1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 ARM Limited
4 *
5 * Verify that the streaming SVE register context in signal frames is
6 * set up as 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 * 64];
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 SVE_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 /* Did we find the lowest supported VL? */
38 if (vq < sve_vq_from_vl(vl))
39 break;
40
41 /* Skip missing VLs */
42 vq = sve_vq_from_vl(vl);
43
44 vls[nvls++] = vl;
45 }
46
47 /* We need at least one VL */
48 if (nvls < 1) {
49 fprintf(stderr, "Only %d VL supported\n", nvls);
50 return false;
51 }
52
53 return true;
54 }
55
56 static void setup_ssve_regs(void)
57 {
58 /* smstart sm; real data is TODO */
59 asm volatile(".inst 0xd503437f" : : : );
60 }
61
62 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
63 unsigned int vl)
64 {
65 size_t offset;
66 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
67 struct sve_context *ssve;
68 int ret;
69
70 fprintf(stderr, "Testing VL %d\n", vl);
71
72 ret = prctl(PR_SME_SET_VL, vl);
73 if (ret != vl) {
74 fprintf(stderr, "Failed to set VL, got %d\n", ret);
75 return 1;
76 }
77
78 /*
79 * Get a signal context which should have a SVE frame and registers
80 * in it.
81 */
82 setup_ssve_regs();
83 if (!get_current_context(td, &context.uc, sizeof(context)))
84 return 1;
85
86 head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
87 &offset);
88 if (!head) {
89 fprintf(stderr, "No SVE context\n");
90 return 1;
91 }
92
93 ssve = (struct sve_context *)head;
94 if (ssve->vl != vl) {
95 fprintf(stderr, "Got VL %d, expected %d\n", ssve->vl, vl);
96 return 1;
97 }
98
99 if (!(ssve->flags & SVE_SIG_FLAG_SM)) {
100 fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");
101 return 1;
102 }
103
104 /* The actual size validation is done in get_current_context() */
105 fprintf(stderr, "Got expected size %u and VL %d\n",
106 head->size, ssve->vl);
107
108 return 0;
109 }
110
111 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
112 {
113 int i;
114
115 for (i = 0; i < nvls; i++) {
116 if (do_one_sme_vl(td, si, uc, vls[i]))
117 return 1;
118 }
119
120 td->pass = 1;
121
122 return 0;
123 }
124
125 struct tdescr tde = {
126 .name = "Streaming SVE registers",
127 .descr = "Check that we get the right Streaming SVE registers reported",
128 .feats_required = FEAT_SME,
129 .timeout = 3,
130 .init = sme_get_vls,
131 .run = sme_regs,
132 };
133
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