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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>
This commit is contained in:
Shaohua Li 2017-02-01 09:53:15 -08:00 committed by Jens Axboe
parent 59f082e464
commit 27ddb68990
2 changed files with 22 additions and 0 deletions
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16
drivers/pci/msi.c
View File

@ -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);

6
include/linux/pci.h
View File

@ -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