arch/powerpc/kernel/ppc970-pmu.c

   1 /*
   2  * Performance counter support for PPC970-family processors.
   3  *
   4  * Copyright 2008-2009 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/string.h>
  12 #include <linux/perf_event.h>
  13 #include <asm/reg.h>
  14 #include <asm/cputable.h>
  15
  16 /*
  17  * Bits in event code for PPC970
  18  */
  19 #define PM_PMC_SH       12      /* PMC number (1-based) for direct events */
  20 #define PM_PMC_MSK      0xf
  21 #define PM_UNIT_SH      8       /* TTMMUX number and setting - unit select */
  22 #define PM_UNIT_MSK     0xf
  23 #define PM_SPCSEL_SH    6
  24 #define PM_SPCSEL_MSK   3
  25 #define PM_BYTE_SH      4       /* Byte number of event bus to use */
  26 #define PM_BYTE_MSK     3
  27 #define PM_PMCSEL_MSK   0xf
  28
  29 /* Values in PM_UNIT field */
  30 #define PM_NONE         0
  31 #define PM_FPU          1
  32 #define PM_VPU          2
  33 #define PM_ISU          3
  34 #define PM_IFU          4
  35 #define PM_IDU          5
  36 #define PM_STS          6
  37 #define PM_LSU0         7
  38 #define PM_LSU1U        8
  39 #define PM_LSU1L        9
  40 #define PM_LASTUNIT     9
  41
  42 /*
  43  * Bits in MMCR0 for PPC970
  44  */
  45 #define MMCR0_PMC1SEL_SH        8
  46 #define MMCR0_PMC2SEL_SH        1
  47 #define MMCR_PMCSEL_MSK         0x1f
  48
  49 /*
  50  * Bits in MMCR1 for PPC970
  51  */
  52 #define MMCR1_TTM0SEL_SH        62
  53 #define MMCR1_TTM1SEL_SH        59
  54 #define MMCR1_TTM3SEL_SH        53
  55 #define MMCR1_TTMSEL_MSK        3
  56 #define MMCR1_TD_CP_DBG0SEL_SH  50
  57 #define MMCR1_TD_CP_DBG1SEL_SH  48
  58 #define MMCR1_TD_CP_DBG2SEL_SH  46
  59 #define MMCR1_TD_CP_DBG3SEL_SH  44
  60 #define MMCR1_PMC1_ADDER_SEL_SH 39
  61 #define MMCR1_PMC2_ADDER_SEL_SH 38
  62 #define MMCR1_PMC6_ADDER_SEL_SH 37
  63 #define MMCR1_PMC5_ADDER_SEL_SH 36
  64 #define MMCR1_PMC8_ADDER_SEL_SH 35
  65 #define MMCR1_PMC7_ADDER_SEL_SH 34
  66 #define MMCR1_PMC3_ADDER_SEL_SH 33
  67 #define MMCR1_PMC4_ADDER_SEL_SH 32
  68 #define MMCR1_PMC3SEL_SH        27
  69 #define MMCR1_PMC4SEL_SH        22
  70 #define MMCR1_PMC5SEL_SH        17
  71 #define MMCR1_PMC6SEL_SH        12
  72 #define MMCR1_PMC7SEL_SH        7
  73 #define MMCR1_PMC8SEL_SH        2
  74
  75 static short mmcr1_adder_bits[8] = {
  76         MMCR1_PMC1_ADDER_SEL_SH,
  77         MMCR1_PMC2_ADDER_SEL_SH,
  78         MMCR1_PMC3_ADDER_SEL_SH,
  79         MMCR1_PMC4_ADDER_SEL_SH,
  80         MMCR1_PMC5_ADDER_SEL_SH,
  81         MMCR1_PMC6_ADDER_SEL_SH,
  82         MMCR1_PMC7_ADDER_SEL_SH,
  83         MMCR1_PMC8_ADDER_SEL_SH
  84 };
  85
  86 /*
  87  * Layout of constraint bits:
  88  * 6666555555555544444444443333333333222222222211111111110000000000
  89  * 3210987654321098765432109876543210987654321098765432109876543210
  90  *               <><><>[  >[  >[  ><  ><  ><  ><  ><><><><><><><><>
  91  *               SPT0T1 UC  PS1 PS2 B0  B1  B2  B3 P1P2P3P4P5P6P7P8
  92  *
  93  * SP - SPCSEL constraint
  94  *     48-49: SPCSEL value 0x3_0000_0000_0000
  95  *
  96  * T0 - TTM0 constraint
  97  *     46-47: TTM0SEL value (0=FPU, 2=IFU, 3=VPU) 0xC000_0000_0000
  98  *
  99  * T1 - TTM1 constraint
 100  *     44-45: TTM1SEL value (0=IDU, 3=STS) 0x3000_0000_0000
 101  *
 102  * UC - unit constraint: can't have all three of FPU|IFU|VPU, ISU, IDU|STS
 103  *     43: UC3 error 0x0800_0000_0000
 104  *     42: FPU|IFU|VPU events needed 0x0400_0000_0000
 105  *     41: ISU events needed 0x0200_0000_0000
 106  *     40: IDU|STS events needed 0x0100_0000_0000
 107  *
 108  * PS1
 109  *     39: PS1 error 0x0080_0000_0000
 110  *     36-38: count of events needing PMC1/2/5/6 0x0070_0000_0000
 111  *
 112  * PS2
 113  *     35: PS2 error 0x0008_0000_0000
 114  *     32-34: count of events needing PMC3/4/7/8 0x0007_0000_0000
 115  *
 116  * B0
 117  *     28-31: Byte 0 event source 0xf000_0000
 118  *            Encoding as for the event code
 119  *
 120  * B1, B2, B3
 121  *     24-27, 20-23, 16-19: Byte 1, 2, 3 event sources
 122  *
 123  * P1
 124  *     15: P1 error 0x8000
 125  *     14-15: Count of events needing PMC1
 126  *
 127  * P2..P8
 128  *     0-13: Count of events needing PMC2..PMC8
 129  */
 130
 131 static unsigned char direct_marked_event[8] = {
 132         (1<<2) | (1<<3),        /* PMC1: PM_MRK_GRP_DISP, PM_MRK_ST_CMPL */
 133         (1<<3) | (1<<5),        /* PMC2: PM_THRESH_TIMEO, PM_MRK_BRU_FIN */
 134         (1<<3) | (1<<5),        /* PMC3: PM_MRK_ST_CMPL_INT, PM_MRK_VMX_FIN */
 135         (1<<4) | (1<<5),        /* PMC4: PM_MRK_GRP_CMPL, PM_MRK_CRU_FIN */
 136         (1<<4) | (1<<5),        /* PMC5: PM_GRP_MRK, PM_MRK_GRP_TIMEO */
 137         (1<<3) | (1<<4) | (1<<5),
 138                 /* PMC6: PM_MRK_ST_STS, PM_MRK_FXU_FIN, PM_MRK_GRP_ISSUED */
 139         (1<<4) | (1<<5),        /* PMC7: PM_MRK_FPU_FIN, PM_MRK_INST_FIN */
 140         (1<<4)                  /* PMC8: PM_MRK_LSU_FIN */
 141 };
 142
 143 /*
 144  * Returns 1 if event counts things relating to marked instructions
 145  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 146  */
 147 static int p970_marked_instr_event(u64 event)
 148 {
 149         int pmc, psel, unit, byte, bit;
 150         unsigned int mask;
 151
 152         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 153         psel = event & PM_PMCSEL_MSK;
 154         if (pmc) {
 155                 if (direct_marked_event[pmc - 1] & (1 << psel))
 156                         return 1;
 157                 if (psel == 0)          /* add events */
 158                         bit = (pmc <= 4)? pmc - 1: 8 - pmc;
 159                 else if (psel == 7 || psel == 13)       /* decode events */
 160                         bit = 4;
 161                 else
 162                         return 0;
 163         } else
 164                 bit = psel;
 165
 166         byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
 167         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 168         mask = 0;
 169         switch (unit) {
 170         case PM_VPU:
 171                 mask = 0x4c;            /* byte 0 bits 2,3,6 */
 172                 break;
 173         case PM_LSU0:
 174                 /* byte 2 bits 0,2,3,4,6; all of byte 1 */
 175                 mask = 0x085dff00;
 176                 break;
 177         case PM_LSU1L:
 178                 mask = 0x50 << 24;      /* byte 3 bits 4,6 */
 179                 break;
 180         }
 181         return (mask >> (byte * 8 + bit)) & 1;
 182 }
 183
 184 /* Masks and values for using events from the various units */
 185 static unsigned long unit_cons[PM_LASTUNIT+1][2] = {
 186         [PM_FPU] =   { 0xc80000000000ull, 0x040000000000ull },
 187         [PM_VPU] =   { 0xc80000000000ull, 0xc40000000000ull },
 188         [PM_ISU] =   { 0x080000000000ull, 0x020000000000ull },
 189         [PM_IFU] =   { 0xc80000000000ull, 0x840000000000ull },
 190         [PM_IDU] =   { 0x380000000000ull, 0x010000000000ull },
 191         [PM_STS] =   { 0x380000000000ull, 0x310000000000ull },
 192 };
 193
 194 static int p970_get_constraint(u64 event, unsigned long *maskp,
 195                                unsigned long *valp)
 196 {
 197         int pmc, byte, unit, sh, spcsel;
 198         unsigned long mask = 0, value = 0;
 199         int grp = -1;
 200
 201         pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 202         if (pmc) {
 203                 if (pmc > 8)
 204                         return -1;
 205                 sh = (pmc - 1) * 2;
 206                 mask |= 2 << sh;
 207                 value |= 1 << sh;
 208                 grp = ((pmc - 1) >> 1) & 1;
 209         }
 210         unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 211         if (unit) {
 212                 if (unit > PM_LASTUNIT)
 213                         return -1;
 214                 mask |= unit_cons[unit][0];
 215                 value |= unit_cons[unit][1];
 216                 byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
 217                 /*
 218                  * Bus events on bytes 0 and 2 can be counted
 219                  * on PMC1/2/5/6; bytes 1 and 3 on PMC3/4/7/8.
 220                  */
 221                 if (!pmc)
 222                         grp = byte & 1;
 223                 /* Set byte lane select field */
 224                 mask  |= 0xfULL << (28 - 4 * byte);
 225                 value |= (unsigned long)unit << (28 - 4 * byte);
 226         }
 227         if (grp == 0) {
 228                 /* increment PMC1/2/5/6 field */
 229                 mask  |= 0x8000000000ull;
 230                 value |= 0x1000000000ull;
 231         } else if (grp == 1) {
 232                 /* increment PMC3/4/7/8 field */
 233                 mask  |= 0x800000000ull;
 234                 value |= 0x100000000ull;
 235         }
 236         spcsel = (event >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
 237         if (spcsel) {
 238                 mask  |= 3ull << 48;
 239                 value |= (unsigned long)spcsel << 48;
 240         }
 241         *maskp = mask;
 242         *valp = value;
 243         return 0;
 244 }
 245
 246 static int p970_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 247 {
 248         alt[0] = event;
 249
 250         /* 2 alternatives for LSU empty */
 251         if (event == 0x2002 || event == 0x3002) {
 252                 alt[1] = event ^ 0x1000;
 253                 return 2;
 254         }
 255
 256         return 1;
 257 }
 258
 259 static int p970_compute_mmcr(u64 event[], int n_ev,
 260                              unsigned int hwc[], unsigned long mmcr[])
 261 {
 262         unsigned long mmcr0 = 0, mmcr1 = 0, mmcra = 0;
 263         unsigned int pmc, unit, byte, psel;
 264         unsigned int ttm, grp;
 265         unsigned int pmc_inuse = 0;
 266         unsigned int pmc_grp_use[2];
 267         unsigned char busbyte[4];
 268         unsigned char unituse[16];
 269         unsigned char unitmap[] = { 0, 0<<3, 3<<3, 1<<3, 2<<3, 0|4, 3|4 };
 270         unsigned char ttmuse[2];
 271         unsigned char pmcsel[8];
 272         int i;
 273         int spcsel;
 274
 275         if (n_ev > 8)
 276                 return -1;
 277
 278         /* First pass to count resource use */
 279         pmc_grp_use[0] = pmc_grp_use[1] = 0;
 280         memset(busbyte, 0, sizeof(busbyte));
 281         memset(unituse, 0, sizeof(unituse));
 282         for (i = 0; i < n_ev; ++i) {
 283                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 284                 if (pmc) {
 285                         if (pmc_inuse & (1 << (pmc - 1)))
 286                                 return -1;
 287                         pmc_inuse |= 1 << (pmc - 1);
 288                         /* count 1/2/5/6 vs 3/4/7/8 use */
 289                         ++pmc_grp_use[((pmc - 1) >> 1) & 1];
 290                 }
 291                 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 292                 byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
 293                 if (unit) {
 294                         if (unit > PM_LASTUNIT)
 295                                 return -1;
 296                         if (!pmc)
 297                                 ++pmc_grp_use[byte & 1];
 298                         if (busbyte[byte] && busbyte[byte] != unit)
 299                                 return -1;
 300                         busbyte[byte] = unit;
 301                         unituse[unit] = 1;
 302                 }
 303         }
 304         if (pmc_grp_use[0] > 4 || pmc_grp_use[1] > 4)
 305                 return -1;
 306
 307         /*
 308          * Assign resources and set multiplexer selects.
 309          *
 310          * PM_ISU can go either on TTM0 or TTM1, but that's the only
 311          * choice we have to deal with.
 312          */
 313         if (unituse[PM_ISU] &
 314             (unituse[PM_FPU] | unituse[PM_IFU] | unituse[PM_VPU]))
 315                 unitmap[PM_ISU] = 2 | 4;        /* move ISU to TTM1 */
 316         /* Set TTM[01]SEL fields. */
 317         ttmuse[0] = ttmuse[1] = 0;
 318         for (i = PM_FPU; i <= PM_STS; ++i) {
 319                 if (!unituse[i])
 320                         continue;
 321                 ttm = unitmap[i];
 322                 ++ttmuse[(ttm >> 2) & 1];
 323                 mmcr1 |= (unsigned long)(ttm & ~4) << MMCR1_TTM1SEL_SH;
 324         }
 325         /* Check only one unit per TTMx */
 326         if (ttmuse[0] > 1 || ttmuse[1] > 1)
 327                 return -1;
 328
 329         /* Set byte lane select fields and TTM3SEL. */
 330         for (byte = 0; byte < 4; ++byte) {
 331                 unit = busbyte[byte];
 332                 if (!unit)
 333                         continue;
 334                 if (unit <= PM_STS)
 335                         ttm = (unitmap[unit] >> 2) & 1;
 336                 else if (unit == PM_LSU0)
 337                         ttm = 2;
 338                 else {
 339                         ttm = 3;
 340                         if (unit == PM_LSU1L && byte >= 2)
 341                                 mmcr1 |= 1ull << (MMCR1_TTM3SEL_SH + 3 - byte);
 342                 }
 343                 mmcr1 |= (unsigned long)ttm
 344                         << (MMCR1_TD_CP_DBG0SEL_SH - 2 * byte);
 345         }
 346
 347         /* Second pass: assign PMCs, set PMCxSEL and PMCx_ADDER_SEL fields */
 348         memset(pmcsel, 0x8, sizeof(pmcsel));    /* 8 means don't count */
 349         for (i = 0; i < n_ev; ++i) {
 350                 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 351                 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 352                 byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
 353                 psel = event[i] & PM_PMCSEL_MSK;
 354                 if (!pmc) {
 355                         /* Bus event or any-PMC direct event */
 356                         if (unit)
 357                                 psel |= 0x10 | ((byte & 2) << 2);
 358                         else
 359                                 psel |= 8;
 360                         for (pmc = 0; pmc < 8; ++pmc) {
 361                                 if (pmc_inuse & (1 << pmc))
 362                                         continue;
 363                                 grp = (pmc >> 1) & 1;
 364                                 if (unit) {
 365                                         if (grp == (byte & 1))
 366                                                 break;
 367                                 } else if (pmc_grp_use[grp] < 4) {
 368                                         ++pmc_grp_use[grp];
 369                                         break;
 370                                 }
 371                         }
 372                         pmc_inuse |= 1 << pmc;
 373                 } else {
 374                         /* Direct event */
 375                         --pmc;
 376                         if (psel == 0 && (byte & 2))
 377                                 /* add events on higher-numbered bus */
 378                                 mmcr1 |= 1ull << mmcr1_adder_bits[pmc];
 379                 }
 380                 pmcsel[pmc] = psel;
 381                 hwc[i] = pmc;
 382                 spcsel = (event[i] >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
 383                 mmcr1 |= spcsel;
 384                 if (p970_marked_instr_event(event[i]))
 385                         mmcra |= MMCRA_SAMPLE_ENABLE;
 386         }
 387         for (pmc = 0; pmc < 2; ++pmc)
 388                 mmcr0 |= pmcsel[pmc] << (MMCR0_PMC1SEL_SH - 7 * pmc);
 389         for (; pmc < 8; ++pmc)
 390                 mmcr1 |= (unsigned long)pmcsel[pmc]
 391                         << (MMCR1_PMC3SEL_SH - 5 * (pmc - 2));
 392         if (pmc_inuse & 1)
 393                 mmcr0 |= MMCR0_PMC1CE;
 394         if (pmc_inuse & 0xfe)
 395                 mmcr0 |= MMCR0_PMCjCE;
 396
 397         mmcra |= 0x2000;        /* mark only one IOP per PPC instruction */
 398
 399         /* Return MMCRx values */
 400         mmcr[0] = mmcr0;
 401         mmcr[1] = mmcr1;
 402         mmcr[2] = mmcra;
 403         return 0;
 404 }
 405
 406 static void p970_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 407 {
 408         int shift, i;
 409
 410         if (pmc <= 1) {
 411                 shift = MMCR0_PMC1SEL_SH - 7 * pmc;
 412                 i = 0;
 413         } else {
 414                 shift = MMCR1_PMC3SEL_SH - 5 * (pmc - 2);
 415                 i = 1;
 416         }
 417         /*
 418          * Setting the PMCxSEL field to 0x08 disables PMC x.
 419          */
 420         mmcr[i] = (mmcr[i] & ~(0x1fUL << shift)) | (0x08UL << shift);
 421 }
 422
 423 static int ppc970_generic_events[] = {
 424         [PERF_COUNT_HW_CPU_CYCLES]              = 7,
 425         [PERF_COUNT_HW_INSTRUCTIONS]            = 1,
 426         [PERF_COUNT_HW_CACHE_REFERENCES]        = 0x8810, /* PM_LD_REF_L1 */
 427         [PERF_COUNT_HW_CACHE_MISSES]            = 0x3810, /* PM_LD_MISS_L1 */
 428         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = 0x431,  /* PM_BR_ISSUED */
 429         [PERF_COUNT_HW_BRANCH_MISSES]           = 0x327,  /* PM_GRP_BR_MPRED */
 430 };
 431
 432 #define C(x)    PERF_COUNT_HW_CACHE_##x
 433
 434 /*
 435  * Table of generalized cache-related events.
 436  * 0 means not supported, -1 means nonsensical, other values
 437  * are event codes.
 438  */
 439 static int ppc970_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 440         [C(L1D)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 441                 [C(OP_READ)] = {        0x8810,         0x3810  },
 442                 [C(OP_WRITE)] = {       0x7810,         0x813   },
 443                 [C(OP_PREFETCH)] = {    0x731,          0       },
 444         },
 445         [C(L1I)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 446                 [C(OP_READ)] = {        0,              0       },
 447                 [C(OP_WRITE)] = {       -1,             -1      },
 448                 [C(OP_PREFETCH)] = {    0,              0       },
 449         },
 450         [C(LL)] = {             /*      RESULT_ACCESS   RESULT_MISS */
 451                 [C(OP_READ)] = {        0,              0       },
 452                 [C(OP_WRITE)] = {       0,              0       },
 453                 [C(OP_PREFETCH)] = {    0x733,          0       },
 454         },
 455         [C(DTLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 456                 [C(OP_READ)] = {        0,              0x704   },
 457                 [C(OP_WRITE)] = {       -1,             -1      },
 458                 [C(OP_PREFETCH)] = {    -1,             -1      },
 459         },
 460         [C(ITLB)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 461                 [C(OP_READ)] = {        0,              0x700   },
 462                 [C(OP_WRITE)] = {       -1,             -1      },
 463                 [C(OP_PREFETCH)] = {    -1,             -1      },
 464         },
 465         [C(BPU)] = {            /*      RESULT_ACCESS   RESULT_MISS */
 466                 [C(OP_READ)] = {        0x431,          0x327   },
 467                 [C(OP_WRITE)] = {       -1,             -1      },
 468                 [C(OP_PREFETCH)] = {    -1,             -1      },
 469         },
 470 };
 471
 472 static struct power_pmu ppc970_pmu = {
 473         .name                   = "PPC970/FX/MP",
 474         .n_counter              = 8,
 475         .max_alternatives       = 2,
 476         .add_fields             = 0x001100005555ull,
 477         .test_adder             = 0x013300000000ull,
 478         .compute_mmcr           = p970_compute_mmcr,
 479         .get_constraint         = p970_get_constraint,
 480         .get_alternatives       = p970_get_alternatives,
 481         .disable_pmc            = p970_disable_pmc,
 482         .n_generic              = ARRAY_SIZE(ppc970_generic_events),
 483         .generic_events         = ppc970_generic_events,
 484         .cache_events           = &ppc970_cache_events,
 485 };
 486
 487 static int init_ppc970_pmu(void)
 488 {
 489         if (!cur_cpu_spec->oprofile_cpu_type ||
 490             (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/970")
 491              && strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/970MP")))
 492                 return -ENODEV;
 493
 494         return register_power_pmu(&ppc970_pmu);
 495 }
 496
 497 arch_initcall(init_ppc970_pmu);