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);
+ 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);
--
1.7.9.5
--
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