diff options
Diffstat (limited to 'arch/powerpc/kernel/mpc7450-pmu.c')
| -rw-r--r-- | arch/powerpc/kernel/mpc7450-pmu.c | 422 |
1 files changed, 0 insertions, 422 deletions
diff --git a/arch/powerpc/kernel/mpc7450-pmu.c b/arch/powerpc/kernel/mpc7450-pmu.c deleted file mode 100644 index fe21b51..0000000 --- a/arch/powerpc/kernel/mpc7450-pmu.c +++ /dev/null @@ -1,422 +0,0 @@ -/* - * Performance counter support for MPC7450-family processors. - * - * Copyright 2008-2009 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/string.h> -#include <linux/perf_event.h> -#include <asm/reg.h> -#include <asm/cputable.h> - -#define N_COUNTER 6 /* Number of hardware counters */ -#define MAX_ALT 3 /* Maximum number of event alternative codes */ - -/* - * Bits in event code for MPC7450 family - */ -#define PM_THRMULT_MSKS 0x40000 -#define PM_THRESH_SH 12 -#define PM_THRESH_MSK 0x3f -#define PM_PMC_SH 8 -#define PM_PMC_MSK 7 -#define PM_PMCSEL_MSK 0x7f - -/* - * Classify events according to how specific their PMC requirements are. - * Result is: - * 0: can go on any PMC - * 1: can go on PMCs 1-4 - * 2: can go on PMCs 1,2,4 - * 3: can go on PMCs 1 or 2 - * 4: can only go on one PMC - * -1: event code is invalid - */ -#define N_CLASSES 5 - -static int mpc7450_classify_event(u32 event) -{ - int pmc; - - pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; - if (pmc) { - if (pmc > N_COUNTER) - return -1; - return 4; - } - event &= PM_PMCSEL_MSK; - if (event <= 1) - return 0; - if (event <= 7) - return 1; - if (event <= 13) - return 2; - if (event <= 22) - return 3; - return -1; -} - -/* - * Events using threshold and possible threshold scale: - * code scale? name - * 11e N PM_INSTQ_EXCEED_CYC - * 11f N PM_ALTV_IQ_EXCEED_CYC - * 128 Y PM_DTLB_SEARCH_EXCEED_CYC - * 12b Y PM_LD_MISS_EXCEED_L1_CYC - * 220 N PM_CQ_EXCEED_CYC - * 30c N PM_GPR_RB_EXCEED_CYC - * 30d ? PM_FPR_IQ_EXCEED_CYC ? - * 311 Y PM_ITLB_SEARCH_EXCEED - * 410 N PM_GPR_IQ_EXCEED_CYC - */ - -/* - * Return use of threshold and threshold scale bits: - * 0 = uses neither, 1 = uses threshold, 2 = uses both - */ -static int mpc7450_threshold_use(u32 event) -{ - int pmc, sel; - - pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; - sel = event & PM_PMCSEL_MSK; - switch (pmc) { - case 1: - if (sel == 0x1e || sel == 0x1f) - return 1; - if (sel == 0x28 || sel == 0x2b) - return 2; - break; - case 2: - if (sel == 0x20) - return 1; - break; - case 3: - if (sel == 0xc || sel == 0xd) - return 1; - if (sel == 0x11) - return 2; - break; - case 4: - if (sel == 0x10) - return 1; - break; - } - return 0; -} - -/* - * Layout of constraint bits: - * 33222222222211111111110000000000 - * 10987654321098765432109876543210 - * |< >< > < > < ><><><><><><> - * TS TV G4 G3 G2P6P5P4P3P2P1 - * - * P1 - P6 - * 0 - 11: Count of events needing PMC1 .. PMC6 - * - * G2 - * 12 - 14: Count of events needing PMC1 or PMC2 - * - * G3 - * 16 - 18: Count of events needing PMC1, PMC2 or PMC4 - * - * G4 - * 20 - 23: Count of events needing PMC1, PMC2, PMC3 or PMC4 - * - * TV - * 24 - 29: Threshold value requested - * - * TS - * 30: Threshold scale value requested - */ - -static u32 pmcbits[N_COUNTER][2] = { - { 0x00844002, 0x00111001 }, /* PMC1 mask, value: P1,G2,G3,G4 */ - { 0x00844008, 0x00111004 }, /* PMC2: P2,G2,G3,G4 */ - { 0x00800020, 0x00100010 }, /* PMC3: P3,G4 */ - { 0x00840080, 0x00110040 }, /* PMC4: P4,G3,G4 */ - { 0x00000200, 0x00000100 }, /* PMC5: P5 */ - { 0x00000800, 0x00000400 } /* PMC6: P6 */ -}; - -static u32 classbits[N_CLASSES - 1][2] = { - { 0x00000000, 0x00000000 }, /* class 0: no constraint */ - { 0x00800000, 0x00100000 }, /* class 1: G4 */ - { 0x00040000, 0x00010000 }, /* class 2: G3 */ - { 0x00004000, 0x00001000 }, /* class 3: G2 */ -}; - -static int mpc7450_get_constraint(u64 event, unsigned long *maskp, - unsigned long *valp) -{ - int pmc, class; - u32 mask, value; - int thresh, tuse; - - class = mpc7450_classify_event(event); - if (class < 0) - return -1; - if (class == 4) { - pmc = ((unsigned int)event >> PM_PMC_SH) & PM_PMC_MSK; - mask = pmcbits[pmc - 1][0]; - value = pmcbits[pmc - 1][1]; - } else { - mask = classbits[class][0]; - value = classbits[class][1]; - } - - tuse = mpc7450_threshold_use(event); - if (tuse) { - thresh = ((unsigned int)event >> PM_THRESH_SH) & PM_THRESH_MSK; - mask |= 0x3f << 24; - value |= thresh << 24; - if (tuse == 2) { - mask |= 0x40000000; - if ((unsigned int)event & PM_THRMULT_MSKS) - value |= 0x40000000; - } - } - - *maskp = mask; - *valp = value; - return 0; -} - -static const unsigned int event_alternatives[][MAX_ALT] = { - { 0x217, 0x317 }, /* PM_L1_DCACHE_MISS */ - { 0x418, 0x50f, 0x60f }, /* PM_SNOOP_RETRY */ - { 0x502, 0x602 }, /* PM_L2_HIT */ - { 0x503, 0x603 }, /* PM_L3_HIT */ - { 0x504, 0x604 }, /* PM_L2_ICACHE_MISS */ - { 0x505, 0x605 }, /* PM_L3_ICACHE_MISS */ - { 0x506, 0x606 }, /* PM_L2_DCACHE_MISS */ - { 0x507, 0x607 }, /* PM_L3_DCACHE_MISS */ - { 0x50a, 0x623 }, /* PM_LD_HIT_L3 */ - { 0x50b, 0x624 }, /* PM_ST_HIT_L3 */ - { 0x50d, 0x60d }, /* PM_L2_TOUCH_HIT */ - { 0x50e, 0x60e }, /* PM_L3_TOUCH_HIT */ - { 0x512, 0x612 }, /* PM_INT_LOCAL */ - { 0x513, 0x61d }, /* PM_L2_MISS */ - { 0x514, 0x61e }, /* PM_L3_MISS */ -}; - -/* - * Scan the alternatives table for a match and return the - * index into the alternatives table if found, else -1. - */ -static int find_alternative(u32 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 int mpc7450_get_alternatives(u64 event, unsigned int flags, u64 alt[]) -{ - int i, j, nalt = 1; - u32 ae; - - alt[0] = event; - nalt = 1; - i = find_alternative((u32)event); - if (i >= 0) { - for (j = 0; j < MAX_ALT; ++j) { - ae = event_alternatives[i][j]; - if (ae && ae != (u32)event) - alt[nalt++] = ae; - } - } - return nalt; -} - -/* - * Bitmaps of which PMCs each class can use for classes 0 - 3. - * Bit i is set if PMC i+1 is usable. - */ -static const u8 classmap[N_CLASSES] = { - 0x3f, 0x0f, 0x0b, 0x03, 0 -}; - -/* Bit position and width of each PMCSEL field */ -static const int pmcsel_shift[N_COUNTER] = { - 6, 0, 27, 22, 17, 11 -}; -static const u32 pmcsel_mask[N_COUNTER] = { - 0x7f, 0x3f, 0x1f, 0x1f, 0x1f, 0x3f -}; - -/* - * Compute MMCR0/1/2 values for a set of events. - */ -static int mpc7450_compute_mmcr(u64 event[], int n_ev, - unsigned int hwc[], unsigned long mmcr[]) -{ - u8 event_index[N_CLASSES][N_COUNTER]; - int n_classevent[N_CLASSES]; - int i, j, class, tuse; - u32 pmc_inuse = 0, pmc_avail; - u32 mmcr0 = 0, mmcr1 = 0, mmcr2 = 0; - u32 ev, pmc, thresh; - - if (n_ev > N_COUNTER) - return -1; - - /* First pass: count usage in each class */ - for (i = 0; i < N_CLASSES; ++i) - n_classevent[i] = 0; - for (i = 0; i < n_ev; ++i) { - class = mpc7450_classify_event(event[i]); - if (class < 0) - return -1; - j = n_classevent[class]++; - event_index[class][j] = i; - } - - /* Second pass: allocate PMCs from most specific event to least */ - for (class = N_CLASSES - 1; class >= 0; --class) { - for (i = 0; i < n_classevent[class]; ++i) { - ev = event[event_index[class][i]]; - if (class == 4) { - pmc = (ev >> PM_PMC_SH) & PM_PMC_MSK; - if (pmc_inuse & (1 << (pmc - 1))) - return -1; - } else { - /* Find a suitable PMC */ - pmc_avail = classmap[class] & ~pmc_inuse; - if (!pmc_avail) - return -1; - pmc = ffs(pmc_avail); - } - pmc_inuse |= 1 << (pmc - 1); - - tuse = mpc7450_threshold_use(ev); - if (tuse) { - thresh = (ev >> PM_THRESH_SH) & PM_THRESH_MSK; - mmcr0 |= thresh << 16; - if (tuse == 2 && (ev & PM_THRMULT_MSKS)) - mmcr2 = 0x80000000; - } - ev &= pmcsel_mask[pmc - 1]; - ev <<= pmcsel_shift[pmc - 1]; - if (pmc <= 2) - mmcr0 |= ev; - else - mmcr1 |= ev; - hwc[event_index[class][i]] = pmc - 1; - } - } - - if (pmc_inuse & 1) - mmcr0 |= MMCR0_PMC1CE; - if (pmc_inuse & 0x3e) - mmcr0 |= MMCR0_PMCnCE; - - /* Return MMCRx values */ - mmcr[0] = mmcr0; - mmcr[1] = mmcr1; - mmcr[2] = mmcr2; - return 0; -} - -/* - * Disable counting by a PMC. - * Note that the pmc argument is 0-based here, not 1-based. - */ -static void mpc7450_disable_pmc(unsigned int pmc, unsigned long mmcr[]) -{ - if (pmc <= 1) - mmcr[0] &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]); - else - mmcr[1] &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]); -} - -static int mpc7450_generic_events[] = { - [PERF_COUNT_HW_CPU_CYCLES] = 1, - [PERF_COUNT_HW_INSTRUCTIONS] = 2, - [PERF_COUNT_HW_CACHE_MISSES] = 0x217, /* PM_L1_DCACHE_MISS */ - [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x122, /* PM_BR_CMPL */ - [PERF_COUNT_HW_BRANCH_MISSES] = 0x41c, /* PM_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 mpc7450_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { - [C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { 0, 0x225 }, - [C(OP_WRITE)] = { 0, 0x227 }, - [C(OP_PREFETCH)] = { 0, 0 }, - }, - [C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { 0x129, 0x115 }, - [C(OP_WRITE)] = { -1, -1 }, - [C(OP_PREFETCH)] = { 0x634, 0 }, - }, - [C(LL)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { 0, 0 }, - [C(OP_WRITE)] = { 0, 0 }, - [C(OP_PREFETCH)] = { 0, 0 }, - }, - [C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { 0, 0x312 }, - [C(OP_WRITE)] = { -1, -1 }, - [C(OP_PREFETCH)] = { -1, -1 }, - }, - [C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { 0, 0x223 }, - [C(OP_WRITE)] = { -1, -1 }, - [C(OP_PREFETCH)] = { -1, -1 }, - }, - [C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { 0x122, 0x41c }, - [C(OP_WRITE)] = { -1, -1 }, - [C(OP_PREFETCH)] = { -1, -1 }, - }, - [C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */ - [C(OP_READ)] = { -1, -1 }, - [C(OP_WRITE)] = { -1, -1 }, - [C(OP_PREFETCH)] = { -1, -1 }, - }, -}; - -struct power_pmu mpc7450_pmu = { - .name = "MPC7450 family", - .n_counter = N_COUNTER, - .max_alternatives = MAX_ALT, - .add_fields = 0x00111555ul, - .test_adder = 0x00301000ul, - .compute_mmcr = mpc7450_compute_mmcr, - .get_constraint = mpc7450_get_constraint, - .get_alternatives = mpc7450_get_alternatives, - .disable_pmc = mpc7450_disable_pmc, - .n_generic = ARRAY_SIZE(mpc7450_generic_events), - .generic_events = mpc7450_generic_events, - .cache_events = &mpc7450_cache_events, -}; - -static int __init init_mpc7450_pmu(void) -{ - if (!cur_cpu_spec->oprofile_cpu_type || - strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc/7450")) - return -ENODEV; - - return register_power_pmu(&mpc7450_pmu); -} - -early_initcall(init_mpc7450_pmu); |
