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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 7ED2EC2BA83 for ; Fri, 14 Feb 2020 18:09:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 559B32187F for ; Fri, 14 Feb 2020 18:09:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581703753; bh=ojdZBesU1mQCoDyStO8lDvN5/e3I9pTuYTAR3mRxsow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=15SxNA6NyLBXT+HmAlR5/h2uNIi77ph9UJ/+B9ag0GLwO9m36+b+YFI4BXsmd00Wp tc4OFX2bScRI3o2Xwgw6lEZMkqiwcIYAnwQn9v4N7Sk6/JTkZC6uah0ULPspTiVEF9 930jN2aGnm4RGAoJt3kcWEyblbRvm4tMS3a6MAk8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392822AbgBNSJL (ORCPT ); Fri, 14 Feb 2020 13:09:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:33808 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731412AbgBNPyG (ORCPT ); Fri, 14 Feb 2020 10:54:06 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 977F92465D; Fri, 14 Feb 2020 15:54:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581695645; bh=ojdZBesU1mQCoDyStO8lDvN5/e3I9pTuYTAR3mRxsow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Pjh6kO6BKofYqdQiFHxWOo/IgJqTkquR7A2KS9llwQyW/SWjAb96uqBOm+olrH9nr XpBr6BSL6xCxN8xu3HHQBEhCdhwrKrgHUQBMpgAEjDyvIfJnXDkbnzg141/410dHEs hNVT7sxvXzsnA/KMTbbSb4EHXCWV5V46W6b13RVg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Can Guo , Alim Akhtar , Bean Huo , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.5 239/542] scsi: ufs: Complete pending requests in host reset and restore path Date: Fri, 14 Feb 2020 10:43:51 -0500 Message-Id: <20200214154854.6746-239-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214154854.6746-1-sashal@kernel.org> References: <20200214154854.6746-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Can Guo [ Upstream commit 2df74b6985b51e77756e2e8faa16c45ca3ba53c5 ] In UFS host reset and restore path, before probe, we stop and start the host controller once. After host controller is stopped, the pending requests, if any, are cleared from the doorbell, but no completion IRQ would be raised due to the hba is stopped. These pending requests shall be completed along with the first NOP_OUT command (as it is the first command which can raise a transfer completion IRQ) sent during probe. Since the OCSs of these pending requests are not SUCCESS (because they are not yet literally finished), their UPIUs shall be dumped. When there are multiple pending requests, the UPIU dump can be overwhelming and may lead to stability issues because it is in atomic context. Therefore, before probe, complete these pending requests right after host controller is stopped and silence the UPIU dump from them. Link: https://lore.kernel.org/r/1574751214-8321-5-git-send-email-cang@qti.qualcomm.com Reviewed-by: Alim Akhtar Reviewed-by: Bean Huo Tested-by: Bean Huo Signed-off-by: Can Guo Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/ufs/ufshcd.c | 24 ++++++++++-------------- drivers/scsi/ufs/ufshcd.h | 2 ++ 2 files changed, 12 insertions(+), 14 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 3fbf9ea16c64e..7d8300c9a0148 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4799,7 +4799,7 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) break; } /* end of switch */ - if (host_byte(result) != DID_OK) + if ((host_byte(result) != DID_OK) && !hba->silence_err_logs) ufshcd_print_trs(hba, 1 << lrbp->task_tag, true); return result; } @@ -5351,8 +5351,8 @@ static void ufshcd_err_handler(struct work_struct *work) /* * if host reset is required then skip clearing the pending - * transfers forcefully because they will automatically get - * cleared after link startup. + * transfers forcefully because they will get cleared during + * host reset and restore */ if (needs_reset) goto skip_pending_xfer_clear; @@ -6282,9 +6282,15 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba) int err; unsigned long flags; - /* Reset the host controller */ + /* + * Stop the host controller and complete the requests + * cleared by h/w + */ spin_lock_irqsave(hba->host->host_lock, flags); ufshcd_hba_stop(hba, false); + hba->silence_err_logs = true; + ufshcd_complete_requests(hba); + hba->silence_err_logs = false; spin_unlock_irqrestore(hba->host->host_lock, flags); /* scale up clocks to max frequency before full reinitialization */ @@ -6318,7 +6324,6 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba) static int ufshcd_reset_and_restore(struct ufs_hba *hba) { int err = 0; - unsigned long flags; int retries = MAX_HOST_RESET_RETRIES; do { @@ -6328,15 +6333,6 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba) err = ufshcd_host_reset_and_restore(hba); } while (err && --retries); - /* - * After reset the door-bell might be cleared, complete - * outstanding requests in s/w here. - */ - spin_lock_irqsave(hba->host->host_lock, flags); - ufshcd_transfer_req_compl(hba); - ufshcd_tmc_handler(hba); - spin_unlock_irqrestore(hba->host->host_lock, flags); - return err; } diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 2740f6941ec69..2e59f9d8ab89e 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -513,6 +513,7 @@ struct ufs_stats { * @uic_error: UFS interconnect layer error status * @saved_err: sticky error mask * @saved_uic_err: sticky UIC error mask + * @silence_err_logs: flag to silence error logs * @dev_cmd: ufs device management command information * @last_dme_cmd_tstamp: time stamp of the last completed DME command * @auto_bkops_enabled: to track whether bkops is enabled in device @@ -670,6 +671,7 @@ struct ufs_hba { u32 saved_err; u32 saved_uic_err; struct ufs_stats ufs_stats; + bool silence_err_logs; /* Device management request data */ struct ufs_dev_cmd dev_cmd; -- 2.20.1