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PCI: Add pcibios_sriov_enable() and pcibios_sriov_disable()

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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>
This commit is contained in:
Wei Yang 2015-03-25 16:23:49 +08:00 committed by Benjamin Herrenschmidt
parent b07579c092
commit 995df527f3
1 changed files with 19 additions and 0 deletions
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19
drivers/pci/iov.c
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@ -220,6 +220,11 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset)
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 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
struct pci_sriov *iov = dev->sriov;
int bars = 0;
int bus;
int retval;
if (!nr_virtfn)
return 0;
@ -307,6 +313,12 @@ 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_enable()\n",
retval);
return retval;
}
for (i = 0; i < initial; i++) {
rc = virtfn_add(dev, i, 0);
if (rc)
@ -335,6 +347,11 @@ failed:
return rc;
}
int __weak pcibios_sriov_disable(struct pci_dev *pdev)
{
return 0;
}
static void sriov_disable(struct pci_dev *dev)
{
int i;
@ -346,6 +363,8 @@ 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);