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5f38923853
The current signal handling tests for SME do not account for the fact that
unlike SVE all SME vector lengths are optional so we can't guarantee that
we will encounter the minimum possible VL, they will hang enumerating VLs
on such systems. Abort enumeration when we find the lowest VL.
Fixes: 4963aeb35a ("kselftest/arm64: signal: Add SME signal handling tests")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230131-arm64-kselftest-sig-sme-no-128-v1-1-d47c13dc8e1e@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
133 lines
2.6 KiB
C
133 lines
2.6 KiB
C
// 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 the streaming SVE register context in signal frames is
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* set up as expected.
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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 * 64];
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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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/* Did we find the lowest supported VL? */
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if (vq < sve_vq_from_vl(vl))
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break;
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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_ssve_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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}
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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 sve_context *ssve;
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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 a SVE frame and registers
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* in it.
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*/
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setup_ssve_regs();
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if (!get_current_context(td, &context.uc, sizeof(context)))
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return 1;
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head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
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&offset);
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if (!head) {
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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 *)head;
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if (ssve->vl != vl) {
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fprintf(stderr, "Got 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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/* The actual size validation is done in get_current_context() */
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fprintf(stderr, "Got expected size %u and VL %d\n",
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head->size, ssve->vl);
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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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.feats_required = FEAT_SME,
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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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};
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