From nobody Tue Nov 26 00:25:00 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 817B62003A8; Wed, 23 Oct 2024 20:39:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729715989; cv=none; b=ZQVUq7bomnm1+VaHFUIcxVPIV+nK0ZPFutA3z3Zxs076y+PgYEbK5wWtyg18sgXSdr82zFKEqk3mHDjQmQiWOjOJEtzvbC1i2AUSsUoMTBH9vPH4MhVkkjZMOcQ6faVww1fg183yc+COxtnr/3THDSnsV+URF6fVE6v5KzfBeRc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729715989; c=relaxed/simple; bh=WEpX97GMGue5h7bD/Qq1020rZU1gV6I6QjnRHlLOdmM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=KVSjWO6h0oAtUCKHBJQmk6cfUVsQ2ksIHGA6vM6PVXssypubiu8Piv+mIxbheiX+ll0aPrO0OBDvtmITd/y1AzQ17yeYiGWfqP49flrgdq7wqSsjtEFd+F6aLpH2E+sYpIwl0hGcjbgu7vINdLXMdovaOcvOt/0Hdckba8mDF9c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Dahnr0R7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Dahnr0R7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 67550C4CEC6; Wed, 23 Oct 2024 20:39:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729715989; bh=WEpX97GMGue5h7bD/Qq1020rZU1gV6I6QjnRHlLOdmM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Dahnr0R796Tfqila1uyH46kYi0NyolVV4NVVXPx6GyX+TrSMZvzYKC2IORDw91YcN tKn1v2LWgFdFPtpoEwjbgjk6TcOIttCRanO+Wn1Kx9ktepzB0DLWfPn2k9kRbxHEpv QVJKi4Vw2rDOt4PFgydLmUw68t6yFax8L3/qoTLFOZ8PTnT7PfbFP2Bi5t25UtJb/L 6DSwhJRBYZF4xpoY6+nQKd+4pjUNnGnL5IqlXi/vM6Trl54bV9JIarDJsED5Y7BdQA L+46L5knrXhElA4DrTtP4mAA62AOtl3HX8KthlH7C5vPXUsyLB8HoAnyPG094zqjm1 RfDstiEW0BL5w== From: Mark Brown Date: Wed, 23 Oct 2024 21:38:32 +0100 Subject: [PATCH 4/6] kselftest/arm64: Implement irritators for ZA and ZT Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241023-arm64-fp-stress-irritator-v1-4-a51af298d449@kernel.org> References: <20241023-arm64-fp-stress-irritator-v1-0-a51af298d449@kernel.org> In-Reply-To: <20241023-arm64-fp-stress-irritator-v1-0-a51af298d449@kernel.org> To: Catalin Marinas , Will Deacon , Shuah Khan Cc: Mark Rutland , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-9b746 X-Developer-Signature: v=1; a=openpgp-sha256; l=2511; i=broonie@kernel.org; h=from:subject:message-id; bh=WEpX97GMGue5h7bD/Qq1020rZU1gV6I6QjnRHlLOdmM=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBnGV8IqFapOgWCDGYthrlNY7lK+roKfgEiszak93NR OziALsmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZxlfCAAKCRAk1otyXVSH0C8aB/ 9UFKrDED/C0Pc/AaNhAZcgAygaJXFU3+FqMiLgUTnRqeckBQB23OIdfU76q00F6+cT6wcXrddgjfVq MN5mRc7jPQF2rWgQEsUviDNoaRJuSk89KZDFW0vOjP0KOqSS3U6rVinrrSGwF/1S3Y2VU9mdRY7ZGY gtvGmm+spMMl+ImoOlbp2kwd589P2O798KVzGLyKtjt0vWyzTPzEeNBWN92SbdgYKuH2tBvd35PhEy hW1oGvxgsIaWSIuuik8tF7zyvh76LntL4xi+PKyt8f/uv6RFAjkr3TFONT9HaYPi8vg3r9V4EhcHsY pwKFhl48BWyYjvD6WHIwzrUzHfEUBP X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Currently we don't use the irritator signal in our floating point stress tests so when we added ZA and ZT stress tests we didn't actually bother implementing any actual action in the handlers, we just counted the signal deliveries. In preparation for using the irritators let's implement them, just trivially SMSTOP and SMSTART to reset all bits in the register to 0. Signed-off-by: Mark Brown Acked-by: Mark Rutland --- tools/testing/selftests/arm64/fp/za-test.S | 12 ++++-------- tools/testing/selftests/arm64/fp/zt-test.S | 12 ++++-------- 2 files changed, 8 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/arm64/fp/za-test.S b/tools/testing/sel= ftests/arm64/fp/za-test.S index 1ee0ec36766d2bef92aff50a002813e76e22963c..f902e6ef9077bfa34fa7f85ce57= 2ce3df4346789 100644 --- a/tools/testing/selftests/arm64/fp/za-test.S +++ b/tools/testing/selftests/arm64/fp/za-test.S @@ -148,20 +148,16 @@ function check_za b memcmp endfunction =20 -// Any SME register modified here can cause corruption in the main -// thread -- but *only* the locations modified here. +// Modify the live SME register state, signal return will undo our changes function irritator_handler // Increment the irritation signal count (x23): ldr x0, [x2, #ucontext_regs + 8 * 23] add x0, x0, #1 str x0, [x2, #ucontext_regs + 8 * 23] =20 - // Corrupt some random ZA data -#if 0 - movi v0.8b, #1 - movi v9.16b, #2 - movi v31.8b, #3 -#endif + // This will reset ZA to all bits 0 + smstop + smstart =20 ret endfunction diff --git a/tools/testing/selftests/arm64/fp/zt-test.S b/tools/testing/sel= ftests/arm64/fp/zt-test.S index ade9c98abcdafc2755ef4796670566d99e919e5c..c96cb7c2ad4b406c54099fe3f73= 917259bd947e4 100644 --- a/tools/testing/selftests/arm64/fp/zt-test.S +++ b/tools/testing/selftests/arm64/fp/zt-test.S @@ -117,20 +117,16 @@ function check_zt b memcmp endfunction =20 -// Any SME register modified here can cause corruption in the main -// thread -- but *only* the locations modified here. +// Modify the live SME register state, signal return will undo our changes function irritator_handler // Increment the irritation signal count (x23): ldr x0, [x2, #ucontext_regs + 8 * 23] add x0, x0, #1 str x0, [x2, #ucontext_regs + 8 * 23] =20 - // Corrupt some random ZT data -#if 0 - movi v0.8b, #1 - movi v9.16b, #2 - movi v31.8b, #3 -#endif + // This will reset ZT to all bits 0 + smstop + smstart =20 ret endfunction --=20 2.39.2