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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT 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 44E33C3279B for ; Fri, 6 Jul 2018 12:39:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E305323E47 for ; Fri, 6 Jul 2018 12:39:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E305323E47 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933458AbeGFMjw (ORCPT ); Fri, 6 Jul 2018 08:39:52 -0400 Received: from alexa-out-blr-02.qualcomm.com ([103.229.18.198]:37620 "EHLO alexa-out-blr.qualcomm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933039AbeGFMio (ORCPT ); Fri, 6 Jul 2018 08:38:44 -0400 X-IronPort-AV: E=Sophos;i="5.51,316,1526322600"; d="scan'208";a="98687" Received: from ironmsg03-blr.qualcomm.com ([10.86.208.132]) by alexa-out-blr.qualcomm.com with ESMTP/TLS/AES256-SHA; 06 Jul 2018 18:00:51 +0530 X-IronPort-AV: E=McAfee;i="5900,7806,8945"; a="470255" Received: from asutoshd-linux.qualcomm.com ([10.206.24.163]) by ironmsg03-blr.qualcomm.com with ESMTP; 06 Jul 2018 18:00:51 +0530 Received: by asutoshd-linux.qualcomm.com (Postfix, from userid 92687) id 5E0C22FA6; Fri, 6 Jul 2018 18:00:50 +0530 (IST) From: Asutosh Das To: subhashj@codeaurora.org, cang@codeaurora.org, vivek.gautam@codeaurora.org, rnayak@codeaurora.org, vinholikatti@gmail.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org Cc: Sujit Reddy Thumma , linux-arm-msm@vger.kernel.org, Asutosh Das , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v1 2/9] scsi: Allow auto suspend override by low-level driver Date: Fri, 6 Jul 2018 18:00:29 +0530 Message-Id: <8135b00502f7e089478c9b988806ed40b7d5d40b.1530880006.git.asutoshd@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sujit Reddy Thumma 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. Some low-level drivers for the controllers can efficiently use runtime power management to reduce power consumption and improve battery life. Allow runtime suspend parameters override within the LLD itself instead of waiting for userspace to control the power management. Signed-off-by: Sujit Reddy Thumma Signed-off-by: Subhash Jadavani Signed-off-by: Asutosh Das --- drivers/scsi/scsi_scan.c | 4 ++++ drivers/scsi/scsi_sysfs.c | 3 ++- drivers/scsi/sd.c | 2 ++ include/scsi/scsi_device.h | 3 +++ 4 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 0880d97..5b7232a 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -969,6 +969,10 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, transport_configure_device(&sdev->sdev_gendev); + /* The LLD can override auto suspend tunables in ->slave_configure() */ + sdev->use_rpm_auto = 0; + sdev->autosuspend_delay = SCSI_DEFAULT_AUTOSUSPEND_DELAY; + if (sdev->host->hostt->slave_configure) { ret = sdev->host->hostt->slave_configure(sdev); if (ret) { diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 7943b76..706e778 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -1266,7 +1266,8 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev) device_enable_async_suspend(&sdev->sdev_gendev); scsi_autopm_get_target(starget); pm_runtime_set_active(&sdev->sdev_gendev); - pm_runtime_forbid(&sdev->sdev_gendev); + if (!sdev->use_rpm_auto) + pm_runtime_forbid(&sdev->sdev_gendev); pm_runtime_enable(&sdev->sdev_gendev); scsi_autopm_put_target(starget); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index a6201e6..205624f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3269,6 +3269,8 @@ static void sd_probe_async(void *data, async_cookie_t cookie) } blk_pm_runtime_init(sdp->request_queue, dev); + if (sdp->autosuspend_delay >= 0) + pm_runtime_set_autosuspend_delay(dev, sdp->autosuspend_delay); device_add_disk(dev, gd); if (sdkp->capacity) sd_dif_config_host(sdkp); diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 4c36af6..1d5ae90 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -197,7 +197,10 @@ struct scsi_device { unsigned broken_fua:1; /* Don't set FUA bit */ unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ + unsigned use_rpm_auto:1; /* Enable runtime PM auto suspend */ +#define SCSI_DEFAULT_AUTOSUSPEND_DELAY -1 + int autosuspend_delay; atomic_t disk_events_disable_depth; /* disable depth for disk events */ DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.