Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755370AbbFBCsH (ORCPT ); Mon, 1 Jun 2015 22:48:07 -0400 Received: from mga09.intel.com ([134.134.136.24]:30237 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755016AbbFBCr3 (ORCPT ); Mon, 1 Jun 2015 22:47:29 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,536,1427785200"; d="scan'208";a="735345004" From: Jiang Liu To: Thomas Gleixner , "Rafael J . Wysocki" , Bjorn Helgaas Cc: Jiang Liu , LKML , linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, "x86 @ kernel . org" Subject: [Patch v2 4/4] PCI, MSI: Optionally free legacy PCI IRQ when enabling MSI/MSI-X Date: Tue, 2 Jun 2015 10:49:19 +0800 Message-Id: <1433213360-3700-5-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1433213360-3700-1-git-send-email-jiang.liu@linux.intel.com> References: <1433213360-3700-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1761 Lines: 58 Once PCI MSI/MSI-X is enabled by the device driver, PCI device won't make use of legacy PCI IRQ until PCI MSI/MSI-X is disabled again. So optionally free legacy PCI IRQ when enabling MSI/MSI-X and reallocate when disabling MSI/MSI-X. Signed-off-by: Jiang Liu --- drivers/pci/msi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index c3e7dfcf9ff5..47cf72c669f0 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -686,6 +686,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) msi_set_enable(dev, 1); dev->msi_enabled = 1; + pcibios_free_irq(dev); dev->irq = entry->irq; return 0; } @@ -813,9 +814,10 @@ static int msix_capability_init(struct pci_dev *dev, /* Set MSI-X enabled bits and unmask the function */ pci_intx_for_msi(dev, 0); dev->msix_enabled = 1; - msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0); + pcibios_free_irq(dev); + return 0; out_avail: @@ -930,6 +932,7 @@ void pci_msi_shutdown(struct pci_dev *dev) /* Restore dev->irq to its default pin-assertion irq */ dev->irq = desc->msi_attrib.default_irq; + pcibios_alloc_irq(dev); } void pci_disable_msi(struct pci_dev *dev) @@ -1030,6 +1033,7 @@ void pci_msix_shutdown(struct pci_dev *dev) msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0); pci_intx_for_msi(dev, 1); dev->msix_enabled = 0; + pcibios_alloc_irq(dev); } void pci_disable_msix(struct pci_dev *dev) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/