From patchwork Thu Jan 14 19:16:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 362916 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=-16.8 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,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 348E8C433E0 for ; Thu, 14 Jan 2021 19:18:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D601323B46 for ; Thu, 14 Jan 2021 19:18:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729884AbhANTRn (ORCPT ); Thu, 14 Jan 2021 14:17:43 -0500 Received: from m43-15.mailgun.net ([69.72.43.15]:14393 "EHLO m43-15.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729770AbhANTRn (ORCPT ); Thu, 14 Jan 2021 14:17:43 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1610651839; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=2CS72TCnxt3Fqc0caK4ll84m6yjTGbSgg54c4Wku140=; b=uXNhG0dYU0lg/1DY8k7NyE8/vWbUEVWhDje84sR8k9HSAmTZXCjpg3ndHNgoaaoQ0iCeaivE KSHrLkV+6SXdfF87gX0BXPtDNkGr81ymwGeqfmD9yc7qn87ALcJG8A25ujBAljLSY807GR4M fV/QY5DD6bI1tIu8FvV0Kg3h0t4= X-Mailgun-Sending-Ip: 69.72.43.15 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n10.prod.us-west-2.postgun.com with SMTP id 6000989e9dddba11a6cce4be (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 14 Jan 2021 19:16:46 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 0DBFCC43461; Thu, 14 Jan 2021 19:16:46 +0000 (UTC) Received: from malabar-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: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id F24A6C433C6; Thu, 14 Jan 2021 19:16:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org F24A6C433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org, carl.yin@quectel.com, naveen.kumar@quectel.com, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, Bhaumik Bhatt Subject: [PATCH v2 3/3] bus: mhi: core: Process execution environment changes serially Date: Thu, 14 Jan 2021 11:16:35 -0800 Message-Id: <1610651795-31287-4-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1610651795-31287-1-git-send-email-bbhatt@codeaurora.org> References: <1610651795-31287-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org In current design, whenever the BHI interrupt is fired, the execution environment is updated. This can cause race conditions and impede any ongoing power up/down processing. For example, if a power down is in progress and the host has updated the execution environment to a local "disabled" state, any BHI interrupt firing later could replace it with the value from the BHI EE register. Another example would be that the device can enter mission mode while device creation for SBL is still going on, 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 or RDDM EE changes as critical events directly from the interrupt handler. 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 --- drivers/bus/mhi/core/main.c | 14 ++++++++------ drivers/bus/mhi/core/pm.c | 5 +++-- 2 files changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 1a7192e..2929e9f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -411,7 +411,7 @@ 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)) { @@ -420,8 +420,7 @@ 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)); @@ -439,8 +438,9 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv) if (!mhi_is_active(mhi_cntrl)) goto exit_intvec; - if (mhi_cntrl->ee == MHI_EE_RDDM && mhi_cntrl->ee != ee) { + if (ee == MHI_EE_RDDM && mhi_cntrl->ee != MHI_EE_RDDM) { mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_RDDM); + mhi_cntrl->ee = ee; wake_up_all(&mhi_cntrl->state_event); } goto exit_intvec; @@ -450,10 +450,12 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv) wake_up_all(&mhi_cntrl->state_event); /* For fatal errors, we let controller decide next step */ - if (MHI_IN_PBL(ee)) + if (MHI_IN_PBL(ee)) { mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_FATAL_ERROR); - else + mhi_cntrl->ee = ee; + } else { mhi_pm_sys_err_handler(mhi_cntrl); + } } exit_intvec: diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 44aa7eb..c870fa8 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -384,14 +384,15 @@ static int mhi_pm_mission_mode_transition(struct mhi_controller *mhi_cntrl) 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);