arch/powerpc/perf/power8-pmu.c

   1 /*
   2  * Performance counter support for POWER8 processors.
   3  *
   4  * Copyright 2009 Paul Mackerras, IBM Corporation.
   5  * Copyright 2013 Michael Ellerman, IBM Corporation.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #define pr_fmt(fmt)     "power8-pmu: " fmt
  14
  15 #include "isa207-common.h"
  16
  17 /*
  18  * Some power8 event codes.
  19  */
  20 #define EVENT(_name, _code)     _name = _code,
  21
  22 enum {
  23 #include "power8-events-list.h"
  24 };
  25
  26 #undef EVENT
  27
  28 /* MMCRA IFM bits - POWER8 */
  29 #define POWER8_MMCRA_IFM1               0x0000000040000000UL
  30 #define POWER8_MMCRA_IFM2               0x0000000080000000UL
  31 #define POWER8_MMCRA_IFM3               0x00000000C0000000UL
  32
  33 /* Table of alternatives, sorted by column 0 */
  34 static const unsigned int event_alternatives[][MAX_ALT] = {
  35         { PM_MRK_ST_CMPL,               PM_MRK_ST_CMPL_ALT },
  36         { PM_BR_MRK_2PATH,              PM_BR_MRK_2PATH_ALT },
  37         { PM_L3_CO_MEPF,                PM_L3_CO_MEPF_ALT },
  38         { PM_MRK_DATA_FROM_L2MISS,      PM_MRK_DATA_FROM_L2MISS_ALT },
  39         { PM_CMPLU_STALL_ALT,           PM_CMPLU_STALL },
  40         { PM_BR_2PATH,                  PM_BR_2PATH_ALT },
  41         { PM_INST_DISP,                 PM_INST_DISP_ALT },
  42         { PM_RUN_CYC_ALT,               PM_RUN_CYC },
  43         { PM_MRK_FILT_MATCH,            PM_MRK_FILT_MATCH_ALT },
  44         { PM_LD_MISS_L1,                PM_LD_MISS_L1_ALT },
  45         { PM_RUN_INST_CMPL_ALT,         PM_RUN_INST_CMPL },
  46 };
  47
  48 /*
  49  * Scan the alternatives table for a match and return the
  50  * index into the alternatives table if found, else -1.
  51  */
  52 static int find_alternative(u64 event)
  53 {
  54         int i, j;
  55
  56         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
  57                 if (event < event_alternatives[i][0])
  58                         break;
  59
  60                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
  61                         if (event == event_alternatives[i][j])
  62                                 return i;
  63         }
  64
  65         return -1;
  66 }
  67
  68 static int power8_get_alternatives(u64 event, unsigned int flags, u64 alt[])
  69 {
  70         int i, j, num_alt = 0;
  71         u64 alt_event;
  72
  73         alt[num_alt++] = event;
  74
  75         i = find_alternative(event);
  76         if (i >= 0) {
  77                 /* Filter out the original event, it's already in alt[0] */
  78                 for (j = 0; j < MAX_ALT; ++j) {
  79                         alt_event = event_alternatives[i][j];
  80                         if (alt_event && alt_event != event)
  81                                 alt[num_alt++] = alt_event;
  82                 }
  83         }
  84
  85         if (flags & PPMU_ONLY_COUNT_RUN) {
  86                 /*
  87                  * We're only counting in RUN state, so PM_CYC is equivalent to
  88                  * PM_RUN_CYC and PM_INST_CMPL === PM_RUN_INST_CMPL.
  89                  */
  90                 j = num_alt;
  91                 for (i = 0; i < num_alt; ++i) {
  92                         switch (alt[i]) {
  93                         case PM_CYC:
  94                                 alt[j++] = PM_RUN_CYC;
  95                                 break;
  96                         case PM_RUN_CYC:
  97                                 alt[j++] = PM_CYC;
  98                                 break;
  99                         case PM_INST_CMPL:
 100                                 alt[j++] = PM_RUN_INST_CMPL;
 101                                 break;
 102                         case PM_RUN_INST_CMPL:
 103                                 alt[j++] = PM_INST_CMPL;
 104                                 break;
 105                         }
 106                 }
 107                 num_alt = j;
 108         }
 109
 110         return num_alt;
 111 }
 112
 113 GENERIC_EVENT_ATTR(cpu-cycles,                  PM_CYC);
 114 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     PM_GCT_NOSLOT_CYC);
 115 GENERIC_EVENT_ATTR(stalled-cycles-backend,      PM_CMPLU_STALL);
 116 GENERIC_EVENT_ATTR(instructions,                PM_INST_CMPL);
 117 GENERIC_EVENT_ATTR(branch-instructions,         PM_BRU_FIN);
 118 GENERIC_EVENT_ATTR(branch-misses,               PM_BR_MPRED_CMPL);
 119 GENERIC_EVENT_ATTR(cache-references,            PM_LD_REF_L1);
 120 GENERIC_EVENT_ATTR(cache-misses,                PM_LD_MISS_L1);
 121
 122 CACHE_EVENT_ATTR(L1-dcache-load-misses,         PM_LD_MISS_L1);
 123 CACHE_EVENT_ATTR(L1-dcache-loads,               PM_LD_REF_L1);
 124
 125 CACHE_EVENT_ATTR(L1-dcache-prefetches,          PM_L1_PREF);
 126 CACHE_EVENT_ATTR(L1-dcache-store-misses,        PM_ST_MISS_L1);
 127 CACHE_EVENT_ATTR(L1-icache-load-misses,         PM_L1_ICACHE_MISS);
 128 CACHE_EVENT_ATTR(L1-icache-loads,               PM_INST_FROM_L1);
 129 CACHE_EVENT_ATTR(L1-icache-prefetches,          PM_IC_PREF_WRITE);
 130
 131 CACHE_EVENT_ATTR(LLC-load-misses,               PM_DATA_FROM_L3MISS);
 132 CACHE_EVENT_ATTR(LLC-loads,                     PM_DATA_FROM_L3);
 133 CACHE_EVENT_ATTR(LLC-prefetches,                PM_L3_PREF_ALL);
 134 CACHE_EVENT_ATTR(LLC-store-misses,              PM_L2_ST_MISS);
 135 CACHE_EVENT_ATTR(LLC-stores,                    PM_L2_ST);
 136
 137 CACHE_EVENT_ATTR(branch-load-misses,            PM_BR_MPRED_CMPL);
 138 CACHE_EVENT_ATTR(branch-loads,                  PM_BRU_FIN);
 139 CACHE_EVENT_ATTR(dTLB-load-misses,              PM_DTLB_MISS);
 140 CACHE_EVENT_ATTR(iTLB-load-misses,              PM_ITLB_MISS);
 141
 142 static struct attribute *power8_events_attr[] = {
 143         GENERIC_EVENT_PTR(PM_CYC),
 144         GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
 145         GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 146         GENERIC_EVENT_PTR(PM_INST_CMPL),
 147         GENERIC_EVENT_PTR(PM_BRU_FIN),
 148         GENERIC_EVENT_PTR(PM_BR_MPRED_CMPL),
 149         GENERIC_EVENT_PTR(PM_LD_REF_L1),
 150         GENERIC_EVENT_PTR(PM_LD_MISS_L1),
 151
 152         CACHE_EVENT_PTR(PM_LD_MISS_L1),
 153         CACHE_EVENT_PTR(PM_LD_REF_L1),
 154         CACHE_EVENT_PTR(PM_L1_PREF),
 155         CACHE_EVENT_PTR(PM_ST_MISS_L1),
 156         CACHE_EVENT_PTR(PM_L1_ICACHE_MISS),
 157         CACHE_EVENT_PTR(PM_INST_FROM_L1),
 158         CACHE_EVENT_PTR(PM_IC_PREF_WRITE),
 159         CACHE_EVENT_PTR(PM_DATA_FROM_L3MISS),
 160         CACHE_EVENT_PTR(PM_DATA_FROM_L3),
 161         CACHE_EVENT_PTR(PM_L3_PREF_ALL),
 162         CACHE_EVENT_PTR(PM_L2_ST_MISS),
 163         CACHE_EVENT_PTR(PM_L2_ST),
 164
 165         CACHE_EVENT_PTR(PM_BR_MPRED_CMPL),
 166         CACHE_EVENT_PTR(PM_BRU_FIN),
 167
 168         CACHE_EVENT_PTR(PM_DTLB_MISS),
 169         CACHE_EVENT_PTR(PM_ITLB_MISS),
 170         NULL
 171 };
 172
 173 static struct attribute_group power8_pmu_events_group = {
 174         .name = "events",
 175         .attrs = power8_events_attr,
 176 };
 177
 178 PMU_FORMAT_ATTR(event,          "config:0-49");
 179 PMU_FORMAT_ATTR(pmcxsel,        "config:0-7");
 180 PMU_FORMAT_ATTR(mark,           "config:8");
 181 PMU_FORMAT_ATTR(combine,        "config:11");
 182 PMU_FORMAT_ATTR(unit,           "config:12-15");
 183 PMU_FORMAT_ATTR(pmc,            "config:16-19");
 184 PMU_FORMAT_ATTR(cache_sel,      "config:20-23");
 185 PMU_FORMAT_ATTR(sample_mode,    "config:24-28");
 186 PMU_FORMAT_ATTR(thresh_sel,     "config:29-31");
 187 PMU_FORMAT_ATTR(thresh_stop,    "config:32-35");
 188 PMU_FORMAT_ATTR(thresh_start,   "config:36-39");
 189 PMU_FORMAT_ATTR(thresh_cmp,     "config:40-49");
 190
 191 static struct attribute *power8_pmu_format_attr[] = {
 192         &format_attr_event.attr,
 193         &format_attr_pmcxsel.attr,
 194         &format_attr_mark.attr,
 195         &format_attr_combine.attr,
 196         &format_attr_unit.attr,
 197         &format_attr_pmc.attr,
 198         &format_attr_cache_sel.attr,
 199         &format_attr_sample_mode.attr,
 200         &format_attr_thresh_sel.attr,
 201         &format_attr_thresh_stop.attr,
 202         &format_attr_thresh_start.attr,
 203         &format_attr_thresh_cmp.attr,
 204         NULL,
 205 };
 206
 207 static struct attribute_group power8_pmu_format_group = {
 208         .name = "format",
 209         .attrs = power8_pmu_format_attr,
 210 };
 211
 212 static const struct attribute_group *power8_pmu_attr_groups[] = {
 213         &power8_pmu_format_group,
 214         &power8_pmu_events_group,
 215         NULL,
 216 };
 217
 218 static int power8_generic_events[] = {
 219         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 220         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_GCT_NOSLOT_CYC,
 221         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 222         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 223         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BRU_FIN,
 224         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_MPRED_CMPL,
 225         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 226         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1,
 227 };
 228
 229 static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 230 {
 231         u64 pmu_bhrb_filter = 0;
 232
 233         /* BHRB and regular PMU events share the same privilege state
 234          * filter configuration. BHRB is always recorded along with a
 235          * regular PMU event. As the privilege state filter is handled
 236          * in the basic PMC configuration of the accompanying regular
 237          * PMU event, we ignore any separate BHRB specific request.
 238          */
 239
 240         /* No branch filter requested */
 241         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
 242                 return pmu_bhrb_filter;
 243
 244         /* Invalid branch filter options - HW does not support */
 245         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
 246                 return -1;
 247
 248         if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
 249                 return -1;
 250
 251         if (branch_sample_type & PERF_SAMPLE_BRANCH_CALL)
 252                 return -1;
 253
 254         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
 255                 pmu_bhrb_filter |= POWER8_MMCRA_IFM1;
 256                 return pmu_bhrb_filter;
 257         }
 258
 259         /* Every thing else is unsupported */
 260         return -1;
 261 }
 262
 263 static void power8_config_bhrb(u64 pmu_bhrb_filter)
 264 {
 265         /* Enable BHRB filter in PMU */
 266         mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
 267 }
 268
 269 #define C(x)    PERF_COUNT_HW_CACHE_##x
 270
 271 /*
 272  * Table of generalized cache-related events.
 273  * 0 means not supported, -1 means nonsensical, other values
 274  * are event codes.
 275  */
 276 static int power8_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 277         [ C(L1D) ] = {
 278                 [ C(OP_READ) ] = {
 279                         [ C(RESULT_ACCESS) ] = PM_LD_REF_L1,
 280                         [ C(RESULT_MISS)   ] = PM_LD_MISS_L1,
 281                 },
 282                 [ C(OP_WRITE) ] = {
 283                         [ C(RESULT_ACCESS) ] = 0,
 284                         [ C(RESULT_MISS)   ] = PM_ST_MISS_L1,
 285                 },
 286                 [ C(OP_PREFETCH) ] = {
 287                         [ C(RESULT_ACCESS) ] = PM_L1_PREF,
 288                         [ C(RESULT_MISS)   ] = 0,
 289                 },
 290         },
 291         [ C(L1I) ] = {
 292                 [ C(OP_READ) ] = {
 293                         [ C(RESULT_ACCESS) ] = PM_INST_FROM_L1,
 294                         [ C(RESULT_MISS)   ] = PM_L1_ICACHE_MISS,
 295                 },
 296                 [ C(OP_WRITE) ] = {
 297                         [ C(RESULT_ACCESS) ] = PM_L1_DEMAND_WRITE,
 298                         [ C(RESULT_MISS)   ] = -1,
 299                 },
 300                 [ C(OP_PREFETCH) ] = {
 301                         [ C(RESULT_ACCESS) ] = PM_IC_PREF_WRITE,
 302                         [ C(RESULT_MISS)   ] = 0,
 303                 },
 304         },
 305         [ C(LL) ] = {
 306                 [ C(OP_READ) ] = {
 307                         [ C(RESULT_ACCESS) ] = PM_DATA_FROM_L3,
 308                         [ C(RESULT_MISS)   ] = PM_DATA_FROM_L3MISS,
 309                 },
 310                 [ C(OP_WRITE) ] = {
 311                         [ C(RESULT_ACCESS) ] = PM_L2_ST,
 312                         [ C(RESULT_MISS)   ] = PM_L2_ST_MISS,
 313                 },
 314                 [ C(OP_PREFETCH) ] = {
 315                         [ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
 316                         [ C(RESULT_MISS)   ] = 0,
 317                 },
 318         },
 319         [ C(DTLB) ] = {
 320                 [ C(OP_READ) ] = {
 321                         [ C(RESULT_ACCESS) ] = 0,
 322                         [ C(RESULT_MISS)   ] = PM_DTLB_MISS,
 323                 },
 324                 [ C(OP_WRITE) ] = {
 325                         [ C(RESULT_ACCESS) ] = -1,
 326                         [ C(RESULT_MISS)   ] = -1,
 327                 },
 328                 [ C(OP_PREFETCH) ] = {
 329                         [ C(RESULT_ACCESS) ] = -1,
 330                         [ C(RESULT_MISS)   ] = -1,
 331                 },
 332         },
 333         [ C(ITLB) ] = {
 334                 [ C(OP_READ) ] = {
 335                         [ C(RESULT_ACCESS) ] = 0,
 336                         [ C(RESULT_MISS)   ] = PM_ITLB_MISS,
 337                 },
 338                 [ C(OP_WRITE) ] = {
 339                         [ C(RESULT_ACCESS) ] = -1,
 340                         [ C(RESULT_MISS)   ] = -1,
 341                 },
 342                 [ C(OP_PREFETCH) ] = {
 343                         [ C(RESULT_ACCESS) ] = -1,
 344                         [ C(RESULT_MISS)   ] = -1,
 345                 },
 346         },
 347         [ C(BPU) ] = {
 348                 [ C(OP_READ) ] = {
 349                         [ C(RESULT_ACCESS) ] = PM_BRU_FIN,
 350                         [ C(RESULT_MISS)   ] = PM_BR_MPRED_CMPL,
 351                 },
 352                 [ C(OP_WRITE) ] = {
 353                         [ C(RESULT_ACCESS) ] = -1,
 354                         [ C(RESULT_MISS)   ] = -1,
 355                 },
 356                 [ C(OP_PREFETCH) ] = {
 357                         [ C(RESULT_ACCESS) ] = -1,
 358                         [ C(RESULT_MISS)   ] = -1,
 359                 },
 360         },
 361         [ C(NODE) ] = {
 362                 [ C(OP_READ) ] = {
 363                         [ C(RESULT_ACCESS) ] = -1,
 364                         [ C(RESULT_MISS)   ] = -1,
 365                 },
 366                 [ C(OP_WRITE) ] = {
 367                         [ C(RESULT_ACCESS) ] = -1,
 368                         [ C(RESULT_MISS)   ] = -1,
 369                 },
 370                 [ C(OP_PREFETCH) ] = {
 371                         [ C(RESULT_ACCESS) ] = -1,
 372                         [ C(RESULT_MISS)   ] = -1,
 373                 },
 374         },
 375 };
 376
 377 #undef C
 378
 379 static struct power_pmu power8_pmu = {
 380         .name                   = "POWER8",
 381         .n_counter              = MAX_PMU_COUNTERS,
 382         .max_alternatives       = MAX_ALT + 1,
 383         .add_fields             = ISA207_ADD_FIELDS,
 384         .test_adder             = ISA207_TEST_ADDER,
 385         .compute_mmcr           = isa207_compute_mmcr,
 386         .config_bhrb            = power8_config_bhrb,
 387         .bhrb_filter_map        = power8_bhrb_filter_map,
 388         .get_constraint         = isa207_get_constraint,
 389         .get_alternatives       = power8_get_alternatives,
 390         .disable_pmc            = isa207_disable_pmc,
 391         .flags                  = PPMU_HAS_SIER | PPMU_ARCH_207S,
 392         .n_generic              = ARRAY_SIZE(power8_generic_events),
 393         .generic_events         = power8_generic_events,
 394         .cache_events           = &power8_cache_events,
 395         .attr_groups            = power8_pmu_attr_groups,
 396         .bhrb_nr                = 32,
 397 };
 398
 399 static int __init init_power8_pmu(void)
 400 {
 401         int rc;
 402
 403         if (!cur_cpu_spec->oprofile_cpu_type ||
 404             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8"))
 405                 return -ENODEV;
 406
 407         rc = register_power_pmu(&power8_pmu);
 408         if (rc)
 409                 return rc;
 410
 411         /* Tell userspace that EBB is supported */
 412         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
 413
 414         if (cpu_has_feature(CPU_FTR_PMAO_BUG))
 415                 pr_info("PMAO restore workaround active.\n");
 416
 417         return 0;
 418 }
 419 early_initcall(init_power8_pmu);