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

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Message-ID: <d0f9b1bda8c27f058c95f88015e013b9d8131dc0.1485971427.git.shli@fb.com>
Date:   Wed, 1 Feb 2017 09:53:15 -0800
From:   Shaohua Li <shli@...com>
To:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>
CC:     <bhelgaas@...gle.com>, <hch@....de>, <axboe@...com>
Subject: [PATCH V2 2/3] 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@...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