On 07/11/2014 06:00 PM, Ethan Zhao wrote:
> Current implementation of helper function pci_vfs_assigned() is a
> little complex, to get sum of VFs that assigned to VM, access low
> level configuration space register and then loop in traversing
> device tree.
(...)
> @@ -650,6 +630,11 @@ EXPORT_SYMBOL_GPL(pci_vfs_assigned);
> void pci_iov_assign_device(struct pci_dev *pdev)
> {
> pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
> + if (pdev->is_virtfn && !pdev->is_physfn)
> + if (pdev->physfn)
> + if (pdev->physfn->sriov)
Why don't we make last two 'if' conditions into single 'if'
if (pdev->physfn && pdev->physfn->sriov)
> + atomic_inc(&pdev->physfn->sriov->
> + VFs_assigned_cnt);
> }
> EXPORT_SYMBOL_GPL(pci_iov_assign_device);
>
> @@ -660,6 +645,11 @@ EXPORT_SYMBOL_GPL(pci_iov_assign_device);
> void pci_iov_deassign_device(struct pci_dev *pdev)
> {
> pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> + if (pdev->is_virtfn && !pdev->is_physfn)
> + if (pdev->physfn)
> + if (pdev->physfn->sriov)
same...
> + atomic_dec(&pdev->physfn->sriov->
> + VFs_assigned_cnt);
> }
> EXPORT_SYMBOL_GPL(pci_iov_deassign_device);
>
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 6bd0822..d17bda2 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -235,6 +235,7 @@ struct pci_sriov {
> u32 pgsz; /* page size for BAR alignment */
> u8 link; /* Function Dependency Link */
> u16 driver_max_VFs; /* max num VFs driver supports */
> + atomic_t VFs_assigned_cnt; /* counter of VFs assigned to VM */
> struct pci_dev *dev; /* lowest numbered PF */
> struct pci_dev *self; /* this PF */
> struct mutex lock; /* lock for VF bus */
--
Regards,
Varka Bhadram.
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