diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 221b924..f462979 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -28,6 +28,7 @@
  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  */
 
+#include <drmP.h>
 #include <ttm/ttm_module.h>
 #include <ttm/ttm_bo_driver.h>
 #include <ttm/ttm_placement.h>
@@ -110,6 +111,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 			retval = VM_FAULT_NOPAGE;
 			goto out_unlock;
 		default:
+			DRM_ERROR("Driver fault_reserve_notify hook returned %d\n", ret);
 			retval = VM_FAULT_SIGBUS;
 			goto out_unlock;
 		}
@@ -125,6 +127,8 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 		ret = ttm_bo_wait(bo, false, true, false);
 		spin_unlock(&bdev->fence_lock);
 		if (unlikely(ret != 0)) {
+			if (ret != -ERESTARTSYS)
+				DRM_ERROR("ttm_bo_wait returned %d\n", ret);
 			retval = (ret != -ERESTARTSYS) ?
 			    VM_FAULT_SIGBUS : VM_FAULT_NOPAGE;
 			goto out_unlock;
@@ -139,6 +143,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	}
 	ret = ttm_mem_io_reserve_vm(bo);
 	if (unlikely(ret != 0)) {
+		DRM_ERROR("ttm_mem_io_reserve_vm returned %d\n", ret);
 		retval = VM_FAULT_SIGBUS;
 		goto out_io_unlock;
 	}
@@ -149,6 +154,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	    bo->vm_node->start - vma->vm_pgoff;
 
 	if (unlikely(page_offset >= bo->num_pages)) {
+		DRM_ERROR("page_offset=%lu >= bo->num_pages=%lu\n", page_offset, bo->num_pages);
 		retval = VM_FAULT_SIGBUS;
 		goto out_io_unlock;
 	}
@@ -204,6 +210,8 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 		if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
 			break;
 		else if (unlikely(ret != 0)) {
+			if (ret != -ENOMEM)
+				DRM_ERROR("vm_insert_mixed returned %d\n", ret);
 			retval =
 			    (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
 			goto out_io_unlock;