PCI: Add pcibios_sriov_enable() and pcibios_sriov_disable()
VFs are dynamically created when a driver enables them. On some platforms,
like PowerNV, special resources are necessary to enable VFs.
Add platform hooks for enabling and disabling VFs.
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 5643a10..64c4692 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -220,6 +220,11 @@
pci_dev_put(dev);
}
+int __weak pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
+{
+ return 0;
+}
+
static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
{
int rc;
@@ -231,6 +236,7 @@
struct pci_sriov *iov = dev->sriov;
int bars = 0;
int bus;
+ int retval;
if (!nr_virtfn)
return 0;
@@ -307,6 +313,12 @@
if (nr_virtfn < initial)
initial = nr_virtfn;
+ if ((retval = pcibios_sriov_enable(dev, initial))) {
+ 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)
@@ -335,6 +347,11 @@
return rc;
}
+int __weak pcibios_sriov_disable(struct pci_dev *pdev)
+{
+ return 0;
+}
+
static void sriov_disable(struct pci_dev *dev)
{
int i;
@@ -346,6 +363,8 @@
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);