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_grt_pebs_event_constraints[] = { 783 /* Allow all events as PEBS with no flags */ 784 INTEL_PLD_CONSTRAINT(0x5d0, 0xf), 785 INTEL_PSD_CONSTRAINT(0x6d0, 0xf), 786 EVENT_CONSTRAINT_END 787 }; 788 789 struct event_constraint intel_nehalem_pebs_event_constraints[] = { 790 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ 791 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ 792 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ 793 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INST_RETIRED.ANY */ 794 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ 795 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ 796 INTEL_FLAGS_UEVENT_CONSTRAINT(0x02c5, 0xf), /* BR_MISP_RETIRED.NEAR_CALL */ 797 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ 798 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ 799 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ 800 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ 801 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 802 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x0f), 803 EVENT_CONSTRAINT_END 804 }; 805 806 struct event_constraint intel_westmere_pebs_event_constraints[] = { 807 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ 808 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ 809 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ 810 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INSTR_RETIRED.* */ 811 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ 812 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ 813 INTEL_FLAGS_EVENT_CONSTRAINT(0xc5, 0xf), /* BR_MISP_RETIRED.* */ 814 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ 815 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ 816 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ 817 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ 818 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 819 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x0f), 820 EVENT_CONSTRAINT_END 821 }; 822 823 struct event_constraint intel_snb_pebs_event_constraints[] = { 824 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 825 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ 826 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ 827 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 828 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 829 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ 830 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 831 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ 832 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ 833 /* Allow all events as PEBS with no flags */ 834 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 835 EVENT_CONSTRAINT_END 836 }; 837 838 struct event_constraint intel_ivb_pebs_event_constraints[] = { 839 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 840 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ 841 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ 842 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 843 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 844 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 845 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 846 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ 847 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 848 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ 849 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ 850 /* Allow all events as PEBS with no flags */ 851 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 852 EVENT_CONSTRAINT_END 853 }; 854 855 struct event_constraint intel_hsw_pebs_event_constraints[] = { 856 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 857 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ 858 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 859 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 860 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 861 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 862 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ 863 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ 864 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ 865 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ 866 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ 867 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ 868 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ 869 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ 870 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 871 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ 872 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ 873 /* Allow all events as PEBS with no flags */ 874 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 875 EVENT_CONSTRAINT_END 876 }; 877 878 struct event_constraint intel_bdw_pebs_event_constraints[] = { 879 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 880 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ 881 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 882 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c2, 0xf), 883 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 884 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 885 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ 886 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ 887 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ 888 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ 889 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ 890 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ 891 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ 892 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ 893 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 894 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ 895 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ 896 /* Allow all events as PEBS with no flags */ 897 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 898 EVENT_CONSTRAINT_END 899 }; 900 901 902 struct event_constraint intel_skl_pebs_event_constraints[] = { 903 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2), /* INST_RETIRED.PREC_DIST */ 904 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 905 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108001c0, 0x2), 906 /* INST_RETIRED.TOTAL_CYCLES_PS (inv=1, cmask=16) (cycles:p). */ 907 INTEL_FLAGS_UEVENT_CONSTRAINT(0x108000c0, 0x0f), 908 INTEL_PLD_CONSTRAINT(0x1cd, 0xf), /* MEM_TRANS_RETIRED.* */ 909 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */ 910 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */ 911 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_INST_RETIRED.LOCK_LOADS */ 912 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x22d0, 0xf), /* MEM_INST_RETIRED.LOCK_STORES */ 913 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_INST_RETIRED.SPLIT_LOADS */ 914 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_INST_RETIRED.SPLIT_STORES */ 915 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_INST_RETIRED.ALL_LOADS */ 916 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_INST_RETIRED.ALL_STORES */ 917 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_RETIRED.* */ 918 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_L3_HIT_RETIRED.* */ 919 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_L3_MISS_RETIRED.* */ 920 /* Allow all events as PEBS with no flags */ 921 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 922 EVENT_CONSTRAINT_END 923 }; 924 925 struct event_constraint intel_icl_pebs_event_constraints[] = { 926 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL), /* INST_RETIRED.PREC_DIST */ 927 INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL), /* SLOTS */ 928 929 INTEL_PLD_CONSTRAINT(0x1cd, 0xff), /* MEM_TRANS_RETIRED.LOAD_LATENCY */ 930 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x1d0, 0xf), /* MEM_INST_RETIRED.LOAD */ 931 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x2d0, 0xf), /* MEM_INST_RETIRED.STORE */ 932 933 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD_RANGE(0xd1, 0xd4, 0xf), /* MEM_LOAD_*_RETIRED.* */ 934 935 INTEL_FLAGS_EVENT_CONSTRAINT(0xd0, 0xf), /* MEM_INST_RETIRED.* */ 936 937 /* 938 * Everything else is handled by PMU_FL_PEBS_ALL, because we 939 * need the full constraints from the main table. 940 */ 941 942 EVENT_CONSTRAINT_END 943 }; 944 945 struct event_constraint intel_spr_pebs_event_constraints[] = { 946 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x100000000ULL), 947 INTEL_FLAGS_UEVENT_CONSTRAINT(0x0400, 0x800000000ULL), 948 949 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xfe), 950 INTEL_PLD_CONSTRAINT(0x1cd, 0xfe), 951 INTEL_PSD_CONSTRAINT(0x2cd, 0x1), 952 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x1d0, 0xf), 953 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x2d0, 0xf), 954 955 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD_RANGE(0xd1, 0xd4, 0xf), 956 957 INTEL_FLAGS_EVENT_CONSTRAINT(0xd0, 0xf), 958 959 /* 960 * Everything else is handled by PMU_FL_PEBS_ALL, because we 961 * need the full constraints from the main table. 962 */ 963 964 EVENT_CONSTRAINT_END 965 }; 966 967 struct event_constraint *intel_pebs_constraints(struct perf_event *event) 968 { 969 struct event_constraint *pebs_constraints = hybrid(event->pmu, pebs_constraints); 970 struct event_constraint *c; 971 972 if (!event->attr.precise_ip) 973 return NULL; 974 975 if (pebs_constraints) { 976 for_each_event_constraint(c, pebs_constraints) { 977 if (constraint_match(c, event->hw.config)) { 978 event->hw.flags |= c->flags; 979 return c; 980 } 981 } 982 } 983 984 /* 985 * Extended PEBS support 986 * Makes the PEBS code search the normal constraints. 987 */ 988 if (x86_pmu.flags & PMU_FL_PEBS_ALL) 989 return NULL; 990 991 return &emptyconstraint; 992 } 993 994 /* 995 * We need the sched_task callback even for per-cpu events when we use 996 * the large interrupt threshold, such that we can provide PID and TID 997 * to PEBS samples. 998 */ 999 static inline bool pebs_needs_sched_cb(struct cpu_hw_events *cpuc) 1000 { 1001 if (cpuc->n_pebs == cpuc->n_pebs_via_pt) 1002 return false; 1003 1004 return cpuc->n_pebs && (cpuc->n_pebs == cpuc->n_large_pebs); 1005 } 1006 1007 void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in) 1008 { 1009 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1010 1011 if (!sched_in && pebs_needs_sched_cb(cpuc)) 1012 intel_pmu_drain_pebs_buffer(); 1013 } 1014 1015 static inline void pebs_update_threshold(struct cpu_hw_events *cpuc) 1016 { 1017 struct debug_store *ds = cpuc->ds; 1018 int max_pebs_events = hybrid(cpuc->pmu, max_pebs_events); 1019 int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); 1020 u64 threshold; 1021 int reserved; 1022 1023 if (cpuc->n_pebs_via_pt) 1024 return; 1025 1026 if (x86_pmu.flags & PMU_FL_PEBS_ALL) 1027 reserved = max_pebs_events + num_counters_fixed; 1028 else 1029 reserved = max_pebs_events; 1030 1031 if (cpuc->n_pebs == cpuc->n_large_pebs) { 1032 threshold = ds->pebs_absolute_maximum - 1033 reserved * cpuc->pebs_record_size; 1034 } else { 1035 threshold = ds->pebs_buffer_base + cpuc->pebs_record_size; 1036 } 1037 1038 ds->pebs_interrupt_threshold = threshold; 1039 } 1040 1041 static void adaptive_pebs_record_size_update(void) 1042 { 1043 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1044 u64 pebs_data_cfg = cpuc->pebs_data_cfg; 1045 int sz = sizeof(struct pebs_basic); 1046 1047 if (pebs_data_cfg & PEBS_DATACFG_MEMINFO) 1048 sz += sizeof(struct pebs_meminfo); 1049 if (pebs_data_cfg & PEBS_DATACFG_GP) 1050 sz += sizeof(struct pebs_gprs); 1051 if (pebs_data_cfg & PEBS_DATACFG_XMMS) 1052 sz += sizeof(struct pebs_xmm); 1053 if (pebs_data_cfg & PEBS_DATACFG_LBRS) 1054 sz += x86_pmu.lbr_nr * sizeof(struct lbr_entry); 1055 1056 cpuc->pebs_record_size = sz; 1057 } 1058 1059 #define PERF_PEBS_MEMINFO_TYPE (PERF_SAMPLE_ADDR | PERF_SAMPLE_DATA_SRC | \ 1060 PERF_SAMPLE_PHYS_ADDR | \ 1061 PERF_SAMPLE_WEIGHT_TYPE | \ 1062 PERF_SAMPLE_TRANSACTION | \ 1063 PERF_SAMPLE_DATA_PAGE_SIZE) 1064 1065 static u64 pebs_update_adaptive_cfg(struct perf_event *event) 1066 { 1067 struct perf_event_attr *attr = &event->attr; 1068 u64 sample_type = attr->sample_type; 1069 u64 pebs_data_cfg = 0; 1070 bool gprs, tsx_weight; 1071 1072 if (!(sample_type & ~(PERF_SAMPLE_IP|PERF_SAMPLE_TIME)) && 1073 attr->precise_ip > 1) 1074 return pebs_data_cfg; 1075 1076 if (sample_type & PERF_PEBS_MEMINFO_TYPE) 1077 pebs_data_cfg |= PEBS_DATACFG_MEMINFO; 1078 1079 /* 1080 * We need GPRs when: 1081 * + user requested them 1082 * + precise_ip < 2 for the non event IP 1083 * + For RTM TSX weight we need GPRs for the abort code. 1084 */ 1085 gprs = (sample_type & PERF_SAMPLE_REGS_INTR) && 1086 (attr->sample_regs_intr & PEBS_GP_REGS); 1087 1088 tsx_weight = (sample_type & PERF_SAMPLE_WEIGHT_TYPE) && 1089 ((attr->config & INTEL_ARCH_EVENT_MASK) == 1090 x86_pmu.rtm_abort_event); 1091 1092 if (gprs || (attr->precise_ip < 2) || tsx_weight) 1093 pebs_data_cfg |= PEBS_DATACFG_GP; 1094 1095 if ((sample_type & PERF_SAMPLE_REGS_INTR) && 1096 (attr->sample_regs_intr & PERF_REG_EXTENDED_MASK)) 1097 pebs_data_cfg |= PEBS_DATACFG_XMMS; 1098 1099 if (sample_type & PERF_SAMPLE_BRANCH_STACK) { 1100 /* 1101 * For now always log all LBRs. Could configure this 1102 * later. 1103 */ 1104 pebs_data_cfg |= PEBS_DATACFG_LBRS | 1105 ((x86_pmu.lbr_nr-1) << PEBS_DATACFG_LBR_SHIFT); 1106 } 1107 1108 return pebs_data_cfg; 1109 } 1110 1111 static void 1112 pebs_update_state(bool needed_cb, struct cpu_hw_events *cpuc, 1113 struct perf_event *event, bool add) 1114 { 1115 struct pmu *pmu = event->ctx->pmu; 1116 /* 1117 * Make sure we get updated with the first PEBS 1118 * event. It will trigger also during removal, but 1119 * that does not hurt: 1120 */ 1121 bool update = cpuc->n_pebs == 1; 1122 1123 if (needed_cb != pebs_needs_sched_cb(cpuc)) { 1124 if (!needed_cb) 1125 perf_sched_cb_inc(pmu); 1126 else 1127 perf_sched_cb_dec(pmu); 1128 1129 update = true; 1130 } 1131 1132 /* 1133 * The PEBS record doesn't shrink on pmu::del(). Doing so would require 1134 * iterating all remaining PEBS events to reconstruct the config. 1135 */ 1136 if (x86_pmu.intel_cap.pebs_baseline && add) { 1137 u64 pebs_data_cfg; 1138 1139 /* Clear pebs_data_cfg and pebs_record_size for first PEBS. */ 1140 if (cpuc->n_pebs == 1) { 1141 cpuc->pebs_data_cfg = 0; 1142 cpuc->pebs_record_size = sizeof(struct pebs_basic); 1143 } 1144 1145 pebs_data_cfg = pebs_update_adaptive_cfg(event); 1146 1147 /* Update pebs_record_size if new event requires more data. */ 1148 if (pebs_data_cfg & ~cpuc->pebs_data_cfg) { 1149 cpuc->pebs_data_cfg |= pebs_data_cfg; 1150 adaptive_pebs_record_size_update(); 1151 update = true; 1152 } 1153 } 1154 1155 if (update) 1156 pebs_update_threshold(cpuc); 1157 } 1158 1159 void intel_pmu_pebs_add(struct perf_event *event) 1160 { 1161 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1162 struct hw_perf_event *hwc = &event->hw; 1163 bool needed_cb = pebs_needs_sched_cb(cpuc); 1164 1165 cpuc->n_pebs++; 1166 if (hwc->flags & PERF_X86_EVENT_LARGE_PEBS) 1167 cpuc->n_large_pebs++; 1168 if (hwc->flags & PERF_X86_EVENT_PEBS_VIA_PT) 1169 cpuc->n_pebs_via_pt++; 1170 1171 pebs_update_state(needed_cb, cpuc, event, true); 1172 } 1173 1174 static void intel_pmu_pebs_via_pt_disable(struct perf_event *event) 1175 { 1176 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1177 1178 if (!is_pebs_pt(event)) 1179 return; 1180 1181 if (!(cpuc->pebs_enabled & ~PEBS_VIA_PT_MASK)) 1182 cpuc->pebs_enabled &= ~PEBS_VIA_PT_MASK; 1183 } 1184 1185 static void intel_pmu_pebs_via_pt_enable(struct perf_event *event) 1186 { 1187 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1188 struct hw_perf_event *hwc = &event->hw; 1189 struct debug_store *ds = cpuc->ds; 1190 1191 if (!is_pebs_pt(event)) 1192 return; 1193 1194 if (!(event->hw.flags & PERF_X86_EVENT_LARGE_PEBS)) 1195 cpuc->pebs_enabled |= PEBS_PMI_AFTER_EACH_RECORD; 1196 1197 cpuc->pebs_enabled |= PEBS_OUTPUT_PT; 1198 1199 wrmsrl(MSR_RELOAD_PMC0 + hwc->idx, ds->pebs_event_reset[hwc->idx]); 1200 } 1201 1202 void intel_pmu_pebs_enable(struct perf_event *event) 1203 { 1204 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1205 struct hw_perf_event *hwc = &event->hw; 1206 struct debug_store *ds = cpuc->ds; 1207 1208 hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT; 1209 1210 cpuc->pebs_enabled |= 1ULL << hwc->idx; 1211 1212 if ((event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) && (x86_pmu.version < 5)) 1213 cpuc->pebs_enabled |= 1ULL << (hwc->idx + 32); 1214 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) 1215 cpuc->pebs_enabled |= 1ULL << 63; 1216 1217 if (x86_pmu.intel_cap.pebs_baseline) { 1218 hwc->config |= ICL_EVENTSEL_ADAPTIVE; 1219 if (cpuc->pebs_data_cfg != cpuc->active_pebs_data_cfg) { 1220 wrmsrl(MSR_PEBS_DATA_CFG, cpuc->pebs_data_cfg); 1221 cpuc->active_pebs_data_cfg = cpuc->pebs_data_cfg; 1222 } 1223 } 1224 1225 /* 1226 * Use auto-reload if possible to save a MSR write in the PMI. 1227 * This must be done in pmu::start(), because PERF_EVENT_IOC_PERIOD. 1228 */ 1229 if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) { 1230 unsigned int idx = hwc->idx; 1231 1232 if (idx >= INTEL_PMC_IDX_FIXED) 1233 idx = MAX_PEBS_EVENTS + (idx - INTEL_PMC_IDX_FIXED); 1234 ds->pebs_event_reset[idx] = 1235 (u64)(-hwc->sample_period) & x86_pmu.cntval_mask; 1236 } else { 1237 ds->pebs_event_reset[hwc->idx] = 0; 1238 } 1239 1240 intel_pmu_pebs_via_pt_enable(event); 1241 } 1242 1243 void intel_pmu_pebs_del(struct perf_event *event) 1244 { 1245 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1246 struct hw_perf_event *hwc = &event->hw; 1247 bool needed_cb = pebs_needs_sched_cb(cpuc); 1248 1249 cpuc->n_pebs--; 1250 if (hwc->flags & PERF_X86_EVENT_LARGE_PEBS) 1251 cpuc->n_large_pebs--; 1252 if (hwc->flags & PERF_X86_EVENT_PEBS_VIA_PT) 1253 cpuc->n_pebs_via_pt--; 1254 1255 pebs_update_state(needed_cb, cpuc, event, false); 1256 } 1257 1258 void intel_pmu_pebs_disable(struct perf_event *event) 1259 { 1260 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1261 struct hw_perf_event *hwc = &event->hw; 1262 1263 if (cpuc->n_pebs == cpuc->n_large_pebs && 1264 cpuc->n_pebs != cpuc->n_pebs_via_pt) 1265 intel_pmu_drain_pebs_buffer(); 1266 1267 cpuc->pebs_enabled &= ~(1ULL << hwc->idx); 1268 1269 if ((event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) && 1270 (x86_pmu.version < 5)) 1271 cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32)); 1272 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) 1273 cpuc->pebs_enabled &= ~(1ULL << 63); 1274 1275 intel_pmu_pebs_via_pt_disable(event); 1276 1277 if (cpuc->enabled) 1278 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); 1279 1280 hwc->config |= ARCH_PERFMON_EVENTSEL_INT; 1281 } 1282 1283 void intel_pmu_pebs_enable_all(void) 1284 { 1285 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1286 1287 if (cpuc->pebs_enabled) 1288 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); 1289 } 1290 1291 void intel_pmu_pebs_disable_all(void) 1292 { 1293 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1294 1295 if (cpuc->pebs_enabled) 1296 wrmsrl(MSR_IA32_PEBS_ENABLE, 0); 1297 } 1298 1299 static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs) 1300 { 1301 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1302 unsigned long from = cpuc->lbr_entries[0].from; 1303 unsigned long old_to, to = cpuc->lbr_entries[0].to; 1304 unsigned long ip = regs->ip; 1305 int is_64bit = 0; 1306 void *kaddr; 1307 int size; 1308 1309 /* 1310 * We don't need to fixup if the PEBS assist is fault like 1311 */ 1312 if (!x86_pmu.intel_cap.pebs_trap) 1313 return 1; 1314 1315 /* 1316 * No LBR entry, no basic block, no rewinding 1317 */ 1318 if (!cpuc->lbr_stack.nr || !from || !to) 1319 return 0; 1320 1321 /* 1322 * Basic blocks should never cross user/kernel boundaries 1323 */ 1324 if (kernel_ip(ip) != kernel_ip(to)) 1325 return 0; 1326 1327 /* 1328 * unsigned math, either ip is before the start (impossible) or 1329 * the basic block is larger than 1 page (sanity) 1330 */ 1331 if ((ip - to) > PEBS_FIXUP_SIZE) 1332 return 0; 1333 1334 /* 1335 * We sampled a branch insn, rewind using the LBR stack 1336 */ 1337 if (ip == to) { 1338 set_linear_ip(regs, from); 1339 return 1; 1340 } 1341 1342 size = ip - to; 1343 if (!kernel_ip(ip)) { 1344 int bytes; 1345 u8 *buf = this_cpu_read(insn_buffer); 1346 1347 /* 'size' must fit our buffer, see above */ 1348 bytes = copy_from_user_nmi(buf, (void __user *)to, size); 1349 if (bytes != 0) 1350 return 0; 1351 1352 kaddr = buf; 1353 } else { 1354 kaddr = (void *)to; 1355 } 1356 1357 do { 1358 struct insn insn; 1359 1360 old_to = to; 1361 1362 #ifdef CONFIG_X86_64 1363 is_64bit = kernel_ip(to) || any_64bit_mode(regs); 1364 #endif 1365 insn_init(&insn, kaddr, size, is_64bit); 1366 1367 /* 1368 * Make sure there was not a problem decoding the instruction. 1369 * This is doubly important because we have an infinite loop if 1370 * insn.length=0. 1371 */ 1372 if (insn_get_length(&insn)) 1373 break; 1374 1375 to += insn.length; 1376 kaddr += insn.length; 1377 size -= insn.length; 1378 } while (to < ip); 1379 1380 if (to == ip) { 1381 set_linear_ip(regs, old_to); 1382 return 1; 1383 } 1384 1385 /* 1386 * Even though we decoded the basic block, the instruction stream 1387 * never matched the given IP, either the TO or the IP got corrupted. 1388 */ 1389 return 0; 1390 } 1391 1392 static inline u64 intel_get_tsx_weight(u64 tsx_tuning) 1393 { 1394 if (tsx_tuning) { 1395 union hsw_tsx_tuning tsx = { .value = tsx_tuning }; 1396 return tsx.cycles_last_block; 1397 } 1398 return 0; 1399 } 1400 1401 static inline u64 intel_get_tsx_transaction(u64 tsx_tuning, u64 ax) 1402 { 1403 u64 txn = (tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32; 1404 1405 /* For RTM XABORTs also log the abort code from AX */ 1406 if ((txn & PERF_TXN_TRANSACTION) && (ax & 1)) 1407 txn |= ((ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT; 1408 return txn; 1409 } 1410 1411 static inline u64 get_pebs_status(void *n) 1412 { 1413 if (x86_pmu.intel_cap.pebs_format < 4) 1414 return ((struct pebs_record_nhm *)n)->status; 1415 return ((struct pebs_basic *)n)->applicable_counters; 1416 } 1417 1418 #define PERF_X86_EVENT_PEBS_HSW_PREC \ 1419 (PERF_X86_EVENT_PEBS_ST_HSW | \ 1420 PERF_X86_EVENT_PEBS_LD_HSW | \ 1421 PERF_X86_EVENT_PEBS_NA_HSW) 1422 1423 static u64 get_data_src(struct perf_event *event, u64 aux) 1424 { 1425 u64 val = PERF_MEM_NA; 1426 int fl = event->hw.flags; 1427 bool fst = fl & (PERF_X86_EVENT_PEBS_ST | PERF_X86_EVENT_PEBS_HSW_PREC); 1428 1429 if (fl & PERF_X86_EVENT_PEBS_LDLAT) 1430 val = load_latency_data(aux); 1431 else if (fl & PERF_X86_EVENT_PEBS_STLAT) 1432 val = store_latency_data(aux); 1433 else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC)) 1434 val = precise_datala_hsw(event, aux); 1435 else if (fst) 1436 val = precise_store_data(aux); 1437 return val; 1438 } 1439 1440 #define PERF_SAMPLE_ADDR_TYPE (PERF_SAMPLE_ADDR | \ 1441 PERF_SAMPLE_PHYS_ADDR | \ 1442 PERF_SAMPLE_DATA_PAGE_SIZE) 1443 1444 static void setup_pebs_fixed_sample_data(struct perf_event *event, 1445 struct pt_regs *iregs, void *__pebs, 1446 struct perf_sample_data *data, 1447 struct pt_regs *regs) 1448 { 1449 /* 1450 * We cast to the biggest pebs_record but are careful not to 1451 * unconditionally access the 'extra' entries. 1452 */ 1453 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1454 struct pebs_record_skl *pebs = __pebs; 1455 u64 sample_type; 1456 int fll; 1457 1458 if (pebs == NULL) 1459 return; 1460 1461 sample_type = event->attr.sample_type; 1462 fll = event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT; 1463 1464 perf_sample_data_init(data, 0, event->hw.last_period); 1465 1466 data->period = event->hw.last_period; 1467 1468 /* 1469 * Use latency for weight (only avail with PEBS-LL) 1470 */ 1471 if (fll && (sample_type & PERF_SAMPLE_WEIGHT_TYPE)) 1472 data->weight.full = pebs->lat; 1473 1474 /* 1475 * data.data_src encodes the data source 1476 */ 1477 if (sample_type & PERF_SAMPLE_DATA_SRC) 1478 data->data_src.val = get_data_src(event, pebs->dse); 1479 1480 /* 1481 * We must however always use iregs for the unwinder to stay sane; the 1482 * record BP,SP,IP can point into thin air when the record is from a 1483 * previous PMI context or an (I)RET happened between the record and 1484 * PMI. 1485 */ 1486 if (sample_type & PERF_SAMPLE_CALLCHAIN) 1487 data->callchain = perf_callchain(event, iregs); 1488 1489 /* 1490 * We use the interrupt regs as a base because the PEBS record does not 1491 * contain a full regs set, specifically it seems to lack segment 1492 * descriptors, which get used by things like user_mode(). 1493 * 1494 * In the simple case fix up only the IP for PERF_SAMPLE_IP. 1495 */ 1496 *regs = *iregs; 1497 1498 /* 1499 * Initialize regs_>flags from PEBS, 1500 * Clear exact bit (which uses x86 EFLAGS Reserved bit 3), 1501 * i.e., do not rely on it being zero: 1502 */ 1503 regs->flags = pebs->flags & ~PERF_EFLAGS_EXACT; 1504 1505 if (sample_type & PERF_SAMPLE_REGS_INTR) { 1506 regs->ax = pebs->ax; 1507 regs->bx = pebs->bx; 1508 regs->cx = pebs->cx; 1509 regs->dx = pebs->dx; 1510 regs->si = pebs->si; 1511 regs->di = pebs->di; 1512 1513 regs->bp = pebs->bp; 1514 regs->sp = pebs->sp; 1515 1516 #ifndef CONFIG_X86_32 1517 regs->r8 = pebs->r8; 1518 regs->r9 = pebs->r9; 1519 regs->r10 = pebs->r10; 1520 regs->r11 = pebs->r11; 1521 regs->r12 = pebs->r12; 1522 regs->r13 = pebs->r13; 1523 regs->r14 = pebs->r14; 1524 regs->r15 = pebs->r15; 1525 #endif 1526 } 1527 1528 if (event->attr.precise_ip > 1) { 1529 /* 1530 * Haswell and later processors have an 'eventing IP' 1531 * (real IP) which fixes the off-by-1 skid in hardware. 1532 * Use it when precise_ip >= 2 : 1533 */ 1534 if (x86_pmu.intel_cap.pebs_format >= 2) { 1535 set_linear_ip(regs, pebs->real_ip); 1536 regs->flags |= PERF_EFLAGS_EXACT; 1537 } else { 1538 /* Otherwise, use PEBS off-by-1 IP: */ 1539 set_linear_ip(regs, pebs->ip); 1540 1541 /* 1542 * With precise_ip >= 2, try to fix up the off-by-1 IP 1543 * using the LBR. If successful, the fixup function 1544 * corrects regs->ip and calls set_linear_ip() on regs: 1545 */ 1546 if (intel_pmu_pebs_fixup_ip(regs)) 1547 regs->flags |= PERF_EFLAGS_EXACT; 1548 } 1549 } else { 1550 /* 1551 * When precise_ip == 1, return the PEBS off-by-1 IP, 1552 * no fixup attempted: 1553 */ 1554 set_linear_ip(regs, pebs->ip); 1555 } 1556 1557 1558 if ((sample_type & PERF_SAMPLE_ADDR_TYPE) && 1559 x86_pmu.intel_cap.pebs_format >= 1) 1560 data->addr = pebs->dla; 1561 1562 if (x86_pmu.intel_cap.pebs_format >= 2) { 1563 /* Only set the TSX weight when no memory weight. */ 1564 if ((sample_type & PERF_SAMPLE_WEIGHT_TYPE) && !fll) 1565 data->weight.full = intel_get_tsx_weight(pebs->tsx_tuning); 1566 1567 if (sample_type & PERF_SAMPLE_TRANSACTION) 1568 data->txn = intel_get_tsx_transaction(pebs->tsx_tuning, 1569 pebs->ax); 1570 } 1571 1572 /* 1573 * v3 supplies an accurate time stamp, so we use that 1574 * for the time stamp. 1575 * 1576 * We can only do this for the default trace clock. 1577 */ 1578 if (x86_pmu.intel_cap.pebs_format >= 3 && 1579 event->attr.use_clockid == 0) 1580 data->time = native_sched_clock_from_tsc(pebs->tsc); 1581 1582 if (has_branch_stack(event)) 1583 data->br_stack = &cpuc->lbr_stack; 1584 } 1585 1586 static void adaptive_pebs_save_regs(struct pt_regs *regs, 1587 struct pebs_gprs *gprs) 1588 { 1589 regs->ax = gprs->ax; 1590 regs->bx = gprs->bx; 1591 regs->cx = gprs->cx; 1592 regs->dx = gprs->dx; 1593 regs->si = gprs->si; 1594 regs->di = gprs->di; 1595 regs->bp = gprs->bp; 1596 regs->sp = gprs->sp; 1597 #ifndef CONFIG_X86_32 1598 regs->r8 = gprs->r8; 1599 regs->r9 = gprs->r9; 1600 regs->r10 = gprs->r10; 1601 regs->r11 = gprs->r11; 1602 regs->r12 = gprs->r12; 1603 regs->r13 = gprs->r13; 1604 regs->r14 = gprs->r14; 1605 regs->r15 = gprs->r15; 1606 #endif 1607 } 1608 1609 #define PEBS_LATENCY_MASK 0xffff 1610 #define PEBS_CACHE_LATENCY_OFFSET 32 1611 1612 /* 1613 * With adaptive PEBS the layout depends on what fields are configured. 1614 */ 1615 1616 static void setup_pebs_adaptive_sample_data(struct perf_event *event, 1617 struct pt_regs *iregs, void *__pebs, 1618 struct perf_sample_data *data, 1619 struct pt_regs *regs) 1620 { 1621 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1622 struct pebs_basic *basic = __pebs; 1623 void *next_record = basic + 1; 1624 u64 sample_type; 1625 u64 format_size; 1626 struct pebs_meminfo *meminfo = NULL; 1627 struct pebs_gprs *gprs = NULL; 1628 struct x86_perf_regs *perf_regs; 1629 1630 if (basic == NULL) 1631 return; 1632 1633 perf_regs = container_of(regs, struct x86_perf_regs, regs); 1634 perf_regs->xmm_regs = NULL; 1635 1636 sample_type = event->attr.sample_type; 1637 format_size = basic->format_size; 1638 perf_sample_data_init(data, 0, event->hw.last_period); 1639 data->period = event->hw.last_period; 1640 1641 if (event->attr.use_clockid == 0) 1642 data->time = native_sched_clock_from_tsc(basic->tsc); 1643 1644 /* 1645 * We must however always use iregs for the unwinder to stay sane; the 1646 * record BP,SP,IP can point into thin air when the record is from a 1647 * previous PMI context or an (I)RET happened between the record and 1648 * PMI. 1649 */ 1650 if (sample_type & PERF_SAMPLE_CALLCHAIN) 1651 data->callchain = perf_callchain(event, iregs); 1652 1653 *regs = *iregs; 1654 /* The ip in basic is EventingIP */ 1655 set_linear_ip(regs, basic->ip); 1656 regs->flags = PERF_EFLAGS_EXACT; 1657 1658 /* 1659 * The record for MEMINFO is in front of GP 1660 * But PERF_SAMPLE_TRANSACTION needs gprs->ax. 1661 * Save the pointer here but process later. 1662 */ 1663 if (format_size & PEBS_DATACFG_MEMINFO) { 1664 meminfo = next_record; 1665 next_record = meminfo + 1; 1666 } 1667 1668 if (format_size & PEBS_DATACFG_GP) { 1669 gprs = next_record; 1670 next_record = gprs + 1; 1671 1672 if (event->attr.precise_ip < 2) { 1673 set_linear_ip(regs, gprs->ip); 1674 regs->flags &= ~PERF_EFLAGS_EXACT; 1675 } 1676 1677 if (sample_type & PERF_SAMPLE_REGS_INTR) 1678 adaptive_pebs_save_regs(regs, gprs); 1679 } 1680 1681 if (format_size & PEBS_DATACFG_MEMINFO) { 1682 if (sample_type & PERF_SAMPLE_WEIGHT_TYPE) { 1683 u64 weight = meminfo->latency; 1684 1685 if (x86_pmu.flags & PMU_FL_INSTR_LATENCY) { 1686 data->weight.var2_w = weight & PEBS_LATENCY_MASK; 1687 weight >>= PEBS_CACHE_LATENCY_OFFSET; 1688 } 1689 1690 /* 1691 * Although meminfo::latency is defined as a u64, 1692 * only the lower 32 bits include the valid data 1693 * in practice on Ice Lake and earlier platforms. 1694 */ 1695 if (sample_type & PERF_SAMPLE_WEIGHT) { 1696 data->weight.full = weight ?: 1697 intel_get_tsx_weight(meminfo->tsx_tuning); 1698 } else { 1699 data->weight.var1_dw = (u32)(weight & PEBS_LATENCY_MASK) ?: 1700 intel_get_tsx_weight(meminfo->tsx_tuning); 1701 } 1702 } 1703 1704 if (sample_type & PERF_SAMPLE_DATA_SRC) 1705 data->data_src.val = get_data_src(event, meminfo->aux); 1706 1707 if (sample_type & PERF_SAMPLE_ADDR_TYPE) 1708 data->addr = meminfo->address; 1709 1710 if (sample_type & PERF_SAMPLE_TRANSACTION) 1711 data->txn = intel_get_tsx_transaction(meminfo->tsx_tuning, 1712 gprs ? gprs->ax : 0); 1713 } 1714 1715 if (format_size & PEBS_DATACFG_XMMS) { 1716 struct pebs_xmm *xmm = next_record; 1717 1718 next_record = xmm + 1; 1719 perf_regs->xmm_regs = xmm->xmm; 1720 } 1721 1722 if (format_size & PEBS_DATACFG_LBRS) { 1723 struct lbr_entry *lbr = next_record; 1724 int num_lbr = ((format_size >> PEBS_DATACFG_LBR_SHIFT) 1725 & 0xff) + 1; 1726 next_record = next_record + num_lbr * sizeof(struct lbr_entry); 1727 1728 if (has_branch_stack(event)) { 1729 intel_pmu_store_pebs_lbrs(lbr); 1730 data->br_stack = &cpuc->lbr_stack; 1731 } 1732 } 1733 1734 WARN_ONCE(next_record != __pebs + (format_size >> 48), 1735 "PEBS record size %llu, expected %llu, config %llx\n", 1736 format_size >> 48, 1737 (u64)(next_record - __pebs), 1738 basic->format_size); 1739 } 1740 1741 static inline void * 1742 get_next_pebs_record_by_bit(void *base, void *top, int bit) 1743 { 1744 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1745 void *at; 1746 u64 pebs_status; 1747 1748 /* 1749 * fmt0 does not have a status bitfield (does not use 1750 * perf_record_nhm format) 1751 */ 1752 if (x86_pmu.intel_cap.pebs_format < 1) 1753 return base; 1754 1755 if (base == NULL) 1756 return NULL; 1757 1758 for (at = base; at < top; at += cpuc->pebs_record_size) { 1759 unsigned long status = get_pebs_status(at); 1760 1761 if (test_bit(bit, (unsigned long *)&status)) { 1762 /* PEBS v3 has accurate status bits */ 1763 if (x86_pmu.intel_cap.pebs_format >= 3) 1764 return at; 1765 1766 if (status == (1 << bit)) 1767 return at; 1768 1769 /* clear non-PEBS bit and re-check */ 1770 pebs_status = status & cpuc->pebs_enabled; 1771 pebs_status &= PEBS_COUNTER_MASK; 1772 if (pebs_status == (1 << bit)) 1773 return at; 1774 } 1775 } 1776 return NULL; 1777 } 1778 1779 void intel_pmu_auto_reload_read(struct perf_event *event) 1780 { 1781 WARN_ON(!(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)); 1782 1783 perf_pmu_disable(event->pmu); 1784 intel_pmu_drain_pebs_buffer(); 1785 perf_pmu_enable(event->pmu); 1786 } 1787 1788 /* 1789 * Special variant of intel_pmu_save_and_restart() for auto-reload. 1790 */ 1791 static int 1792 intel_pmu_save_and_restart_reload(struct perf_event *event, int count) 1793 { 1794 struct hw_perf_event *hwc = &event->hw; 1795 int shift = 64 - x86_pmu.cntval_bits; 1796 u64 period = hwc->sample_period; 1797 u64 prev_raw_count, new_raw_count; 1798 s64 new, old; 1799 1800 WARN_ON(!period); 1801 1802 /* 1803 * drain_pebs() only happens when the PMU is disabled. 1804 */ 1805 WARN_ON(this_cpu_read(cpu_hw_events.enabled)); 1806 1807 prev_raw_count = local64_read(&hwc->prev_count); 1808 rdpmcl(hwc->event_base_rdpmc, new_raw_count); 1809 local64_set(&hwc->prev_count, new_raw_count); 1810 1811 /* 1812 * Since the counter increments a negative counter value and 1813 * overflows on the sign switch, giving the interval: 1814 * 1815 * [-period, 0] 1816 * 1817 * the difference between two consecutive reads is: 1818 * 1819 * A) value2 - value1; 1820 * when no overflows have happened in between, 1821 * 1822 * B) (0 - value1) + (value2 - (-period)); 1823 * when one overflow happened in between, 1824 * 1825 * C) (0 - value1) + (n - 1) * (period) + (value2 - (-period)); 1826 * when @n overflows happened in between. 1827 * 1828 * Here A) is the obvious difference, B) is the extension to the 1829 * discrete interval, where the first term is to the top of the 1830 * interval and the second term is from the bottom of the next 1831 * interval and C) the extension to multiple intervals, where the 1832 * middle term is the whole intervals covered. 1833 * 1834 * An equivalent of C, by reduction, is: 1835 * 1836 * value2 - value1 + n * period 1837 */ 1838 new = ((s64)(new_raw_count << shift) >> shift); 1839 old = ((s64)(prev_raw_count << shift) >> shift); 1840 local64_add(new - old + count * period, &event->count); 1841 1842 local64_set(&hwc->period_left, -new); 1843 1844 perf_event_update_userpage(event); 1845 1846 return 0; 1847 } 1848 1849 static __always_inline void 1850 __intel_pmu_pebs_event(struct perf_event *event, 1851 struct pt_regs *iregs, 1852 struct perf_sample_data *data, 1853 void *base, void *top, 1854 int bit, int count, 1855 void (*setup_sample)(struct perf_event *, 1856 struct pt_regs *, 1857 void *, 1858 struct perf_sample_data *, 1859 struct pt_regs *)) 1860 { 1861 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1862 struct hw_perf_event *hwc = &event->hw; 1863 struct x86_perf_regs perf_regs; 1864 struct pt_regs *regs = &perf_regs.regs; 1865 void *at = get_next_pebs_record_by_bit(base, top, bit); 1866 static struct pt_regs dummy_iregs; 1867 1868 if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) { 1869 /* 1870 * Now, auto-reload is only enabled in fixed period mode. 1871 * The reload value is always hwc->sample_period. 1872 * May need to change it, if auto-reload is enabled in 1873 * freq mode later. 1874 */ 1875 intel_pmu_save_and_restart_reload(event, count); 1876 } else if (!intel_pmu_save_and_restart(event)) 1877 return; 1878 1879 if (!iregs) 1880 iregs = &dummy_iregs; 1881 1882 while (count > 1) { 1883 setup_sample(event, iregs, at, data, regs); 1884 perf_event_output(event, data, regs); 1885 at += cpuc->pebs_record_size; 1886 at = get_next_pebs_record_by_bit(at, top, bit); 1887 count--; 1888 } 1889 1890 setup_sample(event, iregs, at, data, regs); 1891 if (iregs == &dummy_iregs) { 1892 /* 1893 * The PEBS records may be drained in the non-overflow context, 1894 * e.g., large PEBS + context switch. Perf should treat the 1895 * last record the same as other PEBS records, and doesn't 1896 * invoke the generic overflow handler. 1897 */ 1898 perf_event_output(event, data, regs); 1899 } else { 1900 /* 1901 * All but the last records are processed. 1902 * The last one is left to be able to call the overflow handler. 1903 */ 1904 if (perf_event_overflow(event, data, regs)) 1905 x86_pmu_stop(event, 0); 1906 } 1907 } 1908 1909 static void intel_pmu_drain_pebs_core(struct pt_regs *iregs, struct perf_sample_data *data) 1910 { 1911 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1912 struct debug_store *ds = cpuc->ds; 1913 struct perf_event *event = cpuc->events[0]; /* PMC0 only */ 1914 struct pebs_record_core *at, *top; 1915 int n; 1916 1917 if (!x86_pmu.pebs_active) 1918 return; 1919 1920 at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base; 1921 top = (struct pebs_record_core *)(unsigned long)ds->pebs_index; 1922 1923 /* 1924 * Whatever else happens, drain the thing 1925 */ 1926 ds->pebs_index = ds->pebs_buffer_base; 1927 1928 if (!test_bit(0, cpuc->active_mask)) 1929 return; 1930 1931 WARN_ON_ONCE(!event); 1932 1933 if (!event->attr.precise_ip) 1934 return; 1935 1936 n = top - at; 1937 if (n <= 0) { 1938 if (event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD) 1939 intel_pmu_save_and_restart_reload(event, 0); 1940 return; 1941 } 1942 1943 __intel_pmu_pebs_event(event, iregs, data, at, top, 0, n, 1944 setup_pebs_fixed_sample_data); 1945 } 1946 1947 static void intel_pmu_pebs_event_update_no_drain(struct cpu_hw_events *cpuc, int size) 1948 { 1949 struct perf_event *event; 1950 int bit; 1951 1952 /* 1953 * The drain_pebs() could be called twice in a short period 1954 * for auto-reload event in pmu::read(). There are no 1955 * overflows have happened in between. 1956 * It needs to call intel_pmu_save_and_restart_reload() to 1957 * update the event->count for this case. 1958 */ 1959 for_each_set_bit(bit, (unsigned long *)&cpuc->pebs_enabled, size) { 1960 event = cpuc->events[bit]; 1961 if (event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD) 1962 intel_pmu_save_and_restart_reload(event, 0); 1963 } 1964 } 1965 1966 static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs, struct perf_sample_data *data) 1967 { 1968 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1969 struct debug_store *ds = cpuc->ds; 1970 struct perf_event *event; 1971 void *base, *at, *top; 1972 short counts[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; 1973 short error[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; 1974 int bit, i, size; 1975 u64 mask; 1976 1977 if (!x86_pmu.pebs_active) 1978 return; 1979 1980 base = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base; 1981 top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index; 1982 1983 ds->pebs_index = ds->pebs_buffer_base; 1984 1985 mask = (1ULL << x86_pmu.max_pebs_events) - 1; 1986 size = x86_pmu.max_pebs_events; 1987 if (x86_pmu.flags & PMU_FL_PEBS_ALL) { 1988 mask |= ((1ULL << x86_pmu.num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED; 1989 size = INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed; 1990 } 1991 1992 if (unlikely(base >= top)) { 1993 intel_pmu_pebs_event_update_no_drain(cpuc, size); 1994 return; 1995 } 1996 1997 for (at = base; at < top; at += x86_pmu.pebs_record_size) { 1998 struct pebs_record_nhm *p = at; 1999 u64 pebs_status; 2000 2001 pebs_status = p->status & cpuc->pebs_enabled; 2002 pebs_status &= mask; 2003 2004 /* PEBS v3 has more accurate status bits */ 2005 if (x86_pmu.intel_cap.pebs_format >= 3) { 2006 for_each_set_bit(bit, (unsigned long *)&pebs_status, size) 2007 counts[bit]++; 2008 2009 continue; 2010 } 2011 2012 /* 2013 * On some CPUs the PEBS status can be zero when PEBS is 2014 * racing with clearing of GLOBAL_STATUS. 2015 * 2016 * Normally we would drop that record, but in the 2017 * case when there is only a single active PEBS event 2018 * we can assume it's for that event. 2019 */ 2020 if (!pebs_status && cpuc->pebs_enabled && 2021 !(cpuc->pebs_enabled & (cpuc->pebs_enabled-1))) 2022 pebs_status = p->status = cpuc->pebs_enabled; 2023 2024 bit = find_first_bit((unsigned long *)&pebs_status, 2025 x86_pmu.max_pebs_events); 2026 if (bit >= x86_pmu.max_pebs_events) 2027 continue; 2028 2029 /* 2030 * The PEBS hardware does not deal well with the situation 2031 * when events happen near to each other and multiple bits 2032 * are set. But it should happen rarely. 2033 * 2034 * If these events include one PEBS and multiple non-PEBS 2035 * events, it doesn't impact PEBS record. The record will 2036 * be handled normally. (slow path) 2037 * 2038 * If these events include two or more PEBS events, the 2039 * records for the events can be collapsed into a single 2040 * one, and it's not possible to reconstruct all events 2041 * that caused the PEBS record. It's called collision. 2042 * If collision happened, the record will be dropped. 2043 */ 2044 if (pebs_status != (1ULL << bit)) { 2045 for_each_set_bit(i, (unsigned long *)&pebs_status, size) 2046 error[i]++; 2047 continue; 2048 } 2049 2050 counts[bit]++; 2051 } 2052 2053 for_each_set_bit(bit, (unsigned long *)&mask, size) { 2054 if ((counts[bit] == 0) && (error[bit] == 0)) 2055 continue; 2056 2057 event = cpuc->events[bit]; 2058 if (WARN_ON_ONCE(!event)) 2059 continue; 2060 2061 if (WARN_ON_ONCE(!event->attr.precise_ip)) 2062 continue; 2063 2064 /* log dropped samples number */ 2065 if (error[bit]) { 2066 perf_log_lost_samples(event, error[bit]); 2067 2068 if (iregs && perf_event_account_interrupt(event)) 2069 x86_pmu_stop(event, 0); 2070 } 2071 2072 if (counts[bit]) { 2073 __intel_pmu_pebs_event(event, iregs, data, base, 2074 top, bit, counts[bit], 2075 setup_pebs_fixed_sample_data); 2076 } 2077 } 2078 } 2079 2080 static void intel_pmu_drain_pebs_icl(struct pt_regs *iregs, struct perf_sample_data *data) 2081 { 2082 short counts[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; 2083 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 2084 int max_pebs_events = hybrid(cpuc->pmu, max_pebs_events); 2085 int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); 2086 struct debug_store *ds = cpuc->ds; 2087 struct perf_event *event; 2088 void *base, *at, *top; 2089 int bit, size; 2090 u64 mask; 2091 2092 if (!x86_pmu.pebs_active) 2093 return; 2094 2095 base = (struct pebs_basic *)(unsigned long)ds->pebs_buffer_base; 2096 top = (struct pebs_basic *)(unsigned long)ds->pebs_index; 2097 2098 ds->pebs_index = ds->pebs_buffer_base; 2099 2100 mask = ((1ULL << max_pebs_events) - 1) | 2101 (((1ULL << num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED); 2102 size = INTEL_PMC_IDX_FIXED + num_counters_fixed; 2103 2104 if (unlikely(base >= top)) { 2105 intel_pmu_pebs_event_update_no_drain(cpuc, size); 2106 return; 2107 } 2108 2109 for (at = base; at < top; at += cpuc->pebs_record_size) { 2110 u64 pebs_status; 2111 2112 pebs_status = get_pebs_status(at) & cpuc->pebs_enabled; 2113 pebs_status &= mask; 2114 2115 for_each_set_bit(bit, (unsigned long *)&pebs_status, size) 2116 counts[bit]++; 2117 } 2118 2119 for_each_set_bit(bit, (unsigned long *)&mask, size) { 2120 if (counts[bit] == 0) 2121 continue; 2122 2123 event = cpuc->events[bit]; 2124 if (WARN_ON_ONCE(!event)) 2125 continue; 2126 2127 if (WARN_ON_ONCE(!event->attr.precise_ip)) 2128 continue; 2129 2130 __intel_pmu_pebs_event(event, iregs, data, base, 2131 top, bit, counts[bit], 2132 setup_pebs_adaptive_sample_data); 2133 } 2134 } 2135 2136 /* 2137 * BTS, PEBS probe and setup 2138 */ 2139 2140 void __init intel_ds_init(void) 2141 { 2142 /* 2143 * No support for 32bit formats 2144 */ 2145 if (!boot_cpu_has(X86_FEATURE_DTES64)) 2146 return; 2147 2148 x86_pmu.bts = boot_cpu_has(X86_FEATURE_BTS); 2149 x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS); 2150 x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE; 2151 if (x86_pmu.version <= 4) 2152 x86_pmu.pebs_no_isolation = 1; 2153 2154 if (x86_pmu.pebs) { 2155 char pebs_type = x86_pmu.intel_cap.pebs_trap ? '+' : '-'; 2156 char *pebs_qual = ""; 2157 int format = x86_pmu.intel_cap.pebs_format; 2158 2159 if (format < 4) 2160 x86_pmu.intel_cap.pebs_baseline = 0; 2161 2162 switch (format) { 2163 case 0: 2164 pr_cont("PEBS fmt0%c, ", pebs_type); 2165 x86_pmu.pebs_record_size = sizeof(struct pebs_record_core); 2166 /* 2167 * Using >PAGE_SIZE buffers makes the WRMSR to 2168 * PERF_GLOBAL_CTRL in intel_pmu_enable_all() 2169 * mysteriously hang on Core2. 2170 * 2171 * As a workaround, we don't do this. 2172 */ 2173 x86_pmu.pebs_buffer_size = PAGE_SIZE; 2174 x86_pmu.drain_pebs = intel_pmu_drain_pebs_core; 2175 break; 2176 2177 case 1: 2178 pr_cont("PEBS fmt1%c, ", pebs_type); 2179 x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm); 2180 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 2181 break; 2182 2183 case 2: 2184 pr_cont("PEBS fmt2%c, ", pebs_type); 2185 x86_pmu.pebs_record_size = sizeof(struct pebs_record_hsw); 2186 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 2187 break; 2188 2189 case 3: 2190 pr_cont("PEBS fmt3%c, ", pebs_type); 2191 x86_pmu.pebs_record_size = 2192 sizeof(struct pebs_record_skl); 2193 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 2194 x86_pmu.large_pebs_flags |= PERF_SAMPLE_TIME; 2195 break; 2196 2197 case 4: 2198 x86_pmu.drain_pebs = intel_pmu_drain_pebs_icl; 2199 x86_pmu.pebs_record_size = sizeof(struct pebs_basic); 2200 if (x86_pmu.intel_cap.pebs_baseline) { 2201 x86_pmu.large_pebs_flags |= 2202 PERF_SAMPLE_BRANCH_STACK | 2203 PERF_SAMPLE_TIME; 2204 x86_pmu.flags |= PMU_FL_PEBS_ALL; 2205 pebs_qual = "-baseline"; 2206 x86_get_pmu(smp_processor_id())->capabilities |= PERF_PMU_CAP_EXTENDED_REGS; 2207 } else { 2208 /* Only basic record supported */ 2209 x86_pmu.large_pebs_flags &= 2210 ~(PERF_SAMPLE_ADDR | 2211 PERF_SAMPLE_TIME | 2212 PERF_SAMPLE_DATA_SRC | 2213 PERF_SAMPLE_TRANSACTION | 2214 PERF_SAMPLE_REGS_USER | 2215 PERF_SAMPLE_REGS_INTR); 2216 } 2217 pr_cont("PEBS fmt4%c%s, ", pebs_type, pebs_qual); 2218 2219 if (!is_hybrid() && x86_pmu.intel_cap.pebs_output_pt_available) { 2220 pr_cont("PEBS-via-PT, "); 2221 x86_get_pmu(smp_processor_id())->capabilities |= PERF_PMU_CAP_AUX_OUTPUT; 2222 } 2223 2224 break; 2225 2226 default: 2227 pr_cont("no PEBS fmt%d%c, ", format, pebs_type); 2228 x86_pmu.pebs = 0; 2229 } 2230 } 2231 } 2232 2233 void perf_restore_debug_store(void) 2234 { 2235 struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds); 2236 2237 if (!x86_pmu.bts && !x86_pmu.pebs) 2238 return; 2239 2240 wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds); 2241 } 2242