diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/iov.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 0267977c9f17..952217572113 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -33,6 +33,49 @@ int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id) } EXPORT_SYMBOL_GPL(pci_iov_virtfn_devfn); +int pci_iov_vf_id(struct pci_dev *dev) +{ + struct pci_dev *pf; + + if (!dev->is_virtfn) + return -EINVAL; + + pf = pci_physfn(dev); + return (((dev->bus->number << 8) + dev->devfn) - + ((pf->bus->number << 8) + pf->devfn + pf->sriov->offset)) / + pf->sriov->stride; +} +EXPORT_SYMBOL_GPL(pci_iov_vf_id); + +/** + * pci_iov_get_pf_drvdata - Return the drvdata of a PF + * @dev: VF pci_dev + * @pf_driver: Device driver required to own the PF + * + * This must be called from a context that ensures that a VF driver is attached. + * The value returned is invalid once the VF driver completes its remove() + * callback. + * + * Locking is achieved by the driver core. A VF driver cannot be probed until + * pci_enable_sriov() is called and pci_disable_sriov() does not return until + * all VF drivers have completed their remove(). + * + * The PF driver must call pci_disable_sriov() before it begins to destroy the + * drvdata. + */ +void *pci_iov_get_pf_drvdata(struct pci_dev *dev, struct pci_driver *pf_driver) +{ + struct pci_dev *pf_dev; + + if (!dev->is_virtfn) + return ERR_PTR(-EINVAL); + pf_dev = dev->physfn; + if (pf_dev->driver != pf_driver) + return ERR_PTR(-EINVAL); + return pci_get_drvdata(pf_dev); +} +EXPORT_SYMBOL_GPL(pci_iov_get_pf_drvdata); + /* * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may * change when NumVFs changes. |