70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
* 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;
|
|
}
|
|
}
|