1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2017 NXP 4 * Copyright 2016 Freescale Semiconductor, Inc. 5 */ 6 7 #include <linux/bitfield.h> 8 #include <linux/init.h> 9 #include <linux/interrupt.h> 10 #include <linux/io.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 #include <linux/of_device.h> 15 #include <linux/of_irq.h> 16 #include <linux/perf_event.h> 17 #include <linux/slab.h> 18 19 #define COUNTER_CNTL 0x0 20 #define COUNTER_READ 0x20 21 22 #define COUNTER_DPCR1 0x30 23 24 #define CNTL_OVER 0x1 25 #define CNTL_CLEAR 0x2 26 #define CNTL_EN 0x4 27 #define CNTL_EN_MASK 0xFFFFFFFB 28 #define CNTL_CLEAR_MASK 0xFFFFFFFD 29 #define CNTL_OVER_MASK 0xFFFFFFFE 30 31 #define CNTL_CSV_SHIFT 24 32 #define CNTL_CSV_MASK (0xFF << CNTL_CSV_SHIFT) 33 34 #define EVENT_CYCLES_ID 0 35 #define EVENT_CYCLES_COUNTER 0 36 #define NUM_COUNTERS 4 37 38 #define AXI_MASKING_REVERT 0xffff0000 /* AXI_MASKING(MSB 16bits) + AXI_ID(LSB 16bits) */ 39 40 #define to_ddr_pmu(p) container_of(p, struct ddr_pmu, pmu) 41 42 #define DDR_PERF_DEV_NAME "imx8_ddr" 43 #define DDR_CPUHP_CB_NAME DDR_PERF_DEV_NAME "_perf_pmu" 44 45 static DEFINE_IDA(ddr_ida); 46 47 /* DDR Perf hardware feature */ 48 #define DDR_CAP_AXI_ID_FILTER 0x1 /* support AXI ID filter */ 49 #define DDR_CAP_AXI_ID_FILTER_ENHANCED 0x3 /* support enhanced AXI ID filter */ 50 51 struct fsl_ddr_devtype_data { 52 unsigned int quirks; /* quirks needed for different DDR Perf core */ 53 const char *identifier; /* system PMU identifier for userspace */ 54 }; 55 56 static const struct fsl_ddr_devtype_data imx8_devtype_data; 57 58 static const struct fsl_ddr_devtype_data imx8m_devtype_data = { 59 .quirks = DDR_CAP_AXI_ID_FILTER, 60 }; 61 62 static const struct fsl_ddr_devtype_data imx8mq_devtype_data = { 63 .quirks = DDR_CAP_AXI_ID_FILTER, 64 .identifier = "i.MX8MQ", 65 }; 66 67 static const struct fsl_ddr_devtype_data imx8mm_devtype_data = { 68 .quirks = DDR_CAP_AXI_ID_FILTER, 69 .identifier = "i.MX8MM", 70 }; 71 72 static const struct fsl_ddr_devtype_data imx8mn_devtype_data = { 73 .quirks = DDR_CAP_AXI_ID_FILTER, 74 .identifier = "i.MX8MN", 75 }; 76 77 static const struct fsl_ddr_devtype_data imx8mp_devtype_data = { 78 .quirks = DDR_CAP_AXI_ID_FILTER_ENHANCED, 79 .identifier = "i.MX8MP", 80 }; 81 82 static const struct of_device_id imx_ddr_pmu_dt_ids[] = { 83 { .compatible = "fsl,imx8-ddr-pmu", .data = &imx8_devtype_data}, 84 { .compatible = "fsl,imx8m-ddr-pmu", .data = &imx8m_devtype_data}, 85 { .compatible = "fsl,imx8mq-ddr-pmu", .data = &imx8mq_devtype_data}, 86 { .compatible = "fsl,imx8mm-ddr-pmu", .data = &imx8mm_devtype_data}, 87 { .compatible = "fsl,imx8mn-ddr-pmu", .data = &imx8mn_devtype_data}, 88 { .compatible = "fsl,imx8mp-ddr-pmu", .data = &imx8mp_devtype_data}, 89 { /* sentinel */ } 90 }; 91 MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids); 92 93 struct ddr_pmu { 94 struct pmu pmu; 95 void __iomem *base; 96 unsigned int cpu; 97 struct hlist_node node; 98 struct device *dev; 99 struct perf_event *events[NUM_COUNTERS]; 100 int active_events; 101 enum cpuhp_state cpuhp_state; 102 const struct fsl_ddr_devtype_data *devtype_data; 103 int irq; 104 int id; 105 }; 106 107 static ssize_t ddr_perf_identifier_show(struct device *dev, 108 struct device_attribute *attr, 109 char *page) 110 { 111 struct ddr_pmu *pmu = dev_get_drvdata(dev); 112 113 return sprintf(page, "%s\n", pmu->devtype_data->identifier); 114 } 115 116 static umode_t ddr_perf_identifier_attr_visible(struct kobject *kobj, 117 struct attribute *attr, 118 int n) 119 { 120 struct device *dev = kobj_to_dev(kobj); 121 struct ddr_pmu *pmu = dev_get_drvdata(dev); 122 123 if (!pmu->devtype_data->identifier) 124 return 0; 125 return attr->mode; 126 }; 127 128 static struct device_attribute ddr_perf_identifier_attr = 129 __ATTR(identifier, 0444, ddr_perf_identifier_show, NULL); 130 131 static struct attribute *ddr_perf_identifier_attrs[] = { 132 &ddr_perf_identifier_attr.attr, 133 NULL, 134 }; 135 136 static const struct attribute_group ddr_perf_identifier_attr_group = { 137 .attrs = ddr_perf_identifier_attrs, 138 .is_visible = ddr_perf_identifier_attr_visible, 139 }; 140 141 enum ddr_perf_filter_capabilities { 142 PERF_CAP_AXI_ID_FILTER = 0, 143 PERF_CAP_AXI_ID_FILTER_ENHANCED, 144 PERF_CAP_AXI_ID_FEAT_MAX, 145 }; 146 147 static u32 ddr_perf_filter_cap_get(struct ddr_pmu *pmu, int cap) 148 { 149 u32 quirks = pmu->devtype_data->quirks; 150 151 switch (cap) { 152 case PERF_CAP_AXI_ID_FILTER: 153 return !!(quirks & DDR_CAP_AXI_ID_FILTER); 154 case PERF_CAP_AXI_ID_FILTER_ENHANCED: 155 quirks &= DDR_CAP_AXI_ID_FILTER_ENHANCED; 156 return quirks == DDR_CAP_AXI_ID_FILTER_ENHANCED; 157 default: 158 WARN(1, "unknown filter cap %d\n", cap); 159 } 160 161 return 0; 162 } 163 164 static ssize_t ddr_perf_filter_cap_show(struct device *dev, 165 struct device_attribute *attr, 166 char *buf) 167 { 168 struct ddr_pmu *pmu = dev_get_drvdata(dev); 169 struct dev_ext_attribute *ea = 170 container_of(attr, struct dev_ext_attribute, attr); 171 int cap = (long)ea->var; 172 173 return snprintf(buf, PAGE_SIZE, "%u\n", 174 ddr_perf_filter_cap_get(pmu, cap)); 175 } 176 177 #define PERF_EXT_ATTR_ENTRY(_name, _func, _var) \ 178 (&((struct dev_ext_attribute) { \ 179 __ATTR(_name, 0444, _func, NULL), (void *)_var \ 180 }).attr.attr) 181 182 #define PERF_FILTER_EXT_ATTR_ENTRY(_name, _var) \ 183 PERF_EXT_ATTR_ENTRY(_name, ddr_perf_filter_cap_show, _var) 184 185 static struct attribute *ddr_perf_filter_cap_attr[] = { 186 PERF_FILTER_EXT_ATTR_ENTRY(filter, PERF_CAP_AXI_ID_FILTER), 187 PERF_FILTER_EXT_ATTR_ENTRY(enhanced_filter, PERF_CAP_AXI_ID_FILTER_ENHANCED), 188 NULL, 189 }; 190 191 static const struct attribute_group ddr_perf_filter_cap_attr_group = { 192 .name = "caps", 193 .attrs = ddr_perf_filter_cap_attr, 194 }; 195 196 static ssize_t ddr_perf_cpumask_show(struct device *dev, 197 struct device_attribute *attr, char *buf) 198 { 199 struct ddr_pmu *pmu = dev_get_drvdata(dev); 200 201 return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu)); 202 } 203 204 static struct device_attribute ddr_perf_cpumask_attr = 205 __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL); 206 207 static struct attribute *ddr_perf_cpumask_attrs[] = { 208 &ddr_perf_cpumask_attr.attr, 209 NULL, 210 }; 211 212 static const struct attribute_group ddr_perf_cpumask_attr_group = { 213 .attrs = ddr_perf_cpumask_attrs, 214 }; 215 216 static ssize_t 217 ddr_pmu_event_show(struct device *dev, struct device_attribute *attr, 218 char *page) 219 { 220 struct perf_pmu_events_attr *pmu_attr; 221 222 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); 223 return sprintf(page, "event=0x%02llx\n", pmu_attr->id); 224 } 225 226 #define IMX8_DDR_PMU_EVENT_ATTR(_name, _id) \ 227 (&((struct perf_pmu_events_attr[]) { \ 228 { .attr = __ATTR(_name, 0444, ddr_pmu_event_show, NULL),\ 229 .id = _id, } \ 230 })[0].attr.attr) 231 232 static struct attribute *ddr_perf_events_attrs[] = { 233 IMX8_DDR_PMU_EVENT_ATTR(cycles, EVENT_CYCLES_ID), 234 IMX8_DDR_PMU_EVENT_ATTR(selfresh, 0x01), 235 IMX8_DDR_PMU_EVENT_ATTR(read-accesses, 0x04), 236 IMX8_DDR_PMU_EVENT_ATTR(write-accesses, 0x05), 237 IMX8_DDR_PMU_EVENT_ATTR(read-queue-depth, 0x08), 238 IMX8_DDR_PMU_EVENT_ATTR(write-queue-depth, 0x09), 239 IMX8_DDR_PMU_EVENT_ATTR(lp-read-credit-cnt, 0x10), 240 IMX8_DDR_PMU_EVENT_ATTR(hp-read-credit-cnt, 0x11), 241 IMX8_DDR_PMU_EVENT_ATTR(write-credit-cnt, 0x12), 242 IMX8_DDR_PMU_EVENT_ATTR(read-command, 0x20), 243 IMX8_DDR_PMU_EVENT_ATTR(write-command, 0x21), 244 IMX8_DDR_PMU_EVENT_ATTR(read-modify-write-command, 0x22), 245 IMX8_DDR_PMU_EVENT_ATTR(hp-read, 0x23), 246 IMX8_DDR_PMU_EVENT_ATTR(hp-req-nocredit, 0x24), 247 IMX8_DDR_PMU_EVENT_ATTR(hp-xact-credit, 0x25), 248 IMX8_DDR_PMU_EVENT_ATTR(lp-req-nocredit, 0x26), 249 IMX8_DDR_PMU_EVENT_ATTR(lp-xact-credit, 0x27), 250 IMX8_DDR_PMU_EVENT_ATTR(wr-xact-credit, 0x29), 251 IMX8_DDR_PMU_EVENT_ATTR(read-cycles, 0x2a), 252 IMX8_DDR_PMU_EVENT_ATTR(write-cycles, 0x2b), 253 IMX8_DDR_PMU_EVENT_ATTR(read-write-transition, 0x30), 254 IMX8_DDR_PMU_EVENT_ATTR(precharge, 0x31), 255 IMX8_DDR_PMU_EVENT_ATTR(activate, 0x32), 256 IMX8_DDR_PMU_EVENT_ATTR(load-mode, 0x33), 257 IMX8_DDR_PMU_EVENT_ATTR(perf-mwr, 0x34), 258 IMX8_DDR_PMU_EVENT_ATTR(read, 0x35), 259 IMX8_DDR_PMU_EVENT_ATTR(read-activate, 0x36), 260 IMX8_DDR_PMU_EVENT_ATTR(refresh, 0x37), 261 IMX8_DDR_PMU_EVENT_ATTR(write, 0x38), 262 IMX8_DDR_PMU_EVENT_ATTR(raw-hazard, 0x39), 263 IMX8_DDR_PMU_EVENT_ATTR(axid-read, 0x41), 264 IMX8_DDR_PMU_EVENT_ATTR(axid-write, 0x42), 265 NULL, 266 }; 267 268 static const struct attribute_group ddr_perf_events_attr_group = { 269 .name = "events", 270 .attrs = ddr_perf_events_attrs, 271 }; 272 273 PMU_FORMAT_ATTR(event, "config:0-7"); 274 PMU_FORMAT_ATTR(axi_id, "config1:0-15"); 275 PMU_FORMAT_ATTR(axi_mask, "config1:16-31"); 276 277 static struct attribute *ddr_perf_format_attrs[] = { 278 &format_attr_event.attr, 279 &format_attr_axi_id.attr, 280 &format_attr_axi_mask.attr, 281 NULL, 282 }; 283 284 static const struct attribute_group ddr_perf_format_attr_group = { 285 .name = "format", 286 .attrs = ddr_perf_format_attrs, 287 }; 288 289 static const struct attribute_group *attr_groups[] = { 290 &ddr_perf_events_attr_group, 291 &ddr_perf_format_attr_group, 292 &ddr_perf_cpumask_attr_group, 293 &ddr_perf_filter_cap_attr_group, 294 &ddr_perf_identifier_attr_group, 295 NULL, 296 }; 297 298 static bool ddr_perf_is_filtered(struct perf_event *event) 299 { 300 return event->attr.config == 0x41 || event->attr.config == 0x42; 301 } 302 303 static u32 ddr_perf_filter_val(struct perf_event *event) 304 { 305 return event->attr.config1; 306 } 307 308 static bool ddr_perf_filters_compatible(struct perf_event *a, 309 struct perf_event *b) 310 { 311 if (!ddr_perf_is_filtered(a)) 312 return true; 313 if (!ddr_perf_is_filtered(b)) 314 return true; 315 return ddr_perf_filter_val(a) == ddr_perf_filter_val(b); 316 } 317 318 static bool ddr_perf_is_enhanced_filtered(struct perf_event *event) 319 { 320 unsigned int filt; 321 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 322 323 filt = pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER_ENHANCED; 324 return (filt == DDR_CAP_AXI_ID_FILTER_ENHANCED) && 325 ddr_perf_is_filtered(event); 326 } 327 328 static u32 ddr_perf_alloc_counter(struct ddr_pmu *pmu, int event) 329 { 330 int i; 331 332 /* 333 * Always map cycle event to counter 0 334 * Cycles counter is dedicated for cycle event 335 * can't used for the other events 336 */ 337 if (event == EVENT_CYCLES_ID) { 338 if (pmu->events[EVENT_CYCLES_COUNTER] == NULL) 339 return EVENT_CYCLES_COUNTER; 340 else 341 return -ENOENT; 342 } 343 344 for (i = 1; i < NUM_COUNTERS; i++) { 345 if (pmu->events[i] == NULL) 346 return i; 347 } 348 349 return -ENOENT; 350 } 351 352 static void ddr_perf_free_counter(struct ddr_pmu *pmu, int counter) 353 { 354 pmu->events[counter] = NULL; 355 } 356 357 static u32 ddr_perf_read_counter(struct ddr_pmu *pmu, int counter) 358 { 359 struct perf_event *event = pmu->events[counter]; 360 void __iomem *base = pmu->base; 361 362 /* 363 * return bytes instead of bursts from ddr transaction for 364 * axid-read and axid-write event if PMU core supports enhanced 365 * filter. 366 */ 367 base += ddr_perf_is_enhanced_filtered(event) ? COUNTER_DPCR1 : 368 COUNTER_READ; 369 return readl_relaxed(base + counter * 4); 370 } 371 372 static int ddr_perf_event_init(struct perf_event *event) 373 { 374 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 375 struct hw_perf_event *hwc = &event->hw; 376 struct perf_event *sibling; 377 378 if (event->attr.type != event->pmu->type) 379 return -ENOENT; 380 381 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) 382 return -EOPNOTSUPP; 383 384 if (event->cpu < 0) { 385 dev_warn(pmu->dev, "Can't provide per-task data!\n"); 386 return -EOPNOTSUPP; 387 } 388 389 /* 390 * We must NOT create groups containing mixed PMUs, although software 391 * events are acceptable (for example to create a CCN group 392 * periodically read when a hrtimer aka cpu-clock leader triggers). 393 */ 394 if (event->group_leader->pmu != event->pmu && 395 !is_software_event(event->group_leader)) 396 return -EINVAL; 397 398 if (pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER) { 399 if (!ddr_perf_filters_compatible(event, event->group_leader)) 400 return -EINVAL; 401 for_each_sibling_event(sibling, event->group_leader) { 402 if (!ddr_perf_filters_compatible(event, sibling)) 403 return -EINVAL; 404 } 405 } 406 407 for_each_sibling_event(sibling, event->group_leader) { 408 if (sibling->pmu != event->pmu && 409 !is_software_event(sibling)) 410 return -EINVAL; 411 } 412 413 event->cpu = pmu->cpu; 414 hwc->idx = -1; 415 416 return 0; 417 } 418 419 static void ddr_perf_counter_enable(struct ddr_pmu *pmu, int config, 420 int counter, bool enable) 421 { 422 u8 reg = counter * 4 + COUNTER_CNTL; 423 int val; 424 425 if (enable) { 426 /* 427 * cycle counter is special which should firstly write 0 then 428 * write 1 into CLEAR bit to clear it. Other counters only 429 * need write 0 into CLEAR bit and it turns out to be 1 by 430 * hardware. Below enable flow is harmless for all counters. 431 */ 432 writel(0, pmu->base + reg); 433 val = CNTL_EN | CNTL_CLEAR; 434 val |= FIELD_PREP(CNTL_CSV_MASK, config); 435 writel(val, pmu->base + reg); 436 } else { 437 /* Disable counter */ 438 val = readl_relaxed(pmu->base + reg) & CNTL_EN_MASK; 439 writel(val, pmu->base + reg); 440 } 441 } 442 443 static bool ddr_perf_counter_overflow(struct ddr_pmu *pmu, int counter) 444 { 445 int val; 446 447 val = readl_relaxed(pmu->base + counter * 4 + COUNTER_CNTL); 448 449 return val & CNTL_OVER; 450 } 451 452 static void ddr_perf_counter_clear(struct ddr_pmu *pmu, int counter) 453 { 454 u8 reg = counter * 4 + COUNTER_CNTL; 455 int val; 456 457 val = readl_relaxed(pmu->base + reg); 458 val &= ~CNTL_CLEAR; 459 writel(val, pmu->base + reg); 460 461 val |= CNTL_CLEAR; 462 writel(val, pmu->base + reg); 463 } 464 465 static void ddr_perf_event_update(struct perf_event *event) 466 { 467 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 468 struct hw_perf_event *hwc = &event->hw; 469 u64 new_raw_count; 470 int counter = hwc->idx; 471 int ret; 472 473 new_raw_count = ddr_perf_read_counter(pmu, counter); 474 local64_add(new_raw_count, &event->count); 475 476 /* 477 * For legacy SoCs: event counter continue counting when overflow, 478 * no need to clear the counter. 479 * For new SoCs: event counter stop counting when overflow, need 480 * clear counter to let it count again. 481 */ 482 if (counter != EVENT_CYCLES_COUNTER) { 483 ret = ddr_perf_counter_overflow(pmu, counter); 484 if (ret) 485 dev_warn_ratelimited(pmu->dev, "events lost due to counter overflow (config 0x%llx)\n", 486 event->attr.config); 487 } 488 489 /* clear counter every time for both cycle counter and event counter */ 490 ddr_perf_counter_clear(pmu, counter); 491 } 492 493 static void ddr_perf_event_start(struct perf_event *event, int flags) 494 { 495 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 496 struct hw_perf_event *hwc = &event->hw; 497 int counter = hwc->idx; 498 499 local64_set(&hwc->prev_count, 0); 500 501 ddr_perf_counter_enable(pmu, event->attr.config, counter, true); 502 503 hwc->state = 0; 504 } 505 506 static int ddr_perf_event_add(struct perf_event *event, int flags) 507 { 508 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 509 struct hw_perf_event *hwc = &event->hw; 510 int counter; 511 int cfg = event->attr.config; 512 int cfg1 = event->attr.config1; 513 514 if (pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER) { 515 int i; 516 517 for (i = 1; i < NUM_COUNTERS; i++) { 518 if (pmu->events[i] && 519 !ddr_perf_filters_compatible(event, pmu->events[i])) 520 return -EINVAL; 521 } 522 523 if (ddr_perf_is_filtered(event)) { 524 /* revert axi id masking(axi_mask) value */ 525 cfg1 ^= AXI_MASKING_REVERT; 526 writel(cfg1, pmu->base + COUNTER_DPCR1); 527 } 528 } 529 530 counter = ddr_perf_alloc_counter(pmu, cfg); 531 if (counter < 0) { 532 dev_dbg(pmu->dev, "There are not enough counters\n"); 533 return -EOPNOTSUPP; 534 } 535 536 pmu->events[counter] = event; 537 pmu->active_events++; 538 hwc->idx = counter; 539 540 hwc->state |= PERF_HES_STOPPED; 541 542 if (flags & PERF_EF_START) 543 ddr_perf_event_start(event, flags); 544 545 return 0; 546 } 547 548 static void ddr_perf_event_stop(struct perf_event *event, int flags) 549 { 550 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 551 struct hw_perf_event *hwc = &event->hw; 552 int counter = hwc->idx; 553 554 ddr_perf_counter_enable(pmu, event->attr.config, counter, false); 555 ddr_perf_event_update(event); 556 557 hwc->state |= PERF_HES_STOPPED; 558 } 559 560 static void ddr_perf_event_del(struct perf_event *event, int flags) 561 { 562 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 563 struct hw_perf_event *hwc = &event->hw; 564 int counter = hwc->idx; 565 566 ddr_perf_event_stop(event, PERF_EF_UPDATE); 567 568 ddr_perf_free_counter(pmu, counter); 569 pmu->active_events--; 570 hwc->idx = -1; 571 } 572 573 static void ddr_perf_pmu_enable(struct pmu *pmu) 574 { 575 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 576 577 /* enable cycle counter if cycle is not active event list */ 578 if (ddr_pmu->events[EVENT_CYCLES_COUNTER] == NULL) 579 ddr_perf_counter_enable(ddr_pmu, 580 EVENT_CYCLES_ID, 581 EVENT_CYCLES_COUNTER, 582 true); 583 } 584 585 static void ddr_perf_pmu_disable(struct pmu *pmu) 586 { 587 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 588 589 if (ddr_pmu->events[EVENT_CYCLES_COUNTER] == NULL) 590 ddr_perf_counter_enable(ddr_pmu, 591 EVENT_CYCLES_ID, 592 EVENT_CYCLES_COUNTER, 593 false); 594 } 595 596 static int ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base, 597 struct device *dev) 598 { 599 *pmu = (struct ddr_pmu) { 600 .pmu = (struct pmu) { 601 .module = THIS_MODULE, 602 .capabilities = PERF_PMU_CAP_NO_EXCLUDE, 603 .task_ctx_nr = perf_invalid_context, 604 .attr_groups = attr_groups, 605 .event_init = ddr_perf_event_init, 606 .add = ddr_perf_event_add, 607 .del = ddr_perf_event_del, 608 .start = ddr_perf_event_start, 609 .stop = ddr_perf_event_stop, 610 .read = ddr_perf_event_update, 611 .pmu_enable = ddr_perf_pmu_enable, 612 .pmu_disable = ddr_perf_pmu_disable, 613 }, 614 .base = base, 615 .dev = dev, 616 }; 617 618 pmu->id = ida_simple_get(&ddr_ida, 0, 0, GFP_KERNEL); 619 return pmu->id; 620 } 621 622 static irqreturn_t ddr_perf_irq_handler(int irq, void *p) 623 { 624 int i; 625 struct ddr_pmu *pmu = (struct ddr_pmu *) p; 626 struct perf_event *event; 627 628 /* all counter will stop if cycle counter disabled */ 629 ddr_perf_counter_enable(pmu, 630 EVENT_CYCLES_ID, 631 EVENT_CYCLES_COUNTER, 632 false); 633 /* 634 * When the cycle counter overflows, all counters are stopped, 635 * and an IRQ is raised. If any other counter overflows, it 636 * continues counting, and no IRQ is raised. But for new SoCs, 637 * such as i.MX8MP, event counter would stop when overflow, so 638 * we need use cycle counter to stop overflow of event counter. 639 * 640 * Cycles occur at least 4 times as often as other events, so we 641 * can update all events on a cycle counter overflow and not 642 * lose events. 643 * 644 */ 645 for (i = 0; i < NUM_COUNTERS; i++) { 646 647 if (!pmu->events[i]) 648 continue; 649 650 event = pmu->events[i]; 651 652 ddr_perf_event_update(event); 653 } 654 655 ddr_perf_counter_enable(pmu, 656 EVENT_CYCLES_ID, 657 EVENT_CYCLES_COUNTER, 658 true); 659 660 return IRQ_HANDLED; 661 } 662 663 static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node) 664 { 665 struct ddr_pmu *pmu = hlist_entry_safe(node, struct ddr_pmu, node); 666 int target; 667 668 if (cpu != pmu->cpu) 669 return 0; 670 671 target = cpumask_any_but(cpu_online_mask, cpu); 672 if (target >= nr_cpu_ids) 673 return 0; 674 675 perf_pmu_migrate_context(&pmu->pmu, cpu, target); 676 pmu->cpu = target; 677 678 WARN_ON(irq_set_affinity_hint(pmu->irq, cpumask_of(pmu->cpu))); 679 680 return 0; 681 } 682 683 static int ddr_perf_probe(struct platform_device *pdev) 684 { 685 struct ddr_pmu *pmu; 686 struct device_node *np; 687 void __iomem *base; 688 char *name; 689 int num; 690 int ret; 691 int irq; 692 693 base = devm_platform_ioremap_resource(pdev, 0); 694 if (IS_ERR(base)) 695 return PTR_ERR(base); 696 697 np = pdev->dev.of_node; 698 699 pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL); 700 if (!pmu) 701 return -ENOMEM; 702 703 num = ddr_perf_init(pmu, base, &pdev->dev); 704 705 platform_set_drvdata(pdev, pmu); 706 707 name = devm_kasprintf(&pdev->dev, GFP_KERNEL, DDR_PERF_DEV_NAME "%d", 708 num); 709 if (!name) 710 return -ENOMEM; 711 712 pmu->devtype_data = of_device_get_match_data(&pdev->dev); 713 714 pmu->cpu = raw_smp_processor_id(); 715 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, 716 DDR_CPUHP_CB_NAME, 717 NULL, 718 ddr_perf_offline_cpu); 719 720 if (ret < 0) { 721 dev_err(&pdev->dev, "cpuhp_setup_state_multi failed\n"); 722 goto cpuhp_state_err; 723 } 724 725 pmu->cpuhp_state = ret; 726 727 /* Register the pmu instance for cpu hotplug */ 728 ret = cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node); 729 if (ret) { 730 dev_err(&pdev->dev, "Error %d registering hotplug\n", ret); 731 goto cpuhp_instance_err; 732 } 733 734 /* Request irq */ 735 irq = of_irq_get(np, 0); 736 if (irq < 0) { 737 dev_err(&pdev->dev, "Failed to get irq: %d", irq); 738 ret = irq; 739 goto ddr_perf_err; 740 } 741 742 ret = devm_request_irq(&pdev->dev, irq, 743 ddr_perf_irq_handler, 744 IRQF_NOBALANCING | IRQF_NO_THREAD, 745 DDR_CPUHP_CB_NAME, 746 pmu); 747 if (ret < 0) { 748 dev_err(&pdev->dev, "Request irq failed: %d", ret); 749 goto ddr_perf_err; 750 } 751 752 pmu->irq = irq; 753 ret = irq_set_affinity_hint(pmu->irq, cpumask_of(pmu->cpu)); 754 if (ret) { 755 dev_err(pmu->dev, "Failed to set interrupt affinity!\n"); 756 goto ddr_perf_err; 757 } 758 759 ret = perf_pmu_register(&pmu->pmu, name, -1); 760 if (ret) 761 goto ddr_perf_err; 762 763 return 0; 764 765 ddr_perf_err: 766 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); 767 cpuhp_instance_err: 768 cpuhp_remove_multi_state(pmu->cpuhp_state); 769 cpuhp_state_err: 770 ida_simple_remove(&ddr_ida, pmu->id); 771 dev_warn(&pdev->dev, "i.MX8 DDR Perf PMU failed (%d), disabled\n", ret); 772 return ret; 773 } 774 775 static int ddr_perf_remove(struct platform_device *pdev) 776 { 777 struct ddr_pmu *pmu = platform_get_drvdata(pdev); 778 779 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); 780 cpuhp_remove_multi_state(pmu->cpuhp_state); 781 irq_set_affinity_hint(pmu->irq, NULL); 782 783 perf_pmu_unregister(&pmu->pmu); 784 785 ida_simple_remove(&ddr_ida, pmu->id); 786 return 0; 787 } 788 789 static struct platform_driver imx_ddr_pmu_driver = { 790 .driver = { 791 .name = "imx-ddr-pmu", 792 .of_match_table = imx_ddr_pmu_dt_ids, 793 .suppress_bind_attrs = true, 794 }, 795 .probe = ddr_perf_probe, 796 .remove = ddr_perf_remove, 797 }; 798 799 module_platform_driver(imx_ddr_pmu_driver); 800 MODULE_LICENSE("GPL v2"); 801