arch/powerpc/perf/power7-pmu.c

   1 /*
   2  * Performance counter support for POWER7 processors.
   3  *
   4  * Copyright 2009 Paul Mackerras, IBM Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/perf_event.h>
  13 #include <linux/string.h>
  14 #include <asm/reg.h>
  15 #include <asm/cputable.h>
  16
  17 /*
  18  * Bits in event code for POWER7
  19  */
  20 #define PM_PMC_SH       16      /* PMC number (1-based) for direct events */
  21 #define PM_PMC_MSK      0xf
  22 #define PM_PMC_MSKS     (PM_PMC_MSK << PM_PMC_SH)
  23 #define PM_UNIT_SH      12      /* TTMMUX number and setting - unit select */
  24 #define PM_UNIT_MSK     0xf
  25 #define PM_COMBINE_SH   11      /* Combined event bit */
  26 #define PM_COMBINE_MSK  1
  27 #define PM_COMBINE_MSKS 0x800
  28 #define PM_L2SEL_SH     8       /* L2 event select */
  29 #define PM_L2SEL_MSK    7
  30 #define PM_PMCSEL_MSK   0xff
  31
  32 /*
  33  * Bits in MMCR1 for POWER7
  34  */
  35 #define MMCR1_TTM0SEL_SH        60
  36 #define MMCR1_TTM1SEL_SH        56
  37 #define MMCR1_TTM2SEL_SH        52
  38 #define MMCR1_TTM3SEL_SH        48
  39 #define MMCR1_TTMSEL_MSK        0xf
  40 #define MMCR1_L2SEL_SH          45
  41 #define MMCR1_L2SEL_MSK         7
  42 #define MMCR1_PMC1_COMBINE_SH   35
  43 #define MMCR1_PMC2_COMBINE_SH   34
  44 #define MMCR1_PMC3_COMBINE_SH   33
  45 #define MMCR1_PMC4_COMBINE_SH   32
  46 #define MMCR1_PMC1SEL_SH        24
  47 #define MMCR1_PMC2SEL_SH        16
  48 #define MMCR1_PMC3SEL_SH        8
  49 #define MMCR1_PMC4SEL_SH        0
  50 #define MMCR1_PMCSEL_SH(n)      (MMCR1_PMC1SEL_SH - (n) * 8)
  51 #define MMCR1_PMCSEL_MSK        0xff
  52
  53 /*
  54  * Power7 event codes.
  55  */
  56 #define PME_PM_CYC                      0x1e
  57 #define PME_PM_GCT_NOSLOT_CYC           0x100f8
  58 #define PME_PM_CMPLU_STALL              0x4000a
  59 #define PME_PM_INST_CMPL                0x2
  60 #define PME_PM_LD_REF_L1                0xc880
  61 #define PME_PM_LD_MISS_L1               0x400f0
  62 #define PME_PM_BRU_FIN                  0x10068
  63 #define PME_PM_BRU_MPRED                0x400f6
  64
  65 /*
  66  * Layout of constraint bits:
  67  * 6666555555555544444444443333333333222222222211111111110000000000
  68  * 3210987654321098765432109876543210987654321098765432109876543210
  69  *                                              < ><  ><><><><><><>
  70  *                                              L2  NC P6P5P4P3P2P1
  71  *
  72  * L2 - 16-18 - Required L2SEL value (select field)
  73  *
  74  * NC - number of counters
  75  *     15: NC error 0x8000
  76  *     12-14: number of events needing PMC1-4 0x7000
  77  *
  78  * P6
  79  *     11: P6 error 0x800
  80  *     10-11: Count of events needing PMC6
  81  *
  82  * P1..P5
  83  *     0-9: Count of events needing PMC1..PMC5
  84  */
  85
  86 static int power7_get_constraint(u64 event, unsigned long *maskp,
  87                                  unsigned long *valp)
  88 {
  89         int pmc, sh, unit;
  90         unsigned long mask = 0, value = 0;
  91
  92         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
  93         if (pmc) {
  94                 if (pmc > 6)
  95                         return -1;
  96                 sh = (pmc - 1) * 2;
  97                 mask |= 2 << sh;
  98                 value |= 1 << sh;
  99                 if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
 100                         return -1;
 101         }
 102         if (pmc < 5) {
 103                 /* need a counter from PMC1-4 set */
 104                 mask  |= 0x8000;
 105                 value |= 0x1000;
 106         }
 107
 108         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 109         if (unit == 6) {
 110                 /* L2SEL must be identical across events */
 111                 int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 112                 mask  |= 0x7 << 16;
 113                 value |= l2sel << 16;
 114         }
 115
 116         *maskp = mask;
 117         *valp = value;
 118         return 0;
 119 }
 120
 121 #define MAX_ALT 2       /* at most 2 alternatives for any event */
 122
 123 static const unsigned int event_alternatives[][MAX_ALT] = {
 124         { 0x200f2, 0x300f2 },           /* PM_INST_DISP */
 125         { 0x200f4, 0x600f4 },           /* PM_RUN_CYC */
 126         { 0x400fa, 0x500fa },           /* PM_RUN_INST_CMPL */
 127 };
 128
 129 /*
 130  * Scan the alternatives table for a match and return the
 131  * index into the alternatives table if found, else -1.
 132  */
 133 static int find_alternative(u64 event)
 134 {
 135         int i, j;
 136
 137         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 138                 if (event < event_alternatives[i][0])
 139                         break;
 140                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 141                         if (event == event_alternatives[i][j])
 142                                 return i;
 143         }
 144         return -1;
 145 }
 146
 147 static s64 find_alternative_decode(u64 event)
 148 {
 149         int pmc, psel;
 150
 151         /* this only handles the 4x decode events */
 152         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 153         psel = event & PM_PMCSEL_MSK;
 154         if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
 155                 return event - (1 << PM_PMC_SH) + 8;
 156         if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
 157                 return event + (1 << PM_PMC_SH) - 8;
 158         return -1;
 159 }
 160
 161 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 162 {
 163         int i, j, nalt = 1;
 164         s64 ae;
 165
 166         alt[0] = event;
 167         nalt = 1;
 168         i = find_alternative(event);
 169         if (i >= 0) {
 170                 for (j = 0; j < MAX_ALT; ++j) {
 171                         ae = event_alternatives[i][j];
 172                         if (ae && ae != event)
 173                                 alt[nalt++] = ae;
 174                 }
 175         } else {
 176                 ae = find_alternative_decode(event);
 177                 if (ae > 0)
 178                         alt[nalt++] = ae;
 179         }
 180
 181         if (flags & PPMU_ONLY_COUNT_RUN) {
 182                 /*
 183                  * We're only counting in RUN state,
 184                  * so PM_CYC is equivalent to PM_RUN_CYC
 185                  * and PM_INST_CMPL === PM_RUN_INST_CMPL.
 186                  * This doesn't include alternatives that don't provide
 187                  * any extra flexibility in assigning PMCs.
 188                  */
 189                 j = nalt;
 190                 for (i = 0; i < nalt; ++i) {
 191                         switch (alt[i]) {
 192                         case 0x1e:      /* PM_CYC */
 193                                 alt[j++] = 0x600f4;     /* PM_RUN_CYC */
 194                                 break;
 195                         case 0x600f4:   /* PM_RUN_CYC */
 196                                 alt[j++] = 0x1e;
 197                                 break;
 198                         case 0x2:       /* PM_PPC_CMPL */
 199                                 alt[j++] = 0x500fa;     /* PM_RUN_INST_CMPL */
 200                                 break;
 201                         case 0x500fa:   /* PM_RUN_INST_CMPL */
 202                                 alt[j++] = 0x2; /* PM_PPC_CMPL */
 203                                 break;
 204                         }
 205                 }
 206                 nalt = j;
 207         }
 208
 209         return nalt;
 210 }
 211
 212 /*
 213  * Returns 1 if event counts things relating to marked instructions
 214  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 215  */
 216 static int power7_marked_instr_event(u64 event)
 217 {
 218         int pmc, psel;
 219         int unit;
 220
 221         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 222         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 223         psel = event & PM_PMCSEL_MSK & ~1;      /* trim off edge/level bit */
 224         if (pmc >= 5)
 225                 return 0;
 226
 227         switch (psel >> 4) {
 228         case 2:
 229                 return pmc == 2 || pmc == 4;
 230         case 3:
 231                 if (psel == 0x3c)
 232                         return pmc == 1;
 233                 if (psel == 0x3e)
 234                         return pmc != 2;
 235                 return 1;
 236         case 4:
 237         case 5:
 238                 return unit == 0xd;
 239         case 6:
 240                 if (psel == 0x64)
 241                         return pmc >= 3;
 242         case 8:
 243                 return unit == 0xd;
 244         }
 245         return 0;
 246 }
 247
 248 static int power7_compute_mmcr(u64 event[], int n_ev,
 249                                unsigned int hwc[], unsigned long mmcr[])
 250 {
 251         unsigned long mmcr1 = 0;
 252         unsigned long mmcra = MMCRA_SDAR_DCACHE_MISS | MMCRA_SDAR_ERAT_MISS;
 253         unsigned int pmc, unit, combine, l2sel, psel;
 254         unsigned int pmc_inuse = 0;
 255         int i;
 256
 257         /* First pass to count resource use */
 258         for (i = 0; i < n_ev; ++i) {
 259                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 260                 if (pmc) {
 261                         if (pmc > 6)
 262                                 return -1;
 263                         if (pmc_inuse & (1 << (pmc - 1)))
 264                                 return -1;
 265                         pmc_inuse |= 1 << (pmc - 1);
 266                 }
 267         }
 268
 269         /* Second pass: assign PMCs, set all MMCR1 fields */
 270         for (i = 0; i < n_ev; ++i) {
 271                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 272                 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 273                 combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
 274                 l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 275                 psel = event[i] & PM_PMCSEL_MSK;
 276                 if (!pmc) {
 277                         /* Bus event or any-PMC direct event */
 278                         for (pmc = 0; pmc < 4; ++pmc) {
 279                                 if (!(pmc_inuse & (1 << pmc)))
 280                                         break;
 281                         }
 282                         if (pmc >= 4)
 283                                 return -1;
 284                         pmc_inuse |= 1 << pmc;
 285                 } else {
 286                         /* Direct or decoded event */
 287                         --pmc;
 288                 }
 289                 if (pmc <= 3) {
 290                         mmcr1 |= (unsigned long) unit
 291                                 << (MMCR1_TTM0SEL_SH - 4 * pmc);
 292                         mmcr1 |= (unsigned long) combine
 293                                 << (MMCR1_PMC1_COMBINE_SH - pmc);
 294                         mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc);
 295                         if (unit == 6)  /* L2 events */
 296                                 mmcr1 |= (unsigned long) l2sel
 297                                         << MMCR1_L2SEL_SH;
 298                 }
 299                 if (power7_marked_instr_event(event[i]))
 300                         mmcra |= MMCRA_SAMPLE_ENABLE;
 301                 hwc[i] = pmc;
 302         }
 303
 304         /* Return MMCRx values */
 305         mmcr[0] = 0;
 306         if (pmc_inuse & 1)
 307                 mmcr[0] = MMCR0_PMC1CE;
 308         if (pmc_inuse & 0x3e)
 309                 mmcr[0] |= MMCR0_PMCjCE;
 310         mmcr[1] = mmcr1;
 311         mmcr[2] = mmcra;
 312         return 0;
 313 }
 314
 315 static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 316 {
 317         if (pmc <= 3)
 318                 mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 319 }
 320
 321 static int power7_generic_events[] = {
 322         [PERF_COUNT_HW_CPU_CYCLES] =                    PME_PM_CYC,
 323         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PME_PM_GCT_NOSLOT_CYC,
 324         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PME_PM_CMPLU_STALL,
 325         [PERF_COUNT_HW_INSTRUCTIONS] =                  PME_PM_INST_CMPL,
 326         [PERF_COUNT_HW_CACHE_REFERENCES] =              PME_PM_LD_REF_L1,
 327         [PERF_COUNT_HW_CACHE_MISSES] =                  PME_PM_LD_MISS_L1,
 328         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PME_PM_BRU_FIN,
 329         [PERF_COUNT_HW_BRANCH_MISSES] =                 PME_PM_BRU_MPRED,
 330 };
 331
 332 #define C(x)    PERF_COUNT_HW_CACHE_##x
 333
 334 /*
 335  * Table of generalized cache-related events.
 336  * 0 means not supported, -1 means nonsensical, other values
 337  * are event codes.
 338  */
 339 static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 340         [C(L1D)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 341                 [C(OP_READ)] = {        0xc880,         0x400f0 },
 342                 [C(OP_WRITE)] = {       0,              0x300f0 },
 343                 [C(OP_PREFETCH)] = {    0xd8b8,         0       },
 344         },
 345         [C(L1I)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 346                 [C(OP_READ)] = {        0,              0x200fc },
 347                 [C(OP_WRITE)] = {       -1,             -1      },
 348                 [C(OP_PREFETCH)] = {    0x408a,         0       },
 349         },
 350         [C(LL)] = {             /*      RESULT_ACCESS   RESULT_MISS */
 351                 [C(OP_READ)] = {        0x16080,        0x26080 },
 352                 [C(OP_WRITE)] = {       0x16082,        0x26082 },
 353                 [C(OP_PREFETCH)] = {    0,              0       },
 354         },
 355         [C(DTLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 356                 [C(OP_READ)] = {        0,              0x300fc },
 357                 [C(OP_WRITE)] = {       -1,             -1      },
 358                 [C(OP_PREFETCH)] = {    -1,             -1      },
 359         },
 360         [C(ITLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 361                 [C(OP_READ)] = {        0,              0x400fc },
 362                 [C(OP_WRITE)] = {       -1,             -1      },
 363                 [C(OP_PREFETCH)] = {    -1,             -1      },
 364         },
 365         [C(BPU)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 366                 [C(OP_READ)] = {        0x10068,        0x400f6 },
 367                 [C(OP_WRITE)] = {       -1,             -1      },
 368                 [C(OP_PREFETCH)] = {    -1,             -1      },
 369         },
 370         [C(NODE)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 371                 [C(OP_READ)] = {        -1,             -1      },
 372                 [C(OP_WRITE)] = {       -1,             -1      },
 373                 [C(OP_PREFETCH)] = {    -1,             -1      },
 374         },
 375 };
 376
 377
 378 GENERIC_EVENT_ATTR(cpu-cycles,                  CYC);
 379 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     GCT_NOSLOT_CYC);
 380 GENERIC_EVENT_ATTR(stalled-cycles-backend,      CMPLU_STALL);
 381 GENERIC_EVENT_ATTR(instructions,                INST_CMPL);
 382 GENERIC_EVENT_ATTR(cache-references,            LD_REF_L1);
 383 GENERIC_EVENT_ATTR(cache-misses,                LD_MISS_L1);
 384 GENERIC_EVENT_ATTR(branch-instructions,         BRU_FIN);
 385 GENERIC_EVENT_ATTR(branch-misses,               BRU_MPRED);
 386
 387 POWER_EVENT_ATTR(CYC,                           CYC);
 388 POWER_EVENT_ATTR(GCT_NOSLOT_CYC,                GCT_NOSLOT_CYC);
 389 POWER_EVENT_ATTR(CMPLU_STALL,                   CMPLU_STALL);
 390 POWER_EVENT_ATTR(INST_CMPL,                     INST_CMPL);
 391 POWER_EVENT_ATTR(LD_REF_L1,                     LD_REF_L1);
 392 POWER_EVENT_ATTR(LD_MISS_L1,                    LD_MISS_L1);
 393 POWER_EVENT_ATTR(BRU_FIN,                       BRU_FIN)
 394 POWER_EVENT_ATTR(BRU_MPRED,                     BRU_MPRED);
 395
 396 static struct attribute *power7_events_attr[] = {
 397         GENERIC_EVENT_PTR(CYC),
 398         GENERIC_EVENT_PTR(GCT_NOSLOT_CYC),
 399         GENERIC_EVENT_PTR(CMPLU_STALL),
 400         GENERIC_EVENT_PTR(INST_CMPL),
 401         GENERIC_EVENT_PTR(LD_REF_L1),
 402         GENERIC_EVENT_PTR(LD_MISS_L1),
 403         GENERIC_EVENT_PTR(BRU_FIN),
 404         GENERIC_EVENT_PTR(BRU_MPRED),
 405
 406         POWER_EVENT_PTR(CYC),
 407         POWER_EVENT_PTR(GCT_NOSLOT_CYC),
 408         POWER_EVENT_PTR(CMPLU_STALL),
 409         POWER_EVENT_PTR(INST_CMPL),
 410         POWER_EVENT_PTR(LD_REF_L1),
 411         POWER_EVENT_PTR(LD_MISS_L1),
 412         POWER_EVENT_PTR(BRU_FIN),
 413         POWER_EVENT_PTR(BRU_MPRED),
 414         NULL
 415 };
 416
 417
 418 static struct attribute_group power7_pmu_events_group = {
 419         .name = "events",
 420         .attrs = power7_events_attr,
 421 };
 422
 423 PMU_FORMAT_ATTR(event, "config:0-19");
 424
 425 static struct attribute *power7_pmu_format_attr[] = {
 426         &format_attr_event.attr,
 427         NULL,
 428 };
 429
 430 struct attribute_group power7_pmu_format_group = {
 431         .name = "format",
 432         .attrs = power7_pmu_format_attr,
 433 };
 434
 435 static const struct attribute_group *power7_pmu_attr_groups[] = {
 436         &power7_pmu_format_group,
 437         &power7_pmu_events_group,
 438         NULL,
 439 };
 440
 441 static struct power_pmu power7_pmu = {
 442         .name                   = "POWER7",
 443         .n_counter              = 6,
 444         .max_alternatives       = MAX_ALT + 1,
 445         .add_fields             = 0x1555ul,
 446         .test_adder             = 0x3000ul,
 447         .compute_mmcr           = power7_compute_mmcr,
 448         .get_constraint         = power7_get_constraint,
 449         .get_alternatives       = power7_get_alternatives,
 450         .disable_pmc            = power7_disable_pmc,
 451         .flags                  = PPMU_ALT_SIPR,
 452         .attr_groups            = power7_pmu_attr_groups,
 453         .n_generic              = ARRAY_SIZE(power7_generic_events),
 454         .generic_events         = power7_generic_events,
 455         .cache_events           = &power7_cache_events,
 456 };
 457
 458 static int __init init_power7_pmu(void)
 459 {
 460         if (!cur_cpu_spec->oprofile_cpu_type ||
 461             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
 462                 return -ENODEV;
 463
 464         if (pvr_version_is(PVR_POWER7p))
 465                 power7_pmu.flags |= PPMU_SIAR_VALID;
 466
 467         return register_power_pmu(&power7_pmu);
 468 }
 469
 470 early_initcall(init_power7_pmu);