From patchwork Tue Nov 5 03:57:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226921 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F17EC1850 for ; Tue, 5 Nov 2019 04:00:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0328214D8 for ; Tue, 5 Nov 2019 04:00:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="cExlzQod"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="m48xTo6N" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730192AbfKEEAR (ORCPT ); Mon, 4 Nov 2019 23:00:17 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:33998 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEAR (ORCPT ); Mon, 4 Nov 2019 23:00:17 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 5779060D8F; Tue, 5 Nov 2019 04:00:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926416; bh=jx/SmZAawFg/FnEm6roPssceTWagqsaNGcQB2jC2CHU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cExlzQodbfYgnkzcEAHQrVSFfYk6spYc9L7u+hVPBfQqkLjcgeTtDb5z5rbESgg7m 3pEIPa7pH7ny5l5U+JYU3Ojg6RVl+C7sxMR31vKnUl2JgllofPNA+75qhmzd1K2puu 8G3nIvUcvJhZt3snZfHc9ExOlhAu6LDJJT17jous= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 6AB0F60CED; Tue, 5 Nov 2019 04:00:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926415; bh=jx/SmZAawFg/FnEm6roPssceTWagqsaNGcQB2jC2CHU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m48xTo6NRdHoYhfTbQu+a44CTJNUjCnB3HXmGDS5pEbD53hpJi19VCO9vDIYVn1oV xBPUgAhOLUvwMaQRaJe8o4rF02dDReGvn1AV5f91U3Wb/R6SPjoFnDdFdPjSAym/p+ 7Wl3segeARi649bRFYXnAVQbRSXP/kBfyfLlzRqc= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 6AB0F60CED Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Tomas Winkler , Venkat Gopalakrishnan , Subhash Jadavani , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 1/7] scsi: ufs: Add device reset in link recovery path Date: Mon, 4 Nov 2019 19:57:09 -0800 Message-Id: <1572926236-720-2-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In order to recover from hibern8 exit failure, perform a reset in link recovery path before issuing link start-up. Signed-off-by: Can Guo Reviewed-by: Bean Huo --- drivers/scsi/ufs/ufshcd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c28c144..525f8e6 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -3859,6 +3859,9 @@ static int ufshcd_link_recovery(struct ufs_hba *hba) ufshcd_set_eh_in_progress(hba); spin_unlock_irqrestore(hba->host->host_lock, flags); + /* Reset the attached device */ + ufshcd_vops_device_reset(hba); + ret = ufshcd_host_reset_and_restore(hba); spin_lock_irqsave(hba->host->host_lock, flags); From patchwork Tue Nov 5 03:57:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226917 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AAD96112B for ; Tue, 5 Nov 2019 04:00:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7F1CD214D8 for ; Tue, 5 Nov 2019 04:00:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="CnHxtoQB"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="eAu+5ZDW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730370AbfKEEAT (ORCPT ); Mon, 4 Nov 2019 23:00:19 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:34102 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEAS (ORCPT ); Mon, 4 Nov 2019 23:00:18 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id D02E7608FF; Tue, 5 Nov 2019 04:00:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926417; bh=vA5QMfOG8/tSJ0LbkGi4Gjgkhix8FM2eGb2eZp8y9oo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CnHxtoQBsu8RrAp9YoYgJG/Tg+3zfvNXB9f3i+jrhBLN2bCHdOr+xPxN23uhiU8ue bQUtRx4Kagii2sErv7mXusJcLNBkcDHgKx4jd1tjzKDkI03duXr7CTZIYTYqAL3+IY ASz8kh0LrPKnJJaJlaOr0ILCTQvSi0qxbUc+MxrM= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 0D85360D60; Tue, 5 Nov 2019 04:00:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926416; bh=vA5QMfOG8/tSJ0LbkGi4Gjgkhix8FM2eGb2eZp8y9oo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eAu+5ZDW28fHjCjkGbFFuhvjoAVvDCdf1GyrUMTT4fBkwOsu6PGsDiQx4/jsPHLvU 7MdTqHbRoQdxt928qlwaSEHp8Lsxekj17EDA2SaVw41aPLmcZTw6XS220CTzXgap2P JpT1ov0J6Nc5WrRi/j3LCM3LVFVxIZhnIlPj/zsw= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0D85360D60 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Andy Gross , Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , linux-arm-msm@vger.kernel.org (open list:ARM/QUALCOMM SUPPORT), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 2/7] scsi: ufs-qcom: Add reset control support for host controller Date: Mon, 4 Nov 2019 19:57:10 -0800 Message-Id: <1572926236-720-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add reset control for host controller so that host controller can be reset as required in its power up sequence. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufs-qcom.c | 53 +++++++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufs-qcom.h | 3 +++ 2 files changed, 56 insertions(+) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index a5b7148..c69c29a1c 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -246,6 +246,44 @@ static void ufs_qcom_select_unipro_mode(struct ufs_qcom_host *host) mb(); } +/** + * ufs_qcom_host_reset - reset host controller and PHY + */ +static int ufs_qcom_host_reset(struct ufs_hba *hba) +{ + int ret = 0; + struct ufs_qcom_host *host = ufshcd_get_variant(hba); + + if (!host->core_reset) { + dev_warn(hba->dev, "%s: reset control not set\n", __func__); + goto out; + } + + ret = reset_control_assert(host->core_reset); + if (ret) { + dev_err(hba->dev, "%s: core_reset assert failed, err = %d\n", + __func__, ret); + goto out; + } + + /* + * The hardware requirement for delay between assert/deassert + * is at least 3-4 sleep clock (32.7KHz) cycles, which comes to + * ~125us (4/32768). To be on the safe side add 200us delay. + */ + usleep_range(200, 210); + + ret = reset_control_deassert(host->core_reset); + if (ret) + dev_err(hba->dev, "%s: core_reset deassert failed, err = %d\n", + __func__, ret); + + usleep_range(1000, 1100); + +out: + return ret; +} + static int ufs_qcom_power_up_sequence(struct ufs_hba *hba) { struct ufs_qcom_host *host = ufshcd_get_variant(hba); @@ -254,6 +292,12 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba) bool is_rate_B = (UFS_QCOM_LIMIT_HS_RATE == PA_HS_MODE_B) ? true : false; + /* Reset UFS Host Controller and PHY */ + ret = ufs_qcom_host_reset(hba); + if (ret) + dev_warn(hba->dev, "%s: host reset returned %d\n", + __func__, ret); + if (is_rate_B) phy_set_mode(phy, PHY_MODE_UFS_HS_B); @@ -1101,6 +1145,15 @@ static int ufs_qcom_init(struct ufs_hba *hba) host->hba = hba; ufshcd_set_variant(hba, host); + /* Setup the reset control of HCI */ + host->core_reset = devm_reset_control_get(hba->dev, "rst"); + if (IS_ERR(host->core_reset)) { + err = PTR_ERR(host->core_reset); + dev_warn(dev, "Failed to get reset control %d\n", err); + host->core_reset = NULL; + err = 0; + } + /* Fire up the reset controller. Failure here is non-fatal. */ host->rcdev.of_node = dev->of_node; host->rcdev.ops = &ufs_qcom_reset_ops; diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-qcom.h index d401f17..2d95e7c 100644 --- a/drivers/scsi/ufs/ufs-qcom.h +++ b/drivers/scsi/ufs/ufs-qcom.h @@ -6,6 +6,7 @@ #define UFS_QCOM_H_ #include +#include #define MAX_UFS_QCOM_HOSTS 1 #define MAX_U32 (~(u32)0) @@ -233,6 +234,8 @@ struct ufs_qcom_host { u32 dbg_print_en; struct ufs_qcom_testbus testbus; + /* Reset control of HCI */ + struct reset_control *core_reset; struct reset_controller_dev rcdev; struct gpio_desc *device_reset; From patchwork Tue Nov 5 03:57:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226925 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AA1F7112B for ; Tue, 5 Nov 2019 04:00:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8868D214D8 for ; Tue, 5 Nov 2019 04:00:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="F2jsnNgC"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="aiCyrBeN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730416AbfKEEAY (ORCPT ); Mon, 4 Nov 2019 23:00:24 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:34308 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEAY (ORCPT ); Mon, 4 Nov 2019 23:00:24 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id A675260EE2; Tue, 5 Nov 2019 04:00:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926423; bh=9wd/SNKdJgzdMez2m/ydyczwe4kRopp2y+JbvFH5OOM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=F2jsnNgCvW/uXxGSgLqsI4M1m5Nfd8wxZRjzwSIGi8BmIVhKz0dRuG8gPKJo4O2Qo nZBx9fZN3kACPjYF3/kxwnp6U6CAFB3aOaTt8fiVcafFlBoOMawEmKn7sS/RNXvli/ 5g5RbDjsUhRrOqwZCeanSqLq4MwJQIz1kvYGfexg= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id A80CA60E1C; Tue, 5 Nov 2019 04:00:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926422; bh=9wd/SNKdJgzdMez2m/ydyczwe4kRopp2y+JbvFH5OOM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aiCyrBeNG3rr5E/WgOeG87+BLV2jpDaF8YL/k0uZ5AfgFIglWc+g7FslB0prOhQUL PBmHwHbxTkIfiHAFEkhtzp379/8PbULbiQ9Z9XciJcahShVRF8dg7xym8G0b3jw5Aw Y1ZGODbwSwU1UyFzu6JWRsyINuoPckFYATd3xT10= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A80CA60E1C Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , Tomas Winkler , Stanley Chu , Bean Huo , Venkat Gopalakrishnan , Subhash Jadavani , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 3/7] scsi: ufs: Fix up auto hibern8 enablement Date: Mon, 4 Nov 2019 19:57:11 -0800 Message-Id: <1572926236-720-4-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Fix up possible unclocked register access to auto hibern8 register in resume path and through sysfs entry. Meanwhile, enable auto hibern8 only after device is fully initialized in probe path. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufs-sysfs.c | 17 +++++++++++------ drivers/scsi/ufs/ufshcd.c | 12 ++++++------ 2 files changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c index 969a36b..6c2f19e 100644 --- a/drivers/scsi/ufs/ufs-sysfs.c +++ b/drivers/scsi/ufs/ufs-sysfs.c @@ -126,13 +126,18 @@ static void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit) return; spin_lock_irqsave(hba->host->host_lock, flags); - if (hba->ahit == ahit) - goto out_unlock; - hba->ahit = ahit; - if (!pm_runtime_suspended(hba->dev)) - ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER); -out_unlock: + if (hba->ahit != ahit) + hba->ahit = ahit; spin_unlock_irqrestore(hba->host->host_lock, flags); + if (!pm_runtime_suspended(hba->dev)) { + pm_runtime_get_sync(hba->dev); + ufshcd_hold(hba, false); + spin_lock_irqsave(hba->host->host_lock, flags); + ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER); + spin_unlock_irqrestore(hba->host->host_lock, flags); + ufshcd_release(hba); + pm_runtime_put(hba->dev); + } } /* Convert Auto-Hibernate Idle Timer register value to microseconds */ diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 525f8e6..f12f5a7 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6892,9 +6892,6 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) /* UniPro link is active now */ ufshcd_set_link_active(hba); - /* Enable Auto-Hibernate if configured */ - ufshcd_auto_hibern8_enable(hba); - ret = ufshcd_verify_dev_init(hba); if (ret) goto out; @@ -6945,6 +6942,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) /* set the state as operational after switching to desired gear */ hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + /* Enable Auto-Hibernate if configured */ + ufshcd_auto_hibern8_enable(hba); + /* * If we are in error handling context or in power management callbacks * context, no need to scan the host @@ -7962,12 +7962,12 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (hba->clk_scaling.is_allowed) ufshcd_resume_clkscaling(hba); - /* Schedule clock gating in case of no access to UFS device yet */ - ufshcd_release(hba); - /* Enable Auto-Hibernate if configured */ ufshcd_auto_hibern8_enable(hba); + /* Schedule clock gating in case of no access to UFS device yet */ + ufshcd_release(hba); + goto out; set_old_link_state: From patchwork Tue Nov 5 03:57:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226923 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D22061390 for ; Tue, 5 Nov 2019 04:00:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0B6C214D8 for ; Tue, 5 Nov 2019 04:00:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="EUhbMqdm"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="LKtm3vCY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730454AbfKEEA2 (ORCPT ); Mon, 4 Nov 2019 23:00:28 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:34482 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEA1 (ORCPT ); Mon, 4 Nov 2019 23:00:27 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id D1EC560EE6; Tue, 5 Nov 2019 04:00:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926426; bh=KXlcTtuXcJB8YvdOR6kq1K60cVzJa2GqQG8wQRd1wPg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EUhbMqdm3Ktj6u7mDbHb4cvfJ1E6poHyeBLy5FCyvEyEWJvSSepi/ZvcIqmoYId4z mY1Yxh3E2g4gKSkF/y82w8zmG8LGhHA3RP7E16WU/pYjAiLfVpMDT2LMBYedg5uo5/ IP8gdgAgWqs+XylMvUSRJvgsA6tUrPYIZAp72DAE= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 3015560EE3; Tue, 5 Nov 2019 04:00:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926425; bh=KXlcTtuXcJB8YvdOR6kq1K60cVzJa2GqQG8wQRd1wPg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LKtm3vCYEoM/SeXnKppSKWSbtrt+FxzEgvMwWuKt5ccVxyuIkQ1sgBm3ksGWmu2AZ msrfHPx0Rwld41mFt04HyMwbohZapeIfyLNpkP5TvfCiDGuWCSupv6sOCcyGo+JPvz 5nRcBm8MHsuHgCKxdI+xrGUvecwofwqhChVrAM/g= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 3015560EE3 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Tomas Winkler , Venkat Gopalakrishnan , Subhash Jadavani , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 4/7] scsi: ufs: Fix register dump caused sleep in atomic context Date: Mon, 4 Nov 2019 19:57:12 -0800 Message-Id: <1572926236-720-5-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org ufshcd_print_host_regs() can be called by interrupt handler, but it may sleep due to ufshcd_dump_regs() allocates the dump buffer memory with flag GFP_KERNEL. Fix it by changing GFP_KERNEL to GFP_ATMOIC. Signed-off-by: Can Guo Reviewed-by: Bean Huo --- drivers/scsi/ufs/ufshcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index f12f5a7..671ea2a 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -117,7 +117,7 @@ int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len, if (offset % 4 != 0 || len % 4 != 0) /* keep readl happy */ return -EINVAL; - regs = kzalloc(len, GFP_KERNEL); + regs = kzalloc(len, GFP_ATOMIC); if (!regs) return -ENOMEM; From patchwork Tue Nov 5 03:57:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226929 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 39C901850 for ; Tue, 5 Nov 2019 04:00:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB58521928 for ; Tue, 5 Nov 2019 04:00:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="KpYrHbny"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="KmoGE0Cn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730490AbfKEEAc (ORCPT ); Mon, 4 Nov 2019 23:00:32 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:34620 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEAb (ORCPT ); Mon, 4 Nov 2019 23:00:31 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id ECBA760F90; Tue, 5 Nov 2019 04:00:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926430; bh=VoWrmSDPUW+D5Tgc1LC/Dz8QDzcsLA0EF3+N7bozeJM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KpYrHbnypQ7kx9nRdjcl8K5GmcHcKKSCTBnkQ5mM3aZN1o0rLWDSY3VXuDtq5FN36 vNvH8NyL7+eIEj2gkJ8bdo6y9y629JIuyf8vF/tH6qmeZl8bJ0oJsSkgVEjylbvitR 2P9IOxCQ+fRe80p44ginfvZIC4ZLT2Y5o63b6YYE= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id AE1D160F6F; Tue, 5 Nov 2019 04:00:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926429; bh=VoWrmSDPUW+D5Tgc1LC/Dz8QDzcsLA0EF3+N7bozeJM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KmoGE0Cn8dr+xoFvGSwDrWFDWoAAidm+n0u3bypm38HOZHPuuKYUTxWgAHefhda/t XMZebr/XAT2IIAigh6KqtlBI4OcTiEiyjSIvmTeBKaViklcHJDIwU94UHnZQ5LNs3e KQXQMFPZiOzCK+NPNEdKldUchCeloaNOFPWSyfFk= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org AE1D160F6F Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Venkat Gopalakrishnan , Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Tomas Winkler , Subhash Jadavani , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 5/7] scsi: ufs: Fix irq return code Date: Mon, 4 Nov 2019 19:57:13 -0800 Message-Id: <1572926236-720-6-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Venkat Gopalakrishnan Return IRQ_HANDLED only if the irq is really handled, this will help in catching spurious interrupts that go unhandled. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 134 ++++++++++++++++++++++++++++++++++------------ 1 file changed, 99 insertions(+), 35 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 671ea2a..8d1b04f 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -240,7 +240,7 @@ struct ufs_pm_lvl_states ufs_pm_lvl_states[] = { END_FIX }; -static void ufshcd_tmc_handler(struct ufs_hba *hba); +static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba); static void ufshcd_async_scan(void *data, async_cookie_t cookie); static int ufshcd_reset_and_restore(struct ufs_hba *hba); static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd); @@ -4799,19 +4799,29 @@ static void ufshcd_slave_destroy(struct scsi_device *sdev) * ufshcd_uic_cmd_compl - handle completion of uic command * @hba: per adapter instance * @intr_status: interrupt status generated by the controller + * + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ -static void ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status) +static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status) { + irqreturn_t retval = IRQ_NONE; + if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) { hba->active_uic_cmd->argument2 |= ufshcd_get_uic_cmd_result(hba); hba->active_uic_cmd->argument3 = ufshcd_get_dme_attr_val(hba); complete(&hba->active_uic_cmd->done); + retval = IRQ_HANDLED; } - if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done) + if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done) { complete(hba->uic_async_done); + retval = IRQ_HANDLED; + } + return retval; } /** @@ -4867,8 +4877,12 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba, /** * ufshcd_transfer_req_compl - handle SCSI and query command completion * @hba: per adapter instance + * + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ -static void ufshcd_transfer_req_compl(struct ufs_hba *hba) +static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba) { unsigned long completed_reqs; u32 tr_doorbell; @@ -4887,7 +4901,12 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba) tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL); completed_reqs = tr_doorbell ^ hba->outstanding_reqs; - __ufshcd_transfer_req_compl(hba, completed_reqs); + if (completed_reqs) { + __ufshcd_transfer_req_compl(hba, completed_reqs); + return IRQ_HANDLED; + } else { + return IRQ_NONE; + } } /** @@ -5406,61 +5425,77 @@ static void ufshcd_err_handler(struct work_struct *work) /** * ufshcd_update_uic_error - check and set fatal UIC error flags. * @hba: per-adapter instance + * + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ -static void ufshcd_update_uic_error(struct ufs_hba *hba) +static irqreturn_t ufshcd_update_uic_error(struct ufs_hba *hba) { u32 reg; + irqreturn_t retval = IRQ_NONE; /* PHY layer lane error */ reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER); /* Ignore LINERESET indication, as this is not an error */ if ((reg & UIC_PHY_ADAPTER_LAYER_ERROR) && - (reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)) { + (reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)) { /* * To know whether this error is fatal or not, DB timeout * must be checked but this error is handled separately. */ dev_dbg(hba->dev, "%s: UIC Lane error reported\n", __func__); ufshcd_update_reg_hist(&hba->ufs_stats.pa_err, reg); + retval |= IRQ_HANDLED; } /* PA_INIT_ERROR is fatal and needs UIC reset */ reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER); - if (reg) + if ((reg & UIC_DATA_LINK_LAYER_ERROR) && + (reg & UIC_DATA_LINK_LAYER_ERROR_CODE_MASK)) { ufshcd_update_reg_hist(&hba->ufs_stats.dl_err, reg); - if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT) - hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR; - else if (hba->dev_quirks & - UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) { - if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED) - hba->uic_error |= - UFSHCD_UIC_DL_NAC_RECEIVED_ERROR; - else if (reg & UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT) - hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR; + if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT) + hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR; + else if (hba->dev_quirks & + UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) { + if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED) + hba->uic_error |= + UFSHCD_UIC_DL_NAC_RECEIVED_ERROR; + else if (reg & UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT) + hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR; + } + retval |= IRQ_HANDLED; } /* UIC NL/TL/DME errors needs software retry */ reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER); - if (reg) { + if ((reg & UIC_NETWORK_LAYER_ERROR) && + (reg & UIC_NETWORK_LAYER_ERROR_CODE_MASK)) { ufshcd_update_reg_hist(&hba->ufs_stats.nl_err, reg); hba->uic_error |= UFSHCD_UIC_NL_ERROR; + retval |= IRQ_HANDLED; } reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER); - if (reg) { + if ((reg & UIC_TRANSPORT_LAYER_ERROR) && + (reg & UIC_TRANSPORT_LAYER_ERROR_CODE_MASK)) { ufshcd_update_reg_hist(&hba->ufs_stats.tl_err, reg); hba->uic_error |= UFSHCD_UIC_TL_ERROR; + retval |= IRQ_HANDLED; } reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME); - if (reg) { + if ((reg & UIC_DME_ERROR) && + (reg & UIC_DME_ERROR_CODE_MASK)) { ufshcd_update_reg_hist(&hba->ufs_stats.dme_err, reg); hba->uic_error |= UFSHCD_UIC_DME_ERROR; + retval |= IRQ_HANDLED; } dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n", __func__, hba->uic_error); + return retval; } static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba, @@ -5483,10 +5518,15 @@ static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba, /** * ufshcd_check_errors - Check for errors that need s/w attention * @hba: per-adapter instance + * + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ -static void ufshcd_check_errors(struct ufs_hba *hba) +static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba) { bool queue_eh_work = false; + irqreturn_t retval = IRQ_NONE; if (hba->errors & INT_FATAL_ERRORS) { ufshcd_update_reg_hist(&hba->ufs_stats.fatal_err, hba->errors); @@ -5495,7 +5535,7 @@ static void ufshcd_check_errors(struct ufs_hba *hba) if (hba->errors & UIC_ERROR) { hba->uic_error = 0; - ufshcd_update_uic_error(hba); + retval = ufshcd_update_uic_error(hba); if (hba->uic_error) queue_eh_work = true; } @@ -5543,6 +5583,7 @@ static void ufshcd_check_errors(struct ufs_hba *hba) } schedule_work(&hba->eh_work); } + retval |= IRQ_HANDLED; } /* * if (!queue_eh_work) - @@ -5550,44 +5591,62 @@ static void ufshcd_check_errors(struct ufs_hba *hba) * itself without s/w intervention or errors that will be * handled by the SCSI core layer. */ + return retval; } /** * ufshcd_tmc_handler - handle task management function completion * @hba: per adapter instance + * + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ -static void ufshcd_tmc_handler(struct ufs_hba *hba) +static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba) { u32 tm_doorbell; tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL); hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks; - wake_up(&hba->tm_wq); + if (hba->tm_condition) { + wake_up(&hba->tm_wq); + return IRQ_HANDLED; + } else { + return IRQ_NONE; + } } /** * ufshcd_sl_intr - Interrupt service routine * @hba: per adapter instance * @intr_status: contains interrupts generated by the controller + * + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ -static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status) +static irqreturn_t ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status) { + irqreturn_t retval = IRQ_NONE; + hba->errors = UFSHCD_ERROR_MASK & intr_status; if (ufshcd_is_auto_hibern8_error(hba, intr_status)) hba->errors |= (UFSHCD_UIC_HIBERN8_MASK & intr_status); if (hba->errors) - ufshcd_check_errors(hba); + retval |= ufshcd_check_errors(hba); if (intr_status & UFSHCD_UIC_MASK) - ufshcd_uic_cmd_compl(hba, intr_status); + retval |= ufshcd_uic_cmd_compl(hba, intr_status); if (intr_status & UTP_TASK_REQ_COMPL) - ufshcd_tmc_handler(hba); + retval |= ufshcd_tmc_handler(hba); if (intr_status & UTP_TRANSFER_REQ_COMPL) - ufshcd_transfer_req_compl(hba); + retval |= ufshcd_transfer_req_compl(hba); + + return retval; } /** @@ -5595,8 +5654,9 @@ static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status) * @irq: irq number * @__hba: pointer to adapter instance * - * Returns IRQ_HANDLED - If interrupt is valid - * IRQ_NONE - If invalid interrupt + * Returns + * IRQ_HANDLED - If interrupt is valid + * IRQ_NONE - If invalid interrupt */ static irqreturn_t ufshcd_intr(int irq, void *__hba) { @@ -5619,14 +5679,18 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE); if (intr_status) ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS); - if (enabled_intr_status) { - ufshcd_sl_intr(hba, enabled_intr_status); - retval = IRQ_HANDLED; - } + if (enabled_intr_status) + retval |= ufshcd_sl_intr(hba, enabled_intr_status); intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); } while (intr_status && --retries); + if (retval == IRQ_NONE) { + dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x\n", + __func__, intr_status); + ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: "); + } + spin_unlock(hba->host->host_lock); return retval; } From patchwork Tue Nov 5 03:57:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226927 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8218E1390 for ; Tue, 5 Nov 2019 04:00:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FF2821928 for ; Tue, 5 Nov 2019 04:00:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="S6QSdTl3"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="SaIuIh20" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730513AbfKEEAf (ORCPT ); Mon, 4 Nov 2019 23:00:35 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:34814 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEAe (ORCPT ); Mon, 4 Nov 2019 23:00:34 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id EAE7F60D5C; Tue, 5 Nov 2019 04:00:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926433; bh=A09Hg8Gubfo22q2oteGE+XWVmGvlbeGYL8Kj6AbIyz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S6QSdTl3teYRhZJCTEQCmpfSVYiAku4tQDJkzQ6FPW7InNeaCTN03OCVm/L399z6S 3DiB6WCDXP0M0mLwMWZTaCb5lhRbMQ08sKzA9GZ4L6SyM9mLHtYomhdFAQN3ZNtNKS qfRPd2BUXKdTGjc+mRSpLgQtrlda+Q1Y7tMv3ofA= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 35AC060F6F; Tue, 5 Nov 2019 04:00:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926432; bh=A09Hg8Gubfo22q2oteGE+XWVmGvlbeGYL8Kj6AbIyz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SaIuIh20eitXsdg6OHgSyNkmNdtqVIH2JqziAxmEWCqMX+rgZu1gsKlSw8wvppKHS U8IzYVE+T6afRWrljtUEQIWFPtl/1obcazsfiy03x+dTlELL79Uu82gKr+qiRDBVLq +QQx611YN0DIQy+UYi7z9eMRMtwUFo1Hk7RzhWcM= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 35AC060F6F Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Tomas Winkler , Venkat Gopalakrishnan , Subhash Jadavani , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 6/7] scsi: ufs: Abort gating if clock on request is pending Date: Mon, 4 Nov 2019 19:57:14 -0800 Message-Id: <1572926236-720-7-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Asutosh Das This change attempts to abort gating of clocks if a request to turn-on clocks is pending. This would in turn avoid turning OFF and back ON the clocks. Signed-off-by: Asutosh Das Signed-off-by: Can Guo Reviewed-by: Bean Huo --- drivers/scsi/ufs/ufshcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 8d1b04f..7a5a904 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1610,7 +1610,7 @@ static void ufshcd_gate_work(struct work_struct *work) * state to CLKS_ON. */ if (hba->clk_gating.is_suspended || - (hba->clk_gating.state == REQ_CLKS_ON)) { + (hba->clk_gating.state != REQ_CLKS_OFF)) { hba->clk_gating.state = CLKS_ON; trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state); From patchwork Tue Nov 5 03:57:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11226931 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6E297112B for ; Tue, 5 Nov 2019 04:00:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4B5BB214D8 for ; Tue, 5 Nov 2019 04:00:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="hburbf1Q"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="nSpi0ROv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730533AbfKEEAj (ORCPT ); Mon, 4 Nov 2019 23:00:39 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:35040 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730017AbfKEEAj (ORCPT ); Mon, 4 Nov 2019 23:00:39 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 19EED61015; Tue, 5 Nov 2019 04:00:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926438; bh=CfQKWzPAIBBRWL1m6nlO3ABW3eoRsUcJysSGhIsU7XU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hburbf1QsD1tAm9SyqTqJGCDvPxdEYcL8UOBiGc+dqtcLMSrd5cOrPWJ+gCRrBs1j mjPc3pyJzADI9vYgrbM7ptIZh7/kmMxDkS9+98u6wqF4SSx6A0ZYwV93NUJ8NLrpDU tpSMZedTBFsAF7gEML8WV7lppQjsDKVF5vhqOWTY= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id A9EE860D61; Tue, 5 Nov 2019 04:00:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1572926436; bh=CfQKWzPAIBBRWL1m6nlO3ABW3eoRsUcJysSGhIsU7XU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nSpi0ROvFBgEkZZoZrhC2OLoVVD3EnS17vtbYh224EsL0x2XuWvT9dY8Hstv8tSNf 25wyT7WsoTzVouCWARkn2qj8gkNK3P9YGDAsPI73FA0hNhXhFBwX5NhRRNnIqeqp0t Qo8Xhxf0OmiVci6pjU67RLVxUic1h342eoqzTPxA= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A9EE860D61 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Subhash Jadavani , Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Tomas Winkler , Venkat Gopalakrishnan , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 7/7] scsi: ufs: Fix error handing during hibern8 enter Date: Mon, 4 Nov 2019 19:57:15 -0800 Message-Id: <1572926236-720-8-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1572926236-720-1-git-send-email-cang@codeaurora.org> References: <1572926236-720-1-git-send-email-cang@codeaurora.org> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Subhash Jadavani During clock gating (ufshcd_gate_work()), we first put the link hibern8 by calling ufshcd_uic_hibern8_enter() and if ufshcd_uic_hibern8_enter() returns success (0) then we gate all the clocks. Now let’s zoom in to what ufshcd_uic_hibern8_enter() does internally: It calls __ufshcd_uic_hibern8_enter() which on detecting the LINERESET, initiates the full recovery and puts the link back to highest HS gear and returns success (0) to ufshcd_uic_hibern8_enter() which is the issue as link is still in active state due to recovery! Now ufshcd_uic_hibern8_enter() returns success to ufshcd_gate_work() and hence it goes ahead with gating the UFS clock while link is still in active state hence I believe controller would raise UIC error interrupts. But when we service the interrupt, clocks might have already been disabled! This change fixes for this by returning failure from __ufshcd_uic_hibern8_enter() if recovery succeeds as link is still not in hibern8, upon receiving the error ufshcd_hibern8_enter() would initiate retry to put the link state back into hibern8. Signed-off-by: Subhash Jadavani Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 7a5a904..934c27a 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -3891,15 +3891,24 @@ static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba) ktime_to_us(ktime_sub(ktime_get(), start)), ret); if (ret) { + int err; + dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n", __func__, ret); /* - * If link recovery fails then return error so that caller - * don't retry the hibern8 enter again. + * If link recovery fails then return error code (-ENOLINK) + * returned ufshcd_link_recovery(). + * If link recovery succeeds then return -EAGAIN to attempt + * hibern8 enter retry again. */ - if (ufshcd_link_recovery(hba)) - ret = -ENOLINK; + err = ufshcd_link_recovery(hba); + if (err) { + dev_err(hba->dev, "%s: link recovery failed", __func__); + ret = err; + } else { + ret = -EAGAIN; + } } else ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER, POST_CHANGE); @@ -3913,7 +3922,7 @@ static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba) for (retries = UIC_HIBERN8_ENTER_RETRIES; retries > 0; retries--) { ret = __ufshcd_uic_hibern8_enter(hba); - if (!ret || ret == -ENOLINK) + if (!ret) goto out; } out: