// SPDX-License-Identifier: GPL-2.0-only
/*
 * POWER Data Stream Control Register (DSCR) SPR test
 *
 * This test modifies the DSCR value through both the SPR number
 * based mtspr instruction and then makes sure that the same is
 * reflected through mfspr instruction using either of the SPR
 * numbers.
 *
 * When using the privilege state SPR, the instructions such as
 * mfspr or mtspr are privileged and the kernel emulates them
 * for us. Instructions using problem state SPR can be executed
 * directly without any emulation if the HW supports them. Else
 * they also get emulated by the kernel.
 *
 * Copyright 2013, Anton Blanchard, IBM Corporation.
 * Copyright 2015, Anshuman Khandual, IBM Corporation.
 */
#include "dscr.h"

static int check_dscr(char *str)
{
        unsigned long cur_dscr, cur_dscr_usr;

        cur_dscr = get_dscr();
        cur_dscr_usr = get_dscr_usr();
        if (cur_dscr != cur_dscr_usr) {
                printf("%s set, kernel get %lx != user get %lx\n",
                                        str, cur_dscr, cur_dscr_usr);
                return 1;
        }
        return 0;
}

int dscr_user(void)
{
        int i;

        SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));

        check_dscr("");

        for (i = 0; i < COUNT; i++) {
                set_dscr(i);
                if (check_dscr("kernel"))
                        return 1;
        }

        for (i = 0; i < COUNT; i++) {
                set_dscr_usr(i);
                if (check_dscr("user"))
                        return 1;
        }
        return 0;
}

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