arch/powerpc/perf/power7-pmu.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Performance counter support for POWER7 processors.
   4  *
   5  * Copyright 2009 Paul Mackerras, IBM Corporation.
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/perf_event.h>
   9 #include <linux/string.h>
  10 #include <asm/reg.h>
  11 #include <asm/cputable.h>
  12
  13 #include "internal.h"
  14
  15 /*
  16  * Bits in event code for POWER7
  17  */
  18 #define PM_PMC_SH       16      /* PMC number (1-based) for direct events */
  19 #define PM_PMC_MSK      0xf
  20 #define PM_PMC_MSKS     (PM_PMC_MSK << PM_PMC_SH)
  21 #define PM_UNIT_SH      12      /* TTMMUX number and setting - unit select */
  22 #define PM_UNIT_MSK     0xf
  23 #define PM_COMBINE_SH   11      /* Combined event bit */
  24 #define PM_COMBINE_MSK  1
  25 #define PM_COMBINE_MSKS 0x800
  26 #define PM_L2SEL_SH     8       /* L2 event select */
  27 #define PM_L2SEL_MSK    7
  28 #define PM_PMCSEL_MSK   0xff
  29
  30 /*
  31  * Bits in MMCR1 for POWER7
  32  */
  33 #define MMCR1_TTM0SEL_SH        60
  34 #define MMCR1_TTM1SEL_SH        56
  35 #define MMCR1_TTM2SEL_SH        52
  36 #define MMCR1_TTM3SEL_SH        48
  37 #define MMCR1_TTMSEL_MSK        0xf
  38 #define MMCR1_L2SEL_SH          45
  39 #define MMCR1_L2SEL_MSK         7
  40 #define MMCR1_PMC1_COMBINE_SH   35
  41 #define MMCR1_PMC2_COMBINE_SH   34
  42 #define MMCR1_PMC3_COMBINE_SH   33
  43 #define MMCR1_PMC4_COMBINE_SH   32
  44 #define MMCR1_PMC1SEL_SH        24
  45 #define MMCR1_PMC2SEL_SH        16
  46 #define MMCR1_PMC3SEL_SH        8
  47 #define MMCR1_PMC4SEL_SH        0
  48 #define MMCR1_PMCSEL_SH(n)      (MMCR1_PMC1SEL_SH - (n) * 8)
  49 #define MMCR1_PMCSEL_MSK        0xff
  50
  51 /*
  52  * Power7 event codes.
  53  */
  54 #define EVENT(_name, _code) \
  55         _name = _code,
  56
  57 enum {
  58 #include "power7-events-list.h"
  59 };
  60 #undef EVENT
  61
  62 /*
  63  * Layout of constraint bits:
  64  * 6666555555555544444444443333333333222222222211111111110000000000
  65  * 3210987654321098765432109876543210987654321098765432109876543210
  66  *                                              < ><  ><><><><><><>
  67  *                                              L2  NC P6P5P4P3P2P1
  68  *
  69  * L2 - 16-18 - Required L2SEL value (select field)
  70  *
  71  * NC - number of counters
  72  *     15: NC error 0x8000
  73  *     12-14: number of events needing PMC1-4 0x7000
  74  *
  75  * P6
  76  *     11: P6 error 0x800
  77  *     10-11: Count of events needing PMC6
  78  *
  79  * P1..P5
  80  *     0-9: Count of events needing PMC1..PMC5
  81  */
  82
  83 static int power7_get_constraint(u64 event, unsigned long *maskp,
  84                                  unsigned long *valp, u64 event_config1 __maybe_unused)
  85 {
  86         int pmc, sh, unit;
  87         unsigned long mask = 0, value = 0;
  88
  89         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
  90         if (pmc) {
  91                 if (pmc > 6)
  92                         return -1;
  93                 sh = (pmc - 1) * 2;
  94                 mask |= 2 << sh;
  95                 value |= 1 << sh;
  96                 if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
  97                         return -1;
  98         }
  99         if (pmc < 5) {
 100                 /* need a counter from PMC1-4 set */
 101                 mask  |= 0x8000;
 102                 value |= 0x1000;
 103         }
 104
 105         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 106         if (unit == 6) {
 107                 /* L2SEL must be identical across events */
 108                 int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 109                 mask  |= 0x7 << 16;
 110                 value |= l2sel << 16;
 111         }
 112
 113         *maskp = mask;
 114         *valp = value;
 115         return 0;
 116 }
 117
 118 #define MAX_ALT 2       /* at most 2 alternatives for any event */
 119
 120 static const unsigned int event_alternatives[][MAX_ALT] = {
 121         { 0x200f2, 0x300f2 },           /* PM_INST_DISP */
 122         { 0x200f4, 0x600f4 },           /* PM_RUN_CYC */
 123         { 0x400fa, 0x500fa },           /* PM_RUN_INST_CMPL */
 124 };
 125
 126 /*
 127  * Scan the alternatives table for a match and return the
 128  * index into the alternatives table if found, else -1.
 129  */
 130 static int find_alternative(u64 event)
 131 {
 132         int i, j;
 133
 134         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 135                 if (event < event_alternatives[i][0])
 136                         break;
 137                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 138                         if (event == event_alternatives[i][j])
 139                                 return i;
 140         }
 141         return -1;
 142 }
 143
 144 static s64 find_alternative_decode(u64 event)
 145 {
 146         int pmc, psel;
 147
 148         /* this only handles the 4x decode events */
 149         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 150         psel = event & PM_PMCSEL_MSK;
 151         if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
 152                 return event - (1 << PM_PMC_SH) + 8;
 153         if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
 154                 return event + (1 << PM_PMC_SH) - 8;
 155         return -1;
 156 }
 157
 158 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 159 {
 160         int i, j, nalt = 1;
 161         s64 ae;
 162
 163         alt[0] = event;
 164         nalt = 1;
 165         i = find_alternative(event);
 166         if (i >= 0) {
 167                 for (j = 0; j < MAX_ALT; ++j) {
 168                         ae = event_alternatives[i][j];
 169                         if (ae && ae != event)
 170                                 alt[nalt++] = ae;
 171                 }
 172         } else {
 173                 ae = find_alternative_decode(event);
 174                 if (ae > 0)
 175                         alt[nalt++] = ae;
 176         }
 177
 178         if (flags & PPMU_ONLY_COUNT_RUN) {
 179                 /*
 180                  * We're only counting in RUN state,
 181                  * so PM_CYC is equivalent to PM_RUN_CYC
 182                  * and PM_INST_CMPL === PM_RUN_INST_CMPL.
 183                  * This doesn't include alternatives that don't provide
 184                  * any extra flexibility in assigning PMCs.
 185                  */
 186                 j = nalt;
 187                 for (i = 0; i < nalt; ++i) {
 188                         switch (alt[i]) {
 189                         case 0x1e:      /* PM_CYC */
 190                                 alt[j++] = 0x600f4;     /* PM_RUN_CYC */
 191                                 break;
 192                         case 0x600f4:   /* PM_RUN_CYC */
 193                                 alt[j++] = 0x1e;
 194                                 break;
 195                         case 0x2:       /* PM_PPC_CMPL */
 196                                 alt[j++] = 0x500fa;     /* PM_RUN_INST_CMPL */
 197                                 break;
 198                         case 0x500fa:   /* PM_RUN_INST_CMPL */
 199                                 alt[j++] = 0x2; /* PM_PPC_CMPL */
 200                                 break;
 201                         }
 202                 }
 203                 nalt = j;
 204         }
 205
 206         return nalt;
 207 }
 208
 209 /*
 210  * Returns 1 if event counts things relating to marked instructions
 211  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 212  */
 213 static int power7_marked_instr_event(u64 event)
 214 {
 215         int pmc, psel;
 216         int unit;
 217
 218         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 219         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 220         psel = event & PM_PMCSEL_MSK & ~1;      /* trim off edge/level bit */
 221         if (pmc >= 5)
 222                 return 0;
 223
 224         switch (psel >> 4) {
 225         case 2:
 226                 return pmc == 2 || pmc == 4;
 227         case 3:
 228                 if (psel == 0x3c)
 229                         return pmc == 1;
 230                 if (psel == 0x3e)
 231                         return pmc != 2;
 232                 return 1;
 233         case 4:
 234         case 5:
 235                 return unit == 0xd;
 236         case 6:
 237                 if (psel == 0x64)
 238                         return pmc >= 3;
 239                 break;
 240         case 8:
 241                 return unit == 0xd;
 242         }
 243         return 0;
 244 }
 245
 246 static int power7_compute_mmcr(u64 event[], int n_ev,
 247                                unsigned int hwc[], struct mmcr_regs *mmcr,
 248                                struct perf_event *pevents[],
 249                                u32 flags __maybe_unused)
 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->mmcr0 = 0;
 306         if (pmc_inuse & 1)
 307                 mmcr->mmcr0 = MMCR0_PMC1CE;
 308         if (pmc_inuse & 0x3e)
 309                 mmcr->mmcr0 |= MMCR0_PMCjCE;
 310         mmcr->mmcr1 = mmcr1;
 311         mmcr->mmcra = mmcra;
 312         return 0;
 313 }
 314
 315 static void power7_disable_pmc(unsigned int pmc, struct mmcr_regs *mmcr)
 316 {
 317         if (pmc <= 3)
 318                 mmcr->mmcr1 &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 319 }
 320
 321 static int power7_generic_events[] = {
 322         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 323         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_GCT_NOSLOT_CYC,
 324         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 325         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 326         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 327         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1,
 328         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BRU_FIN,
 329         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_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 u64 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,                  PM_CYC);
 379 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     PM_GCT_NOSLOT_CYC);
 380 GENERIC_EVENT_ATTR(stalled-cycles-backend,      PM_CMPLU_STALL);
 381 GENERIC_EVENT_ATTR(instructions,                PM_INST_CMPL);
 382 GENERIC_EVENT_ATTR(cache-references,            PM_LD_REF_L1);
 383 GENERIC_EVENT_ATTR(cache-misses,                PM_LD_MISS_L1);
 384 GENERIC_EVENT_ATTR(branch-instructions,         PM_BRU_FIN);
 385 GENERIC_EVENT_ATTR(branch-misses,               PM_BR_MPRED);
 386
 387 #define EVENT(_name, _code)     POWER_EVENT_ATTR(_name, _name);
 388 #include "power7-events-list.h"
 389 #undef EVENT
 390
 391 #define EVENT(_name, _code)     POWER_EVENT_PTR(_name),
 392
 393 static struct attribute *power7_events_attr[] = {
 394         GENERIC_EVENT_PTR(PM_CYC),
 395         GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
 396         GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 397         GENERIC_EVENT_PTR(PM_INST_CMPL),
 398         GENERIC_EVENT_PTR(PM_LD_REF_L1),
 399         GENERIC_EVENT_PTR(PM_LD_MISS_L1),
 400         GENERIC_EVENT_PTR(PM_BRU_FIN),
 401         GENERIC_EVENT_PTR(PM_BR_MPRED),
 402
 403         #include "power7-events-list.h"
 404         #undef EVENT
 405         NULL
 406 };
 407
 408 static struct attribute_group power7_pmu_events_group = {
 409         .name = "events",
 410         .attrs = power7_events_attr,
 411 };
 412
 413 PMU_FORMAT_ATTR(event, "config:0-19");
 414
 415 static struct attribute *power7_pmu_format_attr[] = {
 416         &format_attr_event.attr,
 417         NULL,
 418 };
 419
 420 static struct attribute_group power7_pmu_format_group = {
 421         .name = "format",
 422         .attrs = power7_pmu_format_attr,
 423 };
 424
 425 static const struct attribute_group *power7_pmu_attr_groups[] = {
 426         &power7_pmu_format_group,
 427         &power7_pmu_events_group,
 428         NULL,
 429 };
 430
 431 static struct power_pmu power7_pmu = {
 432         .name                   = "POWER7",
 433         .n_counter              = 6,
 434         .max_alternatives       = MAX_ALT + 1,
 435         .add_fields             = 0x1555ul,
 436         .test_adder             = 0x3000ul,
 437         .compute_mmcr           = power7_compute_mmcr,
 438         .get_constraint         = power7_get_constraint,
 439         .get_alternatives       = power7_get_alternatives,
 440         .disable_pmc            = power7_disable_pmc,
 441         .flags                  = PPMU_ALT_SIPR,
 442         .attr_groups            = power7_pmu_attr_groups,
 443         .n_generic              = ARRAY_SIZE(power7_generic_events),
 444         .generic_events         = power7_generic_events,
 445         .cache_events           = &power7_cache_events,
 446 };
 447
 448 int init_power7_pmu(void)
 449 {
 450         if (!cur_cpu_spec->oprofile_cpu_type ||
 451             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
 452                 return -ENODEV;
 453
 454         if (pvr_version_is(PVR_POWER7p))
 455                 power7_pmu.flags |= PPMU_SIAR_VALID;
 456
 457         return register_power_pmu(&power7_pmu);
 458 }