// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright(C) 2015 Linaro Limited. All rights reserved.
 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
 */

#include <linux/bitfield.h>
#include <linux/coresight.h>
#include <linux/pid_namespace.h>
#include <linux/pm_runtime.h>
#include <linux/sysfs.h>
#include "coresight-etm4x.h"
#include "coresight-priv.h"
#include "coresight-syscfg.h"

static int etm4_set_mode_exclude(struct etmv4_drvdata *drvdata, bool exclude)
{
        u8 idx;
        struct etmv4_config *config = &drvdata->config;

        idx = config->addr_idx;

        /*
         * TRCACATRn.TYPE bit[1:0]: type of comparison
         * the trace unit performs
         */
        if (FIELD_GET(TRCACATRn_TYPE_MASK, config->addr_acc[idx]) == TRCACATRn_TYPE_ADDR) {
                if (idx % 2 != 0)
                        return -EINVAL;

                /*
                 * We are performing instruction address comparison. Set the
                 * relevant bit of ViewInst Include/Exclude Control register
                 * for corresponding address comparator pair.
                 */
                if (config->addr_type[idx] != ETM_ADDR_TYPE_RANGE ||
                    config->addr_type[idx + 1] != ETM_ADDR_TYPE_RANGE)
                        return -EINVAL;

                if (exclude == true) {
                        /*
                         * Set exclude bit and unset the include bit
                         * corresponding to comparator pair
                         */
                        config->viiectlr |= BIT(idx / 2 + 16);
                        config->viiectlr &= ~BIT(idx / 2);
                } else {
                        /*
                         * Set include bit and unset exclude bit
                         * corresponding to comparator pair
                         */
                        config->viiectlr |= BIT(idx / 2);
                        config->viiectlr &= ~BIT(idx / 2 + 16);
                }
        }
        return 0;
}

static ssize_t nr_pe_cmp_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nr_pe_cmp;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nr_pe_cmp);

static ssize_t nr_addr_cmp_show(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nr_addr_cmp;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nr_addr_cmp);

static ssize_t nr_cntr_show(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nr_cntr;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nr_cntr);

static ssize_t nr_ext_inp_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nr_ext_inp;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nr_ext_inp);

static ssize_t numcidc_show(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->numcidc;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(numcidc);

static ssize_t numvmidc_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->numvmidc;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(numvmidc);

static ssize_t nrseqstate_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nrseqstate;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nrseqstate);

static ssize_t nr_resource_show(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nr_resource;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nr_resource);

static ssize_t nr_ss_cmp_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->nr_ss_cmp;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(nr_ss_cmp);

static ssize_t reset_store(struct device *dev,
                           struct device_attribute *attr,
                           const char *buf, size_t size)
{
        int i;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        if (val)
                config->mode = 0x0;

        /* Disable data tracing: do not trace load and store data transfers */
        config->mode &= ~(ETM_MODE_LOAD | ETM_MODE_STORE);
        config->cfg &= ~(TRCCONFIGR_INSTP0_LOAD | TRCCONFIGR_INSTP0_STORE);

        /* Disable data value and data address tracing */
        config->mode &= ~(ETM_MODE_DATA_TRACE_ADDR |
                           ETM_MODE_DATA_TRACE_VAL);
        config->cfg &= ~(TRCCONFIGR_DA | TRCCONFIGR_DV);

        /* Disable all events tracing */
        config->eventctrl0 = 0x0;
        config->eventctrl1 = 0x0;

        /* Disable timestamp event */
        config->ts_ctrl = 0x0;

        /* Disable stalling */
        config->stall_ctrl = 0x0;

        /* Reset trace synchronization period  to 2^8 = 256 bytes*/
        if (drvdata->syncpr == false)
                config->syncfreq = 0x8;

        /*
         * Enable ViewInst to trace everything with start-stop logic in
         * started state. ARM recommends start-stop logic is set before
         * each trace run.
         */
        config->vinst_ctrl = FIELD_PREP(TRCVICTLR_EVENT_MASK, 0x01);
        if (drvdata->nr_addr_cmp > 0) {
                config->mode |= ETM_MODE_VIEWINST_STARTSTOP;
                /* SSSTATUS, bit[9] */
                config->vinst_ctrl |= TRCVICTLR_SSSTATUS;
        }

        /* No address range filtering for ViewInst */
        config->viiectlr = 0x0;

        /* No start-stop filtering for ViewInst */
        config->vissctlr = 0x0;
        config->vipcssctlr = 0x0;

        /* Disable seq events */
        for (i = 0; i < drvdata->nrseqstate-1; i++)
                config->seq_ctrl[i] = 0x0;
        config->seq_rst = 0x0;
        config->seq_state = 0x0;

        /* Disable external input events */
        config->ext_inp = 0x0;

        config->cntr_idx = 0x0;
        for (i = 0; i < drvdata->nr_cntr; i++) {
                config->cntrldvr[i] = 0x0;
                config->cntr_ctrl[i] = 0x0;
                config->cntr_val[i] = 0x0;
        }

        config->res_idx = 0x0;
        for (i = 2; i < 2 * drvdata->nr_resource; i++)
                config->res_ctrl[i] = 0x0;

        config->ss_idx = 0x0;
        for (i = 0; i < drvdata->nr_ss_cmp; i++) {
                config->ss_ctrl[i] = 0x0;
                config->ss_pe_cmp[i] = 0x0;
        }

        config->addr_idx = 0x0;
        for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
                config->addr_val[i] = 0x0;
                config->addr_acc[i] = 0x0;
                config->addr_type[i] = ETM_ADDR_TYPE_NONE;
        }

        config->ctxid_idx = 0x0;
        for (i = 0; i < drvdata->numcidc; i++)
                config->ctxid_pid[i] = 0x0;

        config->ctxid_mask0 = 0x0;
        config->ctxid_mask1 = 0x0;

        config->vmid_idx = 0x0;
        for (i = 0; i < drvdata->numvmidc; i++)
                config->vmid_val[i] = 0x0;
        config->vmid_mask0 = 0x0;
        config->vmid_mask1 = 0x0;

        raw_spin_unlock(&drvdata->spinlock);

        /* for sysfs - only release trace id when resetting */
        etm4_release_trace_id(drvdata);

        cscfg_csdev_reset_feats(to_coresight_device(dev));

        return size;
}
static DEVICE_ATTR_WO(reset);

static ssize_t mode_show(struct device *dev,
                         struct device_attribute *attr,
                         char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->mode;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t mode_store(struct device *dev,
                          struct device_attribute *attr,
                          const char *buf, size_t size)
{
        unsigned long val, mode;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        config->mode = val & ETMv4_MODE_ALL;

        if (drvdata->instrp0 == true) {
                /* start by clearing instruction P0 field */
                config->cfg  &= ~TRCCONFIGR_INSTP0_LOAD_STORE;
                if (config->mode & ETM_MODE_LOAD)
                        /* 0b01 Trace load instructions as P0 instructions */
                        config->cfg  |= TRCCONFIGR_INSTP0_LOAD;
                if (config->mode & ETM_MODE_STORE)
                        /* 0b10 Trace store instructions as P0 instructions */
                        config->cfg  |= TRCCONFIGR_INSTP0_STORE;
                if (config->mode & ETM_MODE_LOAD_STORE)
                        /*
                         * 0b11 Trace load and store instructions
                         * as P0 instructions
                         */
                        config->cfg  |= TRCCONFIGR_INSTP0_LOAD_STORE;
        }

        /* bit[3], Branch broadcast mode */
        if ((config->mode & ETM_MODE_BB) && (drvdata->trcbb == true))
                config->cfg |= TRCCONFIGR_BB;
        else
                config->cfg &= ~TRCCONFIGR_BB;

        /* bit[4], Cycle counting instruction trace bit */
        if ((config->mode & ETMv4_MODE_CYCACC) &&
                (drvdata->trccci == true))
                config->cfg |= TRCCONFIGR_CCI;
        else
                config->cfg &= ~TRCCONFIGR_CCI;

        /* bit[6], Context ID tracing bit */
        if ((config->mode & ETMv4_MODE_CTXID) && (drvdata->ctxid_size))
                config->cfg |= TRCCONFIGR_CID;
        else
                config->cfg &= ~TRCCONFIGR_CID;

        if ((config->mode & ETM_MODE_VMID) && (drvdata->vmid_size))
                config->cfg |= TRCCONFIGR_VMID;
        else
                config->cfg &= ~TRCCONFIGR_VMID;

        /* bits[10:8], Conditional instruction tracing bit */
        mode = ETM_MODE_COND(config->mode);
        if (drvdata->trccond == true) {
                config->cfg &= ~TRCCONFIGR_COND_MASK;
                config->cfg |= mode << __bf_shf(TRCCONFIGR_COND_MASK);
        }

        /* bit[11], Global timestamp tracing bit */
        if ((config->mode & ETMv4_MODE_TIMESTAMP) && (drvdata->ts_size))
                config->cfg |= TRCCONFIGR_TS;
        else
                config->cfg &= ~TRCCONFIGR_TS;

        /* bit[12], Return stack enable bit */
        if ((config->mode & ETM_MODE_RETURNSTACK) &&
                                        (drvdata->retstack == true))
                config->cfg |= TRCCONFIGR_RS;
        else
                config->cfg &= ~TRCCONFIGR_RS;

        /* bits[14:13], Q element enable field */
        mode = ETM_MODE_QELEM(config->mode);
        /* start by clearing QE bits */
        config->cfg &= ~(TRCCONFIGR_QE_W_COUNTS | TRCCONFIGR_QE_WO_COUNTS);
        /*
         * if supported, Q elements with instruction counts are enabled.
         * Always set the low bit for any requested mode. Valid combos are
         * 0b00, 0b01 and 0b11.
         */
        if (mode && drvdata->q_support)
                config->cfg |= TRCCONFIGR_QE_W_COUNTS;
        /*
         * if supported, Q elements with and without instruction
         * counts are enabled
         */
        if ((mode & BIT(1)) && (drvdata->q_support & BIT(1)))
                config->cfg |= TRCCONFIGR_QE_WO_COUNTS;

        /* bit[11], AMBA Trace Bus (ATB) trigger enable bit */
        if ((config->mode & ETM_MODE_ATB_TRIGGER) &&
            (drvdata->atbtrig == true))
                config->eventctrl1 |= TRCEVENTCTL1R_ATB;
        else
                config->eventctrl1 &= ~TRCEVENTCTL1R_ATB;

        /* bit[12], Low-power state behavior override bit */
        if ((config->mode & ETM_MODE_LPOVERRIDE) &&
            (drvdata->lpoverride == true))
                config->eventctrl1 |= TRCEVENTCTL1R_LPOVERRIDE;
        else
                config->eventctrl1 &= ~TRCEVENTCTL1R_LPOVERRIDE;

        /* bit[8], Instruction stall bit */
        if ((config->mode & ETM_MODE_ISTALL_EN) && (drvdata->stallctl == true))
                config->stall_ctrl |= TRCSTALLCTLR_ISTALL;
        else
                config->stall_ctrl &= ~TRCSTALLCTLR_ISTALL;

        /* bit[10], Prioritize instruction trace bit */
        if (config->mode & ETM_MODE_INSTPRIO)
                config->stall_ctrl |= TRCSTALLCTLR_INSTPRIORITY;
        else
                config->stall_ctrl &= ~TRCSTALLCTLR_INSTPRIORITY;

        /* bit[13], Trace overflow prevention bit */
        if ((config->mode & ETM_MODE_NOOVERFLOW) &&
                (drvdata->nooverflow == true))
                config->stall_ctrl |= TRCSTALLCTLR_NOOVERFLOW;
        else
                config->stall_ctrl &= ~TRCSTALLCTLR_NOOVERFLOW;

        /* bit[9] Start/stop logic control bit */
        if (config->mode & ETM_MODE_VIEWINST_STARTSTOP)
                config->vinst_ctrl |= TRCVICTLR_SSSTATUS;
        else
                config->vinst_ctrl &= ~TRCVICTLR_SSSTATUS;

        /* bit[10], Whether a trace unit must trace a Reset exception */
        if (config->mode & ETM_MODE_TRACE_RESET)
                config->vinst_ctrl |= TRCVICTLR_TRCRESET;
        else
                config->vinst_ctrl &= ~TRCVICTLR_TRCRESET;

        /* bit[11], Whether a trace unit must trace a system error exception */
        if ((config->mode & ETM_MODE_TRACE_ERR) &&
                (drvdata->trc_error == true))
                config->vinst_ctrl |= TRCVICTLR_TRCERR;
        else
                config->vinst_ctrl &= ~TRCVICTLR_TRCERR;

        if (config->mode & (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER))
                etm4_config_trace_mode(config);

        raw_spin_unlock(&drvdata->spinlock);

        return size;
}
static DEVICE_ATTR_RW(mode);

static ssize_t pe_show(struct device *dev,
                       struct device_attribute *attr,
                       char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->pe_sel;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t pe_store(struct device *dev,
                        struct device_attribute *attr,
                        const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        if (val > drvdata->nr_pe) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EINVAL;
        }

        config->pe_sel = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(pe);

static ssize_t event_show(struct device *dev,
                          struct device_attribute *attr,
                          char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->eventctrl0;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t event_store(struct device *dev,
                           struct device_attribute *attr,
                           const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        switch (drvdata->nr_event) {
        case 0x0:
                /* EVENT0, bits[7:0] */
                config->eventctrl0 = val & 0xFF;
                break;
        case 0x1:
                 /* EVENT1, bits[15:8] */
                config->eventctrl0 = val & 0xFFFF;
                break;
        case 0x2:
                /* EVENT2, bits[23:16] */
                config->eventctrl0 = val & 0xFFFFFF;
                break;
        case 0x3:
                /* EVENT3, bits[31:24] */
                config->eventctrl0 = val;
                break;
        default:
                break;
        }
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(event);

static ssize_t event_instren_show(struct device *dev,
                                  struct device_attribute *attr,
                                  char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = FIELD_GET(TRCEVENTCTL1R_INSTEN_MASK, config->eventctrl1);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t event_instren_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        /* start by clearing all instruction event enable bits */
        config->eventctrl1 &= ~TRCEVENTCTL1R_INSTEN_MASK;
        switch (drvdata->nr_event) {
        case 0x0:
                /* generate Event element for event 1 */
                config->eventctrl1 |= val & TRCEVENTCTL1R_INSTEN_1;
                break;
        case 0x1:
                /* generate Event element for event 1 and 2 */
                config->eventctrl1 |= val & (TRCEVENTCTL1R_INSTEN_0 | TRCEVENTCTL1R_INSTEN_1);
                break;
        case 0x2:
                /* generate Event element for event 1, 2 and 3 */
                config->eventctrl1 |= val & (TRCEVENTCTL1R_INSTEN_0 |
                                             TRCEVENTCTL1R_INSTEN_1 |
                                             TRCEVENTCTL1R_INSTEN_2);
                break;
        case 0x3:
                /* generate Event element for all 4 events */
                config->eventctrl1 |= val & (TRCEVENTCTL1R_INSTEN_0 |
                                             TRCEVENTCTL1R_INSTEN_1 |
                                             TRCEVENTCTL1R_INSTEN_2 |
                                             TRCEVENTCTL1R_INSTEN_3);
                break;
        default:
                break;
        }
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(event_instren);

static ssize_t event_ts_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->ts_ctrl;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t event_ts_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (!drvdata->ts_size)
                return -EINVAL;

        config->ts_ctrl = val & ETMv4_EVENT_MASK;
        return size;
}
static DEVICE_ATTR_RW(event_ts);

static ssize_t syncfreq_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->syncfreq;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t syncfreq_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (drvdata->syncpr == true)
                return -EINVAL;

        config->syncfreq = val & ETMv4_SYNC_MASK;
        return size;
}
static DEVICE_ATTR_RW(syncfreq);

static ssize_t cyc_threshold_show(struct device *dev,
                                  struct device_attribute *attr,
                                  char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->ccctlr;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t cyc_threshold_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        /* mask off max threshold before checking min value */
        val &= ETM_CYC_THRESHOLD_MASK;
        if (val < drvdata->ccitmin)
                return -EINVAL;

        config->ccctlr = val;
        return size;
}
static DEVICE_ATTR_RW(cyc_threshold);

static ssize_t bb_ctrl_show(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->bb_ctrl;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t bb_ctrl_store(struct device *dev,
                             struct device_attribute *attr,
                             const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (drvdata->trcbb == false)
                return -EINVAL;
        if (!drvdata->nr_addr_cmp)
                return -EINVAL;

        /*
         * Bit[8] controls include(1) / exclude(0), bits[0-7] select
         * individual range comparators. If include then at least 1
         * range must be selected.
         */
        if ((val & TRCBBCTLR_MODE) && (FIELD_GET(TRCBBCTLR_RANGE_MASK, val) == 0))
                return -EINVAL;

        config->bb_ctrl = val & (TRCBBCTLR_MODE | TRCBBCTLR_RANGE_MASK);
        return size;
}
static DEVICE_ATTR_RW(bb_ctrl);

static ssize_t event_vinst_show(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = FIELD_GET(TRCVICTLR_EVENT_MASK, config->vinst_ctrl);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t event_vinst_store(struct device *dev,
                                 struct device_attribute *attr,
                                 const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        val &= TRCVICTLR_EVENT_MASK >> __bf_shf(TRCVICTLR_EVENT_MASK);
        config->vinst_ctrl &= ~TRCVICTLR_EVENT_MASK;
        config->vinst_ctrl |= FIELD_PREP(TRCVICTLR_EVENT_MASK, val);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(event_vinst);

static ssize_t s_exlevel_vinst_show(struct device *dev,
                                    struct device_attribute *attr,
                                    char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = FIELD_GET(TRCVICTLR_EXLEVEL_S_MASK, config->vinst_ctrl);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t s_exlevel_vinst_store(struct device *dev,
                                     struct device_attribute *attr,
                                     const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        /* clear all EXLEVEL_S bits  */
        config->vinst_ctrl &= ~TRCVICTLR_EXLEVEL_S_MASK;
        /* enable instruction tracing for corresponding exception level */
        val &= drvdata->s_ex_level;
        config->vinst_ctrl |= val << __bf_shf(TRCVICTLR_EXLEVEL_S_MASK);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(s_exlevel_vinst);

static ssize_t ns_exlevel_vinst_show(struct device *dev,
                                     struct device_attribute *attr,
                                     char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /* EXLEVEL_NS, bits[23:20] */
        val = FIELD_GET(TRCVICTLR_EXLEVEL_NS_MASK, config->vinst_ctrl);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t ns_exlevel_vinst_store(struct device *dev,
                                      struct device_attribute *attr,
                                      const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        /* clear EXLEVEL_NS bits  */
        config->vinst_ctrl &= ~TRCVICTLR_EXLEVEL_NS_MASK;
        /* enable instruction tracing for corresponding exception level */
        val &= drvdata->ns_ex_level;
        config->vinst_ctrl |= val << __bf_shf(TRCVICTLR_EXLEVEL_NS_MASK);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(ns_exlevel_vinst);

static ssize_t addr_idx_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->addr_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t addr_idx_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->nr_addr_cmp * 2)
                return -EINVAL;

        /*
         * Use spinlock to ensure index doesn't change while it gets
         * dereferenced multiple times within a spinlock block elsewhere.
         */
        raw_spin_lock(&drvdata->spinlock);
        config->addr_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_idx);

static ssize_t addr_instdatatype_show(struct device *dev,
                                      struct device_attribute *attr,
                                      char *buf)
{
        ssize_t len;
        u8 val, idx;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        val = FIELD_GET(TRCACATRn_TYPE_MASK, config->addr_acc[idx]);
        len = scnprintf(buf, PAGE_SIZE, "%s\n",
                        val == TRCACATRn_TYPE_ADDR ? "instr" :
                        (val == TRCACATRn_TYPE_DATA_LOAD_ADDR ? "data_load" :
                        (val == TRCACATRn_TYPE_DATA_STORE_ADDR ? "data_store" :
                        "data_load_store")));
        raw_spin_unlock(&drvdata->spinlock);
        return len;
}

static ssize_t addr_instdatatype_store(struct device *dev,
                                       struct device_attribute *attr,
                                       const char *buf, size_t size)
{
        u8 idx;
        char str[20] = "";
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (strlen(buf) >= 20)
                return -EINVAL;
        if (sscanf(buf, "%s", str) != 1)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (!strcmp(str, "instr"))
                /* TYPE, bits[1:0] */
                config->addr_acc[idx] &= ~TRCACATRn_TYPE_MASK;

        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_instdatatype);

static ssize_t addr_single_show(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        idx = config->addr_idx;
        raw_spin_lock(&drvdata->spinlock);
        if (!(config->addr_type[idx] == ETM_ADDR_TYPE_NONE ||
              config->addr_type[idx] == ETM_ADDR_TYPE_SINGLE)) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }
        val = (unsigned long)config->addr_val[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t addr_single_store(struct device *dev,
                                 struct device_attribute *attr,
                                 const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (!(config->addr_type[idx] == ETM_ADDR_TYPE_NONE ||
              config->addr_type[idx] == ETM_ADDR_TYPE_SINGLE)) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        config->addr_val[idx] = (u64)val;
        config->addr_type[idx] = ETM_ADDR_TYPE_SINGLE;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_single);

static ssize_t addr_range_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        u8 idx;
        unsigned long val1, val2;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (idx % 2 != 0) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }
        if (!((config->addr_type[idx] == ETM_ADDR_TYPE_NONE &&
               config->addr_type[idx + 1] == ETM_ADDR_TYPE_NONE) ||
              (config->addr_type[idx] == ETM_ADDR_TYPE_RANGE &&
               config->addr_type[idx + 1] == ETM_ADDR_TYPE_RANGE))) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        val1 = (unsigned long)config->addr_val[idx];
        val2 = (unsigned long)config->addr_val[idx + 1];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2);
}

static ssize_t addr_range_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t size)
{
        u8 idx;
        unsigned long val1, val2;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;
        int elements, exclude;

        elements = sscanf(buf, "%lx %lx %x", &val1, &val2, &exclude);

        /*  exclude is optional, but need at least two parameter */
        if (elements < 2)
                return -EINVAL;
        /* lower address comparator cannot have a higher address value */
        if (val1 > val2)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (idx % 2 != 0) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        if (!((config->addr_type[idx] == ETM_ADDR_TYPE_NONE &&
               config->addr_type[idx + 1] == ETM_ADDR_TYPE_NONE) ||
              (config->addr_type[idx] == ETM_ADDR_TYPE_RANGE &&
               config->addr_type[idx + 1] == ETM_ADDR_TYPE_RANGE))) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        config->addr_val[idx] = (u64)val1;
        config->addr_type[idx] = ETM_ADDR_TYPE_RANGE;
        config->addr_val[idx + 1] = (u64)val2;
        config->addr_type[idx + 1] = ETM_ADDR_TYPE_RANGE;
        /*
         * Program include or exclude control bits for vinst or vdata
         * whenever we change addr comparators to ETM_ADDR_TYPE_RANGE
         * use supplied value, or default to bit set in 'mode'
         */
        if (elements != 3)
                exclude = config->mode & ETM_MODE_EXCLUDE;
        etm4_set_mode_exclude(drvdata, exclude ? true : false);

        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_range);

static ssize_t addr_start_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;

        if (!(config->addr_type[idx] == ETM_ADDR_TYPE_NONE ||
              config->addr_type[idx] == ETM_ADDR_TYPE_START)) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        val = (unsigned long)config->addr_val[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t addr_start_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (!drvdata->nr_addr_cmp) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EINVAL;
        }
        if (!(config->addr_type[idx] == ETM_ADDR_TYPE_NONE ||
              config->addr_type[idx] == ETM_ADDR_TYPE_START)) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        config->addr_val[idx] = (u64)val;
        config->addr_type[idx] = ETM_ADDR_TYPE_START;
        config->vissctlr |= BIT(idx);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_start);

static ssize_t addr_stop_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;

        if (!(config->addr_type[idx] == ETM_ADDR_TYPE_NONE ||
              config->addr_type[idx] == ETM_ADDR_TYPE_STOP)) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        val = (unsigned long)config->addr_val[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t addr_stop_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (!drvdata->nr_addr_cmp) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EINVAL;
        }
        if (!(config->addr_type[idx] == ETM_ADDR_TYPE_NONE ||
               config->addr_type[idx] == ETM_ADDR_TYPE_STOP)) {
                raw_spin_unlock(&drvdata->spinlock);
                return -EPERM;
        }

        config->addr_val[idx] = (u64)val;
        config->addr_type[idx] = ETM_ADDR_TYPE_STOP;
        config->vissctlr |= BIT(idx + 16);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_stop);

static ssize_t addr_ctxtype_show(struct device *dev,
                                 struct device_attribute *attr,
                                 char *buf)
{
        ssize_t len;
        u8 idx, val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        /* CONTEXTTYPE, bits[3:2] */
        val = FIELD_GET(TRCACATRn_CONTEXTTYPE_MASK, config->addr_acc[idx]);
        len = scnprintf(buf, PAGE_SIZE, "%s\n", val == ETM_CTX_NONE ? "none" :
                        (val == ETM_CTX_CTXID ? "ctxid" :
                        (val == ETM_CTX_VMID ? "vmid" : "all")));
        raw_spin_unlock(&drvdata->spinlock);
        return len;
}

static ssize_t addr_ctxtype_store(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t size)
{
        u8 idx;
        char str[10] = "";
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (strlen(buf) >= 10)
                return -EINVAL;
        if (sscanf(buf, "%s", str) != 1)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        if (!strcmp(str, "none"))
                /* start by clearing context type bits */
                config->addr_acc[idx] &= ~TRCACATRn_CONTEXTTYPE_MASK;
        else if (!strcmp(str, "ctxid")) {
                /* 0b01 The trace unit performs a Context ID */
                if (drvdata->numcidc) {
                        config->addr_acc[idx] |= TRCACATRn_CONTEXTTYPE_CTXID;
                        config->addr_acc[idx] &= ~TRCACATRn_CONTEXTTYPE_VMID;
                }
        } else if (!strcmp(str, "vmid")) {
                /* 0b10 The trace unit performs a VMID */
                if (drvdata->numvmidc) {
                        config->addr_acc[idx] &= ~TRCACATRn_CONTEXTTYPE_CTXID;
                        config->addr_acc[idx] |= TRCACATRn_CONTEXTTYPE_VMID;
                }
        } else if (!strcmp(str, "all")) {
                /*
                 * 0b11 The trace unit performs a Context ID
                 * comparison and a VMID
                 */
                if (drvdata->numcidc)
                        config->addr_acc[idx] |= TRCACATRn_CONTEXTTYPE_CTXID;
                if (drvdata->numvmidc)
                        config->addr_acc[idx] |= TRCACATRn_CONTEXTTYPE_VMID;
        }
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_ctxtype);

static ssize_t addr_context_show(struct device *dev,
                                 struct device_attribute *attr,
                                 char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        /* context ID comparator bits[6:4] */
        val = FIELD_GET(TRCACATRn_CONTEXT_MASK, config->addr_acc[idx]);
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t addr_context_store(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if ((drvdata->numcidc <= 1) && (drvdata->numvmidc <= 1))
                return -EINVAL;
        if (val >=  (drvdata->numcidc >= drvdata->numvmidc ?
                     drvdata->numcidc : drvdata->numvmidc))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        /* clear context ID comparator bits[6:4] */
        config->addr_acc[idx] &= ~TRCACATRn_CONTEXT_MASK;
        config->addr_acc[idx] |= val << __bf_shf(TRCACATRn_CONTEXT_MASK);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_context);

static ssize_t addr_exlevel_s_ns_show(struct device *dev,
                                      struct device_attribute *attr,
                                      char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        val = FIELD_GET(TRCACATRn_EXLEVEL_MASK, config->addr_acc[idx]);
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t addr_exlevel_s_ns_store(struct device *dev,
                                       struct device_attribute *attr,
                                       const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 0, &val))
                return -EINVAL;

        if (val & ~(TRCACATRn_EXLEVEL_MASK >> __bf_shf(TRCACATRn_EXLEVEL_MASK)))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        /* clear Exlevel_ns & Exlevel_s bits[14:12, 11:8], bit[15] is res0 */
        config->addr_acc[idx] &= ~TRCACATRn_EXLEVEL_MASK;
        config->addr_acc[idx] |= val << __bf_shf(TRCACATRn_EXLEVEL_MASK);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(addr_exlevel_s_ns);

static const char * const addr_type_names[] = {
        "unused",
        "single",
        "range",
        "start",
        "stop"
};

static ssize_t addr_cmp_view_show(struct device *dev,
                                  struct device_attribute *attr, char *buf)
{
        u8 idx, addr_type;
        unsigned long addr_v, addr_v2, addr_ctrl;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;
        int size = 0;
        bool exclude = false;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->addr_idx;
        addr_v = config->addr_val[idx];
        addr_ctrl = config->addr_acc[idx];
        addr_type = config->addr_type[idx];
        if (addr_type == ETM_ADDR_TYPE_RANGE) {
                if (idx & 0x1) {
                        idx -= 1;
                        addr_v2 = addr_v;
                        addr_v = config->addr_val[idx];
                } else {
                        addr_v2 = config->addr_val[idx + 1];
                }
                exclude = config->viiectlr & BIT(idx / 2 + 16);
        }
        raw_spin_unlock(&drvdata->spinlock);
        if (addr_type) {
                size = scnprintf(buf, PAGE_SIZE, "addr_cmp[%i] %s %#lx", idx,
                                 addr_type_names[addr_type], addr_v);
                if (addr_type == ETM_ADDR_TYPE_RANGE) {
                        size += scnprintf(buf + size, PAGE_SIZE - size,
                                          " %#lx %s", addr_v2,
                                          exclude ? "exclude" : "include");
                }
                size += scnprintf(buf + size, PAGE_SIZE - size,
                                  " ctrl(%#lx)\n", addr_ctrl);
        } else {
                size = scnprintf(buf, PAGE_SIZE, "addr_cmp[%i] unused\n", idx);
        }
        return size;
}
static DEVICE_ATTR_RO(addr_cmp_view);

static ssize_t vinst_pe_cmp_start_stop_show(struct device *dev,
                                            struct device_attribute *attr,
                                            char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (!drvdata->nr_pe_cmp)
                return -EINVAL;
        val = config->vipcssctlr;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t vinst_pe_cmp_start_stop_store(struct device *dev,
                                             struct device_attribute *attr,
                                             const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (!drvdata->nr_pe_cmp)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        config->vipcssctlr = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(vinst_pe_cmp_start_stop);

static ssize_t seq_idx_show(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->seq_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t seq_idx_store(struct device *dev,
                             struct device_attribute *attr,
                             const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->nrseqstate - 1)
                return -EINVAL;

        /*
         * Use spinlock to ensure index doesn't change while it gets
         * dereferenced multiple times within a spinlock block elsewhere.
         */
        raw_spin_lock(&drvdata->spinlock);
        config->seq_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(seq_idx);

static ssize_t seq_state_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->seq_state;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t seq_state_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->nrseqstate)
                return -EINVAL;

        config->seq_state = val;
        return size;
}
static DEVICE_ATTR_RW(seq_state);

static ssize_t seq_event_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->seq_idx;
        val = config->seq_ctrl[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t seq_event_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->seq_idx;
        /* Seq control has two masks B[15:8] F[7:0] */
        config->seq_ctrl[idx] = val & 0xFFFF;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(seq_event);

static ssize_t seq_reset_event_show(struct device *dev,
                                    struct device_attribute *attr,
                                    char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->seq_rst;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t seq_reset_event_store(struct device *dev,
                                     struct device_attribute *attr,
                                     const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (!(drvdata->nrseqstate))
                return -EINVAL;

        config->seq_rst = val & ETMv4_EVENT_MASK;
        return size;
}
static DEVICE_ATTR_RW(seq_reset_event);

static ssize_t cntr_idx_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->cntr_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t cntr_idx_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->nr_cntr)
                return -EINVAL;

        /*
         * Use spinlock to ensure index doesn't change while it gets
         * dereferenced multiple times within a spinlock block elsewhere.
         */
        raw_spin_lock(&drvdata->spinlock);
        config->cntr_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(cntr_idx);

static ssize_t cntrldvr_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->cntr_idx;
        val = config->cntrldvr[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t cntrldvr_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val > ETM_CNTR_MAX_VAL)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->cntr_idx;
        config->cntrldvr[idx] = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(cntrldvr);

static ssize_t cntr_val_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->cntr_idx;
        val = config->cntr_val[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t cntr_val_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val > ETM_CNTR_MAX_VAL)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->cntr_idx;
        config->cntr_val[idx] = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(cntr_val);

static ssize_t cntr_ctrl_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->cntr_idx;
        val = config->cntr_ctrl[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t cntr_ctrl_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->cntr_idx;
        config->cntr_ctrl[idx] = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(cntr_ctrl);

static ssize_t res_idx_show(struct device *dev,
                            struct device_attribute *attr,
                            char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->res_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t res_idx_store(struct device *dev,
                             struct device_attribute *attr,
                             const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        /*
         * Resource selector pair 0 is always implemented and reserved,
         * namely an idx with 0 and 1 is illegal.
         */
        if ((val < 2) || (val >= 2 * drvdata->nr_resource))
                return -EINVAL;

        /*
         * Use spinlock to ensure index doesn't change while it gets
         * dereferenced multiple times within a spinlock block elsewhere.
         */
        raw_spin_lock(&drvdata->spinlock);
        config->res_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(res_idx);

static ssize_t res_ctrl_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->res_idx;
        val = config->res_ctrl[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t res_ctrl_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->res_idx;
        /* For odd idx pair inversal bit is RES0 */
        if (idx % 2 != 0)
                /* PAIRINV, bit[21] */
                val &= ~TRCRSCTLRn_PAIRINV;
        config->res_ctrl[idx] = val & (TRCRSCTLRn_PAIRINV |
                                       TRCRSCTLRn_INV |
                                       TRCRSCTLRn_GROUP_MASK |
                                       TRCRSCTLRn_SELECT_MASK);
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(res_ctrl);

static ssize_t sshot_idx_show(struct device *dev,
                              struct device_attribute *attr, char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->ss_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t sshot_idx_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->nr_ss_cmp)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        config->ss_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(sshot_idx);

static ssize_t sshot_ctrl_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        val = config->ss_ctrl[config->ss_idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t sshot_ctrl_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->ss_idx;
        config->ss_ctrl[idx] = FIELD_PREP(TRCSSCCRn_SAC_ARC_RST_MASK, val);
        /* must clear bit 31 in related status register on programming */
        config->ss_status[idx] &= ~TRCSSCSRn_STATUS;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(sshot_ctrl);

static ssize_t sshot_status_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        val = config->ss_status[config->ss_idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static DEVICE_ATTR_RO(sshot_status);

static ssize_t sshot_pe_ctrl_show(struct device *dev,
                                  struct device_attribute *attr,
                                  char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        raw_spin_lock(&drvdata->spinlock);
        val = config->ss_pe_cmp[config->ss_idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t sshot_pe_ctrl_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t size)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->ss_idx;
        config->ss_pe_cmp[idx] = FIELD_PREP(TRCSSPCICRn_PC_MASK, val);
        /* must clear bit 31 in related status register on programming */
        config->ss_status[idx] &= ~TRCSSCSRn_STATUS;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(sshot_pe_ctrl);

static ssize_t ctxid_idx_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->ctxid_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t ctxid_idx_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->numcidc)
                return -EINVAL;

        /*
         * Use spinlock to ensure index doesn't change while it gets
         * dereferenced multiple times within a spinlock block elsewhere.
         */
        raw_spin_lock(&drvdata->spinlock);
        config->ctxid_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(ctxid_idx);

static ssize_t ctxid_pid_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        u8 idx;
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /*
         * Don't use contextID tracing if coming from a PID namespace.  See
         * comment in ctxid_pid_store().
         */
        if (task_active_pid_ns(current) != &init_pid_ns)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->ctxid_idx;
        val = (unsigned long)config->ctxid_pid[idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t ctxid_pid_store(struct device *dev,
                               struct device_attribute *attr,
                               const char *buf, size_t size)
{
        u8 idx;
        unsigned long pid;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /*
         * When contextID tracing is enabled the tracers will insert the
         * value found in the contextID register in the trace stream.  But if
         * a process is in a namespace the PID of that process as seen from the
         * namespace won't be what the kernel sees, something that makes the
         * feature confusing and can potentially leak kernel only information.
         * As such refuse to use the feature if @current is not in the initial
         * PID namespace.
         */
        if (task_active_pid_ns(current) != &init_pid_ns)
                return -EINVAL;

        /*
         * only implemented when ctxid tracing is enabled, i.e. at least one
         * ctxid comparator is implemented and ctxid is greater than 0 bits
         * in length
         */
        if (!drvdata->ctxid_size || !drvdata->numcidc)
                return -EINVAL;
        if (kstrtoul(buf, 16, &pid))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        idx = config->ctxid_idx;
        config->ctxid_pid[idx] = (u64)pid;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(ctxid_pid);

static ssize_t ctxid_masks_show(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{
        unsigned long val1, val2;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /*
         * Don't use contextID tracing if coming from a PID namespace.  See
         * comment in ctxid_pid_store().
         */
        if (task_active_pid_ns(current) != &init_pid_ns)
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        val1 = config->ctxid_mask0;
        val2 = config->ctxid_mask1;
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2);
}

static ssize_t ctxid_masks_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t size)
{
        u8 i, j, maskbyte;
        unsigned long val1, val2, mask;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;
        int nr_inputs;

        /*
         * Don't use contextID tracing if coming from a PID namespace.  See
         * comment in ctxid_pid_store().
         */
        if (task_active_pid_ns(current) != &init_pid_ns)
                return -EINVAL;

        /*
         * only implemented when ctxid tracing is enabled, i.e. at least one
         * ctxid comparator is implemented and ctxid is greater than 0 bits
         * in length
         */
        if (!drvdata->ctxid_size || !drvdata->numcidc)
                return -EINVAL;
        /* one mask if <= 4 comparators, two for up to 8 */
        nr_inputs = sscanf(buf, "%lx %lx", &val1, &val2);
        if ((drvdata->numcidc > 4) && (nr_inputs != 2))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        /*
         * each byte[0..3] controls mask value applied to ctxid
         * comparator[0..3]
         */
        switch (drvdata->numcidc) {
        case 0x1:
                /* COMP0, bits[7:0] */
                config->ctxid_mask0 = val1 & 0xFF;
                break;
        case 0x2:
                /* COMP1, bits[15:8] */
                config->ctxid_mask0 = val1 & 0xFFFF;
                break;
        case 0x3:
                /* COMP2, bits[23:16] */
                config->ctxid_mask0 = val1 & 0xFFFFFF;
                break;
        case 0x4:
                 /* COMP3, bits[31:24] */
                config->ctxid_mask0 = val1;
                break;
        case 0x5:
                /* COMP4, bits[7:0] */
                config->ctxid_mask0 = val1;
                config->ctxid_mask1 = val2 & 0xFF;
                break;
        case 0x6:
                /* COMP5, bits[15:8] */
                config->ctxid_mask0 = val1;
                config->ctxid_mask1 = val2 & 0xFFFF;
                break;
        case 0x7:
                /* COMP6, bits[23:16] */
                config->ctxid_mask0 = val1;
                config->ctxid_mask1 = val2 & 0xFFFFFF;
                break;
        case 0x8:
                /* COMP7, bits[31:24] */
                config->ctxid_mask0 = val1;
                config->ctxid_mask1 = val2;
                break;
        default:
                break;
        }
        /*
         * If software sets a mask bit to 1, it must program relevant byte
         * of ctxid comparator value 0x0, otherwise behavior is unpredictable.
         * For example, if bit[3] of ctxid_mask0 is 1, we must clear bits[31:24]
         * of ctxid comparator0 value (corresponding to byte 0) register.
         */
        mask = config->ctxid_mask0;
        for (i = 0; i < drvdata->numcidc; i++) {
                /* mask value of corresponding ctxid comparator */
                maskbyte = mask & ETMv4_EVENT_MASK;
                /*
                 * each bit corresponds to a byte of respective ctxid comparator
                 * value register
                 */
                for (j = 0; j < 8; j++) {
                        if (maskbyte & 1)
                                config->ctxid_pid[i] &= ~(0xFFUL << (j * 8));
                        maskbyte >>= 1;
                }
                /* Select the next ctxid comparator mask value */
                if (i == 3)
                        /* ctxid comparators[4-7] */
                        mask = config->ctxid_mask1;
                else
                        mask >>= 0x8;
        }

        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(ctxid_masks);

static ssize_t vmid_idx_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        val = config->vmid_idx;
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t vmid_idx_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        if (kstrtoul(buf, 16, &val))
                return -EINVAL;
        if (val >= drvdata->numvmidc)
                return -EINVAL;

        /*
         * Use spinlock to ensure index doesn't change while it gets
         * dereferenced multiple times within a spinlock block elsewhere.
         */
        raw_spin_lock(&drvdata->spinlock);
        config->vmid_idx = val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(vmid_idx);

static ssize_t vmid_val_show(struct device *dev,
                             struct device_attribute *attr,
                             char *buf)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /*
         * Don't use virtual contextID tracing if coming from a PID namespace.
         * See comment in ctxid_pid_store().
         */
        if (!task_is_in_init_pid_ns(current))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        val = (unsigned long)config->vmid_val[config->vmid_idx];
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}

static ssize_t vmid_val_store(struct device *dev,
                              struct device_attribute *attr,
                              const char *buf, size_t size)
{
        unsigned long val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /*
         * Don't use virtual contextID tracing if coming from a PID namespace.
         * See comment in ctxid_pid_store().
         */
        if (!task_is_in_init_pid_ns(current))
                return -EINVAL;

        /*
         * only implemented when vmid tracing is enabled, i.e. at least one
         * vmid comparator is implemented and at least 8 bit vmid size
         */
        if (!drvdata->vmid_size || !drvdata->numvmidc)
                return -EINVAL;
        if (kstrtoul(buf, 16, &val))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        config->vmid_val[config->vmid_idx] = (u64)val;
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(vmid_val);

static ssize_t vmid_masks_show(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        unsigned long val1, val2;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;

        /*
         * Don't use virtual contextID tracing if coming from a PID namespace.
         * See comment in ctxid_pid_store().
         */
        if (!task_is_in_init_pid_ns(current))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);
        val1 = config->vmid_mask0;
        val2 = config->vmid_mask1;
        raw_spin_unlock(&drvdata->spinlock);
        return scnprintf(buf, PAGE_SIZE, "%#lx %#lx\n", val1, val2);
}

static ssize_t vmid_masks_store(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t size)
{
        u8 i, j, maskbyte;
        unsigned long val1, val2, mask;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct etmv4_config *config = &drvdata->config;
        int nr_inputs;

        /*
         * Don't use virtual contextID tracing if coming from a PID namespace.
         * See comment in ctxid_pid_store().
         */
        if (!task_is_in_init_pid_ns(current))
                return -EINVAL;

        /*
         * only implemented when vmid tracing is enabled, i.e. at least one
         * vmid comparator is implemented and at least 8 bit vmid size
         */
        if (!drvdata->vmid_size || !drvdata->numvmidc)
                return -EINVAL;
        /* one mask if <= 4 comparators, two for up to 8 */
        nr_inputs = sscanf(buf, "%lx %lx", &val1, &val2);
        if ((drvdata->numvmidc > 4) && (nr_inputs != 2))
                return -EINVAL;

        raw_spin_lock(&drvdata->spinlock);

        /*
         * each byte[0..3] controls mask value applied to vmid
         * comparator[0..3]
         */
        switch (drvdata->numvmidc) {
        case 0x1:
                /* COMP0, bits[7:0] */
                config->vmid_mask0 = val1 & 0xFF;
                break;
        case 0x2:
                /* COMP1, bits[15:8] */
                config->vmid_mask0 = val1 & 0xFFFF;
                break;
        case 0x3:
                /* COMP2, bits[23:16] */
                config->vmid_mask0 = val1 & 0xFFFFFF;
                break;
        case 0x4:
                /* COMP3, bits[31:24] */
                config->vmid_mask0 = val1;
                break;
        case 0x5:
                /* COMP4, bits[7:0] */
                config->vmid_mask0 = val1;
                config->vmid_mask1 = val2 & 0xFF;
                break;
        case 0x6:
                /* COMP5, bits[15:8] */
                config->vmid_mask0 = val1;
                config->vmid_mask1 = val2 & 0xFFFF;
                break;
        case 0x7:
                /* COMP6, bits[23:16] */
                config->vmid_mask0 = val1;
                config->vmid_mask1 = val2 & 0xFFFFFF;
                break;
        case 0x8:
                /* COMP7, bits[31:24] */
                config->vmid_mask0 = val1;
                config->vmid_mask1 = val2;
                break;
        default:
                break;
        }

        /*
         * If software sets a mask bit to 1, it must program relevant byte
         * of vmid comparator value 0x0, otherwise behavior is unpredictable.
         * For example, if bit[3] of vmid_mask0 is 1, we must clear bits[31:24]
         * of vmid comparator0 value (corresponding to byte 0) register.
         */
        mask = config->vmid_mask0;
        for (i = 0; i < drvdata->numvmidc; i++) {
                /* mask value of corresponding vmid comparator */
                maskbyte = mask & ETMv4_EVENT_MASK;
                /*
                 * each bit corresponds to a byte of respective vmid comparator
                 * value register
                 */
                for (j = 0; j < 8; j++) {
                        if (maskbyte & 1)
                                config->vmid_val[i] &= ~(0xFFUL << (j * 8));
                        maskbyte >>= 1;
                }
                /* Select the next vmid comparator mask value */
                if (i == 3)
                        /* vmid comparators[4-7] */
                        mask = config->vmid_mask1;
                else
                        mask >>= 0x8;
        }
        raw_spin_unlock(&drvdata->spinlock);
        return size;
}
static DEVICE_ATTR_RW(vmid_masks);

static ssize_t cpu_show(struct device *dev,
                        struct device_attribute *attr, char *buf)
{
        int val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        val = drvdata->cpu;
        return scnprintf(buf, PAGE_SIZE, "%d\n", val);

}
static DEVICE_ATTR_RO(cpu);

static ssize_t ts_source_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
{
        int val;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        if (!drvdata->trfcr) {
                val = -1;
                goto out;
        }

        val = FIELD_GET(TRFCR_EL1_TS_MASK, drvdata->trfcr);
        switch (val) {
        case TRFCR_EL1_TS_VIRTUAL:
        case TRFCR_EL1_TS_GUEST_PHYSICAL:
        case TRFCR_EL1_TS_PHYSICAL:
                break;
        default:
                val = -1;
                break;
        }

out:
        return sysfs_emit(buf, "%d\n", val);
}
static DEVICE_ATTR_RO(ts_source);

static struct attribute *coresight_etmv4_attrs[] = {
        &dev_attr_nr_pe_cmp.attr,
        &dev_attr_nr_addr_cmp.attr,
        &dev_attr_nr_cntr.attr,
        &dev_attr_nr_ext_inp.attr,
        &dev_attr_numcidc.attr,
        &dev_attr_numvmidc.attr,
        &dev_attr_nrseqstate.attr,
        &dev_attr_nr_resource.attr,
        &dev_attr_nr_ss_cmp.attr,
        &dev_attr_reset.attr,
        &dev_attr_mode.attr,
        &dev_attr_pe.attr,
        &dev_attr_event.attr,
        &dev_attr_event_instren.attr,
        &dev_attr_event_ts.attr,
        &dev_attr_syncfreq.attr,
        &dev_attr_cyc_threshold.attr,
        &dev_attr_bb_ctrl.attr,
        &dev_attr_event_vinst.attr,
        &dev_attr_s_exlevel_vinst.attr,
        &dev_attr_ns_exlevel_vinst.attr,
        &dev_attr_addr_idx.attr,
        &dev_attr_addr_instdatatype.attr,
        &dev_attr_addr_single.attr,
        &dev_attr_addr_range.attr,
        &dev_attr_addr_start.attr,
        &dev_attr_addr_stop.attr,
        &dev_attr_addr_ctxtype.attr,
        &dev_attr_addr_context.attr,
        &dev_attr_addr_exlevel_s_ns.attr,
        &dev_attr_addr_cmp_view.attr,
        &dev_attr_vinst_pe_cmp_start_stop.attr,
        &dev_attr_sshot_idx.attr,
        &dev_attr_sshot_ctrl.attr,
        &dev_attr_sshot_pe_ctrl.attr,
        &dev_attr_sshot_status.attr,
        &dev_attr_seq_idx.attr,
        &dev_attr_seq_state.attr,
        &dev_attr_seq_event.attr,
        &dev_attr_seq_reset_event.attr,
        &dev_attr_cntr_idx.attr,
        &dev_attr_cntrldvr.attr,
        &dev_attr_cntr_val.attr,
        &dev_attr_cntr_ctrl.attr,
        &dev_attr_res_idx.attr,
        &dev_attr_res_ctrl.attr,
        &dev_attr_ctxid_idx.attr,
        &dev_attr_ctxid_pid.attr,
        &dev_attr_ctxid_masks.attr,
        &dev_attr_vmid_idx.attr,
        &dev_attr_vmid_val.attr,
        &dev_attr_vmid_masks.attr,
        &dev_attr_cpu.attr,
        &dev_attr_ts_source.attr,
        NULL,
};

/*
 * Trace ID allocated dynamically on enable - but also allocate on read
 * in case sysfs or perf read before enable to ensure consistent metadata
 * information for trace decode
 */
static ssize_t trctraceid_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        int trace_id = coresight_etm_get_trace_id(drvdata->csdev, CS_MODE_SYSFS, NULL);

        if (trace_id < 0)
                return trace_id;

        return sysfs_emit(buf, "0x%x\n", trace_id);
}

struct etmv4_reg {
        struct coresight_device *csdev;
        u32 offset;
        u32 data;
};

static void do_smp_cross_read(void *data)
{
        struct etmv4_reg *reg = data;

        reg->data = etm4x_relaxed_read32(&reg->csdev->access, reg->offset);
}

static u32 etmv4_cross_read(const struct etmv4_drvdata *drvdata, u32 offset)
{
        struct etmv4_reg reg;

        reg.offset = offset;
        reg.csdev = drvdata->csdev;

        /*
         * smp cross call ensures the CPU will be powered up before
         * accessing the ETMv4 trace core registers
         */
        smp_call_function_single(drvdata->cpu, do_smp_cross_read, &reg, 1);
        return reg.data;
}

static u32 coresight_etm4x_attr_to_offset(struct device_attribute *attr)
{
        struct dev_ext_attribute *eattr;

        eattr = container_of(attr, struct dev_ext_attribute, attr);
        return (u32)(unsigned long)eattr->var;
}

static ssize_t coresight_etm4x_reg_show(struct device *dev,
                                        struct device_attribute *d_attr,
                                        char *buf)
{
        u32 val, offset;
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);

        offset = coresight_etm4x_attr_to_offset(d_attr);

        pm_runtime_get_sync(dev->parent);
        val = etmv4_cross_read(drvdata, offset);
        pm_runtime_put_sync(dev->parent);

        return scnprintf(buf, PAGE_SIZE, "0x%x\n", val);
}

static bool
etm4x_register_implemented(struct etmv4_drvdata *drvdata, u32 offset)
{
        switch (offset) {
        ETM_COMMON_SYSREG_LIST_CASES
                /*
                 * Common registers to ETE & ETM4x accessible via system
                 * instructions are always implemented.
                 */
                return true;

        ETM4x_ONLY_SYSREG_LIST_CASES
                /*
                 * We only support etm4x and ete. So if the device is not
                 * ETE, it must be ETMv4x.
                 */
                return !etm4x_is_ete(drvdata);

        ETM4x_MMAP_LIST_CASES
                /*
                 * Registers accessible only via memory-mapped registers
                 * must not be accessed via system instructions.
                 * We cannot access the drvdata->csdev here, as this
                 * function is called during the device creation, via
                 * coresight_register() and the csdev is not initialized
                 * until that is done. So rely on the drvdata->base to
                 * detect if we have a memory mapped access.
                 * Also ETE doesn't implement memory mapped access, thus
                 * it is sufficient to check that we are using mmio.
                 */
                return !!drvdata->base;

        ETE_ONLY_SYSREG_LIST_CASES
                return etm4x_is_ete(drvdata);
        }

        return false;
}

/*
 * Hide the ETM4x registers that may not be available on the
 * hardware.
 * There are certain management registers unavailable via system
 * instructions. Make those sysfs attributes hidden on such
 * systems.
 */
static umode_t
coresight_etm4x_attr_reg_implemented(struct kobject *kobj,
                                     struct attribute *attr, int unused)
{
        struct device *dev = kobj_to_dev(kobj);
        struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
        struct device_attribute *d_attr;
        u32 offset;

        d_attr = container_of(attr, struct device_attribute, attr);
        offset = coresight_etm4x_attr_to_offset(d_attr);

        if (etm4x_register_implemented(drvdata, offset))
                return attr->mode;
        return 0;
}

/*
 * Macro to set an RO ext attribute with offset and show function.
 * Offset is used in mgmt group to ensure only correct registers for
 * the ETM / ETE variant are visible.
 */
#define coresight_etm4x_reg_showfn(name, offset, showfn) (      \
        &((struct dev_ext_attribute[]) {                        \
           {                                                    \
                __ATTR(name, 0444, showfn, NULL),               \
                (void *)(unsigned long)offset                   \
           }                                                    \
        })[0].attr.attr                                         \
        )

/* macro using the default coresight_etm4x_reg_show function */
#define coresight_etm4x_reg(name, offset)       \
        coresight_etm4x_reg_showfn(name, offset, coresight_etm4x_reg_show)

static struct attribute *coresight_etmv4_mgmt_attrs[] = {
        coresight_etm4x_reg(trcpdcr, TRCPDCR),
        coresight_etm4x_reg(trcpdsr, TRCPDSR),
        coresight_etm4x_reg(trclsr, TRCLSR),
        coresight_etm4x_reg(trcauthstatus, TRCAUTHSTATUS),
        coresight_etm4x_reg(trcdevid, TRCDEVID),
        coresight_etm4x_reg(trcdevtype, TRCDEVTYPE),
        coresight_etm4x_reg(trcpidr0, TRCPIDR0),
        coresight_etm4x_reg(trcpidr1, TRCPIDR1),
        coresight_etm4x_reg(trcpidr2, TRCPIDR2),
        coresight_etm4x_reg(trcpidr3, TRCPIDR3),
        coresight_etm4x_reg(trcoslsr, TRCOSLSR),
        coresight_etm4x_reg(trcconfig, TRCCONFIGR),
        coresight_etm4x_reg_showfn(trctraceid, TRCTRACEIDR, trctraceid_show),
        coresight_etm4x_reg(trcdevarch, TRCDEVARCH),
        NULL,
};

static struct attribute *coresight_etmv4_trcidr_attrs[] = {
        coresight_etm4x_reg(trcidr0, TRCIDR0),
        coresight_etm4x_reg(trcidr1, TRCIDR1),
        coresight_etm4x_reg(trcidr2, TRCIDR2),
        coresight_etm4x_reg(trcidr3, TRCIDR3),
        coresight_etm4x_reg(trcidr4, TRCIDR4),
        coresight_etm4x_reg(trcidr5, TRCIDR5),
        /* trcidr[6,7] are reserved */
        coresight_etm4x_reg(trcidr8, TRCIDR8),
        coresight_etm4x_reg(trcidr9, TRCIDR9),
        coresight_etm4x_reg(trcidr10, TRCIDR10),
        coresight_etm4x_reg(trcidr11, TRCIDR11),
        coresight_etm4x_reg(trcidr12, TRCIDR12),
        coresight_etm4x_reg(trcidr13, TRCIDR13),
        NULL,
};

static const struct attribute_group coresight_etmv4_group = {
        .attrs = coresight_etmv4_attrs,
};

static const struct attribute_group coresight_etmv4_mgmt_group = {
        .is_visible = coresight_etm4x_attr_reg_implemented,
        .attrs = coresight_etmv4_mgmt_attrs,
        .name = "mgmt",
};

static const struct attribute_group coresight_etmv4_trcidr_group = {
        .attrs = coresight_etmv4_trcidr_attrs,
        .name = "trcidr",
};

const struct attribute_group *coresight_etmv4_groups[] = {
        &coresight_etmv4_group,
        &coresight_etmv4_mgmt_group,
        &coresight_etmv4_trcidr_group,
        NULL,
};