On Tue, Jun 10, 2014 at 09:56:26AM +0800, Wei Yang wrote:
>VFs are dynamically created/released when driver enable them. On some
>platforms, like PowerNV, special resources are necessary to enable VFs.
>
>This patch adds two hooks for platform initialization before creating the VFs.
>
>Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx>
>---
> drivers/pci/iov.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
>diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
>index 1d21f43..cc87773 100644
>--- a/drivers/pci/iov.c
>+++ b/drivers/pci/iov.c
>@@ -250,6 +250,11 @@ static void sriov_disable_migration(struct pci_dev *dev)
> iounmap(iov->mstate);
> }
>
>+int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 vf_num)
>+{
>+ return 0;
>+}
>+
> static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> {
> int rc;
>@@ -260,6 +265,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> struct pci_dev *pdev;
> struct pci_sriov *iov = dev->sriov;
> int bars = 0;
>+ int retval;
>
> if (!nr_virtfn)
> return 0;
>@@ -334,6 +340,12 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> if (nr_virtfn < initial)
> initial = nr_virtfn;
>
>+ if ((retval = pcibios_sriov_enable(dev, initial))) {
>+ dev_err(&dev->dev, "Failure %d from pcibios_sriov_setup()\n",
>+ retval);
dev_err(&dev->dev, "Failure %d from pcibios_sriov_enable()\n",
retval);
>+ return retval;
>+ }
>+
> for (i = 0; i < initial; i++) {
> rc = virtfn_add(dev, i, 0);
> if (rc)
>@@ -368,6 +380,11 @@ failed:
> return rc;
> }
>
>+int __weak pcibios_sriov_disable(struct pci_dev *pdev)
>+{
>+ return 0;
>+}
>+
> static void sriov_disable(struct pci_dev *dev)
> {
> int i;
>@@ -382,6 +399,8 @@ static void sriov_disable(struct pci_dev *dev)
> for (i = 0; i < iov->num_VFs; i++)
> virtfn_remove(dev, i, 0);
>
>+ pcibios_sriov_disable(dev);
>+
> iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
> pci_cfg_access_lock(dev);
> pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
Thanks,
Gavin
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