Commit 2b6d6371 authored by Alex Bennée's avatar Alex Bennée
Browse files

tests/tcg/aarch64: add SVE iotcl test 



This is a fairly bare-bones test of setting the various vector sizes
for SVE which will only fail if the PR_SVE_SET_VL can't reduce the
user-space vector length by powers of 2.

However we will also be able to use it in a future test which
exercises the GDB stub.

Signed-off-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Tested-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200316172155.971-25-alex.bennee@linaro.org>
parent cf58773f

tests/tcg/aarch64/Makefile.target

+4 −0
Original line number Diff line number Diff line
@@ -47,6 +47,10 @@ ifneq ($(DOCKER_IMAGE)$(CROSS_CC_HAS_SVE),) 
AARCH64_TESTS += sysregs

sysregs: CFLAGS+=-march=armv8.1-a+sve



# SVE ioctl test

AARCH64_TESTS += sve-ioctls

sve-ioctls: CFLAGS+=-march=armv8.1-a+sve



ifneq ($(HAVE_GDB_BIN),)

GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py

tests/tcg/aarch64/sve-ioctls.c

0 → 100644
+70 −0
Original line number Diff line number Diff line 
/*

 * SVE ioctls tests

 *

 * Test the SVE width setting ioctls work and provide a base for

 * testing the gdbstub.

 *

 * Copyright (c) 2019 Linaro Ltd

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include <sys/prctl.h>

#include <asm/hwcap.h>

#include <stdio.h>

#include <sys/auxv.h>

#include <stdint.h>

#include <stdlib.h>



#ifndef HWCAP_CPUID

#define HWCAP_CPUID (1 << 11)

#endif



#define SVE_MAX_QUADS  (2048 / 128)

#define BYTES_PER_QUAD (128 / 8)



#define get_cpu_reg(id) ({                                      \

            unsigned long __val;                                \

            asm("mrs %0, "#id : "=r" (__val));                  \

            __val;                                              \

        })



static int do_sve_ioctl_test(void)

{

    int i, res, init_vq;



    res = prctl(PR_SVE_GET_VL, 0, 0, 0, 0);

    if (res < 0) {

        printf("FAILED to PR_SVE_GET_VL (%d)", res);

        return -1;

    }

    init_vq = res & PR_SVE_VL_LEN_MASK;



    for (i = init_vq; i > 15; i /= 2) {

        printf("Checking PR_SVE_SET_VL=%d\n", i);

        res = prctl(PR_SVE_SET_VL, i, 0, 0, 0, 0);

        if (res < 0) {

            printf("FAILED to PR_SVE_SET_VL (%d)", res);

            return -1;

        }

        asm("index z0.b, #0, #1\n"

            ".global __sve_ld_done\n"

            "__sve_ld_done:\n"

            "mov z0.b, #0\n"

            : /* no outputs kept */

            : /* no inputs */

            : "memory", "z0");

    }

    printf("PASS\n");

    return 0;

}



int main(int argc, char **argv)

{

    /* we also need to probe for the ioctl support */

    if (getauxval(AT_HWCAP) & HWCAP_SVE) {

        return do_sve_ioctl_test();

    } else {

        printf("SKIP: no HWCAP_SVE on this system\n");

        return 0;

    }

}