arch/powerpc/kernel/power7-pmu.c

   1 /*
   2  * Performance counter support for POWER7 processors.
   3  *
   4  * Copyright 2009 Paul Mackerras, IBM Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/perf_event.h>
  13 #include <linux/string.h>
  14 #include <asm/reg.h>
  15 #include <asm/cputable.h>
  16
  17 /*
  18  * Bits in event code for POWER7
  19  */
  20 #define PM_PMC_SH       16      /* PMC number (1-based) for direct events */
  21 #define PM_PMC_MSK      0xf
  22 #define PM_PMC_MSKS     (PM_PMC_MSK << PM_PMC_SH)
  23 #define PM_UNIT_SH      12      /* TTMMUX number and setting - unit select */
  24 #define PM_UNIT_MSK     0xf
  25 #define PM_COMBINE_SH   11      /* Combined event bit */
  26 #define PM_COMBINE_MSK  1
  27 #define PM_COMBINE_MSKS 0x800
  28 #define PM_L2SEL_SH     8       /* L2 event select */
  29 #define PM_L2SEL_MSK    7
  30 #define PM_PMCSEL_MSK   0xff
  31
  32 /*
  33  * Bits in MMCR1 for POWER7
  34  */
  35 #define MMCR1_TTM0SEL_SH        60
  36 #define MMCR1_TTM1SEL_SH        56
  37 #define MMCR1_TTM2SEL_SH        52
  38 #define MMCR1_TTM3SEL_SH        48
  39 #define MMCR1_TTMSEL_MSK        0xf
  40 #define MMCR1_L2SEL_SH          45
  41 #define MMCR1_L2SEL_MSK         7
  42 #define MMCR1_PMC1_COMBINE_SH   35
  43 #define MMCR1_PMC2_COMBINE_SH   34
  44 #define MMCR1_PMC3_COMBINE_SH   33
  45 #define MMCR1_PMC4_COMBINE_SH   32
  46 #define MMCR1_PMC1SEL_SH        24
  47 #define MMCR1_PMC2SEL_SH        16
  48 #define MMCR1_PMC3SEL_SH        8
  49 #define MMCR1_PMC4SEL_SH        0
  50 #define MMCR1_PMCSEL_SH(n)      (MMCR1_PMC1SEL_SH - (n) * 8)
  51 #define MMCR1_PMCSEL_MSK        0xff
  52
  53 /*
  54  * Layout of constraint bits:
  55  * 6666555555555544444444443333333333222222222211111111110000000000
  56  * 3210987654321098765432109876543210987654321098765432109876543210
  57  *                                                 [  ><><><><><><>
  58  *                                                  NC P6P5P4P3P2P1
  59  *
  60  * NC - number of counters
  61  *     15: NC error 0x8000
  62  *     12-14: number of events needing PMC1-4 0x7000
  63  *
  64  * P6
  65  *     11: P6 error 0x800
  66  *     10-11: Count of events needing PMC6
  67  *
  68  * P1..P5
  69  *     0-9: Count of events needing PMC1..PMC5
  70  */
  71
  72 static int power7_get_constraint(u64 event, unsigned long *maskp,
  73                                  unsigned long *valp)
  74 {
  75         int pmc, sh;
  76         unsigned long mask = 0, value = 0;
  77
  78         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
  79         if (pmc) {
  80                 if (pmc > 6)
  81                         return -1;
  82                 sh = (pmc - 1) * 2;
  83                 mask |= 2 << sh;
  84                 value |= 1 << sh;
  85                 if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
  86                         return -1;
  87         }
  88         if (pmc < 5) {
  89                 /* need a counter from PMC1-4 set */
  90                 mask  |= 0x8000;
  91                 value |= 0x1000;
  92         }
  93         *maskp = mask;
  94         *valp = value;
  95         return 0;
  96 }
  97
  98 #define MAX_ALT 2       /* at most 2 alternatives for any event */
  99
 100 static const unsigned int event_alternatives[][MAX_ALT] = {
 101         { 0x200f2, 0x300f2 },           /* PM_INST_DISP */
 102         { 0x200f4, 0x600f4 },           /* PM_RUN_CYC */
 103         { 0x400fa, 0x500fa },           /* PM_RUN_INST_CMPL */
 104 };
 105
 106 /*
 107  * Scan the alternatives table for a match and return the
 108  * index into the alternatives table if found, else -1.
 109  */
 110 static int find_alternative(u64 event)
 111 {
 112         int i, j;
 113
 114         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 115                 if (event < event_alternatives[i][0])
 116                         break;
 117                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 118                         if (event == event_alternatives[i][j])
 119                                 return i;
 120         }
 121         return -1;
 122 }
 123
 124 static s64 find_alternative_decode(u64 event)
 125 {
 126         int pmc, psel;
 127
 128         /* this only handles the 4x decode events */
 129         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 130         psel = event & PM_PMCSEL_MSK;
 131         if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
 132                 return event - (1 << PM_PMC_SH) + 8;
 133         if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
 134                 return event + (1 << PM_PMC_SH) - 8;
 135         return -1;
 136 }
 137
 138 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 139 {
 140         int i, j, nalt = 1;
 141         s64 ae;
 142
 143         alt[0] = event;
 144         nalt = 1;
 145         i = find_alternative(event);
 146         if (i >= 0) {
 147                 for (j = 0; j < MAX_ALT; ++j) {
 148                         ae = event_alternatives[i][j];
 149                         if (ae && ae != event)
 150                                 alt[nalt++] = ae;
 151                 }
 152         } else {
 153                 ae = find_alternative_decode(event);
 154                 if (ae > 0)
 155                         alt[nalt++] = ae;
 156         }
 157
 158         if (flags & PPMU_ONLY_COUNT_RUN) {
 159                 /*
 160                  * We're only counting in RUN state,
 161                  * so PM_CYC is equivalent to PM_RUN_CYC
 162                  * and PM_INST_CMPL === PM_RUN_INST_CMPL.
 163                  * This doesn't include alternatives that don't provide
 164                  * any extra flexibility in assigning PMCs.
 165                  */
 166                 j = nalt;
 167                 for (i = 0; i < nalt; ++i) {
 168                         switch (alt[i]) {
 169                         case 0x1e:      /* PM_CYC */
 170                                 alt[j++] = 0x600f4;     /* PM_RUN_CYC */
 171                                 break;
 172                         case 0x600f4:   /* PM_RUN_CYC */
 173                                 alt[j++] = 0x1e;
 174                                 break;
 175                         case 0x2:       /* PM_PPC_CMPL */
 176                                 alt[j++] = 0x500fa;     /* PM_RUN_INST_CMPL */
 177                                 break;
 178                         case 0x500fa:   /* PM_RUN_INST_CMPL */
 179                                 alt[j++] = 0x2; /* PM_PPC_CMPL */
 180                                 break;
 181                         }
 182                 }
 183                 nalt = j;
 184         }
 185
 186         return nalt;
 187 }
 188
 189 /*
 190  * Returns 1 if event counts things relating to marked instructions
 191  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 192  */
 193 static int power7_marked_instr_event(u64 event)
 194 {
 195         int pmc, psel;
 196         int unit;
 197
 198         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 199         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 200         psel = event & PM_PMCSEL_MSK & ~1;      /* trim off edge/level bit */
 201         if (pmc >= 5)
 202                 return 0;
 203
 204         switch (psel >> 4) {
 205         case 2:
 206                 return pmc == 2 || pmc == 4;
 207         case 3:
 208                 if (psel == 0x3c)
 209                         return pmc == 1;
 210                 if (psel == 0x3e)
 211                         return pmc != 2;
 212                 return 1;
 213         case 4:
 214         case 5:
 215                 return unit == 0xd;
 216         case 6:
 217                 if (psel == 0x64)
 218                         return pmc >= 3;
 219         case 8:
 220                 return unit == 0xd;
 221         }
 222         return 0;
 223 }
 224
 225 static int power7_compute_mmcr(u64 event[], int n_ev,
 226                                unsigned int hwc[], unsigned long mmcr[])
 227 {
 228         unsigned long mmcr1 = 0;
 229         unsigned long mmcra = MMCRA_SDAR_DCACHE_MISS | MMCRA_SDAR_ERAT_MISS;
 230         unsigned int pmc, unit, combine, l2sel, psel;
 231         unsigned int pmc_inuse = 0;
 232         int i;
 233
 234         /* First pass to count resource use */
 235         for (i = 0; i < n_ev; ++i) {
 236                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 237                 if (pmc) {
 238                         if (pmc > 6)
 239                                 return -1;
 240                         if (pmc_inuse & (1 << (pmc - 1)))
 241                                 return -1;
 242                         pmc_inuse |= 1 << (pmc - 1);
 243                 }
 244         }
 245
 246         /* Second pass: assign PMCs, set all MMCR1 fields */
 247         for (i = 0; i < n_ev; ++i) {
 248                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 249                 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 250                 combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
 251                 l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 252                 psel = event[i] & PM_PMCSEL_MSK;
 253                 if (!pmc) {
 254                         /* Bus event or any-PMC direct event */
 255                         for (pmc = 0; pmc < 4; ++pmc) {
 256                                 if (!(pmc_inuse & (1 << pmc)))
 257                                         break;
 258                         }
 259                         if (pmc >= 4)
 260                                 return -1;
 261                         pmc_inuse |= 1 << pmc;
 262                 } else {
 263                         /* Direct or decoded event */
 264                         --pmc;
 265                 }
 266                 if (pmc <= 3) {
 267                         mmcr1 |= (unsigned long) unit
 268                                 << (MMCR1_TTM0SEL_SH - 4 * pmc);
 269                         mmcr1 |= (unsigned long) combine
 270                                 << (MMCR1_PMC1_COMBINE_SH - pmc);
 271                         mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc);
 272                         if (unit == 6)  /* L2 events */
 273                                 mmcr1 |= (unsigned long) l2sel
 274                                         << MMCR1_L2SEL_SH;
 275                 }
 276                 if (power7_marked_instr_event(event[i]))
 277                         mmcra |= MMCRA_SAMPLE_ENABLE;
 278                 hwc[i] = pmc;
 279         }
 280
 281         /* Return MMCRx values */
 282         mmcr[0] = 0;
 283         if (pmc_inuse & 1)
 284                 mmcr[0] = MMCR0_PMC1CE;
 285         if (pmc_inuse & 0x3e)
 286                 mmcr[0] |= MMCR0_PMCjCE;
 287         mmcr[1] = mmcr1;
 288         mmcr[2] = mmcra;
 289         return 0;
 290 }
 291
 292 static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 293 {
 294         if (pmc <= 3)
 295                 mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 296 }
 297
 298 static int power7_generic_events[] = {
 299         [PERF_COUNT_HW_CPU_CYCLES] = 0x1e,
 300         [PERF_COUNT_HW_INSTRUCTIONS] = 2,
 301         [PERF_COUNT_HW_CACHE_REFERENCES] = 0xc880,      /* LD_REF_L1_LSU*/
 302         [PERF_COUNT_HW_CACHE_MISSES] = 0x400f0,         /* LD_MISS_L1   */
 303         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x10068,  /* BRU_FIN      */
 304         [PERF_COUNT_HW_BRANCH_MISSES] = 0x400f6,        /* BR_MPRED     */
 305 };
 306
 307 #define C(x)    PERF_COUNT_HW_CACHE_##x
 308
 309 /*
 310  * Table of generalized cache-related events.
 311  * 0 means not supported, -1 means nonsensical, other values
 312  * are event codes.
 313  */
 314 static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 315         [C(L1D)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 316                 [C(OP_READ)] = {        0xc880,         0x400f0 },
 317                 [C(OP_WRITE)] = {       0,              0x300f0 },
 318                 [C(OP_PREFETCH)] = {    0xd8b8,         0       },
 319         },
 320         [C(L1I)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 321                 [C(OP_READ)] = {        0,              0x200fc },
 322                 [C(OP_WRITE)] = {       -1,             -1      },
 323                 [C(OP_PREFETCH)] = {    0x408a,         0       },
 324         },
 325         [C(LL)] = {             /*      RESULT_ACCESS   RESULT_MISS */
 326                 [C(OP_READ)] = {        0x16080,        0x26080 },
 327                 [C(OP_WRITE)] = {       0x16082,        0x26082 },
 328                 [C(OP_PREFETCH)] = {    0,              0       },
 329         },
 330         [C(DTLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 331                 [C(OP_READ)] = {        0,              0x300fc },
 332                 [C(OP_WRITE)] = {       -1,             -1      },
 333                 [C(OP_PREFETCH)] = {    -1,             -1      },
 334         },
 335         [C(ITLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 336                 [C(OP_READ)] = {        0,              0x400fc },
 337                 [C(OP_WRITE)] = {       -1,             -1      },
 338                 [C(OP_PREFETCH)] = {    -1,             -1      },
 339         },
 340         [C(BPU)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 341                 [C(OP_READ)] = {        0x10068,        0x400f6 },
 342                 [C(OP_WRITE)] = {       -1,             -1      },
 343                 [C(OP_PREFETCH)] = {    -1,             -1      },
 344         },
 345 };
 346
 347 static struct power_pmu power7_pmu = {
 348         .name                   = "POWER7",
 349         .n_counter              = 6,
 350         .max_alternatives       = MAX_ALT + 1,
 351         .add_fields             = 0x1555ul,
 352         .test_adder             = 0x3000ul,
 353         .compute_mmcr           = power7_compute_mmcr,
 354         .get_constraint         = power7_get_constraint,
 355         .get_alternatives       = power7_get_alternatives,
 356         .disable_pmc            = power7_disable_pmc,
 357         .flags                  = PPMU_ALT_SIPR,
 358         .n_generic              = ARRAY_SIZE(power7_generic_events),
 359         .generic_events         = power7_generic_events,
 360         .cache_events           = &power7_cache_events,
 361 };
 362
 363 static int init_power7_pmu(void)
 364 {
 365         if (!cur_cpu_spec->oprofile_cpu_type ||
 366             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
 367                 return -ENODEV;
 368
 369         return register_power_pmu(&power7_pmu);
 370 }
 371
 372 early_initcall(init_power7_pmu);