/*
 * Common Performance counter support functions for PowerISA v2.07 processors.
 *
 * Copyright 2009 Paul Mackerras, IBM Corporation.
 * Copyright 2013 Michael Ellerman, IBM Corporation.
 * Copyright 2016 Madhavan Srinivasan, 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 "isa207-common.h"

PMU_FORMAT_ATTR(event,          "config:0-49");
PMU_FORMAT_ATTR(pmcxsel,        "config:0-7");
PMU_FORMAT_ATTR(mark,           "config:8");
PMU_FORMAT_ATTR(combine,        "config:11");
PMU_FORMAT_ATTR(unit,           "config:12-15");
PMU_FORMAT_ATTR(pmc,            "config:16-19");
PMU_FORMAT_ATTR(cache_sel,      "config:20-23");
PMU_FORMAT_ATTR(sample_mode,    "config:24-28");
PMU_FORMAT_ATTR(thresh_sel,     "config:29-31");
PMU_FORMAT_ATTR(thresh_stop,    "config:32-35");
PMU_FORMAT_ATTR(thresh_start,   "config:36-39");
PMU_FORMAT_ATTR(thresh_cmp,     "config:40-49");

struct attribute *isa207_pmu_format_attr[] = {
        &format_attr_event.attr,
        &format_attr_pmcxsel.attr,
        &format_attr_mark.attr,
        &format_attr_combine.attr,
        &format_attr_unit.attr,
        &format_attr_pmc.attr,
        &format_attr_cache_sel.attr,
        &format_attr_sample_mode.attr,
        &format_attr_thresh_sel.attr,
        &format_attr_thresh_stop.attr,
        &format_attr_thresh_start.attr,
        &format_attr_thresh_cmp.attr,
        NULL,
};

struct attribute_group isa207_pmu_format_group = {
        .name = "format",
        .attrs = isa207_pmu_format_attr,
};

static inline bool event_is_fab_match(u64 event)
{
        /* Only check pmc, unit and pmcxsel, ignore the edge bit (0) */
        event &= 0xff0fe;

        /* PM_MRK_FAB_RSP_MATCH & PM_MRK_FAB_RSP_MATCH_CYC */
        return (event == 0x30056 || event == 0x4f052);
}

static bool is_event_valid(u64 event)
{
        u64 valid_mask = EVENT_VALID_MASK;

        if (cpu_has_feature(CPU_FTR_ARCH_300) && !cpu_has_feature(CPU_FTR_POWER9_DD1))
                valid_mask = p9_EVENT_VALID_MASK;

        return !(event & ~valid_mask);
}

static inline bool is_event_marked(u64 event)
{
        if (event & EVENT_IS_MARKED)
                return true;

        return false;
}

static void mmcra_sdar_mode(u64 event, unsigned long *mmcra)
{
        /*
         * MMCRA[SDAR_MODE] specifices how the SDAR should be updated in
         * continous sampling mode.
         *
         * Incase of Power8:
         * MMCRA[SDAR_MODE] will be programmed as "0b01" for continous sampling
         * mode and will be un-changed when setting MMCRA[63] (Marked events).
         *
         * Incase of Power9:
         * Marked event: MMCRA[SDAR_MODE] will be set to 0b00 ('No Updates'),
         *               or if group already have any marked events.
         * Non-Marked events (for DD1):
         *      MMCRA[SDAR_MODE] will be set to 0b01
         * For rest
         *      MMCRA[SDAR_MODE] will be set from event code.
         */
        if (cpu_has_feature(CPU_FTR_ARCH_300)) {
                if (is_event_marked(event) || (*mmcra & MMCRA_SAMPLE_ENABLE))
                        *mmcra &= MMCRA_SDAR_MODE_NO_UPDATES;
                else if (!cpu_has_feature(CPU_FTR_POWER9_DD1))
                        *mmcra |=  p9_SDAR_MODE(event) << MMCRA_SDAR_MODE_SHIFT;
                else if (cpu_has_feature(CPU_FTR_POWER9_DD1))
                        *mmcra |= MMCRA_SDAR_MODE_TLB;
        } else
                *mmcra |= MMCRA_SDAR_MODE_TLB;
}

static u64 thresh_cmp_val(u64 value)
{
        if (cpu_has_feature(CPU_FTR_ARCH_300) && !cpu_has_feature(CPU_FTR_POWER9_DD1))
                return value << p9_MMCRA_THR_CMP_SHIFT;

        return value << MMCRA_THR_CMP_SHIFT;
}

static unsigned long combine_from_event(u64 event)
{
        if (cpu_has_feature(CPU_FTR_ARCH_300) && !cpu_has_feature(CPU_FTR_POWER9_DD1))
                return p9_EVENT_COMBINE(event);

        return EVENT_COMBINE(event);
}

static unsigned long combine_shift(unsigned long pmc)
{
        if (cpu_has_feature(CPU_FTR_ARCH_300) && !cpu_has_feature(CPU_FTR_POWER9_DD1))
                return p9_MMCR1_COMBINE_SHIFT(pmc);

        return MMCR1_COMBINE_SHIFT(pmc);
}

static inline bool event_is_threshold(u64 event)
{
        return (event >> EVENT_THR_SEL_SHIFT) & EVENT_THR_SEL_MASK;
}

static bool is_thresh_cmp_valid(u64 event)
{
        unsigned int cmp, exp;

        /*
         * Check the mantissa upper two bits are not zero, unless the
         * exponent is also zero. See the THRESH_CMP_MANTISSA doc.
         */
        cmp = (event >> EVENT_THR_CMP_SHIFT) & EVENT_THR_CMP_MASK;
        exp = cmp >> 7;

        if (exp && (cmp & 0x60) == 0)
                return false;

        return true;
}

int isa207_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp)
{
        unsigned int unit, pmc, cache, ebb;
        unsigned long mask, value;

        mask = value = 0;

        if (!is_event_valid(event))
                return -1;

        pmc   = (event >> EVENT_PMC_SHIFT)        & EVENT_PMC_MASK;
        unit  = (event >> EVENT_UNIT_SHIFT)       & EVENT_UNIT_MASK;
        cache = (event >> EVENT_CACHE_SEL_SHIFT)  & EVENT_CACHE_SEL_MASK;
        ebb   = (event >> EVENT_EBB_SHIFT)        & EVENT_EBB_MASK;

        if (pmc) {
                u64 base_event;

                if (pmc > 6)
                        return -1;

                /* Ignore Linux defined bits when checking event below */
                base_event = event & ~EVENT_LINUX_MASK;

                if (pmc >= 5 && base_event != 0x500fa &&
                                base_event != 0x600f4)
                        return -1;

                mask  |= CNST_PMC_MASK(pmc);
                value |= CNST_PMC_VAL(pmc);
        }

        if (pmc <= 4) {
                /*
                 * Add to number of counters in use. Note this includes events with
                 * a PMC of 0 - they still need a PMC, it's just assigned later.
                 * Don't count events on PMC 5 & 6, there is only one valid event
                 * on each of those counters, and they are handled above.
                 */
                mask  |= CNST_NC_MASK;
                value |= CNST_NC_VAL;
        }

        if (unit >= 6 && unit <= 9) {
                /*
                 * L2/L3 events contain a cache selector field, which is
                 * supposed to be programmed into MMCRC. However MMCRC is only
                 * HV writable, and there is no API for guest kernels to modify
                 * it. The solution is for the hypervisor to initialise the
                 * field to zeroes, and for us to only ever allow events that
                 * have a cache selector of zero. The bank selector (bit 3) is
                 * irrelevant, as long as the rest of the value is 0.
                 */
                if (cache & 0x7)
                        return -1;

        } else if (event & EVENT_IS_L1) {
                mask  |= CNST_L1_QUAL_MASK;
                value |= CNST_L1_QUAL_VAL(cache);
        }

        if (is_event_marked(event)) {
                mask  |= CNST_SAMPLE_MASK;
                value |= CNST_SAMPLE_VAL(event >> EVENT_SAMPLE_SHIFT);
        }

        if (cpu_has_feature(CPU_FTR_ARCH_300))  {
                if (event_is_threshold(event) && is_thresh_cmp_valid(event)) {
                        mask  |= CNST_THRESH_MASK;
                        value |= CNST_THRESH_VAL(event >> EVENT_THRESH_SHIFT);
                }
        } else {
                /*
                 * Special case for PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC,
                 * the threshold control bits are used for the match value.
                 */
                if (event_is_fab_match(event)) {
                        mask  |= CNST_FAB_MATCH_MASK;
                        value |= CNST_FAB_MATCH_VAL(event >> EVENT_THR_CTL_SHIFT);
                } else {
                        if (!is_thresh_cmp_valid(event))
                                return -1;

                        mask  |= CNST_THRESH_MASK;
                        value |= CNST_THRESH_VAL(event >> EVENT_THRESH_SHIFT);
                }
        }

        if (!pmc && ebb)
                /* EBB events must specify the PMC */
                return -1;

        if (event & EVENT_WANTS_BHRB) {
                if (!ebb)
                        /* Only EBB events can request BHRB */
                        return -1;

                mask  |= CNST_IFM_MASK;
                value |= CNST_IFM_VAL(event >> EVENT_IFM_SHIFT);
        }

        /*
         * All events must agree on EBB, either all request it or none.
         * EBB events are pinned & exclusive, so this should never actually
         * hit, but we leave it as a fallback in case.
         */
        mask  |= CNST_EBB_VAL(ebb);
        value |= CNST_EBB_MASK;

        *maskp = mask;
        *valp = value;

        return 0;
}

int isa207_compute_mmcr(u64 event[], int n_ev,
                               unsigned int hwc[], unsigned long mmcr[],
                               struct perf_event *pevents[])
{
        unsigned long mmcra, mmcr1, mmcr2, unit, combine, psel, cache, val;
        unsigned int pmc, pmc_inuse;
        int i;

        pmc_inuse = 0;

        /* First pass to count resource use */
        for (i = 0; i < n_ev; ++i) {
                pmc = (event[i] >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
                if (pmc)
                        pmc_inuse |= 1 << pmc;
        }

        mmcra = mmcr1 = mmcr2 = 0;

        /* Second pass: assign PMCs, set all MMCR1 fields */
        for (i = 0; i < n_ev; ++i) {
                pmc     = (event[i] >> EVENT_PMC_SHIFT) & EVENT_PMC_MASK;
                unit    = (event[i] >> EVENT_UNIT_SHIFT) & EVENT_UNIT_MASK;
                combine = combine_from_event(event[i]);
                psel    =  event[i] & EVENT_PSEL_MASK;

                if (!pmc) {
                        for (pmc = 1; pmc <= 4; ++pmc) {
                                if (!(pmc_inuse & (1 << pmc)))
                                        break;
                        }

                        pmc_inuse |= 1 << pmc;
                }

                if (pmc <= 4) {
                        mmcr1 |= unit << MMCR1_UNIT_SHIFT(pmc);
                        mmcr1 |= combine << combine_shift(pmc);
                        mmcr1 |= psel << MMCR1_PMCSEL_SHIFT(pmc);
                }

                /* In continuous sampling mode, update SDAR on TLB miss */
                mmcra_sdar_mode(event[i], &mmcra);

                if (event[i] & EVENT_IS_L1) {
                        cache = event[i] >> EVENT_CACHE_SEL_SHIFT;
                        mmcr1 |= (cache & 1) << MMCR1_IC_QUAL_SHIFT;
                        cache >>= 1;
                        mmcr1 |= (cache & 1) << MMCR1_DC_QUAL_SHIFT;
                }

                if (is_event_marked(event[i])) {
                        mmcra |= MMCRA_SAMPLE_ENABLE;

                        val = (event[i] >> EVENT_SAMPLE_SHIFT) & EVENT_SAMPLE_MASK;
                        if (val) {
                                mmcra |= (val &  3) << MMCRA_SAMP_MODE_SHIFT;
                                mmcra |= (val >> 2) << MMCRA_SAMP_ELIG_SHIFT;
                        }
                }

                /*
                 * PM_MRK_FAB_RSP_MATCH and PM_MRK_FAB_RSP_MATCH_CYC,
                 * the threshold bits are used for the match value.
                 */
                if (!cpu_has_feature(CPU_FTR_ARCH_300) && event_is_fab_match(event[i])) {
                        mmcr1 |= ((event[i] >> EVENT_THR_CTL_SHIFT) &
                                  EVENT_THR_CTL_MASK) << MMCR1_FAB_SHIFT;
                } else {
                        val = (event[i] >> EVENT_THR_CTL_SHIFT) & EVENT_THR_CTL_MASK;
                        mmcra |= val << MMCRA_THR_CTL_SHIFT;
                        val = (event[i] >> EVENT_THR_SEL_SHIFT) & EVENT_THR_SEL_MASK;
                        mmcra |= val << MMCRA_THR_SEL_SHIFT;
                        val = (event[i] >> EVENT_THR_CMP_SHIFT) & EVENT_THR_CMP_MASK;
                        mmcra |= thresh_cmp_val(val);
                }

                if (event[i] & EVENT_WANTS_BHRB) {
                        val = (event[i] >> EVENT_IFM_SHIFT) & EVENT_IFM_MASK;
                        mmcra |= val << MMCRA_IFM_SHIFT;
                }

                if (pevents[i]->attr.exclude_user)
                        mmcr2 |= MMCR2_FCP(pmc);

                if (pevents[i]->attr.exclude_hv)
                        mmcr2 |= MMCR2_FCH(pmc);

                if (pevents[i]->attr.exclude_kernel) {
                        if (cpu_has_feature(CPU_FTR_HVMODE))
                                mmcr2 |= MMCR2_FCH(pmc);
                        else
                                mmcr2 |= MMCR2_FCS(pmc);
                }

                hwc[i] = pmc - 1;
        }

        /* Return MMCRx values */
        mmcr[0] = 0;

        /* pmc_inuse is 1-based */
        if (pmc_inuse & 2)
                mmcr[0] = MMCR0_PMC1CE;

        if (pmc_inuse & 0x7c)
                mmcr[0] |= MMCR0_PMCjCE;

        /* If we're not using PMC 5 or 6, freeze them */
        if (!(pmc_inuse & 0x60))
                mmcr[0] |= MMCR0_FC56;

        mmcr[1] = mmcr1;
        mmcr[2] = mmcra;
        mmcr[3] = mmcr2;

        return 0;
}

void isa207_disable_pmc(unsigned int pmc, unsigned long mmcr[])
{
        if (pmc <= 3)
                mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SHIFT(pmc + 1));
}

static int find_alternative(u64 event, const unsigned int ev_alt[][MAX_ALT], int size)
{
        int i, j;

        for (i = 0; i < size; ++i) {
                if (event < ev_alt[i][0])
                        break;

                for (j = 0; j < MAX_ALT && ev_alt[i][j]; ++j)
                        if (event == ev_alt[i][j])
                                return i;
        }

        return -1;
}

int isa207_get_alternatives(u64 event, u64 alt[],
                                const unsigned int ev_alt[][MAX_ALT], int size)
{
        int i, j, num_alt = 0;
        u64 alt_event;

        alt[num_alt++] = event;
        i = find_alternative(event, ev_alt, size);
        if (i >= 0) {
                /* Filter out the original event, it's already in alt[0] */
                for (j = 0; j < MAX_ALT; ++j) {
                        alt_event = ev_alt[i][j];
                        if (alt_event && alt_event != event)
                                alt[num_alt++] = alt_event;
                }
        }

        return num_alt;
}