1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * This driver adds support for perf events to use the Performance 5 * Monitor Counter Groups (PMCG) associated with an SMMUv3 node 6 * to monitor that node. 7 * 8 * SMMUv3 PMCG devices are named as smmuv3_pmcg_<phys_addr_page> where 9 * <phys_addr_page> is the physical page address of the SMMU PMCG wrapped 10 * to 4K boundary. For example, the PMCG at 0xff88840000 is named 11 * smmuv3_pmcg_ff88840 12 * 13 * Filtering by stream id is done by specifying filtering parameters 14 * with the event. options are: 15 * filter_enable - 0 = no filtering, 1 = filtering enabled 16 * filter_span - 0 = exact match, 1 = pattern match 17 * filter_stream_id - pattern to filter against 18 * 19 * To match a partial StreamID where the X most-significant bits must match 20 * but the Y least-significant bits might differ, STREAMID is programmed 21 * with a value that contains: 22 * STREAMID[Y - 1] == 0. 23 * STREAMID[Y - 2:0] == 1 (where Y > 1). 24 * The remainder of implemented bits of STREAMID (X bits, from bit Y upwards) 25 * contain a value to match from the corresponding bits of event StreamID. 26 * 27 * Example: perf stat -e smmuv3_pmcg_ff88840/transaction,filter_enable=1, 28 * filter_span=1,filter_stream_id=0x42/ -a netperf 29 * Applies filter pattern 0x42 to transaction events, which means events 30 * matching stream ids 0x42 and 0x43 are counted. Further filtering 31 * information is available in the SMMU documentation. 32 * 33 * SMMU events are not attributable to a CPU, so task mode and sampling 34 * are not supported. 35 */ 36 37 #include <linux/acpi.h> 38 #include <linux/acpi_iort.h> 39 #include <linux/bitfield.h> 40 #include <linux/bitops.h> 41 #include <linux/cpuhotplug.h> 42 #include <linux/cpumask.h> 43 #include <linux/device.h> 44 #include <linux/errno.h> 45 #include <linux/interrupt.h> 46 #include <linux/irq.h> 47 #include <linux/kernel.h> 48 #include <linux/list.h> 49 #include <linux/msi.h> 50 #include <linux/of.h> 51 #include <linux/perf_event.h> 52 #include <linux/platform_device.h> 53 #include <linux/smp.h> 54 #include <linux/sysfs.h> 55 #include <linux/types.h> 56 57 #define SMMU_PMCG_EVCNTR0 0x0 58 #define SMMU_PMCG_EVCNTR(n, stride) (SMMU_PMCG_EVCNTR0 + (n) * (stride)) 59 #define SMMU_PMCG_EVTYPER0 0x400 60 #define SMMU_PMCG_EVTYPER(n) (SMMU_PMCG_EVTYPER0 + (n) * 4) 61 #define SMMU_PMCG_SID_SPAN_SHIFT 29 62 #define SMMU_PMCG_SMR0 0xA00 63 #define SMMU_PMCG_SMR(n) (SMMU_PMCG_SMR0 + (n) * 4) 64 #define SMMU_PMCG_CNTENSET0 0xC00 65 #define SMMU_PMCG_CNTENCLR0 0xC20 66 #define SMMU_PMCG_INTENSET0 0xC40 67 #define SMMU_PMCG_INTENCLR0 0xC60 68 #define SMMU_PMCG_OVSCLR0 0xC80 69 #define SMMU_PMCG_OVSSET0 0xCC0 70 #define SMMU_PMCG_CFGR 0xE00 71 #define SMMU_PMCG_CFGR_SID_FILTER_TYPE BIT(23) 72 #define SMMU_PMCG_CFGR_MSI BIT(21) 73 #define SMMU_PMCG_CFGR_RELOC_CTRS BIT(20) 74 #define SMMU_PMCG_CFGR_SIZE GENMASK(13, 8) 75 #define SMMU_PMCG_CFGR_NCTR GENMASK(5, 0) 76 #define SMMU_PMCG_CR 0xE04 77 #define SMMU_PMCG_CR_ENABLE BIT(0) 78 #define SMMU_PMCG_IIDR 0xE08 79 #define SMMU_PMCG_IIDR_PRODUCTID GENMASK(31, 20) 80 #define SMMU_PMCG_IIDR_VARIANT GENMASK(19, 16) 81 #define SMMU_PMCG_IIDR_REVISION GENMASK(15, 12) 82 #define SMMU_PMCG_IIDR_IMPLEMENTER GENMASK(11, 0) 83 #define SMMU_PMCG_CEID0 0xE20 84 #define SMMU_PMCG_CEID1 0xE28 85 #define SMMU_PMCG_IRQ_CTRL 0xE50 86 #define SMMU_PMCG_IRQ_CTRL_IRQEN BIT(0) 87 #define SMMU_PMCG_IRQ_CFG0 0xE58 88 #define SMMU_PMCG_IRQ_CFG1 0xE60 89 #define SMMU_PMCG_IRQ_CFG2 0xE64 90 91 /* IMP-DEF ID registers */ 92 #define SMMU_PMCG_PIDR0 0xFE0 93 #define SMMU_PMCG_PIDR0_PART_0 GENMASK(7, 0) 94 #define SMMU_PMCG_PIDR1 0xFE4 95 #define SMMU_PMCG_PIDR1_DES_0 GENMASK(7, 4) 96 #define SMMU_PMCG_PIDR1_PART_1 GENMASK(3, 0) 97 #define SMMU_PMCG_PIDR2 0xFE8 98 #define SMMU_PMCG_PIDR2_REVISION GENMASK(7, 4) 99 #define SMMU_PMCG_PIDR2_DES_1 GENMASK(2, 0) 100 #define SMMU_PMCG_PIDR3 0xFEC 101 #define SMMU_PMCG_PIDR3_REVAND GENMASK(7, 4) 102 #define SMMU_PMCG_PIDR4 0xFD0 103 #define SMMU_PMCG_PIDR4_DES_2 GENMASK(3, 0) 104 105 /* MSI config fields */ 106 #define MSI_CFG0_ADDR_MASK GENMASK_ULL(51, 2) 107 #define MSI_CFG2_MEMATTR_DEVICE_nGnRE 0x1 108 109 #define SMMU_PMCG_DEFAULT_FILTER_SPAN 1 110 #define SMMU_PMCG_DEFAULT_FILTER_SID GENMASK(31, 0) 111 112 #define SMMU_PMCG_MAX_COUNTERS 64 113 #define SMMU_PMCG_ARCH_MAX_EVENTS 128 114 115 #define SMMU_PMCG_PA_SHIFT 12 116 117 #define SMMU_PMCG_EVCNTR_RDONLY BIT(0) 118 #define SMMU_PMCG_HARDEN_DISABLE BIT(1) 119 120 static int cpuhp_state_num; 121 122 struct smmu_pmu { 123 struct hlist_node node; 124 struct perf_event *events[SMMU_PMCG_MAX_COUNTERS]; 125 DECLARE_BITMAP(used_counters, SMMU_PMCG_MAX_COUNTERS); 126 DECLARE_BITMAP(supported_events, SMMU_PMCG_ARCH_MAX_EVENTS); 127 unsigned int irq; 128 unsigned int on_cpu; 129 struct pmu pmu; 130 unsigned int num_counters; 131 struct device *dev; 132 void __iomem *reg_base; 133 void __iomem *reloc_base; 134 u64 counter_mask; 135 u32 options; 136 u32 iidr; 137 bool global_filter; 138 }; 139 140 #define to_smmu_pmu(p) (container_of(p, struct smmu_pmu, pmu)) 141 142 #define SMMU_PMU_EVENT_ATTR_EXTRACTOR(_name, _config, _start, _end) \ 143 static inline u32 get_##_name(struct perf_event *event) \ 144 { \ 145 return FIELD_GET(GENMASK_ULL(_end, _start), \ 146 event->attr._config); \ 147 } \ 148 149 SMMU_PMU_EVENT_ATTR_EXTRACTOR(event, config, 0, 15); 150 SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_stream_id, config1, 0, 31); 151 SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_span, config1, 32, 32); 152 SMMU_PMU_EVENT_ATTR_EXTRACTOR(filter_enable, config1, 33, 33); 153 154 static inline void smmu_pmu_enable(struct pmu *pmu) 155 { 156 struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu); 157 158 writel(SMMU_PMCG_IRQ_CTRL_IRQEN, 159 smmu_pmu->reg_base + SMMU_PMCG_IRQ_CTRL); 160 writel(SMMU_PMCG_CR_ENABLE, smmu_pmu->reg_base + SMMU_PMCG_CR); 161 } 162 163 static int smmu_pmu_apply_event_filter(struct smmu_pmu *smmu_pmu, 164 struct perf_event *event, int idx); 165 166 static inline void smmu_pmu_enable_quirk_hip08_09(struct pmu *pmu) 167 { 168 struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu); 169 unsigned int idx; 170 171 for_each_set_bit(idx, smmu_pmu->used_counters, smmu_pmu->num_counters) 172 smmu_pmu_apply_event_filter(smmu_pmu, smmu_pmu->events[idx], idx); 173 174 smmu_pmu_enable(pmu); 175 } 176 177 static inline void smmu_pmu_disable(struct pmu *pmu) 178 { 179 struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu); 180 181 writel(0, smmu_pmu->reg_base + SMMU_PMCG_CR); 182 writel(0, smmu_pmu->reg_base + SMMU_PMCG_IRQ_CTRL); 183 } 184 185 static inline void smmu_pmu_disable_quirk_hip08_09(struct pmu *pmu) 186 { 187 struct smmu_pmu *smmu_pmu = to_smmu_pmu(pmu); 188 unsigned int idx; 189 190 /* 191 * The global disable of PMU sometimes fail to stop the counting. 192 * Harden this by writing an invalid event type to each used counter 193 * to forcibly stop counting. 194 */ 195 for_each_set_bit(idx, smmu_pmu->used_counters, smmu_pmu->num_counters) 196 writel(0xffff, smmu_pmu->reg_base + SMMU_PMCG_EVTYPER(idx)); 197 198 smmu_pmu_disable(pmu); 199 } 200 201 static inline void smmu_pmu_counter_set_value(struct smmu_pmu *smmu_pmu, 202 u32 idx, u64 value) 203 { 204 if (smmu_pmu->counter_mask & BIT(32)) 205 writeq(value, smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 8)); 206 else 207 writel(value, smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 4)); 208 } 209 210 static inline u64 smmu_pmu_counter_get_value(struct smmu_pmu *smmu_pmu, u32 idx) 211 { 212 u64 value; 213 214 if (smmu_pmu->counter_mask & BIT(32)) 215 value = readq(smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 8)); 216 else 217 value = readl(smmu_pmu->reloc_base + SMMU_PMCG_EVCNTR(idx, 4)); 218 219 return value; 220 } 221 222 static inline void smmu_pmu_counter_enable(struct smmu_pmu *smmu_pmu, u32 idx) 223 { 224 writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_CNTENSET0); 225 } 226 227 static inline void smmu_pmu_counter_disable(struct smmu_pmu *smmu_pmu, u32 idx) 228 { 229 writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0); 230 } 231 232 static inline void smmu_pmu_interrupt_enable(struct smmu_pmu *smmu_pmu, u32 idx) 233 { 234 writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_INTENSET0); 235 } 236 237 static inline void smmu_pmu_interrupt_disable(struct smmu_pmu *smmu_pmu, 238 u32 idx) 239 { 240 writeq(BIT(idx), smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0); 241 } 242 243 static inline void smmu_pmu_set_evtyper(struct smmu_pmu *smmu_pmu, u32 idx, 244 u32 val) 245 { 246 writel(val, smmu_pmu->reg_base + SMMU_PMCG_EVTYPER(idx)); 247 } 248 249 static inline void smmu_pmu_set_smr(struct smmu_pmu *smmu_pmu, u32 idx, u32 val) 250 { 251 writel(val, smmu_pmu->reg_base + SMMU_PMCG_SMR(idx)); 252 } 253 254 static void smmu_pmu_event_update(struct perf_event *event) 255 { 256 struct hw_perf_event *hwc = &event->hw; 257 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 258 u64 delta, prev, now; 259 u32 idx = hwc->idx; 260 261 do { 262 prev = local64_read(&hwc->prev_count); 263 now = smmu_pmu_counter_get_value(smmu_pmu, idx); 264 } while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev); 265 266 /* handle overflow. */ 267 delta = now - prev; 268 delta &= smmu_pmu->counter_mask; 269 270 local64_add(delta, &event->count); 271 } 272 273 static void smmu_pmu_set_period(struct smmu_pmu *smmu_pmu, 274 struct hw_perf_event *hwc) 275 { 276 u32 idx = hwc->idx; 277 u64 new; 278 279 if (smmu_pmu->options & SMMU_PMCG_EVCNTR_RDONLY) { 280 /* 281 * On platforms that require this quirk, if the counter starts 282 * at < half_counter value and wraps, the current logic of 283 * handling the overflow may not work. It is expected that, 284 * those platforms will have full 64 counter bits implemented 285 * so that such a possibility is remote(eg: HiSilicon HIP08). 286 */ 287 new = smmu_pmu_counter_get_value(smmu_pmu, idx); 288 } else { 289 /* 290 * We limit the max period to half the max counter value 291 * of the counter size, so that even in the case of extreme 292 * interrupt latency the counter will (hopefully) not wrap 293 * past its initial value. 294 */ 295 new = smmu_pmu->counter_mask >> 1; 296 smmu_pmu_counter_set_value(smmu_pmu, idx, new); 297 } 298 299 local64_set(&hwc->prev_count, new); 300 } 301 302 static void smmu_pmu_set_event_filter(struct perf_event *event, 303 int idx, u32 span, u32 sid) 304 { 305 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 306 u32 evtyper; 307 308 evtyper = get_event(event) | span << SMMU_PMCG_SID_SPAN_SHIFT; 309 smmu_pmu_set_evtyper(smmu_pmu, idx, evtyper); 310 smmu_pmu_set_smr(smmu_pmu, idx, sid); 311 } 312 313 static bool smmu_pmu_check_global_filter(struct perf_event *curr, 314 struct perf_event *new) 315 { 316 if (get_filter_enable(new) != get_filter_enable(curr)) 317 return false; 318 319 if (!get_filter_enable(new)) 320 return true; 321 322 return get_filter_span(new) == get_filter_span(curr) && 323 get_filter_stream_id(new) == get_filter_stream_id(curr); 324 } 325 326 static int smmu_pmu_apply_event_filter(struct smmu_pmu *smmu_pmu, 327 struct perf_event *event, int idx) 328 { 329 u32 span, sid; 330 unsigned int cur_idx, num_ctrs = smmu_pmu->num_counters; 331 bool filter_en = !!get_filter_enable(event); 332 333 span = filter_en ? get_filter_span(event) : 334 SMMU_PMCG_DEFAULT_FILTER_SPAN; 335 sid = filter_en ? get_filter_stream_id(event) : 336 SMMU_PMCG_DEFAULT_FILTER_SID; 337 338 cur_idx = find_first_bit(smmu_pmu->used_counters, num_ctrs); 339 /* 340 * Per-counter filtering, or scheduling the first globally-filtered 341 * event into an empty PMU so idx == 0 and it works out equivalent. 342 */ 343 if (!smmu_pmu->global_filter || cur_idx == num_ctrs) { 344 smmu_pmu_set_event_filter(event, idx, span, sid); 345 return 0; 346 } 347 348 /* Otherwise, must match whatever's currently scheduled */ 349 if (smmu_pmu_check_global_filter(smmu_pmu->events[cur_idx], event)) { 350 smmu_pmu_set_evtyper(smmu_pmu, idx, get_event(event)); 351 return 0; 352 } 353 354 return -EAGAIN; 355 } 356 357 static int smmu_pmu_get_event_idx(struct smmu_pmu *smmu_pmu, 358 struct perf_event *event) 359 { 360 int idx, err; 361 unsigned int num_ctrs = smmu_pmu->num_counters; 362 363 idx = find_first_zero_bit(smmu_pmu->used_counters, num_ctrs); 364 if (idx == num_ctrs) 365 /* The counters are all in use. */ 366 return -EAGAIN; 367 368 err = smmu_pmu_apply_event_filter(smmu_pmu, event, idx); 369 if (err) 370 return err; 371 372 set_bit(idx, smmu_pmu->used_counters); 373 374 return idx; 375 } 376 377 static bool smmu_pmu_events_compatible(struct perf_event *curr, 378 struct perf_event *new) 379 { 380 if (new->pmu != curr->pmu) 381 return false; 382 383 if (to_smmu_pmu(new->pmu)->global_filter && 384 !smmu_pmu_check_global_filter(curr, new)) 385 return false; 386 387 return true; 388 } 389 390 /* 391 * Implementation of abstract pmu functionality required by 392 * the core perf events code. 393 */ 394 395 static int smmu_pmu_event_init(struct perf_event *event) 396 { 397 struct hw_perf_event *hwc = &event->hw; 398 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 399 struct device *dev = smmu_pmu->dev; 400 struct perf_event *sibling; 401 int group_num_events = 1; 402 u16 event_id; 403 404 if (event->attr.type != event->pmu->type) 405 return -ENOENT; 406 407 if (hwc->sample_period) { 408 dev_dbg(dev, "Sampling not supported\n"); 409 return -EOPNOTSUPP; 410 } 411 412 if (event->cpu < 0) { 413 dev_dbg(dev, "Per-task mode not supported\n"); 414 return -EOPNOTSUPP; 415 } 416 417 /* Verify specified event is supported on this PMU */ 418 event_id = get_event(event); 419 if (event_id < SMMU_PMCG_ARCH_MAX_EVENTS && 420 (!test_bit(event_id, smmu_pmu->supported_events))) { 421 dev_dbg(dev, "Invalid event %d for this PMU\n", event_id); 422 return -EINVAL; 423 } 424 425 /* Don't allow groups with mixed PMUs, except for s/w events */ 426 if (!is_software_event(event->group_leader)) { 427 if (!smmu_pmu_events_compatible(event->group_leader, event)) 428 return -EINVAL; 429 430 if (++group_num_events > smmu_pmu->num_counters) 431 return -EINVAL; 432 } 433 434 /* 435 * Ensure all events are on the same cpu so all events are in the 436 * same cpu context, to avoid races on pmu_enable etc. 437 */ 438 event->cpu = smmu_pmu->on_cpu; 439 440 hwc->idx = -1; 441 442 if (event->group_leader == event) 443 return 0; 444 445 for_each_sibling_event(sibling, event->group_leader) { 446 if (is_software_event(sibling)) 447 continue; 448 449 if (!smmu_pmu_events_compatible(sibling, event)) 450 return -EINVAL; 451 452 if (++group_num_events > smmu_pmu->num_counters) 453 return -EINVAL; 454 } 455 456 return 0; 457 } 458 459 static void smmu_pmu_event_start(struct perf_event *event, int flags) 460 { 461 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 462 struct hw_perf_event *hwc = &event->hw; 463 int idx = hwc->idx; 464 465 hwc->state = 0; 466 467 smmu_pmu_set_period(smmu_pmu, hwc); 468 469 smmu_pmu_counter_enable(smmu_pmu, idx); 470 } 471 472 static void smmu_pmu_event_stop(struct perf_event *event, int flags) 473 { 474 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 475 struct hw_perf_event *hwc = &event->hw; 476 int idx = hwc->idx; 477 478 if (hwc->state & PERF_HES_STOPPED) 479 return; 480 481 smmu_pmu_counter_disable(smmu_pmu, idx); 482 /* As the counter gets updated on _start, ignore PERF_EF_UPDATE */ 483 smmu_pmu_event_update(event); 484 hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; 485 } 486 487 static int smmu_pmu_event_add(struct perf_event *event, int flags) 488 { 489 struct hw_perf_event *hwc = &event->hw; 490 int idx; 491 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 492 493 idx = smmu_pmu_get_event_idx(smmu_pmu, event); 494 if (idx < 0) 495 return idx; 496 497 hwc->idx = idx; 498 hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; 499 smmu_pmu->events[idx] = event; 500 local64_set(&hwc->prev_count, 0); 501 502 smmu_pmu_interrupt_enable(smmu_pmu, idx); 503 504 if (flags & PERF_EF_START) 505 smmu_pmu_event_start(event, flags); 506 507 /* Propagate changes to the userspace mapping. */ 508 perf_event_update_userpage(event); 509 510 return 0; 511 } 512 513 static void smmu_pmu_event_del(struct perf_event *event, int flags) 514 { 515 struct hw_perf_event *hwc = &event->hw; 516 struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu); 517 int idx = hwc->idx; 518 519 smmu_pmu_event_stop(event, flags | PERF_EF_UPDATE); 520 smmu_pmu_interrupt_disable(smmu_pmu, idx); 521 smmu_pmu->events[idx] = NULL; 522 clear_bit(idx, smmu_pmu->used_counters); 523 524 perf_event_update_userpage(event); 525 } 526 527 static void smmu_pmu_event_read(struct perf_event *event) 528 { 529 smmu_pmu_event_update(event); 530 } 531 532 /* cpumask */ 533 534 static ssize_t smmu_pmu_cpumask_show(struct device *dev, 535 struct device_attribute *attr, 536 char *buf) 537 { 538 struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); 539 540 return cpumap_print_to_pagebuf(true, buf, cpumask_of(smmu_pmu->on_cpu)); 541 } 542 543 static struct device_attribute smmu_pmu_cpumask_attr = 544 __ATTR(cpumask, 0444, smmu_pmu_cpumask_show, NULL); 545 546 static struct attribute *smmu_pmu_cpumask_attrs[] = { 547 &smmu_pmu_cpumask_attr.attr, 548 NULL 549 }; 550 551 static const struct attribute_group smmu_pmu_cpumask_group = { 552 .attrs = smmu_pmu_cpumask_attrs, 553 }; 554 555 /* Events */ 556 557 static ssize_t smmu_pmu_event_show(struct device *dev, 558 struct device_attribute *attr, char *page) 559 { 560 struct perf_pmu_events_attr *pmu_attr; 561 562 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); 563 564 return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id); 565 } 566 567 #define SMMU_EVENT_ATTR(name, config) \ 568 PMU_EVENT_ATTR_ID(name, smmu_pmu_event_show, config) 569 570 static struct attribute *smmu_pmu_events[] = { 571 SMMU_EVENT_ATTR(cycles, 0), 572 SMMU_EVENT_ATTR(transaction, 1), 573 SMMU_EVENT_ATTR(tlb_miss, 2), 574 SMMU_EVENT_ATTR(config_cache_miss, 3), 575 SMMU_EVENT_ATTR(trans_table_walk_access, 4), 576 SMMU_EVENT_ATTR(config_struct_access, 5), 577 SMMU_EVENT_ATTR(pcie_ats_trans_rq, 6), 578 SMMU_EVENT_ATTR(pcie_ats_trans_passed, 7), 579 NULL 580 }; 581 582 static umode_t smmu_pmu_event_is_visible(struct kobject *kobj, 583 struct attribute *attr, int unused) 584 { 585 struct device *dev = kobj_to_dev(kobj); 586 struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); 587 struct perf_pmu_events_attr *pmu_attr; 588 589 pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr); 590 591 if (test_bit(pmu_attr->id, smmu_pmu->supported_events)) 592 return attr->mode; 593 594 return 0; 595 } 596 597 static const struct attribute_group smmu_pmu_events_group = { 598 .name = "events", 599 .attrs = smmu_pmu_events, 600 .is_visible = smmu_pmu_event_is_visible, 601 }; 602 603 static ssize_t smmu_pmu_identifier_attr_show(struct device *dev, 604 struct device_attribute *attr, 605 char *page) 606 { 607 struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); 608 609 return sysfs_emit(page, "0x%08x\n", smmu_pmu->iidr); 610 } 611 612 static umode_t smmu_pmu_identifier_attr_visible(struct kobject *kobj, 613 struct attribute *attr, 614 int n) 615 { 616 struct device *dev = kobj_to_dev(kobj); 617 struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev)); 618 619 if (!smmu_pmu->iidr) 620 return 0; 621 return attr->mode; 622 } 623 624 static struct device_attribute smmu_pmu_identifier_attr = 625 __ATTR(identifier, 0444, smmu_pmu_identifier_attr_show, NULL); 626 627 static struct attribute *smmu_pmu_identifier_attrs[] = { 628 &smmu_pmu_identifier_attr.attr, 629 NULL 630 }; 631 632 static const struct attribute_group smmu_pmu_identifier_group = { 633 .attrs = smmu_pmu_identifier_attrs, 634 .is_visible = smmu_pmu_identifier_attr_visible, 635 }; 636 637 /* Formats */ 638 PMU_FORMAT_ATTR(event, "config:0-15"); 639 PMU_FORMAT_ATTR(filter_stream_id, "config1:0-31"); 640 PMU_FORMAT_ATTR(filter_span, "config1:32"); 641 PMU_FORMAT_ATTR(filter_enable, "config1:33"); 642 643 static struct attribute *smmu_pmu_formats[] = { 644 &format_attr_event.attr, 645 &format_attr_filter_stream_id.attr, 646 &format_attr_filter_span.attr, 647 &format_attr_filter_enable.attr, 648 NULL 649 }; 650 651 static const struct attribute_group smmu_pmu_format_group = { 652 .name = "format", 653 .attrs = smmu_pmu_formats, 654 }; 655 656 static const struct attribute_group *smmu_pmu_attr_grps[] = { 657 &smmu_pmu_cpumask_group, 658 &smmu_pmu_events_group, 659 &smmu_pmu_format_group, 660 &smmu_pmu_identifier_group, 661 NULL 662 }; 663 664 /* 665 * Generic device handlers 666 */ 667 668 static int smmu_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) 669 { 670 struct smmu_pmu *smmu_pmu; 671 unsigned int target; 672 673 smmu_pmu = hlist_entry_safe(node, struct smmu_pmu, node); 674 if (cpu != smmu_pmu->on_cpu) 675 return 0; 676 677 target = cpumask_any_but(cpu_online_mask, cpu); 678 if (target >= nr_cpu_ids) 679 return 0; 680 681 perf_pmu_migrate_context(&smmu_pmu->pmu, cpu, target); 682 smmu_pmu->on_cpu = target; 683 WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(target))); 684 685 return 0; 686 } 687 688 static irqreturn_t smmu_pmu_handle_irq(int irq_num, void *data) 689 { 690 struct smmu_pmu *smmu_pmu = data; 691 DECLARE_BITMAP(ovs, BITS_PER_TYPE(u64)); 692 u64 ovsr; 693 unsigned int idx; 694 695 ovsr = readq(smmu_pmu->reloc_base + SMMU_PMCG_OVSSET0); 696 if (!ovsr) 697 return IRQ_NONE; 698 699 writeq(ovsr, smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0); 700 701 bitmap_from_u64(ovs, ovsr); 702 for_each_set_bit(idx, ovs, smmu_pmu->num_counters) { 703 struct perf_event *event = smmu_pmu->events[idx]; 704 struct hw_perf_event *hwc; 705 706 if (WARN_ON_ONCE(!event)) 707 continue; 708 709 smmu_pmu_event_update(event); 710 hwc = &event->hw; 711 712 smmu_pmu_set_period(smmu_pmu, hwc); 713 } 714 715 return IRQ_HANDLED; 716 } 717 718 static void smmu_pmu_free_msis(void *data) 719 { 720 struct device *dev = data; 721 722 platform_device_msi_free_irqs_all(dev); 723 } 724 725 static void smmu_pmu_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) 726 { 727 phys_addr_t doorbell; 728 struct device *dev = msi_desc_to_dev(desc); 729 struct smmu_pmu *pmu = dev_get_drvdata(dev); 730 731 doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo; 732 doorbell &= MSI_CFG0_ADDR_MASK; 733 734 writeq_relaxed(doorbell, pmu->reg_base + SMMU_PMCG_IRQ_CFG0); 735 writel_relaxed(msg->data, pmu->reg_base + SMMU_PMCG_IRQ_CFG1); 736 writel_relaxed(MSI_CFG2_MEMATTR_DEVICE_nGnRE, 737 pmu->reg_base + SMMU_PMCG_IRQ_CFG2); 738 } 739 740 static void smmu_pmu_setup_msi(struct smmu_pmu *pmu) 741 { 742 struct device *dev = pmu->dev; 743 int ret; 744 745 /* Clear MSI address reg */ 746 writeq_relaxed(0, pmu->reg_base + SMMU_PMCG_IRQ_CFG0); 747 748 /* MSI supported or not */ 749 if (!(readl(pmu->reg_base + SMMU_PMCG_CFGR) & SMMU_PMCG_CFGR_MSI)) 750 return; 751 752 ret = platform_device_msi_init_and_alloc_irqs(dev, 1, smmu_pmu_write_msi_msg); 753 if (ret) { 754 dev_warn(dev, "failed to allocate MSIs\n"); 755 return; 756 } 757 758 pmu->irq = msi_get_virq(dev, 0); 759 760 /* Add callback to free MSIs on teardown */ 761 devm_add_action(dev, smmu_pmu_free_msis, dev); 762 } 763 764 static int smmu_pmu_setup_irq(struct smmu_pmu *pmu) 765 { 766 unsigned long flags = IRQF_NOBALANCING | IRQF_SHARED | IRQF_NO_THREAD; 767 int irq, ret = -ENXIO; 768 769 smmu_pmu_setup_msi(pmu); 770 771 irq = pmu->irq; 772 if (irq) 773 ret = devm_request_irq(pmu->dev, irq, smmu_pmu_handle_irq, 774 flags, "smmuv3-pmu", pmu); 775 return ret; 776 } 777 778 static void smmu_pmu_reset(struct smmu_pmu *smmu_pmu) 779 { 780 u64 counter_present_mask = GENMASK_ULL(smmu_pmu->num_counters - 1, 0); 781 782 smmu_pmu_disable(&smmu_pmu->pmu); 783 784 /* Disable counter and interrupt */ 785 writeq_relaxed(counter_present_mask, 786 smmu_pmu->reg_base + SMMU_PMCG_CNTENCLR0); 787 writeq_relaxed(counter_present_mask, 788 smmu_pmu->reg_base + SMMU_PMCG_INTENCLR0); 789 writeq_relaxed(counter_present_mask, 790 smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0); 791 } 792 793 static void smmu_pmu_get_acpi_options(struct smmu_pmu *smmu_pmu) 794 { 795 u32 model; 796 797 model = *(u32 *)dev_get_platdata(smmu_pmu->dev); 798 799 switch (model) { 800 case IORT_SMMU_V3_PMCG_HISI_HIP08: 801 /* HiSilicon Erratum 162001800 */ 802 smmu_pmu->options |= SMMU_PMCG_EVCNTR_RDONLY | SMMU_PMCG_HARDEN_DISABLE; 803 break; 804 case IORT_SMMU_V3_PMCG_HISI_HIP09: 805 smmu_pmu->options |= SMMU_PMCG_HARDEN_DISABLE; 806 break; 807 } 808 809 dev_notice(smmu_pmu->dev, "option mask 0x%x\n", smmu_pmu->options); 810 } 811 812 static bool smmu_pmu_coresight_id_regs(struct smmu_pmu *smmu_pmu) 813 { 814 return of_device_is_compatible(smmu_pmu->dev->of_node, 815 "arm,mmu-600-pmcg"); 816 } 817 818 static void smmu_pmu_get_iidr(struct smmu_pmu *smmu_pmu) 819 { 820 u32 iidr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_IIDR); 821 822 if (!iidr && smmu_pmu_coresight_id_regs(smmu_pmu)) { 823 u32 pidr0 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR0); 824 u32 pidr1 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR1); 825 u32 pidr2 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR2); 826 u32 pidr3 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR3); 827 u32 pidr4 = readl(smmu_pmu->reg_base + SMMU_PMCG_PIDR4); 828 829 u32 productid = FIELD_GET(SMMU_PMCG_PIDR0_PART_0, pidr0) | 830 (FIELD_GET(SMMU_PMCG_PIDR1_PART_1, pidr1) << 8); 831 u32 variant = FIELD_GET(SMMU_PMCG_PIDR2_REVISION, pidr2); 832 u32 revision = FIELD_GET(SMMU_PMCG_PIDR3_REVAND, pidr3); 833 u32 implementer = 834 FIELD_GET(SMMU_PMCG_PIDR1_DES_0, pidr1) | 835 (FIELD_GET(SMMU_PMCG_PIDR2_DES_1, pidr2) << 4) | 836 (FIELD_GET(SMMU_PMCG_PIDR4_DES_2, pidr4) << 8); 837 838 iidr = FIELD_PREP(SMMU_PMCG_IIDR_PRODUCTID, productid) | 839 FIELD_PREP(SMMU_PMCG_IIDR_VARIANT, variant) | 840 FIELD_PREP(SMMU_PMCG_IIDR_REVISION, revision) | 841 FIELD_PREP(SMMU_PMCG_IIDR_IMPLEMENTER, implementer); 842 } 843 844 smmu_pmu->iidr = iidr; 845 } 846 847 static int smmu_pmu_probe(struct platform_device *pdev) 848 { 849 struct smmu_pmu *smmu_pmu; 850 struct resource *res_0; 851 u32 cfgr, reg_size; 852 u64 ceid_64[2]; 853 int irq, err; 854 char *name; 855 struct device *dev = &pdev->dev; 856 857 smmu_pmu = devm_kzalloc(dev, sizeof(*smmu_pmu), GFP_KERNEL); 858 if (!smmu_pmu) 859 return -ENOMEM; 860 861 smmu_pmu->dev = dev; 862 platform_set_drvdata(pdev, smmu_pmu); 863 864 smmu_pmu->pmu = (struct pmu) { 865 .module = THIS_MODULE, 866 .parent = &pdev->dev, 867 .task_ctx_nr = perf_invalid_context, 868 .pmu_enable = smmu_pmu_enable, 869 .pmu_disable = smmu_pmu_disable, 870 .event_init = smmu_pmu_event_init, 871 .add = smmu_pmu_event_add, 872 .del = smmu_pmu_event_del, 873 .start = smmu_pmu_event_start, 874 .stop = smmu_pmu_event_stop, 875 .read = smmu_pmu_event_read, 876 .attr_groups = smmu_pmu_attr_grps, 877 .capabilities = PERF_PMU_CAP_NO_EXCLUDE, 878 }; 879 880 smmu_pmu->reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res_0); 881 if (IS_ERR(smmu_pmu->reg_base)) 882 return PTR_ERR(smmu_pmu->reg_base); 883 884 cfgr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CFGR); 885 886 /* Determine if page 1 is present */ 887 if (cfgr & SMMU_PMCG_CFGR_RELOC_CTRS) { 888 smmu_pmu->reloc_base = devm_platform_ioremap_resource(pdev, 1); 889 if (IS_ERR(smmu_pmu->reloc_base)) 890 return PTR_ERR(smmu_pmu->reloc_base); 891 } else { 892 smmu_pmu->reloc_base = smmu_pmu->reg_base; 893 } 894 895 irq = platform_get_irq_optional(pdev, 0); 896 if (irq > 0) 897 smmu_pmu->irq = irq; 898 899 ceid_64[0] = readq_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CEID0); 900 ceid_64[1] = readq_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CEID1); 901 bitmap_from_arr32(smmu_pmu->supported_events, (u32 *)ceid_64, 902 SMMU_PMCG_ARCH_MAX_EVENTS); 903 904 smmu_pmu->num_counters = FIELD_GET(SMMU_PMCG_CFGR_NCTR, cfgr) + 1; 905 906 smmu_pmu->global_filter = !!(cfgr & SMMU_PMCG_CFGR_SID_FILTER_TYPE); 907 908 reg_size = FIELD_GET(SMMU_PMCG_CFGR_SIZE, cfgr); 909 smmu_pmu->counter_mask = GENMASK_ULL(reg_size, 0); 910 911 smmu_pmu_reset(smmu_pmu); 912 913 err = smmu_pmu_setup_irq(smmu_pmu); 914 if (err) { 915 dev_err(dev, "Setup irq failed, PMU @%pa\n", &res_0->start); 916 return err; 917 } 918 919 smmu_pmu_get_iidr(smmu_pmu); 920 921 name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "smmuv3_pmcg_%llx", 922 (res_0->start) >> SMMU_PMCG_PA_SHIFT); 923 if (!name) { 924 dev_err(dev, "Create name failed, PMU @%pa\n", &res_0->start); 925 return -EINVAL; 926 } 927 928 if (!dev->of_node) 929 smmu_pmu_get_acpi_options(smmu_pmu); 930 931 /* 932 * For platforms suffer this quirk, the PMU disable sometimes fails to 933 * stop the counters. This will leads to inaccurate or error counting. 934 * Forcibly disable the counters with these quirk handler. 935 */ 936 if (smmu_pmu->options & SMMU_PMCG_HARDEN_DISABLE) { 937 smmu_pmu->pmu.pmu_enable = smmu_pmu_enable_quirk_hip08_09; 938 smmu_pmu->pmu.pmu_disable = smmu_pmu_disable_quirk_hip08_09; 939 } 940 941 /* Pick one CPU to be the preferred one to use */ 942 smmu_pmu->on_cpu = raw_smp_processor_id(); 943 WARN_ON(irq_set_affinity(smmu_pmu->irq, cpumask_of(smmu_pmu->on_cpu))); 944 945 err = cpuhp_state_add_instance_nocalls(cpuhp_state_num, 946 &smmu_pmu->node); 947 if (err) { 948 dev_err(dev, "Error %d registering hotplug, PMU @%pa\n", 949 err, &res_0->start); 950 return err; 951 } 952 953 err = perf_pmu_register(&smmu_pmu->pmu, name, -1); 954 if (err) { 955 dev_err(dev, "Error %d registering PMU @%pa\n", 956 err, &res_0->start); 957 goto out_unregister; 958 } 959 960 dev_info(dev, "Registered PMU @ %pa using %d counters with %s filter settings\n", 961 &res_0->start, smmu_pmu->num_counters, 962 smmu_pmu->global_filter ? "Global(Counter0)" : 963 "Individual"); 964 965 return 0; 966 967 out_unregister: 968 cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); 969 return err; 970 } 971 972 static void smmu_pmu_remove(struct platform_device *pdev) 973 { 974 struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev); 975 976 perf_pmu_unregister(&smmu_pmu->pmu); 977 cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); 978 } 979 980 static void smmu_pmu_shutdown(struct platform_device *pdev) 981 { 982 struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev); 983 984 smmu_pmu_disable(&smmu_pmu->pmu); 985 } 986 987 #ifdef CONFIG_OF 988 static const struct of_device_id smmu_pmu_of_match[] = { 989 { .compatible = "arm,smmu-v3-pmcg" }, 990 {} 991 }; 992 MODULE_DEVICE_TABLE(of, smmu_pmu_of_match); 993 #endif 994 995 static struct platform_driver smmu_pmu_driver = { 996 .driver = { 997 .name = "arm-smmu-v3-pmcg", 998 .of_match_table = of_match_ptr(smmu_pmu_of_match), 999 .suppress_bind_attrs = true, 1000 }, 1001 .probe = smmu_pmu_probe, 1002 .remove = smmu_pmu_remove, 1003 .shutdown = smmu_pmu_shutdown, 1004 }; 1005 1006 static int __init arm_smmu_pmu_init(void) 1007 { 1008 int ret; 1009 1010 cpuhp_state_num = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, 1011 "perf/arm/pmcg:online", 1012 NULL, 1013 smmu_pmu_offline_cpu); 1014 if (cpuhp_state_num < 0) 1015 return cpuhp_state_num; 1016 1017 ret = platform_driver_register(&smmu_pmu_driver); 1018 if (ret) 1019 cpuhp_remove_multi_state(cpuhp_state_num); 1020 1021 return ret; 1022 } 1023 module_init(arm_smmu_pmu_init); 1024 1025 static void __exit arm_smmu_pmu_exit(void) 1026 { 1027 platform_driver_unregister(&smmu_pmu_driver); 1028 cpuhp_remove_multi_state(cpuhp_state_num); 1029 } 1030 1031 module_exit(arm_smmu_pmu_exit); 1032 1033 MODULE_ALIAS("platform:arm-smmu-v3-pmcg"); 1034 MODULE_DESCRIPTION("PMU driver for ARM SMMUv3 Performance Monitors Extension"); 1035 MODULE_AUTHOR("Neil Leeder <nleeder@codeaurora.org>"); 1036 MODULE_AUTHOR("Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>"); 1037 MODULE_LICENSE("GPL v2"); 1038