From patchwork Thu Feb 25 23:37:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Asutosh Das \(asd\)" X-Patchwork-Id: 387500 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 7759AC433E6 for ; Thu, 25 Feb 2021 23:38:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2455364F28 for ; Thu, 25 Feb 2021 23:38:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232077AbhBYXiT (ORCPT ); Thu, 25 Feb 2021 18:38:19 -0500 Received: from labrats.qualcomm.com ([199.106.110.90]:39803 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231591AbhBYXiT (ORCPT ); Thu, 25 Feb 2021 18:38:19 -0500 IronPort-SDR: 8ZKnWHuV6wdP9AY/ZuI0iI39Qz52MGEQXTGWf6cKvsbeMzYyR/GkwpNy4AE4B+FhHLvigkE8P4 Y8TG/fq3tWLPGwaHbdNPx0A6sEVC9SQvkopV2PSw2lh2kDqzHPqZcGl88au3UX/7qnQ4N02kUQ dRrnW+CRWlsXNIvGCgk65DNSO8kTUk2jrjhQQa6Xd1tsk7I+oFAtWmG9X1NvhxJMiTaqeLsCSo cvtafwzPQPHhOGJADThOxRfRil0/PS23icqSDYxrCJh7lp1Bs9ilGwqo+bqAPPJ6xImnJu2aCj K7o= X-IronPort-AV: E=Sophos;i="5.81,207,1610438400"; d="scan'208";a="47791155" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 25 Feb 2021 15:37:39 -0800 X-QCInternal: smtphost Received: from wsp769891wss.qualcomm.com (HELO stor-presley.qualcomm.com) ([192.168.140.85]) by ironmsg01-sd.qualcomm.com with ESMTP; 25 Feb 2021 15:37:38 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 92687) id 5ABE121A25; Thu, 25 Feb 2021 15:37:38 -0800 (PST) From: Asutosh Das To: cang@codeaurora.org, martin.petersen@oracle.com, adrian.hunter@intel.com, linux-scsi@vger.kernel.org Cc: Asutosh Das , linux-arm-msm@vger.kernel.org, Matthias Brugger , linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support), linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [PATCH v8 0/2] Enable power management for ufs wlun Date: Thu, 25 Feb 2021 15:37:32 -0800 Message-ID: X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Message-ID: <20210225233732.L7dxZb1tTnnU_vso1WwxElpezBNuxko1zyhN5i7FA3A@z> This patch attempts to fix a deadlock in ufs while sending SSU. Recently, blk_queue_enter() added a check to not process requests if the queue is suspended. That leads to a resume of the associated device which is suspended. In ufs, that device is ufs device wlun and it's parent is ufs_hba. This resume tries to resume ufs device wlun which in turn tries to resume ufs_hba, which is already in the process of suspending, thus causing a deadlock. This patch takes care of: * Suspending the ufs device lun only after all other luns are suspended * Sending SSU during ufs device wlun suspend * Clearing uac for rpmb and ufs device wlun * Not sending commands to the device during host suspend v7 -> v8: - Addressed Adrian's comments * Removed separate autosuspend delay for ufs-device lun * Fixed the ee handler getting scheduled during pm * Always runtime resume in suspend_prepare() * Added CONFIG_PM_SLEEP where needed v6 -> v7: * Resume the ufs device before shutting it down v5 -> v6: - Addressed Adrian's comments * Added complete() cb * Added suspend_prepare() and complete() to all drivers * Moved suspend_prepare() and complete() to ufshcd * .poweroff() uses ufhcd_wl_poweroff() * Removed several forward declarations * Moved scsi_register_driver() to ufshcd_core_init() v4 -> v5: - Addressed Adrian's comments * Used the rpmb driver contributed by Adrian * Runtime-resume the ufs device during suspend to honor spm-lvl * Unregister the scsi_driver in ufshcd_remove() * Currently shutdown() puts the ufs device to power-down mode so, just removed ufshcd_pci_poweroff() * Quiesce the scsi device during shutdown instead of remove v3 RFC -> v4: - Addressed Bart's comments * Except that I didn't get any checkpatch failures - Addressed Avri's comments - Addressed Adrian's comments * Added a check for deepsleep power mode * Removed a couple of forward declarations * Didn't separate the scsi drivers because in rpmb case it just sends uac in resume and it seemed pretty neat to me. - Added sysfs changes to resume the devices before accessing Asutosh Das (2): scsi: ufs: Enable power management for wlun ufs: sysfs: Resume the proper scsi device drivers/scsi/ufs/cdns-pltfrm.c | 2 + drivers/scsi/ufs/tc-dwc-g210-pci.c | 2 + drivers/scsi/ufs/ufs-exynos.c | 2 + drivers/scsi/ufs/ufs-hisi.c | 2 + drivers/scsi/ufs/ufs-mediatek.c | 2 + drivers/scsi/ufs/ufs-qcom.c | 2 + drivers/scsi/ufs/ufs-sysfs.c | 26 +- drivers/scsi/ufs/ufshcd-pci.c | 26 +- drivers/scsi/ufs/ufshcd.c | 540 ++++++++++++++++++++++++++++++------- drivers/scsi/ufs/ufshcd.h | 7 + include/trace/events/ufs.h | 20 ++ 11 files changed, 498 insertions(+), 133 deletions(-)