| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2021 ARM Limited |
| * |
| * Verify that both the streaming SVE and ZA register context in |
| * signal frames is set up as expected when enabled simultaneously. |
| */ |
| |
| #include <signal.h> |
| #include <ucontext.h> |
| #include <sys/prctl.h> |
| |
| #include "test_signals_utils.h" |
| #include "testcases.h" |
| |
| static union { |
| ucontext_t uc; |
| char buf[1024 * 128]; |
| } context; |
| static unsigned int vls[SVE_VQ_MAX]; |
| unsigned int nvls = 0; |
| |
| static bool sme_get_vls(struct tdescr *td) |
| { |
| int vq, vl; |
| |
| /* |
| * Enumerate up to SVE_VQ_MAX vector lengths |
| */ |
| for (vq = SVE_VQ_MAX; vq > 0; --vq) { |
| vl = prctl(PR_SME_SET_VL, vq * 16); |
| if (vl == -1) |
| return false; |
| |
| vl &= PR_SME_VL_LEN_MASK; |
| |
| /* Did we find the lowest supported VL? */ |
| if (vq < sve_vq_from_vl(vl)) |
| break; |
| |
| /* Skip missing VLs */ |
| vq = sve_vq_from_vl(vl); |
| |
| vls[nvls++] = vl; |
| } |
| |
| /* We need at least one VL */ |
| if (nvls < 1) { |
| fprintf(stderr, "Only %d VL supported\n", nvls); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static void setup_regs(void) |
| { |
| /* smstart sm; real data is TODO */ |
| asm volatile(".inst 0xd503437f" : : : ); |
| |
| /* smstart za; real data is TODO */ |
| asm volatile(".inst 0xd503457f" : : : ); |
| } |
| |
| static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)]; |
| |
| static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc, |
| unsigned int vl) |
| { |
| size_t offset; |
| struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context); |
| struct _aarch64_ctx *regs; |
| struct sve_context *ssve; |
| struct za_context *za; |
| int ret; |
| |
| fprintf(stderr, "Testing VL %d\n", vl); |
| |
| ret = prctl(PR_SME_SET_VL, vl); |
| if (ret != vl) { |
| fprintf(stderr, "Failed to set VL, got %d\n", ret); |
| return 1; |
| } |
| |
| /* |
| * Get a signal context which should have the SVE and ZA |
| * frames in it. |
| */ |
| setup_regs(); |
| if (!get_current_context(td, &context.uc, sizeof(context))) |
| return 1; |
| |
| regs = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context), |
| &offset); |
| if (!regs) { |
| fprintf(stderr, "No SVE context\n"); |
| return 1; |
| } |
| |
| ssve = (struct sve_context *)regs; |
| if (ssve->vl != vl) { |
| fprintf(stderr, "Got SSVE VL %d, expected %d\n", ssve->vl, vl); |
| return 1; |
| } |
| |
| if (!(ssve->flags & SVE_SIG_FLAG_SM)) { |
| fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n"); |
| return 1; |
| } |
| |
| fprintf(stderr, "Got expected SSVE size %u and VL %d\n", |
| regs->size, ssve->vl); |
| |
| regs = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context), |
| &offset); |
| if (!regs) { |
| fprintf(stderr, "No ZA context\n"); |
| return 1; |
| } |
| |
| za = (struct za_context *)regs; |
| if (za->vl != vl) { |
| fprintf(stderr, "Got ZA VL %d, expected %d\n", za->vl, vl); |
| return 1; |
| } |
| |
| fprintf(stderr, "Got expected ZA size %u and VL %d\n", |
| regs->size, za->vl); |
| |
| /* We didn't load any data into ZA so it should be all zeros */ |
| if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET, |
| ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) { |
| fprintf(stderr, "ZA data invalid\n"); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc) |
| { |
| int i; |
| |
| for (i = 0; i < nvls; i++) { |
| if (do_one_sme_vl(td, si, uc, vls[i])) |
| return 1; |
| } |
| |
| td->pass = 1; |
| |
| return 0; |
| } |
| |
| struct tdescr tde = { |
| .name = "Streaming SVE registers", |
| .descr = "Check that we get the right Streaming SVE registers reported", |
| .feats_required = FEAT_SME, |
| .timeout = 3, |
| .init = sme_get_vls, |
| .run = sme_regs, |
| }; |