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 /* PowerISA v2.07 format attribute structure*/
  34 extern struct attribute_group isa207_pmu_format_group;
  35
  36 /* Table of alternatives, sorted by column 0 */
  37 static const unsigned int event_alternatives[][MAX_ALT] = {
  38         { PM_MRK_ST_CMPL,               PM_MRK_ST_CMPL_ALT },
  39         { PM_BR_MRK_2PATH,              PM_BR_MRK_2PATH_ALT },
  40         { PM_L3_CO_MEPF,                PM_L3_CO_MEPF_ALT },
  41         { PM_MRK_DATA_FROM_L2MISS,      PM_MRK_DATA_FROM_L2MISS_ALT },
  42         { PM_CMPLU_STALL_ALT,           PM_CMPLU_STALL },
  43         { PM_BR_2PATH,                  PM_BR_2PATH_ALT },
  44         { PM_INST_DISP,                 PM_INST_DISP_ALT },
  45         { PM_RUN_CYC_ALT,               PM_RUN_CYC },
  46         { PM_MRK_FILT_MATCH,            PM_MRK_FILT_MATCH_ALT },
  47         { PM_LD_MISS_L1,                PM_LD_MISS_L1_ALT },
  48         { PM_RUN_INST_CMPL_ALT,         PM_RUN_INST_CMPL },
  49 };
  50
  51 static int power8_get_alternatives(u64 event, unsigned int flags, u64 alt[])
  52 {
  53         int i, j, num_alt = 0;
  54
  55         num_alt = isa207_get_alternatives(event, alt, event_alternatives,
  56                                         (int)ARRAY_SIZE(event_alternatives));
  57         if (flags & PPMU_ONLY_COUNT_RUN) {
  58                 /*
  59                  * We're only counting in RUN state, so PM_CYC is equivalent to
  60                  * PM_RUN_CYC and PM_INST_CMPL === PM_RUN_INST_CMPL.
  61                  */
  62                 j = num_alt;
  63                 for (i = 0; i < num_alt; ++i) {
  64                         switch (alt[i]) {
  65                         case PM_CYC:
  66                                 alt[j++] = PM_RUN_CYC;
  67                                 break;
  68                         case PM_RUN_CYC:
  69                                 alt[j++] = PM_CYC;
  70                                 break;
  71                         case PM_INST_CMPL:
  72                                 alt[j++] = PM_RUN_INST_CMPL;
  73                                 break;
  74                         case PM_RUN_INST_CMPL:
  75                                 alt[j++] = PM_INST_CMPL;
  76                                 break;
  77                         }
  78                 }
  79                 num_alt = j;
  80         }
  81
  82         return num_alt;
  83 }
  84
  85 GENERIC_EVENT_ATTR(cpu-cycles,                  PM_CYC);
  86 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     PM_GCT_NOSLOT_CYC);
  87 GENERIC_EVENT_ATTR(stalled-cycles-backend,      PM_CMPLU_STALL);
  88 GENERIC_EVENT_ATTR(instructions,                PM_INST_CMPL);
  89 GENERIC_EVENT_ATTR(branch-instructions,         PM_BRU_FIN);
  90 GENERIC_EVENT_ATTR(branch-misses,               PM_BR_MPRED_CMPL);
  91 GENERIC_EVENT_ATTR(cache-references,            PM_LD_REF_L1);
  92 GENERIC_EVENT_ATTR(cache-misses,                PM_LD_MISS_L1);
  93
  94 CACHE_EVENT_ATTR(L1-dcache-load-misses,         PM_LD_MISS_L1);
  95 CACHE_EVENT_ATTR(L1-dcache-loads,               PM_LD_REF_L1);
  96
  97 CACHE_EVENT_ATTR(L1-dcache-prefetches,          PM_L1_PREF);
  98 CACHE_EVENT_ATTR(L1-dcache-store-misses,        PM_ST_MISS_L1);
  99 CACHE_EVENT_ATTR(L1-icache-load-misses,         PM_L1_ICACHE_MISS);
 100 CACHE_EVENT_ATTR(L1-icache-loads,               PM_INST_FROM_L1);
 101 CACHE_EVENT_ATTR(L1-icache-prefetches,          PM_IC_PREF_WRITE);
 102
 103 CACHE_EVENT_ATTR(LLC-load-misses,               PM_DATA_FROM_L3MISS);
 104 CACHE_EVENT_ATTR(LLC-loads,                     PM_DATA_FROM_L3);
 105 CACHE_EVENT_ATTR(LLC-prefetches,                PM_L3_PREF_ALL);
 106 CACHE_EVENT_ATTR(LLC-store-misses,              PM_L2_ST_MISS);
 107 CACHE_EVENT_ATTR(LLC-stores,                    PM_L2_ST);
 108
 109 CACHE_EVENT_ATTR(branch-load-misses,            PM_BR_MPRED_CMPL);
 110 CACHE_EVENT_ATTR(branch-loads,                  PM_BRU_FIN);
 111 CACHE_EVENT_ATTR(dTLB-load-misses,              PM_DTLB_MISS);
 112 CACHE_EVENT_ATTR(iTLB-load-misses,              PM_ITLB_MISS);
 113
 114 static struct attribute *power8_events_attr[] = {
 115         GENERIC_EVENT_PTR(PM_CYC),
 116         GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
 117         GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 118         GENERIC_EVENT_PTR(PM_INST_CMPL),
 119         GENERIC_EVENT_PTR(PM_BRU_FIN),
 120         GENERIC_EVENT_PTR(PM_BR_MPRED_CMPL),
 121         GENERIC_EVENT_PTR(PM_LD_REF_L1),
 122         GENERIC_EVENT_PTR(PM_LD_MISS_L1),
 123
 124         CACHE_EVENT_PTR(PM_LD_MISS_L1),
 125         CACHE_EVENT_PTR(PM_LD_REF_L1),
 126         CACHE_EVENT_PTR(PM_L1_PREF),
 127         CACHE_EVENT_PTR(PM_ST_MISS_L1),
 128         CACHE_EVENT_PTR(PM_L1_ICACHE_MISS),
 129         CACHE_EVENT_PTR(PM_INST_FROM_L1),
 130         CACHE_EVENT_PTR(PM_IC_PREF_WRITE),
 131         CACHE_EVENT_PTR(PM_DATA_FROM_L3MISS),
 132         CACHE_EVENT_PTR(PM_DATA_FROM_L3),
 133         CACHE_EVENT_PTR(PM_L3_PREF_ALL),
 134         CACHE_EVENT_PTR(PM_L2_ST_MISS),
 135         CACHE_EVENT_PTR(PM_L2_ST),
 136
 137         CACHE_EVENT_PTR(PM_BR_MPRED_CMPL),
 138         CACHE_EVENT_PTR(PM_BRU_FIN),
 139
 140         CACHE_EVENT_PTR(PM_DTLB_MISS),
 141         CACHE_EVENT_PTR(PM_ITLB_MISS),
 142         NULL
 143 };
 144
 145 static struct attribute_group power8_pmu_events_group = {
 146         .name = "events",
 147         .attrs = power8_events_attr,
 148 };
 149
 150 static const struct attribute_group *power8_pmu_attr_groups[] = {
 151         &isa207_pmu_format_group,
 152         &power8_pmu_events_group,
 153         NULL,
 154 };
 155
 156 static int power8_generic_events[] = {
 157         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 158         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_GCT_NOSLOT_CYC,
 159         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 160         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 161         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BRU_FIN,
 162         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_MPRED_CMPL,
 163         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 164         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1,
 165 };
 166
 167 static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 168 {
 169         u64 pmu_bhrb_filter = 0;
 170
 171         /* BHRB and regular PMU events share the same privilege state
 172          * filter configuration. BHRB is always recorded along with a
 173          * regular PMU event. As the privilege state filter is handled
 174          * in the basic PMC configuration of the accompanying regular
 175          * PMU event, we ignore any separate BHRB specific request.
 176          */
 177
 178         /* No branch filter requested */
 179         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
 180                 return pmu_bhrb_filter;
 181
 182         /* Invalid branch filter options - HW does not support */
 183         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
 184                 return -1;
 185
 186         if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
 187                 return -1;
 188
 189         if (branch_sample_type & PERF_SAMPLE_BRANCH_CALL)
 190                 return -1;
 191
 192         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
 193                 pmu_bhrb_filter |= POWER8_MMCRA_IFM1;
 194                 return pmu_bhrb_filter;
 195         }
 196
 197         /* Every thing else is unsupported */
 198         return -1;
 199 }
 200
 201 static void power8_config_bhrb(u64 pmu_bhrb_filter)
 202 {
 203         /* Enable BHRB filter in PMU */
 204         mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
 205 }
 206
 207 #define C(x)    PERF_COUNT_HW_CACHE_##x
 208
 209 /*
 210  * Table of generalized cache-related events.
 211  * 0 means not supported, -1 means nonsensical, other values
 212  * are event codes.
 213  */
 214 static int power8_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 215         [ C(L1D) ] = {
 216                 [ C(OP_READ) ] = {
 217                         [ C(RESULT_ACCESS) ] = PM_LD_REF_L1,
 218                         [ C(RESULT_MISS)   ] = PM_LD_MISS_L1,
 219                 },
 220                 [ C(OP_WRITE) ] = {
 221                         [ C(RESULT_ACCESS) ] = 0,
 222                         [ C(RESULT_MISS)   ] = PM_ST_MISS_L1,
 223                 },
 224                 [ C(OP_PREFETCH) ] = {
 225                         [ C(RESULT_ACCESS) ] = PM_L1_PREF,
 226                         [ C(RESULT_MISS)   ] = 0,
 227                 },
 228         },
 229         [ C(L1I) ] = {
 230                 [ C(OP_READ) ] = {
 231                         [ C(RESULT_ACCESS) ] = PM_INST_FROM_L1,
 232                         [ C(RESULT_MISS)   ] = PM_L1_ICACHE_MISS,
 233                 },
 234                 [ C(OP_WRITE) ] = {
 235                         [ C(RESULT_ACCESS) ] = PM_L1_DEMAND_WRITE,
 236                         [ C(RESULT_MISS)   ] = -1,
 237                 },
 238                 [ C(OP_PREFETCH) ] = {
 239                         [ C(RESULT_ACCESS) ] = PM_IC_PREF_WRITE,
 240                         [ C(RESULT_MISS)   ] = 0,
 241                 },
 242         },
 243         [ C(LL) ] = {
 244                 [ C(OP_READ) ] = {
 245                         [ C(RESULT_ACCESS) ] = PM_DATA_FROM_L3,
 246                         [ C(RESULT_MISS)   ] = PM_DATA_FROM_L3MISS,
 247                 },
 248                 [ C(OP_WRITE) ] = {
 249                         [ C(RESULT_ACCESS) ] = PM_L2_ST,
 250                         [ C(RESULT_MISS)   ] = PM_L2_ST_MISS,
 251                 },
 252                 [ C(OP_PREFETCH) ] = {
 253                         [ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
 254                         [ C(RESULT_MISS)   ] = 0,
 255                 },
 256         },
 257         [ C(DTLB) ] = {
 258                 [ C(OP_READ) ] = {
 259                         [ C(RESULT_ACCESS) ] = 0,
 260                         [ C(RESULT_MISS)   ] = PM_DTLB_MISS,
 261                 },
 262                 [ C(OP_WRITE) ] = {
 263                         [ C(RESULT_ACCESS) ] = -1,
 264                         [ C(RESULT_MISS)   ] = -1,
 265                 },
 266                 [ C(OP_PREFETCH) ] = {
 267                         [ C(RESULT_ACCESS) ] = -1,
 268                         [ C(RESULT_MISS)   ] = -1,
 269                 },
 270         },
 271         [ C(ITLB) ] = {
 272                 [ C(OP_READ) ] = {
 273                         [ C(RESULT_ACCESS) ] = 0,
 274                         [ C(RESULT_MISS)   ] = PM_ITLB_MISS,
 275                 },
 276                 [ C(OP_WRITE) ] = {
 277                         [ C(RESULT_ACCESS) ] = -1,
 278                         [ C(RESULT_MISS)   ] = -1,
 279                 },
 280                 [ C(OP_PREFETCH) ] = {
 281                         [ C(RESULT_ACCESS) ] = -1,
 282                         [ C(RESULT_MISS)   ] = -1,
 283                 },
 284         },
 285         [ C(BPU) ] = {
 286                 [ C(OP_READ) ] = {
 287                         [ C(RESULT_ACCESS) ] = PM_BRU_FIN,
 288                         [ C(RESULT_MISS)   ] = PM_BR_MPRED_CMPL,
 289                 },
 290                 [ C(OP_WRITE) ] = {
 291                         [ C(RESULT_ACCESS) ] = -1,
 292                         [ C(RESULT_MISS)   ] = -1,
 293                 },
 294                 [ C(OP_PREFETCH) ] = {
 295                         [ C(RESULT_ACCESS) ] = -1,
 296                         [ C(RESULT_MISS)   ] = -1,
 297                 },
 298         },
 299         [ C(NODE) ] = {
 300                 [ C(OP_READ) ] = {
 301                         [ C(RESULT_ACCESS) ] = -1,
 302                         [ C(RESULT_MISS)   ] = -1,
 303                 },
 304                 [ C(OP_WRITE) ] = {
 305                         [ C(RESULT_ACCESS) ] = -1,
 306                         [ C(RESULT_MISS)   ] = -1,
 307                 },
 308                 [ C(OP_PREFETCH) ] = {
 309                         [ C(RESULT_ACCESS) ] = -1,
 310                         [ C(RESULT_MISS)   ] = -1,
 311                 },
 312         },
 313 };
 314
 315 #undef C
 316
 317 static struct power_pmu power8_pmu = {
 318         .name                   = "POWER8",
 319         .n_counter              = MAX_PMU_COUNTERS,
 320         .max_alternatives       = MAX_ALT + 1,
 321         .add_fields             = ISA207_ADD_FIELDS,
 322         .test_adder             = ISA207_TEST_ADDER,
 323         .compute_mmcr           = isa207_compute_mmcr,
 324         .config_bhrb            = power8_config_bhrb,
 325         .bhrb_filter_map        = power8_bhrb_filter_map,
 326         .get_constraint         = isa207_get_constraint,
 327         .get_alternatives       = power8_get_alternatives,
 328         .disable_pmc            = isa207_disable_pmc,
 329         .flags                  = PPMU_HAS_SIER | PPMU_ARCH_207S,
 330         .n_generic              = ARRAY_SIZE(power8_generic_events),
 331         .generic_events         = power8_generic_events,
 332         .cache_events           = &power8_cache_events,
 333         .attr_groups            = power8_pmu_attr_groups,
 334         .bhrb_nr                = 32,
 335 };
 336
 337 static int __init init_power8_pmu(void)
 338 {
 339         int rc;
 340
 341         if (!cur_cpu_spec->oprofile_cpu_type ||
 342             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8"))
 343                 return -ENODEV;
 344
 345         rc = register_power_pmu(&power8_pmu);
 346         if (rc)
 347                 return rc;
 348
 349         /* Tell userspace that EBB is supported */
 350         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
 351
 352         if (cpu_has_feature(CPU_FTR_PMAO_BUG))
 353                 pr_info("PMAO restore workaround active.\n");
 354
 355         return 0;
 356 }
 357 early_initcall(init_power8_pmu);