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