arch/powerpc/perf/power9-pmu.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Performance counter support for POWER9 processors.
   4  *
   5  * Copyright 2009 Paul Mackerras, IBM Corporation.
   6  * Copyright 2013 Michael Ellerman, IBM Corporation.
   7  * Copyright 2016 Madhavan Srinivasan, IBM Corporation.
   8  */
   9
  10 #define pr_fmt(fmt)     "power9-pmu: " fmt
  11
  12 #include "isa207-common.h"
  13
  14 /*
  15  * Raw event encoding for Power9:
  16  *
  17  *        60        56        52        48        44        40        36        32
  18  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
  19  *   | | [ ]                       [ ] [      thresh_cmp     ]   [  thresh_ctl   ]
  20  *   | |  |                         |                                     |
  21  *   | |  *- IFM (Linux)            |                  thresh start/stop -*
  22  *   | *- BHRB (Linux)              *sm
  23  *   *- EBB (Linux)
  24  *
  25  *        28        24        20        16        12         8         4         0
  26  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
  27  *   [   ] [  sample ]   [cache]   [ pmc ]   [unit ]   []    m   [    pmcxsel    ]
  28  *     |        |           |                          |     |
  29  *     |        |           |                          |     *- mark
  30  *     |        |           *- L1/L2/L3 cache_sel      |
  31  *     |        |                                      |
  32  *     |        *- sampling mode for marked events     *- combine
  33  *     |
  34  *     *- thresh_sel
  35  *
  36  * Below uses IBM bit numbering.
  37  *
  38  * MMCR1[x:y] = unit    (PMCxUNIT)
  39  * MMCR1[24]   = pmc1combine[0]
  40  * MMCR1[25]   = pmc1combine[1]
  41  * MMCR1[26]   = pmc2combine[0]
  42  * MMCR1[27]   = pmc2combine[1]
  43  * MMCR1[28]   = pmc3combine[0]
  44  * MMCR1[29]   = pmc3combine[1]
  45  * MMCR1[30]   = pmc4combine[0]
  46  * MMCR1[31]   = pmc4combine[1]
  47  *
  48  * if pmc == 3 and unit == 0 and pmcxsel[0:6] == 0b0101011
  49  *      MMCR1[20:27] = thresh_ctl
  50  * else if pmc == 4 and unit == 0xf and pmcxsel[0:6] == 0b0101001
  51  *      MMCR1[20:27] = thresh_ctl
  52  * else
  53  *      MMCRA[48:55] = thresh_ctl   (THRESH START/END)
  54  *
  55  * if thresh_sel:
  56  *      MMCRA[45:47] = thresh_sel
  57  *
  58  * if thresh_cmp:
  59  *      MMCRA[9:11] = thresh_cmp[0:2]
  60  *      MMCRA[12:18] = thresh_cmp[3:9]
  61  *
  62  * MMCR1[16] = cache_sel[2]
  63  * MMCR1[17] = cache_sel[3]
  64  *
  65  * if mark:
  66  *      MMCRA[63]    = 1                (SAMPLE_ENABLE)
  67  *      MMCRA[57:59] = sample[0:2]      (RAND_SAMP_ELIG)
  68  *     MMCRA[61:62] = sample[3:4]      (RAND_SAMP_MODE)
  69  *
  70  * if EBB and BHRB:
  71  *      MMCRA[32:33] = IFM
  72  *
  73  * MMCRA[SDAR_MODE]  = sm
  74  */
  75
  76 /*
  77  * Some power9 event codes.
  78  */
  79 #define EVENT(_name, _code)     _name = _code,
  80
  81 enum {
  82 #include "power9-events-list.h"
  83 };
  84
  85 #undef EVENT
  86
  87 /* MMCRA IFM bits - POWER9 */
  88 #define POWER9_MMCRA_IFM1               0x0000000040000000UL
  89 #define POWER9_MMCRA_IFM2               0x0000000080000000UL
  90 #define POWER9_MMCRA_IFM3               0x00000000C0000000UL
  91 #define POWER9_MMCRA_BHRB_MASK          0x00000000C0000000UL
  92
  93 extern u64 PERF_REG_EXTENDED_MASK;
  94
  95 /* Nasty Power9 specific hack */
  96 #define PVR_POWER9_CUMULUS              0x00002000
  97
  98 /* PowerISA v2.07 format attribute structure*/
  99 extern struct attribute_group isa207_pmu_format_group;
 100
 101 int p9_dd21_bl_ev[] = {
 102         PM_MRK_ST_DONE_L2,
 103         PM_RADIX_PWC_L1_HIT,
 104         PM_FLOP_CMPL,
 105         PM_MRK_NTF_FIN,
 106         PM_RADIX_PWC_L2_HIT,
 107         PM_IFETCH_THROTTLE,
 108         PM_MRK_L2_TM_ST_ABORT_SISTER,
 109         PM_RADIX_PWC_L3_HIT,
 110         PM_RUN_CYC_SMT2_MODE,
 111         PM_TM_TX_PASS_RUN_INST,
 112         PM_DISP_HELD_SYNC_HOLD,
 113 };
 114
 115 int p9_dd22_bl_ev[] = {
 116         PM_DTLB_MISS_16G,
 117         PM_DERAT_MISS_2M,
 118         PM_DTLB_MISS_2M,
 119         PM_MRK_DTLB_MISS_1G,
 120         PM_DTLB_MISS_4K,
 121         PM_DERAT_MISS_1G,
 122         PM_MRK_DERAT_MISS_2M,
 123         PM_MRK_DTLB_MISS_4K,
 124         PM_MRK_DTLB_MISS_16G,
 125         PM_DTLB_MISS_64K,
 126         PM_MRK_DERAT_MISS_1G,
 127         PM_MRK_DTLB_MISS_64K,
 128         PM_DISP_HELD_SYNC_HOLD,
 129         PM_DTLB_MISS_16M,
 130         PM_DTLB_MISS_1G,
 131         PM_MRK_DTLB_MISS_16M,
 132 };
 133
 134 /* Table of alternatives, sorted by column 0 */
 135 static const unsigned int power9_event_alternatives[][MAX_ALT] = {
 136         { PM_INST_DISP,                 PM_INST_DISP_ALT },
 137         { PM_RUN_CYC_ALT,               PM_RUN_CYC },
 138         { PM_RUN_INST_CMPL_ALT,         PM_RUN_INST_CMPL },
 139         { PM_LD_MISS_L1,                PM_LD_MISS_L1_ALT },
 140         { PM_BR_2PATH,                  PM_BR_2PATH_ALT },
 141 };
 142
 143 static int power9_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 144 {
 145         int num_alt = 0;
 146
 147         num_alt = isa207_get_alternatives(event, alt,
 148                                           ARRAY_SIZE(power9_event_alternatives), flags,
 149                                           power9_event_alternatives);
 150
 151         return num_alt;
 152 }
 153
 154 static int power9_check_attr_config(struct perf_event *ev)
 155 {
 156         u64 val;
 157         u64 event = ev->attr.config;
 158
 159         val = (event >> EVENT_SAMPLE_SHIFT) & EVENT_SAMPLE_MASK;
 160         if (val == 0xC || isa3XX_check_attr_config(ev))
 161                 return -EINVAL;
 162
 163         return 0;
 164 }
 165
 166 GENERIC_EVENT_ATTR(cpu-cycles,                  PM_CYC);
 167 GENERIC_EVENT_ATTR(stalled-cycles-frontend,     PM_ICT_NOSLOT_CYC);
 168 GENERIC_EVENT_ATTR(stalled-cycles-backend,      PM_CMPLU_STALL);
 169 GENERIC_EVENT_ATTR(instructions,                PM_INST_CMPL);
 170 GENERIC_EVENT_ATTR(branch-instructions,         PM_BR_CMPL);
 171 GENERIC_EVENT_ATTR(branch-misses,               PM_BR_MPRED_CMPL);
 172 GENERIC_EVENT_ATTR(cache-references,            PM_LD_REF_L1);
 173 GENERIC_EVENT_ATTR(cache-misses,                PM_LD_MISS_L1_FIN);
 174 GENERIC_EVENT_ATTR(mem-loads,                   MEM_LOADS);
 175 GENERIC_EVENT_ATTR(mem-stores,                  MEM_STORES);
 176
 177 CACHE_EVENT_ATTR(L1-dcache-load-misses,         PM_LD_MISS_L1_FIN);
 178 CACHE_EVENT_ATTR(L1-dcache-loads,               PM_LD_REF_L1);
 179 CACHE_EVENT_ATTR(L1-dcache-prefetches,          PM_L1_PREF);
 180 CACHE_EVENT_ATTR(L1-dcache-store-misses,        PM_ST_MISS_L1);
 181 CACHE_EVENT_ATTR(L1-icache-load-misses,         PM_L1_ICACHE_MISS);
 182 CACHE_EVENT_ATTR(L1-icache-loads,               PM_INST_FROM_L1);
 183 CACHE_EVENT_ATTR(L1-icache-prefetches,          PM_IC_PREF_WRITE);
 184 CACHE_EVENT_ATTR(LLC-load-misses,               PM_DATA_FROM_L3MISS);
 185 CACHE_EVENT_ATTR(LLC-loads,                     PM_DATA_FROM_L3);
 186 CACHE_EVENT_ATTR(LLC-prefetches,                PM_L3_PREF_ALL);
 187 CACHE_EVENT_ATTR(branch-load-misses,            PM_BR_MPRED_CMPL);
 188 CACHE_EVENT_ATTR(branch-loads,                  PM_BR_CMPL);
 189 CACHE_EVENT_ATTR(dTLB-load-misses,              PM_DTLB_MISS);
 190 CACHE_EVENT_ATTR(iTLB-load-misses,              PM_ITLB_MISS);
 191
 192 static struct attribute *power9_events_attr[] = {
 193         GENERIC_EVENT_PTR(PM_CYC),
 194         GENERIC_EVENT_PTR(PM_ICT_NOSLOT_CYC),
 195         GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 196         GENERIC_EVENT_PTR(PM_INST_CMPL),
 197         GENERIC_EVENT_PTR(PM_BR_CMPL),
 198         GENERIC_EVENT_PTR(PM_BR_MPRED_CMPL),
 199         GENERIC_EVENT_PTR(PM_LD_REF_L1),
 200         GENERIC_EVENT_PTR(PM_LD_MISS_L1_FIN),
 201         GENERIC_EVENT_PTR(MEM_LOADS),
 202         GENERIC_EVENT_PTR(MEM_STORES),
 203         CACHE_EVENT_PTR(PM_LD_MISS_L1_FIN),
 204         CACHE_EVENT_PTR(PM_LD_REF_L1),
 205         CACHE_EVENT_PTR(PM_L1_PREF),
 206         CACHE_EVENT_PTR(PM_ST_MISS_L1),
 207         CACHE_EVENT_PTR(PM_L1_ICACHE_MISS),
 208         CACHE_EVENT_PTR(PM_INST_FROM_L1),
 209         CACHE_EVENT_PTR(PM_IC_PREF_WRITE),
 210         CACHE_EVENT_PTR(PM_DATA_FROM_L3MISS),
 211         CACHE_EVENT_PTR(PM_DATA_FROM_L3),
 212         CACHE_EVENT_PTR(PM_L3_PREF_ALL),
 213         CACHE_EVENT_PTR(PM_BR_MPRED_CMPL),
 214         CACHE_EVENT_PTR(PM_BR_CMPL),
 215         CACHE_EVENT_PTR(PM_DTLB_MISS),
 216         CACHE_EVENT_PTR(PM_ITLB_MISS),
 217         NULL
 218 };
 219
 220 static struct attribute_group power9_pmu_events_group = {
 221         .name = "events",
 222         .attrs = power9_events_attr,
 223 };
 224
 225 PMU_FORMAT_ATTR(event,          "config:0-51");
 226 PMU_FORMAT_ATTR(pmcxsel,        "config:0-7");
 227 PMU_FORMAT_ATTR(mark,           "config:8");
 228 PMU_FORMAT_ATTR(combine,        "config:10-11");
 229 PMU_FORMAT_ATTR(unit,           "config:12-15");
 230 PMU_FORMAT_ATTR(pmc,            "config:16-19");
 231 PMU_FORMAT_ATTR(cache_sel,      "config:20-23");
 232 PMU_FORMAT_ATTR(sample_mode,    "config:24-28");
 233 PMU_FORMAT_ATTR(thresh_sel,     "config:29-31");
 234 PMU_FORMAT_ATTR(thresh_stop,    "config:32-35");
 235 PMU_FORMAT_ATTR(thresh_start,   "config:36-39");
 236 PMU_FORMAT_ATTR(thresh_cmp,     "config:40-49");
 237 PMU_FORMAT_ATTR(sdar_mode,      "config:50-51");
 238
 239 static struct attribute *power9_pmu_format_attr[] = {
 240         &format_attr_event.attr,
 241         &format_attr_pmcxsel.attr,
 242         &format_attr_mark.attr,
 243         &format_attr_combine.attr,
 244         &format_attr_unit.attr,
 245         &format_attr_pmc.attr,
 246         &format_attr_cache_sel.attr,
 247         &format_attr_sample_mode.attr,
 248         &format_attr_thresh_sel.attr,
 249         &format_attr_thresh_stop.attr,
 250         &format_attr_thresh_start.attr,
 251         &format_attr_thresh_cmp.attr,
 252         &format_attr_sdar_mode.attr,
 253         NULL,
 254 };
 255
 256 static struct attribute_group power9_pmu_format_group = {
 257         .name = "format",
 258         .attrs = power9_pmu_format_attr,
 259 };
 260
 261 static const struct attribute_group *power9_pmu_attr_groups[] = {
 262         &power9_pmu_format_group,
 263         &power9_pmu_events_group,
 264         NULL,
 265 };
 266
 267 static int power9_generic_events[] = {
 268         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 269         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_ICT_NOSLOT_CYC,
 270         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 271         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 272         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BR_CMPL,
 273         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_MPRED_CMPL,
 274         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 275         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1_FIN,
 276 };
 277
 278 static u64 power9_bhrb_filter_map(u64 branch_sample_type)
 279 {
 280         u64 pmu_bhrb_filter = 0;
 281
 282         /* BHRB and regular PMU events share the same privilege state
 283          * filter configuration. BHRB is always recorded along with a
 284          * regular PMU event. As the privilege state filter is handled
 285          * in the basic PMC configuration of the accompanying regular
 286          * PMU event, we ignore any separate BHRB specific request.
 287          */
 288
 289         /* No branch filter requested */
 290         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
 291                 return pmu_bhrb_filter;
 292
 293         /* Invalid branch filter options - HW does not support */
 294         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
 295                 return -1;
 296
 297         if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
 298                 return -1;
 299
 300         if (branch_sample_type & PERF_SAMPLE_BRANCH_CALL)
 301                 return -1;
 302
 303         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
 304                 pmu_bhrb_filter |= POWER9_MMCRA_IFM1;
 305                 return pmu_bhrb_filter;
 306         }
 307
 308         /* Every thing else is unsupported */
 309         return -1;
 310 }
 311
 312 static void power9_config_bhrb(u64 pmu_bhrb_filter)
 313 {
 314         pmu_bhrb_filter &= POWER9_MMCRA_BHRB_MASK;
 315
 316         /* Enable BHRB filter in PMU */
 317         mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
 318 }
 319
 320 #define C(x)    PERF_COUNT_HW_CACHE_##x
 321
 322 /*
 323  * Table of generalized cache-related events.
 324  * 0 means not supported, -1 means nonsensical, other values
 325  * are event codes.
 326  */
 327 static u64 power9_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 328         [ C(L1D) ] = {
 329                 [ C(OP_READ) ] = {
 330                         [ C(RESULT_ACCESS) ] = PM_LD_REF_L1,
 331                         [ C(RESULT_MISS)   ] = PM_LD_MISS_L1_FIN,
 332                 },
 333                 [ C(OP_WRITE) ] = {
 334                         [ C(RESULT_ACCESS) ] = 0,
 335                         [ C(RESULT_MISS)   ] = PM_ST_MISS_L1,
 336                 },
 337                 [ C(OP_PREFETCH) ] = {
 338                         [ C(RESULT_ACCESS) ] = PM_L1_PREF,
 339                         [ C(RESULT_MISS)   ] = 0,
 340                 },
 341         },
 342         [ C(L1I) ] = {
 343                 [ C(OP_READ) ] = {
 344                         [ C(RESULT_ACCESS) ] = PM_INST_FROM_L1,
 345                         [ C(RESULT_MISS)   ] = PM_L1_ICACHE_MISS,
 346                 },
 347                 [ C(OP_WRITE) ] = {
 348                         [ C(RESULT_ACCESS) ] = PM_L1_DEMAND_WRITE,
 349                         [ C(RESULT_MISS)   ] = -1,
 350                 },
 351                 [ C(OP_PREFETCH) ] = {
 352                         [ C(RESULT_ACCESS) ] = PM_IC_PREF_WRITE,
 353                         [ C(RESULT_MISS)   ] = 0,
 354                 },
 355         },
 356         [ C(LL) ] = {
 357                 [ C(OP_READ) ] = {
 358                         [ C(RESULT_ACCESS) ] = PM_DATA_FROM_L3,
 359                         [ C(RESULT_MISS)   ] = PM_DATA_FROM_L3MISS,
 360                 },
 361                 [ C(OP_WRITE) ] = {
 362                         [ C(RESULT_ACCESS) ] = 0,
 363                         [ C(RESULT_MISS)   ] = 0,
 364                 },
 365                 [ C(OP_PREFETCH) ] = {
 366                         [ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
 367                         [ C(RESULT_MISS)   ] = 0,
 368                 },
 369         },
 370         [ C(DTLB) ] = {
 371                 [ C(OP_READ) ] = {
 372                         [ C(RESULT_ACCESS) ] = 0,
 373                         [ C(RESULT_MISS)   ] = PM_DTLB_MISS,
 374                 },
 375                 [ C(OP_WRITE) ] = {
 376                         [ C(RESULT_ACCESS) ] = -1,
 377                         [ C(RESULT_MISS)   ] = -1,
 378                 },
 379                 [ C(OP_PREFETCH) ] = {
 380                         [ C(RESULT_ACCESS) ] = -1,
 381                         [ C(RESULT_MISS)   ] = -1,
 382                 },
 383         },
 384         [ C(ITLB) ] = {
 385                 [ C(OP_READ) ] = {
 386                         [ C(RESULT_ACCESS) ] = 0,
 387                         [ C(RESULT_MISS)   ] = PM_ITLB_MISS,
 388                 },
 389                 [ C(OP_WRITE) ] = {
 390                         [ C(RESULT_ACCESS) ] = -1,
 391                         [ C(RESULT_MISS)   ] = -1,
 392                 },
 393                 [ C(OP_PREFETCH) ] = {
 394                         [ C(RESULT_ACCESS) ] = -1,
 395                         [ C(RESULT_MISS)   ] = -1,
 396                 },
 397         },
 398         [ C(BPU) ] = {
 399                 [ C(OP_READ) ] = {
 400                         [ C(RESULT_ACCESS) ] = PM_BR_CMPL,
 401                         [ C(RESULT_MISS)   ] = PM_BR_MPRED_CMPL,
 402                 },
 403                 [ C(OP_WRITE) ] = {
 404                         [ C(RESULT_ACCESS) ] = -1,
 405                         [ C(RESULT_MISS)   ] = -1,
 406                 },
 407                 [ C(OP_PREFETCH) ] = {
 408                         [ C(RESULT_ACCESS) ] = -1,
 409                         [ C(RESULT_MISS)   ] = -1,
 410                 },
 411         },
 412         [ C(NODE) ] = {
 413                 [ C(OP_READ) ] = {
 414                         [ C(RESULT_ACCESS) ] = -1,
 415                         [ C(RESULT_MISS)   ] = -1,
 416                 },
 417                 [ C(OP_WRITE) ] = {
 418                         [ C(RESULT_ACCESS) ] = -1,
 419                         [ C(RESULT_MISS)   ] = -1,
 420                 },
 421                 [ C(OP_PREFETCH) ] = {
 422                         [ C(RESULT_ACCESS) ] = -1,
 423                         [ C(RESULT_MISS)   ] = -1,
 424                 },
 425         },
 426 };
 427
 428 #undef C
 429
 430 static struct power_pmu power9_pmu = {
 431         .name                   = "POWER9",
 432         .n_counter              = MAX_PMU_COUNTERS,
 433         .add_fields             = ISA207_ADD_FIELDS,
 434         .test_adder             = ISA207_TEST_ADDER,
 435         .group_constraint_mask  = CNST_CACHE_PMC4_MASK,
 436         .group_constraint_val   = CNST_CACHE_PMC4_VAL,
 437         .compute_mmcr           = isa207_compute_mmcr,
 438         .config_bhrb            = power9_config_bhrb,
 439         .bhrb_filter_map        = power9_bhrb_filter_map,
 440         .get_constraint         = isa207_get_constraint,
 441         .get_alternatives       = power9_get_alternatives,
 442         .get_mem_data_src       = isa207_get_mem_data_src,
 443         .get_mem_weight         = isa207_get_mem_weight,
 444         .disable_pmc            = isa207_disable_pmc,
 445         .flags                  = PPMU_HAS_SIER | PPMU_ARCH_207S,
 446         .n_generic              = ARRAY_SIZE(power9_generic_events),
 447         .generic_events         = power9_generic_events,
 448         .cache_events           = &power9_cache_events,
 449         .attr_groups            = power9_pmu_attr_groups,
 450         .bhrb_nr                = 32,
 451         .capabilities           = PERF_PMU_CAP_EXTENDED_REGS,
 452         .check_attr_config      = power9_check_attr_config,
 453 };
 454
 455 int init_power9_pmu(void)
 456 {
 457         int rc = 0;
 458         unsigned int pvr = mfspr(SPRN_PVR);
 459
 460         /* Comes from cpu_specs[] */
 461         if (!cur_cpu_spec->oprofile_cpu_type ||
 462             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power9"))
 463                 return -ENODEV;
 464
 465         /* Blacklist events */
 466         if (!(pvr & PVR_POWER9_CUMULUS)) {
 467                 if ((PVR_CFG(pvr) == 2) && (PVR_MIN(pvr) == 1)) {
 468                         power9_pmu.blacklist_ev = p9_dd21_bl_ev;
 469                         power9_pmu.n_blacklist_ev = ARRAY_SIZE(p9_dd21_bl_ev);
 470                 } else if ((PVR_CFG(pvr) == 2) && (PVR_MIN(pvr) == 2)) {
 471                         power9_pmu.blacklist_ev = p9_dd22_bl_ev;
 472                         power9_pmu.n_blacklist_ev = ARRAY_SIZE(p9_dd22_bl_ev);
 473                 }
 474         }
 475
 476         /* Set the PERF_REG_EXTENDED_MASK here */
 477         PERF_REG_EXTENDED_MASK = PERF_REG_PMU_MASK_300;
 478
 479         rc = register_power_pmu(&power9_pmu);
 480         if (rc)
 481                 return rc;
 482
 483         /* Tell userspace that EBB is supported */
 484         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
 485
 486         return 0;
 487 }