From patchwork Sat Jan 20 06:35:16 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 10176289 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 B380F6023A for ; Sat, 20 Jan 2018 06:36:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A33A42880B for ; Sat, 20 Jan 2018 06:36:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 97D45287D1; Sat, 20 Jan 2018 06:36:20 +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=ham 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 AEE722880D for ; Sat, 20 Jan 2018 06:36:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754993AbeATGgN (ORCPT ); Sat, 20 Jan 2018 01:36:13 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:45670 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751039AbeATGfr (ORCPT ); Sat, 20 Jan 2018 01:35:47 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id B329060A26; Sat, 20 Jan 2018 06:35:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1516430146; bh=e4E/r9uxYQy8L7Ku0ceHpZpVBDRNWuirMViuC+s0jD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SnhDVfUc3GXrh90uJ00G5bBYSovNlrvCaTA6+9kZbBnY2IyIvwjsaNfdE+2oGP+ed COU/y0cQWnA24909UQuMhO77bbbJMhjiaHGf3I49YrXRZT8yuWxRGsQk6SP7pxicEC 8pAV89WPttP82bbKIqf4H/TPnZmEBVShj8Z+nLls= 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 1AD9960A61; Sat, 20 Jan 2018 06:35:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1516430145; bh=e4E/r9uxYQy8L7Ku0ceHpZpVBDRNWuirMViuC+s0jD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GzoSvCJrWsyEfUT9fSrtIO4uVy4Rziaz5/HH0cTy9eCDTqRDP/NnyaT+fvvE8G0rP ndW6DOeO/zjmDLrFIDMqdwL+C3A5pHOJxfKimaAATnSozQ4qtWCpIe4WTRilzspVN+ tSBaM+H5AXLM5DgdgDiUcyEu3C5NDSukyiTRAybc= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 1AD9960A61 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 v7 4/7] PCI/DPC: Unify and plumb error handling into DPC Date: Sat, 20 Jan 2018 12:05:16 +0530 Message-Id: <1516430119-3825-5-git-send-email-poza@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1516430119-3825-1-git-send-email-poza@codeaurora.org> References: <1516430119-3825-1-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/pci.h b/drivers/pci/pci.h index 665ff6c..3b79593 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -343,8 +343,12 @@ static inline resource_size_t pci_resource_alignment(struct pci_dev *dev, void pci_enable_acs(struct pci_dev *dev); /* PCI error reporting and recovery */ +#define DPC_FATAL 4 + void pci_do_recovery(struct pci_dev *dev, int severity); + + #ifdef CONFIG_PCIE_PTM void pci_ptm_init(struct pci_dev *dev); #else diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index 2d976a6..b5c9fbd 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -15,6 +15,9 @@ #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 +70,60 @@ 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 +161,23 @@ 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 +194,7 @@ 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 +204,17 @@ 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, DPC_FATAL); } static void dpc_rp_pio_print_tlp_header(struct device *dev, @@ -339,6 +419,7 @@ 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 8318c84..05385c0 100644 --- a/drivers/pci/pcie/pcie-err.c +++ b/drivers/pci/pcie/pcie-err.c @@ -19,6 +19,7 @@ #include #include #include "portdrv.h" +#include "./../pci.h" static DEFINE_MUTEX(pci_err_recovery_lock); @@ -181,7 +182,7 @@ static pci_ers_result_t default_reset_link(struct pci_dev *dev) return PCI_ERS_RESULT_RECOVERED; } -static pci_ers_result_t reset_link(struct pci_dev *dev) +static pci_ers_result_t reset_link(struct pci_dev *dev, int severity) { struct pci_dev *udev; pci_ers_result_t status; @@ -195,9 +196,17 @@ static pci_ers_result_t 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 == 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 == AER_FATAL) || + (severity == AER_NONFATAL) || + (severity == AER_CORRECTABLE)) + driver = pci_find_aer_service(udev); #endif if (driver && driver->reset_link) { @@ -287,7 +296,8 @@ void pci_do_recovery(struct pci_dev *dev, int severity) mutex_lock(&pci_err_recovery_lock); - if (severity == AER_FATAL) + if ((severity == AER_FATAL) || + (severity == DPC_FATAL)) state = pci_channel_io_frozen; else state = pci_channel_io_normal; @@ -297,8 +307,9 @@ void pci_do_recovery(struct pci_dev *dev, int severity) "error_detected", report_error_detected); - if (severity == AER_FATAL) { - result = reset_link(dev); + if ((severity == AER_FATAL) || + (severity == DPC_FATAL)) { + result = reset_link(dev, severity); if (result != PCI_ERS_RESULT_RECOVERED) goto failed; } @@ -335,6 +346,6 @@ void pci_do_recovery(struct pci_dev *dev, int severity) failed: /* TODO: Should kernel panic here? */ - dev_info(&dev->dev, "Device recovery failed\n"); 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_ */