From patchwork Mon Nov 20 22:56:31 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: 745995 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Vw3oeeAq" Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C92B0C1 for ; Mon, 20 Nov 2023 14:56:37 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38FDBC433C7; Mon, 20 Nov 2023 22:56:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700520997; bh=zYzjASgAhGCTwD/qqoBAN9DxzzXgVpa3MZatwKVfpF0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vw3oeeAq9rUfY/KoFMXLCChSbMvrxrrlJsPXnTY5+gok/C31GXZcayjxzg/lA0dKE vxcuRL5Ygeg6IuJt6UJobaSM+f6WfYTo+gxtBQG5OOkCwTXnqkDkabzoKIuiHEr1Cz ZbOTniWqRrMdbVmsfUs3rUtpSLjmdIglywYHxcNyiW3lBI0G5OhrPj6qt18H+jISGV +6nVSDO9LJP1v6kEK2BmMy1ITGx21TMuxhACN9gABDfa5QdEnLcct4fSknyejMqINs X7zxyRCglX3KZMgLEln1zV5QAPsMPBjk/e8DNDSFg4Wo5eGv2qeYLLfUQXFPKCGYWV WQMJnuRF8cx8w== 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 v2 2/2] scsi: sd: fix system start for ATA devices Date: Tue, 21 Nov 2023 07:56:31 +0900 Message-ID: <20231120225631.37938-3-dlemoal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231120225631.37938-1-dlemoal@kernel.org> References: <20231120225631.37938-1-dlemoal@kernel.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 It 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 */