Add support to enable and disable TPH function with
mode selection.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 drivers/vfio/pci/vfio_pci_core.c | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 35df624439a3..0f96b41779cd 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -1493,6 +1493,37 @@ static int vfio_pci_tph_get_cap(struct vfio_pci_core_device *vdev,
 #endif
 }
 
+static int vfio_pci_tph_enable(struct vfio_pci_core_device *vdev,
+			      struct vfio_device_pci_tph_op *op,
+			      void __user *uarg)
+{
+	struct vfio_pci_tph_ctrl ctrl;
+	int mode;
+
+	if (op->argsz < offsetofend(struct vfio_device_pci_tph_op, ctrl))
+		return -EINVAL;
+
+	if (copy_from_user(&ctrl, uarg, sizeof(ctrl)))
+		return -EFAULT;
+
+	if (ctrl.mode != VFIO_PCI_TPH_MODE_IV && ctrl.mode != VFIO_PCI_TPH_MODE_DS)
+		return -EINVAL;
+
+	/* Reserved must be zero */
+	if (memchr_inv(ctrl.reserved, 0, sizeof(ctrl.reserved)))
+		return -EINVAL;
+
+	mode = (ctrl.mode == VFIO_PCI_TPH_MODE_IV) ? PCI_TPH_ST_IV_MODE :
+						     PCI_TPH_ST_DS_MODE;
+	return pcie_enable_tph(vdev->pdev, mode);
+}
+
+static int vfio_pci_tph_disable(struct vfio_pci_core_device *vdev)
+{
+	pcie_disable_tph(vdev->pdev);
+	return 0;
+}
+
 static int vfio_pci_ioctl_tph(struct vfio_pci_core_device *vdev,
 			      void __user *uarg)
 {
@@ -1509,6 +1540,10 @@ static int vfio_pci_ioctl_tph(struct vfio_pci_core_device *vdev,
 	switch (op.op) {
 	case VFIO_PCI_TPH_GET_CAP:
 		return vfio_pci_tph_get_cap(vdev, &op, uarg + minsz);
+	case VFIO_PCI_TPH_ENABLE:
+		return vfio_pci_tph_enable(vdev, &op, uarg + minsz);
+	case VFIO_PCI_TPH_DISABLE:
+		return vfio_pci_tph_disable(vdev);
 	default:
 		/* Other ops are not implemented yet */
 		return -EINVAL;
-- 
2.17.1