From patchwork Mon Apr 2 16:22:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 10320043 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 84F6860540 for ; Mon, 2 Apr 2018 16:20:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7700E20453 for ; Mon, 2 Apr 2018 16:20:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6B778205AB; Mon, 2 Apr 2018 16:20:02 +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=-6.9 required=2.0 tests=BAYES_00,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 0C067205AF for ; Mon, 2 Apr 2018 16:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752771AbeDBQT7 (ORCPT ); Mon, 2 Apr 2018 12:19:59 -0400 Received: from mga11.intel.com ([192.55.52.93]:40105 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752609AbeDBQT5 (ORCPT ); Mon, 2 Apr 2018 12:19:57 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Apr 2018 09:19:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,396,1517904000"; d="scan'208";a="40113146" Received: from unknown (HELO localhost.lm.intel.com) ([10.232.112.44]) by orsmga003.jf.intel.com with ESMTP; 02 Apr 2018 09:19:56 -0700 From: Keith Busch To: Linux PCI , Bjorn Helgaas Cc: Oza Pawandeep , Sinan Kaya , Keith Busch Subject: [PATCHv2 4/7] PCI/DPC: Defer event handling to work queue Date: Mon, 2 Apr 2018 10:22:00 -0600 Message-Id: <20180402162203.3370-5-keith.busch@intel.com> X-Mailer: git-send-email 2.13.6 In-Reply-To: <20180402162203.3370-1-keith.busch@intel.com> References: <20180402162203.3370-1-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/pcie-dpc.c | 53 ++++++++++++++++++++------------------------- 1 file changed, 24 insertions(+), 29 deletions(-) diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index 38b2d0586c72..a28901e88f7b 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -45,6 +45,8 @@ static const char * const rp_pio_error_string[] = { "Memory Request Completion Timeout", /* Bit Position 18 */ }; +static void dpc_process_rp_pio_error(struct dpc_dev *dpc); + static int dpc_wait_rp_inactive(struct dpc_dev *dpc) { unsigned long timeout = jiffies + HZ; @@ -87,7 +89,27 @@ static void dpc_work(struct work_struct *work) 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; - u16 cap = dpc->cap_pos; + u16 cap = dpc->cap_pos, status, source, reason, ext_reason; + + pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, &source); + + dev_info(&pdev->dev, "DPC containment event, status:%#06x source:%#06x\n", + status, source); + + reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN) >> 1; + ext_reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT) >> 5; + + dev_warn(&pdev->dev, "DPC %s detected, remove downstream devices\n", + (reason == 0) ? "unmasked uncorrectable error" : + (reason == 1) ? "ERR_NONFATAL" : + (reason == 2) ? "ERR_FATAL" : + (ext_reason == 0) ? "RP PIO error" : + (ext_reason == 1) ? "software trigger" : + "reserved error"); + + if (dpc->rp_extensions && reason == 3 && ext_reason == 0) + dpc_process_rp_pio_error(dpc); pci_lock_rescan_remove(); list_for_each_entry_safe_reverse(dev, temp, &parent->devices, @@ -176,39 +198,12 @@ static irqreturn_t dpc_irq(int irq, void *context) { struct dpc_dev *dpc = (struct dpc_dev *)context; struct pci_dev *pdev = dpc->dev->port; - struct device *dev = &dpc->dev->device; - u16 cap = dpc->cap_pos, status, source, reason, ext_reason; + 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; - 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); - - dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n", - 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" : - (reason == 2) ? "ERR_FATAL" : - (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); - pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, PCI_EXP_DPC_STATUS_INTERRUPT); if (status & PCI_EXP_DPC_STATUS_TRIGGER)