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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 2ABC4C4338F for ; Fri, 23 Jul 2021 13:17:22 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 81B7E60EBC for ; Fri, 23 Jul 2021 13:17:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 81B7E60EBC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4GWVGm0T1tz30Fx for ; Fri, 23 Jul 2021 23:17:20 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=EHW0RAUX; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=farosas@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=EHW0RAUX; dkim-atps=neutral Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4GWVG84Ksyz302K for ; Fri, 23 Jul 2021 23:16:48 +1000 (AEST) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 16ND3eFX049686; Fri, 23 Jul 2021 09:16:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : subject : in-reply-to : references : date : message-id : mime-version : content-type; s=pp1; bh=UVQt0GuOeKk36RlYZ2dAkgT4CoJbUq2B09fX4wSvrCo=; b=EHW0RAUX7yvLTLkInVn0AP/U+4lP4bnMv879AooV+2s5vI/ZzONJRT9ufOQUAX6fCAeI MZzG5PgIJLBVfpVDVRDcJcr1wbG6KqDoSzoW39BcT9bVX7Il/6o3wARB8SUdV0GpSplq GeMLtqWmLKHM+Ib9OoCSBM+tdKGxiT6qVmVZs4GvD3SRsroe58VOd6OtBR7tIoMqSRay 9bIhMWRpc2qLudtrDuLNcgr7V+c/fCJ9hZddt4vj3hkutXZCwZqlT5/QDQ+wIEVqNPMd 64rBs1OeHCQsOMh5ZfO7bru9sUbe6JgVwy9pT1ozXfSwvwj8VOHnCj4Abgv6c9cH42Gp Nw== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 39yvxwbdj0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 23 Jul 2021 09:16:38 -0400 Received: from m0098396.ppops.net (m0098396.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 16ND4Sf3053233; Fri, 23 Jul 2021 09:16:38 -0400 Received: from ppma04dal.us.ibm.com (7a.29.35a9.ip4.static.sl-reverse.com [169.53.41.122]) by mx0a-001b2d01.pphosted.com with ESMTP id 39yvxwbdhm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 23 Jul 2021 09:16:37 -0400 Received: from pps.filterd (ppma04dal.us.ibm.com [127.0.0.1]) by ppma04dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 16ND74Oa018506; Fri, 23 Jul 2021 13:16:37 GMT Received: from b01cxnp22035.gho.pok.ibm.com (b01cxnp22035.gho.pok.ibm.com [9.57.198.25]) by ppma04dal.us.ibm.com with ESMTP id 39upufy0a7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 23 Jul 2021 13:16:37 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 16NDGaEY24051970 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 23 Jul 2021 13:16:36 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 25914112070; Fri, 23 Jul 2021 13:16:36 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5824F112065; Fri, 23 Jul 2021 13:16:35 +0000 (GMT) Received: from localhost (unknown [9.211.138.163]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTPS; Fri, 23 Jul 2021 13:16:34 +0000 (GMT) From: Fabiano Rosas To: "Pratik R. Sampat" , mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, kjain@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org, psampat@linux.ibm.com, pratik.r.sampat@gmail.com Subject: Re: [PATCH v7 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes In-Reply-To: <20210723054609.15033-2-psampat@linux.ibm.com> References: <20210723054609.15033-1-psampat@linux.ibm.com> <20210723054609.15033-2-psampat@linux.ibm.com> Date: Fri, 23 Jul 2021 10:16:32 -0300 Message-ID: <87r1fpcgr3.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: t4BzyVrfvVSyoZVsVv1DINHFabc5o9M_ X-Proofpoint-GUID: y1d1d4t_xEJ3rGTmbqYl9y8h4rjJ3Z2X X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-07-23_05:2021-07-23, 2021-07-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 malwarescore=0 spamscore=0 phishscore=0 mlxlogscore=999 suspectscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107230078 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" "Pratik R. Sampat" writes: > Adds a generic interface to represent the energy and frequency related > PAPR attributes on the system using the new H_CALL > "H_GET_ENERGY_SCALE_INFO". > > H_GET_EM_PARMS H_CALL was previously responsible for exporting this > information in the lparcfg, however the H_GET_EM_PARMS H_CALL > will be deprecated P10 onwards. > > The H_GET_ENERGY_SCALE_INFO H_CALL is of the following call format: > hcall( > uint64 H_GET_ENERGY_SCALE_INFO, // Get energy scale info > uint64 flags, // Per the flag request > uint64 firstAttributeId,// The attribute id > uint64 bufferAddress, // Guest physical address of the output buffer > uint64 bufferSize // The size in bytes of the output buffer > ); > > This H_CALL can query either all the attributes at once with > firstAttributeId = 0, flags = 0 as well as query only one attribute > at a time with firstAttributeId = id, flags = 1. > > The output buffer consists of the following > 1. number of attributes - 8 bytes > 2. array offset to the data location - 8 bytes > 3. version info - 1 byte > 4. A data array of size num attributes, which contains the following: > a. attribute ID - 8 bytes > b. attribute value in number - 8 bytes > c. attribute name in string - 64 bytes > d. attribute value in string - 64 bytes > > The new H_CALL exports information in direct string value format, hence > a new interface has been introduced in > /sys/firmware/papr/energy_scale_info to export this information to > userspace in an extensible pass-through format. > > The H_CALL returns the name, numeric value and string value (if exists) > > The format of exposing the sysfs information is as follows: > /sys/firmware/papr/energy_scale_info/ > |-- / > |-- desc > |-- value > |-- value_desc (if exists) > |-- / > |-- desc > |-- value > |-- value_desc (if exists) > ... > > The energy information that is exported is useful for userspace tools > such as powerpc-utils. Currently these tools infer the > "power_mode_data" value in the lparcfg, which in turn is obtained from > the to be deprecated H_GET_EM_PARMS H_CALL. > On future platforms, such userspace utilities will have to look at the > data returned from the new H_CALL being populated in this new sysfs > interface and report this information directly without the need of > interpretation. > > Signed-off-by: Pratik R. Sampat > Reviewed-by: Gautham R. Shenoy Reviewed-by: Fabiano Rosas