From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FD2FC43387 for ; Fri, 18 Jan 2019 16:48:30 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0D18720883 for ; Fri, 18 Jan 2019 16:48:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gamVBPK6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D18720883 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=Cf8+SeBWlglkJcDdeP0iNG+qlGRyG3lBMDEJAQmgspU=; b=gamVBPK6912mB4CzXpv90sPyw/ RJ4ep3BCsNSKqDUxq9iNPvVqhYUpjBuMLO7eEw41j1wNTVpyTOv3bWmk7gyfd6b4HLuZdXpN6yQAP D9Fw5H5ZvhlhBEpC/KehvTlaI/k1vgoVwb47eMVEeg32Jvoxvtd5PlqZrl1HjEvNZuwGxuaklPGnC 4ES7yUuYGJP7vcqsE8+m6ciGPUNewChma6OXLtwcEA3UjsBqwrdzNyBpT2rAnk6THM063BtP4Hjjp S0khOsR6w41KtWCpR5Hlv9VQHjtJC3+ZbhsfY32273G3x++JOwSMfXWaaofJ3HVU4ZzxGA8qSgG1q ZZ0dBC6A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gkXJf-00017P-MX; Fri, 18 Jan 2019 16:48:23 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gkXI9-00087l-CU for linux-arm-kernel@lists.infradead.org; Fri, 18 Jan 2019 16:47:00 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D33801596; Fri, 18 Jan 2019 08:46:48 -0800 (PST) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 12F2B3F7BE; Fri, 18 Jan 2019 08:46:46 -0800 (PST) From: Julien Grall To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 6/8] arm64/sve: Implement helper to load SVE registers from FPSIMD state Date: Fri, 18 Jan 2019 16:46:08 +0000 Message-Id: <20190118164610.8123-7-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190118164610.8123-1-julien.grall@arm.com> References: <20190118164610.8123-1-julien.grall@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190118_084649_922624_D7C0ACA1 X-CRM114-Status: GOOD ( 11.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tokamoto@jp.fujitsu.com, Anton.Kirilov@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, oleg@redhat.com, Julien Grall , alex.bennee@linaro.org, Dave.Martin@arm.com, Daniel.Kiss@arm.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org In a follow-up patch, we may save the FPSIMD rather than the full SVE state when the state has to be zeroed on return to userspace (e.g during a syscall). Introduce an helper to load SVE vectors from FPSIMD state and zero the rest of SVE registers. Signed-off-by: Julien Grall --- arch/arm64/include/asm/fpsimd.h | 3 +++ arch/arm64/kernel/entry-fpsimd.S | 17 +++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index fa2439205c35..859c2c108f92 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -82,6 +82,9 @@ extern void sve_load_state(void const *state, u32 const *pfpsr, extern void sve_flush_live(void); +extern void sve_load_from_fpsimd_state(struct user_fpsimd_state const *state, + unsigned long vq_minus_1); + extern unsigned int sve_get_vl(void); struct arm64_cpu_capabilities; diff --git a/arch/arm64/kernel/entry-fpsimd.S b/arch/arm64/kernel/entry-fpsimd.S index 17121a51c41f..35c21a707730 100644 --- a/arch/arm64/kernel/entry-fpsimd.S +++ b/arch/arm64/kernel/entry-fpsimd.S @@ -58,6 +58,23 @@ ENTRY(sve_get_vl) ret ENDPROC(sve_get_vl) +/* + * Load SVE state from FPSIMD state. + * + * x0 = pointer to struct fpsimd_state + * x1 = VQ - 1 + * + * Each SVE vector will be loaded with the first 128-bits taken from FPSIMD + * and the rest zeroed. All the other SVE registers will be zeroed. + */ +ENTRY(sve_load_from_fpsimd_state) + sve_load_vq x1, x2, x3 + fpsimd_restore x0, 8 + _for n, 0, 15, _sve_pfalse \n + _sve_wrffr 0 + ret +ENDPROC(sve_load_from_fpsimd_state) + /* Zero all SVE registers but the first 128-bits of each vector */ ENTRY(sve_flush_live) sve_flush -- 2.11.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel