1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bitops.h> 3 #include <linux/types.h> 4 #include <linux/slab.h> 5 6 #include <asm/cpu_entry_area.h> 7 #include <asm/perf_event.h> 8 #include <asm/tlbflush.h> 9 #include <asm/insn.h> 10 #include <asm/io.h> 11 12 #include "../perf_event.h" 13 14 /* Waste a full page so it can be mapped into the cpu_entry_area */ 15 DEFINE_PER_CPU_PAGE_ALIGNED(struct debug_store, cpu_debug_store); 16 17 /* The size of a BTS record in bytes: */ 18 #define BTS_RECORD_SIZE 24 19 20 #define PEBS_FIXUP_SIZE PAGE_SIZE 21 22 /* 23 * pebs_record_32 for p4 and core not supported 24 25 struct pebs_record_32 { 26 u32 flags, ip; 27 u32 ax, bc, cx, dx; 28 u32 si, di, bp, sp; 29 }; 30 31 */ 32 33 union intel_x86_pebs_dse { 34 u64 val; 35 struct { 36 unsigned int ld_dse:4; 37 unsigned int ld_stlb_miss:1; 38 unsigned int ld_locked:1; 39 unsigned int ld_data_blk:1; 40 unsigned int ld_addr_blk:1; 41 unsigned int ld_reserved:24; 42 }; 43 struct { 44 unsigned int st_l1d_hit:1; 45 unsigned int st_reserved1:3; 46 unsigned int st_stlb_miss:1; 47 unsigned int st_locked:1; 48 unsigned int st_reserved2:26; 49 }; 50 struct { 51 unsigned int st_lat_dse:4; 52 unsigned int st_lat_stlb_miss:1; 53 unsigned int st_lat_locked:1; 54 unsigned int ld_reserved3:26; 55 }; 56 }; 57 58 59 /* 60 * Map PEBS Load Latency Data Source encodings to generic 61 * memory data source information 62 */ 63 #define P(a, b) PERF_MEM_S(a, b) 64 #define OP_LH (P(OP, LOAD) | P(LVL, HIT)) 65 #define LEVEL(x) P(LVLNUM, x) 66 #define REM P(REMOTE, REMOTE) 67 #define SNOOP_NONE_MISS (P(SNOOP, NONE) | P(SNOOP, MISS)) 68 69 /* Version for Sandy Bridge and later */ 70 static u64 pebs_data_source[] = { 71 P(OP, LOAD) | P(LVL, MISS) | LEVEL(L3) | P(SNOOP, NA),/* 0x00:ukn L3 */ 72 OP_LH | P(LVL, L1) | LEVEL(L1) | P(SNOOP, NONE), /* 0x01: L1 local */ 73 OP_LH | P(LVL, LFB) | LEVEL(LFB) | P(SNOOP, NONE), /* 0x02: LFB hit */ 74 OP_LH | P(LVL, L2) | LEVEL(L2) | P(SNOOP, NONE), /* 0x03: L2 hit */ 75 OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, NONE), /* 0x04: L3 hit */ 76 OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, MISS), /* 0x05: L3 hit, snoop miss */ 77 OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, HIT), /* 0x06: L3 hit, snoop hit */ 78 OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, HITM), /* 0x07: L3 hit, snoop hitm */ 79 OP_LH | P(LVL, REM_CCE1) | REM | LEVEL(L3) | P(SNOOP, HIT), /* 0x08: L3 miss snoop hit */ 80 OP_LH | P(LVL, REM_CCE1) | REM | LEVEL(L3) | P(SNOOP, HITM), /* 0x09: L3 miss snoop hitm*/ 81 OP_LH | P(LVL, LOC_RAM) | LEVEL(RAM) | P(SNOOP, HIT), /* 0x0a: L3 miss, shared */ 82 OP_LH | P(LVL, REM_RAM1) | REM | LEVEL(L3) | P(SNOOP, HIT), /* 0x0b: L3 miss, shared */ 83 OP_LH | P(LVL, LOC_RAM) | LEVEL(RAM) | SNOOP_NONE_MISS, /* 0x0c: L3 miss, excl */ 84 OP_LH | P(LVL, REM_RAM1) | LEVEL(RAM) | REM | SNOOP_NONE_MISS, /* 0x0d: L3 miss, excl */ 85 OP_LH | P(LVL, IO) | LEVEL(NA) | P(SNOOP, NONE), /* 0x0e: I/O */ 86 OP_LH | P(LVL, UNC) | LEVEL(NA) | P(SNOOP, NONE), /* 0x0f: uncached */ 87 }; 88 89 /* Patch up minor differences in the bits */ 90 void __init intel_pmu_pebs_data_source_nhm(void) 91 { 92 pebs_data_source[0x05] = OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, HIT); 93 pebs_data_source[0x06] = OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, HITM); 94 pebs_data_source[0x07] = OP_LH | P(LVL, L3) | LEVEL(L3) | P(SNOOP, HITM); 95 } 96 97 void __init intel_pmu_pebs_data_source_skl(bool pmem) 98 { 99 u64 pmem_or_l4 = pmem ? LEVEL(PMEM) : LEVEL(L4); 100 101 pebs_data_source[0x08] = OP_LH | pmem_or_l4 | P(SNOOP, HIT); 102 pebs_data_source[0x09] = OP_LH | pmem_or_l4 | REM | P(SNOOP, HIT); 103 pebs_data_source[0x0b] = OP_LH | LEVEL(RAM) | REM | P(SNOOP, NONE); 104 pebs_data_source[0x0c] = OP_LH | LEVEL(ANY_CACHE) | REM | P(SNOOPX, FWD); 105 pebs_data_source[0x0d] = OP_LH | LEVEL(ANY_CACHE) | REM | P(SNOOP, HITM); 106 } 107 108 static u64 precise_store_data(u64 status) 109 { 110 union intel_x86_pebs_dse dse; 111 u64 val = P(OP, STORE) | P(SNOOP, NA) | P(LVL, L1) | P(TLB, L2); 112 113 dse.val = status; 114 115 /* 116 * bit 4: TLB access 117 * 1 = stored missed 2nd level TLB 118 * 119 * so it either hit the walker or the OS 120 * otherwise hit 2nd level TLB 121 */ 122 if (dse.st_stlb_miss) 123 val |= P(TLB, MISS); 124 else 125 val |= P(TLB, HIT); 126 127 /* 128 * bit 0: hit L1 data cache 129 * if not set, then all we know is that 130 * it missed L1D 131 */ 132 if (dse.st_l1d_hit) 133 val |= P(LVL, HIT); 134 else 135 val |= P(LVL, MISS); 136 137 /* 138 * bit 5: Locked prefix 139 */ 140 if (dse.st_locked) 141 val |= P(LOCK, LOCKED); 142 143 return val; 144 } 145 146 static u64 precise_datala_hsw(struct perf_event *event, u64 status) 147 { 148 union perf_mem_data_src dse; 149 150 dse.val = PERF_MEM_NA; 151 152 if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) 153 dse.mem_op = PERF_MEM_OP_STORE; 154 else if (event->hw.flags & PERF_X86_EVENT_PEBS_LD_HSW) 155 dse.mem_op = PERF_MEM_OP_LOAD; 156 157 /* 158 * L1 info only valid for following events: 159 * 160 * MEM_UOPS_RETIRED.STLB_MISS_STORES 161 * MEM_UOPS_RETIRED.LOCK_STORES 162 * MEM_UOPS_RETIRED.SPLIT_STORES 163 * MEM_UOPS_RETIRED.ALL_STORES 164 */ 165 if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) { 166 if (status & 1) 167 dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_HIT; 168 else 169 dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_MISS; 170 } 171 return dse.val; 172 } 173 174 static u64 load_latency_data(u64 status) 175 { 176 union intel_x86_pebs_dse dse; 177 u64 val; 178 179 dse.val = status; 180 181 /* 182 * use the mapping table for bit 0-3 183 */ 184 val = pebs_data_source[dse.ld_dse]; 185 186 /* 187 * Nehalem models do not support TLB, Lock infos 188 */ 189 if (x86_pmu.pebs_no_tlb) { 190 val |= P(TLB, NA) | P(LOCK, NA); 191 return val; 192 } 193 /* 194 * bit 4: TLB access 195 * 0 = did not miss 2nd level TLB 196 * 1 = missed 2nd level TLB 197 */ 198 if (dse.ld_stlb_miss) 199 val |= P(TLB, MISS) | P(TLB, L2); 200 else 201 val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2); 202 203 /* 204 * bit 5: locked prefix 205 */ 206 if (dse.ld_locked) 207 val |= P(LOCK, LOCKED); 208 209 /* 210 * Ice Lake and earlier models do not support block infos. 211 */ 212 if (!x86_pmu.pebs_block) { 213 val |= P(BLK, NA); 214 return val; 215 } 216 /* 217 * bit 6: load was blocked since its data could not be forwarded 218 * from a preceding store 219 */ 220 if (dse.ld_data_blk) 221 val |= P(BLK, DATA); 222 223 /* 224 * bit 7: load was blocked due to potential address conflict with 225 * a preceding store 226 */ 227 if (dse.ld_addr_blk) 228 val |= P(BLK, ADDR); 229 230 if (!dse.ld_data_blk && !dse.ld_addr_blk) 231 val |= P(BLK, NA); 232 233 return val; 234 } 235 236 static u64 store_latency_data(u64 status) 237 { 238 union intel_x86_pebs_dse dse; 239 u64 val; 240 241 dse.val = status; 242 243 /* 244 * use the mapping table for bit 0-3 245 */ 246 val = pebs_data_source[dse.st_lat_dse]; 247 248 /* 249 * bit 4: TLB access 250 * 0 = did not miss 2nd level TLB 251 * 1 = missed 2nd level TLB 252 */ 253 if (dse.st_lat_stlb_miss) 254 val |= P(TLB, MISS) | P(TLB, L2); 255 else 256 val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2); 257 258 /* 259 * bit 5: locked prefix 260 */ 261 if (dse.st_lat_locked) 262 val |= P(LOCK, LOCKED); 263 264 val |= P(BLK, NA); 265 266 return val; 267 } 268 269 struct pebs_record_core { 270 u64 flags, ip; 271 u64 ax, bx, cx, dx; 272 u64 si, di, bp, sp; 273 u64 r8, r9, r10, r11; 274 u64 r12, r13, r14, r15; 275 }; 276 277 struct pebs_record_nhm { 278 u64 flags, ip; 279 u64 ax, bx, cx, dx; 280 u64 si, di, bp, sp; 281 u64 r8, r9, r10, r11; 282 u64 r12, r13, r14, r15; 283 u64 status, dla, dse, lat; 284 }; 285 286 /* 287 * Same as pebs_record_nhm, with two additional fields. 288 */ 289 struct pebs_record_hsw { 290 u64 flags, ip; 291 u64 ax, bx, cx, dx; 292 u64 si, di, bp, sp; 293 u64 r8, r9, r10, r11; 294 u64 r12, r13, r14, r15; 295 u64 status, dla, dse, lat; 296 u64 real_ip, tsx_tuning; 297 }; 298 299 union hsw_tsx_tuning { 300 struct { 301 u32 cycles_last_block : 32, 302 hle_abort : 1, 303 rtm_abort : 1, 304 instruction_abort : 1, 305 non_instruction_abort : 1, 306 retry : 1, 307 data_conflict : 1, 308 capacity_writes : 1, 309 capacity_reads : 1; 310 }; 311 u64 value; 312 }; 313 314 #define PEBS_HSW_TSX_FLAGS 0xff00000000ULL 315 316 /* Same as HSW, plus TSC */ 317 318 struct pebs_record_skl { 319 u64 flags, ip; 320 u64 ax, bx, cx, dx; 321 u64 si, di, bp, sp; 322 u64 r8, r9, r10, r11; 323 u64 r12, r13, r14, r15; 324 u64 status, dla, dse, lat; 325 u64 real_ip, tsx_tuning; 326 u64 tsc; 327 }; 328 329 void init_debug_store_on_cpu(int cpu) 330 { 331 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 332 333 if (!ds) 334 return; 335 336 wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 337 (u32)((u64)(unsigned long)ds), 338 (u32)((u64)(unsigned long)ds >> 32)); 339 } 340 341 void fini_debug_store_on_cpu(int cpu) 342 { 343 if (!per_cpu(cpu_hw_events, cpu).ds) 344 return; 345 346 wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0); 347 } 348 349 static DEFINE_PER_CPU(void *, insn_buffer); 350 351 static void ds_update_cea(void *cea, void *addr, size_t size, pgprot_t prot) 352 { 353 unsigned long start = (unsigned long)cea; 354 phys_addr_t pa; 355 size_t msz = 0; 356 357 pa = virt_to_phys(addr); 358 359 preempt_disable(); 360 for (; msz < size; msz += PAGE_SIZE, pa += PAGE_SIZE, cea += PAGE_SIZE) 361 cea_set_pte(cea, pa, prot); 362 363 /* 364 * This is a cross-CPU update of the cpu_entry_area, we must shoot down 365 * all TLB entries for it. 366 */ 367 flush_tlb_kernel_range(start, start + size); 368 preempt_enable(); 369 } 370 371 static void ds_clear_cea(void *cea, size_t size) 372 { 373 unsigned long start = (unsigned long)cea; 374 size_t msz = 0; 375 376 preempt_disable(); 377 for (; msz < size; msz += PAGE_SIZE, cea += PAGE_SIZE) 378 cea_set_pte(cea, 0, PAGE_NONE); 379 380 flush_tlb_kernel_range(start, start + size); 381 preempt_enable(); 382 } 383 384 static void *dsalloc_pages(size_t size, gfp_t flags, int cpu) 385 { 386 unsigned int order = get_order(size); 387 int node = cpu_to_node(cpu); 388 struct page *page; 389 390 page = __alloc_pages_node(node, flags | __GFP_ZERO, order); 391 return page ? page_address(page) : NULL; 392 } 393 394 static void dsfree_pages(const void *buffer, size_t size) 395 { 396 if (buffer) 397 free_pages((unsigned long)buffer, get_order(size)); 398 } 399 400 static int alloc_pebs_buffer(int cpu) 401 { 402 struct cpu_hw_events *hwev = per_cpu_ptr(&cpu_hw_events, cpu); 403 struct debug_store *ds = hwev->ds; 404 size_t bsiz = x86_pmu.pebs_buffer_size; 405 int max, node = cpu_to_node(cpu); 406 void *buffer, *insn_buff, *cea; 407 408 if (!x86_pmu.pebs) 409 return 0; 410 411 buffer = dsalloc_pages(bsiz, GFP_KERNEL, cpu); 412 if (unlikely(!buffer)) 413 return -ENOMEM; 414 415 /* 416 * HSW+ already provides us the eventing ip; no need to allocate this 417 * buffer then. 418 */ 419 if (x86_pmu.intel_cap.pebs_format < 2) { 420 insn_buff = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node); 421 if (!insn_buff) { 422 dsfree_pages(buffer, bsiz); 423 return -ENOMEM; 424 } 425 per_cpu(insn_buffer, cpu) = insn_buff; 426 } 427 hwev->ds_pebs_vaddr = buffer; 428 /* Update the cpu entry area mapping */ 429 cea = &get_cpu_entry_area(cpu)->cpu_debug_buffers.pebs_buffer; 430 ds->pebs_buffer_base = (unsigned long) cea; 431 ds_update_cea(cea, buffer, bsiz, PAGE_KERNEL); 432 ds->pebs_index = ds->pebs_buffer_base; 433 max = x86_pmu.pebs_record_size * (bsiz / x86_pmu.pebs_record_size); 434 ds->pebs_absolute_maximum = ds->pebs_buffer_base + max; 435 return 0; 436 } 437 438 static void release_pebs_buffer(int cpu) 439 { 440 struct cpu_hw_events *hwev = per_cpu_ptr(&cpu_hw_events, cpu); 441 void *cea; 442 443 if (!x86_pmu.pebs) 444 return; 445 446 kfree(per_cpu(insn_buffer, cpu)); 447 per_cpu(insn_buffer, cpu) = NULL; 448 449 /* Clear the fixmap */ 450 cea = &get_cpu_entry_area(cpu)->cpu_debug_buffers.pebs_buffer; 451 ds_clear_cea(cea, x86_pmu.pebs_buffer_size); 452 dsfree_pages(hwev->ds_pebs_vaddr, x86_pmu.pebs_buffer_size); 453 hwev->ds_pebs_vaddr = NULL; 454 } 455 456 static int alloc_bts_buffer(int cpu) 457 { 458 struct cpu_hw_events *hwev = per_cpu_ptr(&cpu_hw_events, cpu); 459 struct debug_store *ds = hwev->ds; 460 void *buffer, *cea; 461 int max; 462 463 if (!x86_pmu.bts) 464 return 0; 465 466 buffer = dsalloc_pages(BTS_BUFFER_SIZE, GFP_KERNEL | __GFP_NOWARN, cpu); 467 if (unlikely(!buffer)) { 468 WARN_ONCE(1, "%s: BTS buffer allocation failure\n", __func__); 469 return -ENOMEM; 470 } 471 hwev->ds_bts_vaddr = buffer; 472 /* Update the fixmap */ 473 cea = &get_cpu_entry_area(cpu)->cpu_debug_buffers.bts_buffer; 474 ds->bts_buffer_base = (unsigned long) cea; 475 ds_update_cea(cea, buffer, BTS_BUFFER_SIZE, PAGE_KERNEL); 476 ds->bts_index = ds->bts_buffer_base; 477 max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE; 478 ds->bts_absolute_maximum = ds->bts_buffer_base + 479 max * BTS_RECORD_SIZE; 480 ds->bts_interrupt_threshold = ds->bts_absolute_maximum - 481 (max / 16) * BTS_RECORD_SIZE; 482 return 0; 483 } 484 485 static void release_bts_buffer(int cpu) 486 { 487 struct cpu_hw_events *hwev = per_cpu_ptr(&cpu_hw_events, cpu); 488 void *cea; 489 490 if (!x86_pmu.bts) 491 return; 492 493 /* Clear the fixmap */ 494 cea = &get_cpu_entry_area(cpu)->cpu_debug_buffers.bts_buffer; 495 ds_clear_cea(cea, BTS_BUFFER_SIZE); 496 dsfree_pages(hwev->ds_bts_vaddr, BTS_BUFFER_SIZE); 497 hwev->ds_bts_vaddr = NULL; 498 } 499 500 static int alloc_ds_buffer(int cpu) 501 { 502 struct debug_store *ds = &get_cpu_entry_area(cpu)->cpu_debug_store; 503 504 memset(ds, 0, sizeof(*ds)); 505 per_cpu(cpu_hw_events, cpu).ds = ds; 506 return 0; 507 } 508 509 static void release_ds_buffer(int cpu) 510 { 511 per_cpu(cpu_hw_events, cpu).ds = NULL; 512 } 513 514 void release_ds_buffers(void) 515 { 516 int cpu; 517 518 if (!x86_pmu.bts && !x86_pmu.pebs) 519 return; 520 521 for_each_possible_cpu(cpu) 522 release_ds_buffer(cpu); 523 524 for_each_possible_cpu(cpu) { 525 /* 526 * Again, ignore errors from offline CPUs, they will no longer 527 * observe cpu_hw_events.ds and not program the DS_AREA when 528 * they come up. 529 */ 530 fini_debug_store_on_cpu(cpu); 531 } 532 533 for_each_possible_cpu(cpu) { 534 release_pebs_buffer(cpu); 535 release_bts_buffer(cpu); 536 } 537 } 538 539 void reserve_ds_buffers(void) 540 { 541 int bts_err = 0, pebs_err = 0; 542 int cpu; 543 544 x86_pmu.bts_active = 0; 545 x86_pmu.pebs_active = 0; 546 547 if (!x86_pmu.bts && !x86_pmu.pebs) 548 return; 549 550 if (!x86_pmu.bts) 551 bts_err = 1; 552 553 if (!x86_pmu.pebs) 554 pebs_err = 1; 555 556 for_each_possible_cpu(cpu) { 557 if (alloc_ds_buffer(cpu)) { 558 bts_err = 1; 559 pebs_err = 1; 560 } 561 562 if (!bts_err && alloc_bts_buffer(cpu)) 563 bts_err = 1; 564 565 if (!pebs_err && alloc_pebs_buffer(cpu)) 566 pebs_err = 1; 567 568 if (bts_err && pebs_err) 569 break; 570 } 571 572 if (bts_err) { 573 for_each_possible_cpu(cpu) 574 release_bts_buffer(cpu); 575 } 576 577 if (pebs_err) { 578 for_each_possible_cpu(cpu) 579 release_pebs_buffer(cpu); 580 } 581 582 if (bts_err && pebs_err) { 583 for_each_possible_cpu(cpu) 584 release_ds_buffer(cpu); 585 } else { 586 if (x86_pmu.bts && !bts_err) 587 x86_pmu.bts_active = 1; 588 589 if (x86_pmu.pebs && !pebs_err) 590 x86_pmu.pebs_active = 1; 591 592 for_each_possible_cpu(cpu) { 593 /* 594 * Ignores wrmsr_on_cpu() errors for offline CPUs they 595 * will get this call through intel_pmu_cpu_starting(). 596 */ 597 init_debug_store_on_cpu(cpu); 598 } 599 } 600 } 601 602 /* 603 * BTS 604 */ 605 606 struct event_constraint bts_constraint = 607 EVENT_CONSTRAINT(0, 1ULL << INTEL_PMC_IDX_FIXED_BTS, 0); 608 609 void intel_pmu_enable_bts(u64 config) 610 { 611 unsigned long debugctlmsr; 612 613 debugctlmsr = get_debugctlmsr(); 614 615 debugctlmsr |= DEBUGCTLMSR_TR; 616 debugctlmsr |= DEBUGCTLMSR_BTS; 617 if (config & ARCH_PERFMON_EVENTSEL_INT) 618 debugctlmsr |= DEBUGCTLMSR_BTINT; 619 620 if (!(config & ARCH_PERFMON_EVENTSEL_OS)) 621 debugctlmsr |= DEBUGCTLMSR_BTS_OFF_OS; 622 623 if (!(config & ARCH_PERFMON_EVENTSEL_USR)) 624 debugctlmsr |= DEBUGCTLMSR_BTS_OFF_USR; 625 626 update_debugctlmsr(debugctlmsr); 627 } 628 629 void intel_pmu_disable_bts(void) 630 { 631 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 632 unsigned long debugctlmsr; 633 634 if (!cpuc->ds) 635 return; 636 637 debugctlmsr = get_debugctlmsr(); 638 639 debugctlmsr &= 640 ~(DEBUGCTLMSR_TR | DEBUGCTLMSR_BTS | DEBUGCTLMSR_BTINT | 641 DEBUGCTLMSR_BTS_OFF_OS | DEBUGCTLMSR_BTS_OFF_USR); 642 643 update_debugctlmsr(debugctlmsr); 644 } 645 646 int intel_pmu_drain_bts_buffer(void) 647 { 648 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 649 struct debug_store *ds = cpuc->ds; 650 struct bts_record { 651 u64 from; 652 u64 to; 653 u64 flags; 654 }; 655 struct perf_event *event = cpuc->events[INTEL_PMC_IDX_FIXED_BTS]; 656 struct bts_record *at, *base, *top; 657 struct perf_output_handle handle; 658 struct perf_event_header header; 659 struct perf_sample_data data; 660 unsigned long skip = 0; 661 struct pt_regs regs; 662 663 if (!event) 664 return 0; 665 666 if (!x86_pmu.bts_active) 667 return 0; 668 669 base = (struct bts_record *)(unsigned long)ds->bts_buffer_base; 670 top = (struct bts_record *)(unsigned long)ds->bts_index; 671 672 if (top <= base) 673 return 0; 674 675 memset(®s, 0, sizeof(regs)); 676 677 ds->bts_index = ds->bts_buffer_base; 678 679 perf_sample_data_init(&data, 0, event->hw.last_period); 680 681 /* 682 * BTS leaks kernel addresses in branches across the cpl boundary, 683 * such as traps or system calls, so unless the user is asking for 684 * kernel tracing (and right now it's not possible), we'd need to 685 * filter them out. But first we need to count how many of those we 686 * have in the current batch. This is an extra O(n) pass, however, 687 * it's much faster than the other one especially considering that 688 * n <= 2560 (BTS_BUFFER_SIZE / BTS_RECORD_SIZE * 15/16; see the 689 * alloc_bts_buffer()). 690 */ 691 for (at = base; at < top; at++) { 692 /* 693 * Note that right now *this* BTS code only works if 694 * attr::exclude_kernel is set, but let's keep this extra 695 * check here in case that changes. 696 */ 697 if (event->attr.exclude_kernel && 698 (kernel_ip(at->from) || kernel_ip(at->to))) 699 skip++; 700 } 701 702 /* 703 * Prepare a generic sample, i.e. fill in the invariant fields. 704 * We will overwrite the from and to address before we output 705 * the sample. 706 */ 707 rcu_read_lock(); 708 perf_prepare_sample(&header, &data, event, ®s); 709 710 if (perf_output_begin(&handle, &data, event, 711 header.size * (top - base - skip))) 712 goto unlock; 713 714 for (at = base; at < top; at++) { 715 /* Filter out any records that contain kernel addresses. */ 716 if (event->attr.exclude_kernel && 717 (kernel_ip(at->from) || kernel_ip(at->to))) 718 continue; 719 720 data.ip = at->from; 721 data.addr = at->to; 722 723 perf_output_sample(&handle, &header, &data, event); 724 } 725 726 perf_output_end(&handle); 727 728 /* There's new data available. */ 729 event->hw.interrupts++; 730 event->pending_kill = POLL_IN; 731 unlock: 732 rcu_read_unlock(); 733 return 1; 734 } 735 736 static inline void intel_pmu_drain_pebs_buffer(void) 737 { 738 struct perf_sample_data data; 739 740 x86_pmu.drain_pebs(NULL, &data); 741 } 742 743 /* 744 * PEBS 745 */ 746 struct event_constraint intel_core2_pebs_event_constraints[] = { 747 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */ 748 INTEL_FLAGS_UEVENT_CONSTRAINT(0xfec1, 0x1), /* X87_OPS_RETIRED.ANY */ 749 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* BR_INST_RETIRED.MISPRED */ 750 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1fc7, 0x1), /* SIMD_INST_RETURED.ANY */ 751 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */ 752 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 753 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x01), 754 EVENT_CONSTRAINT_END 755 }; 756 757 struct event_constraint intel_atom_pebs_event_constraints[] = { 758 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */ 759 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* MISPREDICTED_BRANCH_RETIRED */ 760 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */ 761 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 762 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x01), 763 /* Allow all events as PEBS with no flags */ 764 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), 765 EVENT_CONSTRAINT_END 766 }; 767 768 struct event_constraint intel_slm_pebs_event_constraints[] = { 769 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 770 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x1), 771 /* Allow all events as PEBS with no flags */ 772 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), 773 EVENT_CONSTRAINT_END 774 }; 775 776 struct event_constraint intel_glm_pebs_event_constraints[] = { 777 /* Allow all events as PEBS with no flags */ 778 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), 779 EVENT_CONSTRAINT_END 780 }; 781 782 struct event_constraint intel_nehalem_pebs_event_constraints[] = { 783 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ 784 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ 785 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ 786 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INST_RETIRED.ANY */ 787 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ 788 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ 789 INTEL_FLAGS_UEVENT_CONSTRAINT(0x02c5, 0xf), /* BR_MISP_RETIRED.NEAR_CALL */ 790 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ 791 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ 792 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ 793 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ 794 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 795 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x0f), 796 EVENT_CONSTRAINT_END 797 }; 798 799 struct event_constraint intel_westmere_pebs_event_constraints[] = { 800 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ 801 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ 802 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ 803 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INSTR_RETIRED.* */ 804 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ 805 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ 806 INTEL_FLAGS_EVENT_CONSTRAINT(0xc5, 0xf), /* BR_MISP_RETIRED.* */ 807 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ 808 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ 809 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ 810 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ 811 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 812 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x0f), 813 EVENT_CONSTRAINT_END 814 }; 815 816 struct event_constraint intel_snb_pebs_event_constraints[] = { 817 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 818 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ 819 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ 820 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 821 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 822 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ 823 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 824 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ 825 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ 826 /* Allow all events as PEBS with no flags */ 827 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 828 EVENT_CONSTRAINT_END 829 }; 830 831 struct event_constraint intel_ivb_pebs_event_constraints[] = { 832 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 833 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ 834 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ 835 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 836 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 837 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 838 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 839 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ 840 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 841 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ 842 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ 843 /* Allow all events as PEBS with no flags */ 844 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 845 EVENT_CONSTRAINT_END 846 }; 847 848 struct event_constraint intel_hsw_pebs_event_constraints[] = { 849 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 850 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ 851 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 852 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 853 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 854 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 855 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ 856 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ 857 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ 858 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ 859 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ 860 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ 861 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ 862 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ 863 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 864 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ 865 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ 866 /* Allow all events as PEBS with no flags */ 867 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 868 EVENT_CONSTRAINT_END 869 }; 870 871 struct event_constraint intel_bdw_pebs_event_constraints[] = { 872 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 873 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ 874 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 875 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 876 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 877 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 878 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ 879 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ 880 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ 881 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ 882 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ 883 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ 884 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ 885 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ 886 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 887 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ 888 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ 889 /* Allow all events as PEBS with no flags */ 890 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 891 EVENT_CONSTRAINT_END 892 }; 893 894 895 struct event_constraint intel_skl_pebs_event_constraints[] = { 896 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2), /* INST_RETIRED.PREC_DIST */ 897 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 898 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 899 /* INST_RETIRED.TOTAL_CYCLES_PS (inv=1, cmask=16) (cycles:p). */ 900 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x0f), 901 INTEL_PLD_CONSTRAINT(0x1cd, 0xf), /* MEM_TRANS_RETIRED.* */ 902 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */ 903 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */ 904 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_INST_RETIRED.LOCK_LOADS */ 905 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x22d0, 0xf), /* MEM_INST_RETIRED.LOCK_STORES */ 906 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_INST_RETIRED.SPLIT_LOADS */ 907 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_INST_RETIRED.SPLIT_STORES */ 908 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_INST_RETIRED.ALL_LOADS */ 909 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_INST_RETIRED.ALL_STORES */ 910 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_RETIRED.* */ 911 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_L3_HIT_RETIRED.* */ 912 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_L3_MISS_RETIRED.* */ 913 /* Allow all events as PEBS with no flags */ 914 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 915 EVENT_CONSTRAINT_END 916 }; 917 918 struct event_constraint intel_icl_pebs_event_constraints[] = { 919 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL), /* INST_RETIRED.PREC_DIST */ 920 INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL), /* SLOTS */ 921 922 INTEL_PLD_CONSTRAINT(0x1cd, 0xff), /* MEM_TRANS_RETIRED.LOAD_LATENCY */ 923 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x1d0, 0xf), /* MEM_INST_RETIRED.LOAD */ 924 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x2d0, 0xf), /* MEM_INST_RETIRED.STORE */ 925 926 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD_RANGE(0xd1, 0xd4, 0xf), /* MEM_LOAD_*_RETIRED.* */ 927 928 INTEL_FLAGS_EVENT_CONSTRAINT(0xd0, 0xf), /* MEM_INST_RETIRED.* */ 929 930 /* 931 * Everything else is handled by PMU_FL_PEBS_ALL, because we 932 * need the full constraints from the main table. 933 */ 934 935 EVENT_CONSTRAINT_END 936 }; 937 938 struct event_constraint intel_spr_pebs_event_constraints[] = { 939 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL), 940 INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL), 941 942 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xfe), 943 INTEL_PLD_CONSTRAINT(0x1cd, 0xfe), 944 INTEL_PSD_CONSTRAINT(0x2cd, 0x1), 945 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x1d0, 0xf), 946 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x2d0, 0xf), 947 948 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD_RANGE(0xd1, 0xd4, 0xf), 949 950 INTEL_FLAGS_EVENT_CONSTRAINT(0xd0, 0xf), 951 952 /* 953 * Everything else is handled by PMU_FL_PEBS_ALL, because we 954 * need the full constraints from the main table. 955 */ 956 957 EVENT_CONSTRAINT_END 958 }; 959 960 struct event_constraint *intel_pebs_constraints(struct perf_event *event) 961 { 962 struct event_constraint *c; 963 964 if (!event->attr.precise_ip) 965 return NULL; 966 967 if (x86_pmu.pebs_constraints) { 968 for_each_event_constraint(c, x86_pmu.pebs_constraints) { 969 if (constraint_match(c, event->hw.config)) { 970 event->hw.flags |= c->flags; 971 return c; 972 } 973 } 974 } 975 976 /* 977 * Extended PEBS support 978 * Makes the PEBS code search the normal constraints. 979 */ 980 if (x86_pmu.flags & PMU_FL_PEBS_ALL) 981 return NULL; 982 983 return &emptyconstraint; 984 } 985 986 /* 987 * We need the sched_task callback even for per-cpu events when we use 988 * the large interrupt threshold, such that we can provide PID and TID 989 * to PEBS samples. 990 */ 991 static inline bool pebs_needs_sched_cb(struct cpu_hw_events *cpuc) 992 { 993 if (cpuc->n_pebs == cpuc->n_pebs_via_pt) 994 return false; 995 996 return cpuc->n_pebs && (cpuc->n_pebs == cpuc->n_large_pebs); 997 } 998 999 void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in) 1000 { 1001 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1002 1003 if (!sched_in && pebs_needs_sched_cb(cpuc)) 1004 intel_pmu_drain_pebs_buffer(); 1005 } 1006 1007 static inline void pebs_update_threshold(struct cpu_hw_events *cpuc) 1008 { 1009 struct debug_store *ds = cpuc->ds; 1010 u64 threshold; 1011 int reserved; 1012 1013 if (cpuc->n_pebs_via_pt) 1014 return; 1015 1016 if (x86_pmu.flags & PMU_FL_PEBS_ALL) 1017 reserved = x86_pmu.max_pebs_events + x86_pmu.num_counters_fixed; 1018 else 1019 reserved = x86_pmu.max_pebs_events; 1020 1021 if (cpuc->n_pebs == cpuc->n_large_pebs) { 1022 threshold = ds->pebs_absolute_maximum - 1023 reserved * cpuc->pebs_record_size; 1024 } else { 1025 threshold = ds->pebs_buffer_base + cpuc->pebs_record_size; 1026 } 1027 1028 ds->pebs_interrupt_threshold = threshold; 1029 } 1030 1031 static void adaptive_pebs_record_size_update(void) 1032 { 1033 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1034 u64 pebs_data_cfg = cpuc->pebs_data_cfg; 1035 int sz = sizeof(struct pebs_basic); 1036 1037 if (pebs_data_cfg & PEBS_DATACFG_MEMINFO) 1038 sz += sizeof(struct pebs_meminfo); 1039 if (pebs_data_cfg & PEBS_DATACFG_GP) 1040 sz += sizeof(struct pebs_gprs); 1041 if (pebs_data_cfg & PEBS_DATACFG_XMMS) 1042 sz += sizeof(struct pebs_xmm); 1043 if (pebs_data_cfg & PEBS_DATACFG_LBRS) 1044 sz += x86_pmu.lbr_nr * sizeof(struct lbr_entry); 1045 1046 cpuc->pebs_record_size = sz; 1047 } 1048 1049 #define PERF_PEBS_MEMINFO_TYPE (PERF_SAMPLE_ADDR | PERF_SAMPLE_DATA_SRC | \ 1050 PERF_SAMPLE_PHYS_ADDR | \ 1051 PERF_SAMPLE_WEIGHT_TYPE | \ 1052 PERF_SAMPLE_TRANSACTION | \ 1053 PERF_SAMPLE_DATA_PAGE_SIZE) 1054 1055 static u64 pebs_update_adaptive_cfg(struct perf_event *event) 1056 { 1057 struct perf_event_attr *attr = &event->attr; 1058 u64 sample_type = attr->sample_type; 1059 u64 pebs_data_cfg = 0; 1060 bool gprs, tsx_weight; 1061 1062 if (!(sample_type & ~(PERF_SAMPLE_IP|PERF_SAMPLE_TIME)) && 1063 attr->precise_ip > 1) 1064 return pebs_data_cfg; 1065 1066 if (sample_type & PERF_PEBS_MEMINFO_TYPE) 1067 pebs_data_cfg |= PEBS_DATACFG_MEMINFO; 1068 1069 /* 1070 * We need GPRs when: 1071 * + user requested them 1072 * + precise_ip < 2 for the non event IP 1073 * + For RTM TSX weight we need GPRs for the abort code. 1074 */ 1075 gprs = (sample_type & PERF_SAMPLE_REGS_INTR) && 1076 (attr->sample_regs_intr & PEBS_GP_REGS); 1077 1078 tsx_weight = (sample_type & PERF_SAMPLE_WEIGHT_TYPE) && 1079 ((attr->config & INTEL_ARCH_EVENT_MASK) == 1080 x86_pmu.rtm_abort_event); 1081 1082 if (gprs || (attr->precise_ip < 2) || tsx_weight) 1083 pebs_data_cfg |= PEBS_DATACFG_GP; 1084 1085 if ((sample_type & PERF_SAMPLE_REGS_INTR) && 1086 (attr->sample_regs_intr & PERF_REG_EXTENDED_MASK)) 1087 pebs_data_cfg |= PEBS_DATACFG_XMMS; 1088 1089 if (sample_type & PERF_SAMPLE_BRANCH_STACK) { 1090 /* 1091 * For now always log all LBRs. Could configure this 1092 * later. 1093 */ 1094 pebs_data_cfg |= PEBS_DATACFG_LBRS | 1095 ((x86_pmu.lbr_nr-1) << PEBS_DATACFG_LBR_SHIFT); 1096 } 1097 1098 return pebs_data_cfg; 1099 } 1100 1101 static void 1102 pebs_update_state(bool needed_cb, struct cpu_hw_events *cpuc, 1103 struct perf_event *event, bool add) 1104 { 1105 struct pmu *pmu = event->ctx->pmu; 1106 /* 1107 * Make sure we get updated with the first PEBS 1108 * event. It will trigger also during removal, but 1109 * that does not hurt: 1110 */ 1111 bool update = cpuc->n_pebs == 1; 1112 1113 if (needed_cb != pebs_needs_sched_cb(cpuc)) { 1114 if (!needed_cb) 1115 perf_sched_cb_inc(pmu); 1116 else 1117 perf_sched_cb_dec(pmu); 1118 1119 update = true; 1120 } 1121 1122 /* 1123 * The PEBS record doesn't shrink on pmu::del(). Doing so would require 1124 * iterating all remaining PEBS events to reconstruct the config. 1125 */ 1126 if (x86_pmu.intel_cap.pebs_baseline && add) { 1127 u64 pebs_data_cfg; 1128 1129 /* Clear pebs_data_cfg and pebs_record_size for first PEBS. */ 1130 if (cpuc->n_pebs == 1) { 1131 cpuc->pebs_data_cfg = 0; 1132 cpuc->pebs_record_size = sizeof(struct pebs_basic); 1133 } 1134 1135 pebs_data_cfg = pebs_update_adaptive_cfg(event); 1136 1137 /* Update pebs_record_size if new event requires more data. */ 1138 if (pebs_data_cfg & ~cpuc->pebs_data_cfg) { 1139 cpuc->pebs_data_cfg |= pebs_data_cfg; 1140 adaptive_pebs_record_size_update(); 1141 update = true; 1142 } 1143 } 1144 1145 if (update) 1146 pebs_update_threshold(cpuc); 1147 } 1148 1149 void intel_pmu_pebs_add(struct perf_event *event) 1150 { 1151 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1152 struct hw_perf_event *hwc = &event->hw; 1153 bool needed_cb = pebs_needs_sched_cb(cpuc); 1154 1155 cpuc->n_pebs++; 1156 if (hwc->flags & PERF_X86_EVENT_LARGE_PEBS) 1157 cpuc->n_large_pebs++; 1158 if (hwc->flags & PERF_X86_EVENT_PEBS_VIA_PT) 1159 cpuc->n_pebs_via_pt++; 1160 1161 pebs_update_state(needed_cb, cpuc, event, true); 1162 } 1163 1164 static void intel_pmu_pebs_via_pt_disable(struct perf_event *event) 1165 { 1166 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1167 1168 if (!is_pebs_pt(event)) 1169 return; 1170 1171 if (!(cpuc->pebs_enabled & ~PEBS_VIA_PT_MASK)) 1172 cpuc->pebs_enabled &= ~PEBS_VIA_PT_MASK; 1173 } 1174 1175 static void intel_pmu_pebs_via_pt_enable(struct perf_event *event) 1176 { 1177 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1178 struct hw_perf_event *hwc = &event->hw; 1179 struct debug_store *ds = cpuc->ds; 1180 1181 if (!is_pebs_pt(event)) 1182 return; 1183 1184 if (!(event->hw.flags & PERF_X86_EVENT_LARGE_PEBS)) 1185 cpuc->pebs_enabled |= PEBS_PMI_AFTER_EACH_RECORD; 1186 1187 cpuc->pebs_enabled |= PEBS_OUTPUT_PT; 1188 1189 wrmsrl(MSR_RELOAD_PMC0 + hwc->idx, ds->pebs_event_reset[hwc->idx]); 1190 } 1191 1192 void intel_pmu_pebs_enable(struct perf_event *event) 1193 { 1194 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1195 struct hw_perf_event *hwc = &event->hw; 1196 struct debug_store *ds = cpuc->ds; 1197 1198 hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT; 1199 1200 cpuc->pebs_enabled |= 1ULL << hwc->idx; 1201 1202 if ((event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) && (x86_pmu.version < 5)) 1203 cpuc->pebs_enabled |= 1ULL << (hwc->idx + 32); 1204 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) 1205 cpuc->pebs_enabled |= 1ULL << 63; 1206 1207 if (x86_pmu.intel_cap.pebs_baseline) { 1208 hwc->config |= ICL_EVENTSEL_ADAPTIVE; 1209 if (cpuc->pebs_data_cfg != cpuc->active_pebs_data_cfg) { 1210 wrmsrl(MSR_PEBS_DATA_CFG, cpuc->pebs_data_cfg); 1211 cpuc->active_pebs_data_cfg = cpuc->pebs_data_cfg; 1212 } 1213 } 1214 1215 /* 1216 * Use auto-reload if possible to save a MSR write in the PMI. 1217 * This must be done in pmu::start(), because PERF_EVENT_IOC_PERIOD. 1218 */ 1219 if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) { 1220 unsigned int idx = hwc->idx; 1221 1222 if (idx >= INTEL_PMC_IDX_FIXED) 1223 idx = MAX_PEBS_EVENTS + (idx - INTEL_PMC_IDX_FIXED); 1224 ds->pebs_event_reset[idx] = 1225 (u64)(-hwc->sample_period) & x86_pmu.cntval_mask; 1226 } else { 1227 ds->pebs_event_reset[hwc->idx] = 0; 1228 } 1229 1230 intel_pmu_pebs_via_pt_enable(event); 1231 } 1232 1233 void intel_pmu_pebs_del(struct perf_event *event) 1234 { 1235 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1236 struct hw_perf_event *hwc = &event->hw; 1237 bool needed_cb = pebs_needs_sched_cb(cpuc); 1238 1239 cpuc->n_pebs--; 1240 if (hwc->flags & PERF_X86_EVENT_LARGE_PEBS) 1241 cpuc->n_large_pebs--; 1242 if (hwc->flags & PERF_X86_EVENT_PEBS_VIA_PT) 1243 cpuc->n_pebs_via_pt--; 1244 1245 pebs_update_state(needed_cb, cpuc, event, false); 1246 } 1247 1248 void intel_pmu_pebs_disable(struct perf_event *event) 1249 { 1250 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1251 struct hw_perf_event *hwc = &event->hw; 1252 1253 if (cpuc->n_pebs == cpuc->n_large_pebs && 1254 cpuc->n_pebs != cpuc->n_pebs_via_pt) 1255 intel_pmu_drain_pebs_buffer(); 1256 1257 cpuc->pebs_enabled &= ~(1ULL << hwc->idx); 1258 1259 if ((event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) && 1260 (x86_pmu.version < 5)) 1261 cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32)); 1262 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) 1263 cpuc->pebs_enabled &= ~(1ULL << 63); 1264 1265 intel_pmu_pebs_via_pt_disable(event); 1266 1267 if (cpuc->enabled) 1268 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); 1269 1270 hwc->config |= ARCH_PERFMON_EVENTSEL_INT; 1271 } 1272 1273 void intel_pmu_pebs_enable_all(void) 1274 { 1275 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1276 1277 if (cpuc->pebs_enabled) 1278 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); 1279 } 1280 1281 void intel_pmu_pebs_disable_all(void) 1282 { 1283 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1284 1285 if (cpuc->pebs_enabled) 1286 wrmsrl(MSR_IA32_PEBS_ENABLE, 0); 1287 } 1288 1289 static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs) 1290 { 1291 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1292 unsigned long from = cpuc->lbr_entries[0].from; 1293 unsigned long old_to, to = cpuc->lbr_entries[0].to; 1294 unsigned long ip = regs->ip; 1295 int is_64bit = 0; 1296 void *kaddr; 1297 int size; 1298 1299 /* 1300 * We don't need to fixup if the PEBS assist is fault like 1301 */ 1302 if (!x86_pmu.intel_cap.pebs_trap) 1303 return 1; 1304 1305 /* 1306 * No LBR entry, no basic block, no rewinding 1307 */ 1308 if (!cpuc->lbr_stack.nr || !from || !to) 1309 return 0; 1310 1311 /* 1312 * Basic blocks should never cross user/kernel boundaries 1313 */ 1314 if (kernel_ip(ip) != kernel_ip(to)) 1315 return 0; 1316 1317 /* 1318 * unsigned math, either ip is before the start (impossible) or 1319 * the basic block is larger than 1 page (sanity) 1320 */ 1321 if ((ip - to) > PEBS_FIXUP_SIZE) 1322 return 0; 1323 1324 /* 1325 * We sampled a branch insn, rewind using the LBR stack 1326 */ 1327 if (ip == to) { 1328 set_linear_ip(regs, from); 1329 return 1; 1330 } 1331 1332 size = ip - to; 1333 if (!kernel_ip(ip)) { 1334 int bytes; 1335 u8 *buf = this_cpu_read(insn_buffer); 1336 1337 /* 'size' must fit our buffer, see above */ 1338 bytes = copy_from_user_nmi(buf, (void __user *)to, size); 1339 if (bytes != 0) 1340 return 0; 1341 1342 kaddr = buf; 1343 } else { 1344 kaddr = (void *)to; 1345 } 1346 1347 do { 1348 struct insn insn; 1349 1350 old_to = to; 1351 1352 #ifdef CONFIG_X86_64 1353 is_64bit = kernel_ip(to) || any_64bit_mode(regs); 1354 #endif 1355 insn_init(&insn, kaddr, size, is_64bit); 1356 insn_get_length(&insn); 1357 /* 1358 * Make sure there was not a problem decoding the 1359 * instruction and getting the length. This is 1360 * doubly important because we have an infinite 1361 * loop if insn.length=0. 1362 */ 1363 if (!insn.length) 1364 break; 1365 1366 to += insn.length; 1367 kaddr += insn.length; 1368 size -= insn.length; 1369 } while (to < ip); 1370 1371 if (to == ip) { 1372 set_linear_ip(regs, old_to); 1373 return 1; 1374 } 1375 1376 /* 1377 * Even though we decoded the basic block, the instruction stream 1378 * never matched the given IP, either the TO or the IP got corrupted. 1379 */ 1380 return 0; 1381 } 1382 1383 static inline u64 intel_get_tsx_weight(u64 tsx_tuning) 1384 { 1385 if (tsx_tuning) { 1386 union hsw_tsx_tuning tsx = { .value = tsx_tuning }; 1387 return tsx.cycles_last_block; 1388 } 1389 return 0; 1390 } 1391 1392 static inline u64 intel_get_tsx_transaction(u64 tsx_tuning, u64 ax) 1393 { 1394 u64 txn = (tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32; 1395 1396 /* For RTM XABORTs also log the abort code from AX */ 1397 if ((txn & PERF_TXN_TRANSACTION) && (ax & 1)) 1398 txn |= ((ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT; 1399 return txn; 1400 } 1401 1402 static inline u64 get_pebs_status(void *n) 1403 { 1404 if (x86_pmu.intel_cap.pebs_format < 4) 1405 return ((struct pebs_record_nhm *)n)->status; 1406 return ((struct pebs_basic *)n)->applicable_counters; 1407 } 1408 1409 #define PERF_X86_EVENT_PEBS_HSW_PREC \ 1410 (PERF_X86_EVENT_PEBS_ST_HSW | \ 1411 PERF_X86_EVENT_PEBS_LD_HSW | \ 1412 PERF_X86_EVENT_PEBS_NA_HSW) 1413 1414 static u64 get_data_src(struct perf_event *event, u64 aux) 1415 { 1416 u64 val = PERF_MEM_NA; 1417 int fl = event->hw.flags; 1418 bool fst = fl & (PERF_X86_EVENT_PEBS_ST | PERF_X86_EVENT_PEBS_HSW_PREC); 1419 1420 if (fl & PERF_X86_EVENT_PEBS_LDLAT) 1421 val = load_latency_data(aux); 1422 else if (fl & PERF_X86_EVENT_PEBS_STLAT) 1423 val = store_latency_data(aux); 1424 else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC)) 1425 val = precise_datala_hsw(event, aux); 1426 else if (fst) 1427 val = precise_store_data(aux); 1428 return val; 1429 } 1430 1431 #define PERF_SAMPLE_ADDR_TYPE (PERF_SAMPLE_ADDR | \ 1432 PERF_SAMPLE_PHYS_ADDR | \ 1433 PERF_SAMPLE_DATA_PAGE_SIZE) 1434 1435 static void setup_pebs_fixed_sample_data(struct perf_event *event, 1436 struct pt_regs *iregs, void *__pebs, 1437 struct perf_sample_data *data, 1438 struct pt_regs *regs) 1439 { 1440 /* 1441 * We cast to the biggest pebs_record but are careful not to 1442 * unconditionally access the 'extra' entries. 1443 */ 1444 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1445 struct pebs_record_skl *pebs = __pebs; 1446 u64 sample_type; 1447 int fll; 1448 1449 if (pebs == NULL) 1450 return; 1451 1452 sample_type = event->attr.sample_type; 1453 fll = event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT; 1454 1455 perf_sample_data_init(data, 0, event->hw.last_period); 1456 1457 data->period = event->hw.last_period; 1458 1459 /* 1460 * Use latency for weight (only avail with PEBS-LL) 1461 */ 1462 if (fll && (sample_type & PERF_SAMPLE_WEIGHT_TYPE)) 1463 data->weight.full = pebs->lat; 1464 1465 /* 1466 * data.data_src encodes the data source 1467 */ 1468 if (sample_type & PERF_SAMPLE_DATA_SRC) 1469 data->data_src.val = get_data_src(event, pebs->dse); 1470 1471 /* 1472 * We must however always use iregs for the unwinder to stay sane; the 1473 * record BP,SP,IP can point into thin air when the record is from a 1474 * previous PMI context or an (I)RET happened between the record and 1475 * PMI. 1476 */ 1477 if (sample_type & PERF_SAMPLE_CALLCHAIN) 1478 data->callchain = perf_callchain(event, iregs); 1479 1480 /* 1481 * We use the interrupt regs as a base because the PEBS record does not 1482 * contain a full regs set, specifically it seems to lack segment 1483 * descriptors, which get used by things like user_mode(). 1484 * 1485 * In the simple case fix up only the IP for PERF_SAMPLE_IP. 1486 */ 1487 *regs = *iregs; 1488 1489 /* 1490 * Initialize regs_>flags from PEBS, 1491 * Clear exact bit (which uses x86 EFLAGS Reserved bit 3), 1492 * i.e., do not rely on it being zero: 1493 */ 1494 regs->flags = pebs->flags & ~PERF_EFLAGS_EXACT; 1495 1496 if (sample_type & PERF_SAMPLE_REGS_INTR) { 1497 regs->ax = pebs->ax; 1498 regs->bx = pebs->bx; 1499 regs->cx = pebs->cx; 1500 regs->dx = pebs->dx; 1501 regs->si = pebs->si; 1502 regs->di = pebs->di; 1503 1504 regs->bp = pebs->bp; 1505 regs->sp = pebs->sp; 1506 1507 #ifndef CONFIG_X86_32 1508 regs->r8 = pebs->r8; 1509 regs->r9 = pebs->r9; 1510 regs->r10 = pebs->r10; 1511 regs->r11 = pebs->r11; 1512 regs->r12 = pebs->r12; 1513 regs->r13 = pebs->r13; 1514 regs->r14 = pebs->r14; 1515 regs->r15 = pebs->r15; 1516 #endif 1517 } 1518 1519 if (event->attr.precise_ip > 1) { 1520 /* 1521 * Haswell and later processors have an 'eventing IP' 1522 * (real IP) which fixes the off-by-1 skid in hardware. 1523 * Use it when precise_ip >= 2 : 1524 */ 1525 if (x86_pmu.intel_cap.pebs_format >= 2) { 1526 set_linear_ip(regs, pebs->real_ip); 1527 regs->flags |= PERF_EFLAGS_EXACT; 1528 } else { 1529 /* Otherwise, use PEBS off-by-1 IP: */ 1530 set_linear_ip(regs, pebs->ip); 1531 1532 /* 1533 * With precise_ip >= 2, try to fix up the off-by-1 IP 1534 * using the LBR. If successful, the fixup function 1535 * corrects regs->ip and calls set_linear_ip() on regs: 1536 */ 1537 if (intel_pmu_pebs_fixup_ip(regs)) 1538 regs->flags |= PERF_EFLAGS_EXACT; 1539 } 1540 } else { 1541 /* 1542 * When precise_ip == 1, return the PEBS off-by-1 IP, 1543 * no fixup attempted: 1544 */ 1545 set_linear_ip(regs, pebs->ip); 1546 } 1547 1548 1549 if ((sample_type & PERF_SAMPLE_ADDR_TYPE) && 1550 x86_pmu.intel_cap.pebs_format >= 1) 1551 data->addr = pebs->dla; 1552 1553 if (x86_pmu.intel_cap.pebs_format >= 2) { 1554 /* Only set the TSX weight when no memory weight. */ 1555 if ((sample_type & PERF_SAMPLE_WEIGHT_TYPE) && !fll) 1556 data->weight.full = intel_get_tsx_weight(pebs->tsx_tuning); 1557 1558 if (sample_type & PERF_SAMPLE_TRANSACTION) 1559 data->txn = intel_get_tsx_transaction(pebs->tsx_tuning, 1560 pebs->ax); 1561 } 1562 1563 /* 1564 * v3 supplies an accurate time stamp, so we use that 1565 * for the time stamp. 1566 * 1567 * We can only do this for the default trace clock. 1568 */ 1569 if (x86_pmu.intel_cap.pebs_format >= 3 && 1570 event->attr.use_clockid == 0) 1571 data->time = native_sched_clock_from_tsc(pebs->tsc); 1572 1573 if (has_branch_stack(event)) 1574 data->br_stack = &cpuc->lbr_stack; 1575 } 1576 1577 static void adaptive_pebs_save_regs(struct pt_regs *regs, 1578 struct pebs_gprs *gprs) 1579 { 1580 regs->ax = gprs->ax; 1581 regs->bx = gprs->bx; 1582 regs->cx = gprs->cx; 1583 regs->dx = gprs->dx; 1584 regs->si = gprs->si; 1585 regs->di = gprs->di; 1586 regs->bp = gprs->bp; 1587 regs->sp = gprs->sp; 1588 #ifndef CONFIG_X86_32 1589 regs->r8 = gprs->r8; 1590 regs->r9 = gprs->r9; 1591 regs->r10 = gprs->r10; 1592 regs->r11 = gprs->r11; 1593 regs->r12 = gprs->r12; 1594 regs->r13 = gprs->r13; 1595 regs->r14 = gprs->r14; 1596 regs->r15 = gprs->r15; 1597 #endif 1598 } 1599 1600 #define PEBS_LATENCY_MASK 0xffff 1601 #define PEBS_CACHE_LATENCY_OFFSET 32 1602 1603 /* 1604 * With adaptive PEBS the layout depends on what fields are configured. 1605 */ 1606 1607 static void setup_pebs_adaptive_sample_data(struct perf_event *event, 1608 struct pt_regs *iregs, void *__pebs, 1609 struct perf_sample_data *data, 1610 struct pt_regs *regs) 1611 { 1612 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1613 struct pebs_basic *basic = __pebs; 1614 void *next_record = basic + 1; 1615 u64 sample_type; 1616 u64 format_size; 1617 struct pebs_meminfo *meminfo = NULL; 1618 struct pebs_gprs *gprs = NULL; 1619 struct x86_perf_regs *perf_regs; 1620 1621 if (basic == NULL) 1622 return; 1623 1624 perf_regs = container_of(regs, struct x86_perf_regs, regs); 1625 perf_regs->xmm_regs = NULL; 1626 1627 sample_type = event->attr.sample_type; 1628 format_size = basic->format_size; 1629 perf_sample_data_init(data, 0, event->hw.last_period); 1630 data->period = event->hw.last_period; 1631 1632 if (event->attr.use_clockid == 0) 1633 data->time = native_sched_clock_from_tsc(basic->tsc); 1634 1635 /* 1636 * We must however always use iregs for the unwinder to stay sane; the 1637 * record BP,SP,IP can point into thin air when the record is from a 1638 * previous PMI context or an (I)RET happened between the record and 1639 * PMI. 1640 */ 1641 if (sample_type & PERF_SAMPLE_CALLCHAIN) 1642 data->callchain = perf_callchain(event, iregs); 1643 1644 *regs = *iregs; 1645 /* The ip in basic is EventingIP */ 1646 set_linear_ip(regs, basic->ip); 1647 regs->flags = PERF_EFLAGS_EXACT; 1648 1649 /* 1650 * The record for MEMINFO is in front of GP 1651 * But PERF_SAMPLE_TRANSACTION needs gprs->ax. 1652 * Save the pointer here but process later. 1653 */ 1654 if (format_size & PEBS_DATACFG_MEMINFO) { 1655 meminfo = next_record; 1656 next_record = meminfo + 1; 1657 } 1658 1659 if (format_size & PEBS_DATACFG_GP) { 1660 gprs = next_record; 1661 next_record = gprs + 1; 1662 1663 if (event->attr.precise_ip < 2) { 1664 set_linear_ip(regs, gprs->ip); 1665 regs->flags &= ~PERF_EFLAGS_EXACT; 1666 } 1667 1668 if (sample_type & PERF_SAMPLE_REGS_INTR) 1669 adaptive_pebs_save_regs(regs, gprs); 1670 } 1671 1672 if (format_size & PEBS_DATACFG_MEMINFO) { 1673 if (sample_type & PERF_SAMPLE_WEIGHT_TYPE) { 1674 u64 weight = meminfo->latency; 1675 1676 if (x86_pmu.flags & PMU_FL_INSTR_LATENCY) { 1677 data->weight.var2_w = weight & PEBS_LATENCY_MASK; 1678 weight >>= PEBS_CACHE_LATENCY_OFFSET; 1679 } 1680 1681 /* 1682 * Although meminfo::latency is defined as a u64, 1683 * only the lower 32 bits include the valid data 1684 * in practice on Ice Lake and earlier platforms. 1685 */ 1686 if (sample_type & PERF_SAMPLE_WEIGHT) { 1687 data->weight.full = weight ?: 1688 intel_get_tsx_weight(meminfo->tsx_tuning); 1689 } else { 1690 data->weight.var1_dw = (u32)(weight & PEBS_LATENCY_MASK) ?: 1691 intel_get_tsx_weight(meminfo->tsx_tuning); 1692 } 1693 } 1694 1695 if (sample_type & PERF_SAMPLE_DATA_SRC) 1696 data->data_src.val = get_data_src(event, meminfo->aux); 1697 1698 if (sample_type & PERF_SAMPLE_ADDR_TYPE) 1699 data->addr = meminfo->address; 1700 1701 if (sample_type & PERF_SAMPLE_TRANSACTION) 1702 data->txn = intel_get_tsx_transaction(meminfo->tsx_tuning, 1703 gprs ? gprs->ax : 0); 1704 } 1705 1706 if (format_size & PEBS_DATACFG_XMMS) { 1707 struct pebs_xmm *xmm = next_record; 1708 1709 next_record = xmm + 1; 1710 perf_regs->xmm_regs = xmm->xmm; 1711 } 1712 1713 if (format_size & PEBS_DATACFG_LBRS) { 1714 struct lbr_entry *lbr = next_record; 1715 int num_lbr = ((format_size >> PEBS_DATACFG_LBR_SHIFT) 1716 & 0xff) + 1; 1717 next_record = next_record + num_lbr * sizeof(struct lbr_entry); 1718 1719 if (has_branch_stack(event)) { 1720 intel_pmu_store_pebs_lbrs(lbr); 1721 data->br_stack = &cpuc->lbr_stack; 1722 } 1723 } 1724 1725 WARN_ONCE(next_record != __pebs + (format_size >> 48), 1726 "PEBS record size %llu, expected %llu, config %llx\n", 1727 format_size >> 48, 1728 (u64)(next_record - __pebs), 1729 basic->format_size); 1730 } 1731 1732 static inline void * 1733 get_next_pebs_record_by_bit(void *base, void *top, int bit) 1734 { 1735 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1736 void *at; 1737 u64 pebs_status; 1738 1739 /* 1740 * fmt0 does not have a status bitfield (does not use 1741 * perf_record_nhm format) 1742 */ 1743 if (x86_pmu.intel_cap.pebs_format < 1) 1744 return base; 1745 1746 if (base == NULL) 1747 return NULL; 1748 1749 for (at = base; at < top; at += cpuc->pebs_record_size) { 1750 unsigned long status = get_pebs_status(at); 1751 1752 if (test_bit(bit, (unsigned long *)&status)) { 1753 /* PEBS v3 has accurate status bits */ 1754 if (x86_pmu.intel_cap.pebs_format >= 3) 1755 return at; 1756 1757 if (status == (1 << bit)) 1758 return at; 1759 1760 /* clear non-PEBS bit and re-check */ 1761 pebs_status = status & cpuc->pebs_enabled; 1762 pebs_status &= PEBS_COUNTER_MASK; 1763 if (pebs_status == (1 << bit)) 1764 return at; 1765 } 1766 } 1767 return NULL; 1768 } 1769 1770 void intel_pmu_auto_reload_read(struct perf_event *event) 1771 { 1772 WARN_ON(!(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)); 1773 1774 perf_pmu_disable(event->pmu); 1775 intel_pmu_drain_pebs_buffer(); 1776 perf_pmu_enable(event->pmu); 1777 } 1778 1779 /* 1780 * Special variant of intel_pmu_save_and_restart() for auto-reload. 1781 */ 1782 static int 1783 intel_pmu_save_and_restart_reload(struct perf_event *event, int count) 1784 { 1785 struct hw_perf_event *hwc = &event->hw; 1786 int shift = 64 - x86_pmu.cntval_bits; 1787 u64 period = hwc->sample_period; 1788 u64 prev_raw_count, new_raw_count; 1789 s64 new, old; 1790 1791 WARN_ON(!period); 1792 1793 /* 1794 * drain_pebs() only happens when the PMU is disabled. 1795 */ 1796 WARN_ON(this_cpu_read(cpu_hw_events.enabled)); 1797 1798 prev_raw_count = local64_read(&hwc->prev_count); 1799 rdpmcl(hwc->event_base_rdpmc, new_raw_count); 1800 local64_set(&hwc->prev_count, new_raw_count); 1801 1802 /* 1803 * Since the counter increments a negative counter value and 1804 * overflows on the sign switch, giving the interval: 1805 * 1806 * [-period, 0] 1807 * 1808 * the difference between two consequtive reads is: 1809 * 1810 * A) value2 - value1; 1811 * when no overflows have happened in between, 1812 * 1813 * B) (0 - value1) + (value2 - (-period)); 1814 * when one overflow happened in between, 1815 * 1816 * C) (0 - value1) + (n - 1) * (period) + (value2 - (-period)); 1817 * when @n overflows happened in between. 1818 * 1819 * Here A) is the obvious difference, B) is the extension to the 1820 * discrete interval, where the first term is to the top of the 1821 * interval and the second term is from the bottom of the next 1822 * interval and C) the extension to multiple intervals, where the 1823 * middle term is the whole intervals covered. 1824 * 1825 * An equivalent of C, by reduction, is: 1826 * 1827 * value2 - value1 + n * period 1828 */ 1829 new = ((s64)(new_raw_count << shift) >> shift); 1830 old = ((s64)(prev_raw_count << shift) >> shift); 1831 local64_add(new - old + count * period, &event->count); 1832 1833 local64_set(&hwc->period_left, -new); 1834 1835 perf_event_update_userpage(event); 1836 1837 return 0; 1838 } 1839 1840 static __always_inline void 1841 __intel_pmu_pebs_event(struct perf_event *event, 1842 struct pt_regs *iregs, 1843 struct perf_sample_data *data, 1844 void *base, void *top, 1845 int bit, int count, 1846 void (*setup_sample)(struct perf_event *, 1847 struct pt_regs *, 1848 void *, 1849 struct perf_sample_data *, 1850 struct pt_regs *)) 1851 { 1852 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1853 struct hw_perf_event *hwc = &event->hw; 1854 struct x86_perf_regs perf_regs; 1855 struct pt_regs *regs = &perf_regs.regs; 1856 void *at = get_next_pebs_record_by_bit(base, top, bit); 1857 static struct pt_regs dummy_iregs; 1858 1859 if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) { 1860 /* 1861 * Now, auto-reload is only enabled in fixed period mode. 1862 * The reload value is always hwc->sample_period. 1863 * May need to change it, if auto-reload is enabled in 1864 * freq mode later. 1865 */ 1866 intel_pmu_save_and_restart_reload(event, count); 1867 } else if (!intel_pmu_save_and_restart(event)) 1868 return; 1869 1870 if (!iregs) 1871 iregs = &dummy_iregs; 1872 1873 while (count > 1) { 1874 setup_sample(event, iregs, at, data, regs); 1875 perf_event_output(event, data, regs); 1876 at += cpuc->pebs_record_size; 1877 at = get_next_pebs_record_by_bit(at, top, bit); 1878 count--; 1879 } 1880 1881 setup_sample(event, iregs, at, data, regs); 1882 if (iregs == &dummy_iregs) { 1883 /* 1884 * The PEBS records may be drained in the non-overflow context, 1885 * e.g., large PEBS + context switch. Perf should treat the 1886 * last record the same as other PEBS records, and doesn't 1887 * invoke the generic overflow handler. 1888 */ 1889 perf_event_output(event, data, regs); 1890 } else { 1891 /* 1892 * All but the last records are processed. 1893 * The last one is left to be able to call the overflow handler. 1894 */ 1895 if (perf_event_overflow(event, data, regs)) 1896 x86_pmu_stop(event, 0); 1897 } 1898 } 1899 1900 static void intel_pmu_drain_pebs_core(struct pt_regs *iregs, struct perf_sample_data *data) 1901 { 1902 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1903 struct debug_store *ds = cpuc->ds; 1904 struct perf_event *event = cpuc->events[0]; /* PMC0 only */ 1905 struct pebs_record_core *at, *top; 1906 int n; 1907 1908 if (!x86_pmu.pebs_active) 1909 return; 1910 1911 at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base; 1912 top = (struct pebs_record_core *)(unsigned long)ds->pebs_index; 1913 1914 /* 1915 * Whatever else happens, drain the thing 1916 */ 1917 ds->pebs_index = ds->pebs_buffer_base; 1918 1919 if (!test_bit(0, cpuc->active_mask)) 1920 return; 1921 1922 WARN_ON_ONCE(!event); 1923 1924 if (!event->attr.precise_ip) 1925 return; 1926 1927 n = top - at; 1928 if (n <= 0) { 1929 if (event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD) 1930 intel_pmu_save_and_restart_reload(event, 0); 1931 return; 1932 } 1933 1934 __intel_pmu_pebs_event(event, iregs, data, at, top, 0, n, 1935 setup_pebs_fixed_sample_data); 1936 } 1937 1938 static void intel_pmu_pebs_event_update_no_drain(struct cpu_hw_events *cpuc, int size) 1939 { 1940 struct perf_event *event; 1941 int bit; 1942 1943 /* 1944 * The drain_pebs() could be called twice in a short period 1945 * for auto-reload event in pmu::read(). There are no 1946 * overflows have happened in between. 1947 * It needs to call intel_pmu_save_and_restart_reload() to 1948 * update the event->count for this case. 1949 */ 1950 for_each_set_bit(bit, (unsigned long *)&cpuc->pebs_enabled, size) { 1951 event = cpuc->events[bit]; 1952 if (event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD) 1953 intel_pmu_save_and_restart_reload(event, 0); 1954 } 1955 } 1956 1957 static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs, struct perf_sample_data *data) 1958 { 1959 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1960 struct debug_store *ds = cpuc->ds; 1961 struct perf_event *event; 1962 void *base, *at, *top; 1963 short counts[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; 1964 short error[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; 1965 int bit, i, size; 1966 u64 mask; 1967 1968 if (!x86_pmu.pebs_active) 1969 return; 1970 1971 base = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base; 1972 top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index; 1973 1974 ds->pebs_index = ds->pebs_buffer_base; 1975 1976 mask = (1ULL << x86_pmu.max_pebs_events) - 1; 1977 size = x86_pmu.max_pebs_events; 1978 if (x86_pmu.flags & PMU_FL_PEBS_ALL) { 1979 mask |= ((1ULL << x86_pmu.num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED; 1980 size = INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed; 1981 } 1982 1983 if (unlikely(base >= top)) { 1984 intel_pmu_pebs_event_update_no_drain(cpuc, size); 1985 return; 1986 } 1987 1988 for (at = base; at < top; at += x86_pmu.pebs_record_size) { 1989 struct pebs_record_nhm *p = at; 1990 u64 pebs_status; 1991 1992 pebs_status = p->status & cpuc->pebs_enabled; 1993 pebs_status &= mask; 1994 1995 /* PEBS v3 has more accurate status bits */ 1996 if (x86_pmu.intel_cap.pebs_format >= 3) { 1997 for_each_set_bit(bit, (unsigned long *)&pebs_status, size) 1998 counts[bit]++; 1999 2000 continue; 2001 } 2002 2003 /* 2004 * On some CPUs the PEBS status can be zero when PEBS is 2005 * racing with clearing of GLOBAL_STATUS. 2006 * 2007 * Normally we would drop that record, but in the 2008 * case when there is only a single active PEBS event 2009 * we can assume it's for that event. 2010 */ 2011 if (!pebs_status && cpuc->pebs_enabled && 2012 !(cpuc->pebs_enabled & (cpuc->pebs_enabled-1))) 2013 pebs_status = cpuc->pebs_enabled; 2014 2015 bit = find_first_bit((unsigned long *)&pebs_status, 2016 x86_pmu.max_pebs_events); 2017 if (bit >= x86_pmu.max_pebs_events) 2018 continue; 2019 2020 /* 2021 * The PEBS hardware does not deal well with the situation 2022 * when events happen near to each other and multiple bits 2023 * are set. But it should happen rarely. 2024 * 2025 * If these events include one PEBS and multiple non-PEBS 2026 * events, it doesn't impact PEBS record. The record will 2027 * be handled normally. (slow path) 2028 * 2029 * If these events include two or more PEBS events, the 2030 * records for the events can be collapsed into a single 2031 * one, and it's not possible to reconstruct all events 2032 * that caused the PEBS record. It's called collision. 2033 * If collision happened, the record will be dropped. 2034 */ 2035 if (pebs_status != (1ULL << bit)) { 2036 for_each_set_bit(i, (unsigned long *)&pebs_status, size) 2037 error[i]++; 2038 continue; 2039 } 2040 2041 counts[bit]++; 2042 } 2043 2044 for_each_set_bit(bit, (unsigned long *)&mask, size) { 2045 if ((counts[bit] == 0) && (error[bit] == 0)) 2046 continue; 2047 2048 event = cpuc->events[bit]; 2049 if (WARN_ON_ONCE(!event)) 2050 continue; 2051 2052 if (WARN_ON_ONCE(!event->attr.precise_ip)) 2053 continue; 2054 2055 /* log dropped samples number */ 2056 if (error[bit]) { 2057 perf_log_lost_samples(event, error[bit]); 2058 2059 if (iregs && perf_event_account_interrupt(event)) 2060 x86_pmu_stop(event, 0); 2061 } 2062 2063 if (counts[bit]) { 2064 __intel_pmu_pebs_event(event, iregs, data, base, 2065 top, bit, counts[bit], 2066 setup_pebs_fixed_sample_data); 2067 } 2068 } 2069 } 2070 2071 static void intel_pmu_drain_pebs_icl(struct pt_regs *iregs, struct perf_sample_data *data) 2072 { 2073 short counts[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; 2074 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 2075 struct debug_store *ds = cpuc->ds; 2076 struct perf_event *event; 2077 void *base, *at, *top; 2078 int bit, size; 2079 u64 mask; 2080 2081 if (!x86_pmu.pebs_active) 2082 return; 2083 2084 base = (struct pebs_basic *)(unsigned long)ds->pebs_buffer_base; 2085 top = (struct pebs_basic *)(unsigned long)ds->pebs_index; 2086 2087 ds->pebs_index = ds->pebs_buffer_base; 2088 2089 mask = ((1ULL << x86_pmu.max_pebs_events) - 1) | 2090 (((1ULL << x86_pmu.num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED); 2091 size = INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed; 2092 2093 if (unlikely(base >= top)) { 2094 intel_pmu_pebs_event_update_no_drain(cpuc, size); 2095 return; 2096 } 2097 2098 for (at = base; at < top; at += cpuc->pebs_record_size) { 2099 u64 pebs_status; 2100 2101 pebs_status = get_pebs_status(at) & cpuc->pebs_enabled; 2102 pebs_status &= mask; 2103 2104 for_each_set_bit(bit, (unsigned long *)&pebs_status, size) 2105 counts[bit]++; 2106 } 2107 2108 for_each_set_bit(bit, (unsigned long *)&mask, size) { 2109 if (counts[bit] == 0) 2110 continue; 2111 2112 event = cpuc->events[bit]; 2113 if (WARN_ON_ONCE(!event)) 2114 continue; 2115 2116 if (WARN_ON_ONCE(!event->attr.precise_ip)) 2117 continue; 2118 2119 __intel_pmu_pebs_event(event, iregs, data, base, 2120 top, bit, counts[bit], 2121 setup_pebs_adaptive_sample_data); 2122 } 2123 } 2124 2125 /* 2126 * BTS, PEBS probe and setup 2127 */ 2128 2129 void __init intel_ds_init(void) 2130 { 2131 /* 2132 * No support for 32bit formats 2133 */ 2134 if (!boot_cpu_has(X86_FEATURE_DTES64)) 2135 return; 2136 2137 x86_pmu.bts = boot_cpu_has(X86_FEATURE_BTS); 2138 x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS); 2139 x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE; 2140 if (x86_pmu.version <= 4) 2141 x86_pmu.pebs_no_isolation = 1; 2142 2143 if (x86_pmu.pebs) { 2144 char pebs_type = x86_pmu.intel_cap.pebs_trap ? '+' : '-'; 2145 char *pebs_qual = ""; 2146 int format = x86_pmu.intel_cap.pebs_format; 2147 2148 if (format < 4) 2149 x86_pmu.intel_cap.pebs_baseline = 0; 2150 2151 switch (format) { 2152 case 0: 2153 pr_cont("PEBS fmt0%c, ", pebs_type); 2154 x86_pmu.pebs_record_size = sizeof(struct pebs_record_core); 2155 /* 2156 * Using >PAGE_SIZE buffers makes the WRMSR to 2157 * PERF_GLOBAL_CTRL in intel_pmu_enable_all() 2158 * mysteriously hang on Core2. 2159 * 2160 * As a workaround, we don't do this. 2161 */ 2162 x86_pmu.pebs_buffer_size = PAGE_SIZE; 2163 x86_pmu.drain_pebs = intel_pmu_drain_pebs_core; 2164 break; 2165 2166 case 1: 2167 pr_cont("PEBS fmt1%c, ", pebs_type); 2168 x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm); 2169 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 2170 break; 2171 2172 case 2: 2173 pr_cont("PEBS fmt2%c, ", pebs_type); 2174 x86_pmu.pebs_record_size = sizeof(struct pebs_record_hsw); 2175 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 2176 break; 2177 2178 case 3: 2179 pr_cont("PEBS fmt3%c, ", pebs_type); 2180 x86_pmu.pebs_record_size = 2181 sizeof(struct pebs_record_skl); 2182 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 2183 x86_pmu.large_pebs_flags |= PERF_SAMPLE_TIME; 2184 break; 2185 2186 case 4: 2187 x86_pmu.drain_pebs = intel_pmu_drain_pebs_icl; 2188 x86_pmu.pebs_record_size = sizeof(struct pebs_basic); 2189 if (x86_pmu.intel_cap.pebs_baseline) { 2190 x86_pmu.large_pebs_flags |= 2191 PERF_SAMPLE_BRANCH_STACK | 2192 PERF_SAMPLE_TIME; 2193 x86_pmu.flags |= PMU_FL_PEBS_ALL; 2194 pebs_qual = "-baseline"; 2195 x86_get_pmu()->capabilities |= PERF_PMU_CAP_EXTENDED_REGS; 2196 } else { 2197 /* Only basic record supported */ 2198 x86_pmu.large_pebs_flags &= 2199 ~(PERF_SAMPLE_ADDR | 2200 PERF_SAMPLE_TIME | 2201 PERF_SAMPLE_DATA_SRC | 2202 PERF_SAMPLE_TRANSACTION | 2203 PERF_SAMPLE_REGS_USER | 2204 PERF_SAMPLE_REGS_INTR); 2205 } 2206 pr_cont("PEBS fmt4%c%s, ", pebs_type, pebs_qual); 2207 2208 if (x86_pmu.intel_cap.pebs_output_pt_available) { 2209 pr_cont("PEBS-via-PT, "); 2210 x86_get_pmu()->capabilities |= PERF_PMU_CAP_AUX_OUTPUT; 2211 } 2212 2213 break; 2214 2215 default: 2216 pr_cont("no PEBS fmt%d%c, ", format, pebs_type); 2217 x86_pmu.pebs = 0; 2218 } 2219 } 2220 } 2221 2222 void perf_restore_debug_store(void) 2223 { 2224 struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds); 2225 2226 if (!x86_pmu.bts && !x86_pmu.pebs) 2227 return; 2228 2229 wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds); 2230 } 2231