From patchwork Fri Dec 10 18:41:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12670663 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63472C433EF for ; Fri, 10 Dec 2021 18:44:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245247AbhLJSr7 (ORCPT ); Fri, 10 Dec 2021 13:47:59 -0500 Received: from sin.source.kernel.org ([145.40.73.55]:47570 "EHLO sin.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245496AbhLJSr6 (ORCPT ); Fri, 10 Dec 2021 13:47:58 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 21E76CE2C89 for ; Fri, 10 Dec 2021 18:44:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFB4BC341C7; Fri, 10 Dec 2021 18:44:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1639161860; bh=mjm7thjDN8diH9n6OczzntZPpt/lXCMWc+eQF8W+ua8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W3FuoCZWqpiU9Fa8U1c81ZaeREULX2t9bFMAvGbH1bfFHRyyZwFXI3Wi04A6Ei5y5 iuu5YsBXtTRBv04e8Bhy/4YFYJ1QweNGiyUM18NdNCa50ocRr0h64f9zaqK/vELQzt fHxkQIygt+N+UNjv8ui/82TYVCxpIDPk/ji9145/2Sc8pLURCsEw/llgRGwdYS7K7y 9Bf2B+xrgcy0mxRpr3mvwj58jwhBXx0U2EQxZiF44cM7ZrRBF3cKYN8LVjwqSHpZVb BuVaTxHMx/pe2+pw9zrScv3+DEJRFA6h4GnkctsPiOIqsOrydFTEcWYIIhswsLh+S9 LCzlC6G57Uu3w== From: Mark Brown To: Catalin Marinas , Will Deacon , Shuah Khan , Shuah Khan Cc: Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Mark Brown Subject: [PATCH v7 15/37] arm64/sme: Implement sysctl to set the default vector length Date: Fri, 10 Dec 2021 18:41:11 +0000 Message-Id: <20211210184133.320748-16-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211210184133.320748-1-broonie@kernel.org> References: <20211210184133.320748-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1673; h=from:subject; bh=mjm7thjDN8diH9n6OczzntZPpt/lXCMWc+eQF8W+ua8=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBhs59KFYe22kPJ1r98BQ03YcX/sBy1CdLzbUxts54q MsZ1nC6JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYbOfSgAKCRAk1otyXVSH0CMUCA CD1ExPQiiWYJoFlTl6HnGpjbFrdwIfZ39TSAzTbfoYxk6b0Ci/ApVJc+Pw48+j6mmJ7OVH8Q+SAKEV 5FD+DWUvlasVQ+Fnr/NqWwwtHTZyc73dq7uBlj/fhSx7g/zLXfjkcFrFRjCn81AL3zUs7JaO/FC7VE pLIEJr4x+EBK7sDJC58PlZJIs3bshl/6/AWLyJN0HHUKcQjNtJGIMUvMzD3tO66WZtj1RDQ74Zm3km 1ByYV+XayAscHiLQSqB4gV/K8fXC1yXTcElYigKc+pOxzIObImreG82jx8mhG0zQO23bvi1j9iKOTr wT7IfmVrTtN65eZlxjwDGymJDN7D9R X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org As for SVE provide a sysctl which allows the default SME vector length to be configured. Signed-off-by: Mark Brown --- arch/arm64/kernel/fpsimd.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index f9b77d0b8e40..9b247d13c3fe 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -479,6 +479,30 @@ static int __init sve_sysctl_init(void) static int __init sve_sysctl_init(void) { return 0; } #endif /* ! (CONFIG_ARM64_SVE && CONFIG_SYSCTL) */ +#if defined(CONFIG_ARM64_SME) && defined(CONFIG_SYSCTL) +static struct ctl_table sme_default_vl_table[] = { + { + .procname = "sme_default_vector_length", + .mode = 0644, + .proc_handler = vec_proc_do_default_vl, + .extra1 = &vl_info[ARM64_VEC_SME], + }, + { } +}; + +static int __init sme_sysctl_init(void) +{ + if (system_supports_sme()) + if (!register_sysctl("abi", sme_default_vl_table)) + return -EINVAL; + + return 0; +} + +#else /* ! (CONFIG_ARM64_SME && CONFIG_SYSCTL) */ +static int __init sme_sysctl_init(void) { return 0; } +#endif /* ! (CONFIG_ARM64_SME && CONFIG_SYSCTL) */ + #define ZREG(sve_state, vq, n) ((char *)(sve_state) + \ (SVE_SIG_ZREG_OFFSET(vq, n) - SVE_SIG_REGS_OFFSET)) @@ -1684,6 +1708,9 @@ static int __init fpsimd_init(void) if (cpu_have_named_feature(SME) && !cpu_have_named_feature(SVE)) pr_notice("SME is implemented but not SVE\n"); - return sve_sysctl_init(); + sve_sysctl_init(); + sme_sysctl_init(); + + return 0; } core_initcall(fpsimd_init);