1 // SPDX-License-Identifier: GPL-2.0
2 /* Marvell CN10K DRAM Subsystem (DSS) Performance Monitor Driver
3 *
4 * Copyright (C) 2021 Marvell.
5 */
6
7 #include <linux/init.h>
8 #include <linux/io.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/perf_event.h>
12 #include <linux/hrtimer.h>
13 #include <linux/acpi.h>
14 #include <linux/platform_device.h>
15
16 /* Performance Counters Operating Mode Control Registers */
17 #define DDRC_PERF_CNT_OP_MODE_CTRL 0x8020
18 #define OP_MODE_CTRL_VAL_MANNUAL 0x1
19
20 /* Performance Counters Start Operation Control Registers */
21 #define DDRC_PERF_CNT_START_OP_CTRL 0x8028
22 #define START_OP_CTRL_VAL_START 0x1ULL
23 #define START_OP_CTRL_VAL_ACTIVE 0x2
24
25 /* Performance Counters End Operation Control Registers */
26 #define DDRC_PERF_CNT_END_OP_CTRL 0x8030
27 #define END_OP_CTRL_VAL_END 0x1ULL
28
29 /* Performance Counters End Status Registers */
30 #define DDRC_PERF_CNT_END_STATUS 0x8038
31 #define END_STATUS_VAL_END_TIMER_MODE_END 0x1
32
33 /* Performance Counters Configuration Registers */
34 #define DDRC_PERF_CFG_BASE 0x8040
35
36 /* 8 Generic event counter + 2 fixed event counters */
37 #define DDRC_PERF_NUM_GEN_COUNTERS 8
38 #define DDRC_PERF_NUM_FIX_COUNTERS 2
39 #define DDRC_PERF_READ_COUNTER_IDX DDRC_PERF_NUM_GEN_COUNTERS
40 #define DDRC_PERF_WRITE_COUNTER_IDX (DDRC_PERF_NUM_GEN_COUNTERS + 1)
41 #define DDRC_PERF_NUM_COUNTERS (DDRC_PERF_NUM_GEN_COUNTERS + \
42 DDRC_PERF_NUM_FIX_COUNTERS)
43
44 /* Generic event counter registers */
45 #define DDRC_PERF_CFG(n) (DDRC_PERF_CFG_BASE + 8 * (n))
46 #define EVENT_ENABLE BIT_ULL(63)
47
48 /* Two dedicated event counters for DDR reads and writes */
49 #define EVENT_DDR_READS 101
50 #define EVENT_DDR_WRITES 100
51
52 /*
53 * programmable events IDs in programmable event counters.
54 * DO NOT change these event-id numbers, they are used to
55 * program event bitmap in h/w.
56 */
57 #define EVENT_OP_IS_ZQLATCH 55
58 #define EVENT_OP_IS_ZQSTART 54
59 #define EVENT_OP_IS_TCR_MRR 53
60 #define EVENT_OP_IS_DQSOSC_MRR 52
61 #define EVENT_OP_IS_DQSOSC_MPC 51
62 #define EVENT_VISIBLE_WIN_LIMIT_REACHED_WR 50
63 #define EVENT_VISIBLE_WIN_LIMIT_REACHED_RD 49
64 #define EVENT_BSM_STARVATION 48
65 #define EVENT_BSM_ALLOC 47
66 #define EVENT_LPR_REQ_WITH_NOCREDIT 46
67 #define EVENT_HPR_REQ_WITH_NOCREDIT 45
68 #define EVENT_OP_IS_ZQCS 44
69 #define EVENT_OP_IS_ZQCL 43
70 #define EVENT_OP_IS_LOAD_MODE 42
71 #define EVENT_OP_IS_SPEC_REF 41
72 #define EVENT_OP_IS_CRIT_REF 40
73 #define EVENT_OP_IS_REFRESH 39
74 #define EVENT_OP_IS_ENTER_MPSM 35
75 #define EVENT_OP_IS_ENTER_POWERDOWN 31
76 #define EVENT_OP_IS_ENTER_SELFREF 27
77 #define EVENT_WAW_HAZARD 26
78 #define EVENT_RAW_HAZARD 25
79 #define EVENT_WAR_HAZARD 24
80 #define EVENT_WRITE_COMBINE 23
81 #define EVENT_RDWR_TRANSITIONS 22
82 #define EVENT_PRECHARGE_FOR_OTHER 21
83 #define EVENT_PRECHARGE_FOR_RDWR 20
84 #define EVENT_OP_IS_PRECHARGE 19
85 #define EVENT_OP_IS_MWR 18
86 #define EVENT_OP_IS_WR 17
87 #define EVENT_OP_IS_RD 16
88 #define EVENT_OP_IS_RD_ACTIVATE 15
89 #define EVENT_OP_IS_RD_OR_WR 14
90 #define EVENT_OP_IS_ACTIVATE 13
91 #define EVENT_WR_XACT_WHEN_CRITICAL 12
92 #define EVENT_LPR_XACT_WHEN_CRITICAL 11
93 #define EVENT_HPR_XACT_WHEN_CRITICAL 10
94 #define EVENT_DFI_RD_DATA_CYCLES 9
95 #define EVENT_DFI_WR_DATA_CYCLES 8
96 #define EVENT_ACT_BYPASS 7
97 #define EVENT_READ_BYPASS 6
98 #define EVENT_HIF_HI_PRI_RD 5
99 #define EVENT_HIF_RMW 4
100 #define EVENT_HIF_RD 3
101 #define EVENT_HIF_WR 2
102 #define EVENT_HIF_RD_OR_WR 1
103
104 /* Event counter value registers */
105 #define DDRC_PERF_CNT_VALUE_BASE 0x8080
106 #define DDRC_PERF_CNT_VALUE(n) (DDRC_PERF_CNT_VALUE_BASE + 8 * (n))
107
108 /* Fixed event counter enable/disable register */
109 #define DDRC_PERF_CNT_FREERUN_EN 0x80C0
110 #define DDRC_PERF_FREERUN_WRITE_EN 0x1
111 #define DDRC_PERF_FREERUN_READ_EN 0x2
112
113 /* Fixed event counter control register */
114 #define DDRC_PERF_CNT_FREERUN_CTRL 0x80C8
115 #define DDRC_FREERUN_WRITE_CNT_CLR 0x1
116 #define DDRC_FREERUN_READ_CNT_CLR 0x2
117
118 /* Fixed event counter value register */
119 #define DDRC_PERF_CNT_VALUE_WR_OP 0x80D0
120 #define DDRC_PERF_CNT_VALUE_RD_OP 0x80D8
121 #define DDRC_PERF_CNT_VALUE_OVERFLOW BIT_ULL(48)
122 #define DDRC_PERF_CNT_MAX_VALUE GENMASK_ULL(48, 0)
123
124 struct cn10k_ddr_pmu {
125 struct pmu pmu;
126 void __iomem *base;
127 unsigned int cpu;
128 struct device *dev;
129 int active_events;
130 struct perf_event *events[DDRC_PERF_NUM_COUNTERS];
131 struct hrtimer hrtimer;
132 struct hlist_node node;
133 };
134
135 #define to_cn10k_ddr_pmu(p) container_of(p, struct cn10k_ddr_pmu, pmu)
136
cn10k_ddr_pmu_event_show(struct device * dev,struct device_attribute * attr,char * page)137 static ssize_t cn10k_ddr_pmu_event_show(struct device *dev,
138 struct device_attribute *attr,
139 char *page)
140 {
141 struct perf_pmu_events_attr *pmu_attr;
142
143 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
144 return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
145
146 }
147
148 #define CN10K_DDR_PMU_EVENT_ATTR(_name, _id) \
149 PMU_EVENT_ATTR_ID(_name, cn10k_ddr_pmu_event_show, _id)
150
151 static struct attribute *cn10k_ddr_perf_events_attrs[] = {
152 CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_rd_or_wr_access, EVENT_HIF_RD_OR_WR),
153 CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_wr_access, EVENT_HIF_WR),
154 CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_rd_access, EVENT_HIF_RD),
155 CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_rmw_access, EVENT_HIF_RMW),
156 CN10K_DDR_PMU_EVENT_ATTR(ddr_hif_pri_rdaccess, EVENT_HIF_HI_PRI_RD),
157 CN10K_DDR_PMU_EVENT_ATTR(ddr_rd_bypass_access, EVENT_READ_BYPASS),
158 CN10K_DDR_PMU_EVENT_ATTR(ddr_act_bypass_access, EVENT_ACT_BYPASS),
159 CN10K_DDR_PMU_EVENT_ATTR(ddr_dif_wr_data_access, EVENT_DFI_WR_DATA_CYCLES),
160 CN10K_DDR_PMU_EVENT_ATTR(ddr_dif_rd_data_access, EVENT_DFI_RD_DATA_CYCLES),
161 CN10K_DDR_PMU_EVENT_ATTR(ddr_hpri_sched_rd_crit_access,
162 EVENT_HPR_XACT_WHEN_CRITICAL),
163 CN10K_DDR_PMU_EVENT_ATTR(ddr_lpri_sched_rd_crit_access,
164 EVENT_LPR_XACT_WHEN_CRITICAL),
165 CN10K_DDR_PMU_EVENT_ATTR(ddr_wr_trxn_crit_access,
166 EVENT_WR_XACT_WHEN_CRITICAL),
167 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_active_access, EVENT_OP_IS_ACTIVATE),
168 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_rd_or_wr_access, EVENT_OP_IS_RD_OR_WR),
169 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_rd_active_access, EVENT_OP_IS_RD_ACTIVATE),
170 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_read, EVENT_OP_IS_RD),
171 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_write, EVENT_OP_IS_WR),
172 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_mwr, EVENT_OP_IS_MWR),
173 CN10K_DDR_PMU_EVENT_ATTR(ddr_precharge, EVENT_OP_IS_PRECHARGE),
174 CN10K_DDR_PMU_EVENT_ATTR(ddr_precharge_for_rdwr, EVENT_PRECHARGE_FOR_RDWR),
175 CN10K_DDR_PMU_EVENT_ATTR(ddr_precharge_for_other,
176 EVENT_PRECHARGE_FOR_OTHER),
177 CN10K_DDR_PMU_EVENT_ATTR(ddr_rdwr_transitions, EVENT_RDWR_TRANSITIONS),
178 CN10K_DDR_PMU_EVENT_ATTR(ddr_write_combine, EVENT_WRITE_COMBINE),
179 CN10K_DDR_PMU_EVENT_ATTR(ddr_war_hazard, EVENT_WAR_HAZARD),
180 CN10K_DDR_PMU_EVENT_ATTR(ddr_raw_hazard, EVENT_RAW_HAZARD),
181 CN10K_DDR_PMU_EVENT_ATTR(ddr_waw_hazard, EVENT_WAW_HAZARD),
182 CN10K_DDR_PMU_EVENT_ATTR(ddr_enter_selfref, EVENT_OP_IS_ENTER_SELFREF),
183 CN10K_DDR_PMU_EVENT_ATTR(ddr_enter_powerdown, EVENT_OP_IS_ENTER_POWERDOWN),
184 CN10K_DDR_PMU_EVENT_ATTR(ddr_enter_mpsm, EVENT_OP_IS_ENTER_MPSM),
185 CN10K_DDR_PMU_EVENT_ATTR(ddr_refresh, EVENT_OP_IS_REFRESH),
186 CN10K_DDR_PMU_EVENT_ATTR(ddr_crit_ref, EVENT_OP_IS_CRIT_REF),
187 CN10K_DDR_PMU_EVENT_ATTR(ddr_spec_ref, EVENT_OP_IS_SPEC_REF),
188 CN10K_DDR_PMU_EVENT_ATTR(ddr_load_mode, EVENT_OP_IS_LOAD_MODE),
189 CN10K_DDR_PMU_EVENT_ATTR(ddr_zqcl, EVENT_OP_IS_ZQCL),
190 CN10K_DDR_PMU_EVENT_ATTR(ddr_cam_wr_access, EVENT_OP_IS_ZQCS),
191 CN10K_DDR_PMU_EVENT_ATTR(ddr_hpr_req_with_nocredit,
192 EVENT_HPR_REQ_WITH_NOCREDIT),
193 CN10K_DDR_PMU_EVENT_ATTR(ddr_lpr_req_with_nocredit,
194 EVENT_LPR_REQ_WITH_NOCREDIT),
195 CN10K_DDR_PMU_EVENT_ATTR(ddr_bsm_alloc, EVENT_BSM_ALLOC),
196 CN10K_DDR_PMU_EVENT_ATTR(ddr_bsm_starvation, EVENT_BSM_STARVATION),
197 CN10K_DDR_PMU_EVENT_ATTR(ddr_win_limit_reached_rd,
198 EVENT_VISIBLE_WIN_LIMIT_REACHED_RD),
199 CN10K_DDR_PMU_EVENT_ATTR(ddr_win_limit_reached_wr,
200 EVENT_VISIBLE_WIN_LIMIT_REACHED_WR),
201 CN10K_DDR_PMU_EVENT_ATTR(ddr_dqsosc_mpc, EVENT_OP_IS_DQSOSC_MPC),
202 CN10K_DDR_PMU_EVENT_ATTR(ddr_dqsosc_mrr, EVENT_OP_IS_DQSOSC_MRR),
203 CN10K_DDR_PMU_EVENT_ATTR(ddr_tcr_mrr, EVENT_OP_IS_TCR_MRR),
204 CN10K_DDR_PMU_EVENT_ATTR(ddr_zqstart, EVENT_OP_IS_ZQSTART),
205 CN10K_DDR_PMU_EVENT_ATTR(ddr_zqlatch, EVENT_OP_IS_ZQLATCH),
206 /* Free run event counters */
207 CN10K_DDR_PMU_EVENT_ATTR(ddr_ddr_reads, EVENT_DDR_READS),
208 CN10K_DDR_PMU_EVENT_ATTR(ddr_ddr_writes, EVENT_DDR_WRITES),
209 NULL
210 };
211
212 static struct attribute_group cn10k_ddr_perf_events_attr_group = {
213 .name = "events",
214 .attrs = cn10k_ddr_perf_events_attrs,
215 };
216
217 PMU_FORMAT_ATTR(event, "config:0-8");
218
219 static struct attribute *cn10k_ddr_perf_format_attrs[] = {
220 &format_attr_event.attr,
221 NULL,
222 };
223
224 static struct attribute_group cn10k_ddr_perf_format_attr_group = {
225 .name = "format",
226 .attrs = cn10k_ddr_perf_format_attrs,
227 };
228
cn10k_ddr_perf_cpumask_show(struct device * dev,struct device_attribute * attr,char * buf)229 static ssize_t cn10k_ddr_perf_cpumask_show(struct device *dev,
230 struct device_attribute *attr,
231 char *buf)
232 {
233 struct cn10k_ddr_pmu *pmu = dev_get_drvdata(dev);
234
235 return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu));
236 }
237
238 static struct device_attribute cn10k_ddr_perf_cpumask_attr =
239 __ATTR(cpumask, 0444, cn10k_ddr_perf_cpumask_show, NULL);
240
241 static struct attribute *cn10k_ddr_perf_cpumask_attrs[] = {
242 &cn10k_ddr_perf_cpumask_attr.attr,
243 NULL,
244 };
245
246 static struct attribute_group cn10k_ddr_perf_cpumask_attr_group = {
247 .attrs = cn10k_ddr_perf_cpumask_attrs,
248 };
249
250 static const struct attribute_group *cn10k_attr_groups[] = {
251 &cn10k_ddr_perf_events_attr_group,
252 &cn10k_ddr_perf_format_attr_group,
253 &cn10k_ddr_perf_cpumask_attr_group,
254 NULL,
255 };
256
257 /* Default poll timeout is 100 sec, which is very sufficient for
258 * 48 bit counter incremented max at 5.6 GT/s, which may take many
259 * hours to overflow.
260 */
261 static unsigned long cn10k_ddr_pmu_poll_period_sec = 100;
262 module_param_named(poll_period_sec, cn10k_ddr_pmu_poll_period_sec, ulong, 0644);
263
cn10k_ddr_pmu_timer_period(void)264 static ktime_t cn10k_ddr_pmu_timer_period(void)
265 {
266 return ms_to_ktime((u64)cn10k_ddr_pmu_poll_period_sec * USEC_PER_SEC);
267 }
268
ddr_perf_get_event_bitmap(int eventid,u64 * event_bitmap)269 static int ddr_perf_get_event_bitmap(int eventid, u64 *event_bitmap)
270 {
271 switch (eventid) {
272 case EVENT_HIF_RD_OR_WR ... EVENT_WAW_HAZARD:
273 case EVENT_OP_IS_REFRESH ... EVENT_OP_IS_ZQLATCH:
274 *event_bitmap = (1ULL << (eventid - 1));
275 break;
276 case EVENT_OP_IS_ENTER_SELFREF:
277 case EVENT_OP_IS_ENTER_POWERDOWN:
278 case EVENT_OP_IS_ENTER_MPSM:
279 *event_bitmap = (0xFULL << (eventid - 1));
280 break;
281 default:
282 pr_err("%s Invalid eventid %d\n", __func__, eventid);
283 return -EINVAL;
284 }
285
286 return 0;
287 }
288
cn10k_ddr_perf_alloc_counter(struct cn10k_ddr_pmu * pmu,struct perf_event * event)289 static int cn10k_ddr_perf_alloc_counter(struct cn10k_ddr_pmu *pmu,
290 struct perf_event *event)
291 {
292 u8 config = event->attr.config;
293 int i;
294
295 /* DDR read free-run counter index */
296 if (config == EVENT_DDR_READS) {
297 pmu->events[DDRC_PERF_READ_COUNTER_IDX] = event;
298 return DDRC_PERF_READ_COUNTER_IDX;
299 }
300
301 /* DDR write free-run counter index */
302 if (config == EVENT_DDR_WRITES) {
303 pmu->events[DDRC_PERF_WRITE_COUNTER_IDX] = event;
304 return DDRC_PERF_WRITE_COUNTER_IDX;
305 }
306
307 /* Allocate DDR generic counters */
308 for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) {
309 if (pmu->events[i] == NULL) {
310 pmu->events[i] = event;
311 return i;
312 }
313 }
314
315 return -ENOENT;
316 }
317
cn10k_ddr_perf_free_counter(struct cn10k_ddr_pmu * pmu,int counter)318 static void cn10k_ddr_perf_free_counter(struct cn10k_ddr_pmu *pmu, int counter)
319 {
320 pmu->events[counter] = NULL;
321 }
322
cn10k_ddr_perf_event_init(struct perf_event * event)323 static int cn10k_ddr_perf_event_init(struct perf_event *event)
324 {
325 struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
326 struct hw_perf_event *hwc = &event->hw;
327
328 if (event->attr.type != event->pmu->type)
329 return -ENOENT;
330
331 if (is_sampling_event(event)) {
332 dev_info(pmu->dev, "Sampling not supported!\n");
333 return -EOPNOTSUPP;
334 }
335
336 if (event->cpu < 0) {
337 dev_warn(pmu->dev, "Can't provide per-task data!\n");
338 return -EOPNOTSUPP;
339 }
340
341 /* We must NOT create groups containing mixed PMUs */
342 if (event->group_leader->pmu != event->pmu &&
343 !is_software_event(event->group_leader))
344 return -EINVAL;
345
346 /* Set ownership of event to one CPU, same event can not be observed
347 * on multiple cpus at same time.
348 */
349 event->cpu = pmu->cpu;
350 hwc->idx = -1;
351 return 0;
352 }
353
cn10k_ddr_perf_counter_enable(struct cn10k_ddr_pmu * pmu,int counter,bool enable)354 static void cn10k_ddr_perf_counter_enable(struct cn10k_ddr_pmu *pmu,
355 int counter, bool enable)
356 {
357 u32 reg;
358 u64 val;
359
360 if (counter > DDRC_PERF_NUM_COUNTERS) {
361 pr_err("Error: unsupported counter %d\n", counter);
362 return;
363 }
364
365 if (counter < DDRC_PERF_NUM_GEN_COUNTERS) {
366 reg = DDRC_PERF_CFG(counter);
367 val = readq_relaxed(pmu->base + reg);
368
369 if (enable)
370 val |= EVENT_ENABLE;
371 else
372 val &= ~EVENT_ENABLE;
373
374 writeq_relaxed(val, pmu->base + reg);
375 } else {
376 val = readq_relaxed(pmu->base + DDRC_PERF_CNT_FREERUN_EN);
377 if (enable) {
378 if (counter == DDRC_PERF_READ_COUNTER_IDX)
379 val |= DDRC_PERF_FREERUN_READ_EN;
380 else
381 val |= DDRC_PERF_FREERUN_WRITE_EN;
382 } else {
383 if (counter == DDRC_PERF_READ_COUNTER_IDX)
384 val &= ~DDRC_PERF_FREERUN_READ_EN;
385 else
386 val &= ~DDRC_PERF_FREERUN_WRITE_EN;
387 }
388 writeq_relaxed(val, pmu->base + DDRC_PERF_CNT_FREERUN_EN);
389 }
390 }
391
cn10k_ddr_perf_read_counter(struct cn10k_ddr_pmu * pmu,int counter)392 static u64 cn10k_ddr_perf_read_counter(struct cn10k_ddr_pmu *pmu, int counter)
393 {
394 u64 val;
395
396 if (counter == DDRC_PERF_READ_COUNTER_IDX)
397 return readq_relaxed(pmu->base + DDRC_PERF_CNT_VALUE_RD_OP);
398
399 if (counter == DDRC_PERF_WRITE_COUNTER_IDX)
400 return readq_relaxed(pmu->base + DDRC_PERF_CNT_VALUE_WR_OP);
401
402 val = readq_relaxed(pmu->base + DDRC_PERF_CNT_VALUE(counter));
403 return val;
404 }
405
cn10k_ddr_perf_event_update(struct perf_event * event)406 static void cn10k_ddr_perf_event_update(struct perf_event *event)
407 {
408 struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
409 struct hw_perf_event *hwc = &event->hw;
410 u64 prev_count, new_count, mask;
411
412 do {
413 prev_count = local64_read(&hwc->prev_count);
414 new_count = cn10k_ddr_perf_read_counter(pmu, hwc->idx);
415 } while (local64_xchg(&hwc->prev_count, new_count) != prev_count);
416
417 mask = DDRC_PERF_CNT_MAX_VALUE;
418
419 local64_add((new_count - prev_count) & mask, &event->count);
420 }
421
cn10k_ddr_perf_event_start(struct perf_event * event,int flags)422 static void cn10k_ddr_perf_event_start(struct perf_event *event, int flags)
423 {
424 struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
425 struct hw_perf_event *hwc = &event->hw;
426 int counter = hwc->idx;
427
428 local64_set(&hwc->prev_count, 0);
429
430 cn10k_ddr_perf_counter_enable(pmu, counter, true);
431
432 hwc->state = 0;
433 }
434
cn10k_ddr_perf_event_add(struct perf_event * event,int flags)435 static int cn10k_ddr_perf_event_add(struct perf_event *event, int flags)
436 {
437 struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
438 struct hw_perf_event *hwc = &event->hw;
439 u8 config = event->attr.config;
440 int counter, ret;
441 u32 reg_offset;
442 u64 val;
443
444 counter = cn10k_ddr_perf_alloc_counter(pmu, event);
445 if (counter < 0)
446 return -EAGAIN;
447
448 pmu->active_events++;
449 hwc->idx = counter;
450
451 if (pmu->active_events == 1)
452 hrtimer_start(&pmu->hrtimer, cn10k_ddr_pmu_timer_period(),
453 HRTIMER_MODE_REL_PINNED);
454
455 if (counter < DDRC_PERF_NUM_GEN_COUNTERS) {
456 /* Generic counters, configure event id */
457 reg_offset = DDRC_PERF_CFG(counter);
458 ret = ddr_perf_get_event_bitmap(config, &val);
459 if (ret)
460 return ret;
461
462 writeq_relaxed(val, pmu->base + reg_offset);
463 } else {
464 /* fixed event counter, clear counter value */
465 if (counter == DDRC_PERF_READ_COUNTER_IDX)
466 val = DDRC_FREERUN_READ_CNT_CLR;
467 else
468 val = DDRC_FREERUN_WRITE_CNT_CLR;
469
470 writeq_relaxed(val, pmu->base + DDRC_PERF_CNT_FREERUN_CTRL);
471 }
472
473 hwc->state |= PERF_HES_STOPPED;
474
475 if (flags & PERF_EF_START)
476 cn10k_ddr_perf_event_start(event, flags);
477
478 return 0;
479 }
480
cn10k_ddr_perf_event_stop(struct perf_event * event,int flags)481 static void cn10k_ddr_perf_event_stop(struct perf_event *event, int flags)
482 {
483 struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
484 struct hw_perf_event *hwc = &event->hw;
485 int counter = hwc->idx;
486
487 cn10k_ddr_perf_counter_enable(pmu, counter, false);
488
489 if (flags & PERF_EF_UPDATE)
490 cn10k_ddr_perf_event_update(event);
491
492 hwc->state |= PERF_HES_STOPPED;
493 }
494
cn10k_ddr_perf_event_del(struct perf_event * event,int flags)495 static void cn10k_ddr_perf_event_del(struct perf_event *event, int flags)
496 {
497 struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
498 struct hw_perf_event *hwc = &event->hw;
499 int counter = hwc->idx;
500
501 cn10k_ddr_perf_event_stop(event, PERF_EF_UPDATE);
502
503 cn10k_ddr_perf_free_counter(pmu, counter);
504 pmu->active_events--;
505 hwc->idx = -1;
506
507 /* Cancel timer when no events to capture */
508 if (pmu->active_events == 0)
509 hrtimer_cancel(&pmu->hrtimer);
510 }
511
cn10k_ddr_perf_pmu_enable(struct pmu * pmu)512 static void cn10k_ddr_perf_pmu_enable(struct pmu *pmu)
513 {
514 struct cn10k_ddr_pmu *ddr_pmu = to_cn10k_ddr_pmu(pmu);
515
516 writeq_relaxed(START_OP_CTRL_VAL_START, ddr_pmu->base +
517 DDRC_PERF_CNT_START_OP_CTRL);
518 }
519
cn10k_ddr_perf_pmu_disable(struct pmu * pmu)520 static void cn10k_ddr_perf_pmu_disable(struct pmu *pmu)
521 {
522 struct cn10k_ddr_pmu *ddr_pmu = to_cn10k_ddr_pmu(pmu);
523
524 writeq_relaxed(END_OP_CTRL_VAL_END, ddr_pmu->base +
525 DDRC_PERF_CNT_END_OP_CTRL);
526 }
527
cn10k_ddr_perf_event_update_all(struct cn10k_ddr_pmu * pmu)528 static void cn10k_ddr_perf_event_update_all(struct cn10k_ddr_pmu *pmu)
529 {
530 struct hw_perf_event *hwc;
531 int i;
532
533 for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) {
534 if (pmu->events[i] == NULL)
535 continue;
536
537 cn10k_ddr_perf_event_update(pmu->events[i]);
538 }
539
540 /* Reset previous count as h/w counter are reset */
541 for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) {
542 if (pmu->events[i] == NULL)
543 continue;
544
545 hwc = &pmu->events[i]->hw;
546 local64_set(&hwc->prev_count, 0);
547 }
548 }
549
cn10k_ddr_pmu_overflow_handler(struct cn10k_ddr_pmu * pmu)550 static irqreturn_t cn10k_ddr_pmu_overflow_handler(struct cn10k_ddr_pmu *pmu)
551 {
552 struct perf_event *event;
553 struct hw_perf_event *hwc;
554 u64 prev_count, new_count;
555 u64 value;
556 int i;
557
558 event = pmu->events[DDRC_PERF_READ_COUNTER_IDX];
559 if (event) {
560 hwc = &event->hw;
561 prev_count = local64_read(&hwc->prev_count);
562 new_count = cn10k_ddr_perf_read_counter(pmu, hwc->idx);
563
564 /* Overflow condition is when new count less than
565 * previous count
566 */
567 if (new_count < prev_count)
568 cn10k_ddr_perf_event_update(event);
569 }
570
571 event = pmu->events[DDRC_PERF_WRITE_COUNTER_IDX];
572 if (event) {
573 hwc = &event->hw;
574 prev_count = local64_read(&hwc->prev_count);
575 new_count = cn10k_ddr_perf_read_counter(pmu, hwc->idx);
576
577 /* Overflow condition is when new count less than
578 * previous count
579 */
580 if (new_count < prev_count)
581 cn10k_ddr_perf_event_update(event);
582 }
583
584 for (i = 0; i < DDRC_PERF_NUM_GEN_COUNTERS; i++) {
585 if (pmu->events[i] == NULL)
586 continue;
587
588 value = cn10k_ddr_perf_read_counter(pmu, i);
589 if (value == DDRC_PERF_CNT_MAX_VALUE) {
590 pr_info("Counter-(%d) reached max value\n", i);
591 cn10k_ddr_perf_event_update_all(pmu);
592 cn10k_ddr_perf_pmu_disable(&pmu->pmu);
593 cn10k_ddr_perf_pmu_enable(&pmu->pmu);
594 }
595 }
596
597 return IRQ_HANDLED;
598 }
599
cn10k_ddr_pmu_timer_handler(struct hrtimer * hrtimer)600 static enum hrtimer_restart cn10k_ddr_pmu_timer_handler(struct hrtimer *hrtimer)
601 {
602 struct cn10k_ddr_pmu *pmu = container_of(hrtimer, struct cn10k_ddr_pmu,
603 hrtimer);
604 unsigned long flags;
605
606 local_irq_save(flags);
607 cn10k_ddr_pmu_overflow_handler(pmu);
608 local_irq_restore(flags);
609
610 hrtimer_forward_now(hrtimer, cn10k_ddr_pmu_timer_period());
611 return HRTIMER_RESTART;
612 }
613
cn10k_ddr_pmu_offline_cpu(unsigned int cpu,struct hlist_node * node)614 static int cn10k_ddr_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
615 {
616 struct cn10k_ddr_pmu *pmu = hlist_entry_safe(node, struct cn10k_ddr_pmu,
617 node);
618 unsigned int target;
619
620 if (cpu != pmu->cpu)
621 return 0;
622
623 target = cpumask_any_but(cpu_online_mask, cpu);
624 if (target >= nr_cpu_ids)
625 return 0;
626
627 perf_pmu_migrate_context(&pmu->pmu, cpu, target);
628 pmu->cpu = target;
629 return 0;
630 }
631
cn10k_ddr_perf_probe(struct platform_device * pdev)632 static int cn10k_ddr_perf_probe(struct platform_device *pdev)
633 {
634 struct cn10k_ddr_pmu *ddr_pmu;
635 struct resource *res;
636 void __iomem *base;
637 char *name;
638 int ret;
639
640 ddr_pmu = devm_kzalloc(&pdev->dev, sizeof(*ddr_pmu), GFP_KERNEL);
641 if (!ddr_pmu)
642 return -ENOMEM;
643
644 ddr_pmu->dev = &pdev->dev;
645 platform_set_drvdata(pdev, ddr_pmu);
646
647 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
648 if (IS_ERR(base))
649 return PTR_ERR(base);
650
651 ddr_pmu->base = base;
652
653 /* Setup the PMU counter to work in manual mode */
654 writeq_relaxed(OP_MODE_CTRL_VAL_MANNUAL, ddr_pmu->base +
655 DDRC_PERF_CNT_OP_MODE_CTRL);
656
657 ddr_pmu->pmu = (struct pmu) {
658 .module = THIS_MODULE,
659 .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
660 .task_ctx_nr = perf_invalid_context,
661 .attr_groups = cn10k_attr_groups,
662 .event_init = cn10k_ddr_perf_event_init,
663 .add = cn10k_ddr_perf_event_add,
664 .del = cn10k_ddr_perf_event_del,
665 .start = cn10k_ddr_perf_event_start,
666 .stop = cn10k_ddr_perf_event_stop,
667 .read = cn10k_ddr_perf_event_update,
668 .pmu_enable = cn10k_ddr_perf_pmu_enable,
669 .pmu_disable = cn10k_ddr_perf_pmu_disable,
670 };
671
672 /* Choose this cpu to collect perf data */
673 ddr_pmu->cpu = raw_smp_processor_id();
674
675 name = devm_kasprintf(ddr_pmu->dev, GFP_KERNEL, "mrvl_ddr_pmu_%llx",
676 res->start);
677 if (!name)
678 return -ENOMEM;
679
680 hrtimer_init(&ddr_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
681 ddr_pmu->hrtimer.function = cn10k_ddr_pmu_timer_handler;
682
683 cpuhp_state_add_instance_nocalls(
684 CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
685 &ddr_pmu->node);
686
687 ret = perf_pmu_register(&ddr_pmu->pmu, name, -1);
688 if (ret)
689 goto error;
690
691 pr_info("CN10K DDR PMU Driver for ddrc@%llx\n", res->start);
692 return 0;
693 error:
694 cpuhp_state_remove_instance_nocalls(
695 CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
696 &ddr_pmu->node);
697 return ret;
698 }
699
cn10k_ddr_perf_remove(struct platform_device * pdev)700 static int cn10k_ddr_perf_remove(struct platform_device *pdev)
701 {
702 struct cn10k_ddr_pmu *ddr_pmu = platform_get_drvdata(pdev);
703
704 cpuhp_state_remove_instance_nocalls(
705 CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
706 &ddr_pmu->node);
707
708 perf_pmu_unregister(&ddr_pmu->pmu);
709 return 0;
710 }
711
712 #ifdef CONFIG_OF
713 static const struct of_device_id cn10k_ddr_pmu_of_match[] = {
714 { .compatible = "marvell,cn10k-ddr-pmu", },
715 { },
716 };
717 MODULE_DEVICE_TABLE(of, cn10k_ddr_pmu_of_match);
718 #endif
719
720 #ifdef CONFIG_ACPI
721 static const struct acpi_device_id cn10k_ddr_pmu_acpi_match[] = {
722 {"MRVL000A", 0},
723 {},
724 };
725 MODULE_DEVICE_TABLE(acpi, cn10k_ddr_pmu_acpi_match);
726 #endif
727
728 static struct platform_driver cn10k_ddr_pmu_driver = {
729 .driver = {
730 .name = "cn10k-ddr-pmu",
731 .of_match_table = of_match_ptr(cn10k_ddr_pmu_of_match),
732 .acpi_match_table = ACPI_PTR(cn10k_ddr_pmu_acpi_match),
733 .suppress_bind_attrs = true,
734 },
735 .probe = cn10k_ddr_perf_probe,
736 .remove = cn10k_ddr_perf_remove,
737 };
738
cn10k_ddr_pmu_init(void)739 static int __init cn10k_ddr_pmu_init(void)
740 {
741 int ret;
742
743 ret = cpuhp_setup_state_multi(
744 CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE,
745 "perf/marvell/cn10k/ddr:online", NULL,
746 cn10k_ddr_pmu_offline_cpu);
747 if (ret)
748 return ret;
749
750 ret = platform_driver_register(&cn10k_ddr_pmu_driver);
751 if (ret)
752 cpuhp_remove_multi_state(
753 CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE);
754 return ret;
755 }
756
cn10k_ddr_pmu_exit(void)757 static void __exit cn10k_ddr_pmu_exit(void)
758 {
759 platform_driver_unregister(&cn10k_ddr_pmu_driver);
760 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE);
761 }
762
763 module_init(cn10k_ddr_pmu_init);
764 module_exit(cn10k_ddr_pmu_exit);
765
766 MODULE_AUTHOR("Bharat Bhushan <bbhushan2@marvell.com>");
767 MODULE_LICENSE("GPL v2");
768