| /* |
| * Performance counter support for POWER7 processors. |
| * |
| * Copyright 2009 Paul Mackerras, IBM Corporation. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/perf_counter.h> |
| #include <linux/string.h> |
| #include <asm/reg.h> |
| #include <asm/cputable.h> |
| |
| /* |
| * Bits in event code for POWER7 |
| */ |
| #define PM_PMC_SH 16 /* PMC number (1-based) for direct events */ |
| #define PM_PMC_MSK 0xf |
| #define PM_PMC_MSKS (PM_PMC_MSK << PM_PMC_SH) |
| #define PM_UNIT_SH 12 /* TTMMUX number and setting - unit select */ |
| #define PM_UNIT_MSK 0xf |
| #define PM_COMBINE_SH 11 /* Combined event bit */ |
| #define PM_COMBINE_MSK 1 |
| #define PM_COMBINE_MSKS 0x800 |
| #define PM_L2SEL_SH 8 /* L2 event select */ |
| #define PM_L2SEL_MSK 7 |
| #define PM_PMCSEL_MSK 0xff |
| |
| /* |
| * Bits in MMCR1 for POWER7 |
| */ |
| #define MMCR1_TTM0SEL_SH 60 |
| #define MMCR1_TTM1SEL_SH 56 |
| #define MMCR1_TTM2SEL_SH 52 |
| #define MMCR1_TTM3SEL_SH 48 |
| #define MMCR1_TTMSEL_MSK 0xf |
| #define MMCR1_L2SEL_SH 45 |
| #define MMCR1_L2SEL_MSK 7 |
| #define MMCR1_PMC1_COMBINE_SH 35 |
| #define MMCR1_PMC2_COMBINE_SH 34 |
| #define MMCR1_PMC3_COMBINE_SH 33 |
| #define MMCR1_PMC4_COMBINE_SH 32 |
| #define MMCR1_PMC1SEL_SH 24 |
| #define MMCR1_PMC2SEL_SH 16 |
| #define MMCR1_PMC3SEL_SH 8 |
| #define MMCR1_PMC4SEL_SH 0 |
| #define MMCR1_PMCSEL_SH(n) (MMCR1_PMC1SEL_SH - (n) * 8) |
| #define MMCR1_PMCSEL_MSK 0xff |
| |
| /* |
| * Bits in MMCRA |
| */ |
| |
| /* |
| * Layout of constraint bits: |
| * 6666555555555544444444443333333333222222222211111111110000000000 |
| * 3210987654321098765432109876543210987654321098765432109876543210 |
| * [ ><><><><><><> |
| * NC P6P5P4P3P2P1 |
| * |
| * NC - number of counters |
| * 15: NC error 0x8000 |
| * 12-14: number of events needing PMC1-4 0x7000 |
| * |
| * P6 |
| * 11: P6 error 0x800 |
| * 10-11: Count of events needing PMC6 |
| * |
| * P1..P5 |
| * 0-9: Count of events needing PMC1..PMC5 |
| */ |
| |
| static int power7_get_constraint(u64 event, unsigned long *maskp, |
| unsigned long *valp) |
| { |
| int pmc, sh; |
| unsigned long mask = 0, value = 0; |
| |
| pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; |
| if (pmc) { |
| if (pmc > 6) |
| return -1; |
| sh = (pmc - 1) * 2; |
| mask |= 2 << sh; |
| value |= 1 << sh; |
| if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4)) |
| return -1; |
| } |
| if (pmc < 5) { |
| /* need a counter from PMC1-4 set */ |
| mask |= 0x8000; |
| value |= 0x1000; |
| } |
| *maskp = mask; |
| *valp = value; |
| return 0; |
| } |
| |
| #define MAX_ALT 2 /* at most 2 alternatives for any event */ |
| |
| static const unsigned int event_alternatives[][MAX_ALT] = { |
| { 0x200f2, 0x300f2 }, /* PM_INST_DISP */ |
| { 0x200f4, 0x600f4 }, /* PM_RUN_CYC */ |
| { 0x400fa, 0x500fa }, /* PM_RUN_INST_CMPL */ |
| }; |
| |
| /* |
| * Scan the alternatives table for a match and return the |
| * index into the alternatives table if found, else -1. |
| */ |
| static int find_alternative(u64 event) |
| { |
| int i, j; |
| |
| for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) { |
| if (event < event_alternatives[i][0]) |
| break; |
| for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j) |
| if (event == event_alternatives[i][j]) |
| return i; |
| } |
| return -1; |
| } |
| |
| static s64 find_alternative_decode(u64 event) |
| { |
| int pmc, psel; |
| |
| /* this only handles the 4x decode events */ |
| pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; |
| psel = event & PM_PMCSEL_MSK; |
| if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40) |
| return event - (1 << PM_PMC_SH) + 8; |
| if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48) |
| return event + (1 << PM_PMC_SH) - 8; |
| return -1; |
| } |
| |
| static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[]) |
| { |
| int i, j, nalt = 1; |
| s64 ae; |
| |
| alt[0] = event; |
| nalt = 1; |
| i = find_alternative(event); |
| if (i >= 0) { |
| for (j = 0; j < MAX_ALT; ++j) { |
| ae = event_alternatives[i][j]; |
| if (ae && ae != event) |
| alt[nalt++] = ae; |
| } |
| } else { |
| ae = find_alternative_decode(event); |
| if (ae > 0) |
| alt[nalt++] = ae; |
| } |
| |
| if (flags & PPMU_ONLY_COUNT_RUN) { |
| /* |
| * We're only counting in RUN state, |
| * so PM_CYC is equivalent to PM_RUN_CYC |
| * and PM_INST_CMPL === PM_RUN_INST_CMPL. |
| * This doesn't include alternatives that don't provide |
| * any extra flexibility in assigning PMCs. |
| */ |
| j = nalt; |
| for (i = 0; i < nalt; ++i) { |
| switch (alt[i]) { |
| case 0x1e: /* PM_CYC */ |
| alt[j++] = 0x600f4; /* PM_RUN_CYC */ |
| break; |
| case 0x600f4: /* PM_RUN_CYC */ |
| alt[j++] = 0x1e; |
| break; |
| case 0x2: /* PM_PPC_CMPL */ |
| alt[j++] = 0x500fa; /* PM_RUN_INST_CMPL */ |
| break; |
| case 0x500fa: /* PM_RUN_INST_CMPL */ |
| alt[j++] = 0x2; /* PM_PPC_CMPL */ |
| break; |
| } |
| } |
| nalt = j; |
| } |
| |
| return nalt; |
| } |
| |
| /* |
| * Returns 1 if event counts things relating to marked instructions |
| * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not. |
| */ |
| static int power7_marked_instr_event(u64 event) |
| { |
| int pmc, psel; |
| int unit; |
| |
| pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; |
| unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK; |
| psel = event & PM_PMCSEL_MSK & ~1; /* trim off edge/level bit */ |
| if (pmc >= 5) |
| return 0; |
| |
| switch (psel >> 4) { |
| case 2: |
| return pmc == 2 || pmc == 4; |
| case 3: |
| if (psel == 0x3c) |
| return pmc == 1; |
| if (psel == 0x3e) |
| return pmc != 2; |
| return 1; |
| case 4: |
| case 5: |
| return unit == 0xd; |
| case 6: |
| if (psel == 0x64) |
| return pmc >= 3; |
| case 8: |
| return unit == 0xd; |
| } |
| return 0; |
| } |
| |
| static int power7_compute_mmcr(u64 event[], int n_ev, |
| unsigned int hwc[], unsigned long mmcr[]) |
| { |
| unsigned long mmcr1 = 0; |
| unsigned long mmcra = 0; |
| unsigned int pmc, unit, combine, l2sel, psel; |
| unsigned int pmc_inuse = 0; |
| int i; |
| |
| /* First pass to count resource use */ |
| for (i = 0; i < n_ev; ++i) { |
| pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK; |
| if (pmc) { |
| if (pmc > 6) |
| return -1; |
| if (pmc_inuse & (1 << (pmc - 1))) |
| return -1; |
| pmc_inuse |= 1 << (pmc - 1); |
| } |
| } |
| |
| /* Second pass: assign PMCs, set all MMCR1 fields */ |
| for (i = 0; i < n_ev; ++i) { |
| pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK; |
| unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK; |
| combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK; |
| l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK; |
| psel = event[i] & PM_PMCSEL_MSK; |
| if (!pmc) { |
| /* Bus event or any-PMC direct event */ |
| for (pmc = 0; pmc < 4; ++pmc) { |
| if (!(pmc_inuse & (1 << pmc))) |
| break; |
| } |
| if (pmc >= 4) |
| return -1; |
| pmc_inuse |= 1 << pmc; |
| } else { |
| /* Direct or decoded event */ |
| --pmc; |
| } |
| if (pmc <= 3) { |
| mmcr1 |= (unsigned long) unit |
| << (MMCR1_TTM0SEL_SH - 4 * pmc); |
| mmcr1 |= (unsigned long) combine |
| << (MMCR1_PMC1_COMBINE_SH - pmc); |
| mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc); |
| if (unit == 6) /* L2 events */ |
| mmcr1 |= (unsigned long) l2sel |
| << MMCR1_L2SEL_SH; |
| } |
| if (power7_marked_instr_event(event[i])) |
| mmcra |= MMCRA_SAMPLE_ENABLE; |
| hwc[i] = pmc; |
| } |
| |
| /* Return MMCRx values */ |
| mmcr[0] = 0; |
| if (pmc_inuse & 1) |
| mmcr[0] = MMCR0_PMC1CE; |
| if (pmc_inuse & 0x3e) |
| mmcr[0] |= MMCR0_PMCjCE; |
| mmcr[1] = mmcr1; |
| mmcr[2] = mmcra; |
| return 0; |
| } |
| |
| static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[]) |
| { |
| if (pmc <= 3) |
| mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc)); |
| } |
| |
| static int power7_generic_events[] = { |
| [PERF_COUNT_HW_CPU_CYCLES] = 0x1e, |
| [PERF_COUNT_HW_INSTRUCTIONS] = 2, |
| [PERF_COUNT_HW_CACHE_REFERENCES] = 0xc880, /* LD_REF_L1_LSU*/ |
| [PERF_COUNT_HW_CACHE_MISSES] = 0x400f0, /* LD_MISS_L1 */ |
| [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x10068, /* BRU_FIN */ |
| [PERF_COUNT_HW_BRANCH_MISSES] = 0x400f6, /* BR_MPRED */ |
| }; |
| |
| #define C(x) PERF_COUNT_HW_CACHE_##x |
| |
| /* |
| * Table of generalized cache-related events. |
| * 0 means not supported, -1 means nonsensical, other values |
| * are event codes. |
| */ |
| static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { |
| [C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */ |
| [C(OP_READ)] = { 0xc880, 0x400f0 }, |
| [C(OP_WRITE)] = { 0, 0x300f0 }, |
| [C(OP_PREFETCH)] = { 0xd8b8, 0 }, |
| }, |
| [C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */ |
| [C(OP_READ)] = { 0, 0x200fc }, |
| [C(OP_WRITE)] = { -1, -1 }, |
| [C(OP_PREFETCH)] = { 0x408a, 0 }, |
| }, |
| [C(LL)] = { /* RESULT_ACCESS RESULT_MISS */ |
| [C(OP_READ)] = { 0x16080, 0x26080 }, |
| [C(OP_WRITE)] = { 0x16082, 0x26082 }, |
| [C(OP_PREFETCH)] = { 0, 0 }, |
| }, |
| [C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */ |
| [C(OP_READ)] = { 0, 0x300fc }, |
| [C(OP_WRITE)] = { -1, -1 }, |
| [C(OP_PREFETCH)] = { -1, -1 }, |
| }, |
| [C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */ |
| [C(OP_READ)] = { 0, 0x400fc }, |
| [C(OP_WRITE)] = { -1, -1 }, |
| [C(OP_PREFETCH)] = { -1, -1 }, |
| }, |
| [C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */ |
| [C(OP_READ)] = { 0x10068, 0x400f6 }, |
| [C(OP_WRITE)] = { -1, -1 }, |
| [C(OP_PREFETCH)] = { -1, -1 }, |
| }, |
| }; |
| |
| static struct power_pmu power7_pmu = { |
| .name = "POWER7", |
| .n_counter = 6, |
| .max_alternatives = MAX_ALT + 1, |
| .add_fields = 0x1555ul, |
| .test_adder = 0x3000ul, |
| .compute_mmcr = power7_compute_mmcr, |
| .get_constraint = power7_get_constraint, |
| .get_alternatives = power7_get_alternatives, |
| .disable_pmc = power7_disable_pmc, |
| .flags = PPMU_ALT_SIPR, |
| .n_generic = ARRAY_SIZE(power7_generic_events), |
| .generic_events = power7_generic_events, |
| .cache_events = &power7_cache_events, |
| }; |
| |
| static int init_power7_pmu(void) |
| { |
| if (!cur_cpu_spec->oprofile_cpu_type || |
| strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7")) |
| return -ENODEV; |
| |
| return register_power_pmu(&power7_pmu); |
| } |
| |
| arch_initcall(init_power7_pmu); |