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 }; 54 55 static const struct fsl_ddr_devtype_data imx8_devtype_data; 56 57 static const struct fsl_ddr_devtype_data imx8m_devtype_data = { 58 .quirks = DDR_CAP_AXI_ID_FILTER, 59 }; 60 61 static const struct fsl_ddr_devtype_data imx8mp_devtype_data = { 62 .quirks = DDR_CAP_AXI_ID_FILTER_ENHANCED, 63 }; 64 65 static const struct of_device_id imx_ddr_pmu_dt_ids[] = { 66 { .compatible = "fsl,imx8-ddr-pmu", .data = &imx8_devtype_data}, 67 { .compatible = "fsl,imx8m-ddr-pmu", .data = &imx8m_devtype_data}, 68 { .compatible = "fsl,imx8mp-ddr-pmu", .data = &imx8mp_devtype_data}, 69 { /* sentinel */ } 70 }; 71 MODULE_DEVICE_TABLE(of, imx_ddr_pmu_dt_ids); 72 73 struct ddr_pmu { 74 struct pmu pmu; 75 void __iomem *base; 76 unsigned int cpu; 77 struct hlist_node node; 78 struct device *dev; 79 struct perf_event *events[NUM_COUNTERS]; 80 int active_events; 81 enum cpuhp_state cpuhp_state; 82 const struct fsl_ddr_devtype_data *devtype_data; 83 int irq; 84 int id; 85 }; 86 87 enum ddr_perf_filter_capabilities { 88 PERF_CAP_AXI_ID_FILTER = 0, 89 PERF_CAP_AXI_ID_FILTER_ENHANCED, 90 PERF_CAP_AXI_ID_FEAT_MAX, 91 }; 92 93 static u32 ddr_perf_filter_cap_get(struct ddr_pmu *pmu, int cap) 94 { 95 u32 quirks = pmu->devtype_data->quirks; 96 97 switch (cap) { 98 case PERF_CAP_AXI_ID_FILTER: 99 return !!(quirks & DDR_CAP_AXI_ID_FILTER); 100 case PERF_CAP_AXI_ID_FILTER_ENHANCED: 101 quirks &= DDR_CAP_AXI_ID_FILTER_ENHANCED; 102 return quirks == DDR_CAP_AXI_ID_FILTER_ENHANCED; 103 default: 104 WARN(1, "unknown filter cap %d\n", cap); 105 } 106 107 return 0; 108 } 109 110 static ssize_t ddr_perf_filter_cap_show(struct device *dev, 111 struct device_attribute *attr, 112 char *buf) 113 { 114 struct ddr_pmu *pmu = dev_get_drvdata(dev); 115 struct dev_ext_attribute *ea = 116 container_of(attr, struct dev_ext_attribute, attr); 117 int cap = (long)ea->var; 118 119 return snprintf(buf, PAGE_SIZE, "%u\n", 120 ddr_perf_filter_cap_get(pmu, cap)); 121 } 122 123 #define PERF_EXT_ATTR_ENTRY(_name, _func, _var) \ 124 (&((struct dev_ext_attribute) { \ 125 __ATTR(_name, 0444, _func, NULL), (void *)_var \ 126 }).attr.attr) 127 128 #define PERF_FILTER_EXT_ATTR_ENTRY(_name, _var) \ 129 PERF_EXT_ATTR_ENTRY(_name, ddr_perf_filter_cap_show, _var) 130 131 static struct attribute *ddr_perf_filter_cap_attr[] = { 132 PERF_FILTER_EXT_ATTR_ENTRY(filter, PERF_CAP_AXI_ID_FILTER), 133 PERF_FILTER_EXT_ATTR_ENTRY(enhanced_filter, PERF_CAP_AXI_ID_FILTER_ENHANCED), 134 NULL, 135 }; 136 137 static struct attribute_group ddr_perf_filter_cap_attr_group = { 138 .name = "caps", 139 .attrs = ddr_perf_filter_cap_attr, 140 }; 141 142 static ssize_t ddr_perf_cpumask_show(struct device *dev, 143 struct device_attribute *attr, char *buf) 144 { 145 struct ddr_pmu *pmu = dev_get_drvdata(dev); 146 147 return cpumap_print_to_pagebuf(true, buf, cpumask_of(pmu->cpu)); 148 } 149 150 static struct device_attribute ddr_perf_cpumask_attr = 151 __ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL); 152 153 static struct attribute *ddr_perf_cpumask_attrs[] = { 154 &ddr_perf_cpumask_attr.attr, 155 NULL, 156 }; 157 158 static struct attribute_group ddr_perf_cpumask_attr_group = { 159 .attrs = ddr_perf_cpumask_attrs, 160 }; 161 162 static ssize_t 163 ddr_pmu_event_show(struct device *dev, struct device_attribute *attr, 164 char *page) 165 { 166 struct perf_pmu_events_attr *pmu_attr; 167 168 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); 169 return sprintf(page, "event=0x%02llx\n", pmu_attr->id); 170 } 171 172 #define IMX8_DDR_PMU_EVENT_ATTR(_name, _id) \ 173 (&((struct perf_pmu_events_attr[]) { \ 174 { .attr = __ATTR(_name, 0444, ddr_pmu_event_show, NULL),\ 175 .id = _id, } \ 176 })[0].attr.attr) 177 178 static struct attribute *ddr_perf_events_attrs[] = { 179 IMX8_DDR_PMU_EVENT_ATTR(cycles, EVENT_CYCLES_ID), 180 IMX8_DDR_PMU_EVENT_ATTR(selfresh, 0x01), 181 IMX8_DDR_PMU_EVENT_ATTR(read-accesses, 0x04), 182 IMX8_DDR_PMU_EVENT_ATTR(write-accesses, 0x05), 183 IMX8_DDR_PMU_EVENT_ATTR(read-queue-depth, 0x08), 184 IMX8_DDR_PMU_EVENT_ATTR(write-queue-depth, 0x09), 185 IMX8_DDR_PMU_EVENT_ATTR(lp-read-credit-cnt, 0x10), 186 IMX8_DDR_PMU_EVENT_ATTR(hp-read-credit-cnt, 0x11), 187 IMX8_DDR_PMU_EVENT_ATTR(write-credit-cnt, 0x12), 188 IMX8_DDR_PMU_EVENT_ATTR(read-command, 0x20), 189 IMX8_DDR_PMU_EVENT_ATTR(write-command, 0x21), 190 IMX8_DDR_PMU_EVENT_ATTR(read-modify-write-command, 0x22), 191 IMX8_DDR_PMU_EVENT_ATTR(hp-read, 0x23), 192 IMX8_DDR_PMU_EVENT_ATTR(hp-req-nocredit, 0x24), 193 IMX8_DDR_PMU_EVENT_ATTR(hp-xact-credit, 0x25), 194 IMX8_DDR_PMU_EVENT_ATTR(lp-req-nocredit, 0x26), 195 IMX8_DDR_PMU_EVENT_ATTR(lp-xact-credit, 0x27), 196 IMX8_DDR_PMU_EVENT_ATTR(wr-xact-credit, 0x29), 197 IMX8_DDR_PMU_EVENT_ATTR(read-cycles, 0x2a), 198 IMX8_DDR_PMU_EVENT_ATTR(write-cycles, 0x2b), 199 IMX8_DDR_PMU_EVENT_ATTR(read-write-transition, 0x30), 200 IMX8_DDR_PMU_EVENT_ATTR(precharge, 0x31), 201 IMX8_DDR_PMU_EVENT_ATTR(activate, 0x32), 202 IMX8_DDR_PMU_EVENT_ATTR(load-mode, 0x33), 203 IMX8_DDR_PMU_EVENT_ATTR(perf-mwr, 0x34), 204 IMX8_DDR_PMU_EVENT_ATTR(read, 0x35), 205 IMX8_DDR_PMU_EVENT_ATTR(read-activate, 0x36), 206 IMX8_DDR_PMU_EVENT_ATTR(refresh, 0x37), 207 IMX8_DDR_PMU_EVENT_ATTR(write, 0x38), 208 IMX8_DDR_PMU_EVENT_ATTR(raw-hazard, 0x39), 209 IMX8_DDR_PMU_EVENT_ATTR(axid-read, 0x41), 210 IMX8_DDR_PMU_EVENT_ATTR(axid-write, 0x42), 211 NULL, 212 }; 213 214 static struct attribute_group ddr_perf_events_attr_group = { 215 .name = "events", 216 .attrs = ddr_perf_events_attrs, 217 }; 218 219 PMU_FORMAT_ATTR(event, "config:0-7"); 220 PMU_FORMAT_ATTR(axi_id, "config1:0-15"); 221 PMU_FORMAT_ATTR(axi_mask, "config1:16-31"); 222 223 static struct attribute *ddr_perf_format_attrs[] = { 224 &format_attr_event.attr, 225 &format_attr_axi_id.attr, 226 &format_attr_axi_mask.attr, 227 NULL, 228 }; 229 230 static struct attribute_group ddr_perf_format_attr_group = { 231 .name = "format", 232 .attrs = ddr_perf_format_attrs, 233 }; 234 235 static const struct attribute_group *attr_groups[] = { 236 &ddr_perf_events_attr_group, 237 &ddr_perf_format_attr_group, 238 &ddr_perf_cpumask_attr_group, 239 &ddr_perf_filter_cap_attr_group, 240 NULL, 241 }; 242 243 static bool ddr_perf_is_filtered(struct perf_event *event) 244 { 245 return event->attr.config == 0x41 || event->attr.config == 0x42; 246 } 247 248 static u32 ddr_perf_filter_val(struct perf_event *event) 249 { 250 return event->attr.config1; 251 } 252 253 static bool ddr_perf_filters_compatible(struct perf_event *a, 254 struct perf_event *b) 255 { 256 if (!ddr_perf_is_filtered(a)) 257 return true; 258 if (!ddr_perf_is_filtered(b)) 259 return true; 260 return ddr_perf_filter_val(a) == ddr_perf_filter_val(b); 261 } 262 263 static bool ddr_perf_is_enhanced_filtered(struct perf_event *event) 264 { 265 unsigned int filt; 266 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 267 268 filt = pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER_ENHANCED; 269 return (filt == DDR_CAP_AXI_ID_FILTER_ENHANCED) && 270 ddr_perf_is_filtered(event); 271 } 272 273 static u32 ddr_perf_alloc_counter(struct ddr_pmu *pmu, int event) 274 { 275 int i; 276 277 /* 278 * Always map cycle event to counter 0 279 * Cycles counter is dedicated for cycle event 280 * can't used for the other events 281 */ 282 if (event == EVENT_CYCLES_ID) { 283 if (pmu->events[EVENT_CYCLES_COUNTER] == NULL) 284 return EVENT_CYCLES_COUNTER; 285 else 286 return -ENOENT; 287 } 288 289 for (i = 1; i < NUM_COUNTERS; i++) { 290 if (pmu->events[i] == NULL) 291 return i; 292 } 293 294 return -ENOENT; 295 } 296 297 static void ddr_perf_free_counter(struct ddr_pmu *pmu, int counter) 298 { 299 pmu->events[counter] = NULL; 300 } 301 302 static u32 ddr_perf_read_counter(struct ddr_pmu *pmu, int counter) 303 { 304 struct perf_event *event = pmu->events[counter]; 305 void __iomem *base = pmu->base; 306 307 /* 308 * return bytes instead of bursts from ddr transaction for 309 * axid-read and axid-write event if PMU core supports enhanced 310 * filter. 311 */ 312 base += ddr_perf_is_enhanced_filtered(event) ? COUNTER_DPCR1 : 313 COUNTER_READ; 314 return readl_relaxed(base + counter * 4); 315 } 316 317 static int ddr_perf_event_init(struct perf_event *event) 318 { 319 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 320 struct hw_perf_event *hwc = &event->hw; 321 struct perf_event *sibling; 322 323 if (event->attr.type != event->pmu->type) 324 return -ENOENT; 325 326 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) 327 return -EOPNOTSUPP; 328 329 if (event->cpu < 0) { 330 dev_warn(pmu->dev, "Can't provide per-task data!\n"); 331 return -EOPNOTSUPP; 332 } 333 334 /* 335 * We must NOT create groups containing mixed PMUs, although software 336 * events are acceptable (for example to create a CCN group 337 * periodically read when a hrtimer aka cpu-clock leader triggers). 338 */ 339 if (event->group_leader->pmu != event->pmu && 340 !is_software_event(event->group_leader)) 341 return -EINVAL; 342 343 if (pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER) { 344 if (!ddr_perf_filters_compatible(event, event->group_leader)) 345 return -EINVAL; 346 for_each_sibling_event(sibling, event->group_leader) { 347 if (!ddr_perf_filters_compatible(event, sibling)) 348 return -EINVAL; 349 } 350 } 351 352 for_each_sibling_event(sibling, event->group_leader) { 353 if (sibling->pmu != event->pmu && 354 !is_software_event(sibling)) 355 return -EINVAL; 356 } 357 358 event->cpu = pmu->cpu; 359 hwc->idx = -1; 360 361 return 0; 362 } 363 364 365 static void ddr_perf_event_update(struct perf_event *event) 366 { 367 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 368 struct hw_perf_event *hwc = &event->hw; 369 u64 delta, prev_raw_count, new_raw_count; 370 int counter = hwc->idx; 371 372 do { 373 prev_raw_count = local64_read(&hwc->prev_count); 374 new_raw_count = ddr_perf_read_counter(pmu, counter); 375 } while (local64_cmpxchg(&hwc->prev_count, prev_raw_count, 376 new_raw_count) != prev_raw_count); 377 378 delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF; 379 380 local64_add(delta, &event->count); 381 } 382 383 static void ddr_perf_counter_enable(struct ddr_pmu *pmu, int config, 384 int counter, bool enable) 385 { 386 u8 reg = counter * 4 + COUNTER_CNTL; 387 int val; 388 389 if (enable) { 390 /* 391 * must disable first, then enable again 392 * otherwise, cycle counter will not work 393 * if previous state is enabled. 394 */ 395 writel(0, pmu->base + reg); 396 val = CNTL_EN | CNTL_CLEAR; 397 val |= FIELD_PREP(CNTL_CSV_MASK, config); 398 writel(val, pmu->base + reg); 399 } else { 400 /* Disable counter */ 401 writel(0, pmu->base + reg); 402 } 403 } 404 405 static void ddr_perf_event_start(struct perf_event *event, int flags) 406 { 407 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 408 struct hw_perf_event *hwc = &event->hw; 409 int counter = hwc->idx; 410 411 local64_set(&hwc->prev_count, 0); 412 413 ddr_perf_counter_enable(pmu, event->attr.config, counter, true); 414 415 hwc->state = 0; 416 } 417 418 static int ddr_perf_event_add(struct perf_event *event, int flags) 419 { 420 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 421 struct hw_perf_event *hwc = &event->hw; 422 int counter; 423 int cfg = event->attr.config; 424 int cfg1 = event->attr.config1; 425 426 if (pmu->devtype_data->quirks & DDR_CAP_AXI_ID_FILTER) { 427 int i; 428 429 for (i = 1; i < NUM_COUNTERS; i++) { 430 if (pmu->events[i] && 431 !ddr_perf_filters_compatible(event, pmu->events[i])) 432 return -EINVAL; 433 } 434 435 if (ddr_perf_is_filtered(event)) { 436 /* revert axi id masking(axi_mask) value */ 437 cfg1 ^= AXI_MASKING_REVERT; 438 writel(cfg1, pmu->base + COUNTER_DPCR1); 439 } 440 } 441 442 counter = ddr_perf_alloc_counter(pmu, cfg); 443 if (counter < 0) { 444 dev_dbg(pmu->dev, "There are not enough counters\n"); 445 return -EOPNOTSUPP; 446 } 447 448 pmu->events[counter] = event; 449 pmu->active_events++; 450 hwc->idx = counter; 451 452 hwc->state |= PERF_HES_STOPPED; 453 454 if (flags & PERF_EF_START) 455 ddr_perf_event_start(event, flags); 456 457 return 0; 458 } 459 460 static void ddr_perf_event_stop(struct perf_event *event, int flags) 461 { 462 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 463 struct hw_perf_event *hwc = &event->hw; 464 int counter = hwc->idx; 465 466 ddr_perf_counter_enable(pmu, event->attr.config, counter, false); 467 ddr_perf_event_update(event); 468 469 hwc->state |= PERF_HES_STOPPED; 470 } 471 472 static void ddr_perf_event_del(struct perf_event *event, int flags) 473 { 474 struct ddr_pmu *pmu = to_ddr_pmu(event->pmu); 475 struct hw_perf_event *hwc = &event->hw; 476 int counter = hwc->idx; 477 478 ddr_perf_event_stop(event, PERF_EF_UPDATE); 479 480 ddr_perf_free_counter(pmu, counter); 481 pmu->active_events--; 482 hwc->idx = -1; 483 } 484 485 static void ddr_perf_pmu_enable(struct pmu *pmu) 486 { 487 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 488 489 /* enable cycle counter if cycle is not active event list */ 490 if (ddr_pmu->events[EVENT_CYCLES_COUNTER] == NULL) 491 ddr_perf_counter_enable(ddr_pmu, 492 EVENT_CYCLES_ID, 493 EVENT_CYCLES_COUNTER, 494 true); 495 } 496 497 static void ddr_perf_pmu_disable(struct pmu *pmu) 498 { 499 struct ddr_pmu *ddr_pmu = to_ddr_pmu(pmu); 500 501 if (ddr_pmu->events[EVENT_CYCLES_COUNTER] == NULL) 502 ddr_perf_counter_enable(ddr_pmu, 503 EVENT_CYCLES_ID, 504 EVENT_CYCLES_COUNTER, 505 false); 506 } 507 508 static int ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base, 509 struct device *dev) 510 { 511 *pmu = (struct ddr_pmu) { 512 .pmu = (struct pmu) { 513 .capabilities = PERF_PMU_CAP_NO_EXCLUDE, 514 .task_ctx_nr = perf_invalid_context, 515 .attr_groups = attr_groups, 516 .event_init = ddr_perf_event_init, 517 .add = ddr_perf_event_add, 518 .del = ddr_perf_event_del, 519 .start = ddr_perf_event_start, 520 .stop = ddr_perf_event_stop, 521 .read = ddr_perf_event_update, 522 .pmu_enable = ddr_perf_pmu_enable, 523 .pmu_disable = ddr_perf_pmu_disable, 524 }, 525 .base = base, 526 .dev = dev, 527 }; 528 529 pmu->id = ida_simple_get(&ddr_ida, 0, 0, GFP_KERNEL); 530 return pmu->id; 531 } 532 533 static irqreturn_t ddr_perf_irq_handler(int irq, void *p) 534 { 535 int i; 536 struct ddr_pmu *pmu = (struct ddr_pmu *) p; 537 struct perf_event *event, *cycle_event = NULL; 538 539 /* all counter will stop if cycle counter disabled */ 540 ddr_perf_counter_enable(pmu, 541 EVENT_CYCLES_ID, 542 EVENT_CYCLES_COUNTER, 543 false); 544 /* 545 * When the cycle counter overflows, all counters are stopped, 546 * and an IRQ is raised. If any other counter overflows, it 547 * continues counting, and no IRQ is raised. 548 * 549 * Cycles occur at least 4 times as often as other events, so we 550 * can update all events on a cycle counter overflow and not 551 * lose events. 552 * 553 */ 554 for (i = 0; i < NUM_COUNTERS; i++) { 555 556 if (!pmu->events[i]) 557 continue; 558 559 event = pmu->events[i]; 560 561 ddr_perf_event_update(event); 562 563 if (event->hw.idx == EVENT_CYCLES_COUNTER) 564 cycle_event = event; 565 } 566 567 ddr_perf_counter_enable(pmu, 568 EVENT_CYCLES_ID, 569 EVENT_CYCLES_COUNTER, 570 true); 571 if (cycle_event) 572 ddr_perf_event_update(cycle_event); 573 574 return IRQ_HANDLED; 575 } 576 577 static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node) 578 { 579 struct ddr_pmu *pmu = hlist_entry_safe(node, struct ddr_pmu, node); 580 int target; 581 582 if (cpu != pmu->cpu) 583 return 0; 584 585 target = cpumask_any_but(cpu_online_mask, cpu); 586 if (target >= nr_cpu_ids) 587 return 0; 588 589 perf_pmu_migrate_context(&pmu->pmu, cpu, target); 590 pmu->cpu = target; 591 592 WARN_ON(irq_set_affinity_hint(pmu->irq, cpumask_of(pmu->cpu))); 593 594 return 0; 595 } 596 597 static int ddr_perf_probe(struct platform_device *pdev) 598 { 599 struct ddr_pmu *pmu; 600 struct device_node *np; 601 void __iomem *base; 602 char *name; 603 int num; 604 int ret; 605 int irq; 606 607 base = devm_platform_ioremap_resource(pdev, 0); 608 if (IS_ERR(base)) 609 return PTR_ERR(base); 610 611 np = pdev->dev.of_node; 612 613 pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL); 614 if (!pmu) 615 return -ENOMEM; 616 617 num = ddr_perf_init(pmu, base, &pdev->dev); 618 619 platform_set_drvdata(pdev, pmu); 620 621 name = devm_kasprintf(&pdev->dev, GFP_KERNEL, DDR_PERF_DEV_NAME "%d", 622 num); 623 if (!name) 624 return -ENOMEM; 625 626 pmu->devtype_data = of_device_get_match_data(&pdev->dev); 627 628 pmu->cpu = raw_smp_processor_id(); 629 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, 630 DDR_CPUHP_CB_NAME, 631 NULL, 632 ddr_perf_offline_cpu); 633 634 if (ret < 0) { 635 dev_err(&pdev->dev, "cpuhp_setup_state_multi failed\n"); 636 goto cpuhp_state_err; 637 } 638 639 pmu->cpuhp_state = ret; 640 641 /* Register the pmu instance for cpu hotplug */ 642 ret = cpuhp_state_add_instance_nocalls(pmu->cpuhp_state, &pmu->node); 643 if (ret) { 644 dev_err(&pdev->dev, "Error %d registering hotplug\n", ret); 645 goto cpuhp_instance_err; 646 } 647 648 /* Request irq */ 649 irq = of_irq_get(np, 0); 650 if (irq < 0) { 651 dev_err(&pdev->dev, "Failed to get irq: %d", irq); 652 ret = irq; 653 goto ddr_perf_err; 654 } 655 656 ret = devm_request_irq(&pdev->dev, irq, 657 ddr_perf_irq_handler, 658 IRQF_NOBALANCING | IRQF_NO_THREAD, 659 DDR_CPUHP_CB_NAME, 660 pmu); 661 if (ret < 0) { 662 dev_err(&pdev->dev, "Request irq failed: %d", ret); 663 goto ddr_perf_err; 664 } 665 666 pmu->irq = irq; 667 ret = irq_set_affinity_hint(pmu->irq, cpumask_of(pmu->cpu)); 668 if (ret) { 669 dev_err(pmu->dev, "Failed to set interrupt affinity!\n"); 670 goto ddr_perf_err; 671 } 672 673 ret = perf_pmu_register(&pmu->pmu, name, -1); 674 if (ret) 675 goto ddr_perf_err; 676 677 return 0; 678 679 ddr_perf_err: 680 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); 681 cpuhp_instance_err: 682 cpuhp_remove_multi_state(pmu->cpuhp_state); 683 cpuhp_state_err: 684 ida_simple_remove(&ddr_ida, pmu->id); 685 dev_warn(&pdev->dev, "i.MX8 DDR Perf PMU failed (%d), disabled\n", ret); 686 return ret; 687 } 688 689 static int ddr_perf_remove(struct platform_device *pdev) 690 { 691 struct ddr_pmu *pmu = platform_get_drvdata(pdev); 692 693 cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); 694 cpuhp_remove_multi_state(pmu->cpuhp_state); 695 irq_set_affinity_hint(pmu->irq, NULL); 696 697 perf_pmu_unregister(&pmu->pmu); 698 699 ida_simple_remove(&ddr_ida, pmu->id); 700 return 0; 701 } 702 703 static struct platform_driver imx_ddr_pmu_driver = { 704 .driver = { 705 .name = "imx-ddr-pmu", 706 .of_match_table = imx_ddr_pmu_dt_ids, 707 }, 708 .probe = ddr_perf_probe, 709 .remove = ddr_perf_remove, 710 }; 711 712 module_platform_driver(imx_ddr_pmu_driver); 713 MODULE_LICENSE("GPL v2"); 714