From patchwork Mon Nov 20 07:35:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 13460891 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36F6AC54FB9 for ; Mon, 20 Nov 2023 07:35:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231948AbjKTHfg (ORCPT ); Mon, 20 Nov 2023 02:35:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229952AbjKTHfc (ORCPT ); Mon, 20 Nov 2023 02:35:32 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF4C4D69 for ; Sun, 19 Nov 2023 23:35:28 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5AC0AC433CA; Mon, 20 Nov 2023 07:35:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700465728; bh=IibOv3d/NIOLxPBBsvNQekxz/R+6XjKVCbUCr6Vb3G8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iS25Z2FwO7xDKMcdFjxoFKBSS06K4FHTLwxxKUbrM+6jJyIC+ZLlB02IkmAdwij73 Rg9KfBAgbCSGRkYr/VuUVC3/Gwqn8JYFXsTDyNSOs0yCv3o++AP6f4iGMhkSzmj3S0 HOvuOxmEBK1L0z38qsCQfBgxmyDKwkxvr7uceKO6/6whA2h+Zfc8MFJdW1+Q50/wbt +mpF95PSJr6NlYW/UuHkVpwoRbW12iaZkHPZWEsm1qqAImYXaeLzdfamcdZI2BlrwA fbyO+aYvphEMn3GDKiCHhOUGJYUciajfNZsl6tfllw3eGW9j6Kneavv504xMOUrHQf 7aXnVf/djk+Bw== From: Damien Le Moal To: "Martin K . Petersen" , James Bottomley , linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org Cc: Bart Van Assche , Phillip Susi Subject: [PATCH 2/2] scsi: sd: fix system start for ATA devices Date: Mon, 20 Nov 2023 16:35:22 +0900 Message-ID: <20231120073522.34180-3-dlemoal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231120073522.34180-1-dlemoal@kernel.org> References: <20231120073522.34180-1-dlemoal@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Ti is not always possible to keep a device in the runtime suspended state when a system level suspend/resume cycle is executed. E.g. for ATA devices connected to AHCI adapters, system resume resets the ATA ports, which causes connected devices to spin up. In such case, a runtime suspended disk will incorrectly be seen with a suspended runtime state because the device is not resumed by sd_resume_system(). The power state seen by the user is different than the actual device physical power state. Fix this issue by introducing the struct scsi_device flag force_runtime_start_on_system_start. When set, this flag causes sd_resume_system() to request a runtime resume operation for runtime suspended devices. This results in the user seeing the device runtime_state as active after a system resume, thus correctly reflecting the device physical power state. Fixes: 9131bff6a9f1 ("scsi: core: pm: Only runtime resume if necessary") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal --- drivers/ata/libata-scsi.c | 5 +++++ drivers/scsi/sd.c | 9 ++++++++- include/scsi/scsi_device.h | 6 ++++++ 3 files changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 63317449f6ea..0a0f483124c3 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -1055,9 +1055,14 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev) * Ask the sd driver to issue START STOP UNIT on runtime suspend * and resume and shutdown only. For system level suspend/resume, * devices power state is handled directly by libata EH. + * Given that disks are always spun up on system resume, also + * make sure that the sd driver forces runtime suspended disks + * to be resumed to correctly reflect the power state of the + * device. */ sdev->manage_runtime_start_stop = 1; sdev->manage_shutdown = 1; + sdev->force_runtime_start_on_system_start = 1; } /* diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index fa00dd503cbf..542a4bbb21bc 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3949,8 +3949,15 @@ static int sd_resume(struct device *dev, bool runtime) static int sd_resume_system(struct device *dev) { - if (pm_runtime_suspended(dev)) + if (pm_runtime_suspended(dev)) { + struct scsi_disk *sdkp = dev_get_drvdata(dev); + struct scsi_device *sdp = sdkp ? sdkp->device : NULL; + + if (sdp && sdp->force_runtime_start_on_system_start) + pm_request_resume(dev); + return 0; + } return sd_resume(dev, false); } diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 1fb460dfca0c..5ec1e71a09de 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -181,6 +181,12 @@ struct scsi_device { */ unsigned manage_shutdown:1; + /* + * If set and if the device is runtime suspended, ask the high-level + * device driver (sd) to force a runtime resume of the device. + */ + unsigned force_runtime_start_on_system_start:1; + unsigned removable:1; unsigned changed:1; /* Data invalid due to media change */ unsigned busy:1; /* Used to prevent races */