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 #define POWER8_MMCRA_BHRB_MASK          0x00000000C0000000UL
  33
  34 /*
  35  * Raw event encoding for PowerISA v2.07 (Power8):
  36  *
  37  *        60        56        52        48        44        40        36        32
  38  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
  39  *   | | [ ]                           [      thresh_cmp     ]   [  thresh_ctl   ]
  40  *   | |  |                                                              |
  41  *   | |  *- IFM (Linux)                 thresh start/stop OR FAB match -*
  42  *   | *- BHRB (Linux)
  43  *   *- EBB (Linux)
  44  *
  45  *        28        24        20        16        12         8         4         0
  46  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
  47  *   [   ] [  sample ]   [cache]   [ pmc ]   [unit ]   c     m   [    pmcxsel    ]
  48  *     |        |           |                          |     |
  49  *     |        |           |                          |     *- mark
  50  *     |        |           *- L1/L2/L3 cache_sel      |
  51  *     |        |                                      |
  52  *     |        *- sampling mode for marked events     *- combine
  53  *     |
  54  *     *- thresh_sel
  55  *
  56  * Below uses IBM bit numbering.
  57  *
  58  * MMCR1[x:y] = unit    (PMCxUNIT)
  59  * MMCR1[x]   = combine (PMCxCOMB)
  60  *
  61  * if pmc == 3 and unit == 0 and pmcxsel[0:6] == 0b0101011
  62  *      # PM_MRK_FAB_RSP_MATCH
  63  *      MMCR1[20:27] = thresh_ctl   (FAB_CRESP_MATCH / FAB_TYPE_MATCH)
  64  * else if pmc == 4 and unit == 0xf and pmcxsel[0:6] == 0b0101001
  65  *      # PM_MRK_FAB_RSP_MATCH_CYC
  66  *      MMCR1[20:27] = thresh_ctl   (FAB_CRESP_MATCH / FAB_TYPE_MATCH)
  67  * else
  68  *      MMCRA[48:55] = thresh_ctl   (THRESH START/END)
  69  *
  70  * if thresh_sel:
  71  *      MMCRA[45:47] = thresh_sel
  72  *
  73  * if thresh_cmp:
  74  *      MMCRA[22:24] = thresh_cmp[0:2]
  75  *      MMCRA[25:31] = thresh_cmp[3:9]
  76  *
  77  * if unit == 6 or unit == 7
  78  *      MMCRC[53:55] = cache_sel[1:3]      (L2EVENT_SEL)
  79  * else if unit == 8 or unit == 9:
  80  *      if cache_sel[0] == 0: # L3 bank
  81  *              MMCRC[47:49] = cache_sel[1:3]  (L3EVENT_SEL0)
  82  *      else if cache_sel[0] == 1:
  83  *              MMCRC[50:51] = cache_sel[2:3]  (L3EVENT_SEL1)
  84  * else if cache_sel[1]: # L1 event
  85  *      MMCR1[16] = cache_sel[2]
  86  *     MMCR1[17] = cache_sel[3]
  87  *
  88  * if mark:
  89  *      MMCRA[63]    = 1                (SAMPLE_ENABLE)
  90  *      MMCRA[57:59] = sample[0:2]      (RAND_SAMP_ELIG)
  91  *     MMCRA[61:62] = sample[3:4]      (RAND_SAMP_MODE)
  92  *
  93  * if EBB and BHRB:
  94  *      MMCRA[32:33] = IFM
  95  *
  96  */
  97
  98 /* PowerISA v2.07 format attribute structure*/
  99 extern struct attribute_group isa207_pmu_format_group;
 100
 101 /* Table of alternatives, sorted by column 0 */
 102 static const unsigned int event_alternatives[][MAX_ALT] = {
 103         { PM_MRK_ST_CMPL,               PM_MRK_ST_CMPL_ALT },
 104         { PM_BR_MRK_2PATH,              PM_BR_MRK_2PATH_ALT },
 105         { PM_L3_CO_MEPF,                PM_L3_CO_MEPF_ALT },
 106         { PM_MRK_DATA_FROM_L2MISS,      PM_MRK_DATA_FROM_L2MISS_ALT },
 107         { PM_CMPLU_STALL_ALT,           PM_CMPLU_STALL },
 108         { PM_BR_2PATH,                  PM_BR_2PATH_ALT },
 109         { PM_INST_DISP,                 PM_INST_DISP_ALT },
 110         { PM_RUN_CYC_ALT,               PM_RUN_CYC },
 111         { PM_MRK_FILT_MATCH,            PM_MRK_FILT_MATCH_ALT },
 112         { PM_LD_MISS_L1,                PM_LD_MISS_L1_ALT },
 113         { PM_RUN_INST_CMPL_ALT,         PM_RUN_INST_CMPL },
 114 };
 115
 116 static int power8_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 117 {
 118         int num_alt = 0;
 119
 120         num_alt = isa207_get_alternatives(event, alt,
 121                                           ARRAY_SIZE(event_alternatives), flags,
 122                                           event_alternatives);
 123
 124         return num_alt;
 125 }
 126
 127 GENERIC_EVENT_ATTR(cpu-cycles,                  PM_CYC);
 128 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     PM_GCT_NOSLOT_CYC);
 129 GENERIC_EVENT_ATTR(stalled-cycles-backend,      PM_CMPLU_STALL);
 130 GENERIC_EVENT_ATTR(instructions,                PM_INST_CMPL);
 131 GENERIC_EVENT_ATTR(branch-instructions,         PM_BRU_FIN);
 132 GENERIC_EVENT_ATTR(branch-misses,               PM_BR_MPRED_CMPL);
 133 GENERIC_EVENT_ATTR(cache-references,            PM_LD_REF_L1);
 134 GENERIC_EVENT_ATTR(cache-misses,                PM_LD_MISS_L1);
 135 GENERIC_EVENT_ATTR(mem_access,                  MEM_ACCESS);
 136
 137 CACHE_EVENT_ATTR(L1-dcache-load-misses,         PM_LD_MISS_L1);
 138 CACHE_EVENT_ATTR(L1-dcache-loads,               PM_LD_REF_L1);
 139
 140 CACHE_EVENT_ATTR(L1-dcache-prefetches,          PM_L1_PREF);
 141 CACHE_EVENT_ATTR(L1-dcache-store-misses,        PM_ST_MISS_L1);
 142 CACHE_EVENT_ATTR(L1-icache-load-misses,         PM_L1_ICACHE_MISS);
 143 CACHE_EVENT_ATTR(L1-icache-loads,               PM_INST_FROM_L1);
 144 CACHE_EVENT_ATTR(L1-icache-prefetches,          PM_IC_PREF_WRITE);
 145
 146 CACHE_EVENT_ATTR(LLC-load-misses,               PM_DATA_FROM_L3MISS);
 147 CACHE_EVENT_ATTR(LLC-loads,                     PM_DATA_FROM_L3);
 148 CACHE_EVENT_ATTR(LLC-prefetches,                PM_L3_PREF_ALL);
 149 CACHE_EVENT_ATTR(LLC-store-misses,              PM_L2_ST_MISS);
 150 CACHE_EVENT_ATTR(LLC-stores,                    PM_L2_ST);
 151
 152 CACHE_EVENT_ATTR(branch-load-misses,            PM_BR_MPRED_CMPL);
 153 CACHE_EVENT_ATTR(branch-loads,                  PM_BRU_FIN);
 154 CACHE_EVENT_ATTR(dTLB-load-misses,              PM_DTLB_MISS);
 155 CACHE_EVENT_ATTR(iTLB-load-misses,              PM_ITLB_MISS);
 156
 157 static struct attribute *power8_events_attr[] = {
 158         GENERIC_EVENT_PTR(PM_CYC),
 159         GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
 160         GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 161         GENERIC_EVENT_PTR(PM_INST_CMPL),
 162         GENERIC_EVENT_PTR(PM_BRU_FIN),
 163         GENERIC_EVENT_PTR(PM_BR_MPRED_CMPL),
 164         GENERIC_EVENT_PTR(PM_LD_REF_L1),
 165         GENERIC_EVENT_PTR(PM_LD_MISS_L1),
 166         GENERIC_EVENT_PTR(MEM_ACCESS),
 167
 168         CACHE_EVENT_PTR(PM_LD_MISS_L1),
 169         CACHE_EVENT_PTR(PM_LD_REF_L1),
 170         CACHE_EVENT_PTR(PM_L1_PREF),
 171         CACHE_EVENT_PTR(PM_ST_MISS_L1),
 172         CACHE_EVENT_PTR(PM_L1_ICACHE_MISS),
 173         CACHE_EVENT_PTR(PM_INST_FROM_L1),
 174         CACHE_EVENT_PTR(PM_IC_PREF_WRITE),
 175         CACHE_EVENT_PTR(PM_DATA_FROM_L3MISS),
 176         CACHE_EVENT_PTR(PM_DATA_FROM_L3),
 177         CACHE_EVENT_PTR(PM_L3_PREF_ALL),
 178         CACHE_EVENT_PTR(PM_L2_ST_MISS),
 179         CACHE_EVENT_PTR(PM_L2_ST),
 180
 181         CACHE_EVENT_PTR(PM_BR_MPRED_CMPL),
 182         CACHE_EVENT_PTR(PM_BRU_FIN),
 183
 184         CACHE_EVENT_PTR(PM_DTLB_MISS),
 185         CACHE_EVENT_PTR(PM_ITLB_MISS),
 186         NULL
 187 };
 188
 189 static struct attribute_group power8_pmu_events_group = {
 190         .name = "events",
 191         .attrs = power8_events_attr,
 192 };
 193
 194 static const struct attribute_group *power8_pmu_attr_groups[] = {
 195         &isa207_pmu_format_group,
 196         &power8_pmu_events_group,
 197         NULL,
 198 };
 199
 200 static int power8_generic_events[] = {
 201         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 202         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_GCT_NOSLOT_CYC,
 203         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 204         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 205         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BRU_FIN,
 206         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_MPRED_CMPL,
 207         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 208         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1,
 209 };
 210
 211 static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 212 {
 213         u64 pmu_bhrb_filter = 0;
 214
 215         /* BHRB and regular PMU events share the same privilege state
 216          * filter configuration. BHRB is always recorded along with a
 217          * regular PMU event. As the privilege state filter is handled
 218          * in the basic PMC configuration of the accompanying regular
 219          * PMU event, we ignore any separate BHRB specific request.
 220          */
 221
 222         /* No branch filter requested */
 223         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
 224                 return pmu_bhrb_filter;
 225
 226         /* Invalid branch filter options - HW does not support */
 227         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
 228                 return -1;
 229
 230         if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
 231                 return -1;
 232
 233         if (branch_sample_type & PERF_SAMPLE_BRANCH_CALL)
 234                 return -1;
 235
 236         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
 237                 pmu_bhrb_filter |= POWER8_MMCRA_IFM1;
 238                 return pmu_bhrb_filter;
 239         }
 240
 241         /* Every thing else is unsupported */
 242         return -1;
 243 }
 244
 245 static void power8_config_bhrb(u64 pmu_bhrb_filter)
 246 {
 247         pmu_bhrb_filter &= POWER8_MMCRA_BHRB_MASK;
 248
 249         /* Enable BHRB filter in PMU */
 250         mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
 251 }
 252
 253 #define C(x)    PERF_COUNT_HW_CACHE_##x
 254
 255 /*
 256  * Table of generalized cache-related events.
 257  * 0 means not supported, -1 means nonsensical, other values
 258  * are event codes.
 259  */
 260 static int power8_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 261         [ C(L1D) ] = {
 262                 [ C(OP_READ) ] = {
 263                         [ C(RESULT_ACCESS) ] = PM_LD_REF_L1,
 264                         [ C(RESULT_MISS)   ] = PM_LD_MISS_L1,
 265                 },
 266                 [ C(OP_WRITE) ] = {
 267                         [ C(RESULT_ACCESS) ] = 0,
 268                         [ C(RESULT_MISS)   ] = PM_ST_MISS_L1,
 269                 },
 270                 [ C(OP_PREFETCH) ] = {
 271                         [ C(RESULT_ACCESS) ] = PM_L1_PREF,
 272                         [ C(RESULT_MISS)   ] = 0,
 273                 },
 274         },
 275         [ C(L1I) ] = {
 276                 [ C(OP_READ) ] = {
 277                         [ C(RESULT_ACCESS) ] = PM_INST_FROM_L1,
 278                         [ C(RESULT_MISS)   ] = PM_L1_ICACHE_MISS,
 279                 },
 280                 [ C(OP_WRITE) ] = {
 281                         [ C(RESULT_ACCESS) ] = PM_L1_DEMAND_WRITE,
 282                         [ C(RESULT_MISS)   ] = -1,
 283                 },
 284                 [ C(OP_PREFETCH) ] = {
 285                         [ C(RESULT_ACCESS) ] = PM_IC_PREF_WRITE,
 286                         [ C(RESULT_MISS)   ] = 0,
 287                 },
 288         },
 289         [ C(LL) ] = {
 290                 [ C(OP_READ) ] = {
 291                         [ C(RESULT_ACCESS) ] = PM_DATA_FROM_L3,
 292                         [ C(RESULT_MISS)   ] = PM_DATA_FROM_L3MISS,
 293                 },
 294                 [ C(OP_WRITE) ] = {
 295                         [ C(RESULT_ACCESS) ] = PM_L2_ST,
 296                         [ C(RESULT_MISS)   ] = PM_L2_ST_MISS,
 297                 },
 298                 [ C(OP_PREFETCH) ] = {
 299                         [ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
 300                         [ C(RESULT_MISS)   ] = 0,
 301                 },
 302         },
 303         [ C(DTLB) ] = {
 304                 [ C(OP_READ) ] = {
 305                         [ C(RESULT_ACCESS) ] = 0,
 306                         [ C(RESULT_MISS)   ] = PM_DTLB_MISS,
 307                 },
 308                 [ C(OP_WRITE) ] = {
 309                         [ C(RESULT_ACCESS) ] = -1,
 310                         [ C(RESULT_MISS)   ] = -1,
 311                 },
 312                 [ C(OP_PREFETCH) ] = {
 313                         [ C(RESULT_ACCESS) ] = -1,
 314                         [ C(RESULT_MISS)   ] = -1,
 315                 },
 316         },
 317         [ C(ITLB) ] = {
 318                 [ C(OP_READ) ] = {
 319                         [ C(RESULT_ACCESS) ] = 0,
 320                         [ C(RESULT_MISS)   ] = PM_ITLB_MISS,
 321                 },
 322                 [ C(OP_WRITE) ] = {
 323                         [ C(RESULT_ACCESS) ] = -1,
 324                         [ C(RESULT_MISS)   ] = -1,
 325                 },
 326                 [ C(OP_PREFETCH) ] = {
 327                         [ C(RESULT_ACCESS) ] = -1,
 328                         [ C(RESULT_MISS)   ] = -1,
 329                 },
 330         },
 331         [ C(BPU) ] = {
 332                 [ C(OP_READ) ] = {
 333                         [ C(RESULT_ACCESS) ] = PM_BRU_FIN,
 334                         [ C(RESULT_MISS)   ] = PM_BR_MPRED_CMPL,
 335                 },
 336                 [ C(OP_WRITE) ] = {
 337                         [ C(RESULT_ACCESS) ] = -1,
 338                         [ C(RESULT_MISS)   ] = -1,
 339                 },
 340                 [ C(OP_PREFETCH) ] = {
 341                         [ C(RESULT_ACCESS) ] = -1,
 342                         [ C(RESULT_MISS)   ] = -1,
 343                 },
 344         },
 345         [ C(NODE) ] = {
 346                 [ C(OP_READ) ] = {
 347                         [ C(RESULT_ACCESS) ] = -1,
 348                         [ C(RESULT_MISS)   ] = -1,
 349                 },
 350                 [ C(OP_WRITE) ] = {
 351                         [ C(RESULT_ACCESS) ] = -1,
 352                         [ C(RESULT_MISS)   ] = -1,
 353                 },
 354                 [ C(OP_PREFETCH) ] = {
 355                         [ C(RESULT_ACCESS) ] = -1,
 356                         [ C(RESULT_MISS)   ] = -1,
 357                 },
 358         },
 359 };
 360
 361 #undef C
 362
 363 static struct power_pmu power8_pmu = {
 364         .name                   = "POWER8",
 365         .n_counter              = MAX_PMU_COUNTERS,
 366         .max_alternatives       = MAX_ALT + 1,
 367         .add_fields             = ISA207_ADD_FIELDS,
 368         .test_adder             = ISA207_TEST_ADDER,
 369         .compute_mmcr           = isa207_compute_mmcr,
 370         .config_bhrb            = power8_config_bhrb,
 371         .bhrb_filter_map        = power8_bhrb_filter_map,
 372         .get_constraint         = isa207_get_constraint,
 373         .get_alternatives       = power8_get_alternatives,
 374         .get_mem_data_src       = isa207_get_mem_data_src,
 375         .get_mem_weight         = isa207_get_mem_weight,
 376         .disable_pmc            = isa207_disable_pmc,
 377         .flags                  = PPMU_HAS_SIER | PPMU_ARCH_207S,
 378         .n_generic              = ARRAY_SIZE(power8_generic_events),
 379         .generic_events         = power8_generic_events,
 380         .cache_events           = &power8_cache_events,
 381         .attr_groups            = power8_pmu_attr_groups,
 382         .bhrb_nr                = 32,
 383 };
 384
 385 static int __init init_power8_pmu(void)
 386 {
 387         int rc;
 388
 389         if (!cur_cpu_spec->oprofile_cpu_type ||
 390             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8"))
 391                 return -ENODEV;
 392
 393         rc = register_power_pmu(&power8_pmu);
 394         if (rc)
 395                 return rc;
 396
 397         /* Tell userspace that EBB is supported */
 398         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
 399
 400         if (cpu_has_feature(CPU_FTR_PMAO_BUG))
 401                 pr_info("PMAO restore workaround active.\n");
 402
 403         return 0;
 404 }
 405 early_initcall(init_power8_pmu);