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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 D30F0C4361B for ; Mon, 14 Dec 2020 14:19:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90F9622BEF for ; Mon, 14 Dec 2020 14:19:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2440037AbgLNOT4 (ORCPT ); Mon, 14 Dec 2020 09:19:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2440034AbgLNOTy (ORCPT ); Mon, 14 Dec 2020 09:19:54 -0500 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CC49C0617A7 for ; Mon, 14 Dec 2020 06:18:37 -0800 (PST) Received: by mail-wr1-x441.google.com with SMTP id 91so16572236wrj.7 for ; Mon, 14 Dec 2020 06:18:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=S8Vz3+deGb93+mWrPvYJGVU2WIAkVuBlEajZVdacAuo=; b=QNDgGHdTYCp9W2u1m6Zf7bM9gDys3YKtPrt3yC6niUomcomswTVYajt6YCvLvljK2G ZPY4d5RY5RiWfg+lHzAQuoBc5dzsiXfV4BiirS2Usn9gWYwkKq8ZNZWFY8MRN+3a6GQ+ IkOlRXq2ItSPelfuzhibNJ8roXwxqpiFGzlcaULWBjMDKdZSokWBRQrQUAfemVqAuCmu 1Xs+LqkxG+5Dn4OYWyI+yuNXEbrW7yzfpkJVbpMkPX4iJrHO0UVOkYoT8qGVMuy8dhBt BqYSmAZDmjiCYvCUw3h6j/mEdXX9oNZuWDKH8xHnTXydefy9j8pkumzXph67X4X6kAbD X3LA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=S8Vz3+deGb93+mWrPvYJGVU2WIAkVuBlEajZVdacAuo=; b=g8W5orYyOmSswR5qINz/HR5BiCf7dZ/w4dbFVCk9Ajxx4wsQst+VQdKGRa//gTQzTE 3bTWEXBvY6H2YNxiPOtUpK6xXz4/5btEgQ2ciomQrGc2xcUSY4/MiTh37nAdLtWb0C6t ro271MXjcTIMmlNhVszXDXwGzhLDKPlP0U5mK9mx35ebQ+Mft4uCWT10WAG+Zo5xbMea Ymc41K7stROChIPInqrlFc9lFVKnVR4Orv5x6Sv4djdMz0rSTjxO2fWBykeY43Hfx8uB 153Av89rDdjSJp236euUQjltNezgU1WJJA3HEMPSYFFP9J801KxTJ2YAiVnrn7q8N6dw 301w== X-Gm-Message-State: AOAM531aMDw8LInE4A7XC7C2/cq9WYfiuikzmg7fNWfUst4MIKnDwVt4 qi9XJ35zDGwLaM/envkZI2sXVg== X-Google-Smtp-Source: ABdhPJzNpENL75w2LeGFz1fzu8RsgEVZP8iHH3BQvNe8lCwcryYvUSHeGATdnGzsT6KaHsv9pTTY6g== X-Received: by 2002:adf:8b15:: with SMTP id n21mr28746992wra.426.1607955516016; Mon, 14 Dec 2020 06:18:36 -0800 (PST) Received: from localhost.localdomain ([2a01:e0a:490:8730:f2e4:25b3:2b53:52cd]) by smtp.gmail.com with ESMTPSA id h5sm34126285wrp.56.2020.12.14.06.18.35 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 14 Dec 2020 06:18:35 -0800 (PST) From: Loic Poulain To: manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, bbhatt@codeaurora.org, Loic Poulain Subject: [PATCH v5 07/10] mhi: pci_generic: Add PCI error handlers Date: Mon, 14 Dec 2020 15:25:34 +0100 Message-Id: <1607955937-26951-8-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1607955937-26951-1-git-send-email-loic.poulain@linaro.org> References: <1607955937-26951-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org In AER capable root complex, errors are reported to the host which can then act accordingly and perform PCI recovering procedure. This patch enables error reporting and implements error_detected, slot_reset and resume callbacks. Signed-off-by: Loic Poulain Reviewed-by Hemant Kumar --- drivers/bus/mhi/pci_generic.c | 50 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c index 0936701..b4a68bd 100644 --- a/drivers/bus/mhi/pci_generic.c +++ b/drivers/bus/mhi/pci_generic.c @@ -8,6 +8,7 @@ * Copyright (C) 2020 Linaro Ltd */ +#include #include #include #include @@ -403,6 +404,8 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) pci_save_state(pdev); mhi_pdev->pci_state = pci_store_saved_state(pdev); + pci_enable_pcie_error_reporting(pdev); + err = mhi_register_controller(mhi_cntrl, mhi_cntrl_config); if (err) return err; @@ -499,7 +502,54 @@ static void mhi_pci_reset_done(struct pci_dev *pdev) set_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status); } +static pci_ers_result_t mhi_pci_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + struct mhi_controller *mhi_cntrl = &mhi_pdev->mhi_cntrl; + + dev_err(&pdev->dev, "PCI error detected, state = %u\n", state); + + if (state == pci_channel_io_perm_failure) + return PCI_ERS_RESULT_DISCONNECT; + + /* Clean up MHI state */ + if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) { + mhi_power_down(mhi_cntrl, false); + mhi_unprepare_after_power_down(mhi_cntrl); + } else { + /* Nothing to do */ + return PCI_ERS_RESULT_RECOVERED; + } + + pci_disable_device(pdev); + + return PCI_ERS_RESULT_NEED_RESET; +} + +static pci_ers_result_t mhi_pci_slot_reset(struct pci_dev *pdev) +{ + if (pci_enable_device(pdev)) { + dev_err(&pdev->dev, "Cannot re-enable PCI device after reset.\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + + return PCI_ERS_RESULT_RECOVERED; +} + +static void mhi_pci_io_resume(struct pci_dev *pdev) +{ + struct mhi_pci_device *mhi_pdev = pci_get_drvdata(pdev); + + dev_err(&pdev->dev, "PCI slot reset done\n"); + + queue_work(system_long_wq, &mhi_pdev->recovery_work); +} + static const struct pci_error_handlers mhi_pci_err_handler = { + .error_detected = mhi_pci_error_detected, + .slot_reset = mhi_pci_slot_reset, + .resume = mhi_pci_io_resume, .reset_prepare = mhi_pci_reset_prepare, .reset_done = mhi_pci_reset_done, }; -- 2.7.4