
632 goto cpuhp_state_err;
633 }
634 pmu->cpuhp_state = ret;
635
636 /* Register the pmu instance for cpu hotplug */
637 ret = cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node);
638 if (ret) {
639 dev_err(&pdev->dev, "Error %d registering hotplug\n", ret);
640 goto cpuhp_instance_err;
641 }
642
643 /* Request irq */
644 irq = platform_get_irq(pdev, 0);
645 if (irq < 0) {
646 ret = irq;
647 goto ddr_perf_err;
648 }
649
650 ret = devm_request_irq(&pdev->dev, irq, ddr_perf_irq_handler,
651 IRQF_NOBALANCING | IRQF_NO_THREAD,
652 DDR_CPUHP_CB_NAME, pmu);
653 if (ret < 0) {
654 dev_err(&pdev->dev, "Request irq failed: %d", ret);
655 goto ddr_perf_err;
656 }
657
658 pmu->irq = irq;
659 ret = irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu));
660 if (ret) {
661 dev_err(pmu->dev, "Failed to set interrupt affinity\n");
662 goto ddr_perf_err;
663 }
664
665 ret = perf_pmu_register(&pmu->pmu, name, -1);
666 if (ret)
667 goto ddr_perf_err;
668
669 return 0;
670
671 ddr_perf_err:
672 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node);
673 cpuhp_instance_err:
674 cpuhp_remove_multi_state(pmu->cpuhp_state);
675 cpuhp_state_err:
676 format_string_err:
677 ida_simple_remove(&ddr_ida, pmu->id);
678 dev_warn(&pdev->dev, "i.MX9 DDR Perf PMU failed (%d), disabled\n", ret);
679 return ret;
680 }
681
ddr_perf_remove(struct platform_device * pdev)682 static int ddr_perf_remove(struct platform_device *pdev)
683 {
684 struct ddr_pmu *pmu = platform_get_drvdata(pdev);
685
686 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node);
687 cpuhp_remove_multi_state(pmu->cpuhp_state);
688
689 perf_pmu_unregister(&pmu->pmu);
690
691 ida_simple_remove(&ddr_ida, pmu->id);
692
693 return 0;
694 }
695
696 static struct platform_driver imx_ddr_pmu_driver = {
697 .driver = {
698 .name = "imx9-ddr-pmu",
699 .of_match_table = imx_ddr_pmu_dt_ids,
700 .suppress_bind_attrs = true,
701 },
702 .probe = ddr_perf_probe,
703 .remove = ddr_perf_remove,
704 };
705 module_platform_driver(imx_ddr_pmu_driver);
706
707 MODULE_AUTHOR("Xu Yang <xu.yang_2@nxp.com>");
708 MODULE_LICENSE("GPL v2");
709 MODULE_DESCRIPTION("DDRC PerfMon for i.MX9 SoCs");
710