From 27ddb689909cd0bab30524a5f720ae3a3e55acac Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Wed, 1 Feb 2017 09:53:15 -0800 Subject: PCI: add an API to get node from vector Next patch will use the API to get the node from vector for nvme device Signed-off-by: Shaohua Li Reviewed-by: Christoph Hellwig Acked-by: Bjorn Helgaas Signed-off-by: Jens Axboe --- drivers/pci/msi.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'drivers/pci') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 980eaf588281..d571bc330686 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1298,6 +1298,22 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) } EXPORT_SYMBOL(pci_irq_get_affinity); +/** + * pci_irq_get_node - return the numa node of a particular msi vector + * @pdev: PCI device to operate on + * @vec: device-relative interrupt vector index (0-based). + */ +int pci_irq_get_node(struct pci_dev *pdev, int vec) +{ + const struct cpumask *mask; + + mask = pci_irq_get_affinity(pdev, vec); + if (mask) + return local_memory_node(cpu_to_node(cpumask_first(mask))); + return dev_to_node(&pdev->dev); +} +EXPORT_SYMBOL(pci_irq_get_node); + struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc) { return to_pci_dev(desc->dev); -- cgit v1.2.3-70-g09d2