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_DMC_L3C_MAX_COUNTERS    4
  20 #define TX2_PMU_CCPI2_MAX_COUNTERS      8
  21 #define TX2_PMU_MAX_COUNTERS            TX2_PMU_CCPI2_MAX_COUNTERS
  22
  23
  24 #define TX2_PMU_DMC_CHANNELS            8
  25 #define TX2_PMU_L3_TILES                16
  26
  27 #define TX2_PMU_HRTIMER_INTERVAL        (2 * NSEC_PER_SEC)
  28 #define GET_EVENTID(ev, mask)           ((ev->hw.config) & mask)
  29 #define GET_COUNTERID(ev, mask)         ((ev->hw.idx) & mask)
  30  /* 1 byte per counter(4 counters).
  31   * Event id is encoded in bits [5:1] of a byte,
  32   */
  33 #define DMC_EVENT_CFG(idx, val)         ((val) << (((idx) * 8) + 1))
  34
  35 /* bits[3:0] to select counters, are indexed from 8 to 15. */
  36 #define CCPI2_COUNTER_OFFSET            8
  37
  38 #define L3C_COUNTER_CTL                 0xA8
  39 #define L3C_COUNTER_DATA                0xAC
  40 #define DMC_COUNTER_CTL                 0x234
  41 #define DMC_COUNTER_DATA                0x240
  42
  43 #define CCPI2_PERF_CTL                  0x108
  44 #define CCPI2_COUNTER_CTL               0x10C
  45 #define CCPI2_COUNTER_SEL               0x12c
  46 #define CCPI2_COUNTER_DATA_L            0x130
  47 #define CCPI2_COUNTER_DATA_H            0x134
  48
  49 /* L3C event IDs */
  50 #define L3_EVENT_READ_REQ               0xD
  51 #define L3_EVENT_WRITEBACK_REQ          0xE
  52 #define L3_EVENT_INV_N_WRITE_REQ        0xF
  53 #define L3_EVENT_INV_REQ                0x10
  54 #define L3_EVENT_EVICT_REQ              0x13
  55 #define L3_EVENT_INV_N_WRITE_HIT        0x14
  56 #define L3_EVENT_INV_HIT                0x15
  57 #define L3_EVENT_READ_HIT               0x17
  58 #define L3_EVENT_MAX                    0x18
  59
  60 /* DMC event IDs */
  61 #define DMC_EVENT_COUNT_CYCLES          0x1
  62 #define DMC_EVENT_WRITE_TXNS            0xB
  63 #define DMC_EVENT_DATA_TRANSFERS        0xD
  64 #define DMC_EVENT_READ_TXNS             0xF
  65 #define DMC_EVENT_MAX                   0x10
  66
  67 #define CCPI2_EVENT_REQ_PKT_SENT        0x3D
  68 #define CCPI2_EVENT_SNOOP_PKT_SENT      0x65
  69 #define CCPI2_EVENT_DATA_PKT_SENT       0x105
  70 #define CCPI2_EVENT_GIC_PKT_SENT        0x12D
  71 #define CCPI2_EVENT_MAX                 0x200
  72
  73 #define CCPI2_PERF_CTL_ENABLE           BIT(0)
  74 #define CCPI2_PERF_CTL_START            BIT(1)
  75 #define CCPI2_PERF_CTL_RESET            BIT(4)
  76 #define CCPI2_EVENT_LEVEL_RISING_EDGE   BIT(10)
  77 #define CCPI2_EVENT_TYPE_EDGE_SENSITIVE BIT(11)
  78
  79 enum tx2_uncore_type {
  80         PMU_TYPE_L3C,
  81         PMU_TYPE_DMC,
  82         PMU_TYPE_CCPI2,
  83         PMU_TYPE_INVALID,
  84 };
  85
  86 /*
  87  * Each socket has 3 uncore devices associated with a PMU. The DMC and
  88  * L3C have 4 32-bit counters and the CCPI2 has 8 64-bit counters.
  89  */
  90 struct tx2_uncore_pmu {
  91         struct hlist_node hpnode;
  92         struct list_head  entry;
  93         struct pmu pmu;
  94         char *name;
  95         int node;
  96         int cpu;
  97         u32 max_counters;
  98         u32 counters_mask;
  99         u32 prorate_factor;
 100         u32 max_events;
 101         u32 events_mask;
 102         u64 hrtimer_interval;
 103         void __iomem *base;
 104         DECLARE_BITMAP(active_counters, TX2_PMU_MAX_COUNTERS);
 105         struct perf_event *events[TX2_PMU_MAX_COUNTERS];
 106         struct device *dev;
 107         struct hrtimer hrtimer;
 108         const struct attribute_group **attr_groups;
 109         enum tx2_uncore_type type;
 110         enum hrtimer_restart (*hrtimer_callback)(struct hrtimer *cb);
 111         void (*init_cntr_base)(struct perf_event *event,
 112                         struct tx2_uncore_pmu *tx2_pmu);
 113         void (*stop_event)(struct perf_event *event);
 114         void (*start_event)(struct perf_event *event, int flags);
 115 };
 116
 117 static LIST_HEAD(tx2_pmus);
 118
 119 static inline struct tx2_uncore_pmu *pmu_to_tx2_pmu(struct pmu *pmu)
 120 {
 121         return container_of(pmu, struct tx2_uncore_pmu, pmu);
 122 }
 123
 124 #define TX2_PMU_FORMAT_ATTR(_var, _name, _format)                       \
 125 static ssize_t                                                          \
 126 __tx2_pmu_##_var##_show(struct device *dev,                             \
 127                                struct device_attribute *attr,           \
 128                                char *page)                              \
 129 {                                                                       \
 130         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
 131         return sysfs_emit(page, _format "\n");                          \
 132 }                                                                       \
 133                                                                         \
 134 static struct device_attribute format_attr_##_var =                     \
 135         __ATTR(_name, 0444, __tx2_pmu_##_var##_show, NULL)
 136
 137 TX2_PMU_FORMAT_ATTR(event, event, "config:0-4");
 138 TX2_PMU_FORMAT_ATTR(event_ccpi2, event, "config:0-9");
 139
 140 static struct attribute *l3c_pmu_format_attrs[] = {
 141         &format_attr_event.attr,
 142         NULL,
 143 };
 144
 145 static struct attribute *dmc_pmu_format_attrs[] = {
 146         &format_attr_event.attr,
 147         NULL,
 148 };
 149
 150 static struct attribute *ccpi2_pmu_format_attrs[] = {
 151         &format_attr_event_ccpi2.attr,
 152         NULL,
 153 };
 154
 155 static const struct attribute_group l3c_pmu_format_attr_group = {
 156         .name = "format",
 157         .attrs = l3c_pmu_format_attrs,
 158 };
 159
 160 static const struct attribute_group dmc_pmu_format_attr_group = {
 161         .name = "format",
 162         .attrs = dmc_pmu_format_attrs,
 163 };
 164
 165 static const struct attribute_group ccpi2_pmu_format_attr_group = {
 166         .name = "format",
 167         .attrs = ccpi2_pmu_format_attrs,
 168 };
 169
 170 /*
 171  * sysfs event attributes
 172  */
 173 static ssize_t tx2_pmu_event_show(struct device *dev,
 174                                     struct device_attribute *attr, char *buf)
 175 {
 176         struct dev_ext_attribute *eattr;
 177
 178         eattr = container_of(attr, struct dev_ext_attribute, attr);
 179         return sysfs_emit(buf, "event=0x%lx\n", (unsigned long) eattr->var);
 180 }
 181
 182 #define TX2_EVENT_ATTR(name, config) \
 183         PMU_EVENT_ATTR(name, tx2_pmu_event_attr_##name, \
 184                         config, tx2_pmu_event_show)
 185
 186 TX2_EVENT_ATTR(read_request, L3_EVENT_READ_REQ);
 187 TX2_EVENT_ATTR(writeback_request, L3_EVENT_WRITEBACK_REQ);
 188 TX2_EVENT_ATTR(inv_nwrite_request, L3_EVENT_INV_N_WRITE_REQ);
 189 TX2_EVENT_ATTR(inv_request, L3_EVENT_INV_REQ);
 190 TX2_EVENT_ATTR(evict_request, L3_EVENT_EVICT_REQ);
 191 TX2_EVENT_ATTR(inv_nwrite_hit, L3_EVENT_INV_N_WRITE_HIT);
 192 TX2_EVENT_ATTR(inv_hit, L3_EVENT_INV_HIT);
 193 TX2_EVENT_ATTR(read_hit, L3_EVENT_READ_HIT);
 194
 195 static struct attribute *l3c_pmu_events_attrs[] = {
 196         &tx2_pmu_event_attr_read_request.attr.attr,
 197         &tx2_pmu_event_attr_writeback_request.attr.attr,
 198         &tx2_pmu_event_attr_inv_nwrite_request.attr.attr,
 199         &tx2_pmu_event_attr_inv_request.attr.attr,
 200         &tx2_pmu_event_attr_evict_request.attr.attr,
 201         &tx2_pmu_event_attr_inv_nwrite_hit.attr.attr,
 202         &tx2_pmu_event_attr_inv_hit.attr.attr,
 203         &tx2_pmu_event_attr_read_hit.attr.attr,
 204         NULL,
 205 };
 206
 207 TX2_EVENT_ATTR(cnt_cycles, DMC_EVENT_COUNT_CYCLES);
 208 TX2_EVENT_ATTR(write_txns, DMC_EVENT_WRITE_TXNS);
 209 TX2_EVENT_ATTR(data_transfers, DMC_EVENT_DATA_TRANSFERS);
 210 TX2_EVENT_ATTR(read_txns, DMC_EVENT_READ_TXNS);
 211
 212 static struct attribute *dmc_pmu_events_attrs[] = {
 213         &tx2_pmu_event_attr_cnt_cycles.attr.attr,
 214         &tx2_pmu_event_attr_write_txns.attr.attr,
 215         &tx2_pmu_event_attr_data_transfers.attr.attr,
 216         &tx2_pmu_event_attr_read_txns.attr.attr,
 217         NULL,
 218 };
 219
 220 TX2_EVENT_ATTR(req_pktsent, CCPI2_EVENT_REQ_PKT_SENT);
 221 TX2_EVENT_ATTR(snoop_pktsent, CCPI2_EVENT_SNOOP_PKT_SENT);
 222 TX2_EVENT_ATTR(data_pktsent, CCPI2_EVENT_DATA_PKT_SENT);
 223 TX2_EVENT_ATTR(gic_pktsent, CCPI2_EVENT_GIC_PKT_SENT);
 224
 225 static struct attribute *ccpi2_pmu_events_attrs[] = {
 226         &tx2_pmu_event_attr_req_pktsent.attr.attr,
 227         &tx2_pmu_event_attr_snoop_pktsent.attr.attr,
 228         &tx2_pmu_event_attr_data_pktsent.attr.attr,
 229         &tx2_pmu_event_attr_gic_pktsent.attr.attr,
 230         NULL,
 231 };
 232
 233 static const struct attribute_group l3c_pmu_events_attr_group = {
 234         .name = "events",
 235         .attrs = l3c_pmu_events_attrs,
 236 };
 237
 238 static const struct attribute_group dmc_pmu_events_attr_group = {
 239         .name = "events",
 240         .attrs = dmc_pmu_events_attrs,
 241 };
 242
 243 static const struct attribute_group ccpi2_pmu_events_attr_group = {
 244         .name = "events",
 245         .attrs = ccpi2_pmu_events_attrs,
 246 };
 247
 248 /*
 249  * sysfs cpumask attributes
 250  */
 251 static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
 252                 char *buf)
 253 {
 254         struct tx2_uncore_pmu *tx2_pmu;
 255
 256         tx2_pmu = pmu_to_tx2_pmu(dev_get_drvdata(dev));
 257         return cpumap_print_to_pagebuf(true, buf, cpumask_of(tx2_pmu->cpu));
 258 }
 259 static DEVICE_ATTR_RO(cpumask);
 260
 261 static struct attribute *tx2_pmu_cpumask_attrs[] = {
 262         &dev_attr_cpumask.attr,
 263         NULL,
 264 };
 265
 266 static const struct attribute_group pmu_cpumask_attr_group = {
 267         .attrs = tx2_pmu_cpumask_attrs,
 268 };
 269
 270 /*
 271  * Per PMU device attribute groups
 272  */
 273 static const struct attribute_group *l3c_pmu_attr_groups[] = {
 274         &l3c_pmu_format_attr_group,
 275         &pmu_cpumask_attr_group,
 276         &l3c_pmu_events_attr_group,
 277         NULL
 278 };
 279
 280 static const struct attribute_group *dmc_pmu_attr_groups[] = {
 281         &dmc_pmu_format_attr_group,
 282         &pmu_cpumask_attr_group,
 283         &dmc_pmu_events_attr_group,
 284         NULL
 285 };
 286
 287 static const struct attribute_group *ccpi2_pmu_attr_groups[] = {
 288         &ccpi2_pmu_format_attr_group,
 289         &pmu_cpumask_attr_group,
 290         &ccpi2_pmu_events_attr_group,
 291         NULL
 292 };
 293
 294 static inline u32 reg_readl(unsigned long addr)
 295 {
 296         return readl((void __iomem *)addr);
 297 }
 298
 299 static inline void reg_writel(u32 val, unsigned long addr)
 300 {
 301         writel(val, (void __iomem *)addr);
 302 }
 303
 304 static int alloc_counter(struct tx2_uncore_pmu *tx2_pmu)
 305 {
 306         int counter;
 307
 308         counter = find_first_zero_bit(tx2_pmu->active_counters,
 309                                 tx2_pmu->max_counters);
 310         if (counter == tx2_pmu->max_counters)
 311                 return -ENOSPC;
 312
 313         set_bit(counter, tx2_pmu->active_counters);
 314         return counter;
 315 }
 316
 317 static inline void free_counter(struct tx2_uncore_pmu *tx2_pmu, int counter)
 318 {
 319         clear_bit(counter, tx2_pmu->active_counters);
 320 }
 321
 322 static void init_cntr_base_l3c(struct perf_event *event,
 323                 struct tx2_uncore_pmu *tx2_pmu)
 324 {
 325         struct hw_perf_event *hwc = &event->hw;
 326         u32 cmask;
 327
 328         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 329         cmask = tx2_pmu->counters_mask;
 330
 331         /* counter ctrl/data reg offset at 8 */
 332         hwc->config_base = (unsigned long)tx2_pmu->base
 333                 + L3C_COUNTER_CTL + (8 * GET_COUNTERID(event, cmask));
 334         hwc->event_base =  (unsigned long)tx2_pmu->base
 335                 + L3C_COUNTER_DATA + (8 * GET_COUNTERID(event, cmask));
 336 }
 337
 338 static void init_cntr_base_dmc(struct perf_event *event,
 339                 struct tx2_uncore_pmu *tx2_pmu)
 340 {
 341         struct hw_perf_event *hwc = &event->hw;
 342         u32 cmask;
 343
 344         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 345         cmask = tx2_pmu->counters_mask;
 346
 347         hwc->config_base = (unsigned long)tx2_pmu->base
 348                 + DMC_COUNTER_CTL;
 349         /* counter data reg offset at 0xc */
 350         hwc->event_base = (unsigned long)tx2_pmu->base
 351                 + DMC_COUNTER_DATA + (0xc * GET_COUNTERID(event, cmask));
 352 }
 353
 354 static void init_cntr_base_ccpi2(struct perf_event *event,
 355                 struct tx2_uncore_pmu *tx2_pmu)
 356 {
 357         struct hw_perf_event *hwc = &event->hw;
 358         u32 cmask;
 359
 360         cmask = tx2_pmu->counters_mask;
 361
 362         hwc->config_base = (unsigned long)tx2_pmu->base
 363                 + CCPI2_COUNTER_CTL + (4 * GET_COUNTERID(event, cmask));
 364         hwc->event_base =  (unsigned long)tx2_pmu->base;
 365 }
 366
 367 static void uncore_start_event_l3c(struct perf_event *event, int flags)
 368 {
 369         u32 val, emask;
 370         struct hw_perf_event *hwc = &event->hw;
 371         struct tx2_uncore_pmu *tx2_pmu;
 372
 373         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 374         emask = tx2_pmu->events_mask;
 375
 376         /* event id encoded in bits [07:03] */
 377         val = GET_EVENTID(event, emask) << 3;
 378         reg_writel(val, hwc->config_base);
 379         local64_set(&hwc->prev_count, 0);
 380         reg_writel(0, hwc->event_base);
 381 }
 382
 383 static inline void uncore_stop_event_l3c(struct perf_event *event)
 384 {
 385         reg_writel(0, event->hw.config_base);
 386 }
 387
 388 static void uncore_start_event_dmc(struct perf_event *event, int flags)
 389 {
 390         u32 val, cmask, emask;
 391         struct hw_perf_event *hwc = &event->hw;
 392         struct tx2_uncore_pmu *tx2_pmu;
 393         int idx, event_id;
 394
 395         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 396         cmask = tx2_pmu->counters_mask;
 397         emask = tx2_pmu->events_mask;
 398
 399         idx = GET_COUNTERID(event, cmask);
 400         event_id = GET_EVENTID(event, emask);
 401
 402         /* enable and start counters.
 403          * 8 bits for each counter, bits[05:01] of a counter to set event type.
 404          */
 405         val = reg_readl(hwc->config_base);
 406         val &= ~DMC_EVENT_CFG(idx, 0x1f);
 407         val |= DMC_EVENT_CFG(idx, event_id);
 408         reg_writel(val, hwc->config_base);
 409         local64_set(&hwc->prev_count, 0);
 410         reg_writel(0, hwc->event_base);
 411 }
 412
 413 static void uncore_stop_event_dmc(struct perf_event *event)
 414 {
 415         u32 val, cmask;
 416         struct hw_perf_event *hwc = &event->hw;
 417         struct tx2_uncore_pmu *tx2_pmu;
 418         int idx;
 419
 420         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 421         cmask = tx2_pmu->counters_mask;
 422         idx = GET_COUNTERID(event, cmask);
 423
 424         /* clear event type(bits[05:01]) to stop counter */
 425         val = reg_readl(hwc->config_base);
 426         val &= ~DMC_EVENT_CFG(idx, 0x1f);
 427         reg_writel(val, hwc->config_base);
 428 }
 429
 430 static void uncore_start_event_ccpi2(struct perf_event *event, int flags)
 431 {
 432         u32 emask;
 433         struct hw_perf_event *hwc = &event->hw;
 434         struct tx2_uncore_pmu *tx2_pmu;
 435
 436         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 437         emask = tx2_pmu->events_mask;
 438
 439         /* Bit [09:00] to set event id.
 440          * Bits [10], set level to rising edge.
 441          * Bits [11], set type to edge sensitive.
 442          */
 443         reg_writel((CCPI2_EVENT_TYPE_EDGE_SENSITIVE |
 444                         CCPI2_EVENT_LEVEL_RISING_EDGE |
 445                         GET_EVENTID(event, emask)), hwc->config_base);
 446
 447         /* reset[4], enable[0] and start[1] counters */
 448         reg_writel(CCPI2_PERF_CTL_RESET |
 449                         CCPI2_PERF_CTL_START |
 450                         CCPI2_PERF_CTL_ENABLE,
 451                         hwc->event_base + CCPI2_PERF_CTL);
 452         local64_set(&event->hw.prev_count, 0ULL);
 453 }
 454
 455 static void uncore_stop_event_ccpi2(struct perf_event *event)
 456 {
 457         struct hw_perf_event *hwc = &event->hw;
 458
 459         /* disable and stop counter */
 460         reg_writel(0, hwc->event_base + CCPI2_PERF_CTL);
 461 }
 462
 463 static void tx2_uncore_event_update(struct perf_event *event)
 464 {
 465         u64 prev, delta, new = 0;
 466         struct hw_perf_event *hwc = &event->hw;
 467         struct tx2_uncore_pmu *tx2_pmu;
 468         enum tx2_uncore_type type;
 469         u32 prorate_factor;
 470         u32 cmask, emask;
 471
 472         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 473         type = tx2_pmu->type;
 474         cmask = tx2_pmu->counters_mask;
 475         emask = tx2_pmu->events_mask;
 476         prorate_factor = tx2_pmu->prorate_factor;
 477         if (type == PMU_TYPE_CCPI2) {
 478                 reg_writel(CCPI2_COUNTER_OFFSET +
 479                                 GET_COUNTERID(event, cmask),
 480                                 hwc->event_base + CCPI2_COUNTER_SEL);
 481                 new = reg_readl(hwc->event_base + CCPI2_COUNTER_DATA_H);
 482                 new = (new << 32) +
 483                         reg_readl(hwc->event_base + CCPI2_COUNTER_DATA_L);
 484                 prev = local64_xchg(&hwc->prev_count, new);
 485                 delta = new - prev;
 486         } else {
 487                 new = reg_readl(hwc->event_base);
 488                 prev = local64_xchg(&hwc->prev_count, new);
 489                 /* handles rollover of 32 bit counter */
 490                 delta = (u32)(((1ULL << 32) - prev) + new);
 491         }
 492
 493         /* DMC event data_transfers granularity is 16 Bytes, convert it to 64 */
 494         if (type == PMU_TYPE_DMC &&
 495                         GET_EVENTID(event, emask) == DMC_EVENT_DATA_TRANSFERS)
 496                 delta = delta/4;
 497
 498         /* L3C and DMC has 16 and 8 interleave channels respectively.
 499          * The sampled value is for channel 0 and multiplied with
 500          * prorate_factor to get the count for a device.
 501          */
 502         local64_add(delta * prorate_factor, &event->count);
 503 }
 504
 505 static enum tx2_uncore_type get_tx2_pmu_type(struct acpi_device *adev)
 506 {
 507         int i = 0;
 508         struct acpi_tx2_pmu_device {
 509                 __u8 id[ACPI_ID_LEN];
 510                 enum tx2_uncore_type type;
 511         } devices[] = {
 512                 {"CAV901D", PMU_TYPE_L3C},
 513                 {"CAV901F", PMU_TYPE_DMC},
 514                 {"CAV901E", PMU_TYPE_CCPI2},
 515                 {"", PMU_TYPE_INVALID}
 516         };
 517
 518         while (devices[i].type != PMU_TYPE_INVALID) {
 519                 if (!strcmp(acpi_device_hid(adev), devices[i].id))
 520                         break;
 521                 i++;
 522         }
 523
 524         return devices[i].type;
 525 }
 526
 527 static bool tx2_uncore_validate_event(struct pmu *pmu,
 528                                   struct perf_event *event, int *counters)
 529 {
 530         if (is_software_event(event))
 531                 return true;
 532         /* Reject groups spanning multiple HW PMUs. */
 533         if (event->pmu != pmu)
 534                 return false;
 535
 536         *counters = *counters + 1;
 537         return true;
 538 }
 539
 540 /*
 541  * Make sure the group of events can be scheduled at once
 542  * on the PMU.
 543  */
 544 static bool tx2_uncore_validate_event_group(struct perf_event *event,
 545                 int max_counters)
 546 {
 547         struct perf_event *sibling, *leader = event->group_leader;
 548         int counters = 0;
 549
 550         if (event->group_leader == event)
 551                 return true;
 552
 553         if (!tx2_uncore_validate_event(event->pmu, leader, &counters))
 554                 return false;
 555
 556         for_each_sibling_event(sibling, leader) {
 557                 if (!tx2_uncore_validate_event(event->pmu, sibling, &counters))
 558                         return false;
 559         }
 560
 561         if (!tx2_uncore_validate_event(event->pmu, event, &counters))
 562                 return false;
 563
 564         /*
 565          * If the group requires more counters than the HW has,
 566          * it cannot ever be scheduled.
 567          */
 568         return counters <= max_counters;
 569 }
 570
 571
 572 static int tx2_uncore_event_init(struct perf_event *event)
 573 {
 574         struct hw_perf_event *hwc = &event->hw;
 575         struct tx2_uncore_pmu *tx2_pmu;
 576
 577         /* Test the event attr type check for PMU enumeration */
 578         if (event->attr.type != event->pmu->type)
 579                 return -ENOENT;
 580
 581         /*
 582          * SOC PMU counters are shared across all cores.
 583          * Therefore, it does not support per-process mode.
 584          * Also, it does not support event sampling mode.
 585          */
 586         if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
 587                 return -EINVAL;
 588
 589         if (event->cpu < 0)
 590                 return -EINVAL;
 591
 592         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 593         if (tx2_pmu->cpu >= nr_cpu_ids)
 594                 return -EINVAL;
 595         event->cpu = tx2_pmu->cpu;
 596
 597         if (event->attr.config >= tx2_pmu->max_events)
 598                 return -EINVAL;
 599
 600         /* store event id */
 601         hwc->config = event->attr.config;
 602
 603         /* Validate the group */
 604         if (!tx2_uncore_validate_event_group(event, tx2_pmu->max_counters))
 605                 return -EINVAL;
 606
 607         return 0;
 608 }
 609
 610 static void tx2_uncore_event_start(struct perf_event *event, int flags)
 611 {
 612         struct hw_perf_event *hwc = &event->hw;
 613         struct tx2_uncore_pmu *tx2_pmu;
 614
 615         hwc->state = 0;
 616         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 617
 618         tx2_pmu->start_event(event, flags);
 619         perf_event_update_userpage(event);
 620
 621         /* No hrtimer needed for CCPI2, 64-bit counters */
 622         if (!tx2_pmu->hrtimer_callback)
 623                 return;
 624
 625         /* Start timer for first event */
 626         if (bitmap_weight(tx2_pmu->active_counters,
 627                                 tx2_pmu->max_counters) == 1) {
 628                 hrtimer_start(&tx2_pmu->hrtimer,
 629                         ns_to_ktime(tx2_pmu->hrtimer_interval),
 630                         HRTIMER_MODE_REL_PINNED);
 631         }
 632 }
 633
 634 static void tx2_uncore_event_stop(struct perf_event *event, int flags)
 635 {
 636         struct hw_perf_event *hwc = &event->hw;
 637         struct tx2_uncore_pmu *tx2_pmu;
 638
 639         if (hwc->state & PERF_HES_UPTODATE)
 640                 return;
 641
 642         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 643         tx2_pmu->stop_event(event);
 644         WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
 645         hwc->state |= PERF_HES_STOPPED;
 646         if (flags & PERF_EF_UPDATE) {
 647                 tx2_uncore_event_update(event);
 648                 hwc->state |= PERF_HES_UPTODATE;
 649         }
 650 }
 651
 652 static int tx2_uncore_event_add(struct perf_event *event, int flags)
 653 {
 654         struct hw_perf_event *hwc = &event->hw;
 655         struct tx2_uncore_pmu *tx2_pmu;
 656
 657         tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 658
 659         /* Allocate a free counter */
 660         hwc->idx  = alloc_counter(tx2_pmu);
 661         if (hwc->idx < 0)
 662                 return -EAGAIN;
 663
 664         tx2_pmu->events[hwc->idx] = event;
 665         /* set counter control and data registers base address */
 666         tx2_pmu->init_cntr_base(event, tx2_pmu);
 667
 668         hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
 669         if (flags & PERF_EF_START)
 670                 tx2_uncore_event_start(event, flags);
 671
 672         return 0;
 673 }
 674
 675 static void tx2_uncore_event_del(struct perf_event *event, int flags)
 676 {
 677         struct tx2_uncore_pmu *tx2_pmu = pmu_to_tx2_pmu(event->pmu);
 678         struct hw_perf_event *hwc = &event->hw;
 679         u32 cmask;
 680
 681         cmask = tx2_pmu->counters_mask;
 682         tx2_uncore_event_stop(event, PERF_EF_UPDATE);
 683
 684         /* clear the assigned counter */
 685         free_counter(tx2_pmu, GET_COUNTERID(event, cmask));
 686
 687         perf_event_update_userpage(event);
 688         tx2_pmu->events[hwc->idx] = NULL;
 689         hwc->idx = -1;
 690
 691         if (!tx2_pmu->hrtimer_callback)
 692                 return;
 693
 694         if (bitmap_empty(tx2_pmu->active_counters, tx2_pmu->max_counters))
 695                 hrtimer_cancel(&tx2_pmu->hrtimer);
 696 }
 697
 698 static void tx2_uncore_event_read(struct perf_event *event)
 699 {
 700         tx2_uncore_event_update(event);
 701 }
 702
 703 static enum hrtimer_restart tx2_hrtimer_callback(struct hrtimer *timer)
 704 {
 705         struct tx2_uncore_pmu *tx2_pmu;
 706         int max_counters, idx;
 707
 708         tx2_pmu = container_of(timer, struct tx2_uncore_pmu, hrtimer);
 709         max_counters = tx2_pmu->max_counters;
 710
 711         if (bitmap_empty(tx2_pmu->active_counters, max_counters))
 712                 return HRTIMER_NORESTART;
 713
 714         for_each_set_bit(idx, tx2_pmu->active_counters, max_counters) {
 715                 struct perf_event *event = tx2_pmu->events[idx];
 716
 717                 tx2_uncore_event_update(event);
 718         }
 719         hrtimer_forward_now(timer, ns_to_ktime(tx2_pmu->hrtimer_interval));
 720         return HRTIMER_RESTART;
 721 }
 722
 723 static int tx2_uncore_pmu_register(
 724                 struct tx2_uncore_pmu *tx2_pmu)
 725 {
 726         struct device *dev = tx2_pmu->dev;
 727         char *name = tx2_pmu->name;
 728
 729         /* Perf event registration */
 730         tx2_pmu->pmu = (struct pmu) {
 731                 .module         = THIS_MODULE,
 732                 .attr_groups    = tx2_pmu->attr_groups,
 733                 .task_ctx_nr    = perf_invalid_context,
 734                 .event_init     = tx2_uncore_event_init,
 735                 .add            = tx2_uncore_event_add,
 736                 .del            = tx2_uncore_event_del,
 737                 .start          = tx2_uncore_event_start,
 738                 .stop           = tx2_uncore_event_stop,
 739                 .read           = tx2_uncore_event_read,
 740                 .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 741         };
 742
 743         tx2_pmu->pmu.name = devm_kasprintf(dev, GFP_KERNEL,
 744                         "%s", name);
 745
 746         return perf_pmu_register(&tx2_pmu->pmu, tx2_pmu->pmu.name, -1);
 747 }
 748
 749 static int tx2_uncore_pmu_add_dev(struct tx2_uncore_pmu *tx2_pmu)
 750 {
 751         int ret, cpu;
 752
 753         cpu = cpumask_any_and(cpumask_of_node(tx2_pmu->node),
 754                         cpu_online_mask);
 755
 756         tx2_pmu->cpu = cpu;
 757
 758         if (tx2_pmu->hrtimer_callback) {
 759                 hrtimer_init(&tx2_pmu->hrtimer,
 760                                 CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 761                 tx2_pmu->hrtimer.function = tx2_pmu->hrtimer_callback;
 762         }
 763
 764         ret = tx2_uncore_pmu_register(tx2_pmu);
 765         if (ret) {
 766                 dev_err(tx2_pmu->dev, "%s PMU: Failed to init driver\n",
 767                                 tx2_pmu->name);
 768                 return -ENODEV;
 769         }
 770
 771         /* register hotplug callback for the pmu */
 772         ret = cpuhp_state_add_instance(
 773                         CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
 774                         &tx2_pmu->hpnode);
 775         if (ret) {
 776                 dev_err(tx2_pmu->dev, "Error %d registering hotplug", ret);
 777                 return ret;
 778         }
 779
 780         /* Add to list */
 781         list_add(&tx2_pmu->entry, &tx2_pmus);
 782
 783         dev_dbg(tx2_pmu->dev, "%s PMU UNCORE registered\n",
 784                         tx2_pmu->pmu.name);
 785         return ret;
 786 }
 787
 788 static struct tx2_uncore_pmu *tx2_uncore_pmu_init_dev(struct device *dev,
 789                 acpi_handle handle, struct acpi_device *adev, u32 type)
 790 {
 791         struct tx2_uncore_pmu *tx2_pmu;
 792         void __iomem *base;
 793         struct resource res;
 794         struct resource_entry *rentry;
 795         struct list_head list;
 796         int ret;
 797
 798         INIT_LIST_HEAD(&list);
 799         ret = acpi_dev_get_resources(adev, &list, NULL, NULL);
 800         if (ret <= 0) {
 801                 dev_err(dev, "failed to parse _CRS method, error %d\n", ret);
 802                 return NULL;
 803         }
 804
 805         list_for_each_entry(rentry, &list, node) {
 806                 if (resource_type(rentry->res) == IORESOURCE_MEM) {
 807                         res = *rentry->res;
 808                         rentry = NULL;
 809                         break;
 810                 }
 811         }
 812         acpi_dev_free_resource_list(&list);
 813
 814         if (rentry) {
 815                 dev_err(dev, "PMU type %d: Fail to find resource\n", type);
 816                 return NULL;
 817         }
 818
 819         base = devm_ioremap_resource(dev, &res);
 820         if (IS_ERR(base))
 821                 return NULL;
 822
 823         tx2_pmu = devm_kzalloc(dev, sizeof(*tx2_pmu), GFP_KERNEL);
 824         if (!tx2_pmu)
 825                 return NULL;
 826
 827         tx2_pmu->dev = dev;
 828         tx2_pmu->type = type;
 829         tx2_pmu->base = base;
 830         tx2_pmu->node = dev_to_node(dev);
 831         INIT_LIST_HEAD(&tx2_pmu->entry);
 832
 833         switch (tx2_pmu->type) {
 834         case PMU_TYPE_L3C:
 835                 tx2_pmu->max_counters = TX2_PMU_DMC_L3C_MAX_COUNTERS;
 836                 tx2_pmu->counters_mask = 0x3;
 837                 tx2_pmu->prorate_factor = TX2_PMU_L3_TILES;
 838                 tx2_pmu->max_events = L3_EVENT_MAX;
 839                 tx2_pmu->events_mask = 0x1f;
 840                 tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
 841                 tx2_pmu->hrtimer_callback = tx2_hrtimer_callback;
 842                 tx2_pmu->attr_groups = l3c_pmu_attr_groups;
 843                 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 844                                 "uncore_l3c_%d", tx2_pmu->node);
 845                 tx2_pmu->init_cntr_base = init_cntr_base_l3c;
 846                 tx2_pmu->start_event = uncore_start_event_l3c;
 847                 tx2_pmu->stop_event = uncore_stop_event_l3c;
 848                 break;
 849         case PMU_TYPE_DMC:
 850                 tx2_pmu->max_counters = TX2_PMU_DMC_L3C_MAX_COUNTERS;
 851                 tx2_pmu->counters_mask = 0x3;
 852                 tx2_pmu->prorate_factor = TX2_PMU_DMC_CHANNELS;
 853                 tx2_pmu->max_events = DMC_EVENT_MAX;
 854                 tx2_pmu->events_mask = 0x1f;
 855                 tx2_pmu->hrtimer_interval = TX2_PMU_HRTIMER_INTERVAL;
 856                 tx2_pmu->hrtimer_callback = tx2_hrtimer_callback;
 857                 tx2_pmu->attr_groups = dmc_pmu_attr_groups;
 858                 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 859                                 "uncore_dmc_%d", tx2_pmu->node);
 860                 tx2_pmu->init_cntr_base = init_cntr_base_dmc;
 861                 tx2_pmu->start_event = uncore_start_event_dmc;
 862                 tx2_pmu->stop_event = uncore_stop_event_dmc;
 863                 break;
 864         case PMU_TYPE_CCPI2:
 865                 /* CCPI2 has 8 counters */
 866                 tx2_pmu->max_counters = TX2_PMU_CCPI2_MAX_COUNTERS;
 867                 tx2_pmu->counters_mask = 0x7;
 868                 tx2_pmu->prorate_factor = 1;
 869                 tx2_pmu->max_events = CCPI2_EVENT_MAX;
 870                 tx2_pmu->events_mask = 0x1ff;
 871                 tx2_pmu->attr_groups = ccpi2_pmu_attr_groups;
 872                 tx2_pmu->name = devm_kasprintf(dev, GFP_KERNEL,
 873                                 "uncore_ccpi2_%d", tx2_pmu->node);
 874                 tx2_pmu->init_cntr_base = init_cntr_base_ccpi2;
 875                 tx2_pmu->start_event = uncore_start_event_ccpi2;
 876                 tx2_pmu->stop_event = uncore_stop_event_ccpi2;
 877                 tx2_pmu->hrtimer_callback = NULL;
 878                 break;
 879         case PMU_TYPE_INVALID:
 880                 devm_kfree(dev, tx2_pmu);
 881                 return NULL;
 882         }
 883
 884         return tx2_pmu;
 885 }
 886
 887 static acpi_status tx2_uncore_pmu_add(acpi_handle handle, u32 level,
 888                                     void *data, void **return_value)
 889 {
 890         struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
 891         struct tx2_uncore_pmu *tx2_pmu;
 892         enum tx2_uncore_type type;
 893
 894         if (!adev || acpi_bus_get_status(adev) || !adev->status.present)
 895                 return AE_OK;
 896
 897         type = get_tx2_pmu_type(adev);
 898         if (type == PMU_TYPE_INVALID)
 899                 return AE_OK;
 900
 901         tx2_pmu = tx2_uncore_pmu_init_dev((struct device *)data,
 902                         handle, adev, type);
 903
 904         if (!tx2_pmu)
 905                 return AE_ERROR;
 906
 907         if (tx2_uncore_pmu_add_dev(tx2_pmu)) {
 908                 /* Can't add the PMU device, abort */
 909                 return AE_ERROR;
 910         }
 911         return AE_OK;
 912 }
 913
 914 static int tx2_uncore_pmu_online_cpu(unsigned int cpu,
 915                 struct hlist_node *hpnode)
 916 {
 917         struct tx2_uncore_pmu *tx2_pmu;
 918
 919         tx2_pmu = hlist_entry_safe(hpnode,
 920                         struct tx2_uncore_pmu, hpnode);
 921
 922         /* Pick this CPU, If there is no CPU/PMU association and both are
 923          * from same node.
 924          */
 925         if ((tx2_pmu->cpu >= nr_cpu_ids) &&
 926                 (tx2_pmu->node == cpu_to_node(cpu)))
 927                 tx2_pmu->cpu = cpu;
 928
 929         return 0;
 930 }
 931
 932 static int tx2_uncore_pmu_offline_cpu(unsigned int cpu,
 933                 struct hlist_node *hpnode)
 934 {
 935         int new_cpu;
 936         struct tx2_uncore_pmu *tx2_pmu;
 937         struct cpumask cpu_online_mask_temp;
 938
 939         tx2_pmu = hlist_entry_safe(hpnode,
 940                         struct tx2_uncore_pmu, hpnode);
 941
 942         if (cpu != tx2_pmu->cpu)
 943                 return 0;
 944
 945         if (tx2_pmu->hrtimer_callback)
 946                 hrtimer_cancel(&tx2_pmu->hrtimer);
 947
 948         cpumask_copy(&cpu_online_mask_temp, cpu_online_mask);
 949         cpumask_clear_cpu(cpu, &cpu_online_mask_temp);
 950         new_cpu = cpumask_any_and(
 951                         cpumask_of_node(tx2_pmu->node),
 952                         &cpu_online_mask_temp);
 953
 954         tx2_pmu->cpu = new_cpu;
 955         if (new_cpu >= nr_cpu_ids)
 956                 return 0;
 957         perf_pmu_migrate_context(&tx2_pmu->pmu, cpu, new_cpu);
 958
 959         return 0;
 960 }
 961
 962 static const struct acpi_device_id tx2_uncore_acpi_match[] = {
 963         {"CAV901C", 0},
 964         {},
 965 };
 966 MODULE_DEVICE_TABLE(acpi, tx2_uncore_acpi_match);
 967
 968 static int tx2_uncore_probe(struct platform_device *pdev)
 969 {
 970         struct device *dev = &pdev->dev;
 971         acpi_handle handle;
 972         acpi_status status;
 973
 974         set_dev_node(dev, acpi_get_node(ACPI_HANDLE(dev)));
 975
 976         if (!has_acpi_companion(dev))
 977                 return -ENODEV;
 978
 979         handle = ACPI_HANDLE(dev);
 980         if (!handle)
 981                 return -EINVAL;
 982
 983         /* Walk through the tree for all PMU UNCORE devices */
 984         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
 985                                      tx2_uncore_pmu_add,
 986                                      NULL, dev, NULL);
 987         if (ACPI_FAILURE(status)) {
 988                 dev_err(dev, "failed to probe PMU devices\n");
 989                 return_ACPI_STATUS(status);
 990         }
 991
 992         dev_info(dev, "node%d: pmu uncore registered\n", dev_to_node(dev));
 993         return 0;
 994 }
 995
 996 static int tx2_uncore_remove(struct platform_device *pdev)
 997 {
 998         struct tx2_uncore_pmu *tx2_pmu, *temp;
 999         struct device *dev = &pdev->dev;
1000
1001         if (!list_empty(&tx2_pmus)) {
1002                 list_for_each_entry_safe(tx2_pmu, temp, &tx2_pmus, entry) {
1003                         if (tx2_pmu->node == dev_to_node(dev)) {
1004                                 cpuhp_state_remove_instance_nocalls(
1005                                         CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
1006                                         &tx2_pmu->hpnode);
1007                                 perf_pmu_unregister(&tx2_pmu->pmu);
1008                                 list_del(&tx2_pmu->entry);
1009                         }
1010                 }
1011         }
1012         return 0;
1013 }
1014
1015 static struct platform_driver tx2_uncore_driver = {
1016         .driver = {
1017                 .name           = "tx2-uncore-pmu",
1018                 .acpi_match_table = ACPI_PTR(tx2_uncore_acpi_match),
1019                 .suppress_bind_attrs = true,
1020         },
1021         .probe = tx2_uncore_probe,
1022         .remove = tx2_uncore_remove,
1023 };
1024
1025 static int __init tx2_uncore_driver_init(void)
1026 {
1027         int ret;
1028
1029         ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
1030                                       "perf/tx2/uncore:online",
1031                                       tx2_uncore_pmu_online_cpu,
1032                                       tx2_uncore_pmu_offline_cpu);
1033         if (ret) {
1034                 pr_err("TX2 PMU: setup hotplug failed(%d)\n", ret);
1035                 return ret;
1036         }
1037         ret = platform_driver_register(&tx2_uncore_driver);
1038         if (ret)
1039                 cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
1040
1041         return ret;
1042 }
1043 module_init(tx2_uncore_driver_init);
1044
1045 static void __exit tx2_uncore_driver_exit(void)
1046 {
1047         platform_driver_unregister(&tx2_uncore_driver);
1048         cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE);
1049 }
1050 module_exit(tx2_uncore_driver_exit);
1051
1052 MODULE_DESCRIPTION("ThunderX2 UNCORE PMU driver");
1053 MODULE_LICENSE("GPL v2");
1054 MODULE_AUTHOR("Ganapatrao Kulkarni <gkulkarni@cavium.com>");