1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 ARM Limited
4 *
5 * Verify that the ZA register context in signal frames is set up as
6 * expected.
7 */
8
9 #include <signal.h>
10 #include <ucontext.h>
11 #include <sys/prctl.h>
12
13 #include "test_signals_utils.h"
14 #include "testcases.h"
15
16 static union {
17 ucontext_t uc;
18 char buf[1024 * 128];
19 } context;
20 static unsigned int vls[SVE_VQ_MAX];
21 unsigned int nvls = 0;
22
23 static bool sme_get_vls(struct tdescr *td)
24 {
25 int vq, vl;
26
27 /*
28 * Enumerate up to SME_VQ_MAX vector lengths
29 */
30 for (vq = SVE_VQ_MAX; vq > 0; --vq) {
31 vl = prctl(PR_SME_SET_VL, vq * 16);
32 if (vl == -1)
33 return false;
34
35 vl &= PR_SME_VL_LEN_MASK;
36
37 /* Skip missing VLs */
38 vq = sve_vq_from_vl(vl);
39
40 vls[nvls++] = vl;
41 }
42
43 /* We need at least one VL */
44 if (nvls < 1) {
45 fprintf(stderr, "Only %d VL supported\n", nvls);
46 return false;
47 }
48
49 return true;
50 }
51
52 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
53 unsigned int vl)
54 {
55 size_t offset;
56 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
57 struct za_context *za;
58
59 fprintf(stderr, "Testing VL %d\n", vl);
60
61 if (prctl(PR_SME_SET_VL, vl) != vl) {
62 fprintf(stderr, "Failed to set VL\n");
63 return 1;
64 }
65
66 /*
67 * Get a signal context which should have a SVE frame and registers
68 * in it.
69 */
70 if (!get_current_context(td, &context.uc, sizeof(context)))
71 return 1;
72
73 head = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context), &offset);
74 if (!head) {
75 fprintf(stderr, "No ZA context\n");
76 return 1;
77 }
78
79 za = (struct za_context *)head;
80 if (za->vl != vl) {
81 fprintf(stderr, "Got VL %d, expected %d\n", za->vl, vl);
82 return 1;
83 }
84
85 if (head->size != ZA_SIG_REGS_OFFSET) {
86 fprintf(stderr, "Context size %u, expected %lu\n",
87 head->size, ZA_SIG_REGS_OFFSET);
88 return 1;
89 }
90
91 /* The actual size validation is done in get_current_context() */
92 fprintf(stderr, "Got expected size %u and VL %d\n",
93 head->size, za->vl);
94
95 return 0;
96 }
97
98 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
99 {
100 int i;
101
102 for (i = 0; i < nvls; i++) {
103 if (do_one_sme_vl(td, si, uc, vls[i]))
104 return 1;
105 }
106
107 td->pass = 1;
108
109 return 0;
110 }
111
112 struct tdescr tde = {
113 .name = "ZA registers - ZA disabled",
114 .descr = "Check ZA context with ZA disabled",
115 .feats_required = FEAT_SME,
116 .timeout = 3,
117 .init = sme_get_vls,
118 .run = sme_regs,
119 };
120
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