[{"id":1794836,"web_url":"http://patchwork.ozlabs.org/comment/1794836/","msgid":"<20171027125622.75rqvb2kyr4wqhr4@armageddon.cambridge.arm.com>","list_archive_url":null,"date":"2017-10-27T12:56:22","subject":"Re: [PATCH v4 16/28] arm64/sve: Probe SVE capabilities and usable\n\tvector lengths","submitter":{"id":938,"url":"http://patchwork.ozlabs.org/api/people/938/","name":"Catalin Marinas","email":"catalin.marinas@arm.com"},"content":"On Fri, Oct 27, 2017 at 11:50:58AM +0100, Dave P Martin wrote:\n> This patch uses the cpufeatures framework to determine common SVE\n> capabilities and vector lengths, and configures the runtime SVE\n> support code appropriately.\n> \n> ZCR_ELx is not really a feature register, but it is convenient to\n> use it as a template for recording the maximum vector length\n> supported by a CPU, using the LEN field. This field is similar to\n> a feature field in that it is a contiguous bitfield for which we\n> want to determine the minimum system-wide value. This patch adds\n> ZCR as a pseudo-register in cpuinfo/cpufeatures, with appropriate\n> custom code to populate it. Finding the minimum supported value of\n> the LEN field is left to the cpufeatures framework in the usual\n> way.\n> \n> The meaning of ID_AA64ZFR0_EL1 is not architecturally defined yet,\n> so for now we just require it to be zero.\n> \n> Note that much of this code is dormant and SVE still won't be used\n> yet, since system_supports_sve() remains hardwired to false.\n> \n> Signed-off-by: Dave Martin \n> Reviewed-by: Suzuki K Poulose \n> Cc: Alex Bennée \n> Cc: Catalin Marinas \n\nReviewed-by: Catalin Marinas ","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org\n\theader.b=\"FoV84QdW\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3yNkRS0pzHz9ryk\n\tfor ;\n\tFri, 27 Oct 2017 23:57:08 +1100 (AEDT)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1e84C8-0005Ds-Ij; Fri, 27 Oct 2017 12:57:04 +0000","from foss.arm.com ([217.140.101.70])\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1e84Br-0005B8-KP for linux-arm-kernel@lists.infradead.org;\n\tFri, 27 Oct 2017 12:56:49 +0000","from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249])\n\tby usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 640BA1529;\n\tFri, 27 Oct 2017 05:56:27 -0700 (PDT)","from armageddon.cambridge.arm.com (armageddon.cambridge.arm.com\n\t[10.1.206.84])\n\tby usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id\n\t871243F246; Fri, 27 Oct 2017 05:56:25 -0700 (PDT)"],"DKIM-Signature":"v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20170209; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:\n\tMessage-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=J6rcv6BYTzuTjMqTFApuyCPAvZtK0xgoVnGt6sfxu+M=;\n\tb=FoV84QdW4F0C+H\n\tDY80gbXo+qty5sSqiTWmW7B1aQ2oQhlFKzeN4eXyR3PEA+GYcmvKlPfgYTplNdT9jRcPK+crQV04K\n\tZZhF2dDwOjNuWYiVF0YngtmLe7+NP1hW5U3qCmF3yZvNLKlpbWsmVLJ078E2qju5WMaUNZtv1V/f2\n\tF5ri0XewUkyWJ0xmplnDLgPsMLWcWmtuWFEziqQA3kwkVvR65lrkP4FG2mGgf3ktjUUQS7v3HeV2Z\n\thoGOPv0iNFdLGfSSmtT8NgtUbl2xOpe5tkG5sw4lnUmLEMGA8oO4L90Vr6YhJOy2hvAZBD5Hdb33W\n\tNF7cHfMYVSbtwgddzAlQ==;","Date":"Fri, 27 Oct 2017 13:56:22 +0100","From":"Catalin Marinas ","To":"Dave Martin ","Subject":"Re: [PATCH v4 16/28] arm64/sve: Probe SVE capabilities and usable\n\tvector lengths","Message-ID":"<20171027125622.75rqvb2kyr4wqhr4@armageddon.cambridge.arm.com>","References":"<1509101470-7881-1-git-send-email-Dave.Martin@arm.com>\n\t<1509101470-7881-17-git-send-email-Dave.Martin@arm.com>","MIME-Version":"1.0","Content-Disposition":"inline","In-Reply-To":"<1509101470-7881-17-git-send-email-Dave.Martin@arm.com>","User-Agent":"NeoMutt/20170113 (1.7.2)","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20171027_055647_674381_D46F7587 ","X-CRM114-Status":"GOOD ( 13.64 )","X-Spam-Score":"-6.9 (------)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-6.9 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/,\n\thigh trust [217.140.101.70 listed in list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay\n\tdomain\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"linux-arch@vger.kernel.org, Okamoto Takayuki ,\n\tlibc-alpha@sourceware.org, Ard Biesheuvel , \n\tSzabolcs Nagy , Will Deacon ,\n\tAlex =?iso-8859-1?q?Benn=E9e?= ,\n\tkvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org","Content-Type":"text/plain; charset=\"iso-8859-1\"","Content-Transfer-Encoding":"quoted-printable","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}}]