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 <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 * 64];
21 } context;
22
sme_get_vls(struct tdescr * td)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
setup_ssve_regs(void)36 static void setup_ssve_regs(void)
37 {
38 /* smstart sm; real data is TODO */
39 asm volatile(".inst 0xd503437f" : : : );
40 }
41
do_one_sme_vl(struct tdescr * td,siginfo_t * si,ucontext_t * uc,unsigned int vl)42 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
43 unsigned int vl)
44 {
45 size_t offset;
46 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
47 struct sve_context *ssve;
48 int ret;
49
50 fprintf(stderr, "Testing VL %d\n", vl);
51
52 ret = prctl(PR_SME_SET_VL, vl);
53 if (ret != vl) {
54 fprintf(stderr, "Failed to set VL, got %d\n", ret);
55 return 1;
56 }
57
58 /*
59 * Get a signal context which should have a SVE frame and registers
60 * in it.
61 */
62 setup_ssve_regs();
63 if (!get_current_context(td, &context.uc, sizeof(context)))
64 return 1;
65
66 head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
67 &offset);
68 if (!head) {
69 fprintf(stderr, "No SVE context\n");
70 return 1;
71 }
72
73 ssve = (struct sve_context *)head;
74 if (ssve->vl != vl) {
75 fprintf(stderr, "Got VL %d, expected %d\n", ssve->vl, vl);
76 return 1;
77 }
78
79 if (!(ssve->flags & SVE_SIG_FLAG_SM)) {
80 fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");
81 return 1;
82 }
83
84 /* The actual size validation is done in get_current_context() */
85 fprintf(stderr, "Got expected size %u and VL %d\n",
86 head->size, ssve->vl);
87
88 if (get_svcr() != 0) {
89 fprintf(stderr, "Unexpected SVCR %lx\n", get_svcr());
90 return 1;
91 }
92
93 return 0;
94 }
95
sme_regs(struct tdescr * td,siginfo_t * si,ucontext_t * uc)96 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
97 {
98 int i;
99
100 for (i = 0; i < nvls; i++) {
101 if (do_one_sme_vl(td, si, uc, vls[i]))
102 return 1;
103 }
104
105 td->pass = 1;
106
107 return 0;
108 }
109
110 struct tdescr tde = {
111 .name = "Streaming SVE registers",
112 .descr = "Check that we get the right Streaming SVE registers reported",
113 .feats_required = FEAT_SME,
114 .timeout = 3,
115 .init = sme_get_vls,
116 .run = sme_regs,
117 };
118