1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/perf_event.h> 3 #include <linux/jump_label.h> 4 #include <linux/export.h> 5 #include <linux/types.h> 6 #include <linux/init.h> 7 #include <linux/slab.h> 8 #include <linux/delay.h> 9 #include <linux/jiffies.h> 10 #include <asm/apicdef.h> 11 #include <asm/apic.h> 12 #include <asm/nmi.h> 13 14 #include "../perf_event.h" 15 16 static DEFINE_PER_CPU(unsigned long, perf_nmi_tstamp); 17 static unsigned long perf_nmi_window; 18 19 /* AMD Event 0xFFF: Merge. Used with Large Increment per Cycle events */ 20 #define AMD_MERGE_EVENT ((0xFULL << 32) | 0xFFULL) 21 #define AMD_MERGE_EVENT_ENABLE (AMD_MERGE_EVENT | ARCH_PERFMON_EVENTSEL_ENABLE) 22 23 /* PMC Enable and Overflow bits for PerfCntrGlobal* registers */ 24 static u64 amd_pmu_global_cntr_mask __read_mostly; 25 26 static __initconst const u64 amd_hw_cache_event_ids 27 [PERF_COUNT_HW_CACHE_MAX] 28 [PERF_COUNT_HW_CACHE_OP_MAX] 29 [PERF_COUNT_HW_CACHE_RESULT_MAX] = 30 { 31 [ C(L1D) ] = { 32 [ C(OP_READ) ] = { 33 [ C(RESULT_ACCESS) ] = 0x0040, /* Data Cache Accesses */ 34 [ C(RESULT_MISS) ] = 0x0141, /* Data Cache Misses */ 35 }, 36 [ C(OP_WRITE) ] = { 37 [ C(RESULT_ACCESS) ] = 0, 38 [ C(RESULT_MISS) ] = 0, 39 }, 40 [ C(OP_PREFETCH) ] = { 41 [ C(RESULT_ACCESS) ] = 0x0267, /* Data Prefetcher :attempts */ 42 [ C(RESULT_MISS) ] = 0x0167, /* Data Prefetcher :cancelled */ 43 }, 44 }, 45 [ C(L1I ) ] = { 46 [ C(OP_READ) ] = { 47 [ C(RESULT_ACCESS) ] = 0x0080, /* Instruction cache fetches */ 48 [ C(RESULT_MISS) ] = 0x0081, /* Instruction cache misses */ 49 }, 50 [ C(OP_WRITE) ] = { 51 [ C(RESULT_ACCESS) ] = -1, 52 [ C(RESULT_MISS) ] = -1, 53 }, 54 [ C(OP_PREFETCH) ] = { 55 [ C(RESULT_ACCESS) ] = 0x014B, /* Prefetch Instructions :Load */ 56 [ C(RESULT_MISS) ] = 0, 57 }, 58 }, 59 [ C(LL ) ] = { 60 [ C(OP_READ) ] = { 61 [ C(RESULT_ACCESS) ] = 0x037D, /* Requests to L2 Cache :IC+DC */ 62 [ C(RESULT_MISS) ] = 0x037E, /* L2 Cache Misses : IC+DC */ 63 }, 64 [ C(OP_WRITE) ] = { 65 [ C(RESULT_ACCESS) ] = 0x017F, /* L2 Fill/Writeback */ 66 [ C(RESULT_MISS) ] = 0, 67 }, 68 [ C(OP_PREFETCH) ] = { 69 [ C(RESULT_ACCESS) ] = 0, 70 [ C(RESULT_MISS) ] = 0, 71 }, 72 }, 73 [ C(DTLB) ] = { 74 [ C(OP_READ) ] = { 75 [ C(RESULT_ACCESS) ] = 0x0040, /* Data Cache Accesses */ 76 [ C(RESULT_MISS) ] = 0x0746, /* L1_DTLB_AND_L2_DLTB_MISS.ALL */ 77 }, 78 [ C(OP_WRITE) ] = { 79 [ C(RESULT_ACCESS) ] = 0, 80 [ C(RESULT_MISS) ] = 0, 81 }, 82 [ C(OP_PREFETCH) ] = { 83 [ C(RESULT_ACCESS) ] = 0, 84 [ C(RESULT_MISS) ] = 0, 85 }, 86 }, 87 [ C(ITLB) ] = { 88 [ C(OP_READ) ] = { 89 [ C(RESULT_ACCESS) ] = 0x0080, /* Instruction fecthes */ 90 [ C(RESULT_MISS) ] = 0x0385, /* L1_ITLB_AND_L2_ITLB_MISS.ALL */ 91 }, 92 [ C(OP_WRITE) ] = { 93 [ C(RESULT_ACCESS) ] = -1, 94 [ C(RESULT_MISS) ] = -1, 95 }, 96 [ C(OP_PREFETCH) ] = { 97 [ C(RESULT_ACCESS) ] = -1, 98 [ C(RESULT_MISS) ] = -1, 99 }, 100 }, 101 [ C(BPU ) ] = { 102 [ C(OP_READ) ] = { 103 [ C(RESULT_ACCESS) ] = 0x00c2, /* Retired Branch Instr. */ 104 [ C(RESULT_MISS) ] = 0x00c3, /* Retired Mispredicted BI */ 105 }, 106 [ C(OP_WRITE) ] = { 107 [ C(RESULT_ACCESS) ] = -1, 108 [ C(RESULT_MISS) ] = -1, 109 }, 110 [ C(OP_PREFETCH) ] = { 111 [ C(RESULT_ACCESS) ] = -1, 112 [ C(RESULT_MISS) ] = -1, 113 }, 114 }, 115 [ C(NODE) ] = { 116 [ C(OP_READ) ] = { 117 [ C(RESULT_ACCESS) ] = 0xb8e9, /* CPU Request to Memory, l+r */ 118 [ C(RESULT_MISS) ] = 0x98e9, /* CPU Request to Memory, r */ 119 }, 120 [ C(OP_WRITE) ] = { 121 [ C(RESULT_ACCESS) ] = -1, 122 [ C(RESULT_MISS) ] = -1, 123 }, 124 [ C(OP_PREFETCH) ] = { 125 [ C(RESULT_ACCESS) ] = -1, 126 [ C(RESULT_MISS) ] = -1, 127 }, 128 }, 129 }; 130 131 static __initconst const u64 amd_hw_cache_event_ids_f17h 132 [PERF_COUNT_HW_CACHE_MAX] 133 [PERF_COUNT_HW_CACHE_OP_MAX] 134 [PERF_COUNT_HW_CACHE_RESULT_MAX] = { 135 [C(L1D)] = { 136 [C(OP_READ)] = { 137 [C(RESULT_ACCESS)] = 0x0040, /* Data Cache Accesses */ 138 [C(RESULT_MISS)] = 0xc860, /* L2$ access from DC Miss */ 139 }, 140 [C(OP_WRITE)] = { 141 [C(RESULT_ACCESS)] = 0, 142 [C(RESULT_MISS)] = 0, 143 }, 144 [C(OP_PREFETCH)] = { 145 [C(RESULT_ACCESS)] = 0xff5a, /* h/w prefetch DC Fills */ 146 [C(RESULT_MISS)] = 0, 147 }, 148 }, 149 [C(L1I)] = { 150 [C(OP_READ)] = { 151 [C(RESULT_ACCESS)] = 0x0080, /* Instruction cache fetches */ 152 [C(RESULT_MISS)] = 0x0081, /* Instruction cache misses */ 153 }, 154 [C(OP_WRITE)] = { 155 [C(RESULT_ACCESS)] = -1, 156 [C(RESULT_MISS)] = -1, 157 }, 158 [C(OP_PREFETCH)] = { 159 [C(RESULT_ACCESS)] = 0, 160 [C(RESULT_MISS)] = 0, 161 }, 162 }, 163 [C(LL)] = { 164 [C(OP_READ)] = { 165 [C(RESULT_ACCESS)] = 0, 166 [C(RESULT_MISS)] = 0, 167 }, 168 [C(OP_WRITE)] = { 169 [C(RESULT_ACCESS)] = 0, 170 [C(RESULT_MISS)] = 0, 171 }, 172 [C(OP_PREFETCH)] = { 173 [C(RESULT_ACCESS)] = 0, 174 [C(RESULT_MISS)] = 0, 175 }, 176 }, 177 [C(DTLB)] = { 178 [C(OP_READ)] = { 179 [C(RESULT_ACCESS)] = 0xff45, /* All L2 DTLB accesses */ 180 [C(RESULT_MISS)] = 0xf045, /* L2 DTLB misses (PT walks) */ 181 }, 182 [C(OP_WRITE)] = { 183 [C(RESULT_ACCESS)] = 0, 184 [C(RESULT_MISS)] = 0, 185 }, 186 [C(OP_PREFETCH)] = { 187 [C(RESULT_ACCESS)] = 0, 188 [C(RESULT_MISS)] = 0, 189 }, 190 }, 191 [C(ITLB)] = { 192 [C(OP_READ)] = { 193 [C(RESULT_ACCESS)] = 0x0084, /* L1 ITLB misses, L2 ITLB hits */ 194 [C(RESULT_MISS)] = 0xff85, /* L1 ITLB misses, L2 misses */ 195 }, 196 [C(OP_WRITE)] = { 197 [C(RESULT_ACCESS)] = -1, 198 [C(RESULT_MISS)] = -1, 199 }, 200 [C(OP_PREFETCH)] = { 201 [C(RESULT_ACCESS)] = -1, 202 [C(RESULT_MISS)] = -1, 203 }, 204 }, 205 [C(BPU)] = { 206 [C(OP_READ)] = { 207 [C(RESULT_ACCESS)] = 0x00c2, /* Retired Branch Instr. */ 208 [C(RESULT_MISS)] = 0x00c3, /* Retired Mispredicted BI */ 209 }, 210 [C(OP_WRITE)] = { 211 [C(RESULT_ACCESS)] = -1, 212 [C(RESULT_MISS)] = -1, 213 }, 214 [C(OP_PREFETCH)] = { 215 [C(RESULT_ACCESS)] = -1, 216 [C(RESULT_MISS)] = -1, 217 }, 218 }, 219 [C(NODE)] = { 220 [C(OP_READ)] = { 221 [C(RESULT_ACCESS)] = 0, 222 [C(RESULT_MISS)] = 0, 223 }, 224 [C(OP_WRITE)] = { 225 [C(RESULT_ACCESS)] = -1, 226 [C(RESULT_MISS)] = -1, 227 }, 228 [C(OP_PREFETCH)] = { 229 [C(RESULT_ACCESS)] = -1, 230 [C(RESULT_MISS)] = -1, 231 }, 232 }, 233 }; 234 235 /* 236 * AMD Performance Monitor K7 and later, up to and including Family 16h: 237 */ 238 static const u64 amd_perfmon_event_map[PERF_COUNT_HW_MAX] = 239 { 240 [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, 241 [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, 242 [PERF_COUNT_HW_CACHE_REFERENCES] = 0x077d, 243 [PERF_COUNT_HW_CACHE_MISSES] = 0x077e, 244 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, 245 [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, 246 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x00d0, /* "Decoder empty" event */ 247 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x00d1, /* "Dispatch stalls" event */ 248 }; 249 250 /* 251 * AMD Performance Monitor Family 17h and later: 252 */ 253 static const u64 amd_f17h_perfmon_event_map[PERF_COUNT_HW_MAX] = 254 { 255 [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, 256 [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, 257 [PERF_COUNT_HW_CACHE_REFERENCES] = 0xff60, 258 [PERF_COUNT_HW_CACHE_MISSES] = 0x0964, 259 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, 260 [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, 261 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x0287, 262 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x0187, 263 }; 264 265 static u64 amd_pmu_event_map(int hw_event) 266 { 267 if (boot_cpu_data.x86 >= 0x17) 268 return amd_f17h_perfmon_event_map[hw_event]; 269 270 return amd_perfmon_event_map[hw_event]; 271 } 272 273 /* 274 * Previously calculated offsets 275 */ 276 static unsigned int event_offsets[X86_PMC_IDX_MAX] __read_mostly; 277 static unsigned int count_offsets[X86_PMC_IDX_MAX] __read_mostly; 278 279 /* 280 * Legacy CPUs: 281 * 4 counters starting at 0xc0010000 each offset by 1 282 * 283 * CPUs with core performance counter extensions: 284 * 6 counters starting at 0xc0010200 each offset by 2 285 */ 286 static inline int amd_pmu_addr_offset(int index, bool eventsel) 287 { 288 int offset; 289 290 if (!index) 291 return index; 292 293 if (eventsel) 294 offset = event_offsets[index]; 295 else 296 offset = count_offsets[index]; 297 298 if (offset) 299 return offset; 300 301 if (!boot_cpu_has(X86_FEATURE_PERFCTR_CORE)) 302 offset = index; 303 else 304 offset = index << 1; 305 306 if (eventsel) 307 event_offsets[index] = offset; 308 else 309 count_offsets[index] = offset; 310 311 return offset; 312 } 313 314 /* 315 * AMD64 events are detected based on their event codes. 316 */ 317 static inline unsigned int amd_get_event_code(struct hw_perf_event *hwc) 318 { 319 return ((hwc->config >> 24) & 0x0f00) | (hwc->config & 0x00ff); 320 } 321 322 static inline bool amd_is_pair_event_code(struct hw_perf_event *hwc) 323 { 324 if (!(x86_pmu.flags & PMU_FL_PAIR)) 325 return false; 326 327 switch (amd_get_event_code(hwc)) { 328 case 0x003: return true; /* Retired SSE/AVX FLOPs */ 329 default: return false; 330 } 331 } 332 333 DEFINE_STATIC_CALL_RET0(amd_pmu_branch_hw_config, *x86_pmu.hw_config); 334 335 static int amd_core_hw_config(struct perf_event *event) 336 { 337 if (event->attr.exclude_host && event->attr.exclude_guest) 338 /* 339 * When HO == GO == 1 the hardware treats that as GO == HO == 0 340 * and will count in both modes. We don't want to count in that 341 * case so we emulate no-counting by setting US = OS = 0. 342 */ 343 event->hw.config &= ~(ARCH_PERFMON_EVENTSEL_USR | 344 ARCH_PERFMON_EVENTSEL_OS); 345 else if (event->attr.exclude_host) 346 event->hw.config |= AMD64_EVENTSEL_GUESTONLY; 347 else if (event->attr.exclude_guest) 348 event->hw.config |= AMD64_EVENTSEL_HOSTONLY; 349 350 if ((x86_pmu.flags & PMU_FL_PAIR) && amd_is_pair_event_code(&event->hw)) 351 event->hw.flags |= PERF_X86_EVENT_PAIR; 352 353 if (has_branch_stack(event)) 354 return static_call(amd_pmu_branch_hw_config)(event); 355 356 return 0; 357 } 358 359 static inline int amd_is_nb_event(struct hw_perf_event *hwc) 360 { 361 return (hwc->config & 0xe0) == 0xe0; 362 } 363 364 static inline int amd_has_nb(struct cpu_hw_events *cpuc) 365 { 366 struct amd_nb *nb = cpuc->amd_nb; 367 368 return nb && nb->nb_id != -1; 369 } 370 371 static int amd_pmu_hw_config(struct perf_event *event) 372 { 373 int ret; 374 375 /* pass precise event sampling to ibs: */ 376 if (event->attr.precise_ip && get_ibs_caps()) 377 return -ENOENT; 378 379 if (has_branch_stack(event) && !x86_pmu.lbr_nr) 380 return -EOPNOTSUPP; 381 382 ret = x86_pmu_hw_config(event); 383 if (ret) 384 return ret; 385 386 if (event->attr.type == PERF_TYPE_RAW) 387 event->hw.config |= event->attr.config & AMD64_RAW_EVENT_MASK; 388 389 return amd_core_hw_config(event); 390 } 391 392 static void __amd_put_nb_event_constraints(struct cpu_hw_events *cpuc, 393 struct perf_event *event) 394 { 395 struct amd_nb *nb = cpuc->amd_nb; 396 int i; 397 398 /* 399 * need to scan whole list because event may not have 400 * been assigned during scheduling 401 * 402 * no race condition possible because event can only 403 * be removed on one CPU at a time AND PMU is disabled 404 * when we come here 405 */ 406 for (i = 0; i < x86_pmu.num_counters; i++) { 407 if (cmpxchg(nb->owners + i, event, NULL) == event) 408 break; 409 } 410 } 411 412 /* 413 * AMD64 NorthBridge events need special treatment because 414 * counter access needs to be synchronized across all cores 415 * of a package. Refer to BKDG section 3.12 416 * 417 * NB events are events measuring L3 cache, Hypertransport 418 * traffic. They are identified by an event code >= 0xe00. 419 * They measure events on the NorthBride which is shared 420 * by all cores on a package. NB events are counted on a 421 * shared set of counters. When a NB event is programmed 422 * in a counter, the data actually comes from a shared 423 * counter. Thus, access to those counters needs to be 424 * synchronized. 425 * 426 * We implement the synchronization such that no two cores 427 * can be measuring NB events using the same counters. Thus, 428 * we maintain a per-NB allocation table. The available slot 429 * is propagated using the event_constraint structure. 430 * 431 * We provide only one choice for each NB event based on 432 * the fact that only NB events have restrictions. Consequently, 433 * if a counter is available, there is a guarantee the NB event 434 * will be assigned to it. If no slot is available, an empty 435 * constraint is returned and scheduling will eventually fail 436 * for this event. 437 * 438 * Note that all cores attached the same NB compete for the same 439 * counters to host NB events, this is why we use atomic ops. Some 440 * multi-chip CPUs may have more than one NB. 441 * 442 * Given that resources are allocated (cmpxchg), they must be 443 * eventually freed for others to use. This is accomplished by 444 * calling __amd_put_nb_event_constraints() 445 * 446 * Non NB events are not impacted by this restriction. 447 */ 448 static struct event_constraint * 449 __amd_get_nb_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event, 450 struct event_constraint *c) 451 { 452 struct hw_perf_event *hwc = &event->hw; 453 struct amd_nb *nb = cpuc->amd_nb; 454 struct perf_event *old; 455 int idx, new = -1; 456 457 if (!c) 458 c = &unconstrained; 459 460 if (cpuc->is_fake) 461 return c; 462 463 /* 464 * detect if already present, if so reuse 465 * 466 * cannot merge with actual allocation 467 * because of possible holes 468 * 469 * event can already be present yet not assigned (in hwc->idx) 470 * because of successive calls to x86_schedule_events() from 471 * hw_perf_group_sched_in() without hw_perf_enable() 472 */ 473 for_each_set_bit(idx, c->idxmsk, x86_pmu.num_counters) { 474 if (new == -1 || hwc->idx == idx) 475 /* assign free slot, prefer hwc->idx */ 476 old = cmpxchg(nb->owners + idx, NULL, event); 477 else if (nb->owners[idx] == event) 478 /* event already present */ 479 old = event; 480 else 481 continue; 482 483 if (old && old != event) 484 continue; 485 486 /* reassign to this slot */ 487 if (new != -1) 488 cmpxchg(nb->owners + new, event, NULL); 489 new = idx; 490 491 /* already present, reuse */ 492 if (old == event) 493 break; 494 } 495 496 if (new == -1) 497 return &emptyconstraint; 498 499 return &nb->event_constraints[new]; 500 } 501 502 static struct amd_nb *amd_alloc_nb(int cpu) 503 { 504 struct amd_nb *nb; 505 int i; 506 507 nb = kzalloc_node(sizeof(struct amd_nb), GFP_KERNEL, cpu_to_node(cpu)); 508 if (!nb) 509 return NULL; 510 511 nb->nb_id = -1; 512 513 /* 514 * initialize all possible NB constraints 515 */ 516 for (i = 0; i < x86_pmu.num_counters; i++) { 517 __set_bit(i, nb->event_constraints[i].idxmsk); 518 nb->event_constraints[i].weight = 1; 519 } 520 return nb; 521 } 522 523 typedef void (amd_pmu_branch_reset_t)(void); 524 DEFINE_STATIC_CALL_NULL(amd_pmu_branch_reset, amd_pmu_branch_reset_t); 525 526 static void amd_pmu_cpu_reset(int cpu) 527 { 528 if (x86_pmu.lbr_nr) 529 static_call(amd_pmu_branch_reset)(); 530 531 if (x86_pmu.version < 2) 532 return; 533 534 /* Clear enable bits i.e. PerfCntrGlobalCtl.PerfCntrEn */ 535 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, 0); 536 537 /* Clear overflow bits i.e. PerfCntrGLobalStatus.PerfCntrOvfl */ 538 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, amd_pmu_global_cntr_mask); 539 } 540 541 static int amd_pmu_cpu_prepare(int cpu) 542 { 543 struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); 544 545 cpuc->lbr_sel = kzalloc_node(sizeof(struct er_account), GFP_KERNEL, 546 cpu_to_node(cpu)); 547 if (!cpuc->lbr_sel) 548 return -ENOMEM; 549 550 WARN_ON_ONCE(cpuc->amd_nb); 551 552 if (!x86_pmu.amd_nb_constraints) 553 return 0; 554 555 cpuc->amd_nb = amd_alloc_nb(cpu); 556 if (cpuc->amd_nb) 557 return 0; 558 559 kfree(cpuc->lbr_sel); 560 cpuc->lbr_sel = NULL; 561 562 return -ENOMEM; 563 } 564 565 static void amd_pmu_cpu_starting(int cpu) 566 { 567 struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); 568 void **onln = &cpuc->kfree_on_online[X86_PERF_KFREE_SHARED]; 569 struct amd_nb *nb; 570 int i, nb_id; 571 572 cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY; 573 574 if (!x86_pmu.amd_nb_constraints) 575 return; 576 577 nb_id = topology_die_id(cpu); 578 WARN_ON_ONCE(nb_id == BAD_APICID); 579 580 for_each_online_cpu(i) { 581 nb = per_cpu(cpu_hw_events, i).amd_nb; 582 if (WARN_ON_ONCE(!nb)) 583 continue; 584 585 if (nb->nb_id == nb_id) { 586 *onln = cpuc->amd_nb; 587 cpuc->amd_nb = nb; 588 break; 589 } 590 } 591 592 cpuc->amd_nb->nb_id = nb_id; 593 cpuc->amd_nb->refcnt++; 594 595 amd_pmu_cpu_reset(cpu); 596 } 597 598 static void amd_pmu_cpu_dead(int cpu) 599 { 600 struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu); 601 602 kfree(cpuhw->lbr_sel); 603 cpuhw->lbr_sel = NULL; 604 605 if (!x86_pmu.amd_nb_constraints) 606 return; 607 608 if (cpuhw->amd_nb) { 609 struct amd_nb *nb = cpuhw->amd_nb; 610 611 if (nb->nb_id == -1 || --nb->refcnt == 0) 612 kfree(nb); 613 614 cpuhw->amd_nb = NULL; 615 } 616 617 amd_pmu_cpu_reset(cpu); 618 } 619 620 static inline void amd_pmu_set_global_ctl(u64 ctl) 621 { 622 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, ctl); 623 } 624 625 static inline u64 amd_pmu_get_global_status(void) 626 { 627 u64 status; 628 629 /* PerfCntrGlobalStatus is read-only */ 630 rdmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS, status); 631 632 return status; 633 } 634 635 static inline void amd_pmu_ack_global_status(u64 status) 636 { 637 /* 638 * PerfCntrGlobalStatus is read-only but an overflow acknowledgment 639 * mechanism exists; writing 1 to a bit in PerfCntrGlobalStatusClr 640 * clears the same bit in PerfCntrGlobalStatus 641 */ 642 643 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, status); 644 } 645 646 static bool amd_pmu_test_overflow_topbit(int idx) 647 { 648 u64 counter; 649 650 rdmsrl(x86_pmu_event_addr(idx), counter); 651 652 return !(counter & BIT_ULL(x86_pmu.cntval_bits - 1)); 653 } 654 655 static bool amd_pmu_test_overflow_status(int idx) 656 { 657 return amd_pmu_get_global_status() & BIT_ULL(idx); 658 } 659 660 DEFINE_STATIC_CALL(amd_pmu_test_overflow, amd_pmu_test_overflow_topbit); 661 662 /* 663 * When a PMC counter overflows, an NMI is used to process the event and 664 * reset the counter. NMI latency can result in the counter being updated 665 * before the NMI can run, which can result in what appear to be spurious 666 * NMIs. This function is intended to wait for the NMI to run and reset 667 * the counter to avoid possible unhandled NMI messages. 668 */ 669 #define OVERFLOW_WAIT_COUNT 50 670 671 static void amd_pmu_wait_on_overflow(int idx) 672 { 673 unsigned int i; 674 675 /* 676 * Wait for the counter to be reset if it has overflowed. This loop 677 * should exit very, very quickly, but just in case, don't wait 678 * forever... 679 */ 680 for (i = 0; i < OVERFLOW_WAIT_COUNT; i++) { 681 if (!static_call(amd_pmu_test_overflow)(idx)) 682 break; 683 684 /* Might be in IRQ context, so can't sleep */ 685 udelay(1); 686 } 687 } 688 689 static void amd_pmu_check_overflow(void) 690 { 691 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 692 int idx; 693 694 /* 695 * This shouldn't be called from NMI context, but add a safeguard here 696 * to return, since if we're in NMI context we can't wait for an NMI 697 * to reset an overflowed counter value. 698 */ 699 if (in_nmi()) 700 return; 701 702 /* 703 * Check each counter for overflow and wait for it to be reset by the 704 * NMI if it has overflowed. This relies on the fact that all active 705 * counters are always enabled when this function is called and 706 * ARCH_PERFMON_EVENTSEL_INT is always set. 707 */ 708 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 709 if (!test_bit(idx, cpuc->active_mask)) 710 continue; 711 712 amd_pmu_wait_on_overflow(idx); 713 } 714 } 715 716 static void amd_pmu_enable_event(struct perf_event *event) 717 { 718 x86_pmu_enable_event(event); 719 } 720 721 static void amd_pmu_enable_all(int added) 722 { 723 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 724 int idx; 725 726 amd_brs_enable_all(); 727 728 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 729 /* only activate events which are marked as active */ 730 if (!test_bit(idx, cpuc->active_mask)) 731 continue; 732 733 amd_pmu_enable_event(cpuc->events[idx]); 734 } 735 } 736 737 static void amd_pmu_v2_enable_event(struct perf_event *event) 738 { 739 struct hw_perf_event *hwc = &event->hw; 740 741 /* 742 * Testing cpu_hw_events.enabled should be skipped in this case unlike 743 * in x86_pmu_enable_event(). 744 * 745 * Since cpu_hw_events.enabled is set only after returning from 746 * x86_pmu_start(), the PMCs must be programmed and kept ready. 747 * Counting starts only after x86_pmu_enable_all() is called. 748 */ 749 __x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE); 750 } 751 752 static __always_inline void amd_pmu_core_enable_all(void) 753 { 754 amd_pmu_set_global_ctl(amd_pmu_global_cntr_mask); 755 } 756 757 static void amd_pmu_v2_enable_all(int added) 758 { 759 amd_pmu_lbr_enable_all(); 760 amd_pmu_core_enable_all(); 761 } 762 763 static void amd_pmu_disable_event(struct perf_event *event) 764 { 765 x86_pmu_disable_event(event); 766 767 /* 768 * This can be called from NMI context (via x86_pmu_stop). The counter 769 * may have overflowed, but either way, we'll never see it get reset 770 * by the NMI if we're already in the NMI. And the NMI latency support 771 * below will take care of any pending NMI that might have been 772 * generated by the overflow. 773 */ 774 if (in_nmi()) 775 return; 776 777 amd_pmu_wait_on_overflow(event->hw.idx); 778 } 779 780 static void amd_pmu_disable_all(void) 781 { 782 amd_brs_disable_all(); 783 x86_pmu_disable_all(); 784 amd_pmu_check_overflow(); 785 } 786 787 static __always_inline void amd_pmu_core_disable_all(void) 788 { 789 amd_pmu_set_global_ctl(0); 790 } 791 792 static void amd_pmu_v2_disable_all(void) 793 { 794 amd_pmu_core_disable_all(); 795 amd_pmu_lbr_disable_all(); 796 amd_pmu_check_overflow(); 797 } 798 799 DEFINE_STATIC_CALL_NULL(amd_pmu_branch_add, *x86_pmu.add); 800 801 static void amd_pmu_add_event(struct perf_event *event) 802 { 803 if (needs_branch_stack(event)) 804 static_call(amd_pmu_branch_add)(event); 805 } 806 807 DEFINE_STATIC_CALL_NULL(amd_pmu_branch_del, *x86_pmu.del); 808 809 static void amd_pmu_del_event(struct perf_event *event) 810 { 811 if (needs_branch_stack(event)) 812 static_call(amd_pmu_branch_del)(event); 813 } 814 815 /* 816 * Because of NMI latency, if multiple PMC counters are active or other sources 817 * of NMIs are received, the perf NMI handler can handle one or more overflowed 818 * PMC counters outside of the NMI associated with the PMC overflow. If the NMI 819 * doesn't arrive at the LAPIC in time to become a pending NMI, then the kernel 820 * back-to-back NMI support won't be active. This PMC handler needs to take into 821 * account that this can occur, otherwise this could result in unknown NMI 822 * messages being issued. Examples of this is PMC overflow while in the NMI 823 * handler when multiple PMCs are active or PMC overflow while handling some 824 * other source of an NMI. 825 * 826 * Attempt to mitigate this by creating an NMI window in which un-handled NMIs 827 * received during this window will be claimed. This prevents extending the 828 * window past when it is possible that latent NMIs should be received. The 829 * per-CPU perf_nmi_tstamp will be set to the window end time whenever perf has 830 * handled a counter. When an un-handled NMI is received, it will be claimed 831 * only if arriving within that window. 832 */ 833 static inline int amd_pmu_adjust_nmi_window(int handled) 834 { 835 /* 836 * If a counter was handled, record a timestamp such that un-handled 837 * NMIs will be claimed if arriving within that window. 838 */ 839 if (handled) { 840 this_cpu_write(perf_nmi_tstamp, jiffies + perf_nmi_window); 841 842 return handled; 843 } 844 845 if (time_after(jiffies, this_cpu_read(perf_nmi_tstamp))) 846 return NMI_DONE; 847 848 return NMI_HANDLED; 849 } 850 851 static int amd_pmu_handle_irq(struct pt_regs *regs) 852 { 853 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 854 int handled; 855 int pmu_enabled; 856 857 /* 858 * Save the PMU state. 859 * It needs to be restored when leaving the handler. 860 */ 861 pmu_enabled = cpuc->enabled; 862 cpuc->enabled = 0; 863 864 amd_brs_disable_all(); 865 866 /* Drain BRS is in use (could be inactive) */ 867 if (cpuc->lbr_users) 868 amd_brs_drain(); 869 870 /* Process any counter overflows */ 871 handled = x86_pmu_handle_irq(regs); 872 873 cpuc->enabled = pmu_enabled; 874 if (pmu_enabled) 875 amd_brs_enable_all(); 876 877 return amd_pmu_adjust_nmi_window(handled); 878 } 879 880 static int amd_pmu_v2_handle_irq(struct pt_regs *regs) 881 { 882 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 883 struct perf_sample_data data; 884 struct hw_perf_event *hwc; 885 struct perf_event *event; 886 int handled = 0, idx; 887 u64 status, mask; 888 bool pmu_enabled; 889 890 /* 891 * Save the PMU state as it needs to be restored when leaving the 892 * handler 893 */ 894 pmu_enabled = cpuc->enabled; 895 cpuc->enabled = 0; 896 897 /* Stop counting but do not disable LBR */ 898 amd_pmu_core_disable_all(); 899 900 status = amd_pmu_get_global_status(); 901 902 /* Check if any overflows are pending */ 903 if (!status) 904 goto done; 905 906 /* Read branch records before unfreezing */ 907 if (status & GLOBAL_STATUS_LBRS_FROZEN) { 908 amd_pmu_lbr_read(); 909 status &= ~GLOBAL_STATUS_LBRS_FROZEN; 910 } 911 912 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 913 if (!test_bit(idx, cpuc->active_mask)) 914 continue; 915 916 event = cpuc->events[idx]; 917 hwc = &event->hw; 918 x86_perf_event_update(event); 919 mask = BIT_ULL(idx); 920 921 if (!(status & mask)) 922 continue; 923 924 /* Event overflow */ 925 handled++; 926 perf_sample_data_init(&data, 0, hwc->last_period); 927 928 if (!x86_perf_event_set_period(event)) 929 continue; 930 931 if (has_branch_stack(event)) { 932 data.br_stack = &cpuc->lbr_stack; 933 data.sample_flags |= PERF_SAMPLE_BRANCH_STACK; 934 } 935 936 if (perf_event_overflow(event, &data, regs)) 937 x86_pmu_stop(event, 0); 938 939 status &= ~mask; 940 } 941 942 /* 943 * It should never be the case that some overflows are not handled as 944 * the corresponding PMCs are expected to be inactive according to the 945 * active_mask 946 */ 947 WARN_ON(status > 0); 948 949 /* Clear overflow and freeze bits */ 950 amd_pmu_ack_global_status(~status); 951 952 /* 953 * Unmasking the LVTPC is not required as the Mask (M) bit of the LVT 954 * PMI entry is not set by the local APIC when a PMC overflow occurs 955 */ 956 inc_irq_stat(apic_perf_irqs); 957 958 done: 959 cpuc->enabled = pmu_enabled; 960 961 /* Resume counting only if PMU is active */ 962 if (pmu_enabled) 963 amd_pmu_core_enable_all(); 964 965 return amd_pmu_adjust_nmi_window(handled); 966 } 967 968 static struct event_constraint * 969 amd_get_event_constraints(struct cpu_hw_events *cpuc, int idx, 970 struct perf_event *event) 971 { 972 /* 973 * if not NB event or no NB, then no constraints 974 */ 975 if (!(amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))) 976 return &unconstrained; 977 978 return __amd_get_nb_event_constraints(cpuc, event, NULL); 979 } 980 981 static void amd_put_event_constraints(struct cpu_hw_events *cpuc, 982 struct perf_event *event) 983 { 984 if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw)) 985 __amd_put_nb_event_constraints(cpuc, event); 986 } 987 988 PMU_FORMAT_ATTR(event, "config:0-7,32-35"); 989 PMU_FORMAT_ATTR(umask, "config:8-15" ); 990 PMU_FORMAT_ATTR(edge, "config:18" ); 991 PMU_FORMAT_ATTR(inv, "config:23" ); 992 PMU_FORMAT_ATTR(cmask, "config:24-31" ); 993 994 static struct attribute *amd_format_attr[] = { 995 &format_attr_event.attr, 996 &format_attr_umask.attr, 997 &format_attr_edge.attr, 998 &format_attr_inv.attr, 999 &format_attr_cmask.attr, 1000 NULL, 1001 }; 1002 1003 /* AMD Family 15h */ 1004 1005 #define AMD_EVENT_TYPE_MASK 0x000000F0ULL 1006 1007 #define AMD_EVENT_FP 0x00000000ULL ... 0x00000010ULL 1008 #define AMD_EVENT_LS 0x00000020ULL ... 0x00000030ULL 1009 #define AMD_EVENT_DC 0x00000040ULL ... 0x00000050ULL 1010 #define AMD_EVENT_CU 0x00000060ULL ... 0x00000070ULL 1011 #define AMD_EVENT_IC_DE 0x00000080ULL ... 0x00000090ULL 1012 #define AMD_EVENT_EX_LS 0x000000C0ULL 1013 #define AMD_EVENT_DE 0x000000D0ULL 1014 #define AMD_EVENT_NB 0x000000E0ULL ... 0x000000F0ULL 1015 1016 /* 1017 * AMD family 15h event code/PMC mappings: 1018 * 1019 * type = event_code & 0x0F0: 1020 * 1021 * 0x000 FP PERF_CTL[5:3] 1022 * 0x010 FP PERF_CTL[5:3] 1023 * 0x020 LS PERF_CTL[5:0] 1024 * 0x030 LS PERF_CTL[5:0] 1025 * 0x040 DC PERF_CTL[5:0] 1026 * 0x050 DC PERF_CTL[5:0] 1027 * 0x060 CU PERF_CTL[2:0] 1028 * 0x070 CU PERF_CTL[2:0] 1029 * 0x080 IC/DE PERF_CTL[2:0] 1030 * 0x090 IC/DE PERF_CTL[2:0] 1031 * 0x0A0 --- 1032 * 0x0B0 --- 1033 * 0x0C0 EX/LS PERF_CTL[5:0] 1034 * 0x0D0 DE PERF_CTL[2:0] 1035 * 0x0E0 NB NB_PERF_CTL[3:0] 1036 * 0x0F0 NB NB_PERF_CTL[3:0] 1037 * 1038 * Exceptions: 1039 * 1040 * 0x000 FP PERF_CTL[3], PERF_CTL[5:3] (*) 1041 * 0x003 FP PERF_CTL[3] 1042 * 0x004 FP PERF_CTL[3], PERF_CTL[5:3] (*) 1043 * 0x00B FP PERF_CTL[3] 1044 * 0x00D FP PERF_CTL[3] 1045 * 0x023 DE PERF_CTL[2:0] 1046 * 0x02D LS PERF_CTL[3] 1047 * 0x02E LS PERF_CTL[3,0] 1048 * 0x031 LS PERF_CTL[2:0] (**) 1049 * 0x043 CU PERF_CTL[2:0] 1050 * 0x045 CU PERF_CTL[2:0] 1051 * 0x046 CU PERF_CTL[2:0] 1052 * 0x054 CU PERF_CTL[2:0] 1053 * 0x055 CU PERF_CTL[2:0] 1054 * 0x08F IC PERF_CTL[0] 1055 * 0x187 DE PERF_CTL[0] 1056 * 0x188 DE PERF_CTL[0] 1057 * 0x0DB EX PERF_CTL[5:0] 1058 * 0x0DC LS PERF_CTL[5:0] 1059 * 0x0DD LS PERF_CTL[5:0] 1060 * 0x0DE LS PERF_CTL[5:0] 1061 * 0x0DF LS PERF_CTL[5:0] 1062 * 0x1C0 EX PERF_CTL[5:3] 1063 * 0x1D6 EX PERF_CTL[5:0] 1064 * 0x1D8 EX PERF_CTL[5:0] 1065 * 1066 * (*) depending on the umask all FPU counters may be used 1067 * (**) only one unitmask enabled at a time 1068 */ 1069 1070 static struct event_constraint amd_f15_PMC0 = EVENT_CONSTRAINT(0, 0x01, 0); 1071 static struct event_constraint amd_f15_PMC20 = EVENT_CONSTRAINT(0, 0x07, 0); 1072 static struct event_constraint amd_f15_PMC3 = EVENT_CONSTRAINT(0, 0x08, 0); 1073 static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0); 1074 static struct event_constraint amd_f15_PMC50 = EVENT_CONSTRAINT(0, 0x3F, 0); 1075 static struct event_constraint amd_f15_PMC53 = EVENT_CONSTRAINT(0, 0x38, 0); 1076 1077 static struct event_constraint * 1078 amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, int idx, 1079 struct perf_event *event) 1080 { 1081 struct hw_perf_event *hwc = &event->hw; 1082 unsigned int event_code = amd_get_event_code(hwc); 1083 1084 switch (event_code & AMD_EVENT_TYPE_MASK) { 1085 case AMD_EVENT_FP: 1086 switch (event_code) { 1087 case 0x000: 1088 if (!(hwc->config & 0x0000F000ULL)) 1089 break; 1090 if (!(hwc->config & 0x00000F00ULL)) 1091 break; 1092 return &amd_f15_PMC3; 1093 case 0x004: 1094 if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) 1095 break; 1096 return &amd_f15_PMC3; 1097 case 0x003: 1098 case 0x00B: 1099 case 0x00D: 1100 return &amd_f15_PMC3; 1101 } 1102 return &amd_f15_PMC53; 1103 case AMD_EVENT_LS: 1104 case AMD_EVENT_DC: 1105 case AMD_EVENT_EX_LS: 1106 switch (event_code) { 1107 case 0x023: 1108 case 0x043: 1109 case 0x045: 1110 case 0x046: 1111 case 0x054: 1112 case 0x055: 1113 return &amd_f15_PMC20; 1114 case 0x02D: 1115 return &amd_f15_PMC3; 1116 case 0x02E: 1117 return &amd_f15_PMC30; 1118 case 0x031: 1119 if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) 1120 return &amd_f15_PMC20; 1121 return &emptyconstraint; 1122 case 0x1C0: 1123 return &amd_f15_PMC53; 1124 default: 1125 return &amd_f15_PMC50; 1126 } 1127 case AMD_EVENT_CU: 1128 case AMD_EVENT_IC_DE: 1129 case AMD_EVENT_DE: 1130 switch (event_code) { 1131 case 0x08F: 1132 case 0x187: 1133 case 0x188: 1134 return &amd_f15_PMC0; 1135 case 0x0DB ... 0x0DF: 1136 case 0x1D6: 1137 case 0x1D8: 1138 return &amd_f15_PMC50; 1139 default: 1140 return &amd_f15_PMC20; 1141 } 1142 case AMD_EVENT_NB: 1143 /* moved to uncore.c */ 1144 return &emptyconstraint; 1145 default: 1146 return &emptyconstraint; 1147 } 1148 } 1149 1150 static struct event_constraint pair_constraint; 1151 1152 static struct event_constraint * 1153 amd_get_event_constraints_f17h(struct cpu_hw_events *cpuc, int idx, 1154 struct perf_event *event) 1155 { 1156 struct hw_perf_event *hwc = &event->hw; 1157 1158 if (amd_is_pair_event_code(hwc)) 1159 return &pair_constraint; 1160 1161 return &unconstrained; 1162 } 1163 1164 static void amd_put_event_constraints_f17h(struct cpu_hw_events *cpuc, 1165 struct perf_event *event) 1166 { 1167 struct hw_perf_event *hwc = &event->hw; 1168 1169 if (is_counter_pair(hwc)) 1170 --cpuc->n_pair; 1171 } 1172 1173 /* 1174 * Because of the way BRS operates with an inactive and active phases, and 1175 * the link to one counter, it is not possible to have two events using BRS 1176 * scheduled at the same time. There would be an issue with enforcing the 1177 * period of each one and given that the BRS saturates, it would not be possible 1178 * to guarantee correlated content for all events. Therefore, in situations 1179 * where multiple events want to use BRS, the kernel enforces mutual exclusion. 1180 * Exclusion is enforced by chosing only one counter for events using BRS. 1181 * The event scheduling logic will then automatically multiplex the 1182 * events and ensure that at most one event is actively using BRS. 1183 * 1184 * The BRS counter could be any counter, but there is no constraint on Fam19h, 1185 * therefore all counters are equal and thus we pick the first one: PMC0 1186 */ 1187 static struct event_constraint amd_fam19h_brs_cntr0_constraint = 1188 EVENT_CONSTRAINT(0, 0x1, AMD64_RAW_EVENT_MASK); 1189 1190 static struct event_constraint amd_fam19h_brs_pair_cntr0_constraint = 1191 __EVENT_CONSTRAINT(0, 0x1, AMD64_RAW_EVENT_MASK, 1, 0, PERF_X86_EVENT_PAIR); 1192 1193 static struct event_constraint * 1194 amd_get_event_constraints_f19h(struct cpu_hw_events *cpuc, int idx, 1195 struct perf_event *event) 1196 { 1197 struct hw_perf_event *hwc = &event->hw; 1198 bool has_brs = has_amd_brs(hwc); 1199 1200 /* 1201 * In case BRS is used with an event requiring a counter pair, 1202 * the kernel allows it but only on counter 0 & 1 to enforce 1203 * multiplexing requiring to protect BRS in case of multiple 1204 * BRS users 1205 */ 1206 if (amd_is_pair_event_code(hwc)) { 1207 return has_brs ? &amd_fam19h_brs_pair_cntr0_constraint 1208 : &pair_constraint; 1209 } 1210 1211 if (has_brs) 1212 return &amd_fam19h_brs_cntr0_constraint; 1213 1214 return &unconstrained; 1215 } 1216 1217 1218 static ssize_t amd_event_sysfs_show(char *page, u64 config) 1219 { 1220 u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT) | 1221 (config & AMD64_EVENTSEL_EVENT) >> 24; 1222 1223 return x86_event_sysfs_show(page, config, event); 1224 } 1225 1226 static void amd_pmu_limit_period(struct perf_event *event, s64 *left) 1227 { 1228 /* 1229 * Decrease period by the depth of the BRS feature to get the last N 1230 * taken branches and approximate the desired period 1231 */ 1232 if (has_branch_stack(event) && *left > x86_pmu.lbr_nr) 1233 *left -= x86_pmu.lbr_nr; 1234 } 1235 1236 static __initconst const struct x86_pmu amd_pmu = { 1237 .name = "AMD", 1238 .handle_irq = amd_pmu_handle_irq, 1239 .disable_all = amd_pmu_disable_all, 1240 .enable_all = amd_pmu_enable_all, 1241 .enable = amd_pmu_enable_event, 1242 .disable = amd_pmu_disable_event, 1243 .hw_config = amd_pmu_hw_config, 1244 .schedule_events = x86_schedule_events, 1245 .eventsel = MSR_K7_EVNTSEL0, 1246 .perfctr = MSR_K7_PERFCTR0, 1247 .addr_offset = amd_pmu_addr_offset, 1248 .event_map = amd_pmu_event_map, 1249 .max_events = ARRAY_SIZE(amd_perfmon_event_map), 1250 .num_counters = AMD64_NUM_COUNTERS, 1251 .add = amd_pmu_add_event, 1252 .del = amd_pmu_del_event, 1253 .cntval_bits = 48, 1254 .cntval_mask = (1ULL << 48) - 1, 1255 .apic = 1, 1256 /* use highest bit to detect overflow */ 1257 .max_period = (1ULL << 47) - 1, 1258 .get_event_constraints = amd_get_event_constraints, 1259 .put_event_constraints = amd_put_event_constraints, 1260 1261 .format_attrs = amd_format_attr, 1262 .events_sysfs_show = amd_event_sysfs_show, 1263 1264 .cpu_prepare = amd_pmu_cpu_prepare, 1265 .cpu_starting = amd_pmu_cpu_starting, 1266 .cpu_dead = amd_pmu_cpu_dead, 1267 1268 .amd_nb_constraints = 1, 1269 }; 1270 1271 static ssize_t branches_show(struct device *cdev, 1272 struct device_attribute *attr, 1273 char *buf) 1274 { 1275 return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu.lbr_nr); 1276 } 1277 1278 static DEVICE_ATTR_RO(branches); 1279 1280 static struct attribute *amd_pmu_branches_attrs[] = { 1281 &dev_attr_branches.attr, 1282 NULL, 1283 }; 1284 1285 static umode_t 1286 amd_branches_is_visible(struct kobject *kobj, struct attribute *attr, int i) 1287 { 1288 return x86_pmu.lbr_nr ? attr->mode : 0; 1289 } 1290 1291 static struct attribute_group group_caps_amd_branches = { 1292 .name = "caps", 1293 .attrs = amd_pmu_branches_attrs, 1294 .is_visible = amd_branches_is_visible, 1295 }; 1296 1297 #ifdef CONFIG_PERF_EVENTS_AMD_BRS 1298 1299 EVENT_ATTR_STR(branch-brs, amd_branch_brs, 1300 "event=" __stringify(AMD_FAM19H_BRS_EVENT)"\n"); 1301 1302 static struct attribute *amd_brs_events_attrs[] = { 1303 EVENT_PTR(amd_branch_brs), 1304 NULL, 1305 }; 1306 1307 static umode_t 1308 amd_brs_is_visible(struct kobject *kobj, struct attribute *attr, int i) 1309 { 1310 return static_cpu_has(X86_FEATURE_BRS) && x86_pmu.lbr_nr ? 1311 attr->mode : 0; 1312 } 1313 1314 static struct attribute_group group_events_amd_brs = { 1315 .name = "events", 1316 .attrs = amd_brs_events_attrs, 1317 .is_visible = amd_brs_is_visible, 1318 }; 1319 1320 #endif /* CONFIG_PERF_EVENTS_AMD_BRS */ 1321 1322 static const struct attribute_group *amd_attr_update[] = { 1323 &group_caps_amd_branches, 1324 #ifdef CONFIG_PERF_EVENTS_AMD_BRS 1325 &group_events_amd_brs, 1326 #endif 1327 NULL, 1328 }; 1329 1330 static int __init amd_core_pmu_init(void) 1331 { 1332 union cpuid_0x80000022_ebx ebx; 1333 u64 even_ctr_mask = 0ULL; 1334 int i; 1335 1336 if (!boot_cpu_has(X86_FEATURE_PERFCTR_CORE)) 1337 return 0; 1338 1339 /* Avoid calculating the value each time in the NMI handler */ 1340 perf_nmi_window = msecs_to_jiffies(100); 1341 1342 /* 1343 * If core performance counter extensions exists, we must use 1344 * MSR_F15H_PERF_CTL/MSR_F15H_PERF_CTR msrs. See also 1345 * amd_pmu_addr_offset(). 1346 */ 1347 x86_pmu.eventsel = MSR_F15H_PERF_CTL; 1348 x86_pmu.perfctr = MSR_F15H_PERF_CTR; 1349 x86_pmu.num_counters = AMD64_NUM_COUNTERS_CORE; 1350 1351 /* Check for Performance Monitoring v2 support */ 1352 if (boot_cpu_has(X86_FEATURE_PERFMON_V2)) { 1353 ebx.full = cpuid_ebx(EXT_PERFMON_DEBUG_FEATURES); 1354 1355 /* Update PMU version for later usage */ 1356 x86_pmu.version = 2; 1357 1358 /* Find the number of available Core PMCs */ 1359 x86_pmu.num_counters = ebx.split.num_core_pmc; 1360 1361 amd_pmu_global_cntr_mask = (1ULL << x86_pmu.num_counters) - 1; 1362 1363 /* Update PMC handling functions */ 1364 x86_pmu.enable_all = amd_pmu_v2_enable_all; 1365 x86_pmu.disable_all = amd_pmu_v2_disable_all; 1366 x86_pmu.enable = amd_pmu_v2_enable_event; 1367 x86_pmu.handle_irq = amd_pmu_v2_handle_irq; 1368 static_call_update(amd_pmu_test_overflow, amd_pmu_test_overflow_status); 1369 } 1370 1371 /* 1372 * AMD Core perfctr has separate MSRs for the NB events, see 1373 * the amd/uncore.c driver. 1374 */ 1375 x86_pmu.amd_nb_constraints = 0; 1376 1377 if (boot_cpu_data.x86 == 0x15) { 1378 pr_cont("Fam15h "); 1379 x86_pmu.get_event_constraints = amd_get_event_constraints_f15h; 1380 } 1381 if (boot_cpu_data.x86 >= 0x17) { 1382 pr_cont("Fam17h+ "); 1383 /* 1384 * Family 17h and compatibles have constraints for Large 1385 * Increment per Cycle events: they may only be assigned an 1386 * even numbered counter that has a consecutive adjacent odd 1387 * numbered counter following it. 1388 */ 1389 for (i = 0; i < x86_pmu.num_counters - 1; i += 2) 1390 even_ctr_mask |= 1 << i; 1391 1392 pair_constraint = (struct event_constraint) 1393 __EVENT_CONSTRAINT(0, even_ctr_mask, 0, 1394 x86_pmu.num_counters / 2, 0, 1395 PERF_X86_EVENT_PAIR); 1396 1397 x86_pmu.get_event_constraints = amd_get_event_constraints_f17h; 1398 x86_pmu.put_event_constraints = amd_put_event_constraints_f17h; 1399 x86_pmu.perf_ctr_pair_en = AMD_MERGE_EVENT_ENABLE; 1400 x86_pmu.flags |= PMU_FL_PAIR; 1401 } 1402 1403 /* LBR and BRS are mutually exclusive features */ 1404 if (!amd_pmu_lbr_init()) { 1405 /* LBR requires flushing on context switch */ 1406 x86_pmu.sched_task = amd_pmu_lbr_sched_task; 1407 static_call_update(amd_pmu_branch_hw_config, amd_pmu_lbr_hw_config); 1408 static_call_update(amd_pmu_branch_reset, amd_pmu_lbr_reset); 1409 static_call_update(amd_pmu_branch_add, amd_pmu_lbr_add); 1410 static_call_update(amd_pmu_branch_del, amd_pmu_lbr_del); 1411 } else if (!amd_brs_init()) { 1412 /* 1413 * BRS requires special event constraints and flushing on ctxsw. 1414 */ 1415 x86_pmu.get_event_constraints = amd_get_event_constraints_f19h; 1416 x86_pmu.sched_task = amd_pmu_brs_sched_task; 1417 x86_pmu.limit_period = amd_pmu_limit_period; 1418 1419 static_call_update(amd_pmu_branch_hw_config, amd_brs_hw_config); 1420 static_call_update(amd_pmu_branch_reset, amd_brs_reset); 1421 static_call_update(amd_pmu_branch_add, amd_pmu_brs_add); 1422 static_call_update(amd_pmu_branch_del, amd_pmu_brs_del); 1423 1424 /* 1425 * put_event_constraints callback same as Fam17h, set above 1426 */ 1427 1428 /* branch sampling must be stopped when entering low power */ 1429 amd_brs_lopwr_init(); 1430 } 1431 1432 x86_pmu.attr_update = amd_attr_update; 1433 1434 pr_cont("core perfctr, "); 1435 return 0; 1436 } 1437 1438 __init int amd_pmu_init(void) 1439 { 1440 int ret; 1441 1442 /* Performance-monitoring supported from K7 and later: */ 1443 if (boot_cpu_data.x86 < 6) 1444 return -ENODEV; 1445 1446 x86_pmu = amd_pmu; 1447 1448 ret = amd_core_pmu_init(); 1449 if (ret) 1450 return ret; 1451 1452 if (num_possible_cpus() == 1) { 1453 /* 1454 * No point in allocating data structures to serialize 1455 * against other CPUs, when there is only the one CPU. 1456 */ 1457 x86_pmu.amd_nb_constraints = 0; 1458 } 1459 1460 if (boot_cpu_data.x86 >= 0x17) 1461 memcpy(hw_cache_event_ids, amd_hw_cache_event_ids_f17h, sizeof(hw_cache_event_ids)); 1462 else 1463 memcpy(hw_cache_event_ids, amd_hw_cache_event_ids, sizeof(hw_cache_event_ids)); 1464 1465 return 0; 1466 } 1467 1468 static inline void amd_pmu_reload_virt(void) 1469 { 1470 if (x86_pmu.version >= 2) { 1471 /* 1472 * Clear global enable bits, reprogram the PERF_CTL 1473 * registers with updated perf_ctr_virt_mask and then 1474 * set global enable bits once again 1475 */ 1476 amd_pmu_v2_disable_all(); 1477 amd_pmu_enable_all(0); 1478 amd_pmu_v2_enable_all(0); 1479 return; 1480 } 1481 1482 amd_pmu_disable_all(); 1483 amd_pmu_enable_all(0); 1484 } 1485 1486 void amd_pmu_enable_virt(void) 1487 { 1488 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1489 1490 cpuc->perf_ctr_virt_mask = 0; 1491 1492 /* Reload all events */ 1493 amd_pmu_reload_virt(); 1494 } 1495 EXPORT_SYMBOL_GPL(amd_pmu_enable_virt); 1496 1497 void amd_pmu_disable_virt(void) 1498 { 1499 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1500 1501 /* 1502 * We only mask out the Host-only bit so that host-only counting works 1503 * when SVM is disabled. If someone sets up a guest-only counter when 1504 * SVM is disabled the Guest-only bits still gets set and the counter 1505 * will not count anything. 1506 */ 1507 cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY; 1508 1509 /* Reload all events */ 1510 amd_pmu_reload_virt(); 1511 } 1512 EXPORT_SYMBOL_GPL(amd_pmu_disable_virt); 1513