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 <linux/kernel.h>
  16 #include <linux/perf_event.h>
  17 #include <asm/firmware.h>
  18 #include <asm/cputable.h>
  19
  20
  21 /*
  22  * Some power8 event codes.
  23  */
  24 #define PM_CYC                          0x0001e
  25 #define PM_GCT_NOSLOT_CYC               0x100f8
  26 #define PM_CMPLU_STALL                  0x4000a
  27 #define PM_INST_CMPL                    0x00002
  28 #define PM_BRU_FIN                      0x10068
  29 #define PM_BR_MPRED_CMPL                0x400f6
  30
  31 /* All L1 D cache load references counted at finish, gated by reject */
  32 #define PM_LD_REF_L1                    0x100ee
  33 /* Load Missed L1 */
  34 #define PM_LD_MISS_L1                   0x3e054
  35 /* Store Missed L1 */
  36 #define PM_ST_MISS_L1                   0x300f0
  37 /* L1 cache data prefetches */
  38 #define PM_L1_PREF                      0x0d8b8
  39 /* Instruction fetches from L1 */
  40 #define PM_INST_FROM_L1                 0x04080
  41 /* Demand iCache Miss */
  42 #define PM_L1_ICACHE_MISS               0x200fd
  43 /* Instruction Demand sectors wriittent into IL1 */
  44 #define PM_L1_DEMAND_WRITE              0x0408c
  45 /* Instruction prefetch written into IL1 */
  46 #define PM_IC_PREF_WRITE                0x0408e
  47 /* The data cache was reloaded from local core's L3 due to a demand load */
  48 #define PM_DATA_FROM_L3                 0x4c042
  49 /* Demand LD - L3 Miss (not L2 hit and not L3 hit) */
  50 #define PM_DATA_FROM_L3MISS             0x300fe
  51 /* All successful D-side store dispatches for this thread */
  52 #define PM_L2_ST                        0x17080
  53 /* All successful D-side store dispatches for this thread that were L2 Miss */
  54 #define PM_L2_ST_MISS                   0x17082
  55 /* Total HW L3 prefetches(Load+store) */
  56 #define PM_L3_PREF_ALL                  0x4e052
  57 /* Data PTEG reload */
  58 #define PM_DTLB_MISS                    0x300fc
  59 /* ITLB Reloaded */
  60 #define PM_ITLB_MISS                    0x400fc
  61
  62
  63 /*
  64  * Raw event encoding for POWER8:
  65  *
  66  *        60        56        52        48        44        40        36        32
  67  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
  68  *   | | [ ]                           [      thresh_cmp     ]   [  thresh_ctl   ]
  69  *   | |  |                                                              |
  70  *   | |  *- IFM (Linux)                 thresh start/stop OR FAB match -*
  71  *   | *- BHRB (Linux)
  72  *   *- EBB (Linux)
  73  *
  74  *        28        24        20        16        12         8         4         0
  75  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
  76  *   [   ] [  sample ]   [cache]   [ pmc ]   [unit ]   c     m   [    pmcxsel    ]
  77  *     |        |           |                          |     |
  78  *     |        |           |                          |     *- mark
  79  *     |        |           *- L1/L2/L3 cache_sel      |
  80  *     |        |                                      |
  81  *     |        *- sampling mode for marked events     *- combine
  82  *     |
  83  *     *- thresh_sel
  84  *
  85  * Below uses IBM bit numbering.
  86  *
  87  * MMCR1[x:y] = unit    (PMCxUNIT)
  88  * MMCR1[x]   = combine (PMCxCOMB)
  89  *
  90  * if pmc == 3 and unit == 0 and pmcxsel[0:6] == 0b0101011
  91  *      # PM_MRK_FAB_RSP_MATCH
  92  *      MMCR1[20:27] = thresh_ctl   (FAB_CRESP_MATCH / FAB_TYPE_MATCH)
  93  * else if pmc == 4 and unit == 0xf and pmcxsel[0:6] == 0b0101001
  94  *      # PM_MRK_FAB_RSP_MATCH_CYC
  95  *      MMCR1[20:27] = thresh_ctl   (FAB_CRESP_MATCH / FAB_TYPE_MATCH)
  96  * else
  97  *      MMCRA[48:55] = thresh_ctl   (THRESH START/END)
  98  *
  99  * if thresh_sel:
 100  *      MMCRA[45:47] = thresh_sel
 101  *
 102  * if thresh_cmp:
 103  *      MMCRA[22:24] = thresh_cmp[0:2]
 104  *      MMCRA[25:31] = thresh_cmp[3:9]
 105  *
 106  * if unit == 6 or unit == 7
 107  *      MMCRC[53:55] = cache_sel[1:3]      (L2EVENT_SEL)
 108  * else if unit == 8 or unit == 9:
 109  *      if cache_sel[0] == 0: # L3 bank
 110  *              MMCRC[47:49] = cache_sel[1:3]  (L3EVENT_SEL0)
 111  *      else if cache_sel[0] == 1:
 112  *              MMCRC[50:51] = cache_sel[2:3]  (L3EVENT_SEL1)
 113  * else if cache_sel[1]: # L1 event
 114  *      MMCR1[16] = cache_sel[2]
 115  *     MMCR1[17] = cache_sel[3]
 116  *
 117  * if mark:
 118  *      MMCRA[63]    = 1                (SAMPLE_ENABLE)
 119  *      MMCRA[57:59] = sample[0:2]      (RAND_SAMP_ELIG)
 120  *     MMCRA[61:62] = sample[3:4]      (RAND_SAMP_MODE)
 121  *
 122  * if EBB and BHRB:
 123  *      MMCRA[32:33] = IFM
 124  *
 125  */
 126
 127 #define EVENT_EBB_MASK          1ull
 128 #define EVENT_EBB_SHIFT         PERF_EVENT_CONFIG_EBB_SHIFT
 129 #define EVENT_BHRB_MASK         1ull
 130 #define EVENT_BHRB_SHIFT        62
 131 #define EVENT_WANTS_BHRB        (EVENT_BHRB_MASK << EVENT_BHRB_SHIFT)
 132 #define EVENT_IFM_MASK          3ull
 133 #define EVENT_IFM_SHIFT         60
 134 #define EVENT_THR_CMP_SHIFT     40      /* Threshold CMP value */
 135 #define EVENT_THR_CMP_MASK      0x3ff
 136 #define EVENT_THR_CTL_SHIFT     32      /* Threshold control value (start/stop) */
 137 #define EVENT_THR_CTL_MASK      0xffull
 138 #define EVENT_THR_SEL_SHIFT     29      /* Threshold select value */
 139 #define EVENT_THR_SEL_MASK      0x7
 140 #define EVENT_THRESH_SHIFT      29      /* All threshold bits */
 141 #define EVENT_THRESH_MASK       0x1fffffull
 142 #define EVENT_SAMPLE_SHIFT      24      /* Sampling mode & eligibility */
 143 #define EVENT_SAMPLE_MASK       0x1f
 144 #define EVENT_CACHE_SEL_SHIFT   20      /* L2/L3 cache select */
 145 #define EVENT_CACHE_SEL_MASK    0xf
 146 #define EVENT_IS_L1             (4 << EVENT_CACHE_SEL_SHIFT)
 147 #define EVENT_PMC_SHIFT         16      /* PMC number (1-based) */
 148 #define EVENT_PMC_MASK          0xf
 149 #define EVENT_UNIT_SHIFT        12      /* Unit */
 150 #define EVENT_UNIT_MASK         0xf
 151 #define EVENT_COMBINE_SHIFT     11      /* Combine bit */
 152 #define EVENT_COMBINE_MASK      0x1
 153 #define EVENT_MARKED_SHIFT      8       /* Marked bit */
 154 #define EVENT_MARKED_MASK       0x1
 155 #define EVENT_IS_MARKED         (EVENT_MARKED_MASK << EVENT_MARKED_SHIFT)
 156 #define EVENT_PSEL_MASK         0xff    /* PMCxSEL value */
 157
 158 /* Bits defined by Linux */
 159 #define EVENT_LINUX_MASK        \
 160         ((EVENT_EBB_MASK  << EVENT_EBB_SHIFT)                   |       \
 161          (EVENT_BHRB_MASK << EVENT_BHRB_SHIFT)                  |       \
 162          (EVENT_IFM_MASK  << EVENT_IFM_SHIFT))
 163
 164 #define EVENT_VALID_MASK        \
 165         ((EVENT_THRESH_MASK    << EVENT_THRESH_SHIFT)           |       \
 166          (EVENT_SAMPLE_MASK    << EVENT_SAMPLE_SHIFT)           |       \
 167          (EVENT_CACHE_SEL_MASK << EVENT_CACHE_SEL_SHIFT)        |       \
 168          (EVENT_PMC_MASK       << EVENT_PMC_SHIFT)              |       \
 169          (EVENT_UNIT_MASK      << EVENT_UNIT_SHIFT)             |       \
 170          (EVENT_COMBINE_MASK   << EVENT_COMBINE_SHIFT)          |       \
 171          (EVENT_MARKED_MASK    << EVENT_MARKED_SHIFT)           |       \
 172           EVENT_LINUX_MASK                                      |       \
 173           EVENT_PSEL_MASK)
 174
 175 /* MMCRA IFM bits - POWER8 */
 176 #define POWER8_MMCRA_IFM1               0x0000000040000000UL
 177 #define POWER8_MMCRA_IFM2               0x0000000080000000UL
 178 #define POWER8_MMCRA_IFM3               0x00000000C0000000UL
 179
 180 #define ONLY_PLM \
 181         (PERF_SAMPLE_BRANCH_USER        |\
 182          PERF_SAMPLE_BRANCH_KERNEL      |\
 183          PERF_SAMPLE_BRANCH_HV)
 184
 185 /*
 186  * Layout of constraint bits:
 187  *
 188  *        60        56        52        48        44        40        36        32
 189  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
 190  *   [   fab_match   ]         [       thresh_cmp      ] [   thresh_ctl    ] [   ]
 191  *                                                                             |
 192  *                                                                 thresh_sel -*
 193  *
 194  *        28        24        20        16        12         8         4         0
 195  * | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
 196  *               [ ] |   [ ]   [  sample ]   [     ]   [6] [5]   [4] [3]   [2] [1]
 197  *                |  |    |                     |
 198  *      BHRB IFM -*  |    |                     |      Count of events for each PMC.
 199  *              EBB -*    |                     |        p1, p2, p3, p4, p5, p6.
 200  *      L1 I/D qualifier -*                     |
 201  *                     nc - number of counters -*
 202  *
 203  * The PMC fields P1..P6, and NC, are adder fields. As we accumulate constraints
 204  * we want the low bit of each field to be added to any existing value.
 205  *
 206  * Everything else is a value field.
 207  */
 208
 209 #define CNST_FAB_MATCH_VAL(v)   (((v) & EVENT_THR_CTL_MASK) << 56)
 210 #define CNST_FAB_MATCH_MASK     CNST_FAB_MATCH_VAL(EVENT_THR_CTL_MASK)
 211
 212 /* We just throw all the threshold bits into the constraint */
 213 #define CNST_THRESH_VAL(v)      (((v) & EVENT_THRESH_MASK) << 32)
 214 #define CNST_THRESH_MASK        CNST_THRESH_VAL(EVENT_THRESH_MASK)
 215
 216 #define CNST_EBB_VAL(v)         (((v) & EVENT_EBB_MASK) << 24)
 217 #define CNST_EBB_MASK           CNST_EBB_VAL(EVENT_EBB_MASK)
 218
 219 #define CNST_IFM_VAL(v)         (((v) & EVENT_IFM_MASK) << 25)
 220 #define CNST_IFM_MASK           CNST_IFM_VAL(EVENT_IFM_MASK)
 221
 222 #define CNST_L1_QUAL_VAL(v)     (((v) & 3) << 22)
 223 #define CNST_L1_QUAL_MASK       CNST_L1_QUAL_VAL(3)
 224
 225 #define CNST_SAMPLE_VAL(v)      (((v) & EVENT_SAMPLE_MASK) << 16)
 226 #define CNST_SAMPLE_MASK        CNST_SAMPLE_VAL(EVENT_SAMPLE_MASK)
 227
 228 /*
 229  * For NC we are counting up to 4 events. This requires three bits, and we need
 230  * the fifth event to overflow and set the 4th bit. To achieve that we bias the
 231  * fields by 3 in test_adder.
 232  */
 233 #define CNST_NC_SHIFT           12
 234 #define CNST_NC_VAL             (1 << CNST_NC_SHIFT)
 235 #define CNST_NC_MASK            (8 << CNST_NC_SHIFT)
 236 #define POWER8_TEST_ADDER       (3 << CNST_NC_SHIFT)
 237
 238 /*
 239  * For the per-PMC fields we have two bits. The low bit is added, so if two
 240  * events ask for the same PMC the sum will overflow, setting the high bit,
 241  * indicating an error. So our mask sets the high bit.
 242  */
 243 #define CNST_PMC_SHIFT(pmc)     ((pmc - 1) * 2)
 244 #define CNST_PMC_VAL(pmc)       (1 << CNST_PMC_SHIFT(pmc))
 245 #define CNST_PMC_MASK(pmc)      (2 << CNST_PMC_SHIFT(pmc))
 246
 247 /* Our add_fields is defined as: */
 248 #define POWER8_ADD_FIELDS       \
 249         CNST_PMC_VAL(1) | CNST_PMC_VAL(2) | CNST_PMC_VAL(3) | \
 250         CNST_PMC_VAL(4) | CNST_PMC_VAL(5) | CNST_PMC_VAL(6) | CNST_NC_VAL
 251
 252
 253 /* Bits in MMCR1 for POWER8 */
 254 #define MMCR1_UNIT_SHIFT(pmc)           (60 - (4 * ((pmc) - 1)))
 255 #define MMCR1_COMBINE_SHIFT(pmc)        (35 - ((pmc) - 1))
 256 #define MMCR1_PMCSEL_SHIFT(pmc)         (24 - (((pmc) - 1)) * 8)
 257 #define MMCR1_FAB_SHIFT                 36
 258 #define MMCR1_DC_QUAL_SHIFT             47
 259 #define MMCR1_IC_QUAL_SHIFT             46
 260
 261 /* Bits in MMCRA for POWER8 */
 262 #define MMCRA_SAMP_MODE_SHIFT           1
 263 #define MMCRA_SAMP_ELIG_SHIFT           4
 264 #define MMCRA_THR_CTL_SHIFT             8
 265 #define MMCRA_THR_SEL_SHIFT             16
 266 #define MMCRA_THR_CMP_SHIFT             32
 267 #define MMCRA_SDAR_MODE_TLB             (1ull << 42)
 268 #define MMCRA_IFM_SHIFT                 30
 269
 270 /* Bits in MMCR2 for POWER8 */
 271 #define MMCR2_FCS(pmc)                  (1ull << (63 - (((pmc) - 1) * 9)))
 272 #define MMCR2_FCP(pmc)                  (1ull << (62 - (((pmc) - 1) * 9)))
 273 #define MMCR2_FCH(pmc)                  (1ull << (57 - (((pmc) - 1) * 9)))
 274
 275
 276 static inline bool event_is_fab_match(u64 event)
 277 {
 278         /* Only check pmc, unit and pmcxsel, ignore the edge bit (0) */
 279         event &= 0xff0fe;
 280
 281         /* PM_MRK_FAB_RSP_MATCH & PM_MRK_FAB_RSP_MATCH_CYC */
 282         return (event == 0x30056 || event == 0x4f052);
 283 }
 284
 285 static int power8_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp)
 286 {
 287         unsigned int unit, pmc, cache, ebb;
 288         unsigned long mask, value;
 289
 290         mask = value = 0;
 291
 292         if (event & ~EVENT_VALID_MASK)
 293                 return -1;
 294
 295         pmc   = (event >> EVENT_PMC_SHIFT)        & EVENT_PMC_MASK;
 296         unit  = (event >> EVENT_UNIT_SHIFT)       & EVENT_UNIT_MASK;
 297         cache = (event >> EVENT_CACHE_SEL_SHIFT)  & EVENT_CACHE_SEL_MASK;
 298         ebb   = (event >> EVENT_EBB_SHIFT)        & EVENT_EBB_MASK;
 299
 300         if (pmc) {
 301                 u64 base_event;
 302
 303                 if (pmc > 6)
 304                         return -1;
 305
 306                 /* Ignore Linux defined bits when checking event below */
 307                 base_event = event & ~EVENT_LINUX_MASK;
 308
 309                 if (pmc >= 5 && base_event != 0x500fa && base_event != 0x600f4)
 310                         return -1;
 311
 312                 mask  |= CNST_PMC_MASK(pmc);
 313                 value |= CNST_PMC_VAL(pmc);
 314         }
 315
 316         if (pmc <= 4) {
 317                 /*
 318                  * Add to number of counters in use. Note this includes events with
 319                  * a PMC of 0 - they still need a PMC, it's just assigned later.
 320                  * Don't count events on PMC 5 & 6, there is only one valid event
 321                  * on each of those counters, and they are handled above.
 322                  */
 323                 mask  |= CNST_NC_MASK;
 324                 value |= CNST_NC_VAL;
 325         }
 326
 327         if (unit >= 6 && unit <= 9) {
 328                 /*
 329                  * L2/L3 events contain a cache selector field, which is
 330                  * supposed to be programmed into MMCRC. However MMCRC is only
 331                  * HV writable, and there is no API for guest kernels to modify
 332                  * it. The solution is for the hypervisor to initialise the
 333                  * field to zeroes, and for us to only ever allow events that
 334                  * have a cache selector of zero. The bank selector (bit 3) is
 335                  * irrelevant, as long as the rest of the value is 0.
 336                  */
 337                 if (cache & 0x7)
 338                         return -1;
 339
 340         } else if (event & EVENT_IS_L1) {
 341                 mask  |= CNST_L1_QUAL_MASK;
 342                 value |= CNST_L1_QUAL_VAL(cache);
 343         }
 344
 345         if (event & EVENT_IS_MARKED) {
 346                 mask  |= CNST_SAMPLE_MASK;
 347                 value |= CNST_SAMPLE_VAL(event >> EVENT_SAMPLE_SHIFT);
 348         }
 349
 350         /*
 351          * Special case for PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC,
 352          * the threshold control bits are used for the match value.
 353          */
 354         if (event_is_fab_match(event)) {
 355                 mask  |= CNST_FAB_MATCH_MASK;
 356                 value |= CNST_FAB_MATCH_VAL(event >> EVENT_THR_CTL_SHIFT);
 357         } else {
 358                 /*
 359                  * Check the mantissa upper two bits are not zero, unless the
 360                  * exponent is also zero. See the THRESH_CMP_MANTISSA doc.
 361                  */
 362                 unsigned int cmp, exp;
 363
 364                 cmp = (event >> EVENT_THR_CMP_SHIFT) & EVENT_THR_CMP_MASK;
 365                 exp = cmp >> 7;
 366
 367                 if (exp && (cmp & 0x60) == 0)
 368                         return -1;
 369
 370                 mask  |= CNST_THRESH_MASK;
 371                 value |= CNST_THRESH_VAL(event >> EVENT_THRESH_SHIFT);
 372         }
 373
 374         if (!pmc && ebb)
 375                 /* EBB events must specify the PMC */
 376                 return -1;
 377
 378         if (event & EVENT_WANTS_BHRB) {
 379                 if (!ebb)
 380                         /* Only EBB events can request BHRB */
 381                         return -1;
 382
 383                 mask  |= CNST_IFM_MASK;
 384                 value |= CNST_IFM_VAL(event >> EVENT_IFM_SHIFT);
 385         }
 386
 387         /*
 388          * All events must agree on EBB, either all request it or none.
 389          * EBB events are pinned & exclusive, so this should never actually
 390          * hit, but we leave it as a fallback in case.
 391          */
 392         mask  |= CNST_EBB_VAL(ebb);
 393         value |= CNST_EBB_MASK;
 394
 395         *maskp = mask;
 396         *valp = value;
 397
 398         return 0;
 399 }
 400
 401 static int power8_compute_mmcr(u64 event[], int n_ev,
 402                                unsigned int hwc[], unsigned long mmcr[],
 403                                struct perf_event *pevents[])
 404 {
 405         unsigned long mmcra, mmcr1, mmcr2, unit, combine, psel, cache, val;
 406         unsigned int pmc, pmc_inuse;
 407         int i;
 408
 409         pmc_inuse = 0;
 410
 411         /* First pass to count resource use */
 412         for (i = 0; i < n_ev; ++i) {
 413                 pmc = (event[i] >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
 414                 if (pmc)
 415                         pmc_inuse |= 1 << pmc;
 416         }
 417
 418         /* In continous sampling mode, update SDAR on TLB miss */
 419         mmcra = MMCRA_SDAR_MODE_TLB;
 420         mmcr1 = mmcr2 = 0;
 421
 422         /* Second pass: assign PMCs, set all MMCR1 fields */
 423         for (i = 0; i < n_ev; ++i) {
 424                 pmc     = (event[i] >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
 425                 unit    = (event[i] >> EVENT_UNIT_SHIFT) & EVENT_UNIT_MASK;
 426                 combine = (event[i] >> EVENT_COMBINE_SHIFT) & EVENT_COMBINE_MASK;
 427                 psel    =  event[i] & EVENT_PSEL_MASK;
 428
 429                 if (!pmc) {
 430                         for (pmc = 1; pmc <= 4; ++pmc) {
 431                                 if (!(pmc_inuse & (1 << pmc)))
 432                                         break;
 433                         }
 434
 435                         pmc_inuse |= 1 << pmc;
 436                 }
 437
 438                 if (pmc <= 4) {
 439                         mmcr1 |= unit << MMCR1_UNIT_SHIFT(pmc);
 440                         mmcr1 |= combine << MMCR1_COMBINE_SHIFT(pmc);
 441                         mmcr1 |= psel << MMCR1_PMCSEL_SHIFT(pmc);
 442                 }
 443
 444                 if (event[i] & EVENT_IS_L1) {
 445                         cache = event[i] >> EVENT_CACHE_SEL_SHIFT;
 446                         mmcr1 |= (cache & 1) << MMCR1_IC_QUAL_SHIFT;
 447                         cache >>= 1;
 448                         mmcr1 |= (cache & 1) << MMCR1_DC_QUAL_SHIFT;
 449                 }
 450
 451                 if (event[i] & EVENT_IS_MARKED) {
 452                         mmcra |= MMCRA_SAMPLE_ENABLE;
 453
 454                         val = (event[i] >> EVENT_SAMPLE_SHIFT) & EVENT_SAMPLE_MASK;
 455                         if (val) {
 456                                 mmcra |= (val &  3) << MMCRA_SAMP_MODE_SHIFT;
 457                                 mmcra |= (val >> 2) << MMCRA_SAMP_ELIG_SHIFT;
 458                         }
 459                 }
 460
 461                 /*
 462                  * PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC,
 463                  * the threshold bits are used for the match value.
 464                  */
 465                 if (event_is_fab_match(event[i])) {
 466                         mmcr1 |= ((event[i] >> EVENT_THR_CTL_SHIFT) &
 467                                   EVENT_THR_CTL_MASK) << MMCR1_FAB_SHIFT;
 468                 } else {
 469                         val = (event[i] >> EVENT_THR_CTL_SHIFT) & EVENT_THR_CTL_MASK;
 470                         mmcra |= val << MMCRA_THR_CTL_SHIFT;
 471                         val = (event[i] >> EVENT_THR_SEL_SHIFT) & EVENT_THR_SEL_MASK;
 472                         mmcra |= val << MMCRA_THR_SEL_SHIFT;
 473                         val = (event[i] >> EVENT_THR_CMP_SHIFT) & EVENT_THR_CMP_MASK;
 474                         mmcra |= val << MMCRA_THR_CMP_SHIFT;
 475                 }
 476
 477                 if (event[i] & EVENT_WANTS_BHRB) {
 478                         val = (event[i] >> EVENT_IFM_SHIFT) & EVENT_IFM_MASK;
 479                         mmcra |= val << MMCRA_IFM_SHIFT;
 480                 }
 481
 482                 if (pevents[i]->attr.exclude_user)
 483                         mmcr2 |= MMCR2_FCP(pmc);
 484
 485                 if (pevents[i]->attr.exclude_hv)
 486                         mmcr2 |= MMCR2_FCH(pmc);
 487
 488                 if (pevents[i]->attr.exclude_kernel) {
 489                         if (cpu_has_feature(CPU_FTR_HVMODE))
 490                                 mmcr2 |= MMCR2_FCH(pmc);
 491                         else
 492                                 mmcr2 |= MMCR2_FCS(pmc);
 493                 }
 494
 495                 hwc[i] = pmc - 1;
 496         }
 497
 498         /* Return MMCRx values */
 499         mmcr[0] = 0;
 500
 501         /* pmc_inuse is 1-based */
 502         if (pmc_inuse & 2)
 503                 mmcr[0] = MMCR0_PMC1CE;
 504
 505         if (pmc_inuse & 0x7c)
 506                 mmcr[0] |= MMCR0_PMCjCE;
 507
 508         /* If we're not using PMC 5 or 6, freeze them */
 509         if (!(pmc_inuse & 0x60))
 510                 mmcr[0] |= MMCR0_FC56;
 511
 512         mmcr[1] = mmcr1;
 513         mmcr[2] = mmcra;
 514         mmcr[3] = mmcr2;
 515
 516         return 0;
 517 }
 518
 519 #define MAX_ALT 2
 520
 521 /* Table of alternatives, sorted by column 0 */
 522 static const unsigned int event_alternatives[][MAX_ALT] = {
 523         { 0x10134, 0x301e2 },           /* PM_MRK_ST_CMPL */
 524         { 0x10138, 0x40138 },           /* PM_BR_MRK_2PATH */
 525         { 0x18082, 0x3e05e },           /* PM_L3_CO_MEPF */
 526         { 0x1d14e, 0x401e8 },           /* PM_MRK_DATA_FROM_L2MISS */
 527         { 0x1e054, 0x4000a },           /* PM_CMPLU_STALL */
 528         { 0x20036, 0x40036 },           /* PM_BR_2PATH */
 529         { 0x200f2, 0x300f2 },           /* PM_INST_DISP */
 530         { 0x200f4, 0x600f4 },           /* PM_RUN_CYC */
 531         { 0x2013c, 0x3012e },           /* PM_MRK_FILT_MATCH */
 532         { 0x3e054, 0x400f0 },           /* PM_LD_MISS_L1 */
 533         { 0x400fa, 0x500fa },           /* PM_RUN_INST_CMPL */
 534 };
 535
 536 /*
 537  * Scan the alternatives table for a match and return the
 538  * index into the alternatives table if found, else -1.
 539  */
 540 static int find_alternative(u64 event)
 541 {
 542         int i, j;
 543
 544         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 545                 if (event < event_alternatives[i][0])
 546                         break;
 547
 548                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 549                         if (event == event_alternatives[i][j])
 550                                 return i;
 551         }
 552
 553         return -1;
 554 }
 555
 556 static int power8_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 557 {
 558         int i, j, num_alt = 0;
 559         u64 alt_event;
 560
 561         alt[num_alt++] = event;
 562
 563         i = find_alternative(event);
 564         if (i >= 0) {
 565                 /* Filter out the original event, it's already in alt[0] */
 566                 for (j = 0; j < MAX_ALT; ++j) {
 567                         alt_event = event_alternatives[i][j];
 568                         if (alt_event && alt_event != event)
 569                                 alt[num_alt++] = alt_event;
 570                 }
 571         }
 572
 573         if (flags & PPMU_ONLY_COUNT_RUN) {
 574                 /*
 575                  * We're only counting in RUN state, so PM_CYC is equivalent to
 576                  * PM_RUN_CYC and PM_INST_CMPL === PM_RUN_INST_CMPL.
 577                  */
 578                 j = num_alt;
 579                 for (i = 0; i < num_alt; ++i) {
 580                         switch (alt[i]) {
 581                         case 0x1e:      /* PM_CYC */
 582                                 alt[j++] = 0x600f4;     /* PM_RUN_CYC */
 583                                 break;
 584                         case 0x600f4:   /* PM_RUN_CYC */
 585                                 alt[j++] = 0x1e;
 586                                 break;
 587                         case 0x2:       /* PM_PPC_CMPL */
 588                                 alt[j++] = 0x500fa;     /* PM_RUN_INST_CMPL */
 589                                 break;
 590                         case 0x500fa:   /* PM_RUN_INST_CMPL */
 591                                 alt[j++] = 0x2; /* PM_PPC_CMPL */
 592                                 break;
 593                         }
 594                 }
 595                 num_alt = j;
 596         }
 597
 598         return num_alt;
 599 }
 600
 601 static void power8_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 602 {
 603         if (pmc <= 3)
 604                 mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SHIFT(pmc + 1));
 605 }
 606
 607 PMU_FORMAT_ATTR(event,          "config:0-49");
 608 PMU_FORMAT_ATTR(pmcxsel,        "config:0-7");
 609 PMU_FORMAT_ATTR(mark,           "config:8");
 610 PMU_FORMAT_ATTR(combine,        "config:11");
 611 PMU_FORMAT_ATTR(unit,           "config:12-15");
 612 PMU_FORMAT_ATTR(pmc,            "config:16-19");
 613 PMU_FORMAT_ATTR(cache_sel,      "config:20-23");
 614 PMU_FORMAT_ATTR(sample_mode,    "config:24-28");
 615 PMU_FORMAT_ATTR(thresh_sel,     "config:29-31");
 616 PMU_FORMAT_ATTR(thresh_stop,    "config:32-35");
 617 PMU_FORMAT_ATTR(thresh_start,   "config:36-39");
 618 PMU_FORMAT_ATTR(thresh_cmp,     "config:40-49");
 619
 620 static struct attribute *power8_pmu_format_attr[] = {
 621         &format_attr_event.attr,
 622         &format_attr_pmcxsel.attr,
 623         &format_attr_mark.attr,
 624         &format_attr_combine.attr,
 625         &format_attr_unit.attr,
 626         &format_attr_pmc.attr,
 627         &format_attr_cache_sel.attr,
 628         &format_attr_sample_mode.attr,
 629         &format_attr_thresh_sel.attr,
 630         &format_attr_thresh_stop.attr,
 631         &format_attr_thresh_start.attr,
 632         &format_attr_thresh_cmp.attr,
 633         NULL,
 634 };
 635
 636 struct attribute_group power8_pmu_format_group = {
 637         .name = "format",
 638         .attrs = power8_pmu_format_attr,
 639 };
 640
 641 static const struct attribute_group *power8_pmu_attr_groups[] = {
 642         &power8_pmu_format_group,
 643         NULL,
 644 };
 645
 646 static int power8_generic_events[] = {
 647         [PERF_COUNT_HW_CPU_CYCLES] =                    PM_CYC,
 648         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =       PM_GCT_NOSLOT_CYC,
 649         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =        PM_CMPLU_STALL,
 650         [PERF_COUNT_HW_INSTRUCTIONS] =                  PM_INST_CMPL,
 651         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =           PM_BRU_FIN,
 652         [PERF_COUNT_HW_BRANCH_MISSES] =                 PM_BR_MPRED_CMPL,
 653         [PERF_COUNT_HW_CACHE_REFERENCES] =              PM_LD_REF_L1,
 654         [PERF_COUNT_HW_CACHE_MISSES] =                  PM_LD_MISS_L1,
 655 };
 656
 657 static u64 power8_bhrb_filter_map(u64 branch_sample_type)
 658 {
 659         u64 pmu_bhrb_filter = 0;
 660
 661         /* BHRB and regular PMU events share the same privilege state
 662          * filter configuration. BHRB is always recorded along with a
 663          * regular PMU event. As the privilege state filter is handled
 664          * in the basic PMC configuration of the accompanying regular
 665          * PMU event, we ignore any separate BHRB specific request.
 666          */
 667
 668         /* No branch filter requested */
 669         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
 670                 return pmu_bhrb_filter;
 671
 672         /* Invalid branch filter options - HW does not support */
 673         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
 674                 return -1;
 675
 676         if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL)
 677                 return -1;
 678
 679         if (branch_sample_type & PERF_SAMPLE_BRANCH_CALL)
 680                 return -1;
 681
 682         if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
 683                 pmu_bhrb_filter |= POWER8_MMCRA_IFM1;
 684                 return pmu_bhrb_filter;
 685         }
 686
 687         /* Every thing else is unsupported */
 688         return -1;
 689 }
 690
 691 static void power8_config_bhrb(u64 pmu_bhrb_filter)
 692 {
 693         /* Enable BHRB filter in PMU */
 694         mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
 695 }
 696
 697 #define C(x)    PERF_COUNT_HW_CACHE_##x
 698
 699 /*
 700  * Table of generalized cache-related events.
 701  * 0 means not supported, -1 means nonsensical, other values
 702  * are event codes.
 703  */
 704 static int power8_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 705         [ C(L1D) ] = {
 706                 [ C(OP_READ) ] = {
 707                         [ C(RESULT_ACCESS) ] = PM_LD_REF_L1,
 708                         [ C(RESULT_MISS)   ] = PM_LD_MISS_L1,
 709                 },
 710                 [ C(OP_WRITE) ] = {
 711                         [ C(RESULT_ACCESS) ] = 0,
 712                         [ C(RESULT_MISS)   ] = PM_ST_MISS_L1,
 713                 },
 714                 [ C(OP_PREFETCH) ] = {
 715                         [ C(RESULT_ACCESS) ] = PM_L1_PREF,
 716                         [ C(RESULT_MISS)   ] = 0,
 717                 },
 718         },
 719         [ C(L1I) ] = {
 720                 [ C(OP_READ) ] = {
 721                         [ C(RESULT_ACCESS) ] = PM_INST_FROM_L1,
 722                         [ C(RESULT_MISS)   ] = PM_L1_ICACHE_MISS,
 723                 },
 724                 [ C(OP_WRITE) ] = {
 725                         [ C(RESULT_ACCESS) ] = PM_L1_DEMAND_WRITE,
 726                         [ C(RESULT_MISS)   ] = -1,
 727                 },
 728                 [ C(OP_PREFETCH) ] = {
 729                         [ C(RESULT_ACCESS) ] = PM_IC_PREF_WRITE,
 730                         [ C(RESULT_MISS)   ] = 0,
 731                 },
 732         },
 733         [ C(LL) ] = {
 734                 [ C(OP_READ) ] = {
 735                         [ C(RESULT_ACCESS) ] = PM_DATA_FROM_L3,
 736                         [ C(RESULT_MISS)   ] = PM_DATA_FROM_L3MISS,
 737                 },
 738                 [ C(OP_WRITE) ] = {
 739                         [ C(RESULT_ACCESS) ] = PM_L2_ST,
 740                         [ C(RESULT_MISS)   ] = PM_L2_ST_MISS,
 741                 },
 742                 [ C(OP_PREFETCH) ] = {
 743                         [ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
 744                         [ C(RESULT_MISS)   ] = 0,
 745                 },
 746         },
 747         [ C(DTLB) ] = {
 748                 [ C(OP_READ) ] = {
 749                         [ C(RESULT_ACCESS) ] = 0,
 750                         [ C(RESULT_MISS)   ] = PM_DTLB_MISS,
 751                 },
 752                 [ C(OP_WRITE) ] = {
 753                         [ C(RESULT_ACCESS) ] = -1,
 754                         [ C(RESULT_MISS)   ] = -1,
 755                 },
 756                 [ C(OP_PREFETCH) ] = {
 757                         [ C(RESULT_ACCESS) ] = -1,
 758                         [ C(RESULT_MISS)   ] = -1,
 759                 },
 760         },
 761         [ C(ITLB) ] = {
 762                 [ C(OP_READ) ] = {
 763                         [ C(RESULT_ACCESS) ] = 0,
 764                         [ C(RESULT_MISS)   ] = PM_ITLB_MISS,
 765                 },
 766                 [ C(OP_WRITE) ] = {
 767                         [ C(RESULT_ACCESS) ] = -1,
 768                         [ C(RESULT_MISS)   ] = -1,
 769                 },
 770                 [ C(OP_PREFETCH) ] = {
 771                         [ C(RESULT_ACCESS) ] = -1,
 772                         [ C(RESULT_MISS)   ] = -1,
 773                 },
 774         },
 775         [ C(BPU) ] = {
 776                 [ C(OP_READ) ] = {
 777                         [ C(RESULT_ACCESS) ] = PM_BRU_FIN,
 778                         [ C(RESULT_MISS)   ] = PM_BR_MPRED_CMPL,
 779                 },
 780                 [ C(OP_WRITE) ] = {
 781                         [ C(RESULT_ACCESS) ] = -1,
 782                         [ C(RESULT_MISS)   ] = -1,
 783                 },
 784                 [ C(OP_PREFETCH) ] = {
 785                         [ C(RESULT_ACCESS) ] = -1,
 786                         [ C(RESULT_MISS)   ] = -1,
 787                 },
 788         },
 789         [ C(NODE) ] = {
 790                 [ C(OP_READ) ] = {
 791                         [ C(RESULT_ACCESS) ] = -1,
 792                         [ C(RESULT_MISS)   ] = -1,
 793                 },
 794                 [ C(OP_WRITE) ] = {
 795                         [ C(RESULT_ACCESS) ] = -1,
 796                         [ C(RESULT_MISS)   ] = -1,
 797                 },
 798                 [ C(OP_PREFETCH) ] = {
 799                         [ C(RESULT_ACCESS) ] = -1,
 800                         [ C(RESULT_MISS)   ] = -1,
 801                 },
 802         },
 803 };
 804
 805 #undef C
 806
 807 static struct power_pmu power8_pmu = {
 808         .name                   = "POWER8",
 809         .n_counter              = 6,
 810         .max_alternatives       = MAX_ALT + 1,
 811         .add_fields             = POWER8_ADD_FIELDS,
 812         .test_adder             = POWER8_TEST_ADDER,
 813         .compute_mmcr           = power8_compute_mmcr,
 814         .config_bhrb            = power8_config_bhrb,
 815         .bhrb_filter_map        = power8_bhrb_filter_map,
 816         .get_constraint         = power8_get_constraint,
 817         .get_alternatives       = power8_get_alternatives,
 818         .disable_pmc            = power8_disable_pmc,
 819         .flags                  = PPMU_HAS_SSLOT | PPMU_HAS_SIER | PPMU_ARCH_207S,
 820         .n_generic              = ARRAY_SIZE(power8_generic_events),
 821         .generic_events         = power8_generic_events,
 822         .cache_events           = &power8_cache_events,
 823         .attr_groups            = power8_pmu_attr_groups,
 824         .bhrb_nr                = 32,
 825 };
 826
 827 static int __init init_power8_pmu(void)
 828 {
 829         int rc;
 830
 831         if (!cur_cpu_spec->oprofile_cpu_type ||
 832             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8"))
 833                 return -ENODEV;
 834
 835         rc = register_power_pmu(&power8_pmu);
 836         if (rc)
 837                 return rc;
 838
 839         /* Tell userspace that EBB is supported */
 840         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
 841
 842         if (cpu_has_feature(CPU_FTR_PMAO_BUG))
 843                 pr_info("PMAO restore workaround active.\n");
 844
 845         return 0;
 846 }
 847 early_initcall(init_power8_pmu);