diff options
Diffstat (limited to 'drivers/pci/msi/api.c')
| -rw-r--r-- | drivers/pci/msi/api.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c index 2ff2a9ccfc47..83ea38ffa116 100644 --- a/drivers/pci/msi/api.c +++ b/drivers/pci/msi/api.c @@ -60,6 +60,26 @@ void pci_disable_msi(struct pci_dev *dev) EXPORT_SYMBOL(pci_disable_msi); /** + * pci_msix_vec_count() - Get number of MSI-X interrupt vectors on device + * @dev: the PCI device to operate on + * + * Return: number of MSI-X interrupt vectors available on this device + * (i.e., the device's MSI-X capability structure "table size"), -EINVAL + * if the device is not MSI-X capable, other errnos otherwise. + */ +int pci_msix_vec_count(struct pci_dev *dev) +{ + u16 control; + + if (!dev->msix_cap) + return -EINVAL; + + pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control); + return msix_table_size(control); +} +EXPORT_SYMBOL(pci_msix_vec_count); + +/** * pci_enable_msix_range() - Enable MSI-X interrupt mode on device * @dev: the PCI device to operate on * @entries: input/output parameter, array of MSI-X configuration entries |