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=-18.2 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_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 7DDFFC4338F for ; Fri, 23 Jul 2021 06:21:57 +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 4B1C660E78 for ; Fri, 23 Jul 2021 06:21:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4B1C660E78 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.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:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OZ7aZujU4atTYcUuJ7onNH+9Ivuh8PFHnpYg2oWu9L0=; b=I8KdcIP0mycKyz wvE1uUU3C6NroVFn98NyFAbgnGrcyiPnSQvWFYn0QsU0M+gWVaenRSHd5Kp3AO+kFtonNLL7iZkcY 7fQeu+R8tKQcJR4VQN0VagKDwRfANx5K8laY0odUIJPi76nqksOysx4ihBTQZLzOhQCPec81bLam+ D1KK2UnZKBB1emkvaMvlCznPZVjKCkqginBQZKz0PRc3yJzG8Dg82XnqZAE7rjtJnzt544/Y6QKBE 52tpaHDJTqOcWDyTL0BtF2ggTcoowBRBP9w4aclbYZcaiy9wDg6cLyP/H2IGqcgElJst8eYAR9+ym ZfSa4EvOwR6JQoYBGpXg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m6oXs-003WP6-Df; Fri, 23 Jul 2021 06:20:28 +0000 Received: from szxga03-in.huawei.com ([45.249.212.189]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m6oXD-003WDq-P1 for linux-arm-kernel@lists.infradead.org; Fri, 23 Jul 2021 06:19:50 +0000 Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.56]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4GWJvX3Gfhz7wpK; Fri, 23 Jul 2021 14:15:04 +0800 (CST) Received: from dggemi759-chm.china.huawei.com (10.1.198.145) by dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2176.2; Fri, 23 Jul 2021 14:19:42 +0800 Received: from localhost.localdomain (10.67.165.24) by dggemi759-chm.china.huawei.com (10.1.198.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Fri, 23 Jul 2021 14:19:41 +0800 From: Guangbin Huang To: , , , , , , , CC: , , , , Subject: [RFC PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging Date: Fri, 23 Jul 2021 14:16:06 +0800 Message-ID: <1627020969-32945-2-git-send-email-huangguangbin2@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1627020969-32945-1-git-send-email-huangguangbin2@huawei.com> References: <1627020969-32945-1-git-send-email-huangguangbin2@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.165.24] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggemi759-chm.china.huawei.com (10.1.198.145) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210722_231948_060309_ACA8C1DB X-CRM114-Status: UNSURE ( 9.03 ) X-CRM114-Notice: Please train this message. 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 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 + +/* * RAS Error Synchronization barrier */ .macro esb diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h index 451e11e5fd23..02e1735706d2 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -22,6 +22,7 @@ #define dmb(opt) asm volatile("dmb " #opt : : : "memory") #define dsb(opt) asm volatile("dsb " #opt : : : "memory") +#define dgh() asm volatile("hint #6" : : : "memory") #define psb_csync() asm volatile("hint #17" : : : "memory") #define tsb_csync() asm volatile("hint #18" : : : "memory") #define csdb() asm volatile("hint #20" : : : "memory") -- 2.8.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel