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Subject[PATCH V2 2/3] PCI: add an API to get node from vector
Date
Next patch will use the API to get the node from vector for nvme device

Signed-off-by: Shaohua Li <shli@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
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