1 #include <linux/bitops.h> 2 #include <linux/types.h> 3 #include <linux/slab.h> 4 5 #include <asm/perf_event.h> 6 #include <asm/insn.h> 7 8 #include "../perf_event.h" 9 10 /* The size of a BTS record in bytes: */ 11 #define BTS_RECORD_SIZE 24 12 13 #define BTS_BUFFER_SIZE (PAGE_SIZE << 4) 14 #define PEBS_BUFFER_SIZE (PAGE_SIZE << 4) 15 #define PEBS_FIXUP_SIZE PAGE_SIZE 16 17 /* 18 * pebs_record_32 for p4 and core not supported 19 20 struct pebs_record_32 { 21 u32 flags, ip; 22 u32 ax, bc, cx, dx; 23 u32 si, di, bp, sp; 24 }; 25 26 */ 27 28 union intel_x86_pebs_dse { 29 u64 val; 30 struct { 31 unsigned int ld_dse:4; 32 unsigned int ld_stlb_miss:1; 33 unsigned int ld_locked:1; 34 unsigned int ld_reserved:26; 35 }; 36 struct { 37 unsigned int st_l1d_hit:1; 38 unsigned int st_reserved1:3; 39 unsigned int st_stlb_miss:1; 40 unsigned int st_locked:1; 41 unsigned int st_reserved2:26; 42 }; 43 }; 44 45 46 /* 47 * Map PEBS Load Latency Data Source encodings to generic 48 * memory data source information 49 */ 50 #define P(a, b) PERF_MEM_S(a, b) 51 #define OP_LH (P(OP, LOAD) | P(LVL, HIT)) 52 #define SNOOP_NONE_MISS (P(SNOOP, NONE) | P(SNOOP, MISS)) 53 54 /* Version for Sandy Bridge and later */ 55 static u64 pebs_data_source[] = { 56 P(OP, LOAD) | P(LVL, MISS) | P(LVL, L3) | P(SNOOP, NA),/* 0x00:ukn L3 */ 57 OP_LH | P(LVL, L1) | P(SNOOP, NONE), /* 0x01: L1 local */ 58 OP_LH | P(LVL, LFB) | P(SNOOP, NONE), /* 0x02: LFB hit */ 59 OP_LH | P(LVL, L2) | P(SNOOP, NONE), /* 0x03: L2 hit */ 60 OP_LH | P(LVL, L3) | P(SNOOP, NONE), /* 0x04: L3 hit */ 61 OP_LH | P(LVL, L3) | P(SNOOP, MISS), /* 0x05: L3 hit, snoop miss */ 62 OP_LH | P(LVL, L3) | P(SNOOP, HIT), /* 0x06: L3 hit, snoop hit */ 63 OP_LH | P(LVL, L3) | P(SNOOP, HITM), /* 0x07: L3 hit, snoop hitm */ 64 OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HIT), /* 0x08: L3 miss snoop hit */ 65 OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HITM), /* 0x09: L3 miss snoop hitm*/ 66 OP_LH | P(LVL, LOC_RAM) | P(SNOOP, HIT), /* 0x0a: L3 miss, shared */ 67 OP_LH | P(LVL, REM_RAM1) | P(SNOOP, HIT), /* 0x0b: L3 miss, shared */ 68 OP_LH | P(LVL, LOC_RAM) | SNOOP_NONE_MISS,/* 0x0c: L3 miss, excl */ 69 OP_LH | P(LVL, REM_RAM1) | SNOOP_NONE_MISS,/* 0x0d: L3 miss, excl */ 70 OP_LH | P(LVL, IO) | P(SNOOP, NONE), /* 0x0e: I/O */ 71 OP_LH | P(LVL, UNC) | P(SNOOP, NONE), /* 0x0f: uncached */ 72 }; 73 74 /* Patch up minor differences in the bits */ 75 void __init intel_pmu_pebs_data_source_nhm(void) 76 { 77 pebs_data_source[0x05] = OP_LH | P(LVL, L3) | P(SNOOP, HIT); 78 pebs_data_source[0x06] = OP_LH | P(LVL, L3) | P(SNOOP, HITM); 79 pebs_data_source[0x07] = OP_LH | P(LVL, L3) | P(SNOOP, HITM); 80 } 81 82 static u64 precise_store_data(u64 status) 83 { 84 union intel_x86_pebs_dse dse; 85 u64 val = P(OP, STORE) | P(SNOOP, NA) | P(LVL, L1) | P(TLB, L2); 86 87 dse.val = status; 88 89 /* 90 * bit 4: TLB access 91 * 1 = stored missed 2nd level TLB 92 * 93 * so it either hit the walker or the OS 94 * otherwise hit 2nd level TLB 95 */ 96 if (dse.st_stlb_miss) 97 val |= P(TLB, MISS); 98 else 99 val |= P(TLB, HIT); 100 101 /* 102 * bit 0: hit L1 data cache 103 * if not set, then all we know is that 104 * it missed L1D 105 */ 106 if (dse.st_l1d_hit) 107 val |= P(LVL, HIT); 108 else 109 val |= P(LVL, MISS); 110 111 /* 112 * bit 5: Locked prefix 113 */ 114 if (dse.st_locked) 115 val |= P(LOCK, LOCKED); 116 117 return val; 118 } 119 120 static u64 precise_datala_hsw(struct perf_event *event, u64 status) 121 { 122 union perf_mem_data_src dse; 123 124 dse.val = PERF_MEM_NA; 125 126 if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) 127 dse.mem_op = PERF_MEM_OP_STORE; 128 else if (event->hw.flags & PERF_X86_EVENT_PEBS_LD_HSW) 129 dse.mem_op = PERF_MEM_OP_LOAD; 130 131 /* 132 * L1 info only valid for following events: 133 * 134 * MEM_UOPS_RETIRED.STLB_MISS_STORES 135 * MEM_UOPS_RETIRED.LOCK_STORES 136 * MEM_UOPS_RETIRED.SPLIT_STORES 137 * MEM_UOPS_RETIRED.ALL_STORES 138 */ 139 if (event->hw.flags & PERF_X86_EVENT_PEBS_ST_HSW) { 140 if (status & 1) 141 dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_HIT; 142 else 143 dse.mem_lvl = PERF_MEM_LVL_L1 | PERF_MEM_LVL_MISS; 144 } 145 return dse.val; 146 } 147 148 static u64 load_latency_data(u64 status) 149 { 150 union intel_x86_pebs_dse dse; 151 u64 val; 152 int model = boot_cpu_data.x86_model; 153 int fam = boot_cpu_data.x86; 154 155 dse.val = status; 156 157 /* 158 * use the mapping table for bit 0-3 159 */ 160 val = pebs_data_source[dse.ld_dse]; 161 162 /* 163 * Nehalem models do not support TLB, Lock infos 164 */ 165 if (fam == 0x6 && (model == 26 || model == 30 166 || model == 31 || model == 46)) { 167 val |= P(TLB, NA) | P(LOCK, NA); 168 return val; 169 } 170 /* 171 * bit 4: TLB access 172 * 0 = did not miss 2nd level TLB 173 * 1 = missed 2nd level TLB 174 */ 175 if (dse.ld_stlb_miss) 176 val |= P(TLB, MISS) | P(TLB, L2); 177 else 178 val |= P(TLB, HIT) | P(TLB, L1) | P(TLB, L2); 179 180 /* 181 * bit 5: locked prefix 182 */ 183 if (dse.ld_locked) 184 val |= P(LOCK, LOCKED); 185 186 return val; 187 } 188 189 struct pebs_record_core { 190 u64 flags, ip; 191 u64 ax, bx, cx, dx; 192 u64 si, di, bp, sp; 193 u64 r8, r9, r10, r11; 194 u64 r12, r13, r14, r15; 195 }; 196 197 struct pebs_record_nhm { 198 u64 flags, ip; 199 u64 ax, bx, cx, dx; 200 u64 si, di, bp, sp; 201 u64 r8, r9, r10, r11; 202 u64 r12, r13, r14, r15; 203 u64 status, dla, dse, lat; 204 }; 205 206 /* 207 * Same as pebs_record_nhm, with two additional fields. 208 */ 209 struct pebs_record_hsw { 210 u64 flags, ip; 211 u64 ax, bx, cx, dx; 212 u64 si, di, bp, sp; 213 u64 r8, r9, r10, r11; 214 u64 r12, r13, r14, r15; 215 u64 status, dla, dse, lat; 216 u64 real_ip, tsx_tuning; 217 }; 218 219 union hsw_tsx_tuning { 220 struct { 221 u32 cycles_last_block : 32, 222 hle_abort : 1, 223 rtm_abort : 1, 224 instruction_abort : 1, 225 non_instruction_abort : 1, 226 retry : 1, 227 data_conflict : 1, 228 capacity_writes : 1, 229 capacity_reads : 1; 230 }; 231 u64 value; 232 }; 233 234 #define PEBS_HSW_TSX_FLAGS 0xff00000000ULL 235 236 /* Same as HSW, plus TSC */ 237 238 struct pebs_record_skl { 239 u64 flags, ip; 240 u64 ax, bx, cx, dx; 241 u64 si, di, bp, sp; 242 u64 r8, r9, r10, r11; 243 u64 r12, r13, r14, r15; 244 u64 status, dla, dse, lat; 245 u64 real_ip, tsx_tuning; 246 u64 tsc; 247 }; 248 249 void init_debug_store_on_cpu(int cpu) 250 { 251 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 252 253 if (!ds) 254 return; 255 256 wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 257 (u32)((u64)(unsigned long)ds), 258 (u32)((u64)(unsigned long)ds >> 32)); 259 } 260 261 void fini_debug_store_on_cpu(int cpu) 262 { 263 if (!per_cpu(cpu_hw_events, cpu).ds) 264 return; 265 266 wrmsr_on_cpu(cpu, MSR_IA32_DS_AREA, 0, 0); 267 } 268 269 static DEFINE_PER_CPU(void *, insn_buffer); 270 271 static int alloc_pebs_buffer(int cpu) 272 { 273 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 274 int node = cpu_to_node(cpu); 275 int max; 276 void *buffer, *ibuffer; 277 278 if (!x86_pmu.pebs) 279 return 0; 280 281 buffer = kzalloc_node(x86_pmu.pebs_buffer_size, GFP_KERNEL, node); 282 if (unlikely(!buffer)) 283 return -ENOMEM; 284 285 /* 286 * HSW+ already provides us the eventing ip; no need to allocate this 287 * buffer then. 288 */ 289 if (x86_pmu.intel_cap.pebs_format < 2) { 290 ibuffer = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node); 291 if (!ibuffer) { 292 kfree(buffer); 293 return -ENOMEM; 294 } 295 per_cpu(insn_buffer, cpu) = ibuffer; 296 } 297 298 max = x86_pmu.pebs_buffer_size / x86_pmu.pebs_record_size; 299 300 ds->pebs_buffer_base = (u64)(unsigned long)buffer; 301 ds->pebs_index = ds->pebs_buffer_base; 302 ds->pebs_absolute_maximum = ds->pebs_buffer_base + 303 max * x86_pmu.pebs_record_size; 304 305 return 0; 306 } 307 308 static void release_pebs_buffer(int cpu) 309 { 310 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 311 312 if (!ds || !x86_pmu.pebs) 313 return; 314 315 kfree(per_cpu(insn_buffer, cpu)); 316 per_cpu(insn_buffer, cpu) = NULL; 317 318 kfree((void *)(unsigned long)ds->pebs_buffer_base); 319 ds->pebs_buffer_base = 0; 320 } 321 322 static int alloc_bts_buffer(int cpu) 323 { 324 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 325 int node = cpu_to_node(cpu); 326 int max, thresh; 327 void *buffer; 328 329 if (!x86_pmu.bts) 330 return 0; 331 332 buffer = kzalloc_node(BTS_BUFFER_SIZE, GFP_KERNEL | __GFP_NOWARN, node); 333 if (unlikely(!buffer)) { 334 WARN_ONCE(1, "%s: BTS buffer allocation failure\n", __func__); 335 return -ENOMEM; 336 } 337 338 max = BTS_BUFFER_SIZE / BTS_RECORD_SIZE; 339 thresh = max / 16; 340 341 ds->bts_buffer_base = (u64)(unsigned long)buffer; 342 ds->bts_index = ds->bts_buffer_base; 343 ds->bts_absolute_maximum = ds->bts_buffer_base + 344 max * BTS_RECORD_SIZE; 345 ds->bts_interrupt_threshold = ds->bts_absolute_maximum - 346 thresh * BTS_RECORD_SIZE; 347 348 return 0; 349 } 350 351 static void release_bts_buffer(int cpu) 352 { 353 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 354 355 if (!ds || !x86_pmu.bts) 356 return; 357 358 kfree((void *)(unsigned long)ds->bts_buffer_base); 359 ds->bts_buffer_base = 0; 360 } 361 362 static int alloc_ds_buffer(int cpu) 363 { 364 int node = cpu_to_node(cpu); 365 struct debug_store *ds; 366 367 ds = kzalloc_node(sizeof(*ds), GFP_KERNEL, node); 368 if (unlikely(!ds)) 369 return -ENOMEM; 370 371 per_cpu(cpu_hw_events, cpu).ds = ds; 372 373 return 0; 374 } 375 376 static void release_ds_buffer(int cpu) 377 { 378 struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds; 379 380 if (!ds) 381 return; 382 383 per_cpu(cpu_hw_events, cpu).ds = NULL; 384 kfree(ds); 385 } 386 387 void release_ds_buffers(void) 388 { 389 int cpu; 390 391 if (!x86_pmu.bts && !x86_pmu.pebs) 392 return; 393 394 get_online_cpus(); 395 for_each_online_cpu(cpu) 396 fini_debug_store_on_cpu(cpu); 397 398 for_each_possible_cpu(cpu) { 399 release_pebs_buffer(cpu); 400 release_bts_buffer(cpu); 401 release_ds_buffer(cpu); 402 } 403 put_online_cpus(); 404 } 405 406 void reserve_ds_buffers(void) 407 { 408 int bts_err = 0, pebs_err = 0; 409 int cpu; 410 411 x86_pmu.bts_active = 0; 412 x86_pmu.pebs_active = 0; 413 414 if (!x86_pmu.bts && !x86_pmu.pebs) 415 return; 416 417 if (!x86_pmu.bts) 418 bts_err = 1; 419 420 if (!x86_pmu.pebs) 421 pebs_err = 1; 422 423 get_online_cpus(); 424 425 for_each_possible_cpu(cpu) { 426 if (alloc_ds_buffer(cpu)) { 427 bts_err = 1; 428 pebs_err = 1; 429 } 430 431 if (!bts_err && alloc_bts_buffer(cpu)) 432 bts_err = 1; 433 434 if (!pebs_err && alloc_pebs_buffer(cpu)) 435 pebs_err = 1; 436 437 if (bts_err && pebs_err) 438 break; 439 } 440 441 if (bts_err) { 442 for_each_possible_cpu(cpu) 443 release_bts_buffer(cpu); 444 } 445 446 if (pebs_err) { 447 for_each_possible_cpu(cpu) 448 release_pebs_buffer(cpu); 449 } 450 451 if (bts_err && pebs_err) { 452 for_each_possible_cpu(cpu) 453 release_ds_buffer(cpu); 454 } else { 455 if (x86_pmu.bts && !bts_err) 456 x86_pmu.bts_active = 1; 457 458 if (x86_pmu.pebs && !pebs_err) 459 x86_pmu.pebs_active = 1; 460 461 for_each_online_cpu(cpu) 462 init_debug_store_on_cpu(cpu); 463 } 464 465 put_online_cpus(); 466 } 467 468 /* 469 * BTS 470 */ 471 472 struct event_constraint bts_constraint = 473 EVENT_CONSTRAINT(0, 1ULL << INTEL_PMC_IDX_FIXED_BTS, 0); 474 475 void intel_pmu_enable_bts(u64 config) 476 { 477 unsigned long debugctlmsr; 478 479 debugctlmsr = get_debugctlmsr(); 480 481 debugctlmsr |= DEBUGCTLMSR_TR; 482 debugctlmsr |= DEBUGCTLMSR_BTS; 483 if (config & ARCH_PERFMON_EVENTSEL_INT) 484 debugctlmsr |= DEBUGCTLMSR_BTINT; 485 486 if (!(config & ARCH_PERFMON_EVENTSEL_OS)) 487 debugctlmsr |= DEBUGCTLMSR_BTS_OFF_OS; 488 489 if (!(config & ARCH_PERFMON_EVENTSEL_USR)) 490 debugctlmsr |= DEBUGCTLMSR_BTS_OFF_USR; 491 492 update_debugctlmsr(debugctlmsr); 493 } 494 495 void intel_pmu_disable_bts(void) 496 { 497 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 498 unsigned long debugctlmsr; 499 500 if (!cpuc->ds) 501 return; 502 503 debugctlmsr = get_debugctlmsr(); 504 505 debugctlmsr &= 506 ~(DEBUGCTLMSR_TR | DEBUGCTLMSR_BTS | DEBUGCTLMSR_BTINT | 507 DEBUGCTLMSR_BTS_OFF_OS | DEBUGCTLMSR_BTS_OFF_USR); 508 509 update_debugctlmsr(debugctlmsr); 510 } 511 512 int intel_pmu_drain_bts_buffer(void) 513 { 514 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 515 struct debug_store *ds = cpuc->ds; 516 struct bts_record { 517 u64 from; 518 u64 to; 519 u64 flags; 520 }; 521 struct perf_event *event = cpuc->events[INTEL_PMC_IDX_FIXED_BTS]; 522 struct bts_record *at, *base, *top; 523 struct perf_output_handle handle; 524 struct perf_event_header header; 525 struct perf_sample_data data; 526 unsigned long skip = 0; 527 struct pt_regs regs; 528 529 if (!event) 530 return 0; 531 532 if (!x86_pmu.bts_active) 533 return 0; 534 535 base = (struct bts_record *)(unsigned long)ds->bts_buffer_base; 536 top = (struct bts_record *)(unsigned long)ds->bts_index; 537 538 if (top <= base) 539 return 0; 540 541 memset(®s, 0, sizeof(regs)); 542 543 ds->bts_index = ds->bts_buffer_base; 544 545 perf_sample_data_init(&data, 0, event->hw.last_period); 546 547 /* 548 * BTS leaks kernel addresses in branches across the cpl boundary, 549 * such as traps or system calls, so unless the user is asking for 550 * kernel tracing (and right now it's not possible), we'd need to 551 * filter them out. But first we need to count how many of those we 552 * have in the current batch. This is an extra O(n) pass, however, 553 * it's much faster than the other one especially considering that 554 * n <= 2560 (BTS_BUFFER_SIZE / BTS_RECORD_SIZE * 15/16; see the 555 * alloc_bts_buffer()). 556 */ 557 for (at = base; at < top; at++) { 558 /* 559 * Note that right now *this* BTS code only works if 560 * attr::exclude_kernel is set, but let's keep this extra 561 * check here in case that changes. 562 */ 563 if (event->attr.exclude_kernel && 564 (kernel_ip(at->from) || kernel_ip(at->to))) 565 skip++; 566 } 567 568 /* 569 * Prepare a generic sample, i.e. fill in the invariant fields. 570 * We will overwrite the from and to address before we output 571 * the sample. 572 */ 573 rcu_read_lock(); 574 perf_prepare_sample(&header, &data, event, ®s); 575 576 if (perf_output_begin(&handle, event, header.size * 577 (top - base - skip))) 578 goto unlock; 579 580 for (at = base; at < top; at++) { 581 /* Filter out any records that contain kernel addresses. */ 582 if (event->attr.exclude_kernel && 583 (kernel_ip(at->from) || kernel_ip(at->to))) 584 continue; 585 586 data.ip = at->from; 587 data.addr = at->to; 588 589 perf_output_sample(&handle, &header, &data, event); 590 } 591 592 perf_output_end(&handle); 593 594 /* There's new data available. */ 595 event->hw.interrupts++; 596 event->pending_kill = POLL_IN; 597 unlock: 598 rcu_read_unlock(); 599 return 1; 600 } 601 602 static inline void intel_pmu_drain_pebs_buffer(void) 603 { 604 struct pt_regs regs; 605 606 x86_pmu.drain_pebs(®s); 607 } 608 609 void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in) 610 { 611 if (!sched_in) 612 intel_pmu_drain_pebs_buffer(); 613 } 614 615 /* 616 * PEBS 617 */ 618 struct event_constraint intel_core2_pebs_event_constraints[] = { 619 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */ 620 INTEL_FLAGS_UEVENT_CONSTRAINT(0xfec1, 0x1), /* X87_OPS_RETIRED.ANY */ 621 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* BR_INST_RETIRED.MISPRED */ 622 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1fc7, 0x1), /* SIMD_INST_RETURED.ANY */ 623 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */ 624 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 625 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01), 626 EVENT_CONSTRAINT_END 627 }; 628 629 struct event_constraint intel_atom_pebs_event_constraints[] = { 630 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */ 631 INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* MISPREDICTED_BRANCH_RETIRED */ 632 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1), /* MEM_LOAD_RETIRED.* */ 633 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 634 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01), 635 /* Allow all events as PEBS with no flags */ 636 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), 637 EVENT_CONSTRAINT_END 638 }; 639 640 struct event_constraint intel_slm_pebs_event_constraints[] = { 641 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 642 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x1), 643 /* Allow all events as PEBS with no flags */ 644 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), 645 EVENT_CONSTRAINT_END 646 }; 647 648 struct event_constraint intel_glm_pebs_event_constraints[] = { 649 /* Allow all events as PEBS with no flags */ 650 INTEL_ALL_EVENT_CONSTRAINT(0, 0x1), 651 EVENT_CONSTRAINT_END 652 }; 653 654 struct event_constraint intel_nehalem_pebs_event_constraints[] = { 655 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ 656 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ 657 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ 658 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INST_RETIRED.ANY */ 659 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ 660 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ 661 INTEL_FLAGS_UEVENT_CONSTRAINT(0x02c5, 0xf), /* BR_MISP_RETIRED.NEAR_CALL */ 662 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ 663 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ 664 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ 665 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ 666 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 667 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), 668 EVENT_CONSTRAINT_END 669 }; 670 671 struct event_constraint intel_westmere_pebs_event_constraints[] = { 672 INTEL_PLD_CONSTRAINT(0x100b, 0xf), /* MEM_INST_RETIRED.* */ 673 INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf), /* MEM_UNCORE_RETIRED.* */ 674 INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */ 675 INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf), /* INSTR_RETIRED.* */ 676 INTEL_EVENT_CONSTRAINT(0xc2, 0xf), /* UOPS_RETIRED.* */ 677 INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf), /* BR_INST_RETIRED.* */ 678 INTEL_FLAGS_EVENT_CONSTRAINT(0xc5, 0xf), /* BR_MISP_RETIRED.* */ 679 INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf), /* SSEX_UOPS_RETIRED.* */ 680 INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */ 681 INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf), /* MEM_LOAD_RETIRED.* */ 682 INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf), /* FP_ASSIST.* */ 683 /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */ 684 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), 685 EVENT_CONSTRAINT_END 686 }; 687 688 struct event_constraint intel_snb_pebs_event_constraints[] = { 689 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 690 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ 691 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ 692 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 693 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), 694 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ 695 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 696 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ 697 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ 698 /* Allow all events as PEBS with no flags */ 699 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 700 EVENT_CONSTRAINT_END 701 }; 702 703 struct event_constraint intel_ivb_pebs_event_constraints[] = { 704 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 705 INTEL_PLD_CONSTRAINT(0x01cd, 0x8), /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */ 706 INTEL_PST_CONSTRAINT(0x02cd, 0x8), /* MEM_TRANS_RETIRED.PRECISE_STORES */ 707 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 708 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), 709 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 710 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), 711 INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf), /* MEM_UOP_RETIRED.* */ 712 INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 713 INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */ 714 INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */ 715 /* Allow all events as PEBS with no flags */ 716 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 717 EVENT_CONSTRAINT_END 718 }; 719 720 struct event_constraint intel_hsw_pebs_event_constraints[] = { 721 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 722 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ 723 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 724 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), 725 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 726 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), 727 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ 728 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ 729 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ 730 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ 731 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ 732 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ 733 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ 734 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ 735 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 736 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ 737 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ 738 /* Allow all events as PEBS with no flags */ 739 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 740 EVENT_CONSTRAINT_END 741 }; 742 743 struct event_constraint intel_bdw_pebs_event_constraints[] = { 744 INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */ 745 INTEL_PLD_CONSTRAINT(0x01cd, 0xf), /* MEM_TRANS_RETIRED.* */ 746 /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ 747 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), 748 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 749 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), 750 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ 751 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */ 752 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */ 753 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */ 754 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */ 755 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */ 756 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */ 757 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */ 758 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */ 759 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */ 760 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */ 761 /* Allow all events as PEBS with no flags */ 762 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 763 EVENT_CONSTRAINT_END 764 }; 765 766 767 struct event_constraint intel_skl_pebs_event_constraints[] = { 768 INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2), /* INST_RETIRED.PREC_DIST */ 769 /* INST_RETIRED.PREC_DIST, inv=1, cmask=16 (cycles:ppp). */ 770 INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c0, 0x2), 771 /* INST_RETIRED.TOTAL_CYCLES_PS (inv=1, cmask=16) (cycles:p). */ 772 INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), 773 INTEL_PLD_CONSTRAINT(0x1cd, 0xf), /* MEM_TRANS_RETIRED.* */ 774 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */ 775 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */ 776 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_INST_RETIRED.LOCK_LOADS */ 777 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x22d0, 0xf), /* MEM_INST_RETIRED.LOCK_STORES */ 778 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_INST_RETIRED.SPLIT_LOADS */ 779 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_INST_RETIRED.SPLIT_STORES */ 780 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_INST_RETIRED.ALL_LOADS */ 781 INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_INST_RETIRED.ALL_STORES */ 782 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf), /* MEM_LOAD_RETIRED.* */ 783 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf), /* MEM_LOAD_L3_HIT_RETIRED.* */ 784 INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf), /* MEM_LOAD_L3_MISS_RETIRED.* */ 785 /* Allow all events as PEBS with no flags */ 786 INTEL_ALL_EVENT_CONSTRAINT(0, 0xf), 787 EVENT_CONSTRAINT_END 788 }; 789 790 struct event_constraint *intel_pebs_constraints(struct perf_event *event) 791 { 792 struct event_constraint *c; 793 794 if (!event->attr.precise_ip) 795 return NULL; 796 797 if (x86_pmu.pebs_constraints) { 798 for_each_event_constraint(c, x86_pmu.pebs_constraints) { 799 if ((event->hw.config & c->cmask) == c->code) { 800 event->hw.flags |= c->flags; 801 return c; 802 } 803 } 804 } 805 806 return &emptyconstraint; 807 } 808 809 /* 810 * We need the sched_task callback even for per-cpu events when we use 811 * the large interrupt threshold, such that we can provide PID and TID 812 * to PEBS samples. 813 */ 814 static inline bool pebs_needs_sched_cb(struct cpu_hw_events *cpuc) 815 { 816 return cpuc->n_pebs && (cpuc->n_pebs == cpuc->n_large_pebs); 817 } 818 819 static inline void pebs_update_threshold(struct cpu_hw_events *cpuc) 820 { 821 struct debug_store *ds = cpuc->ds; 822 u64 threshold; 823 824 if (cpuc->n_pebs == cpuc->n_large_pebs) { 825 threshold = ds->pebs_absolute_maximum - 826 x86_pmu.max_pebs_events * x86_pmu.pebs_record_size; 827 } else { 828 threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size; 829 } 830 831 ds->pebs_interrupt_threshold = threshold; 832 } 833 834 static void 835 pebs_update_state(bool needed_cb, struct cpu_hw_events *cpuc, struct pmu *pmu) 836 { 837 /* 838 * Make sure we get updated with the first PEBS 839 * event. It will trigger also during removal, but 840 * that does not hurt: 841 */ 842 bool update = cpuc->n_pebs == 1; 843 844 if (needed_cb != pebs_needs_sched_cb(cpuc)) { 845 if (!needed_cb) 846 perf_sched_cb_inc(pmu); 847 else 848 perf_sched_cb_dec(pmu); 849 850 update = true; 851 } 852 853 if (update) 854 pebs_update_threshold(cpuc); 855 } 856 857 void intel_pmu_pebs_add(struct perf_event *event) 858 { 859 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 860 struct hw_perf_event *hwc = &event->hw; 861 bool needed_cb = pebs_needs_sched_cb(cpuc); 862 863 cpuc->n_pebs++; 864 if (hwc->flags & PERF_X86_EVENT_FREERUNNING) 865 cpuc->n_large_pebs++; 866 867 pebs_update_state(needed_cb, cpuc, event->ctx->pmu); 868 } 869 870 void intel_pmu_pebs_enable(struct perf_event *event) 871 { 872 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 873 struct hw_perf_event *hwc = &event->hw; 874 struct debug_store *ds = cpuc->ds; 875 876 hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT; 877 878 cpuc->pebs_enabled |= 1ULL << hwc->idx; 879 880 if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) 881 cpuc->pebs_enabled |= 1ULL << (hwc->idx + 32); 882 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) 883 cpuc->pebs_enabled |= 1ULL << 63; 884 885 /* 886 * Use auto-reload if possible to save a MSR write in the PMI. 887 * This must be done in pmu::start(), because PERF_EVENT_IOC_PERIOD. 888 */ 889 if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) { 890 ds->pebs_event_reset[hwc->idx] = 891 (u64)(-hwc->sample_period) & x86_pmu.cntval_mask; 892 } 893 } 894 895 void intel_pmu_pebs_del(struct perf_event *event) 896 { 897 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 898 struct hw_perf_event *hwc = &event->hw; 899 bool needed_cb = pebs_needs_sched_cb(cpuc); 900 901 cpuc->n_pebs--; 902 if (hwc->flags & PERF_X86_EVENT_FREERUNNING) 903 cpuc->n_large_pebs--; 904 905 pebs_update_state(needed_cb, cpuc, event->ctx->pmu); 906 } 907 908 void intel_pmu_pebs_disable(struct perf_event *event) 909 { 910 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 911 struct hw_perf_event *hwc = &event->hw; 912 913 if (cpuc->n_pebs == cpuc->n_large_pebs) 914 intel_pmu_drain_pebs_buffer(); 915 916 cpuc->pebs_enabled &= ~(1ULL << hwc->idx); 917 918 if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT) 919 cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32)); 920 else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST) 921 cpuc->pebs_enabled &= ~(1ULL << 63); 922 923 if (cpuc->enabled) 924 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); 925 926 hwc->config |= ARCH_PERFMON_EVENTSEL_INT; 927 } 928 929 void intel_pmu_pebs_enable_all(void) 930 { 931 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 932 933 if (cpuc->pebs_enabled) 934 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); 935 } 936 937 void intel_pmu_pebs_disable_all(void) 938 { 939 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 940 941 if (cpuc->pebs_enabled) 942 wrmsrl(MSR_IA32_PEBS_ENABLE, 0); 943 } 944 945 static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs) 946 { 947 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 948 unsigned long from = cpuc->lbr_entries[0].from; 949 unsigned long old_to, to = cpuc->lbr_entries[0].to; 950 unsigned long ip = regs->ip; 951 int is_64bit = 0; 952 void *kaddr; 953 int size; 954 955 /* 956 * We don't need to fixup if the PEBS assist is fault like 957 */ 958 if (!x86_pmu.intel_cap.pebs_trap) 959 return 1; 960 961 /* 962 * No LBR entry, no basic block, no rewinding 963 */ 964 if (!cpuc->lbr_stack.nr || !from || !to) 965 return 0; 966 967 /* 968 * Basic blocks should never cross user/kernel boundaries 969 */ 970 if (kernel_ip(ip) != kernel_ip(to)) 971 return 0; 972 973 /* 974 * unsigned math, either ip is before the start (impossible) or 975 * the basic block is larger than 1 page (sanity) 976 */ 977 if ((ip - to) > PEBS_FIXUP_SIZE) 978 return 0; 979 980 /* 981 * We sampled a branch insn, rewind using the LBR stack 982 */ 983 if (ip == to) { 984 set_linear_ip(regs, from); 985 return 1; 986 } 987 988 size = ip - to; 989 if (!kernel_ip(ip)) { 990 int bytes; 991 u8 *buf = this_cpu_read(insn_buffer); 992 993 /* 'size' must fit our buffer, see above */ 994 bytes = copy_from_user_nmi(buf, (void __user *)to, size); 995 if (bytes != 0) 996 return 0; 997 998 kaddr = buf; 999 } else { 1000 kaddr = (void *)to; 1001 } 1002 1003 do { 1004 struct insn insn; 1005 1006 old_to = to; 1007 1008 #ifdef CONFIG_X86_64 1009 is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32); 1010 #endif 1011 insn_init(&insn, kaddr, size, is_64bit); 1012 insn_get_length(&insn); 1013 /* 1014 * Make sure there was not a problem decoding the 1015 * instruction and getting the length. This is 1016 * doubly important because we have an infinite 1017 * loop if insn.length=0. 1018 */ 1019 if (!insn.length) 1020 break; 1021 1022 to += insn.length; 1023 kaddr += insn.length; 1024 size -= insn.length; 1025 } while (to < ip); 1026 1027 if (to == ip) { 1028 set_linear_ip(regs, old_to); 1029 return 1; 1030 } 1031 1032 /* 1033 * Even though we decoded the basic block, the instruction stream 1034 * never matched the given IP, either the TO or the IP got corrupted. 1035 */ 1036 return 0; 1037 } 1038 1039 static inline u64 intel_hsw_weight(struct pebs_record_skl *pebs) 1040 { 1041 if (pebs->tsx_tuning) { 1042 union hsw_tsx_tuning tsx = { .value = pebs->tsx_tuning }; 1043 return tsx.cycles_last_block; 1044 } 1045 return 0; 1046 } 1047 1048 static inline u64 intel_hsw_transaction(struct pebs_record_skl *pebs) 1049 { 1050 u64 txn = (pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32; 1051 1052 /* For RTM XABORTs also log the abort code from AX */ 1053 if ((txn & PERF_TXN_TRANSACTION) && (pebs->ax & 1)) 1054 txn |= ((pebs->ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT; 1055 return txn; 1056 } 1057 1058 static void setup_pebs_sample_data(struct perf_event *event, 1059 struct pt_regs *iregs, void *__pebs, 1060 struct perf_sample_data *data, 1061 struct pt_regs *regs) 1062 { 1063 #define PERF_X86_EVENT_PEBS_HSW_PREC \ 1064 (PERF_X86_EVENT_PEBS_ST_HSW | \ 1065 PERF_X86_EVENT_PEBS_LD_HSW | \ 1066 PERF_X86_EVENT_PEBS_NA_HSW) 1067 /* 1068 * We cast to the biggest pebs_record but are careful not to 1069 * unconditionally access the 'extra' entries. 1070 */ 1071 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1072 struct pebs_record_skl *pebs = __pebs; 1073 u64 sample_type; 1074 int fll, fst, dsrc; 1075 int fl = event->hw.flags; 1076 1077 if (pebs == NULL) 1078 return; 1079 1080 sample_type = event->attr.sample_type; 1081 dsrc = sample_type & PERF_SAMPLE_DATA_SRC; 1082 1083 fll = fl & PERF_X86_EVENT_PEBS_LDLAT; 1084 fst = fl & (PERF_X86_EVENT_PEBS_ST | PERF_X86_EVENT_PEBS_HSW_PREC); 1085 1086 perf_sample_data_init(data, 0, event->hw.last_period); 1087 1088 data->period = event->hw.last_period; 1089 1090 /* 1091 * Use latency for weight (only avail with PEBS-LL) 1092 */ 1093 if (fll && (sample_type & PERF_SAMPLE_WEIGHT)) 1094 data->weight = pebs->lat; 1095 1096 /* 1097 * data.data_src encodes the data source 1098 */ 1099 if (dsrc) { 1100 u64 val = PERF_MEM_NA; 1101 if (fll) 1102 val = load_latency_data(pebs->dse); 1103 else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC)) 1104 val = precise_datala_hsw(event, pebs->dse); 1105 else if (fst) 1106 val = precise_store_data(pebs->dse); 1107 data->data_src.val = val; 1108 } 1109 1110 /* 1111 * We use the interrupt regs as a base because the PEBS record does not 1112 * contain a full regs set, specifically it seems to lack segment 1113 * descriptors, which get used by things like user_mode(). 1114 * 1115 * In the simple case fix up only the IP for PERF_SAMPLE_IP. 1116 * 1117 * We must however always use BP,SP from iregs for the unwinder to stay 1118 * sane; the record BP,SP can point into thin air when the record is 1119 * from a previous PMI context or an (I)RET happend between the record 1120 * and PMI. 1121 */ 1122 *regs = *iregs; 1123 regs->flags = pebs->flags; 1124 set_linear_ip(regs, pebs->ip); 1125 1126 if (sample_type & PERF_SAMPLE_REGS_INTR) { 1127 regs->ax = pebs->ax; 1128 regs->bx = pebs->bx; 1129 regs->cx = pebs->cx; 1130 regs->dx = pebs->dx; 1131 regs->si = pebs->si; 1132 regs->di = pebs->di; 1133 1134 /* 1135 * Per the above; only set BP,SP if we don't need callchains. 1136 * 1137 * XXX: does this make sense? 1138 */ 1139 if (!(sample_type & PERF_SAMPLE_CALLCHAIN)) { 1140 regs->bp = pebs->bp; 1141 regs->sp = pebs->sp; 1142 } 1143 1144 /* 1145 * Preserve PERF_EFLAGS_VM from set_linear_ip(). 1146 */ 1147 regs->flags = pebs->flags | (regs->flags & PERF_EFLAGS_VM); 1148 #ifndef CONFIG_X86_32 1149 regs->r8 = pebs->r8; 1150 regs->r9 = pebs->r9; 1151 regs->r10 = pebs->r10; 1152 regs->r11 = pebs->r11; 1153 regs->r12 = pebs->r12; 1154 regs->r13 = pebs->r13; 1155 regs->r14 = pebs->r14; 1156 regs->r15 = pebs->r15; 1157 #endif 1158 } 1159 1160 if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) { 1161 regs->ip = pebs->real_ip; 1162 regs->flags |= PERF_EFLAGS_EXACT; 1163 } else if (event->attr.precise_ip > 1 && intel_pmu_pebs_fixup_ip(regs)) 1164 regs->flags |= PERF_EFLAGS_EXACT; 1165 else 1166 regs->flags &= ~PERF_EFLAGS_EXACT; 1167 1168 if ((sample_type & PERF_SAMPLE_ADDR) && 1169 x86_pmu.intel_cap.pebs_format >= 1) 1170 data->addr = pebs->dla; 1171 1172 if (x86_pmu.intel_cap.pebs_format >= 2) { 1173 /* Only set the TSX weight when no memory weight. */ 1174 if ((sample_type & PERF_SAMPLE_WEIGHT) && !fll) 1175 data->weight = intel_hsw_weight(pebs); 1176 1177 if (sample_type & PERF_SAMPLE_TRANSACTION) 1178 data->txn = intel_hsw_transaction(pebs); 1179 } 1180 1181 /* 1182 * v3 supplies an accurate time stamp, so we use that 1183 * for the time stamp. 1184 * 1185 * We can only do this for the default trace clock. 1186 */ 1187 if (x86_pmu.intel_cap.pebs_format >= 3 && 1188 event->attr.use_clockid == 0) 1189 data->time = native_sched_clock_from_tsc(pebs->tsc); 1190 1191 if (has_branch_stack(event)) 1192 data->br_stack = &cpuc->lbr_stack; 1193 } 1194 1195 static inline void * 1196 get_next_pebs_record_by_bit(void *base, void *top, int bit) 1197 { 1198 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1199 void *at; 1200 u64 pebs_status; 1201 1202 /* 1203 * fmt0 does not have a status bitfield (does not use 1204 * perf_record_nhm format) 1205 */ 1206 if (x86_pmu.intel_cap.pebs_format < 1) 1207 return base; 1208 1209 if (base == NULL) 1210 return NULL; 1211 1212 for (at = base; at < top; at += x86_pmu.pebs_record_size) { 1213 struct pebs_record_nhm *p = at; 1214 1215 if (test_bit(bit, (unsigned long *)&p->status)) { 1216 /* PEBS v3 has accurate status bits */ 1217 if (x86_pmu.intel_cap.pebs_format >= 3) 1218 return at; 1219 1220 if (p->status == (1 << bit)) 1221 return at; 1222 1223 /* clear non-PEBS bit and re-check */ 1224 pebs_status = p->status & cpuc->pebs_enabled; 1225 pebs_status &= (1ULL << MAX_PEBS_EVENTS) - 1; 1226 if (pebs_status == (1 << bit)) 1227 return at; 1228 } 1229 } 1230 return NULL; 1231 } 1232 1233 static void __intel_pmu_pebs_event(struct perf_event *event, 1234 struct pt_regs *iregs, 1235 void *base, void *top, 1236 int bit, int count) 1237 { 1238 struct perf_sample_data data; 1239 struct pt_regs regs; 1240 void *at = get_next_pebs_record_by_bit(base, top, bit); 1241 1242 if (!intel_pmu_save_and_restart(event) && 1243 !(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)) 1244 return; 1245 1246 while (count > 1) { 1247 setup_pebs_sample_data(event, iregs, at, &data, ®s); 1248 perf_event_output(event, &data, ®s); 1249 at += x86_pmu.pebs_record_size; 1250 at = get_next_pebs_record_by_bit(at, top, bit); 1251 count--; 1252 } 1253 1254 setup_pebs_sample_data(event, iregs, at, &data, ®s); 1255 1256 /* 1257 * All but the last records are processed. 1258 * The last one is left to be able to call the overflow handler. 1259 */ 1260 if (perf_event_overflow(event, &data, ®s)) { 1261 x86_pmu_stop(event, 0); 1262 return; 1263 } 1264 1265 } 1266 1267 static void intel_pmu_drain_pebs_core(struct pt_regs *iregs) 1268 { 1269 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1270 struct debug_store *ds = cpuc->ds; 1271 struct perf_event *event = cpuc->events[0]; /* PMC0 only */ 1272 struct pebs_record_core *at, *top; 1273 int n; 1274 1275 if (!x86_pmu.pebs_active) 1276 return; 1277 1278 at = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base; 1279 top = (struct pebs_record_core *)(unsigned long)ds->pebs_index; 1280 1281 /* 1282 * Whatever else happens, drain the thing 1283 */ 1284 ds->pebs_index = ds->pebs_buffer_base; 1285 1286 if (!test_bit(0, cpuc->active_mask)) 1287 return; 1288 1289 WARN_ON_ONCE(!event); 1290 1291 if (!event->attr.precise_ip) 1292 return; 1293 1294 n = top - at; 1295 if (n <= 0) 1296 return; 1297 1298 __intel_pmu_pebs_event(event, iregs, at, top, 0, n); 1299 } 1300 1301 static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs) 1302 { 1303 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); 1304 struct debug_store *ds = cpuc->ds; 1305 struct perf_event *event; 1306 void *base, *at, *top; 1307 short counts[MAX_PEBS_EVENTS] = {}; 1308 short error[MAX_PEBS_EVENTS] = {}; 1309 int bit, i; 1310 1311 if (!x86_pmu.pebs_active) 1312 return; 1313 1314 base = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base; 1315 top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index; 1316 1317 ds->pebs_index = ds->pebs_buffer_base; 1318 1319 if (unlikely(base >= top)) 1320 return; 1321 1322 for (at = base; at < top; at += x86_pmu.pebs_record_size) { 1323 struct pebs_record_nhm *p = at; 1324 u64 pebs_status; 1325 1326 pebs_status = p->status & cpuc->pebs_enabled; 1327 pebs_status &= (1ULL << x86_pmu.max_pebs_events) - 1; 1328 1329 /* PEBS v3 has more accurate status bits */ 1330 if (x86_pmu.intel_cap.pebs_format >= 3) { 1331 for_each_set_bit(bit, (unsigned long *)&pebs_status, 1332 x86_pmu.max_pebs_events) 1333 counts[bit]++; 1334 1335 continue; 1336 } 1337 1338 /* 1339 * On some CPUs the PEBS status can be zero when PEBS is 1340 * racing with clearing of GLOBAL_STATUS. 1341 * 1342 * Normally we would drop that record, but in the 1343 * case when there is only a single active PEBS event 1344 * we can assume it's for that event. 1345 */ 1346 if (!pebs_status && cpuc->pebs_enabled && 1347 !(cpuc->pebs_enabled & (cpuc->pebs_enabled-1))) 1348 pebs_status = cpuc->pebs_enabled; 1349 1350 bit = find_first_bit((unsigned long *)&pebs_status, 1351 x86_pmu.max_pebs_events); 1352 if (bit >= x86_pmu.max_pebs_events) 1353 continue; 1354 1355 /* 1356 * The PEBS hardware does not deal well with the situation 1357 * when events happen near to each other and multiple bits 1358 * are set. But it should happen rarely. 1359 * 1360 * If these events include one PEBS and multiple non-PEBS 1361 * events, it doesn't impact PEBS record. The record will 1362 * be handled normally. (slow path) 1363 * 1364 * If these events include two or more PEBS events, the 1365 * records for the events can be collapsed into a single 1366 * one, and it's not possible to reconstruct all events 1367 * that caused the PEBS record. It's called collision. 1368 * If collision happened, the record will be dropped. 1369 */ 1370 if (p->status != (1ULL << bit)) { 1371 for_each_set_bit(i, (unsigned long *)&pebs_status, 1372 x86_pmu.max_pebs_events) 1373 error[i]++; 1374 continue; 1375 } 1376 1377 counts[bit]++; 1378 } 1379 1380 for (bit = 0; bit < x86_pmu.max_pebs_events; bit++) { 1381 if ((counts[bit] == 0) && (error[bit] == 0)) 1382 continue; 1383 1384 event = cpuc->events[bit]; 1385 if (WARN_ON_ONCE(!event)) 1386 continue; 1387 1388 if (WARN_ON_ONCE(!event->attr.precise_ip)) 1389 continue; 1390 1391 /* log dropped samples number */ 1392 if (error[bit]) 1393 perf_log_lost_samples(event, error[bit]); 1394 1395 if (counts[bit]) { 1396 __intel_pmu_pebs_event(event, iregs, base, 1397 top, bit, counts[bit]); 1398 } 1399 } 1400 } 1401 1402 /* 1403 * BTS, PEBS probe and setup 1404 */ 1405 1406 void __init intel_ds_init(void) 1407 { 1408 /* 1409 * No support for 32bit formats 1410 */ 1411 if (!boot_cpu_has(X86_FEATURE_DTES64)) 1412 return; 1413 1414 x86_pmu.bts = boot_cpu_has(X86_FEATURE_BTS); 1415 x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS); 1416 x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE; 1417 if (x86_pmu.pebs) { 1418 char pebs_type = x86_pmu.intel_cap.pebs_trap ? '+' : '-'; 1419 int format = x86_pmu.intel_cap.pebs_format; 1420 1421 switch (format) { 1422 case 0: 1423 pr_cont("PEBS fmt0%c, ", pebs_type); 1424 x86_pmu.pebs_record_size = sizeof(struct pebs_record_core); 1425 /* 1426 * Using >PAGE_SIZE buffers makes the WRMSR to 1427 * PERF_GLOBAL_CTRL in intel_pmu_enable_all() 1428 * mysteriously hang on Core2. 1429 * 1430 * As a workaround, we don't do this. 1431 */ 1432 x86_pmu.pebs_buffer_size = PAGE_SIZE; 1433 x86_pmu.drain_pebs = intel_pmu_drain_pebs_core; 1434 break; 1435 1436 case 1: 1437 pr_cont("PEBS fmt1%c, ", pebs_type); 1438 x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm); 1439 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 1440 break; 1441 1442 case 2: 1443 pr_cont("PEBS fmt2%c, ", pebs_type); 1444 x86_pmu.pebs_record_size = sizeof(struct pebs_record_hsw); 1445 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 1446 break; 1447 1448 case 3: 1449 pr_cont("PEBS fmt3%c, ", pebs_type); 1450 x86_pmu.pebs_record_size = 1451 sizeof(struct pebs_record_skl); 1452 x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm; 1453 x86_pmu.free_running_flags |= PERF_SAMPLE_TIME; 1454 break; 1455 1456 default: 1457 pr_cont("no PEBS fmt%d%c, ", format, pebs_type); 1458 x86_pmu.pebs = 0; 1459 } 1460 } 1461 } 1462 1463 void perf_restore_debug_store(void) 1464 { 1465 struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds); 1466 1467 if (!x86_pmu.bts && !x86_pmu.pebs) 1468 return; 1469 1470 wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds); 1471 } 1472