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 <kselftest.h>
10 #include <signal.h>
11 #include <ucontext.h>
12 #include <sys/prctl.h>
13
14 #include "test_signals_utils.h"
15 #include "sve_helpers.h"
16 #include "testcases.h"
17
18 static union {
19 ucontext_t uc;
20 char buf[1024 * 128];
21 } context;
22
23 static bool sme_get_vls(struct tdescr *td)
24 {
25 int res = sve_fill_vls(VLS_USE_SME, 1);
26
27 if (!res)
28 return true;
29
30 if (res == KSFT_SKIP)
31 td->result = KSFT_SKIP;
32
33 return false;
34 }
35
36 static void setup_regs(void)
37 {
38 /* smstart sm; real data is TODO */
39 asm volatile(".inst 0xd503437f" : : : );
40
41 /* smstart za; real data is TODO */
42 asm volatile(".inst 0xd503457f" : : : );
43 }
44
45 static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)];
46
47 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
48 unsigned int vl)
49 {
50 size_t offset;
51 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
52 struct _aarch64_ctx *regs;
53 struct sve_context *ssve;
54 struct za_context *za;
55 int ret;
56
57 fprintf(stderr, "Testing VL %d\n", vl);
58
59 ret = prctl(PR_SME_SET_VL, vl);
60 if (ret != vl) {
61 fprintf(stderr, "Failed to set VL, got %d\n", ret);
62 return 1;
63 }
64
65 /*
66 * Get a signal context which should have the SVE and ZA
67 * frames in it.
68 */
69 setup_regs();
70 if (!get_current_context(td, &context.uc, sizeof(context)))
71 return 1;
72
73 regs = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
74 &offset);
75 if (!regs) {
76 fprintf(stderr, "No SVE context\n");
77 return 1;
78 }
79
80 ssve = (struct sve_context *)regs;
81 if (ssve->vl != vl) {
82 fprintf(stderr, "Got SSVE VL %d, expected %d\n", ssve->vl, vl);
83 return 1;
84 }
85
86 if (!(ssve->flags & SVE_SIG_FLAG_SM)) {
87 fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");
88 return 1;
89 }
90
91 fprintf(stderr, "Got expected SSVE size %u and VL %d\n",
92 regs->size, ssve->vl);
93
94 regs = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context),
95 &offset);
96 if (!regs) {
97 fprintf(stderr, "No ZA context\n");
98 return 1;
99 }
100
101 za = (struct za_context *)regs;
102 if (za->vl != vl) {
103 fprintf(stderr, "Got ZA VL %d, expected %d\n", za->vl, vl);
104 return 1;
105 }
106
107 fprintf(stderr, "Got expected ZA size %u and VL %d\n",
108 regs->size, za->vl);
109
110 /* We didn't load any data into ZA so it should be all zeros */
111 if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET,
112 ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) {
113 fprintf(stderr, "ZA data invalid\n");
114 return 1;
115 }
116
117 return 0;
118 }
119
120 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
121 {
122 int i;
123
124 for (i = 0; i < nvls; i++) {
125 if (do_one_sme_vl(td, si, uc, vls[i]))
126 return 1;
127 }
128
129 td->pass = 1;
130
131 return 0;
132 }
133
134 struct tdescr tde = {
135 .name = "Streaming SVE registers",
136 .descr = "Check that we get the right Streaming SVE registers reported",
137 .feats_required = FEAT_SME,
138 .timeout = 3,
139 .init = sme_get_vls,
140 .run = sme_regs,
141 };
142
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