1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 ARM Limited
4 *
5 * Verify that both the streaming SVE and ZA register context in
6 * signal frames is set up as expected when enabled simultaneously.
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 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_regs(void)
57 {
58 /* smstart sm; real data is TODO */
59 asm volatile(".inst 0xd503437f" : : : );
60
61 /* smstart za; real data is TODO */
62 asm volatile(".inst 0xd503457f" : : : );
63 }
64
65 static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)];
66
67 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
68 unsigned int vl)
69 {
70 size_t offset;
71 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
72 struct _aarch64_ctx *regs;
73 struct sve_context *ssve;
74 struct za_context *za;
75 int ret;
76
77 fprintf(stderr, "Testing VL %d\n", vl);
78
79 ret = prctl(PR_SME_SET_VL, vl);
80 if (ret != vl) {
81 fprintf(stderr, "Failed to set VL, got %d\n", ret);
82 return 1;
83 }
84
85 /*
86 * Get a signal context which should have the SVE and ZA
87 * frames in it.
88 */
89 setup_regs();
90 if (!get_current_context(td, &context.uc, sizeof(context)))
91 return 1;
92
93 regs = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
94 &offset);
95 if (!regs) {
96 fprintf(stderr, "No SVE context\n");
97 return 1;
98 }
99
100 ssve = (struct sve_context *)regs;
101 if (ssve->vl != vl) {
102 fprintf(stderr, "Got SSVE VL %d, expected %d\n", ssve->vl, vl);
103 return 1;
104 }
105
106 if (!(ssve->flags & SVE_SIG_FLAG_SM)) {
107 fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");
108 return 1;
109 }
110
111 fprintf(stderr, "Got expected SSVE size %u and VL %d\n",
112 regs->size, ssve->vl);
113
114 regs = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context),
115 &offset);
116 if (!regs) {
117 fprintf(stderr, "No ZA context\n");
118 return 1;
119 }
120
121 za = (struct za_context *)regs;
122 if (za->vl != vl) {
123 fprintf(stderr, "Got ZA VL %d, expected %d\n", za->vl, vl);
124 return 1;
125 }
126
127 fprintf(stderr, "Got expected ZA size %u and VL %d\n",
128 regs->size, za->vl);
129
130 /* We didn't load any data into ZA so it should be all zeros */
131 if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET,
132 ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) {
133 fprintf(stderr, "ZA data invalid\n");
134 return 1;
135 }
136
137 return 0;
138 }
139
140 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
141 {
142 int i;
143
144 for (i = 0; i < nvls; i++) {
145 if (do_one_sme_vl(td, si, uc, vls[i]))
146 return 1;
147 }
148
149 td->pass = 1;
150
151 return 0;
152 }
153
154 struct tdescr tde = {
155 .name = "Streaming SVE registers",
156 .descr = "Check that we get the right Streaming SVE registers reported",
157 .feats_required = FEAT_SME,
158 .timeout = 3,
159 .init = sme_get_vls,
160 .run = sme_regs,
161 };
162
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