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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 251B5C432BE for ; Fri, 30 Jul 2021 09:41:33 +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 E6EDE60EFD for ; Fri, 30 Jul 2021 09:41:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E6EDE60EFD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ykAILCyhIrHJQQBhxe8LU1CTZ78UFdv662Ok/va5Ow0=; b=AXSQFqI1htT7bf ZozTZIHSZGgIkxudlwE9ruyl3PFPWOP8UYX/urANsDln5zNsRoRDanPJvj93NvNIhjIjzFi97vn9a K5UlkoYx5GAJehKDcNf5KiboGTN1YmirjDebRj0IFLRQ6Yg70ih/QJHJ4/NOLBYlu9/8iGi77avEt rj5xE51KiiGgbmsUoYJTOsmQd7iLOiFDC/R3aYYfsDEDZ0ZCFtu1KyUZtREUvbVxRZcH6XfQ7ohAt 1sZqu9MW1GHZK1DcTZ3A5VJ3vuXIB/geM3qmZYpTv1ZGEcsiVSSBOT4cG9psetfOwI1o7dpetJDFr AR8xQqC3mRrvmZk4Uqxg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m9OzN-007wk4-O3; Fri, 30 Jul 2021 09:39:33 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m9OzG-007wi3-PT for linux-arm-kernel@lists.infradead.org; Fri, 30 Jul 2021 09:39:28 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9BE68603E9; Fri, 30 Jul 2021 09:39:24 +0000 (UTC) Date: Fri, 30 Jul 2021 10:39:21 +0100 From: Catalin Marinas To: Guangbin Huang Cc: davem@davemloft.net, kuba@kernel.org, will@kernel.org, maz@kernel.org, mark.rutland@arm.com, dbrazdil@google.com, qperret@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, lipeng321@huawei.com Subject: Re: [PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging Message-ID: <20210730093921.GA8570@arm.com> References: <1627614864-50824-1-git-send-email-huangguangbin2@huawei.com> <1627614864-50824-2-git-send-email-huangguangbin2@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1627614864-50824-2-git-send-email-huangguangbin2@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210730_023926_893948_7AC9B6BB X-CRM114-Status: GOOD ( 16.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jul 30, 2021 at 11:14:21AM +0800, Guangbin Huang wrote: > From: Xiongfeng Wang > > DGH prohibits merging memory accesses with Normal-NC or Device-GRE > attributes before the hint instruction with any memory accesses > appearing after the hint instruction. Provide macros to expose it to the > arch code. > > Signed-off-by: Xiongfeng Wang > Signed-off-by: Cheng Jian > Signed-off-by: Yufeng Mo > --- > arch/arm64/include/asm/assembler.h | 7 +++++++ > arch/arm64/include/asm/barrier.h | 1 + > 2 files changed, 8 insertions(+) > > diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h > index 89faca0e740d..5a3348b5e9f3 100644 > --- a/arch/arm64/include/asm/assembler.h > +++ b/arch/arm64/include/asm/assembler.h > @@ -90,6 +90,13 @@ > .endm > > /* > + * Data gathering hint > + */ > + .macro dgh > + hint #6 > + .endm Do we need this macro? It doesn't seem to be used anywhere. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel