From patchwork Wed Feb 24 20:23:03 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: 12102765 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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 17349C433DB for ; Wed, 24 Feb 2021 20:25:21 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AC84B60202 for ; Wed, 24 Feb 2021 20:25:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AC84B60202 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-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Owner; bh=nigxXmety3Evs6/G3b1YwsYSGNqjdc60ISnfkHAX6sI=; b=YJK/G6XNy1+L8bBTAloPonCj5b 2iv3lcnaNTeTgeGuF5vhSLdI0I8xtxzPmHD9GxuDDyHTL5TuISx2XfackFSqAOz2mSYZcebFw4esQ H6n7E9zd4jf6CguUQA9SCnWOpdqeEAU3SreWzQbdsXnaZmxoxtgD26UlcEFYML5MWqTMN1tHPW9W1 +ddaD+ZBvapf7m+PKwR9u2G0Oi10jlaGYmvkpufSochwh1vfc58jz37L5QpCDLjey6Q0whxkI1B21 u6e6h2zZ7u8/yGchNJTqiMsfOLWOoDPTTDL0xtjL24V08pXbdeHTavUTixGEvOv6sbvqv+5Fr8ITA Jo6HmixA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lF0hO-0004f3-AZ; Wed, 24 Feb 2021 20:23:54 +0000 Received: from labrats.qualcomm.com ([199.106.110.90]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1lF0hM-0004ea-Cu; Wed, 24 Feb 2021 20:23:53 +0000 IronPort-SDR: q36YWLywSEHxuLviwTlxswEXtwA9rIa6FytR93dBDK0jWFBwkTOEnLJjcYNfoKxTk1T/sW4oLs J1Wke3uvzWHc0crFjzoVAOpVPKexyiKHcgVGKj8xEtZINVpLY4FPLzFUoud3lJ9RBaLXDDapl9 5/YQLRfmRvilN2zNmWoFvlpKqmoDvo5CKD6p4Bd730jkDHHDEaBtmWkOI7tH8o9kgYDYfKdKob s1NCgmIZQtOGhCTLzgbw5o09AQxEfD5xq67NPqOJdFAqRQ9C2TriwDBE1rH09OQWeKvGSwIAGd b68= X-IronPort-AV: E=Sophos;i="5.81,203,1610438400"; d="scan'208";a="47789411" Received: from unknown (HELO ironmsg-SD-alpha.qualcomm.com) ([10.53.140.30]) by labrats.qualcomm.com with ESMTP; 24 Feb 2021 12:23:50 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg-SD-alpha.qualcomm.com with ESMTP; 24 Feb 2021 12:23:49 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 92687) id 38D3C219CE; Wed, 24 Feb 2021 12:23:49 -0800 (PST) From: Asutosh Das To: cang@codeaurora.org, martin.petersen@oracle.com, adrian.hunter@intel.com, linux-scsi@vger.kernel.org Subject: [PATCH v6 0/2] Enable power management for ufs wlun Date: Wed, 24 Feb 2021 12:23:03 -0800 Message-Id: X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210224_152352_586851_9200748A X-CRM114-Status: GOOD ( 13.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthias Brugger , linux-arm-msm@vger.kernel.org, "moderated list:ARM/Mediatek SoC support" , "moderated list:ARM/Mediatek SoC support" , Asutosh Das MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 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 | 530 ++++++++++++++++++++++++++++++------- drivers/scsi/ufs/ufshcd.h | 7 + include/trace/events/ufs.h | 20 ++ 11 files changed, 489 insertions(+), 132 deletions(-)