From patchwork Mon Dec 19 22:02:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Elliott, Robert (Servers)" X-Patchwork-Id: 13077190 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 5DF1BC4332F for ; Mon, 19 Dec 2022 22:03:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232761AbiLSWDh (ORCPT ); Mon, 19 Dec 2022 17:03:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60758 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232840AbiLSWDU (ORCPT ); Mon, 19 Dec 2022 17:03:20 -0500 Received: from mx0a-002e3701.pphosted.com (mx0a-002e3701.pphosted.com [148.163.147.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D42F140C6; Mon, 19 Dec 2022 14:03:19 -0800 (PST) Received: from pps.filterd (m0148663.ppops.net [127.0.0.1]) by mx0a-002e3701.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2BJL5BJ4004423; Mon, 19 Dec 2022 22:02:47 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hpe.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pps0720; bh=DUz+WsoLUu9ZHA+z71TaCHVliVtTYVa80yxAm1HKF4g=; b=RW6sKc9BEWBI+rYS8eckIaK7NhIc+uCvrxlgKBPBVyU17Ir5g1ATwZVhFr8RV4hy2IO1 pNjJM+Kkt1DlUldQ3RS3phZwXdOUnoRSP2yxdAloCK0r5p3BhHgYhIakYGlriIvCUVuG hYKeXIivWtOcwMRDjovRrbjxQv3P3qRNTp7HFo6GK+smWP5+aaPh8lRwWG+O6cPG/9Kh YBUq2metVJc6XBwcbOmp4ASPSh4IonJD7FVC3DmsiFE7aMxcb3T11YvD7gsrQekRZHli A9KcA1NuAHJVzUho6WNoSqc6Dozkwlw3OLwLcVNgbFJdRmwpjJxiotcUtvghs8rDjdv7 Lg== Received: from p1lg14879.it.hpe.com (p1lg14879.it.hpe.com [16.230.97.200]) by mx0a-002e3701.pphosted.com (PPS) with ESMTPS id 3mjyd5rcwj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 19 Dec 2022 22:02:47 +0000 Received: from p1lg14885.dc01.its.hpecorp.net (unknown [10.119.18.236]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by p1lg14879.it.hpe.com (Postfix) with ESMTPS id 3735731099; Mon, 19 Dec 2022 22:02:46 +0000 (UTC) Received: from adevxp033-sys.us.rdlabs.hpecorp.net (unknown [16.231.227.36]) by p1lg14885.dc01.its.hpecorp.net (Postfix) with ESMTP id 5F9DF8061BF; Mon, 19 Dec 2022 22:02:45 +0000 (UTC) From: Robert Elliott To: herbert@gondor.apana.org.au, davem@davemloft.net, Jason@zx2c4.com, ardb@kernel.org, ap420073@gmail.com, David.Laight@ACULAB.COM, ebiggers@kernel.org, tim.c.chen@linux.intel.com, peter@n8pjl.ca, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: linux-crypto@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Robert Elliott Subject: [PATCH 02/13] x86: add yield FPU context utility function Date: Mon, 19 Dec 2022 16:02:12 -0600 Message-Id: <20221219220223.3982176-3-elliott@hpe.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221219220223.3982176-1-elliott@hpe.com> References: <20221219220223.3982176-1-elliott@hpe.com> MIME-Version: 1.0 X-Proofpoint-GUID: Gvjh4KDpMzFEWSzZRj7nTCTBt22lX88l X-Proofpoint-ORIG-GUID: Gvjh4KDpMzFEWSzZRj7nTCTBt22lX88l X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-19_01,2022-12-15_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 phishscore=0 malwarescore=0 clxscore=1015 mlxlogscore=709 bulkscore=0 priorityscore=1501 adultscore=0 impostorscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2212190193 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Add a function that may be called to avoid hogging the CPU between kernel_fpu_begin() and kernel_fpu_end() calls. Signed-off-by: Robert Elliott --- arch/x86/include/asm/simd.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/x86/include/asm/simd.h b/arch/x86/include/asm/simd.h index bd9c672a2792..2c887dec95a2 100644 --- a/arch/x86/include/asm/simd.h +++ b/arch/x86/include/asm/simd.h @@ -3,6 +3,7 @@ #define _ASM_X86_SIMD_H #include +#include /* * may_use_simd - whether it is allowable at this time to issue SIMD @@ -13,4 +14,22 @@ static __must_check inline bool may_use_simd(void) return irq_fpu_usable(); } +/** + * kernel_fpu_relax - pause FPU preemption if scheduler wants + * + * Call this periodically during long loops between kernel_fpu_begin() + * and kernel_fpu_end() calls to avoid hogging the CPU if the + * scheduler wants to use the CPU for another thread + * + * Return: none + */ +static inline void kernel_fpu_yield(void) +{ + if (need_resched()) { + kernel_fpu_end(); + cond_resched(); + kernel_fpu_begin(); + } +} + #endif /* _ASM_X86_SIMD_H */