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=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 037B8C433E0 for ; Fri, 22 May 2020 15:50:15 +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 C59B320663 for ; Fri, 22 May 2020 15:50:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="MCC4TZg4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C59B320663 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:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject: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=U1LlDvBYnWK3FDXzLkDtZ3xpW1NTcMIQHh7gVnnDURU=; b=MCC4TZg4mVgjgr 5zEFfeLwQT5/xpx70npYZvwlaC2i1Cv0H9wd58ehYAEvtoim4JtNvQp5nT+XjvRR8jzxE3KQybhnl /I8lZDfjEiGJUK+CnO7pX/3Y6vxPP2vz3cQQ0Pup3EDYse4E8BlqI8GhbF9fPmQizUze05kRbI7fT bN1mrsDI+BME24pk+Pxz//OhjWv7F81A0Y9orEs9WyZn9M9q4SlS/zsjBTMn3lkAKJQprJGWpCtlg PGiGuTQmEGKT8s5Z8wEg2xixGSLysp1dmtG1N9zHVSHdUFJRoDjExu+dyVzjg9WarHhQoth5TjdN+ Av5kcnkw5hk0kdkOxWtA==; 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 1jc9w5-0000jJ-Fb; Fri, 22 May 2020 15:50:13 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jc9w1-0008QL-NM for linux-arm-kernel@lists.infradead.org; Fri, 22 May 2020 15:50:11 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1D76F55D; Fri, 22 May 2020 08:50:09 -0700 (PDT) Received: from gaia (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CB27D3F305; Fri, 22 May 2020 08:50:05 -0700 (PDT) Date: Fri, 22 May 2020 16:50:02 +0100 From: Catalin Marinas To: Zhenyu Ye Subject: Re: [PATCH v2 1/6] arm64: Detect the ARMv8.4 TTL feature Message-ID: <20200522155002.GF26492@gaia> References: <20200423135656.2712-1-yezhenyu2@huawei.com> <20200423135656.2712-2-yezhenyu2@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200423135656.2712-2-yezhenyu2@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-20200522_085009_824262_64EC20BD X-CRM114-Status: UNSURE ( 9.91 ) X-CRM114-Notice: Please train this message. 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: mark.rutland@arm.com, peterz@infradead.org, linux-mm@kvack.org, guohanjun@huawei.com, will@kernel.org, linux-arch@vger.kernel.org, yuzhao@google.com, aneesh.kumar@linux.ibm.com, steven.price@arm.com, arm@kernel.org, Dave.Martin@arm.com, arnd@arndb.de, suzuki.poulose@arm.com, npiggin@gmail.com, zhangshaokun@hisilicon.com, broonie@kernel.org, rostedt@goodmis.org, prime.zeng@hisilicon.com, kuhn.chenqun@huawei.com, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, xiexiangyou@huawei.com, linux-kernel@vger.kernel.org, maz@kernel.org, akpm@linux-foundation.org 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 On Thu, Apr 23, 2020 at 09:56:51PM +0800, Zhenyu Ye wrote: > From: Marc Zyngier > > In order to reduce the cost of TLB invalidation, the ARMv8.4 TTL > feature allows TLBs to be issued with a level allowing for quicker > invalidation. > > The TTL field indicates the level of page table walk > holding the leaf entry for the address being invalidated. > > Let's detect the feature for now. Further patches will implement > its actual usage. > > Signed-off-by: Marc Zyngier > Signed-off-by: Zhenyu Ye Reviewed-by: Catalin Marinas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel