1 /* 2 * Copyright 2017 NXP 3 * Copyright 2011,2016 Freescale Semiconductor, Inc. 4 * Copyright 2011 Linaro Ltd. 5 * 6 * The code contained herein is licensed under the GNU General Public 7 * License. You may obtain a copy of the GNU General Public License 8 * Version 2 or later at the following locations: 9 * 10 * http://www.opensource.org/licenses/gpl-license.html 11 * http://www.gnu.org/copyleft/gpl.html 12 */ 13 14 #include <linux/hrtimer.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/of_address.h> 21 #include <linux/of_device.h> 22 #include <linux/perf_event.h> 23 #include <linux/slab.h> 24 25 #include "common.h" 26 27 #define MMDC_MAPSR 0x404 28 #define BP_MMDC_MAPSR_PSD 0 29 #define BP_MMDC_MAPSR_PSS 4 30 31 #define MMDC_MDMISC 0x18 32 #define BM_MMDC_MDMISC_DDR_TYPE 0x18 33 #define BP_MMDC_MDMISC_DDR_TYPE 0x3 34 35 #define TOTAL_CYCLES 0x0 36 #define BUSY_CYCLES 0x1 37 #define READ_ACCESSES 0x2 38 #define WRITE_ACCESSES 0x3 39 #define READ_BYTES 0x4 40 #define WRITE_BYTES 0x5 41 42 /* Enables, resets, freezes, overflow profiling*/ 43 #define DBG_DIS 0x0 44 #define DBG_EN 0x1 45 #define DBG_RST 0x2 46 #define PRF_FRZ 0x4 47 #define CYC_OVF 0x8 48 #define PROFILE_SEL 0x10 49 50 #define MMDC_MADPCR0 0x410 51 #define MMDC_MADPCR1 0x414 52 #define MMDC_MADPSR0 0x418 53 #define MMDC_MADPSR1 0x41C 54 #define MMDC_MADPSR2 0x420 55 #define MMDC_MADPSR3 0x424 56 #define MMDC_MADPSR4 0x428 57 #define MMDC_MADPSR5 0x42C 58 59 #define MMDC_NUM_COUNTERS 6 60 61 #define MMDC_FLAG_PROFILE_SEL 0x1 62 #define MMDC_PRF_AXI_ID_CLEAR 0x0 63 64 #define to_mmdc_pmu(p) container_of(p, struct mmdc_pmu, pmu) 65 66 static int ddr_type; 67 68 struct fsl_mmdc_devtype_data { 69 unsigned int flags; 70 }; 71 72 static const struct fsl_mmdc_devtype_data imx6q_data = { 73 }; 74 75 static const struct fsl_mmdc_devtype_data imx6qp_data = { 76 .flags = MMDC_FLAG_PROFILE_SEL, 77 }; 78 79 static const struct of_device_id imx_mmdc_dt_ids[] = { 80 { .compatible = "fsl,imx6q-mmdc", .data = (void *)&imx6q_data}, 81 { .compatible = "fsl,imx6qp-mmdc", .data = (void *)&imx6qp_data}, 82 { /* sentinel */ } 83 }; 84 85 #ifdef CONFIG_PERF_EVENTS 86 87 static enum cpuhp_state cpuhp_mmdc_state; 88 static DEFINE_IDA(mmdc_ida); 89 90 PMU_EVENT_ATTR_STRING(total-cycles, mmdc_pmu_total_cycles, "event=0x00") 91 PMU_EVENT_ATTR_STRING(busy-cycles, mmdc_pmu_busy_cycles, "event=0x01") 92 PMU_EVENT_ATTR_STRING(read-accesses, mmdc_pmu_read_accesses, "event=0x02") 93 PMU_EVENT_ATTR_STRING(write-accesses, mmdc_pmu_write_accesses, "event=0x03") 94 PMU_EVENT_ATTR_STRING(read-bytes, mmdc_pmu_read_bytes, "event=0x04") 95 PMU_EVENT_ATTR_STRING(read-bytes.unit, mmdc_pmu_read_bytes_unit, "MB"); 96 PMU_EVENT_ATTR_STRING(read-bytes.scale, mmdc_pmu_read_bytes_scale, "0.000001"); 97 PMU_EVENT_ATTR_STRING(write-bytes, mmdc_pmu_write_bytes, "event=0x05") 98 PMU_EVENT_ATTR_STRING(write-bytes.unit, mmdc_pmu_write_bytes_unit, "MB"); 99 PMU_EVENT_ATTR_STRING(write-bytes.scale, mmdc_pmu_write_bytes_scale, "0.000001"); 100 101 struct mmdc_pmu { 102 struct pmu pmu; 103 void __iomem *mmdc_base; 104 cpumask_t cpu; 105 struct hrtimer hrtimer; 106 unsigned int active_events; 107 struct device *dev; 108 struct perf_event *mmdc_events[MMDC_NUM_COUNTERS]; 109 struct hlist_node node; 110 struct fsl_mmdc_devtype_data *devtype_data; 111 }; 112 113 /* 114 * Polling period is set to one second, overflow of total-cycles (the fastest 115 * increasing counter) takes ten seconds so one second is safe 116 */ 117 static unsigned int mmdc_pmu_poll_period_us = 1000000; 118 119 module_param_named(pmu_pmu_poll_period_us, mmdc_pmu_poll_period_us, uint, 120 S_IRUGO | S_IWUSR); 121 122 static ktime_t mmdc_pmu_timer_period(void) 123 { 124 return ns_to_ktime((u64)mmdc_pmu_poll_period_us * 1000); 125 } 126 127 static ssize_t mmdc_pmu_cpumask_show(struct device *dev, 128 struct device_attribute *attr, char *buf) 129 { 130 struct mmdc_pmu *pmu_mmdc = dev_get_drvdata(dev); 131 132 return cpumap_print_to_pagebuf(true, buf, &pmu_mmdc->cpu); 133 } 134 135 static struct device_attribute mmdc_pmu_cpumask_attr = 136 __ATTR(cpumask, S_IRUGO, mmdc_pmu_cpumask_show, NULL); 137 138 static struct attribute *mmdc_pmu_cpumask_attrs[] = { 139 &mmdc_pmu_cpumask_attr.attr, 140 NULL, 141 }; 142 143 static struct attribute_group mmdc_pmu_cpumask_attr_group = { 144 .attrs = mmdc_pmu_cpumask_attrs, 145 }; 146 147 static struct attribute *mmdc_pmu_events_attrs[] = { 148 &mmdc_pmu_total_cycles.attr.attr, 149 &mmdc_pmu_busy_cycles.attr.attr, 150 &mmdc_pmu_read_accesses.attr.attr, 151 &mmdc_pmu_write_accesses.attr.attr, 152 &mmdc_pmu_read_bytes.attr.attr, 153 &mmdc_pmu_read_bytes_unit.attr.attr, 154 &mmdc_pmu_read_bytes_scale.attr.attr, 155 &mmdc_pmu_write_bytes.attr.attr, 156 &mmdc_pmu_write_bytes_unit.attr.attr, 157 &mmdc_pmu_write_bytes_scale.attr.attr, 158 NULL, 159 }; 160 161 static struct attribute_group mmdc_pmu_events_attr_group = { 162 .name = "events", 163 .attrs = mmdc_pmu_events_attrs, 164 }; 165 166 PMU_FORMAT_ATTR(event, "config:0-63"); 167 PMU_FORMAT_ATTR(axi_id, "config1:0-63"); 168 169 static struct attribute *mmdc_pmu_format_attrs[] = { 170 &format_attr_event.attr, 171 &format_attr_axi_id.attr, 172 NULL, 173 }; 174 175 static struct attribute_group mmdc_pmu_format_attr_group = { 176 .name = "format", 177 .attrs = mmdc_pmu_format_attrs, 178 }; 179 180 static const struct attribute_group *attr_groups[] = { 181 &mmdc_pmu_events_attr_group, 182 &mmdc_pmu_format_attr_group, 183 &mmdc_pmu_cpumask_attr_group, 184 NULL, 185 }; 186 187 static u32 mmdc_pmu_read_counter(struct mmdc_pmu *pmu_mmdc, int cfg) 188 { 189 void __iomem *mmdc_base, *reg; 190 191 mmdc_base = pmu_mmdc->mmdc_base; 192 193 switch (cfg) { 194 case TOTAL_CYCLES: 195 reg = mmdc_base + MMDC_MADPSR0; 196 break; 197 case BUSY_CYCLES: 198 reg = mmdc_base + MMDC_MADPSR1; 199 break; 200 case READ_ACCESSES: 201 reg = mmdc_base + MMDC_MADPSR2; 202 break; 203 case WRITE_ACCESSES: 204 reg = mmdc_base + MMDC_MADPSR3; 205 break; 206 case READ_BYTES: 207 reg = mmdc_base + MMDC_MADPSR4; 208 break; 209 case WRITE_BYTES: 210 reg = mmdc_base + MMDC_MADPSR5; 211 break; 212 default: 213 return WARN_ONCE(1, 214 "invalid configuration %d for mmdc counter", cfg); 215 } 216 return readl(reg); 217 } 218 219 static int mmdc_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) 220 { 221 struct mmdc_pmu *pmu_mmdc = hlist_entry_safe(node, struct mmdc_pmu, node); 222 int target; 223 224 if (!cpumask_test_and_clear_cpu(cpu, &pmu_mmdc->cpu)) 225 return 0; 226 227 target = cpumask_any_but(cpu_online_mask, cpu); 228 if (target >= nr_cpu_ids) 229 return 0; 230 231 perf_pmu_migrate_context(&pmu_mmdc->pmu, cpu, target); 232 cpumask_set_cpu(target, &pmu_mmdc->cpu); 233 234 return 0; 235 } 236 237 static bool mmdc_pmu_group_event_is_valid(struct perf_event *event, 238 struct pmu *pmu, 239 unsigned long *used_counters) 240 { 241 int cfg = event->attr.config; 242 243 if (is_software_event(event)) 244 return true; 245 246 if (event->pmu != pmu) 247 return false; 248 249 return !test_and_set_bit(cfg, used_counters); 250 } 251 252 /* 253 * Each event has a single fixed-purpose counter, so we can only have a 254 * single active event for each at any point in time. Here we just check 255 * for duplicates, and rely on mmdc_pmu_event_init to verify that the HW 256 * event numbers are valid. 257 */ 258 static bool mmdc_pmu_group_is_valid(struct perf_event *event) 259 { 260 struct pmu *pmu = event->pmu; 261 struct perf_event *leader = event->group_leader; 262 struct perf_event *sibling; 263 unsigned long counter_mask = 0; 264 265 set_bit(leader->attr.config, &counter_mask); 266 267 if (event != leader) { 268 if (!mmdc_pmu_group_event_is_valid(event, pmu, &counter_mask)) 269 return false; 270 } 271 272 list_for_each_entry(sibling, &leader->sibling_list, group_entry) { 273 if (!mmdc_pmu_group_event_is_valid(sibling, pmu, &counter_mask)) 274 return false; 275 } 276 277 return true; 278 } 279 280 static int mmdc_pmu_event_init(struct perf_event *event) 281 { 282 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu); 283 int cfg = event->attr.config; 284 285 if (event->attr.type != event->pmu->type) 286 return -ENOENT; 287 288 if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) 289 return -EOPNOTSUPP; 290 291 if (event->cpu < 0) { 292 dev_warn(pmu_mmdc->dev, "Can't provide per-task data!\n"); 293 return -EOPNOTSUPP; 294 } 295 296 if (event->attr.exclude_user || 297 event->attr.exclude_kernel || 298 event->attr.exclude_hv || 299 event->attr.exclude_idle || 300 event->attr.exclude_host || 301 event->attr.exclude_guest || 302 event->attr.sample_period) 303 return -EINVAL; 304 305 if (cfg < 0 || cfg >= MMDC_NUM_COUNTERS) 306 return -EINVAL; 307 308 if (!mmdc_pmu_group_is_valid(event)) 309 return -EINVAL; 310 311 event->cpu = cpumask_first(&pmu_mmdc->cpu); 312 return 0; 313 } 314 315 static void mmdc_pmu_event_update(struct perf_event *event) 316 { 317 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu); 318 struct hw_perf_event *hwc = &event->hw; 319 u64 delta, prev_raw_count, new_raw_count; 320 321 do { 322 prev_raw_count = local64_read(&hwc->prev_count); 323 new_raw_count = mmdc_pmu_read_counter(pmu_mmdc, 324 event->attr.config); 325 } while (local64_cmpxchg(&hwc->prev_count, prev_raw_count, 326 new_raw_count) != prev_raw_count); 327 328 delta = (new_raw_count - prev_raw_count) & 0xFFFFFFFF; 329 330 local64_add(delta, &event->count); 331 } 332 333 static void mmdc_pmu_event_start(struct perf_event *event, int flags) 334 { 335 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu); 336 struct hw_perf_event *hwc = &event->hw; 337 void __iomem *mmdc_base, *reg; 338 u32 val; 339 340 mmdc_base = pmu_mmdc->mmdc_base; 341 reg = mmdc_base + MMDC_MADPCR0; 342 343 /* 344 * hrtimer is required because mmdc does not provide an interrupt so 345 * polling is necessary 346 */ 347 hrtimer_start(&pmu_mmdc->hrtimer, mmdc_pmu_timer_period(), 348 HRTIMER_MODE_REL_PINNED); 349 350 local64_set(&hwc->prev_count, 0); 351 352 writel(DBG_RST, reg); 353 354 /* 355 * Write the AXI id parameter to MADPCR1. 356 */ 357 val = event->attr.config1; 358 reg = mmdc_base + MMDC_MADPCR1; 359 writel(val, reg); 360 361 reg = mmdc_base + MMDC_MADPCR0; 362 val = DBG_EN; 363 if (pmu_mmdc->devtype_data->flags & MMDC_FLAG_PROFILE_SEL) 364 val |= PROFILE_SEL; 365 366 writel(val, reg); 367 } 368 369 static int mmdc_pmu_event_add(struct perf_event *event, int flags) 370 { 371 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu); 372 struct hw_perf_event *hwc = &event->hw; 373 374 int cfg = event->attr.config; 375 376 if (flags & PERF_EF_START) 377 mmdc_pmu_event_start(event, flags); 378 379 if (pmu_mmdc->mmdc_events[cfg] != NULL) 380 return -EAGAIN; 381 382 pmu_mmdc->mmdc_events[cfg] = event; 383 pmu_mmdc->active_events++; 384 385 local64_set(&hwc->prev_count, mmdc_pmu_read_counter(pmu_mmdc, cfg)); 386 387 return 0; 388 } 389 390 static void mmdc_pmu_event_stop(struct perf_event *event, int flags) 391 { 392 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu); 393 void __iomem *mmdc_base, *reg; 394 395 mmdc_base = pmu_mmdc->mmdc_base; 396 reg = mmdc_base + MMDC_MADPCR0; 397 398 writel(PRF_FRZ, reg); 399 400 reg = mmdc_base + MMDC_MADPCR1; 401 writel(MMDC_PRF_AXI_ID_CLEAR, reg); 402 403 mmdc_pmu_event_update(event); 404 } 405 406 static void mmdc_pmu_event_del(struct perf_event *event, int flags) 407 { 408 struct mmdc_pmu *pmu_mmdc = to_mmdc_pmu(event->pmu); 409 int cfg = event->attr.config; 410 411 pmu_mmdc->mmdc_events[cfg] = NULL; 412 pmu_mmdc->active_events--; 413 414 if (pmu_mmdc->active_events == 0) 415 hrtimer_cancel(&pmu_mmdc->hrtimer); 416 417 mmdc_pmu_event_stop(event, PERF_EF_UPDATE); 418 } 419 420 static void mmdc_pmu_overflow_handler(struct mmdc_pmu *pmu_mmdc) 421 { 422 int i; 423 424 for (i = 0; i < MMDC_NUM_COUNTERS; i++) { 425 struct perf_event *event = pmu_mmdc->mmdc_events[i]; 426 427 if (event) 428 mmdc_pmu_event_update(event); 429 } 430 } 431 432 static enum hrtimer_restart mmdc_pmu_timer_handler(struct hrtimer *hrtimer) 433 { 434 struct mmdc_pmu *pmu_mmdc = container_of(hrtimer, struct mmdc_pmu, 435 hrtimer); 436 437 mmdc_pmu_overflow_handler(pmu_mmdc); 438 hrtimer_forward_now(hrtimer, mmdc_pmu_timer_period()); 439 440 return HRTIMER_RESTART; 441 } 442 443 static int mmdc_pmu_init(struct mmdc_pmu *pmu_mmdc, 444 void __iomem *mmdc_base, struct device *dev) 445 { 446 int mmdc_num; 447 448 *pmu_mmdc = (struct mmdc_pmu) { 449 .pmu = (struct pmu) { 450 .task_ctx_nr = perf_invalid_context, 451 .attr_groups = attr_groups, 452 .event_init = mmdc_pmu_event_init, 453 .add = mmdc_pmu_event_add, 454 .del = mmdc_pmu_event_del, 455 .start = mmdc_pmu_event_start, 456 .stop = mmdc_pmu_event_stop, 457 .read = mmdc_pmu_event_update, 458 }, 459 .mmdc_base = mmdc_base, 460 .dev = dev, 461 .active_events = 0, 462 }; 463 464 mmdc_num = ida_simple_get(&mmdc_ida, 0, 0, GFP_KERNEL); 465 466 return mmdc_num; 467 } 468 469 static int imx_mmdc_remove(struct platform_device *pdev) 470 { 471 struct mmdc_pmu *pmu_mmdc = platform_get_drvdata(pdev); 472 473 cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node); 474 perf_pmu_unregister(&pmu_mmdc->pmu); 475 kfree(pmu_mmdc); 476 return 0; 477 } 478 479 static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base) 480 { 481 struct mmdc_pmu *pmu_mmdc; 482 char *name; 483 int mmdc_num; 484 int ret; 485 const struct of_device_id *of_id = 486 of_match_device(imx_mmdc_dt_ids, &pdev->dev); 487 488 pmu_mmdc = kzalloc(sizeof(*pmu_mmdc), GFP_KERNEL); 489 if (!pmu_mmdc) { 490 pr_err("failed to allocate PMU device!\n"); 491 return -ENOMEM; 492 } 493 494 /* The first instance registers the hotplug state */ 495 if (!cpuhp_mmdc_state) { 496 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, 497 "perf/arm/mmdc:online", NULL, 498 mmdc_pmu_offline_cpu); 499 if (ret < 0) { 500 pr_err("cpuhp_setup_state_multi failed\n"); 501 goto pmu_free; 502 } 503 cpuhp_mmdc_state = ret; 504 } 505 506 mmdc_num = mmdc_pmu_init(pmu_mmdc, mmdc_base, &pdev->dev); 507 if (mmdc_num == 0) 508 name = "mmdc"; 509 else 510 name = devm_kasprintf(&pdev->dev, 511 GFP_KERNEL, "mmdc%d", mmdc_num); 512 513 pmu_mmdc->devtype_data = (struct fsl_mmdc_devtype_data *)of_id->data; 514 515 hrtimer_init(&pmu_mmdc->hrtimer, CLOCK_MONOTONIC, 516 HRTIMER_MODE_REL); 517 pmu_mmdc->hrtimer.function = mmdc_pmu_timer_handler; 518 519 cpumask_set_cpu(raw_smp_processor_id(), &pmu_mmdc->cpu); 520 521 /* Register the pmu instance for cpu hotplug */ 522 cpuhp_state_add_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node); 523 524 ret = perf_pmu_register(&(pmu_mmdc->pmu), name, -1); 525 if (ret) 526 goto pmu_register_err; 527 528 platform_set_drvdata(pdev, pmu_mmdc); 529 return 0; 530 531 pmu_register_err: 532 pr_warn("MMDC Perf PMU failed (%d), disabled\n", ret); 533 cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node); 534 hrtimer_cancel(&pmu_mmdc->hrtimer); 535 pmu_free: 536 kfree(pmu_mmdc); 537 return ret; 538 } 539 540 #else 541 #define imx_mmdc_remove NULL 542 #define imx_mmdc_perf_init(pdev, mmdc_base) 0 543 #endif 544 545 static int imx_mmdc_probe(struct platform_device *pdev) 546 { 547 struct device_node *np = pdev->dev.of_node; 548 void __iomem *mmdc_base, *reg; 549 u32 val; 550 int timeout = 0x400; 551 552 mmdc_base = of_iomap(np, 0); 553 WARN_ON(!mmdc_base); 554 555 reg = mmdc_base + MMDC_MDMISC; 556 /* Get ddr type */ 557 val = readl_relaxed(reg); 558 ddr_type = (val & BM_MMDC_MDMISC_DDR_TYPE) >> 559 BP_MMDC_MDMISC_DDR_TYPE; 560 561 reg = mmdc_base + MMDC_MAPSR; 562 563 /* Enable automatic power saving */ 564 val = readl_relaxed(reg); 565 val &= ~(1 << BP_MMDC_MAPSR_PSD); 566 writel_relaxed(val, reg); 567 568 /* Ensure it's successfully enabled */ 569 while (!(readl_relaxed(reg) & 1 << BP_MMDC_MAPSR_PSS) && --timeout) 570 cpu_relax(); 571 572 if (unlikely(!timeout)) { 573 pr_warn("%s: failed to enable automatic power saving\n", 574 __func__); 575 return -EBUSY; 576 } 577 578 return imx_mmdc_perf_init(pdev, mmdc_base); 579 } 580 581 int imx_mmdc_get_ddr_type(void) 582 { 583 return ddr_type; 584 } 585 586 static struct platform_driver imx_mmdc_driver = { 587 .driver = { 588 .name = "imx-mmdc", 589 .of_match_table = imx_mmdc_dt_ids, 590 }, 591 .probe = imx_mmdc_probe, 592 .remove = imx_mmdc_remove, 593 }; 594 595 static int __init imx_mmdc_init(void) 596 { 597 return platform_driver_register(&imx_mmdc_driver); 598 } 599 postcore_initcall(imx_mmdc_init); 600