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authorShaohua Li <shli@fb.com>2017-02-01 09:53:15 -0800
committerJens Axboe <axboe@fb.com>2017-03-02 08:56:04 -0700
commit27ddb689909cd0bab30524a5f720ae3a3e55acac (patch)
tree97e6276308d60b3e5087f8de902ba77970dba48c /drivers/pci/msi.c
parent59f082e464ae0533813d5a1c3149b22563da93d7 (diff)
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 <shli@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c16
1 files changed, 16 insertions, 0 deletions
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);