From patchwork Tue Jan 16 09:58:42 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 10166301 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id B8F8A601E7 for ; Tue, 16 Jan 2018 10:00:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C004C28332 for ; Tue, 16 Jan 2018 10:00:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4A9C283A5; Tue, 16 Jan 2018 10:00:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 12FCC28332 for ; Tue, 16 Jan 2018 10:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751582AbeAPKAD (ORCPT ); Tue, 16 Jan 2018 05:00:03 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:57542 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750868AbeAPJ7M (ORCPT ); Tue, 16 Jan 2018 04:59:12 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 0769E60A08; Tue, 16 Jan 2018 09:59:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1516096752; bh=WrLkhw2PDFutB1zvOClmpFvCA5nX4aL04vmYjbQVGvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VMNj+0yCutZ8dbLPeeG+/pY5jlTA2+/muLuA1Nt4/68JyzRFMBQyZvMfJV7DHJ6k/ TVkO0/b5mO3AOzhyDwFljo+Y//IPKm6kUcIGwhwKkGHn4CSL0uvTaoJr5f8g+I+Ulz at364Uhh11vjrmr31qwz7cp7/o6wRIfZTZZ25K3I= Received: from blr-ubuntu-poza.qualcomm.com (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: poza@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 0E124608BF; Tue, 16 Jan 2018 09:59:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1516096750; bh=WrLkhw2PDFutB1zvOClmpFvCA5nX4aL04vmYjbQVGvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RCNgx6UA03sfjNjT559tps2FJfy9JmIzJKZWFXHpXQ0vL/S8UD810+SI176e1fA2P gewSMXDBsBBBPZD1wtu11aZeZEdALpvt9IFY/psb+WeAikfDglXPAJ45+QQx2swleJ d9721wxTJm+YHXP6VBRGBG4/Z6YVisAa84mXRpso= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0E124608BF 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=poza@codeaurora.org From: Oza Pawandeep To: Bjorn Helgaas , Philippe Ombredanne , Thomas Gleixner , Greg Kroah-Hartman , Kate Stewart , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Dongdong Liu , Keith Busch , Wei Zhang , Sinan Kaya , Timur Tabi Cc: Oza Pawandeep Subject: [PATCH v4 4/5] PCI/DPC: Unify and plumb error handling into DPC Date: Tue, 16 Jan 2018 15:28:42 +0530 Message-Id: <1516096723-8013-5-git-send-email-poza@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1516096723-8013-1-git-send-email-poza@codeaurora.org> References: <1516096723-8013-1-git-send-email-poza@codeaurora.org> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Current DPC driver does not do recovery, e.g. calling end-point's driver's callbacks, which sanitize the sw. DPC driver implements link_reset callback, and calls pci_do_recovery. Signed-off-by: Oza Pawandeep diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index 2d976a6..31799f6 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -13,8 +13,12 @@ #include #include #include +#include #include #include "../pci.h" +#include "portdrv.h" + +static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev); struct rp_pio_header_log_regs { u32 dw0; @@ -67,6 +71,60 @@ struct dpc_dev { "Memory Request Completion Timeout", /* Bit Position 18 */ }; +static int find_dpc_dev_iter(struct device *device, void *data) +{ + struct pcie_port_service_driver *service_driver; + struct device **dev; + + dev = (struct device **) data; + + if (device->bus == &pcie_port_bus_type && device->driver) { + service_driver = to_service_driver(device->driver); + if (service_driver->service == PCIE_PORT_SERVICE_DPC) { + *dev = device; + return 1; + } + } + + return 0; +} + +static struct device *pci_find_dpc_dev(struct pci_dev *pdev) +{ + struct device *dev = NULL; + + device_for_each_child(&pdev->dev, &dev, find_dpc_dev_iter); + + return dev; +} + +static int find_dpc_service_iter(struct device *device, void *data) +{ + struct pcie_port_service_driver *service_driver, **drv; + + drv = (struct pcie_port_service_driver **) data; + + if (device->bus == &pcie_port_bus_type && device->driver) { + service_driver = to_service_driver(device->driver); + if (service_driver->service == PCIE_PORT_SERVICE_DPC) { + *drv = service_driver; + return 1; + } + } + + return 0; +} + +struct pcie_port_service_driver *pci_find_dpc_service(struct pci_dev *dev) +{ + struct pcie_port_service_driver *drv = NULL; + + device_for_each_child(&dev->dev, &drv, find_dpc_service_iter); + + return drv; +} +EXPORT_SYMBOL(pci_find_dpc_service); + static int dpc_wait_rp_inactive(struct dpc_dev *dpc) { unsigned long timeout = jiffies + HZ; @@ -104,11 +162,23 @@ static void dpc_wait_link_inactive(struct dpc_dev *dpc) dev_warn(dev, "Link state not disabled for DPC event\n"); } -static void interrupt_event_handler(struct work_struct *work) +/** + * dpc_reset_link - reset link DPC routine + * @dev: pointer to Root Port's pci_dev data structure + * + * Invoked by Port Bus driver when performing link reset at Root Port. + */ +static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev) { - struct dpc_dev *dpc = container_of(work, struct dpc_dev, work); - struct pci_dev *dev, *temp, *pdev = dpc->dev->port; struct pci_bus *parent = pdev->subordinate; + struct pci_dev *dev, *temp; + struct dpc_dev *dpc; + struct pcie_device *pciedev; + struct device *devdpc; + + devdpc = pci_find_dpc_dev(pdev); + pciedev = to_pcie_device(devdpc); + dpc = get_service_data(pciedev); pci_lock_rescan_remove(); list_for_each_entry_safe_reverse(dev, temp, &parent->devices, @@ -125,7 +195,7 @@ static void interrupt_event_handler(struct work_struct *work) dpc_wait_link_inactive(dpc); if (dpc->rp && dpc_wait_rp_inactive(dpc)) - return; + return PCI_ERS_RESULT_DISCONNECT; if (dpc->rp && dpc->rp_pio_status) { pci_write_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_STATUS, @@ -135,6 +205,17 @@ static void interrupt_event_handler(struct work_struct *work) pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT); + + return PCI_ERS_RESULT_RECOVERED; +} + +static void interrupt_event_handler(struct work_struct *work) +{ + struct dpc_dev *dpc = container_of(work, struct dpc_dev, work); + struct pci_dev *pdev = dpc->dev->port; + + /* From DPC point of view error is always FATAL. */ + pci_do_recovery(pdev, PCI_ERR_DPC_FATAL); } static void dpc_rp_pio_print_tlp_header(struct device *dev, @@ -339,6 +420,7 @@ static void dpc_remove(struct pcie_device *dev) .service = PCIE_PORT_SERVICE_DPC, .probe = dpc_probe, .remove = dpc_remove, + .reset_link = dpc_reset_link, }; static int __init dpc_service_init(void) diff --git a/drivers/pci/pcie/pcie-err.c b/drivers/pci/pcie/pcie-err.c index 63566b1..14b9153 100644 --- a/drivers/pci/pcie/pcie-err.c +++ b/drivers/pci/pcie/pcie-err.c @@ -21,6 +21,8 @@ #include #include "portdrv.h" +static DEFINE_MUTEX(pci_err_recovery_lock); + struct pci_err_broadcast_data { enum pci_channel_state state; enum pci_ers_result result; @@ -180,7 +182,7 @@ static pci_ers_result_t pci_default_reset_link(struct pci_dev *dev) return PCI_ERS_RESULT_RECOVERED; } -pci_ers_result_t pci_reset_link(struct pci_dev *dev) +pci_ers_result_t pci_reset_link(struct pci_dev *dev, int severity) { struct pci_dev *udev; pci_ers_result_t status; @@ -194,9 +196,17 @@ pci_ers_result_t pci_reset_link(struct pci_dev *dev) udev = dev->bus->self; } + + /* Use the service driver of the component firstly */ +#if IS_ENABLED(CONFIG_PCIE_DPC) + if (severity == PCI_ERR_DPC_FATAL) + driver = pci_find_dpc_service(udev); +#endif #if IS_ENABLED(CONFIG_PCIEAER) - /* Use the aer driver of the component firstly */ - driver = pci_find_aer_service(udev); + if ((severity == PCI_ERR_AER_FATAL) || + (severity == PCI_ERR_AER_NONFATAL) || + (severity == PCI_ERR_AER_CORRECTABLE)) + driver = pci_find_aer_service(udev); #endif if (driver && driver->reset_link) { @@ -284,7 +294,10 @@ void pci_do_recovery(struct pci_dev *dev, int severity) pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED; enum pci_channel_state state; - if (severity == PCI_ERR_AER_FATAL) + mutex_lock(&pci_err_recovery_lock); + + if ((severity == PCI_ERR_AER_FATAL) || + (severity == PCI_ERR_DPC_FATAL)) state = pci_channel_io_frozen; else state = pci_channel_io_normal; @@ -294,8 +307,9 @@ void pci_do_recovery(struct pci_dev *dev, int severity) "error_detected", pci_report_error_detected); - if (severity == PCI_ERR_AER_FATAL) { - result = pci_reset_link(dev); + if ((severity == PCI_ERR_AER_FATAL) || + (severity == PCI_ERR_DPC_FATAL)) { + result = pci_reset_link(dev, severity); if (result != PCI_ERS_RESULT_RECOVERED) goto failed; } @@ -327,9 +341,11 @@ void pci_do_recovery(struct pci_dev *dev, int severity) pci_report_resume); dev_info(&dev->dev, "Device recovery successful\n"); + mutex_unlock(&pci_err_recovery_lock); return; failed: /* TODO: Should kernel panic here? */ + mutex_unlock(&pci_err_recovery_lock); dev_info(&dev->dev, "Device recovery failed\n"); } diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h index 4f1992d..b013e24 100644 --- a/drivers/pci/pcie/portdrv.h +++ b/drivers/pci/pcie/portdrv.h @@ -80,4 +80,5 @@ static inline void pcie_port_platform_notify(struct pci_dev *port, int *mask){} #endif /* !CONFIG_ACPI */ struct pcie_port_service_driver *pci_find_aer_service(struct pci_dev *dev); +struct pcie_port_service_driver *pci_find_dpc_service(struct pci_dev *dev); #endif /* _PORTDRV_H_ */ diff --git a/include/linux/pci_err.h b/include/linux/pci_err.h index 3710759..e253126 100644 --- a/include/linux/pci_err.h +++ b/include/linux/pci_err.h @@ -7,5 +7,7 @@ #define PCI_ERR_AER_FATAL 1 #define PCI_ERR_AER_CORRECTABLE 2 +#define PCI_ERR_DPC_FATAL 4 + void pci_do_recovery(struct pci_dev *dev, int severity); #endif /* _PCI_ERR_H_ */