From patchwork Tue Oct 19 17:22:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12570713 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AF347C433F5 for ; Tue, 19 Oct 2021 17:24:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 965B76135F for ; Tue, 19 Oct 2021 17:24:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234623AbhJSR0s (ORCPT ); Tue, 19 Oct 2021 13:26:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:54822 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234613AbhJSR0r (ORCPT ); Tue, 19 Oct 2021 13:26:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D074D610E5; Tue, 19 Oct 2021 17:24:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1634664274; bh=+C9MV9SABbDylMTq/cdciwMD8BqPUU53XJ1T9g2XfGs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RXwQ6cUzFgCDotsQCLrpSKtSwOxJ0i69M9dXxTOw1Tuc6yxt6UiJT0FY9nYiuDLFF X9BIZjOHZT37vbK3i/z+qfey1y8oocKzP0AKGROI7SM0c1fyD9soPusqtfAqhJK3I/ w6LsW30z76/FtT/7gXtcRkx9NfK5MQ8DuMI/qtUFmGprMcGA1l5KU1QxgeUu2jLQEc EthVETwWAbNDPy+fu85Qd7hbxfjwihK48z4DhYF1rFFxHjyubo3/JzmWVdbYtr4DeL 0b77PB5z9o7EjyHl7Wdr6c6zD+Hg8nKjvKUDG7icXN/RmIgDtd2P/Jvbp8JoO7M34c 2odsHCzSeli+g== 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 v3 21/42] arm64/sme: Implement sysctl to set the default vector length Date: Tue, 19 Oct 2021 18:22:26 +0100 Message-Id: <20211019172247.3045838-22-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211019172247.3045838-1-broonie@kernel.org> References: <20211019172247.3045838-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1673; h=from:subject; bh=+C9MV9SABbDylMTq/cdciwMD8BqPUU53XJ1T9g2XfGs=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBhbv7U04yVXWBjoin8/CMkb2S9VuFzqdeY8tKRaST7 bEKDoTiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYW7+1AAKCRAk1otyXVSH0Aj1B/ 4oUepMcf3calVSwIp7YE2SDVgmipH7R11QvF7z4e5L6DRnNShInkPPCtrq0O+fUb71PxBrCRl8bhgH QVXktFgnqPoefvCx4rHuodkLLejXTa10lrgQAMFoisb7pUuJREsS4WbDlSQPObuIjSctAsbMtu3JN1 SQvBzRSiKHiARuSNp5SiBXEeJYWyu6qaT80IiuV+sNlchvz76bR+PJL23oZ+TReDiE5QfyIt1CsOYh UJbtpMGcorLlW5yXRvV4aNi6CxPNlh4Xai7leya7lDfPNfD0wHrAerEEfqx9NENavr2yTtQ675KOAa sPD6ByxEq25nB0ScvOBuqjW6bFiyHy 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 2da7c955d275..9c2b3893f14d 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -482,6 +482,30 @@ 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)) @@ -1676,6 +1700,9 @@ 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);