From patchwork Wed Jun 20 21:38:28 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 10478751 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 B2C9C600F6 for ; Wed, 20 Jun 2018 21:35:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A51EC290B1 for ; Wed, 20 Jun 2018 21:35:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 99A99290E1; Wed, 20 Jun 2018 21:35:25 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI 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 3B22D290E3 for ; Wed, 20 Jun 2018 21:35:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933437AbeFTVfX (ORCPT ); Wed, 20 Jun 2018 17:35:23 -0400 Received: from mga03.intel.com ([134.134.136.65]:20584 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933326AbeFTVfX (ORCPT ); Wed, 20 Jun 2018 17:35:23 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Jun 2018 14:35:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,249,1526367600"; d="scan'208";a="238905910" Received: from unknown (HELO localhost.lm.intel.com) ([10.232.112.44]) by fmsmga005.fm.intel.com with ESMTP; 20 Jun 2018 14:35:21 -0700 From: Keith Busch To: Linux PCI , Bjorn Helgaas Cc: Sinan Kaya , Oza Pawandeep , Keith Busch Subject: [PATCH 2/7] PCI/DPC: Defer event handling to work queue Date: Wed, 20 Jun 2018 15:38:28 -0600 Message-Id: <20180620213833.25072-2-keith.busch@intel.com> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20180620213833.25072-1-keith.busch@intel.com> References: <20180620213833.25072-1-keith.busch@intel.com> 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 This moves all event handling to the existing work queue, which will make passing event information simpler to the handler. Signed-off-by: Keith Busch --- drivers/pci/pcie/dpc.c | 44 ++++++++++++++++++++------------------------ 1 file changed, 20 insertions(+), 24 deletions(-) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 972aac892846..5f5fac279c75 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -108,14 +108,6 @@ static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev) return PCI_ERS_RESULT_RECOVERED; } -static void dpc_work(struct work_struct *work) -{ - struct dpc_dev *dpc = container_of(work, struct dpc_dev, work); - struct pci_dev *pdev = dpc->dev->port; - - /* We configure DPC so it only triggers on ERR_FATAL */ - pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC); -} static void dpc_process_rp_pio_error(struct dpc_dev *dpc) { @@ -174,33 +166,21 @@ static void dpc_process_rp_pio_error(struct dpc_dev *dpc) } } -static irqreturn_t dpc_irq(int irq, void *context) +static void dpc_work(struct work_struct *work) { - struct dpc_dev *dpc = (struct dpc_dev *)context; + struct dpc_dev *dpc = container_of(work, struct dpc_dev, work); struct pci_dev *pdev = dpc->dev->port; struct device *dev = &dpc->dev->device; u16 cap = dpc->cap_pos, status, source, reason, ext_reason; pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); - - if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT) || status == (u16)(~0)) - return IRQ_NONE; - - if (!(status & PCI_EXP_DPC_STATUS_TRIGGER)) { - pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, - PCI_EXP_DPC_STATUS_INTERRUPT); - return IRQ_HANDLED; - } - - pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, - &source); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, &source); dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n", - status, source); + status, source); reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN) >> 1; ext_reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT) >> 5; - dev_warn(dev, "DPC %s detected, remove downstream devices\n", (reason == 0) ? "unmasked uncorrectable error" : (reason == 1) ? "ERR_NONFATAL" : @@ -208,10 +188,26 @@ static irqreturn_t dpc_irq(int irq, void *context) (ext_reason == 0) ? "RP PIO error" : (ext_reason == 1) ? "software trigger" : "reserved error"); + /* show RP PIO error detail information */ if (dpc->rp_extensions && reason == 3 && ext_reason == 0) dpc_process_rp_pio_error(dpc); + /* We configure DPC so it only triggers on ERR_FATAL */ + pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC); +} + +static irqreturn_t dpc_irq(int irq, void *context) +{ + struct dpc_dev *dpc = (struct dpc_dev *)context; + struct pci_dev *pdev = dpc->dev->port; + u16 cap = dpc->cap_pos, status; + + pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); + + if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT) || status == (u16)(~0)) + return IRQ_NONE; + pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, PCI_EXP_DPC_STATUS_INTERRUPT); if (status & PCI_EXP_DPC_STATUS_TRIGGER)