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 EVENT(_name, _code) \
  57         _name = _code,
  58
  59 enum {
  60 #include "power7-events-list.h"
  61 };
  62 #undef EVENT
  63
  64 /*
  65  * Layout of constraint bits:
  66  * 6666555555555544444444443333333333222222222211111111110000000000
  67  * 3210987654321098765432109876543210987654321098765432109876543210
  68  *                                              < ><  ><><><><><><>
  69  *                                              L2  NC P6P5P4P3P2P1
  70  *
  71  * L2 - 16-18 - Required L2SEL value (select field)
  72  *
  73  * NC - number of counters
  74  *     15: NC error 0x8000
  75  *     12-14: number of events needing PMC1-4 0x7000
  76  *
  77  * P6
  78  *     11: P6 error 0x800
  79  *     10-11: Count of events needing PMC6
  80  *
  81  * P1..P5
  82  *     0-9: Count of events needing PMC1..PMC5
  83  */
  84
  85 static int power7_get_constraint(u64 event, unsigned long *maskp,
  86                                  unsigned long *valp)
  87 {
  88         int pmc, sh, unit;
  89         unsigned long mask = 0, value = 0;
  90
  91         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
  92         if (pmc) {
  93                 if (pmc > 6)
  94                         return -1;
  95                 sh = (pmc - 1) * 2;
  96                 mask |= 2 << sh;
  97                 value |= 1 << sh;
  98                 if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
  99                         return -1;
 100         }
 101         if (pmc < 5) {
 102                 /* need a counter from PMC1-4 set */
 103                 mask  |= 0x8000;
 104                 value |= 0x1000;
 105         }
 106
 107         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 108         if (unit == 6) {
 109                 /* L2SEL must be identical across events */
 110                 int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 111                 mask  |= 0x7 << 16;
 112                 value |= l2sel << 16;
 113         }
 114
 115         *maskp = mask;
 116         *valp = value;
 117         return 0;
 118 }
 119
 120 #define MAX_ALT 2       /* at most 2 alternatives for any event */
 121
 122 static const unsigned int event_alternatives[][MAX_ALT] = {
 123         { 0x200f2, 0x300f2 },           /* PM_INST_DISP */
 124         { 0x200f4, 0x600f4 },           /* PM_RUN_CYC */
 125         { 0x400fa, 0x500fa },           /* PM_RUN_INST_CMPL */
 126 };
 127
 128 /*
 129  * Scan the alternatives table for a match and return the
 130  * index into the alternatives table if found, else -1.
 131  */
 132 static int find_alternative(u64 event)
 133 {
 134         int i, j;
 135
 136         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 137                 if (event < event_alternatives[i][0])
 138                         break;
 139                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 140                         if (event == event_alternatives[i][j])
 141                                 return i;
 142         }
 143         return -1;
 144 }
 145
 146 static s64 find_alternative_decode(u64 event)
 147 {
 148         int pmc, psel;
 149
 150         /* this only handles the 4x decode events */
 151         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 152         psel = event & PM_PMCSEL_MSK;
 153         if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
 154                 return event - (1 << PM_PMC_SH) + 8;
 155         if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
 156                 return event + (1 << PM_PMC_SH) - 8;
 157         return -1;
 158 }
 159
 160 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 161 {
 162         int i, j, nalt = 1;
 163         s64 ae;
 164
 165         alt[0] = event;
 166         nalt = 1;
 167         i = find_alternative(event);
 168         if (i >= 0) {
 169                 for (j = 0; j < MAX_ALT; ++j) {
 170                         ae = event_alternatives[i][j];
 171                         if (ae && ae != event)
 172                                 alt[nalt++] = ae;
 173                 }
 174         } else {
 175                 ae = find_alternative_decode(event);
 176                 if (ae > 0)
 177                         alt[nalt++] = ae;
 178         }
 179
 180         if (flags & PPMU_ONLY_COUNT_RUN) {
 181                 /*
 182                  * We're only counting in RUN state,
 183                  * so PM_CYC is equivalent to PM_RUN_CYC
 184                  * and PM_INST_CMPL === PM_RUN_INST_CMPL.
 185                  * This doesn't include alternatives that don't provide
 186                  * any extra flexibility in assigning PMCs.
 187                  */
 188                 j = nalt;
 189                 for (i = 0; i < nalt; ++i) {
 190                         switch (alt[i]) {
 191                         case 0x1e:      /* PM_CYC */
 192                                 alt[j++] = 0x600f4;     /* PM_RUN_CYC */
 193                                 break;
 194                         case 0x600f4:   /* PM_RUN_CYC */
 195                                 alt[j++] = 0x1e;
 196                                 break;
 197                         case 0x2:       /* PM_PPC_CMPL */
 198                                 alt[j++] = 0x500fa;     /* PM_RUN_INST_CMPL */
 199                                 break;
 200                         case 0x500fa:   /* PM_RUN_INST_CMPL */
 201                                 alt[j++] = 0x2; /* PM_PPC_CMPL */
 202                                 break;
 203                         }
 204                 }
 205                 nalt = j;
 206         }
 207
 208         return nalt;
 209 }
 210
 211 /*
 212  * Returns 1 if event counts things relating to marked instructions
 213  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 214  */
 215 static int power7_marked_instr_event(u64 event)
 216 {
 217         int pmc, psel;
 218         int unit;
 219
 220         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 221         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 222         psel = event & PM_PMCSEL_MSK & ~1;      /* trim off edge/level bit */
 223         if (pmc >= 5)
 224                 return 0;
 225
 226         switch (psel >> 4) {
 227         case 2:
 228                 return pmc == 2 || pmc == 4;
 229         case 3:
 230                 if (psel == 0x3c)
 231                         return pmc == 1;
 232                 if (psel == 0x3e)
 233                         return pmc != 2;
 234                 return 1;
 235         case 4:
 236         case 5:
 237                 return unit == 0xd;
 238         case 6:
 239                 if (psel == 0x64)
 240                         return pmc >= 3;
 241         case 8:
 242                 return unit == 0xd;
 243         }
 244         return 0;
 245 }
 246
 247 static int power7_compute_mmcr(u64 event[], int n_ev,
 248                                unsigned int hwc[], unsigned long mmcr[], struct perf_event *pevents[])
 249 {
 250         unsigned long mmcr1 = 0;
 251         unsigned long mmcra = MMCRA_SDAR_DCACHE_MISS | MMCRA_SDAR_ERAT_MISS;
 252         unsigned int pmc, unit, combine, l2sel, psel;
 253         unsigned int pmc_inuse = 0;
 254         int i;
 255
 256         /* First pass to count resource use */
 257         for (i = 0; i < n_ev; ++i) {
 258                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 259                 if (pmc) {
 260                         if (pmc > 6)
 261                                 return -1;
 262                         if (pmc_inuse & (1 << (pmc - 1)))
 263                                 return -1;
 264                         pmc_inuse |= 1 << (pmc - 1);
 265                 }
 266         }
 267
 268         /* Second pass: assign PMCs, set all MMCR1 fields */
 269         for (i = 0; i < n_ev; ++i) {
 270                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 271                 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 272                 combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
 273                 l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 274                 psel = event[i] & PM_PMCSEL_MSK;
 275                 if (!pmc) {
 276                         /* Bus event or any-PMC direct event */
 277                         for (pmc = 0; pmc < 4; ++pmc) {
 278                                 if (!(pmc_inuse & (1 << pmc)))
 279                                         break;
 280                         }
 281                         if (pmc >= 4)
 282                                 return -1;
 283                         pmc_inuse |= 1 << pmc;
 284                 } else {
 285                         /* Direct or decoded event */
 286                         --pmc;
 287                 }
 288                 if (pmc <= 3) {
 289                         mmcr1 |= (unsigned long) unit
 290                                 << (MMCR1_TTM0SEL_SH - 4 * pmc);
 291                         mmcr1 |= (unsigned long) combine
 292                                 << (MMCR1_PMC1_COMBINE_SH - pmc);
 293                         mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc);
 294                         if (unit == 6)  /* L2 events */
 295                                 mmcr1 |= (unsigned long) l2sel
 296                                         << MMCR1_L2SEL_SH;
 297                 }
 298                 if (power7_marked_instr_event(event[i]))
 299                         mmcra |= MMCRA_SAMPLE_ENABLE;
 300                 hwc[i] = pmc;
 301         }
 302
 303         /* Return MMCRx values */
 304         mmcr[0] = 0;
 305         if (pmc_inuse & 1)
 306                 mmcr[0] = MMCR0_PMC1CE;
 307         if (pmc_inuse & 0x3e)
 308                 mmcr[0] |= MMCR0_PMCjCE;
 309         mmcr[1] = mmcr1;
 310         mmcr[2] = mmcra;
 311         return 0;
 312 }
 313
 314 static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 315 {
 316         if (pmc <= 3)
 317                 mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 318 }
 319
 320 static int power7_generic_events[] = {
 321         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 322         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_GCT_NOSLOT_CYC,
 323         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 324         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 325         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 326         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1,
 327         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BRU_FIN,
 328         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_MPRED,
 329 };
 330
 331 #define C(x)    PERF_COUNT_HW_CACHE_##x
 332
 333 /*
 334  * Table of generalized cache-related events.
 335  * 0 means not supported, -1 means nonsensical, other values
 336  * are event codes.
 337  */
 338 static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 339         [C(L1D)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 340                 [C(OP_READ)] = {        0xc880,         0x400f0 },
 341                 [C(OP_WRITE)] = {       0,              0x300f0 },
 342                 [C(OP_PREFETCH)] = {    0xd8b8,         0       },
 343         },
 344         [C(L1I)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 345                 [C(OP_READ)] = {        0,              0x200fc },
 346                 [C(OP_WRITE)] = {       -1,             -1      },
 347                 [C(OP_PREFETCH)] = {    0x408a,         0       },
 348         },
 349         [C(LL)] = {             /*      RESULT_ACCESS   RESULT_MISS */
 350                 [C(OP_READ)] = {        0x16080,        0x26080 },
 351                 [C(OP_WRITE)] = {       0x16082,        0x26082 },
 352                 [C(OP_PREFETCH)] = {    0,              0       },
 353         },
 354         [C(DTLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 355                 [C(OP_READ)] = {        0,              0x300fc },
 356                 [C(OP_WRITE)] = {       -1,             -1      },
 357                 [C(OP_PREFETCH)] = {    -1,             -1      },
 358         },
 359         [C(ITLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 360                 [C(OP_READ)] = {        0,              0x400fc },
 361                 [C(OP_WRITE)] = {       -1,             -1      },
 362                 [C(OP_PREFETCH)] = {    -1,             -1      },
 363         },
 364         [C(BPU)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 365                 [C(OP_READ)] = {        0x10068,        0x400f6 },
 366                 [C(OP_WRITE)] = {       -1,             -1      },
 367                 [C(OP_PREFETCH)] = {    -1,             -1      },
 368         },
 369         [C(NODE)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 370                 [C(OP_READ)] = {        -1,             -1      },
 371                 [C(OP_WRITE)] = {       -1,             -1      },
 372                 [C(OP_PREFETCH)] = {    -1,             -1      },
 373         },
 374 };
 375
 376
 377 GENERIC_EVENT_ATTR(cpu-cycles,                  PM_CYC);
 378 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     PM_GCT_NOSLOT_CYC);
 379 GENERIC_EVENT_ATTR(stalled-cycles-backend,      PM_CMPLU_STALL);
 380 GENERIC_EVENT_ATTR(instructions,                PM_INST_CMPL);
 381 GENERIC_EVENT_ATTR(cache-references,            PM_LD_REF_L1);
 382 GENERIC_EVENT_ATTR(cache-misses,                PM_LD_MISS_L1);
 383 GENERIC_EVENT_ATTR(branch-instructions,         PM_BRU_FIN);
 384 GENERIC_EVENT_ATTR(branch-misses,               PM_BR_MPRED);
 385
 386 #define EVENT(_name, _code)     POWER_EVENT_ATTR(_name, _name);
 387 #include "power7-events-list.h"
 388 #undef EVENT
 389
 390 #define EVENT(_name, _code)     POWER_EVENT_PTR(_name),
 391
 392 static struct attribute *power7_events_attr[] = {
 393         GENERIC_EVENT_PTR(PM_CYC),
 394         GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
 395         GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 396         GENERIC_EVENT_PTR(PM_INST_CMPL),
 397         GENERIC_EVENT_PTR(PM_LD_REF_L1),
 398         GENERIC_EVENT_PTR(PM_LD_MISS_L1),
 399         GENERIC_EVENT_PTR(PM_BRU_FIN),
 400         GENERIC_EVENT_PTR(PM_BR_MPRED),
 401
 402         #include "power7-events-list.h"
 403         #undef EVENT
 404         NULL
 405 };
 406
 407 static struct attribute_group power7_pmu_events_group = {
 408         .name = "events",
 409         .attrs = power7_events_attr,
 410 };
 411
 412 PMU_FORMAT_ATTR(event, "config:0-19");
 413
 414 static struct attribute *power7_pmu_format_attr[] = {
 415         &format_attr_event.attr,
 416         NULL,
 417 };
 418
 419 static struct attribute_group power7_pmu_format_group = {
 420         .name = "format",
 421         .attrs = power7_pmu_format_attr,
 422 };
 423
 424 static const struct attribute_group *power7_pmu_attr_groups[] = {
 425         &power7_pmu_format_group,
 426         &power7_pmu_events_group,
 427         NULL,
 428 };
 429
 430 static struct power_pmu power7_pmu = {
 431         .name                   = "POWER7",
 432         .n_counter              = 6,
 433         .max_alternatives       = MAX_ALT + 1,
 434         .add_fields             = 0x1555ul,
 435         .test_adder             = 0x3000ul,
 436         .compute_mmcr           = power7_compute_mmcr,
 437         .get_constraint         = power7_get_constraint,
 438         .get_alternatives       = power7_get_alternatives,
 439         .disable_pmc            = power7_disable_pmc,
 440         .flags                  = PPMU_ALT_SIPR,
 441         .attr_groups            = power7_pmu_attr_groups,
 442         .n_generic              = ARRAY_SIZE(power7_generic_events),
 443         .generic_events         = power7_generic_events,
 444         .cache_events           = &power7_cache_events,
 445 };
 446
 447 static int __init init_power7_pmu(void)
 448 {
 449         if (!cur_cpu_spec->oprofile_cpu_type ||
 450             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
 451                 return -ENODEV;
 452
 453         if (pvr_version_is(PVR_POWER7p))
 454                 power7_pmu.flags |= PPMU_SIAR_VALID;
 455
 456         return register_power_pmu(&power7_pmu);
 457 }
 458
 459 early_initcall(init_power7_pmu);