kernel/arch/x86/kernel/cpu/perf_event_intel_ds.c

   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(&regs, 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         perf_prepare_sample(&header, &data, event, &regs);
 574
 575         if (perf_output_begin(&handle, event, header.size *
 576                               (top - base - skip)))
 577                 return 1;
 578
 579         for (at = base; at < top; at++) {
 580                 /* Filter out any records that contain kernel addresses. */
 581                 if (event->attr.exclude_kernel &&
 582                     (kernel_ip(at->from) || kernel_ip(at->to)))
 583                         continue;
 584
 585                 data.ip         = at->from;
 586                 data.addr       = at->to;
 587
 588                 perf_output_sample(&handle, &header, &data, event);
 589         }
 590
 591         perf_output_end(&handle);
 592
 593         /* There's new data available. */
 594         event->hw.interrupts++;
 595         event->pending_kill = POLL_IN;
 596         return 1;
 597 }
 598
 599 static inline void intel_pmu_drain_pebs_buffer(void)
 600 {
 601         struct pt_regs regs;
 602
 603         x86_pmu.drain_pebs(&regs);
 604 }
 605
 606 void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in)
 607 {
 608         if (!sched_in)
 609                 intel_pmu_drain_pebs_buffer();
 610 }
 611
 612 /*
 613  * PEBS
 614  */
 615 struct event_constraint intel_core2_pebs_event_constraints[] = {
 616         INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */
 617         INTEL_FLAGS_UEVENT_CONSTRAINT(0xfec1, 0x1), /* X87_OPS_RETIRED.ANY */
 618         INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* BR_INST_RETIRED.MISPRED */
 619         INTEL_FLAGS_UEVENT_CONSTRAINT(0x1fc7, 0x1), /* SIMD_INST_RETURED.ANY */
 620         INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1),    /* MEM_LOAD_RETIRED.* */
 621         /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
 622         INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01),
 623         EVENT_CONSTRAINT_END
 624 };
 625
 626 struct event_constraint intel_atom_pebs_event_constraints[] = {
 627         INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c0, 0x1), /* INST_RETIRED.ANY */
 628         INTEL_FLAGS_UEVENT_CONSTRAINT(0x00c5, 0x1), /* MISPREDICTED_BRANCH_RETIRED */
 629         INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0x1),    /* MEM_LOAD_RETIRED.* */
 630         /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
 631         INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x01),
 632         EVENT_CONSTRAINT_END
 633 };
 634
 635 struct event_constraint intel_slm_pebs_event_constraints[] = {
 636         /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
 637         INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x1),
 638         /* Allow all events as PEBS with no flags */
 639         INTEL_ALL_EVENT_CONSTRAINT(0, 0x1),
 640         EVENT_CONSTRAINT_END
 641 };
 642
 643 struct event_constraint intel_nehalem_pebs_event_constraints[] = {
 644         INTEL_PLD_CONSTRAINT(0x100b, 0xf),      /* MEM_INST_RETIRED.* */
 645         INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf),    /* MEM_UNCORE_RETIRED.* */
 646         INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */
 647         INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf),    /* INST_RETIRED.ANY */
 648         INTEL_EVENT_CONSTRAINT(0xc2, 0xf),    /* UOPS_RETIRED.* */
 649         INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf),    /* BR_INST_RETIRED.* */
 650         INTEL_FLAGS_UEVENT_CONSTRAINT(0x02c5, 0xf), /* BR_MISP_RETIRED.NEAR_CALL */
 651         INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf),    /* SSEX_UOPS_RETIRED.* */
 652         INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */
 653         INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf),    /* MEM_LOAD_RETIRED.* */
 654         INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf),    /* FP_ASSIST.* */
 655         /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
 656         INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f),
 657         EVENT_CONSTRAINT_END
 658 };
 659
 660 struct event_constraint intel_westmere_pebs_event_constraints[] = {
 661         INTEL_PLD_CONSTRAINT(0x100b, 0xf),      /* MEM_INST_RETIRED.* */
 662         INTEL_FLAGS_EVENT_CONSTRAINT(0x0f, 0xf),    /* MEM_UNCORE_RETIRED.* */
 663         INTEL_FLAGS_UEVENT_CONSTRAINT(0x010c, 0xf), /* MEM_STORE_RETIRED.DTLB_MISS */
 664         INTEL_FLAGS_EVENT_CONSTRAINT(0xc0, 0xf),    /* INSTR_RETIRED.* */
 665         INTEL_EVENT_CONSTRAINT(0xc2, 0xf),    /* UOPS_RETIRED.* */
 666         INTEL_FLAGS_EVENT_CONSTRAINT(0xc4, 0xf),    /* BR_INST_RETIRED.* */
 667         INTEL_FLAGS_EVENT_CONSTRAINT(0xc5, 0xf),    /* BR_MISP_RETIRED.* */
 668         INTEL_FLAGS_EVENT_CONSTRAINT(0xc7, 0xf),    /* SSEX_UOPS_RETIRED.* */
 669         INTEL_FLAGS_UEVENT_CONSTRAINT(0x20c8, 0xf), /* ITLB_MISS_RETIRED */
 670         INTEL_FLAGS_EVENT_CONSTRAINT(0xcb, 0xf),    /* MEM_LOAD_RETIRED.* */
 671         INTEL_FLAGS_EVENT_CONSTRAINT(0xf7, 0xf),    /* FP_ASSIST.* */
 672         /* INST_RETIRED.ANY_P, inv=1, cmask=16 (cycles:p). */
 673         INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f),
 674         EVENT_CONSTRAINT_END
 675 };
 676
 677 struct event_constraint intel_snb_pebs_event_constraints[] = {
 678         INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
 679         INTEL_PLD_CONSTRAINT(0x01cd, 0x8),    /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */
 680         INTEL_PST_CONSTRAINT(0x02cd, 0x8),    /* MEM_TRANS_RETIRED.PRECISE_STORES */
 681         /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
 682         INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
 683         INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf),    /* MEM_UOP_RETIRED.* */
 684         INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf),    /* MEM_LOAD_UOPS_RETIRED.* */
 685         INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf),    /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
 686         INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf),    /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
 687         /* Allow all events as PEBS with no flags */
 688         INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
 689         EVENT_CONSTRAINT_END
 690 };
 691
 692 struct event_constraint intel_ivb_pebs_event_constraints[] = {
 693         INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
 694         INTEL_PLD_CONSTRAINT(0x01cd, 0x8),    /* MEM_TRANS_RETIRED.LAT_ABOVE_THR */
 695         INTEL_PST_CONSTRAINT(0x02cd, 0x8),    /* MEM_TRANS_RETIRED.PRECISE_STORES */
 696         /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
 697         INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
 698         INTEL_EXCLEVT_CONSTRAINT(0xd0, 0xf),    /* MEM_UOP_RETIRED.* */
 699         INTEL_EXCLEVT_CONSTRAINT(0xd1, 0xf),    /* MEM_LOAD_UOPS_RETIRED.* */
 700         INTEL_EXCLEVT_CONSTRAINT(0xd2, 0xf),    /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
 701         INTEL_EXCLEVT_CONSTRAINT(0xd3, 0xf),    /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
 702         /* Allow all events as PEBS with no flags */
 703         INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
 704         EVENT_CONSTRAINT_END
 705 };
 706
 707 struct event_constraint intel_hsw_pebs_event_constraints[] = {
 708         INTEL_FLAGS_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */
 709         INTEL_PLD_CONSTRAINT(0x01cd, 0xf),    /* MEM_TRANS_RETIRED.* */
 710         /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
 711         INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
 712         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */
 713         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x11d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_LOADS */
 714         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x21d0, 0xf), /* MEM_UOPS_RETIRED.LOCK_LOADS */
 715         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x41d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_LOADS */
 716         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XLD(0x81d0, 0xf), /* MEM_UOPS_RETIRED.ALL_LOADS */
 717         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x12d0, 0xf), /* MEM_UOPS_RETIRED.STLB_MISS_STORES */
 718         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x42d0, 0xf), /* MEM_UOPS_RETIRED.SPLIT_STORES */
 719         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_XST(0x82d0, 0xf), /* MEM_UOPS_RETIRED.ALL_STORES */
 720         INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd1, 0xf),    /* MEM_LOAD_UOPS_RETIRED.* */
 721         INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd2, 0xf),    /* MEM_LOAD_UOPS_L3_HIT_RETIRED.* */
 722         INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_XLD(0xd3, 0xf),    /* MEM_LOAD_UOPS_L3_MISS_RETIRED.* */
 723         /* Allow all events as PEBS with no flags */
 724         INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
 725         EVENT_CONSTRAINT_END
 726 };
 727
 728 struct event_constraint intel_skl_pebs_event_constraints[] = {
 729         INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2),      /* INST_RETIRED.PREC_DIST */
 730         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */
 731         /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
 732         INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
 733         INTEL_PLD_CONSTRAINT(0x1cd, 0xf),                     /* MEM_TRANS_RETIRED.* */
 734         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */
 735         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */
 736         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x21d0, 0xf), /* MEM_INST_RETIRED.LOCK_LOADS */
 737         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x22d0, 0xf), /* MEM_INST_RETIRED.LOCK_STORES */
 738         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x41d0, 0xf), /* MEM_INST_RETIRED.SPLIT_LOADS */
 739         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x42d0, 0xf), /* MEM_INST_RETIRED.SPLIT_STORES */
 740         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x81d0, 0xf), /* MEM_INST_RETIRED.ALL_LOADS */
 741         INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x82d0, 0xf), /* MEM_INST_RETIRED.ALL_STORES */
 742         INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd1, 0xf),    /* MEM_LOAD_RETIRED.* */
 743         INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd2, 0xf),    /* MEM_LOAD_L3_HIT_RETIRED.* */
 744         INTEL_FLAGS_EVENT_CONSTRAINT_DATALA_LD(0xd3, 0xf),    /* MEM_LOAD_L3_MISS_RETIRED.* */
 745         /* Allow all events as PEBS with no flags */
 746         INTEL_ALL_EVENT_CONSTRAINT(0, 0xf),
 747         EVENT_CONSTRAINT_END
 748 };
 749
 750 struct event_constraint *intel_pebs_constraints(struct perf_event *event)
 751 {
 752         struct event_constraint *c;
 753
 754         if (!event->attr.precise_ip)
 755                 return NULL;
 756
 757         if (x86_pmu.pebs_constraints) {
 758                 for_each_event_constraint(c, x86_pmu.pebs_constraints) {
 759                         if ((event->hw.config & c->cmask) == c->code) {
 760                                 event->hw.flags |= c->flags;
 761                                 return c;
 762                         }
 763                 }
 764         }
 765
 766         return &emptyconstraint;
 767 }
 768
 769 static inline bool pebs_is_enabled(struct cpu_hw_events *cpuc)
 770 {
 771         return (cpuc->pebs_enabled & ((1ULL << MAX_PEBS_EVENTS) - 1));
 772 }
 773
 774 void intel_pmu_pebs_enable(struct perf_event *event)
 775 {
 776         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 777         struct hw_perf_event *hwc = &event->hw;
 778         struct debug_store *ds = cpuc->ds;
 779         bool first_pebs;
 780         u64 threshold;
 781
 782         hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT;
 783
 784         first_pebs = !pebs_is_enabled(cpuc);
 785         cpuc->pebs_enabled |= 1ULL << hwc->idx;
 786
 787         if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT)
 788                 cpuc->pebs_enabled |= 1ULL << (hwc->idx + 32);
 789         else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST)
 790                 cpuc->pebs_enabled |= 1ULL << 63;
 791
 792         /*
 793          * When the event is constrained enough we can use a larger
 794          * threshold and run the event with less frequent PMI.
 795          */
 796         if (hwc->flags & PERF_X86_EVENT_FREERUNNING) {
 797                 threshold = ds->pebs_absolute_maximum -
 798                         x86_pmu.max_pebs_events * x86_pmu.pebs_record_size;
 799
 800                 if (first_pebs)
 801                         perf_sched_cb_inc(event->ctx->pmu);
 802         } else {
 803                 threshold = ds->pebs_buffer_base + x86_pmu.pebs_record_size;
 804
 805                 /*
 806                  * If not all events can use larger buffer,
 807                  * roll back to threshold = 1
 808                  */
 809                 if (!first_pebs &&
 810                     (ds->pebs_interrupt_threshold > threshold))
 811                         perf_sched_cb_dec(event->ctx->pmu);
 812         }
 813
 814         /* Use auto-reload if possible to save a MSR write in the PMI */
 815         if (hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) {
 816                 ds->pebs_event_reset[hwc->idx] =
 817                         (u64)(-hwc->sample_period) & x86_pmu.cntval_mask;
 818         }
 819
 820         if (first_pebs || ds->pebs_interrupt_threshold > threshold)
 821                 ds->pebs_interrupt_threshold = threshold;
 822 }
 823
 824 void intel_pmu_pebs_disable(struct perf_event *event)
 825 {
 826         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 827         struct hw_perf_event *hwc = &event->hw;
 828         struct debug_store *ds = cpuc->ds;
 829         bool large_pebs = ds->pebs_interrupt_threshold >
 830                 ds->pebs_buffer_base + x86_pmu.pebs_record_size;
 831
 832         if (large_pebs)
 833                 intel_pmu_drain_pebs_buffer();
 834
 835         cpuc->pebs_enabled &= ~(1ULL << hwc->idx);
 836
 837         if (event->hw.flags & PERF_X86_EVENT_PEBS_LDLAT)
 838                 cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32));
 839         else if (event->hw.flags & PERF_X86_EVENT_PEBS_ST)
 840                 cpuc->pebs_enabled &= ~(1ULL << 63);
 841
 842         if (large_pebs && !pebs_is_enabled(cpuc))
 843                 perf_sched_cb_dec(event->ctx->pmu);
 844
 845         if (cpuc->enabled)
 846                 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled);
 847
 848         hwc->config |= ARCH_PERFMON_EVENTSEL_INT;
 849 }
 850
 851 void intel_pmu_pebs_enable_all(void)
 852 {
 853         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 854
 855         if (cpuc->pebs_enabled)
 856                 wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled);
 857 }
 858
 859 void intel_pmu_pebs_disable_all(void)
 860 {
 861         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 862
 863         if (cpuc->pebs_enabled)
 864                 wrmsrl(MSR_IA32_PEBS_ENABLE, 0);
 865 }
 866
 867 static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
 868 {
 869         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 870         unsigned long from = cpuc->lbr_entries[0].from;
 871         unsigned long old_to, to = cpuc->lbr_entries[0].to;
 872         unsigned long ip = regs->ip;
 873         int is_64bit = 0;
 874         void *kaddr;
 875         int size;
 876
 877         /*
 878          * We don't need to fixup if the PEBS assist is fault like
 879          */
 880         if (!x86_pmu.intel_cap.pebs_trap)
 881                 return 1;
 882
 883         /*
 884          * No LBR entry, no basic block, no rewinding
 885          */
 886         if (!cpuc->lbr_stack.nr || !from || !to)
 887                 return 0;
 888
 889         /*
 890          * Basic blocks should never cross user/kernel boundaries
 891          */
 892         if (kernel_ip(ip) != kernel_ip(to))
 893                 return 0;
 894
 895         /*
 896          * unsigned math, either ip is before the start (impossible) or
 897          * the basic block is larger than 1 page (sanity)
 898          */
 899         if ((ip - to) > PEBS_FIXUP_SIZE)
 900                 return 0;
 901
 902         /*
 903          * We sampled a branch insn, rewind using the LBR stack
 904          */
 905         if (ip == to) {
 906                 set_linear_ip(regs, from);
 907                 return 1;
 908         }
 909
 910         size = ip - to;
 911         if (!kernel_ip(ip)) {
 912                 int bytes;
 913                 u8 *buf = this_cpu_read(insn_buffer);
 914
 915                 /* 'size' must fit our buffer, see above */
 916                 bytes = copy_from_user_nmi(buf, (void __user *)to, size);
 917                 if (bytes != 0)
 918                         return 0;
 919
 920                 kaddr = buf;
 921         } else {
 922                 kaddr = (void *)to;
 923         }
 924
 925         do {
 926                 struct insn insn;
 927
 928                 old_to = to;
 929
 930 #ifdef CONFIG_X86_64
 931                 is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32);
 932 #endif
 933                 insn_init(&insn, kaddr, size, is_64bit);
 934                 insn_get_length(&insn);
 935                 /*
 936                  * Make sure there was not a problem decoding the
 937                  * instruction and getting the length.  This is
 938                  * doubly important because we have an infinite
 939                  * loop if insn.length=0.
 940                  */
 941                 if (!insn.length)
 942                         break;
 943
 944                 to += insn.length;
 945                 kaddr += insn.length;
 946                 size -= insn.length;
 947         } while (to < ip);
 948
 949         if (to == ip) {
 950                 set_linear_ip(regs, old_to);
 951                 return 1;
 952         }
 953
 954         /*
 955          * Even though we decoded the basic block, the instruction stream
 956          * never matched the given IP, either the TO or the IP got corrupted.
 957          */
 958         return 0;
 959 }
 960
 961 static inline u64 intel_hsw_weight(struct pebs_record_skl *pebs)
 962 {
 963         if (pebs->tsx_tuning) {
 964                 union hsw_tsx_tuning tsx = { .value = pebs->tsx_tuning };
 965                 return tsx.cycles_last_block;
 966         }
 967         return 0;
 968 }
 969
 970 static inline u64 intel_hsw_transaction(struct pebs_record_skl *pebs)
 971 {
 972         u64 txn = (pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32;
 973
 974         /* For RTM XABORTs also log the abort code from AX */
 975         if ((txn & PERF_TXN_TRANSACTION) && (pebs->ax & 1))
 976                 txn |= ((pebs->ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT;
 977         return txn;
 978 }
 979
 980 static void setup_pebs_sample_data(struct perf_event *event,
 981                                    struct pt_regs *iregs, void *__pebs,
 982                                    struct perf_sample_data *data,
 983                                    struct pt_regs *regs)
 984 {
 985 #define PERF_X86_EVENT_PEBS_HSW_PREC \
 986                 (PERF_X86_EVENT_PEBS_ST_HSW | \
 987                  PERF_X86_EVENT_PEBS_LD_HSW | \
 988                  PERF_X86_EVENT_PEBS_NA_HSW)
 989         /*
 990          * We cast to the biggest pebs_record but are careful not to
 991          * unconditionally access the 'extra' entries.
 992          */
 993         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 994         struct pebs_record_skl *pebs = __pebs;
 995         u64 sample_type;
 996         int fll, fst, dsrc;
 997         int fl = event->hw.flags;
 998
 999         if (pebs == NULL)
1000                 return;
1001
1002         sample_type = event->attr.sample_type;
1003         dsrc = sample_type & PERF_SAMPLE_DATA_SRC;
1004
1005         fll = fl & PERF_X86_EVENT_PEBS_LDLAT;
1006         fst = fl & (PERF_X86_EVENT_PEBS_ST | PERF_X86_EVENT_PEBS_HSW_PREC);
1007
1008         perf_sample_data_init(data, 0, event->hw.last_period);
1009
1010         data->period = event->hw.last_period;
1011
1012         /*
1013          * Use latency for weight (only avail with PEBS-LL)
1014          */
1015         if (fll && (sample_type & PERF_SAMPLE_WEIGHT))
1016                 data->weight = pebs->lat;
1017
1018         /*
1019          * data.data_src encodes the data source
1020          */
1021         if (dsrc) {
1022                 u64 val = PERF_MEM_NA;
1023                 if (fll)
1024                         val = load_latency_data(pebs->dse);
1025                 else if (fst && (fl & PERF_X86_EVENT_PEBS_HSW_PREC))
1026                         val = precise_datala_hsw(event, pebs->dse);
1027                 else if (fst)
1028                         val = precise_store_data(pebs->dse);
1029                 data->data_src.val = val;
1030         }
1031
1032         /*
1033          * We use the interrupt regs as a base because the PEBS record
1034          * does not contain a full regs set, specifically it seems to
1035          * lack segment descriptors, which get used by things like
1036          * user_mode().
1037          *
1038          * In the simple case fix up only the IP and BP,SP regs, for
1039          * PERF_SAMPLE_IP and PERF_SAMPLE_CALLCHAIN to function properly.
1040          * A possible PERF_SAMPLE_REGS will have to transfer all regs.
1041          */
1042         *regs = *iregs;
1043         regs->flags = pebs->flags;
1044         set_linear_ip(regs, pebs->ip);
1045         regs->bp = pebs->bp;
1046         regs->sp = pebs->sp;
1047
1048         if (sample_type & PERF_SAMPLE_REGS_INTR) {
1049                 regs->ax = pebs->ax;
1050                 regs->bx = pebs->bx;
1051                 regs->cx = pebs->cx;
1052                 regs->dx = pebs->dx;
1053                 regs->si = pebs->si;
1054                 regs->di = pebs->di;
1055                 regs->bp = pebs->bp;
1056                 regs->sp = pebs->sp;
1057
1058                 regs->flags = pebs->flags;
1059 #ifndef CONFIG_X86_32
1060                 regs->r8 = pebs->r8;
1061                 regs->r9 = pebs->r9;
1062                 regs->r10 = pebs->r10;
1063                 regs->r11 = pebs->r11;
1064                 regs->r12 = pebs->r12;
1065                 regs->r13 = pebs->r13;
1066                 regs->r14 = pebs->r14;
1067                 regs->r15 = pebs->r15;
1068 #endif
1069         }
1070
1071         if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) {
1072                 regs->ip = pebs->real_ip;
1073                 regs->flags |= PERF_EFLAGS_EXACT;
1074         } else if (event->attr.precise_ip > 1 && intel_pmu_pebs_fixup_ip(regs))
1075                 regs->flags |= PERF_EFLAGS_EXACT;
1076         else
1077                 regs->flags &= ~PERF_EFLAGS_EXACT;
1078
1079         if ((sample_type & PERF_SAMPLE_ADDR) &&
1080             x86_pmu.intel_cap.pebs_format >= 1)
1081                 data->addr = pebs->dla;
1082
1083         if (x86_pmu.intel_cap.pebs_format >= 2) {
1084                 /* Only set the TSX weight when no memory weight. */
1085                 if ((sample_type & PERF_SAMPLE_WEIGHT) && !fll)
1086                         data->weight = intel_hsw_weight(pebs);
1087
1088                 if (sample_type & PERF_SAMPLE_TRANSACTION)
1089                         data->txn = intel_hsw_transaction(pebs);
1090         }
1091
1092         /*
1093          * v3 supplies an accurate time stamp, so we use that
1094          * for the time stamp.
1095          *
1096          * We can only do this for the default trace clock.
1097          */
1098         if (x86_pmu.intel_cap.pebs_format >= 3 &&
1099                 event->attr.use_clockid == 0)
1100                 data->time = native_sched_clock_from_tsc(pebs->tsc);
1101
1102         if (has_branch_stack(event))
1103                 data->br_stack = &cpuc->lbr_stack;
1104 }
1105
1106 static inline void *
1107 get_next_pebs_record_by_bit(void *base, void *top, int bit)
1108 {
1109         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1110         void *at;
1111         u64 pebs_status;
1112
1113         /*
1114          * fmt0 does not have a status bitfield (does not use
1115          * perf_record_nhm format)
1116          */
1117         if (x86_pmu.intel_cap.pebs_format < 1)
1118                 return base;
1119
1120         if (base == NULL)
1121                 return NULL;
1122
1123         for (at = base; at < top; at += x86_pmu.pebs_record_size) {
1124                 struct pebs_record_nhm *p = at;
1125
1126                 if (test_bit(bit, (unsigned long *)&p->status)) {
1127                         /* PEBS v3 has accurate status bits */
1128                         if (x86_pmu.intel_cap.pebs_format >= 3)
1129                                 return at;
1130
1131                         if (p->status == (1 << bit))
1132                                 return at;
1133
1134                         /* clear non-PEBS bit and re-check */
1135                         pebs_status = p->status & cpuc->pebs_enabled;
1136                         pebs_status &= (1ULL << MAX_PEBS_EVENTS) - 1;
1137                         if (pebs_status == (1 << bit))
1138                                 return at;
1139                 }
1140         }
1141         return NULL;
1142 }
1143
1144 static void __intel_pmu_pebs_event(struct perf_event *event,
1145                                    struct pt_regs *iregs,
1146                                    void *base, void *top,
1147                                    int bit, int count)
1148 {
1149         struct perf_sample_data data;
1150         struct pt_regs regs;
1151         void *at = get_next_pebs_record_by_bit(base, top, bit);
1152
1153         if (!intel_pmu_save_and_restart(event) &&
1154             !(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD))
1155                 return;
1156
1157         while (count > 1) {
1158                 setup_pebs_sample_data(event, iregs, at, &data, &regs);
1159                 perf_event_output(event, &data, &regs);
1160                 at += x86_pmu.pebs_record_size;
1161                 at = get_next_pebs_record_by_bit(at, top, bit);
1162                 count--;
1163         }
1164
1165         setup_pebs_sample_data(event, iregs, at, &data, &regs);
1166
1167         /*
1168          * All but the last records are processed.
1169          * The last one is left to be able to call the overflow handler.
1170          */
1171         if (perf_event_overflow(event, &data, &regs)) {
1172                 x86_pmu_stop(event, 0);
1173                 return;
1174         }
1175
1176 }
1177
1178 static void intel_pmu_drain_pebs_core(struct pt_regs *iregs)
1179 {
1180         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1181         struct debug_store *ds = cpuc->ds;
1182         struct perf_event *event = cpuc->events[0]; /* PMC0 only */
1183         struct pebs_record_core *at, *top;
1184         int n;
1185
1186         if (!x86_pmu.pebs_active)
1187                 return;
1188
1189         at  = (struct pebs_record_core *)(unsigned long)ds->pebs_buffer_base;
1190         top = (struct pebs_record_core *)(unsigned long)ds->pebs_index;
1191
1192         /*
1193          * Whatever else happens, drain the thing
1194          */
1195         ds->pebs_index = ds->pebs_buffer_base;
1196
1197         if (!test_bit(0, cpuc->active_mask))
1198                 return;
1199
1200         WARN_ON_ONCE(!event);
1201
1202         if (!event->attr.precise_ip)
1203                 return;
1204
1205         n = top - at;
1206         if (n <= 0)
1207                 return;
1208
1209         __intel_pmu_pebs_event(event, iregs, at, top, 0, n);
1210 }
1211
1212 static void intel_pmu_drain_pebs_nhm(struct pt_regs *iregs)
1213 {
1214         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1215         struct debug_store *ds = cpuc->ds;
1216         struct perf_event *event;
1217         void *base, *at, *top;
1218         short counts[MAX_PEBS_EVENTS] = {};
1219         short error[MAX_PEBS_EVENTS] = {};
1220         int bit, i;
1221
1222         if (!x86_pmu.pebs_active)
1223                 return;
1224
1225         base = (struct pebs_record_nhm *)(unsigned long)ds->pebs_buffer_base;
1226         top = (struct pebs_record_nhm *)(unsigned long)ds->pebs_index;
1227
1228         ds->pebs_index = ds->pebs_buffer_base;
1229
1230         if (unlikely(base >= top))
1231                 return;
1232
1233         for (at = base; at < top; at += x86_pmu.pebs_record_size) {
1234                 struct pebs_record_nhm *p = at;
1235                 u64 pebs_status;
1236
1237                 /* PEBS v3 has accurate status bits */
1238                 if (x86_pmu.intel_cap.pebs_format >= 3) {
1239                         for_each_set_bit(bit, (unsigned long *)&p->status,
1240                                          MAX_PEBS_EVENTS)
1241                                 counts[bit]++;
1242
1243                         continue;
1244                 }
1245
1246                 pebs_status = p->status & cpuc->pebs_enabled;
1247                 pebs_status &= (1ULL << x86_pmu.max_pebs_events) - 1;
1248
1249                 bit = find_first_bit((unsigned long *)&pebs_status,
1250                                         x86_pmu.max_pebs_events);
1251                 if (WARN(bit >= x86_pmu.max_pebs_events,
1252                          "PEBS record without PEBS event! status=%Lx pebs_enabled=%Lx active_mask=%Lx",
1253                          (unsigned long long)p->status, (unsigned long long)cpuc->pebs_enabled,
1254                          *(unsigned long long *)cpuc->active_mask))
1255                         continue;
1256
1257                 /*
1258                  * The PEBS hardware does not deal well with the situation
1259                  * when events happen near to each other and multiple bits
1260                  * are set. But it should happen rarely.
1261                  *
1262                  * If these events include one PEBS and multiple non-PEBS
1263                  * events, it doesn't impact PEBS record. The record will
1264                  * be handled normally. (slow path)
1265                  *
1266                  * If these events include two or more PEBS events, the
1267                  * records for the events can be collapsed into a single
1268                  * one, and it's not possible to reconstruct all events
1269                  * that caused the PEBS record. It's called collision.
1270                  * If collision happened, the record will be dropped.
1271                  */
1272                 if (p->status != (1ULL << bit)) {
1273                         for_each_set_bit(i, (unsigned long *)&pebs_status,
1274                                          x86_pmu.max_pebs_events)
1275                                 error[i]++;
1276                         continue;
1277                 }
1278
1279                 counts[bit]++;
1280         }
1281
1282         for (bit = 0; bit < x86_pmu.max_pebs_events; bit++) {
1283                 if ((counts[bit] == 0) && (error[bit] == 0))
1284                         continue;
1285
1286                 event = cpuc->events[bit];
1287                 WARN_ON_ONCE(!event);
1288                 WARN_ON_ONCE(!event->attr.precise_ip);
1289
1290                 /* log dropped samples number */
1291                 if (error[bit])
1292                         perf_log_lost_samples(event, error[bit]);
1293
1294                 if (counts[bit]) {
1295                         __intel_pmu_pebs_event(event, iregs, base,
1296                                                top, bit, counts[bit]);
1297                 }
1298         }
1299 }
1300
1301 /*
1302  * BTS, PEBS probe and setup
1303  */
1304
1305 void __init intel_ds_init(void)
1306 {
1307         /*
1308          * No support for 32bit formats
1309          */
1310         if (!boot_cpu_has(X86_FEATURE_DTES64))
1311                 return;
1312
1313         x86_pmu.bts  = boot_cpu_has(X86_FEATURE_BTS);
1314         x86_pmu.pebs = boot_cpu_has(X86_FEATURE_PEBS);
1315         x86_pmu.pebs_buffer_size = PEBS_BUFFER_SIZE;
1316         if (x86_pmu.pebs) {
1317                 char pebs_type = x86_pmu.intel_cap.pebs_trap ?  '+' : '-';
1318                 int format = x86_pmu.intel_cap.pebs_format;
1319
1320                 switch (format) {
1321                 case 0:
1322                         printk(KERN_CONT "PEBS fmt0%c, ", pebs_type);
1323                         x86_pmu.pebs_record_size = sizeof(struct pebs_record_core);
1324                         /*
1325                          * Using >PAGE_SIZE buffers makes the WRMSR to
1326                          * PERF_GLOBAL_CTRL in intel_pmu_enable_all()
1327                          * mysteriously hang on Core2.
1328                          *
1329                          * As a workaround, we don't do this.
1330                          */
1331                         x86_pmu.pebs_buffer_size = PAGE_SIZE;
1332                         x86_pmu.drain_pebs = intel_pmu_drain_pebs_core;
1333                         break;
1334
1335                 case 1:
1336                         printk(KERN_CONT "PEBS fmt1%c, ", pebs_type);
1337                         x86_pmu.pebs_record_size = sizeof(struct pebs_record_nhm);
1338                         x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
1339                         break;
1340
1341                 case 2:
1342                         pr_cont("PEBS fmt2%c, ", pebs_type);
1343                         x86_pmu.pebs_record_size = sizeof(struct pebs_record_hsw);
1344                         x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
1345                         break;
1346
1347                 case 3:
1348                         pr_cont("PEBS fmt3%c, ", pebs_type);
1349                         x86_pmu.pebs_record_size =
1350                                                 sizeof(struct pebs_record_skl);
1351                         x86_pmu.drain_pebs = intel_pmu_drain_pebs_nhm;
1352                         x86_pmu.free_running_flags |= PERF_SAMPLE_TIME;
1353                         break;
1354
1355                 default:
1356                         printk(KERN_CONT "no PEBS fmt%d%c, ", format, pebs_type);
1357                         x86_pmu.pebs = 0;
1358                 }
1359         }
1360 }
1361
1362 void perf_restore_debug_store(void)
1363 {
1364         struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds);
1365
1366         if (!x86_pmu.bts && !x86_pmu.pebs)
1367                 return;
1368
1369         wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds);
1370 }