From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id F011FA2EFC for ; Fri, 20 Sep 2019 02:51:03 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 479101F16A; Fri, 20 Sep 2019 02:51:03 +0200 (CEST) Received: from mail5.wrs.com (mail5.windriver.com [192.103.53.11]) by dpdk.org (Postfix) with ESMTP id C757C1E20 for ; Fri, 20 Sep 2019 02:51:01 +0200 (CEST) Received: from ALA-HCB.corp.ad.wrs.com (ala-hcb.corp.ad.wrs.com [147.11.189.41]) by mail5.wrs.com (8.15.2/8.15.2) with ESMTPS id x8K0oO0K020365 (version=TLSv1 cipher=AES128-SHA bits=128 verify=FAIL); Thu, 19 Sep 2019 17:50:34 -0700 Received: from pek-lpggp6.wrs.com (128.224.153.40) by ALA-HCB.corp.ad.wrs.com (147.11.189.41) with Microsoft SMTP Server id 14.3.468.0; Thu, 19 Sep 2019 17:50:13 -0700 From: Yongxin Liu To: CC: , , , , , Date: Fri, 20 Sep 2019 08:45:25 +0800 Message-ID: <20190920004525.18259-1-yongxin.liu@windriver.com> X-Mailer: git-send-email 2.14.4 MIME-Version: 1.0 Content-Type: text/plain Subject: [dpdk-dev] [RFC] igb_uio: change ISR to be threaded when using with RT kernel X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" When igb_uio driver is used with RT kernel, the interrupt handler should not use IRQF_NO_THREAD as a flag, since uio_event_notify will call rt_spin_lock which might sleep. Here is the calltrace. [ 2034.457805] Call Trace: [ 2034.460818] [ 2034.463397] dump_stack+0x70/0x9a [ 2034.467281] ___might_sleep.cold+0xe1/0xf2 [ 2034.471943] rt_spin_lock+0x55/0x70 [ 2034.475994] ? __wake_up_common_lock+0x61/0xb0 [ 2034.481004] __wake_up_common_lock+0x61/0xb0 [ 2034.485842] __wake_up+0x13/0x20 [ 2034.489635] uio_event_notify+0x2c/0x50 [uio] [ 2034.494560] igbuio_pci_irqhandler+0x1f/0x40 [igb_uio] [ 2034.500262] __handle_irq_event_percpu+0x5f/0x3f0 [ 2034.505532] ? cpuidle_enter_state+0xd3/0x500 [ 2034.510454] handle_irq_event_percpu+0x4b/0x90 [ 2034.515462] handle_irq_event+0x3c/0x5b [ 2034.519864] handle_edge_irq+0xbb/0x210 [ 2034.524264] handle_irq+0x23/0x30 [ 2034.528143] do_IRQ+0x7e/0x150 [ 2034.531764] common_interrupt+0xf/0xf [ 2034.535990] Signed-off-by: Yongxin Liu --- kernel/linux/igb_uio/igb_uio.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/kernel/linux/igb_uio/igb_uio.c b/kernel/linux/igb_uio/igb_uio.c index 039f5a5f6..9d7380fb7 100644 --- a/kernel/linux/igb_uio/igb_uio.c +++ b/kernel/linux/igb_uio/igb_uio.c @@ -221,7 +221,6 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev) msix_entry.entry = 0; if (pci_enable_msix(udev->pdev, &msix_entry, 1) == 0) { dev_dbg(&udev->pdev->dev, "using MSI-X"); - udev->info.irq_flags = IRQF_NO_THREAD; udev->info.irq = msix_entry.vector; udev->mode = RTE_INTR_MODE_MSIX; break; @@ -229,7 +228,6 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev) #else if (pci_alloc_irq_vectors(udev->pdev, 1, 1, PCI_IRQ_MSIX) == 1) { dev_dbg(&udev->pdev->dev, "using MSI-X"); - udev->info.irq_flags = IRQF_NO_THREAD; udev->info.irq = pci_irq_vector(udev->pdev, 0); udev->mode = RTE_INTR_MODE_MSIX; break; @@ -241,7 +239,6 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev) #ifndef HAVE_ALLOC_IRQ_VECTORS if (pci_enable_msi(udev->pdev) == 0) { dev_dbg(&udev->pdev->dev, "using MSI"); - udev->info.irq_flags = IRQF_NO_THREAD; udev->info.irq = udev->pdev->irq; udev->mode = RTE_INTR_MODE_MSI; break; @@ -249,7 +246,6 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev) #else if (pci_alloc_irq_vectors(udev->pdev, 1, 1, PCI_IRQ_MSI) == 1) { dev_dbg(&udev->pdev->dev, "using MSI"); - udev->info.irq_flags = IRQF_NO_THREAD; udev->info.irq = pci_irq_vector(udev->pdev, 0); udev->mode = RTE_INTR_MODE_MSI; break; @@ -259,7 +255,7 @@ igbuio_pci_enable_interrupts(struct rte_uio_pci_dev *udev) case RTE_INTR_MODE_LEGACY: if (pci_intx_mask_supported(udev->pdev)) { dev_dbg(&udev->pdev->dev, "using INTX"); - udev->info.irq_flags = IRQF_SHARED | IRQF_NO_THREAD; + udev->info.irq_flags = IRQF_SHARED; udev->info.irq = udev->pdev->irq; udev->mode = RTE_INTR_MODE_LEGACY; break; -- 2.14.4