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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, 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 48ABFC5DF62 for ; Wed, 6 Nov 2019 09:42:59 +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 13E292166E for ; Wed, 6 Nov 2019 09:42:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="USpM2K6l"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="QxrXnOkq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 13E292166E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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=b8Ddd51tnS+ErN22F6IlsRuXt0Ij1HeeoEpDtWbmQ74=; b=USpM2K6lhs7rrlqAZpUAg9bXHk 39+mFw8cWZFSdDTlpsYgzpcRDyUTvlVmqEADO35IJRu44dtt8g+mLbfwUz03VyPG0IvKj8JrWwhje U+J4OiGfsmuFonB5pG6pVYJAV4Vh1L+YdsSU7WnAEprDljYU4m9Sabr+Hnu0fusjD2BKKtea2jLEW e3GwZrCEog54NLecpxVZMTexSjqPQCF+uPX5sDOKlXPJngdJDkZ+PJO6SHGnj4n/K+qBqn9/fwYLM JoDScgeV0hH3hJ0nRVQViJEpzxaUEbZxTo8Ue+t59P1FVNdxN+Hbgye579WKjl0zI1qt1zBf/JDnU ooDa4yTQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSHq4-0005LK-Tw; Wed, 06 Nov 2019 09:42:56 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSHpj-0004w5-Et for linux-arm-kernel@lists.infradead.org; Wed, 06 Nov 2019 09:42:36 +0000 Received: from e123331-lin.home (lfbn-mar-1-643-104.w90-118.abo.wanadoo.fr [90.118.215.104]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 53D2E2166E; Wed, 6 Nov 2019 09:42:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573033355; bh=Xpce4/ws0tivXiJphl965VRfX0ymYGfscPagSV/Lc+A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QxrXnOkqfSMB/uEQXUrwbnj2y+B6OqkECeKJMSqFor5flsu07VDZWtHa+ActjEKTY qB4azmQFNq2Du7+wp1or2VzlyvAHKVZzF7A1U+pKkz8moXqfvF8z4lQ4fq5Ho9uhRe nCMd90qWmhlp/YLJnxbHTptUMFR2HJbl6IJ21hmA= From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/2] Revert "ARM: 8857/1: efi: enable CP15 DMB instructions before cleaning the cache" Date: Wed, 6 Nov 2019 10:42:19 +0100 Message-Id: <20191106094219.24365-3-ardb@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191106094219.24365-1-ardb@kernel.org> References: <20191106094219.24365-1-ardb@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191106_014235_538605_6B14A0DC X-CRM114-Status: GOOD ( 11.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel 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 This reverts commit e17b1af96b2afc38e684aa2f1033387e2ed10029, which is no longer necessary now that the v7 specific routines take care not to issue CP15 barrier instructions before they are enabled in SCTLR. Signed-off-by: Ard Biesheuvel --- arch/arm/boot/compressed/head.S | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index ec14687aea3c..4369f491b23d 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -1462,21 +1462,7 @@ ENTRY(efi_stub_entry) @ Preserve return value of efi_entry() in r4 mov r4, r0 - - @ our cache maintenance code relies on CP15 barrier instructions - @ but since we arrived here with the MMU and caches configured - @ by UEFI, we must check that the CP15BEN bit is set in SCTLR. - @ Note that this bit is RAO/WI on v6 and earlier, so the ISB in - @ the enable path will be executed on v7+ only. - mrc p15, 0, r1, c1, c0, 0 @ read SCTLR - tst r1, #(1 << 5) @ CP15BEN bit set? - bne 0f - orr r1, r1, #(1 << 5) @ CP15 barrier instructions - mcr p15, 0, r1, c1, c0, 0 @ write SCTLR - ARM( .inst 0xf57ff06f @ v7+ isb ) - THUMB( isb ) - -0: bl cache_clean_flush + bl cache_clean_flush bl cache_off @ Set parameters for booting zImage according to boot protocol -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel