From patchwork Fri Feb 25 16:58:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12760640 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 B15DAC433F5 for ; Fri, 25 Feb 2022 17:35:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243770AbiBYRfn (ORCPT ); Fri, 25 Feb 2022 12:35:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242721AbiBYRfm (ORCPT ); Fri, 25 Feb 2022 12:35:42 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4AD2D1B1DC1 for ; Fri, 25 Feb 2022 09:35:10 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id DCC7B61DC5 for ; Fri, 25 Feb 2022 17:35:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC84BC36AE9; Fri, 25 Feb 2022 17:35:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645810509; bh=63WLTNdGExIQX5YPFJnvYTPc1abM1BlKePo1Mbbun/I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D+iJEWBIi8sCmDeS5J278O/Pkge9XmVD8wITXNtIuUxcNq2U04MMRfz8VQ449c6LM Ldu4KARrDkcLTutZjh3hxbYme2BcI49TqCGPScXjdie1QPK9BqMVtH0m39S+xZY2Jl +L0IVcpG/nwKG80qg7DqA9eQoWD0r1Yor1HNIyiHxL9LDksDJrDePOg9HhozMCsHZl 9pT50VZ4nnRRMjsh84E8Uy4odocWpG+tySYC6ViJYo1aesqZqHWEYcbSTTHF9k8tc8 3MPobV65b1dJhh3cK/W+zvjvrdrQSjTv1neSgMA9kl7Ce8B8tw+5xa21B8ig5/smTh 4VlR+w8wxQOjg== From: Mark Brown To: Catalin Marinas , Will Deacon , Marc Zyngier , Shuah Khan , Shuah Khan Cc: Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Mark Brown Subject: [PATCH v12 12/40] arm64/sme: Implement sysctl to set the default vector length Date: Fri, 25 Feb 2022 16:58:55 +0000 Message-Id: <20220225165923.1474372-13-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220225165923.1474372-1-broonie@kernel.org> References: <20220225165923.1474372-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1729; h=from:subject; bh=63WLTNdGExIQX5YPFJnvYTPc1abM1BlKePo1Mbbun/I=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBiGQrTjC8hD1eoKysYwTLKxyL2XncHCPgcwYLEKW4S gOXSpayJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYhkK0wAKCRAk1otyXVSH0GzPB/ 4wjaEoCOe68KBlmFOAMhqptA1bjr6CrO/cxWyrR6QPMOi6rTkdKS/q9kJzmUIXcqX56ydgjCdi5yFb kF8g4xdVbNd/hRyBqQLjtA0RBobaMEcnNQn5m2LHHLAhioFZECYqSURnVVxNgLXCsKhVrDJDGq3a32 XqKP/aEaX3VKZGBIxBi/Xn/0o8tprjJXYS8YTNtKS+77JPv6rWwCLZ/rNXf6fYlcc4OdvbBNw+kMQu cgMGb2XqbvU6klzgH7PX0mP5CN4NNwQMUH+7UO/0iF0ZDZyHdQL1ao2tQ20zhUTPq6frrIGVTQHiXe TQ9rtAMexasoJatT2z6/iLJLQmn7id 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 Reviewed-by: Catalin Marinas --- 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 3fb2167f8af7..841b9609342f 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -483,6 +483,30 @@ 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)) @@ -1681,6 +1705,9 @@ 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);