From patchwork Sat Sep 23 00:29:12 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: 725826 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 9A923CE7A89 for ; Sat, 23 Sep 2023 00:29:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230466AbjIWA3x (ORCPT ); Fri, 22 Sep 2023 20:29:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49274 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230440AbjIWA3p (ORCPT ); Fri, 22 Sep 2023 20:29:45 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2DEC1A8; Fri, 22 Sep 2023 17:29:39 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1243EC433C7; Sat, 23 Sep 2023 00:29:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695428979; bh=6/gHyN2ekZWWjPRG6Y55Waf1Y/Wfg30IYpSFTS1WmfE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cv0ltgDIPb9IJfbITwAu2L+WOOMZ9R3bUsZk21gUFrcjpshYztcw36I8Phk//brd3 T59Tm1EwIgigbgz3CM6hSIXzXxHlq0HEiTDPIEOBJ0Ybfr/5/U/NanJPfo192Ov2LM FNO0W9wxWA+jnXk0B6piex0f9cMw275ao1SUKlYFx9lN4tKZRem3ZVsVnC5qZ1yZy8 QyxE2XpW2iAuMrDPXqEt7ckONIpnImDZ7I5C1QBNhL3iQY+/hX5jgVd5PXlZJ8EyIS dD2onQCPBGQOxb2wAvJ9XxNc+fJ/h+zek3kI1yhGydpH7Om15jZ6UDLwCDspAgrrEi pCEOm8gKFt7/w== From: Damien Le Moal To: linux-ide@vger.kernel.org Cc: linux-scsi@vger.kernel.org, "Martin K . Petersen" , John Garry , Rodrigo Vivi , Paul Ausbeck , Kai-Heng Feng , Joe Breuer , Geert Uytterhoeven , Chia-Lin Kao Subject: [PATCH v6 03/23] ata: libata-scsi: link ata port and scsi device Date: Sat, 23 Sep 2023 09:29:12 +0900 Message-ID: <20230923002932.1082348-4-dlemoal@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230923002932.1082348-1-dlemoal@kernel.org> References: <20230923002932.1082348-1-dlemoal@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org There is no direct device ancestry defined between an ata_device and its scsi device which prevents the power management code from correctly ordering suspend and resume operations. Create such ancestry with the ata device as the parent to ensure that the scsi device (child) is suspended before the ata device and that resume handles the ata device before the scsi device. The parent-child (supplier-consumer) relationship is established between the ata_port (parent) and the scsi device (child) with the function device_add_link(). The parent used is not the ata_device as the PM operations are defined per port and the status of all devices connected through that port is controlled from the port operations. The device link is established with the new function ata_scsi_slave_alloc(), and this function is used to define the ->slave_alloc callback of the scsi host template of all ata drivers. Fixes: a19a93e4c6a9 ("scsi: core: pm: Rely on the device driver core for async power management") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Niklas Cassel Tested-by: Geert Uytterhoeven Reviewed-by: Martin K. Petersen Reviewed-by: John Garry --- drivers/ata/libata-scsi.c | 45 ++++++++++++++++++++++++++++++++++----- include/linux/libata.h | 2 ++ 2 files changed, 42 insertions(+), 5 deletions(-) diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index fb73c145b49a..8b43290ca2cd 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -1089,6 +1089,42 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev) return 0; } +/** + * ata_scsi_slave_alloc - Early setup of SCSI device + * @sdev: SCSI device to examine + * + * This is called from scsi_alloc_sdev() when the scsi device + * associated with an ATA device is scanned on a port. + * + * LOCKING: + * Defined by SCSI layer. We don't really care. + */ + +int ata_scsi_slave_alloc(struct scsi_device *sdev) +{ + struct ata_port *ap = ata_shost_to_port(sdev->host); + struct device_link *link; + + ata_scsi_sdev_config(sdev); + + /* + * Create a link from the ata_port device to the scsi device to ensure + * that PM does suspend/resume in the correct order: the scsi device is + * consumer (child) and the ata port the supplier (parent). + */ + link = device_link_add(&sdev->sdev_gendev, &ap->tdev, + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE); + if (!link) { + ata_port_err(ap, "Failed to create link to scsi device %s\n", + dev_name(&sdev->sdev_gendev)); + return -ENODEV; + } + + return 0; +} +EXPORT_SYMBOL_GPL(ata_scsi_slave_alloc); + /** * ata_scsi_slave_config - Set SCSI device attributes * @sdev: SCSI device to examine @@ -1105,14 +1141,11 @@ int ata_scsi_slave_config(struct scsi_device *sdev) { struct ata_port *ap = ata_shost_to_port(sdev->host); struct ata_device *dev = __ata_scsi_find_dev(ap, sdev); - int rc = 0; - - ata_scsi_sdev_config(sdev); if (dev) - rc = ata_scsi_dev_config(sdev, dev); + return ata_scsi_dev_config(sdev, dev); - return rc; + return 0; } EXPORT_SYMBOL_GPL(ata_scsi_slave_config); @@ -1136,6 +1169,8 @@ void ata_scsi_slave_destroy(struct scsi_device *sdev) unsigned long flags; struct ata_device *dev; + device_link_remove(&sdev->sdev_gendev, &ap->tdev); + spin_lock_irqsave(ap->lock, flags); dev = __ata_scsi_find_dev(ap, sdev); if (dev && dev->sdev) { diff --git a/include/linux/libata.h b/include/linux/libata.h index bf4913f4d7ac..4ece1b7a2a5b 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -1148,6 +1148,7 @@ extern int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int geom[]); extern void ata_scsi_unlock_native_capacity(struct scsi_device *sdev); +extern int ata_scsi_slave_alloc(struct scsi_device *sdev); extern int ata_scsi_slave_config(struct scsi_device *sdev); extern void ata_scsi_slave_destroy(struct scsi_device *sdev); extern int ata_scsi_change_queue_depth(struct scsi_device *sdev, @@ -1396,6 +1397,7 @@ extern const struct attribute_group *ata_common_sdev_groups[]; .this_id = ATA_SHT_THIS_ID, \ .emulated = ATA_SHT_EMULATED, \ .proc_name = drv_name, \ + .slave_alloc = ata_scsi_slave_alloc, \ .slave_destroy = ata_scsi_slave_destroy, \ .bios_param = ata_std_bios_param, \ .unlock_native_capacity = ata_scsi_unlock_native_capacity,\