From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 D974DC433E6 for ; Thu, 7 Jan 2021 08:03:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 881782312F for ; Thu, 7 Jan 2021 08:03:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726682AbhAGIDd (ORCPT ); Thu, 7 Jan 2021 03:03:33 -0500 Received: from so254-31.mailgun.net ([198.61.254.31]:57513 "EHLO so254-31.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726171AbhAGIDd (ORCPT ); Thu, 7 Jan 2021 03:03:33 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1610006590; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=XlEY8yxgI8delZYCWoEHjc5wuL1+0bXAptPyM1VtN6U=; b=A1RJnHbvSm8rAsZi16k7W8WmrZDl8Ch87ibwnoLN67SuIkzNl2MRNyJ0Ofp4oogiYlk84AcL 7OxxZKTZmISfaEt/4GDLMgiS10e43SIYkJ1YUPzwvXNhPdzoKFBCaCymL39TN4Y/43mjdej6 vY1Qbzf45b4oAUaRNbLSjNwJGZc= X-Mailgun-Sending-Ip: 198.61.254.31 X-Mailgun-Sid: WyJlNmU5NiIsICJsaW51eC1zY3NpQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-west-2.postgun.com with SMTP id 5ff6c023fc3778927e21b7a9 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 07 Jan 2021 08:02:43 GMT Sender: cang=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 95101C43465; Thu, 7 Jan 2021 08:02:43 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: cang) by smtp.codeaurora.org (Postfix) with ESMTPSA id A459DC433CA; Thu, 7 Jan 2021 08:02:42 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 07 Jan 2021 16:02:42 +0800 From: Can Guo To: Jaegeuk Kim Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, kernel-team@android.com, alim.akhtar@samsung.com, avri.altman@wdc.com, bvanassche@acm.org, martin.petersen@oracle.com, stanley.chu@mediatek.com, Jaegeuk Kim Subject: Re: [PATCH v4 2/2] scsi: ufs: handle LINERESET with correct tm_cmd In-Reply-To: <20210107074710.549309-3-jaegeuk@kernel.org> References: <20210107074710.549309-1-jaegeuk@kernel.org> <20210107074710.549309-3-jaegeuk@kernel.org> Message-ID: <03a47a3f49914230653bea777e2ee550@codeaurora.org> X-Sender: cang@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On 2021-01-07 15:47, Jaegeuk Kim wrote: > From: Jaegeuk Kim > > This fixes a warning caused by wrong reserve tag usage in > __ufshcd_issue_tm_cmd. > > WARNING: CPU: 7 PID: 7 at block/blk-core.c:630 > blk_get_request+0x68/0x70 > WARNING: CPU: 4 PID: 157 at block/blk-mq-tag.c:82 > blk_mq_get_tag+0x438/0x46c > > And, in ufshcd_err_handler(), we can avoid to send tm_cmd before > aborting > outstanding commands by waiting a bit for IO completion like this. > > __ufshcd_issue_tm_cmd: task management cmd 0x80 timed-out > > Fixes: 69a6c269c097 ("scsi: ufs: Use blk_{get,put}_request() to > allocate and free TMFs") > Fixes: 2355b66ed20c ("scsi: ufs: Handle LINERESET indication in err > handler") Hi Jaegeuk, Sorry, what is wrong with commit 2355b66ed20c? Clearing pending I/O reqs is a general procedure for handling all non-fatal errors. Thanks, Can Guo. > Signed-off-by: Jaegeuk Kim > --- > drivers/scsi/ufs/ufshcd.c | 35 +++++++++++++++++++++++++++++++---- > 1 file changed, 31 insertions(+), 4 deletions(-) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index e6e7bdf99cd7..340dd5e515dd 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -44,6 +44,9 @@ > /* Query request timeout */ > #define QUERY_REQ_TIMEOUT 1500 /* 1.5 seconds */ > > +/* LINERESET TIME OUT */ > +#define LINERESET_IO_TIMEOUT_MS (30000) /* 30 sec */ > + > /* Task management command timeout */ > #define TM_CMD_TIMEOUT 100 /* msecs */ > > @@ -5826,6 +5829,7 @@ static void ufshcd_err_handler(struct work_struct > *work) > int err = 0, pmc_err; > int tag; > bool needs_reset = false, needs_restore = false; > + ktime_t start; > > hba = container_of(work, struct ufs_hba, eh_work); > > @@ -5911,6 +5915,22 @@ static void ufshcd_err_handler(struct > work_struct *work) > } > > hba->silence_err_logs = true; > + > + /* Wait for IO completion for non-fatal errors to avoid aborting IOs > */ > + start = ktime_get(); > + while (hba->outstanding_reqs) { > + ufshcd_complete_requests(hba); > + spin_unlock_irqrestore(hba->host->host_lock, flags); > + schedule(); > + spin_lock_irqsave(hba->host->host_lock, flags); > + if (ktime_to_ms(ktime_sub(ktime_get(), start)) > > + LINERESET_IO_TIMEOUT_MS) { > + dev_err(hba->dev, "%s: timeout, outstanding=0x%lx\n", > + __func__, hba->outstanding_reqs); > + break; > + } > + } > + > /* release lock as clear command might sleep */ > spin_unlock_irqrestore(hba->host->host_lock, flags); > /* Clear pending transfer requests */ > @@ -6302,9 +6322,13 @@ static irqreturn_t ufshcd_intr(int irq, void > *__hba) > intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); > } > > - if (enabled_intr_status && retval == IRQ_NONE) { > - dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x\n", > - __func__, intr_status); > + if (enabled_intr_status && retval == IRQ_NONE && > + !ufshcd_eh_in_progress(hba)) { > + dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x (0x%08x, > 0x%08x)\n", > + __func__, > + intr_status, > + hba->ufs_stats.last_intr_status, > + enabled_intr_status); > ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: "); > } > > @@ -6348,7 +6372,10 @@ static int __ufshcd_issue_tm_cmd(struct ufs_hba > *hba, > * Even though we use wait_event() which sleeps indefinitely, > * the maximum wait time is bounded by %TM_CMD_TIMEOUT. > */ > - req = blk_get_request(q, REQ_OP_DRV_OUT, BLK_MQ_REQ_RESERVED); > + req = blk_get_request(q, REQ_OP_DRV_OUT, 0); > + if (IS_ERR(req)) > + return PTR_ERR(req); > + > req->end_io_data = &wait; > free_slot = req->tag; > WARN_ON_ONCE(free_slot < 0 || free_slot >= hba->nutmrs);