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authorTiwei Bie <tiwei.bie@intel.com>2018-06-01 12:02:39 +0800
committerMichael S. Tsirkin <mst@redhat.com>2018-06-12 04:59:29 +0300
commitcfecc2918d2b3c5e86ff1a6c95eabbbb17bb8fd3 (patch)
treee1d6119d7345b602e538f1eb6be11ad432e4ee3c /drivers/virtio
parent670ae9caaca467ea1bfd325cb2a5c98ba87f94ad (diff)
downloadlinux-cfecc2918d2b3c5e86ff1a6c95eabbbb17bb8fd3.tar.bz2
virtio_pci: support enabling VFs
There is a new feature bit allocated in virtio spec to support SR-IOV (Single Root I/O Virtualization): https://github.com/oasis-tcs/virtio-spec/issues/11 This patch enables the support for this feature bit in virtio driver. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_pci_common.c30
-rw-r--r--drivers/virtio/virtio_pci_modern.c14
2 files changed, 44 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 48d4d1cf1cb6..1d4467b2dc31 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -577,6 +577,8 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct device *dev = get_device(&vp_dev->vdev.dev);
+ pci_disable_sriov(pci_dev);
+
unregister_virtio_device(&vp_dev->vdev);
if (vp_dev->ioaddr)
@@ -588,6 +590,33 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
put_device(dev);
}
+static int virtio_pci_sriov_configure(struct pci_dev *pci_dev, int num_vfs)
+{
+ struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
+ struct virtio_device *vdev = &vp_dev->vdev;
+ int ret;
+
+ if (!(vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_DRIVER_OK))
+ return -EBUSY;
+
+ if (!__virtio_test_bit(vdev, VIRTIO_F_SR_IOV))
+ return -EINVAL;
+
+ if (pci_vfs_assigned(pci_dev))
+ return -EPERM;
+
+ if (num_vfs == 0) {
+ pci_disable_sriov(pci_dev);
+ return 0;
+ }
+
+ ret = pci_enable_sriov(pci_dev, num_vfs);
+ if (ret < 0)
+ return ret;
+
+ return num_vfs;
+}
+
static struct pci_driver virtio_pci_driver = {
.name = "virtio-pci",
.id_table = virtio_pci_id_table,
@@ -596,6 +625,7 @@ static struct pci_driver virtio_pci_driver = {
#ifdef CONFIG_PM_SLEEP
.driver.pm = &virtio_pci_pm_ops,
#endif
+ .sriov_configure = virtio_pci_sriov_configure,
};
module_pci_driver(virtio_pci_driver);
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 2555d80f6eec..07571daccfec 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -153,14 +153,28 @@ static u64 vp_get_features(struct virtio_device *vdev)
return features;
}
+static void vp_transport_features(struct virtio_device *vdev, u64 features)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ struct pci_dev *pci_dev = vp_dev->pci_dev;
+
+ if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
+ pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
+ __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
+}
+
/* virtio config->finalize_features() implementation */
static int vp_finalize_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ u64 features = vdev->features;
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
+ /* Give virtio_pci a chance to accept features. */
+ vp_transport_features(vdev, features);
+
if (!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
dev_err(&vdev->dev, "virtio: device uses modern interface "
"but does not have VIRTIO_F_VERSION_1\n");