// SPDX-License-Identifier: GPL-2.0-only
/*
 * POWER Data Stream Control Register (DSCR) sysfs interface test
 *
 * This test updates to system wide DSCR default through the sysfs interface
 * and then verifies that all the CPU specific DSCR defaults are updated as
 * well verified from their sysfs interfaces.
 *
 * Copyright 2015, Anshuman Khandual, IBM Corporation.
 */
#include "dscr.h"

static int check_cpu_dscr_default(char *file, unsigned long val)
{
        unsigned long cpu_dscr;
        int err;

        err = read_ulong(file, &cpu_dscr, 16);
        if (err)
                return err;

        if (cpu_dscr != val) {
                printf("DSCR match failed: %ld (system) %ld (cpu)\n",
                                        val, cpu_dscr);
                return 1;
        }
        return 0;
}

static int check_all_cpu_dscr_defaults(unsigned long val)
{
        DIR *sysfs;
        struct dirent *dp;
        char file[LEN_MAX];

        sysfs = opendir(CPU_PATH);
        if (!sysfs) {
                perror("opendir() failed");
                return 1;
        }

        while ((dp = readdir(sysfs))) {
                int len;

                if (!(dp->d_type & DT_DIR))
                        continue;
                if (!strcmp(dp->d_name, "cpuidle"))
                        continue;
                if (!strstr(dp->d_name, "cpu"))
                        continue;

                len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
                if (len >= LEN_MAX)
                        continue;
                if (access(file, F_OK))
                        continue;

                if (check_cpu_dscr_default(file, val)) {
                        closedir(sysfs);
                        return 1;
                }
        }
        closedir(sysfs);
        return 0;
}

int dscr_sysfs(void)
{
        unsigned long orig_dscr_default;

        SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));

        orig_dscr_default = get_default_dscr();
        for (int i = 0; i < DSCR_MAX; i++) {
                set_default_dscr(i);
                if (check_all_cpu_dscr_defaults(i))
                        goto fail;
        }
        set_default_dscr(orig_dscr_default);
        return 0;
fail:
        set_default_dscr(orig_dscr_default);
        return 1;
}

int main(int argc, char *argv[])
{
        return test_harness(dscr_sysfs, "dscr_sysfs_test");
}