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  * Bits in MMCRA
  55  */
  56
  57 /*
  58  * Layout of constraint bits:
  59  * 6666555555555544444444443333333333222222222211111111110000000000
  60  * 3210987654321098765432109876543210987654321098765432109876543210
  61  *                                                 [  ><><><><><><>
  62  *                                                  NC P6P5P4P3P2P1
  63  *
  64  * NC - number of counters
  65  *     15: NC error 0x8000
  66  *     12-14: number of events needing PMC1-4 0x7000
  67  *
  68  * P6
  69  *     11: P6 error 0x800
  70  *     10-11: Count of events needing PMC6
  71  *
  72  * P1..P5
  73  *     0-9: Count of events needing PMC1..PMC5
  74  */
  75
  76 static int power7_get_constraint(u64 event, unsigned long *maskp,
  77                                  unsigned long *valp)
  78 {
  79         int pmc, sh;
  80         unsigned long mask = 0, value = 0;
  81
  82         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
  83         if (pmc) {
  84                 if (pmc > 6)
  85                         return -1;
  86                 sh = (pmc - 1) * 2;
  87                 mask |= 2 << sh;
  88                 value |= 1 << sh;
  89                 if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
  90                         return -1;
  91         }
  92         if (pmc < 5) {
  93                 /* need a counter from PMC1-4 set */
  94                 mask  |= 0x8000;
  95                 value |= 0x1000;
  96         }
  97         *maskp = mask;
  98         *valp = value;
  99         return 0;
 100 }
 101
 102 #define MAX_ALT 2       /* at most 2 alternatives for any event */
 103
 104 static const unsigned int event_alternatives[][MAX_ALT] = {
 105         { 0x200f2, 0x300f2 },           /* PM_INST_DISP */
 106         { 0x200f4, 0x600f4 },           /* PM_RUN_CYC */
 107         { 0x400fa, 0x500fa },           /* PM_RUN_INST_CMPL */
 108 };
 109
 110 /*
 111  * Scan the alternatives table for a match and return the
 112  * index into the alternatives table if found, else -1.
 113  */
 114 static int find_alternative(u64 event)
 115 {
 116         int i, j;
 117
 118         for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 119                 if (event < event_alternatives[i][0])
 120                         break;
 121                 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 122                         if (event == event_alternatives[i][j])
 123                                 return i;
 124         }
 125         return -1;
 126 }
 127
 128 static s64 find_alternative_decode(u64 event)
 129 {
 130         int pmc, psel;
 131
 132         /* this only handles the 4x decode events */
 133         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 134         psel = event & PM_PMCSEL_MSK;
 135         if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
 136                 return event - (1 << PM_PMC_SH) + 8;
 137         if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
 138                 return event + (1 << PM_PMC_SH) - 8;
 139         return -1;
 140 }
 141
 142 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 143 {
 144         int i, j, nalt = 1;
 145         s64 ae;
 146
 147         alt[0] = event;
 148         nalt = 1;
 149         i = find_alternative(event);
 150         if (i >= 0) {
 151                 for (j = 0; j < MAX_ALT; ++j) {
 152                         ae = event_alternatives[i][j];
 153                         if (ae && ae != event)
 154                                 alt[nalt++] = ae;
 155                 }
 156         } else {
 157                 ae = find_alternative_decode(event);
 158                 if (ae > 0)
 159                         alt[nalt++] = ae;
 160         }
 161
 162         if (flags & PPMU_ONLY_COUNT_RUN) {
 163                 /*
 164                  * We're only counting in RUN state,
 165                  * so PM_CYC is equivalent to PM_RUN_CYC
 166                  * and PM_INST_CMPL === PM_RUN_INST_CMPL.
 167                  * This doesn't include alternatives that don't provide
 168                  * any extra flexibility in assigning PMCs.
 169                  */
 170                 j = nalt;
 171                 for (i = 0; i < nalt; ++i) {
 172                         switch (alt[i]) {
 173                         case 0x1e:      /* PM_CYC */
 174                                 alt[j++] = 0x600f4;     /* PM_RUN_CYC */
 175                                 break;
 176                         case 0x600f4:   /* PM_RUN_CYC */
 177                                 alt[j++] = 0x1e;
 178                                 break;
 179                         case 0x2:       /* PM_PPC_CMPL */
 180                                 alt[j++] = 0x500fa;     /* PM_RUN_INST_CMPL */
 181                                 break;
 182                         case 0x500fa:   /* PM_RUN_INST_CMPL */
 183                                 alt[j++] = 0x2; /* PM_PPC_CMPL */
 184                                 break;
 185                         }
 186                 }
 187                 nalt = j;
 188         }
 189
 190         return nalt;
 191 }
 192
 193 /*
 194  * Returns 1 if event counts things relating to marked instructions
 195  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 196  */
 197 static int power7_marked_instr_event(u64 event)
 198 {
 199         int pmc, psel;
 200         int unit;
 201
 202         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 203         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 204         psel = event & PM_PMCSEL_MSK & ~1;      /* trim off edge/level bit */
 205         if (pmc >= 5)
 206                 return 0;
 207
 208         switch (psel >> 4) {
 209         case 2:
 210                 return pmc == 2 || pmc == 4;
 211         case 3:
 212                 if (psel == 0x3c)
 213                         return pmc == 1;
 214                 if (psel == 0x3e)
 215                         return pmc != 2;
 216                 return 1;
 217         case 4:
 218         case 5:
 219                 return unit == 0xd;
 220         case 6:
 221                 if (psel == 0x64)
 222                         return pmc >= 3;
 223         case 8:
 224                 return unit == 0xd;
 225         }
 226         return 0;
 227 }
 228
 229 static int power7_compute_mmcr(u64 event[], int n_ev,
 230                                unsigned int hwc[], unsigned long mmcr[])
 231 {
 232         unsigned long mmcr1 = 0;
 233         unsigned long mmcra = 0;
 234         unsigned int pmc, unit, combine, l2sel, psel;
 235         unsigned int pmc_inuse = 0;
 236         int i;
 237
 238         /* First pass to count resource use */
 239         for (i = 0; i < n_ev; ++i) {
 240                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 241                 if (pmc) {
 242                         if (pmc > 6)
 243                                 return -1;
 244                         if (pmc_inuse & (1 << (pmc - 1)))
 245                                 return -1;
 246                         pmc_inuse |= 1 << (pmc - 1);
 247                 }
 248         }
 249
 250         /* Second pass: assign PMCs, set all MMCR1 fields */
 251         for (i = 0; i < n_ev; ++i) {
 252                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 253                 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 254                 combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
 255                 l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 256                 psel = event[i] & PM_PMCSEL_MSK;
 257                 if (!pmc) {
 258                         /* Bus event or any-PMC direct event */
 259                         for (pmc = 0; pmc < 4; ++pmc) {
 260                                 if (!(pmc_inuse & (1 << pmc)))
 261                                         break;
 262                         }
 263                         if (pmc >= 4)
 264                                 return -1;
 265                         pmc_inuse |= 1 << pmc;
 266                 } else {
 267                         /* Direct or decoded event */
 268                         --pmc;
 269                 }
 270                 if (pmc <= 3) {
 271                         mmcr1 |= (unsigned long) unit
 272                                 << (MMCR1_TTM0SEL_SH - 4 * pmc);
 273                         mmcr1 |= (unsigned long) combine
 274                                 << (MMCR1_PMC1_COMBINE_SH - pmc);
 275                         mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc);
 276                         if (unit == 6)  /* L2 events */
 277                                 mmcr1 |= (unsigned long) l2sel
 278                                         << MMCR1_L2SEL_SH;
 279                 }
 280                 if (power7_marked_instr_event(event[i]))
 281                         mmcra |= MMCRA_SAMPLE_ENABLE;
 282                 hwc[i] = pmc;
 283         }
 284
 285         /* Return MMCRx values */
 286         mmcr[0] = 0;
 287         if (pmc_inuse & 1)
 288                 mmcr[0] = MMCR0_PMC1CE;
 289         if (pmc_inuse & 0x3e)
 290                 mmcr[0] |= MMCR0_PMCjCE;
 291         mmcr[1] = mmcr1;
 292         mmcr[2] = mmcra;
 293         return 0;
 294 }
 295
 296 static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 297 {
 298         if (pmc <= 3)
 299                 mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 300 }
 301
 302 static int power7_generic_events[] = {
 303         [PERF_COUNT_HW_CPU_CYCLES] = 0x1e,
 304         [PERF_COUNT_HW_INSTRUCTIONS] = 2,
 305         [PERF_COUNT_HW_CACHE_REFERENCES] = 0xc880,      /* LD_REF_L1_LSU*/
 306         [PERF_COUNT_HW_CACHE_MISSES] = 0x400f0,         /* LD_MISS_L1   */
 307         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x10068,  /* BRU_FIN      */
 308         [PERF_COUNT_HW_BRANCH_MISSES] = 0x400f6,        /* BR_MPRED     */
 309 };
 310
 311 #define C(x)    PERF_COUNT_HW_CACHE_##x
 312
 313 /*
 314  * Table of generalized cache-related events.
 315  * 0 means not supported, -1 means nonsensical, other values
 316  * are event codes.
 317  */
 318 static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 319         [C(L1D)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 320                 [C(OP_READ)] = {        0xc880,         0x400f0 },
 321                 [C(OP_WRITE)] = {       0,              0x300f0 },
 322                 [C(OP_PREFETCH)] = {    0xd8b8,         0       },
 323         },
 324         [C(L1I)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 325                 [C(OP_READ)] = {        0,              0x200fc },
 326                 [C(OP_WRITE)] = {       -1,             -1      },
 327                 [C(OP_PREFETCH)] = {    0x408a,         0       },
 328         },
 329         [C(LL)] = {             /*      RESULT_ACCESS   RESULT_MISS */
 330                 [C(OP_READ)] = {        0x16080,        0x26080 },
 331                 [C(OP_WRITE)] = {       0x16082,        0x26082 },
 332                 [C(OP_PREFETCH)] = {    0,              0       },
 333         },
 334         [C(DTLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 335                 [C(OP_READ)] = {        0,              0x300fc },
 336                 [C(OP_WRITE)] = {       -1,             -1      },
 337                 [C(OP_PREFETCH)] = {    -1,             -1      },
 338         },
 339         [C(ITLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 340                 [C(OP_READ)] = {        0,              0x400fc },
 341                 [C(OP_WRITE)] = {       -1,             -1      },
 342                 [C(OP_PREFETCH)] = {    -1,             -1      },
 343         },
 344         [C(BPU)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 345                 [C(OP_READ)] = {        0x10068,        0x400f6 },
 346                 [C(OP_WRITE)] = {       -1,             -1      },
 347                 [C(OP_PREFETCH)] = {    -1,             -1      },
 348         },
 349 };
 350
 351 static struct power_pmu power7_pmu = {
 352         .name                   = "POWER7",
 353         .n_counter              = 6,
 354         .max_alternatives       = MAX_ALT + 1,
 355         .add_fields             = 0x1555ul,
 356         .test_adder             = 0x3000ul,
 357         .compute_mmcr           = power7_compute_mmcr,
 358         .get_constraint         = power7_get_constraint,
 359         .get_alternatives       = power7_get_alternatives,
 360         .disable_pmc            = power7_disable_pmc,
 361         .flags                  = PPMU_ALT_SIPR,
 362         .n_generic              = ARRAY_SIZE(power7_generic_events),
 363         .generic_events         = power7_generic_events,
 364         .cache_events           = &power7_cache_events,
 365 };
 366
 367 static int init_power7_pmu(void)
 368 {
 369         if (!cur_cpu_spec->oprofile_cpu_type ||
 370             strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
 371                 return -ENODEV;
 372
 373         return register_power_pmu(&power7_pmu);
 374 }
 375
 376 arch_initcall(init_power7_pmu);