// SPDX-License-Identifier: GPL-2.0-only
#include <string.h>
#include "api/fs/fs.h"
#include "cputopo.h"
#include "smt.h"

bool smt_on(void)
{
        static bool cached;
        static bool cached_result;
        int fs_value;

        if (cached)
                return cached_result;

        if (sysfs__read_int("devices/system/cpu/smt/active", &fs_value) >= 0)
                cached_result = (fs_value == 1);
        else
                cached_result = cpu_topology__smt_on(online_topology());

        cached = true;
        return cached_result;
}

bool core_wide(bool system_wide, const char *user_requested_cpu_list)
{
        /* If not everything running on a core is being recorded then we can't use core_wide. */
        if (!system_wide)
                return false;

        /* Cheap case that SMT is disabled and therefore we're inherently core_wide. */
        if (!smt_on())
                return true;

        return cpu_topology__core_wide(online_topology(), user_requested_cpu_list);
}