From: David Woodhouse <dwmw@xxxxxxxxxxxx>
Allow userspace to configure SR-IOV VFs through sysfs.
Currently, we need an in-kernel driver to permit this. But sometimes
*all* we want to do is enable the VFs so that we can assign them to
guests; we don't actually need to deal with the PF in any other way
from the host kernel. So let's make it possible to use UIO for that.
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
It's not entirely clear to me why we require the driver to "enable"
SR-IOV like this anyway — were there some which needed to do something
special and device-specific instead of just falling through to
pci_{en,dis}able_sriov(), such that we need to effectively whitelist
this in the driver rather than blacklisting the "problematic" ones via
PCI quirks?
drivers/uio/uio_pci_generic.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index a56fdf9..bd196f0 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -108,15 +108,27 @@ static void remove(struct pci_dev *pdev)
struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev);
uio_unregister_device(&gdev->info);
+ pci_disable_sriov(pdev);
pci_disable_device(pdev);
kfree(gdev);
}
+static int sriov_configure(struct pci_dev *pdev, int num_vfs)
+{
+ if (!num_vfs) {
+ pci_disable_sriov(pdev);
+ return 0;
+ }
+
+ return pci_enable_sriov(pdev, num_vfs);
+}
+
static struct pci_driver uio_pci_driver = {
.name = "uio_pci_generic",
.id_table = NULL, /* only dynamic id's */
.probe = probe,
.remove = remove,
+ .sriov_configure = sriov_configure,
};
module_pci_driver(uio_pci_driver);
--
2.7.4
--
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