diff options
| author | Shaohua Li <shli@fb.com> | 2017-02-01 09:53:15 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-02 08:56:04 -0700 |
| commit | 27ddb689909cd0bab30524a5f720ae3a3e55acac (patch) | |
| tree | 97e6276308d60b3e5087f8de902ba77970dba48c | |
| parent | 59f082e464ae0533813d5a1c3149b22563da93d7 (diff) | |
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>
| -rw-r--r-- | drivers/pci/msi.c | 16 | ||||
| -rw-r--r-- | include/linux/pci.h | 6 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 980eaf588281..d571bc330686 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -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); diff --git a/include/linux/pci.h b/include/linux/pci.h index 282ed32244ce..eb3da1a04e6c 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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 |