1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015-2020 ARM Limited.
4 * Original author: Dave Martin <Dave.Martin@arm.com>
5 */
6 #include <assert.h>
7 #include <errno.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <sys/auxv.h>
12 #include <sys/prctl.h>
13 #include <asm/sigcontext.h>
14
15 #include "../../kselftest.h"
16 #include "rdvl.h"
17
18 int main(int argc, char **argv)
19 {
20 unsigned int vq;
21 int vl;
22 static unsigned int vqs[SVE_VQ_MAX];
23 unsigned int nvqs = 0;
24
25 ksft_print_header();
26 ksft_set_plan(2);
27
28 if (!(getauxval(AT_HWCAP) & HWCAP_SVE))
29 ksft_exit_skip("SVE not available\n");
30
31 /*
32 * Enumerate up to SVE_VQ_MAX vector lengths
33 */
34 for (vq = SVE_VQ_MAX; vq > 0; --vq) {
35 vl = prctl(PR_SVE_SET_VL, vq * 16);
36 if (vl == -1)
37 ksft_exit_fail_msg("PR_SVE_SET_VL failed: %s (%d)\n",
38 strerror(errno), errno);
39
40 vl &= PR_SVE_VL_LEN_MASK;
41
42 if (rdvl_sve() != vl)
43 ksft_exit_fail_msg("PR_SVE_SET_VL reports %d, RDVL %d\n",
44 vl, rdvl_sve());
45
46 if (!sve_vl_valid(vl))
47 ksft_exit_fail_msg("VL %d invalid\n", vl);
48 vq = sve_vq_from_vl(vl);
49
50 if (!(nvqs < SVE_VQ_MAX))
51 ksft_exit_fail_msg("Too many VLs %u >= SVE_VQ_MAX\n",
52 nvqs);
53 vqs[nvqs++] = vq;
54 }
55 ksft_test_result_pass("Enumerated %d vector lengths\n", nvqs);
56 ksft_test_result_pass("All vector lengths valid\n");
57
58 /* Print out the vector lengths in ascending order: */
59 while (nvqs--)
60 ksft_print_msg("%u\n", 16 * vqs[nvqs]);
61
62 ksft_exit_pass();
63 }
64
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