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 
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_ssve_regs(void)
37 {
38 	/* smstart sm; real data is TODO */
39 	asm volatile(".inst 0xd503437f" : : : );
40 }
41 
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 	return 0;
89 }
90 
91 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
92 {
93 	int i;
94 
95 	for (i = 0; i < nvls; i++) {
96 		if (do_one_sme_vl(td, si, uc, vls[i]))
97 			return 1;
98 	}
99 
100 	td->pass = 1;
101 
102 	return 0;
103 }
104 
105 struct tdescr tde = {
106 	.name = "Streaming SVE registers",
107 	.descr = "Check that we get the right Streaming SVE registers reported",
108 	.feats_required = FEAT_SME,
109 	.timeout = 3,
110 	.init = sme_get_vls,
111 	.run = sme_regs,
112 };
113