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kselftest/arm64: Fix enumeration of systems without 128 bit SME for SSVE+ZA

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[ Upstream commit a7db82f18c ]

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 in the newly
added ssve_za_regs test.

Fixes: bc69da5ff0 ("kselftest/arm64: Verify simultaneous SSVE and ZA context generation")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230131-arm64-kselftest-sig-sme-no-128-v1-2-d47c13dc8e1e@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Stable-dep-of: 5225b6562b9a ("kselftest/arm64: signal: fix/refactor SVE vector length enumeration")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mark Brown
2023-01-31 22:56:35 +00:00
committed by Greg Kroah-Hartman
parent 2505532410
commit 17f8c83212
1 changed files with 4 additions and 0 deletions
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4
tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c
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@@ -34,6 +34,10 @@ static bool sme_get_vls(struct tdescr *td)
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);