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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 86343C433B4 for ; Sun, 2 May 2021 14:04:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E8996102A for ; Sun, 2 May 2021 14:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232939AbhEBOFc (ORCPT ); Sun, 2 May 2021 10:05:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:49870 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232483AbhEBOEp (ORCPT ); Sun, 2 May 2021 10:04:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E59C36102A; Sun, 2 May 2021 14:03:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619964234; bh=r1/ahzg25Xqqs+5gdHK1VVqEGSnekka4d6ChlAaYAxQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=elLtLuygwN61cOx0dCF69FsKsIDOJweokJZ0XsIxma6zoa8f45zZ59ffsjjugVjHr v+4jLqS9GhcNNTycLxFDslHQiVg08ZhcjSY4ThtGx2etrHc2wcAVMTUZ+iAN0csVPv xH+WLVoYNksp2Evygn+Dktm2P7btRxQIDSqH7kA7wjjN41yhcdZcJkMLRZ0yl8G+zv SX2/K0unYqdt0XGuwFNyZcIZNvpMrSUmIo5Gzc2Aq4ZMyDWJZ9vnjygK68EaS4JMp5 kpPH71sv8u3Ob+MjYnwPuSTupO99hI+FJ3KKWc7WHWcrnb8sSVEafnq73F8flV0LjD +55sfM1vh/EdQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Bhaumik Bhatt , Loic Poulain , Manivannan Sadhasivam , Sasha Levin , linux-arm-msm@vger.kernel.org Subject: [PATCH AUTOSEL 5.11 06/70] bus: mhi: core: Process execution environment changes serially Date: Sun, 2 May 2021 10:02:40 -0400 Message-Id: <20210502140344.2719040-6-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210502140344.2719040-1-sashal@kernel.org> References: <20210502140344.2719040-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bhaumik Bhatt [ Upstream commit ef2126c4e2ea2b92f543fae00a2a0332e4573c48 ] In current design, whenever the BHI interrupt is fired, the execution environment is updated. This can cause race conditions and impede ongoing power up/down processing. For example, if a power down is in progress, MHI host updates to a local "disabled" execution environment. If a BHI interrupt fires later, that value gets replaced with one from the BHI EE register. This impacts the controller as it does not expect multiple RDDM execution environment change status callbacks as an example. Another issue would be that the device can enter mission mode and the execution environment is updated, while device creation for SBL channels is still going on due to slower PM state worker thread run, leading to multiple attempts at opening the same channel. Ensure that EE changes are handled only from appropriate places and occur one after another and handle only PBL modes or RDDM EE changes as critical events directly from the interrupt handler. Simplify handling by waiting for SYS ERROR before handling RDDM. This also makes sure that we use the correct execution environment to notify the controller driver when the device resets to one of the PBL execution environments. Signed-off-by: Bhaumik Bhatt Reviewed-by: Loic Poulain Reviewed-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/1614208985-20851-4-git-send-email-bbhatt@codeaurora.org Signed-off-by: Manivannan Sadhasivam Signed-off-by: Sasha Levin --- drivers/bus/mhi/core/main.c | 40 +++++++++++++++++++------------------ drivers/bus/mhi/core/pm.c | 7 ++++--- 2 files changed, 25 insertions(+), 22 deletions(-) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index ac60f74043e8..4d948ca9524c 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -398,7 +398,7 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv) struct device *dev = &mhi_cntrl->mhi_dev->dev; enum mhi_state state = MHI_STATE_MAX; enum mhi_pm_state pm_state = 0; - enum mhi_ee_type ee = 0; + enum mhi_ee_type ee = MHI_EE_MAX; write_lock_irq(&mhi_cntrl->pm_lock); if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) { @@ -407,8 +407,7 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv) } state = mhi_get_mhi_state(mhi_cntrl); - ee = mhi_cntrl->ee; - mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl); + ee = mhi_get_exec_env(mhi_cntrl); dev_dbg(dev, "local ee:%s device ee:%s dev_state:%s\n", TO_MHI_EXEC_STR(mhi_cntrl->ee), TO_MHI_EXEC_STR(ee), TO_MHI_STATE_STR(state)); @@ -420,27 +419,30 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv) } write_unlock_irq(&mhi_cntrl->pm_lock); - /* If device supports RDDM don't bother processing SYS error */ - if (mhi_cntrl->rddm_image) { - /* host may be performing a device power down already */ - if (!mhi_is_active(mhi_cntrl)) - goto exit_intvec; + if (pm_state != MHI_PM_SYS_ERR_DETECT || ee == mhi_cntrl->ee) + goto exit_intvec; - if (mhi_cntrl->ee == MHI_EE_RDDM && mhi_cntrl->ee != ee) { + switch (ee) { + case MHI_EE_RDDM: + /* proceed if power down is not already in progress */ + if (mhi_cntrl->rddm_image && mhi_is_active(mhi_cntrl)) { mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_RDDM); + mhi_cntrl->ee = ee; wake_up_all(&mhi_cntrl->state_event); } - goto exit_intvec; - } - - if (pm_state == MHI_PM_SYS_ERR_DETECT) { + break; + case MHI_EE_PBL: + case MHI_EE_EDL: + case MHI_EE_PTHRU: + mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_FATAL_ERROR); + mhi_cntrl->ee = ee; wake_up_all(&mhi_cntrl->state_event); - - /* For fatal errors, we let controller decide next step */ - if (MHI_IN_PBL(ee)) - mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_FATAL_ERROR); - else - mhi_pm_sys_err_handler(mhi_cntrl); + mhi_pm_sys_err_handler(mhi_cntrl); + break; + default: + wake_up_all(&mhi_cntrl->state_event); + mhi_pm_sys_err_handler(mhi_cntrl); + break; } exit_intvec: diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 3bd81d040380..596ff6400f17 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -377,21 +377,22 @@ static int mhi_pm_mission_mode_transition(struct mhi_controller *mhi_cntrl) { struct mhi_event *mhi_event; struct device *dev = &mhi_cntrl->mhi_dev->dev; - enum mhi_ee_type current_ee = mhi_cntrl->ee; + enum mhi_ee_type ee = MHI_EE_MAX, current_ee = mhi_cntrl->ee; int i, ret; dev_dbg(dev, "Processing Mission Mode transition\n"); write_lock_irq(&mhi_cntrl->pm_lock); if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) - mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl); + ee = mhi_get_exec_env(mhi_cntrl); - if (!MHI_IN_MISSION_MODE(mhi_cntrl->ee)) { + if (!MHI_IN_MISSION_MODE(ee)) { mhi_cntrl->pm_state = MHI_PM_LD_ERR_FATAL_DETECT; write_unlock_irq(&mhi_cntrl->pm_lock); wake_up_all(&mhi_cntrl->state_event); return -EIO; } + mhi_cntrl->ee = ee; write_unlock_irq(&mhi_cntrl->pm_lock); wake_up_all(&mhi_cntrl->state_event); -- 2.30.2