linux-kernel - [PATCH 5/5] kselftest/arm64: Cover disabling streaming mode without SVE in fp-ptrace

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Message-Id: <20250820-arm64-sme-ptrace-sme-only-v1-5-f7c22b2871f8@kernel.org>
Date: Wed, 20 Aug 2025 19:29:07 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>, 
 Jonathan Corbet <corbet@....net>, Oleg Nesterov <oleg@...hat.com>
Cc: Mark Rutland <mark.rutland@....com>, 
 David Spickett <david.spickett@....com>, 
 Thiago Jung Bauermann <thiago.bauermann@...aro.org>, 
 Luis Machado <luis.machado.foss@...il.com>, 
 linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH 5/5] kselftest/arm64: Cover disabling streaming mode
 without SVE in fp-ptrace

On a system which support SME but not SVE we can now disable streaming mode
via ptrace by writing FPSIMD formatted data through NT_ARM_SVE with a VL of
0. Extend fp-ptrace to cover rather than skip these cases, relax the check
for SVE writes of FPSIMD format data to not skip if SME is supported and
accept 0 as the VL when performing the ptrace write.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/arm64/fp/fp-ptrace.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/testing/selftests/arm64/fp/fp-ptrace.c b/tools/testing/selftests/arm64/fp/fp-ptrace.c
index cdd7a45c045d..3bb4bbff120f 100644
--- a/tools/testing/selftests/arm64/fp/fp-ptrace.c
+++ b/tools/testing/selftests/arm64/fp/fp-ptrace.c
@@ -1071,7 +1071,7 @@ static bool sve_write_supported(struct test_config *config)
 
 static bool sve_write_fpsimd_supported(struct test_config *config)
 {
-	if (!sve_supported())
+	if (!sve_supported() && !sme_supported())
 		return false;
 
 	if ((config->svcr_in & SVCR_ZA) != (config->svcr_expected & SVCR_ZA))
@@ -1231,9 +1231,6 @@ static void sve_write_fpsimd(pid_t child, struct test_config *config)
 	vl = vl_expected(config);
 	vq = __sve_vq_from_vl(vl);
 
-	if (!vl)
-		return;
-
 	iov.iov_len = SVE_PT_SIZE(vq, SVE_PT_REGS_FPSIMD);
 	iov.iov_base = malloc(iov.iov_len);
 	if (!iov.iov_base) {

-- 
2.39.5