1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2022-2024 Arm Limited 3 // NI-700 Network-on-Chip PMU driver 4 5 #include <linux/acpi.h> 6 #include <linux/bitfield.h> 7 #include <linux/interrupt.h> 8 #include <linux/io.h> 9 #include <linux/io-64-nonatomic-lo-hi.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/perf_event.h> 14 #include <linux/platform_device.h> 15 #include <linux/slab.h> 16 17 /* Common registers */ 18 #define NI_NODE_TYPE 0x000 19 #define NI_NODE_TYPE_NODE_ID GENMASK(31, 16) 20 #define NI_NODE_TYPE_NODE_TYPE GENMASK(15, 0) 21 22 #define NI_CHILD_NODE_INFO 0x004 23 #define NI_CHILD_PTR(n) (0x008 + (n) * 4) 24 25 #define NI700_PMUSELA 0x00c 26 27 /* Config node */ 28 #define NI_PERIPHERAL_ID0 0xfe0 29 #define NI_PIDR0_PART_7_0 GENMASK(7, 0) 30 #define NI_PERIPHERAL_ID1 0xfe4 31 #define NI_PIDR1_PART_11_8 GENMASK(3, 0) 32 #define NI_PERIPHERAL_ID2 0xfe8 33 #define NI_PIDR2_VERSION GENMASK(7, 4) 34 35 /* PMU node */ 36 #define NI_PMEVCNTR(n) (0x008 + (n) * 8) 37 #define NI_PMCCNTR_L 0x0f8 38 #define NI_PMCCNTR_U 0x0fc 39 #define NI_PMEVTYPER(n) (0x400 + (n) * 4) 40 #define NI_PMEVTYPER_NODE_TYPE GENMASK(12, 9) 41 #define NI_PMEVTYPER_NODE_ID GENMASK(8, 0) 42 #define NI_PMCNTENSET 0xc00 43 #define NI_PMCNTENCLR 0xc20 44 #define NI_PMINTENSET 0xc40 45 #define NI_PMINTENCLR 0xc60 46 #define NI_PMOVSCLR 0xc80 47 #define NI_PMOVSSET 0xcc0 48 #define NI_PMCFGR 0xe00 49 #define NI_PMCR 0xe04 50 #define NI_PMCR_RESET_CCNT BIT(2) 51 #define NI_PMCR_RESET_EVCNT BIT(1) 52 #define NI_PMCR_ENABLE BIT(0) 53 54 #define NI_NUM_COUNTERS 8 55 #define NI_CCNT_IDX 31 56 57 /* Event attributes */ 58 #define NI_CONFIG_TYPE GENMASK_ULL(15, 0) 59 #define NI_CONFIG_NODEID GENMASK_ULL(31, 16) 60 #define NI_CONFIG_EVENTID GENMASK_ULL(47, 32) 61 62 #define NI_EVENT_TYPE(event) FIELD_GET(NI_CONFIG_TYPE, (event)->attr.config) 63 #define NI_EVENT_NODEID(event) FIELD_GET(NI_CONFIG_NODEID, (event)->attr.config) 64 #define NI_EVENT_EVENTID(event) FIELD_GET(NI_CONFIG_EVENTID, (event)->attr.config) 65 66 enum ni_part { 67 PART_NI_700 = 0x43b, 68 PART_NI_710AE = 0x43d, 69 }; 70 71 enum ni_node_type { 72 NI_GLOBAL, 73 NI_VOLTAGE, 74 NI_POWER, 75 NI_CLOCK, 76 NI_ASNI, 77 NI_AMNI, 78 NI_PMU, 79 NI_HSNI, 80 NI_HMNI, 81 NI_PMNI, 82 }; 83 84 struct arm_ni_node { 85 void __iomem *base; 86 enum ni_node_type type; 87 u16 id; 88 u32 num_components; 89 }; 90 91 struct arm_ni_unit { 92 void __iomem *pmusela; 93 enum ni_node_type type; 94 u16 id; 95 bool ns; 96 union { 97 __le64 pmusel; 98 u8 event[8]; 99 }; 100 }; 101 102 struct arm_ni_cd { 103 void __iomem *pmu_base; 104 u16 id; 105 int num_units; 106 int irq; 107 int cpu; 108 struct hlist_node cpuhp_node; 109 struct pmu pmu; 110 struct arm_ni_unit *units; 111 struct perf_event *evcnt[NI_NUM_COUNTERS]; 112 struct perf_event *ccnt; 113 }; 114 115 struct arm_ni { 116 struct device *dev; 117 void __iomem *base; 118 enum ni_part part; 119 int id; 120 int num_cds; 121 struct arm_ni_cd cds[] __counted_by(num_cds); 122 }; 123 124 #define cd_to_ni(cd) container_of((cd), struct arm_ni, cds[(cd)->id]) 125 #define pmu_to_cd(p) container_of((p), struct arm_ni_cd, pmu) 126 127 #define cd_for_each_unit(cd, u) \ 128 for (struct arm_ni_unit *u = cd->units; u < cd->units + cd->num_units; u++) 129 130 static int arm_ni_hp_state; 131 132 struct arm_ni_event_attr { 133 struct device_attribute attr; 134 enum ni_node_type type; 135 }; 136 137 #define NI_EVENT_ATTR(_name, _type) \ 138 (&((struct arm_ni_event_attr[]) {{ \ 139 .attr = __ATTR(_name, 0444, arm_ni_event_show, NULL), \ 140 .type = _type, \ 141 }})[0].attr.attr) 142 143 static ssize_t arm_ni_event_show(struct device *dev, 144 struct device_attribute *attr, char *buf) 145 { 146 struct arm_ni_event_attr *eattr = container_of(attr, typeof(*eattr), attr); 147 148 if (eattr->type == NI_PMU) 149 return sysfs_emit(buf, "type=0x%x\n", eattr->type); 150 151 return sysfs_emit(buf, "type=0x%x,eventid=?,nodeid=?\n", eattr->type); 152 } 153 154 static umode_t arm_ni_event_attr_is_visible(struct kobject *kobj, 155 struct attribute *attr, int unused) 156 { 157 struct device *dev = kobj_to_dev(kobj); 158 struct arm_ni_cd *cd = pmu_to_cd(dev_get_drvdata(dev)); 159 struct arm_ni_event_attr *eattr; 160 161 eattr = container_of(attr, typeof(*eattr), attr.attr); 162 163 cd_for_each_unit(cd, unit) { 164 if (unit->type == eattr->type && unit->ns) 165 return attr->mode; 166 } 167 168 return 0; 169 } 170 171 static struct attribute *arm_ni_event_attrs[] = { 172 NI_EVENT_ATTR(asni, NI_ASNI), 173 NI_EVENT_ATTR(amni, NI_AMNI), 174 NI_EVENT_ATTR(cycles, NI_PMU), 175 NI_EVENT_ATTR(hsni, NI_HSNI), 176 NI_EVENT_ATTR(hmni, NI_HMNI), 177 NI_EVENT_ATTR(pmni, NI_PMNI), 178 NULL 179 }; 180 181 static const struct attribute_group arm_ni_event_attrs_group = { 182 .name = "events", 183 .attrs = arm_ni_event_attrs, 184 .is_visible = arm_ni_event_attr_is_visible, 185 }; 186 187 struct arm_ni_format_attr { 188 struct device_attribute attr; 189 u64 field; 190 }; 191 192 #define NI_FORMAT_ATTR(_name, _fld) \ 193 (&((struct arm_ni_format_attr[]) {{ \ 194 .attr = __ATTR(_name, 0444, arm_ni_format_show, NULL), \ 195 .field = _fld, \ 196 }})[0].attr.attr) 197 198 static ssize_t arm_ni_format_show(struct device *dev, 199 struct device_attribute *attr, char *buf) 200 { 201 struct arm_ni_format_attr *fmt = container_of(attr, typeof(*fmt), attr); 202 203 return sysfs_emit(buf, "config:%*pbl\n", 64, &fmt->field); 204 } 205 206 static struct attribute *arm_ni_format_attrs[] = { 207 NI_FORMAT_ATTR(type, NI_CONFIG_TYPE), 208 NI_FORMAT_ATTR(nodeid, NI_CONFIG_NODEID), 209 NI_FORMAT_ATTR(eventid, NI_CONFIG_EVENTID), 210 NULL 211 }; 212 213 static const struct attribute_group arm_ni_format_attrs_group = { 214 .name = "format", 215 .attrs = arm_ni_format_attrs, 216 }; 217 218 static ssize_t arm_ni_cpumask_show(struct device *dev, 219 struct device_attribute *attr, char *buf) 220 { 221 struct arm_ni_cd *cd = pmu_to_cd(dev_get_drvdata(dev)); 222 223 return cpumap_print_to_pagebuf(true, buf, cpumask_of(cd->cpu)); 224 } 225 226 static struct device_attribute arm_ni_cpumask_attr = 227 __ATTR(cpumask, 0444, arm_ni_cpumask_show, NULL); 228 229 static ssize_t arm_ni_identifier_show(struct device *dev, 230 struct device_attribute *attr, char *buf) 231 { 232 struct arm_ni *ni = cd_to_ni(pmu_to_cd(dev_get_drvdata(dev))); 233 u32 reg = readl_relaxed(ni->base + NI_PERIPHERAL_ID2); 234 int version = FIELD_GET(NI_PIDR2_VERSION, reg); 235 236 return sysfs_emit(buf, "%03x%02x\n", ni->part, version); 237 } 238 239 static struct device_attribute arm_ni_identifier_attr = 240 __ATTR(identifier, 0444, arm_ni_identifier_show, NULL); 241 242 static struct attribute *arm_ni_other_attrs[] = { 243 &arm_ni_cpumask_attr.attr, 244 &arm_ni_identifier_attr.attr, 245 NULL 246 }; 247 248 static const struct attribute_group arm_ni_other_attr_group = { 249 .attrs = arm_ni_other_attrs, 250 }; 251 252 static const struct attribute_group *arm_ni_attr_groups[] = { 253 &arm_ni_event_attrs_group, 254 &arm_ni_format_attrs_group, 255 &arm_ni_other_attr_group, 256 NULL 257 }; 258 259 static void arm_ni_pmu_enable(struct pmu *pmu) 260 { 261 writel_relaxed(NI_PMCR_ENABLE, pmu_to_cd(pmu)->pmu_base + NI_PMCR); 262 } 263 264 static void arm_ni_pmu_disable(struct pmu *pmu) 265 { 266 writel_relaxed(0, pmu_to_cd(pmu)->pmu_base + NI_PMCR); 267 } 268 269 struct arm_ni_val { 270 unsigned int evcnt; 271 unsigned int ccnt; 272 }; 273 274 static bool arm_ni_val_count_event(struct perf_event *evt, struct arm_ni_val *val) 275 { 276 if (is_software_event(evt)) 277 return true; 278 279 if (NI_EVENT_TYPE(evt) == NI_PMU) { 280 val->ccnt++; 281 return val->ccnt <= 1; 282 } 283 284 val->evcnt++; 285 return val->evcnt <= NI_NUM_COUNTERS; 286 } 287 288 static int arm_ni_validate_group(struct perf_event *event) 289 { 290 struct perf_event *sibling, *leader = event->group_leader; 291 struct arm_ni_val val = { 0 }; 292 293 if (leader == event) 294 return 0; 295 296 arm_ni_val_count_event(event, &val); 297 if (!arm_ni_val_count_event(leader, &val)) 298 return -EINVAL; 299 300 for_each_sibling_event(sibling, leader) { 301 if (!arm_ni_val_count_event(sibling, &val)) 302 return -EINVAL; 303 } 304 return 0; 305 } 306 307 static int arm_ni_event_init(struct perf_event *event) 308 { 309 struct arm_ni_cd *cd = pmu_to_cd(event->pmu); 310 311 if (event->attr.type != event->pmu->type) 312 return -ENOENT; 313 314 if (is_sampling_event(event)) 315 return -EINVAL; 316 317 event->cpu = cd->cpu; 318 if (NI_EVENT_TYPE(event) == NI_PMU) 319 return arm_ni_validate_group(event); 320 321 cd_for_each_unit(cd, unit) { 322 if (unit->type == NI_EVENT_TYPE(event) && 323 unit->id == NI_EVENT_NODEID(event) && unit->ns) { 324 event->hw.config_base = (unsigned long)unit; 325 return arm_ni_validate_group(event); 326 } 327 } 328 return -EINVAL; 329 } 330 331 static u64 arm_ni_read_ccnt(struct arm_ni_cd *cd) 332 { 333 u64 l, u_old, u_new; 334 int retries = 3; /* 1st time unlucky, 2nd improbable, 3rd just broken */ 335 336 u_new = readl_relaxed(cd->pmu_base + NI_PMCCNTR_U); 337 do { 338 u_old = u_new; 339 l = readl_relaxed(cd->pmu_base + NI_PMCCNTR_L); 340 u_new = readl_relaxed(cd->pmu_base + NI_PMCCNTR_U); 341 } while (u_new != u_old && --retries); 342 WARN_ON(!retries); 343 344 return (u_new << 32) | l; 345 } 346 347 static void arm_ni_event_read(struct perf_event *event) 348 { 349 struct arm_ni_cd *cd = pmu_to_cd(event->pmu); 350 struct hw_perf_event *hw = &event->hw; 351 u64 count, prev; 352 bool ccnt = hw->idx == NI_CCNT_IDX; 353 354 do { 355 prev = local64_read(&hw->prev_count); 356 if (ccnt) 357 count = arm_ni_read_ccnt(cd); 358 else 359 count = readl_relaxed(cd->pmu_base + NI_PMEVCNTR(hw->idx)); 360 } while (local64_cmpxchg(&hw->prev_count, prev, count) != prev); 361 362 count -= prev; 363 if (!ccnt) 364 count = (u32)count; 365 local64_add(count, &event->count); 366 } 367 368 static void arm_ni_event_start(struct perf_event *event, int flags) 369 { 370 struct arm_ni_cd *cd = pmu_to_cd(event->pmu); 371 372 writel_relaxed(1U << event->hw.idx, cd->pmu_base + NI_PMCNTENSET); 373 } 374 375 static void arm_ni_event_stop(struct perf_event *event, int flags) 376 { 377 struct arm_ni_cd *cd = pmu_to_cd(event->pmu); 378 379 writel_relaxed(1U << event->hw.idx, cd->pmu_base + NI_PMCNTENCLR); 380 if (flags & PERF_EF_UPDATE) 381 arm_ni_event_read(event); 382 } 383 384 static void arm_ni_init_ccnt(struct arm_ni_cd *cd) 385 { 386 local64_set(&cd->ccnt->hw.prev_count, S64_MIN); 387 lo_hi_writeq_relaxed(S64_MIN, cd->pmu_base + NI_PMCCNTR_L); 388 } 389 390 static void arm_ni_init_evcnt(struct arm_ni_cd *cd, int idx) 391 { 392 local64_set(&cd->evcnt[idx]->hw.prev_count, S32_MIN); 393 writel_relaxed(S32_MIN, cd->pmu_base + NI_PMEVCNTR(idx)); 394 } 395 396 static int arm_ni_event_add(struct perf_event *event, int flags) 397 { 398 struct arm_ni_cd *cd = pmu_to_cd(event->pmu); 399 struct hw_perf_event *hw = &event->hw; 400 struct arm_ni_unit *unit; 401 enum ni_node_type type = NI_EVENT_TYPE(event); 402 u32 reg; 403 404 if (type == NI_PMU) { 405 if (cd->ccnt) 406 return -ENOSPC; 407 hw->idx = NI_CCNT_IDX; 408 cd->ccnt = event; 409 arm_ni_init_ccnt(cd); 410 } else { 411 hw->idx = 0; 412 while (cd->evcnt[hw->idx]) { 413 if (++hw->idx == NI_NUM_COUNTERS) 414 return -ENOSPC; 415 } 416 cd->evcnt[hw->idx] = event; 417 unit = (void *)hw->config_base; 418 unit->event[hw->idx] = NI_EVENT_EVENTID(event); 419 arm_ni_init_evcnt(cd, hw->idx); 420 lo_hi_writeq_relaxed(le64_to_cpu(unit->pmusel), unit->pmusela); 421 422 reg = FIELD_PREP(NI_PMEVTYPER_NODE_TYPE, type) | 423 FIELD_PREP(NI_PMEVTYPER_NODE_ID, NI_EVENT_NODEID(event)); 424 writel_relaxed(reg, cd->pmu_base + NI_PMEVTYPER(hw->idx)); 425 } 426 if (flags & PERF_EF_START) 427 arm_ni_event_start(event, 0); 428 return 0; 429 } 430 431 static void arm_ni_event_del(struct perf_event *event, int flags) 432 { 433 struct arm_ni_cd *cd = pmu_to_cd(event->pmu); 434 struct hw_perf_event *hw = &event->hw; 435 436 arm_ni_event_stop(event, PERF_EF_UPDATE); 437 438 if (hw->idx == NI_CCNT_IDX) 439 cd->ccnt = NULL; 440 else 441 cd->evcnt[hw->idx] = NULL; 442 } 443 444 static irqreturn_t arm_ni_handle_irq(int irq, void *dev_id) 445 { 446 struct arm_ni_cd *cd = dev_id; 447 irqreturn_t ret = IRQ_NONE; 448 u32 reg = readl_relaxed(cd->pmu_base + NI_PMOVSCLR); 449 450 if (reg & (1U << NI_CCNT_IDX)) { 451 ret = IRQ_HANDLED; 452 if (!(WARN_ON(!cd->ccnt))) { 453 arm_ni_event_read(cd->ccnt); 454 arm_ni_init_ccnt(cd); 455 } 456 } 457 for (int i = 0; i < NI_NUM_COUNTERS; i++) { 458 if (!(reg & (1U << i))) 459 continue; 460 ret = IRQ_HANDLED; 461 if (!(WARN_ON(!cd->evcnt[i]))) { 462 arm_ni_event_read(cd->evcnt[i]); 463 arm_ni_init_evcnt(cd, i); 464 } 465 } 466 writel_relaxed(reg, cd->pmu_base + NI_PMOVSCLR); 467 return ret; 468 } 469 470 static int arm_ni_init_cd(struct arm_ni *ni, struct arm_ni_node *node, u64 res_start) 471 { 472 struct arm_ni_cd *cd = ni->cds + node->id; 473 const char *name; 474 int err; 475 476 cd->id = node->id; 477 cd->num_units = node->num_components; 478 cd->units = devm_kcalloc(ni->dev, cd->num_units, sizeof(*(cd->units)), GFP_KERNEL); 479 if (!cd->units) 480 return -ENOMEM; 481 482 for (int i = 0; i < cd->num_units; i++) { 483 u32 reg = readl_relaxed(node->base + NI_CHILD_PTR(i)); 484 void __iomem *unit_base = ni->base + reg; 485 struct arm_ni_unit *unit = cd->units + i; 486 487 reg = readl_relaxed(unit_base + NI_NODE_TYPE); 488 unit->type = FIELD_GET(NI_NODE_TYPE_NODE_TYPE, reg); 489 unit->id = FIELD_GET(NI_NODE_TYPE_NODE_ID, reg); 490 491 switch (unit->type) { 492 case NI_PMU: 493 reg = readl_relaxed(unit_base + NI_PMCFGR); 494 if (!reg) { 495 dev_info(ni->dev, "No access to PMU %d\n", cd->id); 496 devm_kfree(ni->dev, cd->units); 497 return 0; 498 } 499 unit->ns = true; 500 cd->pmu_base = unit_base; 501 break; 502 case NI_ASNI: 503 case NI_AMNI: 504 case NI_HSNI: 505 case NI_HMNI: 506 case NI_PMNI: 507 unit->pmusela = unit_base + NI700_PMUSELA; 508 writel_relaxed(1, unit->pmusela); 509 if (readl_relaxed(unit->pmusela) != 1) 510 dev_info(ni->dev, "No access to node 0x%04x%04x\n", unit->id, unit->type); 511 else 512 unit->ns = true; 513 break; 514 default: 515 /* 516 * e.g. FMU - thankfully bits 3:2 of FMU_ERR_FR0 are RES0 so 517 * can't alias any of the leaf node types we're looking for. 518 */ 519 dev_dbg(ni->dev, "Mystery node 0x%04x%04x\n", unit->id, unit->type); 520 break; 521 } 522 } 523 524 res_start += cd->pmu_base - ni->base; 525 if (!devm_request_mem_region(ni->dev, res_start, SZ_4K, dev_name(ni->dev))) { 526 dev_err(ni->dev, "Failed to request PMU region 0x%llx\n", res_start); 527 return -EBUSY; 528 } 529 530 writel_relaxed(NI_PMCR_RESET_CCNT | NI_PMCR_RESET_EVCNT, 531 cd->pmu_base + NI_PMCR); 532 writel_relaxed(U32_MAX, cd->pmu_base + NI_PMCNTENCLR); 533 writel_relaxed(U32_MAX, cd->pmu_base + NI_PMOVSCLR); 534 writel_relaxed(U32_MAX, cd->pmu_base + NI_PMINTENSET); 535 536 cd->irq = platform_get_irq(to_platform_device(ni->dev), cd->id); 537 if (cd->irq < 0) 538 return cd->irq; 539 540 err = devm_request_irq(ni->dev, cd->irq, arm_ni_handle_irq, 541 IRQF_NOBALANCING | IRQF_NO_THREAD, 542 dev_name(ni->dev), cd); 543 if (err) 544 return err; 545 546 cd->cpu = cpumask_local_spread(0, dev_to_node(ni->dev)); 547 cd->pmu = (struct pmu) { 548 .module = THIS_MODULE, 549 .parent = ni->dev, 550 .attr_groups = arm_ni_attr_groups, 551 .capabilities = PERF_PMU_CAP_NO_EXCLUDE, 552 .task_ctx_nr = perf_invalid_context, 553 .pmu_enable = arm_ni_pmu_enable, 554 .pmu_disable = arm_ni_pmu_disable, 555 .event_init = arm_ni_event_init, 556 .add = arm_ni_event_add, 557 .del = arm_ni_event_del, 558 .start = arm_ni_event_start, 559 .stop = arm_ni_event_stop, 560 .read = arm_ni_event_read, 561 }; 562 563 name = devm_kasprintf(ni->dev, GFP_KERNEL, "arm_ni_%d_cd_%d", ni->id, cd->id); 564 if (!name) 565 return -ENOMEM; 566 567 err = cpuhp_state_add_instance_nocalls(arm_ni_hp_state, &cd->cpuhp_node); 568 if (err) 569 return err; 570 571 err = perf_pmu_register(&cd->pmu, name, -1); 572 if (err) 573 cpuhp_state_remove_instance_nocalls(arm_ni_hp_state, &cd->cpuhp_node); 574 575 return err; 576 } 577 578 static void arm_ni_probe_domain(void __iomem *base, struct arm_ni_node *node) 579 { 580 u32 reg = readl_relaxed(base + NI_NODE_TYPE); 581 582 node->base = base; 583 node->type = FIELD_GET(NI_NODE_TYPE_NODE_TYPE, reg); 584 node->id = FIELD_GET(NI_NODE_TYPE_NODE_ID, reg); 585 node->num_components = readl_relaxed(base + NI_CHILD_NODE_INFO); 586 } 587 588 static int arm_ni_probe(struct platform_device *pdev) 589 { 590 struct arm_ni_node cfg, vd, pd, cd; 591 struct arm_ni *ni; 592 struct resource *res; 593 void __iomem *base; 594 static atomic_t id; 595 int num_cds; 596 u32 reg, part; 597 598 /* 599 * We want to map the whole configuration space for ease of discovery, 600 * but the PMU pages are the only ones for which we can honestly claim 601 * exclusive ownership, so we'll request them explicitly once found. 602 */ 603 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 604 base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); 605 if (!base) 606 return -ENOMEM; 607 608 arm_ni_probe_domain(base, &cfg); 609 if (cfg.type != NI_GLOBAL) 610 return -ENODEV; 611 612 reg = readl_relaxed(cfg.base + NI_PERIPHERAL_ID0); 613 part = FIELD_GET(NI_PIDR0_PART_7_0, reg); 614 reg = readl_relaxed(cfg.base + NI_PERIPHERAL_ID1); 615 part |= FIELD_GET(NI_PIDR1_PART_11_8, reg) << 8; 616 617 switch (part) { 618 case PART_NI_700: 619 case PART_NI_710AE: 620 break; 621 default: 622 dev_WARN(&pdev->dev, "Unknown part number: 0x%03x, this may go badly\n", part); 623 break; 624 } 625 626 num_cds = 0; 627 for (int v = 0; v < cfg.num_components; v++) { 628 reg = readl_relaxed(cfg.base + NI_CHILD_PTR(v)); 629 arm_ni_probe_domain(base + reg, &vd); 630 for (int p = 0; p < vd.num_components; p++) { 631 reg = readl_relaxed(vd.base + NI_CHILD_PTR(p)); 632 arm_ni_probe_domain(base + reg, &pd); 633 num_cds += pd.num_components; 634 } 635 } 636 637 ni = devm_kzalloc(&pdev->dev, struct_size(ni, cds, num_cds), GFP_KERNEL); 638 if (!ni) 639 return -ENOMEM; 640 641 ni->dev = &pdev->dev; 642 ni->base = base; 643 ni->num_cds = num_cds; 644 ni->part = part; 645 ni->id = atomic_fetch_inc(&id); 646 647 for (int v = 0; v < cfg.num_components; v++) { 648 reg = readl_relaxed(cfg.base + NI_CHILD_PTR(v)); 649 arm_ni_probe_domain(base + reg, &vd); 650 for (int p = 0; p < vd.num_components; p++) { 651 reg = readl_relaxed(vd.base + NI_CHILD_PTR(p)); 652 arm_ni_probe_domain(base + reg, &pd); 653 for (int c = 0; c < pd.num_components; c++) { 654 int ret; 655 656 reg = readl_relaxed(pd.base + NI_CHILD_PTR(c)); 657 arm_ni_probe_domain(base + reg, &cd); 658 ret = arm_ni_init_cd(ni, &cd, res->start); 659 if (ret) 660 return ret; 661 } 662 } 663 } 664 665 return 0; 666 } 667 668 static void arm_ni_remove(struct platform_device *pdev) 669 { 670 struct arm_ni *ni = platform_get_drvdata(pdev); 671 672 for (int i = 0; i < ni->num_cds; i++) { 673 struct arm_ni_cd *cd = ni->cds + i; 674 675 if (!cd->pmu_base) 676 continue; 677 678 writel_relaxed(0, cd->pmu_base + NI_PMCR); 679 writel_relaxed(U32_MAX, cd->pmu_base + NI_PMINTENCLR); 680 perf_pmu_unregister(&cd->pmu); 681 cpuhp_state_remove_instance_nocalls(arm_ni_hp_state, &cd->cpuhp_node); 682 } 683 } 684 685 #ifdef CONFIG_OF 686 static const struct of_device_id arm_ni_of_match[] = { 687 { .compatible = "arm,ni-700" }, 688 {} 689 }; 690 MODULE_DEVICE_TABLE(of, arm_ni_of_match); 691 #endif 692 693 #ifdef CONFIG_ACPI 694 static const struct acpi_device_id arm_ni_acpi_match[] = { 695 { "ARMHCB70" }, 696 {} 697 }; 698 MODULE_DEVICE_TABLE(acpi, arm_ni_acpi_match); 699 #endif 700 701 static struct platform_driver arm_ni_driver = { 702 .driver = { 703 .name = "arm-ni", 704 .of_match_table = of_match_ptr(arm_ni_of_match), 705 .acpi_match_table = ACPI_PTR(arm_ni_acpi_match), 706 }, 707 .probe = arm_ni_probe, 708 .remove = arm_ni_remove, 709 }; 710 711 static void arm_ni_pmu_migrate(struct arm_ni_cd *cd, unsigned int cpu) 712 { 713 perf_pmu_migrate_context(&cd->pmu, cd->cpu, cpu); 714 irq_set_affinity(cd->irq, cpumask_of(cpu)); 715 cd->cpu = cpu; 716 } 717 718 static int arm_ni_pmu_online_cpu(unsigned int cpu, struct hlist_node *cpuhp_node) 719 { 720 struct arm_ni_cd *cd; 721 int node; 722 723 cd = hlist_entry_safe(cpuhp_node, struct arm_ni_cd, cpuhp_node); 724 node = dev_to_node(cd_to_ni(cd)->dev); 725 if (cpu_to_node(cd->cpu) != node && cpu_to_node(cpu) == node) 726 arm_ni_pmu_migrate(cd, cpu); 727 return 0; 728 } 729 730 static int arm_ni_pmu_offline_cpu(unsigned int cpu, struct hlist_node *cpuhp_node) 731 { 732 struct arm_ni_cd *cd; 733 unsigned int target; 734 int node; 735 736 cd = hlist_entry_safe(cpuhp_node, struct arm_ni_cd, cpuhp_node); 737 if (cpu != cd->cpu) 738 return 0; 739 740 node = dev_to_node(cd_to_ni(cd)->dev); 741 target = cpumask_any_and_but(cpumask_of_node(node), cpu_online_mask, cpu); 742 if (target >= nr_cpu_ids) 743 target = cpumask_any_but(cpu_online_mask, cpu); 744 745 if (target < nr_cpu_ids) 746 arm_ni_pmu_migrate(cd, target); 747 return 0; 748 } 749 750 static int __init arm_ni_init(void) 751 { 752 int ret; 753 754 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, 755 "perf/arm/ni:online", 756 arm_ni_pmu_online_cpu, 757 arm_ni_pmu_offline_cpu); 758 if (ret < 0) 759 return ret; 760 761 arm_ni_hp_state = ret; 762 763 ret = platform_driver_register(&arm_ni_driver); 764 if (ret) 765 cpuhp_remove_multi_state(arm_ni_hp_state); 766 return ret; 767 } 768 769 static void __exit arm_ni_exit(void) 770 { 771 platform_driver_unregister(&arm_ni_driver); 772 cpuhp_remove_multi_state(arm_ni_hp_state); 773 } 774 775 module_init(arm_ni_init); 776 module_exit(arm_ni_exit); 777 778 MODULE_AUTHOR("Robin Murphy <robin.murphy@arm.com>"); 779 MODULE_DESCRIPTION("Arm NI-700 PMU driver"); 780 MODULE_LICENSE("GPL v2"); 781