[PATCH V2 2/3] PCI: add an API to get node from vector

[Shaohua Li]

Next patch will use the API to get the node from vector for nvme device

Signed-off-by: Shaohua Li <s...@fb.com>
---
 drivers/pci/msi.c   | 16 ++++++++++++++++
 include/linux/pci.h |  6 ++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 50c5003..ab7aee7 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1313,6 +1313,22 @@ 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);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e2d1a12..df2c649 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1334,6 +1334,7 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, 
unsigned int min_vecs,
 void pci_free_irq_vectors(struct pci_dev *dev);
 int pci_irq_vector(struct pci_dev *dev, unsigned int nr);
 const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, int vec);
+int pci_irq_get_node(struct pci_dev *pdev, int vec);
 
 #else
 static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
@@ -1384,6 +1385,11 @@ static inline const struct cpumask 
*pci_irq_get_affinity(struct pci_dev *pdev,
 {
        return cpu_possible_mask;
 }
+
+static inline int pci_irq_get_node(struct pci_dev *pdev, int vec)
+{
+       return first_online_node;
+}
 #endif
 
 static inline int
-- 
2.9.3