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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 5C377CA9EAE for ; Tue, 29 Oct 2019 15:32:49 +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 26659208E3 for ; Tue, 29 Oct 2019 15:32:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="TdMV6MUC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 26659208E3 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-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1ZIQXG0+hXbVly1qFffKaVUJSd+p0W/XKcs1mVICrL4=; b=TdMV6MUCJlZ4jJpNuR1R1Skyn cqcCXo6+nKZNY4I3rnPrRRdXthzIUGebeNaJv2+XVs+QwNu/UP3ThyerrhihzN/hJ+SsZ3leF9M/P WaTcB2lXUl2ruIk88gYdYJ5cddJtj0beG+X+NdPn8HHM4T5nPSZ3J1wML93UVXjR0bBpc67hj140d Ydz/DAi26Kxk48cNp4j3BJmPLj2SJ0d60sf3/K2+15zF9zCSp/qhLM5KKEojVeakV4IXTxvzGaajQ zwlKXqXbw1l9PpAJdxJVFHZ7qe5fvIztHYTgh92Lp53m9juxIb9QkxKCA7++S8I2Y/AL9CBheFv32 21QZa4emA==; 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 1iPTUG-0004cv-I1; Tue, 29 Oct 2019 15:32:48 +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 1iPTUD-0004bm-87 for linux-arm-kernel@lists.infradead.org; Tue, 29 Oct 2019 15:32:46 +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 385511F1; Tue, 29 Oct 2019 08:32:44 -0700 (PDT) Received: from [10.1.196.50] (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6B1733F71F; Tue, 29 Oct 2019 08:32:43 -0700 (PDT) Subject: Re: [PATCH] arm64: cpufeature: Export Armv8.6 Matrix feature to userspace To: Will Deacon References: <20191025171056.30641-1-julien.grall@arm.com> <20191029111517.GE11590@willie-the-truck> <20191029113606.GB12103@willie-the-truck> From: Julien Grall Message-ID: <6f175c28-1ac0-3da0-bbfa-a811a4adfed7@arm.com> Date: Tue, 29 Oct 2019 15:32:42 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20191029113606.GB12103@willie-the-truck> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191029_083245_332621_30C42418 X-CRM114-Status: GOOD ( 13.55 ) 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: catalin.marinas@arm.com, Dave.Martin@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, suzuki.poulose@arm.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Will, On 29/10/2019 11:36, Will Deacon wrote: > On Tue, Oct 29, 2019 at 11:26:41AM +0000, Julien Grall wrote: >> On 29/10/2019 11:15, Will Deacon wrote: >>> On Fri, Oct 25, 2019 at 06:10:56PM +0100, Julien Grall wrote: >>>> This patch provides support for reporting the presence of Armv8.6 >>>> Matrix and its optional features to userspace. >>> >>> Are you sure this is 8.6 and not earlier? >> >> This was introduced by Armv8.6 see [1] but allowed to be used by Armv8.2 and >> onwards. > > That doesn't mean an awful lot though, especially then the features are > referred to in the docs as things like "ARMv8.2-F64MM". It is arguable. The feature were announced for Armv8.6 but made available for previous release. Anyway, I can remove the "Armv8.6" bits if that's the concern. Cheers, -- Julien Grall _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel