LXR linux/arch/powerpc/perf/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
  75static 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
 131static 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 */
 147static 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 */
 185static 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
 194static 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
 246static 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
 259static int p970_compute_mmcr(u64 event[], int n_ev,
 260                             unsigned int hwc[], unsigned long mmcr[], struct perf_event *pevents[])
 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
 406static 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
 423static 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 */
 439static 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        [C(NODE)] = {           /*      RESULT_ACCESS   RESULT_MISS */
 471                [C(OP_READ)] = {        -1,             -1      },
 472                [C(OP_WRITE)] = {       -1,             -1      },
 473                [C(OP_PREFETCH)] = {    -1,             -1      },
 474        },
 475};
 476
 477static struct power_pmu ppc970_pmu = {
 478        .name                   = "PPC970/FX/MP",
 479        .n_counter              = 8,
 480        .max_alternatives       = 2,
 481        .add_fields             = 0x001100005555ull,
 482        .test_adder             = 0x013300000000ull,
 483        .compute_mmcr           = p970_compute_mmcr,
 484        .get_constraint         = p970_get_constraint,
 485        .get_alternatives       = p970_get_alternatives,
 486        .disable_pmc            = p970_disable_pmc,
 487        .n_generic              = ARRAY_SIZE(ppc970_generic_events),
 488        .generic_events         = ppc970_generic_events,
 489        .cache_events           = &ppc970_cache_events,
 490        .flags                  = PPMU_NO_SIPR | PPMU_NO_CONT_SAMPLING,
 491};
 492
 493static int __init init_ppc970_pmu(void)
 494{
 495        if (!cur_cpu_spec->oprofile_cpu_type ||
 496            (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/970")
 497             && strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/970MP")))
 498                return -ENODEV;
 499
 500        return register_power_pmu(&ppc970_pmu);
 501}
 502
 503early_initcall(init_ppc970_pmu);
 504