1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/perf_event.h> 3 #include <linux/export.h> 4 #include <linux/types.h> 5 #include <linux/init.h> 6 #include <linux/slab.h> 7 #include <linux/delay.h> 8 #include <linux/jiffies.h> 9 #include <asm/apicdef.h> 10 #include <asm/nmi.h> 11 12 #include "../perf_event.h" 13 14 static DEFINE_PER_CPU(unsigned long, perf_nmi_tstamp); 15 static unsigned long perf_nmi_window; 16 17 /* AMD Event 0xFFF: Merge. Used with Large Increment per Cycle events */ 18 #define AMD_MERGE_EVENT ((0xFULL << 32) | 0xFFULL) 19 #define AMD_MERGE_EVENT_ENABLE (AMD_MERGE_EVENT | ARCH_PERFMON_EVENTSEL_ENABLE) 20 21 static __initconst const u64 amd_hw_cache_event_ids 22 [PERF_COUNT_HW_CACHE_MAX] 23 [PERF_COUNT_HW_CACHE_OP_MAX] 24 [PERF_COUNT_HW_CACHE_RESULT_MAX] = 25 { 26 [ C(L1D) ] = { 27 [ C(OP_READ) ] = { 28 [ C(RESULT_ACCESS) ] = 0x0040, /* Data Cache Accesses */ 29 [ C(RESULT_MISS) ] = 0x0141, /* Data Cache Misses */ 30 }, 31 [ C(OP_WRITE) ] = { 32 [ C(RESULT_ACCESS) ] = 0, 33 [ C(RESULT_MISS) ] = 0, 34 }, 35 [ C(OP_PREFETCH) ] = { 36 [ C(RESULT_ACCESS) ] = 0x0267, /* Data Prefetcher :attempts */ 37 [ C(RESULT_MISS) ] = 0x0167, /* Data Prefetcher :cancelled */ 38 }, 39 }, 40 [ C(L1I ) ] = { 41 [ C(OP_READ) ] = { 42 [ C(RESULT_ACCESS) ] = 0x0080, /* Instruction cache fetches */ 43 [ C(RESULT_MISS) ] = 0x0081, /* Instruction cache misses */ 44 }, 45 [ C(OP_WRITE) ] = { 46 [ C(RESULT_ACCESS) ] = -1, 47 [ C(RESULT_MISS) ] = -1, 48 }, 49 [ C(OP_PREFETCH) ] = { 50 [ C(RESULT_ACCESS) ] = 0x014B, /* Prefetch Instructions :Load */ 51 [ C(RESULT_MISS) ] = 0, 52 }, 53 }, 54 [ C(LL ) ] = { 55 [ C(OP_READ) ] = { 56 [ C(RESULT_ACCESS) ] = 0x037D, /* Requests to L2 Cache :IC+DC */ 57 [ C(RESULT_MISS) ] = 0x037E, /* L2 Cache Misses : IC+DC */ 58 }, 59 [ C(OP_WRITE) ] = { 60 [ C(RESULT_ACCESS) ] = 0x017F, /* L2 Fill/Writeback */ 61 [ C(RESULT_MISS) ] = 0, 62 }, 63 [ C(OP_PREFETCH) ] = { 64 [ C(RESULT_ACCESS) ] = 0, 65 [ C(RESULT_MISS) ] = 0, 66 }, 67 }, 68 [ C(DTLB) ] = { 69 [ C(OP_READ) ] = { 70 [ C(RESULT_ACCESS) ] = 0x0040, /* Data Cache Accesses */ 71 [ C(RESULT_MISS) ] = 0x0746, /* L1_DTLB_AND_L2_DLTB_MISS.ALL */ 72 }, 73 [ C(OP_WRITE) ] = { 74 [ C(RESULT_ACCESS) ] = 0, 75 [ C(RESULT_MISS) ] = 0, 76 }, 77 [ C(OP_PREFETCH) ] = { 78 [ C(RESULT_ACCESS) ] = 0, 79 [ C(RESULT_MISS) ] = 0, 80 }, 81 }, 82 [ C(ITLB) ] = { 83 [ C(OP_READ) ] = { 84 [ C(RESULT_ACCESS) ] = 0x0080, /* Instruction fecthes */ 85 [ C(RESULT_MISS) ] = 0x0385, /* L1_ITLB_AND_L2_ITLB_MISS.ALL */ 86 }, 87 [ C(OP_WRITE) ] = { 88 [ C(RESULT_ACCESS) ] = -1, 89 [ C(RESULT_MISS) ] = -1, 90 }, 91 [ C(OP_PREFETCH) ] = { 92 [ C(RESULT_ACCESS) ] = -1, 93 [ C(RESULT_MISS) ] = -1, 94 }, 95 }, 96 [ C(BPU ) ] = { 97 [ C(OP_READ) ] = { 98 [ C(RESULT_ACCESS) ] = 0x00c2, /* Retired Branch Instr. */ 99 [ C(RESULT_MISS) ] = 0x00c3, /* Retired Mispredicted BI */ 100 }, 101 [ C(OP_WRITE) ] = { 102 [ C(RESULT_ACCESS) ] = -1, 103 [ C(RESULT_MISS) ] = -1, 104 }, 105 [ C(OP_PREFETCH) ] = { 106 [ C(RESULT_ACCESS) ] = -1, 107 [ C(RESULT_MISS) ] = -1, 108 }, 109 }, 110 [ C(NODE) ] = { 111 [ C(OP_READ) ] = { 112 [ C(RESULT_ACCESS) ] = 0xb8e9, /* CPU Request to Memory, l+r */ 113 [ C(RESULT_MISS) ] = 0x98e9, /* CPU Request to Memory, r */ 114 }, 115 [ C(OP_WRITE) ] = { 116 [ C(RESULT_ACCESS) ] = -1, 117 [ C(RESULT_MISS) ] = -1, 118 }, 119 [ C(OP_PREFETCH) ] = { 120 [ C(RESULT_ACCESS) ] = -1, 121 [ C(RESULT_MISS) ] = -1, 122 }, 123 }, 124 }; 125 126 static __initconst const u64 amd_hw_cache_event_ids_f17h 127 [PERF_COUNT_HW_CACHE_MAX] 128 [PERF_COUNT_HW_CACHE_OP_MAX] 129 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 130 [C(L1D)] = { 131 [C(OP_READ)] = { 132 [C(RESULT_ACCESS)] = 0x0040, /* Data Cache Accesses */ 133 [C(RESULT_MISS)] = 0xc860, /* L2$ access from DC Miss */ 134 }, 135 [C(OP_WRITE)] = { 136 [C(RESULT_ACCESS)] = 0, 137 [C(RESULT_MISS)] = 0, 138 }, 139 [C(OP_PREFETCH)] = { 140 [C(RESULT_ACCESS)] = 0xff5a, /* h/w prefetch DC Fills */ 141 [C(RESULT_MISS)] = 0, 142 }, 143 }, 144 [C(L1I)] = { 145 [C(OP_READ)] = { 146 [C(RESULT_ACCESS)] = 0x0080, /* Instruction cache fetches */ 147 [C(RESULT_MISS)] = 0x0081, /* Instruction cache misses */ 148 }, 149 [C(OP_WRITE)] = { 150 [C(RESULT_ACCESS)] = -1, 151 [C(RESULT_MISS)] = -1, 152 }, 153 [C(OP_PREFETCH)] = { 154 [C(RESULT_ACCESS)] = 0, 155 [C(RESULT_MISS)] = 0, 156 }, 157 }, 158 [C(LL)] = { 159 [C(OP_READ)] = { 160 [C(RESULT_ACCESS)] = 0, 161 [C(RESULT_MISS)] = 0, 162 }, 163 [C(OP_WRITE)] = { 164 [C(RESULT_ACCESS)] = 0, 165 [C(RESULT_MISS)] = 0, 166 }, 167 [C(OP_PREFETCH)] = { 168 [C(RESULT_ACCESS)] = 0, 169 [C(RESULT_MISS)] = 0, 170 }, 171 }, 172 [C(DTLB)] = { 173 [C(OP_READ)] = { 174 [C(RESULT_ACCESS)] = 0xff45, /* All L2 DTLB accesses */ 175 [C(RESULT_MISS)] = 0xf045, /* L2 DTLB misses (PT walks) */ 176 }, 177 [C(OP_WRITE)] = { 178 [C(RESULT_ACCESS)] = 0, 179 [C(RESULT_MISS)] = 0, 180 }, 181 [C(OP_PREFETCH)] = { 182 [C(RESULT_ACCESS)] = 0, 183 [C(RESULT_MISS)] = 0, 184 }, 185 }, 186 [C(ITLB)] = { 187 [C(OP_READ)] = { 188 [C(RESULT_ACCESS)] = 0x0084, /* L1 ITLB misses, L2 ITLB hits */ 189 [C(RESULT_MISS)] = 0xff85, /* L1 ITLB misses, L2 misses */ 190 }, 191 [C(OP_WRITE)] = { 192 [C(RESULT_ACCESS)] = -1, 193 [C(RESULT_MISS)] = -1, 194 }, 195 [C(OP_PREFETCH)] = { 196 [C(RESULT_ACCESS)] = -1, 197 [C(RESULT_MISS)] = -1, 198 }, 199 }, 200 [C(BPU)] = { 201 [C(OP_READ)] = { 202 [C(RESULT_ACCESS)] = 0x00c2, /* Retired Branch Instr. */ 203 [C(RESULT_MISS)] = 0x00c3, /* Retired Mispredicted BI */ 204 }, 205 [C(OP_WRITE)] = { 206 [C(RESULT_ACCESS)] = -1, 207 [C(RESULT_MISS)] = -1, 208 }, 209 [C(OP_PREFETCH)] = { 210 [C(RESULT_ACCESS)] = -1, 211 [C(RESULT_MISS)] = -1, 212 }, 213 }, 214 [C(NODE)] = { 215 [C(OP_READ)] = { 216 [C(RESULT_ACCESS)] = 0, 217 [C(RESULT_MISS)] = 0, 218 }, 219 [C(OP_WRITE)] = { 220 [C(RESULT_ACCESS)] = -1, 221 [C(RESULT_MISS)] = -1, 222 }, 223 [C(OP_PREFETCH)] = { 224 [C(RESULT_ACCESS)] = -1, 225 [C(RESULT_MISS)] = -1, 226 }, 227 }, 228 }; 229 230 /* 231 * AMD Performance Monitor K7 and later, up to and including Family 16h: 232 */ 233 static const u64 amd_perfmon_event_map[PERF_COUNT_HW_MAX] = 234 { 235 [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, 236 [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, 237 [PERF_COUNT_HW_CACHE_REFERENCES] = 0x077d, 238 [PERF_COUNT_HW_CACHE_MISSES] = 0x077e, 239 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, 240 [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, 241 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x00d0, /* "Decoder empty" event */ 242 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x00d1, /* "Dispatch stalls" event */ 243 }; 244 245 /* 246 * AMD Performance Monitor Family 17h and later: 247 */ 248 static const u64 amd_f17h_perfmon_event_map[PERF_COUNT_HW_MAX] = 249 { 250 [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, 251 [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, 252 [PERF_COUNT_HW_CACHE_REFERENCES] = 0xff60, 253 [PERF_COUNT_HW_CACHE_MISSES] = 0x0964, 254 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, 255 [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, 256 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x0287, 257 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x0187, 258 }; 259 260 static u64 amd_pmu_event_map(int hw_event) 261 { 262 if (boot_cpu_data.x86 >= 0x17) 263 return amd_f17h_perfmon_event_map[hw_event]; 264 265 return amd_perfmon_event_map[hw_event]; 266 } 267 268 /* 269 * Previously calculated offsets 270 */ 271 static unsigned int event_offsets[X86_PMC_IDX_MAX] __read_mostly; 272 static unsigned int count_offsets[X86_PMC_IDX_MAX] __read_mostly; 273 274 /* 275 * Legacy CPUs: 276 * 4 counters starting at 0xc0010000 each offset by 1 277 * 278 * CPUs with core performance counter extensions: 279 * 6 counters starting at 0xc0010200 each offset by 2 280 */ 281 static inline int amd_pmu_addr_offset(int index, bool eventsel) 282 { 283 int offset; 284 285 if (!index) 286 return index; 287 288 if (eventsel) 289 offset = event_offsets[index]; 290 else 291 offset = count_offsets[index]; 292 293 if (offset) 294 return offset; 295 296 if (!boot_cpu_has(X86_FEATURE_PERFCTR_CORE)) 297 offset = index; 298 else 299 offset = index << 1; 300 301 if (eventsel) 302 event_offsets[index] = offset; 303 else 304 count_offsets[index] = offset; 305 306 return offset; 307 } 308 309 /* 310 * AMD64 events are detected based on their event codes. 311 */ 312 static inline unsigned int amd_get_event_code(struct hw_perf_event *hwc) 313 { 314 return ((hwc->config >> 24) & 0x0f00) | (hwc->config & 0x00ff); 315 } 316 317 static inline bool amd_is_pair_event_code(struct hw_perf_event *hwc) 318 { 319 if (!(x86_pmu.flags & PMU_FL_PAIR)) 320 return false; 321 322 switch (amd_get_event_code(hwc)) { 323 case 0x003: return true; /* Retired SSE/AVX FLOPs */ 324 default: return false; 325 } 326 } 327 328 static int amd_core_hw_config(struct perf_event *event) 329 { 330 if (event->attr.exclude_host && event->attr.exclude_guest) 331 /* 332 * When HO == GO == 1 the hardware treats that as GO == HO == 0 333 * and will count in both modes. We don't want to count in that 334 * case so we emulate no-counting by setting US = OS = 0. 335 */ 336 event->hw.config &= ~(ARCH_PERFMON_EVENTSEL_USR | 337 ARCH_PERFMON_EVENTSEL_OS); 338 else if (event->attr.exclude_host) 339 event->hw.config |= AMD64_EVENTSEL_GUESTONLY; 340 else if (event->attr.exclude_guest) 341 event->hw.config |= AMD64_EVENTSEL_HOSTONLY; 342 343 if ((x86_pmu.flags & PMU_FL_PAIR) && amd_is_pair_event_code(&event->hw)) 344 event->hw.flags |= PERF_X86_EVENT_PAIR; 345 346 return 0; 347 } 348 349 static inline int amd_is_nb_event(struct hw_perf_event *hwc) 350 { 351 return (hwc->config & 0xe0) == 0xe0; 352 } 353 354 static inline int amd_has_nb(struct cpu_hw_events *cpuc) 355 { 356 struct amd_nb *nb = cpuc->amd_nb; 357 358 return nb && nb->nb_id != -1; 359 } 360 361 static int amd_pmu_hw_config(struct perf_event *event) 362 { 363 int ret; 364 365 /* pass precise event sampling to ibs: */ 366 if (event->attr.precise_ip && get_ibs_caps()) 367 return -ENOENT; 368 369 if (has_branch_stack(event)) 370 return -EOPNOTSUPP; 371 372 ret = x86_pmu_hw_config(event); 373 if (ret) 374 return ret; 375 376 if (event->attr.type == PERF_TYPE_RAW) 377 event->hw.config |= event->attr.config & AMD64_RAW_EVENT_MASK; 378 379 return amd_core_hw_config(event); 380 } 381 382 static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc, 383 struct perf_event *event) 384 { 385 struct amd_nb *nb = cpuc->amd_nb; 386 int i; 387 388 /* 389 * need to scan whole list because event may not have 390 * been assigned during scheduling 391 * 392 * no race condition possible because event can only 393 * be removed on one CPU at a time AND PMU is disabled 394 * when we come here 395 */ 396 for (i = 0; i < x86_pmu.num_counters; i++) { 397 if (cmpxchg(nb->owners + i, event, NULL) == event) 398 break; 399 } 400 } 401 402 /* 403 * AMD64 NorthBridge events need special treatment because 404 * counter access needs to be synchronized across all cores 405 * of a package. Refer to BKDG section 3.12 406 * 407 * NB events are events measuring L3 cache, Hypertransport 408 * traffic. They are identified by an event code >= 0xe00. 409 * They measure events on the NorthBride which is shared 410 * by all cores on a package. NB events are counted on a 411 * shared set of counters. When a NB event is programmed 412 * in a counter, the data actually comes from a shared 413 * counter. Thus, access to those counters needs to be 414 * synchronized. 415 * 416 * We implement the synchronization such that no two cores 417 * can be measuring NB events using the same counters. Thus, 418 * we maintain a per-NB allocation table. The available slot 419 * is propagated using the event_constraint structure. 420 * 421 * We provide only one choice for each NB event based on 422 * the fact that only NB events have restrictions. Consequently, 423 * if a counter is available, there is a guarantee the NB event 424 * will be assigned to it. If no slot is available, an empty 425 * constraint is returned and scheduling will eventually fail 426 * for this event. 427 * 428 * Note that all cores attached the same NB compete for the same 429 * counters to host NB events, this is why we use atomic ops. Some 430 * multi-chip CPUs may have more than one NB. 431 * 432 * Given that resources are allocated (cmpxchg), they must be 433 * eventually freed for others to use. This is accomplished by 434 * calling __amd_put_nb_event_constraints() 435 * 436 * Non NB events are not impacted by this restriction. 437 */ 438 static struct event_constraint * 439 __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event, 440 struct event_constraint *c) 441 { 442 struct hw_perf_event *hwc = &event->hw; 443 struct amd_nb *nb = cpuc->amd_nb; 444 struct perf_event *old; 445 int idx, new = -1; 446 447 if (!c) 448 c = &unconstrained; 449 450 if (cpuc->is_fake) 451 return c; 452 453 /* 454 * detect if already present, if so reuse 455 * 456 * cannot merge with actual allocation 457 * because of possible holes 458 * 459 * event can already be present yet not assigned (in hwc->idx) 460 * because of successive calls to x86_schedule_events() from 461 * hw_perf_group_sched_in() without hw_perf_enable() 462 */ 463 for_each_set_bit(idx, c->idxmsk, x86_pmu.num_counters) { 464 if (new == -1 || hwc->idx == idx) 465 /* assign free slot, prefer hwc->idx */ 466 old = cmpxchg(nb->owners + idx, NULL, event); 467 else if (nb->owners[idx] == event) 468 /* event already present */ 469 old = event; 470 else 471 continue; 472 473 if (old && old != event) 474 continue; 475 476 /* reassign to this slot */ 477 if (new != -1) 478 cmpxchg(nb->owners + new, event, NULL); 479 new = idx; 480 481 /* already present, reuse */ 482 if (old == event) 483 break; 484 } 485 486 if (new == -1) 487 return &emptyconstraint; 488 489 return &nb->event_constraints[new]; 490 } 491 492 static struct amd_nb *amd_alloc_nb(int cpu) 493 { 494 struct amd_nb *nb; 495 int i; 496 497 nb = kzalloc_node(sizeof(struct amd_nb), GFP_KERNEL, cpu_to_node(cpu)); 498 if (!nb) 499 return NULL; 500 501 nb->nb_id = -1; 502 503 /* 504 * initialize all possible NB constraints 505 */ 506 for (i = 0; i < x86_pmu.num_counters; i++) { 507 __set_bit(i, nb->event_constraints[i].idxmsk); 508 nb->event_constraints[i].weight = 1; 509 } 510 return nb; 511 } 512 513 static int amd_pmu_cpu_prepare(int cpu) 514 { 515 struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); 516 517 WARN_ON_ONCE(cpuc->amd_nb); 518 519 if (!x86_pmu.amd_nb_constraints) 520 return 0; 521 522 cpuc->amd_nb = amd_alloc_nb(cpu); 523 if (!cpuc->amd_nb) 524 return -ENOMEM; 525 526 return 0; 527 } 528 529 static void amd_pmu_cpu_starting(int cpu) 530 { 531 struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); 532 void **onln = &cpuc->kfree_on_online[X86_PERF_KFREE_SHARED]; 533 struct amd_nb *nb; 534 int i, nb_id; 535 536 cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY; 537 538 if (!x86_pmu.amd_nb_constraints) 539 return; 540 541 nb_id = topology_die_id(cpu); 542 WARN_ON_ONCE(nb_id == BAD_APICID); 543 544 for_each_online_cpu(i) { 545 nb = per_cpu(cpu_hw_events, i).amd_nb; 546 if (WARN_ON_ONCE(!nb)) 547 continue; 548 549 if (nb->nb_id == nb_id) { 550 *onln = cpuc->amd_nb; 551 cpuc->amd_nb = nb; 552 break; 553 } 554 } 555 556 cpuc->amd_nb->nb_id = nb_id; 557 cpuc->amd_nb->refcnt++; 558 } 559 560 static void amd_pmu_cpu_dead(int cpu) 561 { 562 struct cpu_hw_events *cpuhw; 563 564 if (!x86_pmu.amd_nb_constraints) 565 return; 566 567 cpuhw = &per_cpu(cpu_hw_events, cpu); 568 569 if (cpuhw->amd_nb) { 570 struct amd_nb *nb = cpuhw->amd_nb; 571 572 if (nb->nb_id == -1 || --nb->refcnt == 0) 573 kfree(nb); 574 575 cpuhw->amd_nb = NULL; 576 } 577 } 578 579 /* 580 * When a PMC counter overflows, an NMI is used to process the event and 581 * reset the counter. NMI latency can result in the counter being updated 582 * before the NMI can run, which can result in what appear to be spurious 583 * NMIs. This function is intended to wait for the NMI to run and reset 584 * the counter to avoid possible unhandled NMI messages. 585 */ 586 #define OVERFLOW_WAIT_COUNT 50 587 588 static void amd_pmu_wait_on_overflow(int idx) 589 { 590 unsigned int i; 591 u64 counter; 592 593 /* 594 * Wait for the counter to be reset if it has overflowed. This loop 595 * should exit very, very quickly, but just in case, don't wait 596 * forever... 597 */ 598 for (i = 0; i < OVERFLOW_WAIT_COUNT; i++) { 599 rdmsrl(x86_pmu_event_addr(idx), counter); 600 if (counter & (1ULL << (x86_pmu.cntval_bits - 1))) 601 break; 602 603 /* Might be in IRQ context, so can't sleep */ 604 udelay(1); 605 } 606 } 607 608 static void amd_pmu_disable_all(void) 609 { 610 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 611 int idx; 612 613 x86_pmu_disable_all(); 614 615 /* 616 * This shouldn't be called from NMI context, but add a safeguard here 617 * to return, since if we're in NMI context we can't wait for an NMI 618 * to reset an overflowed counter value. 619 */ 620 if (in_nmi()) 621 return; 622 623 /* 624 * Check each counter for overflow and wait for it to be reset by the 625 * NMI if it has overflowed. This relies on the fact that all active 626 * counters are always enabled when this function is caled and 627 * ARCH_PERFMON_EVENTSEL_INT is always set. 628 */ 629 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 630 if (!test_bit(idx, cpuc->active_mask)) 631 continue; 632 633 amd_pmu_wait_on_overflow(idx); 634 } 635 } 636 637 static void amd_pmu_disable_event(struct perf_event *event) 638 { 639 x86_pmu_disable_event(event); 640 641 /* 642 * This can be called from NMI context (via x86_pmu_stop). The counter 643 * may have overflowed, but either way, we'll never see it get reset 644 * by the NMI if we're already in the NMI. And the NMI latency support 645 * below will take care of any pending NMI that might have been 646 * generated by the overflow. 647 */ 648 if (in_nmi()) 649 return; 650 651 amd_pmu_wait_on_overflow(event->hw.idx); 652 } 653 654 /* 655 * Because of NMI latency, if multiple PMC counters are active or other sources 656 * of NMIs are received, the perf NMI handler can handle one or more overflowed 657 * PMC counters outside of the NMI associated with the PMC overflow. If the NMI 658 * doesn't arrive at the LAPIC in time to become a pending NMI, then the kernel 659 * back-to-back NMI support won't be active. This PMC handler needs to take into 660 * account that this can occur, otherwise this could result in unknown NMI 661 * messages being issued. Examples of this is PMC overflow while in the NMI 662 * handler when multiple PMCs are active or PMC overflow while handling some 663 * other source of an NMI. 664 * 665 * Attempt to mitigate this by creating an NMI window in which un-handled NMIs 666 * received during this window will be claimed. This prevents extending the 667 * window past when it is possible that latent NMIs should be received. The 668 * per-CPU perf_nmi_tstamp will be set to the window end time whenever perf has 669 * handled a counter. When an un-handled NMI is received, it will be claimed 670 * only if arriving within that window. 671 */ 672 static int amd_pmu_handle_irq(struct pt_regs *regs) 673 { 674 int handled; 675 676 /* Process any counter overflows */ 677 handled = x86_pmu_handle_irq(regs); 678 679 /* 680 * If a counter was handled, record a timestamp such that un-handled 681 * NMIs will be claimed if arriving within that window. 682 */ 683 if (handled) { 684 this_cpu_write(perf_nmi_tstamp, jiffies + perf_nmi_window); 685 686 return handled; 687 } 688 689 if (time_after(jiffies, this_cpu_read(perf_nmi_tstamp))) 690 return NMI_DONE; 691 692 return NMI_HANDLED; 693 } 694 695 static struct event_constraint * 696 amd_get_event_constraints(struct cpu_hw_events *cpuc, int idx, 697 struct perf_event *event) 698 { 699 /* 700 * if not NB event or no NB, then no constraints 701 */ 702 if (!(amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))) 703 return &unconstrained; 704 705 return __amd_get_nb_event_constraints(cpuc, event, NULL); 706 } 707 708 static void amd_put_event_constraints(struct cpu_hw_events *cpuc, 709 struct perf_event *event) 710 { 711 if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw)) 712 __amd_put_nb_event_constraints(cpuc, event); 713 } 714 715 PMU_FORMAT_ATTR(event, "config:0-7,32-35"); 716 PMU_FORMAT_ATTR(umask, "config:8-15" ); 717 PMU_FORMAT_ATTR(edge, "config:18" ); 718 PMU_FORMAT_ATTR(inv, "config:23" ); 719 PMU_FORMAT_ATTR(cmask, "config:24-31" ); 720 721 static struct attribute *amd_format_attr[] = { 722 &format_attr_event.attr, 723 &format_attr_umask.attr, 724 &format_attr_edge.attr, 725 &format_attr_inv.attr, 726 &format_attr_cmask.attr, 727 NULL, 728 }; 729 730 /* AMD Family 15h */ 731 732 #define AMD_EVENT_TYPE_MASK 0x000000F0ULL 733 734 #define AMD_EVENT_FP 0x00000000ULL ... 0x00000010ULL 735 #define AMD_EVENT_LS 0x00000020ULL ... 0x00000030ULL 736 #define AMD_EVENT_DC 0x00000040ULL ... 0x00000050ULL 737 #define AMD_EVENT_CU 0x00000060ULL ... 0x00000070ULL 738 #define AMD_EVENT_IC_DE 0x00000080ULL ... 0x00000090ULL 739 #define AMD_EVENT_EX_LS 0x000000C0ULL 740 #define AMD_EVENT_DE 0x000000D0ULL 741 #define AMD_EVENT_NB 0x000000E0ULL ... 0x000000F0ULL 742 743 /* 744 * AMD family 15h event code/PMC mappings: 745 * 746 * type = event_code & 0x0F0: 747 * 748 * 0x000 FP PERF_CTL[5:3] 749 * 0x010 FP PERF_CTL[5:3] 750 * 0x020 LS PERF_CTL[5:0] 751 * 0x030 LS PERF_CTL[5:0] 752 * 0x040 DC PERF_CTL[5:0] 753 * 0x050 DC PERF_CTL[5:0] 754 * 0x060 CU PERF_CTL[2:0] 755 * 0x070 CU PERF_CTL[2:0] 756 * 0x080 IC/DE PERF_CTL[2:0] 757 * 0x090 IC/DE PERF_CTL[2:0] 758 * 0x0A0 --- 759 * 0x0B0 --- 760 * 0x0C0 EX/LS PERF_CTL[5:0] 761 * 0x0D0 DE PERF_CTL[2:0] 762 * 0x0E0 NB NB_PERF_CTL[3:0] 763 * 0x0F0 NB NB_PERF_CTL[3:0] 764 * 765 * Exceptions: 766 * 767 * 0x000 FP PERF_CTL[3], PERF_CTL[5:3] (*) 768 * 0x003 FP PERF_CTL[3] 769 * 0x004 FP PERF_CTL[3], PERF_CTL[5:3] (*) 770 * 0x00B FP PERF_CTL[3] 771 * 0x00D FP PERF_CTL[3] 772 * 0x023 DE PERF_CTL[2:0] 773 * 0x02D LS PERF_CTL[3] 774 * 0x02E LS PERF_CTL[3,0] 775 * 0x031 LS PERF_CTL[2:0] (**) 776 * 0x043 CU PERF_CTL[2:0] 777 * 0x045 CU PERF_CTL[2:0] 778 * 0x046 CU PERF_CTL[2:0] 779 * 0x054 CU PERF_CTL[2:0] 780 * 0x055 CU PERF_CTL[2:0] 781 * 0x08F IC PERF_CTL[0] 782 * 0x187 DE PERF_CTL[0] 783 * 0x188 DE PERF_CTL[0] 784 * 0x0DB EX PERF_CTL[5:0] 785 * 0x0DC LS PERF_CTL[5:0] 786 * 0x0DD LS PERF_CTL[5:0] 787 * 0x0DE LS PERF_CTL[5:0] 788 * 0x0DF LS PERF_CTL[5:0] 789 * 0x1C0 EX PERF_CTL[5:3] 790 * 0x1D6 EX PERF_CTL[5:0] 791 * 0x1D8 EX PERF_CTL[5:0] 792 * 793 * (*) depending on the umask all FPU counters may be used 794 * (**) only one unitmask enabled at a time 795 */ 796 797 static struct event_constraint amd_f15_PMC0 = EVENT_CONSTRAINT(0, 0x01, 0); 798 static struct event_constraint amd_f15_PMC20 = EVENT_CONSTRAINT(0, 0x07, 0); 799 static struct event_constraint amd_f15_PMC3 = EVENT_CONSTRAINT(0, 0x08, 0); 800 static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0); 801 static struct event_constraint amd_f15_PMC50 = EVENT_CONSTRAINT(0, 0x3F, 0); 802 static struct event_constraint amd_f15_PMC53 = EVENT_CONSTRAINT(0, 0x38, 0); 803 804 static struct event_constraint * 805 amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, int idx, 806 struct perf_event *event) 807 { 808 struct hw_perf_event *hwc = &event->hw; 809 unsigned int event_code = amd_get_event_code(hwc); 810 811 switch (event_code & AMD_EVENT_TYPE_MASK) { 812 case AMD_EVENT_FP: 813 switch (event_code) { 814 case 0x000: 815 if (!(hwc->config & 0x0000F000ULL)) 816 break; 817 if (!(hwc->config & 0x00000F00ULL)) 818 break; 819 return &amd_f15_PMC3; 820 case 0x004: 821 if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) 822 break; 823 return &amd_f15_PMC3; 824 case 0x003: 825 case 0x00B: 826 case 0x00D: 827 return &amd_f15_PMC3; 828 } 829 return &amd_f15_PMC53; 830 case AMD_EVENT_LS: 831 case AMD_EVENT_DC: 832 case AMD_EVENT_EX_LS: 833 switch (event_code) { 834 case 0x023: 835 case 0x043: 836 case 0x045: 837 case 0x046: 838 case 0x054: 839 case 0x055: 840 return &amd_f15_PMC20; 841 case 0x02D: 842 return &amd_f15_PMC3; 843 case 0x02E: 844 return &amd_f15_PMC30; 845 case 0x031: 846 if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) 847 return &amd_f15_PMC20; 848 return &emptyconstraint; 849 case 0x1C0: 850 return &amd_f15_PMC53; 851 default: 852 return &amd_f15_PMC50; 853 } 854 case AMD_EVENT_CU: 855 case AMD_EVENT_IC_DE: 856 case AMD_EVENT_DE: 857 switch (event_code) { 858 case 0x08F: 859 case 0x187: 860 case 0x188: 861 return &amd_f15_PMC0; 862 case 0x0DB ... 0x0DF: 863 case 0x1D6: 864 case 0x1D8: 865 return &amd_f15_PMC50; 866 default: 867 return &amd_f15_PMC20; 868 } 869 case AMD_EVENT_NB: 870 /* moved to uncore.c */ 871 return &emptyconstraint; 872 default: 873 return &emptyconstraint; 874 } 875 } 876 877 static struct event_constraint pair_constraint; 878 879 static struct event_constraint * 880 amd_get_event_constraints_f17h(struct cpu_hw_events *cpuc, int idx, 881 struct perf_event *event) 882 { 883 struct hw_perf_event *hwc = &event->hw; 884 885 if (amd_is_pair_event_code(hwc)) 886 return &pair_constraint; 887 888 return &unconstrained; 889 } 890 891 static void amd_put_event_constraints_f17h(struct cpu_hw_events *cpuc, 892 struct perf_event *event) 893 { 894 struct hw_perf_event *hwc = &event->hw; 895 896 if (is_counter_pair(hwc)) 897 --cpuc->n_pair; 898 } 899 900 static ssize_t amd_event_sysfs_show(char *page, u64 config) 901 { 902 u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT) | 903 (config & AMD64_EVENTSEL_EVENT) >> 24; 904 905 return x86_event_sysfs_show(page, config, event); 906 } 907 908 static __initconst const struct x86_pmu amd_pmu = { 909 .name = "AMD", 910 .handle_irq = amd_pmu_handle_irq, 911 .disable_all = amd_pmu_disable_all, 912 .enable_all = x86_pmu_enable_all, 913 .enable = x86_pmu_enable_event, 914 .disable = amd_pmu_disable_event, 915 .hw_config = amd_pmu_hw_config, 916 .schedule_events = x86_schedule_events, 917 .eventsel = MSR_K7_EVNTSEL0, 918 .perfctr = MSR_K7_PERFCTR0, 919 .addr_offset = amd_pmu_addr_offset, 920 .event_map = amd_pmu_event_map, 921 .max_events = ARRAY_SIZE(amd_perfmon_event_map), 922 .num_counters = AMD64_NUM_COUNTERS, 923 .cntval_bits = 48, 924 .cntval_mask = (1ULL << 48) - 1, 925 .apic = 1, 926 /* use highest bit to detect overflow */ 927 .max_period = (1ULL << 47) - 1, 928 .get_event_constraints = amd_get_event_constraints, 929 .put_event_constraints = amd_put_event_constraints, 930 931 .format_attrs = amd_format_attr, 932 .events_sysfs_show = amd_event_sysfs_show, 933 934 .cpu_prepare = amd_pmu_cpu_prepare, 935 .cpu_starting = amd_pmu_cpu_starting, 936 .cpu_dead = amd_pmu_cpu_dead, 937 938 .amd_nb_constraints = 1, 939 }; 940 941 static int __init amd_core_pmu_init(void) 942 { 943 u64 even_ctr_mask = 0ULL; 944 int i; 945 946 if (!boot_cpu_has(X86_FEATURE_PERFCTR_CORE)) 947 return 0; 948 949 /* Avoid calculating the value each time in the NMI handler */ 950 perf_nmi_window = msecs_to_jiffies(100); 951 952 /* 953 * If core performance counter extensions exists, we must use 954 * MSR_F15H_PERF_CTL/MSR_F15H_PERF_CTR msrs. See also 955 * amd_pmu_addr_offset(). 956 */ 957 x86_pmu.eventsel = MSR_F15H_PERF_CTL; 958 x86_pmu.perfctr = MSR_F15H_PERF_CTR; 959 x86_pmu.num_counters = AMD64_NUM_COUNTERS_CORE; 960 /* 961 * AMD Core perfctr has separate MSRs for the NB events, see 962 * the amd/uncore.c driver. 963 */ 964 x86_pmu.amd_nb_constraints = 0; 965 966 if (boot_cpu_data.x86 == 0x15) { 967 pr_cont("Fam15h "); 968 x86_pmu.get_event_constraints = amd_get_event_constraints_f15h; 969 } 970 if (boot_cpu_data.x86 >= 0x17) { 971 pr_cont("Fam17h+ "); 972 /* 973 * Family 17h and compatibles have constraints for Large 974 * Increment per Cycle events: they may only be assigned an 975 * even numbered counter that has a consecutive adjacent odd 976 * numbered counter following it. 977 */ 978 for (i = 0; i < x86_pmu.num_counters - 1; i += 2) 979 even_ctr_mask |= 1 << i; 980 981 pair_constraint = (struct event_constraint) 982 __EVENT_CONSTRAINT(0, even_ctr_mask, 0, 983 x86_pmu.num_counters / 2, 0, 984 PERF_X86_EVENT_PAIR); 985 986 x86_pmu.get_event_constraints = amd_get_event_constraints_f17h; 987 x86_pmu.put_event_constraints = amd_put_event_constraints_f17h; 988 x86_pmu.perf_ctr_pair_en = AMD_MERGE_EVENT_ENABLE; 989 x86_pmu.flags |= PMU_FL_PAIR; 990 } 991 992 pr_cont("core perfctr, "); 993 return 0; 994 } 995 996 __init int amd_pmu_init(void) 997 { 998 int ret; 999 1000 /* Performance-monitoring supported from K7 and later: */ 1001 if (boot_cpu_data.x86 < 6) 1002 return -ENODEV; 1003 1004 x86_pmu = amd_pmu; 1005 1006 ret = amd_core_pmu_init(); 1007 if (ret) 1008 return ret; 1009 1010 if (num_possible_cpus() == 1) { 1011 /* 1012 * No point in allocating data structures to serialize 1013 * against other CPUs, when there is only the one CPU. 1014 */ 1015 x86_pmu.amd_nb_constraints = 0; 1016 } 1017 1018 if (boot_cpu_data.x86 >= 0x17) 1019 memcpy(hw_cache_event_ids, amd_hw_cache_event_ids_f17h, sizeof(hw_cache_event_ids)); 1020 else 1021 memcpy(hw_cache_event_ids, amd_hw_cache_event_ids, sizeof(hw_cache_event_ids)); 1022 1023 return 0; 1024 } 1025 1026 void amd_pmu_enable_virt(void) 1027 { 1028 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1029 1030 cpuc->perf_ctr_virt_mask = 0; 1031 1032 /* Reload all events */ 1033 amd_pmu_disable_all(); 1034 x86_pmu_enable_all(0); 1035 } 1036 EXPORT_SYMBOL_GPL(amd_pmu_enable_virt); 1037 1038 void amd_pmu_disable_virt(void) 1039 { 1040 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1041 1042 /* 1043 * We only mask out the Host-only bit so that host-only counting works 1044 * when SVM is disabled. If someone sets up a guest-only counter when 1045 * SVM is disabled the Guest-only bits still gets set and the counter 1046 * will not count anything. 1047 */ 1048 cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY; 1049 1050 /* Reload all events */ 1051 amd_pmu_disable_all(); 1052 x86_pmu_enable_all(0); 1053 } 1054 EXPORT_SYMBOL_GPL(amd_pmu_disable_virt); 1055