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 forward_event_to_ibs(event); 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 /* 538 * Clear freeze and overflow bits i.e. PerfCntrGLobalStatus.LbrFreeze 539 * and PerfCntrGLobalStatus.PerfCntrOvfl 540 */ 541 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, 542 GLOBAL_STATUS_LBRS_FROZEN | amd_pmu_global_cntr_mask); 543 } 544 545 static int amd_pmu_cpu_prepare(int cpu) 546 { 547 struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); 548 549 cpuc->lbr_sel = kzalloc_node(sizeof(struct er_account), GFP_KERNEL, 550 cpu_to_node(cpu)); 551 if (!cpuc->lbr_sel) 552 return -ENOMEM; 553 554 WARN_ON_ONCE(cpuc->amd_nb); 555 556 if (!x86_pmu.amd_nb_constraints) 557 return 0; 558 559 cpuc->amd_nb = amd_alloc_nb(cpu); 560 if (cpuc->amd_nb) 561 return 0; 562 563 kfree(cpuc->lbr_sel); 564 cpuc->lbr_sel = NULL; 565 566 return -ENOMEM; 567 } 568 569 static void amd_pmu_cpu_starting(int cpu) 570 { 571 struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); 572 void **onln = &cpuc->kfree_on_online[X86_PERF_KFREE_SHARED]; 573 struct amd_nb *nb; 574 int i, nb_id; 575 576 cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY; 577 amd_pmu_cpu_reset(cpu); 578 579 if (!x86_pmu.amd_nb_constraints) 580 return; 581 582 nb_id = topology_amd_node_id(cpu); 583 WARN_ON_ONCE(nb_id == BAD_APICID); 584 585 for_each_online_cpu(i) { 586 nb = per_cpu(cpu_hw_events, i).amd_nb; 587 if (WARN_ON_ONCE(!nb)) 588 continue; 589 590 if (nb->nb_id == nb_id) { 591 *onln = cpuc->amd_nb; 592 cpuc->amd_nb = nb; 593 break; 594 } 595 } 596 597 cpuc->amd_nb->nb_id = nb_id; 598 cpuc->amd_nb->refcnt++; 599 } 600 601 static void amd_pmu_cpu_dead(int cpu) 602 { 603 struct cpu_hw_events *cpuhw = &per_cpu(cpu_hw_events, cpu); 604 605 kfree(cpuhw->lbr_sel); 606 cpuhw->lbr_sel = NULL; 607 608 if (!x86_pmu.amd_nb_constraints) 609 return; 610 611 if (cpuhw->amd_nb) { 612 struct amd_nb *nb = cpuhw->amd_nb; 613 614 if (nb->nb_id == -1 || --nb->refcnt == 0) 615 kfree(nb); 616 617 cpuhw->amd_nb = NULL; 618 } 619 } 620 621 static inline void amd_pmu_set_global_ctl(u64 ctl) 622 { 623 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, ctl); 624 } 625 626 static inline u64 amd_pmu_get_global_status(void) 627 { 628 u64 status; 629 630 /* PerfCntrGlobalStatus is read-only */ 631 rdmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS, status); 632 633 return status; 634 } 635 636 static inline void amd_pmu_ack_global_status(u64 status) 637 { 638 /* 639 * PerfCntrGlobalStatus is read-only but an overflow acknowledgment 640 * mechanism exists; writing 1 to a bit in PerfCntrGlobalStatusClr 641 * clears the same bit in PerfCntrGlobalStatus 642 */ 643 644 wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, status); 645 } 646 647 static bool amd_pmu_test_overflow_topbit(int idx) 648 { 649 u64 counter; 650 651 rdmsrl(x86_pmu_event_addr(idx), counter); 652 653 return !(counter & BIT_ULL(x86_pmu.cntval_bits - 1)); 654 } 655 656 static bool amd_pmu_test_overflow_status(int idx) 657 { 658 return amd_pmu_get_global_status() & BIT_ULL(idx); 659 } 660 661 DEFINE_STATIC_CALL(amd_pmu_test_overflow, amd_pmu_test_overflow_topbit); 662 663 /* 664 * When a PMC counter overflows, an NMI is used to process the event and 665 * reset the counter. NMI latency can result in the counter being updated 666 * before the NMI can run, which can result in what appear to be spurious 667 * NMIs. This function is intended to wait for the NMI to run and reset 668 * the counter to avoid possible unhandled NMI messages. 669 */ 670 #define OVERFLOW_WAIT_COUNT 50 671 672 static void amd_pmu_wait_on_overflow(int idx) 673 { 674 unsigned int i; 675 676 /* 677 * Wait for the counter to be reset if it has overflowed. This loop 678 * should exit very, very quickly, but just in case, don't wait 679 * forever... 680 */ 681 for (i = 0; i < OVERFLOW_WAIT_COUNT; i++) { 682 if (!static_call(amd_pmu_test_overflow)(idx)) 683 break; 684 685 /* Might be in IRQ context, so can't sleep */ 686 udelay(1); 687 } 688 } 689 690 static void amd_pmu_check_overflow(void) 691 { 692 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 693 int idx; 694 695 /* 696 * This shouldn't be called from NMI context, but add a safeguard here 697 * to return, since if we're in NMI context we can't wait for an NMI 698 * to reset an overflowed counter value. 699 */ 700 if (in_nmi()) 701 return; 702 703 /* 704 * Check each counter for overflow and wait for it to be reset by the 705 * NMI if it has overflowed. This relies on the fact that all active 706 * counters are always enabled when this function is called and 707 * ARCH_PERFMON_EVENTSEL_INT is always set. 708 */ 709 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 710 if (!test_bit(idx, cpuc->active_mask)) 711 continue; 712 713 amd_pmu_wait_on_overflow(idx); 714 } 715 } 716 717 static void amd_pmu_enable_event(struct perf_event *event) 718 { 719 x86_pmu_enable_event(event); 720 } 721 722 static void amd_pmu_enable_all(int added) 723 { 724 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 725 int idx; 726 727 amd_brs_enable_all(); 728 729 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 730 /* only activate events which are marked as active */ 731 if (!test_bit(idx, cpuc->active_mask)) 732 continue; 733 734 amd_pmu_enable_event(cpuc->events[idx]); 735 } 736 } 737 738 static void amd_pmu_v2_enable_event(struct perf_event *event) 739 { 740 struct hw_perf_event *hwc = &event->hw; 741 742 /* 743 * Testing cpu_hw_events.enabled should be skipped in this case unlike 744 * in x86_pmu_enable_event(). 745 * 746 * Since cpu_hw_events.enabled is set only after returning from 747 * x86_pmu_start(), the PMCs must be programmed and kept ready. 748 * Counting starts only after x86_pmu_enable_all() is called. 749 */ 750 __x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE); 751 } 752 753 static __always_inline void amd_pmu_core_enable_all(void) 754 { 755 amd_pmu_set_global_ctl(amd_pmu_global_cntr_mask); 756 } 757 758 static void amd_pmu_v2_enable_all(int added) 759 { 760 amd_pmu_lbr_enable_all(); 761 amd_pmu_core_enable_all(); 762 } 763 764 static void amd_pmu_disable_event(struct perf_event *event) 765 { 766 x86_pmu_disable_event(event); 767 768 /* 769 * This can be called from NMI context (via x86_pmu_stop). The counter 770 * may have overflowed, but either way, we'll never see it get reset 771 * by the NMI if we're already in the NMI. And the NMI latency support 772 * below will take care of any pending NMI that might have been 773 * generated by the overflow. 774 */ 775 if (in_nmi()) 776 return; 777 778 amd_pmu_wait_on_overflow(event->hw.idx); 779 } 780 781 static void amd_pmu_disable_all(void) 782 { 783 amd_brs_disable_all(); 784 x86_pmu_disable_all(); 785 amd_pmu_check_overflow(); 786 } 787 788 static __always_inline void amd_pmu_core_disable_all(void) 789 { 790 amd_pmu_set_global_ctl(0); 791 } 792 793 static void amd_pmu_v2_disable_all(void) 794 { 795 amd_pmu_core_disable_all(); 796 amd_pmu_lbr_disable_all(); 797 amd_pmu_check_overflow(); 798 } 799 800 DEFINE_STATIC_CALL_NULL(amd_pmu_branch_add, *x86_pmu.add); 801 802 static void amd_pmu_add_event(struct perf_event *event) 803 { 804 if (needs_branch_stack(event)) 805 static_call(amd_pmu_branch_add)(event); 806 } 807 808 DEFINE_STATIC_CALL_NULL(amd_pmu_branch_del, *x86_pmu.del); 809 810 static void amd_pmu_del_event(struct perf_event *event) 811 { 812 if (needs_branch_stack(event)) 813 static_call(amd_pmu_branch_del)(event); 814 } 815 816 /* 817 * Because of NMI latency, if multiple PMC counters are active or other sources 818 * of NMIs are received, the perf NMI handler can handle one or more overflowed 819 * PMC counters outside of the NMI associated with the PMC overflow. If the NMI 820 * doesn't arrive at the LAPIC in time to become a pending NMI, then the kernel 821 * back-to-back NMI support won't be active. This PMC handler needs to take into 822 * account that this can occur, otherwise this could result in unknown NMI 823 * messages being issued. Examples of this is PMC overflow while in the NMI 824 * handler when multiple PMCs are active or PMC overflow while handling some 825 * other source of an NMI. 826 * 827 * Attempt to mitigate this by creating an NMI window in which un-handled NMIs 828 * received during this window will be claimed. This prevents extending the 829 * window past when it is possible that latent NMIs should be received. The 830 * per-CPU perf_nmi_tstamp will be set to the window end time whenever perf has 831 * handled a counter. When an un-handled NMI is received, it will be claimed 832 * only if arriving within that window. 833 */ 834 static inline int amd_pmu_adjust_nmi_window(int handled) 835 { 836 /* 837 * If a counter was handled, record a timestamp such that un-handled 838 * NMIs will be claimed if arriving within that window. 839 */ 840 if (handled) { 841 this_cpu_write(perf_nmi_tstamp, jiffies + perf_nmi_window); 842 843 return handled; 844 } 845 846 if (time_after(jiffies, this_cpu_read(perf_nmi_tstamp))) 847 return NMI_DONE; 848 849 return NMI_HANDLED; 850 } 851 852 static int amd_pmu_handle_irq(struct pt_regs *regs) 853 { 854 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 855 int handled; 856 int pmu_enabled; 857 858 /* 859 * Save the PMU state. 860 * It needs to be restored when leaving the handler. 861 */ 862 pmu_enabled = cpuc->enabled; 863 cpuc->enabled = 0; 864 865 amd_brs_disable_all(); 866 867 /* Drain BRS is in use (could be inactive) */ 868 if (cpuc->lbr_users) 869 amd_brs_drain(); 870 871 /* Process any counter overflows */ 872 handled = x86_pmu_handle_irq(regs); 873 874 cpuc->enabled = pmu_enabled; 875 if (pmu_enabled) 876 amd_brs_enable_all(); 877 878 return amd_pmu_adjust_nmi_window(handled); 879 } 880 881 static int amd_pmu_v2_handle_irq(struct pt_regs *regs) 882 { 883 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 884 struct perf_sample_data data; 885 struct hw_perf_event *hwc; 886 struct perf_event *event; 887 int handled = 0, idx; 888 u64 reserved, status, mask; 889 bool pmu_enabled; 890 891 /* 892 * Save the PMU state as it needs to be restored when leaving the 893 * handler 894 */ 895 pmu_enabled = cpuc->enabled; 896 cpuc->enabled = 0; 897 898 /* Stop counting but do not disable LBR */ 899 amd_pmu_core_disable_all(); 900 901 status = amd_pmu_get_global_status(); 902 903 /* Check if any overflows are pending */ 904 if (!status) 905 goto done; 906 907 /* Read branch records before unfreezing */ 908 if (status & GLOBAL_STATUS_LBRS_FROZEN) { 909 amd_pmu_lbr_read(); 910 status &= ~GLOBAL_STATUS_LBRS_FROZEN; 911 } 912 913 reserved = status & ~amd_pmu_global_cntr_mask; 914 if (reserved) 915 pr_warn_once("Reserved PerfCntrGlobalStatus bits are set (0x%llx), please consider updating microcode\n", 916 reserved); 917 918 /* Clear any reserved bits set by buggy microcode */ 919 status &= amd_pmu_global_cntr_mask; 920 921 for (idx = 0; idx < x86_pmu.num_counters; idx++) { 922 if (!test_bit(idx, cpuc->active_mask)) 923 continue; 924 925 event = cpuc->events[idx]; 926 hwc = &event->hw; 927 x86_perf_event_update(event); 928 mask = BIT_ULL(idx); 929 930 if (!(status & mask)) 931 continue; 932 933 /* Event overflow */ 934 handled++; 935 status &= ~mask; 936 perf_sample_data_init(&data, 0, hwc->last_period); 937 938 if (!x86_perf_event_set_period(event)) 939 continue; 940 941 if (has_branch_stack(event)) 942 perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL); 943 944 if (perf_event_overflow(event, &data, regs)) 945 x86_pmu_stop(event, 0); 946 } 947 948 /* 949 * It should never be the case that some overflows are not handled as 950 * the corresponding PMCs are expected to be inactive according to the 951 * active_mask 952 */ 953 WARN_ON(status > 0); 954 955 /* Clear overflow and freeze bits */ 956 amd_pmu_ack_global_status(~status); 957 958 /* 959 * Unmasking the LVTPC is not required as the Mask (M) bit of the LVT 960 * PMI entry is not set by the local APIC when a PMC overflow occurs 961 */ 962 inc_irq_stat(apic_perf_irqs); 963 964 done: 965 cpuc->enabled = pmu_enabled; 966 967 /* Resume counting only if PMU is active */ 968 if (pmu_enabled) 969 amd_pmu_core_enable_all(); 970 971 return amd_pmu_adjust_nmi_window(handled); 972 } 973 974 static struct event_constraint * 975 amd_get_event_constraints(struct cpu_hw_events *cpuc, int idx, 976 struct perf_event *event) 977 { 978 /* 979 * if not NB event or no NB, then no constraints 980 */ 981 if (!(amd_has_nb(cpuc) && amd_is_nb_event(&event->hw))) 982 return &unconstrained; 983 984 return __amd_get_nb_event_constraints(cpuc, event, NULL); 985 } 986 987 static void amd_put_event_constraints(struct cpu_hw_events *cpuc, 988 struct perf_event *event) 989 { 990 if (amd_has_nb(cpuc) && amd_is_nb_event(&event->hw)) 991 __amd_put_nb_event_constraints(cpuc, event); 992 } 993 994 PMU_FORMAT_ATTR(event, "config:0-7,32-35"); 995 PMU_FORMAT_ATTR(umask, "config:8-15" ); 996 PMU_FORMAT_ATTR(edge, "config:18" ); 997 PMU_FORMAT_ATTR(inv, "config:23" ); 998 PMU_FORMAT_ATTR(cmask, "config:24-31" ); 999 1000 static struct attribute *amd_format_attr[] = { 1001 &format_attr_event.attr, 1002 &format_attr_umask.attr, 1003 &format_attr_edge.attr, 1004 &format_attr_inv.attr, 1005 &format_attr_cmask.attr, 1006 NULL, 1007 }; 1008 1009 /* AMD Family 15h */ 1010 1011 #define AMD_EVENT_TYPE_MASK 0x000000F0ULL 1012 1013 #define AMD_EVENT_FP 0x00000000ULL ... 0x00000010ULL 1014 #define AMD_EVENT_LS 0x00000020ULL ... 0x00000030ULL 1015 #define AMD_EVENT_DC 0x00000040ULL ... 0x00000050ULL 1016 #define AMD_EVENT_CU 0x00000060ULL ... 0x00000070ULL 1017 #define AMD_EVENT_IC_DE 0x00000080ULL ... 0x00000090ULL 1018 #define AMD_EVENT_EX_LS 0x000000C0ULL 1019 #define AMD_EVENT_DE 0x000000D0ULL 1020 #define AMD_EVENT_NB 0x000000E0ULL ... 0x000000F0ULL 1021 1022 /* 1023 * AMD family 15h event code/PMC mappings: 1024 * 1025 * type = event_code & 0x0F0: 1026 * 1027 * 0x000 FP PERF_CTL[5:3] 1028 * 0x010 FP PERF_CTL[5:3] 1029 * 0x020 LS PERF_CTL[5:0] 1030 * 0x030 LS PERF_CTL[5:0] 1031 * 0x040 DC PERF_CTL[5:0] 1032 * 0x050 DC PERF_CTL[5:0] 1033 * 0x060 CU PERF_CTL[2:0] 1034 * 0x070 CU PERF_CTL[2:0] 1035 * 0x080 IC/DE PERF_CTL[2:0] 1036 * 0x090 IC/DE PERF_CTL[2:0] 1037 * 0x0A0 --- 1038 * 0x0B0 --- 1039 * 0x0C0 EX/LS PERF_CTL[5:0] 1040 * 0x0D0 DE PERF_CTL[2:0] 1041 * 0x0E0 NB NB_PERF_CTL[3:0] 1042 * 0x0F0 NB NB_PERF_CTL[3:0] 1043 * 1044 * Exceptions: 1045 * 1046 * 0x000 FP PERF_CTL[3], PERF_CTL[5:3] (*) 1047 * 0x003 FP PERF_CTL[3] 1048 * 0x004 FP PERF_CTL[3], PERF_CTL[5:3] (*) 1049 * 0x00B FP PERF_CTL[3] 1050 * 0x00D FP PERF_CTL[3] 1051 * 0x023 DE PERF_CTL[2:0] 1052 * 0x02D LS PERF_CTL[3] 1053 * 0x02E LS PERF_CTL[3,0] 1054 * 0x031 LS PERF_CTL[2:0] (**) 1055 * 0x043 CU PERF_CTL[2:0] 1056 * 0x045 CU PERF_CTL[2:0] 1057 * 0x046 CU PERF_CTL[2:0] 1058 * 0x054 CU PERF_CTL[2:0] 1059 * 0x055 CU PERF_CTL[2:0] 1060 * 0x08F IC PERF_CTL[0] 1061 * 0x187 DE PERF_CTL[0] 1062 * 0x188 DE PERF_CTL[0] 1063 * 0x0DB EX PERF_CTL[5:0] 1064 * 0x0DC LS PERF_CTL[5:0] 1065 * 0x0DD LS PERF_CTL[5:0] 1066 * 0x0DE LS PERF_CTL[5:0] 1067 * 0x0DF LS PERF_CTL[5:0] 1068 * 0x1C0 EX PERF_CTL[5:3] 1069 * 0x1D6 EX PERF_CTL[5:0] 1070 * 0x1D8 EX PERF_CTL[5:0] 1071 * 1072 * (*) depending on the umask all FPU counters may be used 1073 * (**) only one unitmask enabled at a time 1074 */ 1075 1076 static struct event_constraint amd_f15_PMC0 = EVENT_CONSTRAINT(0, 0x01, 0); 1077 static struct event_constraint amd_f15_PMC20 = EVENT_CONSTRAINT(0, 0x07, 0); 1078 static struct event_constraint amd_f15_PMC3 = EVENT_CONSTRAINT(0, 0x08, 0); 1079 static struct event_constraint amd_f15_PMC30 = EVENT_CONSTRAINT_OVERLAP(0, 0x09, 0); 1080 static struct event_constraint amd_f15_PMC50 = EVENT_CONSTRAINT(0, 0x3F, 0); 1081 static struct event_constraint amd_f15_PMC53 = EVENT_CONSTRAINT(0, 0x38, 0); 1082 1083 static struct event_constraint * 1084 amd_get_event_constraints_f15h(struct cpu_hw_events *cpuc, int idx, 1085 struct perf_event *event) 1086 { 1087 struct hw_perf_event *hwc = &event->hw; 1088 unsigned int event_code = amd_get_event_code(hwc); 1089 1090 switch (event_code & AMD_EVENT_TYPE_MASK) { 1091 case AMD_EVENT_FP: 1092 switch (event_code) { 1093 case 0x000: 1094 if (!(hwc->config & 0x0000F000ULL)) 1095 break; 1096 if (!(hwc->config & 0x00000F00ULL)) 1097 break; 1098 return &amd_f15_PMC3; 1099 case 0x004: 1100 if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) 1101 break; 1102 return &amd_f15_PMC3; 1103 case 0x003: 1104 case 0x00B: 1105 case 0x00D: 1106 return &amd_f15_PMC3; 1107 } 1108 return &amd_f15_PMC53; 1109 case AMD_EVENT_LS: 1110 case AMD_EVENT_DC: 1111 case AMD_EVENT_EX_LS: 1112 switch (event_code) { 1113 case 0x023: 1114 case 0x043: 1115 case 0x045: 1116 case 0x046: 1117 case 0x054: 1118 case 0x055: 1119 return &amd_f15_PMC20; 1120 case 0x02D: 1121 return &amd_f15_PMC3; 1122 case 0x02E: 1123 return &amd_f15_PMC30; 1124 case 0x031: 1125 if (hweight_long(hwc->config & ARCH_PERFMON_EVENTSEL_UMASK) <= 1) 1126 return &amd_f15_PMC20; 1127 return &emptyconstraint; 1128 case 0x1C0: 1129 return &amd_f15_PMC53; 1130 default: 1131 return &amd_f15_PMC50; 1132 } 1133 case AMD_EVENT_CU: 1134 case AMD_EVENT_IC_DE: 1135 case AMD_EVENT_DE: 1136 switch (event_code) { 1137 case 0x08F: 1138 case 0x187: 1139 case 0x188: 1140 return &amd_f15_PMC0; 1141 case 0x0DB ... 0x0DF: 1142 case 0x1D6: 1143 case 0x1D8: 1144 return &amd_f15_PMC50; 1145 default: 1146 return &amd_f15_PMC20; 1147 } 1148 case AMD_EVENT_NB: 1149 /* moved to uncore.c */ 1150 return &emptyconstraint; 1151 default: 1152 return &emptyconstraint; 1153 } 1154 } 1155 1156 static struct event_constraint pair_constraint; 1157 1158 static struct event_constraint * 1159 amd_get_event_constraints_f17h(struct cpu_hw_events *cpuc, int idx, 1160 struct perf_event *event) 1161 { 1162 struct hw_perf_event *hwc = &event->hw; 1163 1164 if (amd_is_pair_event_code(hwc)) 1165 return &pair_constraint; 1166 1167 return &unconstrained; 1168 } 1169 1170 static void amd_put_event_constraints_f17h(struct cpu_hw_events *cpuc, 1171 struct perf_event *event) 1172 { 1173 struct hw_perf_event *hwc = &event->hw; 1174 1175 if (is_counter_pair(hwc)) 1176 --cpuc->n_pair; 1177 } 1178 1179 /* 1180 * Because of the way BRS operates with an inactive and active phases, and 1181 * the link to one counter, it is not possible to have two events using BRS 1182 * scheduled at the same time. There would be an issue with enforcing the 1183 * period of each one and given that the BRS saturates, it would not be possible 1184 * to guarantee correlated content for all events. Therefore, in situations 1185 * where multiple events want to use BRS, the kernel enforces mutual exclusion. 1186 * Exclusion is enforced by choosing only one counter for events using BRS. 1187 * The event scheduling logic will then automatically multiplex the 1188 * events and ensure that at most one event is actively using BRS. 1189 * 1190 * The BRS counter could be any counter, but there is no constraint on Fam19h, 1191 * therefore all counters are equal and thus we pick the first one: PMC0 1192 */ 1193 static struct event_constraint amd_fam19h_brs_cntr0_constraint = 1194 EVENT_CONSTRAINT(0, 0x1, AMD64_RAW_EVENT_MASK); 1195 1196 static struct event_constraint amd_fam19h_brs_pair_cntr0_constraint = 1197 __EVENT_CONSTRAINT(0, 0x1, AMD64_RAW_EVENT_MASK, 1, 0, PERF_X86_EVENT_PAIR); 1198 1199 static struct event_constraint * 1200 amd_get_event_constraints_f19h(struct cpu_hw_events *cpuc, int idx, 1201 struct perf_event *event) 1202 { 1203 struct hw_perf_event *hwc = &event->hw; 1204 bool has_brs = has_amd_brs(hwc); 1205 1206 /* 1207 * In case BRS is used with an event requiring a counter pair, 1208 * the kernel allows it but only on counter 0 & 1 to enforce 1209 * multiplexing requiring to protect BRS in case of multiple 1210 * BRS users 1211 */ 1212 if (amd_is_pair_event_code(hwc)) { 1213 return has_brs ? &amd_fam19h_brs_pair_cntr0_constraint 1214 : &pair_constraint; 1215 } 1216 1217 if (has_brs) 1218 return &amd_fam19h_brs_cntr0_constraint; 1219 1220 return &unconstrained; 1221 } 1222 1223 1224 static ssize_t amd_event_sysfs_show(char *page, u64 config) 1225 { 1226 u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT) | 1227 (config & AMD64_EVENTSEL_EVENT) >> 24; 1228 1229 return x86_event_sysfs_show(page, config, event); 1230 } 1231 1232 static void amd_pmu_limit_period(struct perf_event *event, s64 *left) 1233 { 1234 /* 1235 * Decrease period by the depth of the BRS feature to get the last N 1236 * taken branches and approximate the desired period 1237 */ 1238 if (has_branch_stack(event) && *left > x86_pmu.lbr_nr) 1239 *left -= x86_pmu.lbr_nr; 1240 } 1241 1242 static __initconst const struct x86_pmu amd_pmu = { 1243 .name = "AMD", 1244 .handle_irq = amd_pmu_handle_irq, 1245 .disable_all = amd_pmu_disable_all, 1246 .enable_all = amd_pmu_enable_all, 1247 .enable = amd_pmu_enable_event, 1248 .disable = amd_pmu_disable_event, 1249 .hw_config = amd_pmu_hw_config, 1250 .schedule_events = x86_schedule_events, 1251 .eventsel = MSR_K7_EVNTSEL0, 1252 .perfctr = MSR_K7_PERFCTR0, 1253 .addr_offset = amd_pmu_addr_offset, 1254 .event_map = amd_pmu_event_map, 1255 .max_events = ARRAY_SIZE(amd_perfmon_event_map), 1256 .num_counters = AMD64_NUM_COUNTERS, 1257 .add = amd_pmu_add_event, 1258 .del = amd_pmu_del_event, 1259 .cntval_bits = 48, 1260 .cntval_mask = (1ULL << 48) - 1, 1261 .apic = 1, 1262 /* use highest bit to detect overflow */ 1263 .max_period = (1ULL << 47) - 1, 1264 .get_event_constraints = amd_get_event_constraints, 1265 .put_event_constraints = amd_put_event_constraints, 1266 1267 .format_attrs = amd_format_attr, 1268 .events_sysfs_show = amd_event_sysfs_show, 1269 1270 .cpu_prepare = amd_pmu_cpu_prepare, 1271 .cpu_starting = amd_pmu_cpu_starting, 1272 .cpu_dead = amd_pmu_cpu_dead, 1273 1274 .amd_nb_constraints = 1, 1275 }; 1276 1277 static ssize_t branches_show(struct device *cdev, 1278 struct device_attribute *attr, 1279 char *buf) 1280 { 1281 return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu.lbr_nr); 1282 } 1283 1284 static DEVICE_ATTR_RO(branches); 1285 1286 static struct attribute *amd_pmu_branches_attrs[] = { 1287 &dev_attr_branches.attr, 1288 NULL, 1289 }; 1290 1291 static umode_t 1292 amd_branches_is_visible(struct kobject *kobj, struct attribute *attr, int i) 1293 { 1294 return x86_pmu.lbr_nr ? attr->mode : 0; 1295 } 1296 1297 static struct attribute_group group_caps_amd_branches = { 1298 .name = "caps", 1299 .attrs = amd_pmu_branches_attrs, 1300 .is_visible = amd_branches_is_visible, 1301 }; 1302 1303 #ifdef CONFIG_PERF_EVENTS_AMD_BRS 1304 1305 EVENT_ATTR_STR(branch-brs, amd_branch_brs, 1306 "event=" __stringify(AMD_FAM19H_BRS_EVENT)"\n"); 1307 1308 static struct attribute *amd_brs_events_attrs[] = { 1309 EVENT_PTR(amd_branch_brs), 1310 NULL, 1311 }; 1312 1313 static umode_t 1314 amd_brs_is_visible(struct kobject *kobj, struct attribute *attr, int i) 1315 { 1316 return static_cpu_has(X86_FEATURE_BRS) && x86_pmu.lbr_nr ? 1317 attr->mode : 0; 1318 } 1319 1320 static struct attribute_group group_events_amd_brs = { 1321 .name = "events", 1322 .attrs = amd_brs_events_attrs, 1323 .is_visible = amd_brs_is_visible, 1324 }; 1325 1326 #endif /* CONFIG_PERF_EVENTS_AMD_BRS */ 1327 1328 static const struct attribute_group *amd_attr_update[] = { 1329 &group_caps_amd_branches, 1330 #ifdef CONFIG_PERF_EVENTS_AMD_BRS 1331 &group_events_amd_brs, 1332 #endif 1333 NULL, 1334 }; 1335 1336 static int __init amd_core_pmu_init(void) 1337 { 1338 union cpuid_0x80000022_ebx ebx; 1339 u64 even_ctr_mask = 0ULL; 1340 int i; 1341 1342 if (!boot_cpu_has(X86_FEATURE_PERFCTR_CORE)) 1343 return 0; 1344 1345 /* Avoid calculating the value each time in the NMI handler */ 1346 perf_nmi_window = msecs_to_jiffies(100); 1347 1348 /* 1349 * If core performance counter extensions exists, we must use 1350 * MSR_F15H_PERF_CTL/MSR_F15H_PERF_CTR msrs. See also 1351 * amd_pmu_addr_offset(). 1352 */ 1353 x86_pmu.eventsel = MSR_F15H_PERF_CTL; 1354 x86_pmu.perfctr = MSR_F15H_PERF_CTR; 1355 x86_pmu.num_counters = AMD64_NUM_COUNTERS_CORE; 1356 1357 /* Check for Performance Monitoring v2 support */ 1358 if (boot_cpu_has(X86_FEATURE_PERFMON_V2)) { 1359 ebx.full = cpuid_ebx(EXT_PERFMON_DEBUG_FEATURES); 1360 1361 /* Update PMU version for later usage */ 1362 x86_pmu.version = 2; 1363 1364 /* Find the number of available Core PMCs */ 1365 x86_pmu.num_counters = ebx.split.num_core_pmc; 1366 1367 amd_pmu_global_cntr_mask = (1ULL << x86_pmu.num_counters) - 1; 1368 1369 /* Update PMC handling functions */ 1370 x86_pmu.enable_all = amd_pmu_v2_enable_all; 1371 x86_pmu.disable_all = amd_pmu_v2_disable_all; 1372 x86_pmu.enable = amd_pmu_v2_enable_event; 1373 x86_pmu.handle_irq = amd_pmu_v2_handle_irq; 1374 static_call_update(amd_pmu_test_overflow, amd_pmu_test_overflow_status); 1375 } 1376 1377 /* 1378 * AMD Core perfctr has separate MSRs for the NB events, see 1379 * the amd/uncore.c driver. 1380 */ 1381 x86_pmu.amd_nb_constraints = 0; 1382 1383 if (boot_cpu_data.x86 == 0x15) { 1384 pr_cont("Fam15h "); 1385 x86_pmu.get_event_constraints = amd_get_event_constraints_f15h; 1386 } 1387 if (boot_cpu_data.x86 >= 0x17) { 1388 pr_cont("Fam17h+ "); 1389 /* 1390 * Family 17h and compatibles have constraints for Large 1391 * Increment per Cycle events: they may only be assigned an 1392 * even numbered counter that has a consecutive adjacent odd 1393 * numbered counter following it. 1394 */ 1395 for (i = 0; i < x86_pmu.num_counters - 1; i += 2) 1396 even_ctr_mask |= BIT_ULL(i); 1397 1398 pair_constraint = (struct event_constraint) 1399 __EVENT_CONSTRAINT(0, even_ctr_mask, 0, 1400 x86_pmu.num_counters / 2, 0, 1401 PERF_X86_EVENT_PAIR); 1402 1403 x86_pmu.get_event_constraints = amd_get_event_constraints_f17h; 1404 x86_pmu.put_event_constraints = amd_put_event_constraints_f17h; 1405 x86_pmu.perf_ctr_pair_en = AMD_MERGE_EVENT_ENABLE; 1406 x86_pmu.flags |= PMU_FL_PAIR; 1407 } 1408 1409 /* LBR and BRS are mutually exclusive features */ 1410 if (!amd_pmu_lbr_init()) { 1411 /* LBR requires flushing on context switch */ 1412 x86_pmu.sched_task = amd_pmu_lbr_sched_task; 1413 static_call_update(amd_pmu_branch_hw_config, amd_pmu_lbr_hw_config); 1414 static_call_update(amd_pmu_branch_reset, amd_pmu_lbr_reset); 1415 static_call_update(amd_pmu_branch_add, amd_pmu_lbr_add); 1416 static_call_update(amd_pmu_branch_del, amd_pmu_lbr_del); 1417 } else if (!amd_brs_init()) { 1418 /* 1419 * BRS requires special event constraints and flushing on ctxsw. 1420 */ 1421 x86_pmu.get_event_constraints = amd_get_event_constraints_f19h; 1422 x86_pmu.sched_task = amd_pmu_brs_sched_task; 1423 x86_pmu.limit_period = amd_pmu_limit_period; 1424 1425 static_call_update(amd_pmu_branch_hw_config, amd_brs_hw_config); 1426 static_call_update(amd_pmu_branch_reset, amd_brs_reset); 1427 static_call_update(amd_pmu_branch_add, amd_pmu_brs_add); 1428 static_call_update(amd_pmu_branch_del, amd_pmu_brs_del); 1429 1430 /* 1431 * put_event_constraints callback same as Fam17h, set above 1432 */ 1433 1434 /* branch sampling must be stopped when entering low power */ 1435 amd_brs_lopwr_init(); 1436 } 1437 1438 x86_pmu.attr_update = amd_attr_update; 1439 1440 pr_cont("core perfctr, "); 1441 return 0; 1442 } 1443 1444 __init int amd_pmu_init(void) 1445 { 1446 int ret; 1447 1448 /* Performance-monitoring supported from K7 and later: */ 1449 if (boot_cpu_data.x86 < 6) 1450 return -ENODEV; 1451 1452 x86_pmu = amd_pmu; 1453 1454 ret = amd_core_pmu_init(); 1455 if (ret) 1456 return ret; 1457 1458 if (num_possible_cpus() == 1) { 1459 /* 1460 * No point in allocating data structures to serialize 1461 * against other CPUs, when there is only the one CPU. 1462 */ 1463 x86_pmu.amd_nb_constraints = 0; 1464 } 1465 1466 if (boot_cpu_data.x86 >= 0x17) 1467 memcpy(hw_cache_event_ids, amd_hw_cache_event_ids_f17h, sizeof(hw_cache_event_ids)); 1468 else 1469 memcpy(hw_cache_event_ids, amd_hw_cache_event_ids, sizeof(hw_cache_event_ids)); 1470 1471 return 0; 1472 } 1473 1474 static inline void amd_pmu_reload_virt(void) 1475 { 1476 if (x86_pmu.version >= 2) { 1477 /* 1478 * Clear global enable bits, reprogram the PERF_CTL 1479 * registers with updated perf_ctr_virt_mask and then 1480 * set global enable bits once again 1481 */ 1482 amd_pmu_v2_disable_all(); 1483 amd_pmu_enable_all(0); 1484 amd_pmu_v2_enable_all(0); 1485 return; 1486 } 1487 1488 amd_pmu_disable_all(); 1489 amd_pmu_enable_all(0); 1490 } 1491 1492 void amd_pmu_enable_virt(void) 1493 { 1494 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1495 1496 cpuc->perf_ctr_virt_mask = 0; 1497 1498 /* Reload all events */ 1499 amd_pmu_reload_virt(); 1500 } 1501 EXPORT_SYMBOL_GPL(amd_pmu_enable_virt); 1502 1503 void amd_pmu_disable_virt(void) 1504 { 1505 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1506 1507 /* 1508 * We only mask out the Host-only bit so that host-only counting works 1509 * when SVM is disabled. If someone sets up a guest-only counter when 1510 * SVM is disabled the Guest-only bits still gets set and the counter 1511 * will not count anything. 1512 */ 1513 cpuc->perf_ctr_virt_mask = AMD64_EVENTSEL_HOSTONLY; 1514 1515 /* Reload all events */ 1516 amd_pmu_reload_virt(); 1517 } 1518 EXPORT_SYMBOL_GPL(amd_pmu_disable_virt); 1519