drivers/perf/thunderx2_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * CAVIUM THUNDERX2 SoC PMU UNCORE
   4  * Copyright (C) 2018 Cavium Inc.
   5  * Author: Ganapatrao Kulkarni <gkulkarni@cavium.com>
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/cpuhotplug.h>
  10 #include <linux/perf_event.h>
  11 #include <linux/platform_device.h>
  12
  13 /* Each ThunderX2(TX2) Socket has a L3C and DMC UNCORE PMU device.
  14  * Each UNCORE PMU device consists of 4 independent programmable counters.
  15  * Counters are 32 bit and do not support overflow interrupt,
  16  * they need to be sampled before overflow(i.e, at every 2 seconds).
  17  */
  18
  19 #define TX2_PMU_MAX_COUNTERS            4
  20 #define TX2_PMU_DMC_CHANNELS            8
  21 #define TX2_PMU_L3_TILES                16
  22
  23 #define TX2_PMU_HRTIMER_INTERVAL        (2 * NSEC_PER_SEC)
  24 #define GET_EVENTID(ev)                 ((ev->hw.config) & 0x1f)
  25 #define GET_COUNTERID(ev)               ((ev->hw.idx) & 0x3)
  26  /* 1 byte per counter(4 counters).
  27   * Event id is encoded in bits [5:1] of a byte,
  28   */
  29 #define DMC_EVENT_CFG(idx, val)         ((val) << (((idx) * 8) + 1))
  30
  31 #define L3C_COUNTER_CTL                 0xA8
  32 #define L3C_COUNTER_DATA                0xAC
  33 #define DMC_COUNTER_CTL                 0x234
  34 #define DMC_COUNTER_DATA                0x240
  35
  36 /* L3C event IDs */
  37 #define L3_EVENT_READ_REQ               0xD
  38 #define L3_EVENT_WRITEBACK_REQ          0xE
  39 #define L3_EVENT_INV_N_WRITE_REQ        0xF
  40 #define L3_EVENT_INV_REQ                0x10
  41 #define L3_EVENT_EVICT_REQ              0x13
  42 #define L3_EVENT_INV_N_WRITE_HIT        0x14
  43 #define L3_EVENT_INV_HIT                0x15
  44 #define L3_EVENT_READ_HIT               0x17
  45 #define L3_EVENT_MAX                    0x18
  46
  47 /* DMC event IDs */
  48 #define DMC_EVENT_COUNT_CYCLES          0x1
  49 #define DMC_EVENT_WRITE_TXNS            0xB
  50 #define DMC_EVENT_DATA_TRANSFERS        0xD
  51 #define DMC_EVENT_READ_TXNS             0xF
  52 #define DMC_EVENT_MAX                   0x10
  53
  54 enum tx2_uncore_type {
  55         PMU_TYPE_L3C,
  56         PMU_TYPE_DMC,
  57         PMU_TYPE_INVALID,
  58 };
  59
  60 /*
  61  * pmu on each socket has 2 uncore devices(dmc and l3c),
  62  * each device has 4 counters.
  63  */
  64 struct tx2_uncore_pmu {
  65         struct hlist_node hpnode;
  66         struct list_head  entry;
  67         struct pmu pmu;
  68         char *name;
  69         int node;
  70         int cpu;
  71         u32 max_counters;
  72         u32 prorate_factor;
  73         u32 max_events;
  74         u64 hrtimer_interval;
  75         void __iomem *base;
  76         DECLARE_BITMAP(active_counters, TX2_PMU_MAX_COUNTERS);
  77         struct perf_event *events[TX2_PMU_MAX_COUNTERS];
  78         struct device *dev;
  79         struct hrtimer hrtimer;
  80         const struct attribute_group **attr_groups;
  81         enum tx2_uncore_type type;
  82         void (*init_cntr_base)(struct perf_event *event,
  83                         struct tx2_uncore_pmu *tx2_pmu);
  84         void (*stop_event)(struct perf_event *event);
  85         void (*start_event)(struct perf_event *event, int flags);
  86 };
  87
  88 static LIST_HEAD(tx2_pmus);
  89
  90 static inline struct tx2_uncore_pmu *pmu_to_tx2_pmu(struct pmu *pmu)
  91 {
  92         return container_of(pmu, struct tx2_uncore_pmu, pmu);
  93 }
  94
  95 PMU_FORMAT_ATTR(event,  "config:0-4");
  96
  97 static struct attribute *l3c_pmu_format_attrs[] = {
  98         &format_attr_event.attr,
  99         NULL,
 100 };
 101
 102 static struct attribute *dmc_pmu_format_attrs[] = {
 103         &format_attr_event.attr,
 104         NULL,
 105 };
 106
 107 static const struct attribute_group l3c_pmu_format_attr_group = {
 108         .name = "format",
 109         .attrs = l3c_pmu_format_attrs,
 110 };
 111
 112 static const struct attribute_group dmc_pmu_format_attr_group = {
 113         .name = "format",
 114         .attrs = dmc_pmu_format_attrs,
 115 };
 116
 117 /*
 118  * sysfs event attributes
 119  */
 120 static ssize_t tx2_pmu_event_show(struct device *dev,
 121                                     struct device_attribute *attr, char *buf)
 122 {
 123         struct dev_ext_attribute *eattr;
 124
 125         eattr = container_of(attr, struct dev_ext_attribute, attr);
 126         return sprintf(buf, "event=0x%lx\n", (unsigned long) eattr->var);
 127 }
 128
 129 #define TX2_EVENT_ATTR(name, config) \
 130         PMU_EVENT_ATTR(name, tx2_pmu_event_attr_##name, \
 131                         config, tx2_pmu_event_show)
 132
 133 TX2_EVENT_ATTR(read_request, L3_EVENT_READ_REQ);
 134 TX2_EVENT_ATTR(writeback_request, L3_EVENT_WRITEBACK_REQ);
 135 TX2_EVENT_ATTR(inv_nwrite_request, L3_EVENT_INV_N_WRITE_REQ);
 136 TX2_EVENT_ATTR(inv_request, L3_EVENT_INV_REQ);
 137 TX2_EVENT_ATTR(evict_request, L3_EVENT_EVICT_REQ);
 138 TX2_EVENT_ATTR(inv_nwrite_hit, L3_EVENT_INV_N_WRITE_HIT);
 139 TX2_EVENT_ATTR(inv_hit, L3_EVENT_INV_HIT);
 140 TX2_EVENT_ATTR(read_hit, L3_EVENT_READ_HIT);
 141
 142 static struct attribute *l3c_pmu_events_attrs[] = {
 143         &tx2_pmu_event_attr_read_request.attr.attr,
 144         &tx2_pmu_event_attr_writeback_request.attr.attr,
 145         &tx2_pmu_event_attr_inv_nwrite_request.attr.attr,
 146         &tx2_pmu_event_attr_inv_request.attr.attr,
 147         &tx2_pmu_event_attr_evict_request.attr.attr,
 148         &tx2_pmu_event_attr_inv_nwrite_hit.attr.attr,
 149         &tx2_pmu_event_attr_inv_hit.attr.attr,
 150         &tx2_pmu_event_attr_read_hit.attr.attr,
 151         NULL,
 152 };
 153
 154 TX2_EVENT_ATTR(cnt_cycles, DMC_EVENT_COUNT_CYCLES);
 155 TX2_EVENT_ATTR(write_txns, DMC_EVENT_WRITE_TXNS);
 156 TX2_EVENT_ATTR(data_transfers, DMC_EVENT_DATA_TRANSFERS);
 157 TX2_EVENT_ATTR(read_txns, DMC_EVENT_READ_TXNS);
 158
 159 static struct attribute *dmc_pmu_events_attrs[] = {
 160         &tx2_pmu_event_attr_cnt_cycles.attr.attr,
 161         &tx2_pmu_event_attr_write_txns.attr.attr,
 162         &tx2_pmu_event_attr_data_transfers.attr.attr,
 163         &tx2_pmu_event_attr_read_txns.attr.attr,
 164         NULL,
 165 };
 166
 167 static const struct attribute_group l3c_pmu_events_attr_group = {
 168         .name = "events",
 169         .attrs = l3c_pmu_events_attrs,
 170 };
 171
 172 static const struct attribute_group dmc_pmu_events_attr_group = {
 173         .name = "events",
 174         .attrs = dmc_pmu_events_attrs,
 175 };
 176
 177 /*
 178  * sysfs cpumask attributes
 179  */
 180 static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
 181                 char *buf)
 182 {
 183         struct tx2_uncore_pmu *tx2_pmu;
 184
 185         tx2_pmu = pmu_to_tx2_pmu(dev_get_drvdata(dev));
 186         return cpumap_print_to_pagebuf(true, buf, cpumask_of(tx2_pmu->cpu));
 187 }
 188 static DEVICE_ATTR_RO(cpumask);
 189
 190 static struct attribute *tx2_pmu_cpumask_attrs[] = {
 191         &dev_attr_cpumask.attr,
 192         NULL,
 193 };
 194
 195 static const struct attribute_group pmu_cpumask_attr_group = {
 196         .attrs = tx2_pmu_cpumask_attrs,
 197 };
 198
 199 /*
 200  * Per PMU device attribute groups
 201  */
 202 static const struct attribute_group *l3c_pmu_attr_groups[] = {
 203         &l3c_pmu_format_attr_group,
 204         &pmu_cpumask_attr_group,
 205         &l3c_pmu_events_attr_group,
 206         NULL
 207 };
 208
 209 static const struct attribute_group *dmc_pmu_attr_groups[] = {
 210         &dmc_pmu_format_attr_group,
 211         &pmu_cpumask_attr_group,
 212         &dmc_pmu_events_attr_group,
 213         NULL
 214 };
 215
 216 static inline u32 reg_readl(unsigned long addr)
 217 {
 218         return readl((void __iomem *)addr);
 219 }
 220
 221 static inline void reg_writel(u32 val, unsigned long addr)
 222 {
 223         writel(val, (void __iomem *)addr);
 224 }
 225
 226 static int alloc_counter(struct tx2_uncore_pmu *tx2_pmu)
 227 {
 228         int counter;
 229
 230         counter = find_first_zero_bit(tx2_pmu->active_counters,
 231                                 tx2_pmu->max_counters);
 232         if (counter == tx2_pmu->max_counters)
 233                 return -ENOSPC;
 234
 235         set_bit(counter, tx2_pmu->active_counters);
 236         return counter;
 237 }
 238
 239 static inline void free_counter(struct tx2_uncore_pmu *tx2_pmu, int counter)
 240 {
 241         clear_bit(counter, tx2_pmu->active_counters);
 242 }
 243
 244 static void init_cntr_base_l3c(struct perf_event *event,
 245                 struct tx2_uncore_pmu *tx2_pmu)
 246 {
 247         struct hw_perf_event *hwc = &event->hw;
 248
 249         /* counter ctrl/data reg offset at 8 */
 250         hwc->config_base = (unsigned long)tx2_pmu->base
 251                 + L3C_COUNTER_CTL + (8 * GET_COUNTERID(event));
 252         hwc->event_base =  (unsigned long)tx2_pmu->base
 253                 + L3C_COUNTER_DATA + (8 * GET_COUNTERID(event));
 254 }
 255
 256 static void init_cntr_base_dmc(struct perf_event *event,
 257                 struct tx2_uncore_pmu *tx2_pmu)
 258 {
 259         struct hw_perf_event *hwc = &event->hw;
 260
 261         hwc->config_base = (unsigned long)tx2_pmu->base
 262                 + DMC_COUNTER_CTL;
 263         /* counter data reg offset at 0xc */
 264         hwc->event_base = (unsigned long)tx2_pmu->base
 265                 + DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event));
 266 }
 267
 268 static void uncore_start_event_l3c(struct perf_event *event, int flags)
 269 {
 270         u32 val;
 271         struct hw_perf_event *hwc = &event->hw;
 272
 273         /* event id encoded in bits [07:03] */
 274         val = GET_EVENTID(event) << 3;
 275         reg_writel(val, hwc->config_base);
 276         local64_set(&hwc->prev_count, 0);
 277         reg_writel(0, hwc->event_base);
 278 }
 279
 280 static inline void uncore_stop_event_l3c(struct perf_event *event)
 281 {
 282         reg_writel(0, event->hw.config_base);
 283 }
 284
 285 static void uncore_start_event_dmc(struct perf_event *event, int flags)
 286 {
 287         u32 val;
 288         struct hw_perf_event *hwc = &event->hw;
 289         int idx = GET_COUNTERID(event);
 290         int event_id = GET_EVENTID(event);
 291
 292         /* enable and start counters.
 293          * 8 bits for each counter, bits[05:01] of a counter to set event type.
 294          */
 295         val = reg_readl(hwc->config_base);
 296         val &= ~DMC_EVENT_CFG(idx, 0x1f);
 297         val |= DMC_EVENT_CFG(idx, event_id);
 298         reg_writel(val, hwc->config_base);
 299         local64_set(&hwc->prev_count, 0);
 300         reg_writel(0, hwc->event_base);
 301 }
 302
 303 static void uncore_stop_event_dmc(struct perf_event *event)
 304 {
 305         u32 val;
 306         struct hw_perf_event *hwc = &event->hw;
 307         int idx = GET_COUNTERID(event);
 308
 309         /* clear event type(bits[05:01]) to stop counter */
 310         val = reg_readl(hwc->config_base);
 311         val &= ~DMC_EVENT_CFG(idx, 0x1f);
 312         reg_writel(val, hwc->config_base);
 313 }
 314
 315 static void tx2_uncore_event_update(struct perf_event *event)
 316 {
 317         s64 prev, delta, new = 0;
 318         struct hw_perf_event *hwc = &event->hw;
 319         struct tx2_uncore_pmu *tx2_pmu;
 320         enum tx2_uncore_type type;
 321         u32 prorate_factor;
 322
 323         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 324         type = tx2_pmu->type;
 325         prorate_factor = tx2_pmu->prorate_factor;
 326
 327         new = reg_readl(hwc->event_base);
 328         prev = local64_xchg(&hwc->prev_count, new);
 329
 330         /* handles rollover of 32 bit counter */
 331         delta = (u32)(((1UL << 32) - prev) + new);
 332
 333         /* DMC event data_transfers granularity is 16 Bytes, convert it to 64 */
 334         if (type == PMU_TYPE_DMC &&
 335                         GET_EVENTID(event) == DMC_EVENT_DATA_TRANSFERS)
 336                 delta = delta/4;
 337
 338         /* L3C and DMC has 16 and 8 interleave channels respectively.
 339          * The sampled value is for channel 0 and multiplied with
 340          * prorate_factor to get the count for a device.
 341          */
 342         local64_add(delta * prorate_factor, &event->count);
 343 }
 344
 345 static enum tx2_uncore_type get_tx2_pmu_type(struct acpi_device *adev)
 346 {
 347         int i = 0;
 348         struct acpi_tx2_pmu_device {
 349                 __u8 id[ACPI_ID_LEN];
 350                 enum tx2_uncore_type type;
 351         } devices[] = {
 352                 {"CAV901D", PMU_TYPE_L3C},
 353                 {"CAV901F", PMU_TYPE_DMC},
 354                 {"", PMU_TYPE_INVALID}
 355         };
 356
 357         while (devices[i].type != PMU_TYPE_INVALID) {
 358                 if (!strcmp(acpi_device_hid(adev), devices[i].id))
 359                         break;
 360                 i++;
 361         }
 362
 363         return devices[i].type;
 364 }
 365
 366 static bool tx2_uncore_validate_event(struct pmu *pmu,
 367                                   struct perf_event *event, int *counters)
 368 {
 369         if (is_software_event(event))
 370                 return true;
 371         /* Reject groups spanning multiple HW PMUs. */
 372         if (event->pmu != pmu)
 373                 return false;
 374
 375         *counters = *counters + 1;
 376         return true;
 377 }
 378
 379 /*
 380  * Make sure the group of events can be scheduled at once
 381  * on the PMU.
 382  */
 383 static bool tx2_uncore_validate_event_group(struct perf_event *event)
 384 {
 385         struct perf_event *sibling, *leader = event->group_leader;
 386         int counters = 0;
 387
 388         if (event->group_leader == event)
 389                 return true;
 390
 391         if (!tx2_uncore_validate_event(event->pmu, leader, &counters))
 392                 return false;
 393
 394         for_each_sibling_event(sibling, leader) {
 395                 if (!tx2_uncore_validate_event(event->pmu, sibling, &counters))
 396                         return false;
 397         }
 398
 399         if (!tx2_uncore_validate_event(event->pmu, event, &counters))
 400                 return false;
 401
 402         /*
 403          * If the group requires more counters than the HW has,
 404          * it cannot ever be scheduled.
 405          */
 406         return counters <= TX2_PMU_MAX_COUNTERS;
 407 }
 408
 409
 410 static int tx2_uncore_event_init(struct perf_event *event)
 411 {
 412         struct hw_perf_event *hwc = &event->hw;
 413         struct tx2_uncore_pmu *tx2_pmu;
 414
 415         /* Test the event attr type check for PMU enumeration */
 416         if (event->attr.type != event->pmu->type)
 417                 return -ENOENT;
 418
 419         /*
 420          * SOC PMU counters are shared across all cores.
 421          * Therefore, it does not support per-process mode.
 422          * Also, it does not support event sampling mode.
 423          */
 424         if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
 425                 return -EINVAL;
 426
 427         if (event->cpu < 0)
 428                 return -EINVAL;
 429
 430         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 431         if (tx2_pmu->cpu >= nr_cpu_ids)
 432                 return -EINVAL;
 433         event->cpu = tx2_pmu->cpu;
 434
 435         if (event->attr.config >= tx2_pmu->max_events)
 436                 return -EINVAL;
 437
 438         /* store event id */
 439         hwc->config = event->attr.config;
 440
 441         /* Validate the group */
 442         if (!tx2_uncore_validate_event_group(event))
 443                 return -EINVAL;
 444
 445         return 0;
 446 }
 447
 448 static void tx2_uncore_event_start(struct perf_event *event, int flags)
 449 {
 450         struct hw_perf_event *hwc = &event->hw;
 451         struct tx2_uncore_pmu *tx2_pmu;
 452
 453         hwc->state = 0;
 454         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 455
 456         tx2_pmu->start_event(event, flags);
 457         perf_event_update_userpage(event);
 458
 459         /* Start timer for first event */
 460         if (bitmap_weight(tx2_pmu->active_counters,
 461                                 tx2_pmu->max_counters) == 1) {
 462                 hrtimer_start(&tx2_pmu->hrtimer,
 463                         ns_to_ktime(tx2_pmu->hrtimer_interval),
 464                         HRTIMER_MODE_REL_PINNED);
 465         }
 466 }
 467
 468 static void tx2_uncore_event_stop(struct perf_event *event, int flags)
 469 {
 470         struct hw_perf_event *hwc = &event->hw;
 471         struct tx2_uncore_pmu *tx2_pmu;
 472
 473         if (hwc->state & PERF_HES_UPTODATE)
 474                 return;
 475
 476         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 477         tx2_pmu->stop_event(event);
 478         WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
 479         hwc->state |= PERF_HES_STOPPED;
 480         if (flags & PERF_EF_UPDATE) {
 481                 tx2_uncore_event_update(event);
 482                 hwc->state |= PERF_HES_UPTODATE;
 483         }
 484 }
 485
 486 static int tx2_uncore_event_add(struct perf_event *event, int flags)
 487 {
 488         struct hw_perf_event *hwc = &event->hw;
 489         struct tx2_uncore_pmu *tx2_pmu;
 490
 491         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 492
 493         /* Allocate a free counter */
 494         hwc->idx  = alloc_counter(tx2_pmu);
 495         if (hwc->idx < 0)
 496                 return -EAGAIN;
 497
 498         tx2_pmu->events[hwc->idx] = event;
 499         /* set counter control and data registers base address */
 500         tx2_pmu->init_cntr_base(event, tx2_pmu);
 501
 502         hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
 503         if (flags & PERF_EF_START)
 504                 tx2_uncore_event_start(event, flags);
 505
 506         return 0;
 507 }
 508
 509 static void tx2_uncore_event_del(struct perf_event *event, int flags)
 510 {
 511         struct tx2_uncore_pmu *tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 512         struct hw_perf_event *hwc = &event->hw;
 513
 514         tx2_uncore_event_stop(event, PERF_EF_UPDATE);
 515
 516         /* clear the assigned counter */
 517         free_counter(tx2_pmu, GET_COUNTERID(event));
 518
 519         perf_event_update_userpage(event);
 520         tx2_pmu->events[hwc->idx] = NULL;
 521         hwc->idx = -1;
 522 }
 523
 524 static void tx2_uncore_event_read(struct perf_event *event)
 525 {
 526         tx2_uncore_event_update(event);
 527 }
 528
 529 static enum hrtimer_restart tx2_hrtimer_callback(struct hrtimer *timer)
 530 {
 531         struct tx2_uncore_pmu *tx2_pmu;
 532         int max_counters, idx;
 533
 534         tx2_pmu = container_of(timer, struct tx2_uncore_pmu, hrtimer);
 535         max_counters = tx2_pmu->max_counters;
 536
 537         if (bitmap_empty(tx2_pmu->active_counters, max_counters))
 538                 return HRTIMER_NORESTART;
 539
 540         for_each_set_bit(idx, tx2_pmu->active_counters, max_counters) {
 541                 struct perf_event *event = tx2_pmu->events[idx];
 542
 543                 tx2_uncore_event_update(event);
 544         }
 545         hrtimer_forward_now(timer, ns_to_ktime(tx2_pmu->hrtimer_interval));
 546         return HRTIMER_RESTART;
 547 }
 548
 549 static int tx2_uncore_pmu_register(
 550                 struct tx2_uncore_pmu *tx2_pmu)
 551 {
 552         struct device *dev = tx2_pmu->dev;
 553         char *name = tx2_pmu->name;
 554
 555         /* Perf event registration */
 556         tx2_pmu->pmu = (struct pmu) {
 557                 .module         = THIS_MODULE,
 558                 .attr_groups    = tx2_pmu->attr_groups,
 559                 .task_ctx_nr    = perf_invalid_context,
 560                 .event_init     = tx2_uncore_event_init,
 561                 .add            = tx2_uncore_event_add,
 562                 .del            = tx2_uncore_event_del,
 563                 .start          = tx2_uncore_event_start,
 564                 .stop           = tx2_uncore_event_stop,
 565                 .read           = tx2_uncore_event_read,
 566                 .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 567         };
 568
 569         tx2_pmu->pmu.name = devm_kasprintf(dev, GFP_KERNEL,
 570                         "%s", name);
 571
 572         return perf_pmu_register(&tx2_pmu->pmu, tx2_pmu->pmu.name, -1);
 573 }
 574
 575 static int tx2_uncore_pmu_add_dev(struct tx2_uncore_pmu *tx2_pmu)
 576 {
 577         int ret, cpu;
 578
 579         cpu = cpumask_any_and(cpumask_of_node(tx2_pmu->node),
 580                         cpu_online_mask);
 581
 582         tx2_pmu->cpu = cpu;
 583         hrtimer_init(&tx2_pmu->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 584         tx2_pmu->hrtimer.function = tx2_hrtimer_callback;
 585
 586         ret = tx2_uncore_pmu_register(tx2_pmu);
 587         if (ret) {
 588                 dev_err(tx2_pmu->dev, "%s PMU: Failed to init driver\n",
 589                                 tx2_pmu->name);
 590                 return -ENODEV;
 591         }
 592
 593         /* register hotplug callback for the pmu */
 594         ret = cpuhp_state_add_instance(
 595                         CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
 596                         &tx2_pmu->hpnode);
 597         if (ret) {
 598                 dev_err(tx2_pmu->dev, "Error %d registering hotplug", ret);
 599                 return ret;
 600         }
 601
 602         /* Add to list */
 603         list_add(&tx2_pmu->entry, &tx2_pmus);
 604
 605         dev_dbg(tx2_pmu->dev, "%s PMU UNCORE registered\n",
 606                         tx2_pmu->pmu.name);
 607         return ret;
 608 }
 609
 610 static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
 611                 acpi_handle handle, struct acpi_device *adev, u32 type)
 612 {
 613         struct tx2_uncore_pmu *tx2_pmu;
 614         void __iomem *base;
 615         struct resource res;
 616         struct resource_entry *rentry;
 617         struct list_head list;
 618         int ret;
 619
 620         INIT_LIST_HEAD(&list);
 621         ret = acpi_dev_get_resources(adev, &list, NULL, NULL);
 622         if (ret <= 0) {
 623                 dev_err(dev, "failed to parse _CRS method, error %d\n", ret);
 624                 return NULL;
 625         }
 626
 627         list_for_each_entry(rentry, &list, node) {
 628                 if (resource_type(rentry->res) == IORESOURCE_MEM) {
 629                         res = *rentry->res;
 630                         break;
 631                 }
 632         }
 633
 634         if (!rentry->res)
 635                 return NULL;
 636
 637         acpi_dev_free_resource_list(&list);
 638         base = devm_ioremap_resource(dev, &res);
 639         if (IS_ERR(base)) {
 640                 dev_err(dev, "PMU type %d: Fail to map resource\n", type);
 641                 return NULL;
 642         }
 643
 644         tx2_pmu = devm_kzalloc(dev, sizeof(*tx2_pmu), GFP_KERNEL);
 645         if (!tx2_pmu)
 646                 return NULL;
 647
 648         tx2_pmu->dev = dev;
 649         tx2_pmu->type = type;
 650         tx2_pmu->base = base;
 651         tx2_pmu->node = dev_to_node(dev);
 652         INIT_LIST_HEAD(&tx2_pmu->entry);
 653
 654         switch (tx2_pmu->type) {
 655         case PMU_TYPE_L3C:
 656                 tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
 657                 tx2_pmu->prorate_factor = TX2_PMU_L3_TILES;
 658                 tx2_pmu->max_events = L3_EVENT_MAX;
 659                 tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
 660                 tx2_pmu->attr_groups = l3c_pmu_attr_groups;
 661                 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 662                                 "uncore_l3c_%d", tx2_pmu->node);
 663                 tx2_pmu->init_cntr_base = init_cntr_base_l3c;
 664                 tx2_pmu->start_event = uncore_start_event_l3c;
 665                 tx2_pmu->stop_event = uncore_stop_event_l3c;
 666                 break;
 667         case PMU_TYPE_DMC:
 668                 tx2_pmu->max_counters = TX2_PMU_MAX_COUNTERS;
 669                 tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
 670                 tx2_pmu->max_events = DMC_EVENT_MAX;
 671                 tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
 672                 tx2_pmu->attr_groups = dmc_pmu_attr_groups;
 673                 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 674                                 "uncore_dmc_%d", tx2_pmu->node);
 675                 tx2_pmu->init_cntr_base = init_cntr_base_dmc;
 676                 tx2_pmu->start_event = uncore_start_event_dmc;
 677                 tx2_pmu->stop_event = uncore_stop_event_dmc;
 678                 break;
 679         case PMU_TYPE_INVALID:
 680                 devm_kfree(dev, tx2_pmu);
 681                 return NULL;
 682         }
 683
 684         return tx2_pmu;
 685 }
 686
 687 static acpi_status tx2_uncore_pmu_add(acpi_handle handle, u32 level,
 688                                     void *data, void **return_value)
 689 {
 690         struct tx2_uncore_pmu *tx2_pmu;
 691         struct acpi_device *adev;
 692         enum tx2_uncore_type type;
 693
 694         if (acpi_bus_get_device(handle, &adev))
 695                 return AE_OK;
 696         if (acpi_bus_get_status(adev) || !adev->status.present)
 697                 return AE_OK;
 698
 699         type = get_tx2_pmu_type(adev);
 700         if (type == PMU_TYPE_INVALID)
 701                 return AE_OK;
 702
 703         tx2_pmu = tx2_uncore_pmu_init_dev((struct device *)data,
 704                         handle, adev, type);
 705
 706         if (!tx2_pmu)
 707                 return AE_ERROR;
 708
 709         if (tx2_uncore_pmu_add_dev(tx2_pmu)) {
 710                 /* Can't add the PMU device, abort */
 711                 return AE_ERROR;
 712         }
 713         return AE_OK;
 714 }
 715
 716 static int tx2_uncore_pmu_online_cpu(unsigned int cpu,
 717                 struct hlist_node *hpnode)
 718 {
 719         struct tx2_uncore_pmu *tx2_pmu;
 720
 721         tx2_pmu = hlist_entry_safe(hpnode,
 722                         struct tx2_uncore_pmu, hpnode);
 723
 724         /* Pick this CPU, If there is no CPU/PMU association and both are
 725          * from same node.
 726          */
 727         if ((tx2_pmu->cpu >= nr_cpu_ids) &&
 728                 (tx2_pmu->node == cpu_to_node(cpu)))
 729                 tx2_pmu->cpu = cpu;
 730
 731         return 0;
 732 }
 733
 734 static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
 735                 struct hlist_node *hpnode)
 736 {
 737         int new_cpu;
 738         struct tx2_uncore_pmu *tx2_pmu;
 739         struct cpumask cpu_online_mask_temp;
 740
 741         tx2_pmu = hlist_entry_safe(hpnode,
 742                         struct tx2_uncore_pmu, hpnode);
 743
 744         if (cpu != tx2_pmu->cpu)
 745                 return 0;
 746
 747         hrtimer_cancel(&tx2_pmu->hrtimer);
 748         cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
 749         cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
 750         new_cpu = cpumask_any_and(
 751                         cpumask_of_node(tx2_pmu->node),
 752                         &cpu_online_mask_temp);
 753
 754         tx2_pmu->cpu = new_cpu;
 755         if (new_cpu >= nr_cpu_ids)
 756                 return 0;
 757         perf_pmu_migrate_context(&tx2_pmu->pmu, cpu, new_cpu);
 758
 759         return 0;
 760 }
 761
 762 static const struct acpi_device_id tx2_uncore_acpi_match[] = {
 763         {"CAV901C", 0},
 764         {},
 765 };
 766 MODULE_DEVICE_TABLE(acpi, tx2_uncore_acpi_match);
 767
 768 static int tx2_uncore_probe(struct platform_device *pdev)
 769 {
 770         struct device *dev = &pdev->dev;
 771         acpi_handle handle;
 772         acpi_status status;
 773
 774         set_dev_node(dev, acpi_get_node(ACPI_HANDLE(dev)));
 775
 776         if (!has_acpi_companion(dev))
 777                 return -ENODEV;
 778
 779         handle = ACPI_HANDLE(dev);
 780         if (!handle)
 781                 return -EINVAL;
 782
 783         /* Walk through the tree for all PMU UNCORE devices */
 784         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
 785                                      tx2_uncore_pmu_add,
 786                                      NULL, dev, NULL);
 787         if (ACPI_FAILURE(status)) {
 788                 dev_err(dev, "failed to probe PMU devices\n");
 789                 return_ACPI_STATUS(status);
 790         }
 791
 792         dev_info(dev, "node%d: pmu uncore registered\n", dev_to_node(dev));
 793         return 0;
 794 }
 795
 796 static int tx2_uncore_remove(struct platform_device *pdev)
 797 {
 798         struct tx2_uncore_pmu *tx2_pmu, *temp;
 799         struct device *dev = &pdev->dev;
 800
 801         if (!list_empty(&tx2_pmus)) {
 802                 list_for_each_entry_safe(tx2_pmu, temp, &tx2_pmus, entry) {
 803                         if (tx2_pmu->node == dev_to_node(dev)) {
 804                                 cpuhp_state_remove_instance_nocalls(
 805                                         CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
 806                                         &tx2_pmu->hpnode);
 807                                 perf_pmu_unregister(&tx2_pmu->pmu);
 808                                 list_del(&tx2_pmu->entry);
 809                         }
 810                 }
 811         }
 812         return 0;
 813 }
 814
 815 static struct platform_driver tx2_uncore_driver = {
 816         .driver = {
 817                 .name           = "tx2-uncore-pmu",
 818                 .acpi_match_table = ACPI_PTR(tx2_uncore_acpi_match),
 819         },
 820         .probe = tx2_uncore_probe,
 821         .remove = tx2_uncore_remove,
 822 };
 823
 824 static int __init tx2_uncore_driver_init(void)
 825 {
 826         int ret;
 827
 828         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
 829                                       "perf/tx2/uncore:online",
 830                                       tx2_uncore_pmu_online_cpu,
 831                                       tx2_uncore_pmu_offline_cpu);
 832         if (ret) {
 833                 pr_err("TX2 PMU: setup hotplug failed(%d)\n", ret);
 834                 return ret;
 835         }
 836         ret = platform_driver_register(&tx2_uncore_driver);
 837         if (ret)
 838                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
 839
 840         return ret;
 841 }
 842 module_init(tx2_uncore_driver_init);
 843
 844 static void __exit tx2_uncore_driver_exit(void)
 845 {
 846         platform_driver_unregister(&tx2_uncore_driver);
 847         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
 848 }
 849 module_exit(tx2_uncore_driver_exit);
 850
 851 MODULE_DESCRIPTION("ThunderX2 UNCORE PMU driver");
 852 MODULE_LICENSE("GPL v2");
 853 MODULE_AUTHOR("Ganapatrao Kulkarni <gkulkarni@cavium.com>");