// SPDX-License-Identifier: GPL-2.0
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/stringify.h>
#include "header.h"
#include "utils_header.h"
#include "metricgroup.h"
#include <api/fs/fs.h>
#include <sys/auxv.h>

static bool is_compat_mode(void)
{
        unsigned long base_platform = getauxval(AT_BASE_PLATFORM);
        unsigned long platform = getauxval(AT_PLATFORM);

        if (!strcmp((char *)platform, (char *)base_platform))
                return false;

        return true;
}

int
get_cpuid(char *buffer, size_t sz, struct perf_cpu cpu __maybe_unused)
{
        unsigned long pvr;
        int nb;

        pvr = mfspr(SPRN_PVR);

        nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr));

        /* look for end marker to ensure the entire data fit */
        if (strchr(buffer, '$')) {
                buffer[nb-1] = '\0';
                return 0;
        }
        return ENOBUFS;
}

char *
get_cpuid_str(struct perf_cpu cpu __maybe_unused)
{
        char *bufp;
        unsigned long pvr;

        /*
         * IBM Power System supports compatible mode. That is
         * Nth generation platform can support previous generation
         * OS in a mode called compatibile mode. For ex. LPAR can be
         * booted in a Power9 mode when the system is a Power10.
         *
         * In the compatible mode, care must be taken when generating
         * PVR value. When read, PVR will be of the AT_BASE_PLATFORM
         * To support generic events, return 0x00ffffff as pvr when
         * booted in compat mode. Based on this pvr value, json will
         * pick events from pmu-events/arch/powerpc/compat
         */
        if (!is_compat_mode())
                pvr = mfspr(SPRN_PVR);
        else
                pvr = 0x00ffffff;

        if (asprintf(&bufp, "0x%.8lx", pvr) < 0)
                bufp = NULL;

        return bufp;
}

int arch_get_runtimeparam(const struct pmu_metric *pm)
{
        int count;
        char path[PATH_MAX] = "/devices/hv_24x7/interface/";

        strcat(path, pm->aggr_mode == PerChip ? "sockets" : "coresperchip");
        return sysfs__read_int(path, &count) < 0 ? 1 : count;
}