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kernel
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linux
kselftest/arm64: Verify simultaneous SSVE and ZA context generation
Add a test that generates SSVE and ZA context in a single signal frame to
ensure that nothing is going wrong in that case for any reason.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230117-arm64-test-ssve-za-v1-2-203c00150154@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
authored by
Mark Brown
and committed by
Catalin Marinas
bc69da5f
f76cb73a
+162
+162
tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c
+162
tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2021 ARM Limited
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*
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* Verify that both the streaming SVE and ZA register context in
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* signal frames is set up as expected when enabled simultaneously.
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*/
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#include <signal.h>
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#include <ucontext.h>
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#include <sys/prctl.h>
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#include "test_signals_utils.h"
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#include "testcases.h"
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static union {
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ucontext_t uc;
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char buf[1024 * 128];
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} context;
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static unsigned int vls[SVE_VQ_MAX];
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unsigned int nvls = 0;
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static bool sme_get_vls(struct tdescr *td)
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{
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int vq, vl;
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/*
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* Enumerate up to SVE_VQ_MAX vector lengths
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*/
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for (vq = SVE_VQ_MAX; vq > 0; --vq) {
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vl = prctl(PR_SME_SET_VL, vq * 16);
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if (vl == -1)
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return false;
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vl &= PR_SME_VL_LEN_MASK;
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/* Skip missing VLs */
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vq = sve_vq_from_vl(vl);
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vls[nvls++] = vl;
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}
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/* We need at least one VL */
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if (nvls < 1) {
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fprintf(stderr, "Only %d VL supported\n", nvls);
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return false;
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}
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return true;
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}
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static void setup_regs(void)
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{
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/* smstart sm; real data is TODO */
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asm volatile(".inst 0xd503437f" : : : );
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/* smstart za; real data is TODO */
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asm volatile(".inst 0xd503457f" : : : );
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}
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static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)];
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static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
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unsigned int vl)
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{
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size_t offset;
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struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
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struct _aarch64_ctx *regs;
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struct sve_context *ssve;
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struct za_context *za;
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int ret;
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fprintf(stderr, "Testing VL %d\n", vl);
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ret = prctl(PR_SME_SET_VL, vl);
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if (ret != vl) {
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fprintf(stderr, "Failed to set VL, got %d\n", ret);
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return 1;
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}
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/*
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* Get a signal context which should have the SVE and ZA
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* frames in it.
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*/
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setup_regs();
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if (!get_current_context(td, &context.uc, sizeof(context)))
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return 1;
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regs = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
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&offset);
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if (!regs) {
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fprintf(stderr, "No SVE context\n");
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return 1;
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}
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ssve = (struct sve_context *)regs;
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if (ssve->vl != vl) {
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fprintf(stderr, "Got SSVE VL %d, expected %d\n", ssve->vl, vl);
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return 1;
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}
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if (!(ssve->flags & SVE_SIG_FLAG_SM)) {
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fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");
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return 1;
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}
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fprintf(stderr, "Got expected SSVE size %u and VL %d\n",
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regs->size, ssve->vl);
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regs = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context),
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&offset);
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if (!regs) {
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fprintf(stderr, "No ZA context\n");
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return 1;
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}
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za = (struct za_context *)regs;
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if (za->vl != vl) {
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fprintf(stderr, "Got ZA VL %d, expected %d\n", za->vl, vl);
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return 1;
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}
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fprintf(stderr, "Got expected ZA size %u and VL %d\n",
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regs->size, za->vl);
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/* We didn't load any data into ZA so it should be all zeros */
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if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET,
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ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) {
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fprintf(stderr, "ZA data invalid\n");
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return 1;
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}
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return 0;
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}
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static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
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{
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int i;
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for (i = 0; i < nvls; i++) {
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if (do_one_sme_vl(td, si, uc, vls[i]))
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return 1;
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}
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td->pass = 1;
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return 0;
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}
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struct tdescr tde = {
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.name = "Streaming SVE registers",
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.descr = "Check that we get the right Streaming SVE registers reported",
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/*
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* We shouldn't require FA64 but things like memset() used in the
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* helpers might use unsupported instructions so for now disable
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* the test unless we've got the full instruction set.
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*/
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.feats_required = FEAT_SME | FEAT_SME_FA64,
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.timeout = 3,
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.init = sme_get_vls,
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.run = sme_regs,
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};