On Sat, 2013-04-20 at 02:49 -0700, Jeff Kirsher wrote:
> From: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
>
> This function is meant to add a helper function that will determine if a PF
> has any VFs that are currently assigned to a guest. We currently have been
> implementing this function per driver, and going forward I would like to avoid
> that by making this function generic and using this helper.
>
> Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Adding linux-pci mailing list and Bjorn to the CC.
Bjorn- David Miller needs a signoff by PCI maintainer.
> ---
> drivers/pci/iov.c | 41 +++++++++++++++++++++++++++++++++++++++++
> include/linux/pci.h | 5 +++++
> 2 files changed, 46 insertions(+)
>
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index ee599f2..fd99720 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -729,6 +729,47 @@ int pci_num_vf(struct pci_dev *dev)
> EXPORT_SYMBOL_GPL(pci_num_vf);
>
> /**
> + * pci_vfs_assigned - returns number of VFs are assigned to a guest
> + * @dev: the PCI device
> + *
> + * Returns number of VFs belonging to this device that are assigned to a guest.
> + * If device is not a physical function returns -ENODEV.
> + */
> +int pci_vfs_assigned(struct pci_dev *dev)
> +{
> + struct pci_dev *vfdev;
> + unsigned int vfs_assigned = 0;
> + unsigned short dev_id;
> +
> + /* only search if we are a PF */
> + if (!dev->is_physfn)
> + return -ENODEV;
> +
> + /*
> + * determine the device ID for the VFs, the vendor ID will be the
> + * same as the PF so there is no need to check for that one
> + */
> + pci_read_config_word(dev, dev->sriov->pos + PCI_SRIOV_VF_DID, &dev_id);
> +
> + /* loop through all the VFs to see if we own any that are assigned */
> + vfdev = pci_get_device(dev->vendor, dev_id, NULL);
> + while (vfdev) {
> + /*
> + * It is considered assigned if it is a virtual function with
> + * our dev as the physical function and the assigned bit is set
> + */
> + if (vfdev->is_virtfn && (vfdev->physfn == dev) &&
> + (vfdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED))
> + vfs_assigned++;
> +
> + vfdev = pci_get_device(dev->vendor, dev_id, vfdev);
> + }
> +
> + return vfs_assigned;
> +}
> +EXPORT_SYMBOL_GPL(pci_vfs_assigned);
> +
> +/**
> * pci_sriov_set_totalvfs -- reduce the TotalVFs available
> * @dev: the PCI PF device
> * @numvfs: number that should be used for TotalVFs supported
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 2461033a..03b4d3c 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1643,6 +1643,7 @@ extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
> extern void pci_disable_sriov(struct pci_dev *dev);
> extern irqreturn_t pci_sriov_migration(struct pci_dev *dev);
> extern int pci_num_vf(struct pci_dev *dev);
> +extern int pci_vfs_assigned(struct pci_dev *dev);
> extern int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
> extern int pci_sriov_get_totalvfs(struct pci_dev *dev);
> #else
> @@ -1661,6 +1662,10 @@ static inline int pci_num_vf(struct pci_dev *dev)
> {
> return 0;
> }
> +static inline int pci_vfs_assigned(struct pci_dev *dev)
> +{
> + return 0;
> +}
> static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
> {
> return 0;
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