2b6d6371a9
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: Alex Bennée <alex.bennee@linaro.org> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20200316172155.971-25-alex.bennee@linaro.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* SVE ioctls tests
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*
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* Test the SVE width setting ioctls work and provide a base for
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* testing the gdbstub.
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*
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* Copyright (c) 2019 Linaro Ltd
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <sys/prctl.h>
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#include <asm/hwcap.h>
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#include <stdio.h>
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#include <sys/auxv.h>
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#include <stdint.h>
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#include <stdlib.h>
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#ifndef HWCAP_CPUID
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#define HWCAP_CPUID (1 << 11)
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#endif
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#define SVE_MAX_QUADS (2048 / 128)
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#define BYTES_PER_QUAD (128 / 8)
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#define get_cpu_reg(id) ({ \
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unsigned long __val; \
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asm("mrs %0, "#id : "=r" (__val)); \
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__val; \
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})
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static int do_sve_ioctl_test(void)
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{
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int i, res, init_vq;
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res = prctl(PR_SVE_GET_VL, 0, 0, 0, 0);
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if (res < 0) {
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printf("FAILED to PR_SVE_GET_VL (%d)", res);
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return -1;
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}
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init_vq = res & PR_SVE_VL_LEN_MASK;
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for (i = init_vq; i > 15; i /= 2) {
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printf("Checking PR_SVE_SET_VL=%d\n", i);
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res = prctl(PR_SVE_SET_VL, i, 0, 0, 0, 0);
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if (res < 0) {
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printf("FAILED to PR_SVE_SET_VL (%d)", res);
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return -1;
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}
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asm("index z0.b, #0, #1\n"
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".global __sve_ld_done\n"
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"__sve_ld_done:\n"
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"mov z0.b, #0\n"
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: /* no outputs kept */
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: /* no inputs */
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: "memory", "z0");
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}
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printf("PASS\n");
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return 0;
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}
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int main(int argc, char **argv)
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{
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/* we also need to probe for the ioctl support */
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if (getauxval(AT_HWCAP) & HWCAP_SVE) {
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return do_sve_ioctl_test();
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} else {
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printf("SKIP: no HWCAP_SVE on this system\n");
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return 0;
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}
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}
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