Add support to batch program Steering Tag table entries
for standard TPH modes.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 drivers/vfio/pci/vfio_pci_core.c | 51 ++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 3fe8a48b1cc0..a3146056397a 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -1573,6 +1573,55 @@ static int vfio_pci_tph_get_st(struct vfio_pci_core_device *vdev,
 	return err;
 }
 
+static int vfio_pci_tph_set_st(struct vfio_pci_core_device *vdev,
+			       struct vfio_device_pci_tph_op *op,
+			       void __user *uarg)
+{
+	struct vfio_pci_tph_entry *ents;
+	struct vfio_pci_tph_st st;
+	enum tph_mem_type mtype;
+	int i, err, size;
+	u16 st_val;
+
+	if (copy_from_user(&st, uarg, sizeof(st)))
+		return -EFAULT;
+
+	if (!st.count || st.count > 2048)
+		return -EINVAL;
+
+	size = st.count * sizeof(*ents);
+	ents = kvmalloc(size, GFP_KERNEL);
+	if (!ents)
+		return -ENOMEM;
+
+	if (copy_from_user(ents, uarg + sizeof(st), size)) {
+		err = -EFAULT;
+		goto out;
+	}
+
+	for (i = 0; i < st.count; i++) {
+		if (ents[i].mem_type == VFIO_PCI_TPH_MEM_TYPE_VM) {
+			mtype = TPH_MEM_TYPE_VM;
+		} else if (ents[i].mem_type == VFIO_PCI_TPH_MEM_TYPE_PM) {
+			mtype = TPH_MEM_TYPE_PM;
+		} else {
+			err = -EINVAL;
+			goto out;
+		}
+
+		err = pcie_tph_get_cpu_st(vdev->pdev, mtype, ents[i].cpu, &st_val);
+		if (err)
+			goto out;
+		err = pcie_tph_set_st_entry(vdev->pdev, ents[i].index, st_val);
+		if (err)
+			goto out;
+	}
+
+out:
+	kvfree(ents);
+	return err;
+}
+
 static int vfio_pci_ioctl_tph(struct vfio_pci_core_device *vdev,
 			      void __user *uarg)
 {
@@ -1595,6 +1644,8 @@ static int vfio_pci_ioctl_tph(struct vfio_pci_core_device *vdev,
 		return vfio_pci_tph_disable(vdev);
 	case VFIO_PCI_TPH_GET_ST:
 		return vfio_pci_tph_get_st(vdev, &op, uarg + minsz);
+	case VFIO_PCI_TPH_SET_ST:
+		return vfio_pci_tph_set_st(vdev, &op, uarg + minsz);
 	default:
 		/* Other ops are not implemented yet */
 		return -EINVAL;
-- 
2.17.1