drivers/perf/apple_m1_cpu_pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * CPU PMU driver for the Apple M1 and derivatives
   4  *
   5  * Copyright (C) 2021 Google LLC
   6  *
   7  * Author: Marc Zyngier <maz@kernel.org>
   8  *
   9  * Most of the information used in this driver was provided by the
  10  * Asahi Linux project. The rest was experimentally discovered.
  11  */
  12
  13 #include <linux/of.h>
  14 #include <linux/perf/arm_pmu.h>
  15 #include <linux/platform_device.h>
  16
  17 #include <asm/apple_m1_pmu.h>
  18 #include <asm/irq_regs.h>
  19 #include <asm/perf_event.h>
  20
  21 #define M1_PMU_NR_COUNTERS              10
  22
  23 #define M1_PMU_CFG_EVENT                GENMASK(7, 0)
  24
  25 #define ANY_BUT_0_1                     GENMASK(9, 2)
  26 #define ONLY_2_TO_7                     GENMASK(7, 2)
  27 #define ONLY_2_4_6                      (BIT(2) | BIT(4) | BIT(6))
  28 #define ONLY_5_6_7                      (BIT(5) | BIT(6) | BIT(7))
  29
  30 /*
  31  * Description of the events we actually know about, as well as those with
  32  * a specific counter affinity. Yes, this is a grand total of two known
  33  * counters, and the rest is anybody's guess.
  34  *
  35  * Not all counters can count all events. Counters #0 and #1 are wired to
  36  * count cycles and instructions respectively, and some events have
  37  * bizarre mappings (every other counter, or even *one* counter). These
  38  * restrictions equally apply to both P and E cores.
  39  *
  40  * It is worth noting that the PMUs attached to P and E cores are likely
  41  * to be different because the underlying uarches are different. At the
  42  * moment, we don't really need to distinguish between the two because we
  43  * know next to nothing about the events themselves, and we already have
  44  * per cpu-type PMU abstractions.
  45  *
  46  * If we eventually find out that the events are different across
  47  * implementations, we'll have to introduce per cpu-type tables.
  48  */
  49 enum m1_pmu_events {
  50         M1_PMU_PERFCTR_UNKNOWN_01       = 0x01,
  51         M1_PMU_PERFCTR_CPU_CYCLES       = 0x02,
  52         M1_PMU_PERFCTR_INSTRUCTIONS     = 0x8c,
  53         M1_PMU_PERFCTR_UNKNOWN_8d       = 0x8d,
  54         M1_PMU_PERFCTR_UNKNOWN_8e       = 0x8e,
  55         M1_PMU_PERFCTR_UNKNOWN_8f       = 0x8f,
  56         M1_PMU_PERFCTR_UNKNOWN_90       = 0x90,
  57         M1_PMU_PERFCTR_UNKNOWN_93       = 0x93,
  58         M1_PMU_PERFCTR_UNKNOWN_94       = 0x94,
  59         M1_PMU_PERFCTR_UNKNOWN_95       = 0x95,
  60         M1_PMU_PERFCTR_UNKNOWN_96       = 0x96,
  61         M1_PMU_PERFCTR_UNKNOWN_97       = 0x97,
  62         M1_PMU_PERFCTR_UNKNOWN_98       = 0x98,
  63         M1_PMU_PERFCTR_UNKNOWN_99       = 0x99,
  64         M1_PMU_PERFCTR_UNKNOWN_9a       = 0x9a,
  65         M1_PMU_PERFCTR_UNKNOWN_9b       = 0x9b,
  66         M1_PMU_PERFCTR_UNKNOWN_9c       = 0x9c,
  67         M1_PMU_PERFCTR_UNKNOWN_9f       = 0x9f,
  68         M1_PMU_PERFCTR_UNKNOWN_bf       = 0xbf,
  69         M1_PMU_PERFCTR_UNKNOWN_c0       = 0xc0,
  70         M1_PMU_PERFCTR_UNKNOWN_c1       = 0xc1,
  71         M1_PMU_PERFCTR_UNKNOWN_c4       = 0xc4,
  72         M1_PMU_PERFCTR_UNKNOWN_c5       = 0xc5,
  73         M1_PMU_PERFCTR_UNKNOWN_c6       = 0xc6,
  74         M1_PMU_PERFCTR_UNKNOWN_c8       = 0xc8,
  75         M1_PMU_PERFCTR_UNKNOWN_ca       = 0xca,
  76         M1_PMU_PERFCTR_UNKNOWN_cb       = 0xcb,
  77         M1_PMU_PERFCTR_UNKNOWN_f5       = 0xf5,
  78         M1_PMU_PERFCTR_UNKNOWN_f6       = 0xf6,
  79         M1_PMU_PERFCTR_UNKNOWN_f7       = 0xf7,
  80         M1_PMU_PERFCTR_UNKNOWN_f8       = 0xf8,
  81         M1_PMU_PERFCTR_UNKNOWN_fd       = 0xfd,
  82         M1_PMU_PERFCTR_LAST             = M1_PMU_CFG_EVENT,
  83
  84         /*
  85          * From this point onwards, these are not actual HW events,
  86          * but attributes that get stored in hw->config_base.
  87          */
  88         M1_PMU_CFG_COUNT_USER           = BIT(8),
  89         M1_PMU_CFG_COUNT_KERNEL         = BIT(9),
  90 };
  91
  92 /*
  93  * Per-event affinity table. Most events can be installed on counter
  94  * 2-9, but there are a number of exceptions. Note that this table
  95  * has been created experimentally, and I wouldn't be surprised if more
  96  * counters had strange affinities.
  97  */
  98 static const u16 m1_pmu_event_affinity[M1_PMU_PERFCTR_LAST + 1] = {
  99         [0 ... M1_PMU_PERFCTR_LAST]     = ANY_BUT_0_1,
 100         [M1_PMU_PERFCTR_UNKNOWN_01]     = BIT(7),
 101         [M1_PMU_PERFCTR_CPU_CYCLES]     = ANY_BUT_0_1 | BIT(0),
 102         [M1_PMU_PERFCTR_INSTRUCTIONS]   = BIT(7) | BIT(1),
 103         [M1_PMU_PERFCTR_UNKNOWN_8d]     = ONLY_5_6_7,
 104         [M1_PMU_PERFCTR_UNKNOWN_8e]     = ONLY_5_6_7,
 105         [M1_PMU_PERFCTR_UNKNOWN_8f]     = ONLY_5_6_7,
 106         [M1_PMU_PERFCTR_UNKNOWN_90]     = ONLY_5_6_7,
 107         [M1_PMU_PERFCTR_UNKNOWN_93]     = ONLY_5_6_7,
 108         [M1_PMU_PERFCTR_UNKNOWN_94]     = ONLY_5_6_7,
 109         [M1_PMU_PERFCTR_UNKNOWN_95]     = ONLY_5_6_7,
 110         [M1_PMU_PERFCTR_UNKNOWN_96]     = ONLY_5_6_7,
 111         [M1_PMU_PERFCTR_UNKNOWN_97]     = BIT(7),
 112         [M1_PMU_PERFCTR_UNKNOWN_98]     = ONLY_5_6_7,
 113         [M1_PMU_PERFCTR_UNKNOWN_99]     = ONLY_5_6_7,
 114         [M1_PMU_PERFCTR_UNKNOWN_9a]     = BIT(7),
 115         [M1_PMU_PERFCTR_UNKNOWN_9b]     = ONLY_5_6_7,
 116         [M1_PMU_PERFCTR_UNKNOWN_9c]     = ONLY_5_6_7,
 117         [M1_PMU_PERFCTR_UNKNOWN_9f]     = BIT(7),
 118         [M1_PMU_PERFCTR_UNKNOWN_bf]     = ONLY_5_6_7,
 119         [M1_PMU_PERFCTR_UNKNOWN_c0]     = ONLY_5_6_7,
 120         [M1_PMU_PERFCTR_UNKNOWN_c1]     = ONLY_5_6_7,
 121         [M1_PMU_PERFCTR_UNKNOWN_c4]     = ONLY_5_6_7,
 122         [M1_PMU_PERFCTR_UNKNOWN_c5]     = ONLY_5_6_7,
 123         [M1_PMU_PERFCTR_UNKNOWN_c6]     = ONLY_5_6_7,
 124         [M1_PMU_PERFCTR_UNKNOWN_c8]     = ONLY_5_6_7,
 125         [M1_PMU_PERFCTR_UNKNOWN_ca]     = ONLY_5_6_7,
 126         [M1_PMU_PERFCTR_UNKNOWN_cb]     = ONLY_5_6_7,
 127         [M1_PMU_PERFCTR_UNKNOWN_f5]     = ONLY_2_4_6,
 128         [M1_PMU_PERFCTR_UNKNOWN_f6]     = ONLY_2_4_6,
 129         [M1_PMU_PERFCTR_UNKNOWN_f7]     = ONLY_2_4_6,
 130         [M1_PMU_PERFCTR_UNKNOWN_f8]     = ONLY_2_TO_7,
 131         [M1_PMU_PERFCTR_UNKNOWN_fd]     = ONLY_2_4_6,
 132 };
 133
 134 static const unsigned m1_pmu_perf_map[PERF_COUNT_HW_MAX] = {
 135         PERF_MAP_ALL_UNSUPPORTED,
 136         [PERF_COUNT_HW_CPU_CYCLES]      = M1_PMU_PERFCTR_CPU_CYCLES,
 137         [PERF_COUNT_HW_INSTRUCTIONS]    = M1_PMU_PERFCTR_INSTRUCTIONS,
 138         /* No idea about the rest yet */
 139 };
 140
 141 /* sysfs definitions */
 142 static ssize_t m1_pmu_events_sysfs_show(struct device *dev,
 143                                         struct device_attribute *attr,
 144                                         char *page)
 145 {
 146         struct perf_pmu_events_attr *pmu_attr;
 147
 148         pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
 149
 150         return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
 151 }
 152
 153 #define M1_PMU_EVENT_ATTR(name, config)                                 \
 154         PMU_EVENT_ATTR_ID(name, m1_pmu_events_sysfs_show, config)
 155
 156 static struct attribute *m1_pmu_event_attrs[] = {
 157         M1_PMU_EVENT_ATTR(cycles, M1_PMU_PERFCTR_CPU_CYCLES),
 158         M1_PMU_EVENT_ATTR(instructions, M1_PMU_PERFCTR_INSTRUCTIONS),
 159         NULL,
 160 };
 161
 162 static const struct attribute_group m1_pmu_events_attr_group = {
 163         .name = "events",
 164         .attrs = m1_pmu_event_attrs,
 165 };
 166
 167 PMU_FORMAT_ATTR(event, "config:0-7");
 168
 169 static struct attribute *m1_pmu_format_attrs[] = {
 170         &format_attr_event.attr,
 171         NULL,
 172 };
 173
 174 static const struct attribute_group m1_pmu_format_attr_group = {
 175         .name = "format",
 176         .attrs = m1_pmu_format_attrs,
 177 };
 178
 179 /* Low level accessors. No synchronisation. */
 180 #define PMU_READ_COUNTER(_idx)                                          \
 181         case _idx:      return read_sysreg_s(SYS_IMP_APL_PMC## _idx ##_EL1)
 182
 183 #define PMU_WRITE_COUNTER(_val, _idx)                                   \
 184         case _idx:                                                      \
 185                 write_sysreg_s(_val, SYS_IMP_APL_PMC## _idx ##_EL1);    \
 186                 return
 187
 188 static u64 m1_pmu_read_hw_counter(unsigned int index)
 189 {
 190         switch (index) {
 191                 PMU_READ_COUNTER(0);
 192                 PMU_READ_COUNTER(1);
 193                 PMU_READ_COUNTER(2);
 194                 PMU_READ_COUNTER(3);
 195                 PMU_READ_COUNTER(4);
 196                 PMU_READ_COUNTER(5);
 197                 PMU_READ_COUNTER(6);
 198                 PMU_READ_COUNTER(7);
 199                 PMU_READ_COUNTER(8);
 200                 PMU_READ_COUNTER(9);
 201         }
 202
 203         BUG();
 204 }
 205
 206 static void m1_pmu_write_hw_counter(u64 val, unsigned int index)
 207 {
 208         switch (index) {
 209                 PMU_WRITE_COUNTER(val, 0);
 210                 PMU_WRITE_COUNTER(val, 1);
 211                 PMU_WRITE_COUNTER(val, 2);
 212                 PMU_WRITE_COUNTER(val, 3);
 213                 PMU_WRITE_COUNTER(val, 4);
 214                 PMU_WRITE_COUNTER(val, 5);
 215                 PMU_WRITE_COUNTER(val, 6);
 216                 PMU_WRITE_COUNTER(val, 7);
 217                 PMU_WRITE_COUNTER(val, 8);
 218                 PMU_WRITE_COUNTER(val, 9);
 219         }
 220
 221         BUG();
 222 }
 223
 224 #define get_bit_offset(index, mask)     (__ffs(mask) + (index))
 225
 226 static void __m1_pmu_enable_counter(unsigned int index, bool en)
 227 {
 228         u64 val, bit;
 229
 230         switch (index) {
 231         case 0 ... 7:
 232                 bit = BIT(get_bit_offset(index, PMCR0_CNT_ENABLE_0_7));
 233                 break;
 234         case 8 ... 9:
 235                 bit = BIT(get_bit_offset(index - 8, PMCR0_CNT_ENABLE_8_9));
 236                 break;
 237         default:
 238                 BUG();
 239         }
 240
 241         val = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
 242
 243         if (en)
 244                 val |= bit;
 245         else
 246                 val &= ~bit;
 247
 248         write_sysreg_s(val, SYS_IMP_APL_PMCR0_EL1);
 249 }
 250
 251 static void m1_pmu_enable_counter(unsigned int index)
 252 {
 253         __m1_pmu_enable_counter(index, true);
 254 }
 255
 256 static void m1_pmu_disable_counter(unsigned int index)
 257 {
 258         __m1_pmu_enable_counter(index, false);
 259 }
 260
 261 static void __m1_pmu_enable_counter_interrupt(unsigned int index, bool en)
 262 {
 263         u64 val, bit;
 264
 265         switch (index) {
 266         case 0 ... 7:
 267                 bit = BIT(get_bit_offset(index, PMCR0_PMI_ENABLE_0_7));
 268                 break;
 269         case 8 ... 9:
 270                 bit = BIT(get_bit_offset(index - 8, PMCR0_PMI_ENABLE_8_9));
 271                 break;
 272         default:
 273                 BUG();
 274         }
 275
 276         val = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
 277
 278         if (en)
 279                 val |= bit;
 280         else
 281                 val &= ~bit;
 282
 283         write_sysreg_s(val, SYS_IMP_APL_PMCR0_EL1);
 284 }
 285
 286 static void m1_pmu_enable_counter_interrupt(unsigned int index)
 287 {
 288         __m1_pmu_enable_counter_interrupt(index, true);
 289 }
 290
 291 static void m1_pmu_disable_counter_interrupt(unsigned int index)
 292 {
 293         __m1_pmu_enable_counter_interrupt(index, false);
 294 }
 295
 296 static void m1_pmu_configure_counter(unsigned int index, u8 event,
 297                                      bool user, bool kernel)
 298 {
 299         u64 val, user_bit, kernel_bit;
 300         int shift;
 301
 302         switch (index) {
 303         case 0 ... 7:
 304                 user_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL0_0_7));
 305                 kernel_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL1_0_7));
 306                 break;
 307         case 8 ... 9:
 308                 user_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL0_8_9));
 309                 kernel_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL1_8_9));
 310                 break;
 311         default:
 312                 BUG();
 313         }
 314
 315         val = read_sysreg_s(SYS_IMP_APL_PMCR1_EL1);
 316
 317         if (user)
 318                 val |= user_bit;
 319         else
 320                 val &= ~user_bit;
 321
 322         if (kernel)
 323                 val |= kernel_bit;
 324         else
 325                 val &= ~kernel_bit;
 326
 327         write_sysreg_s(val, SYS_IMP_APL_PMCR1_EL1);
 328
 329         /*
 330          * Counters 0 and 1 have fixed events. For anything else,
 331          * place the event at the expected location in the relevant
 332          * register (PMESR0 holds the event configuration for counters
 333          * 2-5, resp. PMESR1 for counters 6-9).
 334          */
 335         switch (index) {
 336         case 0 ... 1:
 337                 break;
 338         case 2 ... 5:
 339                 shift = (index - 2) * 8;
 340                 val = read_sysreg_s(SYS_IMP_APL_PMESR0_EL1);
 341                 val &= ~((u64)0xff << shift);
 342                 val |= (u64)event << shift;
 343                 write_sysreg_s(val, SYS_IMP_APL_PMESR0_EL1);
 344                 break;
 345         case 6 ... 9:
 346                 shift = (index - 6) * 8;
 347                 val = read_sysreg_s(SYS_IMP_APL_PMESR1_EL1);
 348                 val &= ~((u64)0xff << shift);
 349                 val |= (u64)event << shift;
 350                 write_sysreg_s(val, SYS_IMP_APL_PMESR1_EL1);
 351                 break;
 352         }
 353 }
 354
 355 /* arm_pmu backend */
 356 static void m1_pmu_enable_event(struct perf_event *event)
 357 {
 358         bool user, kernel;
 359         u8 evt;
 360
 361         evt = event->hw.config_base & M1_PMU_CFG_EVENT;
 362         user = event->hw.config_base & M1_PMU_CFG_COUNT_USER;
 363         kernel = event->hw.config_base & M1_PMU_CFG_COUNT_KERNEL;
 364
 365         m1_pmu_disable_counter_interrupt(event->hw.idx);
 366         m1_pmu_disable_counter(event->hw.idx);
 367         isb();
 368
 369         m1_pmu_configure_counter(event->hw.idx, evt, user, kernel);
 370         m1_pmu_enable_counter(event->hw.idx);
 371         m1_pmu_enable_counter_interrupt(event->hw.idx);
 372         isb();
 373 }
 374
 375 static void m1_pmu_disable_event(struct perf_event *event)
 376 {
 377         m1_pmu_disable_counter_interrupt(event->hw.idx);
 378         m1_pmu_disable_counter(event->hw.idx);
 379         isb();
 380 }
 381
 382 static irqreturn_t m1_pmu_handle_irq(struct arm_pmu *cpu_pmu)
 383 {
 384         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 385         struct pt_regs *regs;
 386         u64 overflow, state;
 387         int idx;
 388
 389         overflow = read_sysreg_s(SYS_IMP_APL_PMSR_EL1);
 390         if (!overflow) {
 391                 /* Spurious interrupt? */
 392                 state = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
 393                 state &= ~PMCR0_IACT;
 394                 write_sysreg_s(state, SYS_IMP_APL_PMCR0_EL1);
 395                 isb();
 396                 return IRQ_NONE;
 397         }
 398
 399         cpu_pmu->stop(cpu_pmu);
 400
 401         regs = get_irq_regs();
 402
 403         for (idx = 0; idx < cpu_pmu->num_events; idx++) {
 404                 struct perf_event *event = cpuc->events[idx];
 405                 struct perf_sample_data data;
 406
 407                 if (!event)
 408                         continue;
 409
 410                 armpmu_event_update(event);
 411                 perf_sample_data_init(&data, 0, event->hw.last_period);
 412                 if (!armpmu_event_set_period(event))
 413                         continue;
 414
 415                 if (perf_event_overflow(event, &data, regs))
 416                         m1_pmu_disable_event(event);
 417         }
 418
 419         cpu_pmu->start(cpu_pmu);
 420
 421         return IRQ_HANDLED;
 422 }
 423
 424 static u64 m1_pmu_read_counter(struct perf_event *event)
 425 {
 426         return m1_pmu_read_hw_counter(event->hw.idx);
 427 }
 428
 429 static void m1_pmu_write_counter(struct perf_event *event, u64 value)
 430 {
 431         m1_pmu_write_hw_counter(value, event->hw.idx);
 432         isb();
 433 }
 434
 435 static int m1_pmu_get_event_idx(struct pmu_hw_events *cpuc,
 436                                 struct perf_event *event)
 437 {
 438         unsigned long evtype = event->hw.config_base & M1_PMU_CFG_EVENT;
 439         unsigned long affinity = m1_pmu_event_affinity[evtype];
 440         int idx;
 441
 442         /*
 443          * Place the event on the first free counter that can count
 444          * this event.
 445          *
 446          * We could do a better job if we had a view of all the events
 447          * counting on the PMU at any given time, and by placing the
 448          * most constraining events first.
 449          */
 450         for_each_set_bit(idx, &affinity, M1_PMU_NR_COUNTERS) {
 451                 if (!test_and_set_bit(idx, cpuc->used_mask))
 452                         return idx;
 453         }
 454
 455         return -EAGAIN;
 456 }
 457
 458 static void m1_pmu_clear_event_idx(struct pmu_hw_events *cpuc,
 459                                    struct perf_event *event)
 460 {
 461         clear_bit(event->hw.idx, cpuc->used_mask);
 462 }
 463
 464 static void __m1_pmu_set_mode(u8 mode)
 465 {
 466         u64 val;
 467
 468         val = read_sysreg_s(SYS_IMP_APL_PMCR0_EL1);
 469         val &= ~(PMCR0_IMODE | PMCR0_IACT);
 470         val |= FIELD_PREP(PMCR0_IMODE, mode);
 471         write_sysreg_s(val, SYS_IMP_APL_PMCR0_EL1);
 472         isb();
 473 }
 474
 475 static void m1_pmu_start(struct arm_pmu *cpu_pmu)
 476 {
 477         __m1_pmu_set_mode(PMCR0_IMODE_FIQ);
 478 }
 479
 480 static void m1_pmu_stop(struct arm_pmu *cpu_pmu)
 481 {
 482         __m1_pmu_set_mode(PMCR0_IMODE_OFF);
 483 }
 484
 485 static int m1_pmu_map_event(struct perf_event *event)
 486 {
 487         /*
 488          * Although the counters are 48bit wide, bit 47 is what
 489          * triggers the overflow interrupt. Advertise the counters
 490          * being 47bit wide to mimick the behaviour of the ARM PMU.
 491          */
 492         event->hw.flags |= ARMPMU_EVT_47BIT;
 493         return armpmu_map_event(event, &m1_pmu_perf_map, NULL, M1_PMU_CFG_EVENT);
 494 }
 495
 496 static void m1_pmu_reset(void *info)
 497 {
 498         int i;
 499
 500         __m1_pmu_set_mode(PMCR0_IMODE_OFF);
 501
 502         for (i = 0; i < M1_PMU_NR_COUNTERS; i++) {
 503                 m1_pmu_disable_counter(i);
 504                 m1_pmu_disable_counter_interrupt(i);
 505                 m1_pmu_write_hw_counter(0, i);
 506         }
 507
 508         isb();
 509 }
 510
 511 static int m1_pmu_set_event_filter(struct hw_perf_event *event,
 512                                    struct perf_event_attr *attr)
 513 {
 514         unsigned long config_base = 0;
 515
 516         if (!attr->exclude_guest)
 517                 return -EINVAL;
 518         if (!attr->exclude_kernel)
 519                 config_base |= M1_PMU_CFG_COUNT_KERNEL;
 520         if (!attr->exclude_user)
 521                 config_base |= M1_PMU_CFG_COUNT_USER;
 522
 523         event->config_base = config_base;
 524
 525         return 0;
 526 }
 527
 528 static int m1_pmu_init(struct arm_pmu *cpu_pmu)
 529 {
 530         cpu_pmu->handle_irq       = m1_pmu_handle_irq;
 531         cpu_pmu->enable           = m1_pmu_enable_event;
 532         cpu_pmu->disable          = m1_pmu_disable_event;
 533         cpu_pmu->read_counter     = m1_pmu_read_counter;
 534         cpu_pmu->write_counter    = m1_pmu_write_counter;
 535         cpu_pmu->get_event_idx    = m1_pmu_get_event_idx;
 536         cpu_pmu->clear_event_idx  = m1_pmu_clear_event_idx;
 537         cpu_pmu->start            = m1_pmu_start;
 538         cpu_pmu->stop             = m1_pmu_stop;
 539         cpu_pmu->map_event        = m1_pmu_map_event;
 540         cpu_pmu->reset            = m1_pmu_reset;
 541         cpu_pmu->set_event_filter = m1_pmu_set_event_filter;
 542
 543         cpu_pmu->num_events       = M1_PMU_NR_COUNTERS;
 544         cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] = &m1_pmu_events_attr_group;
 545         cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] = &m1_pmu_format_attr_group;
 546         return 0;
 547 }
 548
 549 /* Device driver gunk */
 550 static int m1_pmu_ice_init(struct arm_pmu *cpu_pmu)
 551 {
 552         cpu_pmu->name = "apple_icestorm_pmu";
 553         return m1_pmu_init(cpu_pmu);
 554 }
 555
 556 static int m1_pmu_fire_init(struct arm_pmu *cpu_pmu)
 557 {
 558         cpu_pmu->name = "apple_firestorm_pmu";
 559         return m1_pmu_init(cpu_pmu);
 560 }
 561
 562 static const struct of_device_id m1_pmu_of_device_ids[] = {
 563         { .compatible = "apple,icestorm-pmu",   .data = m1_pmu_ice_init, },
 564         { .compatible = "apple,firestorm-pmu",  .data = m1_pmu_fire_init, },
 565         { },
 566 };
 567 MODULE_DEVICE_TABLE(of, m1_pmu_of_device_ids);
 568
 569 static int m1_pmu_device_probe(struct platform_device *pdev)
 570 {
 571         return arm_pmu_device_probe(pdev, m1_pmu_of_device_ids, NULL);
 572 }
 573
 574 static struct platform_driver m1_pmu_driver = {
 575         .driver         = {
 576                 .name                   = "apple-m1-cpu-pmu",
 577                 .of_match_table         = m1_pmu_of_device_ids,
 578                 .suppress_bind_attrs    = true,
 579         },
 580         .probe          = m1_pmu_device_probe,
 581 };
 582
 583 module_platform_driver(m1_pmu_driver);
 584 MODULE_LICENSE("GPL v2");