1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
* 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;
}
}
|
