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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY 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 AB0D6C32792 for ; Tue, 1 Oct 2019 03:02:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B5D12087F for ; Tue, 1 Oct 2019 03:02:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="cAUQHJBn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732118AbfJADC3 (ORCPT ); Mon, 30 Sep 2019 23:02:29 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:49022 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727459AbfJADC2 (ORCPT ); Mon, 30 Sep 2019 23:02:28 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x912wgD1123860; Tue, 1 Oct 2019 03:01:55 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2019-08-05; bh=njwwrnTifs8mrKE8jnEn5CkrqleEPai9Gly5Yeav8D0=; b=cAUQHJBnGzWF7MI4SCB1phb0aN5MTzD42w+hscUrp5YyNRo0SBAeDZk7p6XUlx9A1YvJ a5fFO5Xf2uJqyeg+74iX3oia29430BC8/AeBFGmwwJs8+JN5RZxKxgg7wm6vjZu20YbQ 7/fva448QrBWI+oM1APP7CNCXfqhJD8QgJ9/SxoJiI3StDqrLPB0ZWiiillxyvrRUJ4D 4tipgv2m8KYHQgMnBQfi7Z8N6W1JGpHtNPJHzmtwUDM7GRGx9HPXlr5G6hcYCxCo8yXz c/HFJsggWJCdai0yZ/zGCogwfyTOeTeyoxXq3BQ+hT9qMPpMPEPtWIijsBKelYZAqGcg aA== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 2va05rjtda-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 01 Oct 2019 03:01:55 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x912whdC038056; Tue, 1 Oct 2019 03:01:54 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 2vbsm13ssp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 01 Oct 2019 03:01:54 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x9131nkm005437; Tue, 1 Oct 2019 03:01:49 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 30 Sep 2019 20:01:49 -0700 To: Stanley Chu Cc: , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v4 0/3] scsi: core: allow auto suspend override by low-level driver From: "Martin K. Petersen" Organization: Oracle Corporation References: <1568649411-5127-1-git-send-email-stanley.chu@mediatek.com> Date: Mon, 30 Sep 2019 23:01:45 -0400 In-Reply-To: <1568649411-5127-1-git-send-email-stanley.chu@mediatek.com> (Stanley Chu's message of "Mon, 16 Sep 2019 23:56:48 +0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9396 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=893 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910010029 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9396 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=973 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910010030 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Stanley, > Until now the scsi mid-layer forbids runtime suspend till userspace > enables it. This is mainly to quarantine some disks with broken > runtime power management or have high latencies executing suspend > resume callbacks. If the userspace doesn't enable the runtime suspend > the underlying hardware will be always on even when it is not doing > any useful work and thus wasting power. Applied to 5.5/scsi-queue, thank you! -- Martin K. Petersen Oracle Linux Engineering