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Commit 27ddb689 authored by Shaohua Li's avatar Shaohua Li Committed by Jens Axboe
Browse files

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: default avatarShaohua Li <shli@fb.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 59f082e4

drivers/pci/msi.c

+16 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/pci.h

+6 −0
Original line number Diff line number Diff line
@@ -1323,6 +1323,7 @@ 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; }
@@ -1370,6 +1371,11 @@ 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