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
sme_get_vls(struct tdescr * td)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 /* 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
setup_ssve_regs(void)52 static void setup_ssve_regs(void)
53 {
54 /* smstart sm; real data is TODO */
55 asm volatile(".inst 0xd503437f" : : : );
56 }
57
do_one_sme_vl(struct tdescr * td,siginfo_t * si,ucontext_t * uc,unsigned int vl)58 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
59 unsigned int vl)
60 {
61 size_t offset;
62 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
63 struct sve_context *ssve;
64 int ret;
65
66 fprintf(stderr, "Testing VL %d\n", vl);
67
68 ret = prctl(PR_SME_SET_VL, vl);
69 if (ret != vl) {
70 fprintf(stderr, "Failed to set VL, got %d\n", ret);
71 return 1;
72 }
73
74 /*
75 * Get a signal context which should have a SVE frame and registers
76 * in it.
77 */
78 setup_ssve_regs();
79 if (!get_current_context(td, &context.uc, sizeof(context)))
80 return 1;
81
82 head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
83 &offset);
84 if (!head) {
85 fprintf(stderr, "No SVE context\n");
86 return 1;
87 }
88
89 ssve = (struct sve_context *)head;
90 if (ssve->vl != vl) {
91 fprintf(stderr, "Got VL %d, expected %d\n", ssve->vl, vl);
92 return 1;
93 }
94
95 /* The actual size validation is done in get_current_context() */
96 fprintf(stderr, "Got expected size %u and VL %d\n",
97 head->size, ssve->vl);
98
99 return 0;
100 }
101
sme_regs(struct tdescr * td,siginfo_t * si,ucontext_t * uc)102 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
103 {
104 int i;
105
106 for (i = 0; i < nvls; i++) {
107 if (do_one_sme_vl(td, si, uc, vls[i]))
108 return 1;
109 }
110
111 td->pass = 1;
112
113 return 0;
114 }
115
116 struct tdescr tde = {
117 .name = "Streaming SVE registers",
118 .descr = "Check that we get the right Streaming SVE registers reported",
119 /*
120 * We shouldn't require FA64 but things like memset() used in the
121 * helpers might use unsupported instructions so for now disable
122 * the test unless we've got the full instruction set.
123 */
124 .feats_required = FEAT_SME | FEAT_SME_FA64,
125 .timeout = 3,
126 .init = sme_get_vls,
127 .run = sme_regs,
128 };
129