From patchwork Wed Jul 24 05:50:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanley Chu X-Patchwork-Id: 11055951 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2A17E1398 for ; Wed, 24 Jul 2019 05:50:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 18B0F1FEBD for ; Wed, 24 Jul 2019 05:50:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0CD0827FB3; Wed, 24 Jul 2019 05:50:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9FF741FEBD for ; Wed, 24 Jul 2019 05:50:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: 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: List-Owner; bh=4rCX3PdMTRlzREYl1e8z++MXreTg8a1GRh2iCOwlDsA=; b=XwrE4HEPvpUma6 Q4FYZDWYL9EMPg+MLiAgIivBgySgYD1kWuVLfgV5fU2ITQP6OOdZjmE2xXlhgMR57ZDJYXKk+A4u+ nLz+e537TvxMIOGjMut6qHRjukKInocDB2SPzUnd182gPChALGZQ229y7hciJ6HdQKHjqB//As6CS u4I0KwlGFnJ9O+/tDfVaBwvA4b8fM/OUguCQsxRX4vZKOpr9EdgY0aawJtRe1h+KR8AWUVZsW6I2M +9DYhr0wQnBKU7VI3BK3L0jWhVPdtBmz7vtrNm6dwfZ+omkssAHCrQe+S7zwWhILuvEbGQDbpy+lt D0W2DUo6J++VRdOqHB3Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hqAAl-0006KP-89; Wed, 24 Jul 2019 05:50:43 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hqAAZ-0006Gv-7o; Wed, 24 Jul 2019 05:50:32 +0000 X-UUID: 6ac57a6b11fa4d4d8f0c19ac1470ba0a-20190723 X-UUID: 6ac57a6b11fa4d4d8f0c19ac1470ba0a-20190723 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 583997347; Tue, 23 Jul 2019 21:50:30 -0800 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 23 Jul 2019 22:50:28 -0700 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 24 Jul 2019 13:50:27 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 24 Jul 2019 13:50:27 +0800 From: Stanley Chu To: , , , , Subject: [PATCH v2 3/3] scsi: ufs: fix broken hba->outstanding_tasks Date: Wed, 24 Jul 2019 13:50:18 +0800 Message-ID: <1563947418-16394-4-git-send-email-stanley.chu@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1563947418-16394-1-git-send-email-stanley.chu@mediatek.com> References: <1563947418-16394-1-git-send-email-stanley.chu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190723_225031_447622_062C995F X-CRM114-Status: GOOD ( 12.98 ) 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: marc.w.gonzalez@free.fr, andy.teng@mediatek.com, chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com, evgreen@chromium.org, linux-mediatek@lists.infradead.org, peter.wang@mediatek.com, matthias.bgg@gmail.com, Stanley Chu , linux-arm-kernel@lists.infradead.org, beanhuo@micron.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Currently bits in hba->outstanding_tasks are cleared only after their corresponding task management commands are successfully done by __ufshcd_issue_tm_cmd(). If timeout happens in a task management command, its corresponding bit in hba->outstanding_tasks will not be cleared until next task management command with the same tag used successfully finishes. This is wrong and can lead to some issues, like power issue. For example, ufshcd_release() and ufshcd_gate_work() will do nothing if hba->outstanding_tasks is not zero even if both UFS host and devices are actually idle. Referring to error handling flow of hba->outstanding_reqs, all timed-out bits will be cleared by ufshcd_reset_and_restore() => ufshcd_transfer_req_compl() after reset is done. Therefore similar handling for hba->outstanding_tasks could be applied, for example, by ufshcd_reset_and_restore() => ufshcd_tmc_handler(). Signed-off-by: Stanley Chu --- drivers/scsi/ufs/ufshcd.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 114c15ed75f7..3cb942ef64e2 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5535,11 +5535,25 @@ static void ufshcd_tm_cmd_compl(struct ufs_hba *hba, int tag) */ static void ufshcd_tmc_handler(struct ufs_hba *hba) { - u32 tm_doorbell; + u32 tm_doorbell, tag; tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL); hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks; + + /* + * resource of timed-out tasks shall be cleaned. + * No effect for normal tasks. + */ + for_each_set_bit(tag, &hba->tm_condition, hba->nutmrs) + ufshcd_tm_cmd_compl(hba, tag); + wake_up(&hba->tm_wq); + + /* + * If a timed-out task is cleaned done above, + * free tag is available now for waiters. + */ + wake_up(&hba->tm_tag_wq); } /**